JP3284004B2 - Cushioning packaging 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 packaging material having an excellent cushioning property using an air tube, and more particularly to a packaging material made of a cubic or rectangular parallelepiped (hereinafter, referred to as a box) made of an air tube, a cardboard box, or the like. Related to interior materials used.

[0002]

2. Description of the Related Art In order to protect an article having low impact resistance, a packaging material utilizing the cushioning property of air filled in an air tube, or a cushion made of an air tube used by being stored in a cardboard box. Although the material has already been put to practical use, a packaging material using an air tube that retains a perfect box shape has not yet been known.

A packaging material using an air tube can be flattened and folded before use as compared with a styrofoam packaging material, so that less storage space is required and transportation costs can be reduced. Furthermore, compared to styrofoam packaging materials, it is lightweight and low cost,
It is excellent in pressure resistance, heat insulation, heat retention and cold insulation, easy to dispose after use, and if you use a transparent sheet material, the packaged item can be seen directly from the outside. There are advantages and demand has increased significantly in recent years.

An example of the above-mentioned air tube packaging material is the one disclosed in Japanese Utility Model Laid-Open No. 1-176073. FIG. 13 shows the developed shape of the conventional type. By overlapping two resin sheets and fusing the peripheral portion, a bag-shaped member capable of containing air inside is formed. A packaging material in which the inside of the bag-like member is fused in a streak shape by a heat sealing method to form a large number of partitions, thereby forming an air tube. Then, the bag-shaped members are arranged as shown to form an upper lid portion A, a side wall portion B, and a bottom wall portion C, and another side wall portions D, E, F are connected around the bottom wall portion C. And air was injected from the inlet indicated by reference numeral 2 to
Air is filled through the path indicated by 3 to inflate the whole.
Then, the side walls B, D, E, and F are raised around the bottom wall C, and then the top cover A is covered.

[0005] However, the conventional packaging material has a problem that when air is injected, a difference in dimension occurs between the surfaces of the rectangular parallelepiped, and it is not possible to form an accurate rectangular parallelepiped without distortion. That is, as shown in FIG. 13, this packaging material is composed of six surfaces A to F. However, since each air tube expands like a pillow by injection of air, the length of the short side of both ends of the air tube is reduced. On the other hand, the length of the long side on both sides of the air tube does not shrink so much, and the dimensions before the air injection are almost maintained. For this reason, in the surface B constituting the bottom wall portion, the side in contact with the surface E and the surface F tends to be considerably shortened by air injection. However, the sides of the E-plane and the F-plane that are in contact with the B-plane substantially maintain the dimensions before the air injection even when the air injection is performed. Therefore, the air injection causes a dimensional mismatch between the B-side, the E-side, and the F-side, and these three sides are distorted, so that an accurate rectangular parallelepiped packaging material cannot be formed.

Incidentally, Japanese Utility Model Laid-Open No. 5-35756 discloses a packaging material made of an air tube as shown in FIG. In this case, both ends of a packaging sheet in which long air tubes 111 and short air tubes 112 are alternately formed are adhered to each other to form a cylinder, and the cylindrical packaging material sheet is folded in two, and two side wall portions are formed. It is configured to be folded into a V-shape to form a box shape, and furthermore, a bottom wall portion is formed by bonding the lower edge on the inner surface side of the opposed air tube portion in the V-shaped folded portion.

The inventors made a prototype of the packaging material of the present invention based on the disclosure of the Japanese Utility Model Publication and injected air.
It was confirmed that the bottom wall did not spread, a rectangular parallelepiped shape could not be obtained, and the independence was lacking. More specifically, when air is injected, the long air tube 111 expands, and a considerable thickness is generated on each of the surface portions constituting the bottom wall portion. Therefore, each of the surface portions may overlap with the bottom wall portion. It becomes impossible, the bottom wall does not spread, and it cannot stand alone. In addition, it is considered that one of the causes of such a problem is that the long air tube 111 has a restoring force due to the injection of air and is extremely difficult to bend.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the conventional packaging material, and its purpose is to reduce the inflation and restoring force of each air tube. In view of the above, it is an object of the present invention to provide a packaging material having excellent self-sustainability by removing distortion due to a dimensional difference at the time of injecting air into each surface and obtaining an accurate cubic or rectangular parallelepiped form.

