Horizontal blow molding
AssigneeW. R. Grace & Co., Cryovac Division
InventorTyler K. Olcott
Life of this patent
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Abstract
Large blow molded objects are produced by extruding a generally tubular form in a horizontal direction so as to form a large pillow shaped object upon sealing. The sealed pillow shaped article is severed and conveyed to a mold having a predetermined configuration and blow molded into a desired shape. The horizontal production of the parison used for blow molding permits the production of large parisons without the sag associated with a vertical process and also permits continuous coextrusion of large parisons without the need for complex accumulating equipment.
Claims9
A process for molding hollow objects comprising:
- horizontally extruding a tubular form onto a conveying means;
- introducing pressurizing fluid into an interior of said tubular form to support said tubular form and providing said tubular form with a first seal to form a horizontally aligned parison;
- providing said parison with a second seal;
- severing said horizontally aligned parison from said tubular form;
- conveying said horizontally aligned parison so that said conveying means and said horizontally aligned parison are located between movable mold sections;
- removing said conveying means from between said movable mold sections;
- and
- forming said parison into a predetermined configuration between said movable mold sections.
A molding process comprising:
- horizontally extruding a tubular form comprising high density polyethylene;
- introducing pressurizing fluid into an interior of said tubular form to support said tubular form and providing said tubular form with a first seal to form a horizontally aligned parison;
- slideably moving said parison across a silicone rubber surface;
- providing said parison with a second seal;
- severing said horizontally aligned parison from said tubular form;
- conveying said horizontally aligned parison to a mold;
- and
- forming said horizontally aligned parison into a predetermined configuration in said mold.
Dependencies are inferred from the claim text.