JP4772031B2 - Anti-slip paperboard - Google Patents

Description

  The present invention relates to an anti-slip paperboard that is excellent in both conflicting properties of anti-slip properties and wear resistance, does not cause load collapse (load slip), and does not cause discoloration.

  Various foods such as agricultural products and marine products, or various industrial products are packaged and transported in paper containers such as cardboard and cartons and various paper bags.

  In recent years, the efficiency of logistics has been improved by automating various packaging lines and making pallets for transportation lines. At that time, if cardboard cases etc. slip, cargo collapse occurs, which is very dangerous and the efficiency of transportation This is the cause of the decline.

  Therefore, conventionally, such paper containers and paper bags have been provided with slip resistance to prevent slippage. As such a method, after printing a pattern with water-based printing ink, an anti-slip agent having adhesiveness (hereinafter referred to as “adhesive type anti-slip agent”) is applied, and the anti-slip property is imparted by the adhesive force. A non-adhesive anti-slip agent to form a film with unevenness on the surface of a paper container, etc., and this unevenness is physically engaged to impart anti-slip properties, or silica or other anti-slip filler is applied to the surface layer. A typical method is to impart anti-slip properties by coating.

  However, with the adhesive type anti-slip agent, the higher the anti-slip effect, the more likely it is that blocking will occur on the contact surface, and there will be problems such as dirt and dust adhering during transportation and soiling of the printed matter. Slip resistance, blocking resistance and antifouling properties could not be obtained at the same time. Furthermore, since the adhesive type anti-slip agent is sensitive to heat, after the anti-slip agent is applied to the surface of the paperboard, the anti-slip agent is taken on the corrugated machine's hot plate and fouled when pasted on the corrugated board There's a problem.

  Moreover, as shown in Patent Document 1, non-adhesive thermally foamed particles are coated on the surface to form a film with irregularities on the surface of a paper container or the like, and the irregularities are physically engaged to provide anti-slip properties. However, this method has a problem that paper jam occurs because the base paper does not slip during lamination after cutting in a corrugated machine for corrugated board processing because it becomes too slippery.

  On the other hand, as shown in Patent Document 2, an anti-slipping agent such as silica can be expected to have a certain initial anti-slipping effect and heat resistance. However, when re-loading and the like are repeated, the contact surfaces are rubbed together to prevent slip There was a strong tendency for the effect to decrease extremely, and the durability of the anti-slip effect was lacking. Further, in order to increase the anti-slip effect, it is necessary to contain a large amount of inorganic particles and the like, but there are many problems such as a decrease in friction resistance, a whitening of the anti-slip agent and a lack of cosmetics on the printed surface due to a decrease in gloss. Had a problem.

Japanese Patent Laid-Open No. 10-204797 Japanese Patent No. 3585749

  The present invention has been made in view of the above-described circumstances, and the object thereof is excellent in both contradictory properties such as slip resistance and wear resistance, and does not cause load collapse (load slip). And it is providing the anti-slip board which does not generate | occur | produce discoloration even if it is colored deeply.

The object of the present invention is an anti-slip paperboard in which the base paper is composed of a single layer or a plurality of layers, and at least the surface of the base paper is colored, and at least the surface of the base paper is colored. And applying a coating layer containing at least a thermally foamable resin and a pigment to at least one side of the base paper to provide a coating layer, and drying the coated layer to foam the thermally foamable resin. The surface of the base paper is used as a non-slip layer, and the coating liquid is applied in a solid content of 0.65 to 6.15 g / m ² per side , and the pigment is applied in the coating liquid in a solid content. 5 to 30% by mass, the pigment has an average particle diameter of 10 to 30 μm, a sliding angle by a tilt method specified in JIS-P8147 is 45 to 55 degrees, and a dyeing fastness test specified in JIS-L0894 Wear resistance by JIS-L0805 It is achieved by providing a non-slip paperboard, characterized by using a contamination grayscale for the constant to be 4 or higher grade.

Furthermore, the above object of the present invention is more effective by providing a non-slip paperboard characterized in that the surface roughness test height (Ry) specified in JIS-B0601 is 15.5 to 18.5 μm. Is achieved.

