Cushioning paper and paper cushioning material

Abstract

To provide cushioning paper capable of obtaining a paper cushioning material excellent in cushioning property, excellent in flexure processability, and with perforation process applied, having sufficient supply property, in addition, to provide a laminated product and paper cushioning material obtained from the cushioning paper.SOLUTION: This is a cushioning paper that contains recycled pulp as a raw material pulp, with a content of recycled pulp in the raw material pulp of 80 mass% or more, a basis weight of 50 g / m2 or more and 150 g / m2 or less, and with the longitudinal and lateral tensile strength geometric mean values measured in accordance with JIS P 8113:2006 being 17.0 Nm / g or more and 70.0 Nm / g or less, and where the surface electrical resistance of one side of the cushioning material paper and that of the other side are both 8.00×1012 Ω or less.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to cushioning paper and paper cushioning materials.

Background Art

[0002] When storing contents such as products in a case such as a cardboard box for packaging, a cushioning material is used to fill the gap between the case and the contents and to absorb vibrations, impacts, etc. applied to the contents during transportation. As cushioning materials, air caps, air cushions, foam chips, etc. have been used. Air caps and air cushions are formed of a resin such as polyethylene, and a large number of hollow protrusions are formed on the resin sheet. Foam chips are relatively small-sized cushioning materials formed of a foamable resin, and are used by being packed so as to fill the gap between the case and the contents. From the viewpoint of environmental protection, paper cushioning materials (paper cushioning materials) are becoming more popular in place of the plastic cushioning materials as described above.

[0003] Patent Document 1 aims to provide a paper cushioning material having the advantages of conventional cushioning materials, that is, being able to be manufactured at low cost, being easily disposable because no harmful gas is generated during incineration, and having versatility because it is amorphous, and further having an excellent cushioning effect. A method for manufacturing a paper cushioning material is disclosed, which comprises supplying a piece of paper into the hollow drum from the slit of the hollow drum having a slit formed in the axial direction, hooking the tip of the piece of paper on the inner surface of the hollow drum, and further continuing the supply of the piece of paper to fold the piece of paper in a zigzag manner inside the hollow drum, and then moving a compression plate movable along the axial direction inside the hollow drum to compress and round the zigzag-folded piece of paper inside the hollow drum from the end side of the hollow drum.

Prior Art Documents

Patent Documents

[0004] Patent Document 1 Japanese Patent No. 4331297 Summary of the Invention Problems to be Solved by the Invention

[0005] The method for manufacturing a paper cushioning material described in Patent Document 1 has been studied for the method of manufacturing a paper cushioning material bent from paper pieces, but the cushioning paper itself used for the paper cushioning material has not been studied. An object of the present invention is to provide a cushioning paper for a cushioning material that has excellent cushioning properties, excellent bendability, and sufficient supplyability in a form with perforation processing. Further, an object of the present invention is to provide a laminate and a paper cushioning material obtained from the cushioning paper for a cushioning material. Note that "supplyability" means that it is possible to suppress the overlapping of the cushioning papers for a cushioning material and their supply to a paper cushioning material manufacturing machine. Further, "bendability" means the workability when forming a fold by bending the cushioning paper for a cushioning material to obtain a paper cushioning material. Means for Solving the Problems

[0006] The inventors of the present invention have found that by setting the basis weight of a cushioning paper containing a specific amount of waste paper pulp as a raw material pulp within a specific range, the geometric mean value of the specific tensile strength in the longitudinal direction and the specific tensile strength in the transverse direction, and the surface electrical resistance of both surfaces of the cushioning paper to a specific value or less, the above problems are solved. That is, the present invention relates to the following <1> to <8>. <1> A cushioning paper for a cushioning material containing waste paper pulp as a raw material pulp, wherein the content of waste paper pulp in the raw material pulp is 80% by mass or more, the basis weight is 50 g / m 2 or more and 150 g / m 2 or less, The geometric mean value of the longitudinal specific tensile strength and the transverse specific tensile strength, measured in accordance with JIS P 8113:2006, is 17.0 Nm / g or more and 70.0 Nm / g or less, and the surface electrical resistance of one surface and the surface electrical resistance of the other surface of the cushioning paper are both 8.00×10 12 Ω or less, the cushioning paper. <2> The cushioning paper according to <1>, having surface layers containing at least one selected from the group consisting of water-soluble resins and water-suspensible resins on both sides. <3> The cushioning paper according to <1> or <2>, wherein the Oken smoothness of one surface and the Oken smoothness of the other surface of the cushioning paper are both 35 seconds or less. <4> The cushioning paper according to any one of <1> to <3>, wherein the longitudinal / transverse orientation ratio of the pulp fibers constituting the cushioning paper is 1.35 or more and 1.95 or less. <5> The cushioning paper according to any one of <1> to <4>, having a thickness of 50 μm or more and 250 μm or less. <6> The cushioning paper according to any one of <1> to <5>, having a plurality of perforated portions in the transverse direction, and the longitudinal distance between adjacent perforated portions being the same. <7> A laminate formed by alternately folding back the cushioning paper according to <6> with a plurality of perforated portions provided in the transverse direction to form a bellows-like stack. <8> A paper cushioning material formed by bending the cushioning paper according to any one of <1> to <6> or the cushioning paper constituting the laminate according to <7>.

Advantages of the Invention

[0007] According to the present invention, a paper cushioning material excellent in cushioning properties can be obtained, and a cushioning paper excellent in foldability and having sufficient supplyability in a form with perforation processing is provided. Further, according to the present invention, a laminate and a paper cushioning material obtained from the cushioning paper are provided.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Mode for Carrying Out the Invention

