EP0562266A1 - Winder for winding a web, in particular a paper web - Google Patents

Abstract

The invention relates to a winding machine for winding a running paper web, having the following features: 1.1 two supporting rollers which form with one another a winding bed for receiving the paper roll; 1.2 the paper web loops round one of the two supporting rollers during operation; 1.3 the other of the two supporting rollers is lowered relative to the first supporting roller, so that a plane drawn through the axes of the two supporting rollers forms an angle to the horizontal. The invention is characterised by the following features: 1.4 the winding bed is formed solely from the two supporting rollers; 1.5 the second supporting roller has a casing which has a substantially higher deformability than the casing of the first supporting roller; 1.6 the two supporting rollers are at a fixed location. <IMAGE>

Description

Reference is made to the preamble of claim 1.

When winding webs, the winding hardness plays a role in the subsequent processing. With paper webs in particular, it is very important that the winding hardness has a certain course over the entire roll diameter. In general, the winding hardness should drop from a certain initial value to an end value. The waste should be as even as possible from the first to the last layer. It should have a certain gradient, i.e. not be too strong and not too weak. The course of the winding hardness should under no circumstances have jump points, e.g. a sudden drop.

This can only be achieved if certain measures are taken. If you do nothing, the line pressure between the roller and the support roller or the support rollers increases with increasing roller diameter, and with it the winding hardness.

To avoid this, use e.g. B. so-called rider rolls, which are arranged parallel to the supporting rollers. With these rider rolls you apply pressure to the roll. The contact pressure is controlled, being large at the beginning and decreasing with increasing roll weight.

The rider roller thus allows the line pressure and thus also the winding hardness to be influenced and controlled in the desired sense. However, if one wishes to produce a roll of very large diameter, the line pressure in the final phase of the winding is also very large. Likewise, the winding tension increases, so that the web can tear or crepe folds.

Other measures to influence the winding hardness are to distribute the load of the roll on the individual support rollers. For this purpose, support rollers of the same diameter have already been arranged in different horizontal planes, or support rollers of different diameters have been used. Furthermore, it is known that when winding on a support roller of smaller diameter, a harder winding is obtained than when winding on a support roller of larger diameter.

From DE-DM 7 310 606 a winding machine has become known which has two supporting rollers of the same size. One of these support rollers can be lowered during the winding process from an upper position above the horizontal plane of the axis of the other support roller at the start of the winding process. This lowering is intended to maintain a core that is firmly wound from the start.

US-PS 2 461 387 describes a winding machine which has two driven carrier rollers of different diameters; the carrier roller with the smaller diameter is provided with a coating with a higher coefficient of friction and driven at a higher speed than the other carrier roller. As a result, tensile stress is exerted on the outer layer of the web.

DE-OS 27 57 247 relates to a winding machine with supporting rollers of the same diameter. The winding hardness is controlled by changing the distance between the carrier rollers.

DE-PS 678 585 describes a winding machine with two support rollers, the first of which has a hard jacket and the second has a soft jacket. The axes of the two rollers are in the same horizontal plane.

DE 38 39 244 describes a winding machine with three support rollers. The first support roller is stationary, while the two subsequent support rollers are movable and are wrapped in a support belt. The winding hardness should be controlled over the roll diameter by means of the support belt and by changing the positions of the second and third support rollers. The support band should cause the largest possible support surface in order to lower the surface load. This winding machine is extremely complex. It also has a particularly serious disadvantage: as soon as the paper roll has grown in such a way that it is mainly carried by the support belt, the support belt can swing violently, so that the paper roll starts to "dance" and can be catapulted out of bed .

It has also been proposed to manufacture the shells of these two rollers from rubber in a winding machine with two support rollers. The support rollers had the same diameter, and the jacket had the same rubber hardness. However, this also causes the paper roll to swing and float.

