FR2646182A1 - PAPER OR CARDBOARD FINISHING PROCESS - Google Patents

Abstract

The invention relates to a method of finishing paper or board, in which the winding of the continuous sheet W from a paper machine, a coater or the like is carried out on take-up drums T. In this method. , the full coils are transferred from the winding station (s) RK 1, RK 2 to one or more unwinding stations RA 1, RA 2. The empty winding drums T which become free in the unwinding station or stations RA 1, RA 2 are transferred to said winding station or stations RK 1, RK 2. The coils formed on the winding drums T are transferred from the winding station RK 1, RK 2 to the unwinding station RA 1, RA 2, while the empty winding drums T are transferred from the unwinding station RA 1, RA 2 to the winding station RK 1, RK 2 using transfer means 50, 70 and rail arrangements 22, 28, 44, 60, 67 permanently disposed between said stations and said stations. The transfer means 50, 70 and the rail arrangements are controlled by an automated sequence so that when the transfer step of a take-up drum T or a reel R is completed, the next transfer step takes place automatically without being started manually.

Description

The invention relates to a method for finishing paper or cardboard.

  for finishing paper or cardboard, in which the winding of the continuous sheet coming from a paper machine, a coater or the like, is carried out on winding drums, process in which the full reels are transferred from the winding station (s) to one or more unwinding stations, and in which the empty winding drums which have been released in the unwinding station (s) are transferred to the or

said winding stations.

  When setting up paper or cardboard finishing equipment such as calenders, slitters and unwinders or rewinders in a paper mill, there are a number of factors to consider. One of the most important points concerns the main production line. The various devices must be placed so that it is possible to advance regularly in the main production line without unnecessary displacements or lifting of the reels. The way in which

  moving the main product around the factory is also important.

  The lifting capacity and its optimized use also depend on the locations of the various finishing devices. The joint use of personnel for various devices must also be taken into account. It is known in the prior art to place, for example, supercalender on two floors, among other things, so that the lifting height of the crane does not become unnecessarily high. It is also known in the prior art to place a peeling station at the

machine level.

  In the following, as a starting point of the present invention, a typical prior art installation of finishing equipment will be described, as will an arrangement for transferring paper reels and circulating winding drums. . When using supercalender placed opposite each other, several units of said supercalender can be placed side by side, one

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  -2- typical arrangement is to place the unrolling stations of the supercalender at the machine level, and the rewinders at ground level opposite each other. The full reels are transferred by means of overhead traveling cranes in the hall of the paper machine to the slitters which are placed on the same line as the supercalender. Correspondingly, the empty winding drums from the slitting unwinding station are also transferred by means of a suspended overhead crane and deposited on

  supports placed above the rewinding station of the supercalender.

  As is apparent from the above and in a manner known in the prior art, suspended overhead traveling cranes are used both for the transfer of full reels and for the circulation of empty winding drums. This increases the number of suspended overhead traveling cranes required and can interfere with the smooth running of production, especially when the overhead traveling overhead traveling cranes take on other work such as maintenance work. The labor requirements are also very high and the transfers which take place by means of the overhead traveling cranes cannot be automated. The operation of suspended overhead traveling cranes involves

  also some security risks.

  The object of the present invention is to provide a new process of the type in question, by means of which the major part of the

  disadvantages discussed above can be avoided.

  A particular object of the invention is to provide a process for the transfer of full reels and the circulation of empty winding drums which results therefrom by which the subsequent operations of the various devices can be organized so as to take place automatically at the end of the previous operation, so that staff do not have to ensure the start of operations. Another aim concerning this objective is that the number of people involved in the operation can be reduced, the additional operators which are needed in special situations or in the event of breakdowns being in

  general available on other machines.

  A particular object of the invention is to provide a method of the type indicated by means of which it is possible to reduce the number of

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overhead traveling cranes.

  Another object of the invention is to provide a process of the type indicated in which the various operations can be made automatic and take place in a more regular and faster manner so that certain finishing equipment and the finishing process itself can serve for one more paper machine

large production capacity.

  To achieve the objectives indicated above and those which will emerge later, the invention is mainly characterized in that in this process the coils formed on the winding drums are transferred from the winding station to the post of unwinding, while the empty winding drums are transferred from the unwinding station to the winding station using the transfer means and the rail arrangements permanently arranged between the stations and the stations, and by the fact that said transfer means and rail arrangements are controlled by an automated sequence so that when a previous transfer step of a winding drum or reel is completed, the next transfer step takes place automatically without having to 9st started

manually.

