JPH0825543A - 積層発泡体 - Google Patents

積層発泡体

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Publication number
JPH0825543A
JPH0825543A JP6163614A JP16361494A JPH0825543A JP H0825543 A JPH0825543 A JP H0825543A JP 6163614 A JP6163614 A JP 6163614A JP 16361494 A JP16361494 A JP 16361494A JP H0825543 A JPH0825543 A JP H0825543A
Authority
JP
Japan
Prior art keywords
foam
laminated
thickness
heat
heat fusion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP6163614A
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English (en)
Inventor
Masayoshi Otsuki
政義 大槻
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sekisui Chemical Co Ltd
Original Assignee
Sekisui Chemical Co Ltd
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Filing date
Publication date
Application filed by Sekisui Chemical Co Ltd filed Critical Sekisui Chemical Co Ltd
Priority to JP6163614A priority Critical patent/JPH0825543A/ja
Publication of JPH0825543A publication Critical patent/JPH0825543A/ja
Pending legal-status Critical Current

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Classifications

    • 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
    • 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
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/1403—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the type of electromagnetic or particle radiation
    • B29C65/1412—Infrared [IR] radiation
    • B29C65/1422—Far-infrared radiation [FIR]
    • 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
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/1429—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface
    • B29C65/1432—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface direct heating of the surfaces 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
    • 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
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/1429—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface
    • B29C65/1454—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface scanning at least one of the parts to be joined
    • B29C65/1458—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface scanning at least one of the parts to be joined once, i.e. contour welding
    • 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
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/1429—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface
    • B29C65/1464—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface making use of several radiators
    • B29C65/1467—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface making use of several radiators at the same time, i.e. simultaneous welding
    • 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
    • B29C65/82—Testing the joint
    • B29C65/8253—Testing the joint by the use of waves or particle radiation, e.g. visual examination, scanning electron microscopy, or X-rays
    • 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
    • B29C66/45—Joining of substantially the whole surface of the articles
    • 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
    • B29C66/72—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
    • B29C66/727—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 porous, e.g. foam
    • 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
    • B29C66/73521—Thickness, e.g. very thin of different thickness, i.e. the thickness of one of the parts to be joined being different from the thickness 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
    • B29C66/739—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
    • B29C66/834—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
    • B29C66/80—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
    • B29C66/83415—Roller, cylinder or drum types the contact angle between said rollers, cylinders or drums and said parts to be joined being a non-zero angle
    • 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
    • B29C2793/00—Shaping techniques involving a cutting or machining operation
    • B29C2793/009—Shaping techniques involving a cutting or machining operation after shaping
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/919—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Laminated Bodies (AREA)

Abstract

(57)【要約】 【目的】 厚みの厚い積層発泡体を熱融着により積層し
て製造し、これを冷却しないまゝ切断しても断面が凹状
に窪むことがなく、断熱性や外観にすぐれた積層発泡体
を提供する。 【構成】 積層発泡体１は内層となるポリエチレン発泡
体（厚み１０ｍｍ、発泡倍率３０倍）２の両面に外層と
なる同質のポリエチレン発泡体３、３（厚み７．５ｍ
ｍ、発泡倍率３０倍）が熱融着により積層された厚み２
５ｍｍのものであり、その切断線１１は厚み方向に直線
状である。

