JPH11105132A - Production of thermally molded laminated sheet - Google Patents

Production of thermally molded laminated sheet

Info

Publication number
JPH11105132A
JPH11105132A JP9291572A JP29157297A JPH11105132A JP H11105132 A JPH11105132 A JP H11105132A JP 9291572 A JP9291572 A JP 9291572A JP 29157297 A JP29157297 A JP 29157297A JP H11105132 A JPH11105132 A JP H11105132A
Authority
JP
Japan
Prior art keywords
foamed
sheet
raw material
layer
film layer
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.)
Granted
Application number
JP9291572A
Other languages
Japanese (ja)
Other versions
JP3797639B2 (en
Inventor
Yoshiaki Momose
義昭 百瀬
Toru Kino
徹 木野
Takashi Muroi
崇 室井
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.)
JSP Corp
Original Assignee
JSP Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by JSP Corp filed Critical JSP Corp
Priority to JP29157297A priority Critical patent/JP3797639B2/en
Publication of JPH11105132A publication Critical patent/JPH11105132A/en
Application granted granted Critical
Publication of JP3797639B2 publication Critical patent/JP3797639B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To constitute the stopper provided on the lower plate of a fixing part of a height variable stopper capable of being freely changed in its total height dimension, to freely alter the contact positional relation with a cut ring and a counter plate at a time of driving and to achieve the certain positioning of the falling point of an air blowing-in nozzle, the good cutting of burr, the elimination of whiskers, the enhancement of the life of the counter plate and the cut plate and the shortening of an adjusting work time. SOLUTION: When a laminated sheet is obtained by laminating polypropylene resin foam sheet layers on both surfaces of a polypropylene resin foam sheet layer with a density of 0.5-0.1 g/cm and a thickness of 0.5-0.5 mm by a coextrusion inflation method, an inorg. filler is added to a raw material for the film layer on the contact side with a columnar cooling drum of a cylindrical laminate extruded from an extruder.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、容器やトレー等の
熱成形品を成形するために用いる熱成形用積層シートの
製造方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a thermoformed laminated sheet used for molding thermoformed products such as containers and trays.

【0002】[0002]

【従来の技術】合成樹脂発泡シートと合成樹脂フィルム
とを積層した積層シートを製造する方法として、別々の
工程で製造した合成樹脂発泡シートと合成樹脂フィルム
とを、それぞれロール状に巻いてから積層工程に移送
し、当該工程において合成樹脂発泡シートと合成樹脂フ
ィルムとをロールから展開しながら積層する方法(オフ
ラインラミネート法)や、合成樹脂発泡シート製造ライ
ンで製造された発泡シートに、合成樹脂フィルム製造ラ
インで製造された合成樹脂フィルムを直ちに積層する方
法(オンラインラミネート法)が知られている。しかし
ながら、オフラインラミネート法は別々の工程で製造し
た合成樹脂発泡シートと合成樹脂フィルムとを、積層工
程に移送して積層する方法であるため、一旦製造した発
泡シートやフィルムを一時的に保管したり、積層工程に
移送するための手間がかかるとともに、保管場所の確保
が必要であり、積層シートの製造効率も低く、製造コス
トが高くつくという問題があった。一方、オンラインラ
ミネート法は発泡シートやフィルムの製造工程と、これ
らの積層工程とを連続して行うことができるため、オフ
ラインラミネート法よりも積層シートの製造効率が高い
利点がある。しかしながらオンラインラミネート法で
は、発泡シート製造用の押出機から押出された発泡シー
トと、フィルム製造用の押出機から押出されたフィルム
とを重ね合わせてラミネートロール間を通過させて積層
する方法であるため、発泡シート製造用のダイスと、フ
ィルム製造用のダイスとがそれぞれ必要であるととも
に、製造ラインの長さも長くなり、特に発泡シートの両
面にフィルムを積層する場合には更に長い製造ラインを
必要とするため、設備コストが高くつくという問題があ
った。
2. Description of the Related Art As a method for producing a laminated sheet in which a synthetic resin foam sheet and a synthetic resin film are laminated, a synthetic resin foam sheet and a synthetic resin film produced in separate steps are wound into rolls and then laminated. Transfer to a process, and in this process, a synthetic resin foam sheet and a synthetic resin film are laminated while being rolled out from a roll (off-line lamination method), or a synthetic resin film is added to a foam sheet manufactured on a synthetic resin foam sheet production line. 2. Description of the Related Art A method of immediately laminating a synthetic resin film produced on a production line (on-line laminating method) is known. However, the offline laminating method is a method in which a synthetic resin foam sheet and a synthetic resin film manufactured in separate steps are transferred to a laminating step and laminated, so that the foam sheet or film once manufactured is temporarily stored. In addition, there is a problem that it takes time and effort to transfer the sheet to the laminating step, and it is necessary to secure a storage place, the production efficiency of the laminated sheet is low, and the production cost is high. On the other hand, the on-line laminating method has an advantage that the production efficiency of the laminated sheet is higher than that of the off-line laminating method because the production process of the foamed sheet or film and the lamination process thereof can be performed continuously. However, in the online laminating method, a foamed sheet extruded from an extruder for producing a foamed sheet and a film extruded from an extruder for producing a film are overlapped and passed between laminating rolls for lamination. In addition to the need for a foam sheet-manufacturing die and a film-manufacturing die, the length of the manufacturing line also becomes longer, especially when laminating films on both sides of the foam sheet, a longer manufacturing line is required. Therefore, there is a problem that equipment costs are high.

【0003】一方、合成樹脂発泡シート用原料と合成樹
脂フィルム用原料とを、それぞれ押出機に供給し、環状
ダイス内で両原料を合流させた後、環状ダイスから押出
して発泡シート用原料を発泡させ、発泡シート層とフィ
ルム層とが積層一体化した積層シートを得る方法(以
下、共押出インフレーション法と呼ぶ。)も種々提案さ
れており(例えば特開昭61−130025号、特開平
5−208442号、特公昭48−37752号、特公
平5−2502号)、共押出インフレーション法によれ
ばオフラインラミネート法やオンラインラミネート法の
上記した欠点を解決することができる。
On the other hand, a raw material for a synthetic resin foam sheet and a raw material for a synthetic resin film are respectively supplied to an extruder, and the raw materials for the foamed sheet are extruded from the circular die after joining the raw materials in an annular die. Various methods have been proposed for obtaining a laminated sheet in which a foamed sheet layer and a film layer are laminated and integrated (hereinafter, referred to as a co-extrusion inflation method) (for example, JP-A-61-130025, JP-A-5-132005). 208442, JP-B-48-37752, JP-B-5-2502), and the above-mentioned disadvantages of the offline lamination method and the online lamination method can be solved by the co-extrusion inflation method.

