阅读说明：本技术 用于连续工作的双带压机的滑动面密封装置和双带压机 (Sliding surface sealing device for a continuously operating double belt press and double belt press ) 是由 G.布利克尔 R.费塞尔 J.戈斯达 S.普费弗 于 2019-07-26 设计创作，主要内容包括：本发明涉及一种用于连续工作的双带压机的滑动面密封装置,双带压机用于制造循环的材料幅材、如层压材料、尤其是铜层压材料、装饰层压材料、纤维增强的塑料层压材料和/或其他的工业用层压材料,其中,滑动面密封装置(01)具有用于密封地贴靠在挤压带(04)的内侧(11)的密封面(12),并且滑动面密封装置(01)具有构造密封面(12)的密封元件(02)和至少部分容纳密封元件(02)的密封框架(03),用于将滑动面密封装置(01)可运动地支承在基本元件(07)中、尤其是加热板中,其中,在密封框架(03)与密封元件(02)之间至少沿挤压方向布置有压缩元件(17),压缩元件通过弹性压缩能够实现密封元件(02)相对于密封框架(03)的相对运动。(The invention relates to a sliding-surface sealing device for a continuously operating double belt press for producing endless material webs, such as laminates, in particular copper laminates, decorative laminates, fiber-reinforced plastic laminates and/or other industrial laminates, wherein the sliding-surface sealing device (01) has a sealing surface (12) for sealingly abutting against an inner side (11) of a press belt (04), and the sliding-surface sealing device (01) has a sealing element (02) forming the sealing surface (12) and a sealing frame (03) at least partially accommodating the sealing element (02) for movably mounting the sliding-surface sealing device (01) in a base element (07), in particular a heating plate, wherein a compression element (17) is arranged between the sealing frame (03) and the sealing element (02) at least in the pressing direction, the compression element enables a relative movement of the sealing element (02) relative to the sealing frame (03) by means of elastic compression.)

1. A sliding-surface sealing device for a continuously operating double belt press for producing continuous material webs, such as laminates, in particular copper laminates, decorative laminates, fiber-reinforced plastic laminates and/or other industrial laminates, having an upper and a lower continuous press belt (04) guided by deflection rollers, wherein a reaction zone (13) is formed between the mutually opposite outer sides of the press belts, in which the material web is guided and is pressed under planar pressure, and having a pressure chamber (08) which at least partially generates planar pressure and which is formed in the reaction zone (13) between a base element (07), in particular a heating plate, and the inner side (11) of the press belt (04), can be charged with a fluid pressure medium, and is laterally delimited and sealed by at least one annular, self-closing sliding-surface sealing device (01), wherein the sliding-surface sealing device (01) has a sealing surface (12) for sealingly bearing against an inner side (11) of the press belt (04), and the sliding-surface sealing device (01) has a sealing element (02) forming the sealing surface (12) and a sealing frame (03) at least partially accommodating the sealing element (02) for movably mounting the sliding-surface sealing device (01) in a base element (07), in particular in a heating plate,

characterized in that a compression element (17) is arranged between the sealing frame (03) and the sealing element (02) at least in the pressing direction, said compression element being capable of effecting a relative movement of the sealing element (02) relative to the sealing frame (03) by elastic compression, in particular as a reaction to a pressure application of the sliding face seal (01) in the pressing direction.

2. The sliding surface sealing device according to claim 1, characterized in that the compression element (17) is configured as a self-closing O-ring or as a built-in, non-closing sealing strip with a circular cross-section.

3. The sliding face sealing device according to claim 1 or 2, characterized in that the sealing frame (03) has a groove (18) for accommodating a sealing element, wherein the compression element (17) is arranged along a groove bottom (19) of the groove (18).

4. The sliding face seal arrangement according to one of claims 1 to 3, characterized in that the sealing element (02) is made at least in sections of a material with a low modulus of elasticity, in particular a polymer or a metal.

5. The sliding surface sealing arrangement according to one of claims 1 to 4, characterized in that the sealing element has a blind hole (22) or a milled-out portion at least in regions on a side surface (23) adjoining the sealing surface (12), wherein the sealing frame (03) has a convergent portion (21) which engages at least partially in the blind hole and effects a positioning of the sealing element relative to the sealing frame (03).

