Process for producing unstretched film, process for producing resin-coated metal sheet, and apparatus for producing unstretched film
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United States of America Patent
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Jul 26, 2011
Grant Date -
Jul 3, 2008
app pub date -
Feb 25, 2005
filing date -
Mar 1, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
A process by which many kinds of unstretched films comprising a thermoplastic resin are produced each in a small amount and high yield. A thermoplastic resin (A) to be formed into an unstretched film and another thermoplastic resin (B) are separately melted by heating. The thermoplastic resin (B) is introduced to each edge part of a T-die (2) for extrusion. The two resins are ejected and extruded on a casting roll so that the thermoplastic rosin (B) is disposed on the side of each edge of the thermally melted thermoplastic resin (A). Thus, an unstretched film (20) is formed which comprises the thermoplastic resin (A) and the thermoplastic resin (B) disposed on the side of each edge of the resin (A). Thereafter, the parts constituted of the thermoplastic resin (B) are removed y cutting to form a target unstretched film (20) consisting only of the thermoplastic resin (A).
First Claim
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International Classification(s)
- A23P:SHAPING OR WORKING OF FOODSTUFFS, NOT FULLY COVERE....
- B29C:SHAPING OR JOINING OF PLASTICS; SHAPING OF SUBSTAN....
- B28B:SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS, SLAG O....
- A01J:MANUFACTURE OF DAIRY PRODUCTS
- B29B:PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE ....
- A23G:COCOA; COCOA PRODUCTS, e.g. CHOCOLATE; SUBSTITUTES....
- A21C:MACHINES OR EQUIPMENT FOR MAKING OR PROCESSING DOU....
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