【0004】[0004]

【発明が解決しようとする課題】ところで、上記のよう
に積層シートを、容器やトレー等の熱成形用として用い
る場合、発泡シートの両面にフィルムが積層されている
と、発泡シート内のガスが抜け難く、熱成形時の発泡シ
ートの二次発泡倍率が高くなるため好ましい。即ち、熱
成形時に積層シートは引き伸ばされて、シートの厚みが
薄くなる傾向にあり、特に深絞り成形を行う場合にはこ
の傾向は顕著となって、極端な場合には成形品に穴が開
いたりする虞れがあるが、発泡シートの二次発泡性が高
いと熱成形時のシートの厚み減少を少なくするこができ
る。また熱成形用積層シートとしては、上記と同様の理
由で発泡シート層の厚みが0.5〜5.0mm程度のも
のが好適に用いられる。上記共押出インフレーション法
によって環状ダイスから筒状に押出して発泡シート用原
料を発泡させるとともに発泡シート層とフィルム層とを
積層一体化して得られた筒状積層体は、通常、外気によ
って冷却された後、シート状に切り開かれるが、熱成形
用積層シートの場合、上記したように発泡シート層の厚
みが0.5〜3.0mm程度必要であるために、筒状積
層体の内面側の冷却が不十分となり易い。このため共押
出インフレーション法によって熱成形用積層シートを製
造する場合には、筒状積層体の内面側を円柱状冷却ドラ
ムに接触させて冷却することが望ましい。しかしなが
ら、発泡シートの両面にフィルムを積層した積層シート
を製造する場合、筒状積層体内面側のフィルム層が円柱
状冷却ドラム表面に粘着して、安定した製造が行い難く
なるとともに、得られた積層シートの円柱状冷却ドラム
と接触した側の面の表面が凹凸となって外観が低下する
という問題があった。
When the laminated sheet is used for thermoforming a container or a tray as described above, if a film is laminated on both sides of the foamed sheet, the gas in the foamed sheet is reduced. It is preferable because it hardly comes off and the secondary expansion ratio of the foamed sheet during thermoforming becomes high. That is, the laminated sheet tends to be stretched at the time of thermoforming, and the thickness of the sheet tends to be reduced. This tendency becomes remarkable especially when deep drawing is performed, and in an extreme case, a hole is formed in the molded product. However, if the secondary foaming property of the foamed sheet is high, a decrease in the thickness of the sheet during thermoforming can be reduced. As the thermoforming laminate sheet, a foam sheet layer having a thickness of about 0.5 to 5.0 mm is preferably used for the same reason as described above. A tubular laminate obtained by extruding the raw material for a foamed sheet by extruding into a tubular shape from an annular die by the co-extrusion inflation method and laminating and integrating a foamed sheet layer and a film layer was usually cooled by outside air. Thereafter, the sheet is cut open in the form of a sheet. In the case of a laminated sheet for thermoforming, since the thickness of the foamed sheet layer is required to be about 0.5 to 3.0 mm as described above, cooling of the inner surface side of the cylindrical laminated body is performed. Tends to be insufficient. Therefore, when producing a laminated sheet for thermoforming by the co-extrusion inflation method, it is desirable that the inner surface side of the cylindrical laminated body is brought into contact with a cylindrical cooling drum for cooling. However, when manufacturing a laminated sheet in which a film is laminated on both sides of a foamed sheet, the film layer on the inner surface side of the cylindrical laminate adheres to the surface of the cylindrical cooling drum, and it is difficult to perform stable production, and the obtained result is obtained. There has been a problem that the surface of the side of the laminated sheet in contact with the cylindrical cooling drum becomes uneven, and the appearance is deteriorated.

【0005】本発明は、上記の従来技術の欠点を解決す
べくなされたもので、共押出しによるインフレーション
法において、ポリプロピレン系樹脂発泡層の両面にポリ
プロピレン系樹脂無発泡層が積層された積層シートを得
るに際し、共押出された筒状積層体と円柱状冷却ドラム
表面との滑り性に優れ、外観良好な積層シートを安定し
て製造することができる方法を提供することを目的とす
るものである。本発明者らは、上記課題を解決すべく研
究した結果、円柱状冷却ドラムと接する側のフィルム層
を形成する原料中に、10重量%以上の無機フィラーを
含有させることにより、これらの問題点を解決しうるこ
とを見出し、本発明を完成するに至った。
The present invention has been made to solve the above-mentioned drawbacks of the prior art. In an inflation method by co-extrusion, a laminated sheet in which a polypropylene resin non-foamed layer is laminated on both sides of a polypropylene resin foamed layer is formed. It is an object of the present invention to provide a method capable of stably producing a laminated sheet having a good appearance with excellent slipperiness between a coextruded cylindrical laminate and the surface of a cylindrical cooling drum upon obtaining. . The present inventors have studied to solve the above problems, and as a result, by adding 10% by weight or more of an inorganic filler to a raw material for forming a film layer in contact with a cylindrical cooling drum, these problems were solved. Was found to be able to be solved, and the present invention was completed.

