| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing pearl gloss synthetic paper and a transparent film suitable as an in-mold bonding label capable of being integrated with a molding material of a bottle or a can even if a hot melt adhesive is not preliminarily applied to the rear surface of each of the synthetic paper and the transparent film. SOLUTION: A single screw extruder and a vent type twin-screw extruder having a side feeder are used by a three-layered coextrusion method and a composition of a polypropylene resin and inorganic matter is respectively extruded from both extruders and the extrudates from both extruders are allowed to meet with each other to form a three-layered sheet of paper-like layer or resin layer/foamed intermediate layer or resin layer/resin layer and this three-layered sheet is further passed through cooling/ molding, biaxially stretching, corona treatment and taking-up steps to obtain the pearl gloss synthetic paper for the in-mold bonding label of the three-layered coextrusion type of matte surface paper-like layer/foamed intermediate layer/adhesive layer or gloss paper-like surface/foamed intermediate layer/adhesive layer and the transparent film for the in-mold bonding label of the three-layered coextrusion type of resin layer/resin layer/adhesive layer. |
