Problem & Solution

Practical answers to common plastic material challenges

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Q

Surface dullness/darkening

A

This problem is a typical manifestation of surface dullness/darkening 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 coordina...

Material Drying surface glossmold polishingmold temperatureholding pressurerelease agent

Q

Blister

A

This problem is a typical manifestation of blister 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 both aspe...

Thermoforming curing degreecatalyst dosagemold temperaturecuring timepost-curing

Q

Bubbles/blistering

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

Over-curing/scorching

A

The core of curing abnormality is that the rate and degree of the crosslinking reaction deviate from the optimal window. The adjustment idea is the 'three-element method': formulation (precise metering of catalyst/curing agent), temperature (precise control of mold and material temperature), time...

Molds & Tooling curing degreecatalyst dosagemold temperaturecuring timepost-curing

Q

Overflow 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...

Molds & Tooling flashclamping forceparting line gapcavity internal pressureburr

Q

Insufficient filling/material shortage

A

This problem is a typical manifestation of insufficient filling/material shortage 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 adj...

Injection Molding insufficient fillingmaterial flowabilitymolding pressuremold temperaturefeeding amount

Q

Metering System Pressure Fluctuation

A

This problem is a typical manifestation of metering system pressure fluctuation 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 ...

Injection Molding metering system pressure fluctuationpressure

Q

Mold Wear

A

This problem is a typical manifestation of mold wear 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 troubl...

Molds & Tooling dimensional accuracyholding pressuremold temperatureshrinkage ratecheck ring

Q

Mold Corrosion

A

This problem is a typical manifestation of mold corrosion 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 t...

Molds & Tooling mold corrosionmold

Q

Strong Part Odor

A

This problem is a typical manifestation of strong part odor 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...

Molds & Tooling demolding draft anglemold polishingholding pressurecooling timerelease agent

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