Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B30—PRESSES
  • B30B—PRESSES IN GENERAL
  • B30B5/00—Presses characterised by the use of pressing means other than those mentioned in the preceding groups
  • B30B5/04—Presses characterised by the use of pressing means other than those mentioned in the preceding groups wherein the pressing means is in the form of an endless band
  • B30B5/06—Presses characterised by the use of pressing means other than those mentioned in the preceding groups wherein the pressing means is in the form of an endless band co-operating with another endless band
  • B30B5/065—Presses characterised by the use of pressing means other than those mentioned in the preceding groups wherein the pressing means is in the form of an endless band co-operating with another endless band using anti-friction means for the pressing band

Definitions

• the invention relates to a pressing device for a double belt press according to the preamble of claim 1.
• Such pressing devices are used for double belt presses in particular in the manufacture and / or coating of single or multi-layer webs made of different materials.
• the double belt presses have a revolving upper press belt and a revolving lower press belt, between which the material to be pressed is taken up, conveyed in the conveying direction and in this case pressed and then discharged.
• the pressing takes place between the lower run of the upper and the upper run of the lower press belt by means of a pressing device which slidably abuts the steel belts and presses them together with a predetermined pressure.
• the pressing device in this case has heating plates which can be pressurized and on which a plurality of covering inserts lying against one another in the transport direction are accommodated, each covering insert having a carrier plate and a sliding covering made of, for example, plastic.
• a lubricant or lubricant is fed to a sliding surface of the sliding covering via feed bores which extend through the heating plate, carrier plate and sliding lining to the sliding surface and are correspondingly removed again via discharge bores.
• the lubricant is generally supplied under pressure, the lubricant being able to be distributed transversely over the entire pressing surface or sliding surface via the feed bores and grooves formed on the sliding surfaces, and the material is thereby subjected to relatively uniform pressing conditions.
• the lubricant is removed on the one hand via the discharge bores, which extend corresponding to the feed bores, and on the other hand via lateral edges of the sliding surfaces or pressing surfaces. The removed lubricant is returned to the lubricant circuit.
• the lubricant - generally oil - between the sliding surface and the steel strip Due to the even distribution of the lubricant - generally oil - between the sliding surface and the steel strip, direct contact of these components can be largely avoided, so that a low coefficient of friction and wear is achieved.
• a uniform distribution is important here in order to obtain a uniform pressure and a uniform temperature during the transport of the material between the pressing surfaces and thus a homogeneous starting material.
• the pressure of the lubricant is in the immediate vicinity of the atmospheric pressure of the surrounding atmosphere and the lubricant emerging from the side. Accordingly, it is difficult to maintain the even pressure in the lubricant even in the lateral edge areas.
• EP 0 491 972 A1 shows a pressing device for a double belt press, in which grooves extending in the transverse direction are formed in the sliding surface of the sliding lining in order to swirl the sliding medium, in particular in the outer regions.
• the uniformity that can be achieved in this way is not sufficient when processing certain materials, so that the use of such presses is limited and their economic efficiency is considerably impaired, and in particular materials that require a uniform compression over their transverse extent must therefore generally be processed in other pressing devices that do not allow continuous feeding and pressing.
• DE 197 30 152 A1 shows a double belt press of the type mentioned at the outset.
• Different grooves and blind grooves are formed in the sliding surfaces, grooves formed in main areas in the feed area. and discharge openings for the lubricant, grooves formed in outside areas for swirling, for reducing pressure and for collecting lubricant emerging laterally from a pressing area, and blind grooves are formed in transition areas arranged between the main areas and outside areas.
• DE 44 14 957 C2 shows a double belt press with a pressing device, in the sliding surface of which grooves are greased, some of the grooves being supplied with lubricant, which forms a sliding film on the sliding surface, and this lubricant is removed again via other grooves.
• the invention has for its object to provide improvements over conventional pressing devices for double belt presses and in particular to provide a pressing device for a double belt press and a double belt press with such a pressing device, which allow uniform pressing conditions, in particular over their transverse extension, with continuous material supply. This should advantageously be possible with relatively little effort, in particular little additional equipment.
• the invention is based on the finding that irregularities in the flow of lubricant on the sliding surfaces are essentially caused by leakage of lubricant between the pressure-transmitting elements.