In order to achieve the above object, a cushioning wrapping material according to the present invention is a cubic or rectangular parallelepiped cushioning wrapping material in which a plurality of air tubes are connected in parallel. To form four side walls,
At the four corners of the rectangular bottom wall, air tubes are arranged on both sides of a line that bisects the interior angles of the four corners so as to be orthogonal to each other. So as to prevent the occurrence of a dimensional difference at the time of injecting air between the bottom wall portion and the side wall portion, so that an accurate cubic or rectangular parallelepiped cushioning packaging material can be obtained. It was made.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the accompanying drawings. (Example 1) FIG. 1 is a developed view for obtaining a cushioning packaging material having a rectangular parallelepiped bottom wall, and shows a state before air injection. That is, two transparent films 2A and 2B cut into the shape shown in FIG. 1 are superimposed, and the two films are fused together at an edge portion and a streak-like seal portion 6 is formed.
To form a large number of air tubes 5A, 5B between the films. Referring to the developed shape shown in FIG.
The long side wall portion, the two short side wall portions C, and the bottom wall portion D, four bottom wall portions are defined and formed on the bottom wall portion by oblique sides indicated by reference numerals 3A to 3H. This hypotenuse 3A-H
Are formed by forming the ends of three air tubes obliquely at an angle of 45 degrees. still,
Fusion margins 4 are provided on the oblique sides 3A to 3H of the bottom wall, the right side of the long side wall on the right side, and the left side of the short side wall on the left side.

On each of the above surfaces, streak-like air tubes 5A and 5B having a constant width and defined by a seal portion 6 are arranged in parallel with their long sides in contact with each other. At the boundary with the continuously provided bottom wall, each air tube 5B
A partial seal 7 is formed which forms a constriction to facilitate folding. The upper ends of the air tubes 5A and 5B are provided with film-type check valves 8A and 8B, and the upper right end of the upper lid portion is provided with each air tube 5A through each check valve 8A.
An air inlet 9A for injecting air into A is provided at an upper right end of the long side wall on the right side, and an air inlet 9B for injecting air into each air tube 5B through each check valve 8B is provided. I have.

FIG. 2 is a sectional view of the two transparent films. 2A is an inner film arranged inside after the packaging material 1 is completed, and 2B is an outer film arranged outside. The inner film 2A is made of nylon 21
And a composite film obtained by extrusion lamination or dry lamination of polyethylene 22. The outer film 2B is a composite film in which nylon 24 is disposed between polyethylenes 23 and 25, and is subjected to extrusion lamination or dry lamination. First, the two transparent films, the inner film 2A and the outer film 2B, are superimposed, and the sealing margin 4 and all the sealing parts are heat-sealed. As shown in FIG. 3, the heat sealing is performed by overlapping the polyethylene 22 side of the inner film 2A and the polyethylene 23 side of the outer film 2B. In the drawing, arrows indicate locations where press and heat sealing are performed.

Next, the right side of the right long side wall B and the left side of the left short side wall B are overlapped with each other so that the outer film 2B is disposed inside the packaging material, to form a bag. In addition, the central seal portion 10 of the two short side wall portions c is folded into the inside of the bag shape, and the seal portions at the adjacent boundaries of the respective side wall portions are folded. FIG. 4 shows an AA cross section of FIG. 1 after the folding operation. Further, due to the folding operation, the hypotenuses 3A overlap with 3H, 3B with 3C, 3D with 3E, and 3F with 3G, and the fusion margin of each hypotenuse also overlaps. FIG. 5 is a sectional view taken along line BB of FIG. 1 showing this state.

After the folding operation as shown in FIGS.
The heat sealing of the margin 4 is performed while pressing from above and below. The temperature of the heat seal is lower than the melting point of nylon and higher than the melting point of polyethylene. In FIG. 6 which is an enlarged cross-sectional view of a portion C in FIG. 5, a fusion margin 4 is made of nylon 21, polyethylene 22/23,
Nylon 24 and polyethylene 25 are stacked and arranged. Press and heat seal heating
The opposing fusing margins 4 are pressed against each other on the polyethylene 25 side and fused to each other to reach the melting point of polyethylene.

