HOT PLATE WELDING OF BLOW MOLDED PARTS: INFLUENCE OF THE BLOW MOLDING PROCESS ON WELD STRENGTH

摘要

The manufacturing process of complex blow molded parts does not only consist of the extrusion blow molding process but is finished of by hot plate welding. Especially with plastic fuel tanks more and more parts such as nipples, holders for hoses or clips, etc. are being welded on. The strength of the weld seam does not only depend on the welding parameters but also on the quality of blow molding such as wall thickness, wall thickness distribution or warpage. These characteristics result in different deformation during the heating and the joining phase. The correlation between the blow molding process, the quality of the blow molded part and the weld strength is shown.