• a not insignificant proportion of the lubricant flows between the heating plate and the support plate as well as the support plate and sliding linings and between the sliding linings, which leads to uneven pressure distribution and pressure medium supply and discharge on the sliding surfaces.
• Such leaks occur in particular due to the different coefficients of thermal expansion of the Plastic materials of the sliding linings and the metal parts as well as the high temperature differences between idle state and various operating states.
• Suitable measures to increase the flow resistance between the pressure-transmitting elements can significantly improve the contact conditions between the sliding surfaces and metal strips.
• Both additional seals and grooves in the surfaces of the components in the relevant gaps can be provided as flow resistance increasing means. Additional sealing elements directly block or hinder leakage of the lubricant through the space in question.
• the grooves or surface profiles increase the flow resistance in particular through local turbulence; furthermore, a lateral removal of the lubricant can be achieved at the relevant points.
• lubricant Leakages of the lubricant can already occur when the lubricant is fed through the heating plate, carrier plate and the sliding coating onto the sliding surface. Furthermore, lubricant can flow between the individual sliding linings and, for example, form a flow between the sliding linings and the carrier plate or between the carrier plate and the heating plate.
• Local turbulence which leads to a significant increase in flow resistance, can be achieved in particular by a large number of grooves or swirling grooves arranged on a two-dimensional surface, the groove beginning and end of which lie on the surface in question.
• grooves and ring grooves extending in the transverse direction, in particular over the entire width of the surface in question, can be provided, it being possible for an appropriate seal to be inserted into the transverse grooves and ring grooves.
• surface profiles or Grooves to reduce leakage through these seals can be provided.
• Strips provided on the front or top of the heating plate for receiving the covering inserts consisting of carrier plate and sliding covering can be formed at least in places - for example in lateral strip areas - by sealing elements made of, for example, plastic or another elastic material.
• atmospheric pressure can also advantageously be passed between the carrier plate and the sliding lining by, for. B. with one, several or all support plates as flow resistance increasing means from the side transverse grooves on the underside of the support plates and pass into vertical holes through the support plates.
• the lubricant flow in this area is effectively impaired by the atmospheric pressure;
• the connection is advantageously dimensioned in such a way that oil penetration is low. If necessary, escaping oil can be collected.
• the flow of the lubricant and the lubricant conditions on the sliding surface can thus be equalized in a surprisingly simple manner by preventing or impairing or obstructing lubricant leakages and a lubricant flow below the sliding surface, as a result of which uniform ambient conditions are achieved during the pressing process.
• the uniformity of the supply of the lubricant can in particular prevent local wear of the sliding linings in areas with poor lubrication, which leads to the non-uniformity of the processed material.
• the sliding linings that are subject to wear can be replaced in a simple manner by a form-fitting receptacle, in particular a dovetail guide for the sliding linings on the carrier plates.
• the dovetail guide is in this case formed at one end by a corresponding engagement behind the support plate and another, for example rear or front end, by an end strip with a corresponding engagement, the end strip being fastened to the support strip, for example by a screw connection.
• Fig. 1 is a side view of a double belt press with a
• 2a shows a plan view of the sliding surfaces of a plurality of sliding linings lying against one another of the pressing device according to the invention
• Fig. 2b shows a section A-A of Fig. 2a
• 3a shows a partially broken representation of a corner region of a covering insert and a corresponding upper side region of the heating plate for receiving the covering insert
• 3b is a plan view of the top of a heating plate
• FIG. 4 shows a perspective view of an alternative embodiment to FIG. 3a
• FIG. 5 shows a perspective, partially broken view of two adjoining covering inserts according to a further embodiment of the invention.
• 6a is a bottom view of a carrier plate
• Fig. 6b shows a section B-B of Fig. 6a
• FIG. 7a shows a bottom view of a carrier plate according to a further embodiment of the invention.
• FIG. 7b shows a section C-C from FIG. 7a
• FIG. 7c shows a section DD from FIG. 7a; 8a shows a bottom view of a carrier plate according to a further embodiment of the invention;
• FIG. 8b shows a section E-E from FIG. 8a
• FIG. 8c shows a section F-F from FIG. 8a
• FIG. 9 shows a perspective view of a carrier plate according to a further embodiment of the invention.
