Problem & Solution

Q

Melt Flow Rate Mismatch of Raw Material for Block Copolymer Polypropylene Extrusion

A

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

Extrusion & Post melt flow rategrade selectionextrusion gradeprocess adjustmentbatch testing

Q

Sharkskin Texture Appearing on the Surface of Block Copolymer Polypropylene Extruded Products

A

Sharkskin texture 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

Dimensions of Block Copolymer Polypropylene Injection Molded Products Too Small Exceeding the Lower Limit

A

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

Extrusion & Post undersized dimensionsexcessive shrinkageinsufficient holding pressurepost-shrinkagegate freezing

Q

Dimensions of Block Copolymer Polypropylene Injection Molded Products Too Large Exceeding the Upper Limit

A

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

Extrusion & Post oversized dimensionsholding pressureshrinkage ratemold temperaturedimension control

Q

Flash/Burrs Appearing on Block Copolymer Polypropylene 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

Dimensions of Block Copolymer Polypropylene Injection Molded Products Too Small Exceeding the Lower Limit (Variant: Strengthened Measures)

A

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

Extrusion & Post undersized dimensionsexcessive shrinkageinsufficient holding pressurepost-shrinkagegate freezing

Q

Dimensions of Block Copolymer Polypropylene Injection Molded Products Too Large Exceeding the Upper Limit (Variant: Strengthened Measures)

A

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

Extrusion & Post oversized dimensionsholding pressureshrinkage ratemold temperaturedimension control

Q

Flash/Burrs Appearing on Block Copolymer Polypropylene 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 Polypropylene Film

A

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

Extrusion & Post cooling linefrost lineair ring stabilityextrusion temperatureenvironmental airflow

Q

Gel Particles/Gel Granules Appearing in Polypropylene Film

A

Gel particles are caused by insufficient plasticization or raw material quality problems, and need to be solved from temperature control and raw material quality.

Extrusion & Post gel particlegelplasticizing temperaturescrew mixingfilter screen

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