| 摘要 |
PROBLEM TO BE SOLVED: To save the trouble to remove a synthetic resin other than a product which is internally hardened each time a mold is opened and also improve the yield of a synthetic resin material through significantly reducing the wasteful consumption of the synthetic resin material by making a runner and a sprue unnecessary when the various kinds of the synthetic resin material are sequentially injected into a single cavity to mold the finished product. SOLUTION: This injection molding method is the one for sequentially injecting the various kinds of the synthetic resin material into a single cavity 16 of the mold 14 and thereby molding the product made up of a variety of synthetic resin layers. The various kinds of the synthetic resin material are directly injected into the cavity 16 from the individual injection units through independent gates 16a and 16b.
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