Conveyor belt for laminating system, manufacturing process for a conveyor belt and laminating system

Abstract

Conveyor belt (11, 12) for a laminating machine (100), containing: a first band (7) which is provided with a sliding layer on at least one outer side, and a second band (9) which has steel, wherein the first belt (7) and the second belt (9) are fully connected to each other by the connecting means (8), so that the sliding layer is arranged on an outside of the conveyor belt (11, 12), and wherein in the state of the conveyor belt (11, 12) inserted into the laminating machine the first belt (7) is adapted so that it is in contact with heating and cooling elements and rollers of the laminating machine (100), and the second belt (9) is adapted so that it is in contact with a laminating material during a laminating process.

Description

Field of invention

[0001] The present invention relates to a conveyor belt for a laminating machine, a method for manufacturing a conveyor belt for a laminating machine and a laminating machine. State of the art

[0002] Laminating machines are used to bond web-shaped, flat materials or cut pieces of such web-shaped, flat materials (the material to be laminated) to a workpiece. For this purpose, both the flat materials and the workpiece are fed into the laminating machine via a transport device, bonded together by applying pressure and selectively heating and cooling at least the flat materials using heating or cooling elements, and usually transported out of the laminating machine in a continuous process. A laminating machine is known, for example, from DE 10 2011119 192 A1. Conveyor belts in general are known from EP 1 164 094 A1, US 7 323 666 B2, and DE 16 35 467 A.

[0003] Laminating machines typically have an upper and a lower conveyor belt for transporting flat materials and the workpiece. These conveyor belts are usually made of textiles, such as fiberglass, coated with polytetrafluoroethylene (PTFE). On the outside, the PTFE coating acts as a non-stick coating for the material being laminated. On the inside of the belts, the PTFE coating reduces friction, allowing the belts to move even under higher pressure. However, textile belts often produce visually unsatisfactory lamination results. This is primarily because textile belts have a textured surface and at least one seam, which can be visible on the material being laminated.

[0004] Alternatively, especially when higher pressures and / or temperatures are required, steel belts are used as conveyor belts for laminating machines. However, laminating machines that use steel belts are very expensive. This is mainly because the sliding friction between the steel belt and the heating or cooling elements must be reduced in a complex manner, for example, by means of rollers, sliding shoes, or hydraulic or pneumatic pressure zones. Description of the invention

[0005] It is therefore an object of the present invention to provide a conveyor belt which is improved compared to conveyor belts known from the prior art.

[0006] The problem is solved by a conveyor belt for a laminating machine with the features of claim 1, a method for manufacturing a conveyor belt for a laminating machine with the features of claim 12, and a laminating machine with the features of claim 15. Preferred embodiments are specified in the dependent claims.

[0007] The invention is based on the idea of ​​creating a conveyor belt for a laminating machine, preferably a circulating conveyor belt, one side of which is designed to reduce static friction between the conveyor belt and the heating or cooling elements of the laminating machine, and the other side, which receives the material to be laminated, has a smooth surface. For this purpose, the conveyor belt according to the invention consists of two belts, a first belt and a second belt, which are connected to each other. Each of the first and second belts has a longitudinal extent, a transverse extent perpendicular to the longitudinal extent, and a thickness that is again perpendicular to both the longitudinal and transverse extents. The longitudinal extent of each belt is greater than its transverse extent, and the transverse extent of each belt is greater than its thickness, so that the conveyor belt as a whole has a belt-like shape.The longitudinal extent corresponds to the direction in which the belt transports and, if applicable, rotates the material to be laminated; that is, in which the belt is usually endless. The two surfaces of the belt or conveyor belt formed by its longitudinal and transverse extents are subsequently referred to as its outer surfaces. When the conveyor belt is installed in a laminating machine, these outer surfaces can also be described as a top and a bottom, depending on their orientation.

[0008] The materials of the first and second belts are selected to possess the properties required for their intended use. In a laminating machine, the first belt is the one in contact with the heating and cooling elements and the rollers of the machine. The second belt, on the other hand, is the one in contact with the material being laminated during the laminating process. Accordingly, the first belt has a sliding layer on at least one outer surface, or at least along its entire thickness, designed to reduce static friction between the conveyor belt and the heating and cooling elements. The second belt, however, contains steel, and at least one outer surface of the second belt is manufactured to have a smooth surface. A smooth surface is characterized by the absence of any visually and / or haptically perceptible bumps or depressions.By using two different materials for the first and second belts to form the conveyor belt, namely, for example, a textile belt on the one hand and a steel belt on the other, the properties of the conveyor belt as a whole can be optimized and adapted to the requirements in a laminating plant.