  According to the anti-slip board according to the present invention, on at least one side of the base paper, a coating layer containing at least a thermally foamable resin and a pigment is applied to provide a coating layer, and the coating layer is dried. Since the thermally foamable resin is foamed and the surface of the base paper is used as an anti-slip layer, it is possible to satisfy both conflicting properties such as excellent anti-slip properties and excellent wear resistance.

  The anti-slip board according to the present invention will be described in detail below. Needless to say, the anti-slip paperboard according to the present invention is not limited to the following embodiment, and can be appropriately changed without departing from the scope of the claims.

  The anti-slip paperboard according to the present invention (hereinafter referred to as “the anti-slip paperboard”) comprises a base paper with two layers of a surface layer and a back layer, and at least a layer (surface layer in the present embodiment) which becomes the surface of the base paper It contains a colorant and colors at least the surface of the base paper.

  The raw material pulp used for the base paper of this anti-slipboard is mainly wood fiber such as hardwood bleached kraft pulp, softwood bleached kraft pulp, hardwood unbleached kraft pulp, softwood unbleached kraft pulp, hardwood sulfite pulp, conifer sulfite pulp, etc. Pulp and chips that have been chemically treated as a raw material, or ground pulp that has been mechanically pulped from pulp and chips that have been chemically treated using non-wood fibers such as kenaf, hemp, and straw as raw materials other than wood Chemipulp pulp mechanically pulped with chemicals added to wood or chips, and virgin pulp and kraft pulp such as semi-chemical pulp cooked until refined and then refined with refiner etc., semi-chemical Pulp, de-inked, bleached pulp from office waste including pulp and enzyme bleached pulp, Non-printed paper such as high quality cut paper, coated paper, coated white, special white, medium white, etc. Non-printed, lottery paper, new stage, newspaper, craft envelope, imitation, recovered pulp obtained from used paper in magazines, etc. Can do. In addition, there is an advantage that an environmental load is reduced when much waste paper pulp is used.

  As a colorant for coloring at least the surface of the base paper, a basic dye having a beautiful color and a high color density can be used together with an anionic direct dye or a cationic direct dye. In addition, when two or more of these dyes are added, the order of addition of the dyes is that an anionic direct dye is added at an early stage, and after adjusting the pH by adding a sulfuric acid band, a basic dye and necessary for it are added. It is preferable to add a cationic direct dye having a high speed dyeing property near the inlet, high exhaustibility, good water fastness and good fastness to sunlight. Furthermore, by adding a pigment, it is possible to realize coloring with a deeper color and higher weather resistance. Various known pigments can be used as the pigment.

  In addition, the colored anti-slip board has a color fading problem because the colored L surface has a lightness L value of 60 or less based on JIS-Z8722 and JIS-Z8730. Therefore, the effects of the present invention are further exhibited.

Further, in the production of the anti-slip paperboard, a known sizing agent such as an acidic rosin sizing agent, a neutral rosin sizing agent, or an alkyl ketene dimer is internally added in order to prevent discoloration of a layer colored with a coloring agent such as a dye. by, 15~150g / ^{m 2} measured water absorption according to JIS-P8140 is a contact time of 120 seconds, it is preferably adjusted preferably so that 30 to 100 g / ^{m 2.} If the water absorption is less than 15 g / m ² , the coating liquid described later cannot be uniformly applied in the subsequent coating liquid coating step, resulting in uneven color fading prevention effects. On the other hand, when the water absorption exceeds 150 g / m ² , the applied coating liquid penetrates into the base paper, and the effect of applying the coating liquid is reduced.

  The paper making method for the anti-slip paperboard is not particularly limited, and any of acid paper making method, neutral paper making method and alkaline paper making method may be used. Also, the paper machine is not particularly limited, and various known paper machines such as a long net paper machine, a twin wire paper machine, a circular net paper machine, and a short net combination machine can be used. .

