Cardboard with low bulk density

FIELD: textiles, paper.

SUBSTANCE: cardboard comprises solid cardboard substrate of bleached sulphate pulp (BSP) and a coating applied to the cardboard substrate to form a coated structure. The said coated structure has a surface density, thickness of the sheet and the Parker surface smoothness. The Parker surface smoothness is at most about 3 microns, and the surface density is at most about Y2 or Y3 or Y4 pound/3000 foot2, where Y2, Y3 and Y4 are functions of the said thickness (X) of the sheet in points which are calculated using the equation: Y2=3.71+13.14X-0.1602X2 or Y3=3.63+12.85X-0.1566X2, or Y4=3.50+12.41X-0.1513X2.

EFFECT: invention provides a coated cardboard with increased smoothness with the required parameters of thickness and the surface density to ensure high-quality printing.

13 cl, 10 dwg, 1 tbl, 6 ex

 

Background of invention

This patent application is aimed at creating cardboard with low bulk density, and more specifically on the creation of cardboard with low bulk density and a smooth surface.

Cardboard is usually used for the manufacture of various packages. For example, aseptic carton for packaging liquids used for the manufacture of containers, boxes, etc. for packaging beverages. In this case, buyers often prefer cardboard, having, in General, a smooth surface with a small amount of defects to ensure high quality printing of text and graphics, to increase, thus, the external attractiveness of the products, Packed in cardboard.

Usually smooth cardboard ensure by means of calendering wet paper pulp, in which the cardboard re-moisten and passed through a calender containing two or more hard shaft. In the calendering process of wet paper pulp paperboard smooth by pressing fibrous mesh structure to eliminate holes and gaps in a damp cardboard. For this reason, smooth cardboard is usually more dense (i.e. less volume)than less smooth cardboard.

For example, figure 1 shows the chart of the ratio of surface density (lb/stop paper) (1 stop b the sorcerers = 3000 ft 2) and thickness (sheet) (1 point = 0.001 inch = 0,0254 mm) certain known analogues whole cartons of bleached sulfate pulp (oscs), giving a visual representation about bulk density (i.e. the surface density divided by the thickness) is known analogues of cardboard. As you can see, the point on the chart, in General, fall within the range between the curve R1and the curve R2. Cardboard with a lower bulk density (i.e. cardboard, fall into the area below the curve R1), especially cardboard with low bulk density, which has a smooth surface, among the analogs are not met.

However, small bulk density is a desirable quality in many cases, the use of cardboard. However, for the manufacture of smooth cardboard using conventional calendering process of wet paper pulp requires a substantial increase in bulk density cardboard.

Accordingly, there is a need in the cardboard with a low bulk density and with the required smoothness to ensure high quality printing, at a reduced cost of manufacturing such a Board.

Disclosure of inventions

According to one aspect of the invention disclosed cardboard with low bulk density may contain fibrous substrate and a coating on a fibrous substrate to obtain the structure of pokrytie, where the structure is coated has: surface smoothness by Parker, component of at most about 3 microns; the thickness of the sheet; and surface density, where the surface density is at most about Y1where Y1is a function of the thickness (X) of the sheet in points and is calculated using equation 1:

Y1=3,79+13,43X-0,1638X2(1)

According to another aspect of the invention disclosed cardboard with low bulk density may contain fibrous substrate and a coating on a fibrous substrate to obtain a structure with a floor, where the structure is coated has: surface smoothness by Parker, component, at most about 3 microns; the thickness of the sheet and the surface density, where the surface density is at most about Y2where Y2is a function of the thickness (X) of the sheet in points and is calculated using equation 2:

Y2=3,71+13,14X-0,1602X2(2)

According to another aspect of the invention disclosed cardboard with low bulk density may contain fibrous substrate and a coating on a fibrous substrate to obtain a structure with a floor, where the structure is coated has: surface smoothness by Parker, component, at most about 3 microns; the thickness of the sheet and the surface density surface where PL is tnost is, at most, about Y3where Y3is a function of the thickness (X) of the sheet in points and is calculated using equation 3:

Y3=3,63+12,85X-0,1566X2(3)

According to another aspect of the invention disclosed cardboard with low bulk density may contain fibrous substrate and a coating on a fibrous substrate to obtain a structure with a floor, where the structure is coated has: surface smoothness by Parker, component, at most about 3 microns; the thickness of the sheet and the surface density, where the surface density is at most about Y4where Y4is a function of the thickness (X) of the sheet in points and is calculated using equation 4:

Y4=3,50+12,41X-0,1513X2(4)

According to another aspect of the invention disclosed cardboard with low bulk density may contain: fibrous substrate, the coating and the coating is located between the fibrous substrate and the upper surface, where the fibrous substrate, a primer coating and top coating form a structure with a floor, where the structure is coated has: surface smoothness by Parker, component, at most about 3 microns; the thickness of the sheet and the surface density, where the surface density is at most about Y5where Y5is a function of the masses of the HN (X) of the sheet in points and it is calculated using equation 5:

Y5=3,30+11,68X-0,1424X2(5)

According to another aspect of the invention disclosed cardboard with low bulk density may contain: fibrous substrate and a coating on a fibrous substrate to obtain a structure with a floor, where the structure is coated has: surface smoothness by Parker, component, at most about 3 microns; the thickness of the sheet and the surface density, where the surface density is at most about Y1'where Y1' is a function of the thickness (X) of the sheet in points and is calculated using equation 6:

Y1'=36,26+8,342X+0,01629X2(6)

According to another aspect of the invention disclosed cardboard with low bulk density may contain: fibrous substrate and a coating on a fibrous substrate to obtain a structure with a floor, where the structure is coated has: surface smoothness by Parker, component, at most about 3 microns; the thickness of the sheet and the surface density, where the surface density is at most about Y2'where Y2' is a function of the thickness (X) of the sheet in points and is calculated using equation 7:

