JPH1120061A - Laminated sheet - Google Patents

Laminated sheet

Info

Publication number
JPH1120061A
JPH1120061A JP17579597A JP17579597A JPH1120061A JP H1120061 A JPH1120061 A JP H1120061A JP 17579597 A JP17579597 A JP 17579597A JP 17579597 A JP17579597 A JP 17579597A JP H1120061 A JPH1120061 A JP H1120061A
Authority
JP
Japan
Prior art keywords
sheet
resin
cross
sliced
laminated
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
JP17579597A
Other languages
Japanese (ja)
Other versions
JP3396400B2 (en
Inventor
Kenji Kato
健二 加藤
Ippei Fujimoto
一平 藤本
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
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 Sekisui Chemical Co Ltd filed Critical Sekisui Chemical Co Ltd
Priority to JP17579597A priority Critical patent/JP3396400B2/en
Publication of JPH1120061A publication Critical patent/JPH1120061A/en
Application granted granted Critical
Publication of JP3396400B2 publication Critical patent/JP3396400B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Laminated Bodies (AREA)

Abstract

PROBLEM TO BE SOLVED: To have good heat resistance and moldability, and also have excellent feelings and pliability at low cost by laminating an adhesive resin layer on the sliced surface by slicing a cross-linked closed cell foamed sheet having a specification in a blend ratio of polypropylene resin and polyethylene resin and a gel rate. SOLUTION: The cross-linked closed cell foamed body sheet consists of polypropylene resin and polyethylene resin, and a blend of the polypropylene resin is limited to 40-90 wt.% because its heat resistance lowers as it becomes small and its resistance lowers relative to feelings, pliability, and compression at an ordinary temperature as it becomes large. Also, a gel rate of the cross- linked closed cell foamed body is limited to 20-70 wt.%. The cross-linked closed cell foamed sheet is sliced into a sheet, and an adhesive resin layer is laminated on the sliced surface of the sliced sheet.

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、特に、真空成形
法、スタンピング成形法によって成形されるドア、イン
スツルメントパネル等の車両内装材に好適に用いられる
積層シートに関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated sheet suitably used for a vehicle interior material such as a door and an instrument panel formed by a vacuum molding method or a stamping molding method.

【0002】[0002]

【従来の技術】近年、真空成形法、スタンピング成形法
によって成形される車両内装材は、ドライバーの多くの
嗜好をいれ、その形状が複雑になり、特に、ドア、イン
スツルメントパネル等に用いられる合成樹脂発泡体シー
トは、真空成形の成形深さが益々深くなってきている。
特に、アームレストや木目込み部等において、その展開
率が極めて大きなものとなるため、しばしば上記合成樹
脂発泡体シートが切断する、「フォーム切れ」現象が起
こるに至っている。
2. Description of the Related Art In recent years, vehicle interior materials formed by a vacuum forming method or a stamping forming method have been desired by many drivers and their shapes have become complicated, and are particularly used for doors, instrument panels and the like. As for synthetic resin foam sheets, the forming depth of vacuum forming is becoming increasingly deeper.
In particular, in the armrests and the wood-grained portions and the like, the expansion rate becomes extremely large, so that the above-mentioned "foam break" phenomenon, in which the synthetic resin foam sheet is often cut, has occurred.

【0003】又、スタンピング成形においても、最近で
は、予め凹凸の浅い真空成形法で予備成形された後、ス
タンピング成形が行われるのが主流となってきている。
従って、スタンピング成形に用いられる合成樹脂発泡体
シートにも真空成形と同様に高い展開率が求められるよ
うになってきている。
In recent years, the mainstream of stamping molding has been to perform preforming by a vacuum forming method with a small depth of unevenness and then to perform stamping molding.
Accordingly, a high expansion rate is required for a synthetic resin foam sheet used for stamping molding as in vacuum molding.

【0004】更に、合成樹脂発泡体シートに表装材を積
層した従来の表皮付き発泡体シートは、予め真空成形し
て所望の凹状形状に成形し、該凹所に溶融した熱可塑性
樹脂からなる骨材を充填し、ホットスタンピング成形法
を用いて凸型で型押して賦形する方法が採られている
が、この場合、「樹脂抱き込み」と称される現象、即
ち、上記発泡体シートのセル内に骨材の熱可塑性樹脂が
部分的に侵入し、著しい場合にはこの侵入した骨材の熱
可塑性樹脂によって発泡体シートに引き裂き傷が入った
り、部分的に千切れたりする成形トラブルが起きるもの
であって、スタンピング成形用の合成樹脂発泡体シート
に真空成形性や耐熱性の向上が熱望されている現状にあ
る。
Further, a conventional foamed sheet with a skin in which a covering material is laminated on a synthetic resin foamed sheet is formed into a desired concave shape by vacuum forming in advance, and a bone made of a thermoplastic resin melted in the concave portion. The material is filled, and a method of embossing with a convex shape using a hot stamping molding method is employed. In this case, a phenomenon called “resin embrace”, that is, a cell of the foam sheet is used. The thermoplastic resin of the aggregate partially invades into the inside, and in a severe case, the thermoplastic resin of the infiltrated aggregate causes a tear in the foam sheet or a molding trouble such as a partial breakage. At present, there is a strong demand for improved vacuum moldability and heat resistance of synthetic resin foam sheets for stamping molding.

【0005】現状では上記事情を勘案し、車両内装用の
スタンピング成形用合成樹脂発泡体シートとしては、嵩
密度が0.06〜0.1g/ccのポリプロピレン系樹
脂架橋発泡体シートが主に用いられている。然るに、上
記嵩密度範囲のポリプロピレンを主成分とするポリプロ
ピレン系樹脂架橋発泡体シートは、未だ、常温において
堅い触感を呈するものであって、良好な触感と柔軟性が
得られないといった問題があったが、嵩密度が0.05
g/cc以下のポリプロピレン系樹脂架橋発泡体シート
は、上述したようにスタンピング成形用には耐熱性及び
成形性において問題点を有するものであった。
At present, in view of the above circumstances, a crosslinked polypropylene resin sheet having a bulk density of 0.06 to 0.1 g / cc is mainly used as a synthetic resin foam sheet for stamping molding for vehicle interiors. Have been. However, the polypropylene-based resin cross-linked foam sheet containing polypropylene in the above bulk density range as a main component still has a hard touch at room temperature, and has a problem that a good touch and flexibility cannot be obtained. Has a bulk density of 0.05
As described above, the polypropylene resin crosslinked foam sheet having a g / cc or less has problems in heat resistance and moldability for stamping molding.

