Method of manufacture of paper-based coloured product and paper-based coloured product

FIELD: paper industry.

SUBSTANCE: one side of paper-based substrate is coated with the first dyeing composition to provide the degree of whiteness L* with the value of L1. The second dyeing composition is applied to the opposite side of the substrate having the degree of whiteness L* with the value of L2. A colored product is obtained, characterised by the degree of whiteness L* with a value of L3 for the first coated side. The second coated side of the product has a degree of whiteness L* with a value of L4. Thus L1 is not more than 8 points higher than L3, and L2 is at least 30 points higher than L4. The degree of whiteness L* is determined using the colour characteristics CIE L* a* b*, a clarifier D 65, and at the observation angle of 10C. In this method, the penetration of dyeing substances of the dyeing composition is adjusted so that the minimal impact is achieved on the degree of whiteness of the coating of white or light colour on the opposite side of coloured paper.

EFFECT: obtaining high-quality colored paper, which has a high contrast ratio to ensure high-level package, simplification of method, reducing of cash expenses, time expenditures and labor.

15 cl, 1 dwg, 2 tbl

 

Background of invention

Paper or cardboard used for packaging high level, for example, for packaging cigarettes or cosmetics usually have a large contrast between the two sides of the sheets. The contrast may be between the black or dark color on one side and white or significantly lighter color on the opposite side. For example, this color high quality paper made by laminating on one side of the paper black color metal foil.

Colored paper is usually made by adding coloring agents such as dyes and pigments, pulp, wet part of the paper manufacturing process, prior to forming the paper web. This process of making colored paper has a number of disadvantages. Pigments are usually insoluble in water; therefore, the required alum and/or auxiliary holding means for holding pigments in paper canvas. In addition, poor adhesion of the pigments to the paper weight results in low level of fade resistance. To overcome this disadvantage in the weak coupling, in patent US 5131981 disclosed a process for dyeing paper in the wet end of the papermaking machine by ispolzovaniya pigments and substances for fixing color in which a pigment and a substance for fixing colors add simultaneously in pulp, subject to staining. Use of cationic compounds substances for fixing color, to improve the adhesion of pigments with a paper weight. The addition of dyes in paper weight cause staining of wastewater, leading to environmental pollution and other complications of the process. Staining occurs throughout the thickness of the paper, therefore, requires a large amount of coloring substances. This happens even if you want to staining only the surface of the paper, which leads to unnecessary costs. In the formulation of each batch of paper is necessary to make a large quantity. The minimum amount of paper produced in a paper mill in the formulation of each batch of paper, a lot more is usually required number of colored paper to the high level. As a result, the paper manufacturer is burdened with a large stock of unused colored paper or paper mill begins production of colored paper until, until ordered at least the minimum number of each batch of paper.

Colored paper can be produced by applying a dye composition to the surface of the paper after the formation of the paper. As stated in the PCT publicat and WO 2007/128077, this process ensures the production of colored paper with the qualitative characteristics that make it suitable for packaging, but, unfortunately, this process is costly. For higher quality paper used in wrapping paper to the high level to which the requirements of high contrast between the sides of the paper, this process has the additional disadvantage. When applying a dye composition to the surface of the paper dyes penetrate into the inner part of the paper and can adversely affect the color of the opposite side of the paper. This disadvantage is particularly pronounced when the paper first paint in white or light color, then painted in black or dark color on the opposite side. Coloring matter of black or dark color can penetrate into the paper and reduce the amount of white on the opposite side, covered with coloured substances of white or light color. As a result, high quality paper, used for packing high level, usually produced by: (a) dyeing of paper pulp in the wet end of the paper manufacturing process pigment black or dark color; (b) molding painted a sheet of colored paper pulp; (c) rolling in the roll painted boom is the author of the canvas, the resulting manufacturing process; (d) transfer and (e) fast-painted paper web to conduct the process of laminating paper with foil or Autonomous application of the dye composition of white or light color. This process, corresponding to the modern level of technology in this field, is a process requiring large expenditures of time and labor, complicated and expensive.