【0006】[0006]

【課題を解決するための手段】すなわち、本発明の熱成
形用積層シートの製造方法は、〔1〕ポリプロピレン系
樹脂発泡シート層を形成する原料とポリプロピレン系樹
脂無発泡フィルム層を形成する原料とをそれぞれ押出機
に供給し、これらをダイス内部で合流した後環状ダイス
より押出して、発泡シート層を形成する原料を発泡さ
せ、発泡シート層の両面に無発泡フィルム層を積層した
筒状の積層体を形成し、次いで筒状積層体の内面側を円
柱状冷却ドラム周面に接触させて引取りながら冷却し、
切り開いてシート状とし、密度が0.5乃至0.1g/
cm3 及び厚みが0.5〜5.0mmのポリプロピレン
系樹脂発泡シート層の両面にポリプロピレン系樹脂無発
泡フィルム層が積層して一体化された熱成形用積層シー
トの製造方法において、少なくとも円柱状冷却ドラムと
接する側のポリプロピレン系樹脂無発泡フィルム層を形
成する原料中に10重量%以上の無機フィラーが含有さ
れていることを特徴とする熱成形用積層シートの製造方
法、〔2〕円柱状冷却ドラムと接する側のポリプロピレ
ン系樹脂無発泡フィルム層を形成する原料中に15重量
%以上の無機フィラーが含有されていることを特徴とす
る上記〔1〕記載の熱成形用積層シートの製造方法、
〔3〕筒状積層体の外側に位置するポリプロピレン系樹
脂無発泡フィルム層を形成する原料中に、10重量%以
上の無機フィラーが含有されていることを特徴とする上
記〔1〕または〔2〕記載の熱成形用積層シートの製造
方法、〔4〕無機フィラーを含有するポリプロピレン系
樹脂無発泡フィルム層を形成する原料中に、下記式
(1)にて示される範囲の量の無機フィラーを含有する
上記〔1〕〜〔3〕のいずれか記載の熱成形用積層シー
トの製造方法を要旨とする。
That is, the method of manufacturing a laminated sheet for thermoforming of the present invention comprises: [1] a raw material for forming a foamed polypropylene resin sheet layer and a raw material for forming a non-foamed polypropylene resin film layer; Are fed into an extruder, and they are merged inside a die, and then extruded from an annular die to foam a raw material forming a foamed sheet layer, and a non-foamed film layer is laminated on both sides of the foamed sheet layer. Forming a body, and then cooling while taking the inner surface side of the cylindrical laminated body into contact with the cylindrical cooling drum peripheral surface,
Cut into sheets to obtain a density of 0.5 to 0.1 g /
In a method for producing a laminated sheet for thermoforming in which a polypropylene-based resin non-foamed film layer is laminated and integrated on both sides of a polypropylene-based resin foamed sheet layer having a cm 3 and a thickness of 0.5 to 5.0 mm, at least a columnar shape is obtained. A method for producing a laminated sheet for thermoforming, characterized in that the raw material for forming the polypropylene resin non-foamed film layer on the side in contact with the cooling drum contains 10% by weight or more of an inorganic filler, [2] cylindrical shape The method for producing a laminated sheet for thermoforming according to the above [1], wherein the raw material for forming the polypropylene resin non-foamed film layer on the side in contact with the cooling drum contains 15% by weight or more of an inorganic filler. ,
[3] The raw material for forming the polypropylene resin non-foamed film layer located outside the cylindrical laminate contains 10% by weight or more of an inorganic filler in the above-mentioned [1] or [2]. ] The method for producing a laminated sheet for thermoforming according to [4], wherein in the raw material for forming the non-foamed polypropylene resin film layer containing an inorganic filler, an inorganic filler in an amount represented by the following formula (1) is used: The gist is a method for producing a laminated sheet for thermoforming according to any one of the above [1] to [3].

【数2】 10≦f (X) ≦−277X2 +244X−3.09 ・・・(1) 但し、f(X) :無機フィラーの含有量〔重量%〕 X :発泡シート層の密度〔g/cm3 10 ≦ f (X) ≦ −277X 2 + 244X−3.09 (1) where f (X): content of inorganic filler [% by weight] X: density of foamed sheet layer [g] / Cm 3 ]

【0007】[0007]

【発明の実施の形態】本発明において、ポリプロピレン
系樹脂発泡シート層(以下「発泡シート層」という。)
を形成する原料(以下「発泡シート層用原料」とい
う。)とポリプロピレン系樹脂無発泡フィルム層(以下
「無発泡フィルム層」という。)を形成する原料(以下
「無発泡フィルム層用原料」という。)に用いるポリプ
ロピレン系樹脂としては、いずれもプロピレンホモポリ
マーやプロピレンと他のオレフィン系モノマーとの共重
合体が用いられる。共重合体としては、ブロック共重合
体、ランダム共重合体のいずれも用いることができる。
更に二元系または三元系共重合体であっても良い。
DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, a polypropylene resin foam sheet layer (hereinafter referred to as "foam sheet layer").
(Hereinafter referred to as "raw material for foamed sheet layer") and a raw material for forming polypropylene resin non-foamed film layer (hereinafter referred to as "non-foamed film layer") (hereinafter referred to as "raw material for non-foamed film layer"). ), A propylene homopolymer or a copolymer of propylene with another olefin monomer is used. As the copolymer, any of a block copolymer and a random copolymer can be used.
Further, a binary or ternary copolymer may be used.

【0008】プロピレンと他のオレフィン系モノマーと
の共重合体をポリプロピレン系樹脂原料として用いる場
合、他のオレフィン系モノマーは共重合体中に、ランダ
ム共重合体の場合には5.0重量%以下、ブロック共重
合体の場合には20.0重量%以下の割合で用いるのが
好ましい。共重合体中の他のオレフィン系モノマーがこ
れより多いと、ポリプロピレン本来の透明性、剛性、表
面光沢、耐熱性等の特性が損なわれてしまうため好まし
くない。
When a copolymer of propylene and another olefin monomer is used as a raw material for a polypropylene resin, the other olefin monomer is contained in the copolymer, and in the case of a random copolymer, it is not more than 5.0% by weight. In the case of a block copolymer, it is preferably used in a proportion of 20.0% by weight or less. If the amount of other olefinic monomers in the copolymer is larger than this, the inherent properties of polypropylene such as transparency, rigidity, surface gloss and heat resistance are impaired, which is not preferable.

【0009】プロピレンと共重合可能な他のオレフィン
系モノマーとしては、エチレン、1−ブテン、イソブチ
レン、1−ペンテン、3−メチル−1−ヘキセン、3,
4−ジメチル−1−ブテン、1−ヘプテン、3−メチル
−1−ヘキセン等が挙げられる。上記ポリプロピレン系
樹脂のなかでも、耐熱性、低温での耐衝撃性に優れたプ
ロピレン─エチレンブロック共重合体が特に好ましい。
Other olefin monomers copolymerizable with propylene include ethylene, 1-butene, isobutylene, 1-pentene, 3-methyl-1-hexene,
4-dimethyl-1-butene, 1-heptene, 3-methyl-1-hexene and the like. Among the above polypropylene resins, a propylene / ethylene block copolymer having excellent heat resistance and impact resistance at low temperatures is particularly preferred.

