We insert breathable films into the mold and attach the breathable films to plastic products. The breathable film reduces pressure differences caused by heat generation inside the ECU to prevent absorption of moisture during depressurization.

＜Merit＞
　1.This allows elimination of the attachment process for the breathable film.
　2.The number of parts can be reduced.
　3.The breathable film connectors are easy to guarantee.

The mold cavity size can be adjusted to fit variation in the dimensions of insert parts.This enables stable production, even when insert parts have large dimensional variation, which is the case with laminated cores or sintering cores.

＜Merit＞
Even if the size of the insert part changes,　1. Molding can be carried out without finishing.　　2. Stable production is possible without damaging the mold.