专利名称：IMPROVEMENTS IN OR RELATING TO
WELDING
发明人：STEPHEN FRED WALLWORK申请号：AU2951592申请日：19921125公开号：AU2951592A公开日：19930628
摘要：The invention relates to a method of, and apparatus for, welding an elementcomprising paper to a thermoplastic material, without pre-treatment of the plasticsmaterial. In one described embodiment a laminate (12) comprising paper, with a vapourpermeable, liquid impermeable coating on one major surface, was successfully welded toa polypropylene material (15) some 1.5 mm thick, the uncoated surface of the laminateforming the interface with the polypropylene, by subjecting the interface to conditionsbetween two ranges of parameters, a temperature of 185 DEG C and a pressure of 460kPa for a period of 10 seconds and a temperature of 220 DEG C and a pressure of 460kPa for a period of 5 seconds. All the welds effected between said ranges of parametersproduced an acceptable weld of the paper to the thermoplastics.
申请人：RECKITT & COLMAN PRODUCTS LIMITED
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