Problem & Solution

Practical answers to common plastic material challenges

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Q

Part Warpage

A

Warpage is macroscopic bending caused by inconsistent shrinkage of various parts of the part. The solution ideas are: achieve uniform cooling of all parts during the cooling stage (cooling water channel optimization), adopt symmetrical layout and isotropic design in structural design (wall thickn...

Molds & Tooling warpage deformationcooling uniformityresidual stressgate symmetryannealing

Q

Skin Layer and Core Layer Separation

A

This problem is a typical manifestation of skin layer and core layer separation in the RIM process; the core of the solution lies in ensuring the precise ratio and full mixing of the two components, while controlling the reaction temperature and curing conditions within the optimal window. It is ...

Molds & Tooling bubbleraw '2079851475616104451back pressure controlvacuum shrinkage cavitymold venting

Q

Uneven Skin Layer Thickness

A

This problem is a typical manifestation of uneven skin layer thickness in the RIM process; the core of the solution lies in ensuring the precise ratio and full mixing of the two components, while controlling the reaction temperature and curing conditions within the optimal window. It is recommend...

Molds & Tooling demolding draft anglemold polishingholding pressurecooling timerelease agent

Q

Surface Discoloration

A

This problem is a typical manifestation of surface discoloration in the RIM process; the core of the solution lies in ensuring the precise ratio and full mixing of the two components, while controlling the reaction temperature and curing conditions within the optimal window. It is recommended to ...

Molds & Tooling mixing uniformitymixing headimpingement mixingcomponent viscositymetering accuracy

Q

Poor Dimensional Accuracy

A

This problem is a typical manifestation of poor dimensional accuracy in the RIM process; the core of the solution lies in ensuring the precise ratio and full mixing of the two components, while controlling the reaction temperature and curing conditions within the optimal window. It is recommended...

Molds & Tooling shrinkage ratewall thickness designcooling water channelholding pressuredimensional accuracy

Q

Part Tearing During Demolding

A

This problem is a typical manifestation of part tearing during demolding in the RIM process; the core of the solution lies in ensuring the precise ratio and full mixing of the two components, while controlling the reaction temperature and curing conditions within the optimal window. It is recomme...

Molds & Tooling demolding draft anglemold polishingholding pressurecooling timerelease agent

Q

Poor Core Foaming

A

This problem is a typical manifestation of poor core foaming in the RIM process; the core of the solution lies in ensuring the precise ratio and full mixing of the two components, while controlling the reaction temperature and curing conditions within the optimal window. It is recommended to star...

Processing Machinery component ratiometering pumpviscosity controlisocyanate indexone-way valve

Q

Surface Foaming

A

This problem is a typical manifestation of surface foaming in the RIM process; the core of the solution lies in ensuring the precise ratio and full mixing of the two components, while controlling the reaction temperature and curing conditions within the optimal window. It is recommended to start ...

Material Drying vent groovegas back pressureoverflow wellvacuum ventingvent depth

Q

Uneven Part Density

A

This problem is a typical manifestation of uneven part density in the RIM process; the core of the solution lies in ensuring the precise ratio and full mixing of the two components, while controlling the reaction temperature and curing conditions within the optimal window. It is recommended to st...

Molds & Tooling bubbleraw '2079851475616104451back pressure controlvacuum shrinkage cavitymold venting

Q

Flash

A

The root cause of flash is that the mold-opening force generated by the cavity internal pressure exceeds the closing force of the clamping system. The logic chain of the solution is: first reduce the cavity pressure peak through process adjustment, then check and repair the clamping system to ens...

Injection Molding flashclamping forceparting line gapcavity internal pressureburr

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