Patent ID: 6726874
Filing Date: 2004-04-27
Classification: B29C,B29L,B62D,Y10T

Abstract:
A method of blow molding a hollow article having a first wall and a second wall confronting across a spacing, with an integral rib disposed between said first wall and said second wall, comprising the steps of:opening a split mold, wherein said split mold has a first mold half with a cavity, and a second mold half with a cavity, a slide core and a pair of support cores on either side of said slide core; extruding a parison of molten thermoplastic resin between said split mold; closing said split mold; deforming said parison with said sliding core and said pair of support cores and forming a recess, wherein a leading end of said recess is fused to an inner surface of an opposing wall side; retracting said slide core; introducing a pressure substance into said parison; inflating said parison along a cavity surface of said split molds and said support cores and forming said integral rib between said first wall and said second wall, wherein said integral rib comprises a flat rib and a pair of hollow ribs; and cooling said split mold, opening said split mold and removing said hollow article.