JP2000343633A - Laminate and paper cushioning material using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper cushioning material free from environmental problem related to waste as a substitute of a PS cushioning material as a sheet- like or block-shaped molded article. SOLUTION: A heat-shrinkable plastic film 12 is superposed on a paper base material having half cut lines 20 or rules applied to the surface thereof so that the stretching direction thereof crosses the half cut lines 20 or rule at a right angle to form a laminate 10 based on paper bonded so that bonded parts hold at least one half cut line or rule therebetween and the laminate 10 is heated at 50-200 deg.C to form a paper cushioning material 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper cushioning material which becomes bulky when heated, and more particularly to an environment-friendly paper cushioning material which becomes bulky when used.

[0002]

2. Description of the Related Art Conventionally, foamed polystyrene (hereinafter referred to as P
S) is used in various fields because of its excellent cushioning properties, heat insulation properties, sound absorption properties, and the like. Among them, for example, it is used in a large amount as a molded molded article of a television, a video, a food tray, or the like, or as a loose cushioning material.

[0003] However, PS lacks recyclability and ease of processing, and there is a problem in that recyclability makes it difficult to establish a recovery route. This is because the low density and light weight result in a small amount of recovery by transportation, which is inefficient, resulting in high costs.
In addition, there are places where a large amount of foamed PS products can be collected, such as a fish market, as a place where they can be recycled after collection, but at present, it cannot be said that there are many places.

[0004] Therefore, for example, when incineration is carried out as a waste treatment after use, there is a problem that high heat is generated at the time of combustion, high heat is generated together with soot, and damage to the incinerator is unavoidable.
Furthermore, in landfill disposal, PS is not decomposed in the soil, and the bulkiness is one of the causes of the shortage of landfill disposal sites.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the prior art described above, and has as its object to solve various problems such as PS used as a sheet-like or block-like molded product. It is an object of the present invention to provide a paper cushioning material which can be used as an alternative to the above, and which does not have environmental problems related to waste.

[0006]

In order to achieve the above object in the present invention, first, according to the first aspect of the present invention, a paper substrate having a half-cut cut line or a ruled line on its surface is stretched in a drawing direction. A laminate mainly made of paper obtained by laminating a heat-shrinkable plastic film so as to be orthogonal to the half-cut cut line or ruled line and sticking the half-cut cut line or ruled line therebetween. The heat-shrinkable plastic film has a weight ratio of less than 50% by weight based on the total weight of the laminate.

[0007] According to the second aspect of the present invention, the first aspect is provided.
Wherein the laminate is heated at a temperature of more than 50 ° C. and less than 200 ° C. as a paper cushioning material.

[0008] According to the third aspect of the present invention, the first aspect is provided.
An adhesive layer made of a thermoplastic resin or a rewetting adhesive is provided on the surface of the laminate described in the above, cut into a predetermined size, and a large number of sheets are filled in a predetermined mold, and the temperature exceeds 50 ° C. to 200 ° C.
A paper cushioning material characterized by being heated at a temperature of less than.

According to a fourth aspect of the present invention, the surface of the laminate according to the first aspect is mixed with 5 μm to 300 μm microcapsules which expand by several tens to hundreds of times by heating. An adhesive layer of a resin or a rewetting adhesive is provided, cut into a predetermined size, a large number of sheets are filled into a predetermined mold, and heated at a temperature exceeding 50 ° C. and less than 200 ° C. Paper cushioning material.

[0010]

Embodiments of the present invention will be described below. As shown in the schematic perspective view of FIG. 1A, for example, the laminate of the present invention has a half-cut score line (2
0), a heat-shrinkable plastic film (12) is superimposed on the paper substrate (11) so that the stretching direction is orthogonal to the half-cut score line (20). 20) A laminated body (10) mainly composed of paper as an adhesive portion (30) to be stuck so as to sandwich the laminated body (20), wherein the weight ratio of the heat-shrinkable plastic film (11) is based on the total amount of the laminated body (10). It is less than 50 wt%.

A ruled line (not shown) may be used instead of the half-cut score line (20), and a half-cut score line (20) sandwiched between two bonding portions (30).
Alternatively, the number of ruled lines may be two or three.

