JPS6334137A - Multilayer sheet - Google Patents
Multilayer sheetInfo
- Publication number
- JPS6334137A JPS6334137A JP17835086A JP17835086A JPS6334137A JP S6334137 A JPS6334137 A JP S6334137A JP 17835086 A JP17835086 A JP 17835086A JP 17835086 A JP17835086 A JP 17835086A JP S6334137 A JPS6334137 A JP S6334137A
- Authority
- JP
- Japan
- Prior art keywords
- sheet
- layer
- multilayer sheet
- present
- gloss
- 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
Links
- 229920001903 high density polyethylene Polymers 0.000 claims description 8
- 239000004700 high-density polyethylene Substances 0.000 claims description 8
- 229920001684 low density polyethylene Polymers 0.000 claims description 7
- 239000004702 low-density polyethylene Substances 0.000 claims description 7
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 6
- 239000005977 Ethylene Substances 0.000 claims 1
- 229920001577 copolymer Polymers 0.000 claims 1
- 239000010410 layer Substances 0.000 description 13
- 238000000034 method Methods 0.000 description 8
- 239000005038 ethylene vinyl acetate Substances 0.000 description 5
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 5
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 238000007666 vacuum forming Methods 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 229920006038 crystalline resin Polymers 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229920000092 linear low density polyethylene Polymers 0.000 description 1
- 239000004707 linear low-density polyethylene Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、剛性があり且つ表面光沢の優れた成形品の製
造に適し、例えば搬送用部品、容器等外観の平滑性、光
沢の良いことを要求される成形品に用いることかできる
多層シートに関する。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is suitable for manufacturing molded products that are rigid and have excellent surface gloss, such as transportation parts, containers, etc., which require good appearance smoothness and gloss. The present invention relates to a multilayer sheet that can be used for molded products.
従来の技術
従来、高密度ポリエチレン（以下「ＨＤ Ｐ Ｅｌと略
称する）製のシートは、その耐衝撃性、剛性、耐薬品性
等を生かして真空成形品での用途があった。しかし、）
（ＤＰＥは、高結晶性樹脂であり、優れた耐衝撃性を要
求される場合には高分子量のものが用いられている。し
たがって、押出成形時には、所謂メルトフラクチャーー
歩手前の状態になりやすく、また、押出後冷却過程でも
結晶化により肌荒れを発生しやすい。これがため、真空
成形し°Ｃもそのまま肌荒れが残ったり、弾性回復によ
り肌荒れか出たりひどくなったりするため、得られた成
形品は外観上の点で好ましいものではない。Conventional technology Conventionally, sheets made of high-density polyethylene (hereinafter abbreviated as "HD P El") have been used in vacuum-formed products due to their impact resistance, rigidity, chemical resistance, etc.
(DPE is a highly crystalline resin, and a high molecular weight one is used when excellent impact resistance is required. Therefore, during extrusion molding, it tends to be on the verge of so-called melt fracture. In addition, even during the cooling process after extrusion, rough skin tends to occur due to crystallization.For this reason, even after vacuum forming at °C, the rough skin remains as it is, and the rough skin may appear or worsen due to elastic recovery, so the molded product obtained is not desirable in terms of appearance.
発明が解決しようとする問題点
この様な外観不良は、ＨＤＰｇの改質では無くすことは
できず、やはりＨＤＰＥが金型に直接触れない様にする
ことが最も良い方法である。Problems to be Solved by the Invention Such appearance defects cannot be eliminated by modifying HDPg, and the best way is to prevent HDPE from coming into direct contact with the mold.
本発明は、所謂メルトフラクチャー現象を無くし、ＨＤ
ＰＥを用いながら外観の良好な真空成形品を得られる多
層シートを提供するものである。The present invention eliminates the so-called melt fracture phenomenon and improves HD
The present invention provides a multilayer sheet that allows vacuum-formed products with good appearance to be obtained while using PE.
