FI120161B - Grooved roll, disc element for forming a grooved layer into a grooved roll and method for making a grooved roll - Google Patents

Description

CARRIER ROLLER, TAPE ELEMENT FOR SHAPING THE CARRIER LAYER AND METHOD FOR MANUFACTURING THE CARRIER ROLL

The invention relates to a groove roll for use in forming a vacuum in a web forming machine, and the groove roll has a body and a groove layer.

Patent application FI 20031461 discloses a roll in which the open surface structure is connected in a closed manner to the roll axis. The roll of this structure 10 can be used on a web forming machine at many positions to create vacuum in connection with the roll. The open surface structure of the roll consists of separate grooves between which are provided with heels. Disc milling and turning are mentioned as some of the possibilities for grooving the roll. Further, 15 of these applications mention the implementation of grooving by welding, gluing or mechanically locking separate disc discs to the surface of the frame drum. The disc discs may be metal, polymer or a combination of several materials.

20 By prior art methods, manufacturing a groove roll is expensive. The brackets between the grooves are made of metal in the prior art to provide rolls of sufficient strength. Real examples of implementation can only be found on metal. The manufacture of prior art structures is typically cumbersome and expensive. Furthermore, when the groove roll is metal, it is remarkably heavy.

The object of the invention is to provide a new type of groove roll for use with a forming machine for forming a vacuum. The groove roll according to the invention can be made dimensionally accurate regardless of the groove casting method. Characteristic features of the method according to the invention are that between the body and the groove layer there is a filler component layer, the groove layer consisting of wafer elements having a base part and a wafer part, and a bottom 35 part having an axial wedge structure is attached to the body by a uniform filler component layer. It is also an object of the invention to provide a novel wafer element on a web forming machine for forming a groove roll groove for forming a vacuum. The wafer elements according to the invention can be assembled on top of each other during gluing. Characteristic features of the puck test element according to the invention are that the puck element comprises a base part and a wafer part, and the base part has an axial wedge structure for aligning the wafer elements with a forming base part arranged through the groove layer.

The invention further relates to a novel method of manufacturing a groove roll 15 for forming a vacuum in a web forming machine. The method of the invention enables a cost effective way of forming a groove roll. While attaching the groove layer to the frame layer, the inaccuracies of the wafer components are at the same time compensated. Characteristic features of the method of the invention are that the groove layer is secured to the frame 20 by a filler component layer, and frame.

The invention relates to a groove roll for use with a forming machine for forming a vacuum. Vacuum is formed in connection with the web supported by the groove roll. The web refers to 30 paperboard and paper webs. In contrast, a web-making machine refers to machines for making paper or board. The groove roller has a frame and a groove layer. In the groove layer, adjacent grooves may be separate single-groove grooves or may be formed by a single spiral groove. In addition, a filler component layer is provided between the base layer and the groove layer. In this case, the filler component layer at the same time unexpectedly functions as a fastening component layer. In other words, the groove pad is attached to the body by a filler component layer. The filler component layer makes it possible to simplify groove roll fabrication without having to weld single disc elements to the body surface. In addition, the filler component layer can be used to attach a wide variety of materials to the body, the material of which can be selected relatively freely with respect to the attachment. In other words, the material of both the body and the groove layer can be selected exactly as desired when their attachment to each other 10 is solved by the filler component layer. The production of the groove roll in accordance with the invention as a whole can be carried out at a much lower cost than the prior art, while at the same time obtaining a grooved roll having better characteristics.

In one embodiment, the groove roll comprises a body and a groove layer consisting of a plurality of heels and grooves in the base layer. In addition, the groove layer has an integral base portion underneath the heels and grooves of the heel layer, which is secured to the body by a uniform filler layer. That is, the filler-20 component layer has a groove layer attached over a width of more than one heel. By attaching the groove layer with the same filler layer over a distance of more than one heel, the structure is uniform. In addition, this structure is simple to fabricate.

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In another embodiment, the composite layer is cast with the groove roll in an upright position between the body and the groove layer, the groove layer being substantially centered with respect to the body. By this method, manufacturing defects already present in the frame or groove layer, typically in the casting elements of the groove forming wafer, can be simply eliminated during the step of fixing the frame and the groove layer. This will simplify the manufacturing process and make the subsequent repairs very small.

