EP3386752A1

EP3386752A1 - Heatable roller, in particular for laminating devices, and laminating device having a heatable roller of this type

Info

Publication number: EP3386752A1
Application number: EP16801393.6A
Authority: EP
Inventors: Bernd Loibl
Original assignee: Monolith GmbH Buerosysteme
Current assignee: Monolith GmbH Buerosysteme
Priority date: 2015-12-22
Filing date: 2016-11-04
Publication date: 2018-10-17
Also published as: US20170274637A1; US10479062B2; DE202015107028U1; WO2017108243A1

Abstract

The invention relates to a heatable roller (12, 13), in particular laminating roller for laminating devices (1), comprising a roller body (19) having a cylindrical outer surface and defining a longitudinal axis (L), an elastic roller cover (20) held on the outer surface of the roller body (19), and a bar-shaped heating module (27) arranged in a central axial through-opening (36) of the roller body (19) and at least rotationally fixed to the roller body (19), wherein the roller body (19) comprises a cylindrical roller tube (21) made of a heat-conducting material, defining the central axial through-opening (36), in which the bar-shaped heating module (27) is arranged.

Description

DESCRIPTION

Heatable roller, in particular for laminating apparatus, and laminating apparatus with such a heatable roller

The invention relates to a heatable roller, in particular a laminating roller for laminating, with a roller body which has a cylindrical outer surface and defines a longitudinal axis, an elastic roller cover, which is held on the outer surface of the roller body, and a rod-shaped heating module, which in a arranged central axial passage opening of the roller body and is connected to the roller body at least rotationally fixed.

For the protection of sheet material, in particular of valuable documents, it is known to weld the sheet material with a laminating film. In this case, the sheet material is placed between two film sheets forming a laminating film, which are then transported together through a laminating device. The foil sheets can also be in the form of a laminating foil bag, in which the two foil sheets are connected to one another at at least one side edge. Such laminating films are known, for example, from DE 201 00 328 U1. Characteristic of laminating films is that they are formed as composite films in which a transparent, clear film of e.g. Polyester or polypropylene is provided on the inside with a heat-sensitive adhesive layer, which consists for example of EVA (ethylene-vinyl acetate copolymer).

In the non-industrial field, ie in the office and private sector, laminators usually designed as table devices are used. Such Niergeräte are known for example from DE 20 2009 000 903 U1. They have essentially the same basic structure with a device housing in which a laminating unit is arranged. Between a feed opening on one side and an outlet opening on the other side of the device housing extends a passage channel, which is associated with the laminating unit. The latter usually has a pair of rollers, in some cases also a plurality of pairs of rollers, each consisting of two stacked, forming a laminating nip laminating exist. In this case, the Lanninierspalt is set so that the combination of sheet material and laminating foil in the laminating gap is subjected to considerable pressure.

In Heißlaminiergeräten one of the laminating rollers, usually both, heated. When passing through a combination of sheet material and laminating this combination is thus additionally heated in the laminating. This makes the adhesive layer of the laminating film adhesive and ensures a connection of the foil sheets with each other and the sheet material to be welded. The temperature during hot lamination is set so that the part of the foil sheets, which consists of the clear film is not affected by the action of heat.

Rod-shaped heating modules are generally used for heating the laminating rollers. From DE 20 201 1 052 223 U1, for example, a laminating roller is known in which a heating module, which consists of a PTC heating rod surrounded by an insulating film ("Positive Temperature Coefficient" heating rod), into a central axial passage opening of a heat-conducting and temperature-resistant roll body of the laminating roller is installed. However, resistive heating rods of the prior art are also known, for example. A PTC heating element has a temperature resistance behavior which causes the generated heat output to decrease as the temperature rises, ie the PTC heating element is largely self-contained. gelnd. In such PTC heating elements can therefore be dispensed with an external control or regulation and overheating protection. Another advantage of such heating elements is that different thickness laminating can be laminated at the same temperature, since the PTC heating element automatically controls the heat energy according to the heat demand, ie with a thinner film less heat energy is provided as a thicker film.