6. The sliding surface sealing arrangement as claimed in claim 5, characterized in that the blind hole and the constriction (21) are dimensioned relative to one another such that a relative movement of the sealing element relative to the sealing frame (03) up to a maximum stroke is possible by compression of the compression element (17), and furthermore a positioning of the sealing element (02) relative to the sealing frame (03) is also possible.

7. A continuously operating double belt press for producing continuous material webs, such as laminates, in particular copper laminates, decorative laminates, fiber-reinforced plastic laminates and/or other industrial laminates, having a rigid press frame, having a deflection roller which is rotatably mounted on a bearing bridge of the press frame, having an upper and a lower continuous press belt (04) which is guided by the deflection roller, wherein a reaction zone (13) is formed between mutually opposite outer sides of the press belts, in which the material web is guided and pressed under a planar pressure, and having a pressure chamber (08) which at least partially generates the planar pressure and which is formed in the reaction zone (13) between a base element (07), in particular a heating plate, and an inner side (11) of the press belt (04), the reaction zone can be charged with a fluid pressure medium and is laterally delimited and in particular sealed by at least one annular, self-closing sliding-surface sealing device (01), wherein the sliding-surface sealing device (01) has a sealing surface (12) for sealingly bearing against an inner side (11) of the compression band (04) and is mounted movably in the compression direction in a base element (07), wherein the bearing comprises an at least partially elastic movable compression element (10) which, by pressure charging on the base element side, presses the sliding-surface sealing device (01) with the sealing surface (12) in the compression direction against the inner side (11) of the compression band (04),

characterized by having a sliding face seal arrangement (01) according to any one of claims 1 to 7.

8. The double belt press according to claim 7, characterized by two at least sectionally mutually parallel, closed-on-itself, annular sliding-face sealing devices (01) according to one of claims 1 to 7.

Technical Field

The invention relates to a sliding-surface sealing device for a continuously operating double belt press for producing a continuous material web, such as a laminate, in particular a copper laminate, a decorative laminate, a fiber-reinforced plastic laminate and/or other industrial laminates, having an upper and a lower continuous press belt guided by deflection rollers, wherein a reaction zone is formed between the mutually opposite outer sides of the press belts, in which the material web is guided and is pressed under planar pressure; the pressure chamber is designed to generate a planar pressure at least in part, and is arranged in a reaction zone between a base element, in particular a heating plate, and an inner side of the press belt, wherein the reaction zone can be loaded with a fluid pressure medium and is delimited and sealed laterally by at least one annular, self-closing sliding-surface sealing device, wherein the sliding-surface sealing device has a sealing surface for sealingly abutting against the inner side of the press belt, and the sliding-surface sealing device has a sealing element forming the sealing surface and a sealing frame at least partially accommodating the sealing element for movably supporting the sliding-surface sealing device in the base element, in particular the heating plate.

The invention further relates to a continuously operating double belt press according to the invention.

Background

The use of continuously operating double belt presses for pressing a plurality of substrates or a plurality of material webs against one another and of sliding surface sealing devices for sealing pressure chambers between a pressing belt and a base element, in particular a heating element, of a double belt press has long been known and is described, for example, in the documents DE 4128024 a1 and DE 4219226C 2. The self-closing slide face seal here forms, with respect to the direction of rotation or running direction of the press belt, a section extending in the running direction or direction of rotation and, in particular, in the inlet region and outlet region of the press or press belt, a region extending transversely to the direction of rotation or running direction of the press belt.

In the prior art, different problems arise with respect to sliding surface sealing devices. In the inlet and outlet regions of the press, the sections of the sliding-surface sealing device which extend transversely thereto may sometimes exert locally different pressures on the rear side of the press belt or on the inner side of the press belt on the basis of the rigidity of the sealing device and on the basis of manufacturing and installation tolerances, which results in the possibility of defects on the finished product or the material web being manufactured, in particular in sensitive products, which appear in particular as visible longitudinal streaks in the finished product.