  In what follows, the invention will be described in detail with reference to an embodiment of the invention given by way of example and shown in the figures of the accompanying drawings, the invention being in no way strictly limited to details of this mode of

production.

  Figure 1 shows the start of a finishing operation taking place after a paper machine in the same production line as the paper machine, from the last drying cylinder of the

  paper to the supercalender rewinding station.

  Figure 2 shows the end which completes the finishing operation from the rewinding station of the supercalender to the slitter. In the accompanying drawings and due to the size available for the drawing, it was necessary to show the finishing process according to the invention by two separate figures, Figure 1 showing the

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  -4- start of the finishing operation and Figure 2 showing the end of this operation up to the slitter. In Figures I and 2 are shown

  the vertical planes A-A which coincide with each other.

  In Figures 1 and 2, the level of the machine is indicated by the reference numeral 100 and the ground level by the reference numeral, the difference in height between them being "H". On the left side of Figure i are shown the last drying cylinder 10 and the upper wire cloth 11 of the paper machine. Starting from the last drying cylinder 10, the continuous sheet W is passed through O the calender 12 of the machine and the guide roller 13 to the rewinder 20 which is for example a reel of the Pope type or equivalent, the continuous sheet W being wound in a manner known per se on the empty winding drum T3 which has been assembled with the winding cylinder 21 of said winding machine in the winding station RK1 '. The full coils R1 are moved forward, supported by the end portions of the winding drums, along a pair of rails 22 with which the number is linked

  necessary delay and stop stations.

  The two rails 22 are in the same production line as the paper machine, and in connection with it, and before the unwinding station RAi is provided a reel carriage 23 on which a full reel R2 can be supported. The carriage 23 can be transferred in transverse direction on its wheels along the rails 24 to another production line so as to pick up or pick up a reel on the line. The coil R2 can be transferred by means of a mechanism 25 on supports 26 to the unwinding station RAi of the supercalender 30, the coil placed in said position being designated

by the reference R3.

  When the coil R3 has been fully unwound and guided, an empty winding drum becomes free in the unwinding station 26 and it is transferred by means of a lever mechanism 27 to the position T1, from which the winding drums which roll while being supported by their end portions, are transferred to the pair of rails 28 which is inclined downwards at an angle "a". The two rails 28 are equipped with delay and stop stations 29 which make it possible to be certain that the winding drums T are rolling at a sufficiently slow speed while maintaining their alignment with the waiting station T2 placed at the above the winder 20. The first empty winding drum T3 placed on the remote control stop device 28 is in the position from which the primary forks of the winder 20 will pick it up and transfer to the winding position placed in connection with the winding cylinder 21. In the manner described above, a closed-loop circulation of the winding drums T is obtained, which is arranged so as to be guided by a control unit 90 (shown only schematically). The control unit 90 supplies control pulses pl ... p2 to the various devices which control and determine the circulation of the winding drums and the transfer of the coils R. In addition, feedback signals fl1.'fk reach .the control unit 90, for example of various detectors (not shown) connected to the rails 22 and 28 in the same way as with the transfer devices 23, 25 and 27. Thus, by being controlled by the automated sequence , the various operations can be linked to each other so that the individual operations which were manual and carried out by means of an overhead crane suspended in the prior art take place automatically when the previous operation is completed. In this case, staff need not watch over the

  start and stop of various operations.

  Starting from the coil R3, the continuous sheet W1 is unwound and passed to the supercalender 30 constituted by a stack of calenders which is supported at ground level 200 and in which, in a manner known per se, soft and hard rollers 32 are placed one above the other in the grille stack. On the front side of the grille 30 and mounted on the chassis 34 are provided storage spaces for reserve coils 32. The supercalender 30v includes its own crane 35, for example for replacing rollers or other operations of minor service. The chassis of the supercalender 30 is designated by the reference numeral 33, Starting from the supercalender, the continuous sheet W2 passes around the rolls of -6-

  guide 36 to the rewinding unit RK2 of the supercalender.

  As shown in Figure 2, the continuous sheet W2 which comes from the supercalender 30 is wound in the rewinding unit RK2 so as to form a coil R5 on a winding drum T which is sent from position T5A to the winder 40 by a vertical conveyor 70. A full reel R5 is transferred from the winding unit 40 by means of a transfer mechanism 42 to position.R6 and from there further on the winding drum carriage 43 , on which the coil R7, which is deposited on supports on the carriage, can be transferred on the wheels of the carriage 43 and on transverse rails 44 to another processing line. Alternatively, by means of the carriage 43, a coil can be brought into the processing line shown in the figures and

  transferred along the rails 44 to the position R8.

