JP5765475B2 - 多色成形品の成形方法及び多色成形品 - Google Patents
多色成形品の成形方法及び多色成形品 Download PDFInfo
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- JP5765475B2 JP5765475B2 JP2014205707A JP2014205707A JP5765475B2 JP 5765475 B2 JP5765475 B2 JP 5765475B2 JP 2014205707 A JP2014205707 A JP 2014205707A JP 2014205707 A JP2014205707 A JP 2014205707A JP 5765475 B2 JP5765475 B2 JP 5765475B2
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- molded body
- cavity
- molding
- molded
- valve pin
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- ROORDVPLFPIABK-UHFFFAOYSA-N diphenyl carbonate Chemical compound C=1C=CC=CC=1OC(=O)OC1=CC=CC=C1 ROORDVPLFPIABK-UHFFFAOYSA-N 0.000 description 1
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- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
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Images
Landscapes
- Securing Of Glass Panes Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
なお、バルブピン16の温度調整は、バルブピン16の駆動装置20に冷却配管を配設し、駆動装置20を介して行うことが好ましい。この場合、冷却水の温度は0〜40℃であることが好ましく、5〜30℃がより好ましく、10〜20℃がさらに好ましい。
次に、本発明方法によって自動車用窓ガラス等を成形する場合に好適な材料について説明する。
強化用フィラーとしてガラス繊維等の強化用繊維を使用する場合は、強化用繊維の重量平均繊維長は、強度および分散性観点から、通常1.5〜10mm、好ましくは1.8〜5mmである。また、機械的強度、寸法精度、耐熱性を向上させるため、枠状部中の繊維の重量平均繊維長は通常0.1〜5mm、好ましくは0.2〜4mm、更に好ましくは0.3〜3mmである。枠状部中の繊維の重量平均繊維長を高く保つためには、射出成形機の射出シリンダーの構成が肝要で、特にスクリューの圧縮比を緩圧縮に、クリアランスを広く、チェックリングのクリアランスを広く取ることが効果的である。また、射出成形時の条件としては、樹脂温度の設定を高く、計量時の背圧を低く、射出速度を低く成形することが効果的である。
2 枠状部
2a 凹所
2b 肉薄部
2h 凹陥部
3 透明領域
4,4A パネル
11 可動型
11a,12a キャビティ
12 第2の固定型
13 ホットランナ
14 ゲート
14s シリンダボア部
14t バルブシート
15,15’ 凸部
16,16B,16C バルブピン
16a テーパ部
16b プランジャ部
17 マニホルード
18 ノズルタッチ部
19 ノズル
20 駆動装置
Claims (15)
- 第1の板面及びそれと反対側の第2の板面を有した第1の成形体と、
該第1の成形体の第2の板面の少なくとも一部に射出成形により該第1の成形体と一体に形成された第2の成形体とを有する多色成形品を成形する方法において、
前記第1の成形体を保持した可動型を、前記第2の成形体を成形するためのキャビティを有した固定型に型締めする工程と、
ホットランナを介して該固定型のゲートから該キャビティに合成樹脂材料を充填する工程と、
該キャビティ内の合成樹脂材料を該固定型のバルブピンで押圧して圧縮する圧縮工程と
を有する多色成形品の成形方法であって、
前記キャビティ内に前記合成樹脂材料を充填した後、前記圧縮工程において、前記バルブピンを該キャビティ内に突出させてキャビティ内のゲート付近の該合成樹脂材料を押圧し、前記第2の成形体に凹陥部を形成することを特徴とする多色成形品の成形方法。 - 前記凹陥部の深さt3と前記第2の成形体の厚さt2との比t3/t2が0.05〜0.5であることを特徴とする請求項1に記載の多色成形品の成形方法。