Further, in the present invention, as shown in the schematic side sectional view of FIG. 1B, the laminate (10) is heated at a temperature of more than 50 ° C. and less than 200 ° C. so as to be thermally shrunk. The plastic film (12) shrinks in the stretching direction of the film (the direction orthogonal to the half-cut score line (20)), so that the paper substrate (11) is inwardly oriented according to the half-cut score line (20) provided on the surface. The paper substrate (11) and the heat-shrinkable plastic film (1)
2) A gap (60) is formed between the gaps, and the gap (60) exhibits a buffering effect, so that a flat cardboard-like cushioning material (1) made of paper and small pieces thereof can be obtained.

Further, in the present invention, as shown in the schematic side sectional view of FIG. 2, the laminated body (10) provided with an adhesive layer (40) made of a thermoplastic resin or a rewetting adhesive on the surface thereof may be used. Then, as shown in FIG. 3, for example, as shown in FIG. 3, small pieces of the cut laminate (10) are filled in a mold (50) of a predetermined mold, and heated at a temperature exceeding 50 ° C. and less than 200 ° C. As a result, as shown in FIG. 4, a void (60) is formed in the same manner as described above, and the laminates are bonded to each other with an adhesive layer (not shown) to form a strong molded body (block-shaped). It can be a cushioning material (1).

Further, as shown in FIG. 2, microcapsules (not shown) of 5 μm to 300 μm whose volume expands tens to hundreds of times by heating are kneaded on the surface of the laminate (10). An adhesive layer (40) made of a thermoplastic resin or a rewet adhesive is provided and cut into a predetermined size. For example, as shown in FIG.
4) is filled in a predetermined mold (50) and heated at a temperature of more than 50 ° C. and less than 200 ° C.
As shown in the figure, a gap (60) is generated in the same manner as described above, and the laminates are bonded to each other with an adhesive layer, and the kneaded microcapsules (not shown) expand while surrounding the surrounding resin and the like, and are laminated. The bonding area between the bodies is increased, the bonding strength between the laminates (10) is improved, and the microcapsules themselves are formed into a hollow structure, and the paper is formed into a strong, more cushioning molded body (block shape). The cushioning material (1) can be used.

Hereinafter, the present invention will be described in more detail with specific examples of each material. FIG. 1A shows a laminate (1) of the present invention.
0) is a schematic perspective view showing one case, and shows a paper substrate (1).
1) A heat-shrinkable plastic film (12) is superimposed on the heat-shrinkable plastic film (12), and an adhesive portion (30) is provided at two or more distant points in the stretching direction (shrinkage direction).

The paper base (11) has a basis weight of 30 to 150.
g / m ² about the pure white roll, such as high-quality paper Paper, 80
Paperboard and Japanese paper, such as uncoated cardboard and uncoated manila, of about 300 g / m ^2, and recycled papers thereof can be used.

The basis weight is 30 g / m^TwoPaper base (1
If 1) is used, the paper is too soft and weak and should be used as a cushioning material.
Not enough strength is obtained. The basis weight is 300g
/ M ^TwoIf the paper base (11) is used, the paper is too hard.
When the cushioning material is used, the product does not exhibit the cushioning function and is damaged.
This is not preferable because the problem of

As the heat-shrinkable plastic film (12) which shrinks by heating, it is possible in principle to manufacture any thermoplastic resin film by making one of the films oriented. As generally used materials, vinyl chloride, vinylidene chloride, polystyrene, polyethylene terephthalate, polyethylene, polypropylene, cross-linked polyethylene and the like can be preferably used.

An adhesive portion (3) for partially bonding the paper substrate (11) and the heat-shrinkable plastic film (12).
Means for forming 0) is not particularly limited.

When the above-mentioned laminate (10) is heated, as shown in FIG. 1 (b), the heat-shrinkable plastic film (12) shrinks and deforms to form a void (60). Because it becomes bulky, it is a flat cushioning material by itself,
It can be used for applications such as a heat insulating material and a sound absorbing material. For example, before use, it may be stored in a warehouse or the like. Also, when transporting the laminate (10), the loading efficiency can be improved and the cost can be reduced for the same reason.

