Method and device for the production of a number of coiled foil rolls

Abstract

The coiled foil rolls are reinforced in their edge region by folding. The coiled foil rolls are made by supplying a foil to coiling devices; cutting the foil in a conveying direction with a knife so that at least two foil sections are created which extend in a conveying direction; folding the edge regions of the foil sections by a folding device and laying the folded sections and the remaining part of the foil section on each other; and coiling the foil sections with the coiling devices. The knife or the folding device are moved simultaneous oscillating back and forth in a direction transversal to the conveying direction during the coiling of the foil sections.

Claims

1. A method for the production of a number of coiled foil rolls, wherein the foils are reinforced in both edge regions by folding, wherein the method comprises the steps of: a) supplying of a foil which extends along a total width in a conveying direction to a plurality of coiling devices; b) cutting of the foil in the conveying direction by means of at least one knife, so that at least two foil sections are created which extend in the conveying direction; c) folding of the edge regions of the foil sections by means of at least one folding device to form folded sections, and laying the folded sections and the remaining part of a respective foil section upon each other to form folded edge regions; d) coiling of each of the at least two foil sections on one or more of the plurality of coiling devices; wherein the at least one knife and the at least one folding device are moved simultaneous oscillating back and forth in a direction transversal to the conveying direction during the coiling of the foil sections on the one or more of the plurality of coiling devices.

2. The method according to claim 1, wherein the folding according to step c) includes folding, by the folding device, the lateral end sections of two foil sections which are located adjacent to another by means of two adjacent folding elements.

3. A device for the production of a number of coiled foil rolls, wherein the foils are reinforced in both edge regions by folding, and for carrying out the method according to claim 1, wherein the device comprises: a supplying device for supplying of a foil which extends along a total width in a conveying direction and a plurality of coiling devices, at least one knife for cutting of the foil along the conveying direction, at least one folding device for folding of the edge regions of the foil sections to form folded sections and for laying the folded sections and the remaining part of the foil section upon each other to form folded edge regions, an oscillation drive which is designed to move oscillating the at least one knife and the at least one folding device in a direction transversal to the conveying direction, wherein synchronisation means are arranged to synchronize the oscillation movement of the at least one knife and of the at least one folding device.

4. The device according to claim 3, wherein the at least one folding device comprises two adjacent folding elements, which folding elements can fold two adjacent lateral regions of two foil sections which are arranged side by side.

5. The device according to claim 4, wherein the two folding elements form, in a direction which is perpendicular to the conveying direction and perpendicular to the direction transversal to the conveying direction, a V-shaped contact region for two adjacent lateral regions of two foil sections which are arranged side by side, wherein the angle () of the V-shaped structure is between 5 and 60.

6. The device according to claim 4, wherein a roll is assigned to each folding element by which the foil is guided which has to be folded.

7. The device according to claim 6, wherein the axes (a) of the rolls include an angle () to the direction transversal to the conveying direction, wherein the angle () is between 1 and 30.

8. The device according to claim 4, wherein the synchronisation means comprise a pin which is arranged at the folding device, which pin engages in a recess in the oscillation drive, a roll is assigned to each folding element by which the foil is guided which has to be folded, and the two folding elements, the two rolls and the pin of the synchronisation means are arranged on a common carrier plate.

9. The device according to claim 8, wherein the carrier plate is arranged pivotable around an axis which axis is parallel to the direction transversal to the conveying direction, and the device further comprises an actuator arranged for carrying out the pivoting.

10. The device according to claim 8, further comprising a centre cone arranged on the common carrier plate and configured to locate and stabilize the folded edge regions.

11. The device according to claim 3, wherein the synchronisation means comprise a pin which is arranged at the folding device, which pin engages in a recess in the oscillation drive.