Y2'=35,55+8,173X+0,01602X2(7)

According to another aspect of the invention disclosed cardboard with low bulk density m which may contain: fibrous substrate and the coating, deposited on the fibrous substrate to obtain a structure with a floor, where the structure is coated has: surface smoothness by Parker, component, at most about 3 microns; the thickness of the sheet and the surface density, where the surface density is at most about Y3'where Y3' is a function of the thickness (X) of the sheet in points and is calculated using equation 8:

Y3'=34,83+8,010X+0,01570X2(8)

According to another aspect of the invention disclosed cardboard with low bulk density may contain: fibrous substrate and a coating on a fibrous substrate to obtain a structure with a floor, where the structure is coated has: surface smoothness by Parker, component, at most about 3 microns; the thickness of the sheet and the surface density, where the surface density is at most about Y4'where Y4' is a function of the thickness (X) of the sheet in points and is calculated using equation 9:

Y4'=33,79+7,769X+0,01524X2(9)

According to another aspect of the invention disclosed cardboard with low bulk density may contain: fibrous substrate, the coating and the coating is located between the fibrous substrate and the upper surface, where the fibrous substrate, a primer coating and top coating form p is the established levels with the floor, where the structure is coated has: surface smoothness by Parker, component, at most about 3 microns; the thickness of the sheet and the surface density, where the surface density is at most about Y5'where Y5' is a function of the thickness (X) of the sheet in points and is calculated using equation 10:

Y5'=32,77+7,537X+0,01475X2(10)

Other aspects of the disclosed paperboard with low bulk density will become apparent after reading the subsequent description, the accompanying drawings and claims.

Brief description of drawings

Figure 1 shows the chart of the ratio of surface density and thickness of the sheet defined cardboard materials prior art;

figure 2 is a cross section of the open carton with low bulk density according to one aspect of the invention;

figure 3 - chart of the ratio of surface density and thickness of a sheet of open cartons with low bulk density according to different given as examples of aspects of the invention;

figure 4 - schematic illustration of the technological process of manufacturing of the open carton with low bulk density according to the first aspect of the invention;

figure 5 - schematic illustration of the technological process of manufacturing of the open carton is low bulk density according to the second aspect of the invention;

figure 6 is a chart of the ratio of bulk density and thickness of a sheet of open cartons with low bulk density according to different given as examples of aspects of the invention;

7 is a chart of the ratio of bulk density and surface smoothness of the Parker unveiled cardboard with low bulk density, having a sheet thickness of about 10 points, according to an example aspect of the invention;

on Fig - chart of the ratio of bulk density and surface smoothness of the Parker open cartons with low bulk density, having a sheet thickness of about 12 points, according to different given as examples of aspects of the invention;

figure 9 is a chart of the ratio of bulk density and surface smoothness of the Parker open cartons with low bulk density, having a sheet thickness of about 18 points, according to different given as examples of aspects of the invention; and

figure 10 is another graph of the ratio of surface density and thickness according to different given as examples of aspects of the invention presented in figure 3.

Detailed description of the invention

Open the cardboard with low bulk density according to one aspect of the invention, generally indicated by the position 10 (see figure 2), containing the ü fibrous substrate 12, primer coating 14 and top cover 16. The carton 10 may have a plate thickness T and the upper surface S, which can be printed with text or graphics. Can be used for additional layers without deviation from the scope of the present invention.

According to one aspect of the invention the fibrous substrate 12 may be a substrate of cardboard. The term "substrate cardboard" when used in this description, in General, understand any cardboard that can be coated with a primer coating and can be a single-layer substrate or a multilayer substrate. Specialists in the art should be understood that the substrate cardboard can be bleached or unbleached and usually it is thicker and more rigid than paper. Typically, the substrate cardboard has a surface density in the state without covering approximately 85 lb/3000 ft2(138,34 g/m2) or more. Examples of appropriate substrates cartons include a wavy middle layer, flat cardboard and one-piece paperboard of bleached sulfate pulp (oscs). The fibrous substrate 12 according to one particular aspect of the invention may contain essentially chemically (but not mechanically) treated fiber, for example essentially 100% chemically treated fiber. Examples of appropriate substrates 12 of helices and processed fiber include whole paperboard of bleached sulfate pulp or solid paperboard of unbleached sulphate pulp.

Additional components, such as: binders, fillers, pigments, etc. can be added to the fibrous substrate 12 without deviation from the scope of the present invention. In addition, the fibrous substrate 12 is essentially not contain plastic pigments to increase the volume, for example, hollow plastic pigments, or expanding microspheres, or other chemicals that are causing the increase. In addition, the fibrous substrate 12 is essentially not contain comminuted wood particles.

The upper floor 16 is an optional layer, and it can be any of the respective upper floor. For example, the coating 16 may include calcium carbonate, clay, and various other components, and it can be applied on the primer coating 14 in the form of a suspension. The top coating is well known to experts in the art, and any conventional or unconventional top coating 16 may be used without deviation from the scope of the present invention.

Primer coating 14 and top cover 16 can be any coating that improves the smoothness of the surface S of the carton 10 without substantial reduction of the thickness T of the carton 10, providing, thus, a smooth (for example, surface smoothness by Parker, less than CA is approximately 3.0 mm) cardboard with low bulk density. Specialists in the art should be understood that the primer coating 14, as well as technology (discussed below) applying a primer coating 14 on the fibrous substrate 12 may be significant factors to maintain a low bulk density product.

