FITA TERMOPLASTICA COM ESTRUTURA DE MATERIAL MULTIPLA E JUNTA SOLDADA PRODUZIDANA MESMA

摘要

A length of thermoplastic strapping for use as strap disposed in a loop around an article with overlapping strap portions arranged face-to-face and welded together, has a first layer (10) including a first material and a secoind material (12) carried by the first layer (10). The second material (12) ensures the creation of a plurality of cavities or discrete volumes (50) in the first material in the weld. The second material may be a layer of material with pre-formed cavities or may be a particulate foaming agent (12) located on or in the first layer (10). The welded joint from such strapping includes a resolidified region (8) formed by fusing at least part of the thickness of each strap portion. The resolidified region (46) includes a solid phase of the first material and a plurality of discrete volumes (50) defined in the resolidified region from which the fist material is absent and which are distributed in the first material across the width and thickness of the resolidified region (46) at least adjacent each end of the resolidified region (46).