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Q

PPS brittleness and toughening

A

Brittleness is the first shortcoming of pure PPS; toughening modification is the necessary path for application expansion, PPA system is the mainstream route; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Material Analysis PPS; brittleness; toughening; PPA; impact

Q

PPS annealing treatment

A

Annealing is the standard post-treatment for PPS stress relief and dimensional stabilization; hidden cracks from skin-core crystallization difference are radically cured by annealing; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurr...

Extrusion & Post PPS; annealing; 160-180℃; internal stress; dimension

Q

PPS wall thickness design upper limit

A

PBT thick wall is the structural forbidden zone of PPS; 7-10mm upper limit plus holding pressure feeding, cracks remedied by annealing; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Molding Process PPS; wall thickness; 7-10mm; shrinkage cavity; internal crack

Q

PPS pinpoint gate reduces orientation

A

Gate form is a structural means of PPS orientation management; pinpoint gate radial flow is the classic solution for low warpage; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling PPS; pinpoint gate; fiber orientation; flatness; film gate

Q

PPS shrinkage and glass fiber

A

PPS shrinkage shows strong directionality due to glass fiber orientation; directional allowance is the basic skill of mold design; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Molding Process PPS; shrinkage; anisotropy; glass fiber; allowance

Q

PPS back pressure control

A

PPS back pressure is mainly low, raised as needed; when discoloration and embrittlement occur, back pressure is the first suspect parameter; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Molding Process PPS; back pressure; 0.1-1.0MPa; metering; overheating

Q

PPS screw speed upper limit

A

The essence of PPS screw low-speed is fiber preservation; shear heat and fiber breakage are the dual costs of high speed; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Processing Machinery PPS; screw speed; 40-100rpm; glass fiber; shear

Q

PPS injection pressure 50-100MPa

A

PPS pressure window 50-100MPa; staged holding pressure control is a common means of preventing flash and sink marks; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Injection Molding PPS; injection pressure; 50-100MPa; holding pressure; flash

Q

PPS injection speed medium speed

A

PPS speed strategy is medium-speed keynote plus end deceleration; the balance of shear heat and weld lines relies on segmented curves; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Injection Molding PPS; injection speed; medium speed; burnt; weld line

Q

PPS high mold temperature side effects

A

There is no free lunch with PPS mold temperature; the rigidity gained from crystallinity comes at the cost of toughness, position according to use; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling PPS; high mold temperature; crystallization; impact strength; brittle

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