JP2003072851A - Flat airtight bag body which is leak-suppressed and freely bendable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress any leakage of the filled air and loss of the function of a bag body, and to increase the bendability at the same time in an airtight bag body of flat shape with a large number of slender air chambers continuously arranged which is used for a cushioning material, a heat insulating material or the like by filling air or the like. SOLUTION: In the airtight bag body of a flat shape in which a partition wall forming member 3 disposed between heat-bonding bag walls 21 and 22 facing each other are alternately welded to inner surfaces of the bag walls facing each other to form air chambers 8 separated by partition walls 6 and 6" in parallel, a communication section 12 in which the partition wall 6 having communication holes 10 is disposed to communicate the air chambers with each other and a non-communication section 13 in which the partition wall 6" having no communication holes 10 is disposed not to communicate the air chambers with each other are alternately arranged, a spouting inlet 9 is provided for each communication section, leakage of air from pin holes or breakage formed in the bag wall is limited to the communication section of the part while no leakage is present from the other section, loss of the function of the airtight bag body 1 is suppressed, and the non-communication section is easily bent since no air is filled therein.

Description

Detailed Description of the Invention

[Field of Industrial Application] The airtight bag according to the present invention maintains a flat shape when filled with air or the like, and when transporting an easily fragile article or an article avoiding an impact, etc. It is useful as a cushioning material that can be attached to and to absorb the impact, as a substitute for various foams that have been a problem in waste pollution. Moreover, since it has a heat insulating property and a heat insulating property as well as a buffer property, it can be widely used in various consumer fields. Also, not only air but also liquid with a large specific heat is filled to keep it warm,
It can also be used as a heat insulating material.

[Prior Art] Japanese Patent Application Laid-Open No. 200 by the present inventor
0-272620 "Airtight bag body that maintains a flat shape" is an airtight bag body formed of a heat-fusible bag wall, in which a partition wall is formed by another piece, a tube-shaped material, a sheet-shaped material, or the like to form a plurality of bag chambers. However, each partition wall is provided with a plurality of slits so that all the bag chambers communicate with each other, and it has a flat shape as a whole. ,
Although it is used as a cushioning material or the like, the filled air or the like tends to spread the bag wall of each bag chamber, making it difficult for the entire bag body to bend both vertically and horizontally. Also, if a pinhole or breakage occurs in a part of the bag wall, air etc. in each part of the bag will pass through the communication holes of each partition wall one after another, leaking out of the bag from the pinhole or breakage, The whole loses its function.

[Problems to be Solved by the Invention] In the present invention, a heat-fusible partition wall forming material is interposed between opposing heat-fusible bag walls, and the partition wall forming material is alternately formed on both bag walls. In this way, a plurality of partition walls are formed so as to keep a constant space between both bag walls, and air chambers are formed between the partition walls to keep them independent of each other. It becomes a shaped airtight bag and is used as a buffer etc. by filling it with air etc. However, when air etc. is filled, the bag wall and partition walls generate strong tension due to the pressure, and the bag itself is in the vertical direction. Also, the flexibility such as bending in the lateral direction is lost, making it difficult to use as a buffer body. In addition, there is a risk that the entire filling may leak due to pinholes or breakage that occurs in part of the bag wall, and the function of the bag may be lost.

On the other hand, if the leakage of the filler due to the pinhole or the breakage is limited to a very limited range and is not a loss of the function as a whole, it may be actually acceptable. Of.

[Means for Solving the Problems] A flat shape airtightness in which a partition wall and an air chamber are formed between both bag walls from a heat-sealable bag wall and a heat-sealable partition wall forming material which face each other. In a flexible bag, in order to prevent the bag from losing its function due to leakage of fillers such as air from pinholes or breakage that occurs in some bag walls, how to deal with it depends on how to limit the leak amount. Come different.

First, it is the strictest to allow only leakage of air from the air chambers where pinholes or breaks have occurred, but in order to deal with this, communication between the air chambers is not allowed at all. However, since it is not possible to inject and fill air, etc., a communication hole is provided at a position near the peripheral line of each partition wall, and filling is performed through this, but after the filling is completed, A method of cutting off the communication between the air chambers after injection and filling is inevitable by a method of providing a disconnection line for separating each communication hole from the air chamber by heat fusion. However, in order to heat-bond a bag filled with air or the like, there is a risk that pinholes are likely to occur at the boundary of the fusion line. What to do is a requirement.

