Method for changing rolls of tubular film

Details Method for changing rolls of tubular film Method for changing rolls of tubular film

B - Operations, Transporting

65

B

B65B 41/12 (2006.01) B29C 65/18 (2006.01) B65H 19/18 (2006.01)

Patent

CA 2544441

The invention relates to a method for joining an initial section of a strip- type tubular film (2) to an end section (4) of a second tubular film (5) extending in an at least partially strip-type manner over successive processing stations, especially a sacking installation. According to said method, at least one foldable tongue (3a, 3b, 4a, 4b) is formed by cutting the initial and end sections (3, 4) of the two flexible tubes (2, 5) to be joined, applying a tongue (4a, 4b) of the end section (4) to a tongue (3a, 3b) of the initial section (3), and joining the superimposed tongues (3a, 3b, 4a, 4b) in a tension-proof manner. The initial and end sections (3, 4) of the tubular films (2, 5) are joined in a tension-proof manner by means of welding which is preferably carried out by means of ultrasound.

L'invention concerne un procédé pour raccorder une partie initiale (3) d'un film tubulaire (2) en forme de bande à une partie terminale (4) d'un deuxième film tubulaire (5) s'étendant, au moins partiellement sous forme de bande, sur des stations de traitement placées en aval, notamment d'une ensacheuse (3). Selon ce procédé, au moins une languette (3a, 3b, 4a, 4b) repliable est formée par découpage au niveau des parties initiale et terminale à raccorder (3,4) des deux films tubulaires (2,5). Une languette (4a, 4b) de la partie terminale (4) est placée sur une languette (3a, 3b) de la partie initiale (3) et les languettes superposées (3a, 3b, 4a, 4b) sont assemblées de manière à résister à la traction. La réalisation d'un assemblage résistant à la traction entre les parties initiale et terminale (3,4) des films tubulaires (2, 5) s'effectue par soudage, de préférence par soudage par ultrasons.

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