METHOD FOR PREPARATION OF CORES

Description

[0001] The present invention concerns a method according to the preamble of claim 1.

[0002] Particularly in the tissue industry, large cores are used having a length of several metres and an inner diameter of, for instance, 250 to 600 mm. For economical reasons, and not the least environmental reasons, it is a large advantage if such large cores can be re-used as many times as possible. In order to be re-usable, the cores do not only have to have a clean and undamaged envelope surface, but it is in addition necessary to restore the ends to essentially the original state. Thus, there is a need of a method or a methodology for restoration or preparation of the ends of the empty cores for allowing re-use in the machine. An example of a joint between core parts is disclosed in the document WO 94/19271.

[0003] The object of providing a method that meets the above-mentioned need forms the basis of the present invention.

[0004] This object is realised by the present invention in the method mentioned by way of introduction by it being given the characterizing features of the claims.

[0005] In the following, the present invention will be described in more detail, reference being made to the appended drawings. Fig. 1 shows four views of cores during different stages while carrying out an embodiment of the method according to the present invention. Fig. 2 shows three views of cores during different stages while carrying out an embodiment of the method according to the present invention. Fig. 3 shows three views of cores during different stages while carrying out another embodiment of the method according to the present invention. Fig. 4 shows three views of cores during different stages while carrying out yet an embodiment of the method according to the present invention. Fig. 5 shows a layout of a device for carrying out the method according to the present invention.

[0006] The method according to the present invention will now be described in connection with the preparation or gluing of large cores, e.g. 2540 mm long and having a diameter of 305 mm, onto which non-self-supporting material is wound, e.g. tissue, so that re-use of identical core lengths is allowed. A used core is cleaned of residual material and glue residues. Such an initial core 1 is shown in Fig. 1, and at both ends of the initial core 1, a core piece 2 and 3 is cut off. The length of the core pieces 2,3 may be 50-100 mm.

[0007] A lengthening core 4 is machined in one of the ends for forming a joint surface 5, which is internal and conical. One of the ends of the cut off initial core 1 is machined for forming a joint surface 6, which is external and conical. The conicity of the joint surfaces 5 and 6 fits to each other. A suitable glue is put on one of or both joint surfaces 5 and 6. The glue may be a cold-water glue or a combination of a cold-water glue and a hot-melt glue. After the glue application, the initial core 1 is assembled with the lengthening core 4 for compression of the joint surfaces 5 and 6 with each other. Compression is effected for a predetermined period of time, e.g. from a number of seconds (e.g. 30 s) to a number of minutes (20 min) depending on the type of glue.

[0008] After the compression, surplus glue is removed on the outside and on the inside. It is of particular importance that surplus glue is removed on the inside, since the core most often is located on an expanded shaft during the winding of the material onto the same.

[0009] If required, the length of the initial core 1 provided with the lengthening core 4 is adjusted to the correct and desired length. If the lengthening core 4 has a length of the total length of the core pieces 2 and 3 plus the horizontal joint surface length, it may be possible to avoid the adjusting cutting of the new reusable core 1 with the glued-on lengthening core 4. After confirmation of whether the core 1 with the lengthening core 4 has the correct length, it can be reinstalled into the reeling machine.

[0010] In Fig. 2, a combination 7 of an initial core with a glued-on lengthening core is shown. From the combination 7, a core piece 8 and a core piece 9 are cut off. The end of the combination 7, which lacks a lengthening core piece, is machined for forming a joint surface 6, which, as in the preceding embodiment, is external and conical for co-operation with a lengthening core 4 having a corresponding joint surface 5. After application of glue, the combination 7 is assembled with the lengthening core 4 for compression of the joint surfaces 5 and 6 with each other for a predetermined period of time. After confirmation of whether the combination 7 with a new lengthening core 4 has the correct length, it can be reinstalled into the reeling machine.

[0011] The embodiment shown in Fig. 3 is in principle the same as the embodiment disclosed in connection with Fig. 2 except that the combination 7 is turned or rotated half a turn so that the end, which is provided with the lengthening core 4, points in the opposite direction.

[0012] In Fig. 4, there is shown an embodiment, according to which core pieces 8 and 9 are cut off from a combination 7, and the lengthening core end of the combination 7 is machined for forming a joint surface 6 for assembling with a joint surface 5 of a lengthening core 4. After glue application on the joint surfaces 5 and 6, the parts are pressed together for a predetermined period of time.

[0013] Even if the embodiment in Fig. 4 is fully functional, it is, however, preferred to place the lengthening core 4 every second time on every second end of the core combination. This would entail that, in the embodiment according to Fig. 4, the lengthening core 4 would be placed on the right end, as shown in Fig. 4, of the combination 7. This provides optimum strength by the fact that the central part of the core combination always will be seamless, that is unjointed, which is of advantage, since the central part of the core is subjected to the greatest stresses. After placement of a lengthening core 4 on both ends of a core 1, it is not critical with the selection of end of the core 1 for the placement of a lengthening core 4, although a regularity is preferable.