• Fig. 10 is a plan view of sliding linings according to another
• a double belt press 33 has an upper inlet drum 1a and an upper outlet drum 2a, between which a rotating upper steel belt 3a is stretched.
• a lower steel belt 3b is tensioned between a lower inlet drum 1b rotating in the opposite direction to the upper inlet drum 1a and a lower outlet drum 2b.
• input material is fed between the inlet drums 1a, 1b and is picked up, conveyed and pressed between a lower run of the upper steel belt 3a and an upper run of the lower steel belt 3b, whereupon it is fed between the outlet drums 2a, 2b in the conveying direction F is output.
• a material can be produced and / or coated, single-layer or multi-layer sheets made from particulate starting material, from film material to be unwound, from a single or multi-layer resin-impregnated paper sheet, glass fabric sheet, glass fiber mat, metal foil or metal tape, or another suitable material become.
• the pressing between the steel strips 3a, 3b takes place by means of a pressing device 6, which consists of an upper and a lower half, which are each composed of pressure-transmitting elements. These pressure-transmitting elements are each an upper and a lower heating plate 4a, 4b and on the heating plates 4a, 4b. mene covering inserts 5a, 5b, each of which has a metal carrier plate 7, a sliding covering 8 and an end strip 10 as elements according to FIG. 2b.
• a pressing device 6 For simplification, only the design of the lower half of the pressing device 6 is shown below.
• a plurality of topping inserts 5 are arranged adjacent to one another in the conveying direction F on the heating plate 4. They can be removed, replaced and reinserted individually.
• Oil is used as a lubricant through feed holes (not shown) in the
• Heating plate 4 and feed holes 17 in the carrier plate 7 and the sliding coating 8 are fed to the sliding surfaces 34 in order to form a thin lubricant film between the sliding surfaces 34 and the circumferential steel strips 3.
• the lubricant is discharged, among other things, via discharge bores 18 shown in FIG. 2a, which are designed corresponding to the feed bores 17.
• the metal carrier plates 7 lie with their underside 23 on a e.g. Top side 28 of the heating plate 4 shown in FIG. 3.
• the support plates 7 are delimited and received via strips 24 and strip areas 26, 27 which extend in the transverse direction.
• An intermediate space 19 is formed between an upper side 14 of the metal carrier plate 7 and an underside 38 of the sliding coating 8. Since the metal carrier plate 7 is made of metal and the slide coating is made of plastic, which show different thermal expansion behavior, the size of the gap depends on the respective operating conditions, in particular the temperature and temperature gradient.
• the sliding linings 8 are positively received by means of a dovetail guide 11, the projections 44 of the sliding lining 8 shown in FIG. 3a and the rear engages 42 of the carrier plate 7 receiving them at one end of the sliding lining 8 and an end strip 10 with an upper projection is formed on the other end, preferably the rear end of the sliding coating 8 in the conveying direction F.
• the bottom strip 10 lies here with its lower end in a corresponding gradation of the carrier plate 7.
• the fixing strips 10 are attached to the metal carrier plate 7 by means of, for example, screws 9 from the underside of the metal carrier plate 7.
• the metal carrier plate 7 has O-ring grooves with O-rings 20 for sealing on the upper side 28 of the heating plate 4 around the lubricant supply bore 17 - correspondingly also around the lubricant discharge bore 18.
• the sliding surface 34 has feed and discharge grooves 13 extending diagonally to the conveying direction F, the feed bores 17 and discharge bores 18 being provided in alternating successive grooves 13 and with a lateral offset to one another. As a result, the lubricant film between the grooves 13 is evened out. Gaps 19 are formed between the plastic sliding linings 8, which absorb tolerances due to the thermal behavior of the plastic of the sliding linings 18.
• the carrier plates 7 have cutouts 22 which, according to FIG. 3a, are applied to the strips 24 or strip regions 27, 26 which extend in the transverse direction, thereby preventing the lining inserts 5 from slipping in the conveying direction F.
• the strips 24 and strip areas 26, 27 have surfaces 39 on three sides.
• FIG. 4 shows the corresponding use of the covering inserts 5 in the strip areas 26, 27.
