Headed thermoplastic tube
AssigneeCourtaulds Packaging Inc.
InventorsGeorge H. Holoubek, John J. Rhoades
Life of this patent
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Abstract
A headed thermoplastic tube is formed solely from a thermoplastic extruded, stretched, cylinder by positioning the cylinder over a forming mandrel with an exposed portion. The inner surface of the exposed portion is heated above the glass transition temperature of the thermoplastic material to render the inner surface molten while the outer surface provides support for the exposed portion of the cylinder. The heated exposed portion is then shaped into a conical shape, such as by heating the outer surface, and pressure applied to the conical shaped exposed portion to form a headed thermoplastic tube. The headed tubes produced have a body portion, shoulder portion and neck portion, without any seams, all of which are formed from the starting thermoplastic extruded, stretched cylinder.
Claims9
A headed thermoplastic tube formed solely from a thermoplastic extruded, stretched, cylinder, said cylinder stretched in the direction of the longitudinal axis, said tube having a body portion, having a uniform wall thickness within a variance of only about 10 percent thickness, shoulder portion and neck portion, all of which are comprised of the thermoplastic material from which said thermoplastic extruded, stretched, cylinder was formed, with no seams or joints present throughout said body portion, shoulder portion and neck portion.
A headed thermoplastic tube formed solely from a thermoplastic extruded, stretched, cylinder, said cylinder stretched in the direction of the longitudinal axis, said tube having a body portion, having a uniform wall thickness within a variance of only about 10 percent thickness, shoulder portion and neck portion, all of which are comprised of the thermoplastic material, selected from the group comprising high density polyethylene, low density polyethylene, polypropylene, and polyethylene terephthalate, from which said thermoplastic extruded, stretched, cylinder was formed, with no seams or joints present throughout said body portion, shoulder portion and neck portion.
Dependencies are inferred from the claim text.