However, in FIG. 5, the welding margins 4 on the two oblique sides of the bottom wall folded inward at the seal portion 10 are pressed against each other by a press and heated, but the heat sealing temperature is lowered. Since the melting point of the nylon 21 arranged on the outer side of each fusion margin 4 on the hypotenuse of the bottom wall is not reached, fusion is not performed. In this way, by configuring the materials of the two sheets constituting the packaging material with different melting points, the heat sealing process after the folding operation can be performed only once. The reason why nylon is laminated on the two transparent films is that the heat sealing process after the folding operation can be completed only once, and that the air tube 5 is used.
This is also to obtain a barrier effect of preventing air from leaking from the air. Further, since nylon has higher strength than polyethylene, laminating nylon can prevent bursting of the sheet of the packaging material due to sharp projections or the like.

Next, the side wall portions B and C and the bottom wall portion D of the packaging material having undergone the heat sealing process are turned over. This is because, by turning over, the sealing margin 4 is not exposed to the outside after the air is injected, and the bottom becomes flat. Also, by turning over,
The inner film 2A located on the outside of the bag is located inside the packaging material, and the outer film 2B located on the inside of the bag is located outside the packaging material. Become.

Next, air is injected from the air injection ports 9A and 9B. The injected air is supplied to each air tube 5A, 5B
Is sent through the check valves 8A and 8B. Check valve 8
A and 8B prevent the air once sent into the air tube from flowing backward and leaking from the air inlets 9A and 9B. Further, since the check valve is provided in each air tube, there is an advantage that even if one air tube ruptures, the air in the other air tube does not leak.

Each air tube expands in a pillow shape by the air injection operation. FIG. 7 is a perspective view showing a state after air injection. As described above, each of the hypotenuses 3A to 3H is formed such that the ends of three air tubes are formed obliquely at an angle of 45 degrees, and the air tubes are arranged orthogonally. , The reduction ratio of the dimension of each hypotenuse is the same, and there is no dimensional difference between the hypotenuses. Therefore, a flat bottom without distortion can be obtained. FIG.
FIG. 4 is a bottom view of the completed packaging material according to the present embodiment. Symbol E is a bottom wall boundary. Also, no distortion occurs due to air injection in the upper lid part A and the respective side wall parts B and C. Each air tube 5B is constricted by the seal 7 and is easily bent.

Although the present embodiment constitutes a rectangular parallelepiped packaging material, a cubic packaging material can be easily obtained by changing the number of air tubes. FIG. 9 is a bottom view of the cubic packaging material. As shown in the figure, the bottom portion is formed of four right-angled triangle bottom wall portions whose long sides are in contact with the lower side of the side wall portion. The oblique sides to the respective bottom walls are formed by forming the ends of the same number of air tubes at an angle of 45 degrees. In addition, a code | symbol G is a bottom wall part boundary.

Further, the aspect ratio of the rectangular parallelepiped can be handled by changing the number of air tubes. Also in this case, it is necessary that the hypotenuse of each bottom wall is formed by forming the end of the same number of air tubes obliquely at the same angle. The height of the rectangular parallelepiped can be changed by changing the length of the long side of the air tube.

Further, in the inner film 2A,
In place of nylon 21, stretched nylon or stretched polyester may be used.In place of polyethylene 22, linear polyethylene or ethylene-vinyl acetate copolymer resin may be used. . Also,
In the outer film 2B, stretched nylon or stretched polyester may be used instead of nylon 24, and linear polyethylene or ethylene-vinyl acetate copolymer may be used instead of polyethylenes 23 and 25. A resin or the like may be used.

Further, in this embodiment, since the transparent film is used, there is an advantage that the packaged object can be directly viewed from the outside. -If the demand for heat insulation / cooling is high, use an aluminum foil laminated film, aluminum evaporated film, or colored film.

(Embodiment 2) FIG. 10 shows an embodiment of a packaging material according to the present invention in which an upper lid and a main body are formed separately.

An upper lid 31 and a main body 32 having an outer dimension substantially the same as the inner dimension of the upper lid when air is injected. The upper lid 33 of the upper lid 31 and the main body 32
Similarly to the packaging material of the first embodiment, the bottom wall portion 34 is composed of four surfaces having oblique sides formed by forming the ends of the same number of air tubes obliquely at a common angle.

