Title:
IMPROVEMENTS IN OR RELATING TO WELDING
Document Type and Number:
WIPO Patent Application WO/1993/010959
Kind Code:
A1
Abstract:
The invention relates to a method of, and apparatus for, welding an element comprising paper to a thermoplastic material, without pre-treatment of the plastics material. In one described embodiment a laminate (12) comprising paper, with a vapour permeable, liquid impermeable coating on one major surface, was successfully welded to a polypropylene material (15) some 1.5 mm thick, the uncoated surface of the laminate forming the interface with the polypropylene, by subjecting the interface to conditions between two ranges of parameters, a temperature of 185 °C and a pressure of 460 kPa for a period of 10 seconds and a temperature of 220 °C and a pressure of 460 kPa for a period of 5 seconds. All the welds effected between said ranges of parameters produced an acceptable weld of the paper to the thermoplastics.
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Inventors:
WALLWORK STEPHEN FRED (GB)
Application Number:
PCT/GB1992/002178
Publication Date:
June 10, 1993
Filing Date:
November 25, 1992
Export Citation:
Assignee:
RECKITT & COLMANN PROD LTD (GB)
International Classes:
A61L9/12; B29C65/00; B29C65/02; B65B7/28; B65D77/20; B29L22/00; (IPC1-7): A61L9/12; B29C65/02; B65B7/28; B65D77/20; C08J5/12
Domestic Patent References:
| WO1990011177A1 | 1990-10-04 | |||
| WO1984002654A1 | 1984-07-19 |
Foreign References:
| GB2053794A | 1981-02-11 | |||
| EP0260896A2 | 1988-03-23 | |||
| US3533548A | 1970-10-13 | |||
| CH426225A | 1966-12-15 | |||
| FR2204493A1 | 1974-05-24 | |||
| FR2637265A1 | 1990-04-06 | |||
| FR2019461A1 | 1970-07-03 | |||
| US4991375A | 1991-02-12 | |||
| US4257530A | 1981-03-24 | |||
| FR2202783A1 | 1974-05-10 | |||
| EP0093262A1 | 1983-11-09 |
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