Accordingly, there is still a need in the production process of colored paper of high quality with high contrast, used for packing high level, which would be relatively more simple, less capitalstream, as well as requiring less time and labor in comparison with the process corresponding to the modern level of technology in this field.

It is also advisable to have the process of making colored paper of high quality with high contrast, which consists in applying a dye composition for molded paper, whereby the penetration of the dyes of the dye composition may be adjusted so as to achieve minimal impact on the whiteness of the coating of white or light color on the opposite side of colored paper.

Disclosure of invention

Color boom is se high quality with high contrast, suitable to ensure the packaging of high level is produced by implementing a controlled penetration of the dye composition through the paper. The first side of the paper cover the first coloring composition. Then put the second pigment composition on the second side (i.e. on the opposite side) of the paper so that the dye included in the second pigment composition, penetrated through the paper web, but had no significant effect on the degree of whiteness of the coating of white or light color of the first coated side of the paper. If necessary, the first pigment composition may be applied to paper production line during the paper manufacturing process.

Brief description of drawing

The drawing shows one variant of implementation of the open method of making colored paper of high quality with high contrast, suitable for providing packaging high level.

Detailed description of the invention

The present invention is described below in more detail, but not all embodiments of the invention necessarily shown. Although the invention is described with reference to the above as examples of embodiments of the specialists in the art should understand that the invention may be made by the hypoxia changes and that the elements of the invention can be replaced by an equivalent solutions without deviation from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the provisions of the invention without straying from the main volume.

The open method of manufacturing a colored product on a paper basis includes the steps:

(a) providing a substrate on a paper base having a first side and a second side;

(b) coating on the first side of the substrate as the first coloring composition to ensure a degree of whitenessL*with the value of L1; and

(c) coating the second side of the substrate, having a degree of whitenessL* value of L2, in the form of the second coloring composition to obtain a colored product on a paper basis, characterized by whitenessL* first side coated with a value of L3, and the degree of whitenessL*the second side coated with a value of L4,

where L1 is not more than 8 points higher than L3, and L2 is at least 30 points more than L4, and where the degree of whitenessL* determine, using the color characteristic of the CIEL*a*b*(CIE - international Commission on illumination (CIE)), when using light D65 and observation angle of 10.

Figure 1 shows one variant of implementation of the open method of making colored paper of high quality with high contrast, suitable for securing the packing in the high level. The substrate 100 on the paper base has a first side 101 and the second side 102. The first coloring composition is applied to the side 101 of the paper, resulting in a gain whitenessL*equal to L1, coated side 101. Uncoated second side 102 has a degree of whitenessL*equal to L2. Then on the side 102 of the substrate put the second pigment composition and get a color the paper with double-sided coating, characterized by the degrees of whitenessL* sides 101 and 102 with a floor equal to L3 and L4, respectively. The resulting color high quality paper has a value L1, more than 8 points greater than the value L3, and L2, exceeding by at least 30 points the value of L4, where the degree of whitenessL*determine, using the color characteristic of the CIEL*a*b*when using light D65 and observation angle of 10.

In one embodiment of the present invention, the second dye is a member of the second coloring composition penetrates into the treated paper is adjustable so that it can be achieved by a gradual decrease in intensity of the second color from the second coated side to the first coated side.

In addition, the penetration of the second coloring substance included in the second coloring composition can be adjusted so that obrabotan the paper I was second colored dye along its entire thickness or only partially. The second dye can be painted, if necessary, from about 10% to about 100% of the thickness of the treated paper.

In one embodiment of the present invention on a substrate based on paper first coated on the first side in the form of a white or light colored composition. Then coloring composition of black or dark color is applied on the second side (i.e. on the opposite side) of the paper so that the dye included in the black or dark color, penetrated through the paper web, but had no significant effect on color or whiteness of the first coated side of the paper.

