JP2008296988A - Plastic shock-absorbing air bag and manufacturing method of the same - Google Patents

Plastic shock-absorbing air bag and manufacturing method of the same Download PDF

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JP2008296988A
JP2008296988A JP2007146329A JP2007146329A JP2008296988A JP 2008296988 A JP2008296988 A JP 2008296988A JP 2007146329 A JP2007146329 A JP 2007146329A JP 2007146329 A JP2007146329 A JP 2007146329A JP 2008296988 A JP2008296988 A JP 2008296988A
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plastic
air bag
melting point
cushioning material
air
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Masaki Iwasaka
正基 岩坂
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Kawakami Sangyo KK
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Kawakami Sangyo KK
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/723—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/439—Joining sheets for making inflated articles without using a mould
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • B29C66/83221—Joining or pressing tools reciprocating along one axis cooperating reciprocating tools, each tool reciprocating along one axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
    • B29C66/83411—Roller, cylinder or drum types
    • B29C66/83413—Roller, cylinder or drum types cooperating rollers, cylinders or drums
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/731—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the intensive physical properties of the material of the parts to be joined
    • B29C66/7311—Thermal properties
    • B29C66/73115—Melting point
    • B29C66/73116—Melting point of different melting point, i.e. the melting point of one of the parts to be joined being different from the melting point of the other part
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/735—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the extensive physical properties of the parts to be joined
    • B29C66/7352—Thickness, e.g. very thin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7138—Shock absorbing

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Buffer Packaging (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide an shock-absorbing air bag having a structure in which a number of air chambers are formed by partitioning two sheets of plastic films by heat seal in a vertical direction and horizontal direction, the air chambers being coupled to each other in a planar shape, and thereby the shock-absorbing air bag being good in appearance and its shock-absorbing ability can be maintained for a long time, and to provide a manufacturing method of the shock-absorbing air bag capable of preventing troubles related to the heat seal during manufacturing. <P>SOLUTION: In the manufacturing method, a two laminated plastic film member in which one layer thereof has a melting point higher than that of the other layer is used. Two of the laminated members are laminated together such that the layers of the lower melting point are facing each other. The laminated members are then passed between a number of pairs of heat seal rollers 7A arranged at a constant interval to simultaneously form a plurality of heat seal portions 4 in parallel in the vertical direction. After a slight delay, air is injected between the two laminated members while the laminated members are sandwiched between a pair of seal bars 8A at a predetermined interval to sequentially form a plurality of heat seal portions 5 running in parallel at a constant interval in the horizontal direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、プラスチックフィルムの積層材を用いた空気袋緩衝材と、その製造方法に関する。 The present invention relates to an air bag cushioning material using a laminated material of a plastic film and a manufacturing method thereof.

２枚のプラスチックフィルムの間に、空気を吹き込みながら縦および横方向に平行なヒートシール部を形成することにより、投影面がほぼ長方形、とくに正方形の空気室が平面状に多数連結された空気袋緩衝材が知られている。この空気袋緩衝材は、通常、空気室の一片が５０〜１００ｍｍ、厚さが２０〜４０ｍｍであるが、空気室の大きさはかなり広い範囲から任意に選ぶことができるから、緩衝材のなかでも、充填材として、包装箱と被包装物との空間に充填するのに適している。 An air bag in which a large number of air chambers each having a substantially rectangular plane, especially a square plane, are connected by forming a heat seal portion parallel to the vertical and horizontal directions while blowing air between two plastic films. Buffer materials are known. In this air bag cushioning material, one piece of air chamber is usually 50 to 100 mm and thickness is 20 to 40 mm. However, since the size of the air chamber can be arbitrarily selected from a fairly wide range, However, it is suitable as a filler for filling the space between the packaging box and the article to be packaged.

