JP2010031421A - Multi-ply packaging paper having suede-like appearance - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a suede-like multi-ply packaging paper producible at a low cost, having suede-like appearance and touch different from those of ordinary paper and suitable for bag-making use or packaging use in spite of using paper, having high antislipping property and score crack resistance, and especially suitable for bag making use. <P>SOLUTION: The multi-ply packaging paper having suede-like appearance is produced from a multi-ply packaging paper having a base paper composed of at least two paper layers including a front layer and a back layer by coating the surface of at least the front layer of the paper with a water-dispersed resin containing resin particles, thereby forming a coating layer on the surface. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a multilayer paper having a suede-like appearance, having a suede-like feel and excellent cosmetics, and particularly suitable for bag making.

  Handbags such as shopping bags, square bottom bags for miscellaneous goods and food, packaging paper used for envelopes, etc., or wrapping paper used as product packaging, can be printed directly on paper or multilayer paper with appropriate designs and patterns Manufactured by doing. Recently, there is a tendency that a high-quality feeling is also preferred for bag-making base paper and corrugated base paper, and accordingly, not only the appearance but also the tactile feeling of good quality or an unusual one have been demanded.

  One of high-quality paper or multilayer paper has a suede appearance. Suede tone means that the back of the leather is brushed with sandpaper in a velvet shape (a soft fabric with fluff on the surface) and the hair is raised.

  Conventionally, the following is known as a manufacturing method of the material which has such a suede appearance.

  For example, in Patent Document 1, an aqueous resin composition mainly composed of a binder composed of an acrylate copolymer emulsion containing a heat-sensitive agent and a foam stabilizer is foamed by stirring, for example, with a high-speed propeller mixer. After forming a composition layer on the entire surface of the substrate by stamping or coating, the composition layer is heated in a wet state, gelled and dried in a foamed state, and thereby a three-dimensional pattern that is porous, light and has a good texture There is disclosed a method for producing a material having a suede-like appearance in which a layer is obtained and the three-dimensional pattern layer is embossed by an embossing roll or the like, or a suede-like three-dimensional pattern is formed by sanding.

  However, in this method, at the stage of adjusting the aqueous resin composition to be applied or screen-printed, it is necessary to adjust the viscosity and to make bubbles (foaming) with a stirrer, and equipment for adjusting the coating liquid is required And requires manufacturing time. In addition, in order to obtain a suede-like appearance, the aqueous resin composition is gelled after coating, in the examples, heat drying is performed for 10 to 15 minutes, and the obtained three-dimensional resin film surface is sanded with sandpaper. As a result, there is a problem that the operability is poor and the manufacturing time increases and the manufacturing cost increases. Moreover, when processed as a bag making application, there is a defect in folding suitability, which deteriorates the processing efficiency.

  Further, for example, in Patent Document 2, in a decorative material in which at least one of an intermediate layer and a surface layer of a base material includes an expanded layer and a skin layer, microcapsules thermally expanded in a polymer are dispersed in the expanded layer. The skin layer contains at least one of urethane beads, silicon beads, and silicone oil, so that the surface irregularities have a fine and fine appearance, and also have a soft feel and are matte. In addition, a decorative material having a moist suede-like outer surface and a method for manufacturing the decorative material have been proposed.

  However, in this method, it is necessary to disperse and coat thermally expandable microcapsules on the surface of the paper, and to apply a coating liquid containing at least one of urethane beads, silicon beads, and silicone oil. For such coating, since the coating material used as the primer is preferably diluted with an organic solvent, the coating equipment must be explosion-proof. In addition, due to VOC regulations accompanying the Air Pollution Control Law, there is a problem that factory equipment is required to meet the VOC emission standards, and equipment costs are incurred. Furthermore, since suede-like paper is processed by bag-making companies, printing companies, and cardboard companies, there is a restriction that there should be no problems in terms of operability and transportability due to slipping of paper or paperboard. is there.

  In Patent Document 3, a paint film containing a bead pigment is applied to a plastic auxiliary film having heat resistance and solvent resistance to form a coating film. There has been proposed a method for producing a wrapping paper that maintains a suede-like appearance by laminating on paper suitable for packaging.