Further, the cut laminates (10) may be adhered to each other to form a molded article of the paper cushioning material (1). For example, a laminate (1) in which a uniaxially stretched polyethylene film layer is provided on one surface of a paper base material (11) and an adhesive layer (40) obtained by thinning a polyethylene emulsion on the surface thereof is provided.
When 0) is filled in a 100 cm × 100 cm × 40 cm mold and heated, each of the laminates (10) forms a gap, and the adhesive layer (40) made of polyethylene emulsion provided in the laminate (10) melts and laminates. The bodies (10) adhere to each other. After cooling, the adhesive layer (40) was taken out after it was solidified.
A 40 cm block-shaped paper cushioning material (1) can be used.

The thermoplastic resin forming the adhesive layer (40) is not particularly limited as long as it is a resin exhibiting plasticity by heating at 50 ° C. to 200 ° C., for example, a low density polyethylene resin, a medium density polyethylene resin, Polyolefin resins represented by high-density polyethylene resin, polypropylene, etc., polyester resins, polyacrylates, polyvinyl acetate, polyvinyl alcohol, polyvinyl butyral, acrylic resins, polyamide resins such as polyvinylidene chloride, nylon, and polyvinylpyrrolidone And copolymers thereof, for example, ethylene-propylene copolymer, vinyl acetate-polyethylene copolymer, polyethylene-acrylic acid copolymer, etc., ethylene-α-olefin copolymer, and graft modification of these resins with acid. object, It may be N compound, ethylene-based resin wax, such as ethylene-butadiene rubber resin can be preferably used. It also includes biodegradable resins. These resins may be used alone or as a mixture.

The laminate (1) cut as described above
In the case where a molding machine that fills the mold with 0) and heats the molding machine using pressurized steam or the like, the molding machine becomes wet at one time during the process. 40)
By using a rewetting adhesive, the laminate (1
0) are bonded together to form a block-shaped paper cushioning material (1).

Examples of the rewetting adhesive include gum arabic and dextrin in a natural system and polyvinyl alcohol in a synthetic system. This rewetting adhesive was applied to the laminate (1
The means provided on the back surface of 0) is not particularly limited, but may be provided as an adhesive layer (40) on the back surface of the laminate (10) by spraying or the like.

As a result of examining the materials constituting the laminate (10), it was found that the heat shrinkage of the heat-shrinkable plastic film (12) provided on the surface of the paper substrate (11) was higher than 50 ° C. ) Is necessary to prevent bulk deformation during storage or transportation when not using as a cushioning material, and after the bulk deformation, bonding between the laminates (10) is performed. Adhesive layer (4) provided on the surface of
0) If the difference between the thermoplastic temperature of the resin and the shrinkage temperature of the heat-shrinkable plastic film (12) is large, the resin does not adhere with moderate expansion, so the temperature difference is preferably in the range of 0 ° C to 20 ° C.

Furthermore, a block-shaped paper cushioning material (1)
In order to increase the adhesive strength of the adhesive layer (40) and increase the bulk of the laminate (10), an adhesive layer (5 μm to 300 μm, which is expanded by several tens times by heating, is kneaded with an adhesive layer ( 40), it is necessary to set the expansion temperature of the microcapsules higher than the temperature showing the thermoplasticity of the adhesive layer (40). For example, the adhesive layer (40) does not melt, When it expands, it does not expand while covering the thermoplastic resin moderately, so that the difference between the thermoplastic temperature of the resin of the adhesive layer (40) and the shrinkage temperature of the heat-shrinkable plastic film (12) is 0 ° C to 20 ° C. Is preferable. If the expansion temperature of the microcapsules is not lower than 200 ° C., the energy required at the time of block-shaped molding becomes large, and there is no merit in cost.

As the microcapsules kneaded in the adhesive layer (40) provided by coating or the like on the surface of the laminate (10), use is made of heat-expandable microcapsules in which a low-boiling solvent is sealed. can do.
That is, the polymer in the outer shell is softened by heating, the enclosed solvent is gasified, and the volume expands several tens times. Examples of the solvent to be encapsulated include organic solvents such as isobutane, pentane, petroleum ether, and hexane. Examples of the polymer and the like of the outer shell constituting the microcapsule include a thermoplastic resin composed of vinylidene chloride, acrylonitrile, acrylate, methacrylate, and the like. Wrap the above organic solvent in a thermoplastic resin,
A heat-expandable microcapsule containing a solvent can be preferably used.

