Problem & Solution

Practical answers to common plastic material challenges

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Q

HDPE film uneven winding

A

Winding quality is the final embodiment of all deviations in the preceding processes; tension management and thickness uniformity are equally important.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Extrusion & Post HDPE; film; winding; tension; staggered layers; taper

Q

HDPE film uneven corona treatment

A

Corona uniformity affects the quality of printing and lamination; electrode calibration and thickness control are equally important.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Extrusion & Post HDPE; film; corona; adhesion; dyne value; printing

Q

HDPE film thick ears

A

Thick ears are a manifestation of the edge effect; edge temperature control and structural compensation can effectively flatten the thickness difference.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Extrusion & Post HDPE; film; ears; thick edges; die lip; edge

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 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 strain hardening

A

Strain hardening is an extensional rheology problem; reducing the stretching load and adjusting the material rheological properties are two solution paths.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Extrusion & Post HDPE; film; strain hardening; draw ratio; wrinkles; rheology

Q

HDPE film bubble breakage

A

Film breakage indicates that the stretching exceeds the limit the melt can withstand; reduce the load and stabilize the process first, then gradually optimize the output.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Extrusion & Post HDPE; film; film breakage; blow-up ratio; melt strength; extrusion output

Q

HDPE film uneven thickness

A

Thickness uniformity is the core indicator of film; the uniformity coordination of the die gap and air ring plus the online thickness measurement closed loop is the guarantee of stability.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent ...

Extrusion & Post HDPE; film; thickness; die gap; air ring; thickness measurement

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