Description

BRIEF DESCRIPTION OF THE DRAWING

(1) In the drawing:

(2) FIG. 1 shows the side view of a device for the production of a number of coiled foil rolls which are cut out from a foil sheet and which are coiled after reinforcement of the edges by folding (turn over), wherein the operation position is shown,

(3) FIG. 2 shows the depiction according to FIG. 1, wherein a position is shown in which a folding device is not in operation,

(4) FIG. 3 shows in perspective view the device for the production of a number of coiled foil rolls,

(5) FIG. 4 shows the depiction according to FIG. 3, wherein the coupling of the folding devices with an oscillation drive is realised in a different manner as in FIG. 3,

(6) FIG. 5 shows in perspective view a folding device for folding of the edge regions of two adjacent foil sections,

(7) FIG. 6 shows the folding device according to FIG. 5, seen against the conveying direction of the conveyed foil sheet,

(8) FIG. 7 shows schematically a coiled foil roll and

(9) FIG. 8 shows the section through the edges region of the coiled foil.

DETAILED DESCRIPTION OF THE INVENTION

(10) In FIG. 1 and FIG. 2 a device for the production of a number of coiled foil rolls can be seen, wherein the foil rolls are produced by respectively cutting out and coiling a foil section with defined width from a foil sheet with a total width. A not depicted feeding device for the foil 17 is arranged upstream of the depicted device in conveying direction F of the foil 17, for example an output of an extruder in which the foil 17 is produced. Downstream of the depicted device a plurality of (not depicted) coiling devices for coiling of the foil sections (uses) is arranged. Thereby, it can be provided, which is preferred, that several foil sections are coiled on the same coiling device. Thereby, the feeding device as well as the coiling devices as such are well known in the art, wherein explicitly reference is made to the above mentioned state of the art.

(11) Rather, the arrangement as shown in FIGS. 1 and 2 is essential for the invention. Their detailed design becomes apparent especially from the synopsis with the further FIGS. 3 to 6.

(12) In the FIGS. 7 and 8 a finished foil roll 1 can be seen. This roll is a coiled foil section 5 which was cut out and then coiled from a wider fed foil with a total width. It should be mentioned and it can be seen in FIG. 8 that the foil section 5 which is coiled to the foil roll 1 comprises in its both edge regions 2 a folding 3, i.e. a folded section 7 is folded by 180 and laid along the rest of the foil section. By this folding 3 a significant higher mechanical stability of the edge region of the foil results as well as an insensibility of the edge region during unwinding of the roll also with respect to mechanical damages (if the roll occasionally falls down on the floor).

(13) At the production of the foil rolls 1 with lateral folding 3 it is now proceeded in such a manner that at first the foil, which extends along a total width, is conveyed (from the extruder) in conveying direction F and finally reaches the coiling devices. The device as shown in FIG. 1 is arranged between the conveying device and the coiling devices.

(14) The conveyed foil is then cut into uses, i.e. a cutting of the foil in conveying direction F occurs by means of a plurality of knifes 4 so that several foil sections 5 are created which extend in conveying direction F.

(15) Subsequently, the folding of the edge regions 2 of the foil sections 5 take place by means of a plurality of folding devices 6. A single one of those folding devices is shown more detailed in the FIGS. 5 and 6. By them a laying one upon the other of the folded sections 7 and of the remaining part of the foil section 5 takes place.

(16) Finallythis is not depicted any morea coiling occurs of each of the foil sections 5 at one or more coiling devices which are known as such (see for details the above mentioned state of the art).

(17) Thereby, it is essential that the knifes 4 and the folding devices 6 are moved simultaneously oscillated forth and back in a direction transversal Q to the conveying direction F relatively to the coiling devices during the coiling of the foil sections 5 on the coiling devices. For doing so an oscillation drive 8 is arranged.

(18) As it can be seen best from FIG. 5 the folding occurs in such a manner that the folding device 6 folds the lateral end sections of two adjacent arranged foil sections 5 by means of every two adjacent folding elements 11 and 12, wherein the folding is supported and stabilized also by the rolls 13, 14 and a centre cone 22. Thus, the foil section 5 is at first cut by the knife 4 and pre-oriented by 90 at the rolls 13, 14. By means of the folding elements 11, 12 the flapping of the foil edges occurs in the respective direction, wherein then a further fixation occurs by means of the centre cone 22 as well as a stabilisation of the subsequent coiling.