EP 0 157 062 B1 describes a winding machine with two support rollers and a rider roller. The outer surfaces of all these rollers are formed from a large number of individual fluid chambers which are arranged axially next to one another and which form the entire outer surface of the roller in question with their individual outer surfaces. The support behavior of such a roller is naturally non-uniform due to the large number of impacts across the web width.

The invention is based on DE 31 21 039 C3, in which two support rollers are provided, the two support rollers being arranged such that - at least during a certain operating phase - the center axis of one support roller lies below the center axis of the other support roller. This prior publication leaves open which of the two support rollers, i.e. the one wrapped by the paper web, or the one not wrapped around, which is below.

The invention has for its object to design a winding machine according to the preamble of claim 1 so that it can be used to produce paper rolls that have an even larger diameter than known winding machines that the contact pressure (ie the maximum surface pressure on the support rollers) is limited is, so that the winding hardness does not increase disproportionately high, and that especially during winding no spaces, tears or folds occur, that the construction work is kept within reasonable limits, and that finally a secure guidance of the paper roll is ensured during the entire operation, so that no swinging or "dancing" of the winding roll occurs.

This object is solved by the characterizing features of claim 1.

The inventors selected the right combination from a large number of known or theoretically conceivable combinations of features. The two features are of decisive importance here: that the second support roller in the web running direction (which is not wrapped in the paper web) is lowered compared to the first, and that this roller in particular has a relatively flexible roller shell which has the characteristics of a "wide-nip" roller .

This characteristic of greater softness or compliance can be put into practice in various ways. Exemplary embodiments are known to the person skilled in the art. For example, an elastic roller shell can be selected, or the roller can be designed as a so-called floating roller, which has a rigid yoke, a relatively thin roller shell and a plurality of support elements which are provided between the yoke and the shell, or the roller can be used as a hose roller provided that the support from the support rollers is continuous across the width of the roller, unlike EP 0 157 062 B1.

The invention can also be applied to winding machines with so-called alternating winding. A machine-wide paper tape is broken down into a plurality of narrow strips and rolled up alternately left and right on a vertical plane. The paper roll weight can be relieved by clamping heads, which attack the ends of the respective sleeve on which the individual paper rolls are wound. However, there are limits to such relief since the sleeves are destroyed from a certain weight.

The following possibilities are created by the invention:
One needs to start with the weight relief by means of the clamping heads, even with larger reel diameters;
or you only need to apply lower relief forces;
or you can produce paper rolls of larger diameter with the same high relief up to the limit of the sleeve strength;
or you can work with simpler and therefore cheaper winding cores.

There are two basic principles for the alternating winding mentioned: the first principle uses three carrier rollers, namely a central roller and two satellite rollers arranged on the left and right. The second principle only provides a single backup roller.

The invention can also be applied to the first principle. Namely, according to the one characteristic feature, the single winding bed is formed exclusively from two support rollers.

It should be avoided that the two support rollers have the same diameter and at the same time have the same rubber hardness. Both carrier rollers can thus have a certain elasticity of their coats.

However, the degree of elasticity should be different.

Fig. 1

zeigt in schematischer Darstellung und in Seitenansicht eine erfindungsgemäße Wickelmaschine.

The invention and the prior art are explained in more detail in the drawing. The following is shown in detail:

Fig. 1

shows a schematic representation and a side view of a winding machine according to the invention.

Fig. 5

zeigt wiederum in schematischer Darstellung und in Seitenansicht eine weitere Ausführungsform einer erfindungsgemäßen Wickelmaschine.

Fig. 5 a

zeigt oben in einem Querschnitt (achssenkrecht) sowie in einem Längsschnitt (achsparallel) eine Tragwalze 2. Diese weist ein inneres Joch 70 auf, ferner einen Walzenmantel 71, der an stirnseitigen Deckeln 72 (nur ein einziger dargestellt) eingespannt ist. Der Ringraum 73 zwischen Joch 70 und Mantel 71 ist aufblasbar.

