Thermoset Injection Mold Design Tips Plenco（Plenco热固性注射模具设计技巧）.pdf

3518 LAKESHORE ROAD P L A S T I C S E N G I N E E R I N G C O M P A N Y POST OFFICE BOX 758 S H E B O Y G A N , W I S C O N S I N 5 3 0 8 2 - 0 7 5 8 U . S . A PHONE 920 - 458 - 2121 F A X 920 - 458 - 1923 Thermoset Injection Mold Design Tips When designing a mold for an injection molded part, it is important to keep in mind that the goal is to produce parts with the best quality, at the best cycle possible, with minimum scrap. To achieve this goal, you will need a mold that has a uniform mold temperature, balanced fill, is properly vented and is designed to dimensionally compensate for material shrinkage in all axis. Mold Heating A uniform mold temperature means that the temperature of each half of the mold is within +/- 5°F (3°C) for all locations when the mold is heated by oil or steam. Molds that are heated with electric cartridge heaters can vary by as much as 10°F (6°C). A mold with a uniform temperature will fill easier and produce parts with less warpage, improved dimensional stability and have a uniform surface appearance. Achieving a uniform mold temperature is dependent on the method of mold heating. A mold that is correctly designed and heated by steam or oil will have a uniform mold temperature because the heat source maintains a constant temperature. However, oil as a heat source is only about half as efficient as steam. Therefore, when using oil to heat a mold, it is necessary to set the oil temperature higher than the desired mold temperature. Electrically heated molds are more difficult to maintain a uniform temperature because the cartridge