(19) The foil section 5 which is to be folded in the edge regions is thus pre-oriented for the folding by means of the rolls 13, 14 (bending by about 90), wherein the folding elements 11, 12 which follow in conveying direction F finalise the folding (by 180). The centre cone 22 locates the reinforced edge and stabilises the folded foil section; furthermore, the centre cone 22 guides the folded foil section 5 to the coiling device.

(20) With respect to the structure of the proposed device reference is made at first to FIGS. 5 and 6. Two rolls 13 and 14 are arranged on a carrier plate 15 symmetrically to a centre plane. Each of the rolls 13, 14 have an axis a which includes a small angle to the direction Q transverse to the conveying direction F. This angle can be seen in FIG. 6 and is mostly between 1 and 30.

(21) The conveying direction F lies in this centre plane. The two folding elements 11 and 12 are also arranged symmetrically in the mentioned centre plane. When the two folding elements 11, 12 are regarded in a direction N, which is perpendicular to the conveying direction F and which is perpendicular to a direction Q transverse to the conveying direction, which each consist of a bent sheet metal which is screwed on the carrier plate 15, a V-shaped contour of the folding edges of the folding elements 11, 12 becomes visible. The angle is denoted in FIG. 5; it is preferably between 15 and 40.

(22) Also, the centre cone 22 is arranged on the carrier plate via a holding arm, which centre cone is arranged in the centre plane and which locates and stabilises again the edges of the folded and running out foil sections 5.

(23) It was already said that it is a significant aspect of the invention that during the coiling of the foil sections 5 in the (not depicted) coiling devices the knifes 4 as well as also the folding device 6 are moved simultaneously oscillatory forth and back in direction Q transverse to the conveying direction F relatively to the coiling devices. For doing so synchronisation means 9, 10, 20 are provided between the knifes 4 and the devices which carry the same respectively and the folding devices 6. Those synchronisation means consist in the embodiment according to FIGS. 1, 2, 3, 5 and 6 of a pin 9 which is fixed on the carrier plate 15 and a connection part 20 which is connected with the knife 4. The carrier plates 15 are connected by means of the rail 9 with the oscillation drive 8. The pin 9 engages in recesses 10 of the connection parts 20 which are arranged on the knifes 4. This becomes apparent in the synopsis of FIGS. 1 and 3. Here can be seen that the oscillation drive 8 comprises a motor which drives a rail 9 extending in the direction Q in an oscillating manner; the carrier plates 15 are arranged on the rail 9. The pins 9 engage in the recesses 10 of the connection parts 20 which are arranged on the knifes 4. By the engagement of the pins 9 in the recesses 10 in the connection part 20 the synchronization with the knifes is established.

(24) In the embodiment according to FIG. 4 the synchronization means 9, 10, 20 are designed a bit different. Here a connection rail 10 is provided which extends transversally to the conveying direction F and which is connected with all knifes 4. The connection rail 10 establishes a coupling with the oscillation drive 8. The carrier plate 15 of the folding device 6 is connected with the rail 9. The rail 9 is also coupled with the oscillation drive 8. Accordingly, an oscillation of the folding devices is established here in the same manner in coupling with the knifes 4, transversally to the conveying direction F.

(25) As can be seen furthermore from the FIGS. 1 to 4 an actuator 16 is provided by which all folding devices 6 which are fixed on a carrier element 21 can be swivelled in engagement or out of engagement. In FIG. 1 the folding devices 6 are in operation, in FIG. 2 they are swivelled in a non-operation position.

(26) While specific embodiments of the invention have been shown and described in detail to illustrate the inventive principles, it will be understood that the invention may be embodied otherwise without departing from such principles.