Patent ID: 6649121
Filing Date: 2003-11-18
Classification: B29B,B29C,B29K,B29L

Abstract:
A method of making a laminated bottle having an outer layer and an inner layer laminated on an inner surface of the outer layer so as to be capable of delaminating from the surface, the method comprising the steps of:injection molding an outer preform for the outer layer by injecting a molten first resin, and forming a through-hole in the outer preform being injection molded at a portion thereof facing an injection gate for injecting the second resin, wherein the through-hole is formed by a first pin, the pin projecting toward a further injection gate for injecting the first resin through it after injecting of the first resin has been finished so that an end portion of the pin strikes the further gate; then injection molding inside the outer preform an inner preform for the inner layer by injecting a molten second resin through the gate and also the though-hole to flow along an inner surface of the outer preform so that the preforms comprise a parison; and and finally blow molding the laminated bottle by blowing the parison, wherein the second resin has a melting point lower than that of the first resin.