Sheet feeling hash to the finger

FIELD: pulp-and-paper industry, in particular, paper sheet having surface feeling hash to the finger, and method for applying coating onto paper sheet.

SUBSTANCE: paper sheet of such structure may be used for manufacture of paper or plastic medium for carrying of printed information, paper or plastic package, cover used in stitching and binding processes, or cardboard or plastic carton having surface feeling hash to the finger. At least one side of paper sheet is coated with layer containing non-compressible microscopic particles of non-gelatinized starch grains, or said particles are produced by grinding of plastic material. Method involves treating at least one side of paper sheet with water-based composition containing non-compressible microscopic particles which are made three-dimensional and rounded, binder, and filler; drying paper sheet after treatment. Particles are non-gelatinized starch grains, or particles are produced by grinding of plastic material. Method allows paper sheet to be produced, which has roughness coefficient Kd below 0.5.

EFFECT: simplified method and improved quality of paper sheet.

17 cl, 16 dwg, 1 tbl, 3 ex

 

The present invention relates to the sheet, rough to the touch.

It also relates to a method of manufacturing such a sheet to the sheet.

The applicant was interested, in particular, a receiving sheet, which, not being very rough or abrasive, yet has a grainy, which can be felt only by touch, and its surface when it seems to the naked eye completely smooth.

As far as known to the applicant, study some roughness to the touch remains unexplored area in the paper industry, in the production of thin-film plastics in packaging or publishing in General.

This situation arose because until now, research in the above areas pursued the opposite goal - achieving softness of the sheet or characteristics of velvety.

Thus, in the patent FR 2791368 the applicant has protected the sheet, on which the touch is that it provides a specific description of the content returnable packaging and is suitable in particular for the packaging of cosmetic products.

The objective of the applicant is to develop a worksheet that rough, but pleasant to the touch, it is this, which does not cling to the skin drinking.

In addition, the sheets must be made with the possibility of printing on them, to have a prospect who signs white and be done with, for example, manipulating them.

The applicant conducted a search of the particles, allowing to achieve these goals.

The applicant has discovered two broad categories of particles:

those dominated by abrasive role and are ready to have microscopic configuration with corners and some uniform distribution on the surface of the sheet, such as particles of alumina or corundum; and

those who play the role of gaskets and elements, resistant to abrasion, and are ready to have a more rounded microscopic configuration and a three-dimensional form, such as particles of starch.

Conducting research with the aim of achieving the sheet roughness to the touch, the applicant focused on the use of particles from the last mentioned category, to reduce the extent possible the engagement of fingers skin drinking on the sheet with such a coating.

Found that the effect of roughness actually depends on several reasons:

particle size inherent to the used particles, that is, the distribution of their sizes;

forms used particle;

the number of precipitated particles; and

distribution of the used particles in the sheet.

Also discovered that the most preferred results are obtained by coating a sheet of paper or plastic layer of particles necessarity the CSOs starch, preferably, particles of potato starch.

Looking in the scanning electron microscope, it is easy to see that the grains of potato starch are almost spherical or oval in shape, have an average value of the size distribution, amounting to 28 micrometers, and consist of large, but not very many particles.

The applicant was also able to show that not all types of starch allow you to get "rough" to the touch, and in particular that the coating grains of corn starch does not give the desired sensation of roughness.

The explanation of this phenomenon based on the fact that the particles are small, their average diameter is less than 15 micrometers, and inherent in these particles the size distribution is differentiated is quite low.

Therefore, grain corn starch is distributed as a uniform layer, following the topography of the plate to which they are applied.

On the basis of these various analyses, the applicant made a number of findings, impose restrictions on the type of particles that can be used.

First, the particles must be large enough to be on the same level with the layer in accordance with the perception of the operator, taking the paper.

Next, the particles should not be too "policytype to feel some roughness was created, but it was pleasant.

In cha is in the surrounding area, for the desired purpose are not suitable grains of silica or alumina, such as those used for the manufacture of abrasives, as these particles have a geometry resulting from crushing, which is too "aggressive".

In a preferred embodiment, the particles will have a relatively spherical and three-dimensional geometry that eliminates the possibility of applying particles flocculent form, for example, talc.

And, finally, the particles should not be deformable.

Therefore, be unsuitable materials such as rubber or deformable microspheres substances due to their compressible and elastic nature, which leads to a receiving sheet, sticky to the touch, but not rough.