しかし、この空気袋緩衝材には、製造時のヒートシールにともなうトラブルと、使用時の耐久性の欠如という問題があった。ヒートシールにともなう問題は、加熱温度の調節が精密に行なわれないと、理想的なヒートシールをすることができない。すなわち、温度が高すぎれば、シールバーに溶融した樹脂や焼けカスが付着して製品の外観を損なうだけでなく、場合によっては空気室にピンホールができて、局部的な空気抜けの原因となる。一方、温度が低すぎれば、シール不良を引き起こして、空気室間を空気が移動可能になり、緩衝材としての機能と信頼性が低下する。また、従来の空気袋緩衝材は、通常は安価で加工が容易なポリエチレンとくに低密度ポリエチレンを材料とすることが多いが、ポリエチレンはガスバリヤ性が低いために、緩衝材として使用中に、とくに荷重がかかっている空気室内の空気が減って緩衝能力が低下し、底つきなどの問題が起こることが少なくない。 However, this air bag cushioning material has problems associated with heat sealing during production and lack of durability during use. The problem with heat sealing is that an ideal heat seal cannot be achieved unless the heating temperature is precisely adjusted. In other words, if the temperature is too high, not only will the molten resin or burnt residue adhere to the seal bar and impair the appearance of the product, but in some cases a pinhole may be formed in the air chamber, causing local air leakage. Become. On the other hand, if the temperature is too low, a sealing failure is caused and air can move between the air chambers, and the function and reliability as a cushioning material are lowered. In addition, conventional air bag cushioning materials are usually made of polyethylene that is cheap and easy to process, especially low density polyethylene. However, polyethylene has a low gas barrier property, so it is particularly difficult to apply load during use as a cushioning material. The air in the air chamber is reduced, the buffer capacity decreases, and problems such as bottoming often occur.

プラスチックフィルムを材料とし、多数の密閉された空気室を形成した緩衝材としては、いわゆるプラスチック気泡シートが、広く使用されている。プラスチック気泡シートは、通常、溶融押出ししたプラスチックフィルムを、回転ロール形状の真空成形機により加工して多数のキャップを有するキャップフィルムを形成し、そのキャップの底面に平坦なバックフィルムを融着させて密閉された空気室を形成することにより製造されている。出願人は、このプラスチック気泡シートにおいて、キャップフィルムおよびバックフィルムを二層の積層材としたものを製造する方法を開発し、すでに開示した（特許文献１）。
特許３７８８１９３号 A so-called plastic bubble sheet is widely used as a cushioning material made of a plastic film and forming a number of sealed air chambers. Plastic foam sheets are usually produced by processing a melt-extruded plastic film with a rotary roll-shaped vacuum forming machine to form a cap film having a large number of caps, and fusing a flat back film to the bottom of the cap. It is manufactured by forming a sealed air chamber. The applicant has already developed and disclosed a method of manufacturing a plastic foam sheet in which a cap film and a back film are made of a two-layer laminate (Patent Document 1).
Japanese Patent No. 3788193

その製造方法は、２基の押出機とそれに接続した２個の積層Ｔダイを使用し、一方の押出機で相対的に融点の高いプラスチックを溶融し、他方の押出機で相対的に融点の低いプラスチックを溶融して、それぞれの溶融プラスチックを２個の積層Ｔダイに供給し、２個の積層Ｔダイの温度を高融点のプラスチックが加工できる限度で低い温度に保って、それぞれの積層Ｔダイから高融点のプラスチックと低融点のプラスチックとの積層フィルムとして押し出し、押し出された一方の積層フィルムを、真空成形ロールに接する側に高融点のプラスチックを位置させて真空成形することによりキャップフィルムとし、他方の積層フィルムをバックフィルムとして、キャップフィルムに融着する側に低融点のプラスチックを位置させて実施することを特徴とする。 The manufacturing method uses two extruders and two laminated T dies connected thereto, one of the extruders melts a relatively high melting point plastic, and the other extruder has a relatively high melting point. The low plastic is melted, and each molten plastic is supplied to the two laminated T dies, and the temperature of the two laminated T dies is kept at a low temperature as long as the high melting point plastic can be processed. Extruded from a die as a laminated film of high melting point plastic and low melting point plastic, and one extruded laminated film is vacuum formed with the high melting point plastic positioned on the side in contact with the vacuum forming roll to form a cap film. The other laminated film is used as a back film, and a low melting point plastic is placed on the side to be fused to the cap film. And butterflies.