  However, this method requires a secondary process for attaching a suede-like film to paper or paperboard, which increases the number of steps and manufacturing time and increases the manufacturing cost. Moreover, since it is difficult to separate paper and film from a film-bonded product, there is a problem that it is difficult to recycle as used paper. Furthermore, even if an attempt is made to obtain a suede-like appearance by directly applying to a paper using a paint containing a pigment particle in the form of a bead pigment coated with a synthetic resin, the right column on page 1 of Patent Document 3 As can be seen from the above description, it has been difficult to produce a multilayer paper wrapping paper having a suede-like appearance by applying a coating solution containing a synthetic resin in the form of grains to paper. It was.

Japanese Patent Publication No. 8-30307 Japanese Patent No. 3778663 JP-A-4-144743

  The present invention has been made in view of the above-described circumstances, and the object of the present invention is a general product suitable for bag making use or packaging use while being a paper product that can be produced at low cost. A multi-layered wrapping paper that has a suede-like appearance that is suitable for bag making, and that has a suede-like appearance and feel that is different from typical paper, and that has both high slip resistance and resistance to ruled line cracking. Is to provide.

  The object of the present invention is to provide a water-dispersed resin containing resin particles at least on the surface of the surface layer in a multilayer paper wrapping paper in which the base paper is composed of at least two paper layers, a surface layer and a back layer. This is achieved by providing a multilayer paper wrapping paper having a suede-like appearance, characterized in that a coating layer is formed by coating.

Another object of the present invention is to provide a multilayer paper wrapping paper having a suede-like appearance, wherein the resin is coated in a weight solid content of 0.9 to 12.0 g / m ² per side. By providing, it is achieved effectively.

  In addition, the above object of the present invention is achieved more effectively by providing a multi-layered wrapping paper having a suede-like appearance, wherein the resin particles have an average particle diameter of 4 to 20 μm. The

  In addition, the object of the present invention is that the sliding angle measured in accordance with the sliding angle test of JIS-P8147 (1994) is 19 degrees or more, and in accordance with the surface roughness test of JIS-B0601 (1994). This is achieved more effectively by providing a multi-layered wrapping paper having a suede-like appearance characterized in that the measured elevation (Ry) is 21 μm or less.

Furthermore, the above object of the present invention is a suede characterized in that the density measured according to the thickness and density test method of JIS-P8118 (1998) is 0.35 to 0.93 g / cm ^3. This is achieved more effectively by providing a multi-layered wrapping paper having a toned appearance.

  The multilayer paper wrapping paper according to the present invention comprises a base paper composed of at least two paper layers, a surface layer and a back layer, and a water-dispersed resin containing resin particles is applied to at least the surface of the surface layer. Shopping with a coating layer, a suede-like appearance and hand feeling, excellent cosmetics, high slip resistance and resistance to ruled lines, giving a particularly high-class impression It is suitable for bag making such as a bag or box making such as a cardboard case, and can be manufactured at low cost.

  Hereinafter, the multilayer paper-wrapping paper having a suede appearance according to the present invention will be described in detail. It should be noted that the multilayer paper wrapping paper having a suede-like appearance according to the present invention is not limited to the following embodiments, and can be changed as appropriate without departing from the scope of the claims. Absent.

  The multilayer paper wrapping paper having a suede appearance according to the present invention (hereinafter referred to as “the multilayer paper wrapping paper”) has a base paper composed of at least two paper layers, a surface layer and a back layer. ing. In addition, the multilayer paper wrapping paper can impart a suede feel by applying a water-dispersed resin containing resin particles to at least the surface of the surface layer to form a coating layer. .

  Raw material pulp used for the base paper of this multilayer paper wrapping paper is hardwood bleached kraft pulp (LBKP), softwood bleached kraft pulp (NBKP), hardwood unbleached kraft pulp (LUKP), softwood unbleached kraft pulp (NUKP) Pulp and chips chemically treated with wood fibers such as coniferous broad-leaved sulfite pulp and coniferous sulfite pulp, or non-wood fibers such as kenaf, hemp, and straw that are fiber materials other than wood. Ground pulp obtained by mechanical pulping of chemically treated pulp or chips, Chemi-ground pulp mechanically pulped with chemicals added to wood or chips, and refiner after cooking chips until soft Virgin pulp such as semi-chemical pulp and kraft pulp, semi-chemical pulp, etc. Office waste paper containing unbleached pulp is deinked, bleached pulp, milk pack waste paper, high quality cut waste paper, coat cut waste paper, upper white, white, medium white, etc. Examples include envelopes, imitations, and recovered pulp obtained from magazine waste paper. In addition, there is an advantage that an environmental load is reduced when much waste paper pulp is used.