[0009] [Paper for buffer material] The paper for a buffer material of this embodiment contains waste paper pulp as a raw material pulp, the content of waste paper pulp in the raw material pulp is 80 mass% or more, the basis weight is 50 g / m 2 or more and 150 g / m 2 or less, the geometric mean value of the specific tensile strength in the longitudinal direction and the specific tensile strength in the transverse direction, measured in accordance with JIS P 8113:2006, is 17.0 Nm / g or more and 70.0 Nm / g or less, and the surface electrical resistance of one surface and the surface electrical resistance of the other surface of the paper for a buffer material are both 8.00×10 12 Ω or less. According to this embodiment, a paper buffer material excellent in cushioning property can be obtained, and a buffer material paper excellent in bendability and having sufficient supplyability in a form subjected to perforation processing is provided. In addition, since the buffer material paper has sufficient supplyability, it can be continuously supplied to a buffer material manufacturing machine using a laminate so that the papers do not overlap, and the load on the buffer material manufacturing machine can be reduced. The reason for obtaining the above effects is that the buffer material paper contains waste paper pulp as a raw material pulp, the content of waste paper pulp in the raw material pulp is 80 mass% or more, the basis weight is 50 g / m 2 or more and 150 g / m 2The following is the case where the geometric mean value of the specific tensile strength in the longitudinal direction and the specific tensile strength in the transverse direction is 17.0 Nm / g or more and 70.0 Nm / g or less, and it is considered that a cushioning material paper excellent in cushioning properties and bending processability is obtained. Further, since the surface electrical resistance of one surface and the surface electrical resistance of the other surface of the cushioning material paper are both 8.00×10 12 Ω or less, it is considered that when the cushioning material paper is supplied to a paper cushioning material manufacturing machine in a form with perforation processing, the cushioning material paper can be prevented from being supplied in an overlapping manner. Further, in the cushioning material paper of the present embodiment, since the geometric mean value of the specific tensile strength in the longitudinal direction and the specific tensile strength in the transverse direction of the cushioning material paper is 17.0 Nm / g or more and 70.0 Nm / g or less, the lamination property is good in a form with perforation processing. "Lamination property" means that when forming a laminate, the horizontal displacement of the positions of the cushioning material papers can be suppressed. When the lamination property is good, when storing or transporting the laminate obtained by zigzag folding the cushioning material paper, it can be boxed without gaps. Note that the reason for obtaining the above effects is not limited to this. Further, according to the cushioning material paper of the present embodiment, compared with the cushioning material formed from conventional plastic, it is formed of paper mainly composed of pulp, and the environmental load is reduced. Hereinafter, the present invention will be described in more detail.

[0010] In this specification, the numerical range represented by "X to Y" means a numerical range including X as the lower limit value and Y as the upper limit value. When the numerical range is described stepwise, the upper limit and the lower limit of each numerical range can be arbitrarily combined. Further, the longitudinal direction of the cushioning material paper means the papermaking direction (MD), and the transverse direction means the direction (CD) orthogonal to the papermaking direction. Note that, for convenience, one surface and the other surface of the paper cushioning material may be referred to as "front" and "back".

[0011] The cushioning material paper of the present embodiment includes a paper base material, and the paper base material includes pulp as a raw material. The manufacturing method and type of pulp are not particularly limited. Note that the cushioning material paper of the present embodiment may include at least a paper base material, and may have a coating layer such as a resin layer or a laminate layer, etc., but it is preferably composed only of the paper base material. Note that the surface layer containing at least one selected from the group consisting of the water-soluble resin and the water-suspensible resin described later is a surface treatment of the paper base material. Further, the paper base material may have a single-layer structure or a multi-layer structure. In the case of multi-layer paper, the number of paper layers is not particularly limited, but for example, it is preferably 2 or more and 7 or less layers, more preferably 2 or more and 6 or less layers.

[0012] <Raw pulp> In the present embodiment, from the viewpoint of reducing environmental load, natural pulp fibers are preferable as the pulp constituting the paper base material. As the natural pulp fibers, wood fibers (chemical pulp, mechanical pulp), non-wood fibers, waste paper pulp, etc. are arbitrarily used as required. Among the wood fibers, examples of the chemical pulp include kraft pulp using caustic soda and sodium sulfide during wood chip digestion, and sulfite pulp using sulfurous acid and bisulfite. These pulps may be unbleached or bleached (bleached products). Further, as the mechanical pulp, groundwood pulp (GP) obtained by grinding logs with a grinder, refiner groundwood pulp (RGP) obtained by grinding waste materials from a sawmill with a refiner, thermomechanical pulp (TMP) obtained by heating and refining wood chips, etc. are mentioned. Among these, waste paper pulp, unbleached softwood kraft pulp (NUKP), and unbleached hardwood kraft pulp (LUKP) are preferably used. Further, among these wood fiber pulps, examples of the softwood serving as the raw material for the softwood pulp include pine, larch, cedar, fir, cypress, etc. Examples of the hardwood serving as the raw material for the hardwood pulp include eucalyptus, acacia, oak, beech, maple, elm, chestnut, etc.

[0013] In addition, examples of non-wood fibers that can be used in the present embodiment include bast fibers such as kozo, mitsumata, ganpi, hemp, tilia, kenaf, choma, jute, and sunn hemp; seed hair fibers such as cotton and cotton linter; leaf fibers such as Manila hemp, sisal hemp, and esparto; and stem fibers such as bamboo, rice straw, wheat straw, and sugarcane bagasse. In particular, kozo, mitsumata, kenaf, Manila hemp, sisal hemp, cotton, and cotton linter are preferably used because they have a long fiber length and can improve the strength of the cushioning paper of the present embodiment. The cooking of non-wood fibers can be performed in the same manner as that of wood fibers. Examples of waste paper pulp that can be used in the present embodiment include cardboard waste paper and magazine waste paper.

[0014] These pulp fibers can be used alone or in combination of two or more. Further, synthetic resin fibers can be mixed as necessary within a range that does not impair the effects of the present invention. Examples of synthetic resin fibers that can be used include polyethylene fibers, polypropylene fibers, polyamide fibers, polyethylene terephthalate fibers, polybutylene terephthalate fibers, and polylactic acid fibers.

[0015] In the present embodiment, from the viewpoints of obtaining a desired specific tensile strength described later and manufacturing the cushioning paper at low cost, the raw material pulp contains at least waste paper pulp, and may contain softwood pulp and / or hardwood pulp in addition to the waste paper pulp. From the viewpoints of obtaining a desired specific tensile strength described later and manufacturing the cushioning paper at low cost, the content of waste paper pulp in the raw material pulp is preferably 80% by mass or more and 100% by mass or less, more preferably 85% by mass or more, still more preferably 90% by mass or more, and even more preferably 95% by mass or more.