According to this embodiment, unlike the first embodiment, since the respective surfaces of the packaging material are not distorted and the main body has the outside dimensions substantially similar to the inside dimensions of the top lid, Is securely fixed. That is, when the inside of the upper lid side wall and the outside of the main body side wall are pressed against each other, the upper lid is securely fixed by the restoring force of the air tube crushed at the time of mounting.

(Embodiment 3) FIG. 11 is a developed view of a rectangular parallelepiped box-shaped cushioning packaging material according to another embodiment before air injection. The packaging material 41 is composed of two nylon films 42A and 42B cut into the shapes shown in the developed views. Each of the two cut films has a configuration in which four side walls are continuously provided on each side of the square bottom wall. Fusion margins 44 are provided on both short sides of each side wall.

On each of the side wall portions, a streak-like air tube 43 having a constant width defined by a seal portion 48 is arranged in parallel in the vertical direction. The air tubes 43 are disposed so as to be orthogonal to each other at equal boundaries. At the boundary between each side wall and the bottom wall, each air tube 43 is provided with a partial seal 49 forming a constriction for facilitating bending. The partial seal 49
In each of the air tubes 43, a gap for supplying air to the air tube in the bottom wall portion is provided.

First, the two nylon films are overlapped with each other, and the sealing margin 44 and all the sealing portions are heat-sealed. Next, the partial seal 49 is folded,
Further, the welding margins 44 located on the short side of each side wall portion are folded so as to be exposed to the outside of the packaging material. Then, the sealing margins 44 are heat-sealed to each other. After the heat sealing process is completed, the side wall and the bottom wall of the packaging material are turned upside down, and air is injected from each air injection port 47 to complete the packaging material. This embodiment is suitable for a packaging material in which the upper lid and the main body are configured separately as described in the second embodiment.

(Embodiment 4) FIG. 11 is a developed view of a rectangular parallelepiped box-like cushioning packaging material according to another embodiment before air injection. The packaging material 51 is composed of two nylon films 52A and 52B each cut into a shape shown in a developed view. Each of the two cut films has a configuration in which four side walls are continuously provided on each side of the square bottom wall. Fusion margins 54 are provided on both short sides of each side wall.

On each of the side wall portions, a streak-like air tube 53 having a constant width defined by a seal portion 58 is arranged in parallel in the lateral direction. A square-shaped air tube is provided so that the air tube 53 is orthogonal to the boundary that divides the inner angles of the four corners into two equal parts. Each air tube 53 of the bottom wall is divided into four parts, and is formed so that air sent to each side wall through the air inlet 57 and the check valve 55 is sent to the bottom wall through the gap 56. Have been. At first,
The two nylon films are overlapped with each other, and the sealing margin 54 and all the sealing portions are heat-sealed. Next, the welding margins 54 located on the short side of each side wall are folded so as to be exposed to the outside of the packaging material. And the fusion 5
4 are heat-sealed. After the heat sealing process is completed, the side wall and the bottom wall of the packaging material are turned over, and
Inject air from to complete. As in the third embodiment, this embodiment is suitable for a packaging material in which the upper lid and the main body are formed separately as described in the second embodiment.

[0031]

According to the present invention, there is an advantage that even if the air tube expands due to the injection of air, no distortion occurs in each plane constituting the packaging material. That is, in the case of a rectangular parallelepiped or a cube, each air tube is continuously arranged at the boundary between the side wall portion and the bottom wall portion, and the bottom portion is divided into four at the bottom wall portion. The hypotenuse of the wall is
Since the end portions of the same number of air tubes are formed obliquely at the same angle and the respective air tubes are arranged orthogonally, the size is not affected by the expansion of the air tubes. Therefore, a flat bottom is obtained,
High independence of packaging material.

Further, according to the present invention, the two sheets positioned inside and outside the packaging material are laminated with two or more materials having different melting points, so that the heat sealing after the folding operation is performed. The process can be completed only once. Furthermore, by injecting air after turning over the side wall portion and the bottom wall portion of the packaging material after the heat sealing process is completed, a fusion bottom of the bottom wall portion is not exposed to the outside, and a flat bottom portion can be obtained. .

Further, the packaging material according to the present invention, which comprises an upper lid having a side wall portion and a main body having an outer size substantially the same as the inner size of the upper lid at the time of injecting air, is provided between the inner side of the upper lid side wall. , By pressing the outside of the body side wall,
Due to the restoring force of the crushed air tube at the time of installation,
The upper lid can be securely fixed.

