Injection Molding Defects and Troubleshooting — The Complete Practical Guide

Injection molding machine for plastic parts manufacturing - Nylonplastic custom injection molding

Common Injection Molding Defects

Short Shots

Insufficient material fills the cavity. Solutions: Increase injection pressure, raise melt temperature, check for leaks.

Sink Marks

Visible depressions on thick sections. Solutions: Increase packing pressure, adjust cooling time, reduce wall thickness variation.

Flash

Excess material escapes the cavity. Solutions: Reduce injection pressure, repair worn molds, check clamp force.

Warpage

Uneven cooling causes distortion. Solutions: Uniform cooling, symmetric wall design, post-mold annealing.

Surface Streaks

Flow lines visible on surface. Solutions: Increase melt temperature, modify gate location, improve venting.

常見問題

What is the typical lead time for custom orders?

Standard lead times range from 3-15 business days depending on order complexity and quantity. Rush orders can often be accommodated with 24-hour turnaround for prototypes.

What quality certifications do you have?

Our manufacturing facility is ISO 9001 certified, and we maintain rigorous quality control processes throughout production. Material certifications and test reports are available upon request.

What is your minimum order quantity (MOQ)?

We offer flexible MOQ starting from just 1 piece for prototypes, scaling up to millions of pieces for mass production. This allows you to validate designs before committing to larger orders.

Can you provide material certification and test reports?

Yes, we provide full material traceability and certification documentation including COA (Certificate of Analysis), physical property test reports, and RoHS/REACH compliance documentation as required.

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