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Q

PSU Characteristic of Hard-to-eliminate Internal Stress

A

PSU internal stress is inherently hard to eliminate; hot mold plus annealing are standard procedures; After confirming effectiveness, solidify the parameters and practices into the work instructions to prevent recurrence; Include this case in the defect archive as a reference for troubleshooting ...

Processing Machinery internal stress stress cracking annealing solvent

Q

PSU Melt Fracture and Filling Speed

A

PSU speed increase has a melt fracture ceiling; filling relies on temperature, not brute-force speed increase; After confirming effectiveness, solidify the parameters and practices into the work instructions to prevent recurrence

Injection Molding melt fracture injection speed shear upper limit filling

Q

PSU Notch Sensitivity and Fillet Design

A

PSU is notch sensitive; fillet transition is a mandatory item in structural design; After confirming effectiveness, solidify the parameters and practices into the work instructions to prevent recurrence; Include this case in the defect archive as a reference for troubleshooting similar problems i...

Processing Machinery notch sensitivity fillet stress concentration cracking

Q

PSU Wall Thickness Lower Limit and Flow Length Ratio

A

PSU wall thickness 1.5mm is a design red line; flow length ratio 80 determines gate layout; After confirming effectiveness, solidify the parameters and practices into the work instructions to prevent recurrence

Molding Process wall thickness lower limit flow length ratio multiple gates short shot

Q

PSU Nozzle Selection and Heating

A

PSU nozzles need extended heating and large orifice; >5mm does not drool but instead prevents blockage; After confirming effectiveness, solidify the parameters and practices into the work instructions to prevent recurrence

Processing Machinery nozzle extended type orifice cold slug

Q

PSU Screw Configuration and Rotation Speed

A

PSU screws need low compression ratio L/D 14-20 paired with 15-45rpm low-speed plasticization; After confirming effectiveness, solidify the parameters and practices into the work instructions to prevent recurrence

Injection Molding screw configuration low compression ratio rotation speed plasticization

Q

PSU Barrel Temperature 400°C-level Control

A

PSU barrels require 400°C-level stable temperature control, which ordinary machines cannot manage; After confirming effectiveness, solidify the parameters and practices into the work instructions to prevent recurrence; Include this case in the defect archive as a reference for troubleshooting sim...

Injection Molding barrel temperature 400°C temperature control accuracy machine selection

Q

PSU Melt Temperature and Viscosity Steep Slope

A

PSU viscosity halves every 30°C; make good use of the steep slope but hold the degradation upper limit; After confirming effectiveness, solidify the parameters and practices into the work instructions to prevent recurrence

Material Analysis melt temperature viscosity steep slope filling degradation

Q

PSU Trace Moisture High-temperature Degradation

A

Low water absorption of PSU does not mean water-tolerant processing; even trace water degrades under high-temperature shear; After confirming effectiveness, solidify the parameters and practices into the work instructions to prevent recurrence

Material Drying trace moisture melt degradation high temperature shear

Q

PSU Can Be Stored Long-term at 135°C Without Over-drying

A

There is no such thing as over-drying for PSU; a week at 135°C is safe; only insufficient drying is to be feared; After confirming effectiveness, solidify the parameters and practices into the work instructions to prevent recurrence

Material Drying over-drying 135°C material storage drying time hopper

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