この製造方法の利点は、キャップフィルムおよびバックフィルムの、真空成形ロールおよび融着のための加圧ロールに接する側のプラスチックが高融点であり、相互に融着する側のプラスチックが低融点であるから、共押出しの樹脂温度は高融点のプラスチックが加工できる限度で、かつ真空成形ロールによりキャップを形成する時点で、可塑性を保っている限度で低くてよく、そのような温度条件では、高融点のプラスチックは、真空成形ロールによりキャップを成形したところで直ちに固化するから、真空成形ロールからの型離れが容易であって、成形を高速で行なうことができ、低融点のプラスチックの側は、その温度において十分に融着可能であるから、２枚のフィルムの融着は完全であるという、生産能率と製品の信頼性の向上にある。 The advantage of this manufacturing method is that the plastic on the side of the cap film and the back film that contacts the vacuum forming roll and the pressure roll for fusing has a high melting point, and the plastic on the fusing side has a low melting point. Therefore, the resin temperature of co-extrusion may be low as long as the high melting point plastic can be processed, and at the time of forming the cap with the vacuum forming roll, it may be low as long as the plasticity is maintained. The plastic of this type is immediately solidified when the cap is molded by the vacuum forming roll, so it is easy to remove the mold from the vacuum forming roll, and the molding can be performed at a high speed. In order to improve production efficiency and product reliability, the two films are completely fused. That.

発明者は、上記のプラスチック気泡シートの構造を、同じくプラスチック製である空気袋緩衝材に適用することを考えた。それにより、ヒートシール作業が容易になって製造時のトラブルが未然に防止でき、かつ、材料とするフィルムにガスバリア性を与えることができて緩衝能力が長続きする製品が得られるという、利益が得られるはずであるということに着目したのである。実験の結果、この見込みは当たっていることが確認でき、本発明に至った。 The inventor considered applying the structure of the plastic bubble sheet to an air bag cushioning material, which is also made of plastic. As a result, heat sealing work can be facilitated and trouble during manufacturing can be prevented, and a product that can provide a gas barrier property to the film as a material and has a long buffering capacity can be obtained. We focused on what should be done. As a result of the experiment, it was confirmed that this expectation was true, and the present invention was achieved.

したがって本発明の目的は、２枚のプラスチックフィルムを材料とし、縦方向および横方向のヒートシールにより区画された多数の空気室が、平面状に連結された構造をもつ空気袋緩衝材において、その製造時のヒートシールに関して起こり得るトラブルを未然に防止するとともに、空気室に封入された空気の逸出が少なく、荷重がかかった状態で使用を続けても、緩衝性能が長期にわたって維持される空気袋緩衝材と、その製造方法を提供することにある。 Accordingly, an object of the present invention is to provide an air bag cushioning material having a structure in which a large number of air chambers divided by vertical and horizontal heat seals are connected in a planar shape using two plastic films as materials. Air that prevents problems that may occur with heat sealing during manufacturing, and prevents the air enclosed in the air chamber from escaping so that the buffer performance can be maintained over a long period of time even when used under load. A bag cushioning material and a manufacturing method thereof.

本発明の空気袋緩衝材は、図１および図２に示すように、２枚のプラスチックフィルム（２，３）の間に空気を封入しながら、縦方向および横方向にヒートシール（４，５）を行なって得られる、多数の空気室（６）が平面状に連結された構造の空気袋緩衝材（１）において、プラスチックフィルム（２，３）が少なくとも２層の積層材（２Ａ＋２Ｂ，３Ａ＋３Ｂ）であり、最外層のプラスチック（２Ａ，３Ａ）の融点が、最内層のプラスチック（２Ｂ，３Ｂ）の融点よりも高いことを特徴とする。 As shown in FIGS. 1 and 2, the air bag cushioning material of the present invention heat-seals (4, 5) in the vertical and horizontal directions while enclosing air between two plastic films (2, 3). In the air bag cushioning material (1) having a structure in which a number of air chambers (6) are connected in a planar shape, the plastic film (2, 3) is a laminated material (2A + 2B, 3A + 3B) having at least two layers. The melting point of the outermost plastic layer (2A, 3A) is higher than the melting point of the innermost layer plastic layer (2B, 3B).