【0006】上記ポリプロピレン系樹脂架橋発泡体シー
トの堅い触感を改善する試みとして、上記ポリプロピレ
ン系樹脂架橋発泡体シートの表面に低密度のポリプロピ
レン系樹脂シートを熱ラミネートによって積層する方法
が提案されている。しかし、上記方法は、ポリプロピレ
ン系樹脂架橋発泡体シートに低密度のポリプロピレン系
樹脂シートを熱ラミネートするために相当にコストアッ
プとなり、厚さが1mm以下の低密度の薄物のポリプロ
ピレン系樹脂発泡体シートを広幅でラミネートする必要
があり、上記ラミネート工程自体極めて難しい課題を有
するものであった。 更に、得られた積層シートの真空
成形やスタンピング成形時に、加熱され軟化した積層シ
ートが自重で垂れ下がり、複雑に折り畳まれる所謂「タ
レ」現象を起こし易く、これらの成形性にも問題点を有
するものであった。
As an attempt to improve the firm feel of the crosslinked polypropylene resin sheet, a method has been proposed in which a low density polypropylene resin sheet is laminated on the surface of the crosslinked foamed polypropylene resin sheet by thermal lamination. . However, the above method considerably increases the cost because the low-density polypropylene-based resin sheet is thermally laminated with the polypropylene-based resin cross-linked foam sheet, and the low-density thin polypropylene-based resin foam sheet having a thickness of 1 mm or less. Need to be laminated in a wide width, and the laminating step itself has a very difficult problem. Furthermore, when vacuum-forming or stamping molding of the obtained laminated sheet, the heated and softened laminated sheet hangs down by its own weight, easily causing a so-called "sagging" phenomenon in which the laminated sheet is folded in a complicated manner, and also has a problem in these moldability. Met.

【0007】[0007]

【発明が解決しようとする課題】本発明は、叙上の事実
に鑑みなされたものであって、その目的は、耐熱性及び
成形性を良好に保持しつつ、且つ、低コストで良好な触
感と柔軟性を有する積層シートを提供することにある。
DISCLOSURE OF THE INVENTION The present invention has been made in view of the above facts, and has as its object to provide a low cost, good tactile sensation while maintaining good heat resistance and moldability. And to provide a laminated sheet having flexibility.

【0008】[0008]

【課題を解決するための手段】本発明は、ポリプロピレ
ン系樹脂40〜90重量%とポリエチレン系樹脂60〜
10重量%からなり、ゲル分率が20〜70%である架
橋独立気泡型発泡体シートをにスライスして得られたシ
ートのスライス面に、接着性樹脂層が積層されてなるこ
とを特徴とする積層シートをその要旨とする。
SUMMARY OF THE INVENTION The present invention relates to a method for producing a polypropylene resin of 40 to 90% by weight and a polyethylene resin of 60 to 90% by weight.
An adhesive resin layer is laminated on a sliced surface of a sheet obtained by slicing a cross-linked closed cell foam sheet having 10% by weight and having a gel fraction of 20 to 70%. The gist of the laminated sheet is as follows.

【0009】本発明においてポリプロピレン系樹脂は、
特に限定されるものではないが、例えば、プロピレンの
ホモポリマー、プロピレンとこれと重合可能なエチレン
等のコモノマーとのブロックコポリマーないしはランダ
ムコポリマー、プロピレンとエチレン及びブテン等のタ
ーポリマー等が挙げられる。これらは単独で用いられて
もよいが、2種以上が混合して用いられてもよい。
In the present invention, the polypropylene resin is
Although not particularly limited, examples thereof include a homopolymer of propylene, a block copolymer or random copolymer of propylene and a copolymerizable monomer such as ethylene, and a terpolymer of propylene with ethylene and butene. These may be used alone or as a mixture of two or more.

【0010】上記ポリプロピレン系樹脂のメルトフロー
レート(MFR)は、好ましくは0.3〜20g/10
分、より好ましくは0.4〜10g/10分である。上
記ポリプロピレン系樹脂のMFRが0.3g/10分未
満では、シート化する成形技術が難しくなり、得られる
シートもその表面が荒れて粗面となり易く、又、MFR
が20g/10分を超えると、得られるシートの耐熱性
及び高温時の伸びが低下し、成形性が低下する。尚、上
記ポリプロピレン系樹脂のMFRは、JIS K 72
10に基づき、温度230℃、荷重2.16kgfで測
定された値である。
The melt flow rate (MFR) of the polypropylene resin is preferably 0.3 to 20 g / 10
Min, more preferably 0.4 to 10 g / 10 min. If the MFR of the polypropylene-based resin is less than 0.3 g / 10 minutes, the molding technique for forming a sheet becomes difficult, and the resulting sheet tends to have a rough and rough surface.
If it exceeds 20 g / 10 minutes, the heat resistance and elongation at high temperature of the obtained sheet will decrease, and the moldability will decrease. The MFR of the polypropylene resin is JIS K72
This is a value measured based on No. 10 at a temperature of 230 ° C. and a load of 2.16 kgf.

【0011】又、本発明においてポリエチレン系樹脂
は、特に限定されるものではないが、例えば、高密度ポ
リエチレン系樹脂、中密度ポリエチレン系樹脂、低密度
ポリエチレン系樹脂、超低密度ポリエチレン系樹脂等エ
チレンのホモポリマー、エチレンとこれと重合可能なα
−オレフィン等のコモノマーとのコポリマーである線状
邸密度ポリエチレン系樹脂等が挙げられる。これらは単
独で用いられてもよいが、2種以上が混合して用いられ
てもよい。上記ポリエチレン系樹脂のうち、線状低密度
ポリエチレン系樹脂は、常温及び100℃付近の高温の
両方において高い伸びを示すので特に好適に用いられ
る。
In the present invention, the polyethylene resin is not particularly limited, but examples thereof include high-density polyethylene resin, medium-density polyethylene resin, low-density polyethylene resin, and ultra-low-density polyethylene resin. Homopolymer of ethylene and α capable of polymerizing with ethylene
A linear resin density polyethylene resin which is a copolymer with a comonomer such as an olefin; These may be used alone or as a mixture of two or more. Among the above-mentioned polyethylene resins, a linear low-density polyethylene resin is particularly preferably used because it exhibits high elongation both at room temperature and at a high temperature of around 100 ° C.

