Method and apparatus for forming a guide rib on a section of plastic film
AssigneeS.C. Johnson Home Storage, Inc.
InventorJames C. Pawloski
Life of this patent
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Abstract
A method and apparatus for forming a rib on a section of plastic film utilizes a roll having a groove, extrudes molten polymer into the groove, and places the section of plastic film in contact with the molten polymer in the groove. The molten polymer in the groove is allowed to cool below the melting point thereof while the section of plastic film is in contact with the polymer to cause bonding therebetween and thereby form the rib.
Claims57
A method of forming a rib on plastic film, the method comprising the steps of:
- providing a roll having a groove;
- extruding molten polymer into the groove;
- placing the plastic film in contact with the molten polymer in the groove;
- and
- allowing the molten polymer in the groove to cool below the melting point thereof while the plastic film is in contact with the polymer to cause bonding therebetween and thereby form the rib.
A method of forming a pair of ribs on either side of a closure element carried by a section of plastic film, the method comprising the steps of:
- providing a roll having a pair of grooves;
- extruding molten polymer into the grooves;
- placing the section of plastic film in contact with the molten polymer in the grooves such that the closure element is disposed between the grooves;
- and
- allowing the molten polymer in the grooves to cool below the melting point thereof while the section of plastic film is in contact with the polymer to cause bonding therebetween and thereby form the ribs.
An apparatus for forming a rib on a section of plastic film, comprising:
- a roll having a groove;
- an extrusion die for extruding molten polymer into the groove;
- and
- a positioning system that places the section of plastic film in contact with the molten polymer in the groove such that the molten polymer in the groove is allowed to cool below the melting point thereof while the section of plastic film is in contact with the polymer to cause bonding therebetween and thereby form the rib.
Dependencies are inferred from the claim text.