  Moreover, this multilayer paper-wrapping paper may mix | blend a coloring agent with the raw material pulp of a surface layer to make a colored layer, and may color the surface of a multilayer paper-wrapping paper. In addition, this multilayer paper wrapping paper is good also as a colored layer by mix | blending a coloring agent in the raw material pulp of a middle layer or a back layer, and / or a back layer.

  As the colorant, 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, a pH is adjusted by adding a sulfuric acid band, and then a basic dye and necessary for it. 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.

  The raw material pulp used for the surface layer is preferably adjusted to a freeness of 250 to 400 ml, particularly 250 to 350 ml. If the freeness of the surface layer is less than 250 ml, the fibers are likely to become dense, causing poor dewatering of the multi-layer paper, and the fiber length is shortened. It becomes easy. On the other hand, if the amount exceeds 400 ml, the fibers tend to be sparse, resulting in poor texture of the multi-layer wrapping paper, and the fiber length is long and the opacity of the raw pulp is lowered, so that the color tone of the surface layer may fluctuate. There is. That is, the cosmetic properties are deteriorated due to the deterioration of the suede feeling of the multilayer paper-wrapping wrapping paper.

  Moreover, it is preferable that the raw material pulp used for a back layer adjusts freeness to 250-450 ml, especially 250-400 ml. If the freeness of the back layer is less than 250 ml, the fibers are likely to become dense, and moisture in the paper is difficult to escape to the back surface during drying after the resin is applied. Conversely, if the freeness of the back layer exceeds 450 ml, the difference between the freeness of the raw material pulp on the surface of the multi-layered wrapping paper and the freeness of the raw material pulp of the back layer will increase, and curling will occur after drying. .

  Moreover, when this multilayer paper-wrapping wrapping paper is three or more layers, it is preferable that the raw material pulp used for the middle layer is adjusted to a freeness of 250 to 450 ml, particularly 250 to 400 ml. If the freeness of the middle layer is less than 250 ml, the fibers are likely to become dense, resulting in poor dewatering of the multi-layered wrapping paper, resulting in poor drying, and the fiber length is shortened, so that the tear strength tends to decrease. Ruled line cracks and broken bags are likely to occur during bag processing. On the other hand, if the freeness of the middle layer exceeds 450 ml, the fibers are likely to become sparse, resulting in poor formation of the multi-layered wrapping paper, and the tensile strength tends to be reduced, which tends to cause tearing during bag making.

  In addition, as a method for adjusting the freeness of the raw material pulp, a known beating machine such as a single disc refiner (SDR), a double disc refiner (DDR), or a conical refiner can be used.

  In addition, in this specification, freeness is based on the freeness test method of a JIS-P8121 (1995) pulp after disintegrating a sample with a standard disintegrator based on the JIS-P8220 (1998) disaggregation method. This is a value measured by a Canadian standard freeness tester.

  In the base paper, fillers, yield improvers, freeness improvers, paper strength enhancers, fixing agents, fluorescent brighteners, pH adjusters, antifoaming agents, pitch control agents, slime are added as necessary. Internal additives for papermaking such as a control agent, a bulking agent, and a foaming agent can be appropriately blended.

The basis weight of the multilayer paper making wrapping paper of the base paper is not particularly limited, usually 50~220g / ^{m 2,} preferably 70~200g / ^{m 2.} When the basis weight is less than 50 g / m ² , it is difficult to ensure the strength when the multi-layered wrapping paper is processed as bag making base paper or packaging base paper. On the other hand, when the basis weight exceeds 220 g / m ² , not only is the quality excessive, but also the production cost is increased. In addition, the basic weight in this specification is the value measured based on the basic weight measuring method of JIS-P8124 (1998).