[Brief description of the drawings]

FIG. 1 is a developed view of a rectangular parallelepiped cushioning packaging material according to a first embodiment of the present invention before air injection.

FIG. 2 shows an inner film 2A and an outer film 2B of FIG.
FIG.

FIG. 3 is an inner film 2A and an outer film 2B of FIG.
FIG. 3 is a conceptual cross-sectional view showing a state in which are superimposed and heat sealed.

FIG. 4 is a conceptual diagram of the AA cross section of FIG. 1 after the folding operation.

5 is a conceptual sectional view taken along the line BB in FIG. 1 after the folding operation.

FIG. 6 is a partially enlarged view of C in FIG. 5;

FIG. 7 is a perspective view showing a state after air injection of the cushioning packaging material of FIG. 1;

FIG. 8 is a bottom view of the cushioning wrapping material of FIG. 1 after air injection.

FIG. 9 is a bottom wall view of the cubic cushioning packaging material after air injection.

FIG. 10 is a perspective view of a cushioning packaging material in which an upper lid and a main body according to a second embodiment of the present invention are configured separately.

FIG. 11 is a development view of a rectangular parallelepiped box-shaped cushioning packaging material according to a third embodiment of the present invention before air injection.

FIG. 12 is a development view of a rectangular parallelepiped box-shaped cushioning packaging material according to a fourth embodiment of the present invention before air injection.

FIG. 13 is a development view of a packaging material disclosed in Japanese Utility Model Laid-Open No. 1-176073.

FIG. 14 is a perspective view of a packaging material disclosed in Japanese Utility Model Laid-Open No. 5-35756.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Packaging material 2A Inner film 2B Outer film 3A-H Oblique side 4 Fusion margin 5A, B Air tube 6 Seal part 7 Partial seal 8A, B Check valve 9A, B Air inlet 10 Central seal part 21, 24 Nylon 22, 23, 25 Polyethylene 31 Upper lid 32 Main body 33 Upper lid 34 Bottom wall 41 Packaging material 42A, 42B Nylon film 43 Air tube 44 Fuse margin 45 Check valve 46 Gap 47 Air inlet 48 Seal part 49 Partial seal 51 Packaging material 52A, 52B Nylon film 53 Air tube 54 Fuse margin 55 Check valve 56 Gap 57 Air injection port 58 Seal section A Top cover B Long side wall C Short side wall D Bottom wall E Bottom wall boundary F Bottom wall G Bottom wall boundary

Continuation of the front page (72) Inventor Yoshiharu Shimozato 2339-1 Shoda-cho, Hisai City, Mie Prefecture (72) Inventor Hiroaki Nojin 50, Honmachi, Omata-cho, Mie Prefecture, Japan (56) References JP-A-7-41051 (JP) , A) Japanese Utility Model Showa 57-35275 (JP, U) Japanese Utility Model Showa 48-77304 (JP, U) Japanese Utility Model Showa 5-16671 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB) Name) B65D 81/10

Claims (5)

(57) [Claims] 1. A cubic or rectangular parallelepiped cushioning packaging material entirely composed of air tubes, wherein a plurality of air tubes are connected in parallel to form four circumferential side walls, and the four air tubes are formed at four corners of a rectangular bottom portion. Air tubes are arranged so as to be orthogonal to each other on both sides of a line that bisects the inner angles of the four corners, and the arrangement direction of the air tubes at the bottom is made to match the arrangement direction of the side walls. A cushioning packaging material characterized by the following. 2. A box body having an open top surface is formed of a cubic or rectangular parallelepiped cushioning packaging material having a plurality of air tubes connected in series, and an upper lid having the same form as the box body is opened. The cushioning wrapping material according to claim 1, wherein the cushioning wrapping material is provided. 3. The cushioning packaging material according to claim 1, wherein diameters of the air tubes are all substantially the same. 4. The cushioning packaging material comprises two sheets constituting the inside and outside of the packaging material, and the two sheets are laminated with two or more materials having different melting points. The cushioning packaging material according to any one of claims 1 to 3, wherein: 5. The cushioning packaging material according to claim 1, wherein a fusion piece is provided at the boundary, and the fusion piece is exposed inside the packaging material.