Problem & Solution

Practical answers to common plastic material challenges

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Q

Bubbles around inserts

A

The three major causes of bubbles (moisture, air entrapment, vacuum shrinkage cavities) need to be treated differently: moisture type——sufficient drying; air entrapment type——optimize plasticization and injection parameters; vacuum shrinkage cavity type——strengthen holding pressure feeding. Accur...

Material Drying bubblesraw '2079851475616104451back pressure controlvacuum shrinkage cavitymold venting

Q

Uneven thickness

A

This problem is a typical manifestation of uneven thickness in compression molding; the core of the solution lies in proper preheating of the material and assurance of flowability, as well as precise matching of mold temperature and molding pressure. It is recommended to adjust coordinately from ...

Molds & Tooling feeding amountmaterial flowabilityweighing accuracyhopper bridgingmaterial distribution

Q

Embrittlement

A

The essence of embrittlement is that the material's toughness reserve declines to the point of being unable to meet use requirements. The control key is the 'three temperatures'——processing temperature (avoid excessive degradation), drying temperature (avoid too low leaving residual moisture and ...

Material Analysis embrittlementthermal degradationdrying conditionsregrind ratioimpact strength

Q

Insufficient strength

A

This problem is a typical manifestation of insufficient strength in compression molding; the core of the solution lies in proper preheating of the material and assurance of flowability, as well as precise matching of mold temperature and molding pressure. It is recommended to adjust coordinately ...

Material Drying curing degreecatalyst dosagemold temperaturecuring timepost-curing

Q

Demolding cracks

A

This problem is a typical manifestation of demolding cracks in compression molding; the core of the solution lies in proper preheating of the material and assurance of flowability, as well as precise matching of mold temperature and molding pressure. It is recommended to adjust coordinately from ...

Molds & Tooling draft anglemold polishingholding pressurecooling timerelease agent

Q

Difficult demolding/mold sticking

A

This problem is a typical manifestation of difficult demolding/mold sticking in compression molding; the core of the solution lies in proper preheating of the material and assurance of flowability, as well as precise matching of mold temperature and molding pressure. It is recommended to adjust c...

Molds & Tooling draft anglemold polishingholding pressurecooling timerelease agent

Q

Warpage deformation

A

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

Molds & Tooling warpage deformationcooling uniformityresidual stressgate symmetryannealing

Q

Uneven shrinkage

A

This problem is a typical manifestation of uneven shrinkage in compression molding; the core of the solution lies in proper preheating of the material and assurance of flowability, as well as precise matching of mold temperature and molding pressure. It is recommended to adjust coordinately from ...

Injection Molding shrinkage ratewall thickness designcooling water channelsholding pressuredimensional accuracy

Q

Pitting/pinholes

A

This problem is a typical manifestation of pitting/pinholes in compression molding; the core of the solution lies in proper preheating of the material and assurance of flowability, as well as precise matching of mold temperature and molding pressure. It is recommended to adjust coordinately from ...

Material Drying draft anglemold polishingholding pressurecooling timerelease agent

Q

Flow lines/flow marks

A

This problem is a typical manifestation of flow lines/flow marks in compression molding; the core of the solution lies in proper preheating of the material and assurance of flowability, as well as precise matching of mold temperature and molding pressure. It is recommended to adjust coordinately ...

Molds & Tooling flow marksmelt temperaturemold temperatureinjection speedripples

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