In addition, in the paper making of the multilayer paper wrapping paper, 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 adjust water absorption into the base paper of the resin. Thus, the cobb sizing degree of the paper before application of the resin measured in accordance with JIS-P8140 (1998) (hereinafter referred to as “pre-coating base paper”) is 15 to 80 g / min with a contact time of 120 seconds. m ^2, is preferably adjusted preferably so that 20 to 50 g / ^{m 2.} When the cobb sizing degree of the base paper before coating is less than 15 g / m ² , it is impossible to uniformly coat the resin described later in the subsequent resin coating process. On the other hand, if the cobb sizing degree of the base paper before coating exceeds 80 g / m ² , the amount of resin to be applied penetrates into the inside of the base paper, and the desired suede appearance and feel of the present application can be obtained. I can't.

Furthermore, in the paper making of the base paper of the present multilayer paper wrapping paper, the density of the base paper before coating is preferably 0.35 to 0.93 g / cm ³ . If the density of the base paper before coating is less than 0.35 g / cm ³ , the amount of the resin soaked into the base paper is increased, so that the desired suede feel of the present application cannot be obtained. On the other hand, if the density of the base paper before coating exceeds 0.93 g / cm ³ , the amount of the resin soaked into the base paper is reduced, and the surface strength is reduced due to the weaker adsorption force of the resin to the base paper. The coating layer is easily peeled off. In addition, as a method for adjusting the density of the base paper before coating, for example, the processing conditions such as the pressure of a pressure device such as a Yankee dryer, a super calender, a gloss calender, and a soft calender, a heating temperature, and the number of nips are appropriately adjusted. .

  In addition, the paper making method of the base paper of the present multilayer paper wrapping paper is not particularly limited, and any of an acidic paper making method, a neutral paper making method, and an alkaline paper making method may be used. Also, the paper machine is not particularly limited. For example, a long paper machine, a twin wire paper machine, a circular paper machine, a short mesh combination paper machine, a Yankee paper machine, an inclined wire paper machine, etc. Various known paper machines can be used as appropriate.

The multilayer paper wrapping paper made as described above has an aqueous dispersion resin containing resin particles on the surface of at least the surface layer of the base paper in a weight solid content of 0.9 to 12.0 g / m ^2. (Dry) A coating layer is formed by coating and drying. That is, at least on the surface of the base paper, in the coating step after the dryer of the paper machine, a resin is applied or applied to provide a coating layer, and then pressed and dried while pressing the coating layer on the dryer. Thereby, a coating layer comes to show a suede-like external appearance and a touch feeling. Thereby, a suede-like appearance and a feeling of touch can be imparted to the present multi-layered wrapping paper, and the cosmetics are excellent.

  Examples of water-dispersed resins used in the multilayer paper wrapping paper include generally known water-dispersed resins such as urethane, acrylic, polyester, latex, vinyl alcohol, alkyl, and styrene-butadiene. However, it is particularly preferable to use a urethane-based resin.

The coating amount of such a water-dispersed resin is 0.9 to 12.0 g / m ² (dry), preferably 2.0 to 8.0 g / m ² (dry) in terms of weight solids. When the coating amount is less than 0.9 g / m ² (dry), it is difficult to obtain the desired suede appearance and touch feeling of the present application, and the slip angle is set to 19 degrees or more as desired of the present application. It is difficult. In addition, it becomes difficult to obtain a sufficient film thickness for preventing ruled line cracking. On the other hand, when the coating amount exceeds 12.0 g / m ² (dry), there arises a problem that the paper is not sufficiently dried in the drying step after coating the resin.

  The resin particles contained in the water-dispersed resin are those having an average particle diameter of 4 to 20 μm, preferably 8 to 20 μm. As a result, the sliding angle measured in accordance with JIS-P8147 (1994) “Inclination method of friction coefficient test method for paper and paperboard” of the present multilayer paper wrapping paper (hereinafter simply referred to as “sliding angle”). Can be 19 degrees or more. If the average particle size is less than 4 μm, the particle size is small and the coated surface is less likely to have a rough feel, making it difficult to obtain the desired suede appearance and feel of the present invention. . On the other hand, if the average particle diameter is more than 20 μm, it becomes difficult to maintain a moist and smooth suede-like texture.