The laminate (10) having the adhesive layer (40) kneaded with the microcapsules as described above is 100 cm long.
When filled in a mold of 100 cm × 40 cm and heated by pressurized steam, each of the laminates (10) is deformed by the heat-shrinkable film, and further, the adhesive layer containing microcapsules on the surface of the laminate (10) (40) melts and the laminated body (10) adheres. After cooling, the resin layer is solidified and then taken out to obtain a molded product of 100 cm × 100 cm × 40 cm. The block-shaped paper cushioning material (1) obtained in this way has not only improved adhesive strength but also improved cushioning performance, heat insulation performance, and sound absorption performance by expanding the microcapsules into a hollow state. Material (1) can be used.

In the step of forming the block-shaped molded body, first, the material is deformed by the heat-shrinkable plastic film (12) and becomes bulky. Assuming that this is primary expansion, the expansion of the microcapsules kneaded in the adhesive layer (40) thereafter is referred to as secondary expansion, and these expansions have different effects.

First, the primary expansion is a large expansion like PS beads, and this laminate (10) does not become bulky at the time of storage or transportation before use (before heating). Costs can be significantly reduced.

In the secondary expansion, the laminate (10)
Since the microcapsules in the adhesive layer (40) expand the gaps between them, the adhesive strength between the laminates (10) is greatly improved. Furthermore, since the microcapsules that have expanded several tens to several hundred times are hollow structures, they have their own cushioning, sound absorption, and heat insulation properties, and their performance is greatly improved as a block-shaped molded body. Can be achieved.

The paper cushioning material (1) using the laminate (10) of the present invention can be formed into a very excellent molded article in various applications such as not only a buffering capacity but also a heat insulating capacity and a sound absorbing capacity. .

[0033]

Next, the present invention will be described in detail with reference to examples. Example 1 First, a basis weight of 10 with ruled lines applied at 1 cm intervals
4.7g / m ² high quality paper with heat shrink initiation temperature of 100 ° C
A 30 μm-thick uniaxially stretched polyethylene film (hereinafter referred to as OPE) is laminated so that the stretching direction and the ruled line are orthogonal to each other to form a laminated sheet.
cm, and cut into small pieces of 2 cm in a direction intersecting the stretching direction. Next, high-quality paper and OPE are heat-fused in the width direction in the vicinity of both edges in the stretching direction of the cut laminated sheet piece to form a linear adhesive portion, and a laminated body provided with adhesive portions at two separate points. (1
0).

When the small piece of the laminated sheet to which the two separated points are adhered is heated to 100 ° C., the OPE undergoes thermal contraction, and the high-quality paper curls as shown in FIG.
0) was obtained.

Example 2 The same thickness 3 used in Example 1
A polyethylene emulsion was applied to one side of OPE of 0 μm and dried to form an adhesive layer made of a thermoplastic resin having a thickness of 20 μm.

The OPE on which the adhesive layer made of the thermoplastic resin is formed is placed in a 2 cm ×
It was cut into strips of 0.5 cm.

Next, the basis weight used in Example 1 was 104.7 g /
m ² high-quality paper was cut into a square of 3 cm × 3 cm.
As shown in the figure, a paper substrate (1
A ruled line (22) is provided on the diagonal line of 1), and a heat-shrinkable plastic film (12) made of a strip-shaped OPE prepared earlier.
The two sheets are arranged so that they cross each other on the diagonal line of the square high-quality paper and the adhesive layer (not shown) is on the upper side, and the high-quality paper and the OPE are bonded in dots at four corners on the diagonal of the square, A laminate (10) piece having four separated adhesive portions (30) was obtained.

A large number of pieces of the laminated body (10) having the four bonded portions (30) were put into a mold of 20 cm × 10 cm × 5 cm and heated to 120 ° C. As a result, as shown in FIG. 4, the 0PE undergoes thermal shrinkage, and the central portion of the high-quality paper bulges to become a block-shaped paper cushioning material (1), and an adhesive layer made of a thermoplastic resin. (Not shown) were adhered to each other, and each laminated body (10) was firmly adhered to obtain a block-shaped paper cushioning material (1) of 20 cm × 10 cm × 5 cm.

Example 3 100 parts of the polyethylene emulsion used in Example 2 were mixed with 10 parts of microsphere F85D (manufactured by Matsumoto Yushi Pharmaceutical Co., Ltd., expansion start temperature 140 ° C.) having a diameter of 30 μm and an expansion rate of 70 times. The resulting emulsion was mixed with microcapsules and applied to one side of the 30 μm-thick OPE used in Example 1 and dried to form a 20 μm-thick microcapsule-containing adhesive layer.

