درجات البولي إيثيلين (PE) الشاملة التي نقوم بصبها
نقوم بمعالجة مجموعة واسعة من راتنجات البولي إيثيلين من شركات البتروكيماويات العالمية الرائدة، لدعم متطلبات هيكلية ومرونة متنوعة:
| النوع الفرعي لمادة PE |
العلامة التجارية والدرجة النموذجية |
الخصائص والمزايا الرئيسية |
HDPE
(عالية الكثافة) |
• داو بولي إيثيلين DMDA-8007
• Sabic HDPE CC2056
• LyondellBasell Hostalen ACP 5831 D
• Chevron Phillips Marlex 9006 |
High tensile strength, rigid molecular structure, excellent chemical resistance, and low temperature toughness. Perfect for heavy-duty containers, caps, and automotive fluid reservoirs. |
LDPE
(Low-Density) |
• ExxonMobil LDPE LD 605
• Dow LDPE 722
• LyondellBasell Lupolen 2420H
• Sabic LDPE HP0322 |
High flexibility, superior impact toughness at low temperatures, and excellent moisture barrier properties. Widely used for flexible lids, squeeze caps, and consumer containers. |
LLDPE
(Linear Low-Density) |
• Dow DOWLEX 2045G
• ExxonMobil LLDPE LL 1001
• Sabic LLDPE 118N
• Chevron Phillips Marlex LLDPE |
Higher tensile strength, puncture resistance, and flexibility compared to standard LDPE. Extensively applied in snap-fit assemblies, heavy-duty lids, and impact-modified housings. |
UHMWPE / Specialty PE
(Ultra-High Molecular) |
• Celanese GUR 4120
• Celanese GUR 4150
• Mitsui Lubmer LY1040 (Specialty Injection Grade) |
Unrivaled self-lubricating properties, extreme wear resistance, and high impact strength. Molded using specialty high-pressure injection molding for gears and sliding guides. |
Applicable Molding Processes for Polyethylene (PE)
Polyethylene’s low melt viscosity and excellent thermal stability support various molding methodologies:
| عملية القولبة |
ملاءمة العملية والتطبيق |
| حقن القوالب القياسي |
Excellent. Ideal for mass-producing consumer container caps, durable household goods, and rigid structural crates. |
| قولبة الجدران الرقيقة |
High. Primarily utilized with high-MFI HDPE and LDPE resins to produce lightweight food containers and cosmetic lids. |
| قولبة الإدراج |
Good. Allows integration of metallic fasteners or brass bushings directly into PE components to support threaded assemblies. |
| القولبة الزائدة / متعددة اللقطات |
Moderate to High. Frequently overmolded with compatible grades of TPE or specialized elastomeric materials to create non-slip handles. |
Polyethylene (PE) Manufacturing & Tooling Guide
Due to PE’s semi-crystalline nature and highly dynamic molecular shrinkage, strict control of scientific molding boundaries is mandatory:
- التجفيف المسبق: Normally not required due to PE’s low water absorption (<0.01%). If stored in high-humidity conditions, pre-dry at 70°C–80°C (158°F–176°F) for 1–2 hours.
- درجة حرارة الذوبان: Set between 180°C and 260°C (356°F to 500°F). Exceeding 280°C can result in chemical chains fracturing and material yellowing.
- درجة حرارة القالب: Managed between 20°C and 60°C (68°F to 140°F). Higher mold temperatures improve mechanical strength and gloss but increase volumetric shrinkage.
- Shrinkage Control: Volumetric shrinkage is exceptionally high, typically 1.5% to 3.0% depending on part thickness and density. Jucheng’s tooling engineers calculate customized drafts and gates during DFM to prevent sink marks.
- Venting Design: PE processing is prone to gas entrapment. Precise venting channels of 0.02mm to 0.03mm are machined on the mold parting lines to prevent diesel burns.
Key Application Industries for Molded PE Components
- Medical & Laboratory (ISO 13485): Disposable pipettes, diagnostic cassettes, protective syringe caps, sample tubes, and reagent bottle closures.
- Automotive Engineering (IATF 16949): Windshield washer fluid reservoirs, expansion tanks, protective wire harness shields, and inner trim brackets.
- Packaging & Closures: Child-resistant pharmaceutical caps, living-hinge snap-top closures, chemical-resistant containers, and food storage containers.
- Consumer & Outdoor Gear: Heavy-duty logistics crates, structural household brackets, impact-resistant protective cases, and sports equipment.
