JPS6116128Y2 - - Google Patents
Info
- Publication number
- JPS6116128Y2 JPS6116128Y2 JP1980087611U JP8761180U JPS6116128Y2 JP S6116128 Y2 JPS6116128 Y2 JP S6116128Y2 JP 1980087611 U JP1980087611 U JP 1980087611U JP 8761180 U JP8761180 U JP 8761180U JP S6116128 Y2 JPS6116128 Y2 JP S6116128Y2
- Authority
- JP
- Japan
- Prior art keywords
- silicone
- sheet
- polystyrene
- thermoforming
- 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.)
- Expired
Links
- 229920001296 polysiloxane Polymers 0.000 claims description 15
- 238000003856 thermoforming Methods 0.000 claims description 11
- 239000004793 Polystyrene Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 9
- 229920002223 polystyrene Polymers 0.000 claims description 9
- 229920000098 polyolefin Polymers 0.000 claims description 6
- 239000010410 layer Substances 0.000 description 13
- 229920005989 resin Polymers 0.000 description 11
- 239000011347 resin Substances 0.000 description 11
- 238000000034 method Methods 0.000 description 3
- 229920002545 silicone oil Polymers 0.000 description 3
- 238000000576 coating method Methods 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
- 239000006082 mold release agent Substances 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- 238000007666 vacuum forming Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 229920005669 high impact polystyrene Polymers 0.000 description 1
- 239000004797 high-impact polystyrene Substances 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Laminated Bodies (AREA)
Description
【考案の詳細な説明】
本考案は真空成形、圧空成形等の熱成形の材料
となる熱可塑性合成樹脂シートに関するものであ
る。
ポリスチレン、ポリオレフイン等の熱可塑性合
成樹脂のシートを熱成形する場合、シートの型離
れを良くし、また得られた成形物相互の接着を防
ぐために、あらかじめシート表面にシリコーンエ
マルジヨン等の離型剤を塗布するのが普通であ
る。ところがこの前処理には、
塗布斑が生じ易い。
乾燥不良によるトラブルが起き易い。
処理装置周辺の環境を悪化させる。
処理後長期間経過すると、離型剤が脱落して
処理効果の減退又は斑を生じ易い。
塗布時、シート表面に傷を生じ易い。
など多くの欠点がある。
本考案はこのような欠点の多い離型剤塗布法に
よらずに離型性を付与した熱成形材料、すなわち
共押出法により積層された離型性シリコーン含有
層を表面に有するポリスチレンもしくはポリオレ
フインシートを提供するものである。
第１図は本考案による熱成形材料の断面図であ
つて、１が離型性シリコーン含有層、２はシリコ
ーンを含有しない樹脂層である。後者はポリスチ
レンもしくはポリオレフインからなり、その厚さ
は、通常の熱成形材料同様、0.05〜1.0mm程度で
ある。
本考案による熱成形材料の特徴であるシリコー
ン含有層１は、好ましくは70μ以下の、ポリスチ
レンもしくはポリオレフインからなる薄層であつ
て、この中に離型性シリコーン油が均一に含まれ
ている。シリコーン含有量は、この層の基材樹脂
の重量に対して0.01〜２％が適当である。基材樹
脂は樹脂層２の樹脂と同じものでよいが、層間剥
離を起こす恐れのない範囲で、他の樹脂を用いて
もよい。
本考案による熱成形材料を製造するには、シリ
コーンを均一に付着させたシリコーン含有層用樹
脂ベレツトを、シリコーンを含有させない樹脂層
用の原料樹脂と共に、共押出法により積層シート
として押出成形する。各層を押出後に接着させた
のでは、シリコーンのために、安定な積層構造が
得られない。
本考案による熱成形材料は上述のような構成に
基づき、基材樹脂シートが本来有する物性や成形
性を保持しながら、すぐれた離型性を、斑なく、
長期間にわたつて安定して示す。そして既に確立
された技術である共押出法によつて容易に、且つ
衛生的に、製造することができる安価なものであ
るから、熱成形における能率と品質向上に貢献す
るところ大なものである。
実施例
シリコーンオイル（信越化学社製・KF96）を
0.5％付着させたハイインパクトポリスチレン
（出光石油化学社製・ET−60）を同じポリスチレ
ン（シリコーンオイルを付着させないもの）と温
度230℃で共押出しし、全厚み650μ、シリコーン
含有層の厚み30μのシートを得た。
別に、比較のためポリスチレン単体シート（厚
み650μ、上記ポリスチレンを使用）を製造し、
シリコーンエマルジヨン（東レ社製品・SH−
7024の10倍水稀釈品）を塗布後乾燥した。
これらのシートを真空成形法により深さ15cmの
コツプに成形した。またシート製造後３ケ月経過
してからも、同様の成形を行なつた。このときの
成形物の外観及び離型性は次のとおりであつた。
【表】[Detailed Description of the Invention] The present invention relates to a thermoplastic synthetic resin sheet that can be used as a material for thermoforming such as vacuum forming and pressure forming. When thermoforming a sheet of thermoplastic synthetic resin such as polystyrene or polyolefin, a release agent such as silicone emulsion is applied to the surface of the sheet in advance in order to improve the release of the sheet from the mold and to prevent the resulting molded products from adhering to each other. It is common to apply . However, this pretreatment tends to cause coating spots. Problems are likely to occur due to insufficient drying. Deteriorates the environment around the processing equipment. If a long period of time passes after treatment, the mold release agent will fall off, which tends to reduce the treatment effect or cause spots. During application, it is easy to cause scratches on the sheet surface. There are many drawbacks such as The present invention is a thermoforming material that imparts mold releasability without using the mold release agent coating method, which has many drawbacks, i.e., a polystyrene or polyolefin sheet having a mold release silicone-containing layer laminated by a coextrusion method on its surface. It provides: FIG. 1 is a cross-sectional view of the thermoforming material according to the present