درجات البولي أوكسي ميثيلين (POM/أسيتال) الشاملة التي نقوم بصبها
نقوم بمعالجة تركيبات POM عالية الصلابة ومنخفضة التآكل من كبرى شركات البتروكيماويات العالمية، لدعم التجميعات الميكانيكية شديدة الصعوبة:
| فئة مادة POM |
العلامة التجارية والدرجة النموذجية |
الخصائص والمزايا الرئيسية |
| POM متجانس |
• DuPont Delrin 100P / 500P / 900P
• DuPont Delrin 150 |
Higher crystalline structure offering superior room-temperature tensile strength, stiffness, fatigue resistance, and creep resistance compared to copolymers. Applied in high-load mechanical gears and levers. |
| POM Copolymer |
• Celanese Celcon M90 / M270
• Polyplastics Duracon M90-44
• Mitsubishi Iupital F20-03 |
Outstanding thermal stability, chemical resistance, hydrolytic stability, and excellent processability (less prone to mold deposit). Ideal for hot water valves, fuel caps, and electronic components. |
| Low Wear & Friction |
• DuPont Delrin 500AL / 100AL
• Polyplastics Duracon AW-01
• Celanese Hostaform C 9021 TF |
Modified with PTFE (Teflon), silicone, or chemical lubricants to lower the coefficient of friction and dramatically increase wear life. Engineered for silent sliding tracks and heavy-duty wear rings. |
Applicable Molding Processes for POM (Acetal)
POM’s precise crystallization rate and fluid flow behaviors support complex molding architectures:
| عملية القولبة |
ملاءمة العملية والتطبيق |
| حقن القوالب القياسي |
Excellent. Highly optimized for automotive gear sets, pulleys, zippers, sliding plates, and high-stiffness fasteners. |
| القولبة بالحقن الدقيق |
Excellent. POM’s exceptional flow and fast solidification rate make it the leading choice for micro-gears, tiny clock parts, and micro-actuators. |
| قولبة الإدراج |
Good. Allows precision encapsulation of metal shafts, rotating pins, and bushings inside wear-resistant POM housings. |
POM (Polyoxymethylene) Tooling & Manufacturing Guide
While POM processes smoothly, its highly crystalline nature and gas emission profiles require highly experienced mold design and process control:
- التجفيف المسبق: POM has exceptionally low moisture absorption. However, to guarantee high surface cosmetics on visual components, we pre-dry POM resin at 80°C–90°C (176°F to 194°F) for 2 hours.
- درجة حرارة الذوبان: Processed between 190°C and 230°C (374°F to 446°F) for Homopolymers, and 180°C to 210°C (356°F to 410°F) for Copolymers. Melt temperatures must never exceed 240°C, or the resin will decompose, releasing corrosive formaldehyde gas.
- درجة حرارة القالب: Managed at elevated levels between 80°C and 120°C (176°F to 248°F). High mold temperatures ensure complete crystalline formulation, which is critical for dimensional stability and mechanical strength.
- Meticulous Venting Design: Formaldehyde outgassing occurs naturally during POM processing, which can corrode mold steel. Jucheng’s in-house tooling division machines robust venting channels (0.02mm depth) and uses corrosion-resistant mold steel (e.g., S136) to ensure continuous, flawless production.
- Shrinkage Control: POM exhibits high volumetric shrinkage (typically 1.8% to 2.5%). Our engineers calculate shrinkage isotropic trends and implement uniform wall thickness designs to eliminate sink marks and warpage.
Key Application Industries for Molded POM Components
- Automotive Mechanisms (IATF 16949 Certified): Window regulator brackets, door latch mechanisms, seat belt tensioner gears, windshield wiper pivots, and fuel sender units.
- Consumer & Mechanical Goods: Moving gears for printers, conveyor roller wheels, sliding zippers, snap-fit buttons, and water mixer valves.
- Medical Drug Delivery (ISO 13485 Compliant): Dry-powder inhaler gears, insulin pen internal slide racks, surgical tool sliding blocks, and dosing mechanism housings.
- Fluid Handling & Valves: Pump impellers, chemical spray nozzles, water meter components, household faucet valves, and pipe couplings.