According to the first aspect of the invention a primer coating 14 may be carbonate-clay primer coating. Carbonate-clay primer coating may contain a component of crushed calcium carbonate component, clay lamellar structure and a variety of optional components, such as latex binders, thickeners, etc. of Carbonate-clay primer coating can be atomized in water, so that it can be applied to the fibrous substrate 12 in the form of a suspension, using, for example, the doctor blade so that the carbonate-clay primer coating essentially filled the hollows and gaps in the fibrous substrate 12 without substantially covering the entire surface of the fibrous substrate 12.

Ground calcium carbonate may be calcium carbonate coarse, for example, the brand CARBITAL® 60, available from Imerys Pigments, Inc. (USA, pieces of Georgia, Roswell), or calcium carbonate is very coarse, for example, the brand CARBITAL® 35, is also available for prio is retene from Imerys Pigments, Inc. Clay lamellar structure can be clay, with a high value of the shape factor (i.e. the ratio of the length or diameter of the particles of the clay to its thickness equal to an average of about 50:1, for example, the brand CONTOUR® 1180, available from Imerys Pigments, Inc., or clay with a very high value of the shape factor, amounting to an average of about 90:1, for example, the brand XP-6100 (also known as BARRISURF X), also available for purchase from Imerys Pigments, Inc.

Specific examples of the respective carbonate-clay primer coatings and application techniques such primer coatings on fibrous substrate 12, disclosed in the application US No. 61/038,579, filed on March 21, 2008, the contents of which fully incorporated into the present application by reference.

Accordingly, according to one aspect of the invention, the carton 10 with low bulk density can be produced using the process 20, is illustrated in figure 4. Process 20 may begin with the use of the headbox 22, from which the fibrous suspension can be produced on clinocerinae forming device 24 for forming the paper web 26. The paper web 26 may be passed through one or more wet presses 28 and, optionally, through one or more drying units 30. You can use CL the ilen press 32, and with its help it is possible to decrease the thickness of the paper web 26, and with optional dryer 34 can optionally drying the paper web 26. According to one aspect of the invention the paper web 26 may be passed through a calender 36, in which the contact load is significantly reduced to reduce to a minimum or avoid reducing the thickness of the paper web. Preferably, the calender 36 worked as the dry calender. According to another aspect of the invention, the calender 36 may be eliminated or bypassed. Then the paper web 26 may be passed through another optional dryer 38 and directed to the first device 40 for applying the coating. The first device 40 for applying the coating may be a device containing the doctor blade or similar device, and with its help you can apply carbonate-clay primer coating 14 on the paper web 26. With optional dryer 42 carbonate-clay primer coating 14 may be dried, at least partially, before applying the optional top coating 16 on the second device 44 for coating. Using another optional dryer 46 the drying process can be completed before submitting the paper web 26 in optional glazing calender 48, after which the paper web 26 is delivered in a roll in Namat the state of the device 50.

According to the second aspect of the invention a primer coating 14 may be a solution film-forming polymer, applied to the fibrous substrate 12, and then introduced into contact with the heated surface in the contact zone, which causes boiling of the solution and the formation of cavities in the film which remains after drying the film, resulting in a smooth surface. Film-forming polymer may be a starch, and a heated surface can serve as the heated shaft.

Specific examples of the respective film-forming polymers, as well as application techniques such polymers in fibrous substrate, disclosed in application PCT/US07/04742, filed February 22, 2007, the contents of which fully incorporated into the present application by reference; application US No. 60/957,478, filed on 23 August 2007, the contents of which fully incorporated into the present application by reference; and in the application PCT/US07/19917, filed September 13, 2007, the contents of which fully incorporated into the present application by reference.

Accordingly, according to another aspect of the invention, the carton 10 with low bulk density can be produced using the process 60, illustrated in figure 5. The process 60 may begin with the use of the headbox 62, from which the fibrous suspension can be produced on linnasetehase device 64 for forming the paper web 66. The paper web 66 may be passed through one or more wet presses 68 and, optionally, through one or more of the dryer 70. You can use the size press 72, and with its help it is possible to decrease the thickness of the paper web 66, and with optional dryer 74 can optionally drying the paper web 66. According to one aspect of the invention the paper web 66 can pass through the calender 76, in which the contact load is significantly reduced to reduce to a minimum or avoid reducing the thickness of the paper web. The calender 76, if used, can work as the dry calender. According to another aspect of the invention, the calender 76 may be eliminated or bypassed. Then the paper web 66 can be sent to the device 78 for applying film-forming polymer, followed by processing in the area of contact of the heated shaft 80 and the pressing roller for forming a smooth surface with cavities in the polymeric film. After applying the film-forming polymer and processing using heat and pressure to the paper web 66 may be passed through another optional dryer 82 and sent to the first device 84 for coating. The first device 84 for applying the coating may be a device containing the doctor blade or similar device, and this can be applied a conventional primer coating (for example, the second primer coating on the paper web 66 with a starch coating. You can use an optional dryer 86 for at least partial drying of the primer coating before applying the optional top coating on the second device 88 for coating. Using another optional dryer 90 drying process can be completed before submitting the paper web 66 in optional glazing calender 92, after which the paper web 66 delivered in a roll in the winding device 94. The glazing calender 92 may be a calender with soft contact, hard contact zone, or it may be eliminated or bypassed.

Here, experts in the art it should be clear that using the primer 14, the top coating 16 and the associated coating technologies disclosed above, it is possible to improve the smoothness of the resulting carton 10, at the same time, essentially keeping the thickness of the fibrous substrate 12 in the entire coating process.

Examples

Specific examples of smooth cardboard with low bulk density, made according to the present invention, is presented below.

Example 1

Made of solid paperboard uncoated bleached sulfate pulp (oscs) with low bulk density, weighing about 120 lbs/300 ft 2(195,60 g/m2using full-scale production process.

