CN106544919B

CN106544919B - A cover body and spreader roller for spreader roller

Info

Publication number: CN106544919B
Application number: CN201510600532.3A
Authority: CN
Inventors: 迈克尔·沃库雷克; 马丁·布赖纳德; 托马斯·魏斯哈普; 托马斯·霍尔策; 肖冬民
Original assignee: Voith Patent GmbH
Current assignee: Voith Patent GmbH
Priority date: 2015-09-18
Filing date: 2015-09-18
Publication date: 2020-09-04
Anticipated expiration: 2035-09-18
Also published as: AT15628U1; CN106544919A

Abstract

The invention relates to a jacket body for a spreader roll of a machine for producing and/or processing a fibrous material web, comprising at least one polymer layer in which reinforcing structures are embedded, wherein the reinforcing structures consisting of a starting material are formed by winding a plurality of helical turns along a longitudinal axis of the jacket body, wherein the starting material is a thread-like formation and/or a flat formation, and to a spreader roll.

Description

A cover body and spreader roller for spreader roller

Technical Field

The invention relates to a cover for a spreader roll and to a spreader roll.

Background

Spreader rolls are used in machines for manufacturing and/or treating a fibrous material web. In the case of the intended use of such machines, for example for papermaking, the spreader roll is in contact with the paper web at least indirectly, for example in a coating machine for coating the paper web or in a windup area in which the paper web is wound up into a drum. On the other hand, the spreader roll may also be in contact with the clothing of the machine, for example the forming screen, at least indirectly in the region of the forming section. In each case, such spreader rolls are subject to high friction and hence wear during operation of the machine due to contact. In addition to the high friction, a moist environment arises in the forming section due to the fibre suspension.

Such spreader rolls have a plurality of cylindrical outer sleeves (also referred to as segments) which are arranged one behind the other on a roll core and are rotatably supported on the shaft. The outer sleeves are arranged at a distance from one another (preferably at the same distance) without touching one another. Which are supported independently of each other on the roll core. The roll core has a roll axis. The roll axis corresponds to the longitudinal axis of the roll core. The side surface of the outer cylinder periphery of each outer sleeve is sleeved with a unique connected sleeve body. As described above, the jacket body comes into contact with the sheet web when the spreader roll is used as specified. For this purpose, the paper web or the clothing is wound at least partially around the spreader roller, as seen in the circumferential direction of the spreader roller. Furthermore, spreader rolls are known which are configured banana-like, that is to say with a roll core which is curved perpendicularly to the longitudinal axis of the roll. The jacket body then essentially follows the outer contour of the roller core, i.e. is likewise curved.

Disclosure of Invention

A spreader roll in the sense of the present invention is understood to mean a spreader roll of the type mentioned at the outset for a machine for producing and/or treating a fibrous material web, comprising a roll core, having a plurality of outer sleeves arranged rotatably on the roll core and a jacket body arranged at least indirectly on the outer circumference of the outer sleeves, wherein the jacket body comprises at least one polymer layer in which reinforcing structures are embedded, wherein the reinforcing structures consisting of a starting material are formed by winding a plurality of helical turns along the longitudinal axis of the jacket body, wherein the starting material is a thread-like formation and/or a flat formation.

A fibrous material web in the sense of the present invention is understood to be a non-woven fabric (Gelege) or a fabric (Gewirre) of fibers, for example wood fibers, plastic fibers, glass fibers, carbon fibers, additives or the like. The fibrous material web can thus be configured, for example, as a paper web, a cardboard web or a tissue web. The fibrous material web comprises mainly wood fibres, wherein small amounts of other fibres or additives and addenda may be present. This is determined by one skilled in the art, depending on the use case.

A jacket body in the sense of the present invention means a band which closes itself (in the manner of a loop) in the circumferential direction about its longitudinal axis. The jacket body is open at its axial ends (viewed in the width direction along the longitudinal axis). Thus, the jacket body can be slipped onto the roll core (or a segment thereof) of the spreader roll via one of its axial ends. In this case, the inner face (radially innermost outer face) of the sleeve body then rests at least indirectly on the (radially outermost) outer face of the segment. "at least indirectly" encompasses both indirect (through other media) and direct (next to) alternatives.