【0010】上記ポリプロピレン系樹脂原料は、単独で
用いるのみならず、2種以上を混合して用いることもで
きる。更に、ポリプロピレン系樹脂原料には、前記した
ようにポリプロピレン本来の特性が損なわれない範囲
で、高密度ポリエチレン、低密度ポリエチレン、直鎖状
低密度ポリエチレン、直鎖状超低密度ポリエチレン、エ
チレン−ブテン共重合体、エチレン−無水マレイン酸共
重合体等のエチレン系樹脂、ブテン系樹脂、ポリ塩化ビ
ニル、塩化ビニル−酢酸ビニル共重合体等の塩化ビニル
系樹脂、スチレン系樹脂等を加えることもできる。無発
泡フィルム層用原料と発泡シート層用原料は同一であっ
ても、異なっていてもよい。また内外の無発泡フィルム
層用原料も同一であっても、相互に異なっていてもよ
い。
The above-mentioned polypropylene resin raw materials can be used alone or in combination of two or more. Further, as described above, polypropylene resin raw materials include high-density polyethylene, low-density polyethylene, linear low-density polyethylene, linear ultra-low-density polyethylene, ethylene-butene as long as the inherent properties of polypropylene are not impaired as described above. Copolymers, ethylene resins such as ethylene-maleic anhydride copolymers, butene resins, polyvinyl chloride, vinyl chloride resins such as vinyl chloride-vinyl acetate copolymers, and styrene resins can also be added. . The raw material for the non-foamed film layer and the raw material for the foamed sheet layer may be the same or different. Also, the raw materials for the inner and outer non-foamed film layers may be the same or different from each other.

【0011】押出機に供給するポリプロピレン系樹脂原
料としては、通常、粒子状に成形されたものを用いる
が、その具体的な形状は特に限定されない。球状、円柱
状、楕円球状、不定形状等の任意の形状の樹脂粒子を使
用することができる。
As the raw material of the polypropylene resin to be supplied to the extruder, usually, a raw material molded into particles is used, but the specific shape is not particularly limited. Resin particles having an arbitrary shape such as a spherical shape, a columnar shape, an elliptical spherical shape, and an irregular shape can be used.

【0012】発泡シート層用原料と無発泡フィルム層用
原料とをそれぞれ押出機に供給し、発泡シート層の両面
に無発泡フィルム層が一体化するように、環状ダイス内
部で両原料を合流し積層させた後、環状ダイスより筒状
に共押出し発泡シート層用原料を発泡させ、発泡シート
層の内外面に無発泡フィルム層を有する筒状の積層体を
得るが、その際に発泡シート層の密度が0.5〜0.1
g/cm3 で厚みが0.5〜5.0mmとなるように発
泡を行う。発泡シート層の密度や厚みは、発泡剤の添加
量、押出温度、単位時間当りの押出量、積層シートの引
き取り速度等によって調整することができる。次いで筒
状の積層体内面側を円筒状冷却ドラムに接触させながら
引き取り、冷却した後、切り開いて積層シートとする
が、本発明では、筒状積層体の少なくとも円柱状冷却ド
ラムと接する側の無発泡フィルム層用原料中に、10重
量%以上の無機フィラーが含有されていることが必要で
ある。無機フィラーはさらに15重量%以上含有されて
いるのが好ましい。無発泡フィルム層用原料中の無機フ
ィラー含有量が10重量%に満たないと、筒状積層体の
内表面が円柱状冷却ドラム表面にべたついてしまうので
筒状積層体が円柱状冷却ドラム上を通過する際にスムー
スな移送が行われず、筒状積層体の円柱状冷却ドラム側
の表面には許容できないひどい凹凸が形成されてしまう
結果となる。また、無機フィラーの上記含有量を15重
量%以上にした場合には、筒状積層体が円柱状冷却ドラ
ム上を通過する際によりスムースな移送が行われうるの
で、筒状積層体の円柱状冷却ドラム側の表面が非常に平
滑となる。さらによりスムースな移送が可能になる結
果、筒状積層体の円柱状冷却ドラム上を通過するスピー
ドを速くしても良好な表面状態の熱成形用積層シートが
製造できるので、単位時間当りの押出量を向上させるこ
とができる。
A raw material for a foamed sheet layer and a raw material for a non-foamed film layer are supplied to an extruder, and the raw materials are joined in an annular die so that the non-foamed film layer is integrated on both sides of the foamed sheet layer. After the lamination, the raw material for the foamed sheet layer is co-extruded into a tubular shape from an annular die to foam the raw material for a foamed sheet layer, and a tubular laminate having a non-foamed film layer on the inner and outer surfaces of the foamed sheet layer is obtained. Density of 0.5 to 0.1
Foaming is performed so that the thickness becomes 0.5 to 5.0 mm at g / cm 3 . The density and thickness of the foamed sheet layer can be adjusted by the addition amount of the foaming agent, the extrusion temperature, the extrusion amount per unit time, the take-up speed of the laminated sheet, and the like. Then, the inner surface side of the cylindrical laminated body is taken out while being brought into contact with the cylindrical cooling drum, cooled and then cut out to form a laminated sheet. However, in the present invention, at least the side of the cylindrical laminated body which is in contact with the cylindrical cooling drum is removed. It is necessary that the raw material for the foamed film layer contains 10% by weight or more of an inorganic filler. It is preferable that the inorganic filler is further contained in an amount of 15% by weight or more. If the content of the inorganic filler in the raw material for the non-foamed film layer is less than 10% by weight, the inner surface of the cylindrical laminate sticks to the surface of the cylindrical cooling drum. When passing, smooth transfer is not performed, and as a result, unacceptable severe irregularities are formed on the surface of the cylindrical laminated body on the side of the cylindrical cooling drum. In addition, when the content of the inorganic filler is set to 15% by weight or more, smooth transfer can be performed when the cylindrical laminated body passes over the cylindrical cooling drum. The surface on the cooling drum side becomes very smooth. As a result of smoother transfer, even if the speed of passage of the cylindrical laminate over the cylindrical cooling drum can be increased, it is possible to produce a laminated sheet for thermoforming having a good surface state, so that extrusion per unit time can be performed. The amount can be improved.