The OPE on which the microcapsule-containing adhesive layer was formed was placed in a 2 cm ×
It was cut into strips of 0.5 cm. Next, the high-quality paper used in Example 1 having a basis weight of 104.7 g / m ² was cut into a square of 3 cm × 3 cm to obtain a paper base piece. As shown in FIG. 6, a ruled line (22) is diagonally formed on a piece of the paper base material (11), and two heat-shrinkable plastic films (12) made of a strip-shaped OPE prepared in advance are squared. Adhesive layers (not shown) made of thermoplastic resin are arranged so as to be parallel to the edges of the high-quality paper, and to the four edges on the diagonal of the square near the edges of each OPE. Fine paper and OP
A piece of the laminate (10) was obtained in which four points separated from each other were bonded to each other in the form of a bond (30).

A large number of pieces of the laminate (10) obtained above were
100cm x 100cm x 100cm
By heating to 40 ° C., a block-shaped paper cushioning material (1) as shown in FIG. 4 was obtained.

That is, the above-mentioned 0PE undergoes thermal contraction, and the central portion of the high-quality paper rises to form a hollow paper-shaped cushioning material, and the microcapsules expand while covering the surrounding thermoplastic resin, thereby expanding the thermoplastic resin. Are bonded to each other to increase the bonding area between the pieces of the laminated body (10), and that each laminated piece is firmly adhered to 100 cm × 100 cm.
A block-shaped paper cushioning material (1) of 100 cm was used.

<Comparative Example 1> Basis weight 10 used in Example 1
The high-quality paper of 4.7 g / m ² was cut into a piece of paper of 2 cm × 10 cm to obtain a paper cushioning material.

Comparative Example 2 A large number of small pieces of the laminate (10) obtained in Example 1 were used in Example 3 and 100 cm × 1
It was put into a 00 cm × 100 cm mold and heated to 140 ° C. to obtain a molded body.

The densities and buffering effects of the five types of paper cushioning materials or buffer molded bodies obtained in Examples 1 to 3 and Comparative Examples 1 and 2 were tested and evaluated by the following methods. The results are shown in Table 1. [Density] In Example 1 and Comparative Example 1, the materials were put into a 100 ml volumetric flask and calculated from the weight.
In Comparative Example 2, the density of the molded body was calculated by measuring the volume and weight. [Buffer Effect] 20 cm × 20 c in Example 1 and Comparative Example 1
A portable acoustic device was stored in a paper box occupied by an mx 15 cm paper box, dropped horizontally on a concrete floor from a height of 50 cm, and the damage of the stored items was visually observed. Further, in Example 2, the inside of a molded body of 20 cm × 10 cm × 5 cm was cut out, and the mobile phone was stored in the space, and 50 cm
The container was dropped horizontally on a concrete floor from a height of m, and the state of damage to the stored items was visually observed. In Example 3 and Comparative Example 2, the inside of a molded article of 100 cm × 100 cm × 100 cm was hollowed out, and a notebook computer was stored in that space.
It was dropped horizontally on a concrete floor from a height of 0 cm, and the state of damage of the stored items was visually observed. ○, △,
Indicated by ×, ○: Sufficient buffering effect. Δ: No breakage of the stored items was observed, but peeling was observed between the cushioning materials of the molded body. ×: The stored items were damaged and there was no buffer effect. And

[0046]

[Table 1]

As shown in Table 1, the capacity as a small piece cushioning material was not bulky when transporting the buffer material in both Example 1 and Comparative Example 1, and the storage cost and transport cost were almost the same. When the device was stored, the buffer capacity of Comparative Example 1 was insufficient. In Example 1, since the number of cushioning materials necessary to prevent breakage was small, the total weight was light and sufficient cushioning capacity was exhibited.

Further, the buffering capacity of the block-shaped molded body was not found in the drop test in Example 2, and the notebook computer was not found in the drop test in Example 3. Also showed sufficient buffering capacity. However, in Comparative Example 2, although no breakage of the notebook computer was observed, peeling was observed between the respective cushioning materials of the molded article, and it could not be said that sufficient cushioning ability was exhibited.