  A coating containing at least a heat-foamable resin and a pigment is applied to at least one surface (at least one side) of the base paper of the anti-slip paperboard, which has been colored and made as described above, in the coating step after the dryer of the paper machine. A coating layer is provided by coating or applying a working solution. Thereafter, the thermally foamable resin is expanded by drying the coating layer, and irregularities are formed on the surface of the base paper to form an anti-slip layer.

  Thereby, the slip resistance and abrasion resistance (fastness of dyeing) of this slip resistant paperboard can be improved. That is, since the slip angle is high, no load slip occurs even when the anti-slip paperboard is processed into a case (for example, a beer case) used for heavy objects. Further, even with the present anti-slip board colored in a dark color, it is possible to prevent the occurrence of color fading due to friction, so that the color does not transfer to clothing or other paper. Furthermore, since the coating layer of the antiskid paperboard is formed by applying a coating liquid containing a heat-foamable resin, etc., it has elasticity like rubber, so when the antiskid paperboard is folded and processed Occurrence of surface cracks and ruled line cracks can be prevented. Specifically, the abrasion resistance (dyeing fastness) according to the dyeing fastness test specified in JIS-L0849 can be graded 4 or higher by using the gray scale for contamination specified in JIS-L0805. Note that if the dyeing fastness is less than the fourth grade, color fading may occur due to friction, and the color may be transferred to clothing or other paper that comes into contact.

  The heat-foamable resin that can be used for the anti-slip paperboard is composed of heat-foamable particles in which a low-boiling solvent is encapsulated in a fine particle outer shell composed of a thermoplastic synthetic resin and an ethylene-vinyl acetate binder. Is. The thermally foamable particles have an average particle diameter of 5 to 30 μm, and expand by 4 to 5 times in diameter and 50 to 130 times in volume when heated at 90 to 200 ° C.

  Examples of the thermoplastic synthetic resin constituting the outer shell include copolymers such as acrylonitrile, vinylidene chloride, acrylic acid ester, and methacrylic acid ester.

  Examples of the low boiling point solvent enclosed in the outer shell include isobutane, pentane, petroleum ether, hexane, low boiling point halogenated hydrocarbon, and methylsilane.

  As a thermally foamable resin, a new die form manufactured by Dainichi Seika Kogyo Co., Ltd., for example, W-111, W-211, W-301, W-350, W-400, W-40NF, W-46NF, W-480 , W-484, W-48NF, W-494, W-501, S-501, S-612 (product names) and the like can be used.

  Thermally foamable particles are heated above the softening point of the thermoplastic synthetic resin that constitutes the outer shell, and at the same time, the low-boiling solvent encapsulated is vaporized, the vapor pressure rises, the outer shell expands, and the particles expand. During expansion, the internal pressure and the tension / external pressure of the shell are balanced to maintain the expanded state. The thermally foamable particles are generally expanded to this state and used as a lightening agent, a bulking agent, a cushioning agent, a heat insulating agent and the like. If additional heat is applied to the expanded thermally expandable particles, the gas permeates and diffuses from the expanded and thinned shell, and the tension and external pressure of the shell become larger than the internal pressure. As a result, the foamed particles shrink.

  Therefore, the thermally foamed particles used in the anti-slip paperboard are foamed by a dryer in the drying process. Generally, the temperature of the paper drying process is about 130 ° C. The starting temperature is preferably a low temperature expansion type foaming at 100 to 130 ° C. That is, if the expansion start temperature is a heat-expandable particle having a temperature of less than 100 ° C., when expanded by a dryer in the drying process, the expanded particle once again contracts as described above, and irregularities on the paper surface are formed. Therefore, it becomes difficult to provide the anti-slip function to the anti-slip board. On the other hand, when the expansion start temperature exceeds 130 ° C., there arises a problem that the heating temperature in the drying / foaming process and foaming failure due to insufficient heat quantity are generated. Further, in order to obtain an appropriate heating temperature and amount of heat, it is necessary to significantly reduce the manufacturing speed, and the production efficiency is lowered.