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In a third embodiment, the filler component is cured by heating. This allows the filler component, which is several millimeters thick, to be formed quickly. In other words, the thickness of said filler component is sufficient to substantially eliminate the dimensional errors in the body and 5 grooves. On the other hand, said filler component layer can be formed and cured at a sufficient rate for efficient manufacturing.

The invention will now be described in detail with reference to the accompanying drawings, in which:

Fig. 1 shows a groove roll according to the invention as seen from the end of a groove roll 15,

Figure 2 is a side view of a groove roll according to the invention,

Fig. 3a shows a partial sectional view of the side roll side according to the invention during manufacture of the side roll, 20 Fig. 3b shows a partial sectional side view of the side roll from the finished groove roll,

Fig. 4 shows a partial sectional view of the groove roll according to the invention from the side of the finished groove roll, and Fig. 5 shows a use of the groove roll according to the invention.

Fig. 1 shows a groove roll 10 according to the invention as seen from the end of a groove roll 10. The groove roll is intended to be used in a web forming machine to form a vacuum. The groove roll 30 then creates a vacuum on the portion of the web on which the web covers the groove roll. The web forming machine has a plurality of positions in which the groove roll of the invention can be used. The groove roller according to the invention can be used, for example, with a drying section as a turning roll, a support roll or a paper guide roll. Further, the groove roll of the invention can be used as a dewatering roll with a press section or a mold section. The roll can be manufactured in a very wide diameter range. In addition, the groove depth and heel width can be extensively adjusted to optimize the groove roll operation.

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The groove roll 10 according to the invention shown in Fig. 1 includes a body 12 and a groove layer 14. In the center of the body is a shaft 22 from which the groove roll is attached to the body of a forming machine. The groove layer 14 further includes a base layer 16 and a base layer 18. The base layer 16 and the base layer 18 appear as one groove layer 14 viewed from the end of the groove roll 10, but the dashed line indicates that the groove comprises longitudinal grooves and Here, the longitudinal direction 15 of the groove roll refers to the width direction of the forming machine. Further, between the body 12 and the groove layer 14, a filler component layer 20 is provided. The filler component layer allows for a variety of groove layers to be attached to the frame. Free material choices allow lighter groove rolls to be manufactured. 20 In addition, a structure that is more resistant to corrosion and wear is simultaneously achieved.

Figure 2 is a side view of a groove roll 10 according to the invention. In the middle of the career roll, a clip has not been shown. The body 25 12 consists of one continuous body member, but equally the body may consist of several body members in the longitudinal direction of the body. The metal body members can be joined, for example, by laser welding. Preferably, the body consists of a composite material such as carbon fiber. In turn, groove-30 ros 14 may consist of a coating on which grooves are machined. The filler component layer allows the groove layer 14 to be of a different material than the body 12. If the grooves 24 are directly machined to the surface of the body 12 to form the groove layer 14, the groove layer 14 and the body 12 are of the same material. However, they require very different properties. The invention makes it possible to completely cover the body 12 with, for example, rubber, into which the grooves 24 are machined to form the groove layer 14. Between the grooves 24 there are brackets 26.

In the groove roller shown in Fig. 2, the body is made of composite, preferably carbon fiber. The density of the composite selected for the frame should be less than 2100 kg / m3, preferably less than 1800 kg / m3. Correctly selected composite materials, preferably carbon fiber, provide a grooved roll with the desired properties. A key feature, for example, is vibration, which becomes significant especially at machine speeds above 2000 m / min. The wall thicknesses of the composite body are 5-30 mm, preferably 5-25 mm. On the whole, the advantage of the composite structure is its small mass, higher specific frequency and lower vibration level due to its good damping properties. The density of the composite selected for the Uraker-15 should be less than 2000 kg / m3, preferably less than 1700 kg / m3. Thanks to its light weight, the composite structure also enables useless solutions. The mass of idle groove rolls has an effect on the operation of the machine, since the idle rolls draw the energy they need to rotate from 20 wires. Particularly during acceleration, heavy idle rolls would strain the wire. In addition, composite materials are highly resistant to the conditions of the web forming machine, where the heat can be above 100 ° C and the humidity is significantly high. The web forming machine also contains process chemicals-25 and, like chlorides and lye, which the groove roll must endure. The invention enables a composite body because the brackets are not fastened, for example, by prior art welding. In addition to plastic composites, light metals are good materials due to their light weight. The roll has a diameter of 400 to 1000 mm, typically 600 to 900 mm. Up to 1500 mm in the swivel roller application. For example, the width of the forming machine, i.e. the length of the roll, may be 11 m.

