Problema e solução

Respostas práticas para os desafios comuns dos materiais plásticos

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Q

PBT Voids and Sink Marks

A

The difficulty of PBT voids and sink marks lies in fast solidification and a short window; precise holding and structural thinning are used together; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Molding Process PBT; void; sink mark; holding pressure; fast solidification

Q

PBT Surface Peeling

A

The number one suspect of PBT surface peeling is contamination; regrind management and barrel cleanliness are the defense line; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Extrusion & Post PBT; surface peeling; contamination; regrind; plasticization

Q

PBT Matte Surface Poor Gloss

A

PBT's spray-free advantage needs to be delivered by the process; the three elements of temperature, polishing, and drying determine surface gloss; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Material Drying PBT; matte surface; gloss; spray-free; mold temperature

Q

PBT Cold Material Jetting Marks

A

PBT jetting marks are investigated along two lines: nozzle temperature and gate; the cold slug well is the interception means on the structure side; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling PBT; jetting mark; cold material; nozzle temperature; gate

Q

PBT Gas Burning

A

PBT gas burning gives priority to venting; PBT's characteristic of heavy mold deposit makes vent cleaning a high-frequency maintenance item; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling PBT; gas burning; venting; mold deposit; speed reduction

Q

PBT Dark Weld Line

A

PBT dark weld line treatment gives priority to temperature and speed; position transfer and overflow wells are mold-side countermeasures; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling PBT; dark weld line; weld line; gate; overflow well

Q

PBT Black Specks and Burning

A

PBT black specks and burning are investigated along three lines: temperature, residence, and nozzle; PE/PP cleaning at shutdown is an iron rule to prevent carbonization; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Processing Machinery PBT; black speck; burning; residence; cleaning

Q

PBT Draft Angle and Forced Demolding

A

PBT demolding design is differentiated according to whether it is filled or not; the forced demolding capability of pure material no longer exists in glass fiber grades; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling PBT; draft angle; forced demolding; elongation; glass fiber

Q

PBT Vent Slot 0.02mm

A

PBT venting is precision work at the 0.02mm level; the window between gas trapping and overflow is guaranteed by mold precision; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling PBT; vent slot; 0.02mm; overflow; burning

Q

PBT Hot Runner Forbidden Zone

A

The hot runner is a process forbidden zone for PBT; the two major risks of low-viscosity drooling and manifold degradation are superimposed; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling PBT; hot runner; forbidden zone; degradation; drooling

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