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Dull surface of linear low density polyethylene extruded products (Variant: strengthened measures)

Dull surface is caused by low die temperature or too fast cooling; die temperature needs to be increased and cooling slowed. Targeted preventive measures need to be taken in different production scenarios.

Processing Machinery no glossdie temperaturecooling ratedie polishingmelt temperature

Improper production environment control during linear low density polyethylene linear low density polyethylene processing (Variant: strengthened measures)

Production environment is an important factor affecting processing quality; a complete environment control system needs to be established. Targeted preventive measures need to be taken in different production scenarios.

Material Drying environment controlworkshop temperaturehumiditycooling water temperatureprocess stability

Linear low density polyethylene extruder screw design mismatch (Variant: strengthened measures)

Screw design needs to match material characteristics and product requirements; custom dedicated screws when necessary. Targeted preventive measures need to be taken in different production scenarios.

Processing Machinery screw designcompression ratioL/D ratiomixing elementsscrew matching

Rough inner wall of linear low density polyethylene extruded products (Variant: strengthened measures)

Rough inner wall is caused by low mandrel temperature or poor surface condition; it needs to be solved from temperature control and mold maintenance. Targeted preventive measures need to be taken in different production scenarios.

Processing Machinery rough inner wallmandrel temperaturemandrel polishingmelt temperatureplasticizing quality

Degradation discoloration of linear low density polyethylene extruded products (Variant: strengthened measures)

Degradation discoloration is caused by overheating or excessive shear; it needs to be prevented from three aspects: temperature control, rotation speed, and material selection. Targeted preventive measures need to be taken in different production scenarios.

Processing Machinery degradation discolorationthermal degradationscrew rotation speedresidence timeantioxidant

Cyclic pressure fatigue failure of linear low density polyethylene PPR pipes (Variant: strengthened measures)

Fatigue failure is caused by internal defects and stress concentration; it needs to be improved from three aspects: pipe inner wall quality, welding quality, and material toughness. Targeted preventive measures need to be taken in different production scenarios.

Extrusion & Post fatigue failurePPRstress concentrationinner wall qualitywelding bead

Thermal aging performance of linear low density polyethylene PPR pipes not up to standard (Variant: strengthened measures)

Substandard thermal aging performance is caused by insufficient antioxidant system; it needs to be solved from formulation and processing temperature control. Targeted preventive measures need to be taken in different production scenarios.

Extrusion & Post thermal agingantioxidantPPRoxidation induction timeextrusion temperature

Bubbles/pores on the surface of linear low density polyethylene extruded products (Variant: strengthened measures)

Bubbles are caused by moisture vaporization or gas entrainment; they need to be solved from raw '2079851475616104451 and the venting system. Targeted preventive measures need to be taken in different production scenarios.

Material Drying bubblesporesraw '2079851475616104451ventingvolatiles

Defects caused by insufficient drying before processing of linear low density polyethylene linear low density polyethylene (Variant: strengthened measures)

Insufficient drying is a common source of processing defects; a complete drying system and moisture content inspection system needs to be established. Targeted preventive measures need to be taken in different production scenarios.

Material Drying raw '2079851475616104451moisture contentsilver streakbubblesdehumidifying drying

Uneven wall thickness of linear low density polyethylene extruded pipes (Variant: mass production scenario)

Uneven wall thickness is caused by uneven die gap or uneven temperature; it needs to be solved from mold accuracy and temperature uniformity. Targeted preventive measures need to be taken in different production scenarios.

Extrusion & Post uneven wall thicknessdie concentricitytemperature uniformityhaul-off stabilitysizing sleeve

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