Process and device for reeling a paper web

Abstract

The invention relates to a process for reeling a paper web, particularly a tissue web, specifically when starting up the machine and after a web break. According to the invention, this is achieved by pressing the paper web tail (8′) or the entire width of the web onto the reel drum (5) and securing it there by means of an auxiliary roll (9) before it is transferred to the reel spool (3). The invention also relates to a device for reeling a paper web, particularly a tissue web, specifically when starting up the machine and after a web break, using a reel spool (3) and a reel drum (5). An auxiliary roll (9) is provided in addition to press a paper web tail (8′) or the entire web width onto the reel drum (5) and secure it there.

Description

BACKGROUND OF THE INVENTION

The invention relates to a process for reeling a paper web, particularly a tissue web, specifically when starting up the machine and after a web break. In addition, the invention relates to a device for reeling a paper web, particularly a tissue web, specifically when starting up the machine and after a web break, using a reel spool and a reel drum.

Processes and devices are known in which the tail feed strip is reeled onto a reel spool or a winding tube, on or to which an adhesive or an adhesive strip has been applied manually over the entire web width. An automatic adhesive application device is known from U.S. Pat. No. 6,253,818. The adhesive can also be applied to the paper web ahead of the reel spool using spray nozzles. In these known processes, only a tail strip is wound onto the reel first of all, thus causing unevenness when the paper web then becomes broader to extend over the machine width. In addition, air entrapment may occur, which can cause the web to run off track. Due to the unevenness over the web width, particularly the equipment for measuring the web tension and corresponding control device (winding tightness control) can no longer be used.

SUMMARY OF THE INVENTION

The aim of the invention is thus to transfer the full web width onto the reel spool or winding tube when feeding in the web or after a web break. This method can also reduce the amount of broke.

According to the invention, this is achieved by pressing the paper web tail or the entire width of the web onto the reel drum and securing it there by means of an auxiliary roll before it is transferred to the reel spool. In this way, the web tail or the entire web width can run over the reel drum without the disadvantages of having to be wound onto the reel spool.

In one aspect, the invention is directed to a process for reeling a paper web having a main portion of nominal web width and a front portion of any width up to the nominal width, onto a reel spool rotating at a machine speed adjacent to a rotating reel drum. The steps include feeding the front onto the reel drum while the reel spool is spaced from the reel drum and pressing and holding the front portion against the reel drum whereby the front portion follows the rotation of and then separates from the reel drum. While the front portion is pressed and held against the reel drum, the reel spool is brought up to machine speed and substantially simultaneously, the reel spool is pressed against the web on the reel drum and the web front portion of the web is severed, thereby exposing a leading edge of the web main portion. The exposed edge is directed to the reel spool and the web main portion is wound around the reel spool at machine speed.

The front portion can be a tail having a free end and a width that increases from less than half the nominal width at the free end to the nominal width at the main portion. Alternatively, the front portion is a continuation of at the same width as the main portion.

An advantageous further development of the invention is characterized by the auxiliary roll being at a standstill, however it can also be operated in creep mode or accelerated to and then operated at production speed. Thus, the paper web tail can be placed easily over the reel drum when first fed in after a shutdown and can also be inserted again quickly after a web break.

A favorable embodiment of the invention is characterized by the paper web tail being diverted into a pulper after the reel drum until the web has the required width. This provides a favorable means of transferring the web in its the entire width.

A particularly favorable further development of the invention is characterized by an adhesive being applied to the reel spool so that the full width of the web can be transferred instantly to the reel spool. With this step, the entire web can be wound directly onto the reel spool without unevenness occurring at the edges.

The invention also relates to a device for reeling a paper web, particularly a tissue web, specifically when starting up the machine and after a web break, using a reel spool and a reel drum. According to the invention, this device is characterized by an auxiliary roll being provided in addition to press a paper web tail or the entire web width onto the reel drum and secure it there.

If the auxiliary roll has a design that is suitable for pressing onto the reel drum, the paper web can be secured to the reel drum particularly well. If the auxiliary roll can be lifted off the reel drum, this will prevent anything from influencing normal production operations. If the auxiliary roll has a drive to accelerate to production speed, transfer of the paper web tail or the entire web width can be performed particularly favorably until the web is received on the reel spool.

If a device is provided for applying adhesive to the reel spool, the entire web width can be transferred particularly well to the reel spool without any unevenness over the web width. This results in a sharp drop in the amount of broke.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will now be described in examples and referring to the drawings, where

FIG. 1 shows a state-of-the-art reeling device;

FIG. 2 contains a schematic diagram of the invention feeding in the web tail;

FIG. 3 is a schematic diagram of the invention with the web being transferred to the reel spool; and

FIG. 4 is a schematic diagram of the invention in continuous winding operation.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

FIG. 1 shows the arrangement of a reeling device 1 for a paper machine, particularly a tissue machine, where the paper is wound onto a reel 2. The empty reel spool 3 has a rubber covering or is fitted with a core shaft 3′ and brought from a storage area into position 3″ to a reel drum 5 using a lever 4. From there, the reel spool 3 is swung in direction 6 towards the full reel, where the paper is cut over the entire width in continuous operation, and reeling continues immediately onto the empty reel spool 3. This embodiment has an adhesive applying device 7 mounted above the storage position for the empty reel 3 to apply adhesive to the empty core shaft 3′.