【0012】又、上記ポリエチレン系樹脂のMFRは、
好ましくは1.0〜20g/10分、より好ましくは
1.5〜10g/10分である。上記ポリエチレン系樹
脂のMFRが1.0g/10分未満では、シート化する
成形技術が難しくなり、得られるシートもその表面が荒
れて粗面となり易く、又、MFRが20g/10分を超
えると、得られるシートの伸びが低下し、真空成形が難
しくなる。尚、上記ポリエチレン系樹脂のMFRは、J
IS K 7210に基づき、温度190℃、荷重2.
16kgfで測定された値である。
The MFR of the polyethylene resin is
Preferably it is 1.0 to 20 g / 10 min, more preferably 1.5 to 10 g / 10 min. If the MFR of the polyethylene-based resin is less than 1.0 g / 10 min, the molding technique for forming a sheet becomes difficult, and the resulting sheet tends to be rough and rough, and if the MFR exceeds 20 g / 10 min. In addition, the elongation of the resulting sheet is reduced, making vacuum forming difficult. The MFR of the polyethylene resin is J
Based on IS K 7210, temperature 190 ° C, load 2.
This is a value measured at 16 kgf.

【0013】本発明における架橋独立気泡型発泡体シー
トは、上記ポリプロピレン系樹脂及びポリエチレン系樹
脂からなり、ポリプロピレン系樹脂の配合量は、少なく
なると耐熱性が低下し、多くなると常温での触感、柔軟
性及び圧縮に対する抵抗性が低下するので40〜90重
量%に限定され、ポリエチレン系樹脂は60〜10重量
%に限定される。
The cross-linked closed-cell foam sheet of the present invention comprises the above-mentioned polypropylene resin and polyethylene resin. When the blending amount of the polypropylene resin is small, the heat resistance is reduced. The content and the resistance to compression are reduced, so that the content is limited to 40 to 90% by weight and the content of the polyethylene resin is limited to 60 to 10% by weight.

【0014】上記架橋独立気泡型発泡体シートを得る方
法として従来公知の任意の方法が採用でき、例えば、上
記ポリプロピレン系樹脂及びポリエチレン系樹脂からな
る混合樹脂に、発泡剤、架橋助剤等の添加剤を添加し、
発泡性樹脂組成物粗シートの成形、電子線等の電離
性放射線の照射、加熱発泡の3工程からなる方法、上
記工程を除き、工程において化学架橋剤を配合した
発泡性樹脂組成物からなる発泡性樹脂組成物シートを加
熱発泡させる方法等が挙げられる。
As a method for obtaining the above-mentioned cross-linked closed-cell foamed sheet, any conventionally known method can be employed. For example, a foaming agent, a cross-linking auxiliary agent and the like are added to a mixed resin comprising the above-mentioned polypropylene resin and polyethylene resin. Add the agent,
Forming of a foamable resin composition coarse sheet, irradiation of ionizing radiation such as an electron beam, and heating and foaming, and a foaming process comprising a foaming resin composition containing a chemical crosslinking agent in the process except for the above process. For example, a method of heating and foaming the conductive resin composition sheet.

【0015】上記発泡剤は、その分解温度が上記混合樹
脂の溶融温度よりも高いものであれば、特に限定される
ものではなく、例えば、アゾジカルボンアミド、ヒドラ
ゾジカルボンアミド、アゾジカルボン酸アミド、アゾジ
カルボン酸バリウム塩、ジニトロソペンタエチレンテト
ラミン、ニトロソグアニジン、p,p’−オキシビスベ
ンゼンスルホニルセミカルバジド等が挙げられる。これ
らは単独で用いられてもよいが、2種以上が混合して用
いられてもよい。
The foaming agent is not particularly limited as long as its decomposition temperature is higher than the melting temperature of the mixed resin. For example, azodicarbonamide, hydrazodicarbonamide, azodicarboxylic acid amide, Barium azodicarboxylate, dinitrosopentaethylenetetramine, nitrosoguanidine, p, p'-oxybisbenzenesulfonyl semicarbazide and the like. These may be used alone or as a mixture of two or more.

【0016】上記発泡剤の添加量は、上記混合樹脂10
0重量部に対して、好ましくは1〜50重量部、より好
ましくは1〜30重量部である。
The amount of the foaming agent to be added depends on the amount of the mixed resin 10
The amount is preferably 1 to 50 parts by weight, more preferably 1 to 30 parts by weight, based on 0 parts by weight.

【0017】又、上記混合樹脂の架橋助剤は、特に限定
されるものではなく、例えば、ジビニルベンゼン、1,
6−ヘキサンジオールジメタクリレート、1,9−ノナ
ンジオールジ(メタ)アクリレート、1,10−デカン
ジオールジ(メタ)アクリレート、ジビニルナフタレ
ン、ジビニルトルエン、トリメチロールプロパントリメ
タクリレート、トリアリルトリメート、トリアリルシア
ヌレート等が挙げられる。これらは単独で用いられても
よいが、2種以上が混合して用いられてもよい。
The crosslinking aid for the mixed resin is not particularly limited. For example, divinylbenzene, 1,
6-hexanediol dimethacrylate, 1,9-nonanediol di (meth) acrylate, 1,10-decanediol di (meth) acrylate, divinylnaphthalene, divinyltoluene, trimethylolpropane trimethacrylate, triallyl trimate, triaryl Lucyanurate and the like. These may be used alone or as a mixture of two or more.