In the laminating roller, which is known from DE 20 201 1 052 223 U1, the roller body consists of two roller core elements, which are assembled to form the roller body. By assembling the two components, it is not possible to ensure a perfectly cylindrical outer surface of the roll body without edges or protrusions. However, such would be necessary to raise, for example, a hollow cylindrical tube as a roll cover on the roll body. If a tube is pulled onto the roller body known from DE 20 201 1 052 223 U1, the tubing is often tilted with edges or protrusions on the outer surface of the roller body. For this reason, among other things, it is often dispensed with in the prior art to wind up the roll cover. Instead, the roll body is encapsulated after assembly with the material of the roll cover. Since accurate and uniform encapsulation is not always possible, reject rates in the production of laminating rolls are on the order of 17%. In particular, in the case of edges or protrusions on the outside of the roll body, it is difficult to spray a roll cover of constant thickness.

The invention is based on the object of providing a heatable roller of the type mentioned at the outset with an alternatively configured roller body. provide a reduction in the exclusion rate in the production of such heatable rollers and thus cost savings.

This object is achieved according to the invention in that the roller body comprises a cylindrical roller tube made of a thermally conductive material, which defines the central axial passage opening in which the rod-shaped heating module is arranged.

The basic idea of the invention is thus to use a tube with an exactly cylindrical outer surface as part of the roll body. The cylindrical roller tube is a one-piece component. The danger known from the prior art that different components of the roller body shift relative to one another or have manufacturing tolerances, so that an exactly cylindrical outer surface of the roller body can not be ensured, does not exist in the roller body designed according to the invention.

By the invention it is also possible on the roll tube as a roll cover a hose made of elastomeric material, preferably silicone Konelastomermaterial, raise, in particular with radially inwardly directed bias to ensure good heat transfer from the roller tube to the hose. The roller tube can also be pushed into a tube whose inner diameter is slightly larger than the outer diameter of the roller tube. Subsequently, the tube can be shrunk so similar to a known from electrical shrink tubing so that it is fixed axially and rotationally fixed on the outer surface of the roller tube. In this way, the reject rate in the production of laminating rollers can be significantly reduced. Alternatively, it is also possible to spray on the roller tube as a roll cover a rubber-elastic material, preferably silicone elastomer material, and / or bake.

Conveniently, the roller tube made of steel, aluminum, copper or an alloy thereof to ensure optimum thermal conductivity. The outer diameter of the roller tube surrounded by an elastic roller cover in the form of a cylindrical shell, which corresponds to the outer diameter of the heatable roller, is preferably 13 to 19 mm, in particular 16 mm. The roll cover may also have a curved outer surface. Because during lamination, the laminating rollers are pressed together, which is why a slightly convex roller cover can compensate.

Advantageously, the rod-shaped heating module is fixed in the roller tube by means of press fit, preferably in such a way that at least a part of the outer surfaces of the rod-shaped heating module bear under pressure prestress against the inner surface of the passage opening. This ensures a particularly good heat transfer through heat conduction.

Preferably, the passage opening of the roller tube has a circular cross-section. In such a case, any commercial cylinder tube having sufficient heat conductivity and the appropriate dimensions can be used as a roller tube. In particular, a rod-shaped heating module having a circular or square cross-section can be pushed axially into the through-opening of the tube without special attention being paid to alignment. However, it is also possible to make the passage opening polygonal. Correspondingly designed surfaces on the outside of the rod-shaped heating module then offer the advantage that this can be positively connected to the pipe. In a correspondingly corresponding embodiment, therefore, the rod-shaped heating module can be stored directly in the roller tube.

