JP3187766B2 - Gas-filled cushioning material and method of manufacturing cushioning material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to protecting contents (articles) from vibrations and shocks during packing and transporting the articles.
The present invention relates to a cushioning material interposed in a gap between a container and an article, and a method of manufacturing the cushioning material.

[0002]

2. Description of the Related Art When storing and transporting articles, a buffer is interposed in a gap between the accommodated articles and stored items (packing box, etc.).
The article was protected by fixing and immobilizing the article in the packing box containing the article. In Japanese Patent Application Laid-Open No. 9-267866, the cushioning material is a bag-like material made of a sheet-like material, in which gas is confined and expanded like a paper balloon. This cushioning material absorbs external force such as vibration and impact by the pressure of gas such as air enclosed therein. As a method of manufacturing the sheet material, a polyvinyl alcohol film (hereinafter referred to as a PVA film) is laminated on paper.

[0003] The gas permeability of PVA films and films is extremely low. For example, Kuraray's PVA film HM
# 35 Trademark (Saponification degree = 95%, thickness = 35 μm,
(Water-soluble) was conditioned at 20 ° C. and 65% RH for 2 weeks, the oxygen permeation amount was 70 ml / m 2 · 24 h · atm, and the biaxially stretched nylon film (thickness 15 μm) and the same PET film (thickness 12 μm) were used. ) Is in the middle of gas permeability. Focusing on this characteristic of the PVA film, the one disclosed in Japanese Patent Application Laid-Open No. 9-267866
A film is laminated, and used as a material for a gas-filled buffer material. Japanese Patent Application Laid- Open No. 7-189182 discloses a method in which a PVA solution is applied to paper to form a buffer material.

[0004]

The method of laminating a PVA film on paper requires a laminating step requiring a complicated technique, so that the production cost is high and the cost of the final product is high. In addition, a considerable amount of production is required in order to reduce the manufacturing cost, which hinders free selection of paper materials. Further, when a load is applied, the gas-filled cushioning material 1 made of a material obtained by laminating a paper and a PVA film or a material obtained by applying a PVA solution to a paper, as shown in FIG. The constriction 3 occurs, and the fatigue in this part progresses due to the vibration during transportation. In the worst case, the points a and b around the constriction 3 where the stress is concentrated.
In this case, there is a disadvantage that a pinhole is generated and air leaks. Therefore, the present invention economically provides a cushioning material having a sufficient cushioning effect by a simple method.

[0005]

According to the present invention, there is provided a cushioning material having a main body filled with a gas and a seal formed on a peripheral edge of the main body. The main body is formed by polymerizing a paper material and a PVA film in a non-adhesive manner. And a gap between the paper and the PVA film.
As it is formed, paper material and PNA film move freely
Configured to be capable Rutotomoni, sealing portion is provided with a structure to melt the PVA film you adhesive paper material comrades.

[0006] The paper material having a basis weight of ^{14g / m 2 ~60g / m 2} ,
It has a softness and strength of the order of commercial packaging, paper material it is desirable to configure to dispose the machine direction in the longitudinal direction of the buffer material.

The method of manufacturing a cushioning material according to the present invention comprises a step of polymerizing a first paper material and a second paper material, a first PVA film and a second PVA film, and a step of polymerizing the polymerized paper material and the PVA film. Cutting to a desired length, a step of forming a seal portion by heating and pressure leaving an opening at the edge of the polymerized paper and PVA film, and a step of injecting gas from the opening, Sealing the opening.

In the polymerization step, the first paper material and the first PVA film, and the second paper material and the second PVA film are polymerized in a non-adhesive manner, and the PVA film is formed in a step of forming a seal portion. Melts to bond the PVA films to each other and the paper material. In addition, since the paper material and the PVA film are not adhered to each other except for the peripheral seal portion, the gas is injected between the PVA films in the gas injection step.
When paper is injected, paper and PVA film are separated
Paper can be stretched and restored.
Protection member.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an example of a gas-filled cushioning material according to the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG. 3 is a top view. The gas-filled cushioning material 10 includes a paper material 11
, And is made of a rectangular material which is a double-layered PVA film 13. The four peripheral edges of the double-structured material composed of the paper material 11 and the PVA film 13 are fixed by welding or other means to seal portions 150 (150a, 150b, 150).
c, 150d), and a gas is sealed inside to form the bag body 110.

