Manufacture of bags

Abstract

A synthetic plastic bag for containing liquids, e.g., urine, has a plastic outlet tube. It is manufactured by a first step of seam welding the tube between two superposed bag walls. In a subsequent step, an encircling sleeve is slide over the tube to a position where it contains within it the portions of the bag walls on either side of the tube. Thirdly, this sleeve is compressed onto the tube by a crimping operation conducted with the crimping force applied in a direction radially of the tube but at substantially right angles to the plane in which the bag walls lie. Alternatively, after the tube is seam welded between the bag walls, the bag and tube combination is then placed between the blocks of a mold, each block having confronting recesses of a particular shape and molten plastics material is injected to fill these recesses. The injected material forms a collar which completely surrounds the tube. The bag film material on either side of the tube is melted to itself and to the tube wall, and the collar is securely attached in an encircling configuration so precluding leakage. The tube may be part of a tap or other outlet fitting such as a push-pull tap.

Dependencies are inferred from the claim text.