Abstract
In this paper, electromagnetic induction bonding and ultrasonic welding are evaluated as two methods of bonding high strength, roll drawn polypropylene. In the first part, the use of electromagnetic induction bonding is considered. Joint regions had strength properties exceeding the cohesive strength of oriented polypropylene (OPP) material in the transverse direction. The percentage thickness of the disoriented region (the weld zone) was directly related to the reduction in tensile strength of parallel ply OPP laminates. In the second part, the use of ultrasonic welding using a range of tie layer materials is considered. Tie layers comprising ethylene–propylene copolymer (EPC) and small additions of amorphous polypropylene (APP) produced the most satisfactory results.
MST/905
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