The paper material 11 may be any material that is suitable as a cushioning material, for example, has the flexibility and strength of a commercially available wrapping paper. Paper material 11 used in this embodiment, at a basis weight ^{14g / m 2 ~60g / m 2} , and has a material having flexibility and strength of the above. The PVA film 13 has an intermediate saponification degree, for example, about 95%, and has a thickness of 35 μm.
Use a water-soluble film of about m.

A method for manufacturing the gas-filled cushioning material 10 will be described. ... Referring to FIGS. 4, 5, and 6, the first paper material 11A sent from the first roll 1A wound with the paper material is put on the first PVA film 13A sent from the first roll 3A wound with the PVA film. Second PVA delivered from a second roll 3B that has been stacked and wound with a PVA film
The second paper material 11B sent from the second roll 1B around which the paper material is wound is overlaid on the film 13B. First, the sealing portion 150b is formed by heating and pressurizing means (hereinafter referred to as "heat sealing") with appropriate temperature and pressure. The polymerized material is cut to the desired dimension L of the cushioning material 10. Then, seal portions 150a and 150c are formed on both side edges by heat sealing. Next, while injecting gas at a predetermined pressure from the opening 160, the opening 160 is heat-sealed to form a sealing portion 150d, which is then sealed to form the cushioning material 10. Alternatively, as shown in FIGS. 7 and 8, paper materials 11A and 11B in a superposed state continuously fed from paper material rolls 1A and 1B and PVA film rolls 3A and 3B.
Then, seal portions 150b, 150a, and 150c are formed on the PVA films 13A and 13B. Finally, gas is injected from the openings and the seal portions 150d are formed to form the four-sided cushioning material 10 '. In this case, the sealing portion 15
The perforation 155 may be formed at the same time as the formation of 0d, so that the required number of continuous cushioning materials can be cut off.

In the seal portion 150, the PVA films 13 are melt-bonded to each other by heat sealing. And
The paper material 11 and the PVA film 13 adhere to each other by the fact that the PVA film 13 melted by heat sealing penetrates into the tissue of the paper material 11 and wraps and solidifies the paper fibers (hooking effect). The method of injecting gas into the cushioning materials 10 and 10 'may be a method of heat-sealing the opening side while injecting gas from the opening (unsealed side), or a method of sealing all sides and sharpening an injection needle or the like from one corner. There is a method of inserting a thin tube having a tip, injecting gas, and then sealing and sealing the needle insertion hole.

The gas-filled cushioning materials 10 and 10 'thus constructed are made of PVA having extremely low gas permeability.
The film 13 can maintain the shape of the air bag for a long period of time without releasing the sealed gas. Furthermore, the PVA film 13 having an intermediate saponification degree is water-soluble and biodegradable, and is easily disposed of. Furthermore, the PVA film 13 has a large elongation property. For example, a load of 1.8 kgf
/ The elongation rate increases from about 15 mm, and 2.0 kgf /
It shows about 40% elongation at 15 mm. On the other hand, the restorability is also 1.
At about 8 kgf / 15 mm, it is restored immediately. In addition, it has an elongation of more than 40% at 2.0 kgf / 15 mm, but also has a restoring performance in which it returns to almost its original size after one hour.

Therefore, in the main body 110 of the cushioning material 10, since the paper material 11 and the PVA film 13 are not bonded, a gap g exists. The PVA film 13 having stretching and restoring properties stretches and restores in a state of being separated from the paper material 11 having no stretching and restoring properties, and performs a highly elastic buffering action.

As described above, the paper materials 11A,
11B is very sensitive to humidity and extensible
That PVA film 13A to be disposed inside, 13B protective member and ing of. Furthermore, since the calorific value of the PVA film 13 during combustion is as low as about 6,000 cal / g or less, and no harmful substances are generated during combustion, the incineration process can be performed with confidence.

The above description has been given of an example in which the cushioning member 10 is sealed on four sides. Next, a cushioning member 20 forming a seal portion on three sides will be described (see FIGS. 9, 10, and 11). The paper material 21A sent out from the paper material roll 2A and the PVA film roll 4
The PVA film 24A sent out from A is polymerized and cut into predetermined dimensions. Fold the cut pieces in half and seal both sides. Heat sealing is performed while injecting gas from the opening to form a seal portion 250, and the buffer material 20 in which gas is sealed.
To form Alternatively, as shown in FIGS. 12 and 13, the paper material 21A and the PVA film 2 in a polymerized state continuously fed from the paper material roll 2A and the PVA film roll 4A.
4A is folded from both sides to form a seal portion 250a and a seal portion 250b formed in the center portion. Finally, gas is injected from an opening and a seal portion 250c is formed to form a three-sided cushioning material 20 for sealing. 'Form. in this case,
A perforation may be formed at the same time as the formation of the seal portion 250c so that a required number of continuous cushioning materials can be cut off.

