A method of joining plastics sheet materials

Details A method of joining plastics sheet materials A method of joining plastics sheet materials

B - Operations, Transporting

29

C

B29C 45/14 (2006.01) B29C 45/16 (2006.01) B29C 65/70 (2006.01) B29C 65/00 (2006.01) B29C 65/04 (2006.01)

Patent

CA 2426938

A method of joining thin plastics film or sheet materials to form sealed pressure vessels or containers particularly vessels or containers for use in the medical industry such as blood or urine bags. Experience has shown that there is a wide distribution of working life to failure for commonly used bladder materials due to fatigue stress to the area adjacent to the weld joining the sheet materials together resulting from radio frequency welding which is a common prior technique. In the present invention an more accurate controllable and repeatable method using is disclosed using the plastics injection moulding technique which uprates below the melting points of the materials to be joined thus avoiding early failure due to material degradation caused by the radio frequency welding.

L'invention concerne un procédé d'assemblage de feuilles ou de films minces en matière plastique pour former des récipients ou des conteneurs hermétiques sous pression, notamment des récipients ou des conteneurs destinés à être utilisés dans l'industrie médicale, tels que des poches de sang ou d'urine. L'expérience montre que la durée d'utilisation est souvent limitée pour les matières de vessie habituelles en raison d'une fatigue par tension, dans la zone adjacente à la soudure reliant les feuilles, due à la soudure haute fréquence, qui est une technique antérieure courante. La présente invention a trait à un procédé contrôlable et reproductible avec une plus grande précision, faisant appel à une technique de moulage par injection de matière plastique effective en dessous des points de fusion des matières à assembler, ce qui empêche une défaillance précoce due à une dégradation de la matière occasionnée par la soudure haute fréquence.

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