Mottled/grayish-white color of the product after sintering (unsintered PTFE powder residue)

Grayish-white powdery granular areas appear on the surface of PTFE sintered parts. This problem is relatively common in sintering molding production and needs to be comprehensively analyzed and solved from multiple aspects of material, process, and equipment.

(1) Temperature parameter aspect: The powder in this area does not reach the melting temperature; temperature deviations directly affect the physical and chemical state of the material and the reaction process. (2) Mold aspect: It may be that the powder locally bridges in the mold, resulting in low density and poor heat conduction at that location; the mold structure or state directly affects the flow and molding of the material in the cavity. (3) Material aspect: Fluctuations in raw material performance indicators or insufficient pretreatment affect molding quality. (4) Process aspect: Deviations in the control of key process parameters cause the '2079851475616104453 to deviate from optimal conditions. (5) Equipment aspect: Equipment accuracy and maintenance status affect the stable execution of process parameters.

(1) Implementation measure: Ensure uniform filling of the powder, formulate specific operation plans in combination with actual production conditions, and verify the implementation effect. (2) Parameter adjustment: Appropriately increase the sintering temperature or extend the holding time; it is recommended that each adjustment be 5-10℃, while monitoring product quality changes to avoid new defects caused by excessively high temperature. (3) Implementation measure: Improve the powder flowability., formulate specific operation plans in combination with actual production conditions, and verify the implementation effect. (4) Preventive measure: Establish a sound process control standard and quality inspection system, and regularly review process data for continuous optimization.

This problem needs to be comprehensively analyzed from multiple dimensions of material, process, equipment, and operation, and solved by systematically optimizing process parameters and the quality control system.