この空気袋緩衝材を製造する本発明の方法は、図３および図４に示すように、少なくとも２層のプラスチックフィルムの積層材（２，３）であって、一方の表面に位置するプラスチック（２Ａ，３Ａ）の融点が他方の表面に位置するプラスチック（２Ｂ，３Ｂ）の融点よりも高いものを２枚、融点の低いプラスチックフィルム（２Ｂ，３Ｂ）を向かい合わせて重ね、一定の間隔で配置した多数のヒートシール用ローラーの対（７Ａ，７Ｂ）の間を走らせることにより、縦方向に複数の平行なヒートシール部（４）を同時に形成し、それにわずか遅れて、２枚の積層材の間に空気を吹き込みつつ、一対のシールバー（８Ａ，８Ｂ）で所定の間隔を置いて挟むことにより、横方向に一定の間隔で平行に走る複数のヒートシール部（５）を順次形成して、投影面がほぼ長方形の空気室（６）を多数設けることを特徴とする。 As shown in FIG. 3 and FIG. 4, the method of the present invention for producing this air bag cushioning material is a laminate (2, 3) of at least two layers of plastic film, which is a plastic ( 2A, 3A) have two melting points that are higher than the melting point of the plastic (2B, 3B) located on the other surface, and two low-melting plastic films (2B, 3B) are placed facing each other. By running between a large number of heat-sealing roller pairs (7A, 7B), a plurality of parallel heat-sealing portions (4) are formed in the longitudinal direction at the same time. A plurality of heat seal portions (5) that run in parallel at regular intervals in the lateral direction are formed in order by sandwiching them at a predetermined interval with a pair of seal bars (8A, 8B) while blowing air between them. Te, projection plane characterized in that to provide a large number generally rectangular air chamber (6).

本発明の空気袋緩衝材が、本来もつ利益を享受できることはもちろんである。たとえば、前記のプラスチック気泡シートは、キャップの成型時にその稜の部分が引き延ばされて、他の部分より薄くなるため、空気室の圧縮強度が低いことや、その部分からの空気の逸出が容易であるという弱点が避けられないのに対し、空気袋緩衝材は製造時に薄肉化する部分はないから、フィルムの厚さを完全に利用することができる。観点を変えれば、空気袋緩衝材はプラスチック気泡シートと比較して、一定の荷重に対して同じ強度をもつ緩衝材を、より薄い材料で、つまりより低いコストで提供することができ、廃棄やリサイクルに関しても、いっそう有利な条件が与えられる。 Of course, the air bag cushioning material of the present invention can enjoy the inherent benefits. For example, the above-mentioned plastic foam sheet is stretched at the edge of the cap when the cap is molded and becomes thinner than the other parts, so that the compressive strength of the air chamber is low and air escapes from that part. However, since the air bag cushioning material does not have a thinned portion at the time of manufacture, the thickness of the film can be fully utilized. From a different point of view, air bag cushioning can provide a cushioning material with the same strength for a given load with a thinner material, that is, at a lower cost compared to a plastic foam sheet, and can be disposed of at a lower cost. More advantageous conditions are also given for recycling.

