Patent ID: 8673197
Filing Date: 2014-03-18
Classification: B29C,B29L,B32B

Abstract:
1. A method of producing a multi-layer structure by press-forming a molten resin mass of a thermoplastic resin and a functional resin, wherein said molten resin mass is the one that wraps therein a functional resin mass which comprises a core layer of a base body resin or a second functional resin covered with a shell layer of a first functional resin, said functional resin is a molten resin mass comprising any one of a gas-barrier resin, an oxygen-absorbing resin, a cyclic olefin resin or a liquid crystal polymer, and said molten resin mass is formed by continuously feeding the base body resin in a molten state, flowing the first functional resin into the interior of the base body resin, flowing the second functional resin or the base body resin into the interior of the first functional resin that has been fed already, and halting the flow out of the first functional resin by flowing out the second functional resin or the base body resin; flowing the first functional resin in again by halting the flow out of the second functional resin or the base body resin; halting the flow out of the first functional resin and feeding the base body resin only; and forming, in the base body resin, a molten resin flow in which a shell layer of the first functional resin and a core layer of the second functional resin or the base body resin are formed, and cutting away a portion of said molten resin flow in which only the base body resin is present; said first or second functional resin comprising any one of a gas-barrier resin, an oxygen-absorbing resin, a cyclic olefin resin or a liquid crystal polymer.