[0016] <Optional component> The paper base material may contain, if necessary, internal additives such as, for example, anionic, cationic, nonionic or amphoteric retention aids, drainage improvers, dry paper strength enhancers, wet paper strength enhancers, fillers, fixing agents (sulfate bands), sizing agents, etc., as well as optional components such as dyes and fluorescent brightening agents. It is preferably contains a dry paper strength enhancer. Examples of the dry paper strength enhancer include cationized starch, polyacrylamide, carboxymethyl cellulose, etc. Among these, from the viewpoint of obtaining the desired specific tensile strength and tensile strength described later, a polyacrylamide-based dry paper strength enhancer is preferable. When the cushioning material paper of the present embodiment contains a dry paper strength enhancer, the content of the dry paper strength enhancer is preferably 0.1 part by mass or more and 3 parts by mass or less, more preferably 0.3 part by mass or more, still more preferably 0.5 part by mass or more, and more preferably 2.0 parts by mass or less, still more preferably 1.2 parts by mass or less, even more preferably 1.0 part by mass or less, based on 100 parts by mass of the raw material pulp.

[0017] Examples of the wet paper strength enhancer include polyamide polyamine epichlorohydrin, urea formaldehyde resin, melamine formaldehyde resin, etc. Examples of the filler include inorganic fillers such as talc, kaolin, calcined kaolin, calcium carbonate, calcium sulfate, barium sulfate, titanium dioxide, zinc oxide, alumina, magnesium carbonate, magnesium oxide, silica, white carbon, bentonite, zeolite, sericite, smectite, etc., and organic fillers such as acrylic resins and vinylidene chloride resins. When the cushioning material paper of the present embodiment contains a wet paper strength enhancer, the content of the wet paper strength enhancer is preferably 0.01 part by mass or more and 3 parts by mass or less, more preferably 0.05 part by mass or more, still more preferably 0.1 part by mass or more, and more preferably 1.5 parts by mass or less, still more preferably 0.5 part by mass or less, based on 100 parts by mass of the raw material pulp. Note that the cushioning material paper of the present embodiment preferably does not contain a wet paper strength enhancer.

[0018] Examples of sizing agents include internal sizing agents such as rosin sizing agents, synthetic sizing agents, and petroleum resin sizing agents, and surface sizing agents such as styrene / acrylic acid copolymers and styrene / methacrylic acid copolymers. When the cushioning paper of the present embodiment contains a sizing agent, the content of the sizing agent is preferably 0.01 part by mass or more and 3 parts by mass or less, more preferably 0.05 part by mass or more, still more preferably 0.1 part by mass or more, and more preferably 1.5 parts by mass or less, still more preferably 0.5 part by mass or less, based on 100 parts by mass of the raw material pulp. Note that the cushioning paper of the present embodiment preferably does not contain a sizing agent.

[0019] When the cushioning paper of the present embodiment contains a fixing agent, the content of the fixing agent is preferably 0.01 part by mass or more and 5 parts by mass or less, more preferably 0.1 part by mass or more, still more preferably 0.5 part by mass or more, and more preferably 3 parts by mass or less, still more preferably 1.5 parts by mass or less, based on 100 parts by mass of the raw material pulp.

[0020] <Surface layer> From the viewpoint of obtaining a desired surface electrical resistance described later, the cushioning paper of the present embodiment preferably has a surface layer containing at least one selected from the group consisting of a water-soluble resin and a water-suspensible resin, and preferably has a surface layer containing a water-soluble resin. Examples of the water-soluble resin include modified starches such as oxidized starch and cationized starch, polyacrylamide, polyvinyl alcohol, and the like. Examples of the water-suspensible resin include starch. When using starch, self-modification such as enzymatic modification and thermochemical modification may be performed. The surface layer may be formed by applying a liquid for a surface layer having at least one selected from the group consisting of a water-soluble resin and a water-suspensible resin to the surface of the paper base material. The application amount (solid content) of the surface layer is preferably 0.1 g / m 2 or more and 3.5 g / m 2 or less, more preferably 0.3 g / m 2 or more, still more preferably 0.5 g / m2 or less, more preferably 2.5 g / m 2 or less, still more preferably 1.5 g / m 2 or less. Note that the surface layer may be applied to only one side, but it is preferably applied to both sides. When applied to both sides, the above preferred application amount is the preferred application amount for both sides. Note that the ratio of the application amount on one side to the application amount on the other side of the paper base material (application amount on one side / application amount on the other side) is preferably 0.8 / 1.0 to 1.2 / 1.0, more preferably 0.9 / 1.0 to 1.1 / 1.0.

[0021] <Method for manufacturing paper for cushioning material> The method for manufacturing paper for cushioning material preferably includes a step of papermaking a slurry containing the above raw material pulp to obtain paper for cushioning material. The papermaking method is not particularly limited, and examples include an acid papermaking method in which papermaking is performed at a pH of around 4.5, a neutral papermaking method in which papermaking is performed at a pH of about 6 to about 9, and the like. In the papermaking process, if necessary, papermaking process chemicals such as a pH adjuster, an antifoaming agent, a pitch control agent, and a slime control agent can be appropriately added. The papermaking machine is also not particularly limited, and examples include a continuous papermaking machine such as a fourdrinier type, a cylinder type, an inclined type, or a multi-layer combined papermaking machine combining these.

[0022] In the present embodiment, in the papermaking process, the jet / wire ratio (J / W ratio), which is the ratio of the flow rate (J) of the stock ejected onto the wire to the running speed (W) of the papermaking wire, can be appropriately adjusted from the viewpoint of making the ratio of the longitudinal specific tensile strength to the transverse specific tensile strength (longitudinal specific tensile strength / transverse specific tensile strength) and the longitudinal / transverse orientation ratio of the pulp fibers constituting the paper for cushioning material within a desired range, which will be described later.

[0023] Also, after papermaking, it is preferable to include a coating step of applying a coating liquid containing at least one selected from the group consisting of a water-soluble resin and a water-suspensible resin on at least one surface. By the above coating step, a surface layer is formed. As the coating device, a size press machine or the like can be used.

[0024] It is preferable to perform perforation processing on the buffer material paper obtained through the above papermaking step and, if necessary, the above coating step to form perforation parts. The perforation processing step can be carried out by a conventional method using, for example, a commercially available perforation processing machine. Examples of commercially available perforation processing machines include a business form rotary printing machine (MVF-18B manufactured by Miyakoshi), an automatic sewing machine (VP-66A manufactured by Horizon Japan), and a paperboard ruling device (E-888 manufactured by Nippon T.M.C.).

