초록 ▼

A multilayer plastic perform formed from a combination of virgin and recycled plastic such as PET so that the resultant blow-molded bottle has a reduced tendency for bottom failure in spite of the use of recycled plastic. A first plastic preform for providing the inner layer of the multi-layer prefo

A multilayer plastic perform formed from a combination of virgin and recycled plastic such as PET so that the resultant blow-molded bottle has a reduced tendency for bottom failure in spite of the use of recycled plastic. A first plastic preform for providing the inner layer of the multi-layer preform is provided with spaced channels on the exterior surface of a closed end thereof extending from a central region of that end to the sidewalls. An injection mold cavity is provided with a like plurality of channels formed therein in a closed end thereof communicating with the injection gate of an injection molding apparatus. The first plastic preform is inserted into the injection mold cavity with the respective channels of the preform and the injection mold cavity substantially aligned. A second layer of plastic material is overmolded onto the first layer by injection molding in the cavity. A third layer of plastic material may be overmolded on the second layer to form a three-layer preform. Preferably the first and third layers are formed from virgin plastic and the second layer is formed from recycled plastic.

대표청구항 ▼

[ What is claimed is:] [1.] A multi-layer plastic preform comprising:an inner layer of plastic having an open end, sidewalls and a closed end, said closed end having a plurality of spaced channels on the exterior surface thereof extending from a central area on the closed end to the sidewalls; andan

[ What is claimed is:] [1.] A multi-layer plastic preform comprising:an inner layer of plastic having an open end, sidewalls and a closed end, said closed end having a plurality of spaced channels on the exterior surface thereof extending from a central area on the closed end to the sidewalls; andan overmolded second layer of plastic covering the sidewalls of the inner layer but only covering the channels on the closed end of the inner layer, the second layer defining ribs protruding from the channels, said ribs extending from the central area to the sidewalls coextensively with the channels.