A further disadvantage of the known sliding-surface sealing device and of the known continuously operating double belt press is that with the known double belt press and the known sliding-surface sealing device it has hitherto only been possible to achieve that, instead, a web of material with insufficient dimensions is processed and/or pressed when the material is very thin, for example only a few tenths of a millimeter. The specification of the shortfall, which is referred to by the person skilled in the art, means that the width of the material web to be pressed is reduced to a smaller distance than the distance between the longitudinally extending sections of the slide-face seal of the double belt press. The production of an undersized material web is therefore also virtually impossible or problematic until now, since, in particular in the inlet and outlet regions of the press, the transversely extending sections of the sliding-surface sealing device, in view of their rigidity, cannot follow the course, in particular an S-shaped course, of the press belt around the lateral edges of the material web or the press compound, and therefore lead to an unacceptably high leakage of the fluid pressure medium from the pressure chamber. However, the desire for a double belt press, in particular a continuously operating double belt press, which can process or prepare a material web with a small format of the extruded material or material web is particularly great, since otherwise a correspondingly dimensioned double belt press would have to be provided and operated for a correspondingly smaller format, in particular for a correspondingly smaller width of the extruded material or material web, in which the spacing of the sliding face seals in the longitudinal section is adapted to the width of the extruded material or material web. Furthermore, the operation of the twin-belt compressor with the oversize press compound (i.e. with the lateral projection of the press compound or of the material web which exceeds the width of the sliding-surface seal in the longitudinal section) leads to considerable waste, since although leakage of the fluid pressure medium from the pressure chamber is avoided by means of oversizing, since the sliding-surface seal does not have to be adapted to the respective contour, in particular in the inlet and outlet regions, the region of the material web or press compound which is remote from the sliding-surface seal or is guided through the twin-belt press outside the sliding-surface seal is not pressed with sufficient flat pressure and is not subjected to the desired or required temperature profile, and accordingly a corresponding waste must be formed which has to be removed and cleaned from the material web being produced.

Disclosure of Invention

Starting from the prior art, the object of the invention is to propose a sliding-surface sealing device for a continuously operating double belt press and a corresponding double belt press which allow a more flexible use in terms of the width of the material web to be pressed or the press material to be pressed and at the same time enable better working results, in particular higher quality material webs.

This object is achieved in the case of a sliding-surface seal for a continuously operating double belt press by the features of claim 1, in that a compression element is arranged between the sealing frame and the sealing element at least in the pressing direction, said compression element being able to bring about a relative movement of the sealing element relative to the sealing frame by means of an elastic compression, in particular an at least partially elastic compression, in particular as a reaction to a pressure application of the sliding-surface seal in the pressing direction.

In this way, it is achieved in a particularly advantageous manner that the sliding surface seal is locally flexible to a significant extent, so that in particular in the inlet region and the outlet region of the double belt press the sliding surface seal, in particular the sealing surface of the sliding surface seal, can be adapted ideally to the course of the respective press belt, and as a result, on the one hand, a uniform pressure application to the inner side of the press belt can be achieved, and at the same time, an excellent sealing action can be produced even when the double belt press presses material with insufficient dimensions.

The basic idea of the invention is therefore based on the knowledge that a compression element arranged between the sealing element and the sealing frame makes it possible to achieve a flexibility, in particular a local flexibility, of the sealing element, so that, as a reaction to a pressure load on the rear side of the sliding-surface sealing device or starting from the basic element, a generally uniform pressing pressure can be applied to the inner side of the pressing band, and that, furthermore, the compression, which is manifested by locally different compressions of the compression element or locally different courses of the compression element, can better follow the course of the inner side of the pressing band through the sliding-surface sealing device, and a uniform pressing pressure can nevertheless be achieved, which is in particular so great that unfavorable or undesirable leakage of the pressure medium from the pressure chamber cannot be observed.

On the one hand, it is therefore achieved that with the sliding face seal according to the invention, the double belt press can also be operated with undersized pressed material and can produce high-quality results.

According to an advantageous first embodiment of the sliding surface sealing device, it can be provided that the compression element is designed as an O-ring which closes on itself. This design of the compression element is considered to be particularly advantageous with regard to local flexibility of the sealing element relative to the sealing frame and with regard to uniform pressure loading on the inside of the compression band. As an alternative to a closed O-ring, a looped rope arranged in a loop or an inserted non-closed sealing strip with a circular cross-section can also be used. The latter mentioned configuration is advantageous to take into account or compensate for the thermal expansion of the compression element.