invention, in which 1 is a layer containing releasable silicone, and 2 is a resin layer not containing silicone. The latter is made of polystyrene or polyolefin, and its thickness is about 0.05 to 1.0 mm, similar to ordinary thermoforming materials. The silicone-containing layer 1, which is a feature of the thermoforming material according to the present invention, is a thin layer of polystyrene or polyolefin, preferably 70 μm or less, in which a mold-releasing silicone oil is uniformly contained. The silicone content is suitably 0.01 to 2% based on the weight of the base resin of this layer. The base resin may be the same as the resin for the resin layer 2, but other resins may be used as long as there is no risk of interlayer peeling. To produce the thermoforming material according to the present invention, a resin beret for a silicone-containing layer to which silicone is evenly adhered is extruded into a laminated sheet by coextrusion together with a raw material resin for a resin layer that does not contain silicone. If each layer is adhered after extrusion, a stable laminated structure cannot be obtained because of the silicone. The thermoforming material according to the present invention is based on the above-mentioned structure, and maintains the physical properties and moldability inherent to the base resin sheet, while exhibiting excellent mold releasability without unevenness.
Demonstrates stability over a long period of time. Furthermore, since it is an inexpensive product that can be easily and hygienically manufactured using the already established coextrusion method, it will greatly contribute to improving efficiency and quality in thermoforming. . Example Silicone oil (manufactured by Shin-Etsu Chemical Co., Ltd., KF96)
High-impact polystyrene (manufactured by Idemitsu Petrochemical Co., Ltd., ET-60) with 0.5% adhesion was coextruded with the same polystyrene (without silicone oil) at a temperature of 230℃, with a total thickness of 650μ and a silicone-containing layer thickness of 30μ. Got a sheet. Separately, for comparison, a single polystyrene sheet (650μ thick, using the above polystyrene) was manufactured.
Silicone emulsion (Toray product/SH-
7024 (10 times diluted with water) was applied and dried. These sheets were formed into a pot with a depth of 15 cm using a vacuum forming method. Further, the same molding was performed even after 3 months had passed since the sheet was manufactured. The appearance and mold releasability of the molded product at this time were as follows. 【table】
第１図は本考案による熱成形材料の断面図であ
る。
１：離型性シリコーン含有層、２：シリコーン
を含有しない樹脂層。
FIG. 1 is a cross-sectional view of a thermoforming material according to the present invention. 1: releasable silicone-containing layer, 2: resin layer not containing silicone.
Claims (1)
リスチレンもしくはポリオレフインより共押出法
により積層された薄層を表面に有することを特徴
とするポリスチレンもしくはポリオレフインのシ
ートからなる熱成形材料。 1. A thermoforming material comprising a sheet of polystyrene or polyolefin, which has on its surface a thin layer laminated by coextrusion from polystyrene or polyolefin containing 0.01 to 2% by weight of releasable silicone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1980087611U JPS6116128Y2 (en) | 1980-06-24 | 1980-06-24 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1980087611U JPS6116128Y2 (en) | 1980-06-24 | 1980-06-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5711034U JPS5711034U (en) | 1982-01-20 |
| JPS6116128Y2 true JPS6116128Y2 (en) | 1986-05-19 |
Family
ID=29449726
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1980087611U Expired JPS6116128Y2 (en) | 1980-06-24 | 1980-06-24 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6116128Y2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6183037A (en) * | 1984-09-28 | 1986-04-26 | 五洋紙工株式会社 | Manufacture of laminated sheet and manufacture of cup |
| CA1321865C (en) * | 1988-01-27 | 1993-09-07 | H. Wayne Swofford | Substantially wrinkle-free, high modulus of elasticity, non-planar film and process for its manufacture |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50144466U (en) * | 1974-05-16 | 1975-11-28 |
-
1980
- 1980-06-24 JP JP1980087611U patent/JPS6116128Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5711034U (en) | 1982-01-20 |
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