초록 ▼

The neck of a container has a smooth seal surface engaged by the inner skirt or plug of a cap. Such surface is free of trim and parting line flaws which are characteristic of blow-molded jars because the surface is formed in such a way that the seal surface is not in contact with mold parting lines

The neck of a container has a smooth seal surface engaged by the inner skirt or plug of a cap. Such surface is free of trim and parting line flaws which are characteristic of blow-molded jars because the surface is formed in such a way that the seal surface is not in contact with mold parting lines and further the trim (excess plastic) of the neck is located away from the sealing surface. In one form of the disclosure, above the sealing surface the neck wall slants outward and then bends upward-inward in a short, tapered stretch which engages the underside of the cap disk to compress against the disk or a liner or foil. Other forms of seal surfaces are disclosed. The exterior of the neck is formed with screw threads which engage threads on the interior of the outer skirt of the cap. Caps suitable for combination with the neck, methods of forming the neck and mold apparatus for forming the neck are also disclosed.

대표청구항 ▼

[ What is claimed is:] [1.]1. In combination, a neck for a blow molded plastic container and a cap, said cap having a top, an outer skirt depending from said top, a plug substantially vertically depending from said top, said plug being located inward of said outer skirt with an annular gap between s

[ What is claimed is:] [1.]1. In combination, a neck for a blow molded plastic container and a cap, said cap having a top, an outer skirt depending from said top, a plug substantially vertically depending from said top, said plug being located inward of said outer skirt with an annular gap between said outer skirt and said plug, and neck engaging means on said outer skirt,said neck comprising a sealing portion having a smooth, internal primary seal surface characterized by the absence of mold parting lines sealingly engaging said plug,an outward bend above said sealing portion, an outward extending stretch joined to said outward bend, an upward stretch above said outward extending stretch, an inward bend above said upward stretch, and an inwardly extending flange joined to said inward bend, said flange terminating in a trim line spaced outward of said plug,a second portion below said seal surface, and at least one external cap engaging means on said second portion,said neck engaging means and said external cap engaging means comprising inter-engaging screw threads.