  The pigment is preferably blended in a solid content of 5 to 30% by mass, more preferably 15 to 25% by mass. This makes it possible to control the slip resistance of the anti-slip paperboard, and to suppress the occurrence of a paper jam when the anti-slip paper board is processed into corrugated board or when the sheet travels during bag making. In addition, by incorporating a pigment in the coating liquid, the wear resistance can be further improved, color fading can be prevented more easily, and a suede-like texture that gives a high-class feel different from ordinary paper. Can be given.

  Specifically, the slip angle by the tilt method specified in JIS-P8147 can be 45 to 55 degrees, preferably 48 to 52 degrees. If the sliding angle is less than 45 degrees, the slip resistance is low, and if the cardboard case slips during distribution using a pallet or the like on the transportation line, the load collapses. On the other hand, when the slip angle exceeds 55 degrees, the paper does not slip when the corrugator processes the cardboard sheet in the final process of up stacker or bag making processing, and paper jam occurs frequently.

  If the pigment content is less than 5% by mass, the slip resistance will be too high, and paper jams may occur when the corrugator is used to process the cardboard sheet in the final process up stacker or when the sheet travels during bag making. There is. On the other hand, when the blending amount of the pigment exceeds 30% by mass, the slip resistance and dyeing fastness cannot be improved to the desired values of the present application, and discoloration occurs due to friction, and contacted clothing or other paper The color may move.

  Furthermore, the pigment contained in the coating liquid used for the anti-slip paperboard has an average particle diameter of 10 to 30 μm, preferably 15 to 25 μm. Thereby, while improving anti-slip property, it is excellent in the processability of a corrugated cardboard and a bag making process, and also can improve the dyeing fastness. That is, it is possible to satisfy both the anti-slip property (hardness to slip) and the contradictory properties of no color fading.

  As pigments, talc, calcium carbonate, kaolin, calcined kaolin, zinc oxide, aluminum hydroxide, zinc sulfide, titanium dioxide, calcium sulfate, calcium sulfite, barium sulfate, satin white, silica, etc. are mainly necessary. Accordingly, an organic pigment called a plastic pigment can be used as appropriate.

  Among these pigments, talc is particularly preferably used in the present invention from the viewpoint of the particle diameter of the pigment that controls the sliding angle. Specifically, general-purpose talc series SW, SWE, MS, MS-D of Nippon Talc Co. can be used.

As described above, the coating liquid containing at least a heat-foamable resin and a pigment has a solid content of 0.65 to 6.15 g / m ² , more preferably 1.3 to 3.9 g / m ² per side. ² Apply. As a result, it is possible to give a sense of suede-like material with a sense of quality different from that of ordinary paper. By using this anti-slip paperboard for cardboard cases and shopping bags, it is possible to obtain a high-quality image.

When the coating amount is less than 0.65 g / m ² , unevenness due to the heat-foamable resin cannot be formed on the base paper surface, and the desired anti-slip property of the present invention cannot be obtained. Further, a suede-like material feeling having a high-quality feeling different from that of general paper cannot be obtained. On the other hand, when the coating amount exceeds 6.15 g / m ² , a texture different from that of paper can be obtained, but the final stack of corrugated sheets processed by the corrugator and the sheet at the time of bag making processing Paper jams may occur during travel.

  Thereby, the surface roughness (Ry) by the surface roughness test prescribed | regulated to JIS-B0601 can be 15.5-18.5 micrometers for this anti-slip board. In addition, when the surface roughness is less than 15.5 μm, the difference in height of the formed unevenness is reduced, so that a material feeling that gives the user a high-grade sensation different from ordinary paper cannot be obtained. On the other hand, when the surface roughness exceeds 18.5 μm, the difference in height (unevenness) in the surface roughness becomes high, and a texture different from that of paper can be obtained, but the slip angle becomes too high, and a corrugator is used to corrugate the cardboard sheet. There is a possibility that a paper jam will occur when the sheet is run during the up stacker or bag making process in the final process.

  Moreover, the coating liquid mentioned above can be apply | coated and coated on the surface of a base paper by well-known methods, such as a calendar coating, a bar coater, a rod coater, an air knife, a gate roll coater, and 2 roll size press. Moreover, it can also print by well-known printing means, such as a gravure printing machine and a flexographic printing machine. Among these, a rod coater that can arbitrarily change the coating amount of the coating liquid, can be applied uniformly, and can easily form a film is preferable. In addition, calendar coating is also preferable from the viewpoint of easy use of existing equipment, easy film formation, and easy adjustment of the coating amount by changing the coating concentration.

