| 摘要 |
PURPOSE:To contrive cost reduction of a molded article by making thickness of an external layer uniform and as thin as possible, by a method wherein a sprue of a mold has been provided close to the edge part of a molding apce. CONSTITUTION:The position of the sprue 13 of a mold 10 is set at the edge part of a molding space 12, an external layer material, for example, acrylic resin 30 is plasticized by a plasticizing device 19 and the same is made to flow in a flow path 16 from a nozzle touching surface 18 by a neceasary quantity. Then a screw 25 is revolved, driven and an inner layer material, for example, vinyl resin 31 is made to flow in a space 22 under a plasticized state of the resin. The same material is prepared under a dwelling state. The screw 25 is moved to the left in a drawing, a mold 11 is moved in the direction of an arrow symbol 33 according as injection of the molding materials 30, 31 progresses, a molded article is enclosed in an airtight state and the external layer 30 having fixed thickness is formed on the external circumference of the inner layer 31. |
