When parts molded with Pet Preform have melting temperatures of 400°F and 480°F, they have better impact resistance, have shorter mold cycle times, and consume less during plastic molding. energy.
*Examples provided by plastic technology
In plastic molding, improper mold temperatures can cause defects such as mold warpage, dent marks, and jetting.
Mold temperature effects…
Depending on the type of resin used, mold temperature can affect performance, for example:
Mold temperature problem
Mold temperature is inconsistent
Mold temperature is inconsistent with part cavity proximity
Example of the effect of mold temperature on parts
When parts molded in polycarbonate have a higher molding temperature, they will have a lower level of molding stress, which results in increased resistance to stress cracking, impact and fatigue.
Plastic molding melt temperature and mold temperature considerations
It is important to understand how the melt temperature and mold temperature work together to produce the final part characteristics.
In most cases, a lower melt temperature plus a higher mold temperature will result in the best performance.
However, many push-button plastic injection molding machines do not have the technical expertise to implement and monitor the two key aspects of plastic molding. Instead, they believe that high melt temperatures are the only solution to reduce the viscosity of the resin.
Higher melt temperatures can cause…
Unfortunately, higher melt temperatures can result in:
Longer cooling cycle
Increased energy consumption
These plastic molds are now forced to lower the mold temperature to recover the lost productivity due to the long cooling cycle caused by higher melt temperatures. This ratio of high melt temperature to low mold temperature often results in impaired component performance and component instability.
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