JP3002664B2 - 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 a method for protecting contents (articles) from vibrations and shocks during packing and transportation of articles.
The present invention relates to a cushioning material interposed in a gap between a packing box and an article.

[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. Japanese Patent Laid-Open Publication No. Hei 7-189183 discloses a cushioning material in which a sheet-like material is formed into a bag, gas is confined and inflated 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 .

[0003] The gas permeability of polyvinyl alcohol (hereinafter PVA) films and coatings is extremely low.
The oxygen permeation amount of the film (degree of saponification = 95%, thickness = 35 μm, water-soluble) when humidified in an environment of 20 ° C. and 65% RH for 2 weeks is 70 ml / m 2 to 24 h-atm. The oxygen permeation amount is an intermediate value between the gas permeation amounts of the biaxially stretched nylon film (thickness: 15 μm) and the PET film (thickness: 12 μm). Focusing on this characteristic of PVA , JP-A-9-267866 describes that PVA
A film is laminated and used as a material of a gas-encapsulated cushioning material. In Japanese Patent Application Laid-Open No. 7-189182,
A VA solution is applied to form a buffer material in the same manner.

[0004]

However, a material obtained by laminating a PVA film on paper is expensive, and almost all of the disposable cushioning materials are expensive. Therefore,
The present invention economically provides a cushioning material having a simple structure and a high cushioning effect.

[0005]

According to the present invention, at least one air bag-shaped cushioning material made of a PVA film in which an air injection hole is adhesively sealed with a small piece of a PVA film having water droplets is formed in a paper bag. It has a housed configuration.

[0006]

Embodiments of the present invention will be described with reference to the drawings. The cushioning material 100 has a paper bag 20 and a cushioning material 10 housed in the paper bag. The paper bag 20 can be used as long as it has a certain degree of flexibility. In this embodiment, a paper material having a basis weight of about 14 g / m ² to a basis weight of about 60 g / m ² was used. The paper bag 20 is a bag provided with an opening 23. The buffer material 10 is formed by enclosing gas inside a bag made of a PVA film.

A method for producing the buffer material 10 will be described (see FIGS. 4, 5, and 6). As the PVA film 11, for example, a film having a degree of saponification of about 95% and a thickness of about 35 μm is used. Two PVs sent from rolls 1A and 1B
The A films 11A and 11B are polymerized, and the ends are heat-pressed with appropriate pressure, temperature, and time (hereinafter referred to as heat sealing) to form a seal portion 110b, and both sides are heat-sealed to a desired size and sealed. Parts 110a, 110c
To form By heat sealing, the PVA films are melt-bonded to each other. Next, the part is heat-sealed while injecting air at an appropriate pressure from the opening to form a seal part 110d, and cut at the center of the seal part to form the buffer material 10. The buffer material 10 may be formed continuously, and a perforation may be formed in the seal portion 110d so that a desired number of pieces can be cut off. Others
The two PVA films 11A and 11B are polymerized, and the polymerized PVA film 11 is cut into an appropriate length. Polymerization P
The VA films 11A and 11B are heat-sealed to form seal portions 110a, 110b and 110c. Next, while injecting air at an appropriate pressure from one side of the opening, the side is heat-sealed to form a seal portion 110d,
There is also a method of forming the buffer material 10.

In addition to the above method, as shown in FIGS.
The PVA film 11C unwound from the roll 1c is folded from both sides, the ends are sealed to form a seal 150b, and the center is sealed to a desired size to form a seal 150a. Then, gas is injected from the opening, and finally, the sealing portion 150c is formed, and the buffer material 15 is formed. This is continuously formed, and the sealing portion 1 is formed.
A perforation may be provided in 50c so that a desired number of pieces can be cut off. In addition, FIG.
As shown in the figure, one PVA film sheet 1D
Fold and seal on two sides to seal parts 160a, 160b
After the gas is injected from the opening, the sealing portion 160c is formed to form the buffer material 16.

Here, an embodiment of a method for forming a seal portion will be described. The formation of the seal portion is performed by heat-sealing the melted PVA films to each other. Therefore, in order to prevent the molten PVA film from adhering to the heat sealing means, the following treatment is taken. (1) A Teflon tape is stuck to a portion corresponding to a seal portion and heat sealed. By heat sealing,
Although the surface of the PVA film is melted, since the Teflon tape is applied, welding of the PVA film to the heat sealing means can be prevented, and reliable welding of the PVA films can be achieved. (2) Cover the portion corresponding to the seal portion with paper. In order to obtain the maximum sealing strength, it is necessary to heat seal at the optimum temperature, pressure and time. However, when the temperature is increased, the melting of the PVA film proceeds, and the molten PVA easily adheres to the heat sealing means. In order to prevent this, the PVA film corresponding to the seal portion is sandwiched between sheets of paper, and heat-sealed from above. By doing so, the molten PVA penetrates and is absorbed by the paper,
Does not adhere to heat sealing means. Further, when the PVA permeates and solidifies the paper, the strength of the seal portion increases, so that the load resistance of the buffer material can be increased. (3) Paper is interposed between PVA films. Since the melted PVA permeates and is adsorbed on the paper, it does not adhere to the heat sealing means, and when the PVA permeates and solidifies on the paper, the strength of the sealing portion is increased and the load resistance of the buffer material can be increased. .