[0025] <Properties of the buffer material paper> (Grammage) The grammage of the buffer material paper is 50 g / m 2 or more and 150 g / m 2 or less from the viewpoints of cushioning property and bendability when used as a paper buffer material. The grammage of the buffer material paper is preferably 55 g / m 2 or more, more preferably 65 g / m 2 or more, still more preferably 70 g / m 2 or more from the viewpoint of cushioning property, and preferably 135 g / m 2 or less, more preferably 110 g / m 2 or less, still more preferably 90 g / m 2 or less from the viewpoints of lamination property and bendability when used as a paper buffer material. The grammage of the buffer material paper is measured in accordance with JIS P 8124:2011. Specifically, it is measured by the method described in the examples.

[0026] (Thickness) The thickness of the paper for the cushioning material is preferably 50 μm or more and 250 μm or less from the viewpoints of cushioning performance and bendability when forming a paper cushioning material. From the viewpoint of cushioning performance, it is more preferably 75 μm or more, still more preferably 90 μm or more, even more preferably 105 μm or more, and particularly preferably 120 μm or more. From the viewpoint of bendability when forming a paper cushioning material, it is more preferably 220 μm or less, still more preferably 190 μm or less, and even more preferably 160 μm or less. The thickness of the paper for the cushioning material is measured in accordance with JIS P 8118:2014, specifically, by the method described in the examples.

[0027] (Density) The density of the paper for the cushioning material in the present embodiment is preferably 0.40 g / cm 3 or more and 0.90 g / cm 3 or less from the viewpoints of cushioning performance and bendability when forming a paper cushioning material. Generally, for the same basis weight, a paper cushioning material with lower density has better cushioning performance. The density of the paper for the cushioning material is more preferably 0.45 g / cm 3 or more, still more preferably 0.50 g / cm 3 or more, and more preferably 0.80 g / cm 3 or less, still more preferably 0.75 g / cm 3 or less, even more preferably 0.70 g / cm 3 or less, and particularly preferably 0.65 g / cm 3 or less. The density of the paper for the cushioning material can be appropriately adjusted by adjusting the pressing pressure in the papermaking process or calendar treatment. Also, the density of the paper for the cushioning material is calculated from the thickness and basis weight of the paper for the cushioning material.

[0028] (Specific tensile strength) The paper for a buffer material according to this embodiment has a geometric mean value of the specific tensile strength in the longitudinal direction and the specific tensile strength in the transverse direction, which is measured in accordance with JIS P 8113:2006, of 17.0 Nm / g or more and 70.0 Nm / g or less. When the geometric mean value is 17.0 Nm / g or more, it is preferable because it has excellent cushioning properties. When the geometric mean value is 70.0 Nm / g or less, it is preferable because it has excellent bendability when used as a paper buffer material. Further, from the viewpoint of cushioning properties, the geometric mean value is preferably 20.0 Nm / g or more, more preferably 23.0 Nm / g or more, still more preferably 26.0 Nm / g or more, and from the viewpoints of laminating properties and bendability when used as a paper buffer material, it is preferably 60.0 Nm / g or less, more preferably 48.0 Nm / g or less, still more preferably 40.0 Nm / g or less, and even more preferably 32.0 Nm / g or less. In addition, for the paper for a buffer material having a perforation part, the specific tensile strength in the longitudinal direction excluding the perforation part and the specific tensile strength in the transverse direction excluding the perforation part are within the above range. The tensile strength in the longitudinal direction and the tensile strength in the transverse direction of the paper for a buffer material are measured in accordance with JIS P 8113:2006, and the geometric mean of the value obtained by dividing the tensile strength in the longitudinal direction by the basis weight (specific tensile strength in the longitudinal direction) and the value obtained by dividing the tensile strength in the transverse direction by the basis weight (specific tensile strength in the transverse direction) is calculated. Specifically, it is measured and calculated by the method described in the examples. The specific tensile strength can be adjusted to a desired range depending on the type of raw material pulp, the blending ratio, the blending amount of a paper strengthening agent (dry paper strengthening agent), the density of the paper for a buffer material, etc. When the blending amount of the paper strengthening agent is increased, the specific tensile strength tends to increase. Also, when using waste paper pulp, NUKP, and LUKP, when the ratio of NUKP is increased, the specific tensile strength tends to increase.

[0029] The ratio of the tensile strength in the longitudinal direction to the tensile strength in the transverse direction (tensile strength in the longitudinal direction / tensile strength in the transverse direction) (hereinafter also referred to as the aspect ratio of the specific tensile strength) is preferably 1.0 or more and 5.5 or less. When the aspect ratio of the specific tensile strength is 1.0 or more, it is preferable because it has excellent bendability. Also, when the aspect ratio of the specific tensile strength is 5.5 or less, it is preferable because it has excellent cushioning properties. The aspect ratio of the tensile specific strength is more preferably 1.3 or more, further preferably 1.6 or more, and more preferably 4.0 or less, further preferably 3.3 or less. In addition, for cushioning paper having perforations, the "tensile strength in the longitudinal direction excluding the perforations / tensile strength in the lateral direction excluding the perforations" falls within the above-mentioned range. The aspect ratio of the tensile specific strength can be appropriately adjusted by adjusting the J / W ratio in the papermaking process.

[0030] (Oken type smoothness) From the viewpoint of supplyability, the cushioning paper of this embodiment has an Oken smoothness of both one side and the other side of 35 seconds or less, more preferably 25 seconds or less, even more preferably 20 seconds or less, and even more preferably 15 seconds or less, and although there is no particular lower limit, it is, for example, 1 second or more. The Oken smoothness of the cushioning paper is measured in accordance with JIS P 8155:2010, and specifically, is measured by the method described in the Examples. The Oken smoothness of cushioning paper can be controlled by the pressure in the calendaring process, the conditions of the Clupak process, etc. For example, increasing the pressure in the calendaring process tends to improve the smoothness (the Oken smoothness becomes higher). Also, increasing the difference between the production speed on the inlet side and the production speed on the outlet side of the Clupak processing device tends to decrease the Oken smoothness.

[0031] (Surface Electrical Resistance) From the viewpoint of supplyability, the cushioning paper of the present embodiment has a surface electrical resistance of 8.00×10 12 Ω or less, preferably 6.00×10 12 Ω or less, more preferably 4.00×10 12 Ω or less, more preferably 2.50×10 12 Ω or less, and the lower limit is not particularly limited, but for example, 1.00×10 11 The surface electrical resistance of the cushioning paper is measured in accordance with JIS K 6911:2006, specifically, by the method described in the examples. The surface electrical resistance of the cushioning material paper can be controlled by conditions such as the moisture content of the paper, the thickness of the paper, and the coating amount of the surface layer. For example, when the coating amount of the surface layer is increased, the surface electrical resistance tends to decrease. Also, when the moisture content of the paper is increased by reducing the dryer load during papermaking, the surface electrical resistance tends to decrease.