  Examples of the resin particles contained in the water-dispersed resin include silicon resin, polyethylene resin, and urethane resin. In particular, in addition to heat resistance and elasticity, suede is used as a feeling of touch when applied. In order to provide a texture and appearance, urethane resin is preferable. Further, among the water-dispersed resins, the combination with the urethane resin is good, and thus the multilayer paper-wrapping paper having the suede appearance of the present invention can be provided.

  As the above-mentioned water-dispersed resin coating method, either coating by an on-machine coating facility or coating by an off-machine coating facility may be used. In view of cost and production efficiency, it is preferable to perform coating on-machine. Examples of such a coating apparatus include a calendar, a blade coater, an air knife coater, a roll coater, a reverse roll coater, a bar coater, a curtain coater, a slot die coater, a gravure coater, a champlex coater, a brush coater, a slide bead coater, Generally known coating apparatuses such as a two-roll or metering blade type size press coater, a bill blade coater, a short dwell coater, and a gate roll coater can be used.

  Further, the sliding angle of the multilayer paper wrapping paper is preferably 19 degrees or more. When the multi-layer paper wrapping paper has a sliding angle of less than 19 degrees, when the multi-layer paper wrapping paper is processed into a shopping bag, a square bottom bag, a wrapping paper, etc., when transporting the processed product, Alternatively, there is a risk of collapse of goods when goods are put in and transported. However, if the sliding angle of the multilayer paper wrapping paper becomes too high, when processing the multilayer paper wrapping paper, it may cause sheet clogging in processing equipment such as a bag making machine or an envelope processing machine, From the viewpoint of preventing the collapse of the shopping bag, the square bottom bag, and the wrapping paper in which the multi-layered wrapping paper is processed, the slip angle is preferably in the range of 19 to 55 degrees for practical purposes. .

  Further, the multilayer paper wrapping paper formed as described above has a high / low value (Ry) (hereinafter simply referred to as “roughness”) measured in accordance with the surface roughness test of JIS-B0601 (1994). .) Is 21 μm or less, and is practically 20 μm or less. When the roughness exceeds 21 μm, when gravure printing is performed on this multi-layered wrapping paper, ink smearing occurs particularly at the halftone dots, and the reproducibility is poor and the gravure printing suitability is reduced. End up.

  This multi-layer paper wrapping paper is JAPAN TAPPI No. The surface strength (hereinafter referred to as “surface strength”) measured in accordance with the surface strength test method of No. 1 wax is 14 A or more. When the surface strength is less than 14A, for example, the bag is made using the present multi-layered wrapping paper, and when the product and the product are rubbed, the surface becomes fuzzy and the problem of impairing the suede appearance occurs. However, if the surface strength exceeds 23A, the flexibility may be impaired, the surface may feel hard, and the suede feel may be lost.

Furthermore, this multilayer paper wrapping paper has a density of 0.35 to 0.93 g / cm ³ according to the thickness and density test method of JIS-P8118 (1998). When the density is less than 0.35 g / cm ³ , the multilayer paper wrapping paper cannot secure the strength as the wrapping paper for this purpose. On the other hand, when the density exceeds 0.93 g / cm ³ , the stiffness of the paper becomes too weak, so that the rigidity is lost and the folding processability tends to deteriorate.

  Furthermore, the multi-layered wrapping paper does not cause ruled line cracks measured for strength against folding. When the ruled line breaks, the multi-layered wrapping paper will not have the necessary strength to use it as a shopping bag, square bottom bag, or wrapping paper. It will be damaged.

  The multilayer paper wrapping paper formed as described above has an excellent suede-like appearance and feel, is excellent in cosmetics, and is also excellent in slip resistance. A high-quality impression can be given to the formed shopping bag, packaging paper, and the like.

  The multilayer paper wrapping paper according to the present invention has been described for the case where the paper layer is composed of two layers. However, the middle layer is composed of one or two or more layers, and is composed of three or more paper layers. May be. Moreover, although the case where resin was coated on the surface of this multilayer paper-wrapping paper was described, it may be coated on the back surface or the front and back surfaces.

  In order to confirm the effect of this multilayer paper wrapping paper, 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 the 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.

  In order to compare 39 types of multilayer paper wrapping paper according to the present invention (referred to as “Example 1” to “Example 39”) with these Examples 1 to 39, Paperboard (this is referred to as “Comparative Example 1” or “Comparative Example 2”) was prepared in the configuration shown in Table 1.