From this point of view some grain starches are presented to provide a possible solution due to their suitability to satisfy the above requirements, and also because of their cost, their availability in their natural state, as well as their suitability for recycling for recycling.

In particular, the invention relates to a sheet having the surface rough to the touch, at least on one of its sides, and the said sheet is coated on one or both sides with a layer containing an incompressible microscopic particles, which are bulky and have a rounded shape.

In particular, the invention is characterized in that the particles have a mass-average diameter that is greater than 25 micrometers, and preferably less than 200 micrometers.

In particular, the invention is characterized in that the particles are almost spherical in shape.

The particles preferably are grain neclaustridialnah starch, in particular grains of potato starch.

In accordance with one particular case, the particles can be made of glass microspheres or they can be shredded plastic and this plastic is preferably a polyamide, a complex polyester, polyolefin or polyvinyl chloride (PVC).

In particular, the invention is characterized by the fact that the distribution of the particles on the surface is in the range between 20 and 250 particles / mm2. This distribution can be defined, in particular, through topological analysis of the surface of the obtained sheet.

Weight of the obtained sheet preferably will be in the range between 50 and 500 g/m2.

In accordance with one specific embodiment, the mass layer on each coated side is in the range between 3 and 30 g/m2in terms of dry weight, and preferably in the range between 5 and 18 g/m2in terms of dry weight.

In particular, the invention differs in that amenity layer contains:

100 parts, calculated on the dry weight of the above-mentioned particle;

from 5 to 300 parts, preferably from 10 to 50 parts, calculated on the dry weight of the binder; and

from 0 to 500 parts, calculated on the dry weight of the fillers.

In particular, a binder selected from the best choice of latexes, acrylic latexes, vinyl latexes, soluble starch, polyvinyl alcohol, proteins, particularly casein, gelatin and soy protein, nitrocellulose, plastisol, glycerinated resins, epoxy resins, polyesters.

In particular, fillers selected from calcium carbonate, kaolin, talc, titanium dioxide, barium sulfate, precipitated or fumed silica, pigments plastics.

In the composition of the coating can also use other ingredients such as waxes, rheology modifiers, protivovspenivayushchie additives, substances that increase the wetting ability, bactericides or fungicides, etc.

These ingredients will not alter the surface structure of the material, and hence the resulting tactile effect.

In accordance with the latest specific embodiment the sheet has a coefficient of dynamic friction measured in accordance with standard NF Q 03-082 on blotting paper, accounting for less than 0.5.

The invention also relates to a method for coating sheet.

According to one particular variant of the method of coating sheet differs in that it includes the following stages, which are:

a) processes at least one side of the sheet composition in an aqueous medium containing:

100 parts of an incompressible microscopic particles, which are bulky and have a rounded shape;

from 5 to 200 parts, preferably from 10 to 50 parts, calculated on the dry weight of the binder;

from 0 to 500 parts, calculated on the dry weight of fillers;

b) dry the resulting list.

In accordance with one particular case of the method step a) is carried out with the use of the device for coating selected from the devices for roller coating, which belong to the heliocentric or reversal-roller type and correspond to devices for reversal-roll coating device for coating paper with sliding doctors, devices for coating, air-knife, presses for bonding by means of a film transport devices for coating watering.

In accordance with another particular case, the step a) is performed using napylyaemogo device.

In accordance with another alternative method of coating sheet differs in that it includes the following step is, on which:

a) cover at least one side of the sheet varnish containing:

100 parts of an incompressible microscopic particles, which are bulky and have a rounded shape;

from 5 to 200 parts, preferably from 10 to 50 parts, calculated on the dry weight of the binder;

from 0 to 500 parts, calculated on the dry weight of fillers;

b) dry the resulting list.

The invention also relates to the use of the sheet described above, for the manufacture of paper or plastic media, printed information, paper or plastic wrap, cover, designed for bookbinding processes, or cardboard or plastic boxes.

Below is an explanation of the present invention based on examples, followed by references to the relevant drawings.

On figa and 1B are shown obtained with a scanning electron microscope micrograph of a sheet of paper covered with grains of potato starch, with increased 50 times and 750, respectively.

On figs shows the same sheet, viewed in cross-section with increase in 1000 times.

On figa and 2B shows a sheet of paper covered with grains of corn starch with increased 50 times and 750, respectively.

On figs shows the same sheet, viewed in cross-section with increase in 1000 times.

