초록 ▼

Apparatus for making a rigid container by injection molding a parison having plural layers of polymers. The parison is blow molded to the final shape of the container. Control during injection is exercised over each of the plural polymers so as to produce uninterrupted layers extending throughout th

Apparatus for making a rigid container by injection molding a parison having plural layers of polymers. The parison is blow molded to the final shape of the container. Control during injection is exercised over each of the plural polymers so as to produce uninterrupted layers extending throughout the walls of the parison and to insure that the interior layers are completely encapsulated within the outer layers.

대표청구항 ▼

In an apparatus for making a multi-layer injection molded article, the improvement comprising: (1) means for independently commencing the flow of a first polymer stream to become the inside surface layer of the article, the flow of a second polymer stream to become the outside surface layer of the a

In an apparatus for making a multi-layer injection molded article, the improvement comprising: (1) means for independently commencing the flow of a first polymer stream to become the inside surface layer of the article, the flow of a second polymer stream to become the outside surface layer of the article, and the flow of a third polymer stream between the first and second polymer streams to become an inner layer of the article, (2) means for independently controlling the flow of the polymer streams, (3) means for independently terminating the flow of the polymer streams, and (4) means associated with the independent commencing means, the independent controlling means and the independent terminating means, for coordinating their respective functions in a predetermined manner during the injection cycle, to permit termination of the flow of the first polymer stream, then termination of the flow of the third polymer stream, and thereafter termination of the flow of the second polymer stream to thereby enable the apparatus to provide the article with an inner layer formed from the third polymer stream that is continuous and is completely encapsulated within surface layers formed from said first polymer stream and said second polymer stream.