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Practical answers to common plastic material challenges

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Q

PTFE Dimensional Shrinkage Out of Tolerance

A

PTFE's 15~20% shrinkage is an inherent characteristic of the powder metallurgy-type process; mold compensation design is the premise of dimensional accuracy; filled modification is a material means to reduce shrinkage.

Extrusion & Post PTFE;shrinkage;dimensions;sintering;compensation;filling

Q

PTFE Poor Surface Finish

A

PTFE surface quality is critical for sealing and friction applications; tool sharpness is the foundation on the machining side; mold cleanliness transfer is a detail on the molding side.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Extrusion & Post PTFE;surface;scratches;tools;lubricant;mold

Q

PTFE Cracking and Fracture

A

PTFE cracking requires cooling management, filler balance, and handling protection together; filler reinforcement and toughness trade off against each other; machining force control is a detail.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent...

Material Analysis PTFE;cracking;fracture;cooling;filler;machining

Q

PTFE Warpage and Distortion

A

Thermal management and wall thickness design are equally important for PTFE warpage; 15~20% sintering shrinkage is the baseline data for process design; annealing is an effective post-treatment means.

Molding Process PTFE;warpage;distortion;thermal gradient;shrinkage;annealing

Q

PTFE Excessive Porosity

A

PTFE porosity is the common enemy of mechanical strength and sealing performance; degassing and compaction are the two lines of defense for prevention; lubricant management is a unique subject of paste extrusion.

Extrusion & Post PTFE;porosity;voids;compaction;degassing;sintering

Q

PTFE Sintering Opacity

A

PTFE sintering opacity is a signal of insufficient temperature and time; but the premise of adjustment is resin thermal stability; transparency verification should be included in inspection.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent rec...

Material Analysis PTFE;sintering;opacity;temperature;holding;thermal stability

Q

PTFE Sintering Deformation

A

PTFE sintering deformation is directly related to crystallinity management; cooling rate is an important parameter affecting physical properties; furnace temperature uniformity needs multi-point temperature measurement guarantee.

Production & Quality PTFE;sintering deformation;holding;cooling rate;crystallinity;furnace temperature

Q

PTFE Sintering Cracks

A

Thermal stress management for PTFE sintering cracks runs through the entire heating, holding, and cooling process; the slow-speed principle for large products is a rigid constraint; demolding protection is an often-overlooked detail.

Molds & Tooling PTFE;sintering cracks;heating rate;thermal stress;demolding;pressure release

Q

PTFE Compression Molding Inaccurate Dimensions

A

PTFE dimensional accuracy depends on the uniformity of pressure transfer; feeding and leveling is a simple but critical action; the matching relationship between pressure and holding pressure time must be followed.; After confirming effectiveness, fix the parameters and practices into the work in...

Molds & Tooling PTFE;inaccurate dimensions;uneven pressure;feeding;holding pressure;molecular weight

Q

PTFE Compression Molding Discoloration and Dents

A

Tracing PTFE discoloration and dents must consider both raw material purity and pressing method; double-side pressing is the structural guarantee of uniformity; operational cleanliness is detail management.; After confirming effectiveness, fix the parameters and practices into the work instructio...

Production & Quality PTFE;discoloration;dent;impurities;double-side pressing;feeding

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