空気袋緩衝材を形成する２枚のプラスチックフィルムとして積層材を使用し、融点の低いプラスチックフィルム（２Ｂ，３Ｂ）の側を向かい合わせ、融点の高いプラスチックフィルム（２Ａ，３Ａ）を外側に位置させてヒートシールするから、シールロール（７Ａ，７Ｂ）およびシールバー（８Ａ，８Ｂ）の温度として、融点の高いプラスチックの融点より低いが融点の低いプラスチックの融点よりは高い、適切な値を選択することにより、フィルムが融けてシールバーに付着したり、穴が空いたりする心配はなく、完全な融着をさせることができる。焼け焦げなどの発生はなく、外観の良好な製品が得られる。 Laminate is used as two plastic films forming the air bag cushioning material, the low melting point plastic films (2B, 3B) face each other, and the high melting point plastic films (2A, 3A) are positioned outside Therefore, the temperature of the sealing roll (7A, 7B) and the sealing bar (8A, 8B) is selected to be an appropriate value that is lower than the melting point of the high melting point plastic but higher than the melting point of the low melting point plastic. Thus, there is no fear that the film melts and adheres to the seal bar, or a hole is formed, and complete fusion can be achieved. A product with good appearance can be obtained without the occurrence of scorching.

２種のプラスチックの融点の差が大きいほど、シールバーが取り得る温度の幅は広くなり、操業が容易になる。常用のヒートシール装置は、よほど精密に製造して十分に制御して使用しない限り、部分によって若干の温度差が生じることは避けられないが、本発明によれば、ヒートシール装置の部分による加熱温度の違いは、融点の幅の中に吸収することができるから、それほど精密な装置である必要はなく、かつ、その使用に当たっても、高度の制御を要しない。装置の製作に高いコストがかかることはなく、運転に熟練を要しない。 The greater the difference between the melting points of the two types of plastics, the wider the temperature range that the seal bar can take, and the easier the operation. A normal heat seal device is inevitable that some temperature difference will occur between parts unless it is manufactured with sufficient precision and is well controlled, but according to the present invention, heating by the part of the heat seal device is inevitable. The difference in temperature can be absorbed within the melting point range, so it does not need to be a very precise device and does not require a high degree of control even when used. The device is not expensive to manufacture and requires no skill to operate.

積層フィルムの最内側以外の層を融点の高いプラスチックで構成することは、一般にガスバリア性をもつフィルムを配置することを可能にするから、本発明の空気袋緩衝材は、ガスバリア性をもたせることが容易であり、それによって、空気室内の空気が外部に逸出する速度を顕著に低くすることができる。とくに、空気袋緩衝材に荷重がかかった状態が続くと、空気が速やかに追い出される傾向があるが、本発明の空気袋緩衝材は、そのような使用環境によく耐える。 Since the layers other than the innermost layer of the laminated film are made of a plastic having a high melting point, it is generally possible to arrange a film having a gas barrier property. Therefore, the air bag cushioning material of the present invention can have a gas barrier property. It is easy, and the speed at which the air in the air chamber escapes to the outside can be significantly reduced. In particular, if the air bag cushioning material continues to be loaded, the air tends to be expelled quickly, but the air bag cushioning material of the present invention can withstand such a use environment well.

最外層のプラスチックの融点と、最内層のプラスチックの融点との差は、大きい方が有利であるが、一般には８０℃以上の差があることが好ましく、また、この程度の差があれば、常用のヒートシール装置の部分による温度の差および制御上の問題なく、本発明を実施することができる。 The difference between the melting point of the outermost layer plastic and the melting point of the innermost layer plastic is advantageously larger, but generally a difference of 80 ° C. or more is preferable, and if there is a difference of this level, The present invention can be implemented without temperature differences and control problems due to portions of the conventional heat sealer.

積層材を形成するプラスチックフィルムは、３層以上のものを選択することができるが、通常は内外２層のものが入手も、また使用も容易である。その場合、内層の材料としては、融点が低くヒートシール適性が高い低密度ポリエチレンが最適である。外層としては、より高融点のプラスチックから任意のものが選択できるが、ナイロンおよびエチレン−酢酸ビニル共重合体が、融点の差からいっても、またガスバリア性を付与したいときはその目的にとっても、最適である。ポリプロピレンも有利に使用できる。 The plastic film for forming the laminated material can be selected from three or more layers, but usually two layers of inner and outer layers are easy to obtain and use. In that case, as the material of the inner layer, low density polyethylene having a low melting point and high heat sealability is optimal. As the outer layer, any one of plastics having a higher melting point can be selected. However, nylon and ethylene-vinyl acetate copolymer can be used for the purpose when the gas barrier property is imparted even if the difference between the melting points is desired. Is optimal. Polypropylene can also be used advantageously.

