Dual adhesive application for laminating elastic webs

B - Operations – Transporting – 32 – B

Patent

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Details

B32B 3/28 (2006.01) B32B 5/04 (2006.01) B32B 5/08 (2006.01) B32B 37/14 (2006.01)

Patent

CA 2444564

The present invention provides a method of making a laminated, gathered, elastic web. The method includes the steps of feeding a first substrate in a machine direction, feeding a second substrate aligned with the first substrate in the machine direction, and feeding an array of elastomeric strand material between the first and second substrates in such a manner that the elastomeric strand material is stretched in the machine direction and aligned with the first and second substrates. A hot melt pressure sensitive adhesive, such as a styrene-isoprene-styrene based adhesive, is applied to the other substrate, and a curable adhesive, such as a plyurethane based adhesive, is applied to the other substrate. Thereafter, the two substrates and the elastomeric strand material are compressed to form a laminate elastic web while maintaining the elastomeric strand material in its stretched state. Machine direction tension is maintained on the laminate until the hot melt adhesive cools and bonds the layer together. Thereafter, the machine direction tension is released to permit the elastic web to contract to form a gathered elastic web.

La présente invention concerne un procédé permettant de fabriquer une sangle élastique froncée et stratifiée. Le procédé consiste à fournir un premier substrat dans un sens machine, un second substrat aligné avec le premier substrat dans le sens machine, et une matrice d'un matériau à fils élastomères entre les premier et second substrats, de telle sorte que ledit matériau à fils élastomères soit étiré dans le sens machine et qu'il soit aligné avec le premier et le second substrats. Un adhésif autocollant thermofusible, tel qu'un adhésif SIS (styrène-isoprène-styrène), est appliqué sur l'autre substrat. Ensuite, les deux substrats et le matériau à fils élastomères sont compressés afin de former une sangle élastique stratifiée tandis que le matériau à fils élastomères est maintenu dans son état étiré. La tension du sens machine est maintenue sur le stratifié jusqu'à ce que l'adhésif thermofusible refroidisse et colle les couches les unes aux autres. Puis, la tension du sens machine est relâchée pour permettre à la sangle élastique de se rétracter afin de former une sangle élastique froncée.

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