초록 ▼

A method of forming a container having upper and lower portions, the lower portion having self-supporting side walls and a bottom wall. The upper portion is flexible and non-self-supporting. Preferably, the upper and lower portions are formed of plastic material with the upper portion forming a inte

A method of forming a container having upper and lower portions, the lower portion having self-supporting side walls and a bottom wall. The upper portion is flexible and non-self-supporting. Preferably, the upper and lower portions are formed of plastic material with the upper portion forming a integral continuation of the lower portion. The entire container may be formed using blow molding techniques or other conventional means such as co-extrusion.

대표청구항 ▼

A method of making a plastic container comprising an enclosure having integral upper and lower portions, said lower portion being generally tubular and including side walls of a plastic material of a predetermined thickness and a bottom wall, and said upper portion being a tubular extension of said

A method of making a plastic container comprising an enclosure having integral upper and lower portions, said lower portion being generally tubular and including side walls of a plastic material of a predetermined thickness and a bottom wall, and said upper portion being a tubular extension of said lower portion, and having an open upper end, and being of a flexible, gatherable, and non-self-supporting thin film plastic material of a predetermined thickness substantially less than the thickness of the plastic material forming said lower portion, whereby the container may stand in an upright orientation with the side wall supporting said upper and lower portions, the steps comprising forming said upper and lower portions by extruding sequentially continuous first and second portion of a parison having first and second wall thicknesses, one thickness being substantially less than other, disposing said first and second parison portions in a blow mold having mold walls, urging the first and second parison portions into conformance with the mold walls to form the container, the parison portion of substantially less thickness forming said upper container portion, and removing a part of said upper portion to form said open upper end.