Description

【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は、３層以上のポリオレフ
ィン系樹脂発泡体が熱融着により積層された積層発泡体
に関する。
【０００２】
【従来の技術】ポリオレフィン系樹脂特にポリエチレン
発泡体は断熱性、クッション性にすぐれ、加工性がよい
ので風呂用のすのこやマットとして広く使用されてい
る。このような風呂用すのこやマットは厚みの大きいも
のが用いられる。ところで、ポリエチレン発泡体は上記
のような厚みの大きいものとして押出し発泡成形するこ
とは困難であるため、例えば実公平４−３６７０９号公
報記載の風呂用マットもしくは、すのこのように、比較
的厚みの薄いシート状に成形したものを何枚か重ねて熱
融着することにより厚物とされる。
【０００３】上記熱融着による積層方法は、例えば厚み
５ｍｍのポリエチレン発泡体の場合、４層までは１工程
で熱融着積層は可能である。４層よりも厚い厚みが必要
な場合には、予め２〜３枚ずつ熱融着で積層しておいた
ものを更に何枚か熱融着により積層することにより得る
ことができる。このように熱融着により積層した厚物の
発泡体は、熱融着直後に所望の大きさ、形状に切断した
り打ち抜いたりして製品が得られる。
【０００４】
【発明が解決しようとする課題】上記のようにして３層
以上の積層体とした直後に所望の大きさや形状に切断も
しくは打ち抜かれる。それが冷却された後は、図４に示
すように断面が凹面となるような窪み１０が生ずる。
【０００５】この理由として以下のように考えられる。
３層以上のポリオレフィン系樹脂発泡体を熱融着で積層
する場合、内層となる発泡体面と外層となる発泡体面と
を遠赤外線ヒーター等により同時に、且つ均等に加熱
し、表面が加熱溶融した発泡体同士を圧着すると接着積
層される。しかし、内層の発泡体は熱融着接着されたと
き両面から熱融着のための熱を受け、外層の発泡体より
も受熱量が大である。積層後、外層は容易に放熱する
が、内層は容易に放熱されず蓄熱する。
【０００６】即ち、熱融着積層時において内層は外層よ
りも高温となり、断熱性を有するため内層の温度は容易
に下がらない。この温度状態のままで積層体を積層面に
垂直に裁断し、この積層体が常温まで冷却するとき、熱
融着積層時の温度と常温との温度差は内層の方が大であ
る。このため、平面方向における発泡体の収縮量は外層
よりも内層の方が大となり、断面が凹状に窪んだ形状と
なる。従って、積層体の厚みが大となるほど、又、切断
時の内層の温度が高いほどこの傾向が顕著となる。
【０００７】本発明は上記従来の問題点を解消し、厚み
の厚い積層発泡体を熱融着により積層して製造し、これ
を切断しても断面が凹状に窪むことがなく、断熱性や外
観にすぐれた積層発泡体を提供することを目的とする。
【０００８】
【課題を解決するための手段】本発明積層発泡体は、内
層及びその両面で外層となるポリオレフィン系樹脂発泡
体が互いに熱融着により積層されてなる３層以上の積層
発泡体において、内層を構成する発泡体の樹脂量がいず
れの外層を構成する発泡体の樹脂量よりも大であること
を特徴とするものである。
【０００９】本発明で発泡体として使用するポリオレフ
ィン系樹脂は、ポリエチレン、ポリプロピレン、エチレ
ン−酢酸ビニル共重合体等、又、これら２種以上の混合
物からなるもので、必要に応じて顔料等の充填剤が混合
されてもよい。発泡倍率が５倍よりも低いとクッション
性、柔軟性が乏しく、５０倍を超えると柔らかすぎて強
度が低くなり実用性を損じるので、発泡倍率が５〜５０
倍のものが好ましい。発泡体は単一の層からなるもので
あってもよく、予め何枚か積層されたものであってもよ
い。
【００１０】本発明における内層とその両面で外層とな
る発泡体は発泡倍率、厚みを上記の範囲から選択して組
み合わせる。即ち、内層となる発泡体として、各外層と
なる発泡体よりも樹脂量つまり単位面積あたりの重量が
大きくなるように発泡倍率もしくは厚み、又はその両方
を選択すればよい。本発明で使用する発泡体の樹脂は架
橋されているものであっても、又、架橋されていないも
のであってもよい。
【００１１】上記のようにして積層された積層発泡体の
内層の発泡体は両面から熱を受けるが、この両面に積層
された外層の発泡体よりも樹脂量が多いので加熱収縮率
が低く、冷却後においても切断した断面が凹状に窪む変
形が生じない。
【００１２】
【作用】本発明積層発泡体は、内層となる発泡体に収縮
が生じないので、窪みのない断面を有するものであり、
断熱性や外観にすぐれたものである。
【００１３】
【実施例】次に本発明の実施例を図面を参照して説明す
る。 （実施例１）図１は本発明積層発泡体の実施例を示す断
面図であり、積層発泡体１は内層となるポリエチレン発
泡体（厚み１０ｍｍ、発泡倍率３０倍）２の両面に外層
となる同質のポリエチレン発泡体３、３（厚み７．５ｍ
ｍ、発泡倍率３０倍）が熱融着により積層された厚み２
５ｍｍのものであり、その切断線１１は厚み方向に直線
状である。
【００１４】ポリエチレン発泡体３、３は図２に示すよ
うに、予め、厚み４ｍｍのポリエチレン発泡体３１と
３．５ｍｍの同質のポリエチレン発泡体３２とが向き合
う面同士をヒーター４により加熱溶融して圧着ロール
５、５により圧着して積層されたものである。又、ポリ
エチレン発泡体２も同様にして厚み５ｍｍの２枚のポリ
エチレン発泡体２１、２１が予め熱融着により積層され
たものである。
【００１５】上記積層発泡体１の製造方法を図３により
説明する。ロール状に巻かれた発泡体３、３の間に、こ
れもロール状に巻かれた発泡体２を配置し、各々の発泡
体３、２、３を熱融着装置へ供給し、中央の発泡体２の
両面及び発泡体３、３の発泡体２側の面を遠赤外線ヒー
ター６、６により加熱溶融し、これらをラミネートロー
ル７、７により圧着することにより積層した。ラミネー
ト直後の積層発泡体１の表面温度は７０〜１００℃であ
った。これを引取りロール８、８通過後に幅方向の両端
部をスリッター９１で切り落とし、次にカッター９によ
り所定の長さに裁断した。上記発泡体２の樹脂量は０．
３３ｇ／ｍ2 であり、発泡体３の樹脂量は０．２５ｇ／
ｍ2 であった。
【００１６】積層発泡体１が冷却した後、裁断した切断
面を観察したところ、発泡体２の窪みは０．３ｍｍ以下
であり目視によっては認められないものであった。
【００１７】（実施例２）発泡体２の厚みを１０ｍｍと
し、発泡体３の厚みを９ｍｍとした以外は実施例１と同
様にしてこれらを熱融着して積層発泡体を得た。発泡体
２の樹脂量は０．３３ｇ／ｍ2 であり、発泡体３の樹脂
量は０．３０ｇ／ｍ2 であった。積層発泡体１が冷却し
た後、裁断した切断面を観察したところ、発泡体２の窪
みは０．３ｍｍ以下であり目視によっては殆ど認められ
なかった。
【００１８】（実施例３）発泡体２の発泡倍率を２５倍
とし、発泡体３の厚みを１０ｍｍとした以外は実施例１
と同様にしてこれらを熱融着して積層発泡体を得た。発
泡体２の樹脂量は０．４０ｇ／ｍ2 であり、発泡体３の
樹脂は０．３３であった。積層発泡体１が冷却した後、
裁断した切断面を観察したところ、発泡体２の窪みは
０．３ｍｍ以下であり目視によっては殆ど認められなか
った。
【００１９】（実施例４）発泡体２の発泡倍率を２８倍
とした以外は実施例３と同様にしてこれらを熱融着して
積層発泡体を得た。発泡体２の樹脂量は０．３５ｇ／ｍ
2 であり、発泡体３の樹脂量は０．３３ｇ／ｍ2 であっ
た。積層発泡体１が冷却した後、裁断した切断面を観察
したところ、発泡体２の窪みは０．３ｍｍ以下であり目
視によっては殆ど認められなかった。
【００２０】（比較例）発泡体２の厚みを５ｍｍとし、
発泡体３は厚み５ｍｍの２枚の発泡体原反を予め熱融着
で積層した厚み１０ｍｍのものを用いた以外は実施例１
と同様にして積層発泡体とした。発泡体２の樹脂量は
０．１６５ｇ／ｍ2 であり、発泡体３の樹脂量は０．３
３ｇ／ｍ2 であった。このものは冷却した後に裁断した
ところ、切断面の発泡体２の部分で約１ｍｍの窪みを生
じており、目視ではっきりと認められ、外観が悪くかっ
た。
【００２１】
【発明の効果】本発明積層発泡体は以上の構成であり、
熱融着による積層後、直ちに裁断しても内層となる発泡
体に収縮が生じないので、断面に凹状の窪みがなく、敷
き並べたときに断熱性が損なわれず、又、外観にすぐれ
た厚みの大きいものである。
【００２２】
【図面の簡単な説明】
【図１】本発明積層発泡体の実施例を示す断面図。
【図２】実施例１で用いる発泡体の製造方法を示す説明
図。
【図３】本発明積層発泡体の製造方法の実施例を示す説
明図。
【図４】従来の積層体を示す断面図。
【符号の説明】
１ ：積層発泡体 ２，３，２１，３１，３２：ポリエチレン発泡体 ５ ：圧着ロール ６ ：赤外線ヒーター ７ ：ラミネートロール ９ ：カッター １１：切断線