下記の二層プラスチック積層フィルム（共押し出しにより製造）を材料として、
［融点の低いプラスチックフィルム］
低密度ポリエチレン（密度が０．９２、融点が約１１９℃） 厚さ４０μｍ
［融点の高いプラスチックフィルム］
ナイロン 厚さ１０μｍ
図３および図４に示した方法により、ヒートシール幅が縦横とも５ｍｍ、ピッチが縦横とも１５０ｍｍで、空気室の厚さが４０ｍｍの空気袋緩衝材を製造した。ヒートシール装置のローラー部分の温度は１３０〜１３５℃、バー部分の温度も１３０〜１３５℃で、操業中はこの温度範囲にあるように制御した。ヒートシール装置へのプラスチック材料の付着や焼けこげの発生はなく、また空気室にピンホールは認められなかった。 The following two-layer plastic laminated film (manufactured by coextrusion) is used as a material.
[Plastic film with low melting point]
Low density polyethylene (density is 0.92, melting point is about 119 ° C) thickness 40μm
[Plastic film with a high melting point]
Nylon thickness 10μm
An air bag cushioning material having a heat seal width of 5 mm in both vertical and horizontal directions, a pitch of 150 mm in both vertical and horizontal directions, and an air chamber thickness of 40 mm was manufactured by the method shown in FIGS. The temperature of the roller part of the heat sealing apparatus was 130 to 135 ° C., the temperature of the bar part was also 130 to 135 ° C., and the temperature was controlled to be within this temperature range during operation. There was no adhesion of plastic material to the heat-sealing device and no burning, and no pinholes were found in the air chamber.

得られた緩衝材は、耐荷重強度が０．２Ｋｇ／ｃｍ２であり、一辺が２０ｃｍの片を平らな台と平らな板の間において１０Ｋｇの荷重をかけ、１０ヶ月の間放置した。厚さの変化を、台と板の間隔の変化を測定することにより調べた。間隔の減少は３０％であった。比較のため、厚さが前記二層のプラスチック積層フィルムの厚さに匹敵する５０μｍである、低密度ポリエチレン単層の材料で同じ仕様の空気袋緩衝材を製造し、同じ試験を行なったところ、上記の間隔の減少が８０％に達した。 The obtained buffer material had a load bearing strength of 0.2 kg / cm 2 , and a piece of 20 cm on a side was subjected to a load of 10 kg between a flat table and a flat plate and left for 10 months. The change in thickness was examined by measuring the change in the spacing between the table and the plate. The decrease in spacing was 30%. For comparison, an air bag cushioning material having the same specifications was manufactured from a low-density polyethylene single-layer material having a thickness of 50 μm, which is comparable to the thickness of the two-layer plastic laminated film, and the same test was performed. The reduction in the spacing reached 80%.

本発明の空気袋緩衝材の一例を示す平面図。The top view which shows an example of the air bag cushioning material of this invention. 本発明の空気袋緩衝材の一例を示す、図１のＩ−Ｉ方向の断面図。Sectional drawing of the II direction of FIG. 1 which shows an example of the air bag cushioning material of this invention. 本発明の製造方法を説明する図であって、製造中の空気袋緩衝材の平面図。It is a figure explaining the manufacturing method of this invention, Comprising: The top view of the air bag cushioning material in manufacture. 本発明の製造方法を説明する図であって、製造中の空気袋緩衝材の断面図。It is a figure explaining the manufacturing method of this invention, Comprising: Sectional drawing of the air bag cushioning material in manufacture.

