Problema e solução

Respostas práticas para os desafios comuns dos materiais plásticos

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Q

PVC Injection Weak Weld Line

A

PVC weld line = 'temperature + venting + anti-degradation': PVC melt has high elasticity and converges with difficulty, temperature and venting must be given sufficiently, and more importantly prevent degraded flow front from making the weld line brittle.

Injection Molding PVC; '2079851475616104452; weld line; venting; degradation

Q

PVC Injection Flash

A

PVC flash 'also beware of degradation-induced viscosity drop': degradation makes PVC suddenly thin and flash; besides reducing pressure and increasing clamping, check back whether thermal degradation caused abnormal viscosity.

Injection Molding PVC; '2079851475616104452; flash; clamping; degradation

Q

PVC Injection Short Shot

A

PVC short shot = 'the pressure-temperature account of high viscosity': raise temperature and pressure within the safe window; PVC is heat-sensitive, heating must be cautious — large gates and venting are often safer and more effective than forced heating.

Injection Molding PVC; '2079851475616104452; short shot; viscosity; pressure

Q

PVC Foam Board Uneven Cells

A

PVC foam board = 'rhythm matching of plasticization and foaming': foaming agent decomposition and plasticization progress must be synchronized; temperature field uniformity and foam regulator are the two pillars of uniform cells.

Processing Machinery PVC; foam board; cell; foaming agent; plasticization

Q

PVC Cable Compound Color Drift

A

PVC cable compound color difference = 'heat history management': PVC base color drifts with heat history, color matching should reserve for base color change; batch consistency is the lifeline of cable compound.

Molding Process PVC; cable compound; color difference; heat history; stabilizer

Q

PVC Wire and Cable Compound Surface Particles

A

PVC cable compound particles = 'dispersion + filtration': filler dispersion and screen integrity are the two key passes; cable compound has high surface smoothness requirements, dispersion and filtration must both be in place.

Processing Machinery PVC; cable compound; particle; dispersion; screen pack

Q

PVC Film Gel and Specks

A

PVC film surface spots = 'plasticization + dispersion + dead corners': plasticization and additive dispersion are the main line, dead corner burnt material is the hidden danger; film has the highest uniformity requirement, plasticization must be excessive.

Extrusion & Post PVC; film; gel; plasticization; dead corner

Q

PVC Transparent Sheet Gel Particles

A

PVC transparent sheet gel particles = 'resin fish-eyes + plasticization': many fish-eyes in the resin itself and insufficient plasticization are the two sources; transparent sheet must be controlled from both resin selection and plasticization process.

Production & Quality PVC; transparent sheet; gel particle; fish-eye; resin

Q

PVC Profile Dimension Fluctuation

A

PVC profile dimension fluctuation = 'extrusion + haul-off + calibration' three-stability problem: first stabilize extrusion output, then synchronize haul-off, finally calibrate the calibration; the matching degree of the three determines dimensional accuracy.

Extrusion & Post PVC; profile; dimension fluctuation; haul-off; vacuum calibration

Q

PVC Profile Surface Streaks

A

PVC streaks = 'die condition + plasticization uniformity': buildup shedding, die damage, poor plasticization are the three sources; the regularity of streaks can infer whether it is periodic buildup or persistent damage.

Extrusion & Post PVC; profile; streak; die; plasticization

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