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

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

Extrusion & Post melt flow rategrade selectionextrusion gradeprocess adjustmentbatch testing

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Sharkskin appearing on the surface of random copolymer polypropylene extruded products

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

Extrusion & Post sharkskinmelt fracturedie temperatureextrusion speeddie polishing

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Dimensions of random copolymer polypropylene injection molded products too small, below the lower limit

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

Extrusion & Post undersized dimensionsexcessive shrinkageinsufficient holding pressurepost-shrinkagegate freezing

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Dimensions of random copolymer polypropylene injection molded products too large, exceeding the upper limit

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

Extrusion & Post oversized dimensionsholding pressureshrinkage ratemold temperaturedimensional control

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Flash/burrs appearing in random copolymer polypropylene injection molded products

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

Extrusion & Post flashclamping forceinjection pressureparting linemold gap

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Dimensions of random copolymer polypropylene injection molded products too small, below the lower limit (variant: strengthened measures)

Undersized dimensions are caused by excessive shrinkage and need to be controlled by strengthening holding pressure, lowering temperature and extending cooling time. In different production scenarios, targeted preventive measures need to be taken.

Extrusion & Post undersized dimensionsexcessive shrinkageinsufficient holding pressurepost-shrinkagegate freezing

9 görüntüleme

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Dimensions of random copolymer polypropylene injection molded products too large, exceeding the upper limit (variant: strengthened measures)

Oversized dimensions are mainly caused by insufficient shrinkage; the actual shrinkage rate is controlled within the tolerance range by adjusting holding pressure and temperature parameters. In different production scenarios, targeted preventive measures need to be taken.

Extrusion & Post oversized dimensionsholding pressureshrinkage ratemold temperaturedimensional control

10 görüntüleme

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Flash/burrs appearing in random copolymer polypropylene injection molded products (variant: strengthened measures)

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

Extrusion & Post flashclamping forceinjection pressureparting linemold gap

10 görüntüleme

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Film blocking/poor anti-blocking of homopolymer polypropylene film

Film blocking is caused by surface tension and temperature; it needs to be solved by adding anti-blocking agents and controlling winding conditions.

Extrusion & Post film blockinganti-blocking agentwinding temperaturewinding tensionslip agent

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Poor transparency of homopolymer polypropylene blown film

Poor transparency is caused by high crystallinity or impurities; it needs to be improved by increasing temperature, speeding up cooling, and selecting appropriate materials.

Extrusion & Post poor transparencycrystallinitycooling ratenucleating agenthaze

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Kategoriler

Tüm Konular 11636 Material Drying 1439 Injection Molding 1506 Molding Process 740 Molds & Tooling 1506 Processing Machinery 2025 Extrusion & Post 2239 Blow Molding 315 Thermoforming 141 Material Analysis 1343 Production & Quality 382

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