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Practical answers to common plastic material challenges

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Q

LDPE Film Bubble Low-temperature Sagging

A

Frost line position is the result of the balance between cooling and output; when it exceeds the limit, choose either reducing output or increasing cooling.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Extrusion & Post LDPE; film; frost line; cooling; internal cooling; extrusion output

Q

LDPE Film Unstable Melt Pressure and Thickness Fluctuation

A

Pressure stability is the prerequisite for thickness stability; melt pressure monitoring is the most direct stability indicator.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; Incorporate this case into the defect archive as...

Extrusion & Post LDPE; film; melt pressure; fluctuation; thickness; melt pump

Q

LDPE Film Longitudinal Thickness Fluctuation

A

The periodic characteristics of longitudinal fluctuation correspond to specific equipment components; back-tracing by period is the fastest locating method.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Extrusion & Post LDPE; film; longitudinal thickness; fluctuation; motor; 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

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

Q

LDPE Blown Film Bubble Breakage

A

For bubble breakage, first find the source of the weak spots.

Extrusion & Post LDPE; blown film; bubble breakage; gel; air ring

Q

LDPE Extrusion Temperature Fluctuation

A

For temperature fluctuation, check the sensor and actuator first.

Extrusion & Post LDPE; extrusion; temperature fluctuation; thermocouple; PID

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