The load-bearing characteristics of the cushioning material 20 of the three-side seal and the cushioning material 10 of the four-side seal configured as described above will be examined.
The PVA film has high stretchability and resilience, and the produced cushioning materials 10 and 20 are extremely flexible. When a compressive load is applied to these cushioning members from above (perpendicular to the seal portion), the cushioning members 10 and 20 expand in the horizontal direction. In the seal portions 150 and 250, the PVA films are welded to each other, and the PVA film and the paper material are adhered and hardened to enhance the tensile strength. For this reason, the sealing portions 150, 2
Reference numeral 50 plays a role of a reinforcing frame against horizontal bulging of the cushioning members 10 and 20. Therefore, the periphery (4 sides)
Are completely heat-sealed to form a seal portion.
0, 10 'is prevented from bulging in the horizontal direction,
Large load capacity. On the other hand, the cushioning members 20 and 20 'forming the seal portions on three sides cannot reinforce the swelling on this side in a state where there is no heat seal portion (reinforcement frame) on one side of the periphery. The shock-absorbing materials 20 and 20 ′ are inferior in load-bearing capacity as compared with the shock-absorbing materials 10 and 10 ′ having seal portions formed on four sides.

Next, a strength test was performed on the sealing portion of the cushioning material. A. Testers and measuring instruments used for testing. (1). Seal strength test Seal tester (Heat seal tester, manufactured by Tester Sangyo Co., Ltd., TP-701B trademark) (2). Tensile strength test QC tensile tester (trademark manufactured by Tester Sangyo Co., Ltd.) Digital force gauge (trademark manufactured by IMADA) (3). Leak tester (COSMO, PACKAG
E LEAK TESTER, PL-1100 (trademark) The pulling speed was 100 mm / min.

B. PVA film used for testing. HM _# 35 (trademark) made by Kuraray Co., Ltd .... Saponification degree =
95%, thickness = 35 μm, water soluble. C. Paper material used for the test. (1) calligraphy paper (basis weight = about 34 g / m ² ) (2) kraft paper (basis weight = about 50 g / m ² ) (3) recycled copy paper (recycled paper, basis weight = about 60 g / m ² )
m ² ) D.I. Specimen: See FIGS. (110 mm x 110 mm) paper material 11
Two VA films 13 are superposed to form a seal portion 100 having a width of 2.5 mm at a position 15 mm from the end. Five test pieces having a width of 15 mm are collected from the test piece. Heat sealing condition of the sealing part 100 The heat sealing result is greatly affected by the properties of the PVA film and the paper combined with the sealing pressure, the sealing temperature, the sealing time, and the like. To reduce the pressure, the seal pressure should be 18k with the upper limit of the seal tester being around 90%.
g / cm ² , and measured by changing the sealing temperature, sealing time, and paper material. E. FIG. Environment Room temperature 23 ° C to 24 ° C, humidity about 45%.

Test Method 1. Adhesive strength between paper and PVA film The adhesive strength between the paper and the PVA film after heat sealing was measured (see FIG. 16). The paper material 11 is sandwiched between grippers at 140 mm intervals and pulled. Used paper is vertical (papermaking)
Direction, seal temperature from 170 ° C to 185 ° C, 5 ° C
Step, seal time from 0.5 seconds to 2.0 seconds,
Measurements were taken at 0.5 second intervals. Table 1 shows the average value of the measurement results for each case.

[0021]

[Table 1] The test results show that although the measured values slightly vary, the overall sealing temperature is high, and the longer the sealing time, the stronger the adhesive strength. However, the difference between the maximum and the minimum is about 1.3 times. From this result, it can be said that there is not much difference if the adhesive force between the paper and the PVA film is 170 ° C. or more. The preferred temperature is around 180 ° C.

In the above test, the paper was used in the longitudinal direction (papermaking direction). Here, tensile strength of paper material, paper and PVA
The difference in the adhesive strength between the films in the papermaking (vertical and horizontal) directions was tested as follows. The paper is in the vertical (papermaking) direction,
Fibers are arranged differently in the horizontal direction (perpendicular to the papermaking direction).
It is generally said that the vertical direction is strong. Therefore, recycled copy paper (basis weight of about 60 g / m ² ), kraft paper (basis weight of about 50 g / m ² ), and calligraphy paper (basis weight of about 34 g / m ² ) as test paper materials, In each of the lateral directions, five test pieces each having a width of 15 mm were taken, and the tensile strength was measured with grippers at 180 mm intervals.