The jacket body may be partially or completely made of a polymer. In this case, pourable, curable, preferably elastomeric polymers, also referred to as cast elastomers, for example polyurethanes, can be used as polymers.

By polymer layer is meant a layer comprising such a pourable, hardenable, preferably elastomeric, polymer or a layer made entirely of it. Preferably, the polymer layer may be a hardened layer integrally formed by primary forming (urformer). In other words, the polymer layer is integrally formed, i.e. for example by casting. The term "one-piece" also includes the case in which the one layer is in turn produced from a plurality of layers of the same material when the polymer is cast. However, this applies only if these coatings are essentially no longer visible after hardening, but rather a single, preferably uniform layer results. The same applies correspondingly to the finished sleeve.

In the case of a plurality of polymer layers, these are arranged one above the other, viewed in the radial direction. Preferably, exactly one, two or three polymer layers are provided as functional layers. These functional layers can be uniformly embodied in terms of their polymers. In the case of a plurality of polymer layers, the radially inner (or innermost) polymer layer (measured in the radial direction about the longitudinal axis of the jacket body) has a thickness of about 5 mm. The radially outer (or outermost) polymer layer may have a corresponding thickness of about 10mm to 20 mm. The term "about" refers to a deviation of +/-20% of the maximum value referred to.

When referring to the thickness according to the invention, this always means the (spatially smallest) value of the diameter of the outer contour in a cross section through the longitudinal axis of the starting material or its fibers. In case the outer contour is round (seen in this cross-section) the thickness is equal to the diameter of the outer contour. In the case of an outer contour which is not circular, the thickness corresponds to the diameter of the inscribed or circumscribed circle, also seen in this cross section.

The term "thread-like formation" is to be understood as a thread-like formation, for example a yarn or a strand. Yarn refers to a threadlike, long, thin formation of one or more fibers. A strand is understood to be a threadlike formation made of a plurality of yarns twisted together. The threadlike formation may be made of a plurality of fibres twisted with one another in the manner of a cord. The definitions mentioned are used here independently of the materials and thicknesses used. This means that for example relatively thick metal yarns are also referred to as yarns, and not as metal filaments as is common in the art.

In the sense of the present invention, flat (preferably woven) structures made of thread-like structures, such as woven, warp-knitted, weft-knitted or knitted fabrics (geflect), but not non-woven fabrics, as will be explained below, are suitable as flat structures. The flat formation may be a belt. The definitions mentioned here can also be used independently of the materials and thicknesses used.

The definition that the starting material is constructed continuously means that the thickness of the starting material or its fibres or yarns is significantly less than its respective total length. In other words, the quotient of length (L) and thickness (d), i.e. L/d >100, preferably >1,000, or >10,000, or >100,000. The starting material may be configured such that its thickness comprises only a fraction of the thickness of the finished polymer layer.

When referring to the width of the starting material in the present invention, what is meant is the dimensional extent in space, respectively extending perpendicularly to the direction of thickness, as long as it is present. In the case of flat formations, the thickness of the starting material is then considerably smaller than the width, which in turn is considerably smaller than its length.

The starting material is understood to be the material or semi-finished product by means of which the reinforcing structure of the glove body made according to the invention is produced. In the case of a (in particular woven) flat formation, the starting material, i.e. the blank, can be a strip, in particular a continuous strip, whose width is significantly smaller than the width of the sheath. The length is preferably dimensioned in such a way that a (single) reinforcing structure can be produced continuously, that is to say in one step, without interruption, preferably with a single winding stroke (wickerkungang), over the entire width of the sheath body. The starting material may, for example, be in the form of a (preferably tape-like) web and unwound from a roll in length. The textile flat formation serving as starting material according to the invention can be single-coated or multi-coated in itself. The width of the starting material may be, for example, between 5 and 30 cm. The starting material or its yarns may be made of a polymer. Other materials, such as steel or stainless steel, are obviously also conceivable. The starting material as a blank may preferably be free of polymer forming at least one finished polymer layer in its state prior to application to the winding spindle (i.e. in the unwound state). This means that the starting material is only in contact with the polymer when or shortly before it is applied to the winding spindle according to the method according to the invention.