〔実施例１〕
（基紙の作成）
＜表層＞
広葉樹晒クラフトパルプ（ＬＢＫＰ）を１００質量％用い、ダブルディスクリファイナーでフリーネス（ＣＳＦ）が３００ｍｌとなるように原料パルプを調整し、表層用の原料パルプスラリーを作製した。この表層用の原料パルプスラリーに、着色剤、定着剤、サイズ剤、紙力増強剤を添加した。なお、着色剤としてアニオン性直接染料及び顔料を用いた。また、定着剤として硫酸バンドを用い、３．０質量％添加した。さらにサイズ剤として酸性ロジンサイズ剤を用い、０．７５質量％添加し、さらに紙力増強剤を０．４質量％添加した。
＜中層＞
コート断裁落ち古紙パルプを１００質量％用い、ダブルディスクリファイナーでフリーネス（ＣＳＦ）が３５０ｍｌとなるように原料パルプを調整し、中層用の原料パルプスラリーを作製した。この中層用の原料パルプスラリーに、定着剤、サイズ剤、紙力増強剤を添加した。定着剤として硫酸バンドを用い、０．４質量％添加した。また、サイズ剤として酸性ロジンサイズ剤を用い、０．７５質量％添加し、さらに紙力増強剤を０．４質量％添加した。
＜裏層＞
地券古紙パルプ１００質量％用い、ダブルディスクリファイナーでフリーネス（ＣＳＦ）が４００ｍｌとなるように原料パルプを調整し、裏層用の原料パルプスラリーを作製した。この裏層用の原料パルプスラリーに、定着剤及びサイズ剤を添加した。なお、定着剤として硫酸バンドを用い、０．４質量％添加した。また、サイズ剤として酸性ロジンサイズ剤を用い、０．７５質量％添加し、さらに紙力増強剤を０．４質量％添加した。

[Example 1]
(Creation of base paper)
<Surface>
Using 100% by mass of hardwood bleached kraft pulp (LBKP), the raw pulp was adjusted with a double disc refiner so that the freeness (CSF) was 300 ml, and a raw pulp slurry for the surface layer was prepared. A colorant, a fixing agent, a sizing agent, and a paper strength enhancer were added to the raw material raw material slurry. Anionic direct dyes and pigments were used as colorants. Further, a sulfuric acid band was used as a fixing agent, and 3.0% by mass was added. Further, an acidic rosin sizing agent was used as a sizing agent, and 0.75% by mass was added, and further a paper strength enhancer was added by 0.4% by mass.
<Middle layer>
The raw pulp was adjusted using a double disc refiner so that the freeness (CSF) was 350 ml using 100% by weight of the waste paper pulp that had been cut from the coat, and a raw pulp slurry for the middle layer was prepared. A fixing agent, a sizing agent, and a paper strength enhancer were added to the intermediate layer raw material pulp slurry. A sulfuric acid band was used as a fixing agent, and 0.4% by mass was added. Further, an acidic rosin sizing agent was used as a sizing agent, and 0.75% by mass was added, and further a paper strength enhancer was added by 0.4% by mass.
<Back layer>
The raw pulp was adjusted so that the freeness (CSF) was 400 ml with a double disc refiner using 100% by mass of the waste paper waste paper pulp, and the raw pulp slurry for the back layer was prepared. A fixing agent and a sizing agent were added to the raw material pulp slurry for the back layer. A sulfuric acid band was used as a fixing agent, and 0.4% by mass was added. Further, an acidic rosin sizing agent was used as a sizing agent, and 0.75% by mass was added, and further a paper strength enhancer was added by 0.4% by mass.

Using the raw material pulp slurries of each of the surface layer, the middle layer, and the back layer, the surface pulp, the 3 layers of the middle layer, and the back layer of the raw material pulp slurry were combined by a circular mesh 5-layer paper machine, and the basis weight was 170 g / and paper multilayer paper making wrapping paper (board) having a colored layer consisting of base paper a five-layer structure of m ^2.
(Resin adjustment)
(Example 1) First, as an aqueous dispersion resin containing resin particles, a die plastic coat SCW-6734 clear manufactured by Dainichi Seika Kogyo Co., Ltd. was used. This resin is applied to the surface of the surface layer of the base paper, which is a colored layer, so that the coating amount is 0.8 g / m ² (dry) as a solid content in the coating part after the pre-dryer. The multilayer paper wrapping paper of Example 1 was obtained by forming and applying a suede tone layer on the surface of the surface of the base paper.