【0018】上記架橋助剤の添加量は、上記混合樹脂1
00重量部に対して、好ましくは0.5〜30重量部、
より好ましくは2〜15重量部である。上記架橋助剤の
添加量が0.5重量部未満では、得られる架橋独立気泡
型発泡体シートの架橋度が小さくなり、十分なゲル分率
が得られ難くなり、30重量部を超えると、架橋度、ゲ
ル分率が大きくなり、堅くなり過ぎて良好な触感や柔軟
性が得られ難くなる。
The amount of the cross-linking aid to be added depends on the amount of the mixed resin 1
0.5 to 30 parts by weight, based on 00 parts by weight,
More preferably, it is 2 to 15 parts by weight. When the addition amount of the crosslinking aid is less than 0.5 part by weight, the degree of crosslinking of the obtained cross-linked closed cell foam sheet becomes small, and it becomes difficult to obtain a sufficient gel fraction, and when it exceeds 30 parts by weight, The degree of cross-linking and the gel fraction become large, and it becomes too hard to obtain a good touch and flexibility.

【0019】上記架橋独立気泡型発泡体シートのゲル分
率は、20〜70%に限定される。上記架橋独立気泡型
発泡体シートのゲル分率が20%未満では、耐熱性が十
分に得られず、真空成形やスタンピング成形等の成形加
工工程における表面荒れ等のトラブルの原因となり、
又、70%を超えると、発泡工程における発泡の安定性
が得られ難く、発泡不良や異常発泡の原因となるので、
上記範囲に限定され、好ましくは30〜70%であり、
特に耐熱性が要求されるスタンピング成形においては、
より好ましくは40〜70%である。尚、ゲル分率は、
上記架橋独立気泡型発泡体シートの厚さ方向に100m
gの試料を採り、120℃のキシレン中に浸漬し、濾別
した溶解残渣を乾燥し、秤量して、次式によって算出さ
れたものである。
The gel fraction of the crosslinked closed-cell foam sheet is limited to 20 to 70%. If the gel fraction of the cross-linked closed-cell foam sheet is less than 20%, sufficient heat resistance cannot be obtained, causing troubles such as surface roughness in a forming process such as vacuum forming or stamping,
On the other hand, if it exceeds 70%, it is difficult to obtain foaming stability in the foaming process, which causes poor foaming or abnormal foaming.
Limited to the above range, preferably 30 to 70%,
Especially in stamping molding where heat resistance is required,
More preferably, it is 40 to 70%. The gel fraction is
100 m in the thickness direction of the cross-linked closed cell foam sheet
A sample of g was taken, immersed in xylene at 120 ° C., and the dissolved residue filtered out was dried, weighed, and calculated by the following equation.

【0020】〔(溶解残渣重量)/(試料重量=100
mg)〕×100
[(Dissolved residue weight) / (sample weight = 100
mg)] × 100

【0021】上記架橋独立気泡型発泡体シートの嵩密度
は、表層から中央部にわたって略均質の嵩密度を示すも
のであってもよいが、上記架橋独立気泡型発泡体シート
の製造工程における電離性放射線の照射を複数回施し、
2回目以降の照射を低電圧で行う等の方法により、表層
の架橋度を中央部付近より高め、表層の嵩密度が大き
く、中央部付近の嵩密度が小さくなるなるように厚さ方
向に嵩密度の勾配をもたせたものであってもよい。
The bulk density of the above-mentioned cross-linked closed-cell foam sheet may be substantially uniform from the surface layer to the central portion. Irradiation multiple times,
The second and subsequent irradiations are performed at a low voltage, for example, by increasing the degree of cross-linking of the surface layer from the vicinity of the center, and increasing the bulk density in the thickness direction so that the bulk density of the surface layer is large and the bulk density near the center is small. It may have a density gradient.

【0022】特に表層の嵩密度が大きく、中央部付近の
嵩密度が小さくなるなるように厚さ方向に嵩密度の勾配
をもたせた架橋独立気泡型発泡体シートは、その中央部
付近でスライスすると、該スライス面は、嵩密度が小さ
く柔らかい触感が付与されたものとなっており、表皮付
近の嵩密度の大きい部分は、前記する真空成形やスタン
ピング成形等の成形加工工程における耐熱性がより十分
に付与されているものとなっている。
In particular, a cross-linked closed-cell foam sheet having a bulk density gradient in the thickness direction such that the bulk density of the surface layer is large and the bulk density near the center becomes small, when sliced near the center, The sliced surface has a soft touch with a low bulk density, and the portion having a high bulk density in the vicinity of the epidermis has more sufficient heat resistance in the forming process such as the vacuum forming and stamping. It has been given to.

【0023】上記架橋独立気泡型発泡体シートは、シー
ト状にスライスされる。上記スライスされたシートの厚
さは、車両内装材等の用途に応じて適宜設定されるもの
であるが、通常、0.5〜5mm、好ましくは1〜4m
m程度である。上記スライスの方法は、用途毎に設定さ
れた厚さの2倍の厚さの架橋独立気泡型発泡体シートを
作製し、これを一面がスライス面、反対の背面に表皮層
を残したシートの2枚にスライスされてもよく、又、用
途毎に設定された厚さより若干厚目に架橋独立気泡型発
泡体シートを作製し、該発泡体シートの一表面の表皮層
をスライスして除き、一面がスライス面、反対の背面に
表皮層を残したシートとされてもよい。
The above-mentioned cross-linked closed cell foam sheet is sliced into a sheet. The thickness of the sliced sheet is appropriately set according to the use of the vehicle interior material or the like, but is usually 0.5 to 5 mm, preferably 1 to 4 m.
m. The above-mentioned slicing method is to prepare a cross-linked closed-cell foam sheet having a thickness twice as large as the thickness set for each application, and to form a sheet having one surface as a slice surface and the skin layer on the opposite back surface. It may be sliced into two pieces, or a crosslinked closed-cell foam sheet is made slightly thicker than the thickness set for each application, and the skin layer on one surface of the foam sheet is removed by slicing, One surface may be a slice surface, and a sheet having a skin layer left on the opposite back surface.

