| 摘要 |
PURPOSE:To obtain a multi-layered injection molded article with two or more kinds of functions by forming a multi-layered injection molded article having a seven layer constitution by the use of four kinds of thermoplastic resins. CONSTITUTION:The multi-layered molded article is constituted from its outside of, e.g. a first layer and seventh layer (superficial layer) consisting of a polyolefin resin, a second and sixth layer consisting of a light shielding layer of a polyolefin resin colored by carbon black or a polyolefinic resin containing an absorptive filler or a recycled polyolefin resin, and a fourth layer consisting of an oxygen barrier resin, and employs a maleic anhydride graft modified resin of a polyolefinic resin as an adhesive resin for a third and fifth layers. Thus, the selection in a combination or the like between an oxygen barrier and light shielding or steam properties can be done, in addition, the cost can also be reduced by providing a recycling layer. In order to achieve such molding, there is employed an injection molding machine provided with a set of molds 80 and four kinds of injection devices 60 connected to a seven pipe nozzle 5. |