Next, an embodiment of a method for injecting gas into a bag formed of a PVA film will be described. (1) Corner cutting method (see FIG. 10) First, all the openings are heat-sealed. Since this method can heat seal PVA films in a flat state,
Operation becomes easy. The entire periphery (4 sides or 3 sides) is heat-sealed to form seal portions 110a, 110b, 110c,
After forming 110d, the corner 120 is cut.
After injecting air from the cut portion 120, the portion is sealed again to form the seal portion 110e, and the buffer material 10 is created.

[0011] (2) air injection probe method (see FIG. 11) sealed to the sealing portion the entire periphery in Polymerization states in which only put soft paper scrap 30 between PVA film (110
a, 110c,...). Next, air is injected by piercing the air injection needle 50. Then, the needle hole is sealed with a piece of PVA film 40 having a slight water droplet on the surface after the needle is removed, and the buffer material 10 is formed. PVA films are strongly adhered to each other when an appropriate amount of moisture is contained.
The film piece 40 reliably seals the needle hole. In addition, the paper dust 30 prevents the PVA films from adhering to each other, and also prevents the PVA films from penetrating through the bag of the PVA film when an air injection needle is inserted in a later step. The insertion of the air injection needle 50 is desirably at the center. That is, when the needle is stabbed, the central part is the paper scrap 3
Since 0 is present and the interval between the PVA films is large, the risk of accidentally penetrating the bag can be reduced, and the sticking of the sealing PVA film piece 40 after needle removal becomes easy.

(3) Pre-drilling method (see FIG. 12) Before heat sealing, one of PVA films 11A and 11B, for example, PVA film 1
A vent hole 60 is provided in one place of 1A in advance. It is desirable to provide this ventilation hole so as to be located at the center.
PVA films are superimposed on each other to form a seal 1 on the entire periphery.
After forming 10a, 110b, 110c, 110d,
The air blower 70 makes light contact with the air holes 60 provided in the PVA film 11A, or blows air in a non-contact manner. This is based on the same principle as inflating a paper balloon, and gas enters the bag of the PVA film through the vent hole 60 and inflates. After the bag is inflated, the blowing of air is stopped, and the PVA film piece 40 (with water droplets attached) is stuck to the ventilation hole 60 to form the buffer material 10.

Next, the cushioning material 10 constructed as described above will be described.
The strength of the seal was tested. . Heat seal (heat seal) strength test 1 Tester and measuring device used for test (1) Seal tester: Heat seal tester TP-701B (trade name) manufactured by Tester Sangyo Co., Ltd. (2) Tensile strength test QC tensile tester: (Trade name) made by Tester Sangyo Co., Ltd. Digital force gauge: made by IMADA (trade name) (3) Leak tester: PACKAGE made by COSMO
LEAK TESTER PL-1100 (trade name) 2 PVA film used for the test HM # 35 (trade name) manufactured by Kuraray Co., Ltd .... Saponification degree =
95%, thickness = 35μm, water soluble

When the PVA films having a width of 15 mm
heat seal directly with a seal width of
Was formed. A Teflon tape was attached to the heat sealing means at the seal portion, and the seal was sealed with a seal pressure of 10 kg / cm ² . As shown in FIG.
The tensile strength at the time of pulling was measured as m.
An average of 2.5 kgf / 15 mm or more was obtained as the tensile strength of the seal portion at a seal temperature of 175 ° C and a seal time of 1.0 to 1.5 seconds. Also, the melted PVA film did not adhere to the heat sealing means.

When the tensile force of the sealing portion between the 15 mm-wide PVA films 11 is S (Kgf / 15 mm), FIG.
4, a rectangular cushioning material 8 having a width of α mm and a length of β mm
Look at the zero load capacity. The overall perimeter of this cushioning material is 2 ×
(Α + β). Therefore, the load bearing capacity F of this buffer material is obtained by the following equation (1). F = 2 × (α + β) × S / 15 (Kgf) Equation 1

For example, if α = β = 150 and S = 2.0, F = 2 × (150 + 150) × 2.0 / 15 = 80
Kgf. This indicates that the cushioning material is a square cushion material having a side of 15 cm and can withstand a static load of 80 kg. From this, if the value of the tensile strength S is 2.00 or more, a buffer material that can sufficiently withstand the transport of heavy objects can be obtained.