Prepared high volume of carbonate-clay primer coating of the following composition: (1) 50 parts of clay with a high value of the shape factor of the particles from Imerys Pigments, Inc.; (2) 50 parts of PG-3 from the company Omya (calcium carbonate very coarse); (3) 19 parts polyvinyl acetate latex (binder); and (4) synthetic thickener, swelling under the influence of alkali in a quantity sufficient to increase the viscosity of the mixture to 2500 CPS (at 20 rpm, measured at viscosimeter of Brookfield.

Prepared top coat of the following composition: 50 parts of finely ground carbonate; 50 parts of finely ground clay; 17 parts of polyvinyl acetate; and minor amounts of opaque sizing, plastic pigment, protein, dispersant, synthetic viscosity modifier, defoamer and a colorant.

Primer coating was applied to the paperboard uncoated, using the device for coating the tape doctor blade, tilted along the paper web. Primer coating was applied so that the surface of the paper web remained minimal amount of primer coating required to fill the cavities in the roughness of the paper web, at the same time scouring the gives the key a primer coating to the paper web, there is a minimal amount of primer coating above the plane of the fibrous surface. Primer coating was applied with a surface density of the coating layer of about 6.0 lb/3000 ft2(9,78 g/m2). On top of the primer coating was applied a top coat to further improve the smoothness of the surface. The top coating was applied with surface coverage density of about 5.4 lbs/3000 ft2(8.8 g/m2).

The resulting structure with the coating had a total surface density of about 130,0 lb/3000 ft2(211,9 g/m2), a thickness of about 0.012 inch (12 point.) (0.3 mm) and surface smoothness 10S by Parker about 1.5 microns.

Example 2

Paperboard uncoated with low bulk density weighing about 186,8 lb/3000 ft2(304,48 g/m2) were made by using a pilot production process.

Prepared the first primer coating of the following composition: suspension containing 17 wt.% solids, comprising 97 wt.% low molecular weight ethylene starch and 3 wt.% antiadhesive based on soybean oil. The suspension was applied onto the surface of the paperboard uncoated surface coverage density of about 2.7 lbs/3000 ft2(4.4 g/m2) Treated cardboard was then put in contact with a polished drum temperature is Oh about 430°F (221,11°C) and at a pressure of about 200 lbs/shoulder strap. inch (3571,57 kg/RM), thus bringing to a boil starch and giving the surface of the cardboard shape corresponding to the surface of the drum. The surface density of the resulting structure with a coating was 189,5 lb/3000 ft2(308,9 g/m2), the thickness is about 18.2 points. (0.46 mm), surface smoothness 10S by Parker about 2,95 mm.

The second primer coating was prepared in a mixture of 100 parts of powdered calcium carbonate, 16 parts of a polyvinyl acetate latex as a binder and about 1.5 parts of polyvinyl alcohol with a low molecular weight as a thickener. The second primer coating was applied to the paperboard coated with surface coverage density of about 2.5 lb/3000 ft2(4,08 g/m2). The resulting structure with the coating had a surface density 191,8 lb/3000 ft2(312,63 g/m2), of a thickness of about 18.1 item. (0.46 mm) and surface smoothness 10S for Parker - around 2.28 ám.

Preparing the top floor in the form of a pigment mixture of 70 parts of finely ground clay, 30 parts of finely ground calcium carbonate, 20 parts of styrene-acrylic latex (binder) and about 1.5 parts of polyvinyl alcohol with a low molecular weight (thickener). The top coating was applied over the second primer coating with surface coverage density is about 1.9 lb/3000 ft 2(3.1 g/m2). The resulting structure with the coating had a total surface density of about 193,7 lb/3000 ft2(315,7 g/m2), a thickness of about 18.2 points. (0.46 mm) and surface smoothness 10S for Parker - around of 1.26 μm.

Example 3

On the paperboard uncoated weighing about 185 lbs./3000 ft2(301,6 g/m2) was coated with starch weighing about 2.7 lb/3000 ft2(4.4 g/m2using the first process for applying a primer coating described above in Example 2. The resulting structure with the coating had a total surface density of about 187,7 lb/3000 ft2(306,0 g/m2), of a thickness of about 17.9 item. (0.46 mm) and surface smoothness 10S by Parker about 2,40 mm.

Example 4

Made of paperboard uncoated with low bulk density and surface density of about 112 lbs/3000 ft2(189,3 g/m2using full-scale production process. Primer coating of Example 2 was applied in the described manner with the surface coverage density of about 3.8 lb/3000 ft2(6.2 g/m2).

Preparing the coating composition in the form of a 85/15 mixture of finely ground calcium carbonate and fine coating clay, with 14 parts of polyvinyl acetate latex and 2 parts of carboxymethyl the vine (thickener, soluble in water). The top coating was applied over the primer coating, using a typical technology is the application of the top coating, the surface coverage density of about 6.6 lbs/3000 ft2(10.8 g/m2).

The resulting structure with the coating had a total surface density of about 118,5 lb/3000 ft2(193,2 g/m2), a thickness of about 10 points. (0.25 mm) and surface smoothness 10S for Parker - 2,35 mm.

Example 5

Produced paperboard coated using the process described in Example 2, by applying a starch suspension with surface coverage density of about 3 lb/3000 ft2(4.9 g/m2and top coating with surface coverage density of about 6 lbs/3000 ft2(9,8 g/m2). The resulting structure with the coating had a surface density of about 141,8 lb/3000 ft2(231,1 g/m2), a thickness of about 12.8 points. (0.32 mm) and surface smoothness 10S by Parker about 2,20 mm.

