Problem & Solution

Practical answers to common plastic material challenges

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Q

Moisture Content Exceeding Standard

A

This problem is a typical manifestation of moisture content exceeding standard 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 r...

Material Drying moisture content exceeding standard

Q

Embrittlement / Insufficient Strength

A

The essence of embrittlement is that the material toughness reserve drops to a level that cannot meet the use requirements. The key to control is the "three temperatures" — processing temperature (avoid excessive degradation), drying temperature (avoid too low leaving residual moisture and too hi...

Material Drying embrittlementthermal degradationdrying conditionsrecycled material ratioimpact strength

Q

Air Entrapment / Bubble

A

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

Material Drying bubbleraw '2079851475616104451back pressure controlvacuum shrinkage cavitymold venting

Q

Incomplete Curing

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...

Material Drying curing degreecatalyst dosagemold temperaturecuring timepost-curing

Q

Degradation of Moisture-Sensitive Materials

A

This problem is a typical manifestation of moisture-sensitive material degradation in '2079851475616104452; the core of the solution lies in eliminating the root cause of the defect through systematic optimization of process parameters (temperature, pressure, speed) and rationality checks of mold...

Material Drying thermal degradationprocessing temperatureresidence timeheat stabilizeryellowing

Q

Insufficient Drying

A

This problem is a typical manifestation of insufficient drying in '2079851475616104452; the core of the solution lies in eliminating the root cause of the defect through systematic optimization of process parameters (temperature, pressure, speed) and rationality checks of mold design. It is recom...

Material Drying insufficient dryingtemperaturematerial

Q

Embrittlement

A

The essence of embrittlement is that the material toughness reserve drops to a level that cannot meet the use requirements. The key to control is the "three temperatures" — processing temperature (avoid excessive degradation), drying temperature (avoid too low leaving residual moisture and too hi...

Material Drying weld linemelt temperatureventing designgate layoutmolecular diffusion

Q

Silver Streak / Material Flower

A

The essence of silver streaks is that gas/volatile components expand in the melt to form surface defects. The first priority of the solution is always to fully dry the raw material, followed by controlling the barrel temperature to avoid material degradation and gas generation, supplemented by op...

Material Drying silver streakraw '2079851475616104451barrel temperatureback pressurescrew speed

Q

Bubble / Void

A

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

Material Drying bubbleraw '2079851475616104451back pressure controlvacuum shrinkage cavitymold venting

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