In the context of the present invention, a jacket body produced is a jacket body in which at least one polymer layer is hardened and is finally processed, that is to say ready for the purposes mentioned at the outset, for example for being wound onto a spreader roll or for the production of paper. Similarly, the resulting polymer layer refers to the hardened layer.

The term "reinforcing structure" in the sense of the present invention refers to at least one reinforcement comprising a polymer or a layer consisting of this polymer, i.e. a polymer layer. The reinforcing structure can be completely embedded in the polymer layer, so that the reinforcing structure does not protrude beyond the boundary of the polymer layer. In other words, the polymer layer assumes the role of a matrix surrounding the reinforcing structure and bonding it to the matrix due to adhesion or cohesion.

The term "single reinforcing structure" means that the thread-like formation and/or the flat formation is the single reinforcement (of at least one polymer layer, all polymer layers and preferably the entire finished envelope itself). This means that exactly one reinforcing structure is provided which is composed of a thread-like formation, a flat formation or a combination of both, and in addition to this, no other reinforcing structure is provided within the meaning of the invention. In other words, at least one polymer layer, all polymer layers and preferably the entire envelope are free of further (additional) reinforcing structures, such as thread-like formations and/or flat formations, and preferably free of buckling-free fabrics.

Here, a non-crimp fabric is understood to be a flat formation made up of one or more layers of parallel running yarns which are not fixed at their crossing points by a material bond (stoffschlussig), a friction bond (reibshussig) or a form bond (formschlussig). This non-buckling fabric is not load-bearing in itself after laying, that is, it loses the shape given to it when displaced. If the non-crimp fabric is to retain its shape, it is necessary to forcibly hold the yarns one above the other, for example embedded in a polymer layer.

The only reinforcing structure can also be present when a multi-coated, for example woven, flat former wound to form a reinforcing structure according to the invention is used as starting material. In this case, the plurality of cladding layers always follows one and the same spiral turn. The spiral turns themselves are then multi-coated in each case, viewed in the direction of winding. This arrangement can be achieved in that a plurality of layers of the starting material are laid one on top of the other without connection during the production of the covering or are connected to one another by stitching, gluing, weaving or laminating. Alternatively or in place, a plurality of winding strokes may also be provided. The winding stroke is understood to be the step of applying all the helical turns made of starting material in a single step, without interruption, over the entire axial length of the jacket body, that is to say from one axial end to the other axial end. In the case of a plurality of winding strokes, therefore, a plurality of spiral turns lying one above the other in the radial direction is obtained, which now run concentrically with respect to one another. However, the definition of "sole reinforcing structure" does not include fillers or particles, such as single or short fibers or impurities, which are embedded in the polymer layer and also cause reinforcement. That is, they may be completely contained in the polymer layer, whereas they are not considered (unique) reinforcing structures in the sense of the present invention.

The winding direction is understood to be the direction in which the helical turns are applied, i.e. the direction in which the starting material from which the finished jacket is wound around the longitudinal axis of the winding spindle or around the longitudinal axis of the finished jacket. During the production of the sleeve, the starting material can be unwound in length from a coil and applied stepwise in the direction of the longitudinal axis of the winding spindles to at least one winding spindle on which the sleeve is produced. That is to say that the helical turns thus obtained (at least those successive helical turns of one and the same winding run, that is to say the immediately adjacent helical turns) are mathematically a continuous, uninterrupted curve. Preferably, the curve is wound with a constant pitch around the envelope of an imaginary cylinder concentric with the finished envelope, that is to say whose radially outermost surface or its longitudinal axis extends over the entire width of the finished envelope (and therefore from one axial end thereof to the other axial end thereof). In this case, the winding path or all the spiral turns of the entire reinforcing structure have the same winding direction, i.e. only left-hand or only right-hand. However, in the case of a plurality of winding strokes, the winding direction from winding stroke to winding stroke may be varied. The pitch of the thread can generally be selected in such a way that the starting material unwound in length overlaps in the width direction, i.e. on the width edges thereof. The pitch corresponds to the distance between identical or common width edges of successive spiral turns, i.e. of the immediately adjacent spiral turns as seen in the winding direction, so that in each case, for example, the width edges which are always to the left as seen in the winding direction are spaced apart from one another. The pitch therefore corresponds to the so-called winding feed (wickelectroschub), i.e. the speed of movement of the pouring nozzle relative to the winding spindle along its longitudinal axis during its rotation, measured for example in millimeters per revolution. Here, the smaller the pitch, the greater the tensile strength of the entire jacket body (viewed in its circumferential or width direction), but the thicker the jacket body in the radial direction.

