Process for manufacturing an element constituted of a support and a membrane welded to it, in particular a stop for a straw and assembly of membrane-supports obtained by this process

摘要

Following cooling, the cylinder (2) is pulled normally away from the surface, bringing with it, a welded section (7) of membrane (1). The membrane is cut at the instant of welding, for separation without defects. An Independent claim is included for an assembly comprising a membrane with numbers of cylinders welded to it as described. Preferred features: A shaped, electrically heated ring-anvil makes the weld and cut. It includes a heating electrode. The cut is facilitated by turning this tool about its axis, executing between one quarter of a turn, and several turns, e.g. a half turn. The cylinder is surrounded by a stripper plate. Traction is applied to the membrane along the cylinder axis. Following welding a clamping plate is pressed down around the cylinder before separation. Numbers of cylinders may be welded to the membrane, prior to separation. Notable features of the membrane/cylinder assembly produced include the microporus hydrophobic nature of the membrane, sealed to liquids but permeable to gases. The insert material is colored.