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Some Injection Molding experience of Rapid Tooling

Rapid Tooling is a simplified injection molding tool. A better understanding of injection molding, would be good for saving lead time and cost.  We organize some injection molding knowledges, which may be confronted before. In occasions, they would be helpful for our customers for product development.


1) FR resins (for example fire retardant ABS), if parts in this kind of materials, it will be very difficult molded in snow white (similar as Mac Charger white), because of their natural color. After adding fire retardant additive, FR resins would be a bit yellow in natural. 

2) PC, polycarbonate, we would not suggest for using at frame covers, which with an open window in the center of the part. It’s because of its flowing property. Melting line will be easy to happen at frame part, if molded in PC (with bad flowing ability), melting line would be more serious.

3) POM, is not adhesive with other material in normal. It’s not suitable for common over-molding (hard-component with soft-component covered), while good for moveable over-molding. For example, the connection part between legs and body, hand and body of a Barbie doll. POM is also very good for bump-off, for trial of challenging undercuts.

4) If for enclosures (front cover & back covers), both with a same molding color, we would suggest to put them in a family mold, if without tooling structure concerns. Just in case slight color variance, at different molding situation, or at different batch of production.

5) Glass fiber additive can help parts stronger and more stable, and less shrinkage in thick sections. But please be careful at the parts with bad flowing ability, for example with PC. It will easily cause molding issues, for example short shot. Also, if for cosmetic parts, please be notified that there will be glass fiber mark at the top surfaces.

6) Injection molding resins will shrink in property. Different material with its own shrinkage. If for materials trial, or material testing with rapid tooling, kindly please note that different material may with different shrinkage, then cause dimensions variance. Try to find a series testing material with close shrinkage, before tool building start.

7) Undercuts, normally would need sliders, lifters, or manual inserts for de-molding. If without cosmetic concern, we would suggest adjust them as shut-off structure as many as possible. It can help saving tooling cost significantly.



Much more rapid tooling and injection molding experience and knowledge, we will try to organize and sort them out, clearly and understanding-easily at our website www.dankemold.com.  Meanwhile, if you have any manufacturing enquiries at plastic injection molding, or an on-going job need design for free design for manufacturing analysis, please feel free to contact Danke Mold via info@dankemold.com