[0009] To further improve the adhesion of the two belts to each other, they are preferably joined together over their entire surface by a connecting element. The connecting element is located between the first and second belts and joins them together over their entire surface in such a way that the sliding layer of the first belt is located on one outer surface of the conveyor belt and the smooth surface of the second belt is located on the other outer surface of the conveyor belt.

[0010] A full-surface bond means that the first and second bands are joined across their entire surface. When using a bonding agent, it is preferably applied to the entire outer surface of one or both bands to be joined. However, for a full-surface bond, it is also sufficient to apply the bonding agent selectively to certain points on the respective outer surfaces of the bands. Because the outer surfaces of the two bands are brought into contact and pressed together during the joining process, the bonding agent is distributed between the bands and can thus also create a full-surface bond.

[0011] The sliding layer is preferably a coating in the form of a separate layer or film applied to an outer surface of the first strip. Alternatively, the sliding layer can also be formed by encasing fibers in at least one outer region of the first strip in its thickness direction, or by introducing particles that enhance the sliding properties of the first strip material into at least this region. Alternatively, the material on at least one outer surface of the strip can also be modified by a surface treatment to promote its sliding properties.In general, a sliding layer can therefore be understood as – in addition to the application of a separate coating in the form of a layer, a film, or similar – also as a modification of at least an outer area on at least one of the outer surfaces of the first strip, such that this outer area has improved sliding properties compared to the rest of the material of the first strip.

[0012] Polytetrafluoroethylene (PTFE) is the preferred material for a sliding layer. The PTFE can either be applied as a separate coating layer to the first belt, or it can be incorporated into at least one outer region of the first belt in its thickness direction, for example, by coating fibers or elements of the first belt or by introducing PTFE particles into the first belt. PTFE has good sliding properties and can therefore significantly reduce the frictional resistance between the conveyor belt and the heating or cooling plates (heating or cooling elements) in a laminating system.

[0013] Alternatively or additionally to PTFE, the sliding layer can contain graphite. Graphite also exhibits excellent sliding and lubricating properties and is therefore also suitable for reducing the frictional resistance between the conveyor belt and the heating and cooling elements.

[0014] In a preferred embodiment, the first tape is a textile tape, more preferably a PTFE-coated textile tape. The textile tape consists of natural and / or synthetic fibers that have closely packed and intertwined, long molecular chains as structural elements, forming textile surfaces and structures. Textile surfaces and structures are two- or three-dimensional textile products manufactured from textile fibers using various techniques.

[0015] One technique for forming textile surfaces and structures, which is preferred in this case, is the weaving of textile fibers. The textile tape therefore preferably comprises a woven fabric. Alternatively, depending on the required properties of the first tape, it can also be a nonwoven, a felt, a laid fabric, a knitted fabric, or a braid.

[0016] Textile tapes can be made from numerous materials. In this case, glass fibers are preferred for the first type of tape due to their exceptional mechanical strength and durability. PTFE-coated glass fiber tapes also offer the advantage of being available in a wide range of dimensions, such as thicknesses from 0.13 mm to 2 mm, transverse widths of up to 3000 mm, and lengths of up to several hundred meters. Other materials are also conceivable for textile tapes, such as carbon fiber, aramid, or basalt.

[0017] Preferably, the first and second belts are designed as continuous belts. Continuous belts have no beginning and no end, thus forming a self-contained unit. This avoids weak points, such as joints and seams, where the belt lacks the required strength and is therefore easily damaged, for example, by tearing, and which may sometimes be visible on the laminated material when the conveyor belt is in use. However, it is also conceivable to design at least the first belt not as a continuous belt, but as individual sections arranged on the second belt, which itself is designed as a continuous belt, and then joined to it. In this case, for smooth and reliable movement of the first belt, it is important that the first belt is cut so that its ends meet almost seamlessly and smoothly.Otherwise, contact with the rollers of the laminating machine could potentially lead to uneven belt movements.