【0024】又、スライスされたシートの嵩密度(スラ
イス面より0.5mm内側の試料で測定)は、好ましく
は0.02〜0.05g/cc、より好ましくは0.0
4〜0.05g/ccである。上記嵩密度が0.02g
/cc未満では、前記する真空成形やスタンピング成形
等の成形加工が難しくなり、又、該成形加工後、得られ
た成形品は「へたり」易く、圧縮応力が小さく、且つ、
その回復も悪くなる。又、0.05g/ccを超える
と、堅くなって良好な触感が得られ難くなる。因みに、
スライス前の架橋独立気泡型発泡体シートの嵩密度は、
0.025〜0.05g/cc程度であり、スライスに
よって一部表皮部分が切除される場合がある。
The bulk density of the sliced sheet (measured on a sample 0.5 mm inside the sliced surface) is preferably 0.02 to 0.05 g / cc, more preferably 0.02 to 0.05 g / cc.
4 to 0.05 g / cc. The bulk density is 0.02 g
If it is less than / cc, molding such as vacuum molding and stamping molding described above becomes difficult, and after the molding, the obtained molded product is easily set, has a small compressive stress, and
Its recovery is also worse. On the other hand, if it exceeds 0.05 g / cc, it becomes hard and it becomes difficult to obtain a good touch. By the way,
The bulk density of the cross-linked closed cell foam sheet before slicing is
It is about 0.025 to 0.05 g / cc, and a part of the epidermis may be cut off by a slice.

【0025】上記スライスされたシートのスライス面に
は接着性樹脂層が積層される。上記接着性樹脂層に用い
られる接着性樹脂とは、常態において感圧接着性を有す
る塑性加工が可能な樹脂であり、具体的には、後述する
表皮材を該接着性樹脂層上に貼付して表皮材付き積層シ
ートとした場合、積層シートの良好な触感を損なうこと
のないものであれば特に限定されるものではないが、例
えば、エチレン−アクリル酸エチル−無水マレイン酸共
重合体、エチレン−アクリル酸エチル共重合体、エチレ
ン−酢酸ビニル共重合体等が挙げられ、中でもエチレン
−アクリル酸エチル−無水マレイン酸共重合体が好まし
い。上記架橋独立気泡型発泡体シートのスライス面に接
着性樹脂層を積層する手段は、特に限定されるものでは
なく、押出ラミネート法が用いられてもよく、又、熱ラ
ミネート法が用いられてもよい。
An adhesive resin layer is laminated on the slice surface of the sliced sheet. The adhesive resin used for the adhesive resin layer is a resin that can be subjected to plastic processing having pressure-sensitive adhesiveness in a normal state, and specifically, a skin material described later is attached on the adhesive resin layer. When a laminated sheet with a skin material is not particularly limited as long as it does not impair the good feel of the laminated sheet, for example, ethylene-ethyl acrylate-maleic anhydride copolymer, ethylene -Ethyl acrylate copolymer, ethylene-vinyl acetate copolymer and the like, among which ethylene-ethyl acrylate-maleic anhydride copolymer is preferable. Means for laminating the adhesive resin layer on the slice surface of the crosslinked closed-cell foam sheet is not particularly limited, and an extrusion lamination method may be used, or a heat lamination method may be used. Good.

【0026】上記接着性樹脂層の厚さは、薄くなると接
着性が低下し、厚くなるとコストが増すので、20〜1
00μmが好ましく、より好ましくは30〜60μmで
ある。
When the thickness of the adhesive resin layer is reduced, the adhesiveness is reduced, and when the thickness is increased, the cost is increased.
It is preferably 00 μm, more preferably 30 to 60 μm.

【0027】上記スライスされたシートのスライス面に
接着性樹脂層が積層された積層シートの接着性樹脂層
に、表皮材が貼着されて用いられてもよい。上記表皮材
は、特に限定されるものではないが、例えば、天然もし
くは人造繊維を編織した布帛或いは不織布、塩化ビニル
系樹脂シート、ポリ塩化ビニル樹脂にアクリロニトリル
−ブタジエン−スチレン(ABS)共重合体を配合した
樹脂組成物からなるシート、熱可塑性エラストマーシー
ト、レザーその他が挙げられる。
A skin material may be adhered to an adhesive resin layer of a laminated sheet in which an adhesive resin layer is laminated on the sliced surface of the above-mentioned sliced sheet. Although the skin material is not particularly limited, for example, acrylonitrile-butadiene-styrene (ABS) copolymer is used for a fabric or nonwoven fabric woven from natural or artificial fibers, a vinyl chloride resin sheet, or a polyvinyl chloride resin. Examples include a sheet made of the compounded resin composition, a thermoplastic elastomer sheet, leather and the like.

【0028】本発明の積層シートは、叙上の如く構成さ
れているので、ポリプロピレン系樹脂に添加されている
ポリエチレン系樹脂が、主として常温圧縮に対するプッ
シュバック性(弾性回復性)を高め、得られる架橋独立
気泡型発泡体シートに、耐熱性と良好な触感を与え、
又、接着性樹脂層に接する架橋独立気泡型発泡体シート
のスライス面は、高い嵩密度部分が切除されているの
で、更に、良好な触感と柔軟性を有するものであり、反
対面は、高い嵩密度部分からなるものであるので、積層
シート自体としては、真空成形やスタンピング成形等の
成形加工に必要な耐熱性と高い成形性をより十分に保持
するものである。
Since the laminated sheet of the present invention is constituted as described above, the polyethylene-based resin added to the polypropylene-based resin is mainly obtained by improving the push-back property (elastic recovery property) against room temperature compression. Gives heat resistance and good feel to the cross-linked closed cell foam sheet,
In addition, since the sliced surface of the crosslinked closed-cell foam sheet in contact with the adhesive resin layer has a high bulk density portion cut out, the sliced surface further has a good touch and flexibility, and the opposite surface is high. Since it is composed of a bulk density portion, the laminated sheet itself sufficiently retains the heat resistance and high moldability required for molding such as vacuum molding and stamping.