  (Examples 2 to 9) A multilayer paper wrapping paper obtained in the same manner as in Example 1 except that the amount of resin applied to the surface of the base paper was changed as shown in Table 1.

  (Examples 10 to 15) A multilayer paper sheet obtained in the same manner as in Example 7 except that the average particle diameter of the resin particles contained in the resin applied to the surface of the base paper was changed as shown in Table 1. Wrapping paper.

  (Examples 16 to 23) A multilayer paper wrapping paper obtained in the same manner as in Example 7 except that the Cobb sizing degree of the surface layer on which the resin of the base paper is applied is changed as shown in Table 1.

  (Examples 24 to 30) A multilayer paper wrapping paper obtained in the same manner as in Example 7 except that the density of the base paper was changed as shown in Table 1.

  (Examples 31 to 35) A multilayer paper wrapping paper obtained in the same manner as in Example 7 except that the type of water-dispersed resin and / or the type of resin particles were changed as shown in Table 1.

  (Examples 36 to 37) A multilayer paper wrapping paper obtained in the same manner as in Example 7 except that the paper layer of the base paper was changed as shown in Table 1.

  (Examples 38 to 39) A multilayer paper wrapping paper obtained in the same manner as in Example 7 except that the freeness of the surface layer of the base paper was changed as shown in Table 1.

  (Comparative Example 1) A multilayer paper wrapping paper obtained in the same manner as in Example 7 except that nothing was applied to the base paper.

  Comparative Example 2 A multilayer paper wrapping paper obtained in the same manner as in Example 7 except that the resin applied to the surface of the base paper was changed to a resin containing no resin particles.

“Table Cobb sizing degree (g / m ² )” in Table 1 is based on JIS-P8140 (1998), the water absorption of the surface layer of the base paper (base paper before coating) before applying the resin. Measured value.

The “density before coating (g / cm ³ )” in Table 1 is the density of the base paper before the resin is applied, and the thickness and density test method of JIS-P8118 (1998). It is a value measured according to.

  Evaluation tests were conducted on the quality evaluation of all of these Examples and Comparative Examples, that is, the slip angle, surface strength, roughness, etc. of the multilayer paper wrapping paper (all layers). 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. Moreover, the tactile sensation and coating property of the obtained multilayer paper-wrapping paper were evaluated, and comprehensive evaluation was performed together with the evaluation test results.

  “Slip angle (degree)” in Table 2 refers to the slipperiness of the multilayer paper wrapping paper according to each sample in accordance with the inclination method of the friction coefficient test method for paper and paperboard of JIS-P8147 (1994). It is a measured value.

  “Surface strength (A)” refers to the strength of the surface of the multilayer paper wrapping paper according to each sample. It is the value which measured the coated surface after coating based on the surface strength test method by 1 wax.

“Roughness (μm)” is the surface roughness of the multilayer paper wrapping paper according to each sample measured according to the surface roughness test of JIS-B0601 (1994). It is the value. (The maximum height Ry value of the difference between the maximum peak height Rp and the maximum valley depth Rm was defined as roughness.)
“Post-coating density (g / cm ³ )” is the thickness of JIS-P8118 (1998), the density of the multilayer paper wrapping paper according to each sample after coating the resin on the surface of the base paper. It is the value measured based on the test method of thickness and density.

In addition, “tactile sensation” is an evaluation of whether the appearance and feel of the multi-layered wrapping paper that is each sample are suede-like. The evaluation criteria were as follows.
(Double-circle): It is a particularly excellent suede tone.
○: Excellent suede tone.
Δ: Suede tone.
X: Not suede-like.

In addition, “coating property” is a visual evaluation of whether coating can be performed uniformly and uniformly when a resin is applied to the surface of at least the surface layer of the base paper. The evaluation criteria are as follows: It was.
○: Uniform coating is possible without unevenness.
Δ: Slightly uneven, but practically no problem
X: There is unevenness and coating cannot be performed uniformly.