問題点を解決するための手段
即ら、本発明は、第一層と第三層が低密度ポリエチレン
（以下ｒＬＤＰｇＪという）またはエチレン−酢酸ビニ
ル共重合体（以下ｒｇｖＡ４という）であり、中間層で
ある第二層がＨＤＰＥであり、前記三層が一体化されて
いる多層シートである。Means for solving the problem, the present invention provides that the first layer and the third layer are made of low density polyethylene (hereinafter referred to as rLDPgJ) or ethylene-vinyl acetate copolymer (hereinafter referred to as rgvA4), and the middle layer is It is a multilayer sheet in which one second layer is HDPE and the three layers are integrated.
作用
本発明は、表面にＬＤＰｇまたはＥＶＡを配置している
ので、この三層シートを製造する場合金型内での流動性
か良く、所謂メルトフラクチャーを発生しないので１表
面外観が平滑で高光沢のシートが得られる。また、ＬＤ
Ｐｇ、ＥＶＡは高光沢の樹脂であり、真空成形後におい
ても、この高沢を保つことができる。Function: Since LDPg or EVA is placed on the surface of the present invention, when manufacturing this three-layer sheet, the fluidity in the mold is good and so-called melt fracture does not occur, so the surface appearance is smooth and high gloss. sheets are obtained. Also, L.D.
Pg and EVA are resins with high gloss, and can maintain this high gloss even after vacuum forming.
本発明の多層シートの構成としては、ｇＶＡ／）（ＤＰ
Ｅ／ｇＶＡ％ＬＤＰＥ／）（ＤＰＥ／ＬＤＰｇ−ｇＶＡ
／ｌ（ＤＰｇ／ＬＤＰＥ等テアル。The structure of the multilayer sheet of the present invention is gVA/)(DP
E/gVA%LDPE/)(DPE/LDPg-gVA
/l (DPg/LDPE etc.)
ＥＶＡ／ＨＤＰｇ、ＬＤＰＥ／ＨＤＰＥも考ｔられるが
、成形収縮が異なるため、カール、反りが出やすく、本
発明の様に三層構成とすることが必要である。EVA/HDPg and LDPE/HDPE are also considered, but since they have different molding shrinkage, curling and warping are likely to occur, so it is necessary to have a three-layer structure as in the present invention.
この様な構成のシートを製造する方法としては、マルチ
マニホールドダイを用いる方法あるいはフィードブロッ
クを用い多層化し通常のＴダイを用いて押出す方法等を
用いることが可能である。As a method for manufacturing a sheet having such a structure, it is possible to use a method using a multi-manifold die, a method in which multilayers are formed using a feed block, and a method is extruded using an ordinary T-die.
実施例
本発明で用いることのできるＬＤＰＥは、所謂高圧法Ｌ
ＤＰＥ、低圧法ＬＤＰｇ （通常ＬＬＤＰＥといわれＣ
いる）である。また、ｇＶＡとしては、酢酸ビニル成分
の少ないものの方が押出の際冷却ロールに粘着しにくく
良好であるが、酢酸ビニル成分の多いものでも、水冷ロ
ールで製造可能である。ＥＶＡは、スリップしにくい特
性が、Ｆ）す、この特性が要求される場合はメルトイン
デックスＭＩ−１，５のＬＤＰＩｌｉｉとＭＩ＝０．５
のＨＤＰＥを用いてＬＤＰＥ／ＨＤＰｇ／ＬＤＰｇ−０
，１鳩／ １．８ ｍ ／ Ｏ，ｌ鴎の層構成の三層シ
ートをフィードブロック法共押出にて作製した。該シー
トの特性を第１表に示す。Example LDPE that can be used in the present invention is manufactured using the so-called high pressure method L.
DPE, low pressure LDPg (usually called LLDPE)
There is). Furthermore, gVA with a lower vinyl acetate content is better because it is less likely to stick to a cooling roll during extrusion, but gVA with a large vinyl acetate content can also be produced using a water-cooled roll. EVA has the property of being hard to slip.F) If this property is required, LDPIlii with melt index MI-1,5 and MI = 0.5
LDPE/HDPg/LDPg-0 using HDPE of
A three-layer sheet with a layer structure of ., 1 dove/1.8 m/O, 1 seagull was produced by coextrusion using the feedblock method. The properties of the sheet are shown in Table 1.
