Problem & Solution

Q

Dimensional fluctuation of heat-resistant polyethylene extruded products (Variant: strengthened measures)

A

Dimensional fluctuation is caused by unstable extrusion or haul-off, and each process parameter needs 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 heat-resistant polyethylene PPR pipes (Variant: strengthened measures)

A

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

Extrusion & Post fatigue failure PPR stress concentration inner wall quality welding bead

Q

Thermal aging performance of heat-resistant polyethylene PPR pipes not up to standard (Variant: strengthened measures)

A

Thermal aging performance not up to standard is caused by insufficient antioxidant system, and needs to be solved from formulation and processing temperature control. In different production scenarios, targeted preventive measures need to be taken.

Extrusion & Post thermal aging antioxidant PPR oxidation induction time extrusion temperature

Q

Melt flow rate mismatch of raw materials for heat-resistant polyethylene extrusion (Variant: mass production scenario)

A

MFR mismatch needs to be solved by selecting suitable grades and adjusting temperature parameters. In different production scenarios, targeted preventive measures need to be taken.

Extrusion & Post melt flow rate grade selection extrusion grade process adjustment batch inspection

Q

Uneven wall thickness of heat-resistant polyethylene extruded pipes (Variant: mass production scenario)

A

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

Extrusion & Post uneven wall thickness die concentricity uniform temperature stable haul-off sizing sleeve

Q

Melt flow rate mismatch of raw materials for heat-resistant polyethylene extrusion (Variant: strengthened measures)

A

MFR mismatch needs to be solved by selecting suitable grades and adjusting temperature parameters. In different production scenarios, targeted preventive measures need to be taken.

Extrusion & Post melt flow rate grade selection extrusion grade process adjustment batch inspection

Q

Uneven wall thickness of heat-resistant polyethylene extruded pipes (Variant: strengthened measures)

A

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

Extrusion & Post uneven wall thickness die concentricity uniform temperature stable haul-off sizing sleeve

Q

Sharkskin appears on the surface of heat-resistant polyethylene extruded products (Variant: mass production scenario)

A

Sharkskin is the result of stick-slip flow of the melt at the die exit, and is improved by raising the die temperature and reducing the extrusion speed. In different production scenarios, targeted preventive measures need to be taken.

Extrusion & Post sharkskin melt fracture die temperature extrusion speed die polishing

Q

Insufficient long-term hydrostatic strength of heat-resistant polyethylene PPR pipes (Variant: strengthened measures)

A

Insufficient long-term hydrostatic strength is caused by material selection and processing quality, and needs to be comprehensively controlled from raw materials, processes, and welding. In different production scenarios, targeted preventive measures need to be taken.

Extrusion & Post hydrostatic strength PPR molecular weight pipe wall thickness crystallinity

Q

Sharkskin appears on the surface of heat-resistant polyethylene extruded products (Variant: strengthened measures)

A

Sharkskin is the result of stick-slip flow of the melt at the die exit, and is improved by raising the die temperature and reducing the extrusion speed. In different production scenarios, targeted preventive measures need to be taken.

Extrusion & Post sharkskin melt fracture die temperature extrusion speed die polishing

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