Problem & Solution

Q

Insufficient long-term hydrostatic strength of heat-resistant polyethylene PPR pipes

A

Insufficient long-term hydrostatic strength is caused by material selection and processing quality, and needs to be comprehensively controlled from raw materials, process and welding.

Extrusion & Post hydrostatic strengthPPRmolecular weightpipe wall thicknesscrystallinity

Q

Sharkskin appears on the surface of heat-resistant polyethylene extruded products

A

Sharkskin is the result of stick-slip flow of the melt at the die exit, and is improved by increasing the die temperature and reducing the extrusion speed.

Extrusion & Post sharkskinmelt fracturedie temperatureextrusion speeddie polishing

Q

Bamboo-node pattern/melt fracture appears on the surface of heat-resistant polyethylene extruded products

A

Melt fracture is flow instability caused by extrusion speed exceeding the critical value, and the speed needs to be reduced, the temperature increased and the die design optimized.

Extrusion & Post melt fracturebamboo-node patterncritical shear ratedie temperatureextrusion speed

Q

Bending deformation of heat-resistant polyethylene extruded pipes (Variant: mass production scenario)

A

Pipe bending is caused by non-uniform cooling or haul-off eccentricity, and needs to be solved from cooling uniformity and equipment alignment. Targeted preventive measures need to be taken in different production scenarios.

Extrusion & Post pipe bendinguneven coolinghaul-off alignmentuniform wall thicknessstraightness

Q

Heat-resistant polyethylene pipe ovality exceeding standard (Variant: strengthened measures)

A

Excessive ovality is caused by uneven cooling or external force deformation, and needs to be solved from cooling uniformity and pipe storage. Targeted preventive measures need to be taken in different production scenarios.

Extrusion & Post ovalityuniform coolingsizing sleevehaul-off clampingpipe storage

Q

Die marks/lines appear on heat-resistant polyethylene extruded products (Variant: mass production scenario)

A

Die marks are caused by die inner wall damage or impurities, and the die condition needs to be regularly cleaned and inspected. Targeted preventive measures need to be taken in different production scenarios.

Extrusion & Post die markdie scratchimpurity cleaningflow channel designscreen pack

Q

Bending deformation of heat-resistant polyethylene extruded pipes (Variant: strengthened measures)

A

Pipe bending is caused by non-uniform cooling or haul-off eccentricity, and needs to be solved from cooling uniformity and equipment alignment. Targeted preventive measures need to be taken in different production scenarios.

Extrusion & Post pipe bendinguneven coolinghaul-off alignmentuniform wall thicknessstraightness

Q

Die marks/lines appear on heat-resistant polyethylene extruded products (Variant: strengthened measures)

A

Die marks are caused by die inner wall damage or impurities, and the die condition needs to be regularly cleaned and inspected. Targeted preventive measures need to be taken in different production scenarios.

Extrusion & Post die markdie scratchimpurity cleaningflow channel designscreen pack

Q

Excessive shrinkage of heat-resistant polyethylene extruded products (Variant: mass production scenario)

A

Excessive shrinkage is caused by high crystallinity or high temperature, and needs to be solved by controlling temperature and cooling rate. Targeted preventive measures need to be taken in different production scenarios.

Extrusion & Post shrinkage ratecrystallinitymelt temperaturecooling ratehaul-off speed

Q

Die head pressure fluctuation of heat-resistant polyethylene extruder (Variant: mass production scenario)

A

Die head pressure fluctuation is caused by unstable output or filtration system problems, and extrusion parameters need to be stabilized and the filtration system maintained. Targeted preventive measures need to be taken in different production scenarios.

Extrusion & Post pressure fluctuationscreen packdie head temperaturebreaker plateuniform output

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