比較例１
実施例１のＭＩＩＯ２５のＨＤＰｇの単層シートを通常
のＴダイで成形した。該シートの特性を第１表に示す。Comparative Example 1 The single-layer sheet of MIIO25 HDPg of Example 1 was molded using a normal T-die. The properties of the sheet are shown in Table 1.
実施例２
ン
Ｍｌ−２，３のｇＶＡ（酢酸ビニルコンテ■ト１０４）
と実施例１のＭｆ＝０．５のＨＤＰＥを用い一’ｃ、ｇ
ＶＡ／ＨＤＰＥ／ＩＥＶＡ−０，１ｍ／２、８ ｍ ／
０．１ ｍの層構成の三層シートをフィードブロック
法共押出にて作製した。該シートの特性を第１表に示す
。Example 2 gVA of Ml-2,3 (vinyl acetate content 104)
Using HDPE with Mf = 0.5 in Example 1, 1'c, g
VA/HDPE/IEVA-0,1m/2,8m/
A three-layer sheet with a layer structure of 0.1 m was produced by coextrusion using the feedblock method. The properties of the sheet are shown in Table 1.
注 光沢は、６０’−６０”のグロスを日本電色働製光
沢計にて測定した。平滑度は、小板■製５ｇ−３Ｇにて
ダイヤモンド触針で測定した。非スリツプ性は、４５°
の傾斜でシートの上に鉄片を置き、スリップして滑り落
ちるか否かで判定した。Note: Gloss was measured using a 60'-60" gloss meter made by Nippon Denshokudo. Smoothness was measured using a diamond stylus using 5g-3G made by Koita. Non-slip property was measured at 45 °
A piece of iron was placed on top of the seat at an inclination of 1, and the test was determined by whether it slipped or not.
発明の効果
本発明の三層シートは、従来のＨＤＰＷの単層シートに
比較して以下の効果が得られた。Effects of the Invention The three-layer sheet of the present invention had the following effects compared to the conventional single-layer HDPW sheet.
（１１シート、成形品の光沢が優れる。(Sheet 11, the gloss of the molded product is excellent.
（２） シートの平滑度が優れる。(2) Excellent sheet smoothness.
（３） 外観が良好である。(3) Appearance is good.
また、厚さ方向対称の層構成にすることによって、 （４） 反り、カールがない。In addition, by creating a layer structure that is symmetrical in the thickness direction, (4) No warping or curling.
Claims (1)
酢酸ビニル共重合体であり、中間層である第二層が高密
度ポリエチレンであり、前記三層が一体化されているこ
とを特徴とする多層シート。The first and third layers are low density polyethylene or ethylene.
1. A multilayer sheet comprising a vinyl acetate copolymer, a second intermediate layer comprising high-density polyethylene, and the three layers being integrated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17835086A JPS6334137A (en) | 1986-07-29 | 1986-07-29 | Multilayer sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17835086A JPS6334137A (en) | 1986-07-29 | 1986-07-29 | Multilayer sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6334137A true JPS6334137A (en) | 1988-02-13 |
Family
ID=16046953
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17835086A Pending JPS6334137A (en) | 1986-07-29 | 1986-07-29 | Multilayer sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6334137A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0322512A2 (en) * | 1987-12-31 | 1989-07-05 | Henkel Kommanditgesellschaft auf Aktien | Hollow plastics article with a lustrous outer surface |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51116883A (en) * | 1975-04-07 | 1976-10-14 | Nippon Petrochem Co Ltd | A process for manufacturing a multi-layer thermoplastic film |
| JPS5968351A (en) * | 1982-10-12 | 1984-04-18 | Idemitsu Kosan Co Ltd | Polyethylene resin composition and laminate thereof |
-
1986
- 1986-07-29 JP JP17835086A patent/JPS6334137A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51116883A (en) * | 1975-04-07 | 1976-10-14 | Nippon Petrochem Co Ltd | A process for manufacturing a multi-layer thermoplastic film |
| JPS5968351A (en) * | 1982-10-12 | 1984-04-18 | Idemitsu Kosan Co Ltd | Polyethylene resin composition and laminate thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0322512A2 (en) * | 1987-12-31 | 1989-07-05 | Henkel Kommanditgesellschaft auf Aktien | Hollow plastics article with a lustrous outer surface |
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