According to one embodiment of the invention, the roller body comprises a heat-conducting roller core with a cylindrical or substantially cylindrical outer surface, which is designed as a solid core with a matching to the cross section of the rod-shaped heating module and this gap-free enclosing central receiving channel, the rod-shaped heating module preferably on all sides with a press fit in recorded in the receiving channel. The rod-shaped heating module is thus arranged within a receiving channel enclosing gap-free, wherein the roller core is otherwise formed as a solid core material. Conveniently, the roll core is made of metal, preferably aluminum, copper or an alloy thereof, or of any other metallic alloy, such as steel. Because of the weight and the good thermal conductivity, aluminum or an aluminum alloy is particularly suitable. As a result, an optimal heat transfer from the rod-shaped heating module is achieved on the surface of the heatable roller. The loss-inducing heating of air is avoided by this training. Due to the optimal heat conduction to the outer sides of the heatable roller, the rod-shaped heating module can be operated at a significantly lower temperature, for example at temperatures between 140 to 145 ° C, compared to an arrangement in which a considerable amount of air is heated. The lower operating temperatures of the rod-shaped heating module result in a significantly reduced energy consumption. The heated rollers can also be manufactured with a much smaller outer diameter, whereby the housing of an operating device can be designed smaller. For the purposes of the present invention, the term "gap-free" is to be understood as meaning a dimensioning of the receiving channel in relation to the dimensions of the rod-shaped heating module, in any case a slight clearance between the rod-shaped heating module and the walls of the receiving channel is present, preferably a mutual contact, so that the heat transfer takes place substantially by heat conduction.

Preferably, the rod-shaped heating module should be received on all sides with a press fit in the receiving channel, i. in such a way that at least a part of the outer sides of the rod-shaped heating module bear under pressure prestress against at least a part of the inner sides of the receiving channel. This ensures a particularly good heat transfer through heat conduction. Characterized in that the roller body of the heatable roller according to the invention comprises not only a roller tube but also a roller core, it is possible by a corresponding dimension of the receiving channel to integrate heating modules of different dimensions.

Preferably, the roller core is inserted axially together with the rod-shaped heating module in the passage opening of the roller tube and in particular by means of press fit rotationally and axially connected to the roller tube. If the outer diameter of the cylindrical roller core corresponds to the inner diameter of the cylindrical passage opening of the roller tube or if these diameters are at least substantially identical, then the roller core can be cooled and / or the roller tube can be heated, for example, after insertion into the passage opening and cooling or heating of the components to achieve a press fit. Of course, the roller core can also be fixed in the roller tube in any other suitable manner. Due to the fact that the roller core is inserted into the roller tube together with the rod-shaped heating module, different types of heating modules can be put into a specific pre-set position according to customer wishes and device requirements. Benes roller tube are inserted. This allows a particularly high flexibility.

Advantageously, the roll core is split longitudinally into two roll core sections to form a parting line which cuts the receiving channel. This facilitates the insertion of the rod-shaped heating module, since it can be inserted transversely to its longitudinal axis in the receiving channel in this case, which is particularly advantageous if - as mentioned above - a fixation of the rod-shaped heating module should be done by means of interference fit. In this case, a parting line that intersects the receiving channel is also to be understood as one in which the parting line extends along one of the inner sides of the receiving channel.

The roller core sections can rest under prestress on the rod-shaped heating module. In this case, the mutually facing end faces of the roll core sections may be spaced apart by the parting line. In this way, the rod-shaped heating module is clamped. It is also possible that the parting line is closed from a certain bias, so that the front ends are in contact with each other. However, embodiments are also conceivable in which the front ends of the roller core sections abut each other in general, in order to clamp the rod-shaped heating module in this way. This can be done by screwing. However, it is simpler to provide at least one latching device by means of which the two roller core sections are clamped together by mutual pressing.

In order to achieve a defined position of the roll core sections to each other, they can interlock positively seen in the transverse direction in such a way that they lead in the transverse direction against each other. Of course, this can also be done in the longitudinal direction. The heating module preferably has a heating rod, in particular a PTC heating rod, which is wound with a heat-conducting, electrically insulating film. In particular, a PTC heating element is advantageous because it has a temperature resistance behavior that causes the generated heat output to decrease with increasing temperature. But it can also be used other heating elements, such as resistance heating elements. Advantageously, the heat-conducting, electrically insulating film is a carbon film or a filled elastomer film, such as a polyester-based, a silicone-based or a silicone-free filled elastomeric film. For example, a self-adhesive carbon heat-conducting foil can be used whose adhesive layer is electrically insulating. For example, a silicone-based film includes a silicone elastomer filled with thermally conductive ceramic materials. From WO2006015569A1 are also Wärmeleitfolien of a silicone-free elastomeric aliphatic polyurethane or from polydimethylsiloxane, which are filled with appropriate fillers. Preferred film thicknesses range from 0.1 mm to 5 mm. Often, film thicknesses in the range of 0.1 mm to 0.3 mm are sufficient.

