| 摘要 |
This invention relates to a process for the bonding of multilayer, overlapping foil ribbons of thermoplastic material comprising the steps of forming a continuous length of at least two foil ribbons of cold thermoplastic material to overlap at the edges, whereby the said overlap comprises at least four layers of said foil ribbon, inserting a continuous heated strip of thermoplastic material in thermoplastic condition between two of said overlapping layers, said continuous heated strip having a width of less than said overlap and a temperature above that required to cause said foil ribbons of thermoplastic material to become viscous and below that required to cause said foil ribbons of thermoplastic material to melt, compacting said overlap, whereby a union is formed between said at least four layers of said foil ribbon in said overlap and said continuous strip, cooling said union and recovering a continuous, bonded, multilayer overlapping foil ribbon. |