FIG. 2 shows the invention with a front portion 8′ such as a web tail being fed to a reel drum 5. A web guiding device is used to feed the paper web tail into the space between the reel drum 5 and the auxiliary roll 9, where the auxiliary roll 9 is either at a standstill, or running at creep or any other desired speed. Subsequently, the auxiliary roll 9 is pressed onto the reel drum 5 and thus secures the web tail 8. After leaving the reel drum 5, the web tail 8 is diverted into a pulper (not shown). This is where web widening begins, i.e. the web tail broadens until it reaches the full web width. Then it can be cut lengthwise in one or more places using a slitter. At the same time, an empty reel spool 3 (position 3a) from the reel spool magazine is brought to the reel spool lift (lever 4) and adhesive 10 is applied to the reel spool 3 (in position 3b) using an adhesive applying device 7. As an alternative, an adhesive strip can also be applied over the entire web width. The reel spool is then placed in the primary arm of the winder 1 using the reel spool lift.

FIG. 3 illustrates the status when the entire (main) web portion 8 is transferred to the reel spool 3. The reel spool 3 is brought to machine speed in position 3c and then pressed onto the paper web 8 running over the reel drum 5 in position 3d. At the same time, the entire web is detached instantly, i.e. within a fraction of a second, and wound immediately onto the reel spool 3. It can be appreciated from FIG. 3 the reel drum 5 has a rotation axis and four quadrants centered on the axis, and that preferably, the auxiliary roll 9 and the reel spool 3 are situated at respective adjacent quadrants, with the auxiliary roll upstream of the reel spool. Since the paper web widens on the reel drum 5 from the web tail to the full web width during the start-up procedure, and also after a web break should the situation arise, the web can also be transferred to the reel spool right away with its full width and need not be allowed to widen during winding on the reel spool, as was the case to date, which would lead to the unevenness and problems described above.

FIG. 4 shows the situation during continuous winding of the paper web 8 onto the reel 2, where the auxiliary roll 9 is lifted off the reel drum 5 here and thus, there are no obstacles for the paper web.

The invention is not limited to the variants shown. It can be used in any paper machine, but does bring advantages in tissue machines because it is particularly important here to have even web distribution over the web width and because, due to creping, there is also a particular risk of air entrapment between the layers of the paper web on the core shaft, which could thus cause web displacement. There are various possibilities for transferring the web to the reel spool, where the embodiment with adhesive and instant transfer of the entire paper web is particularly advantageous.

Claims

1. Process for reeling a paper web having a main portion of nominal web width and a front portion of any width up to said nominal width, onto a reel spool rotating at a machine speed adjacent to a rotating reel drum, comprising: feeding the front portion onto the reel drum while the reel spool is spaced from the reel drum; pressing and holding the front portion against the reel drum whereby the front portion follows the rotation of and then separates from the reel drum; while the front portion is pressed and held against the reel drum, bringing the reel spool up to machine speed; substantially simultaneously, pressing the reel spool against the web on the reel drum and severing the web front portion, thereby exposing a leading edge of the web main portion; and directing the exposed edge to the reel spool and winding the web main portion around the reel spool at machine speed.

2. Process according to claim 1, wherein the front portion is a tail having a free end and a width that increases from less than half said nominal width at the free end to said nominal width at the main portion.

3. Process according to claim 1, wherein the front portion is a continuation of, at the same width as, the main portion.

4. Process according to claim 1, wherein the front portion of the web upon separation from the reel drum, is directed to a pulper.

5. Process according to claim 1, wherein an auxiliary roll presses and holds the front portion of the web against the reel drum.

6. Process according to claim 1, wherein while the main portion is winding around the spool at machine speed, the auxiliary roll is retracted from the reel drum.

7. Process according to claim 1, wherein the auxiliary roll is at a standstill.

8. Process according to claim 1, wherein the auxiliary roll is operated in creep mode.

9. Process according to claim 1, wherein the auxiliary roll is accelerated to and then maintained at a target speed.

10. Process according to one of claim 2, wherein the paper web tail is diverted into a pulper after the reel drum until said separation.

11. Process according to claim 1, including applying an adhesive to the reel spool.

12. Process according to claim 1, wherein the full width of the web is transferred instantly to the reel spool.

13. Device for reeling a paper web onto a reel spool located downstream of and cooperating with a rotating reel drum, wherein the improvement comprises an auxiliary roll upstream of the reel spool for pressing and holding the web against the reel drum.

14. Device according to claim 13, whereby the auxiliary roll is movable between an active position against the reel drum and a retracted position spaced from the reel drum.

15. Device according to claim 13, wherein the reel drum has a rotation axis and four quadrants centered on said axis, and the auxiliary roll and reel spool are situated at respective adjacent quadrants.

16. Device according to claim 13, wherein the auxiliary roll is rotatably drivable at a selected variable speed.

17. Device according to claim 13, including an adhesive application for the reel spool.