Fig. 3a shows a partial section 35 of the groove roll 10 according to the invention, viewed from the side of the groove roll 10 during manufacture of the groove roll. The groove roll 10 has a frame 12 and a groove layer 14. Between the groove layer 14 of the frame 12 and 7, there is a filler component layer 20. The filler component layer has an extruded square strip and filled with irregularities between the square strip and the groove.

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Figure 3b shows a partial sectional view of the groove roll 10 of the invention from the side of the groove roll 10 with the groove roll 10 ready. The groove layer 14 of the groove roll 10 consists of wafer elements 28. The wafer members 28 which form the grooves 24 are opened by extruding a square profile. Preferably, the wafer member 28 includes a base member 30 and a wafer member 32. With the wafer member 28 comprising a bottom member 30 and a wafer member 32, the wafer member 28 is very simple to attach, since the bottom member 30 of the wafer member 28 is secured to the body 12 by a filling component 15. grooves 24 between the brackets 26. Attaching such a wafer element to the filler component is very advantageous since the grooves do not need to be supported to the correct width during manufacture by separate support means. In the prior art, for example, when welding 20, the wafer elements may be watered, making it difficult to secure. In the prior art, supporting the wafer elements during manufacture causes additional work compared to the method according to the invention.

Figure 4 shows a partial sectional view of the groove roll 10 according to the invention from the side of the groove roll 10 with the groove roll 10 ready. The groove layer 14 of the groove roll 10 consists of wafer elements 28. The wafer elements are manufactured separately by molding, for example, by compression molding and are assembled together. To the body 12, the wafer elements 30 28 are connected by a filler component layer 20 made by casting. Casting gives the filler layer a desired thickness. The filler component layer has a thickness of 2-8 mm, preferably 3-5 mm. Although the average thickness is more than 2 mm, the thickness can be even thinner. The filler-35 component layer can then significantly compensate for inaccuracies in the components forming the groove and the body.

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In other words, the filler component layer makes it possible to eliminate inaccuracies in the manufacture of the body and the groove layer by joining the body and the groove layer. More specifically, the filler component layer can smooth out the casting defects in the Kiek-5 test elements. The height of the carrier portion 16 in the groove roll, i.e. the depth of the grooves, is 15 to 112 mm, preferably 20 to 80 mm.

The groove layer 14 in the groove roller according to the invention shown in Fig. 4 is preferably made of a composite material, since the composite material provides the desired properties of the groove layer. Composite material is a generic name for a combination of two or more materials in which the materials work together but are not dissolved or fused together.

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In the groove roll 10 according to the invention shown in Fig. 4, the puck test member 28 includes a base member 30 and a wafer member 32. The bottom member 30 further includes an axial wedge structure 42 for aligning the wafer members 28. The wedge structure is necessary for fabrication because it allows for the assembly and alignment of separately manufactured wafer elements with respect to one another. Targeting is simple but still accurate. In this case, the wafer elements can be stacked on top of each other, whereby their wedge portions hit each other. The holes in the center of the wafer elements 25 overlap and the wafer elements form a long opening into which the body is inserted. Thereafter, a filler component layer is formed between the body and the wafer elements. The filler component layer is a plastic material, i.e. a polymeric material, which is preferably epoxy. Epoxy filler-30 is a particularly good material for the component layer, ie the filler, because the epoxy is fluid and easily clogs even small gaps.

The invention further relates to a wafer element on a web forming machine for forming a groove layer 35 of a groove roll used for forming a vacuum. Such a wafer element includes a bottom portion and a wafer portion, and the bottom portion includes a wedge structure for aligning the wafer elements 9. When making a groove roll for forming a vacuum in a web forming machine, the groove layer is attached to the body with a filler component layer. For the function and cost efficiency of the roll, the wafer element 5 should be manufactured so that the heel is as narrow as possible and the groove is as wide as possible. The wafer elements can be manufactured by many methods. One alternative is extrusion, as mentioned in connection with Figures 3a and 3b.