Example 6

Made of paperboard uncoated with low bulk density and surface density of about 119 lbs/3000 ft2(194,0 g/m2using full-scale production process. Paperboard uncoated coated by applying a starch suspension with surface coverage density of about 3 lb/3000 ft2(4.9 g/m2), use the Zuya the first part of the primer coatings and related process described in Example 2. The samples were drawn 1 and 2 without outer covering. Samples 3 and 4, provided with a top coating contained top floor, the composition of which is described in Example 2, with surface coverage density of about 8-9 lbs/3000 ft2(13,0 was 14.7 g/m2). Sample 4 was also subjected to typical glazing process on the calender. The results of the tests are presented in Table 1.

Table 1
SampleThe thickness of the sheet (item.)Surface density (ft/stop paper (3000 ft2))The smoothness of the surface 10S by Parker (µm)
111,1121,72,31
211120,82,5
311,5130to 2.29
4the 11.61301,38

Figure 6 graphically presents the ratio of bulk density (i.e. the surface density divided by the thickness) and the thickness of the sheet, obtained in Examples 1-6, and the ratio of bulk density and thickness of a sheet of cardboard according to the prior art. Specialists in the art it should be clear that achieved significantly lower bulk density in the manufacture of cardboard according to the present invention. Specialists in the art should also be clear that the volume density is a function of the thickness, so you should compare the individual thickness separately when evaluating the smoothness of the surface by Parker.

Figure 7 graphically presents the ratio of bulk density and surface smoothness of the Parker cardboard thickness of 10 points (Example 4) according to the present invention, together with the ratio of bulk density and surface smoothness of the Parker cardboard according to the prior art thickness of 10 points. On Fig graphically presents the ratio of bulk density and surface smoothness of the Parker cardboard with thickness of 12 points (Examples 1-6), together with the ratio of bulk density and surface smoothness of the Parker cardboard according to the prior art thickness of 12 points. Figure 9 graphically presents the ratio of bulk density and surface smoothness of the Parker cardboard thickness of 18 points (Examples 1-6), together with the ratio of bulk density and smoothness of the surface is displacement by Parker cardboard according to the prior art thickness of 18 points. Specialists in the art should be understood that the carton according to the present invention has a significantly lower bulk densities in comparison with the prior art, at the same time preserving smoothness (i.e. small quantities of smoothness of the surface by Parker).

Figure 3 graphically presents the ratio of the surface density and thickness of the cardboard of Examples 1-6 together with the proportions of the surface density and thickness of the cardboard according to the prior art (see Fig 1). All points on the graph according to Examples 1-6 fall below the curve Y1representing the curve according to equation 1, while all indicators of cardboard prior art are above the curve Y1. In addition, eight points on the graph of the Examples according to the invention that fall below the curve Y2representing the curve according to equation 2, six points on the graph are below the curve Y3representing the curve according to equation 3, and two points on the graph are below the curve Y4representing the curve according to equation 4.

Similarly, figure 10 graphically presents the ratio of the surface density and thickness of cardboard, made according to the present invention, together with the proportions of the surface density and thickness which are cardboard according to the prior art. All points on the graph are below the curve Y1'representing the curve according to equation 6, while all indicators of cardboard according to the prior art are above the curve Y1'. In addition, several points on the graph are below the curve Y2'representing the curve according to equation 7, and a few more points on the graph falls below the curve Y3'representing the curve according to equation 8, and the others fall below the curve Y4'representing the curve according to equation 9.

Although the values of the surface density are now presented in figure 3 and 10 for different ranges of thicknesses, specialists in the art it should be clear that as disclosed coatings and technologies you could get a cardboard with unusually low surface densities at thicknesses of about 10, 11, 12, 13 and 18 points, one can expect that similar small surface density can be achieved with other thicknesses.

Thus, the cardboard according to the present invention has the desired smoothness (for example, surface smoothness 10S for Parker, the youngest of 3 μm and even less 1.5 μm) while maintaining low bulk density (for example, when the surface density, smaller disclosed thresholds, which is a function of the thickness. Although this cardboard demand for the IAOD, the authors believe that it has not yet been obtained according to the prior art.

Although various aspects of the disclosed paperboard with low bulk density shown and described, specialists in the art can be made modification on the basis of information obtained by the introduction of this documentation. This patent application covers such modifications and is limited only by the scope of the claims.

1. Carton containing:
solid substrate paperboard of bleached sulfate pulp (oscs); and
the coating on the substrate paperboard for forming patterns with the floor where the above-mentioned structure with the coating has a surface density, the sheet thickness and surface smoothness by Parker, and the above-mentioned surface smoothness by Parker is at most about 3 microns, referred to the surface density is at most about Y2lb/3000 ft2where Y2is a function of the above-mentioned thickness (X) of the sheet at points, and it is calculated using the equation:
Y2=3,71+13,14X-0,1602X2,
or, alternatively, referred to the surface density is at most about Y3lb/3000 ft2where Y3is a function of the above-mentioned thickness (X) of the sheet at points, and it is calculated using the equation:
Y3 =3,63+12,85X-0,1566X2,
or, alternatively, referred to the surface density is at most about Y4lb/3000 ft2where Y4is a function of the above-mentioned thickness (X) of the sheet at points, and it is calculated using the equation:
Y4=3,50+12,41X-0,1513X2.

2. Cardboard according to claim 1 in which the said coating contains at least the ground floor and the upper floor where the above-mentioned primer coating is located between the said upper surface and said solid substrate cardboard from the OSC.

3. The carton according to claim 2, in which the said coating further comprises an intermediate coating layer, located between the said primer coating and said upper surface.

4. Cardboard according to claim 1 in which the said coating contains starch.

5. Cardboard according to claim 1 in which the said coating contains calcium carbonate coarse and clay with a high value of the shape factor of the particles.

6. Cardboard according to claim 1, the said smooth surface of which Parker is at most about 2.5 microns.

7. Cardboard according to claim 1, the said smooth surface of which Parker is at most about 2.0 microns.

8. Cardboard according to claim 1, the said smooth surface of which Parker is at most about 1.5 microns.

9. Cardboard according to claim 1, which referred to the e coating comprises at least one pigment and in which each of these pigments in the above-mentioned coating is an inorganic pigment.

