Problem & Solution

Q

Unstable output/surging in linear low density polyethylene extrusion process (Variant: strengthened measures)

A

Unstable output is caused by unstable solids conveying; barrel temperature and feeding system need to be optimized. Targeted preventive measures need to be taken in different production scenarios.

Extrusion & Post unstable outputsurgingsolids conveyinghopper bridgingscrew rotation speed

Q

Dimensional fluctuation of linear low density polyethylene extruded products (Variant: strengthened measures)

A

Dimensional fluctuation is caused by unstable extrusion or haul-off; all process parameters need to be systematically stabilized. Targeted preventive measures need to be taken in different production scenarios.

Extrusion & Post dimensional fluctuationscrew rotation speedhaul-off speedtemperature stabilityuniform feeding

Q

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

A

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

Q

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

A

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

Q

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

A

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

Q

Melt flow rate mismatch of raw material for linear low density polyethylene extrusion (Variant: strengthened measures)

A

MFR mismatch needs to be solved by selecting appropriate grades and adjusting temperature parameters. Targeted preventive measures need to be taken in different production scenarios.

Extrusion & Post melt flow rategrade selectionextrusion gradeprocess adjustmentbatch testing

Q

Uneven wall thickness of linear low density polyethylene extruded pipes (Variant: strengthened measures)

A

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

Q

Insufficient long-term hydrostatic strength of linear low density polyethylene PPR pipes (Variant: strengthened measures)

A

Insufficient long-term hydrostatic strength is caused by material selection and processing quality; comprehensive control of raw material, process, and welding is needed. Targeted preventive measures need to be taken in different production scenarios.

Extrusion & Post hydrostatic strengthPPRmolecular weightpipe wall thicknesscrystallinity

Q

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

A

Sharkskin is the result of stick-slip flow of the melt at the die exit; it is improved by increasing die temperature and reducing extrusion speed. Targeted preventive measures need to be taken in different production scenarios.

Extrusion & Post sharkskinmelt fracturedie temperatureextrusion speeddie polishing

Q

Bamboo pattern/melt fracture on the surface of linear low density polyethylene extruded products (Variant: strengthened measures)

A

Melt fracture is flow instability caused by extrusion speed exceeding the critical value; speed needs to be reduced, temperature increased, and die design optimized. Targeted preventive measures need to be taken in different production scenarios.

Extrusion & Post melt fracturebamboo patterncritical shear ratedie temperatureextrusion speed

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