With regard to the arrangement of the compression element, it should be ensured, on the one hand, that a desired or intended flexibility of the sealing element or of the sealing surface of the sealing element is achieved, but at the same time it should also be ensured that the stability of the sliding-surface sealing arrangement, in particular also the bearing of the sealing element in the sealing frame, is not unduly impaired. This requirement is achieved in a further particularly advantageous embodiment of the sliding-surface sealing device, according to which the sealing frame has a groove for accommodating the sealing element, wherein the compression element is arranged along the groove bottom of the sealing frame. Thus, the compression element is fixed and stabilized as much as possible in two of the three spatial directions. The compression element is thus accommodated and guided in this arrangement by the sealing frame on three of the four circumferential sides and is fixed on the fourth circumferential side by the sealing element or is limited in its movability.

In a further advantageous embodiment, it is provided that the sealing element is made at least partially or partially of a material with a low modulus of elasticity, in particular a polymer or a metal. In this case, it is particularly expedient for the sealing element to be embodied in the region of the inlet region and the outlet region of the double belt press with a corresponding polymer or metal substance. In this region, therefore, the flexibility, in particular the local or point-shaped flexibility of the sealing elements, of the sliding surface sealing arrangement, which reflects the inventive concept, is important for pressing an undersized material web and for producing a high-quality pressed material. The sealing element can accordingly be designed such that the polymer is used selectively in the region of the sealing element which forms a section of the sealing element which extends transversely to the direction of rotation or running direction of the press belt. However, a sealing element which is generally made of a polymer with a low modulus of elasticity can also achieve the advantages described above.

The sliding surface sealing arrangement according to the invention is embodied with a compression element arranged between the sealing element and the sealing frame, which is challenging with regard to the fixing or positioning of the sealing element relative to the sealing frame. This relates in particular to the sections or regions of the sliding surface sealing device which are arranged in the direction of travel or direction of rotation of the pressing belt. In other words, this means that the sealing element is subjected to a great thrust outside the inlet and outlet regions of the press by the movement of the press belt, in particular when taking into account that the sealing surface of the sliding-surface sealing arrangement is at most 200bar or 20N/mm depending on the magnitude of the corresponding pressure in the pressure chamber, for example ²Is pressed against the inner side of the pressing belt. Since, for example, dry friction or incrustation between the press belt and the sealing element can occur, there is in principle the risk that the sealing element is carried along or displaced by the press belt in the direction of rotation or direction of travel of the press, and the sliding-surface sealing device thereby at least becomes unsealed or even damaged.

In order to overcome problems with regard to positioning or fastening of the sealing element, a further particularly preferred embodiment of the sliding-surface sealing arrangement provides that the sealing element has a blind hole or a milled-out portion at least in places on the side surface adjoining the sealing surface, wherein the sealing frame has a constriction (Verstemmung) which engages at least partially in the blind hole and effects the positioning of the sealing element relative to the sealing frame. The blind hole or the milled-out portion and the correspondingly provided convergence of the sealing frame ensure that the thrust forces exerted by the pressure strip on the sealing surface and therefore on the sealing element can be reliably introduced into the substructure, in particular the correspondingly solid and stable sealing frame, without the risk of damaging or displacing the sealing element. The milled section can preferably be used in a sealing element made of metal, in particular bronze. The constriction can be configured, for example, as a punctiform constriction which is arranged on the upper end of the lateral edge of the sealing frame, so that the sealing frame is deformed at least punctiform in the region of the blind hole, so that in the region where the constriction occurs, the material of the sealing frame at least partially penetrates into the blind hole of the sealing element.

In this case, according to a particularly advantageous embodiment, it is provided that the blind hole and the constriction are dimensioned relative to one another such that a relative movement of the sealing element relative to the sealing frame up to a maximum stroke is possible by compression of the compression element and, in addition, a positioning of the sealing element relative to the sealing frame is possible. In addition to the maximum stroke of the sealing element, which is specified perpendicular to the sealing surface or in the pressing direction, the dimensions of the blind hole and of the convergence in the longitudinal direction, in particular in the circumferential direction of the sealing element, can be designed such that no or only a minimum relative movement between the sealing element and the sealing frame is permitted. Accordingly, it can be provided, for example, that the blind hole is in the form of an elongated hole extending laterally in the pressing direction, wherein the width of the elongated hole is precisely selected such that it is substantially filled or approximately filled by the material of the sealing frame that deforms in the region of the convergence, and conversely the length of the elongated hole is precisely selected such that a corresponding maximum stroke of the sealing element in the pressing direction is possible in reaction to the deformation of the compression element.

