Welding shoe; Plastic extrusion welder; Process for producing a plastic weld seam

摘要

A welding shoe for a plastics welding extruder, comprising a (preferably releasable) device for connecting the shoe to the melt outlet opening of the extruder, channel(s) for supplying melt from the outlet opening to the shoe, melt outlet opening(s) and a guide for forming the welded seam, is formed from ceramic material. Independent claims are included for: (A) a plastics welding extruder, comprising a melt chamber for melting the welding material, a drive for an extrusion screw supply device for transporting fusible material (specifically welding wire or granules) to the melt chamber, a welding shoe for applying the melt to the component to be sealed with formation of a welded seam and a nozzle device through which gas for heating the component to be sealed flows, where the welding extruder, supply device, supply device housing, welding shoe and/or nozzle are at least partially of ceramic material; and (B) a method for forming a welded plastic seam using a welding extruder of this type. CERAMICS AND GLASS - Preferred Materials: The welding shoe is formed from engineering ceramic, specifically aluminum titanate (Al2TiO5), partially stabilized zirconium oxide (ZrO24TzP) or silicon carbide (SiC). In the welding extruder, supply device, supply device housing, welding shoe and/or nozzle are at least partially of engineering ceramic, specifically silicon-filled silicon carbide (SiSiC).