【0029】更に、架橋独立気泡型発泡体シートのスラ
イス面は、接着性樹脂層が上記スライス面の微細な凹凸
にしっかりと充填され該面に強固に投錨され高い接着性
を示すものであるので、該接着性樹脂層上に貼付される
表皮材を美麗に貼付仕上げでき、且つ、使用時の良好な
触感を賦与するものである。
Further, the sliced surface of the cross-linked closed-cell foamed sheet has high adhesiveness because the adhesive resin layer is firmly filled in the fine irregularities on the sliced surface and is firmly anchored on the surface. The surface material to be stuck on the adhesive resin layer can be beautifully stuck and finished, and gives a good tactile sensation during use.

【0030】[0030]

【発明の実施の形態】以下、本発明の実施例について説
明するが、本発明は、これらの実施例に限定されるもの
ではない。
DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described, but the present invention is not limited to these embodiments.

【0031】(実施例1)ポリプロピレン系樹脂(MF
R=1.8g/10分、エチレン含有量4.8重量%の
プロピレン−エチレンランダム共重合体、表1中、PP
(1)と略称する。)80重量部、ポリエチレン系樹脂
(MFR=4.0g/10分、密度0.920g/cm
3 の線状低密度ポリエチレン、表1中、PE(1)と略
称する。)20重量部、熱分解型発泡剤(アゾジカルボ
ンアミド)10重量部及び架橋助剤(1,10−デカン
ジオールジメタクリレート)3.5重量部を混合し、T
ダイ法押出成形機を用いて上記熱分解型発泡剤の分解温
度以下の押出条件で押出し、厚さ2.2mmの発泡性粗
シートを得た。
Example 1 Polypropylene resin (MF)
R = 1.8 g / 10 min, propylene-ethylene random copolymer having an ethylene content of 4.8% by weight;
Abbreviated as (1). ) 80 parts by weight, polyethylene resin (MFR = 4.0 g / 10 min, density 0.920 g / cm)
3 linear low-density polyethylene, abbreviated as PE (1) in Table 1. ) 20 parts by weight, 10 parts by weight of a thermal decomposition type foaming agent (azodicarbonamide) and 3.5 parts by weight of a crosslinking aid (1,10-decanediol dimethacrylate),
It was extruded using a die extrusion molding machine under extrusion conditions at or below the decomposition temperature of the pyrolytic foaming agent to obtain a 2.2 mm thick foamable coarse sheet.

【0032】得られた発泡性粗シートの両面から電子線
(600KV)を併せて4.0Mrad照射して上記ポ
リプロピレン系樹脂及びポリエチレン系樹脂を架橋し、
発泡性シートを得た。次いで、上記発泡性シートを26
0℃の熱風式発泡炉内で加熱発泡させて、架橋独立気泡
型発泡体シートとした。得られた架橋独立気泡型発泡体
シートは、厚さ5.2mm、嵩密度0.05g/cc、
120℃のキシレン中で24時間浸漬して測定したゲル
分率59%であった。
The polypropylene resin and the polyethylene resin were cross-linked by irradiating 4.0 Mrad together with an electron beam (600 KV) from both sides of the obtained foamable coarse sheet,
A foamable sheet was obtained. Next, the foamable sheet was
The foam was heated and foamed in a hot-air foaming furnace at 0 ° C. to obtain a cross-linked closed-cell foam sheet. The obtained cross-linked closed cell foam sheet had a thickness of 5.2 mm, a bulk density of 0.05 g / cc,
The gel fraction measured by immersion in xylene at 120 ° C. for 24 hours was 59%.

【0033】上記架橋独立気泡型発泡体シートを、厚さ
が元の1/2の2.6mmとなるようにスライスした。
スライスされた架橋独立気泡型発泡体シートの嵩密度
は、スライス面0.042g/cc、表皮面0.067
g/cc(いずれも表面より0.5mm内側の試料で測
定)であった。
The above cross-linked closed cell foam sheet was sliced so that the thickness became 1 / of the original thickness, that is, 2.6 mm.
The bulk density of the sliced cross-linked closed cell foam sheet was 0.042 g / cc on the sliced surface and 0.067 g on the skin surface.
g / cc (measured with a sample 0.5 mm inside from the surface).

【0034】上記架橋独立気泡型発泡体シートのスライ
ス面に、接着性樹脂(住友化学社製、商品名「L−41
10」、エチレン−アクリル酸エチル−無水マレイン酸
共重合体、MFR=5g/10分)を厚さ0.05mm
となるように押出ラミネートして積層シートを作製し
た。
An adhesive resin (trade name “L-41” manufactured by Sumitomo Chemical Co., Ltd.) is applied to the slice surface of the crosslinked closed-cell foam sheet.
10 ", ethylene-ethyl acrylate-maleic anhydride copolymer, MFR = 5 g / 10 min) with a thickness of 0.05 mm
The laminated sheet was produced by extrusion lamination such that

【0035】(実施例2)実施例1のポリプロピレン系
樹脂及びポリエチレン系樹脂に替えて、ポリプロピレン
系樹脂(MFR=2.8g/10分、エチレン含有量
3.4重量%のプロピレン−エチレンランダム共重合
体、表1中、PP(2)と略称する。)80重量部、ポ
リエチレン系樹脂(MFR=2.6g/10分、密度
0.920g/cm3 の線状低密度ポリエチレン、表1
中、PE(2)と略称する。)20重量部を用いたこと
以外、実施例1と同様にして厚さ2.0mmの発泡性粗
シートを得た。
Example 2 Instead of the polypropylene resin and the polyethylene resin of Example 1, a polypropylene resin (MFR = 2.8 g / 10 min, ethylene content 3.4 wt% propylene-ethylene random copolymer) was used. Polymer, 80 parts by weight of PP (2) in Table 1), polyethylene-based resin (MFR = 2.6 g / 10 min, linear low-density polyethylene having a density of 0.920 g / cm 3 ), Table 1
Medium, abbreviated as PE (2). ) A foamable coarse sheet having a thickness of 2.0 mm was obtained in the same manner as in Example 1 except that 20 parts by weight was used.