[0018] A seamless and smooth joint between the ends of the first strip, in the case of a non-continuous first strip, can be achieved by initially overlapping the ends of the first strip when it is positioned on the second strip. The first and second strips are then joined together, except for the overlap area, for example by gluing or welding. The overlap is then cut through both layers, and the overlap area is also welded. The resulting seam is virtually seamless.

[0019] An adhesive is preferred as the bonding agent between the tapes. Adhesives exhibit good bonding strength and, for example, when a thermoplastic is used as the adhesive, can even be separated from the first and second tapes at a later time. This makes it possible, for example, to selectively replace only one of the tapes in case of wear, while the other tape remains intact.

[0020] A method according to the invention for manufacturing a conveyor belt for a laminating machine comprises the following steps: First, a strip with a sliding layer on at least one outer surface and a second strip made of steel are provided. Then, the first and second strips are arranged such that the sliding layer of the first strip is on one outer surface of the arrangement. Finally, the first and / or second strip is heated, and both strips are subjected to high pressure, e.g., pressed together, so that the first and second strips fuse together.

[0021] In the present manufacturing process, the first and second strips are joined together solely by means of pressure and heat. Very high pressures and high temperatures, such as around 400°C, have proven particularly advantageous for reliably anchoring the first and second strips. This type of bonding can also be described as a sintering process.

[0022] The heating of at least one of the two belts and the application of pressure to both belts of the conveyor belt preferably takes place in the laminating machine where it will later be used. For example, one or more of the (laminating) heating elements present in the laminating machine are used to heat the belts. Advantageously, only some of the heating elements are designed to join the first and second belts. These heating elements can withstand higher temperatures and pressures than the other heating elements. However, it is also conceivable to provide one or more special joining elements, such as welding and adhesive elements, in the laminating machine, which are not used in a laminating process and thus serve only to join the first and second belts.

[0023] The heating elements for joining the first and second strips, or the special connecting elements, are preferably made of steel, while the heating elements for the laminating process are made of aluminum. While aluminum heating elements are only suitable for temperatures up to 250°C, steel welding or bonding elements can be heated up to 400°C and can therefore withstand the temperatures required for joining the first and second strips. Steel welding or bonding elements also offer the advantage of withstanding higher pressures. For temperature control, it is advantageous for the heating elements for joining the first and second strips, or for the special connecting elements, to have a separate temperature sensor, distinct from the temperature sensors of the heating elements themselves.

[0024] Furthermore, heating elements are typically spring-mounted (between the heating element and the register of a laminating machine) and are therefore only conditionally suitable for applying high pressures. Accordingly, in the heating elements used to join the first and second strips, or in the special connecting elements, pressure generators are used instead of springs between the heating element / welding or adhesive element and the register, thus significantly reducing the spring action of the heating elements / welding or adhesive elements. If the heating elements are used both for heating the material to be laminated and for welding two strips together to form a conveyor belt, their design can be modified according to their function. Depending on the application, either springs or pressure generators are inserted between the respective heating element, which is subsequently used to heat the first and second strips, and the register. Leaf springs, for example, are suitable as springs.Examples of pressure generators include buffer plates, eccentrics, hydraulic devices, etc.

[0025] By adjusting the height of the upper tower, the belts can be brought into contact and the pressure required to connect the two belts can be applied to both belts.

[0026] It has been shown that reducing the temperature after each welding operation is advantageous for a reliable connection between the two strips. This can be achieved by staggered welding of the two strips, possibly supported by opening the laminating unit or the welding device with small feeds. For example, the two strips can be welded for 60 seconds while stationary. The laminating unit or device is then opened for a specific period. Afterward, the strip is advanced, for example by approximately 100 mm, and the laminating unit or device is closed again for the next welding operation. Alternatively or additionally to opening the laminating unit, the heating elements / connecting elements can be equipped with integrated cooling, such as special cooling bores, to lower the welding temperature more quickly.As an alternative to a timed joining process, a continuous joining (welding) operation can be carried out, preferably using the joining elements that have the special cooling holes. A continuous joining process means that the strips circulate at a low speed and the pressure in the joining zone is selected so that the strips are not clamped excessively.