【0013】さらに本発明において、無機フィラーは円
柱状冷却ドラム側と接触する側の無発泡フィルム層用原
料に加えるのみならず、外側のポリプロピレン系樹脂無
発泡フィルム層を形成する原料中にも加えることができ
る。外側の無発泡フィルム層用原料中への無機フィラー
の添加量は、10重量%以上、好ましくは15重量%以
上である。外側の無発泡フィルム層用原料に無機フィラ
ーを加えた場合には、熱成形用積層シート、ひいてはそ
の積層シートから得られる熱成形品の耐熱性及び剛性が
いっそう高まるという効果が得られる。
Further, in the present invention, the inorganic filler is added not only to the raw material for the non-foamed film layer on the side in contact with the cylindrical cooling drum side but also to the raw material for forming the outer polypropylene resin non-foamed film layer. be able to. The amount of the inorganic filler added to the outer raw material for the non-foamed film layer is 10% by weight or more, preferably 15% by weight or more. When the inorganic filler is added to the outer raw material for the non-foamed film layer, an effect is obtained that the heat resistance and rigidity of the thermoformed laminated sheet, and furthermore, the thermoformed product obtained from the laminated sheet are further increased.

【0014】本発明において、内側の無発泡フィルム層
用原料中の無機フィラー含有量は、上記したように10
重量%以上であることが必要であり、特に15重量%以
上であることが好ましいが、無機フィラーの添加量が多
すぎると発泡シート層と無発泡フィルム層とが剥離し易
くなる傾向になる。本発明者等の研究によると発泡シー
ト層と無発泡フィルム層との剥離が生じないような無機
フィラーの添加量と、発泡シート層の密度との間に特定
の関係が成り立つことが判明した。即ち、下記(1)式
で示す関係が成り立つ範囲内で無機フィラーを添加する
ことにより、発泡シート層と無発泡フィルム層とが強固
に積層一体化され、外観良好な積層シートを確実且つ容
易に得ることができる。
In the present invention, the content of the inorganic filler in the material for the inner non-foamed film layer is 10 as described above.
It is necessary that the amount is not less than 15% by weight, and particularly preferably not less than 15% by weight. However, if the amount of the inorganic filler is too large, the foamed sheet layer and the non-foamed film layer tend to be easily separated. According to the study by the present inventors, it has been found that a specific relationship is established between the amount of the inorganic filler added so that the foamed sheet layer and the non-foamed film layer do not peel off and the density of the foamed sheet layer. That is, by adding an inorganic filler within a range where the relationship represented by the following formula (1) is satisfied, the foamed sheet layer and the non-foamed film layer are firmly laminated and integrated, and a laminated sheet having a good appearance can be reliably and easily obtained. Obtainable.

【0015】[0015]

【数3】 10≦f (X) ≦−277X2 +244X−3.09 ・・・(1) 但し、f(X) :無機フィラーの含有量〔重量%〕 X :発泡シート層の密度〔g/cm3 10 ≦ f (X) ≦ −277X 2 + 244X−3.09 (1) where f (X): content of inorganic filler [% by weight] X: density of foam sheet layer [g] / Cm 3 ]

【0016】図1は、上記(1)式で示す関係をグラフ
に示すものであり、下記(2)式で示す曲線が、図1に
おける曲線Aである。曲線Aよりも上側は発泡シート層
と無発泡フィルム層との剥離が生じ易くなる範囲を示
し、曲線Aよりも下側は外観良好な積層シートが容易に
得られる範囲を示す。
FIG. 1 is a graph showing the relationship represented by the above equation (1), and the curve represented by the following equation (2) is the curve A in FIG. The upper side of the curve A indicates a range in which peeling of the foamed sheet layer and the non-foamed film layer easily occurs, and the lower side of the curve A indicates a range in which a laminated sheet having good appearance can be easily obtained.

【0017】[0017]

【数4】 f (X) =−277X2 +244X−3.09 ・・・(2)F (X) = − 277X 2 + 244X−3.09 (2)

【0018】ここに用いる無機フィラーには、タルク、
シリカ、炭酸カルシウム、クレー、ゼオライト、アルミ
ナ、硫酸バリウム等が挙げられる。これら無機フィラー
の形状は、特に限定されないが、平均粒径が1〜70μ
mのものが好ましい。
The inorganic filler used here is talc,
Examples include silica, calcium carbonate, clay, zeolite, alumina, barium sulfate and the like. The shape of these inorganic fillers is not particularly limited, but the average particle size is 1 to 70 μm.
m is preferred.

【0019】発泡シート層用原料であるポリプロピレン
系樹脂には、押出機内で発泡剤を添加して溶融混練す
る。発泡剤として、無機系発泡剤、揮発性発泡剤、分解
型発泡剤が用いられ、これらは混合して用いることがで
きる。無機系発泡剤としては、例えば二酸化炭素、空
気、窒素等が挙げられる。
A foaming agent is added to the polypropylene resin, which is a raw material for the foamed sheet layer, in an extruder and melt-kneaded. As the foaming agent, an inorganic foaming agent, a volatile foaming agent, and a decomposition-type foaming agent are used, and these can be used as a mixture. Examples of the inorganic foaming agent include carbon dioxide, air, and nitrogen.

