درجات البولي بروبيلين (PP) الشائعة التي نقوم بقولبتها
نقوم بتوريد ومعالجة راتنجات PP عالية الجودة من كبار المصنعين العالميين لتلبية المتطلبات الوظيفية المحددة:
| النوع الفرعي لمادة PP |
العلامة التجارية والدرجة النموذجية |
الخصائص والمزايا الرئيسية |
| بولي بروبيلين متجانس |
LyondellBasell Moplen HP500N
ExxonMobil PP1013 |
High stiffness-to-weight ratio, excellent chemical resistance, and elevated temperature resistance. Ideal for rigid packaging and household appliances. |
| PP Impact Copolymer |
Sabic PP 570P
LyondellBasell Moplen EP300K |
Enhanced impact strength at low temperatures, high durability, and crack resistance. Widely used for automotive bumpers, battery cases, and heavy-duty crates. |
| PP Random Copolymer |
Borealis RF365MO
TotalEnergies PPR 7220 |
Superior optical clarity, high gloss, and good impact resistance. Frequently specified for medical syringes, labware, and transparent housewares. |
Applicable Molding Processes for PP
Polypropylene’s excellent melt flow behavior and adaptability allow it to be processed via several molding techniques:
| عملية القولبة |
ملاءمة العملية والتطبيق |
| حقن القوالب القياسي |
Excellent. Highly suitable for producing high-volume consumer goods, living hinges, and structural components with optimized cycle times. |
| قولبة الجدران الرقيقة |
High. PP’s high melt flow index (MFI) allows it to easily fill long flow paths and thin-walled structures, ideal for food containers and medical disposable packaging. |
| قولبة الإدراج |
Moderate to High. Metal inserts, threads, or structural plates can be molded directly into PP parts to improve local mechanical strength. |
| التشكيل الزائد / التشكيل ثنائي اللون (2K) |
Good. Frequently overmolded with thermoplastic elastomers (TPE/TPU) to create soft-touch handles, seals, or non-slip grips. |
Polypropylene (PP) Manufacturing & Processing Guide
To achieve high structural integrity and dimensional consistency, our engineering team adheres to scientific molding parameters for PP resins:
- التجفيف المسبق: Generally not required as PP absorbs minimal moisture. However, for critical medical or high-aesthetic applications, we pre-dry at 80°C (176°F) for 1–2 hours to eliminate surface splay.
- درجة حرارة الذوبان: Typically set between 200°C and 250°C (392°F to 482°F). Thermal degradation can occur if temperatures exceed 280°C.
- درجة حرارة القالب: Kept between 20°C and 80°C (68°F to 176°F). Higher mold temperatures improve gloss and crystallinity but can increase cycle times and shrinkage.
- Injection Pressure: Injection pressure is usually maintained between 50 and 120 MPa, with adequate holding pressure to minimize shrinkage and sink marks.
- Shrinkage Control: Volumetric shrinkage ranges from 1.5% to 2.0%. Jucheng’s tooling engineers compensate for this shrinkage through precision mold core/cavity dimension adjustments.
Key Application Industries for PP Molded Parts
- Medical Devices (ISO 13485 Compliant): Autoclavable laboratory vials, syringe plungers, diagnostic test kits, and pill dispensers.
- Automotive Components (IATF 16949 Compliant): Battery cases, interior door panels, dashboard trims, bumper covers, and fluid reservoirs.
- Packaging & Closures: Hinged caps, child-resistant closures, food containers, thin-walled storage boxes, and household bins.
- Consumer & Industrial Goods: Power tool housings, appliance brackets, lawnmower components, and heavy-duty structural gears.
