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Q

PC Thin-Wall Part Flow End Burning

A

PC thin-wall 'high-speed process must match venting capacity': the faster the speed, the more the venting must be in place; the venting design of thin-wall parts must be front-loaded, do not wait until burning occurs to fix it.

Molds & Tooling PC; thin wall; burning; venting; high-speed filling

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 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 Hot Runner Gate Stringing

A

For PC stringing, check 'hot runner temperature control and valve pin action': temperature and timing are the two major variables; the state of the hot runner system directly determines gate quality and must be included in regular inspection.

Molds & Tooling PC; hot runner; stringing; valve pin; gate cooling

Q

PC Black Specks (Carbonized Spots)

A

Transparent PC's tolerance for black specks is zero: dead-corner treatment must be normalized and institutionalized; intermittent black specks are a typical feature of dead-corner carbon deposits, and purging is far more effective than adjusting the process.

Molds & Tooling PC; black speck; carbonization; hot runner; purging

Q

PC Sticking to Mold (Demolding Difficulty)

A

PC has large demolding resistance, and mold draft and polishing must meet higher standards: reduce pressure and temperature to reduce gripping, draft and polishing to reduce resistance, deep cavities to prevent vacuum; PC's demolding margin design must be stricter than general-purpose materials.

Molds & Tooling PC; mold sticking; draft angle; polishing; holding pressure

Q

PC Ejector Whitening and Ejector Cracking

A

PC ejector whitening and cracking = 'large gripping force + concentrated force': first disperse the ejection force, then extend cooling, and finally reduce holding pressure; PC is both rigid and brittle, and the design margin of the ejection system must be larger than for general-purpose materials.

Molds & Tooling PC; ejector whitening; ejector cracking; ejector pin; holding pressure

Q

PC Sink Marks

A

PC sink marks are treated from both ends of 'structural wall thickness and holding feeding': rib thickness and thick walls are the root, holding and freeze are the technique; sink marks on transparent parts are also optical defects, and wall thickness must be controlled from the design stage.

Molds & Tooling PC; sink mark; holding pressure; rib; freeze

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