[0032] (Longitudinal / transverse orientation ratio of pulp fibers) In the cushioning material paper of this embodiment, the longitudinal / transverse orientation ratio of the pulp fibers is preferably 1.35 or more and 1.95 or less, more preferably 1.40 or more, still more preferably 1.45 or more, even more preferably 1.50 or more, and still more preferably 1.55 or more, and is more preferably 1.85 or less, still more preferably 1.70 or less, and even more preferably 1.65 or less. From the viewpoints of supplyability and bendability, the longitudinal / transverse orientation ratio of the pulp fibers is preferably not less than the above lower limit, and from the viewpoints of lamination and cushioning properties, it is preferably not more than the above upper limit. Note that the longitudinal / transverse orientation ratio of the fibers of the cushioning material paper is measured by the method described in the examples. The fiber orientation ratio can be appropriately adjusted by adjusting the J / W ratio in the papermaking process.

[0033] (Interval between perforations) The cushioning material paper (reference numeral 10 in FIG. 1) of this embodiment has a plurality of perforations (reference numeral 1 in FIG. 1) in the transverse direction, and it is preferable from the viewpoint of making a laminate that the longitudinal distance between adjacent perforations is the same. The plurality of perforations are preferably parallel from the viewpoint of lamination properties. "The longitudinal distance between adjacent perforations is the same" means that the difference between the maximum value and the minimum value of the distances between adjacent perforations is 10% or less of the maximum value, preferably 5% or less, more preferably 1% or less, and still more preferably 0.5% or less. For example, in the cushioning material paper shown in FIG. 1, when the maximum value of the distances between adjacent perforations is 200 mm and the minimum value is 180 mm, the longitudinal distance between adjacent perforations is the same. Further, "the plurality of perforated portions are parallel" means that the angles formed by any two perforated portions are all 5 degrees or less, preferably 3 degrees or less, and more preferably 1 degree or less. The interval between the perforated portions can be appropriately selected according to the size of the laminate, the size of the cushioning material paper that can be supplied to the cushioning material manufacturing machine, the shape of the cushioning material, etc. The interval between the perforated portions is, for example, 100 mm or more and 500 mm or less.

[0034] (Length of the tying part) From the viewpoints of lamination properties and supply properties, the length of the tying part of the perforated portion (the length of each connecting part) is preferably 0.5 mm or more and 3.0 mm or less, more preferably 0.8 mm or more, still more preferably 1.2 mm or more, and more preferably 2.4 mm or less, still more preferably 1.8 mm or less.

[0035] (Length of the cutting part) From the viewpoints of lamination properties and supply properties, the length of the cutting part of the perforated portion (the length of each cut line part (each solid line part of reference numeral 1 in FIG. 1)) is preferably 0.5 mm or more and 3.0 mm or less, more preferably 0.8 mm or more, still more preferably 1.2 mm or more, and more preferably 2.4 mm or less, still more preferably 1.8 mm or less.

[0036] (Tie-cut ratio) From the viewpoints of lamination properties and supply properties, the tie-cut ratio of the perforated portion (length of the tying part / length of the cutting part) is preferably 0.2 or more and 3.0 or less, more preferably 0.5 or more, still more preferably 0.8 or more, and more preferably 2.4 or less, still more preferably 1.8 or less, and even more preferably 1.2 or less.

[0037] [Laminate] From the practical viewpoints such as storage, transportation, and continuously supplying paper to the cushioning material manufacturing machine, it is preferable to form a laminate (FIG. 2) by alternately folding back the cushioning material paper having the perforated portions in the present embodiment with a plurality of perforated portions provided in the lateral direction to form a bellows shape. As shown in FIG. 2, the laminate 20 is formed by alternately folding the cushioning paper 10 at the perforated portions 1 and laminating it in a bellows shape. The perforated portions are preferably provided in the CD direction of the cushioning paper. Note that the number of laminated sheets (the number of perforated portions + 1) can be, for example, 30 or more and 1000 or less.

[0038] [Paper cushioning material] The paper cushioning material of the present embodiment is formed by folding the cushioning paper of the present embodiment or the cushioning paper constituting the laminate of the present embodiment. The folding process is preferably performed along the MD direction (perpendicular to the CD direction) of the cushioning paper so as to form creases. As another aspect, the cushioning paper may be subjected to uneven processing to form a paper cushioning material, or it may be further folded to form a paper cushioning material. When performing uneven processing, it is preferable to improve the elongation performance by performing a Kurapak process (a process of finely shrinking the paper in the longitudinal direction on a paper machine) or the like on the cushioning paper. The folding of the cushioning paper may be performed by hand, or may be performed manually or electrically by a cushioning material manufacturing machine, and is not particularly limited. Even when a paper cushioning material is produced by folding the cushioning paper with an electric cushioning material manufacturing machine, if a cushioning paper with poor foldability is used, there is a tendency for problems such as a high load on the machine, clogging of the cushioning paper, or tearing to occur. Examples of commercially available cushioning material manufacturing machines include the X-FILL series manufactured by Nuevopak, the X-PAD series manufactured by Nuevopak, the Padpak series manufactured by Ranpak, the FillPak series manufactured by Ranpak, the PAPERplus series manufactured by Storopack, the ProPad series manufactured by Sealed Air, the FasFill series manufactured by Sealed Air, and the like. Note that the shape of the cushioning paper may be in the form of a roll or a single sheet in addition to the above-described laminate. The paper cushioning material of this embodiment is preferably used to fill the gap between a case such as a cardboard box for packaging and the contents such as products, and thereby, it is preferably used to absorb vibrations, impacts, etc. applied to the contents generated during transportation.

Examples

[0039] The features of the present invention will be described more specifically below by giving examples and comparative examples. The materials, amounts used, ratios, treatment contents, treatment procedures, etc. shown in the following examples can be appropriately changed without departing from the spirit of the present invention. Therefore, the scope of the present invention should not be construed as being limited by the specific examples shown below.

