Multi-cavity mold, method of fabricating same and molding...

Details Multi-cavity mold, method of fabricating same and molding... Multi-cavity mold, method of fabricating same and molding...

B - Operations, Transporting

29

C

B29C 45/78 (2006.01) B29C 45/27 (2006.01) B29C 45/73 (2006.01) B29C 45/77 (2006.01)

Patent

CA 2079390

A multi-cavity mold has flow-distribution adjusting heaters provided for respective ones of main runners branching from a common channel so as to correspond to a plurality of cavities. The amount of resin charged into the cavities is made uniform from one cavity to the next by independently controlling the heaters. Sub-runners leading respective ones of the main runners are respectively provided with heaters for adjusting gate finish. The gate finish and moldability are improved by independently controlling these heaters. The main runners hold enough resin for at least one shot, and pressure loss in the sub-runners is made equal to or greater than pressure loss in the main runners.

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