  Furthermore, “ruled line cracking” is an evaluation of the strength against bending of the base paper. As an evaluation method, as shown in FIG. 1 (a), each sample is cut into a width of 200 mm and a flow of 250 mm. Then, after putting it in a hot air dryer set at a drying temperature of 100 ° C. for 30 seconds, it is taken out, and as shown in FIG. As shown in FIG. 1C, with the sides kept overlapped, an iron pipe having a diameter of 32 mm is placed at the end of the curved portion, and this pipe is rolled only once in the direction of the arrow. As shown in 1 (d), the bent portion is bent at a stretch. The evaluation method is performed by evaluating the degree of peeling of the surface layer of the paper or the surface layer and the middle layer when the bent portion is viewed from the front.

  A: There are 1 to 2 cracks less than 3 mm.

  A: There are 1 to 2 cracks of 3 mm or more and less than 5 mm.

  Δ: There are 3 to 4 cracks less than 5 mm.

  X: There are many cracks of 5 mm or more.

Furthermore, “overall evaluation” refers to the base paper after coating the resin, the cosmetic properties, the coating properties, the slip resistance, the quality of the packaging paper such as cracked lines, the quality of the packaging paper, and the manufacturing cost (ie The equipment required for the production of the multilayer paper wrapping paper according to the present invention, time, costs such as human rights expenses) and processing suitability were comprehensively judged and evaluated as a comprehensive evaluation.
A: Excellent in suede-like appearance and feel, and excellent in quality and processability.
◯: Excellent in suede appearance and feel, and has quality and processability.
Δ: Suede-like appearance and feel, but slightly inferior in terms of quality and processability.
X: It does not have a suede-like appearance and a touch feeling, and is inferior from the viewpoints of quality and processability.

表２から分かるように、本発明に係るスエード調の外観を有する多層抄き包装紙、すなわち実施例１〜３９に係る多層抄き包装紙、特に実施例７、８、１２〜１４、１８〜２０、２７、２８、３６、３７、３９に係る多層抄き包装紙は、総合評価、すなわち樹脂を塗工した後の基紙の触感、美粧性、塗工性、防滑性、罫線割れ等の製袋原紙、包装用紙としての品質、製造コスト及び加工適性を総合的に判断した評価が優れており、特に製袋用に好適なスエード調の外観を有する多層抄き包装紙を低コストで製造できることが首肯される。

As can be seen from Table 2, the multilayer paper wrapping paper having a suede appearance according to the present invention, that is, the multilayer paper wrapping paper according to Examples 1 to 39, particularly Examples 7, 8, 12-14, 18 to The multilayer paper wrapping paper according to 20, 27, 28, 36, 37, 39 has a comprehensive evaluation, i.e., touch feeling of the base paper after applying the resin, cosmetic property, coating property, slip resistance, ruled line cracking, etc. Excellent evaluation based on comprehensive evaluation of quality, manufacturing cost and processability as bag-making base paper and packaging paper, producing multi-layered packaging paper with a suede-like appearance suitable for bag-making at low cost It is confirmed that it can be done.

It is explanatory drawing of the method of evaluating the ruled line crack of a sample.

Claims (5)

  In a multilayer paper wrapping paper in which a base paper is composed of at least two paper layers, a surface layer and a back layer, a coating layer obtained by applying an aqueous dispersion resin containing resin particles on at least the surface of the surface layer A multilayer paper wrapping paper having a suede-like appearance, characterized in that ^{2. The} multilayer paper wrapping paper having a suede-like appearance according to claim 1, wherein the resin is coated in a weight solid content of 0.9 to 12.0 g / m < ² > per side.   The multilayer paper-wrapping paper having a suede-like appearance according to claim 1 or 2, wherein the resin particles have an average particle diameter of 4 to 20 µm.   The sliding angle measured in accordance with JIS-P8147 (1994) is 19 degrees or more, and the height (Ry) measured in accordance with JIS-B0601 (1994) is 21 μm or less. A multilayer paper wrapping paper having a suede-like appearance according to any one of claims 1 to 3. 5. The suede-like appearance according to claim 1, wherein the density measured in accordance with JIS-P8118 (1998) is 0.35 to 0.93 g / cm ^3. Multilayer wrapping paper.

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