[0007] In many cases, it is often said that leakage from only a small number of air chambers in the vicinity of the air chambers where pinholes or tears occur does not lead to loss of function of the entire airtight bag. There is a situation in which a communication section consisting of a small number of air chambers that communicate with each other through a communication hole provided in a partition is used as a unit, and each air chamber communicates only within that section but does not communicate with other sections. Then, it is possible to limit the leakage to that section.

In forming the airtight bag, when the partition walls are arranged in a pattern in which a small number of the partition walls having the communication holes are arranged and the partition walls without the communication holes are arranged on both sides, the communication holes are formed. Each air chamber communicates with each other in a section sandwiched between partition walls where no space is provided, and one communication section is formed, and an injection port is provided for each such communication section to individually inject and fill air or the like. Leakage of air, etc. due to pinholes and tears is limited to one communication section and does not extend to the entire bag.

A single partition wall may be provided with no communication hole which is a boundary between the communication sections to be arranged. However, if the number of partition walls is plural, a non-communication section composed of air chambers that do not communicate with the communication sections on both sides is formed. Since the portion is not filled with air or the like, expansion of the bag wall due to air pressure is small, the degree of freedom is high, and bending is easy. In addition, it is possible to disconnect without affecting the communication section on both sides.

Therefore, in forming the bag body, if the communicating sections and the non-communicating sections are arranged alternately, leakage of air or the like due to pinholes or breaks is limited to a narrow range called one communicating section. In the non-communication section, it is possible to bend and cut freely.

The installation of the non-communication section provides longitudinal bending, that is, flexibility due to an axis extending along the air chamber, but in order to obtain lateral bending, that is, flexibility due to an axis orthogonal to the air chamber, A strip-shaped non-communicating portion that is orthogonal to is provided.

[Operation] In the airtight bag according to the present invention, the partition walls that hold the two bag walls together keep the two bag walls at a constant interval, and the bag body maintains a flat shape as a whole. The tensile strength disperses and counteracts the internal pressure exerted on the walls of both bags and keeps the pressure resistance and cushioning of the bag high.

The above operation is described in "Japanese Patent Laid-Open No. 2000-27267".
The airtight bag according to the present invention is the same as the "0" bag, but the airtight bag according to the present invention minimizes the amount of air leaking from pinholes or breakage generated in a part of the bag wall, and the bag is leaked. It can be said that one of the characteristics is to prevent the loss of function of the.

Further, by making a part of the air chambers non-communicating or by providing a non-communication zone orthogonal to the air chamber row, it is possible to increase the degree of freedom of the part so that bending and folding can be performed freely. When used as a cushioning material, etc., it can meet various conditions.

It can be said that it is a great feature that the sections separated by the cutting line passing through the non-communication section or the non-communication zone can be combined to meet the application of the three-dimensional shape.

[0016] In order to cope with the severe condition that the leakage range is limited to the air chamber of that portion alone, it is necessary to use a sealer for heat fusion to heat-seal a part of the bag wall. Under the relaxed condition that leakage is limited to a narrow communication section, there are cases where the number of injection ports increases and the injection operation increases, but the injection amount does not change and the required time greatly increases and the operation becomes complicated. There is nothing.

[Embodiment] Embodiment 1. In the embodiment shown in FIGS. 1 and 2, the bag walls 21 and 22 of the airtight bag body 1 and the partition wall forming material 3 are 100 μm.
Made of polyethylene film, and the size of the bag is 5
The width of the partition wall forming material is 00 mm and the width is 1200 mm, and the partition wall forming material is bent into a saw-tooth shape at a pitch of 25 mm between the opposing bag walls, and the alternate contact sections 5 are closely bonded to the inner surfaces of both bag walls by the bonding lines 41 and 42. The partition wall forming material of the portion between the sections restrains both bag walls and forms the air chamber 8,
6 ". The space inside the airtight bag is divided by the partition walls and the air chambers 8 are arranged in parallel at a pitch of 25 mm, and both ends of each air chamber are closed by peripheral lines 71 and 73 orthogonal to the air chamber row. The partition walls include a partition wall 6 having a communication hole 10 for communicating between the air chambers and a partition wall 6 ″ having no communication hole 10, and an array of three partition walls 6 and three partition walls 6 ″. The four air chambers, which are alternately arranged and are separated by the partition wall 6, communicate with each other by a communication hole 10 to form a communication section 12, and an injection port 9 is provided for each communication section. The air chambers do not communicate with each other and form a non-communication section 13. The airtight bag 1 is filled with air or the like in each communication section, but if a pinhole or breakage occurs in a part of the bag wall, only the communication section in that part leaks, but that section is a bag. The airtight bag does not lose its function as a whole, remaining only a part of the whole.