符号の説明Explanation of symbols

１ 空気袋緩衝材
２，３ プラスチックフィルム（積層材）
２Ａ，３Ａ 融点の高いプラスチック（最外層）
２Ｂ，３Ｂ 融点の低いプラスチック（最内層）
４ 縦方向のヒートシール ５ 横方向のヒートシール
６ 空気室
７Ａ，７Ｂ ヒートシール用ローラーの対 ８Ａ，８Ｂ ヒートシールバーの対 1 Air bag cushioning material 2, 3 Plastic film (laminate)
2A, 3A High melting point plastic (outermost layer)
2B, 3B Low melting point plastic (innermost layer)
4 Vertical heat seal 5 Horizontal heat seal 6 Air chamber 7A, 7B Heat seal roller pair 8A, 8B Heat seal bar pair

Claims (4)

２枚のプラスチックフィルムの間に空気を封入しながら、縦方向および横方向にヒートシールを行なって得られる、多数の空気室が平面状に連結された構造の空気袋緩衝材において、プラスチックフィルムが少なくとも２層の積層材であり、最外層のプラスチックの融点が、最内層のプラスチックの融点よりも高いことを特徴とする空気袋緩衝材。 In an air bag cushioning material having a structure in which a number of air chambers are connected in a planar shape, obtained by performing heat sealing in the vertical direction and the horizontal direction while enclosing air between two plastic films, An air bag cushioning material, characterized in that it is a laminate of at least two layers, and the melting point of the outermost plastic layer is higher than the melting point of the innermost plastic layer. 最外層のプラスチックの融点と最内層のプラスチックの融点との差が、８０℃以上ある請求項１の空気袋緩衝材。 The air bag cushioning material according to claim 1, wherein the difference between the melting point of the outermost layer plastic and the innermost layer plastic is 80 ° C or higher. 積層材を形成するプラスチックフィルムが内外２層であって、内層が低密度ポリエチレン、外層がナイロンまたはエチレン−酢酸ビニルアルコール共重合体からなる請求項１の空気袋緩衝材。 The air bag cushioning material according to claim 1, wherein the plastic film forming the laminated material has two layers of inner and outer layers, the inner layer is made of low density polyethylene and the outer layer is made of nylon or an ethylene-vinyl acetate alcohol copolymer. 請求項１に記載した空気袋緩衝材を製造する方法において、少なくとも２層のプラスチックフィルムの積層材であって、一方の表面に位置するプラスチックの融点が他方の表面に位置するプラスチックの融点よりも高いものを２枚、融点の低いプラスチックフィルムを向かい合わせて重ね、一定の間隔で配置した多数のヒートシール用ローラーの対の間を走らせることにより、縦方向に複数の平行なヒートシール部を同時に形成し、それにわずか遅れて、２枚の積層材の間に空気を吹き込みつつ、一対のシールバーで所定の間隔を置いて挟むことにより、横方向に一定の間隔で平行に走る複数のヒートシール部を順次形成して、投影面がほぼ長方形の空気室を多数設けることを特徴とする空気袋緩衝材の製造方法。 The method for producing an air bag cushioning material according to claim 1, wherein the plastic film is a laminate of at least two plastic films, and the melting point of the plastic located on one surface is higher than the melting point of the plastic located on the other surface. By stacking two high ones and a plastic film with a low melting point facing each other and running between multiple pairs of heat sealing rollers arranged at regular intervals, a plurality of parallel heat seals are formed in the vertical direction. A plurality of heats that run in parallel at constant intervals in the horizontal direction by forming them at the same time and slightly intervening them while blowing air between the two laminated materials and sandwiching them at a predetermined interval with a pair of seal bars A method for manufacturing an air bag cushioning material, comprising: forming a plurality of air chambers each having a substantially rectangular projection surface by sequentially forming seal portions.
JP2007146329A 2007-05-31 2007-05-31 Plastic shock-absorbing air bag and manufacturing method of the same Pending JP2008296988A (en)

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