Table 2 shows the average value of the measurement results.

[Table 2] From this table, it can be seen that not only the tensile strength differs depending on the type of paper material, but also the strength ratio in the vertical and horizontal directions greatly differs.

On the other hand, Table 3 shows the relationship between the sealing time at a heat sealing temperature of 180 ° C. and the adhesive strength in the vertical and horizontal directions of the paper material.

[Table 3] From the measured values shown in Tables 2 and 3, it can be seen that when the aspect ratio of the tensile strength is large, the aspect ratio of the adhesive strength is also large. For example, calligraphy paper shows the numerical value with the highest aspect ratio of the tensile strength, and also shows the numerical value with the highest aspect ratio of the adhesive strength.

The above test results show that the paper material and the PVA film that are mainly bonded by the hooking effect are less likely to peel in the vertical direction than in the horizontal direction. Therefore, as shown in FIG. 3, when making a rectangular cushioning material, the longitudinal direction of the paper material indicated by the arrow s is arranged in the longitudinal direction of the cushioning material 10 so that the adhesive between the paper material 11 and the PVA film 13 is formed. The strength is increased and a stronger cushioning material can be made.

2. Adhesive Strength Between PVA Films As shown in FIG. 17, the sealing strength between PVA films after heat sealing was measured by pulling the sealing portion 100 of the PVA film 13 at an interval of 140 mm and measuring the tensile strength.

Table 4 shows the measurement results.

[Table 4] The heat sealing temperature is 1 in 5 ° C steps from 160 ° C.
Up to 85 ° C., the heat sealing time was changed from 0.5 seconds to 2.0 seconds at 0.5 second intervals, and the sealing strength was measured.

All of the parts damaged by the tensile test were seal parts. The types of failure are shown in FIG.
In the type (A), the seal portion is peeled off. In the type (B), the PVA film is cut from one end. In the type (C), the PVA films at both ends are cut off. In the type (D), the seal portion is broken. (A) type occurred when the seal strength was weak, and (D) type damage occurred when the seal strength was strong. In the case of the (B) and (C) types of breakage, some seals having low seal strength were also observed. This is considered to be caused by minute cracks when the seal portion 100 becomes hard and a test piece having a width of 15 mm is formed.

When recycled copy paper is used as the paper material, the seal temperature is 170 ° C. and the seal time is 0.5 seconds.
Peeling of the (A) type seal portion occurred. this is,
This indicates that the heat sealing temperature is too low, and that the sealing time is insufficient and the PVA films are not sufficiently welded to each other. From these results, calligraphy paper and kraft paper
The heat seal test at 160 ° C and 165 ° C was not performed. The results shown in the table show that when the sealing temperature is high and the sealing time is long, the sealing strength is high for all the sheets.

According to the above test, the cushioning material 10 has a seal temperature of 170 ° C. to 185 ° C. and a sealing time of 1 second to 2 seconds. When it was arranged, it was found that the sealing portion had strong sealing properties.

Next, the extensibility and the resilience of the PVA film will be examined. Table 5 shows the transition of the thickness (dimension in the direction perpendicular to the seal portion) of the cushioning material when a load is applied to the gas-filled (balloon-shaped) cushioning material and when the load is removed. .

[Table 5] From this table, it can be seen that the cushioning material from which the load has been removed has almost returned to its original thickness.

As described above, the PVA film is rich in extensibility. When a load is applied from above (perpendicular to the seal portion) to the balloon-like cushioning material 10 in which gas is sealed in the main body 110, the PVA film is crushed. The cushioning material 10 has a property of expanding in the horizontal (seal portion 150) direction at the same time when the PVA film is extended.

On the other hand, in the heat seal portion 150, since the PVA films are welded and solidified and the paper material is adhered, this portion is hard and has poor extensibility. in this way,
The seal part 150 plays a role of a prevention part (support frame) for preventing the elongation of the PVA film, and reinforces the load resistance of the cushioning material. In the cushioning material, the cushioning materials 20 and 20 'of the three-side seal portion are those in which one portion of the seal portion (support frame) provided on the peripheral edge is removed, and when a load is applied, as shown in FIG. Since the folded side 22 expands as shown by the imaginary line, the cushioning materials 10 and 1 having the sealing portions formed on the four sides.
The load bearing capacity is lower than that of 0 '.