The overlapping width edges lying loosely against one another mean that (at least during winding or in the finished sleeve) the width edges, apart from the polymer layer in which they are embedded, have no force-locking, cohesive and/or form-locking connection with one another. This also applies to helical turns made in different winding strokes, adjacent to each other. This means that the helical turns are not otherwise connected to one another when placed onto the winding spindle and into the still unhardened polymer. It is clear that the starting materials, i.e. the fibers of the blank required for producing the sleeve, can be connected to one another in a force-fitting, material-fitting and/or form-fitting manner.

A woven flat formation woven from warp and weft yarns is understood to be a woven fabric or a woven tape. Here, the warp and weft yarns cross each other. In this case, the woven fabric can comprise a single or a plurality of different, preferably a plurality of yarn systems which differ in their mechanical properties. It is also conceivable, however, to use a shuttle fabric in which the warp and weft threads are produced from the same material.

The term "knitted fabric" is to be understood as meaning a textile flat structure in which one loop formed by means of a yarn is wound into the other loop. That is, the knitted fabric may be a weft or warp knitted fabric. Weft-knitted fabrics can be obtained, for example, by knitting or crocheting, in which each mesh row is formed from a single yarn for each mesh. Weft-knitted fabrics are composed of one or more yarn systems. In this case, a loop projects into the loop of the preceding row of cells. In warp knitting, however, at least two yarn systems are used and a mesh of one mesh row is formed at the same time. The yarn system may have different mechanical properties, such as different mechanical strength, modulus of elasticity or elongation at break. Alternatively, however, the yarns of the different yarn systems can also be made in a uniform manner, i.e. from the same material. In the sense of the present invention, however, the term "knitted fabric" or "warp knitted fabric" is to be understood in particular as a warp knitted web, but also as an article made up of a plurality of longitudinal threads running parallel to one another, onto which the transverse threads are laid in a meandering manner in a non-crimp fabric, and at the crossing points of the longitudinal threads and the transverse threads the two are joined to one another in a force-fitting, material-fitting and/or form-fitting manner. This engagement may also be achieved by the yarn itself. Such articles have an independent load-bearing capacity in their own right, i.e. the predefined shape does not disintegrate due to moderate external effects.

The starting materials or the fibers thereof may be selected in such a way that they have a density of 170,000N/mm²To 250,000N/mm²Preferably 180,000N/mm²To 210,000N/mm²The modulus of elasticity of (a).

"substantially in the longitudinal direction or in the width direction" is to be understood as meaning that deviations of even 45 ° on both sides with respect to the respective direction are possible.

The invention also relates to a reinforcing structure for embedding in at least one polymer layer of a glove body. Here, the reinforcing structure made of the starting material is formed by a plurality of helical turns along the longitudinal axis of the jacket body. The starting material is a wire-like formation and/or a flat formation according to the invention.

The invention also relates to a machine or a component thereof mentioned at the beginning, such as a winding device, a former or a coater, in which the component according to the invention, i.e. the jacket and/or the spreader roll, is built.

Drawings

The invention is explained in detail below, without limiting the generality, with reference to the accompanying drawings, in which:

fig. 1 shows a very schematic partly cut-away view of a spreader roll according to the invention;

figure 2 shows a very schematic view of an apparatus for manufacturing a glove body according to the invention;

FIG. 3 shows a schematic partial and enlarged partial view of an embodiment of a starting material for a reinforcing structure of a glove body according to the invention in a cross section through the longitudinal axis of the glove body;

FIG. 4a shows a schematic, partial and enlarged partial view of an embodiment of a starting material for a reinforcing structure of a jacket body according to the invention in a cross-section through the longitudinal axis of the jacket body;

fig. 4b and 4c show schematic views of two embodiments of the starting material in a top view.

