Problema e solução

Respostas práticas para os desafios comuns dos materiais plásticos

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Q

PC Sheet Extrusion Bubbles

A

PC extrusion: 'water content is the first cause of bubbles, venting vacuum is the insurance': drying and venting work together; PC's hygroscopicity determines that drying must run through the entire extrusion process.

Material Drying PC; extrusion; bubble; drying; vacuum venting

Q

PC Extruded Sheet Surface Gel Particles

A

PC gel particles are first divided into two categories: 'unplasticized and contamination': the former relies on plasticization and screens, the latter on cleaning and dead-corner treatment; optical sheets have extremely high requirements for melt uniformity.

Material Analysis PC; extrusion; gel particle; screen; plasticization

Q

PC Extruded Sheet Uneven Thickness

A

PC sheet thickness relies on the three-in-one stability of 'die lip + temperature control + haul-off': optical sheets need thickness closed-loop; use the thickness curve to locate the problematic die lip section for transverse deviation and adjust it targetedly.

Extrusion & Post PC; extruded sheet; uneven thickness; die lip; haul-off

Q

PC Product Dimensional Drift

A

Precision PC parts need 'cavity pressure curve monitoring': dimensions are the result of process stability; fix the variables of cushion, mold temperature, and environment, and dimensions are naturally stable.

Molds & Tooling PC; dimensional drift; cavity pressure; mold temperature; SPC

Q

PC Gas Trapping and Burning

A

PC 'high-temperature material fears gas trapping more': venting is a life-saving design; the higher the processing temperature, the greater the risk of gas-trapping burning, and the design and maintenance of the venting system must be in place; after confirming effectiveness, solidify the paramet...

Molds & Tooling PC; gas trapping; burning; venting; diesel effect

Q

PC/ABS Weak Weld Lines

A

For PC/ABS structural parts, 'weld line position takes priority over appearance': design it into a non-stress-bearing area, then raise temperature and vent to strengthen; the weld line of structural parts is a mechanical problem and must be planned in advance.

Molds & Tooling PC/ABS; weld line; venting; strength; gate

Q

PC/ABS Flow Marks

A

PC/ABS flow marks = 'front cools too fast': raising temperature and speed is the main line; high-gloss housings have the highest requirements for front management, and the matching of speed and temperature needs repeated refinement.

Injection Molding PC/ABS; flow mark; mold temperature; injection speed; front

Q

PC/ABS Warpage

A

PC/ABS large flat part warpage = 'cooling balance + holding restraint': as an amorphous blend, stress management is the main line; large parts especially need the mold temperature field made uniform.

Molding Process PC/ABS; warpage; cooling balance; holding pressure; annealing

Q

PC/ABS Sink Marks

A

PC/ABS sink marks 'first add holding pressure, then check rib thickness': as a low-shrinkage material, sink marks mostly stem from structural wall thickness and holding pressure management; only by emphasizing both process and structure can it be radically cured.

Molds & Tooling PC/ABS; sink mark; holding pressure; rib thickness; freeze

Q

PC/ABS Blend Silver Streaks

A

PC/ABS silver streaks = three things: 'drying + temperature + regrind': the PC component needs drying, the ABS component needs temperature control, and regrind needs a limited ratio; the processing window of blends is narrower than that of single materials, and management must be more detailed.

Material Drying PC/ABS; silver streak; drying; melt temperature; regrind

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