The cushioning material and the method of manufacturing the cushioning material described in this embodiment have the following effects. (1) Cost Reduction Since the step of applying a PVA solution to paper or laminating a PVA film on paper can be omitted, the production cost of the material can be significantly reduced. (2) Improvement of Lifetime Since there is a gap (g) between the paper material and the PVA film, the risk of occurrence of a fatigue phenomenon occurring during the use process can be significantly reduced, and the life can be prolonged. (3) Good feel The conventional material in which a PVA film is laminated on paper is sensitive to the environment (temperature and humidity), and cures in winter when the temperature becomes dry and low. However, the cushioning material of the present invention is made of paper and PVA. Because the film is separated, the feel of the paper can be maintained regardless of the environment. (4) Improvement of Elasticity Since the cushioning material is configured in a state where the paper and the PVA film are separated, the stretchability and the restoring property of the PVA film can be fully exhibited, and the elastic cushioning material can be obtained.

(5) Improvement of recyclability The used buffer material is immersed in water, and the PVA film is dissolved in water and separated from paper, so that the paper can be recycled as used paper. The PVA film dissolved in water has biodegradability. (6) Low pollution Even when incinerated as general waste, the calorific value is low (6000 cal / g or less), the disposal is easy, and no harmful gas is generated. (7) Flexible handling of changes in paper material In order to apply a PVA solution to paper or laminate a PVA film on paper, it is necessary to operate a manufacturing plant to produce a certain amount, ie, lot production. However, in the present invention, since the paper and the PVA film are polymerized, a small amount of production is possible, and it is possible to flexibly cope with a change in a desired paper material and a production amount.

(8) Regardless of the paper quality The paper quality of the paper material may be any as long as it has a surface protecting effect as a cushioning material.
For example, any paper quality having a basis weight of about 14 g / m ² to 60 g / m ² and having the same softness and strength as commercially available wrapping paper can be used. (9) Practical and decorative properties By applying advertisements for company names, product names, etc., and advertisements 180 on paper, it is possible to advertise the goods to be accommodated, achieve advertisements, and furthermore, provide cushioning materials incorporating decorative elements. Can be made.

(Example) Next, a buffer material was experimentally manufactured by changing the type of paper material. When the paper material and the PVA film are polymerized and heat-sealed, the paper material and the PVA film adhere to each other due to a hooking effect. Therefore, according to this principle, PAV
The paper material is not particularly limited as long as the film can be melted and penetrated into the paper. However, the paper material is required to have appropriate softness and surface strength depending on the use as a cushioning material. The prototype of the cushioning material, a reproduction copy sheet basis weight of about 60 g / m ² (recycled paper), to wrapping paper having a basis weight of about 14 g / m ^2,
The cushioning material was tested with kraft paper, calligraphy paper, various types of wrapping paper used in shops, which were printed and coated on one side, old newspaper, advertisements, paper towels, tissue paper, and the like. Then, when the above test was carried out, it was confirmed that it could be sufficiently used as a cushioning material depending on the application.

In the case of print-coated paper, the coated surface is P
When contacting with a VA film, the adhesiveness deteriorates.
The surface in contact with the film is desirably a surface that has not been subjected to print coating treatment or a surface that has been lightly coated. Also,
Printing ink or a coating film on the surface of wrapping paper or the like, or newsprint, is slightly adhered with the printing ink or coating film at the time of heat sealing. Therefore, it is necessary to take measures to prevent this. For example, the sealing portion is covered with a wrapping paper (basis weight: 14 g / m ² ) to perform a sealing process.

As in this embodiment, a paper material can be freely selected for the cushioning material. Then, a paper material can be selected according to strength, softness, touch, color, and the like, and a cushioning material suitable for the purpose can be formed. In addition, a cushioning material having excellent decorativeness can be formed by using a paper material that can be easily printed including a design such as a commercial advertisement of a product or a company.

[0040]

As described above, the cushioning material of the present invention
Paper material and PVA film are laminated without being laminated, and they are superimposed on each other, and the periphery is formed using a hooking effect, so the elasticity of PVA film, protection and reinforcement by paper material can be achieved independently. It is possible to provide a gas-filled cushioning material having a good feel and a long life. The method of manufacturing the gas-filled buffer material eliminates the step of laminating the PVA film on the paper material, and can economically provide a gas-filled buffer material with good feel and long life.