On IgA and 3B shows a sheet of paper, covered with grains of potato starch and calcium carbonate as filler, with increased 50 times and 750, respectively.

On figs shows the same sheet, viewed in cross-section with increase in 1000 times.

On figa and 4B shows a sheet of paper covered with particles of silica, with an increase up to 50 times and 750, respectively.

On figs shows the same sheet, viewed in cross-section with increase in 1000 times.

Figure 5 shows a sheet of paper coated microspheres from a deformable plastic type EXPANCEL 820®supplied by the company Expancel, with increased 500 times.

Figure 6 shows a sheet of paper, coated with glass microspheres, with increased 500 times.

7 shows a sheet of paper covered with particles of alumina, with increased 500 times.

On Fig shown a sheet of paper covered with grains of wheat starch with increased 500 times.

As can be seen from the above, coating the paper with particles of potato starch, the applicant has successfully achieved the desired pleasant to the touch of roughness, while using grains of corn starch this result could not be reached.

By proper comparison figa, 1B and 2A, 2B, corresponding to the two aforementioned types of starch, revealed that the distribution, shape and size of grains help to explain this difference.

In the case of potatoes the CSOs starch the starch has a nonuniform distribution in the sheet, this small grain or aggregated around larger grains, or deposited on the sheet individually at random.

However, in the case of corn starch this distribution list is completely uniform, and the grains are relatively the same size and form on paper thin fine-grained layer.

Comparison pigs and 2C shows that will feel the finger of the operator, taking the paper, moving on the surface of the coated paper.

In the first case, the finger of the operator will often switch from depression to the ledge, the height that separates them, is at least 25 micrometers.

In the second case, the finger will move from one peak grain to another peak of grains, and the distance separating them is not more than 10 micrometers.

If it is less than about ten micrometers, the operator, taking the paper, it will be difficult to perceive the grain surface and to feel any roughness.

The applicant was also able to observe increased sensation of roughness by adding fillers, especially calcium carbonate.

Figa, 3B and 3C clearly illustrate this aspect of the invention, because they can see that there is a constant distribution of grains of potato starch, but the appearance of these grains is with the totally different.

In fact, the calcium carbonate particles which have a size that is close to one micrometer, cover the surface of the grains of starch, which consequently lose the smoothness of the surface and become more "catchy" at the touch.

Figa, 4B and 4C represent another case, deliberately included by the applicant in consideration, i.e. the case of paper covered with particles of silica, which configuration has the corners.

In particular, figs shown very policity and uneven particles of silica that is incompatible with a soft-touch finish.

Although the obtained sheet still has a low degree of roughness, that as he gains only at the expense of a small fraction of the silica particles added to it, and thus established low relief.

However, this feeling does not match a nice touch of roughness, which tried to reach the applicant.

In this regard, we note that figure 5 shows the surface of a sheet coated microspheres from a deformable plastic EXPANCEL type.

Inspection shows that these particles are mostly small and spherical.

Since large particles are few and they are relatively soft, the desired effect of roughness is not achieved.

In contrast, figure 6 shows the surface of the sheet, covered with glass and microspheres.

Even despite the fact that the distribution and shape of the microspheres on the sheet have some similarity with the previous case, we obtain the feeling is completely different due to the hardness inherent in the glass.

This feeling is really the sensation of roughness, not sticky, as in the previous case.

7 and 8 confirm the fact that is pleasant to the touch surface roughness cannot be obtained using alumina or wheat starch.

This is because in one case too "politie particles of alumina give too annoying surface, unpleasant to the touch.

In another case, wheat starch has a surface similar to the one you get by using corn starch; therefore, its rough character will almost be felt.

Below are examples of coating compositions of the present invention.

Example 1

The coating composition containing grains of potato starch, in the amount of 10.7 g/m2put on one side of the sheet of paper using a laboratory press for gluing.

The thus treated sheet was dried at a temperature of about 150°C.

The composition comprising the starch granules were obtained in the aquatic environment, and this composition contained in terms of dry weight:

100 hours is the capacity of potato starch HICAT 110, supplied by the company Roquette;

32 parts of ACRONAL latex S 305 D, supplied by BASF;

4,8 part of the pH stabilizer brand AMR 90, supplied by the firm Angus Chemie GmbH, and

6.7 parts of a thickening substance STEROCOLL D, supplied by BASF.

Was obtained sheet are shown in figa, 1B, 1C.