【0036】得られた発泡性粗シートに、実施例1と同
様に電子線照射し、熱風式発泡炉内で加熱発泡させて、
架橋独立気泡型発泡体シートとした。得られた架橋独立
気泡型発泡体シートは、厚さ5.0mm、嵩密度0.0
5g/cc、120℃のキシレン中で24時間浸漬して
測定したゲル分率60%であった。
The obtained foamable rough sheet was irradiated with an electron beam in the same manner as in Example 1, and heated and foamed in a hot-air foaming furnace.
A crosslinked closed cell foam sheet was obtained. The obtained cross-linked closed cell foam sheet has a thickness of 5.0 mm and a bulk density of 0.0
The gel fraction was 60% as measured by immersion in xylene at 120 g at 5 g / cc for 24 hours.

【0037】上記架橋独立気泡型発泡体シートを、厚さ
が元の1/2の2.5mmとなるようにスライスした。
スライスされた架橋独立気泡型発泡体シートの嵩密度
は、スライス面0.042g/cc、表皮面0.067
g/cc(いずれも表面より0.5mm内側の試料で測
定)であった。
The above-mentioned cross-linked closed cell foam sheet was sliced so that the thickness became 1/2 of the original thickness of 2.5 mm.
The bulk density of the sliced cross-linked closed cell foam sheet was 0.042 g / cc on the sliced surface and 0.067 g on the skin surface.
g / cc (measured with a sample 0.5 mm inside from the surface).

【0038】上記架橋独立気泡型発泡体シートのスライ
ス面に、接着性樹脂(住友化学社製、商品名「L−41
10」、エチレン−アクリル酸エチル−無水マレイン酸
共重合体、MFR=5g/10分)を厚さ0.05mm
となるように押出ラミネートして積層シートを作製し
た。
An adhesive resin (trade name “L-41” manufactured by Sumitomo Chemical Co., Ltd.) is provided on the sliced surface of the crosslinked closed-cell foam sheet.
10 ", ethylene-ethyl acrylate-maleic anhydride copolymer, MFR = 5 g / 10 min) with a thickness of 0.05 mm
The laminated sheet was produced by extrusion lamination such that

【0039】(比較例1〜3)実施例1の架橋独立気泡
型発泡体シートの厚さ、嵩密度及び120℃のキシレン
中で24時間浸漬して測定したゲル分率を各々、表1に
示す値に変更し、スライスすることなく、そのまま接着
樹脂層を積層したこと以外、実施例1と同様にして積層
シートを作製した。
Comparative Examples 1 to 3 Table 1 shows the thickness, bulk density and gel fraction of the crosslinked closed cell foam sheet of Example 1 measured by immersion in xylene at 120 ° C. for 24 hours. A laminated sheet was produced in the same manner as in Example 1 except that the values were changed to the values shown and the adhesive resin layer was laminated as it was without slicing.

【0040】(比較例4)実施例2の架橋独立気泡型発
泡体シートをスライスした後、接着樹脂層に替えて、2
液型ウレタン系接着剤を用いたこと以外、実施例2と同
様にして積層シートを作製した。
(Comparative Example 4) After slicing the cross-linked closed-cell foam sheet of Example 2, 2
A laminated sheet was produced in the same manner as in Example 2 except that a liquid urethane-based adhesive was used.

【0041】上記実施例及び比較例で得られた積層シー
トの性能を評価するため、表皮材貼付性、真空成形性、
スタンピング成形性、触感及び指圧について、以下に示
す方法で試験した。試験結果は表1に示す。
In order to evaluate the performance of the laminated sheets obtained in the above Examples and Comparative Examples, the adhesion of the skin material, the vacuum moldability,
The stamping moldability, tactile sensation and finger pressure were tested by the following methods. The test results are shown in Table 1.

【0042】1.表皮材貼付性:積層シートの接着性樹
脂層に、厚さ0.5mmの軟質塩化ビニル樹脂シートか
らなる表皮材を圧着して貼付し、表皮材の貼付面の凹凸
(アバタ現象)の有無を試料数5で目視により観察し、
○:5点共無し、×:あり、の2段階で評価した。
1. Skin material sticking property: A skin material made of a soft vinyl chloride resin sheet having a thickness of 0.5 mm is pressure-bonded to the adhesive resin layer of the laminated sheet, and the presence or absence of irregularities (abata phenomenon) on the surface to which the skin material is stuck is determined. Visually observe with 5 samples,
:: No evaluation for 5 points, ×: Evaluation for 2 points.

【0043】2.真空成形性:前項の表皮材貼付性試験
で得られた表皮材付き積層シートを試料数5で、直径1
00mm、深さ40mmの凹型カップ状型窩を有する金
型を用い、表皮材が金型側に当接するようにして、表皮
材付き積層シート表面が120℃になるように加熱して
真空成形を行い、真空成形性試験を行った。評価は、
○:5点共裂け、破れ等の欠点無し、×:裂け、破れあ
り、の2段階で行った。
2. Vacuum formability: The laminated sheet with the skin material obtained in the skin material sticking property test described in the preceding section was a sample number of 5 and a diameter of 1
Using a mold having a concave cup-shaped cavity with a depth of 00 mm and a depth of 40 mm, the skin material is brought into contact with the mold side, and the surface of the laminated sheet with the skin material is heated to 120 ° C. to perform vacuum forming. Then, a vacuum formability test was performed. Evaluation,
:: No defects such as tearing and tearing at 5 points, ×: Tearing and tearing were performed in two stages.

【0044】3.スタンピング成形性:前項の真空成形
性試験で得られた破れ等の欠点のない真空成形品に、溶
融した210℃のポリプロピレン樹脂からなる骨材を内
面に供給し、60kgf/cm 2 の圧力で凸型を型押し
てスタンピング成形性試験を行った。評価は、○:5点
共裂け、破れ等の欠点無し、×:裂け、破れあり、の2
段階で行った。
3. Stamping formability: vacuum forming as described in the previous section
Into a vacuum-formed product that has no defects such as tears
Aggregate made of molten 210 ° C polypropylene resin
60kgf / cm TwoPressing the convex with pressure
A stamping moldability test was performed. Evaluation: ○: 5 points
No defects such as co-tearing and tearing, ×: tearing and tearing, 2
Performed in stages.

