Liner for dispensing container

Claim 1

An elongated radially expandable and longitudinally essentially inextensible generally cylindrical flexible plastic liner having an open end, a closed end, and a sidewall extending from said open end to said closed end; said sidewall comprising an upper sidewall, an essentially cylindrical mid-section and a tapered lower portion which terminates in a tip at said closed end; said upper sidewall including an externally turned flange at said open end and a neck section below said flange; said mid-section and said tapered lower portion of said sidewall comprising a plurality of longitudinally extending sidewall sections arranged in side-by-side relationship, wherein adjacent sidewall sections intersect forming alternating longitudinally extending peaks and valleys, the angle of intersection at said peaks being an acute angle not exceeding about 70° when said liner is in the unstressed state; said liner having sufficient thickness to be self supporting in the unstressed state, the upper sidewall and the mid-section of said sidewall having an essentially uniform average thickness in the range of about 0.010 inch to about 0.020 inch; the thickness of the liner in the axial direction at the tip being sufficient to withstand the force of a mandrel used to insert said liner into an elastomeric sleeve, said thickness being from about 0.1 to about 0.3 inch; said liner being formed of a plastic material which has memory and being formed in the folded state wherein said peaks and valleys are present, whereby said liner returns to the folded state when unstressed.