Process for Producing Unstretched Film, Process for Producing Resin-Coated Metal Sheet, and Apparatus for Producing Unstretched Film

A process for producing a resin-coated metal sheet comprising

• heating and melting thermoplastic resins and ejecting and extruding them through an extrusion T-die onto a metal sheet to coat it by lamination,
• wherein a thermoplastic resin to coat a metal sheet by lamination and another thermoplastic resin than the thermoplastic resin are separately heated and melted,
• the other thermoplastic resin is led to both edges of an extrusion T-die,
• the two resins are ejected and extruded onto the metal sheet in such a manner that the other thermoplastic resin melt can coexist on both sides of the heated and melted thermoplastic resin and that the width of the part of the thermoplastic resin is larger than the width of the metal sheet, only the part of the thermoplastic resin is thus laminated on the metal sheet to coat it to give a resin-coated metal sheet, and
• thereafter the resin parts protruding from both sides of the metal sheet are cut off.

An apparatus for producing an unstretched film comprising

• an extruder (A1) for heating and melting a thermoplastic resin to form an unstretched film,
• an extruder (B1) for heating and melting another thermoplastic resin than the thermoplastic resin,
• a duct (A2) for resin melt supply connected to the extruder (A1),
• a duct (B2) for resin melt supply connected to the extruder (B1),
• a feed block where two holes are formed on both sides of the lower part of the duct (A2) for resin melt supply and are connected to the duct (B2) for resin melt supply,
• a manifold, a die lip connected to the manifold, and
• a T-die connected to the feed block.