FI107907B - Method, apparatus and roller for governing of a web of paper - Google Patents

Description

1 107907

Method, apparatus and roll for guiding the paper web

The invention relates to a method of guiding a paper web around a reel roll in a paper web reel, wherein a rotating reel roll 5 is brought into contact with a moving paper web, the paper web is cut and a new end of the web is guided around the reel roll. The invention also relates to apparatus for guiding a paper web around a reel roll in a paper web reel having a transfer device for bringing the reel roll into contact with a moving paper web and means arranged to deflect the web from its original full roll direction and guide it along the outside of the reel roll. The invention also relates to a roll for guiding a paper web, the outer surface of the roll being provided with deformable grooves.

15 The continuous paper roll rewinders roll continuous paper from a paper machine or paper rigid processing machine into a machine roll. To carry out the winding continuously, the web must be changed to run on a new roll when the old roll is full. Getting a web 20 meters wide and coming at a speed greater than 25 m / s around a reel core serving as a new reel is one of the most critical steps in the continuous winding process. This exchange operation involves bringing an empty reel reel into contact with the T: paper web over the reeling cylinder, cutting the web, and guiding the new end of the web around the reel reel. In the replacement 25, an impact blade cutter and / or air jets can be used. Various exchange methods have been presented e.g. U.S. Patent 5360179,. Finnish Patent Nos. 100590 and 100712; and German Patent Publication 3515519; and U.S. Patent 4,445,646. It is already apparent from these publications how to control the web with a new blank reel. A lot of auxiliary equipment around the 30 blades is required, and in many cases will have to be moved to the correct position at the correct position and, once the changeover has taken place, to a standard position where they are not in the • path of a growing roll. The web cut and control devices operating during the roll change sequence are one important part of the roll design work.

* · * 35

It is an object of the invention to provide a novel method of guiding a paper web during a roll change with a new, empty reel around the roll. In order to accomplish this purpose, the process according to the invention is essentially characterized in that the web is locked into deforming grooves on the outer surface of the reel roll.

The invention proceeds from the idea that the structure of the outer surface of the reel roll causes the web itself to grasp the roll and extend around the roll, thereby causing tearing of the web between the reel roll and the full roll. The solution may reduce or completely eliminate auxiliary devices for guiding the web around the reel roll, including suction means coupled to the reel shaft for pulling the web 10 through the perforations of the roll jacket through effective suction as disclosed in U.S. Patent 3,743,199.

The grooves are arranged on the surface of the reel roll in a circumferential direction and can be shaped so that they are locked by contact between the roll surface and the surface guiding the web 15. The grooves may be shaped such that their edges close, squeezing between the web and pivoting into a locked position over the pivot points of the pivoting movement due to the flexibility of the material of the grooves.

It is possible to carry out the method by changing the web to a new Tam drill roll with the old roll in a nip contact with the reeling cylinder or during the changeover the nip between the old roll and the reeling cylinder .T: open.

It is also an object of the invention to provide an apparatus for controlling a paper web. : for wrapping around a reel reel with fewer attachments. The apparatus for achieving its objectives is characterized in that the members arranged to deflect the web from its original, full-roll direction and guide it along the outer surface of the reel roll 30 are formed by deformable grooves on the outer surface of the reel roll.

• · · • · * * *:. ·. The invention will be described in more detail below with reference to the enclosed silicon. for cartilage with 35 «Figure 1 illustrates a method of changing between a winding cylinder and an old roll • 3 107907 Figure 2 illustrates a method of replacing a nip open, Figure 3 illustrates the method of Figure 1 or 2 prior to locking the web into a reel roll in axial section 5 Figure 4 illustrates a method of locking in the view of Figure 3, and Figure 10 shows a possible roll structure.

Figure 1 illustrates the method in general, using a reel roll 2 with a special surface structure, the structure of which will be described in more detail later. In the replacement of Figure 1, the web W enters the periphery of a roll 15 roll cylinder 15, where it rotates in a particular sector and passes through a nip N onto a machine reel R formed in the reel around its supported spool roll 2. The support structures of the spool roll supported by the roller and the loading devices which provide a certain line-20 load to the winding nip N between the roller R and the roller cylinder 1 are not specifically described herein and are therefore not limited to a particular type of roller.

··· • · · · ·

When the old roller R is full, a new empty reel reel 2 • · · 25 is brought from the reel stock with a transfer device (not shown) close to the reel cylinder 1.