[0040] [Evaluation and Analysis] The following evaluations and analyses were performed on the cushioning material paper and the paper cushioning material of the examples and comparative examples. In the following evaluations and analyses, the basis weight, thickness, density, specific tensile strength, Kawabata smoothness, surface electrical resistance, fiber orientation ratio, bendability, and cushioning property may be measured on the cushioning material paper before the perforation process, or may be measured on the cushioning material paper after the perforation process. There is no difference in the measurement results due to the perforation process.

[0041] [Cushioning Material Paper] [Basis Weight] The cushioning material paper (without perforated parts) was cut into a length of 140,000 mm and a width of 380 mm, and perforations were made in the CD direction at intervals of 280 mm in the MD direction to obtain a cushioning material paper (with perforated parts). The perforation process was performed in the same manner as <laminability> described later. The cushioning material paper was conditioned for 24 hours in a conditioning environment specified in JIS P 8111:1998. Based on JIS P 8124:2011, the basis weight of the conditioned cushioning material paper was measured.

[0042] [Thickness] The buffer material paper (without perforations) was cut into a length of 140,000 mm and a width of 380 mm, and perforations were made in the CD direction at intervals of 280 mm in the MD direction to obtain the buffer material paper (with perforations). The perforation process was carried out in the same manner as <laminability> described later. The buffer material paper was conditioned for 24 hours in a humidity conditioning environment specified in JIS P 8111:1998. In accordance with JIS P 8118:2014, the thickness of the conditioned buffer material paper was measured.

[0043] <Density> From the measured basis weight and thickness, the density was calculated using the formula of basis weight (g / m 2 )÷thickness (μm).

[0044] <Specific tensile strength> The buffer material paper (without perforations) was cut into a length of 140,000 mm and a width of 380 mm, and perforations were made in the CD direction at intervals of 280 mm in the MD direction to obtain the buffer material paper (with perforations). The perforation process was carried out in the same manner as <laminability> described later. The buffer material paper (with perforations) was separated by two randomly selected adjacent perforations, and the paper without perforations was used as the test paper. Five test papers were prepared. After conditioning the test paper for 24 hours in a humidity conditioning environment specified in JIS P 8111:1998, in accordance with JIS P 8113:2006, the tensile strength of the conditioned test paper was measured. The tensile strength in the MD direction and the CD direction was measured. The test was conducted using a horizontal tensile testing machine (manufactured by Lorentzen & Wattre, CODE SE - 064), and the specific tensile strength was calculated by dividing the obtained tensile strength (the average value of the tensile strengths of five test pieces) by the basis weight.

[0045] <Wang Research Smoothness> The buffer material paper (without perforations) was cut into pieces with a length of 140,000 mm and a width of 380 mm, and perforations were made in the CD direction at intervals of 280 mm in the MD direction to obtain the buffer material paper (with perforations). The perforation process was carried out in the same manner as the <laminability> described below. The buffer material paper (with perforations) was separated by two randomly selected adjacent perforations, and the paper without perforations was used as the test paper. Five test papers were prepared. The test papers were conditioned for 24 hours in the humidity conditioning environment specified in JIS P 8111:1998. In accordance with JIS P 8155:2010, the Bekk smoothness was measured for the front and back surfaces of the five conditioned test pieces, and the average value was calculated as the Bekk smoothness value.

[0046] <Surface electrical resistance> The buffer material paper (without perforations) was cut into pieces with a length of 140,000 mm and a width of 380 mm, and perforations were made in the CD direction at intervals of 280 mm in the MD direction to obtain the buffer material paper (with perforations). The perforation process was carried out in the same manner as the <laminability> described below. The buffer material paper (with perforations) was separated by two randomly selected adjacent perforations, and the paper without perforations was used as the test paper. Five test papers were prepared. The test papers were conditioned for 24 hours in the humidity conditioning environment specified in JIS P 8111:1998. In accordance with JIS K 6911:2006, the surface electrical resistance was measured for the front and back surfaces of the five conditioned test papers, and the average value was calculated as the surface electrical resistance.

[0047] <Fiber orientation ratio> In the same manner as <surface electrical resistance>, five test papers conditioned for 24 hours were obtained. For each conditioned test paper, the fiber orientation ratio was measured by using a SONIC SHEET TESTER (SST) manufactured by Nomura Shoji Co., Ltd. to measure the ultrasonic propagation velocity (Vmd) in the longitudinal direction and the ultrasonic propagation velocity (Vcd) in the transverse direction of the buffer material paper, calculating the ratio (Vmd / Vcd), and taking the average value of the ratios of the five test papers as the fiber orientation ratio.

[0048] <Laminability> The buffer material paper (without perforations) was cut into a length of 140,000 mm and a width of 380 mm, and perforations were made in the CD direction at intervals of 280 mm in the MD direction to obtain the buffer material paper (with perforations). The buffer material paper (with perforations) was folded in a bellows shape to obtain a laminate. The perforation process and the bellows folding process were carried out using a business form rotary printing machine (MVF-18B manufactured by Miyakoshi). The perforation blade used in the perforation process had a tie length of 1.5 mm and a cut length of 1.5 mm, and the line pressure was 9.5 N / mm. The state of the folded part and the deviation of the buffer material paper constituting the laminate were observed and evaluated according to the following criteria. If the evaluation is A to C, there is no practical problem. Note that the deviation indicates the maximum difference in the positions of the sides of the top and bottom papers. Regarding the "deviation", a supplementary explanation will be given taking the buffer material paper shown in Fig. 1 as an example. The buffer material paper shown in Fig. 1 is a buffer material paper with a width of 380 mm and perforations made in the CD direction at intervals of 280 mm in the MD direction. Assuming that a laminate was produced using the buffer material paper shown in Fig. 1 (the number of perforated parts is, for example, 35), the "deviation" is the larger of the distances in the MD direction between measurement points 3a and 3c and the distances in the MD direction between measurement points 3b and 3d. A: No folding is observed in the non-perforated part, and the deviation is less than 5 mm B: No folding is observed in the non-perforated part, and the deviation is 5 mm or more and less than 10 mm C: No folding is observed in the non-perforated part, and the deviation is 10 mm or more and less than 15 mm D: Folding is observed in the non-perforated part, or no folding is observed in the non-perforated part, and the deviation is 15 mm or more

