Problem & Solution

Practical answers to common plastic material challenges

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Q

Unstable product weight

A

In summary, the causes of the "Unstable product weight" problem can be attributed to the combined action of multiple factors such as fluctuation of parison length or wall thickness and variation in raw material density. Solving this problem requires starting from aspects such as stabilize the wal...

Material Drying Unstable product weight extrusion '2079851475616104457 raw material management wall thickness control

Q

Parison being pulled apart

A

In summary, the causes of the "Parison being pulled apart" problem can be attributed to the combined action of multiple factors such as insufficient melt strength and extrusion speed too fast. Solving this problem requires starting from aspects such as reduce the extrusion speed and select a high...

Material Drying Parison being pulled apart extrusion '2079851475616104457 speed control resin characteristics

Q

Moisture contained in the raw material

A

In summary, the causes of the "Moisture contained in the raw material" problem can be attributed to the combined action of multiple factors such as raw material not fully dried and humid storage environment. Solving this problem requires starting from aspects such as use a dehumidifying dryer to ...

Material Drying Moisture contained in the raw material extrusion '2079851475616104457 raw material management drying treatment

Q

Bubbles

A

In summary, the causes of the "Bubbles" problem can be attributed to the combined action of multiple factors such as moisture content of the raw material too high and air entrapped in the melt. Solving this problem requires starting from aspects such as fully dry the raw material and check the sc...

Material Drying Bubbles extrusion '2079851475616104457 raw material management venting design screw maintenance

Q

Bottle body brittle cracking (drop cracking)

A

In summary, the causes of the "Bottle body brittle cracking (drop cracking)" problem can be attributed to the combined action of multiple factors such as resin melt index too low and regrind proportion too high. Solving this problem requires starting from aspects such as select a resin with an ap...

Material Drying Bottle body brittle cracking (drop cracking) extrusion '2079851475616104457 resin characteristics regrind management welding quality

Q

Severe Fluctuation of Cold Shock Feeding in the Screw Feed Section

A

This problem is a typical manifestation of severe fluctuation of cold shock feeding in the screw feed section in melt spinning. The core of the solution lies in the precise stability of the spinning temperature, the high-precision control of metering supply, and the optimized maintenance of the s...

Material Drying severe fluctuation of cold shock feeding in the screw feed sectiontemperature

Q

Chip Moisture Content

A

This problem is a typical manifestation of chip moisture content in melt spinning. The core of the solution lies in the precise stability of the spinning temperature, the high-precision control of metering supply, and the optimized maintenance of the spinneret/cooling air field. It is recommended...

Material Drying chip dryingmoisture contentdrying dew pointhydrolytic degradationspinning temperature

Q

Melt Degradation/Yellowing

A

The essence of degradation yellowing is that polymer molecular chains undergo chain scission and chemical changes under high-temperature and high-shear conditions. The core of the solution is "three controls": control the processing temperature within the recommended range of the material, contro...

Material Drying degradation yellowingprocessing temperatureresidence timeheat stabilizerPVC dehydrochlorination

Q

Bubble Filament

A

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

Material Drying extrusion bubblesraw '2079851475616104451melt degradationvent vacuum degreescrew compression ratio

Q

Filament Breakage/Floating Filament

A

The essence of filament breakage is that the stress borne by an individual filament at a certain instant exceeds its breaking strength at that moment. The core of the solution is "eliminating weak points + stabilizing conditions": fully dry the chips to eliminate hydrolysis weak points, stabilize...

Material Drying degradation yellowingprocessing temperatureresidence timeheat stabilizerPVC dehydrochlorination

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