  In addition, there is also an advantage that the yield of chemicals is improved by applying the coating liquid to at least one side of the base paper in the coating process after the dryer as compared with the method of internally adding a heat-foamable resin.

  As described above, at least one surface of the base paper is coated with a coating solution containing at least a thermally foamable resin to form a coating layer, and the coated layer is dried with a dryer to foam the thermally foamable resin. The anti-slip board is formed by forming an anti-slip layer on the surface of the base paper.

  Furthermore, the anti-slip paperboard formed as described above has a surface strength of 18 A or more according to the surface strength test specified in the wax pick test method of JIS-P8129. If the surface strength is less than 18A, when the surface of the paperboard is rubbed, the colored fibers may be peeled off due to friction and discolored, and the color may be transferred to clothing or other paper that comes into contact. In addition, unlike the conventional paperboard coated with an anti-slip agent, the anti-slip paperboard does not deteriorate the anti-slip property even when heated by the corrugator's hot plate because the heat-foamable resin has heat resistance. .

  This anti-slip board has a high-quality suede-like texture that is different from ordinary paper, so it is used for cardboard cases that require a high-quality appearance, for transport packaging applications such as shopping bags, and other various packaging applications. be able to.

  As described above, the anti-slip paperboard according to the present invention has been described with respect to the case where the base paper is composed of two layers of the front layer and the back layer. The middle layer may be composed of a plurality of layers and may be composed of four or more layers, and the base paper may be composed of a single layer.

  In order to confirm the effect of the anti-slip paperboard according to the present invention, the following various samples were prepared, and a test for evaluating the quality of each sample was performed. In addition, in a present Example, the numerical value which shows a mixing | blending, a density | concentration, etc. is a numerical value of solid content or the mass reference | standard of an active ingredient. Moreover, since the pulp, chemical | medical agent, etc. which are shown in a present Example are only examples, it cannot be overemphasized that this invention is not restrict | limited by these Examples, and can be selected suitably.

For comparison with 21 types of anti-slip board according to the present invention (referred to as "Example 1" to "Example 21 ") and these Examples 1 to 21 , six types of anti-slip paperboard ( This is referred to as “Reference Example 22” through “Reference Example 27”), and four types of paperboard (referred to as “Comparative Example 1” through “Comparative Example 4”) are prepared as shown in Table 1. did. Hereinafter, Example 22 to Example 27 will be read as Reference Example 22 to Reference Example 27, respectively.

[Example 1]
<Surface>
A raw material slurry for surface layer is prepared by blending 40% by mass of hardwood bleached kraft pulp (LBKP, freeness 450 ml CSF) and 60% by mass of high-quality waste paper pulp (freeness 350 ml CSF). Agent and sizing agent were added. In addition, as a coloring agent, the anionic direct dye of "TOA red 2BP" (made by Toa Kasei Co., Ltd.) and "Carta violet 3B70" (made by Clariant Japan Co., Ltd.) was used. Moreover, the addition amount of the coloring agent was adjusted so that the hue of the surface layer based on JIS-Z8722 would be (L, a, b) = (58.0, 34.0, 0.6). A sulfuric acid band was used as a fixing agent, and 4.0% by mass was added. Moreover, the acidic rosin sizing agent was used as a sizing agent, and 0.4 mass% was added.
<Middle layer>
The raw material slurry for the middle layer was prepared using 100% by mass of old paper waste paper pulp (freeness 430 ml CSF).
<Back layer>
Using 100% by mass of old paper pulp (freeness 430 ml CSF), a raw material slurry for the back layer was prepared, and a fixing agent and a sizing agent were added to the raw material slurry for the back layer. A sulfuric acid band was used as a fixing agent, and 4.0% by mass was added. Further, an acidic rosin sizing agent was used as a sizing agent, and 0.25% by mass was added.
Using these raw material slurries, a surface layer, a middle layer and a back layer of raw material slurries are made using a circular five-layer paper machine, and a base paper having a five-layer structure with a basis weight of 170 g / m ² is used. Paperboard was made.
<Adjustment of coating solution>
First, a new die foam (W-40NF, foaming temperature: 120 ° C., manufactured by Dainichi Seika Kogyo Co., Ltd.) was added as a heat-foamable resin, and the solid content concentration was 15%. 20% by mass of talc (SW) (average particle size: 20 μm) manufactured by Talc Co., Ltd. was added to prepare a coating solution.
The coating solution prepared in this way is applied to the surface of the surface layer of the base paper colored with 1.95 g / m ^{2 in} solid content and coated with a dye in the coating part after the pre-dryer to form an after-dryer Then, the thermally foamable resin was foamed to form a non-slip layer on the surface of the base paper. Thereafter, a non-slip board was colored by calendaring with a machine calendar.