In particular, the wafer elements can be manufactured by pressing methods. The wafer elements made of fiber-reinforced material may be manufactured, for example, by transfer molding or compression molding. In transfer pressing, the raw material is heated and metered in a separate cylinder from where it is pressed into a mold cavity. In turn, in compression molding, the raw material is dispensed into an opened mold and the mold is closed, whereby the body is shaped to a mold cavity with a compression force of 5 to 25 MPa. During compression, the raw material is in a liquid state to obtain a homogeneous entity. Thus, for example, air bubbles do not appear in the wafer elements.

In hot pressing, the reinforcement and the resin are molded to their final shape in a heated mold by a hydraulic press. Preferably, the wafer element is manufactured by hot pressing from SMC or BMC-25 pulp. Thus, the wafer element has a low post-treatment requirement, high rigidity and low creep compared to other plastic products, as well as good mechanical strength and heat resistance. In addition to the above, dimensional accuracy is a key feature of the extrudates, as mold shrinkage during cure is only 0.05-0.3%. Further, the targeting and sealing design is created by the technique used.

Figure 5 illustrates the use of a groove roll 10 according to the invention with an overblown section 40. The groove roll 10 creates a vacuum in connection with the web 36 supported by the wire 34 for a portion of the distance covered by the wire 34 and web 36. Vacuum generation with the groove roller 10 according to the invention is enhanced by the flow control means 38. In this embodiment, the swivel roller 44, which may be up to 1500 mm in diameter as described above, is also a groove roll 10. The swivel roller 44 is useful to a groove roll mass level where the idle groove roll application would require a considerable amount of energy from the wire to rotate.

Claims (10)

A knurled roller to be used in a sheet forming machine for forming underpressure, wherein the knurled roller (10) has a body (12) and a knurled layer (14) characterized in that between the body (12) and the knurled layer ( 14) comprises a filler component layer (20) and the knurled layer (14) is made up of disc elements (28) which include a bottom part (30) and a disc part (32), and the bottom part (30) comprises an axial wedge structure (42). ) to align the disc elements (28) to each other, whereby the bottom portion (30) is formed for the corrugated layer, via which the disc elements (28) have been attached to the body (12) with a continuous filler component layer (20). 15 2. A grooved roller according to claim 1, which comprises a body (12) and a grooved layer (14), which consists of the tongues (26) and grooves (24) forming a layer (16) of tongues, characterized in that the knurled layer (14), beneath the layer of tongues (16), the tongues (26) and the grooves (24), there is a uniform bottom part (30), through which the layer of tongues (16) is attached with a continuous filler component layer (20). ) at the body (12). 3. A grooved roll according to claim 1 or 2, characterized in that the grooved layer (14) is of composite material. 4. A grooved roller according to any one of claims 1-3, characterized in that the body (12) is of composite. 5. A grooved roller according to any one of claims 1-4, characterized in that the body (12) is of carbon fiber. A disc element of a sheet forming machine for forming a knurled layer in a knurled roller used to create vacuum, characterized in that the disc element (28) comprises a bottom part (30) and a disc part (32), and the bottom part (30). comprises an axial wedge structure (42) for aligning the slab elements (28) to each other, wherein the for the grooved layer has been arranged to form a bottom part (30), through which the slab elements 5 (28) are arranged to be fixed by means of a continuous filling. component layer (20). A disk element according to claim 6, characterized in that the disk element (28) is of composite. 10 A method of producing a grooved roll to be used in a sheet forming machine for forming a vacuum, wherein the grooved roll (10) comprises a body (12) and a grooved layer (14), characterized in that the grooved layer 15 (14) ) is attached to the body (12) with a filler component layer (20) and the knurled layer (14) is made up of disc elements (28) which comprise a bottom part (30) and a disc part (32), and the bottom part (30) comprises an axial wedge structure. (42) whereby the disk elements (28) are directed towards each other, whereby for the knurled layer a bottom part (30) is formed, via which the disk elements (28) are attached to the body (12) with a continuous filler component layer (20). 9. A method according to claim 8, characterized in that the filler component layer (20) is cast when the grooved roller 10 is in an upright position between the body (12) and the grooved layer (14) when the grooved layer (14) is substantially centered. in relation to the body (12). A process according to claim 8 or 9, characterized in that the filling component (20) is cured by heating.