塑胶件为什么成型不良以及原因（Why and why bad plastic molding）.docVIP

塑胶件为什么成型不良以及原因（Why and why bad plastic molding） The plastic why bad shape and reason of Web site: /news/2011100562.html Plastic molding and bad reasons A lack of material (molding defects) reason: 1, the lack of pressure injection rays; 2, insufficient feeding, small amount of plastic molding cycle, abnormal; 3, the mold runner design is improper; 4, poor exhaust; The 5 Suzhou Kunming injection, injection pressure is too low; 6, the injection rate is low; 7, barrel, low mold temperature; 8, the material itself illiquid (such as melt index, rigid mold additives etc.). Two, shrink and deformation: 1, demoulding force is not uniform; 2, the forming time is too fast, improper cooling; Injection molding machine 3, the mold gate is set properly; 4, in the mold cooling time, deformation, shrinkage; 5, the injection pressure is too high, poor finish injection molding surface grinding, small draft; 6, improper packing pressure. The three reason, flash: 1, the injection pressure is too large; 2, mould aging, surface precision injection workshop poor site management; 3, lack of mold molding machine clamping pressure; 4, the molding conditions error adjusting machine. Four, no finished surface finish: 1peek injection mold, mold plating or poor polishing; 2, the mold temperature is too low; 3, the use of raw materials in itself is not easy to shine now; 4, poor exhaust. High temperature of injection molding of Shenzhen five, shot mark: 1, the material is not fully dry; 2, forming improper operation conditions; 3, runner or gate error. Six, the bonding wire injection: theoretical papers 1, the injection pressure is insufficient; 2, poor exhaust; 3, injection pressure formed too late; 4, the gate location is improper, too small; 5, the material mix design of injection mold material; 6, the material flow difference. Seven, shrink hole, bubble, silver lines (color, dot pattern): 1, the injection pressure is insufficient; 2, injection theoretical papers too slow; 3, intermittent inje