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Bamboo pattern/melt fracture appears on the surface of heat-resistant polyethylene extruded products (Variant: strengthened measures)

Melt fracture is flow instability caused by the extrusion speed exceeding the critical value, and it is necessary to reduce the speed, raise the temperature, and optimize the die design. In different production scenarios, targeted preventive measures need to be taken.

Extrusion & Post melt fracture bamboo pattern critical shear rate die temperature extrusion speed

Ovality of general-purpose polyethylene pipes exceeding the standard

Ovality exceeding the standard is caused by uneven cooling or external force deformation, and needs to be solved from cooling uniformity and pipe storage.

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

Bending deformation of general-purpose polyethylene extruded pipes

Pipe bending is caused by non-uniform cooling or eccentric haul-off, and needs to be solved from cooling uniformity and equipment alignment.

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

Die marks/lines on general-purpose polyethylene extruded products

Die marks are caused by die inner wall damage or impurities, and the die condition needs to be cleaned and checked regularly.

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

Process connection problems when switching production between different processing methods of general-purpose polyethylene general-purpose polyethylene

The changeover connection needs to be planned in advance and fully prepared, and the key is to clarify the differentiated requirements of different processing methods for materials.

Extrusion & Post production changeover processing method process parameters material grade trial production verification

Excessive shrinkage rate of general-purpose polyethylene extruded products

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

Die head pressure fluctuation of general-purpose polyethylene extruder

Die head pressure fluctuation is caused by unstable output or filter system problems, and the extrusion parameters need to be stabilized and the filter system maintained.

Extrusion & Post pressure fluctuation filter screen die head temperature breaker plate uniform output

Haul-off speed mismatch of general-purpose polyethylene extruded products

Haul-off speed mismatch needs to be solved by accurately adjusting the haul-off parameters and ensuring stable haul-off.

Extrusion & Post haul-off speed speed matching haul-off slipping clamping force haul-off control

Longitudinal reversion rate of general-purpose polyethylene pipes exceeding the standard

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

Unstable output/surging in general-purpose polyethylene extrusion process

Unstable output is caused by unstable solids conveying, and the barrel temperature and feeding system need to be optimized.

Extrusion & Post unstable output surging solids conveying hopper bridging screw speed

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