Problem & Solution

Q

Sharkskin appears on the surface of cross-linked 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 increasing the die temperature and reducing the extrusion speed. Targeted preventive measures need to be taken in different production scenarios.

Extrusion & Post sharkskinmelt fracturedie temperatureextrusion speeddie polishing

Q

Excessive shrinkage rate of random copolymer polypropylene pipe special material extruded products

A

Excessive shrinkage rate is caused by high crystallinity or high temperature, and needs to be solved by controlling the temperature and cooling rate.

Extrusion & Post shrinkage rate crystallinity melt temperature cooling rate haul-off speed

Q

Longitudinal reversion rate of random copolymer polypropylene pipe special material pipes exceeding the standard

A

Reversion rate exceeding the standard is caused by large internal stress or excessive orientation, and needs to be solved from temperature control, cooling rate, and haul-off speed.

Extrusion & Post longitudinal reversion rate internal stress cooling rate haul-off speed molecular orientation

Q

Melt flow rate mismatch of raw materials for random copolymer polypropylene pipe special material extrusion

A

MFR mismatch needs to be solved by selecting suitable grades and adjusting temperature parameters.

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

Q

Sharkskin appears on the surface of random copolymer polypropylene pipe special material extruded products

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.

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

Q

Bending deformation of random copolymer polypropylene pipe special material extruded pipes (Variant: mass production scenario)

A

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

Extrusion & Post pipe bending uneven cooling haul-off alignment uniform wall thickness straightness

Q

Ovality of random copolymer polypropylene pipe special material pipes exceeding the standard (Variant: strengthened measures)

A

Ovality exceeding the standard is caused by uneven cooling or external force deformation, and needs to be solved from cooling uniformity and pipe storage. In different production scenarios, targeted preventive measures need to be taken.

Extrusion & Post ovality uniform cooling sizing sleeve haul-off clamping pipe storage

Q

Die marks/lines on random copolymer polypropylene pipe special material 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 cleaned and checked regularly. In different production scenarios, targeted preventive measures need to be taken.

Extrusion & Post die mark die scratch impurity cleaning flow channel design filter screen

Q

Bending deformation of random copolymer polypropylene pipe special material extruded pipes (Variant: strengthened measures)

A

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

Extrusion & Post pipe bending uneven cooling haul-off alignment uniform wall thickness straightness

Q

Die marks/lines on random copolymer polypropylene pipe special material extruded products (Variant: strengthened measures)

A

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

Extrusion & Post die mark die scratch impurity cleaning flow channel design filter screen

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