Detailed Description

A very schematic partly cut-away view of a spreader roll 7 according to the invention is shown in fig. 1. The illustration is not to scale. The spreader roll 7 has a curved roll core 7.2. The curvature is shown in an exaggerated manner. In the present invention, the roll core 7.2 follows the curvature of its roll axis 7.1. The roller axis 7.1 is concentric with the roller core 7.2 and is curved in the selected view about a perpendicular to the plane of the drawing. The spreader roll 7 can be embodied such that it is bendable, i.e. can be changed between a bent position and a non-bent position in the case of intended use.

A plurality of cylindrical outer sleeves 7.3 are arranged on the roller core 7.2. The outer sleeves 7.3 are preferably arranged spaced apart from one another without touching one another. They can preferably be arranged uniformly distributed over the roller core 7.2. The term "uniformly distributed arrangement" relates to the minimum spacing of the points of symmetry (the intersection of the respective axes of symmetry with the roller axis 7.1) of the outer sleeves 7.3 which are respectively directly adjacent to one another. In the shown bending position of the spreader roll 7, the axes of symmetry of the outer sleeves 7.3 intersect at a common point of intersection in extension. This point of intersection corresponds substantially to the middle point of a full circle which coincides with the curved roll axis 7.1 or is drawn therewith.

The outer sleeves 7.3 can be mounted on the roller core 7.2 independently of one another in a rotatable manner about a longitudinal axis of the roller core 7.2, which can coincide in sections (for example tangentially) with the roller axis 7.1. The rotatably mounting means that a rotational movement of the outer sleeve 7.3 relative to the roll core 7.2 can be achieved, in particular if the spreader roll 7 is used as intended. Preferably, the outer sleeve 7.3 is constructed in such a way that it cannot move in the axial direction, i.e. in the direction of the roller axis 7.1, at least in the case of a defined use of the spreader roller 7.

In the present illustration, five outer sleeves 7.3 are shown by way of example. Of course, a different number is also conceivable.

Bearing means are provided at the axial ends of the roll core 7.2 in order to absorb the forces acting on the spreader roll 7 during its operation. The support means may be a fixed support means or a rotary support means. The spreader roll 7 and in particular the roll core 7.2 may be rotationally driven, that is to say may be constructed cyclically with respect to a stationary part, such as a machine base in which the spreader roll is mounted, or may be constructed rigidly, that is to say not cyclically with respect to this stationary part.

The only consecutive sleeve body 1 is fitted on the radially outer circumferential side of each outer sleeve 7.3. The jacket body extends at least from (or beyond) the axial end of the first outer sleeve 7.3 up to and beyond the axial end of the last outer sleeve 7.3 opposite the first one. Such a sheath 1 is shown in the following figures.

Figure 2 shows a very schematic side view, partly in cross-section, of an apparatus for manufacturing the glove body 1. In the present invention, the device has exactly one cylindrical winding spindle 4 which is passed through and on which the starting material 3.1 is applied by winding. The initial stages of the manufacturing method are shown in the figures. In the present case, one end of the starting material 3.1 is fixed to the polymer layer 2, which is arranged on the outer circumference of the winding spindle 4. The polymer layer 2 is part of the covering 1 to be produced. The starting material 3.1 then acts as a reinforcing structure for the polymer layer 2 to be produced.

The starting material 3.1 can be a flat formation whose width (the width direction of the starting material 3.1 extending into the drawing plane substantially perpendicularly thereto in the drawing) is smaller than the width of the jacket body to be produced. The starting material 3.1 can be present, for example, as a web.

The winding spindle 4 is mounted so as to be rotatable about its longitudinal axis 1.1, which corresponds to the longitudinal axis of the jacket body to be produced. The longitudinal axis 1.1 extends perpendicular to the drawing plane. A casting compound, for example a castable, curable polymer (for example polyurethane) is applied from above onto the winding spindle 4 via a line 5 via a casting nozzle 6. This casting compound can be selected, for example, with regard to its pot life and viscosity, in such a way that it completely saturates the wound coating on the starting material 3.1, which is arranged one above the other in the radial direction, during casting, without dripping from the winding spindle 4 itself.