  From position R8, the transfer mechanism 45 transfers the reel to position R9A, in which it is supported by the support members of the lifting device 50, essential for the invention, when the support members 51 of the lifting device are in their low position 51A. The lifting device 50 comprises a pair of support members 51 which are moved in synchronism by means of a drive mechanism known per se and which may for example comprise a transmission by a catenary, a hydraulic cylinder or any other equivalent motor . It is essential for the operation of the lifting device 50 that it transfers the coils from position R9A from ground level 200 to level 100 of the machine in the

position R9y.

  In FIG. 2, the coils R9y which rest on the support members 51y in the high position are transferred by passing through a door 61 which can pivot around axes 62 when the door is in its low position, to reach the rails 60 which are supported by vertical beams 65. A winding drum carriage 63 on which the coil R10 can be placed can run on the pair of rails 60. The coil R11 which rests on the carriage 63 can be transferred to the wheels of the carriage 63 and brought to the rails 64 of another line, or correspondingly a coil can be brought to the carriage located on the processing line shown in the figures. After the carriage 63, the coils supported on the rails 60 and located in various stopping stations are designated by the reference R12. At least one of the coils R12 is transferred by a transfer mechanism to the unwinding position RA2 of the slitter 80. When a coil R13 placed in the unwinding position RA2 is empty, an empty winding drum T becomes free and is transferred by a lifting mechanism 66 to a support constituted by a pair of rails 68 placed above the unwinding position RA2, position in which is shown an empty winding drum T4. The two rails 68 are inclined downward at an angle "a", and stop and delay stations 67 are connected with them and ensure an undisturbed transfer of empty winding drums T4 from position T4 to the position T5. As a rule, the angle "a" is between 1.0 and 1.5 degrees. A vertical conveyor 70 is connected to the lower ends of the rails 68 and comprises pairs of supports 71 which, in their upper position 71y, support the empty winding drum T5y which is then transferred by the vertical conveyor 70 to the lower position TSA, the supports 71 being at this time in position 71A, above the rewinding station RK2 of the supercalender. From the TSA position, the empty winding drum T is transferred to the supports of the rewinding station RK2 and a new coil R is formed on said winding drum T. The circulation R ... R13 of the coils formed around winding drums-T can be arranged so as to be effected under the effect of an automatic control by means of control pulses P of the control unit 90 without using a suspended overhead crane or corresponding cranes . In addition, an essential characteristic of the invention is that the circulation of the winding drums T, which comprises the transfer of empty winding drums from the unwinding position RA2 to the rewinding position RK2 also takes place under the action of an automatic control by the control unit 90 without transfers by overhead traveling cranes and / or without

manual operations.

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  An essential characteristic of the operation of the system 90 which controls and monitors the process of the invention is that, thanks to the monitoring signals f1. FK, the system is informed of the state of the finishing process at any particular time. The signals fl ... fK are received from various limit switches, photocells, angle sensors or the like, by means of which the way in which the coils and winding drums move and the operating stages are monitored. various transfer devices. The system 90 provides pl ... pN control pulses based on the control data applied to the system 90. An appropriate amount of "intelligence" can be programmed in the system 90, thereby optimizing the operation of the finishing lines in various situations. The system 90 can be implemented by means of a process computer, microprocessors or by means of programmable logic, mime than by means of various detectors and devices

  control and actuators known per se.

  The invention can be implemented in very different finishing lines. Instead of a paper machine of the embodiment shown by way of example in FIGS. I and 2, it may for example be a coater, and it is possible to envisage in the position of the

  supercalender a soft grille or equivalent.

  The invention can be used in all combinations of finishing equipment in which there is a need for a transfer of the reels from a winding position to a unwinding position and the return transfer of empty winding drums from the unwinding position to the winding position. An essential characteristic of the invention also consists in the fact that the various transfers take place by being controlled by an automated sequence without having to use a suspended overhead crane or equivalent cranes, said cranes having other functions to fulfill. Thus, one can obtain a transfer of the coils and a

  winding drum circulation without disturbances and regular.

  As is obvious, and as already follows from the foregoing, the invention is in no way limited to those of its embodiments, no more than those of the embodiments of its various parts, _ 9 _ having been more specifically contemplated; on the contrary, it embraces

all variants.