In the context of a continuously operating double belt press according to the invention, the technical problem already mentioned above is solved by a double belt press for producing a continuous material web, such as a laminate, in particular a copper laminate, a decorative laminate, a fiber-reinforced plastic laminate and/or other industrial laminates, having a rigid press frame, a deflection roller which is rotatably mounted on a bearing bridge of the press frame, an upper and a lower continuous press belt which is guided by the deflection roller, wherein a reaction zone is formed between mutually opposite outer sides of the press belt, in which the material web is guided, and the material web is pressed under a plane pressure, wherein the double belt press furthermore has a pressure chamber which at least partially generates the plane pressure and which is formed in the reaction zone between a base element, in particular a heating plate, and the inner side of the press belt, the reaction zone can be charged with a fluid pressure medium and is laterally delimited and in particular sealed by at least one annular, self-closing slide-surface sealing device, wherein the slide-surface sealing device has a sealing surface for sealingly abutting against the inner side of the press belt and is mounted movably in the pressing direction in the base element, wherein the bearing comprises an at least partially elastic movable pressing element which, by pressure loading on the base element side, presses the slide-surface sealing device with the sealing surface in the pressing direction against the inner side of the press belt, and the double belt press is characterized in that the sealing device is designed according to one of the preceding embodiments, i.e. it has, next to the sealing element and the sealing frame, at least one compression element which is arranged in the pressing direction between the sealing element and the sealing frame.

As already explained above, with the double belt press according to the invention advantages are achieved in terms of pressing of pressed material with insufficient specifications, as well as in terms of the quality of the material web being produced. With regard to the advantageous embodiments and the accompanying preferred modes of action, reference is made to the above-described embodiments with regard to the sliding-surface sealing arrangement.

In addition, according to an advantageous embodiment of the double belt press, it is provided that the double belt press has at least two partially mutually parallel, closed-on-self, annular sliding-surface sealing devices according to one of the above-described embodiments. This can further reduce leakage or, if desired, suck away pressure medium which has leaked from the pressure chamber into the gap between the first and second sliding-face seal via the first sliding-face seal via a negative pressure in the gap.

Drawings

The following description of the schematic drawing shows an advantageous embodiment of the invention. Wherein:

fig. 1 shows a sectional view along a sliding-face sealing arrangement in the entry region of a double belt press according to the prior art;

fig. 2 shows a schematic view of a section through a double belt press in the region of a sliding-face seal according to the prior art;

fig. 3 shows a schematic top view from the viewing direction of the basic element according to the prior art towards the inside of a double belt press;

fig. 4 shows a schematic section of a cross-sectional view of a double belt press in the region of a sliding-surface sealing device according to the invention;

FIG. 5a shows a schematic view of a fragment of a side view of a sliding face seal arrangement according to an embodiment of the invention;

fig. 5b shows a schematic cross-sectional view through the sectional plane AA of the illustration of fig. 5 a; and

fig. 6 shows a longitudinal section through a sliding-surface sealing arrangement in the entry region of a double belt press according to the invention.

Identical elements or elements having the same function are provided with the same reference numerals throughout the figures.

Detailed Description

Fig. 1 shows the upper and lower sliding-surface sealing arrangements 01 in the inlet region of a double belt press, which is not shown in the illustration of fig. 1. The sliding surface sealing arrangement 01 comprises a sealing element 02 and a sealing frame 03, wherein the sealing frame 03 is accommodated in a known manner by a base element, in particular a heating plate, and is mounted movably in the base element. For the sake of simplicity, these basic elements are likewise not shown in the illustration of fig. 1. Between the sliding surface seal 01, the basic elements not shown in fig. 1, and the press belt 04 of the double belt press, a pressure chamber is formed, which is charged with a fluid pressure medium in order to press the press belt 04 against the press material 05.