Claims (1)

    【特許請求の範囲】
  1. 【請求項１】 内層及びその両面で外層となるポリオレ
    フィン系樹脂発泡体が互いに熱融着により積層されてな
    る３層以上の積層発泡体において、内層を構成する発泡
    体の樹脂量がいずれの外層を構成する発泡体の樹脂量よ
    りも大であることを特徴とする積層発泡体。
JP6163614A 1994-07-15 1994-07-15 積層発泡体 Pending JPH0825543A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6163614A JPH0825543A (ja) 1994-07-15 1994-07-15 積層発泡体

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6163614A JPH0825543A (ja) 1994-07-15 1994-07-15 積層発泡体

Publications (1)

Publication Number Publication Date
JPH0825543A true JPH0825543A (ja) 1996-01-30

Family

ID=15777279

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6163614A Pending JPH0825543A (ja) 1994-07-15 1994-07-15 積層発泡体

Country Status (1)

Country Link
JP (1) JPH0825543A (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001076743A (ja) * 1999-07-02 2001-03-23 Toyota Motor Corp 薄膜積層装置
KR20210129612A (ko) 2020-04-20 2021-10-28 시부야 패키징 시스템 가부시키가이샤 포장체 제조 장치

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001076743A (ja) * 1999-07-02 2001-03-23 Toyota Motor Corp 薄膜積層装置
KR20210129612A (ko) 2020-04-20 2021-10-28 시부야 패키징 시스템 가부시키가이샤 포장체 제조 장치

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