Expediently, the PTC heating element has a multiplicity of PTC heating elements arranged in succession along the longitudinal axis, in particular cuboidal, which are bordered on both sides by metal electrodes on their longitudinal sides. The metal electrodes are preferably flat electrodes, that is to say plates supplied with current, which preferably extend over the length of the PTC heating rod. The PTC heating element is preferably made of ceramic with barium nitrate as the base material.

According to an alternative embodiment of the invention, the metal electrodes have a trapezoidal cross-section, so that the PTC heating element has substantially the overall shape of a cuboid whose longitudinal edges are bevelled and which bear against the inner surface of the roller tube. In particular, when the passage opening of the roller body is limited by a plurality of flat surfaces, such beveled longitudinal edges can come to rest on corresponding surfaces of the passage opening. In the case of a cylindrical passage opening, it may be useful if the longitudinal edges of the cuboid are rounded, wherein the radius of curvature of the rounding should correspond to the inner radius of the passage opening.

In this case, free spaces are preferably formed in the region of the metal electrodes between the PTC heating rod wrapped with the film and the inner surface of the roller tube, each of which is completely filled by a circular segment-shaped supporting element, in particular of steel, aluminum, copper or an alloy thereof , As a result, the air in the passage opening is reduced and a better heat transfer from the PTC heating element to the roller tube is made possible. In addition, this increases the interference fit of the rod-shaped heating module within the roller tube.

In an alternative embodiment, when the roller tube has a circular inner cross-section, the metal electrodes have a circular segment-like or substantially circular segment-like cross section, so that the PTC heating element has a substantially cylindrical outer shape and the film at least in the region of the metal electrodes on the inner surface of the roller tube is applied. This contributes to a good heat transfer and a strong press fit of the rod-shaped heating module within the roller tube.

Preferably, the PTC heating element is aligned such that the provided on the opposite longitudinal sides of the PTC heating elements metal electrodes of the PTC heating element are each positioned only in one of the two roller core sections and thus on opposite sides of the parting line. Among other things, a particularly efficient heat dissipation is ensured in the field of metal electrodes, since there is no parting line in this area of the roll core.

The aforementioned object of the invention is also achieved by a laminating apparatus for hot lamination of sheet material and laminating film, comprising a device housing through which passes a passage for a combination of sheet material and laminating film in which a laminating unit with at least one pair of opposite, a laminating gap of releasing laminating rollers is arranged, wherein at least one of the two each forming a pair of laminating rollers is a heatable roller according to the invention, solved. Conveniently, however, both laminating rollers may also be heatable rollers according to the invention. It is understood that several pairs of laminating rollers may also be present, wherein the laminating rollers may each be heatable rollers according to the invention. With the heatable roller described above, therefore, a heatable roller with an alternatively configured roller body is provided for the first time, which enables a reduction in the exclusion rate in the production of such heatable rollers and thus cost savings. Further features and advantages of the present invention will become apparent from the following description of an embodiment of the laminating apparatus according to the invention and three embodiments of the heatable roller according to the invention with reference to the accompanying drawings. In it is: Figure 1 is an oblique view of the back of an embodiment of the laminating apparatus according to the invention;

FIG. 2 shows the laminating apparatus according to FIG. 1 in cross section;