The starting material 3.1 is unwound from a reel, not shown, and is wound in helical turns on the winding spindle 4, more precisely on the polymer layer 2 already on the winding spindle 4. As it is wound, the starting material 3.1 is embedded in the polymer layer 2 to be produced. The starting material acts as a reinforcing structure for the polymer layer 2.

The width of the pouring nozzle 6 corresponds approximately to the width of the starting material 3.1. However, the width of the pouring nozzle 6 can also be dimensioned larger. However, the width of the pouring nozzle 6 is smaller than the width of the jacket body 1 to be produced.

In principle, during the winding of the starting material 3.1, the winding spindle 4 is rotated about its longitudinal axis in the direction of the arrow. Simultaneously with this rotation, the pouring nozzle 6 is guided along the longitudinal axis 1.1 parallel thereto, relative to the winding spindle 4, via suitable guides not further shown in fig. 2. Simultaneously with the winding, additional polymer can then be applied to the starting material 3.1 which has just been wound onto the polymer layer 2 by means of the pouring nozzle 6. Alternatively, the starting material 3.1 can first be completely wound over the entire width of the sheath body and subsequently the polymer is applied thereto. The polymer layer 2 is hardened to form a single, integral or coherent polymer layer. However, it is also possible to provide a multilayered jacket body which comprises a radially inner polymer layer and a radially outer polymer layer, respectively. The polymer layers can be selected in such a way that they differ in their mechanical and/or chemical properties.

The casting compound can be passed through the starting material 3.1 to the winding spindle 4 independently of this. In this example, the polymer forms the entire polymer layer of the jacket body right after hardening, only a part of which is shown in fig. 2.

In principle, the winding process starts at one axial end of the winding spindle 4, which may simultaneously (except for the scrap) form one axial end of the jacket body, and ends at the opposite axial end of the same winding spindle, which then (also except for the scrap) may form the second axial end of the jacket body. Depending on the length of the winding spindle 4 selected, more than one sleeve, preferably two sleeves, can be produced simultaneously.

If a flat formation is used as starting material 3.1, overlapping can be achieved. This is done according to the selection of the width of the starting material 3.1 and the winding feed (i.e. the speed of travel of the pouring nozzle 6 along the longitudinal axis of the winding spindle 4 and the speed of rotation of the winding spindle 4 about its longitudinal axis 1.1). Due to the superposition of the rotational movement of the winding spindle 4 and the axial movement of the pouring nozzle 6, a reinforcing structure is now obtained from the starting material 3.1 wound in helical turns on the winding spindle 4, which reinforcing structure is embedded in the polymer layer 2 by pouring the pouring material (see in particular fig. 4 a).

That is to say, by means of this continuous casting process, a continuous sleeve-like jacket body 1 closed on itself about its longitudinal axis 1.1 is produced in steps over the width of the winding spindle 4, the inner circumference of which substantially corresponds to the outer circumference of the winding spindle 4.

Fig. 3 shows a first embodiment of the invention in a cross-section, not to scale, shown through a part of the longitudinal axis 1.1 of the finished jacket body 1. The starting material 3.1 is embodied as a wire-like formation, for example a metallic strand, or in the form of a rope. Here, the wound helical turns of the thread-like formation are illustrated in a simplified manner as shaded circles. The helical turns adjacent to each other are equally spaced from each other, i.e. spaced by the pitch S, over the entire length of the sheath body 1. The pitch S will be defined in more detail below.

Fig. 4a shows a further embodiment of the invention in a cross-section, not to scale, shown through a part of the longitudinal axis 1.1 of the finished jacket body 1. The spacing of the longitudinal axis 1.1 from the polymer layer 2 is likewise not to scale, as is also shown in fig. 3. The width B of the starting material 3.1 extends in the plane of the drawing. The figure shows that the width B is only a small part of the whole manufactured glove body 1. The common surface of the overlap, i.e. the overlap of two successive turns (i.e. for example a distinct "touching") can also be described by the pitch S of the successive turns. The pitch S refers to the distance (as seen in the width direction of the starting material) of the same width edge 3.1.1, 3.1.2 or of a common width edge of the successively following spiral turns of the starting material 3.1. The overlap (seen in the sectional view shown) corresponds approximately to the width B of the starting material minus the pitch S.