In the illustration in fig. 1, the direction of rotation or the direction of travel of the pressing belt 04 in the illustrated section of fig. 1 extends, for example, within the plane of the drawing and, in the region extending above or below the illustrated segment, respectively, extends outward from the plane of the drawing in fig. 1. In the exemplary illustration in fig. 1, the extrusion material 05 has a smaller width than the width of the sliding surface seal in the entry region, or the extrusion material 05 has a smaller width than the spacing of the sliding surface seal in the longitudinal direction of the double belt press or in the direction of rotation of the extrusion belt of the double belt press. As shown in fig. 1, the corresponding lack of specification of the press compound 05 results in that, in view of the lack or insufficient flexibility of the conventional or known sliding-surface sealing arrangement 01 between the sliding-surface sealing arrangement 01 and the press belt 04, in particular between the sealing element 02 and the press belt 04, a leakage gap 06 is formed in the region where no press compound 05 is present or is not present, which leakage gap leads to an excessive and undesirable loss of pressure medium from the pressure chamber. Accordingly, only when the thickness of the extrusion material is only a few tenths of a millimeter, extrusion material 05 with an insufficient specification can be extruded with a double belt press and sliding-face sealing device 01 according to the prior art as shown in fig. 1 and a corresponding material web can be produced.

Furthermore, the known sliding-surface sealing device, as is also explained in more detail in fig. 2, has the disadvantage that, in particular, an uneven pressing action or an uneven pressing pressure acting on the pressing belt 04 occurs in the inlet region and in the outlet region of the double belt press, which can lead to visible streaks in the material web being produced.

Fig. 2 shows a section of a cross-sectional view of a double belt press according to the prior art. The double-belt press here comprises two sliding-surface sealing arrangements 01, which extend parallel to one another and likewise have sealing elements 02 and a sealing frame 03 for receiving the sealing elements 02. Different pressure spaces are formed between the press belt 04 and the base element 07 by means of the sliding surface seal 01. In one aspect, a pressure chamber 08, which can be charged with a fluid pressure medium, is formed in the first or inner sliding surface seal 01. In the known double belt press, the pressure chamber 08 can preferably be pressurized with a pressure of at most 80 bar. Between the first or inner sliding-surface sealing device 01 and the second or outer sliding-surface sealing device 01, a vacuum space 09 is formed, which can be acted upon by a vacuum, for example, in order to suck off or discharge pressure medium leaking out of the pressure chamber. The sliding surface sealing device 01 is mounted movably in the base element 07 by the sealing frame 03 being guided movably in a recess of the base element 07. In particular, the sealing action of the sealing element 01 against the pressure belt 04 is achieved in that the sliding surface sealing device 01 is pressurized on the base element side. In the example of fig. 2, it can be provided, for example, that a pressing element 10 (which can be embodied, for example, as an elastic O-ring made of FKM and/or FFKM material) which is also movably mounted in the base element 07 is acted upon on the base element side with pressure, so that the pressure is transmitted via the pressing element 10 to the sliding-surface sealing device 01, in particular to the sealing frame 03 of the sliding-surface sealing device 01, so that the sealing element 02 connected to the sealing frame 03 is itself pressed against the inner side 11 of the pressing strip 04 by the pressure. Accordingly, the sealing element 02 forms a sealing surface 12 in the contact region with the inner side 11 of the press belt 04.

Between the pressure chambers 08 and delimited by the inner sliding surface seals 01, between the press belts 04, in particular between the opposite outer sides of the press belts 04, a reaction zone 13 is formed, in which a material web is produced from the press material 05. As illustrated in fig. 2, the extrusion material 05 with an out-of-specification must be produced or moved in order to prevent the formation of a leakage gap 06, as illustrated in fig. 1, when the extrusion material with an out-of-specification is guided through the double belt press. This means that the extrusion material 05 must have a width which, in the lateral or longitudinal region of the double belt press and sliding-surface sealing device 01, projects at least beyond the reaction zone and therefore at least beyond the inner sliding-surface sealing device 01.

Fig. 3 shows a schematic plan view of the heating plate or base element 07, not shown in fig. 3, toward the inner side 11 of the press belt. The illustration of fig. 1 is obtained, for example, from region II along section BB. The illustration of fig. 2 is obtained, for example, from region III along section CC. Accordingly, on the left side of the inner side 11 of the press belt 04 there is an inlet region 14 to the double belt press and in the right side region there is an outlet region 15 of the double belt press. Fig. 3 likewise shows an inner sliding-surface sealing device 01 and an outer sliding-surface sealing device 01, each of which is of annular and closed design, wherein at least the inner sliding-surface sealing device 01 is delimited laterally, i.e., at right angles to the drawing plane of fig. 3, and also seals the reaction zone 13 as far as possible.