The bag wall in the non-communication section 13 is not stretched by filling with air or the like, and can be bent at all.

Example 2. In the first embodiment shown in FIGS. 1 and 2, the bag body is bendable along the axis parallel to each air chamber in the non-communication section 13, but should be bent along the axis orthogonal to each air chamber. Is difficult Example 2 shown in FIGS. 3 and 9
Is a bag body in which a bag wall and a partition wall are integrally fused by a heat-sealing line orthogonal to each air chamber to form a non-communication zone 14 having a width of 50 mm. Since the bags do not communicate with each other, the upper and lower bags are symmetrically provided with the communication section 12, the injection port 9 and the non-communication section 13. However, in the non-communication zone, the bag is bent in the vertical direction. Is free.

Example 3. In the bending line 23 passing through the middle of the non-communication zone of the bag body provided with the non-communication zone 14 described in Example 2, the upper and lower bag bodies are folded so as to overlap with each other, and the middle line of the two non-communication sections 13 that overlap each other is bent. The side lines 24 and 25 and the bending line 2 which are formed by cutting the sheet and joining it by heat fusion or other means.
A pocket-like airtight bag body as shown in FIG.

Example 4. As shown in FIG. 5, the bag of Example 2 has cutting lines 15 and 16 passing through the upper and lower non-communication sections and a bending cutting line 1 that sequentially passes through the upper non-communication section, the non-communication zone, and the lower non-communication section.
By cutting with 7 and cutting out the bag sections 18 and 19, and joining the vertical sides 29 and 30 of each bag section, etc.,
A hexahedral expanded schematic bag body 31 as shown in FIG. 6 is formed and bent at each non-communication section and a portion corresponding to a non-communication zone to obtain a hexahedral cushioning material or the like.

Embodiment 5. In the bag body according to the configuration of the first or second embodiment, it is possible to form a long bag body by continuously forming an alternating arrangement of the communication sections 12 and the non-communication sections 13 and tailor it to roll. As shown in FIG. 8, it is put in a case, fed out for a required length, cut at the portion of the non-communication section 13, and used. In this embodiment, the winding tailoring is 1000 mm wide and 50 m long.

Example 6. In each of the above-described embodiments, each partition wall 6 of each communication section 12 is provided with a communication hole 10 that communicates between the air chambers. The communication holes are provided on the respective partition walls from the peripheral lines 73 to 1 The position should be ~ 2 cm. After injecting air or the like from the injection port 9 to fill the inside of the bag, the bag wall and the partition wall forming material inside of the peripheral line 73 from the line where the communication holes are arranged by 2-3 cm, that is, the partition wall forming material, are heat-sealed by the blocking line 11. , Disconnect all communication between each air chamber. As a result, the leakage of air or the like from the pinholes or the breakage that occurs in the bag wall is limited to only the air chamber in that portion, and a bag body with extremely high safety can be obtained.

The inlet used in each of the embodiments is most preferably the actual inventor's Japanese Utility Model Publication No. 53-44579 "pressure tight valve for airtight bag", but it has a non-return property and a hermetic property. Other valve openings can also be used.

In the drawings showing the respective embodiments, the non-communication section and the non-communication zone are shaded to clearly distinguish them from other parts.

[Effects of the Invention] The airtight bag according to the present invention has the following practical effects. First, airtight bags having various flatnesses can be obtained by selecting the width of the partition wall and the arrangement interval. Second, since there is no break or break in the joining line, there is very little risk of breakage or pinholes due to stress concentration.
Thirdly, since the pressure applied to the bag wall is dispersed and supported by the distribution of the partition walls, the pressure resistance is high. No. 4 does not exert a large pressure on the article, and even if the article has irregularities, it is possible to maintain a relatively stable contact. 5 is the most excellent function, when a sharp object contacts from the outside and a pinhole or breakage occurs, air leakage will occur only from the air chamber of that part or a limited number of air chambers in the vicinity. It remains and retains extremely high reliability as a cushioning material. No. 6 has no flow or unevenness of air, etc., and the force for supporting articles is extremely stable. Seven can be continuously and automatically manufactured from a polyethylene film. Eight can be manufactured with a relatively large size and large area. Nine is freely bendable in the non-communication section or non-communication zone, and can perform functions such as cushioning according to various shapes and usage conditions. Ten can obtain suitable secondary processed products according to various requirements.