【0020】また揮発性発泡剤としては、例えばプロパ
ン、ブタン、ペンタン、ヘキサン、シクロブタン、シク
ロペンタン等の脂肪族炭化水素類及び環式脂肪族炭化水
素類が、モノクロロジフロロメタン、トリクロロフロロ
メタン、ジクロロジフロロメタン、ジクロロテトラフロ
ロエタン、メチルクロライド、エチルクロライド、メチ
レンクロライド、等のハロゲン化炭化水素類が挙げられ
る。分解型発泡剤としては、例えばアゾジカルボンアミ
ド、ジニトロソペンタメチレンテトラミン、アゾビスイ
ソブチロニトリル、P,P′−オキシビスベンゼンスル
ホニルヒドラジド、重炭酸ナトリウム等を用いることが
できる。
Examples of the volatile foaming agent include aliphatic hydrocarbons such as propane, butane, pentane, hexane, cyclobutane and cyclopentane and cycloaliphatic hydrocarbons, such as monochlorodifluoromethane, trichlorofluoromethane, Halogenated hydrocarbons such as dichlorodifluoromethane, dichlorotetrafluoroethane, methyl chloride, ethyl chloride, and methylene chloride; As the decomposition-type blowing agent, for example, azodicarbonamide, dinitrosopentamethylenetetramine, azobisisobutyronitrile, P, P'-oxybisbenzenesulfonylhydrazide, sodium bicarbonate and the like can be used.

【0021】ポリプロピレン系樹脂と発泡剤との混合割
合は、樹脂の種類、使用する発泡剤の種類や得ようとす
る発泡倍率等により異なるが、例えば、発泡剤にブタン
を用いた場合、密度0.5〜0.1g/cm3 の発泡体
を得るための発泡剤の混合割合はポリプロピレン系樹脂
100重量部に対して、通常0.2〜5.0重量部であ
る。各無発泡フィルム層の好ましい厚みは、通常30〜
300μm、好ましくは50〜200μmである。
The mixing ratio between the polypropylene resin and the foaming agent varies depending on the type of the resin, the type of the foaming agent used, the expansion ratio to be obtained, and the like. The mixing ratio of the blowing agent to obtain a foam of 0.5 to 0.1 g / cm 3 is usually 0.2 to 5.0 parts by weight based on 100 parts by weight of the polypropylene resin. The preferred thickness of each non-foamed film layer is usually 30 to
It is 300 μm, preferably 50 to 200 μm.

【0022】[0022]

【実施例】以下、実施例を用いて本発明を詳細に説明す
る。
The present invention will be described below in detail with reference to examples.

【0023】実施例1〜6、比較例1 発泡シート層用原料として、Montell Cana
da Inc.の製造に係るポリプロピレン:グレード
名「PF814」100重量部に対し、気泡調節剤とし
てクエン酸モノナトリウム塩を0.2重量部含有させて
使用した。一方、無発泡フィルム層用原料として、内外
層共に日本ポリオレフィン株式会社の製造に係るタルク
を40重量%含有するポリプロピレン:グレード名「C
140Y」を単独で使用するか、或いは、無発泡フィル
ム層中のタルク添加量(wt%)が表1に記載の通りに
なるように、上記「C140Y」に、Montell
Canada Inc.の製造に係るタルクを含有しな
いポリプロピレン:グレード名「SD632」を添加し
て使用した。上記の組成の原料を円柱状冷却ドラムを付
設した三層共押出装置の各押出機内に供給し、発泡シー
ト層用原料中に押出機の途中から発泡剤となるブタンを
上記「PF814」100重量部に対し表1に示す割合
で注入し、それぞれを溶融混練した後、各々の押出機よ
り押出して、環状ダイス内で各原料を合流させた後、環
状ダイスより筒状に押出した。次いで筒状積層体の内側
を円柱状冷却ドラムに接触させて引取りながら冷却し、
切断刃により押出方向に切り開いて積層シートを得た。
Examples 1 to 6, Comparative Example 1 As a raw material for a foamed sheet layer, Montellana was used.
da Inc. Polypropylene used in the production of the product: 0.2 parts by weight of monosodium citrate was used as a cell regulator based on 100 parts by weight of grade name "PF814". On the other hand, as a raw material for a non-foamed film layer, polypropylene containing 40% by weight of talc produced by Nippon Polyolefin Co., Ltd. in both inner and outer layers: grade name "C
140Y ”may be used alone, or“ C140Y ”may be added to Montell such that the amount of talc (wt%) in the non-foamed film layer is as shown in Table 1.
Canada Inc. Polypropylene not containing talc according to the production of No .: added with grade name “SD632”. The raw material having the above composition is supplied into each extruder of a three-layer co-extrusion apparatus provided with a cylindrical cooling drum, and butane, which becomes a foaming agent, is introduced into the raw material for the foamed sheet layer from the middle of the extruder by 100 wt. The mixture was melt-kneaded, extruded from each extruder, the raw materials were combined in an annular die, and then extruded into a cylindrical shape from the annular die. Next, the inside of the cylindrical laminate is cooled while being brought into contact with the cylindrical cooling drum, and cooled,
The sheet was cut open in the extrusion direction by a cutting blade to obtain a laminated sheet.

【0024】得られた積層シートについて、坪量、厚
み、発泡シート層密度を測定すると共に、外観を観察し
た。これらの結果を表1に示す。尚、坪量と厚みについ
ては、全体及び三層各層につき測定した。
With respect to the obtained laminated sheet, the basis weight, thickness and foamed sheet layer density were measured, and the appearance was observed. Table 1 shows the results. The basis weight and thickness were measured for the whole and each of the three layers.

【0025】坪量は以下の測定方法に従った。 ・全体:得られたシートの幅はそのままにて、押出方向
に対し長さ10cmに切り出して重量を測定する。その
結果をもとに1m2 当たりの重量に換算した値をもって
全体の坪量とした。 ・無発泡フィルム層:各層の原料密度と後述の厚み測定
で得られた各層の厚みから1m2 当たりの重量に換算し
て無発泡フィルム層各層の坪量とした。 ・発泡シート層:全体の坪量から無発泡フィルム層の坪
量を引いた値を発泡シート層の坪量とした。
The grammage was measured according to the following measuring method. -Whole: The obtained sheet is cut out to a length of 10 cm in the extrusion direction while keeping the width of the obtained sheet, and the weight is measured. Based on the result, the value converted to the weight per 1 m 2 was used as the total basis weight. - non-foamed film layers: the basis weight of the raw material density and from the thickness of each layer obtained in the thickness measurement described below in terms of weight per 1 m 2 non-foamed film layer each of the layers. -Foam sheet layer: The value obtained by subtracting the basis weight of the non-foamed film layer from the total basis weight was defined as the basis weight of the foam sheet layer.