Figure 3 is a side view of a Lanninierwalze invention of the laminating apparatus according to the invention according to Figures 1 and 2 according to a first embodiment; a cross section through the Lanninierwalze according to Figure 3 in the plane IV-IV; a cross section through the Lanninierwalze according to Figure 4 in the plane V-V; a cross section through a Lanninierwalze invention of the laminating apparatus according to the invention according to Figures 1 and 2 according to a second embodiment; a cross section through the Lanninierwalze according to Figure 6 in the plane VII-VII; a cross section through a Lanninierwalze invention of the laminating apparatus according to the invention according to Figures 1 and 2 according to a third embodiment; and

Figure 9 is an oblique view of the head end of a laminating with the

Lanning roll according to FIG. 3. The laminating apparatus 1 shown in FIGS. 1 and 2 has a housing 2 with a flat housing bottom 3, a front wall 4, a rear wall 5 and an arcuate top wall 6 connecting the front wall 4 and the rear wall 5 Cooling slots - exemplified with 7 - provided.

From the rear wall 5 to the front wall 4 extends through the housing 2, an obliquely downwardly directed passage channel 8 in such a width that DIN A4 sheet material can be passed through landscape format. The passage channel 8 is bounded on the input side by a feed opening 9 in the rear wall 5 and an outlet opening 10 in the front wall 4.

Approximately in the middle of the pass-through channel 8 is a laminating unit 1 1, of which here two superimposed with their axes of rotation parallel to each other laminating rollers 12, 13 can be seen. The laminating rollers 12, 13 extend over the entire width of the passage channel 8 and form a laminating gap 14 between them. The laminating rollers 12, 13 are - which is explained in more detail in Figures 3 to 9 - heated. They are also part of a transport device, which includes an electric motor, not shown here drive synchronously drives the two laminating rollers 12, 13 during the lamination, namely the upper laminating roller 12 in the clockwise direction and the lower lamination roller 13 counterclockwise. Their peripheral speeds are identical.

Attached to the rear wall 5 is a sheet support 15, the top 16 is flush with the underside of the flow channel 8 and inclined in the same direction as the flow channel 8 itself. Adjacent to the feed opening 9 protrude beyond the top 16 of the sheet support 15 also two guide webs 17, 18, who are facing each other and who due mechanical coupling in the opposite direction are movable in such a way that does not shift in an adjustment, the center of the distance between the two. The distance of the guide webs 17, 18 is adapted in this way to the format of each laminating combination of laminating film and sheet material that both side edges of this combination when inserted into the passage channel 8 through the guide webs 17, 18 are guided and the laminating in centric the passage channel 8 enters.

The laminating roller 12 shown in FIGS. 3, 4 and 5, which is insulated from the laminating apparatus 1, has a roller body 19 which has a cylindrical outer surface and defines a longitudinal axis L.

On the outer surface of the roller body 19, an elastic roll cover 20 is held. The roll cover 20 is in this embodiment, mounted on the roller body 19 hose made of a silicone elastomer material. Alternatively, the roll cover 20 may also be sprayed onto the roll body 19.

The roller body 19 comprises a hollow-cylindrical roller tube 21 made of a thermally conductive material and a heat-conducting roller core 22 with a substantially cylindrical outer surface. Here, the roller tube 21 and the roller core 22 are preferably made of metal, preferably aluminum, copper or an alloy thereof, or of any other metallic alloy, such as steel. The roller core 22 is formed in the embodiment shown here as a solid core material with a central in cross-section substantially rectangular receiving channel 23 which extends over the entire length of the roller core 22. Under formation of a receiving channel 23 intersecting parting line 24 of the roller core 22 is longitudinally divided into two roller core sections 25, 26. The parting line 24 extends over the entire length of the roller core 22. In an embodiment not shown here, the parting line 24 may also have multiple gradations, which lead the two roller core sections 25, 26 in the transverse direction against each other. Due to the parting line 24, the outer surface of the roller core 22 is referred to as substantially cylindrical.