[0049] <Supplyability> The buffer material paper (without perforations) was cut into a length of 140,000 mm and a width of 380 mm, and perforations were made in the CD direction at intervals of 280 mm in the MD direction to obtain the buffer material paper (with perforations). The buffer material paper (with perforations) was folded in a bellows shape to obtain a laminate. The perforation process and the bellows folding process were performed using a business form rotary printing machine (MVF-18B manufactured by Miyakoshi). The perforation blade used in the perforation process had a stitch length of 1.5 mm and a cut length of 1.5 mm, and the line pressure was 9.5 N / mm. The obtained laminate was installed in a buffer material automatic manufacturing machine (X-FILLTM A type manufactured by NUEVOPAK), and the buffer material with a length of 140,000 mm of the buffer material paper was produced by feeding it out at a speed of 100 m / min. Among the obtained buffer materials, the ratio (X (%)) of "the length of the portion where the buffer material papers constituting the laminate are connected in perforation units and enter the manufacturing machine to become the buffer material" to "the total length of the buffer material" was calculated and evaluated according to the following criteria. If the evaluation is A to C, there is no practical problem. Note that X (%) was calculated by measuring the number of locations where the buffer material papers were connected and entered the manufacturing machine to become the buffer material, and using the following formula. X (%) = 100 × A / B A: The number of locations where the buffer material papers constituting the laminate are connected and enter the manufacturing machine to become the buffer material × the distance between adjacent perforated portions (280 mm) B: The total length of the buffer material paper (140,000 mm) Note that "the number of locations where the buffer material papers constituting the laminate are connected and enter the manufacturing machine to become the buffer material" is counted as 1 when the buffer material papers constituting the laminate overlap by 2 sheets, 2 when they overlap by 3 sheets, and n - 1 when they overlap by n sheets. A: The connection ratio is less than 0.3% B: The connection ratio is 0.3% or more and less than 0.7% C: The connection ratio is 0.7% or more and less than 1.1% D: The connection ratio is 1.1% or more

[0050] <Bending processability> The bendability is the running and feeding stability in the bending process of the buffer material manufacturing machine. In the examples, for the purpose of simulating practical production, evaluation was carried out by the following method using a laboratory machine. The buffer material paper (without perforations) was cut into a length of 140,000 mm and a width of 380 mm, and perforations were made in the CD direction at intervals of 280 mm in the MD direction to obtain a buffer material paper (with perforations). The buffer material paper (with perforations) was folded in a bellows shape to obtain a laminate. The tip portion (about 5 cm) in the MD direction of this laminate was alternately folded back at intervals of 3 cm in the width direction to form a herringbone shape, and the paper buffer material manual manufacturing machine (manufactured by NUEVOPAK, X-FILL TM MM type) was passed through the bending processing section. Next, the paper buffer material manual manufacturing machine was installed below the tensilon universal material testing machine (manufactured by A&D, RTI1310) as shown in Figure 3. At this time, the discharge port of the paper buffer material manual manufacturing machine was at an angle of 45°C from the test bench of the tensilon universal material testing machine, and the height of the lower end of the upper chuck of the tensilon universal material testing machine and the center of the discharge port was aligned, and the horizontal center of the discharge port and the center of the upper chuck were aligned for installation. Finally, the herringbone-shaped buffer material protruding from the discharge port was grasped with the upper chuck and pulled up at a speed of 1000 mm / min. The load when passing through the bending processing section was measured, and the bendability was evaluated according to the following criteria based on the average value of 5 test times. If the evaluation is A to C, there is no practical problem. Note that the greater the load when passing through the processing section, the stronger the resistance during processing, which means that in practical use, paper jams are likely to occur and the running performance becomes unstable, making it difficult to increase the processing speed. A: The average value of the maximum load is less than 8.0 N B: The average value of the maximum load is 8.0 N or more and less than 17.0 N C: The average value of the maximum load is 17.0 N or more and less than 22.0 N D: The average value of the maximum load is 22.0 N or more

[0051] 〔Paper buffer material〕 <Shock resistance> The buffer paper (without perforations) was cut into a length of 140,000 mm and a width of 380 mm, and perforations were made in the CD direction at intervals of 280 mm in the MD direction to obtain the buffer paper (with perforations). The buffer paper (with perforations) was pleated to obtain a laminate. This laminate was installed in a paper buffer automatic manufacturing machine (manufactured by PACWELL, NUEVOPAK TM X-FILL TM Type A), fed out at a speed of 100 m / min, and a paper buffer with a length of 90 cm was obtained. Next, a enclosure with a length of 22.5 cm × width of 18 cm × height of 10 cm was placed on the concrete floor, and the obtained paper buffer was folded every 22.5 cm and installed in a bellows shape to cover the bottom surface inside the enclosure (Figure 4). Subsequently, beverages (manufactured by Yakult Honsha Co., Ltd., product name: New Yakult, 65 mL) contained in plastic containers were repeatedly vertically and freely dropped from a height of 40 cm onto the buffer material inside the above-mentioned enclosure with the bottom facing vertically downward, and the number of times required until deformation such as dents and scratches occurred on the containers was counted. The test was conducted 5 times each, and the cushioning performance was evaluated according to the following criteria based on the average number of times (rounded to the first decimal place) until deformation occurred. If the evaluation is A or B, there is no practical problem. A: The average number of drops is 8 or more B: The average number of drops is 4 or more and less than 8 C: The average number of drops is less than 4

[0052] [Example 1] As a pulp raw material, a pulp slurry of waste paper (corrugated waste paper: magazine waste paper = 85:15 (mass ratio)) pulp was obtained. To 100 parts by mass of pulp (in terms of solid content), 0.8 part by mass (in terms of solid content) of a polyacrylamide-based internal paper strength enhancer (PS117, manufactured by Arakawa Chemical Industries, Ltd.) and 1.2 parts by mass (in terms of solid content) of sulfuric acid band were added as internal paper strength enhancers to prepare a paper stock. Using this paper stock, the set basis weight was 80 g / m 2 and papermaking was carried out using a three-layer long wire papermaking machine to obtain buffer paper. At this time, the J / W ratio was adjusted so that the fiber orientation ratio was 1.60 ± 0.03. The set basis weight of each layer was 22 g / m for the surface layer 2 and 23 g / m for the middle layer 2, the inner layer is 35 g / m 2 Then, oxidized starch (Ace A, manufactured by Oji Corn Starch Co., Ltd.) adjusted to a 1.0% aqueous solution using a coater was applied to both sides at 0.6 g / m 2 (1.2 g / m 2 for both sides). After coating, buffer paper (without perforations) was obtained by passing it through a calendar so that the paper thickness became 135 μm ± 5 μm.

