Another main use of copper nuts is injection molding, which is embedded in plastic parts after heating or direct mold injection. As mentioned above, brass has good thermal conductivity. For example, copper nuts are embedded after heating. On the one hand, copper nuts It can quickly heat up and speed up the work efficiency. On the other hand, the heated copper nut can quickly conduct heat to the plastic parts, so that the periphery of the plastic hole becomes soft and is easy to be pressed into the hole; then, if the mold injection effect will be used What if? As we all know, the melting point of PA / NYLOY / PET is above 200 ° C. The temperature of the copper nut is quickly increased after being melted into the plastic part. After injection molding, the plastic body quickly cools and crystallizes. If the temperature of the copper nut is still high, What will the result be? You must have guessed it cleverly, and the result is that the place where the copper nut comes into contact with the plastic part is loose or cracked. Therefore, copper nuts are used instead of steel nuts in injection molding.
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