Inserted into the receiving channel 23 is a rod-shaped heating module 27, which has a PTC heating rod 27a, which is wrapped with a heat-conducting, electrically insulating film 27b in the form of a carbon film. In other embodiments, the film 27b may also be a filled elastomeric film such as a polyester-based, a silicone-based or a silicone-free filled elastomeric film, or any other known electrically insulating heat-conducting film. The PTC heating element in the embodiment shown here consists of ceramics with barium nitrite as base material. It has a multiplicity of parallelepiped-shaped PTC heating elements 28 which are arranged one behind the other along the longitudinal axis L and are bordered on both sides by metal electrodes 29, 30 on their longitudinal sides. In Figure 5, the plurality of PTC heating elements 28 can not be seen. The metal electrodes 29, 30 have a trapezoidal cross section, so that the PTC heating rod 27a has substantially the overall shape of a cuboid whose longitudinal edges 31, 32, 33, 34 are bevelled. The receiving channel 23 of the roller core 22 is adapted to the cross section of the rod-shaped heating module 27, so that the rod-shaped heating module 27 is so closely enclosed by the inner sides of the receiving channel 23, that its inner sides abut the film 27b. The rod-shaped heating module 27 is thus received in the embodiment shown here with a press fit in the receiving channel 23.

The arrangement of the rod-shaped heating module 27 in the receiving channel 23 takes place in such a manner that the two roller core sections 25, 26 are initially separated from each other, so that the rod-shaped heating module 27 in a the two roller core sections 25, 26 can be used. Then the other of the two roller core sections 25, 26 is placed. The two roller core sections 25, 26 are then in contact with the rod-shaped heating module 27, wherein the mutually facing end faces of the roller core sections 25, 26 are spaced apart by the parting line 24. As can be seen in FIG. 4, the PTC heating element 27a is oriented in such a way that the metal electrodes 29, 30 of the PTC heating element 27a provided on the opposite longitudinal sides of the PTC heating elements 28 only in one of the two roller core sections 25, 26 and thus opposite sides of the parting line 24 are positioned.

The roller core 22 is inserted axially together with the rod-shaped heating module 27 in the central axial through hole 35 circular cross section of the roller body 19 and connected by means of press fit rotationally and axially fixed to the roller tube 21.

FIGS. 6 and 7 show a second embodiment of the laminating roller 12 according to the invention. Again, the roller body 19 comprises a roller tube 21, which has a cylindrical outer surface and defines a central axial passage opening 35 with a circular cross-section. In the through hole 35, a rod-shaped heating module 27 is axially inserted, which corresponds to the rod-shaped heating module 27, which has already been described in connection with Figures 4 and 5. In contrast to the first embodiment, the beveled longitudinal edges 31, 32, 33, 34 of the cuboid lie not on inner surfaces of the receiving channel 23, but on the inner surface 36 of the roller tube 21 at. Further, the laminating roller 12 according to the second embodiment does without a roller core 22. Instead, in the region 37 of the metal electrodes 29, 30 between the foil 27b wrapped with the PTC heating rod 27a and the inner surface 36 of the roller tube 21 free spaces are formed, each fully are constantly filled by a circular segment-shaped support member 38. Similar to the roller core 22 of Figures 4 and 5, the support member 38 is preferably made of steel, aluminum, copper or alloys thereof. With regard to further possible features and advantages, reference is made in particular to the description of FIGS. 4 and 5.

FIG. 8 shows a third embodiment of the laminating roller 12 according to the invention. In this case, the metal electrodes 29, 30 have a substantially circular segment-like cross section, so that the PTC heating element 27a has a substantially cylindrical outer shape and the film 27b rests against the inner surface 36 of the roller tube 21 at least in the region of the metal electrodes 29, 30. This third embodiment thus comes without both roller core 22 and without support members 38. Here, too, reference is made in particular to the description of FIGS. 4 and 5 with regard to further possible features and advantages.

FIG. 9 shows the head end of the laminating unit 1 1 with the laminating rollers 12, 13. They are rotatably mounted in a head plate 39, which is held fixed in the laminating device 1 by the apparatus. A corresponding storage is provided at the other, not shown here end of the laminating unit 1 1. The laminating rollers 12, 13 continue in contact sections 40, 41, each having two spatially separated cylindrical contact rings 42, 43 for the laminating roller 12 and contact rings 44, 45 for the laminating roller 13. At the contact rings 42 to 45 are each a sliding contact lug 46, 47, 48, 49, which are connected to an electrical power supply. Electric current is supplied to the contact rings 42, 43, 44, 45 via the sliding contact lugs 46, 47, 48, 49. The contact rings 42, 43 are connected to the metal electrodes 29, 30 in the laminating roller 12 and the contact rings 44, 45 with the metal electrodes of the PTC heating rod 27 a in the Laminating roller 13 connected such that the PTC heating rods 27a are heated in operation to a temperature of 140 to 145 ° C.