Example 2

The coating composition containing grains of potato starch and calcium carbonate as filler, in the amount of 22.5 g/m2put on one side of the sheet of paper using a laboratory press for gluing.

The thus treated sheet was dried at a temperature of about 150°C.

Composition containing corn starch and calcium carbonate, obtained in the aquatic environment, and this composition contained in terms of dry weight:

100 parts of potato starch HICAT 110 supplied by the company Roquette;

60 parts of calcium carbonate brand HYDROCARB 90, supplied by the company OMYA;

32 parts of ACRONAL latex S 305 D, supplied by BASF;

4,8 part of the pH stabilizer brand AMR 90, supplied by the firm Angus Chemie GmbH, and

6.7 parts of a thickening substance STEROCOLL D, supplied by BASF.

Was obtained sheet are shown in figa, 2B, 2C.

Example 3

The coating composition containing glass microspheres, in the amount of 47 g/m2put on one side of the sheet of paper using the laboratory is REGO press for gluing.

Composition containing glass microspheres, obtained in the aquatic environment, and this composition contained in terms of dry weight:

100 parts of glass microspheres in the form of material MICROPERL 050-20-215 available from 3M company;

20 parts of latex ACRONAL S 360 D, supplied by BASF, and

2.4GHz part of the condensing substance BLANOSE supplied by the company Aqualon.

Was obtained sheet are shown in Fig.6.

The applicant also tried to characterize pleasantly rough finished surface of the obtained sheet otherwise than inadvertently received tactile feeling of the operator, taking the paper, namely the method that is appropriate for the evaluation of such a subjective characteristics.

With regard to specific and unambiguous quantitative values, the applicant measured the coefficient of dynamic friction in accordance with French standard NF Q 03-082.

This standard is based on measuring the tractive effort required for the initiation and subsequent maintenance of the movement of one surface on another, you can apply for the assessment of sheet material whose characteristics measured during sliding on another (reference) material.

Therefore, conducting tests, the applicant has chosen as reference material absorbent paper having a weight of approximately 275 g/m2and meets the requirements of ISO 5269-1, slazhennym in his section 4.4.

The table shows the results of measurements carried out on different tracks when changing the input particles.

Based on these results we can assume that the coefficient of dynamic friction is higher, the more rough is received paper.

In fact, you can see that is pleasant to the touch roughness, sought by the applicant corresponds to a Kd of less than 0.5.

Consequently, it is possible to exclude such particles as thermally deformable microspheres from a material such as EXPANCEL, particles of alumina, grain, wheat starch or powdered rubber.

This confirms the observations made above.

Table
Particle typeMass media (g/m2)Coating weight (g/m2)The value of the friction coefficient, Kd
Potato starch249160,31
Potato starch + caso3249170,28
EXPANCEL12020,87
Glass microspheres249180,35
Powdered polyamide24912 0,41
Alumina249150,61
Wheat starch249130,31
Powdered rubber249310,97

1. The paper sheet having the surface rough to the touch, at least on one of its sides, having at least one side coated in a layer containing an incompressible microscopic particles, which are bulky and have a rounded shape, in which particles are grains neclaustridialnah starch or get them as a result of crushing plastic.

2. Paper sheet according to claim 1, in which the starch granules are grains of potato starch.

3. Paper sheet according to claim 1, in which the particles have a mass-average diameter, which is greater than 25 μm and less than 200 microns.

4. Paper sheet according to claim 1, in which the particles are almost spherical in shape.

5. Paper sheet according to claim 1, in which the distribution of particles on the surface is in the range between 20 and 250 particles / mm2.

6. The paper sheet of claim 1, wherein the sheet has a weight in the range between 50 and 500 g/m2.

7. The paper sheet of claim 1, wherein the mass layer on each coated side is in the range between 3 and 30 g/m2in baresch the ones on dry weight.

8. The paper sheet of claim 1, wherein the mass layer on each coated side is in the range between 5 and 18 g/m2in terms of dry weight.

9. Paper sheet according to claim 1, in which the dynamic friction coefficient, measured in accordance with standard NF Q 03-082 on blotting paper, is less than 0.5.

10. Paper sheet according to claim 1, in which the layer contains 100 hours, calculated on the dry weight of the above-mentioned particles; from 5 to 300 hours, calculated on the dry weight of binder, from 0 to 500 hours, calculated on the dry weight of the fillers.