: The reel roll 2 is accelerated to the web speed of the paper web. Unlike the conventional · · · I /, replacement reel 2, the reel roll 2 is applied to the web at web speed at the point where it passes as a free draw, i.e. before the web reaches the peripheral surface 30 of the winding cylinder 1 (dashed line 21). In this case, due to the resulting coverage angle and web width, the paper web W is first pressed against the profile shape of the outer surface of the roll 2.

• · ·

As the bobbin roller 2 continues to move toward the winding cylinder 1, it moves:. the free run of the web towards the winding cylinder 1 and finally the web W remains! · * ·! * · · The nip between the reel roller 2 and the reel cylinder 1 (dashed line 2 ") is currently subjected to a line-like pressure that changes the profile of the outer surface of the reel reel 2 such that the profile locks the web W onto the reel 2. 107907 4 following the nip between the reel roller and the reel roller to follow the reel roller and break at the same time, the web has changed to a new reel.

Fig. 2 shows a replacement in which the reel roll is first brought into contact with the web running on the surface of the reeling cylinder 1 in a known manner. The reel roll 2 is displaced along the periphery of the winding cylinder 1, for example, between a winding cylinder 1 and a full machine roll R driven apart from the winding cylinder, for example by an initial winding device. Since the web W is to be locked by a pressure contact between the reel roll and the outer guide surface at the point where the reel roll is in contact with the freely drawn web, a separate weight 15 roller or auxiliary roll 4 is used a line load or pressure contact between the reel reel 2 and the auxiliary reel 4 which causes a change in the profile shape of the reel reel 2 such that the web W locks on the surface of the reel reel. The web W then follows the surface of the Tam-20 wood roll 2 and tears between the reel roll and the full machine roll R.

.T: As in the case of Fig. 1, here too the reel roll 2 first comes into contact with the free-roll web W. This value ···: ·. In the 25-head stretch, the paper web passes through a surface of a reel roll

*. ·. : with an angle of coverage, and with an angle of coverage and web tension, the paper web W

first presses against and conforms to the profile shape of the outer surface of the roll 2.

:!: * The pressure contact caused by the auxiliary roller 4 provides locking analogous to the action of the winding cylinder 1. In order to prevent the winding cylinder 30 1 from affecting the surface of the reel roller 2 when it is moved to the position of figure 2, a device for moving the reel roller 2, for example a starter roller, is provided with special stops, i.e. stops. between the outer surface of the reel roll 2 and the web running on the surface of the reeling cylinder 1. When the web W is obtained by means of the auxiliary roller 4 around the reel • · * · * 35, the reel roll 2 can be driven immediately into a nip contact with the winding cylinder 1, for example by means of the actuators of the starting winders.

_ 107907 5 »

Figure 3 shows a surface profile of a spool reel 2 for providing the web in accordance with the invention with the roll. Figure 3 illustrates a situation in which the reel roll and web W are disengaged from the winding cylinder 1 or auxiliary roll 4, and the surface 5 indicated by these reference numerals in the upper part of the figure may denote either of the above alternatives which achieve the same effect. The outer surface of the spool roll 2 has parallel, circumferential grooves 3. The lateral edges of the groove are formed by projections 3a obliquely upwardly facing each other, with a narrow gap 3b between them, through which there is an outer connection 10 to a wider groove bottom 3c. The grooves 3 are parallel so that the projections 3a are always in pairs between the two grooves 3, the projections being directed in opposite directions from the narrow heel between the bottoms of the grooves 3. Fig. 3 shows how the free run of web W has come against the surface of the reel roll 2 within a given coverage angle and 15 has widened in width such that it follows the shape of the outer surface of the roll 2 closest to the projections 3a and the gap between the projections.

When the winding cylinder 1 or the auxiliary roll 4 comes into contact with the web W and the pressure releasing contact with the profile 20 of the outer surface of the spool roll 2, locking takes place in the end position shown in Fig. 4. As a result of the contact, the projections 3a on the edges of the groove 3 rotate closer to the axis 3c of the spool roll 2, i.e. the bottom 3c of the groove 3, whereby the gap 3b between them closes and the web W is squeezed between the ends of the projections. The locking becomes permanent due to the fact that the projections 25 3a, in a way, always "pinch" about a pivot point centered on two pairs of adjacent grooves 3 to a stable position where they are pivoted against the bottom surface of the groove 3 and further pressed against each other. This end position is on the other side of the aforesaid articulation line from the rest position of Figure 3. It is essential that at least the material of the projections 3a is elastic so that they can pivot against each other while flexing and continuing to pivot the web W between the ends over which they are approximately parallel to the interconnection between the articulations.