[Brief description of drawings]

FIG. 1 is a plan view of an air-filled and sealed state according to a first embodiment.

FIG. 2 is a cross-sectional view taken along the line AA of FIG.

FIG. 3 is a plan view of a second embodiment.

FIG. 4 is an assembled perspective view of a third embodiment.

FIG. 5 is a plan view of a fourth embodiment.

FIG. 6 is an assembly plan view of a fourth embodiment.

FIG. 7 is a plan view of long roll tailoring of Example 5.

8 is a cross-sectional view taken along the line BB of FIG.

9 is a cross-sectional view taken along the line CC of FIG.

[Explanation of symbols]

1. Airtight bag 21.22. Bag wall 3. Partition forming material 41.42. Joining line 5. Close contact section 6. Partition wall with communication holes 6 ". Partition without communication hole 71.73. Peripheral line 8. Air chamber 9. Inlet 10. Communication hole 11. Break line 12. Communication section 13. Non-communication section 14. Non-communication zone 15.16. Cutting line 17. Bending cutting line 18.19. Bag section 23. Bend line 24.25. Lateral line 26. Long tailored airtight bag 27. Winding tailoring roll 28. Case 29.30. Vertical side 31. Hexagonal development figure bag

Claims (5)

[Claims] 1. A heat-sealable partition wall forming material 3 is disposed between opposing heat-sealable bag walls 21, 22, and the partition wall forming material 3 is a joining line 41 orthogonal to the peripheral lines 71, 73. 42 is alternately fused to the bag walls 21 and 22 in a saw-tooth shape to form the close contact section 5 and the partition walls 6 and 6 ″ to restrain the bag wall and divide the airtight bag body into the air chambers 8 arranged in parallel. Although formed, the partition walls 6 having the communication holes 10 are arranged so that the air chambers communicate with each other and can be filled with air or the like from the inlet 9 provided in a part of the air chambers, and the communication holes 10. The airtight bag body is characterized in that the partition walls 6 ″ which are not provided are arranged so that the air chambers do not communicate with each other and the non-communication sections 13 that can be bent and cut are alternately arranged. 2. A heat-sealable partition wall forming material 3 is arranged between opposing heat-sealable bag walls 21, 22, and the partition wall forming material 3 is a joining line 41 orthogonal to the peripheral lines 71, 73. 42 is alternately fused to the bag walls 21 and 22 in a saw-tooth shape to form a close contact section 5 and partition walls 6 and 6 ″, and the bag wall is restrained and the airtight bag body is divided into parallel air chambers 8. However, a non-communication zone 14 which is orthogonal to the air chamber 8 and whose both sides are closed by heat fusion and which does not communicate with the other part of the bag body is provided. A partition wall 6 provided with holes 10 is arranged so that the air chambers communicate with each other and a communication section 12 capable of being filled with air or the like from an inlet 9 provided in a part of the air chambers, and a partition wall having no communication hole 10 provided therein. Characteristic is that 6 "are arranged, and the air chambers are not connected to each other, and the non-communication sections 13 that can be bent and cut are alternately arranged. Airtight bag that does. 3. A bending line 23 passing through the middle of the non-communication zone 14 of the airtight bag body 1 according to claim 2, is bent so that the upper and lower bag bodies are overlapped, and two sets of the upper and lower non-communication sections 13 which overlap each other are formed. A pocket-shaped airtight bag body characterized in that it is surrounded by side lines 24, 25 formed by heat-sealing and cutting the intermediate line and the bent line 23. 4. The airtight bag body according to claim 2, wherein the cutting lines 15 and 16 passing through the upper and lower non-communication sections 13, the upper non-communication section 13, the non-communication zone 14 and the lower non-communication section 13 are sequentially arranged. Airtightness characterized by cutting out bag body segments 18, 19 by a bending cutting line 17 passing through, and fusing the vertical sides 29, 30 of each of these bag body segments together to form a hexahedral expanded schematic bag body 31. Sex bag. 5. The communication hole 10 is provided along the peripheral lines 71, 73 in each communication section 12 of each airtight bag body according to each of the above claims, and after the air or the like is injected, the communication holes 10 are formed along the peripheral line. A method for preventing air leakage of an airtight bag body, characterized by heat-sealing a disconnection line 11 that disconnects each communication hole from each air chamber so that the air chambers 8 do not communicate with each other.