Problem & Solution

Practical answers to common plastic material challenges

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Q

Poor LDPE Film Transparency

A

Transparency is determined jointly by plasticizing and cooling; adjust the process first and then evaluate material change, to avoid unnecessary cost increases.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Processing Machinery LDPE; film; transparency; haze; temperature; cooling

Q

LDPE Film Bubbles

A

Film bubbles point directly to moisture management; drying and leak prevention correspond to raw material and equipment sources respectively.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Material Drying LDPE; film; bubble; moisture; drying; leakage

Q

Poor LDPE Film Transverse Tear

A

Transverse-longitudinal balance is the basic goal of film design; blow-up ratio adjustment combined with resin modification can quickly correct the imbalance.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Processing Machinery LDPE; film; transverse tear; blow-up ratio; LLDPE; balance

Q

Insufficient LDPE Film Longitudinal Strength

A

Longitudinal strength is built by haul-off orientation; temperature and cooling work together to ensure molecular weight and crystallization quality.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Processing Machinery LDPE; film; longitudinal strength; draw ratio; orientation; frost line

Q

LDPE Film Blocking and Difficult Opening

A

Opening property is a hard requirement for bag making; combined adjustment of additives and process can balance efficiency and opening property.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Extrusion & Post LDPE; film; blocking; anti-blocking agent; temperature; cooling

Q

Improper LDPE Film Blow-up Ratio

A

The blow-up ratio is the knob for distributing transverse and longitudinal performance; only by tuning it together with the draw ratio can balanced mechanical properties be obtained.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurr...

Processing Machinery LDPE; film; blow-up ratio; transverse strength; orientation; stability

Q

LDPE Film Transverse Thickness Non-uniformity

A

Transverse thickness is guaranteed by the uniformity of the die gap and air ring; closed-loop automatic thickness measurement is standard equipment for wide film.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Extrusion & Post LDPE; film; uneven thickness; die gap; air ring; thickness measurement

Q

LDPE Film Gel Particles and Gels

A

Gel particle control relies on three defense lines: plasticizing, filtration, and cleanliness; for high-end packaging film, it is recommended to use finer screens and shorten the replacement cycle.; After confirming effectiveness, solidify the parameters and practices into the work instruction to...

Extrusion & Post LDPE; film; gel particle; gel; screen; plasticizing

Q

LDPE Blown Film Melt Fracture Sharkskin

A

Sharkskin is the surface manifestation of shear instability; raising temperature, widening the gap, and adding additives are quick countermeasures, while adjusting resin rheological properties is the fundamental solution.; After confirming effectiveness, solidify the parameters and practices into...

Extrusion & Post LDPE; blown film; sharkskin; melt fracture; die lip; PPA

Q

Delamination of LDPE Injection Molded Products

A

Delamination = contamination and compatibility.

Extrusion & Post LDPE; '2079851475616104452; delamination; contamination; compatibility

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