일반적인 사출 성형 결함
Injection molding defects can affect part appearance, function, and cost. Understanding root causes enables quick troubleshooting and prevention.
1. Sink Marks
모양: Depressions on part surface, typically near thick sections.
Causes:
- Excessive wall thickness variation
- Ribs too thick relative to wall
- Insufficient cooling time
- High packing pressure needed
해결책:
- Reduce rib thickness to 50-70% of wall
- Increase cooling time
- Optimize packing pressure and time
- Use gas-assist molding for thick sections
2. Flash
모양: Thin excess plastic at parting lines or around features.
Causes:
- Insufficient clamp force
- Worn mold components
- Excessive injection pressure
- Poor mold alignment
해결책:
- Increase clamp tonnage
- Repair or replace worn components
- Reduce injection pressure
- Check mold alignment and guide pins
3. Short Shots
4. Warpage
모양: Part distortion after ejection.
Causes:
- Non-uniform cooling
- Asymmetric part design
- Incorrect ejection timing
- Material shrinkage variation
해결책:
- Optimize cooling channel design
- Balance wall thickness
- Adjust ejection timing
- Use material with lower shrinkage
5. Weld Lines
모양: Visible lines where flow fronts meet.
Causes:
- Multiple gates or flow fronts
- Holes or inserts creating flow splits
- Low injection speed
- Cold material at meeting point
해결책:
- Move weld lines to non-critical areas
- Increase injection speed
- Raise mold temperature
- Add overflow wells at weld locations
Defect Prevention Checklist
- Design parts with uniform wall thickness
- Include adequate draft angles
- Provide proper venting
- Optimize gate location
- Ensure balanced cooling
결론
Most injection molding defects stem from design, processing, or mold issues. Early detection and systematic troubleshooting minimize production downtime and scrap rates.
관련 리소스
- 엔지니어링 플라스틱 비용 요소
- PEEK와 PEI 비교
- Flame Retardant Plastics
- Food Grade Plastics Guide
- Nylon Moisture Treatment
관련 리소스
- 엔지니어링 플라스틱 비용 요소
- PEEK와 PEI 비교
- Flame Retardant Plastics
- Food Grade Plastics Guide
- Nylon Moisture Treatment
관련 리소스
- 엔지니어링 플라스틱 비용 요소
- PEEK와 PEI 비교
- Flame Retardant Plastics
- Food Grade Plastics Guide
- Nylon Moisture Treatment
자주 묻는 질문
When does Plastic Injection Molding Defects — Causes and Solutions make sense?
Plastic Injection Molding Defects — Causes and Solutions makes sense when the part volume, material choice, geometry, and repeatability needs justify mold design and tooling investment.
What design factors matter most for Plastic Injection Molding Defects — Causes and Solutions?
벽 두께, 리브, 보스, 이형각, 게이트 위치, 수축, 분할선, 이젝션 등은 모두 성형 부품의 품질에 영향을 미칩니다.
금형 제작 전에 어떤 정보가 필요한가요?
공급업체는 3D 모델, 재질, 예상 연간 생산량, 외관 요구 사항, 공차 요구 사항 및 조립 또는 기능 테스트 관련 요구 사항을 확인해야 합니다.
What is the biggest risk in Plastic Injection Molding Defects — Causes and Solutions?
가장 큰 위험은 실제 적용 환경에서 재료의 거동, 수축, 유동 및 부품의 기능을 충분히 검증하지 않은 상태에서 금형을 승인하는 것입니다.