【0026】厚みは、以下の測定方法に従った。 ・全体:無作為に選んだ10箇所の厚みの相加平均値を
もって全体の厚みとした。 ・各層:積層シートを任意の箇所で厚み方法に切断す
る。その切断面を顕微鏡で10倍に拡大して各層に対し
て無作為に10か所選んで厚みを測定し、各々相加平均
して各層の厚みとした。
The thickness was measured according to the following measuring method. -Whole: The arithmetic mean value of the thickness of 10 places selected at random was taken as the whole thickness. -Each layer: The laminated sheet is cut at an arbitrary position by a thickness method. The cut surface was magnified 10 times with a microscope, and ten layers were randomly selected for each layer, the thickness was measured, and the arithmetic average was obtained to obtain the thickness of each layer.

【0027】発泡シート層密度は、発泡シート層の上記
坪量と上記厚みから発泡シート層の密度を算出した。
The density of the foamed sheet layer was calculated from the basis weight and the thickness of the foamed sheet layer.

【0028】積層シートの外観(円柱状冷却ドラム接触
面)については、その外観を目視にて観察して次の基準
により判定した。 〇:平滑性に優れ、良好。 △:平滑性にやや劣るが、許容範囲内。 ×:全面に凹凸が激しく生じ、部分的に無発泡層の捲れ
が生じている。
The appearance of the laminated sheet (the contact surface with the cylindrical cooling drum) was visually observed and judged according to the following criteria. 〇: Excellent in smoothness, good. Δ: Slightly poor in smoothness, but within the allowable range. ×: Intense irregularities are generated on the entire surface, and the non-foamed layer is partially turned up.

【0029】[0029]

【表1】 [Table 1]

【0030】[0030]

【発明の効果】以上説明したように本発明の熱成形用積
層シートの製造方法は、ポリプロピレン系樹脂発泡シー
ト層を形成する原料とポリプロピレン系樹脂無発泡フィ
ルム層を形成する原料とをそれぞれ押出機に供給し、こ
れらをダイス内部で合流した後に環状ダイスより大気中
に押出して発泡シート層用原料を発泡させ、発泡シート
層の両面に無発泡フィルム層が積層した筒状の積層体を
得、次いで筒状積層体内面を円柱状冷却ドラム周面に接
触させて引き取り、切り開いてシート状として、密度が
0.5乃至0.1g/cm3 及び厚みがが0.5〜5.
0mmのポリプロピレン系樹脂発泡シート層の両面にポ
リプロピレン系樹脂無発泡フィルム層が一体化された熱
成形用積層シートの製造方法において、少なくとも円柱
状冷却用ドラム側に位置するポリプロピレン系樹脂無発
泡フィルム層を形成する原料中には10重量%以上、好
ましくは15重量%以上の無機フィラーが含有されてい
ることにより、押出された筒状積層体の内側の無発泡フ
ィルム層が円柱状冷却用ドラム表面に引っ掛かることが
なく、スムーズに引き取りが行える。その結果、得られ
た積層シートは、一定した安定な品質を持った製品にな
ると共に、外観形状に優れる。また本発明により得られ
る積層シートは、熱成形を行った場合には、剛性や耐熱
性等に優れた製品を得ることができる。
As described above, the method for producing a laminated sheet for thermoforming according to the present invention comprises the steps of extruding a raw material for forming a foamed polypropylene resin sheet layer and a raw material for forming a non-foamed polypropylene resin film layer by an extruder. After these are merged inside the die, they are extruded into the atmosphere from an annular die to foam the foam sheet layer raw material, and a tubular laminate in which a non-foamed film layer is laminated on both sides of the foam sheet layer is obtained. Then, the inner surface of the cylindrical laminated body is brought into contact with the peripheral surface of the cylindrical cooling drum, pulled out, cut out and formed into a sheet, and has a density of 0.5 to 0.1 g / cm 3 and a thickness of 0.5 to 5.
In a method for producing a laminated sheet for thermoforming, in which a polypropylene resin non-foamed film layer is integrated on both sides of a 0 mm polypropylene resin foamed sheet layer, a polypropylene resin non-foamed film layer located at least on a cylindrical cooling drum side In the raw material for forming a non-foamed film layer, the non-foamed film layer inside the extruded cylindrical laminate is formed by a columnar cooling drum surface because the raw material for forming contains an inorganic filler of 10% by weight or more, preferably 15% by weight or more. It can be picked up smoothly without getting caught on the surface. As a result, the obtained laminated sheet becomes a product having constant and stable quality, and is excellent in appearance and shape. Further, when the laminated sheet obtained by the present invention is subjected to thermoforming, a product excellent in rigidity, heat resistance and the like can be obtained.

【0031】また、本発明では、筒状積層体の外側に位
置するポリプロピレン系樹脂無発泡フィルム層を形成す
る原料中に、10重量%以上、好ましくは15重量%以
上の無機フィラーを含有させることにより、熱成形用積
層シート、ひいてはその積層シートから得られる熱成形
品の耐熱性及び剛性が一層高まる。
Further, in the present invention, the raw material for forming the polypropylene resin non-foamed film layer located outside the cylindrical laminated body contains 10% by weight or more, preferably 15% by weight or more of an inorganic filler. Thereby, the heat resistance and rigidity of the laminated sheet for thermoforming, and the thermoformed product obtained from the laminated sheet are further enhanced.

【0032】また、(1)式で示される範囲で無機フィ
ラーを含有する場合には、表面に凹凸のない極めて外観
が美麗で良好な積層シートが得られると共に、無発泡フ
ィルム層と発泡シート層との融着が強固で、両者の間に
は剥離も起こらず、強固に一体化した積層シートが得ら
れる。
In addition, when the inorganic filler is contained in the range represented by the formula (1), a laminated sheet having a beautiful appearance and excellent appearance without irregularities on the surface can be obtained, and a non-foamed film layer and a foamed sheet layer can be obtained. Is strongly bonded, no separation occurs between the two, and a strongly integrated laminated sheet is obtained.

【図面の簡単な説明】[Brief description of the drawings]

【図1】円柱状冷却用ドラムと接する側のポリプロピレ
ン系樹脂無発泡フィルム層への無機フィラーの最大添加
量のポリプロピレン系樹脂発泡シート層の密度の違いに
よる変化を示すグラフである。
FIG. 1 is a graph showing a change in the maximum amount of an inorganic filler added to a polypropylene resin non-foamed film layer on the side in contact with a cylindrical cooling drum due to a difference in density of a polypropylene resin foam sheet layer.