The extensibility and the resilience of the PVA film The extensibility of the PVA film is extremely large, and is 1.8 kgf /
The elongation rate increases from about 15 mm, and 2.0 kgf / 1
It shows an increase of about 40% at 5 mm. On the other hand, regarding the restoring property, the image is immediately restored to the original at about 1.8 kgf / 15 mm. Further, although the elongation was slightly more than 40% at 2.0 kgf / 15 mm, it almost returned to the original size about one hour after the tensile force was removed. As described above, the buffer material 10 made of the PVA film has a sufficient load-bearing capacity, and has elongation and restoring properties.

Looking at the load-bearing characteristics of the three-sided cushioning material and the four-sided sealing material, the PVA film is rich in elongation and resilience, and the prepared buffer material 10 is very flexible. In. When a load is applied to these cushioning materials and compressed in the vertical direction, the cushioning materials expand horizontally. Since the PVA films are welded and hardened to each other and have a strong tensile strength, the heat seal portion serves as a reinforcing frame against the horizontal bulging of the buffer material.
Therefore, in the cushioning material 10 (see FIG. 4) in which the entire periphery (four sides) is heat-sealed, these sealing portions serve as a reinforcing frame for preventing the cushioning material 10 from bulging in the horizontal direction. Contributes significantly to load capacity. on the other hand,
In the case where there is no seal portion on one side of the periphery shown in FIGS. 8 and 9 (three-side seal), one side of the reinforcing frame is chipped, and the reinforcement of the bulge in this portion is insufficient, so that the load resistance is increased. Is inferior to a four-sided cushioning material in which a sealing portion is formed on the entire periphery.

The cushioning material of the present invention comprises a balloon-like cushioning material 10, 15, 16 formed of a PVA film.
One or more pieces are stored in the paper bag 20, and the opening of the paper bag is closed by bonding or the like to form the cushioning material 100.

Next, the sealing of the paper bag 20 containing the buffer material 10 made of a PVA film will be described. Formation of cushioning material 100 (see FIG. 2). One or a plurality of buffer materials 10 are stored in the paper bag 20, the opening 23 is closed, and the buffer material 100 is formed. Opening 23
Closing is performed by gluing, bonding with a double-sided tape, forming the sealing portion 25 by stapling, or forming one side of the paper bag 20 long and bending it to form the sealing portion 27.

In addition, there are the following sealing methods. (1) The narrow PVA film piece 17 is inserted into the opening 23. Heat sealing is performed on the paper bag 10. The PVA film piece 17 melts and penetrates into the paper tissue, solidifies, and adheres the paper in the opening 23 (see FIG. 15). (2) One or more small pieces 19 of the PVA film are inserted into one or more openings, and are spot-sealed using a point welding type handy heat sealing means to close the opening 23 (FIG. 16).
reference).

Next, the cushioning material 100 shown in this embodiment will be described.
(See FIG. 17). The load-bearing characteristics of a cushioning material (referred to as a cushioning material 100A) formed of one balloon-shaped cushioning material and a cushioning material (referred to as a cushioning material 100B) in which n cushioning materials are stored in a paper bag having the same size as the cushioning material 100A.

In the cushioning material 100B, each cushioning material is equally loaded. Here, if the seal strength of the seal portion of the cushioning material 10 is identical with S (Kgf / 15mm), load bearing F _A cushioning material 100A _{is, F A = 2 (W +} V) S / 15 (Kg), a buffer load bearing F _B of timber 100B becomes _{F B = n {2 (w} + v) S / 15} (Kg). The ratio γ between the two is given by Equation 2.

(Equation 1)

The cushioning material 100B has the same width (W = w),
Assuming that two buffer materials (n = 2) each having a half length (V = 2v) are stored in a paper bag, γ is given by Expression 3 from Expression 2.

(Equation 2)

As a result, the load resistance of the buffer material B is increased by (W / (W + V)) as compared with the buffer material A. The cushioning material described above shows an example in which a plurality of cushioning materials are stored in a paper bag,
As shown in FIG. 18, in a paper bag 20 having an opening 23,
A configuration in which one buffer material 10 made of a PVA film having substantially the same size as a paper bag may be stored.