【0045】4.触感評価:上記実施例及び比較例の架
橋独立気泡型発泡体シートの接着樹脂層積層面(実施例
1〜2及び比較例4はスライス面)及び前第2及び3項
の真空成形性試験、スタンピング成形性試験で得られた
標本を、対照として、嵩密度0.045g/ccのポリ
プロピレン樹脂架橋独立気泡型発泡体シートの表皮面及
び上記実施例及び比較例と同様に真空成形性試験、スタ
ンピング成形性試験を行って得られた標本と比較し、こ
れらを総合して、○:対照標本より良好な触感を与える
もの、△:対照標本と同等程度の触感を与えるもの、
×:対照標本より触感の悪いもの、の3段階で評価し
た。
4. Tactile evaluation: the adhesive resin layer laminated surface of the crosslinked closed-cell foam sheet of the above Examples and Comparative Examples (slice surfaces in Examples 1 and 2 and Comparative Example 4) and the vacuum moldability tests of the preceding 2nd and 3rd paragraphs, As a control, the specimen obtained in the stamping moldability test was used as a control, and the vacuum moldability test and stamping were performed in the same manner as in the above Examples and Comparative Examples, as well as the skin surface of a polypropylene resin crosslinked closed cell foam sheet having a bulk density of 0.045 g / cc. The specimens obtained by performing the moldability test were compared with each other, and the specimens were combined. ○: A specimen which gives a better tactile sensation than the control specimen, Δ: A specimen which gave a similar tactile sensation to the control specimen,
X: Evaluation was made on a three-point scale, which was worse in touch than the control sample.

【0046】5.指圧評価:前第4項で試験された真空
成形及びスタンピング成形された標本及び対照標本につ
いて、指圧で深さが1.5mm凹むように押圧し、10
秒間この状態に置き、指圧を除いたとき、○:即座に弾
性回復したもの、△:24時間以内に回復したもの、
×:指圧でできた凹みが回復しなかったもの、の3段階
で評価した。
5. Shiatsu pressure evaluation: For the vacuum-formed and stamped-molded sample and the control sample tested in the preceding paragraph 4, the finger was pressed to a depth of 1.5 mm, and 10
When placed in this state for 2 seconds and the acupressure was removed, ○: immediately recovered elasticity, Δ: recovered within 24 hours,
X: The dents formed by the acupressure were not recovered, and were evaluated in three stages.

【0047】[0047]

【表1】 [Table 1]

【0048】[0048]

【発明の効果】本発明の積層シートは、叙上の如く構成
されているので、真空成形やスタンピング成形性時の高
い耐熱性と成形性を有し、良好な生産性で成形加工がで
き、且つ、得られる成形加工品は、常温圧縮性能と良好
な触感を有するものである。更に、接着性樹脂層を強固
に投錨し、高い接着性を示すものであるので、該接着性
樹脂層上に貼付される表皮材を美麗に貼付仕上げでき、
且つ、低コストで使用時の良好な触感と柔軟性を賦与す
るものである。
Since the laminated sheet of the present invention is constituted as described above, it has high heat resistance and formability during vacuum forming and stamping formability, and can be formed with good productivity. Moreover, the obtained molded product has room temperature compression performance and a good tactile sensation. Furthermore, since the adhesive resin layer is firmly anchored and exhibits high adhesiveness, the skin material applied on the adhesive resin layer can be beautifully attached and finished.
In addition, it provides good tactile sensation and flexibility during use at low cost.

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 ポリプロピレン系樹脂40〜90重量%
とポリエチレン系樹脂60〜10重量%からなり、ゲル
分率が20〜70%である架橋独立気泡型発泡体シート
をスライスして得られたシートのスライス面に、接着性
樹脂層が積層されてなることを特徴とする積層シート。
1 to 40% by weight of a polypropylene resin
An adhesive resin layer is laminated on a sliced surface of a sheet obtained by slicing a cross-linked closed cell foam sheet having a gel fraction of 20 to 70%, comprising 60 to 10% by weight of a polyethylene resin. A laminated sheet, comprising:
JP17579597A 1997-07-01 1997-07-01 Laminated sheet Expired - Fee Related JP3396400B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17579597A JP3396400B2 (en) 1997-07-01 1997-07-01 Laminated sheet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17579597A JP3396400B2 (en) 1997-07-01 1997-07-01 Laminated sheet

Publications (2)

Publication Number Publication Date
JPH1120061A true JPH1120061A (en) 1999-01-26
JP3396400B2 JP3396400B2 (en) 2003-04-14

Family

ID=16002392

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17579597A Expired - Fee Related JP3396400B2 (en) 1997-07-01 1997-07-01 Laminated sheet

Country Status (1)

Country Link
JP (1) JP3396400B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1752485A1 (en) * 2005-08-08 2007-02-14 Alveo AG Soft polyolefin foams with high heat resistance
JP2010513053A (en) * 2006-12-16 2010-04-30 ベネツケ−カリコ・アーゲー Thermoplastic film with foam cover sheet
US9260577B2 (en) 2009-07-14 2016-02-16 Toray Plastics (America), Inc. Crosslinked polyolefin foam sheet with exceptional softness, haptics, moldability, thermal stability and shear strength

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1752485A1 (en) * 2005-08-08 2007-02-14 Alveo AG Soft polyolefin foams with high heat resistance
WO2007017250A1 (en) * 2005-08-08 2007-02-15 Sekisui Alveo Ag Soft polyolefin foams with high heat resistance
KR101166390B1 (en) 2005-08-08 2012-08-09 세키스이케미칼가부시키가이샤 Soft Polyolefin Foams With High Heat Resistance
JP2010513053A (en) * 2006-12-16 2010-04-30 ベネツケ−カリコ・アーゲー Thermoplastic film with foam cover sheet
US9260577B2 (en) 2009-07-14 2016-02-16 Toray Plastics (America), Inc. Crosslinked polyolefin foam sheet with exceptional softness, haptics, moldability, thermal stability and shear strength
US10301447B2 (en) 2009-07-14 2019-05-28 Toray Plastics (America), Inc. Crosslinked polyolefin foam sheet with exceptional softness, haptics, moldability, thermal stability and shear strength

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