In one embodiment of the present invention colored paper containing the first side, covered with a white or light colored dye composition can be produced on the production line during the paper manufacturing process.

In one embodiment, the present invention is white or bright coloring composition is a composition for coating paper, for example, which are commonly used in the pulp and paper industry.

In one embodiment of the present invention on the first side of the substrate on a paper basis apply the coating to the paper coating production line during the paper manufacturing process to obtain a paper about what nestorone coated surface. Then on the uncoated side of the resulting paper with one-side coated coating is applied pigment composition of black or dark color.

In one embodiment of the present invention the second coloring composition contains a dye and surfactant (surfactant) in such proportions that the dye may be adjustable to penetrate the paper web without a significant impact on color or whiteness the other side of the paper. Here surfactant is a component that has a significant impact on the regulation of penetration into the paper web coloring substance included in the second coloring composition. The ratio of the coloring matter and surfactants in the second crusade composition can be optimized to ensure minimal impact on color or whiteness the other side of the paper. This ratio may depend on many factors, such as the thickness of the substrate is paper-based, the type of the applied dyes, the type of pulp used in the substrate on a paper basis, and especially on the type of final destination of the package. Thus, there is a range of ratios of the coloring matter and surfactants used in a real second coloring composition.

In one embodiment of the present invention the second coloring with the becoming contains:

(a) from about 1 wt.% up to about 10 wt.% the coloring matter; and

(b) from about 1 wt.% up to about 5 wt.% Surfactant.

In one embodiment of the present invention the second coloring composition contains:

(a) from about 1 wt.% up to about 10 wt.% the coloring matter; and

(b) from about 0.1 wt.% to about 3.0 wt.% Surfactant.

Surface-active substances (surfactants), suitable for use according to the present invention can be anionic, cationic, nonionic, amphoteric surfactants and their combinations. Examples of surfactants include (but their composition is not limited to this list): polyalkyleneglycol, copolymers of polypropylene oxide and polyethylene oxide, fatty acid and surfactants based on fatty acids derivatives.

In one embodiment, the present invention coloring composition contains a dye and a surfactant and does not contain glue. Without any intention to be bound to any theory, it appears that the glue prevents the penetration of the coloring matter in the inner part of the paper.

Color formulations can be applied to the substrate on a paper basis, using any known method of application. Such methods include (but their composition is not limited to this list): press method of applying sizing, application by brush, spray, rollers, coating with removing the excess strap, coating by dipping, pouring, air is pushed by the scraper, irrigation and their combinations.

Examples

Bleached paperboard used as a substrate on a paper basis. Composition for coating was applied on one side of cardboard. The resulting paperboard coated with the coating was then divided into two groups. The first group was kept as control group samples. On the uncoated side of the second group of samples of cardboard coated with a coating was applied pigment composition of black color, which contained about 2 wt.% Surfactant and about 5 wt.% the black coloring matter, for coloured cardboard with double-sided coating. Determined thickness, color, tint, and surface smoothness of the specified color cardboard with double-sided coating and control group samples of cardboard coated with coating.

The gauge, or thickness, of cardboard were measured according to standard test conditions TAPPI T 411 (TAPPI - Technical Association of paper industry (USA)). Used two types of techniques to determine the surface smoothness of cardboard: test Parker Print Surf (PPS), corresponding to the standard test conditions TAPPI 555, and test Sheffield, corresponding to the standard test conditions TAPPI 538.

Determine the color and hue of each side of the test cardboard, using the color characteristic of the CIEL*a*b*. The value ofL* represents the degree of whiteness or the total amount of light reflected by the surface of the paper, whereL*=0 means black, andL*=100 indicates diffuse white color. Value a* represents the axis from green to red/purple color, where a negative value fora*mean green color, whereas a positive value fora*means purple color. The value ofb*represents the axis from blue to yellow, where a negative value forb*means blue, and a positive value forb*means yellow. Color cardboard was determined in the color space CIEL*a*b*at the observation angle of 10 when using light D65 as a light source. Each side of each cardboard were subjected to tests to determine the color three times to obtain average valuesL*, a* andb*.

