Problema e solução

Respostas práticas para os desafios comuns dos materiais plásticos

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Q

HDPE film wrinkles

A

Wrinkles come from two sources: mechanical and process; first correct the mechanical alignment, then adjust the process stability, and troubleshooting in this order is efficient.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Extrusion & Post HDPE; film; wrinkles; alignment; collapsing frame; tension

Q

HDPE film longitudinal thickness fluctuation

A

Longitudinal thickness fluctuation is mostly related to mechanical transmission; for periodic fluctuation, troubleshooting the equipment components corresponding to the period is the most direct.; after confirming effectiveness, solidify the parameters and practices into the work instruction to p...

Extrusion & Post HDPE; film; longitudinal thickness; fluctuation; transmission; haul-off

Q

HDPE film blocking and poor opening property

A

Opening property is a key performance for film post-processing; the three factors of additives, temperature and cooling are managed synergistically.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Extrusion & Post HDPE; film; blocking; anti-blocking agent; slip agent; cooling

Q

HDPE film misty water marks

A

Misty water marks point to plasticization and moisture problems; attacking both temperature and drying can eliminate them.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Material Drying HDPE; film; water marks; plasticization; moisture; temperature

Q

HDPE film rough and uneven surface

A

Surface roughness should be distinguished into two categories: melt fracture and impurities; die head condition and raw material cleanliness are the two major troubleshooting directions.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent re...

Processing Machinery HDPE; film; rough surface; die head; melt fracture; impurities

Q

HDPE film poor transparency

A

Transparency is affected by both plasticization quality and crystallization state; temperature and cooling are optimized synergistically, and if necessary, solve it at the grade level.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recu...

Processing Machinery HDPE; film; transparency; haze; plasticization; cooling

Q

HDPE film bubbles and pinholes

A

Film bubbles mostly originate from moisture; check both drying and leakage prevention, and moisture content testing is a quick criterion.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Material Drying HDPE; film; bubble; pinhole; moisture; drying

Q

HDPE film poor transverse tear

A

The balance of transverse and longitudinal performance depends on the matching of blow-up ratio and draw ratio; biaxial testing is the direct method to verify the balance.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Extrusion & Post HDPE; film; transverse tear; blow-up ratio; balance; orientation

Q

HDPE film insufficient longitudinal strength

A

Longitudinal strength is jointly determined by orientation and molecular weight; draw ratio and temperature are the main process levers.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Processing Machinery HDPE; film; longitudinal strength; draw ratio; orientation; degradation

Q

HDPE film sharkskin melt fracture

A

Sharkskin is the signature defect of shear instability; the three moves of heating up, widening the gap and PPA can quickly eliminate it, and adjust the resin if necessary.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Processing Machinery HDPE; film; sharkskin; melt fracture; die gap; PPA

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