  (Examples 2 to 5) Anti-slip paperboard obtained in the same manner as in Example 1 except that the coating amount of the coating solution was changed as shown in Table 1.

  (Examples 6 to 7) Anti-slip paperboard obtained in the same manner as in Example 1 except that it was changed to a thermally foamable resin having the foaming temperature shown in Table 1.

  (Examples 8 to 11) Anti-slip paperboard obtained in the same manner as in Example 1 except that the amount of pigment added to the coating solution was changed as shown in Table 1.

  (Example 12) An anti-slip paper board obtained in the same manner as in Example 1 except that the coating amount of the coating liquid and the addition amount of the pigment were changed as shown in Table 1.

  (Examples 13 to 16) Anti-slip paperboard obtained in the same manner as in Example 1 except that the average particle size of the pigment added to the coating solution was changed as shown in Table 1.

  (Example 17) An anti-slip board obtained in the same manner as in Example 1 except that calcium carbonate was used as a pigment.

  (Examples 18 to 21) Anti-slip paperboard obtained in the same manner as in Example 1 except that calcium carbonate was used as the pigment and the addition amount of the pigment was changed as shown in Table 1.

  (Examples 22 to 23) Anti-slip paperboard obtained in the same manner as in Example 1 except that the coating amount of the coating liquid was changed as shown in Table 1.

  (Examples 24 to 25) Anti-slip paperboard obtained in the same manner as in Example 1 except that the amount of pigment added to the coating solution was changed as shown in Table 1.

  Examples 26 to 27 Anti-slip paperboard obtained in the same manner as in Example 1 except that the average particle diameter of the pigment blended in the coating solution was changed as shown in Table 1.

  (Comparative Example 1) Anti-slip paperboard obtained in the same manner as in Example 1 except that the coating solution was not applied.

  (Comparative Example 2) An anti-slip paper board obtained in the same manner as in Example 1 except that the coating liquid did not contain a pigment.

  (Comparative Examples 3 to 4) Except that the heat-foamable resin was not added to the coating liquid and the type of pigment added to the coating liquid was changed as shown in Table 1, the same as in Example 1 Obtained anti-slip paperboard.

  Quality evaluation for all examples and comparative examples, ie brightness of anti-slip board (all layers), sliding angle before corrugator (hot plate) of corrugating machine, sliding angle after corrugator (hot plate) of corrugating machine, dyeing fastness Evaluation tests were conducted on the degree, surface strength, surface roughness, tactile sensation, slip resistance, running performance, and disaggregation. The results are shown in Table 2. This quality evaluation was performed under environmental conditions of a temperature of 23 ± 2 ° C. and a humidity of 50 ± 2% in accordance with JIS-P8111.

  “Lightness” in Table 2 is the value of lightness (L value) measured based on JIS-Z8722 and JIS-Z8730.

  The “slip angle (degree) before the corrugator” evaluates the effect of anti-slip property, and is a value of the slip angle by the tilt method defined in JIS-P8147.

  In addition, “slip angle after corrugator (degree)” is to evaluate the effect of anti-slip after the paperboard contacts a hot plate that dries the paste when corrugating machine the paperboard related to each sample, It is the value of the slip angle by the tilt method specified in JIS-P8147.

