Manufacture of bags

摘要

A synthetic plastics bag for containing liquids, e.g. urine, and having a plastics outlet tube 10 is manufactured by a first step of seam welding the tube between two superposed bag walls. In a subsequent step, an encircling sleeve 20 is slid 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.