B29C 65/5021

Joining {or sealing} of preformed parts {, e.g. welding of plastics materials}; Apparatus therefor using adhesives {, i.e. using supplementary joining material; solvent bonding} using adhesive tape {, e.g. thermoplastic tape; using threads or the like characterised by the structure of said adhesive tape, threads or the like being multi-layered}