Yesterday was the first day of the college entrance examination, after all the candidates today, Panasonic can breathe a sigh of relief. But what about this matter? Think about the work I still work hard, today we introduce the plastic mold in the purpose of heating and cooling.
Thermosetting plastics require higher mold temperatures to facilitate cross-linking reactions
Some thermoplastics also need to maintain more than 80 degrees of mold temperature, such as polyoxymethylene, polyphenylene ether
large mold to warm up
Hot runner molds are widely used
The molding cycle is mainly dependent on the cooling setting time (about 80%), by reducing the mold temperature to shorten the cooling time, is to improve production efficiency of the key.
Mold temperature is too low
plastic fluidity is poor, plastic parts contour is not clear, the surface dull;
Thermosetting plastics are insufficiently cured and have deteriorated significantly.
Mold temperature is too high
easy to cause flash material sticky mold, plastic parts stripping difficult, large deformation;
Thermoset plastics are too familiar.
Core temperature difference is too large, plastic parts shrink uneven, increased internal stress, plastic deformation, size instability.
Note: The above information from the Jiezheng mold on the Internet, welcome reproduced, indicate the source!