The cushioning material thus configured uses paper and a PVA film as raw materials, and (1) has extremely low gas permeability. (2) Heat sealing can be performed, and sufficient strength can be obtained as a gas-filled buffer material. (3) The paper can be adhered by inserting between the paper and heat sealing. (4) Intermediately saponified PVA is water-soluble and biodegradable. (5) Low calorific value when burned (about 6,000 c
al / g or less). (6) It has excellent elasticity and resilience. And the properties of the PVA film,

(1) High ecology: Recycled paper can be used, and recycled as used paper. (2) Protection from moisture (such as sweat) when handling cushioning materials. (3) Surface protection of cushioning material (balloon-like PVA film) in use as a cushioning material (during transportation and storage). (4) Excellent decorativeness (easy printing including designs such as advertisements of products and companies). (5) Flexible selection, strength, and feel (flexibility, texture, color, outside) can be flexibly selected according to the purpose. By utilizing the characteristics of paper such as the above, it is possible to economically provide a durable cushioning material that is easy to manufacture and dispose.

[0028]

The cushioning material of the present invention has the following effects.
You. (1) Cost reduction Apply PVA solution to paper or wrap PVA film on paper.
Higher manufacturing cost of cushioning material because the process of mining can be omitted.
Can be reduced in width and provide economical cushioning material.  (2) Strength and size can be flexibly selected as cushioning materialWind The size and strength of the buffer material in a boat shape, stored in a paper bag
The number can be selected flexibly according to the purpose. (3) Improvement of recyclability PVA is dissolved in water by putting used buffer material in water.
Paper can be separated from used paper and recycled as used paper.
Wear. PVA dissolved in water has biodegradability.
You. Also, even when incinerated as general waste,
Low (6000 cal / g or less) and easy to dispose. (4) Improving elasticity Buffer made of PVA film laminated on paper
Although the material is poor in elasticity, the present invention uses the outer paper material and the inner P
Separate balloon-shaped cushioning material made of VA film
To fully demonstrate the extensibility and resilience of PVA film
And the elasticity is improved. (5) Improving reliability With a single large bag of cushioning material, if even one location is damaged, the entire bag
Loses the cushioning function, but multiple cushioning materials are used as in the present invention.
Redundancy is increased by storing in one bag, and the reliability of cushioning material
The performance is improved. (6) Lifetime improvement With a cushioning material laminated with PVA on paper,
Narrowing occurs due to the hardness of the material.
Stress concentrates on the part,
And air leakage was caused..The present invention
So, there is a gap between the outer paper bag and the inner cushioning material
Because it can move independently, it can avoid the cause of damage
You. (7) Decorativeness It does not matter whether the outer paper bag is printed or coated.
So, you can use company name and product advertisements,
It can be used to make cushioning material with rich decorative properties. (8) Lightweight Most of the volume of the cushioning material is air.
I can make it.

[Brief description of the drawings]

FIG. 1 is a sectional view of a cushioning material according to the present invention.

FIG. 2 is a sectional view of a cushioning material according to the present invention.

FIG. 3 is a perspective view of a cushioning material according to the present invention.

FIG. 4 is a perspective view of a cushioning material according to the present invention.

FIG. 5 is an explanatory view of a manufacturing method of a buffer material.

FIG. 6 is an explanatory view of a manufacturing method of a buffer material.

FIG. 7 is an explanatory view of a manufacturing method of a buffer material.

FIG. 8 is a perspective view of a cushioning material.

FIG. 9 is an explanatory view of a manufacturing method of a buffer material.

FIG. 10 is an explanatory view of a method of filling gas into a buffer material.

FIG. 11 is an explanatory view of a method of filling gas into a buffer material.

FIG. 12 is an explanatory view of a method of filling gas into a buffer material.

FIG. 13 is an explanatory diagram of a tensile strength test of a seal portion.

FIG. 14 is a plan view of a test piece.

FIG. 15 is an explanatory diagram of a sealing form of an opening of a cushioning material.

FIG. 16 is an explanatory diagram of a sealing form of an opening of a cushioning material.

FIG. 17 is a comparative explanatory diagram of load-bearing characteristics.

FIG. 18 is an explanatory view of a cushioning material in which one cushioning material is accommodated in a paper bag.

[Explanation of symbols]

 10, 15, 16 Buffer material 11 PVA film 20 Paper bag 23 Opening 110, 150, 160 Sealing 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 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-5-51069 (JP, A) Registered utility model 3033858 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B65D 81/07

Claims (1)

(57) [Claims] 1. A cushioning material characterized in that at least one cushioning material in the form of an air bag formed of a polyvinyl alcohol film having an air injection hole adhesively sealed with a small piece of polyvinyl alcohol film with water droplets is accommodated in a paper bag. .