Problem & Solution

Q

Bubbles / pinholes

A

The three major causes of extrusion bubbles (raw material moisture, gas from thermal decomposition, air entrainment by the screw) must be treated differently: moisture type — fully dry to the specified moisture content; decomposition type — reduce processing temperature to avoid degradation; air ...

Material Drying extrusion bubblesraw '2079851475616104451melt degradationvent vacuumscrew compression ratio

Q

Profile dimensional fluctuation

A

This problem is a typical manifestation of profile dimensional fluctuation in extrusion molding. The core of the solution lies in eliminating the root cause of the defect through systematic optimization of process parameters (temperature, speed, pressure) and precision correction of the die/sizin...

Material Drying profile dimensional fluctuationuniform feedingsizing mold wearcooling water temperaturemelt temperature

Q

Excessive moisture content in raw material

A

This problem is a typical manifestation of excessive moisture content in raw material in extrusion molding. The core of the solution lies in eliminating the root cause of the defect through systematic optimization of process parameters (temperature, speed, pressure) and precision correction of th...

Material Drying excessive moisture content in raw materialtemperaturematerial

Q

Bubbles / air holes

A

The three major causes of extrusion bubbles (raw material moisture, gas from thermal decomposition, air entrainment by the screw) must be treated differently: moisture type — fully dry to the specified moisture content; decomposition type — reduce processing temperature to avoid degradation; air ...

Material Drying extrusion bubblesraw '2079851475616104451melt degradationvent vacuumscrew compression ratio

Q

Rough surface / matte surface

A

This problem is a typical manifestation of rough surface / matte surface in extrusion molding. The core of the solution lies in eliminating the root cause of the defect through systematic optimization of process parameters (temperature, speed, pressure) and precision correction of the die/sizing ...

Material Drying poor plasticationfeed temperaturemixing timeplasticizer dosageresin particle size

Q

Unstable feeding amount

A

This problem is a typical manifestation of unstable feeding amount in transfer molding; the core of the solution lies in the rational design of the runner and gate system, the effective transmission of transfer pressure, and the uniform control of mold temperature. It is recommended to start trou...

Material Drying feeding amountmaterial flowabilityweighing accuracyhopper bridgingmaterial distribution

Q

Insufficient product strength

A

This problem is a typical manifestation of insufficient product strength in transfer molding; the core of the solution lies in the rational design of the runner and gate system, the effective transmission of transfer pressure, and the uniform control of mold temperature. It is recommended to star...

Material Drying curing degreecatalyst dosagemold temperaturecuring timepost-curing

Q

Blistering/bubbles

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

Product whitening

A

This problem is a typical manifestation of product whitening 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

Volatile content exceeding standard

A

This problem is a typical manifestation of volatile content exceeding standard 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...

Material Drying volatile content exceeding standard

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