[0014] In Fig. 5, there is shown a layout of a machine for carrying out the method according to the present invention. A magazine 1 with cores, from which tissue residues and glue residues have been removed and which thereby may be said to be empty, is connected to a feeder 2 for feeding one core at a time to a core cutter 3, in which core pieces 2,3,8, and 9 can be cut off from a core and in which an entire core may, if required, be cut into a number of lengthening cores. The lengthening cores are moved by means of the discharger 4 and are placed on a conveyor 6 for lengthening cores by means of a transfer robot 5. This robot 5 also transfers cut off core pieces 2,3,8, and 9 to a conveyor 8, which may lead to a scrap container. A transfer robot 7 moves lengthening cores from the conveyor 6 to a processing and gluing unit 11 for forming a joint surface. An end-cut core is moved by the discharger 4 to a table 9 having means for zero line adjustment and further to a feed unit 10, by which the core is fed into the processing and gluing unit 11 for forming a joint surface. After glue application, the joint surfaces are being pressed together and held pressed together for a predetermined period of time. The core provided with lengthening core is placed on the table 12 for further transfer to the grinding unit 13 and a core cutter 14 for removal of surplus glue and length correction. The machine is controlled from an operator console 15. A suction unit 17 is arranged for dust extraction. Furthermore, the machine is surrounded by a protection fence 18, and in the machine, a number of electric cabinets 16 are also included.

Claims

1. Method for preparation of cores (1) primarily cores for non-self-supporting materials, particularly tissue and the like, after removal of material residues and glue residues for allowing re-use of the cores (1) in the same way as new and unused cores a number of times, characterized in that a piece (2,3) of each end of an essentially empty core (1) is cut off while retaining the overall length of the core (1), that at least one end (6) of the empty and at each end cut core (1) is prepared for joining with a lengthening core (4) prepared for joining for restoration of the core (1) to the original length and for positioning the joint or splice between the core (1) and the lengthening core (4) near the end of the core (1) joined with the lengthening core (4), that the end (5) of the lengthening core (4) is machined to conical shape, that the clean cut core end (6) is machined to the corresponding conical shape to fit on or in the lengthening core (4) and in that the core (1) is joined with a lengthening core (4) having a sufficient length to allow, after the joining, restoration of the original length of the core (1) by cutting the end of the lengthening core (4) and/or the end of the core (1) opposite the lengthening core (4).

2. Method according to claim 1, characterized in that the end of the lengthening core (4) is machined internally, and that the end of the core (1) is machined externally.

3. Method according to claim 2, characterized in that one or more glue strings are applied to at least one of the machined surfaces, and that the lengthening core (4) and the core (1) are being pressed together and held pressed together for a predetermined period of time.

4. Method according to claim 3, characterized in that surplus glue is removed on the inside and/or the outside.

5. Method according to claim 1, characterized in that an empty core (1) is cut off to suitably long lengthening core (4), and that one of the ends of a selected lengthening core (4) is machined to a suitable joining surface.

6. Method according to any one of the preceding claims, characterized in that an empty core (7) with a lengthening core (8) in one of the ends is turned so that the end without lengthening core (4) is machined for joining with a lengthening core (4).

7. Method according to claim 6, characterized in that empty cores (7) with a lengthening core (8,9) in both ends are end-switched so that different ends of the core (7) are provided with lengthening core (4) from time to time.

8. Method according to claim 6 or 7, characterized in that the length of the lengthening core (4) is varied.

Ansprüche

1. Verfahren zur Herstellung von Kernen (1), in erster Linie von Kernen für nicht selbsttragende Materialien, insbesonders Gewebe und dergleichen, nach Entfernung von Materialresten und Klebstoffresten, um Wiederbenutzung der Kerne (1) in derselben Weise wie neue, unbenutzte Kerne mehrmals zu gestatten, dadurch gekennzeichnet, dass ein Stück (2, 3) von jedem Ende von einem im Wesentlichen leeren Kern (1) abgeschnitten wird, während die Gesamtlänge des Kerns (1) beibehalten wird, dass mindestens ein Ende (6) des leeren und an jedem Ende geschnittenen Kerns (1) zur Verbindung mit einem Verlängerungskern (4) vorbereitet wird, zur Verbindung für die Wiederherstellung des Kerns (1) auf die ursprüngliche Länge vorbereitet wird und um die Verbindung oder den Spleiß zwischen dem Kern (1) und dem Verlängerungskern (4) in der Nähe des Endes des Kerns (1) anzuordnen, der mit dem Verlängerungskern (4) verbunden ist, dass das Ende (5) des Verlängerungskern (4) zu einer konischen Form bearbeitet wird, dass das sauber geschnittene Kernende (6) zu der entsprechenden konischen Form bearbeitet wird, um auf oder in den Verlängerungskern (4) zu passen und dass der Kern (1) mit einem Verlängerungskern (4) verbunden wird, der eine ausreichende Länge aufweist, um nach dem Verbinden eine Wiederherstellung der ursprünglichen Länge des Kerns (1) zu gestatten, indem das Ende des Verlängerungskerns (4) und/oder das Ende des Kerns (1) gegenüber dem Verlängerungskern (4) geschnitten wird.