[0027] To improve the bond / adhesion between the first and second tapes, a bonding agent can be applied to the outer surface of the first and / or second tapes, which are aligned in a joined state. In this joined state, the bonding agent is located between the tapes. Depending on the choice of bonding agent, it can either adhere to the first and second tapes or blend with the material of both. Combinations of adhesive and blended bonding are also possible. For example, the bonding agent can be designed to blend with the material of the first tape and adhere to the material of the second tape, or vice versa. It is also conceivable to use a bonding agent that can create a bond between the first and second tapes without heating, e.g.,only by applying pressure to the first and second bands and subsequently allowing the bonding agent to harden in the air at room temperature.

[0028] If a joining agent is chosen that requires heating to reliably join the first and second strips, the heating, according to a preferred embodiment, takes place in the laminating machine itself, in which the strip will later be used.

[0029] In a preferred embodiment, the first tape is first inserted into the laminating machine, and then the second tape, optionally after applying a bonding agent to the first tape and / or the second tape, is laid or pulled over the first tape. Subsequently, the first tape and the second tape are joined together by heating and applying pressure / pressing them together, optionally via the bonding agent.

[0030] It is also conceivable to manufacture the conveyor belt in a separate device, i.e., to arrange the first and second belts in the separate device, possibly to provide them with a connecting element and to join them by means of heat input and pressure (e.g. by moving the tower).

[0031] A laminating system according to the invention, which uses the conveyor belt described above, has at least two rollers that are in contact with the first belt of the conveyor belt, so that the outer side of the first belt, provided with the sliding layer, is in contact with the rollers.

[0032] Advantageously, the laminating machine is designed to heat the first tape and / or the second tape to join the first tape to the second tape and to apply pressure to the first tape and the second tape to join the first tape to the second tape.

[0033] As described above, the heating of the first and / or second strip in the laminating machine can be achieved using heating elements that are also used for laminating a workpiece. Alternatively or additionally, heating in the laminating machine can be accomplished using special connecting elements suitable for providing the joining temperature required to join the first and second strips. Such connecting elements, such as welding or adhesive elements, can be made of steel and heated to temperatures up to 400°C.

[0034] As described above, the connecting elements can have integrated cooling. Connecting elements with integrated cooling are designed to both heat and cool the first and / or second belt. Connecting elements with integrated cooling are particularly advantageous in pulsed welding processes, as they enable rapid cooling of the previously heated section of the conveyor belt, thus allowing for faster pulse rates and accelerating the overall joining process. Integrated cooling can be achieved, for example, through bores in the connecting elements, through which a cooling medium is circulated during the cooling process. Suitable cooling media include air, nitrogen, water, oil, etc.

[0035] In summary, the conveyor belt according to the invention is characterized, on the one hand, by a perfectly smooth surface due to the use of steel on one of its outer sides, which leaves no seam or fabric imprints on the material being laminated. On the other hand, the conveyor belt is characterized by the fact that the other outer side, through the provision of a sliding layer, enables a reliable reduction of frictional resistance between the heating or cooling plates and the conveyor belt. Because the conveyor belt does not require sliding shoes or similar devices to reduce frictional resistance, the transfer of heat from the heating plates to the material being laminated through the conveyor belt is improved compared to solutions that use only a steel belt, and the lamination result is correspondingly improved. At the same time, a perfectly smooth surface can be provided on the side of the conveyor belt on which the material being laminated is located.Furthermore, the conveyor belt according to the invention can be easily replaced or repaired when worn. It is not necessary to replace other elements of the laminating system along with the conveyor belt. Depending on whether the connecting element used is detachable or not, only parts of the conveyor belt, such as the first belt or the second belt, can be replaced. Finally, with the conveyor belt according to the invention, if it is manufactured from a non-endless first belt, it is not necessary, as with single-layer textile belts of the prior art, to provide a cover at the point where the ends of the first belt meet. The thickening associated with such a cover can thus be avoided with the conveyor belt according to the invention, and the laminating result is further improved. Brief description of the characters

[0036] The invention is described below by way of example with reference to the attached figures, in which Fig. 1 is a schematic side view of a laminating machine, and Fig. 2 shows a longitudinal section through a conveyor belt according to the invention. Description of preferred embodiments