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Claims (9)

  1. A method for finishing paper or cardboard, in which the winding of the continuous sheet (W) coming from a paper machine, a sizing machine or the like takes place on winding drums (T), process in which full reels are transferred from the winding station (s) (R1 'RK2) to one or more unwinding stations (RA1, RA2), and in which the empty winding drums (T) which become free in the unwinding station (s) (RA1, RA2) are transferred to said winding station (s) (R1 'RK2), characterized in that in this process, the coils formed on the winding drums (T) are transferred from the winding station (R1 ', R2) to the unwinding station (RA1, RA2), as well as empty winding drums (T) are transferred from the unwinding station (RAi, RA2) to the station winding (R1 'RK2) using transfer means (50, 70) and rail arrangements (22, 28, 44, 60, 67) arranged in a fa on permanent between said stations and stations, and in that said transfer means (50, 70) and the rail arrangements are controlled by an automated sequence so that when a previous step is completed for the transfer of a drums winding (T) or a coil (R), the transfer step   next takes place automatically without being started manually.   2. Method according to claim 1, characterized in that in this method, full coils (R9A) are transferred from the ground level (200) to the level (100) of the machine using a lifting step, which is carried out by means of a lifting device (50) (figure 2).   3. Method according to claim 1 or 2, characterized in that in this method, the empty winding drums (T1, T4) which become free in one or more unwinding stations (RA1, RA2) are transferred along a pair of rails (28, 68) placed above the transfer path (22, 60) intended for solid coils (R),   to the winding station (RK1) or the above station (RK2).   4. Method according to claim 3, characterized in that one uses for said pairs of rails (28, 68) a transfer arrangement for the empty winding drums (T) which is inclined towards - he -   the bottom in the direction of transfer at a small angle (a) which is preferably between 1 and 2, and which operates by the force of gravity.   5. Method according to claim 3 or 4, characterized in that the empty winding drums (T) are transferred from the position (T5y) placed at the lower end of said pair of rails (68) by means of a vertical conveyor (70) or by means of the primary forks of a Pope type winder to a lower position (Ts5A) from which the empty winding drum (T) is transferred and brought to the support of the winder (20, 40), and a coil (R5) is formed on the winding drum.   6. Method according to any one of claims 1 to 5,   characterized in that the method is used in a finishing process in which the continuous sheet (WO) which arrives from a paper or cardboard machine (10, 11) or from a coater is sent to the winder (20 ), the coils formed on said winder being transferred under the action of an automatic control along rails (22) or the like to an unwinding station (RAi) from which the empty winding drums (T1) are transferred along pairs of rails (28) arranged above said rails (22) and inclined (angle "a") towards the winder (R1) towards the position (T3) from which the empty winding drums (T) are transferred by means of the transfer members of the rewinder (20) to the position winding.   7. Method according to claim 6, characterized in that said unwinding station (RAi) is the unwinding station of a supercalender (30) and in that the rewinding station (RK2) of said supercalender (30) is placed at ground level (200) and from which the full coils (R) are transferred by a   lifting (50) to the level (100) of the machine.   8. Method according to any one of claims 1 to 7,   characterized in that after the rewinding station (RK2) of the supercalender or equivalent, the full coils (R) are transferred by automatic control along rails (44, 60) or equivalent to an unwinding station (RA2) from which the empty winding drums - 12 -   (T) which become free are transferred along pairs of rails (68) inclined downwards, in connection with which are provided   stop stations (67), above the winding station (RK1).   9. Method according to claim 8, characterized in that in this process full coils (R) are transferred from the rewinding station (RK2) of a supercalender (30) or equivalent first on the first rails (44) , whereupon the full reels (R9A) are raised from the ground level (200) to the level (100) of the machine by means of a lifting device (50), support from which the full reels ( R9y) are transferred along second rails (60) to an unwinding station (RA2), which is preferably the unwinding station of a slitter (80), and in that the empty winding drums (T) which become free and which come from the unwinding station (RA2) are raised by means of a transfer mechanism (66) on the support formed by the two rails (68) which are provided above, which are inclined downwards (angle "a") and along which the empty winding drums (T) roll above said station rewinding (RK2) from which the empty winding drums (T5y) are transferred by means of the supports (71) of a vertical conveyor (70) to the lower position (Ts5A) from which the empty winding drums (T ) are transferred to the support of the rewinding station (RK2) and the winding is carried out, after which the steps described above are repeated in closed circulation under the command of an automated sequence without transfers by overhead traveling cranes and without manual transfers or control operations.