11. The paper sheet of claim 10, in which the binder is selected from the best choice of latexes, acrylic latexes, vinyl latexes, soluble starch, polyvinyl alcohol, proteins, particularly casein, gelatin and soy protein, nitrocellulose, plastisol, glycerinated resins, epoxy resins, polyesters.

12. The paper sheet of claim 10, in which the filler is selected from calcium carbonate, kaolin, talc, titanium dioxide, barium sulfate, precipitated or fumed silica, plastic pigments.

13. Method of coating paper sheet having the surface rough to the touch according to claim 1, characterized in that it comprises the following stages, in which (a) is treated with at least one side of the sheet composition in an aqueous medium containing 100 PM incompressible micro is Kupechesky particles, which are bulky and have a rounded shape, and the particles are grains neclaustridialnah starch or get them as a result of crushing plastic; from 5 to 200 hours, calculated on the dry weight of binder, from 0 to 500 hours, calculated on the dry weight of fillers; b) dry the thus obtained sheet.

14. The method according to item 13, wherein step a) is carried out with the use of the device for coating selected from the devices for roller coating, which belong to the heliocentric or reversal-roll type devices for coating paper with sliding doctors, devices for coating, air-knife, presses for bonding by means of a film transport devices for coating watering.

15. The method according to 14, characterized in that step a) is performed using napylyaemogo device.

16. The method according to item 13, characterized in that it comprises the following stages, in which (a) cover at least one side of the sheet varnish containing 100 hours incompressible microscopic particles, which are bulky and have a rounded shape; from 5 to 200 hours, calculated on the dry weight of binder, from 0 to 500 hours, calculated on the dry weight of fillers; b) dry the thus obtained sheet.

17. The paper sheet p is claim 1 for the manufacture of paper or plastic media, printed information, paper or plastic wrap, cover, designed for bookbinding processes, or cardboard or plastic boxes, having the surface rough to the touch.



 

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12 cl, 5 dwg, 4 tbl, 3 ex

FIELD: pulp-and-paper industry, in particular, manufacture of paper which may be used for hygienic and household purposes.

SUBSTANCE: paper sheet consists of at least two layers of creped cellulose wool, upper and lower layers, said layers having weight within the range of 10-40 g/m2. Upper layer is embossed and equipped with primary projections divided along lines defining therebetween cells with surface within 1-20 cm2. Upper layer has longitudinal length exceeding that of lower layer by at least 0.6%, preferably by 0.6-2%, and is connected with said lower layer through apexes of primary protrusions so that pads are defined within cells. Method involves unwinding first band of cellulose wool from main bobbin; performing embossments on roll for providing embossment in accordance with pattern including primary projections forming lines which define closed cells therebetween; unwinding second band of cellulose wool from main bobbin; applying second band onto first band and connecting both bands through apexes of primary projections; winding resultant doubled band onto cartridge while applying tensile force; differentiating both bands in the process of joining so that at rest state length of both layers differs by at least 0.6%, preferably 0.6-2%; cutting resultant roll into smaller rolls.

EFFECT: increased convexity effect for simulating textile product.

10 cl, 3 dwg

FIELD: paper coated with composition for coating various kinds of paper, for offset printing of paper used for manufacture of books, magazines, annual reports, or packaging paper.

SUBSTANCE: composition comprises pigments and binder. Composition pigments are formed as microballs having sizes below 10 micrometers, preferably about 7 micrometers. Paper coated with such composition is silky by touch and has at least one surface coated with such composition, preferably both of its surfaces. This paper may be tracing paper.

EFFECT: improved quality of paper owing to preventing sliding thereof during separation of sheets in stacks, delamination of coating during printing process and, accordingly, elimination of paper dusting and formation of impure imprints.

7 cl, 2 dwg, 2 tbl, 13 ex

FIELD: paper coated with composition for coating various kinds of paper, for offset printing of paper used for manufacture of books, magazines, annual reports, or packaging paper.

SUBSTANCE: composition comprises pigments and binder. Composition pigments are formed as microballs having sizes below 10 micrometers, preferably about 7 micrometers. Paper coated with such composition is silky by touch and has at least one surface coated with such composition, preferably both of its surfaces. This paper may be tracing paper.

EFFECT: improved quality of paper owing to preventing sliding thereof during separation of sheets in stacks, delamination of coating during printing process and, accordingly, elimination of paper dusting and formation of impure imprints.

7 cl, 2 dwg, 2 tbl, 13 ex

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