Fig. 5b

zeigt in schematischer Darstellung und in Seitenansicht eine weitere Ausführungsform einer erfindungsgemäßen Wickelmaschine, bei der Tragwalze 2 von einem umlaufenden Band umschlungen ist.

Fig. 5c

zeigt wiederum in Seitenansicht und in schematischer Darstellung eine Wickelmaschine, bei welcher die beiden Tragwalzen 1, 2 von einem Band umschlungen sind.

Fig. 6

ist eine Übersichts-Darstellung von 22 verschiedenen Walzen-Konfigurationen, und zwar gemäß dem Stande der Technik wie auch gemäß der Erfindung.

Figures 2 to 4 illustrate the structure of the second (soft) support roller according to the invention.

Fig. 5

shows again in a schematic representation and in side view a further embodiment of a winding machine according to the invention.

Fig. 5 a

shows at the top in a cross section (perpendicular to the axis) and in a longitudinal section (axially parallel) a support roller 2. This has an inner yoke 70, also a roller shell 71, which is clamped on the end caps 72 (only one shown). The annular space 73 between the yoke 70 and the shell 71 is inflatable.

Fig. 5b

shows a schematic representation and a side view of a further embodiment of a winding machine according to the invention, in which the support roller 2 is wrapped by a rotating belt.

Fig. 5c

shows again a side view and a schematic representation of a winding machine, in which the two support rollers 1, 2 are wrapped in a band.

Fig. 6

Fig. 3 is an overview of 22 different roller configurations, according to the prior art as well as according to the invention.

The winding machine shown in Fig. 1 has two support rollers 1 and 2, which together form a winding bed for receiving a paper roll 3. The paper roll 3 is formed by winding up a paper web 4. As can be seen, the web 4 is brought in from the bottom left and first wraps around the support roller 1. The paper roll 3 is loaded in a controllable manner by a loading or rider roller 5, in order to also reduce the print run to influence.

As can also be seen, the support roller 1 is at a higher level above the floor 6 than the support roller 2. The axis 7 of the support roller 1 and the axis 8 of the support roller 2 lie in a plane which forms an angle α with the horizontal . In any case, this angle α is an acute angle. In the present case it is of the order of 5 degrees. In practice, much higher values can be provided, for example 30 degrees. The preferred range is 0.5 to 20 degrees.

It is also important that the support roller 2 has a jacket which is much more deformable than the jacket of the support roller 1. In the present case, the material of the support roller 1 is steel, while the jacket 2.2 of the support roller 1 is made of rubber-elastic material.

Because of the inclined arrangement, the weight G of the paper roll 3 is distributed in different ways between the two support rollers 1 and 2. The component G2 of the paper roll weight is obviously larger than the component G1. Accordingly, the contact area A2 on the support roller 2 is also larger than the contact area A1 on the support roller 1. In the present case, A2 could be 1.6 × A1, for example.

$$\text{p₁ =}\frac{\text{N1}}{\text{A1}}$$

$$\text{p₂ =}\frac{\text{N2}}{\text{A2}}$$

$\text{p₁ ≈ p₂ (SOLL)}$

Hierin bedeuten im einzelnen:

N

= Normalkraft auf dem Mantel der Tragwalze

F

= Reaktionskraft auf der Papierrolle

p₁

= Auflagedruck auf der Tragwalze 1

p₂

= Auflagedruck auf der Tragwalze 2

Aufgrund der erfindungsgemäßen Anordnung und Gestaltung der Wickelmaschine ist es möglich, einen deutlich höheren Papierrollendurchmesser zu erreichen, als dies seither möglich war. Mit der hier beschriebenen Wickelmaschine läßt sich ein Durchmesser von etwa 1400 mm erreichen, stattbisher 1200 mm.The following relationships are aimed for:

$\text{N1 = F1 <N2 = F2}$

$$\text{p₁ =}\frac{\text{N1}}{\text{A1}}$$

$$\text{p₂ =}\frac{\text{N2}}{\text{A2}}$$

$\text{p₁ ≈ p₂ (TARGET)}$

Herein in detail mean:

N

= Normal force on the surface of the carrier roller

F

= Reaction force on the paper roll

p₁

= Contact pressure on the support roller 1

p₂

= Contact pressure on the support roller 2

Due to the arrangement and design of the winding machine according to the invention, it is possible to achieve a significantly larger paper roll diameter than has been possible since then. With the winding machine described here, a diameter of about 1400 mm can be achieved instead of 1200 mm.

The support rollers shown in FIGS. 2 to 4 are possible variants of the jacket of the support roller 2.

In the embodiment according to FIG. 2, the jacket initially has an outer layer 20 which has a closed surface. This layer 20 can be steel, rubber or another material. A spirally rotating helix is screwed into the flesh 21 of the jacket in such a way that a web 22, also spirally rotating, remains. A hose 23 is inserted into the helix and is inflatable. Instead of a single hose, several hoses can of course also be provided.

3 has an outer layer 30 made of rubber, furthermore an inner layer 31 made of steel. Many chambers 32 are provided in the rubber layer, which - as seen in sectional view A-A - have a circular shape.

The embodiment according to FIG. 4 shows a jacket which is made up of three different layers, namely - seen from the outside inwards - a hard rubber layer 40, a soft rubber layer 41 and a steel body 42.

In the embodiment according to FIG. 5b, a fixed pressure element 2 is provided instead of a revolving support roller, furthermore a revolving belt 50 and a revolving guide roller 51. The belt 50 wraps around both the stationary support body 2 and the revolving guide roller 51. The stationary support body 2 has shoe elements 52 on, which can be pressed by pneumatic or hydraulic pressure against the inner surface of the circulating belt 50 and thus generate a pressure. This pressure is distributed over a larger area - seen in the direction of rotation of the belt 50 and also the paper roll 3, so that the surface pressure is relatively low. A lubricating device 53 reduces the sliding friction between the belt 50 and the fixed support body 2.

Finally, FIG. 6 shows a large number of variants - a total of 22 - of which only variants I, II and III represent configurations according to the invention.

The first support roller 1 will generally have a steel jacket. However, it can also have a rubberized coat. It is essential that the condition of the jacket of the second support roller is such that there is a "wide nip effect" on the second support roller compared to the first.

Claims (6)

Winding machine for winding a running paper web (4), with the following features: 1.1 two support rollers (1, 2), which together form a winding bed for receiving the paper roll (3); 1.2 one of the two support rollers (support roller 1) is wrapped in the paper web (4) during operation; 1.3 the other of the two support rollers (2) is lowered relative to the first support roller (1), so that a plane through the axes of the two support rollers (1, 2) forms an angle with the horizontal; characterized by the following features: 1.4 the changing bed is formed exclusively from the two support rollers; 1.5 the second support roller (2) has a jacket which is much more deformable than the jacket of the first support roller (1); 1.6 the two support rollers are stationary. Winding machine according to claim 1, characterized in that the diameter of the support roller (2) is approximately 1.05 to 2 times the diameter of the support roller (1). Winding machine according to claim 1 or 2, characterized in that the angle between the plane defined by the axes of the two support rollers and the horizontal is between 1 and 20 degrees. Winding machine according to one of claims 1 to 3, characterized in that at least the outer layer of the casing of the supporting roller (2) consists of rubber, and that the rubber hardness is between 30 and 120 degrees P&J. Winding machine according to one of claims 1 to 4, characterized in that the outer layer of support roller 1 has a jacket made of elastic material. Winding machine according to one of Claims 1 to 5, characterized in that the support roller 1 and the support roller 2 have an outer jacket layer made of elastic material, and that the elasticity of this layer is greater in the support roller 2 than in the support roller 1.

Images