10. Cardboard according to claim 1, in which the aforementioned solid substrate paperboard of bleached sulfate pulp (oscs) essentially does not contain chemicals that increase the volume.

11. Cardboard according to claim 1, in which the aforementioned solid substrate cardboard from the OSC has a surface density that constitutes at least 85 lb/3000 ft2(138,34 g/m2).

12. Cardboard according to claim 1, in which the aforementioned solid substrate of oscs is a single-layer substrate.

13. Cardboard according to claim 1, in which the aforementioned solid substrate from the OSC consists essentially of cellulose.



 

Same patents:

FIELD: textiles, paper.

SUBSTANCE: paper base is intended for internal and external sizing, which has high dimensional stability, and can be used in pulp and paper industry. Paper base contains cellulose fibers, at least one filler, and sizing agent. At that the paper base has a coefficient of hygroextension from 0.6 to 1.5%. The Scott internal constraint in the transverse direction is not greater than 300 J/m2, and/or Scott internal constraint in the longitudinal direction is not greater than 300 J/m2. Also a method of manufacturing the paper base and versions of paper base are proposed.

EFFECT: increased dimensional stability and durability of the surface of the paper base.

26 cl, 24 dwg, 15 tbl, 5 ex

FIELD: paper industry.

SUBSTANCE: paper product comprises a substrate selected from paper or cardboard, and a coating on the substrate with voids in it. The coating on the substrate comprises a water soluble polymer. The water-soluble polymer is selected from a group consisting of starch, waxy corn starch, protein, polyvinyl alcohol, casein, gelatin, soybean protein, and alginates. The coating additionally comprises a crosslinking agent. The paper product is substantially free of an elastomeric material. A method of processing a substrate for the paper product comprises coating an aqueous solution of the polymer on the film substrate, fixation of an aqueous solution of the polymer by contacting of the aqueous solution of the polymer with a heated surface up to formation of voids in the film. The phase of fixation comprises at least a partial drying of aqueous polymer solution.

EFFECT: obtained paper product is characterised with improved smoothness with no increase in density and has excellent printability.

27 cl, 3 ex, 1 tbl, 17 dwg

FIELD: textile, paper.

SUBSTANCE: paper base is designed to form a decorative material of a coating. It represents a non-processed paper containing a white pigment and/or fillers and is coated with a covering solution, containing at least one water-soluble modified starch with special distribution of molecules according to molecular weight. Also a decorative paper or decorative material is proposed to form coatings with application of the above-specified paper-base.

EFFECT: improved quality of a finished product due to increased inner strength of fixation with high non-transparency and other mechanical properties, improved stability of paper size stability and increased average size of its pores.

7 cl, 2 tbl, 6 ex

FIELD: textile, paper.

SUBSTANCE: method includes formation of composition, containing water, raw starch and powder optical refining agent. Boiling of composition. Application of finished composition, at least on one surface of paper or cardboard base in coating press. Then base is dried. In another version of method composition is boiled at the temperature up to 299°F inclusive.

EFFECT: improved brightness of paper and cardboard.

7 cl, 4 dwg, 8 tbl, 1 ex

FIELD: paper industry.

SUBSTANCE: paper with improved rigidity and bulk and method of its manufacturing may be used in pulp and paper industry and are intended for photocopier equipment. Paper comprises three-layer double-tee structure that forms a single web. It has central core layer manufactured mainly from cellulose, bulk of which is increased with the help of filler, such as hydrazine salt. Starch-based coating is applied on both sides of core layer, at the same time starch has high content of solid products. Coating forms three-layer paper having composite structure with outer layers of high strength that surround core of low density.

EFFECT: improved strength, rigidity and resistance to twisting of produced material.

32 cl, 2 dwg, 3 tbl, 3 ex

FIELD: textiles, paper.

SUBSTANCE: paper or cardboard of improved rigidity and bulk are meant for reproducing equipment and the method refers to production of the said paper and cardboard. The paper or cardboard has the core layer and starch-based layers applied by gluing-up on its both sides forming the uniform canvas of the double-T structure. The layers cover the upper and the lower surface of the central layer with minimal penetration to the central layer. The starch contains the filler spreading to the central layer. The starch has high content of solid products. The mass of the coating layers is 2-10 g/m2. Method for producing paper or cardboard includes the following stages: a) creation of composition containing cellulose fibers and the filler, b) formation of fibrous canvas, c) drying of the fibrous canvas, d) processing by gluing-up both sides of the dried canvas with the starch with filler and e) drying of the fibrous canvas with formation of the three-layer making the uniform canvas material with the double-T structure.

EFFECT: increased quality of paper or cardboard due to increased smoothness, decreased hygroscopic expansivity, improved fold resistance and paper rolling resistance.

30 cl, 2 dwg, 3 tbl, 3 ex

FIELD: textiles; paper.

SUBSTANCE: composition is designed for refining fibrous material, can be used in the production of enamelled cardboard and paper and relates to the cellulose-paper industry. The composition contains a modified pigment and a water soluble binding substance. The pigment is calcium sulfoaluminate, modified starch or polyvinyl alcohol with mass ratio content of 0.5-1.5. The water soluble binding substance is starch.

EFFECT: resistance to fluffing and whiteness of the coating with considerable lowering of consumption of the binding substance when making the composition.

1 tbl

FIELD: textiles, paper.

SUBSTANCE: solution is meant for rifining of fibrous material. It pertains to the field of paper manufacturing and cardboard during manufacturing of chalk-overlay types of cardboard and paper. The solution consists of water soluble binder. A mixture of calcium salfoaluminate and kaolin, modified starch or polyvinyl spirit is used as the pigment. The technical result is high stability to picking, whiteness, colour perception and smoothness. The solution enhances adhesion of the coating to the base (cardboard or paper), which makes it possible to use the refined coating as a sub-layer when dual or tri-coating cardboard or paper, with obtaining products with a given range of characteristics.

