PBT 733LD--When using the oven dryer, the resin should be spreadon the tray with a thickness of about 1 inch. For large particlerecycled materials, the retention time should be increased to 4-6hours. In order to avoid excessive heat accumulation, it issuggested that the drying time of materials should not exceed 48hours. When using the automatic system, always use hot air totransfer the pre dried materials to the hopper, so as to minimizewater absorption. It is recommended that the amount of material inthe hopper should not exceed that used for half an hour production.Hopper cover shall be kept closed to avoid moisture absorption ofresin. Melt temperature: in order to obtain the appropriate melttemperature, the barrel temperature distribution should be set, andthe temperature from hopper to machine nozzle should graduallyincrease. It is recommended that the melt temperature range ofenduran resin is 260-277 ° C.
Long term high heat condition shall be avoided to reduce thechance of material degradation. A relatively small increase inscrew RPM will result in a large increase in melt temperature,while the control setting does not change. It is recommended to usea hand-held pyrometer to measure the melt temperature. Thismeasurement shall be performed on the thermoplastic melt after themachine has started cycling. The control of mold temperature isvery important, so it must be checked regularly. Mold temperaturehas a great influence on the following parameters: surfaceappearance, size, shrinkage, warpage, crystallization speed,molding stress, and thermal behavior of injection molded parts.
要使模塑制件获得zui佳的光泽度，应使模具表面温度保持在66-93°C。冷模具还会导致其它表面缺陷的产生，连枝和条纹，在注塑深颜材料时，更是如此。模具变冷时，还会降低结晶性，并使表面光洁度变差。这两方面因素会产生污斑的负作用。对于像ENDURAN树脂这样的半结晶材料，模具温度高会引起较高程度的模塑结晶，这样，可望得到高收缩量值。另一方面，模具温度太低，会造成模塑后结晶，制件使用时，存在翘曲变形的危险。