The properties of the control sample carton shown in Table 1, and properties disclosed in the invention of the double-sided color coated cardboard shown in Table 2. The color in the color space CIEL*a*b*hand control sample cardboard coated with the coating compared with the color of the side coated with the coating sample carton disclosed in the invention. The color in the color space CIEL*a*b*the uncovered side of the control sample cardboard with animali with the color of the part disclosed in the invention sample cardboard, covered with the coloring composition of black color.

When the uncoated side of the cardboard was covered with the coloring composition of the black color, the values ofL*, a*andb*significantly decreased, confirming a significant change in tone and color. WhitenessL*(L4) the parties disclosed in the invention of cardboard, covered with the coloring composition of black color, was 66 points lower degree of whiteness L* (L3) uncoated side of the control sample cardboard coated with coating. On the other hand, the degree of whitenessL*(L2) side coated with the coating disclosed in the invention cardboard was approximately the same as the whiteness L1 side coated with a coating control sample cardboard. This means that the coloring composition of the black color has penetrated into the interior of the carton to a certain level, but not through the cardboard. If the coloring composition of black color penetrated the cardboard to the other side coated with a coating, the degree of whiteness L4 would be considerably smaller.

Table 1
The thickness (number of points)Smoothness by the method of PPSSmoothness according to the method SheffieldStoro is well with white coating Party without coating
L*(L1)a*b*L*(L3)a*b*
13,21,82494,683-1,1302,83693,623-1,5722,237
94,670-1,1772,79693,654-1,5592,210
94,683-1,1602,78293,690-1,5682,212
94,679-1,1562,80593,656-1,5662,220

Table 2
The thickness (the number is on point) Smoothness by the method of PPSSmoothness according to the method SheffieldThe side with the white coatingSide, covered with a dye composition disclosed in the invention
L*(L2)a*b*L*(L4)a*b*
13,91,96692,784-1,0792,92427,3640,014-0,886
93,005-1,0482,49327,323-0,017-0,903
93,326-0,9893,04327,540-0,002-0,857
93,038-1,0392,82027,09 -0,002-0,882

In Tables 1 and 2 shows the controlled diffusion of the coloring matter black cardboard with minimal impact on the tone or the color of the side coated with the coating.

In the above example disclosed in the invention painted cardboard contains from one side coated the floor, and on the opposite side of the floor black. However, it should be understood that this example is merely one embodiment and is not intended to limit the scope of the present invention.

Although the invention is described with reference to various specific embodiments of, it should be understood that it may be made a variety of changes within the essence and scope of the described invention. It is assumed that the invention should not be limited to the described variants of implementation, and should cover the entire volume defined by the following claims.

1. A method of manufacturing a colored product on a paper basis, comprising the steps:
(a) providing a substrate on a paper base having a first side and a second side;
(b) coating on the first side of the substrate as the first coloring composition to ensure a degree of whiteness L* value of L1; and
(c) coating the second side of p is Daiki, having a whiteness L* value of L2, in the form of the second coloring composition to obtain a colored product on a paper basis, characterized by whiteness L* value of L3 to the first side, provided with a floor, and a whiteness L* value of L4 to the second side provided with a coating;
thus L1 is not more than 8 points higher than L3, and L2 is at least 30 points more than L4, and the degree of whiteness L* determine, using the color characteristic of the CIE L*a*b*, when using light D65 and observation angle of 10.

2. The method according to claim 1, in which L1 is not more than 3 points higher than L3.

3. The method according to claim 1, wherein L2 is at least 40 points higher than L4.

4. The method according to claim 1, wherein the second pigment composition includes a second dye, and the color intensity of the second coloring substance in the color of the product on a paper basis gradually decreases in the direction from the second coated side to the first coated side.