Between each of a contact portion 40, 41 belonging pair of contact rings 42, 43 and 44, 45 a spur gear 50, 51 is arranged in each case. They are rotatably connected to the Lanninierwalzen 12 and 13, and they mesh with each other. About one of the two gears 50, 51 is engaged with the drive pinion of an electric motor, not shown here, via which the two Lanninierwalzen 12, 13 are driven when the laminating 1 is in operation.

LIST OF REFERENCE NUMBERS

1 laminator

2 housings

3 caseback

4 front wall

5 back wall

6 upper wall

7 cooling slots

8 flow channel

9 feed opening

10 outlet opening

1 1 laminating unit

12 laminating roller

13 laminating roller

14 laminating gap

15 sheet edition

16 top of the sheet pad

17 guide bar

18 guide bar

19 roll body

20 roll cover

21 roller tube

22 roll core

23 recording channel

24 parting line

25 roll core section

26 roll core section

27 rod-shaped heating module

27a heating rod 27b slide

28 PTC heating elements

29 metal electrode

30 metal electrode

31 Longitudinal edge of the PTC heating element

32 Longitudinal edge of the PTC heating element

33 Longitudinal edge of the PTC heating element

34 Longitudinal edge of the PTC heating element

35 passage opening

36 inner surface of the roller tube

37 area of the metal electrodes 29, 30

38 support element

39 headstock

40 contact section

41 contact section

42 Contact ring for Lanninierwalze 12

43 Contact ring for Lanninierwalze 12

44 contact ring for Lanninierwalze 13

45 Contact ring for Lanninierwalze 13

46 sliding contact lug

47 sliding contact lug

48 sliding contact lug

49 sliding contact lug

50 spur gear

51 spur gear

Claims

A heatable roller (12, 13), in particular laminating roller for laminating equipment (1), having a roller body (19) which has a cylindrical outer surface and defines a longitudinal axis (L), an elastic roller cover (20) attached to the Outer surface of the roller body (19) is held, and a rod-shaped heating module (27) disposed in a central axial passage opening (36) of the roller body (19) and at least rotatably connected to the roller body (19), characterized in that the roller body (19) comprises a cylindrical roller tube (21) made of a thermally conductive material, which defines the central axial passage opening (36), in which the rod-shaped heating module (27) is arranged.

2. Heatable roller (12, 13) according to claim 1, characterized in that the rod-shaped heating module (27) is fixed in the roller tube (21) by means of press fit.

3. Heatable roller (12, 13) according to claim 1 or 2, characterized in that the passage opening (36) of the roller tube (21) has a circular cross-section.

4. heatable roll (12, 13) according to claim 3, characterized in that the roller body (19) comprises a heat-conducting roller core (22) having a cylindrical or substantially cylindrical outer surface, which as solid material core with a to the cross section of the rod-shaped heating module ( 27) adapted and this gap-free enclosing central receiving channel (23) is formed, wherein the rod-shaped heating module (27) is preferably received on all sides with a press fit in the receiving channel (23), and that the roll core (22) together with the rod-shaped heating module (27) axially in the passage opening (36) of the roller tube (21) inserted and in particular by means of press fit rotationally and axially fixed to the roller tube (21) is connected.

5. Heatable roller (12, 13) according to claim 4, characterized marked, that the roller core (22) in two roller core sections (25, 26) under

Forming a receiving channel (23) intersecting parting line (24) is divided longitudinally.

6. heatable roller (12, 13) according to claim 5, marked thereby, that the roller core portions (25, 26) biased against the rod-shaped heating module (27).

