PS-Chi Mei POLYREX PG-33
PS-Chi Mei POLYREX PG-33は、Chi Mei Corporationが製造する汎用ポリスチレン（GPPS）グレードであり、高い光学輝度、標準的なメルトフロー（MFI 8.0 g/10 min）、および1.04 g/cm³の軽量密度で高く評価されています。標準的な射出成形用に特別に配合されたこのグレードは、高屈折ランプシェード、透明食品容器、CDジュエルケースの世界的な標準です。ISO 9001およびIATF 16949認証取得の受託製造業者であるJucheng Precisionでは、25台以上の自社5軸CNCマシンを活用して鏡面研磨されたS136ステンレス鋼金型を切削加工しています。これによりウェルドライン欠陥を防ぎ、残留成形応力を緩和し、Zeiss CMM検査で検証された無欠陥で応力のない光学部品を提供します。.
POLYREX PG-33 Optical Brightness & Toughness Profile
POLYREX® PG-33 is a standard general-purpose polystyrene (GPPS) resin engineered by Chi Mei Corporation, valued for its high refractive index, low density, and high-gloss aesthetics:
| 物理的および光学的特性 | POLYREX PG-33 Spec Values | 成形部品のエンジニアリング上の利点 |
|---|---|---|
| Optical Refraction | High Refractive High-Brightness Index | Maximizes light transmission and dispersion, preventing internal light loss in complex lampshades and clear display frames. |
| Melt Stability | MFR 8.0 g/10 min（200°C × 5kg） | Provides a stable, predictable flow during continuous production cycles, minimizing gate blush and surface swirl defects. |
| Hardness Stiffness | Ball Indentation Hardness 149 MPa | Ensures a highly rigid structural frame, preventing flexing or dimensional bending in large clear organizer boxes. |
Structural Application & Molding Process Suitability for PG-33
With stable molecular polymerization, Chi Mei POLYREX PG-33 flows uniformly to yield pristine aesthetic finishes:
| 成形技術 | プロセス適合性と運用詳細 |
|---|---|
| Lampshades & Diffusers | Excellent. Highly suitable for molding geometrically complex transparent lampshades, light guides, and diffusing cover lenses. |
| Transparent Food Containers | Excellent. Fully optimized for high-volume transparent refrigerator crisper drawers, storage canisters, and transparent plastic cups. |
| Cosmetic & Media Enclosures | Excellent. Ideal for crystal-clear cosmetic jar display bases, cassette tape cases, and luxury retail organizers. |
PS-Chi Mei POLYREX PG-33 Tooling & Optical Refraction Guide
Molding an amorphous standard GPPS like POLYREX PG-33 requires careful gating and slow ejection to prevent stress-induced cloudiness and brittle cracking:
- Weld Line & Haze Management: GPPS is highly amorphous, meaning it has low mold shrinkage (0.3% to 0.6%). However, knit lines (weld lines) will block light transmission and degrade optical cosmetics. Jucheng’s tooling division conducts Moldflow analysis to place gates strategically, eliminating visible weld lines in functional view areas.
- Tool Steel Selection & Polishing: To fully leverage PG-33’s high-brightness properties, we use premium S136 stainless steel mold inserts, mirror-polished with high-grade diamond paste. This ensures that the molded components emerge with flawless, glass-like clarity.
- Molding Process Parameters: Process temperatures are managed at 180°C–240°C (356°F–464°F). Mold temperatures are kept at 30°C to 50°C (86°F–122°F). Slower injection speeds and low packing pressures are implemented to prevent residual molding stresses, which would cause birefringence or rainbow effects.
- Precise & Gentle Ejection: Because GPPS is highly rigid and brittle (tensile elongation 2%), sharp ejector pins can crack parts during release. We machine draft angles of at least 1.5° to 2° and utilize wide stripper plates or air-assisted ejection to distribute demolding force evenly.
Key Application Fields for PS-Chi Mei POLYREX PG-33
- Aesthetic Lighting & Optical: High-end geometric ceiling lampshades, transparent LED diffuser covers, and light-guide panels.
- Transparent Food Packing: Refrigerator crisper drawers, stackable plastic food boxes, spice jars, and transparent water tumblers.
- Consumer Goods & Packaging: Clear cassette tape cases, thick-walled cosmetic jar outer display covers, and luxury stationery organizers.
プロパティ
| 密度 | 1.04 - 1.05 g/cm³ |
| メルトマスフローレート（MFR）（200°C/5.0kg） | 8.0 g/10分 |
| 降伏点引張強度 | 41.0 MPa |
| 破断引張強度 | 37.0 MPa |
| 引張破断伸び | 2.0 - 5.0 % |
| 曲げ強度 | 62.0 MPa |
| 曲げ弾性率 | 2,400 MPa |
| アイゾット衝撃強さ（ノッチ付き、23°C） | 2.0 kJ/m² |
| Ball Indentation Hardness | 149 MPa |
| Vicat Softening Point (5.0kg, 50°C/hr) | 89.0 °C |
| Deflection Temperature Under Load (1.8 MPa) | 76.0 °C |
| 難燃性評価（1.6mm） | UL 94 HB - |
| 最大部品サイズ | 800 x 600 mm |
| 最小部品サイズ | 1 x 1 mm |