In fig. 4a, the tight winding is selected so that the pitch S is only a small portion of the width B of the starting material 3.1 used. A relatively thick reinforcing structure of the jacket body 1 with a high tensile strength seen in the radial direction can thus be achieved with only one winding stroke. Here, more than two, here five, successively following helical turns of the starting material 3.1 of the finished reinforcing structure overlap, seen in a cross section perpendicular to the longitudinal axis 1.1 (not shown, but indicated by the tangent a-a). But a different number than this is also conceivable.

In fig. 4a it can also be seen that, viewed in the cross-section shown through the longitudinal axis of the jacket body 1, successively following overlapping helical turns of the starting material 3.1 (viewed as an extension in the width direction of the starting material) extend at an angle to the longitudinal axis of the finished jacket body 1.

A smaller thickness of the reinforcing structure as seen in the radial direction can be achieved by increasing the pitch of the helical turns of the starting material 3.1 on the winding spindle 4. At the same time, the tensile strength of the reinforcing structure decreases with increasing pitch. In fig. 4a, the pitch S is selected in such a way that successive helical turns of the starting material 3.1 overlap from approximately one third. Other values are also conceivable, depending on the use.

In principle, the reinforcing structure can be a wire-like formation as shown in fig. 3 and/or a flat formation as shown in fig. 4a to 4c as starting material 3.1. A particularly preferred embodiment is shown in fig. 4b and 4c, which comprises a knitted or woven fabric. Irrespective of the embodiment shown, the reference to "and/or" relationship means that not only linear formations but also flat formations may be present in the same polymer layer. Alternatively or additionally, in the case of a sheath provided with a plurality of layers of polymer which are arranged one above the other, viewed in the radial direction, one of the layers may comprise only linear formations and the other layers comprise only flat formations. Layers without such reinforcing structures may also be provided. Combinations thereof are also conceivable.

Fig. 4b shows a top view of a section of the starting material 3.1 according to the invention. In the shown illustration, the vertical direction corresponds to the longitudinal direction of the starting material 3.1, while the horizontal direction corresponds to its width direction. The starting material 3.1 comprises a plurality of longitudinal yarns 3.2 extending parallel to each other in the longitudinal direction. In the manner of a non-crimp fabric, preferably exactly one single crosswise yarn 3.3 is laid zigzag over the lengthwise yarns. At the crossing points of the machine direction yarns 3.2 and the cross direction yarns 3.3, they are joined to one another in a force-fitting, material-fitting and/or form-fitting manner, which is indicated here by the dots.

In fig. 4c, the starting material 3.1 is shown in a partial plan view, configured as a woven fabric. In the shown illustration, the horizontal direction corresponds to the width direction of the starting material 3.1, while the vertical direction corresponds to its longitudinal direction. The weft yarns 3.8 of the woven fabric extend in the width direction, while the warp yarns 3.7 thereof extend in the longitudinal direction. The warp and weft yarns 3.7, 3.8 cross each other and are connected to each other by yarn crossings.

As can be seen from a comparison of fig. 1 with the remaining figures, the longitudinal axis of the finished jacket body 1 does not correspond, firstly, to the illustrated curved roller axis 7.1 of the spreader roller 7. However, since the jacket body 1 is elastic, it follows the curvature of the roll axis 7.1 of the spreader roll 7 after being applied to the roll core 7.2.

Thus, independently of the embodiment shown, different thread spacings can be achieved according to the invention by setting different thread pitches S (i.e. by overlapping successive winding loops), at least when using woven or knitted fabrics as starting material 3.1 for the reinforcement structure.