- 第1の板面及びそれと反対側の第2の板面を有した第1の成形体と、
該第1の成形体の第2の板面の少なくとも一部に射出成形により該第1の成形体と一体に形成された第2の成形体とを有する多色成形品を成形する方法において、
前記第1の成形体を保持した可動型を、前記第2の成形体を成形するためのキャビティを有した固定型に型締めする工程と、
ホットランナを介して該固定型のゲートから該キャビティに合成樹脂材料を充填する工程と、
該キャビティ内の合成樹脂材料を該固定型のバルブピンで押圧して圧縮する圧縮工程と
を有する多色成形品の成形方法であって、
前記ゲートに連なるランナ末端部にシリンダボア部が設けられ、前記バルブピンの先端側に、該シリンダボア部に内嵌するプランジャ部が設けられており、
前記キャビティに前記合成樹脂材料を充填した後、前記圧縮工程において、該バルブピンを前進させて該シリンダボア部内の合成樹脂材料を該キャビティ内に押し込み、さらに該バルブピンを前進させて該プランジャ部を前記キャビティ内に突出させてキャビティ内のゲート付近の該合成樹脂材料を押圧し、前記第2の成形体に凹陥部を形成することを特徴とする多色成形品の成形方法。 - 第1の板面及びそれと反対側の第2の板面を有した第1の成形体と、
該第1の成形体の第2の板面の少なくとも一部に射出成形により該第1の成形体と一体に形成された第2の成形体とを有する多色成形品を成形する方法において、
前記第1の成形体を保持した可動型を、前記第2の成形体を成形するためのキャビティを有した固定型に型締めする工程と、
ホットランナを介して該固定型のゲートから該キャビティに合成樹脂材料を充填する工程と、
該キャビティ内の合成樹脂材料を該固定型のバルブピンで押圧して圧縮する圧縮工程と
を有する多色成形品の成形方法であって、
前記ゲートに連なるランナ末端部にシリンダボア部が設けられ、前記バルブピンの先端側に、該シリンダボア部に内嵌するプランジャ部が設けられており、
該バルブピンが該シリンダボア部に内嵌していない状態で前記キャビティに前記合成樹脂材料を充填した後、前記圧縮工程において、該バルブピンを前進させて該バルブピンの該プランジャ部を該シリンダボア部に内嵌させ該シリンダボア部内の合成樹脂材料を該キャビティ内に押し込む方法であって、
該バルブピンを、該プランジャ部の先端面がその周囲のキャビティ内面と面一となるかそれよりも反キャビティ側の位置まで前進させることを特徴とする多色成形品の成形方法。 - 前記シリンダボア部の軸方向長さLとシリンダボア部の内径iとの比L/iが0.25〜1.7であることを特徴とする請求項3又は4に記載の多色成形品の成形方法。
- 前記固定型に前記キャビティに突出する凸部が設けられており、該凸部に前記ゲートが設けられており、
該凸部により前記第2の成形体に肉薄部が形成される多色成形品の成形方法であって、
前記第2の成形体の前記肉薄部の厚さt 4 と、その周囲部の厚さt 2 との比t 4 /t 2 が0.25〜0.75であり、
前記肉薄部の直径Dは、前記ゲートの直径の1〜5倍であることを特徴とする請求項1ないし5のいずれか1項に記載の多色成形品の成形方法。 - 前記肉薄部の厚さは、該肉薄部の周囲側ほど大きくなっていることを特徴とする請求項6に記載の多色成形品の成形方法。
- 前記第2の成形体の構成材料が結晶性樹脂を含むことを特徴とする請求項1ないし7のいずれか1項に記載の多色成形品の成形方法。
- 前記第2の成形体の構成材料の曲げ弾性率が、第1の成形体の構成材料の曲げ弾性率以上であることを特徴とする請求項1ないし8のいずれか1項に記載の多色成形品の成形方法。
- 前記第1の成形体の構成材料が非強化系樹脂組成物であり、前記第2の成形体の構成材料が強化系樹脂組成物であることを特徴とする請求項1ないし9のいずれか1項に記載の多色成形品の成形方法。
- 前記第1の成形体の構成材料が透光性であり、第2の成形体の構成材料が不透光性であることを特徴とする請求項1ないし10のいずれか1項に記載の多色成形品の成形方法。
- 前記第1の成形体の構成材料がポリカーボネート樹脂を含むものであり、前記第2の成形体の構成材料がポリカーボネート樹脂及びポリエステル樹脂を含むものであることを特徴とする請求項1ないし11のいずれか1項に記載の多色成形品の成形方法。
- 前記第2の成形体が前記第1の成形体の周縁部に設けられていることを特徴とする請求項1ないし12のいずれか1項に記載の多色成形品の成形方法。
- 請求項1ないし13のいずれか1項に記載の成形方法により成形された多色成形品。
- 請求項14の多色成形品よりなるパネルを備えた車輌。
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