EFFECT: obtaining of a solution for refining material for production of paper and cardboard during production of chalk-overlay types of cardboard and paper.

1 tbl, 1 exr

FIELD: pulp and paper industry; methods of production of the pigment for manufacture of the cardboard and paper.

SUBSTANCE: the invention is pertaining to the method of production of the pigment for manufacture of the cardboard and paper and may be used in pulp and paper industry at production of the filled paper, the coated paper and the cardboard. Calcium carbonate is treated with aluminum sulfate in the aqueous medium. The treatment is conducted at aluminum sulfate consumption of 25-105 % to the mass of absolutely dry calcium carbonate at the temperature of 80-85°С during 90-180 minutes with production of the suspension containing 25-35 % dry substances in it. At that they use the aqueous medium containing the binding chosen from the group, which includes starch and polyvinyl alcohol in the amount of 0.5-3.0 mass % from the mass of the absolutely dry pigment, and-or the water soluble colorant in the amount of 0.1-0.5 mass % from the mass of the absolutely dry pigment. The suspension is additionally dried and grinded. The technical result of the invention is the improved quality of the pigment as well as expansion of its field of application.

EFFECT: the invention ensures the improved quality of the pigment as well as expansion of its field of application.

2 tbl

FIELD: pulp and paper industry; methods of production of the pigment for manufacture of the cardboard and paper.

SUBSTANCE: the invention is pertaining to the method of production of the pigment for manufacture of the cardboard and paper and may be used in pulp and paper industry at production of the filled paper, the coated paper and the cardboard. In the water at intense stirring feed powders of calcium hydrate and calcium carbonate at the ratio of the indicated components accordingly from 1.0:2.2 up to 1.0:12.9. The produced suspension is gradually added with aluminum sulfate at its ratio to the total mass of the calcium hydroxide and calcium carbonate from 1.0:0.85 up to 1.0:4.30. Then the temperature of the mixture is increased up to 8О-85°С and the produced reaction mixture is kept at stirring within 90-180 minutes with formation of the dispersion of the pigment with the share of the dry substances in it equal to 20-35 %. Then the dispersion is dried and grinded into the powder. The powder is dispersed in the water containing the given amount of the dissolved coolant and-or binding - starch or polyvinyl alcohol. The technical result of the invention production of the pigment with the new properties, that allow to expand the field of its application at manufacture of various types of the cardboard and the paper.

EFFECT: the invention ensures production of the pigment with the new properties, expansion of the field of its application at manufacture of various types of the cardboard and the paper.

2 tbl

Pigment composition // 2461595

FIELD: chemistry.

SUBSTANCE: water-based pigment composition contains polyalkylene glycol, having average molecular weight Mw from approximately 5000 to approximately 75000, and inorganic pigment particles containing colloidal particles based on silicon oxide or silicate or aggregates thereof. The amount of polyalkylene glycol ranges from 50 to 100 wt % with respect to the total amount of organic material in the composition, and the weight ratio of said colloidal particles to the organic material ranges from 1:3 to 30:1.

EFFECT: invention also relates to a method of producing said composition, use thereof to coat paper or cardboard, a method of obtaining coated paper or cardboard.

25 cl, 2 tbl, 4 ex

FIELD: paper industry.

SUBSTANCE: paper product comprises a substrate selected from paper or cardboard, and a coating on the substrate with voids in it. The coating on the substrate comprises a water soluble polymer. The water-soluble polymer is selected from a group consisting of starch, waxy corn starch, protein, polyvinyl alcohol, casein, gelatin, soybean protein, and alginates. The coating additionally comprises a crosslinking agent. The paper product is substantially free of an elastomeric material. A method of processing a substrate for the paper product comprises coating an aqueous solution of the polymer on the film substrate, fixation of an aqueous solution of the polymer by contacting of the aqueous solution of the polymer with a heated surface up to formation of voids in the film. The phase of fixation comprises at least a partial drying of aqueous polymer solution.

EFFECT: obtained paper product is characterised with improved smoothness with no increase in density and has excellent printability.

27 cl, 3 ex, 1 tbl, 17 dwg

FIELD: textile, paper.

SUBSTANCE: paper base is designed to form a decorative material of a coating. It represents a non-processed paper containing a white pigment and/or fillers and is coated with a covering solution, containing at least one water-soluble modified starch with special distribution of molecules according to molecular weight. Also a decorative paper or decorative material is proposed to form coatings with application of the above-specified paper-base.

EFFECT: improved quality of a finished product due to increased inner strength of fixation with high non-transparency and other mechanical properties, improved stability of paper size stability and increased average size of its pores.

7 cl, 2 tbl, 6 ex

FIELD: construction.

SUBSTANCE: wallpapers have a base and a face and a reverse sides. A coating that contains an antibacterial agent is applied onto the face side of the base. The coating antibacterial agent is represented by silver nanoparticles. The coating is produced by mixing of a varnish and a carbon porous carrier with silver nanoparticles in specified amount. Silver nanoparticles size is 2-50 nm. The carbon porous carrier has specific density of 0.03-0.1 g/cm3, specific surface of 50-200 m2/g and pore size of 5-50 nm. The varnish is a water-based acrylic varnish or an alkyd varnish. The wallpaper base is made of paper or cloth. The face surface of wallpapers is made of paper, cloth, fabric fibres or polyvinyl chloride. The carbon porous carrier with silver nanoparticles is in powder form. Glue is applied onto the reserves side of wallpapers.

EFFECT: higher quality of wallpapers and simplified technology of their manufacturing.