List of reference numerals

1 cover body

1.1 longitudinal axis

2 Polymer layer

3.1 starting Material

3.1.1, 3.1.2 Width edges

3.2 lengthwise yarn

3.3 Cross-machine direction yarns

3.7 warp yarns

3.8 weft yarns

4 winding spindle

5 line

6 pouring nozzle

7 stretching roller

7.1 roll axes

7.2 roll core

7.3 outer sleeve

S pitch

Claims

1. A jacket body (1) for a spreader roll of a machine for producing and/or treating a fibrous material web, comprising at least one polymer layer (2) in which reinforcing structures are embedded, wherein a reinforcing structure consisting of a starting material (3.1) is formed by winding a plurality of helical turns along a longitudinal axis of the jacket body (1), wherein the starting material (3.1) is a thread-like formation or a thread-like formation and a flat formation, wherein the thread-like formation comprises metal or is made of metal, wherein the reinforcing structure is the only reinforcing structure, and wherein the starting material (3.1) has a thickness of between 20,000N/mm²To 180,000N/mm²An elastic modulus in the range of (a).

2. Covering (1) according to claim 1, characterised in that said starting material (3.1) is constituted continuously.

3. Covering (1) according to claim 1 or 2, characterised in that said starting material (3.1) is a thread-like formation.

4. A glove body (1) according to claim 3, wherein the starting material (3.1) is a yarn or a strand.

5. Covering (1) according to claim 3, characterised in that said thread-like formation has a thickness of 0.3 to 1.5 mm.

6. Covering (1) according to claim 1 or 2, characterized in that said threadlike formation comprises or is made of steel.

7. Covering (1) according to claim 6, characterized in that said threadlike formation is made of a plurality of fibres twisted one to the other in a rope-like manner.

8. Covering (1) according to claim 1 or 2, characterised in that said starting material (3.1) is a woven flat formation having a width smaller than the width of the finished covering (1).

9. Glove body (1) according to claim 8, characterized in that said starting material (3.1) is a woven or knitted tape.

10. Covering (1) according to claim 8, characterized in that said starting material (3.1) is a weft or warp knit.

11. Glove body (1) according to claim 8, characterized in that said starting material (3.1) is a warp-knitted mesh.

12. Glove body (1) according to claim 8, characterized in that said starting material (3.1) has a width comprised between 50mm and 300 mm.

13. Glove body (1) according to claim 8, characterized in that said starting material (3.1) has a thickness of between 0.2mm and 1.0 mm.

14. Glove body (1) according to claim 8, characterized in that the same width edges (3.1.1, 3.1.2) of successive helical turns overlap, seen in the winding direction.

15. Covering (1) according to claim 14, characterised in that the overlapping width edges (3.1.1, 3.1.2) lie loosely against each other.

16. Covering (1) according to claim 1 or 2, characterized in that said at least one polymer layer (2) is produced in one piece by primary forming.

17. Glove body (1) according to claim 16, wherein said reinforcing structure is completely embedded in said at least one polymeric layer (2).

18. Glove (1) according to claim 1 or 2, wherein said at least one polymeric layer (2) comprises a polyurethane made of a prepolymer and a cross-linker.

19. A glove body (1) according to claim 18, wherein the polyurethane is formed as a cast elastomer.

20. Covering (1) according to claim 19, characterized in that the polymeric layer (2) is made with a Shore a hardness of 20 to 95.

21. Covering (1) according to claim 19, characterized in that the polymeric layer (2) is made with a Shore a hardness of 50 to 90.

22. Glove body (1) according to claim 1 or 2, characterized in that said reinforcing structure is the only reinforcing structure of said at least one polymer layer (2), of all polymer layers (2) or of the entire glove body (1).

23. Glove body (1) according to claim 1 or 2, wherein said filiform formation comprises or is made of stainless steel.

24. A roller for a machine for manufacturing and/or treating a web of fibrous material, comprising a roller core (7.2) with a plurality of outer sleeves (7.3) rotatably arranged on the roller core (7.2) and a jacket body (1) arranged at least indirectly on the outer circumference of the outer sleeves (7.3), characterized in that the jacket body (1) is embodied according to any one of claims 1 to 23.

25. A roll according to claim 24, characterized in that the roll is a spreader roll (7).

26. A roll according to claim 24 or 25, characterized in that the roll core (7.2) is curved or embodied in a bendable manner with respect to a roll axis (7.1) extending concentrically therewith.