| 摘要 |
PURPOSE:To obtain a smooth two-color inflatable film having a boundary demarcation clear in appearance with uniform thickness free of steps at boundary by supplying thermoplastic resin having a specified melt index (MI) range from the side of an inflatable film die, coextruding the resin with the base layer and welding it to the side of the base layer. CONSTITUTION:Assume the MI of thermoplastic resin A is represented by MI(A) and the MI of thermoplastic resin B as MI(B), thermoplastic resins A and B having a relation of 0.5MI(A)<=MI(B)<=0.9MI(A) are used. The thermoplastic resin B making up a stripe that flows from a resin inlet 8 into a laminated ring 2 is supplied equally through a resin passage 4 into the laminated ring 2, provided from a resin outlet 10 that makes a partial notch part or a throttled hole part on the inside of the laminated ring 2 into a resin passage 1' and laminated on the thermoplastic resin A that makes a base layer. |