14 cl

FIELD: textile, paper.

SUBSTANCE: method includes formation of composition, containing water, raw starch and powder optical refining agent. Boiling of composition. Application of finished composition, at least on one surface of paper or cardboard base in coating press. Then base is dried. In another version of method composition is boiled at the temperature up to 299°F inclusive.

EFFECT: improved brightness of paper and cardboard.

7 cl, 4 dwg, 8 tbl, 1 ex

FIELD: fabrics, paper.

SUBSTANCE: invention is related to glossy chalk overlay universal paper for printing, which may be used in wide range of office equipment for printing, including jet and electrophotographic printing, to method of chalk overlay paper making. Chalk overlay paper contains paper web and pigment composition applied onto at least one surface of web. Specified composition of pigment coat comprises the first pigment with specific surface BET in the range from approximately 50 to 750 m2/g; the second pigment with specific surface BET in the range of approximately from 5 to 49 m2/g; and polymer binder. Besides specified chalk overlay paper has glossiness of coat equal to or more than approximately 30% at the angle of 75° and length of absorption Bristow less than approximately 180 mm.

EFFECT: paper has superb properties of ink absorption, toner fixation and provides for obtaining the imprint of high quality.

10 cl, 3 dwg, 15 tbl, 8 ex

FIELD: textile fabrics, paper.

SUBSTANCE: method is related to production of coated paper or cardboard. Method includes application of pigment composition as coating on at least one side of paper or cardboard web. Specified pigment composition is water dispersion, which includes optionally aggregated colloidal particles of silicon dioxide or aluminium silicate as pigment particles, which are prepared from alkali metal silicate by ion exchange or pH reduction and having surface area of approximately from 30 m2/g to approximately 450 m2/g. Coating contains also at least one cationic component selected from group that consists of water-soluble aluminium salts and cationic polymers with molecular weight from approximately 2,000 to approximately 1,000,000 and charge density from approximately 0.2 mEq/g to approximately 12 mEq/g, in which at least approximately 0.4 g of pigment particles from pigment composition is applied on m2 of coated side of paper or cardboard web. Invention is also related to paper or cardboard produced by this method. It is also related to composition of above mentioned pigment in the form of water dispersion, which includes less than approximately 3 wt % of organic binders and to method of above mentioned pigment composition production, in which mixing is done to produce water dispersion in order to avoid gel formation and deposition.

EFFECT: improvement of printing and strength properties of coating, and also lower scuffing of paper.

26 cl, 5 tbl, 4 ex

FIELD: textiles, paper.

SUBSTANCE: wear proof particles are treated with adhesion promoter based on silane or sylon and then deposited on paper, impregnated with resin, thereby obtaining coating. Fibre is electrically charged and put onto the coating. Drying is then carried out. The device for implementing the given method has a equipment for depositing wear proof particles on paper, equipment for charging fibre and putting the charged fibre onto the paper. The latter consists of a roller with depressions, made with provision for rotating, and a brush mounted near the roller for cleaning the depressions. The device also has apparatus for electrically charging the roller and/or the brush and the roller, which is made with provision for rotation and passing paper sheets under the roller with depressions. Paper, made using this technique, has a wear proof coating and electrically charged fibres on the wear proof coating. The charged fibres used can be made from polyester and/or cotton, and/or cotton linter.

EFFECT: obtaining wear proof paper with improved properties.

14 cl, 3 dwg

FIELD: technological processes.

SUBSTANCE: this paper for printing consists of base and coating applied on it, which contains binding agent and filler. At that components are contained with preset proportion. As binding agent coating contains substance selected from the group that includes starch, carboxymethylcellulose, polyvinyl alcohol, gelatine and their mixtures. As filler coating contains substance selected from the group that includes calcium sulfoaluminate, fine-grained starch, talc, silica gels and their mixture. Mass of coating on paper base amounts to 10-25 g/m2. Possibility occurs to use thermal transfer paper in production of different items with firmly printed colour images, both with application of jet printing method and typography printing methods.

EFFECT: provision of high rate of ink drying and images printed with them on paper in the complete range of ink densities.

4 cl, 3 tbl, 3 ex

FIELD: production of ink-jet printing paper with special pigment coat applied thereto.

SUBSTANCE: method involves manufacturing paper-base; applying onto one side of paper-base ink-perceptive coat consisting of pigment, binder and cationic fixative; applying onto opposite side of paper-base curling-preventive coat; refining both surfaces of paper; using mixture of amorphous silicon dioxide and calcium or kaolin carbonate as ink perceptive pigment for coat, said mixture having specific outer surface less than 20 m2/g in the ratio of (75-45):(25-55); using polyvinyl alcohol as binder in an amount of 20-25% by weight of pigment; using polydiallyl dimethylammonium chloride as cationic fixative.

EFFECT: improved printing characteristics and increased paper surface strength.

3 cl, 1 tbl, 7 ex

Wipe product // 2430709

FIELD: medicine.

SUBSTANCE: wipe product relates to absorbent paper products. A wipe product represents a wipe sheet having a first side and a second side. The wipe sheet contains cellulose fibres in an amount at least 50 wt %, and an additional composition containing polymer. The additional composition is present at least on the first side of the wipe sheet. The wipe product has extensionality exceeding 3 cm3/g, a fluffiness test value less than approximately 3 mg, and the first side of the wipe sheet has a stick-slip value more than approximately 0.01. The additional composition contains a non-fibrous olefin polymer, ethylene carboxylic acid copolymer or their mixture. The additional composition can be included in a wipe cloth by means of fibre combination to be used for cloth formation. Alternatively, the additional composition can be superficially applied on the formed cloth.

EFFECT: better quality of the wipe product.

20 cl, 42 dwg, 18 tbl, 7 ex

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