Fig. 4 shows a section through a sectional view of a double belt press according to the invention, comprising two sliding-face sealing arrangements 01 according to the invention. The representation of fig. 4 substantially corresponds to the representation of fig. 2. The same elements of the sliding surface sealing arrangement 01 and the double belt press are provided with the same reference numerals and are described. As already described in fig. 2, the sliding surface sealing arrangement 01 is also mounted movably in the base element 07 by means of the recess 16, wherein the pressure on the base element side is transmitted by means of the pressing element 10 to the sliding surface sealing arrangement 01, in particular to the sealing frame 03, so that finally the sealing surface 12 of the sealing element 02 is pressed against the inner side 11 of the pressing strip 04.

Unlike the embodiment of the sliding surface sealing arrangement 01 according to the prior art, as reflected in the representation in fig. 2, the sliding surface sealing arrangement 01 according to the invention comprises a compression element 17, which enables a relative movement of the sealing element 02 relative to the sealing frame 03, in particular as a reaction to a pressure loading of the sliding surface sealing arrangement 01 in the pressing direction a, wherein the compression element 17 undergoes or implements an elastic compression in order to enable a relative movement between the sealing element 02 and the sealing frame 03. The compression element 17 is arranged in a groove 18 of the sealing frame 03. In particular, the compression element 17 is arranged along a groove bottom 19 of the groove 18 of the sealing frame 03. Accordingly, the groove 18 with the groove bottom 19 serves not only for at least partially receiving and guiding the sealing element 02, but at the same time for receiving and guiding the compression element 17. In a manner that is important for the invention, it is achieved by the compression element 17 that the pressure exerted on the base element 07 side on the recess 16 in the base element is transmitted via the pressing element 10 and the sealing frame 03, via the compression element 17 to the sealing element 02 and the sealing surface 12 of the sealing element, so that depending on the resistance of the pressing strip 04, the pressure results in a different degree of compression of the compression element in the groove 18 of the sealing frame 03, so that although on the one hand the pressing pressure of the sealing surface 12 is exerted on the inner side 11 of the pressing strip 04, on the other hand the sealing element 02 is movably carried out relative to the sealing frame 03 over at least a certain stroke, which is determined by the compressibility and deformability of the compression element 17, so that the sliding surface sealing device 01 is overall flexible, in particular locally flexible, so that a uniform pressure can be exerted via the sealing surface on the inner side 11 of the pressing strip 04, and furthermore ensures adjustability and extrusion behavior in accordance with local profile changes of the extrusion band 04, in particular of the inner side 11 of the extrusion band. The compression element 17 is preferably embodied as a self-closing O-ring made of a material which can withstand the operating temperatures of the double belt press and the temperatures prevailing at the location of the sliding-surface sealing device and at the same time can perform the desired function as an elastic compression element.

Fig. 5a shows a sectional side view of a sliding surface sealing device according to the invention according to a preferred embodiment. On the one hand, the sealing frame 03 and the sealing element 02 at least partially accommodated by the sealing frame 03 can be seen in a side view. The sealing element 02 has a sealing surface 12, which is arranged above in the side view of fig. 5 a. In the upper section of the sealing frame 03, a constriction, which is embodied, for example, as a circular or point-shaped constriction and is arranged in the upper region of the side wall 20 of the sealing frame 03, is shown in fig. 5a, so that the material pressed out by the constriction 21 in the direction of the interior of the sealing frame 03 engages in the blind hole 22 and thus a positioning and/or fastening of the sealing element 02 relative to the sealing frame 03 can be achieved.