[0053] [Example 2] Oxidized starch was applied to both sides at 0.4 g / m 2 (0.8 g / m 2 for both sides). Buffer paper (without perforations) was obtained under the same conditions as in Example 1 except for the coating.

[0054] [Example 3] Oxidized starch was applied to both sides at 0.2 g / m 2 (0.4 g / m 2 for both sides). Buffer paper (without perforations) was obtained under the same conditions as in Example 1 except for the coating.

[0055] [Example 4] Buffer paper (without perforations) was obtained under the same conditions as in Example 1 except that it was passed through a calendar so that the paper thickness became 115 μm ± 5 μm.

[0056] [Example 5] Buffer paper (without perforations) was obtained under the same conditions as in Example 1 except that it was passed through a calendar so that the paper thickness became 95 μm ± 5 μm.

[0057] [Example 6] Buffer paper (without perforations) was obtained under the same conditions as in Example 1 except that it was passed through a calendar so that the paper thickness became 145 μm ± 5 μm.

[0058] [Example 7] Buffer paper (without perforations) was obtained under the same conditions as in Example 1 except that the J / W ratio was adjusted so that the fiber orientation ratio became 1.40 ± 0.03.

[0059] [Example 8] A cushioning paper (without perforations) was obtained under the same conditions as in Example 1, except that the J / W ratio was adjusted so that the fiber orientation ratio was 1.50 ± 0.03.

[0060] [Example 9] A cushioning paper (without perforations) was obtained under the same conditions as in Example 1, except that the J / W ratio was adjusted so that the fiber orientation ratio was 1.80 ± 0.03.

[0061] [Example 10] A cushioning paper (without perforations) was obtained under the same conditions as in Example 1, except that the J / W ratio was adjusted so that the fiber orientation ratio was 1.90 ± 0.03.

[0062] [Example 11] The set basis weight was 60 g / m 2 A cushioning paper (without perforations) was obtained under the same conditions as in Example 1, except that it was passed through a calendar so that the paper thickness was 100 μm ± 5 μm.

[0063] [Example 12] The set basis weight was 130 g / m 2 A cushioning paper (without perforations) was obtained under the same conditions as in Example 1, except that it was passed through a calendar so that the paper thickness was 215 μm ± 5 μm.

[0064] [Example 13] A cushioning paper (without perforations) was obtained under the same conditions as in Example 1, except that 1.5 parts by mass (in terms of solid content) of an internal paper strength enhancer was added.

[0065] [Example 14] A cushioning paper (without perforations) was obtained under the same conditions as in Example 1, except that 2.8 parts by mass (in terms of solid content) of an internal paper strength enhancer was added.

[0066] [Comparative Example 1] A cushioning paper (without perforations) was obtained under the same conditions as in Example 1, except that oxidized starch was not coated.

[0067] [Comparative Example 2] Set the basis weight to 40 g / m 2 A cushioning material paper (without perforations) was obtained under the same conditions as in Example 1, except that it was passed through a calendar so that the paper thickness became 70 μm ± 5 μm.

[0068] [Comparative Example 3] Set the basis weight to 160 g / m 2 A cushioning material paper (without perforations) was obtained under the same conditions as in Example 1, except that it was passed through a calendar so that the paper thickness became 270 μm ± 5 μm.

[0069] [Comparative Example 4] A cushioning material paper (without perforations) was obtained under the same conditions as in Example 1, except that no internal paper strength enhancer was added.

[0070] [Comparative Example 5] A cushioning material paper (without perforations) was obtained under the same conditions as in Example 1, except that 3.5 parts by mass (in terms of solid content) of an internal paper strength enhancer was added.

[0071] Using the obtained cushioning material paper (without perforations), the above-described evaluation was performed. The results are shown in the following table.

[0072]

Table 1

[0073] From the results of the examples and comparative examples, it can be seen that the cushioning material paper of the present invention can obtain a paper cushioning material excellent in cushioning properties, is excellent in bendability, and has sufficient supplyability in the form with perforation processing.

Industrial Applicability

[0074] The cushioning material paper of the present invention can obtain a paper cushioning material excellent in cushioning properties, is excellent in bendability, and has sufficient supplyability in the form with perforation processing. Among them, it is excellent in bendability and can obtain a paper cushioning material excellent in cushioning properties, especially excellent in cushioning properties, and thus is suitably used for paper cushioning materials.

Explanation of Symbols

[0075] 1 Stitching part 2a Top surface when made into a laminate 2b Bottom surface when made into a laminate 3a, 3b, 3c, 3d Measuring points for laminate property evaluation 10 Buffer paper 20 Laminate

Claims

1. A cushioning paper containing waste paper pulp as raw material pulp, wherein the content of waste paper pulp in the raw material pulp is 80% by mass or more, The basis weight is 50 g / m ２ or more and 150 g / m ２ or less, and and the geometric mean value of the specific tensile strength in the longitudinal direction and the specific tensile strength in the transverse direction, measured in accordance with JIS P 8113:2006, is 17.0 Nm / g or more and 70.0 Nm / g or less. The surface electrical resistance of one surface and the surface electrical resistance of the other surface of the cushioning paper are both 8.00×10 １２ Ω or less, the cushioning paper.

2. The cushioning paper according to Claim 1, having surface layers containing at least one selected from the group consisting of a water-soluble resin and a water-suspensible resin on both sides.

3. The cushioning paper according to Claim 1, wherein the Oken smoothness of one side of the cushioning paper and the Oken smoothness of the other side are both 35 seconds or less.

4. The cushioning paper according to Claim 1, wherein the longitudinal / transverse orientation ratio of the pulp fibers constituting the cushioning paper is 1.35 or more and 1.95 or less.

5. The cushioning paper according to Claim 1, having a thickness of 50 μm or more and 250 μm or less.

6. The cushioning paper according to Claim 1, having a plurality of perforation portions in the transverse direction, and the longitudinal distance between adjacent perforation portions being the same.

7. A laminate formed by alternately folding back the cushioning paper according to Claim 6 at a plurality of perforation portions provided in the transverse direction and laminating it in a bellows shape.

8. A paper cushioning material formed by folding the cushioning paper according to Claim 6 or the cushioning paper constituting the laminate according to Claim 7.

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