Overmolded Pet Preform Mould

In very basic terms,Pet Preform are overmolded by placing one plastic on top of the other. In most cases, this involves molding a soft elastomer onto a more rigid substrate, such as a two-piece toothbrush with a soft elastomer coated mold on the rigid polypropylene substrate to impart a « soft » feel.
This is usually very straightforward as long as you have good dimensional control of the substrate.
Recently we have an overmolding project that requires molding a softer hardness on a softer substrate. With the development of molded parts, the walls of the substrate are quite thick, which makes this even more interesting.
First, we found that the part size was too large, we checked the cavity, shrinkage, and processing parameters, but everything was in line with the specifications. We had to squat for a few minutes until we realized what was going on, the first mold (substrate) was actually compressed during the second molding process, when the mold was opened, the part was allowed to decompress and it grew Nearly 10%. We were able to compensate for this with different molding parameters and make the parts conform to the specifications, but it did take us a while.
The main reason for mentioning this is to help us keep thinking. Jilian mold has many years of experience in the injection China Pet Bottle molding. With a wealth of knowledge, we can solve many problems in the production process. . If you have a mold requirement, please feel free to contact us.

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