Method and device for jointing core ends

B - Operations – Transporting – 65 – H

Patent

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Details

B65H 75/10 (2006.01) B31C 5/00 (2006.01) B65H 75/50 (2006.01)

Patent

CA 2336798

The present invention relates to a method for end-to-end joining of paper roll cores into a continuous core master. The primary goal of the invention is to produce usable cores from those returned for recycling after use. In the method, the ends of core sections are reworked into complementary shapes required for a mating joint, glue is applied to the complementary mating surfaces of the joint and the core section ends pushed in the axial direction abutting each other and the glue is set. According to the invention, the cross section of the cores is trued circular at least over the area of the joined core sections by applying a radially expansive trueing force on the joint. The radial trueing force is also advantageously employed for braking the axial travel of the core sections during the joining operation. The invention also concerns an apparatus suited for implementing the method.

L'invention concerne un procédé d'assemblage bout à bout de mandrins de rouleau de papier, de sorte qu'un mandrin continu de base soit formé. Le procédé de l'invention permet d'abord la production de mandrins utilisables, à partir de mandrins usagés à recycler. Dans le procédé de l'invention, les extrémités des mandrins sont modifiées de sorte qu'elles aient la forme complémentaire requise pour la formation d'un joint, de la colle est appliquée sur les surfaces complémentaires coïncidantes du joint et les extrémités des mandrins sont poussées dans le sens axial de sorte qu'elles viennent l'une contre l'autre, et la colle est mise à sécher. Selon l'invention, la section des mandrins est dégauchie de manière circulaire au moins sur la zone des sections de mandrins jointes, par l'application d'une force de dégauchissement d'extension radiale sur le joint. Ladite force de gauchissement radiale est également utilisée avantageusement pour le freinage du déplacement axial des sections de mandrins lors de l'opération d'assemblage. L'invention se rapporte également à un appareil permettant la mise en oeuvre du procédé.

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