[0049]

As described above, the present invention has the following effects. That is, a heat-shrinkable plastic film is superimposed on a paper substrate having a half-cut cut line or ruled line on the surface so that the stretching direction is orthogonal to the half-cut cut line or ruled line.
A paper cushioning material which is heated at a temperature of more than 50 ° C. and less than 200 ° C. at the time of use by using a laminate mainly composed of paper stuck so as to sandwich the half-cut cut line or ruled line of the book Accordingly, it is possible to provide an environmentally friendly paper cushioning material that contributes to cost reduction during storage and transportation, is excellent in use and recycling of used paper, and is easy to be incinerated.

Further, an adhesive layer made of a thermoplastic resin or a rewetting adhesive is provided on the surface of the above-mentioned laminate, cut into a predetermined size, and a large number of molds of a predetermined type are filled. Since it is a block-shaped paper cushioning material heated at a temperature of less than ° C., it is possible to obtain a molded body suitable for use as a heat insulating material and a sound absorbing material in addition to the cushioning material.

Further, an adhesive layer of a thermoplastic resin or a rewet adhesive mixed with microcapsules whose volume expands tens to hundreds of times by heating is provided on the surface of the laminate, It is cut into a size, filled in a mold of a predetermined mold, and heated at a temperature exceeding 50 ° C. and less than 200 ° C. to form a block-shaped paper cushioning material. A molded article having excellent sound absorbing properties can be obtained.

Accordingly, the present invention exerts excellent practical effects in applications such as environmentally friendly cushioning materials, heat insulating materials or sound absorbing materials, which can replace conventional PS.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view showing an example of a laminate and a paper relaxation material of the present invention. FIG. 1 (a) is a schematic perspective view of the laminate before heating, and FIG. 2 is a schematic side cross-sectional view of a paper cushioning material showing a state after heating.

FIG. 2 is an explanatory diagram schematically showing a side cross section of an embodiment in which an adhesive layer is provided on the surface of a laminate of the present invention.

FIG. 3 is an explanatory view schematically showing an embodiment in which a small piece of a laminate of the present invention is filled in a mold, in a schematic side section.

FIG. 4 is a schematic perspective view illustrating an embodiment in which a small piece of the laminate of the present invention is used as a block-shaped paper cushioning material.

FIG. 5 is a schematic perspective view illustrating another embodiment of the laminate of the present invention.

FIG. 6 is a schematic perspective view illustrating still another embodiment of the laminate of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 {Paper cushioning material 10} Laminated body 11 {Paper base material 12} Heat shrinkable plastic film 20} Half cut cut line 22} Ruled line 30} Adhesive part 40} Adhesive layer 50} Gold Mold 60 ° gap

Continued on the front page F-term (reference) 3E075 BA92 DB12 DB22 DE21 GA02 GA05 4F100 AK01B AK01C AK03 AK04 AK21G AK42 AK68 AK69 AN00G BA02 BA05 BA07 BA10A BA10C BA11 BA22 BA32 CA02C DC13A DD01 DD11 DD21 DE04C90BDG01 DJ01 DJ01 DJ01 DG01E JJ03 JK10 JL11C JM01

Claims (4)

[Claims] 1. A heat-shrinkable plastic film is superimposed on a paper base material having a half-cut cut line or ruled line on its surface so that the stretching direction is orthogonal to the half-cut cut line or ruled line. A laminate mainly composed of paper stuck so as to sandwich a half-cut cut line or a ruled line, wherein a weight ratio of the heat-shrinkable plastic film is less than 50 wt% with respect to a total amount of the laminate. Laminate. 2. A paper cushioning material obtained by heating the laminate according to claim 1 at a temperature higher than 50 ° C. and lower than 200 ° C. 3. A laminate according to claim 1, wherein an adhesive layer made of a thermoplastic resin or a rewetting adhesive is provided on the surface of the laminate, cut into a predetermined size, and a large number of pieces are cut into a predetermined mold. A paper cushioning material which is filled and heated at a temperature higher than 50 ° C and lower than 200 ° C. 4. The surface of the laminate according to claim 1, which has a volume of 5 μm to 300 μ which expands by several tens to several hundreds by heating.
m is provided with an adhesive layer of a thermoplastic resin or a rewet adhesive mixed with microcapsules, cut into a predetermined size, a large number of sheets are filled in a predetermined mold, and the temperature exceeds 50 ° C.
A paper cushioning material characterized by being heated at a temperature of less than 200 ° C.