[0037] Fig. Figure 1 shows a schematic side view of a laminating machine 100. The laminating machine 100 has a transport unit 10. The transport unit 10 has a lower conveyor belt 11 and an upper conveyor belt 12. Alternatively, the transport unit 10 can also have only a single conveyor belt 11, 12. Both conveyor belts 11, 12 are designed as continuous circulating belts. Each conveyor belt 11, 12 is guided over two corresponding deflection rollers 1, 2. In addition, each conveyor belt 11, 12 is guided over a corresponding control roller 3. Alternatively, the conveyor belts 11, 12 can also be guided over only two or more than three rollers. One of the two deflection rollers 1, 2 can be designed as a drive roller 1, while the other of the two deflection rollers 1, 2 can be designed as a tension roller 2.Alternatively, at least one of the two conveyor belts 11, 12 can be designed not to be continuous (endless), but to be unwound and rewound, i.e., to be wound from one roll to another.

[0038] The in Fig. The transport device 10 shown, and thus also the lower conveyor belt 11 and the upper conveyor belt 12, rotate during the operation of the laminating machine 100, i.e., they move from left to right in the area that receives a laminating item 13 during the operation of the laminating machine 100. Fig. 1. The direction of movement of the conveyor belts 11, 12 together with the material to be laminated 13 is referred to as the transport direction T of the material to be laminated 13. The drive roller 1 and tension roller 2, each assigned to one of the conveyor belts 11, 12, are opposite each other in the transport direction T and, together with the respective control roller 3, tension the conveyor belt 11, 12 in a triangular shape in a side view. Since the distance between the drive roller 1 and the tension roller 2 of the upper conveyor belt 12 is shorter than the distance between the drive roller 1 and the tension roller 2 of the lower conveyor belt 11, the triangle formed by the upper conveyor belt 12 is smaller than the triangle formed by the lower conveyor belt 11. Accordingly, the upper conveyor belt 12 is shorter than the lower conveyor belt 11.

[0039] The laminating machine 100 further comprises several zones with different temperatures, the so-called temperature change zones, each containing several temperature change elements. More precisely, the laminating machine 100 has a heating zone 4, which has nine heating elements 4a, and a cooling zone 5, which has four cooling elements 5a. The number of heating elements 4a and cooling elements 5a can vary depending on the requirements of the laminating machine 100. Furthermore, the arrangement of the heating zones 4 and cooling zones 5 of the laminating machine 100 can also vary depending on the requirements. For example, the laminating machine 100 can also have several heating zones 4 and cooling zones 5, which are arranged alternately in the transport direction T or at least partially grouped and alternately, such as two cooling zones 5 followed by three heating zones, which in turn are followed by a cooling zone 5.

[0040] The temperature-changing elements 4a, 5a are, as in the illustrated embodiment, for example, plate-shaped, that is, with a flat top surface parallel to a flat bottom surface. Alternatively, however, the temperature-changing elements 4a, 5a can also be designed such that they do not have parallel top and bottom surfaces, but rather, for example, diverging or converging top and bottom surfaces.

[0041] As in Fig. As shown in Figure 1, the conveyor belts 11 and 12 run essentially parallel in the laminating zone, with the lower conveyor belt 11 and the upper conveyor belt 12 separated by a gap. Before or during a laminating process, the conveyor belts 11 and 12 can be moved towards or away from each other in a direction corresponding to their thickness direction, so that the gap is adjusted to the required dimension (depending on the thickness or contour of the workpiece to be laminated). The height of the gap between the conveyor belts 11 and 12 is thus adjustable. At the beginning of a laminating process, a workpiece to be laminated (not shown) is placed in the gap between the conveyor belts 11 and 12 of the laminating machine 100, and a laminating material 13 is pulled over the workpiece by the conveyor belts 11 and 12 while the workpiece moves in the transport direction T.By selectively heating and cooling the material to be laminated 13 using the heating and cooling elements 4a, 5a, the workpiece is reliably laminated and attached to the surface in . Fig. 1 right end of the laminating machine 100 ejected from it again.

[0042] Part of the heating elements 5 forms a welding or bonding zone 6. In the case of the Fig. In the embodiment of the laminating system 100 shown in Figure 1, the welding or bonding zone 6 comprises two welding or bonding elements 6a, which are heating elements 4a with a special design.

[0043] The welding or adhesive elements 6a are suitable for joining the individual components of the conveyor belts 11, 12 according to the invention, but can also be used for laminating a workpiece.