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 FI B29K 105:04 105:16 B29L 9:00 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 6 Identification code FI B29K 105: 04 105: 16 B29L 9:00

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】 ポリプロピレン系樹脂発泡シート層を形
成する原料とポリプロピレン系樹脂無発泡フィルム層を
形成する原料とをそれぞれ押出機に供給し、これらをダ
イス内部で合流した後環状ダイスより押出して、発泡シ
ート層を形成する原料を発泡させ、発泡シート層の両面
に無発泡フィルム層を積層した筒状の積層体を形成し、
次いで筒状積層体の内面側を円柱状冷却ドラム周面に接
触させて引取りながら冷却し、切り開いてシート状と
し、密度が0.5乃至0.1g/cm3 及び厚みが0.
5〜5.0mmのポリプロピレン系樹脂発泡シート層の
両面にポリプロピレン系樹脂無発泡フィルム層が積層し
て一体化された熱成形用積層シートの製造方法におい
て、少なくとも円柱状冷却ドラムと接する側のポリプロ
ピレン系樹脂無発泡フィルム層を形成する原料中に10
重量%以上の無機フィラーが含有されていることを特徴
とする熱成形用積層シートの製造方法。
1. A raw material for forming a foamed polypropylene resin sheet layer and a raw material for forming a non-foamed polypropylene resin film layer are respectively supplied to an extruder, and they are merged inside a die and then extruded from an annular die. The raw material forming the foamed sheet layer is foamed to form a tubular laminate in which the non-foamed film layers are laminated on both sides of the foamed sheet layer,
Next, the inner surface side of the cylindrical laminate is cooled while taking it into contact with the peripheral surface of the cylindrical cooling drum, cut open to form a sheet, and has a density of 0.5 to 0.1 g / cm 3 and a thickness of 0.5 g / cm 3 .
In a method for producing a laminated sheet for thermoforming in which a polypropylene-based resin non-foamed film layer is laminated on both sides of a 5-5.0 mm polypropylene-based resin foamed sheet layer and integrated with each other, at least the polypropylene in contact with the cylindrical cooling drum 10 in the raw material forming the non-foamed film layer
A method for producing a laminated sheet for thermoforming, characterized by containing at least an inorganic filler by weight.
【請求項2】 円柱状冷却ドラムと接する側のポリプロ
ピレン系樹脂無発泡フィルム層を形成する原料中に15
重量%以上の無機フィラーが含有されていることを特徴
とする請求項1記載の熱成形用積層シートの製造方法。
2. The raw material for forming the polypropylene resin non-foamed film layer on the side in contact with the cylindrical cooling drum contains 15
The method for producing a laminated sheet for thermoforming according to claim 1, wherein an inorganic filler is contained in an amount of not less than% by weight.
【請求項3】 筒状積層体の外側に位置するポリプロピ
レン系樹脂無発泡フィルム層を形成する原料中に、10
重量%以上の無機フィラーが含有されていることを特徴
とする請求項1または2記載の熱成形用積層シートの製
造方法。
3. A raw material for forming a polypropylene resin non-foamed film layer located outside the cylindrical laminate,
The method for producing a laminated sheet for thermoforming according to claim 1, wherein an inorganic filler is contained in an amount of not less than% by weight.
【請求項4】 無機フィラーを含有するポリプロピレン
系樹脂無発泡フィルム層を形成する原料中に、下記式
(1)にて示される範囲の量の無機フィラーを含有する
請求項1乃至3のいずれか記載の熱成形用積層シートの
製造方法。 【数1】 10≦f (X) ≦−277X2 +244X−3.09 ・・・(1) 但し、f(X) :無機フィラーの含有量〔重量%〕 X :発泡シート層の密度〔g/cm3
4. A raw material for forming a polypropylene resin non-foamed film layer containing an inorganic filler, wherein the raw material contains an inorganic filler in an amount represented by the following formula (1). A method for producing a laminated sheet for thermoforming according to the above. 10 ≦ f (X) ≦ −277X 2 + 244X−3.09 (1) where f (X): content of inorganic filler [% by weight] X: density of foam sheet layer [g] / Cm 3 ]
JP29157297A 1997-10-08 1997-10-08 Method for producing laminated sheet for thermoforming Expired - Fee Related JP3797639B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP29157297A JP3797639B2 (en) 1997-10-08 1997-10-08 Method for producing laminated sheet for thermoforming

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP29157297A JP3797639B2 (en) 1997-10-08 1997-10-08 Method for producing laminated sheet for thermoforming

Publications (2)

Publication Number Publication Date
JPH11105132A true JPH11105132A (en) 1999-04-20
JP3797639B2 JP3797639B2 (en) 2006-07-19

Family

ID=17770667

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
JP (1) JP3797639B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6986941B2 (en) 2001-11-30 2006-01-17 Jsp Corporation Multiple layers laminated polyolefin foam
JP2007517697A (en) * 2004-01-06 2007-07-05 ダウ グローバル テクノロジーズ インコーポレイティド Multilayer polymer sheet
JP2014144559A (en) * 2013-01-28 2014-08-14 Jsp Corp Thermoplastic resin hollow plate, molded body composed of the hollow plate
JP2017144597A (en) * 2016-02-16 2017-08-24 日本ポリプロ株式会社 Multilayer foamed sheet having non-foamed layer containing long chain branched polypropylene resin composition

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6986941B2 (en) 2001-11-30 2006-01-17 Jsp Corporation Multiple layers laminated polyolefin foam
JP2007517697A (en) * 2004-01-06 2007-07-05 ダウ グローバル テクノロジーズ インコーポレイティド Multilayer polymer sheet
JP2014144559A (en) * 2013-01-28 2014-08-14 Jsp Corp Thermoplastic resin hollow plate, molded body composed of the hollow plate
JP2017144597A (en) * 2016-02-16 2017-08-24 日本ポリプロ株式会社 Multilayer foamed sheet having non-foamed layer containing long chain branched polypropylene resin composition

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