As is already shown in fig. 5a, the blind hole 22, which is also arranged in the side 23 of the sealing element 02, is dimensioned to a greater extent than the material or deformation section which projects into the interior of the groove 18 of the sealing frame 03 in the region of the constriction. The dimensioning of the blind hole 22 relative to the constriction 21 is designed to ensure that the relative movement of the sealing frame relative to the sealing element 02, which can be achieved in particular by the compression element 17 according to the invention, is not eliminated or is limited to an excessive extent by the constriction of the sealing frame 03 relative to the sealing element 02. The constriction 21 and the blind hole 22 are dimensioned accordingly such that a relative movement of the sealing element 02 relative to the sealing frame 03 up to a maximum stroke can be achieved, in particular, by compression of the compression element 17, and furthermore the positioning of the sealing element 02 relative to the sealing frame 03. This means in particular that, in a longitudinal region 24 of the sliding-surface sealing device 01, which is shown, for example, in fig. 3, the constriction 21 and the blind hole 22 of the sliding-surface sealing device 01 interact in such a way that a displacement of the sealing element 02 in the longitudinal direction of the groove 18 of the sealing frame 03 is prevented in the sealing frame 03. Accordingly, as already mentioned above, the convergence can be designed in a point-like manner or a corresponding circular projection or bead on the side of the groove 18, wherein the blind hole 22 is, for example, designed as an elongated hole, so that the convergence prevents a movement or displacement of the sealing element 02 in the longitudinal direction of the groove 18, whereas the convergence 21 enables a vertical movement of the sealing element in the pressing direction, i.e. relative to the groove bottom 19 of the groove 18.

The corresponding design of the blind hole 22 and the constriction 21 in the side wall 20 of the sealing frame 03 is likewise visible in the sectional view of fig. 5b, which shows a section along the plane AA of fig. 5 a.

By means of the compression element 17 according to the invention for flexibilizing the sealing element of the sliding-surface sealing device, a pressing situation and a sealing situation occur in particular in the inlet and outlet regions of the double belt press, i.e. in the region in which the press compound 05 extends and is guided perpendicularly to the direction of rotation of the double belt press, as is shown by way of example in the section schematically illustrated in fig. 6. The segment of the sectional view of fig. 6 can likewise be taken, for example, from the region II of fig. 3 and extends along the axis B. As already shown in fig. 1, the two press belts 04 of the double belt press and the sliding-surface sealing device 01 which bears against or presses against the inner side 11 of the press belts on the press belts 04 are shown. In the example of fig. 6, the extrusion material 05 with an insufficient size should also be introduced into the double belt press, so that the extrusion material 05 does not extend over the entire width of the extrusion belt 04, but ends in particular in the width of the reaction zone 13, which is formed by the longitudinal section of the sliding-surface sealing device 01 and the distance between the sliding-surface sealing devices. However, since the compression element 17, which is not shown in the sectional view of fig. 6, is arranged between the respective sealing element 02 of the sliding-surface sealing arrangement 01 and the sealing frame 03 of the sliding-surface sealing arrangement 01, and a relative movement of the sealing element 02 relative to the sealing frame 03 is possible, a flexibility of the sealing element 02 is achieved, which enables the sealing element 02 to be better adapted to the course of the compression band 04 by the compression pressure applied to the sliding-surface sealing arrangement 01 in the compression direction a, or conversely, the compression pressure of the sealing surface 12 on the inner side 11 of the compression band 04 in combination with the compression element 17, which is not shown, enables a better simulation of an uneven surface or an uneven course of the compression band, in particular of the inner side 11 of the compression band 04, and at the same time a more uniform pressure can be applied to the inner side 11 of the compression band 04. As shown in fig. 6, in particular in comparison with fig. 1, it is thus possible to avoid the leakage gap 06 formed in fig. 1 by variably adapting the sealing element 02 to the course of the press belt 04, so that, on the one hand, the double belt press can be operated with an undersized press material and, on the other hand, a uniform pressing pressure is applied from the sliding surface seal 01 to the inner side 11 of the press belt 04.

The sectional or partial possibility of relative movement and relative movement of the sealing element 02 relative to the sealing frame 03, which is achieved by the provision of the compression element 17, is also clearly visible or shown in fig. 6, since the sealing element 02 projects to a different extent from the sealing frame 03 in different regions of the inlet region of the belt press over the illustrated width of fig. 6, which is achieved or achieved by a more partial or partially different compression of the compression element 17.

List of reference numerals

01 sliding surface sealing device

02 sealing element

03 sealing frame

04 extrusion band

05 extruding the material

06 leakage gap

07 basic element

08 pressure chamber

09 negative pressure space

10 extrusion element

11 inner side

12 sealing surface

13 reaction zone

14 inlet area

15 outlet area

16 concave part

17 compression element

18 groove

19 groove bottom

20 side wall

21 convergence part

22 blind hole

23 side surface