[0044] Fig. Figure 2 shows a longitudinal section through one of the conveyor belts 11, 12 according to the invention. As shown in the section in Fig. As can be seen in Figure 2, the conveyor belt 11, 12 comprises a first belt 7 and a second belt 9. The first belt 7 consists of a non-continuous fiberglass belt, one outer surface of which, more precisely, the outer surface when assembled into a conveyor belt, is provided with a sliding layer G, e.g., a polytetrafluoroethylene (PTFE) layer. The sliding layer G can either be applied as a separate layer to the corresponding outer surface of the first belt 7 or can be integrated into the first belt 7 by, for example, coating individual fibers of the fiberglass belt located on the corresponding outer surface with PTFE. Additionally or alternatively, it is also conceivable to incorporate PTFE particles into the fiberglass belt on the corresponding outer surface of the first belt 7. The first belt 7 is a non-continuous belt whose ends abut each other seamlessly (see the black line in the thickness direction of the second belt 7).

[0045] The second belt 9 is a steel belt and consists mainly of steel. It has almost the same dimensions as the first belt. At least one outer surface of the second belt 9, more precisely the outer surface when assembled into a conveyor belt, has a smooth surface.

[0046] The first strip 7 is fully bonded to the second strip 9 by a bonding agent 8, that is, over the entire surface of the corresponding outer surfaces of the first and second strips 7, 9, such that the PTFE-coated outer surface of the first strip 7 and the smooth outer surface of the second strip 9 face outside the conveyor belt 11, 12. The bonding agent is a thermoplastic adhesive, more precisely a thermoplastic adhesive film, which detachably bonds the first strip 7 and the second strip 9 by pressing the two strips 7, 9 together and heating at least one of the two strips 7, 9 and the adhesive film 8.

[0047] Looking at the circulating conveyor belt 11, 12, the laminating system consists of Fig. In the arranged state, the first belts 7 of the conveyor belts 11, 12 are each on the side of the rollers 1, 2, 3 of the conveyor belt 11, 12, i.e. inside the circulating conveyor belt 11, 12, while the second belts 9, which are steel belts, are on the outside, i.e. in the direction of the laminated material 13.

[0048] The conveyor belt 11, 12 can be manufactured outside the laminating machine 100. First, the bonding agent 8 is applied to the first belt 7 and / or the second belt 9, and then the first belt 7 and the second belt 9 are arranged one on top of the other. Next, at least one of the first belt 7 and the second belt 9, along with the bonding agent 8, is heated so that the bonding agent 8 adheres to or bonds with the first belt 7 and the second belt 9. This creates a strong bond between the first belt 7 and the second belt 9. The finished conveyor belt 11, 12 can then be inserted as a whole into a laminating machine.

[0049] Alternatively, the conveyor belt 11, 12 is manufactured directly in the laminating machine 100. For this purpose, the first belt 7 is first positioned over the rollers 1, 2, 3 in the laminating machine 100 such that the outer surface of the first belt 7, with the PTFE layer, is in contact with the rollers 1, 2, 3 and thus lies on an inner side of the formed triangle. Subsequently, the outer surface of the first belt 7, facing outwards within the formed triangle, is provided with the bonding agent 8. Then, the second belt 9 is positioned over the first belt 7. By selectively heating at least the first belt 7 and the bonding agent 8 using the welding and adhesive elements 6a, the first belt 7 and the second belt 9 are joined together via the bonding agent 8. Alternatively, in this manufacturing process for the conveyor belt 11, 12, the bonding agent 8 can also be applied to the second belt 9 or to both belts 7, 9.

[0050] In a laminating machine, which, as in Fig. As shown in Figure 1, two conveyor belts 11, 12 are used. Furthermore, when connecting the respective first belt 7 and the respective second belt 9 via the connecting element 8, the gap between the conveyor belts 11, 12 is reduced to a minimum, so that the upper conveyor belt 12 and the lower conveyor belt 11 lie on top of each other and exert pressure on each other. This allows for an even more efficient connection of the individual components of the conveyor belts 11, 12.