7. Heatable roller (12, 13) according to claim 6, characterized in that the mutually facing end faces of the Walzenkernab- sections (25, 26) by the parting line (24) opposite each other.

8. heatable roller (12, 13) according to claims 5 to 7, characterized in that the roll core sections (25, 26) seen in the transverse direction interlock positively engage such that they lead in the transverse direction against each other.

9. Heatable roller (12, 13) according to any one of claims 4 to 8, characterized in that the roller core (22) made of metal, preferably aluminum, copper or an alloy thereof, or of any other metallic alloy, such as steel ,

10. Heated roll (12, 13) according to any one of the preceding claims, characterized in that the roller tube (21) consists of steel, aluminum, copper or an alloy thereof.

1 1. Heatable roller (12, 13) according to any one of the preceding claims, characterized in that on the roller tube (21) as a roll cover (20) a hose made of a rubber-elastic material, preferably silicone elastomer material, in particular with radially inwardly directed bias is mounted ,

12. heatable roller (12, 13) according to one of claims 1 to 10, characterized in that on the roller tube (21) as a roll cover (20), a rubber-elastic material, preferably Silikonelastomermaterial, sprayed and / or baked.

13. Heatable roller (12, 13) according to any one of the preceding claims, characterized in that the heating module (27) has a heating element (27a), in particular a PTC heating element, which is wound with a thermally conductive electrically insulating film (27b) ,

14. Heatable roller (12, 13) according to claim 13, characterized in that the film (27b) is a carbon foil or a filled elastomeric film, such as a polyester-based, a silicone-based or a silicone-free filled elastomeric film.

15. Heated roll (12, 13) according to claim 13 or 14, characterized in that the PTC heating element (27a) has a plurality of along the longitudinal axis (L) successively angeordeten cuboid PTC heating elements (28), on their longitudinal sides of metal electrodes (29, 30) are enclosed on both sides.

16. Heatable roll (12, 13) according to claim 15, characterized in that the metal electrodes (29, 30) have a trapezoidal cross-section, so that the PTC heating rod (27a) substantially the overall has a shape of a cuboid whose longitudinal edges (31, 32, 33, 34) are chamfered and bear against the inner surface of the roller tube (21).

17. Heatable roller (12, 13) according to claim 16, characterized marked, that in the region (38) of the metal electrodes (29, 30) between the with the

Foil (27b) wound PTC heating element (27a) and the inner surface (37) of the roller tube (21) free spaces are formed, each completely by a circular segment-shaped support member (39), in particular of steel, aluminum, copper or alloys thereof, filled ,

18. Heatable roller (12, 13) according to claim 3 and one of claims 15 to 17, characterized in that the metal electrodes (29, 30) have a circular segment-like or substantially circular segment-like cross section, so that the PTC heating element (27 a) has substantially cylindrical outer shape and the film (27b) at least in the region of the metal electrodes (29, 30) on the inner surface (37) of the roller tube (21).

19. Heatable roller (12, 13) according to one of claims 5 to 8 and one of claims 15 to 17, characterized in that the

PTC heating element (27 a) is oriented such that the provided on the opposite longitudinal sides of the PTC heating elements (28) metal electrodes (29, 30) of the PTC heating element (27 a) only in one of the two roller core sections (25, 26) and thus positioned on opposite sides of the parting line (24).

20. Heatable roller (12, 13) according to any one of claims 13 to 19, characterized in that the PTC heating element (27a) consists of ceramic with barium nitrate as the base material.

21. Laminating device (1) for hot lamination of sheet material and Lanninierfolie, with a device housing (2) through which passes a passage (8) for the passage of a combination of sheet material and Lanninierfolie, in which a laminating unit (1 1) with at least one pair a laminating gap (14) of free laminating rollers (12, 13) is arranged, wherein at least one of the two each forming a pair of laminating rollers (12, 13) is a heatable roller according to one of the preceding claims.

22. laminating apparatus (1) according to claim 21, characterized in that the two laminating rollers (12, 13) are heatable rollers according to one of claims 1 to 20.