35. It is also important in designing the outer surface profile of the spool reel 2 that the web W, when in the resting position of Figure 3, can be so loose that it can be locked in two adjacent grooves ft _ 107907 6 r 3. Since the web does not passes directly between adjacent gaps 3b in the position of Figure 3, but against a low V-shaped recess remaining on the outer surface of a pair of projections 3a, the web can be stretched when the ends of said projections 3a are rotated farther apart toward the bottom of their grooves 3.

The protrusions 3a remain in the stable locking position shown in Fig. 4 as the reel roll rotates forward from the point of loading, although the loading force is exerted by the winding cylinder 1 or auxiliary roll 4. The loading surface closes the grooves 3 along the entire length as the spool roll 2 rotates past the point of loading and secures the web W along the length of the grooves 3 to the surface of the roll 2. The web W returns to its original track width immediately after the first lap. As the new web layers rotate around the reel roll 2 very soon the bottom of the reel will resemble that of a regular machine roll 15, so the special profile design of the outer surface of the reel roll 2 will have no effect on the roll structure.

Fig. 5 shows an alternative in which the grooves have the same shape and movement in locking as in Fig. 3. Here the grooves 3 are connected to the inner parts 20 of the roll 2 by holes 5 through the coating material and through the casing 5 of the roll 2. re-energize by feeding compressed air into the roll, for example, from the end of roll 2, and • · ·: For this purpose, a unit is provided at the end of the roll. If necessary, the holes 5 can be used to assist in closing the grooves so that a negative pressure is arranged inside the roll which also affects the grooves 3.

• · • · · • ♦ ·

Also, after unrolling, unwinding takes place in a normal manner regardless of the structure of the outer surface of the spool reel. The projections 3a can be returned to the position shown in Fig. 3 by introducing pressure-30 air into the grooves, so that the roll is ready for use again for winding.

• · ·· «

The dimensions of the above profiling may be small, so that the gripping phenomenon is obtained when driving the reel roller 2 and the winding cylinder 1 ··· *. · *. or the auxiliary roller 4 is fastened to each other at low speed, that is, the locking is obtained quickly. It is likewise preferred that the roll surface has a ratio of * / relatively close to smooth. One particular advantage of the method may be: V it is mentioned that the web sticks to the surface of the reel roll 2 very evenly and does not fold twice and does not produce the so-called. tail, which eliminates loose paper

M

7 107907 fin, "feed" generation of roll change. Dimensions depend on paper quality and other parameters. The upper part of the grooves, i.e. the slits 3b, preferably has a width of less than 10 mm.

The reel roll 2 is provided with a full width of the grooves 3 described above, whereby a full width change can be made, i.e. the web tears approximately directly transverse to its direction of travel. The grooves 3 may extend around the entire circumference of the roll or be restricted to a particular sector of the circumference.

The grooves 3 may also be transverse. Generally, the angle of the grooves relative to the axis of the roll can be selected to be optimal for operation.

In practice, the reel roll 2 may be manufactured by providing the outer surface of the roll with an elastic coating having the aforementioned grooves 3. As materials, many flexible materials, for example polyurethane, of suitable hardness are suitable. The coating may be molded into a mold having pull-out portions to provide narrower grooves 3 at the top. It is also possible to use soluble cores known in the plastic art to obtain otherwise difficult to cast shapes 20. The coating can be cast as a separate piece and then fixed onto a reel spool. If roll grooves are made, they do not need to be rotated exactly .T: circumferentially and spaced apart about roll 2, but can also be · 1 ”: also screw-threaded around the roll, for example, in two outwardly centering and opposite turns. In this case, one alternative may be to produce an elastic coating from a suitably shaped elastic band, which may be wrapped around a roll so that adjacent strands form grooves similar to Figure 3.

♦ * ί2: The roll of the invention may also be used in paper-handling processes other than winding of the paper if the process requires collecting the web around the roll.

