Problem & Solution

Q

Melt flow rate mismatch of raw material for low density polyethylene extrusion

A

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

Extrusion & Post melt flow rategrade selectionextrusion gradeprocess adjustmentbatch testing

Q

Uneven wall thickness of low density polyethylene extruded pipes

A

Uneven wall thickness is caused by uneven die gap or uneven temperature; it needs to be solved from mold accuracy and temperature uniformity.

Extrusion & Post uneven wall thicknessdie concentricitytemperature uniformityhaul-off stabilitysizing sleeve

Q

Insufficient long-term hydrostatic strength of low density polyethylene PPR pipes

A

Insufficient long-term hydrostatic strength is caused by material selection and processing quality; comprehensive control of raw material, process, and welding is needed.

Extrusion & Post hydrostatic strengthPPRmolecular weightpipe wall thicknesscrystallinity

Q

Sharkskin on the surface of low density polyethylene extruded products

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.

Extrusion & Post sharkskinmelt fracturedie temperatureextrusion speeddie polishing

Q

Bamboo pattern/melt fracture on the surface of low density polyethylene extruded products

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.

Extrusion & Post melt fracturebamboo patterncritical shear ratedie temperatureextrusion speed

Q

Low density polyethylene injection products with undersized dimensions below the lower limit

A

Undersized dimensions are caused by excessive shrinkage; the shrinkage rate needs to be controlled by strengthening holding pressure, lowering temperature, and extending cooling time.

Extrusion & Post undersized dimensionexcessive shrinkageinsufficient holding pressurepost-shrinkagegate freezing

Q

Injection molded low density polyethylene products with oversized dimensions exceeding the upper limit

A

Oversized dimensions are mainly caused by insufficient shrinkage; control the actual shrinkage rate within the tolerance range by adjusting holding pressure and temperature parameters.

Extrusion & Post oversized dimensionholding pressureshrinkage ratemold temperaturedimension control

Q

Flash/Burrs Appearing on Low-Density Polyethylene Injection Molded Products

A

Flash is a manifestation of the mismatch between the mold clamping force and the injection pressure, and needs to be controlled from three aspects: clamping force, injection pressure, and mold precision.

Extrusion & Post flashclamping forceinjection pressureparting linemold gap

Q

Flash/Burrs Appearing on Low-Density Polyethylene Injection Molded Products (Variant: Strengthened Measures)

A

Flash is a manifestation of the mismatch between the mold clamping force and the injection pressure, and needs to be controlled from three aspects: clamping force, injection pressure, and mold precision. Targeted preventive measures need to be taken in different production scenarios.

Extrusion & Post flashclamping forceinjection pressureparting linemold gap

Q

Unstable Cooling Line Height of High-Density Polyethylene Film

A

Unstable cooling line is caused by fluctuations in cooling or extrusion conditions, and the air ring parameters and environmental conditions need to be stabilized.

Extrusion & Post cooling linefrost lineair ring stabilityextrusion temperatureenvironmental airflow

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