Problem & Lösung

Praktische Antworten auf häufige Herausforderungen mit Kunststoffmaterialien

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Q

PE Film Wrinkles and Poor Winding

A

Eighty percent of PE film winding problems come from the film's own thickness unevenness: first get the thickness deviation and centering right, then adjust the tension taper; talking about winding on a film with uneven thickness will never wind well.

Extrusion & Post PE;film;wrinkles;winding;tension taper;centering

Q

PE Film Splitty and Weak Edges

A

PE film splitting = 'orientation imbalance', and the core is adjusting the matching of the blow-up ratio and draw-down ratio; weak edges are a knife and tension problem—do not confuse the two and adjust the process randomly.

Processing Machinery PE;film;splitting;blow-up ratio;orientation;slitting

Q

PE Film Poor Heat Sealing

A

For PE heat sealing, first determine the temperature window according to the grade melting point, then check the film surface condition and heat seal layer thickness; slip agent is a double-edged sword, requiring both opening and sealing performance, and the dosage must be weighed.

Material Analysis PE;film;heat sealing;seal strength;slip agent;melting point

Q

PE Film High Haze and Poor Transparency

A

PE film haze: 'adjust crystallization internally, adjust the surface externally': rapid cooling refines the grains to reduce internal haze, and eliminating melt fracture reduces external haze; for high-transparency requirements, go directly to metallocene grades, which is more effective than forc...

Material Analysis PE;film;haze;crystallization;melt fracture;metallocene

Q

PE Film Blocking and Poor Opening

A

Film blocking = three controls of 'additive + tension + temperature': additives manage the surface, tension manages the contact pressure, temperature manages blooming and creep; too much slip agent affects lamination, and the dosage must be carefully balanced according to the final application.

Extrusion & Post PE;film;blocking;anti-blocking agent;slip agent;winding tension

Q

PE Film Thickness Deviation

A

PE film thickness is managed by direction: for MD check the stability of extrusion and haul-off, for TD check the symmetry of the die lip and temperature/air ring; closed-loop thickness measurement is standard, and adjusting the die lip by hand feel has long been unable to keep up with the qualit...

Extrusion & Post PE;film;thickness deviation;MD;TD;die lip;air ring

Q

PE Blown Film Bubble Instability

A

Bubble stability = 'stable extrusion + uniform air ring + still airflow': first suppress the extrusion fluctuations, then even out the air ring, and finally manage the environment; when the LLDPE bubble is unstable, blending to increase the melt strength often works immediately.

Extrusion & Post PE;blown film;bubble instability;air ring;melt strength;blending

Q

LLDPE Blown Film Sharkskin and Melt Fracture

A

LLDPE sharkskin = 'high viscosity meeting high shear'; PPA is the standard solution, and raising the temperature and reducing the speed is the foundation; when pursuing output, the sharkskin critical line speed is the capacity ceiling, which must be systematically solved rather than forcibly rais...

Extrusion & Post LLDPE;blown film;sharkskin;melt fracture;PPA

Q

PE Film Gels and Fisheyes

A

Troubleshoot PE film gels in the three categories of 'unplasticized/cross-linked/contaminated': plasticization and screen pack are the main line, dead corners and regrind are hidden dangers; film is a magnifying glass of melt uniformity, and plasticization must be more than sufficient.

Extrusion & Post PE;film;gel;fisheye;plasticization;screen pack

Q

PE Product ESCR Environmental Stress Cracking

A

ESCR is the most common cause of 'premature death' of durable PE products: material grade, internal stress and media must superimpose to cause failure; blow molded household chemical bottles and industrial drainage pipes are disaster areas, and material selection and verification must be moved up...

Extrusion & Post PE;HDPE;ESCR;stress cracking;media;grade

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