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Claims (20)

A method of controlling paper web around a tambour roll at a paper web wheelchair in which a rotating tambour roll (2) is brought into contact with a movable paper web (W), the paper web (W) is cut off, and the new end of the web is guided around The tambour roller (2), characterized in that the web (W) is read into deformable grooves (3) which are on the outer surface of the tambour roller (2). 10 Method according to claim 1, characterized in that deformation of the groove (3) is achieved by means of the pressure between the tambour roll (2) and the surface located on the other side of the paper web. 15 Method according to claim 2, characterized in that the tambour roller (2) is first contacted with the free course of the paper web (W), after which the tambour roller and the other side of the paper web are moved closer together and in contact with each other. 20 Method according to Claim 1, 2 or 3, characterized in that the edges of the latch (3) clamp the web (W) between them by turning closer to each other and the central axis of the tambour roller (2). ··· • «• · I, ···. 25 Method according to claim 4, characterized in that the edges of the latch (3) face each other to the reading position at the other andra side of the connecting line between the articulation points of the turning movement. • *** 6. A method according to any of the preceding claims, characterized in that the tambour roller (2) is brought in the direction of a rolling cylinder (2) so that the paper web (W) remains between the rolling cylinder (1) and the tambour roller. (2). Method according to any one of the preceding claims 1 to 5, characterized in that the mutual distance between the tambour roll (2) and one from a rolling cylinder (1) separately auxiliary roller (4) is reduced:, :): until the paper web (W) remains between the tambour roller (2) and said :))) · the auxiliary roller (4). 12 107907 Apparatus for controlling paper web around a tambour roll at a paper web wheelchair, in which there is a moving device for bringing the tambour roll into contact with a movable paper web (W) and means arranged to deflect the web from the original, in the direction of a full roll (R) directed the route, and to guide it along the outer surface of the tambour roller, characterized in that said means is constituted by deformable grooves (3) located on the outer surface of the tambour roller (2). 10 9. Apparatus according to claim 8, characterized in that the moving device, such as a primary rolling device, is arranged to transfer the tambour roller (2) and a rolling cylinder (1) which guides the paper web (W) in the direction of the roller (R), in the nip contact. with each other equally so that the shape of the latch (3) is transformed into the one reading the paper web (W) under the influence of the nip contact. Apparatus according to claim 8, characterized in that it comprises an auxiliary roller (4) which is separate from a paper web (W) in the direction of the full roll (R) guiding rolling cylinder (1), the tambour roller (2) and the auxiliary roller. (4) are transferable in nip contact with each other, so that the web (W) remains between them and the latch (3) is transformed into a reading form under the influence of the nip contact. • · · • · • · · · ···. 25 11. Apparatus according to any of the preceding claims 8 to 10, characterized in that the edges of the lock (3) are arranged to be turned i to a reading position closer together and the center axis of the tambour roller (2). • · · · · · · · · · · 12. Apparatus according to claim 11, characterized in that the locking means; (3) edges are arranged to face each other to a reading position at the other side of the connecting line between the turning points of the turning movement. 13. A roll (2) for guiding a paper web, the outer surface of the roll (2) being provided with deformable grooves (3), characterized in that the roll is: ·; · 1 intended for gathering the paper web (W) around itself in a paper web: the processing device and the latch (3) are arranged to transfer to a reading position for reading the paper web (W) on the outer surface of the roll. • · · 13 107907 14. Vais (2) according to claim 13, characterized in that the edges of the latch (3) are arranged to be turned to a reading position closer to each other and the center axis of the roller (2). 5 15. Vais (2) according to claim 14, characterized in that the edges of the lock (3) are arranged to face each other to the reading position to the other side of the connecting line between the turning points of the turning movement. 10 16. Vais (2) according to Claim 15, characterized in that in the profile of the lock (3) according to the axial section of the roller, the edges (3) of the lock (2) are made of projections (3a) which are directed obliquely and towards one another and leave between them a slit (3). 3a) for fitting the web (W) in this tore reading. 15 Vais (2) according to any of the preceding claims 13-16, characterized in that at least the edges of the ratchet (3) are made of elastic material. 18. A roller (2) according to claim 17, characterized in that the latch (3) is formed in a surface layer of elastic material which is attached to the roller. Roller (2) according to any of the preceding claims 13-18, ·: ·. characterized in that the latch (3) is in communication with the inner part of the roller (2) through channels (5). ♦ · · » 20. Roll (2) according to any of the preceding claims 13-19, characterized in that it is a tambour roll of a wheelchair for a web of paper. • · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · • · • · · 1 · · · · · · · · ·