[Brief description of the drawings]

FIG. 1 is a perspective view of a gas-filled cushioning material having a four-sided seal.

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is a plan view of a gas-filled cushioning material having a four-sided seal.

FIG. 4 is an explanatory diagram of a material delivery mechanism.

FIG. 5 is a perspective view in which materials are superimposed in the process of manufacturing the gas-filled buffer material.

FIG. 6 is an explanatory view of a gas-injected state of a gas-filled buffer material.

FIG. 7 is an explanatory view (four-sided seal) showing another example of the material delivery mechanism.

FIG. 8 is a perspective view showing another example of the gas-filled cushioning material of the four-sided seal.

FIG. 9 is a plan view of a gas-filled cushioning material with a three-sided seal.

FIG. 10 is an explanatory diagram of a material delivery mechanism.

FIG. 11 is a perspective view in which raw materials are superimposed in a manufacturing process of the gas-filled buffer material.

FIG. 12 is an explanatory view showing another example of the material feeding mechanism (3)
Side seal).

FIG. 13 is a perspective view showing another example of a gas-filled cushioning material with a three-sided seal.

FIG. 14 is an explanatory view of a test body.

FIG. 15 is an explanatory diagram of preparation of a test piece.

FIG. 16 is an explanatory diagram of a tensile test.

FIG. 17 is an explanatory view of a tensile test.

FIG. 18 is an explanatory diagram of a damaged state.

FIG. 19 is an explanatory view of breakage of a conventional cushioning material.

[Explanation of symbols]

 10, 10 'Gas-filled cushioning material with four-sided seal 11, 21 Paper material 13, 24 PVA film 20, 20' Gas-filled cushioning material with three-sided seal 110 Main body 100, 150, 250 Sealing part 180 Printing part 150, 1030,1130 point bonding part

──────────────────────────────────────────────────続 き Continuing on the front page (72) Akira Hino, Inventor 504-2 Shinanomachi, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside Hitachi Electronic Service Co., Ltd. (72) Inventor Reiwa Yamagishi 504-2 Shinanomachi, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Within Hitachi Electronics Service Co., Ltd. (72) Inventor Mutsuharu Takesada 504-2 Shinanomachi, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Within Hitachi Electronics Service Co., Ltd. (56) References JP-A-9-267866 (JP, A) JP-A-9 -262935 (JP, A) JP-A-8-282736 (JP, A) JP-A-8-2557 (JP, A) JP-A 63-61917 (JP, U) (58) Fields investigated (Int. . ^7, DB name) B65D 57/00 - 59/08 B65D 81/00 - 81/16 B65D 30/00 - 30/28 B65D 33/00 - 33/38 B31B 1/64

Claims (2)

(57) [Claims] 1. An air bag-shaped cushioning material having a gas-filled main body made of paper and polyvinyl alcohol film and a seal formed on the periphery of the main body. The paper material to be distributed and the polyvinyl alcohol film disposed inside are polymerized without adhesion.
In addition, it is configured to be stretchable and restorable in a separated state by providing a gap between the paper material and the polyvinyl alcohol film ,
Paper is a protective material for polyvinyl alcohol film.
The seal is a cushioning material that is used as an adhesive for paper materials when the polyvinyl alcohol film is melted. 2. A first polyvinyl alcohol film on a first paper material, a second polyvinyl alcohol film on a first polyvinyl alcohol film, and a second polyvinyl alcohol film on a second polyvinyl alcohol film. 2, a step of cutting each of the polymerized paper and the polyvinyl alcohol film into a desired length, and a step of leaving an opening at the edge of each of the polymerized paper and the polyvinyl alcohol film. Forming a seal portion by heating and pressurizing; injecting a gas between the first polyvinyl alcohol film and the second polyvinyl alcohol film from the opening; and sealing the opening. In the polymerization step, the first paper material and the first polyvinyl alcohol film, and the second paper material and the second polyvinyl alcohol film Is polymerized by non-adhesion, the polyvinyl alcohol film is melted in the process of forming the seal portion, and only the edge portions of the first paper material and the second paper material are bonded, and the polyvinyl alcohol film is formed in the gas injection process. When gas is injected between the alcohol films, the paper material other than the edge seal and the polyvinyl alcohol film are separated.
A method of manufacturing a cushioning material that can be stretched and restored , and the paper material is a protection member for a polyvinyl alcohol film.