2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass das Ende des Verlängerungskerns (4) intern bearbeitet wird, und dass das Ende des Kerns (1) extern bearbeitet wird.

3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass ein oder mehrere Klebstofffäden auf mindestens eine der bearbeiteten Oberflächen aufgetragen wird, und dass der Verlängerungskern (4) und der Kern (1) zusammengedrückt werden und für eine vorbestimmte Zeitdauer zusammengedrückt gehalten werden.

4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass überflüssiger Klebstoff auf der Innenseite und/oder der Außenseite entfernt wird.

5. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass ein leerer Kern (1) zu einem geeignet langen Verlängerungskern (4) abgeschnitten wird, und dass eines der Enden eines ausgewählten Verlängerungskerns (4) auf eine geeignete Verbindungsoberfläche bearbeitet wird.

6. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass ein leerer Kern (7) mit einem Verlängerungskern (8) in einem der Enden so gedreht wird, dass das Ende ohne Verlängerungskern (4) bearbeitet wird, um mit einem Verlängerungskern (4) verbunden zu werden.

7. Verfahren nach Anspruch 6, dadurch gekennzeichnet, dass leere Kerne (7) mit einem Verlängerungskern (8, 9) in beiden Enden endgeschaltet werden, so dass verschiedene Enden des Kerns (7) ab und zu mit dem Verlängerungskern (4) versehen werden.

8. Verfahren nach Anspruch 6 oder 7, dadurch gekennzeichnet, dass die Länge des Verlängerungskerns (4) unterschiedlich ist.

Revendications

1. Procédé pour la préparation de noyaux (1), principalement des noyaux pour matériaux non-autoporteurs, en particulier des tissus et autres, après l'élimination de résidus de matériau et de résidus de colle pour permettre une réutilisation des noyaux (1) de la même manière que des noyaux nouveaux et inutilisés un certain nombre de fois, caractérisé en ce qu'un morceau (2, 3) de chaque extrémité d'un noyau essentiellement vide (1) est coupé tout en retenant la longueur globale du noyau (1), qu'au moins une extrémité (6) du noyau vide et à chaque extrémité coupée (1) est préparée pour être jointe à un noyau d'allongement (4) préparé pour jonction en vue du rétablissement du noyau (1) dans la longueur d'origine et pour positionner le joint ou l'épissure entre le noyau (1) et le noyau d'allongement (4) près de l'extrémité du noyau (1) jointe au noyau d'allongement (4), que l'extrémité (5) du noyau d'allongement (4) est usinée selon une forme conique, que l'extrémité de noyau coupée propre (6) est usinée à la forme conique correspondante pour s'adapter sur ou dans le noyau d'allongement (4) et en ce que le noyau (4) est joint à un noyau d'allongement (4) ayant une longueur suffisante pour permettre, après la jonction, le rétablissement de la longueur d'origine du noyau (1) en coupant l'extrémité du noyau d'allongement (4) et/ou l'extrémité du noyau (1) à l'opposé du noyau d'allongement (4).

2. Procédé selon la revendication 1, caractérisé en ce que l'extrémité du noyau d'allongement (4) est usinée intérieurement, et que l'extrémité du noyau (1) est usinée extérieurement.

3. Procédé selon la revendication 2, caractérisé en ce qu'une ou plusieurs chaînes de colle sont appliquées à au moins une des surfaces usinées, et que le noyau d'allongement (4) et le noyau (1) sont pressés ensemble et maintenus pressés ensemble pendant une période de temps prédéterminée.

4. Procédé selon la revendication 3, caractérisé en ce qu'un surplus de colle est retiré sur l'intérieur et/ou l'extérieur.

5. Procédé selon la revendication 1, caractérisé en ce qu'un noyau vide (1) est coupé à un noyau d'allongement de longueur appropriée (4), et qu'une des extrémités d'un noyau d'allongement sélectionné (4) est usinée à une surface de jonction appropriée.

6. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce qu'un noyau vide (7) avec un noyau d'allongement (8) dans une des extrémités est tourné de telle sorte que l'extrémité sans noyau d'allongement (4) est usinée pour jonction avec un noyau d'allongement (4).

7. Procédé selon la revendication 6, caractérisé en ce que des noyaux vides (7) avec un noyau d'allongement (8,9) dans les deux extrémités sont commutés par extrémité de telle sorte que des extrémités différentes du noyau (7) sont pourvues d'un noyau d'allongement (4) de temps en temps.

8. Procédé selon la revendication 6 ou 7, caractérisé en ce que la longueur du noyau d'allongement (4) varie.

Drawing