5. The method according to claim 1, wherein the second coloring composition contains a dye, which dye from 10% to 100% of the thickness of the coated product on a paper basis.

6. The method according to claim 1, wherein the first pigment composition includes a composition for coating paper.

7. The method according to claim 1, wherein the first coloring composition is applied to the substrate during the manufacturing process of paper.

8. The method according to claim 1, wherein the second pigment composition contains:
(a) from 1 wt.% up to 10 wt.% the coloring matter; and
(b) from 1 wt.% up to about 5 wt.% surface-active substances.

9. The method according to claim 8, in which the second coloring composition does not contain glue.

10. A colored product on a paper basis, obtained by the method comprising the steps:
(a) providing a substrate on a paper base having a first side and a second side;
(b) coating on the first side of the substrate as the first coloring composition to ensure a degree of whiteness L* value of L1; and
(c) coating the second side of the substrate, having a degree of whiteness L* value of L2, in the form of the second coloring composition, while
(i) the first side of the product, provided the coating has a degree of whiteness L* value of L3, and a second side provided with a coating, has a degree of whiteness L* value L4;
(ii) L1 is not more than 8 points higher than L3, and L2 is at least 30 points more than L4, and the values of the degrees of whiteness L determine, using the color characteristic of the CIE L*a*b*, when using light D65 and observation angle of 10.

11. Product of claim 10, characterized by the increase smoothness by the method of Parker Print Surf no more than 1 paragraph after application of the second pigment composition in step (C).

12. Product of claim 10, characterized HC is the increased thickness of not more than 1 point after applying the second pigment composition in step (C).

13. Product of claim 10, in which the second coloring composition contains a second dye, and which is additionally characterized by a gradual decrease in the color intensity of the second coloring substance in the direction from the second coated side to the first coated side.

14. Product of claim 10, in which the second coloring composition contains a second dye, and which is additionally characterized by the fact that from 10% to 100% of the thickness of the second colored dye.

15. Product of claim 10, in which the second coloring composition contains:
(a) from 1 wt.% up to 10 wt.% the coloring matter; and
(b) from 1 wt.% up to 5 wt.% surfactants.



 

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3 cl, 1 tbl, 7 ex

FIELD: pulp-and-paper industry.

SUBSTANCE: coating composition consisting of ink-compatible pigment, binder, and cationic fixative is deposited onto one of the sides of based paper and the other side is covered with detwisting coating, after which coating is ennobled by means of supercalendering. As pigment, mixture of amorphous silicon dioxide with calcium carbonate or kaolin with outer specific surface 60-85 m2/g at ratio (25-50):(75-50). Binder is a mixture of polyvinyl alcohol with latex selected from class of styreneacrylic copolymers at ratio (20-25%):(7-18%) based on the weight of pigment. Cationic fixative is poly(diallyldimethylammonium chloride), which is directly incorporated into coating composition in amount 5-10%.

EFFECT: enabled image quality and paper surface strength control.

3 cl, 1 tbl, 13 ex

FIELD: pulp-and-paper industry.

SUBSTANCE: coating composition consisting of ink-compatible pigment, water-soluble binder, and cationic fixative is deposited onto one of the sides of based paper and the other side is covered with detwisting coating, after which glossy surface is formed. Coating composition is supplemented by wettability controlling agent based on polydimethylsiloxane resins in amounts 0.4 to 1.6% of the weight of pigment. Water-soluble binder is a mixture of polyvinyl alcohol with polyvinylpyrrolidone at ratio (90-50):(10-50) in amount 40-60% and styreneacrylic latex in amount 15-20% of the weight of pigment. When forming glossy surface, polyethylene oxide-based plasticizer is used in amount 7-15% of the weight of pigment followed by supercalendering at pressure in roll contact zone 20-25°C and temperature 50-90°C.

EFFECT: improved manufacturability of process.

5 cl, 1 tbl, 54 ex

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