  “Dye fastness (grade)” is an evaluation of abrasion resistance, that is, ease of color fading, and is subjected to a dye fastness test against friction in accordance with JIS-L0849. This is a value obtained by measuring the coloring grade using the gray scale for contamination specified in 1.

  “Surface strength (A)” is a value obtained by measuring the strength of the anti-slip paperboard of each sample according to the wax pick test method of JIS-P8129.

  “Surface roughness (μm)” is a measurement of the difference in level of unevenness formed on the surface of each sample, and evaluates whether or not it has a texture different from that of paper. The surface roughness measuring instrument SJ-201P is used, and it is a high and low value (Ry) measured according to JIS-B0601.

Furthermore, the “feel of touch” is a suede-like material feeling having a high-class feeling different from that of general paper, and is evaluated with tentacles. The evaluation criteria were the following three levels.
(Evaluation criteria)
A: Suede-like feel with a sense of quality completely different from paper.
○: It has a high-quality feel different from paper.
X: A touch feeling equivalent to that of paper.

The “anti-slip property” is an evaluation of the slipperiness of the cardboard case when the anti-slip paperboard of each sample is processed into a cardboard case and the cardboard cases are laminated. The evaluation criteria were the following three levels.
(Evaluation criteria)
A: The cardboard case is not slippery and does not collapse.
○: The cardboard case slips slightly, but no load collapse occurs.
X: The cardboard case slips and the load collapses.

“Running” is a visual evaluation of clogging of a bag when the bag is run after the paperboard of each sample is processed into a bag. The evaluation criteria were the following three levels.
(Evaluation criteria)
A: Bag clogging does not occur.
○: The bag looks a little clogged, but there is no problem.
X: The bag does not slip and clogging occurs.

Furthermore, “disaggregation” is an evaluation of whether each sample can be recycled (recycled). In the test method, each sample is dispersed for 1 minute by a standard disintegrator and disaggregated to obtain a slurry, and a handsheet is prepared using the slurry. It is visually evaluated whether or not there is an undissolved anti-slip board on the handsheet. The evaluation criteria were the following three levels.
(Evaluation criteria)
A: No undissolved anti-slip paperboard is not seen at all.
○: Undissolved anti-slip paperboard is hardly seen.
X: Unseparated anti-slip paperboard is scattered.

表２に示すように、本発明に係る防滑板紙であると品質評価に優れることが分かる。すなわち、実施例１〜２７に係る防滑板紙は、基紙表面が紙とは異なる触感を有し、有効な防滑性を有し、さらにまた耐摩耗性に優れ、色落ちしないことがわかる。

As shown in Table 2, it can be seen that the anti-slip board according to the present invention is excellent in quality evaluation. That is, it can be seen that the anti-slip board according to Examples 1 to 27 has a tactile sensation different from that of the paper on the base paper surface, has an effective anti-slip property, is excellent in abrasion resistance, and does not lose color.

Claims (2)

The base paper is composed of a single layer or a plurality of layers, contains a colorant in at least a layer that becomes the surface of the base paper, and is a slip-proof paperboard in which at least the surface of the base paper is colored,
On at least one side of the base paper, a coating layer containing at least a thermally foamable resin and a pigment is applied to provide a coating layer, and the thermally foamable resin is foamed by drying the coating layer. The surface of the base paper is an anti-slip layer ,
The coating solution is applied at a solid content of 0.65 to 6.15 g / m ² per side ,
The pigment is blended in the coating solution in a solid content of 5 to 30% by mass,
The pigment has an average particle size of 10 to 30 μm,
The sliding angle by the tilt method specified in JIS-P8147 is 45 to 55 degrees,
A non-slip paperboard characterized in that the abrasion resistance according to the dyeing fastness test specified in JIS-L0894 is grade 4 or higher using a contamination gray scale specified in JIS-L0805 . The anti-slip paperboard according to claim 1, wherein the surface roughness test according to JIS-B0601 has a height (Ry) of 15.5 to 18.5 µm .