[0051] It is explicitly emphasized that all features disclosed in the description and / or the claims are to be considered separate and independent of one another for the purposes of the original disclosure as well as for the purpose of limiting the claimed invention, irrespective of the combinations of features in the embodiments and / or the claims. It is explicitly stated that all range specifications or specifications of groups of units disclose every possible intermediate value or subgroup of units for the purposes of the original disclosure as well as for the purpose of limiting the claimed invention, in particular also as a boundary of a range specification. Reference symbol list 1 drive roller 2 chip roller 3 Control roller 4 heating zones 4a Heating element 5 cooling zones 5a Cooling element 6 Welding / adhesive zone 6a Welding / adhesive element 7 PTFE glass fabric 8 adhesive film 9 steel band 10 Transport equipment 11 lower conveyor belt 12 upper conveyor belt 13 Laminated goods 100 laminating machines G Sliding layer T Transport direction

Claims

[1] Conveyor belt (11, 12) for a laminating system (100), comprising: a first band (7) which is provided with a sliding layer on at least one outer side, and a second band (9) comprising steel, wherein the first belt (7) and the second belt (9) are connected to each other over their entire surface by the connecting means (8), so that the sliding layer is arranged on an outer side of the conveyor belt (11, 12), and wherein, in the state of the conveyor belt (11, 12) inserted into the laminating system, the first belt (7) is adapted to be in contact with heating and cooling elements and rollers of the laminating system (100), and the second belt (9) is adapted to be in contact with a material to be laminated during a laminating process. [2] Conveyor belt (11, 12) according to claim 1, wherein a connecting means (8) is arranged between the first belt (7) and the second belt (9), and the first belt (11) and the second belt (12) are connected to each other over their entire surface by the connecting means. [3] Conveyor belt (11, 12) according to claim 1 or 2, wherein the sliding layer is a coating layer applied to the first belt (7). [4] Conveyor belt (11, 12) according to one of the preceding claims, wherein the sliding layer comprises PTFE. [5] Conveyor belt (11, 12) according to one of the preceding claims, wherein the sliding layer comprises graphite. [6] Conveyor belt (11, 12) according to one of the preceding claims, wherein the first belt (7) is a textile belt. [7] Conveyor belt (11, 12) according to claim 6, wherein the textile belt comprises a fabric. [8] Conveyor belt (11, 12) according to claim 6 or 7, wherein the textile belt is a glass fabric belt. [9] Conveyor belt (11, 12) according to one of the preceding claims, wherein the first belt (7) and / or the second belt (9) are designed as endless belts. [10] Conveyor belt (11, 12) according to one of claims 2 to 9, wherein the connecting means (8) is an adhesive. [11] Conveyor belt (11, 12) according to claim 10, wherein the adhesive is a thermoplastic. [12] Method for producing a conveyor belt (11, 12) for a laminating system (100), comprising the steps: Providing a first band (7) which is provided with a sliding layer on at least one outer side, Providing a second band (9) comprising steel, Arranging the first belt (7) and the second belt (9) in the laminating system (100) in such a way that the sliding layer of the first belt (7) is located on an outer side of the arrangement, Heating the first strip (7) and / or the second strip (9) using at least one heating element (4a) present in the laminating system and applying pressure to the first strip (7) and the second strip (9) to connect the first strip (7) to the second strip (9). [13] Method according to claim 12, further comprising the step of applying a connecting agent (8) to the first band (7) and / or the second band (9). [14] Method according to claim 12 or 13, wherein the connecting of the first band (7) and the second band (9) is carried out in a time-synchronized manner. [15] Laminating system (100), comprising at least two reels (1, 2, 3), and at least one conveyor belt (11, 12) according to one of claims 1 to 11, wherein the conveyor belt (11, 12) is arranged in the laminating system (100) in such a way that the outer side of the first belt (7) provided with the sliding layer is in contact with the rollers (1, 2, 3) and the second belt (9) is in contact with a material to be laminated during a laminating process. [16] Laminating system (100) according to claim 15, wherein the laminating system (100) is designed to heat the first band (7) and / or the second band (9) and to apply pressure to the first band (7) and the second band (9) to connect the first band (7) to the second band (9). [17] Laminating system according to claim 16, wherein the heating in the laminating system (100) is carried out by using at least one laminating heating element (4a). [18] Laminating system according to claim 16, wherein the heating in the laminating system (100) is carried out by using at least one connecting element (6a) which is suitable for providing the connecting temperature required for the connection of the first and second strips (7, 9). [19] Laminating system according to claim 18, wherein the at least one connecting element (6a) has an integrated cooling in the form of cooling bores.

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