• grooves 35 are formed in the surface 39 of the strip areas 26, the outer strip areas 27 being in this embodiment as sealing elements made of, for example, plastic for sealing the Lubricant film between the heating plate 4 and the support plate 7 are used.
• the grooves 35 shown in FIG. 4 in the strip area 26 can correspondingly also be formed in the strip 24 in FIG. 3.
• the grooves 35 here advantageously extend in the conveying direction F. A corresponding description of the grooves 35 is given below in further embodiments. 5, in the end faces 12, 21 of adjacent sliding linings 8, a spring 48 extending transversely and a groove 50 are provided for mutual engagement, whereby a sealing labyrinth is formed.
• grooves 35 are formed on the underside 23 of the metal carrier plate 7.
• the grooves can advantageously extend over the entire two-dimensional surface of the underside 23, sealing areas around the bores 17, 18 being excluded, in that at least the surface within the O-rings 20 is free of such grooves 35.
• the grooves 35 can be straight, preferably directed in the conveying direction F, curved, intersecting or not intersecting, the maximum extent of the groove-free zones between individual grooves 35 being a maximum of 5 mm and, for example, 3 mm.
• the groove depth is advantageously at least 0.5 mm, the length is 10 mm; The beginning and end of the groove lie within the relevant surface.
• grooves 37 with seals 139 extending in the transverse direction are inserted in the undersides 23 of the metal carrier plates 7, as can be seen in the sectional view in FIG. 7c.
• a circumferential O-ring groove 52 with an inserted O-ring 54 is provided in the underside 23 of the metal carrier plate 7, the surface area within the O-ring groove 52 being free from swirling grooves 35.
• the O-ring groove 52 encloses the O-rings 20 around the feed bores 17 and discharge bores 18, so that oil entering or leaving the bores exits from the space below the underside 23 of the metal carrier plate 7 and the O- top 28 of the heating plate 4 is prevented.
• oil discharge grooves 56 are provided in the metal support plate 7, in which oil can escape laterally from the top 14 via, for example, diagonally extending feed grooves 58, where it is collected again and supplied to the oil medium circuit. leads.
• a connection of the intermediate space 19 between the upper side 14 of the carrier plate 7 and the lower side 38 of the received sliding covering 8 with an outer space 64 is provided.
• This configuration can in principle be provided optionally in all embodiments, wherein the vertical bores according to FIG. 9 can merge into the oil discharge grooves 56 on the top 14 or can also end on the top 14 outside of the oil discharge grooves 56. As a result, atmospheric pressure is entered into the intermediate space 19, which effectively reduces the oil flow.
• the sliding linings 8 have larger central lining elements 70 and smaller side elements 72 arranged laterally to them, the side elements 72 being offset in the conveying direction F from the lining elements 70.
• the sliding linings are each made up of three parts from the elements 72, 70, 72.
• transverse gaps 74 between the central covering elements 70 are offset to transverse gaps 76 between the side elements 72, ie only over Longitudinal gaps 77 connected between the covering elements 70 and the side elements 72.
• the flow resistance of the oil flowing in the transverse gaps between the sliding linings 8 is increased by the angled course of the gaps 74, 77, 76.
• the side elements 72 are advantageously displaceable on the carrier plates 8 in the conveying direction F relative to the covering elements 70.
• a longitudinal guide in the conveying direction F z. B. a dovetail guide corresponding to the transverse guide 42, 44 shown in Fig. 3a, may be provided.
• the side elements 72 are thus displaced in the longitudinal direction at the longitudinal gaps 77.
• a rigid, non-displaceable arrangement of the central covering elements 70 and side elements 72 offset from these is also possible in principle.
• the entire lining inserts 5, i.e. the carrier plates 7 together with covering inserts 8, can be divided into middle elements and side elements displaceable on the heating plates.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Press Drives And Press Lines (AREA)
• Basic Packing Technique (AREA)
• Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Applications Claiming Priority (3)

Publications (2)

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• 2002
  • 2002-03-07 DE DE10209930A patent/DE10209930B4/de not_active Expired - Fee Related
• 2003
  • 2003-03-07 AU AU2003223857A patent/AU2003223857A1/en not_active Abandoned
  • 2003-03-07 WO PCT/DE2003/000804 patent/WO2003074262A1/fr active IP Right Grant
  • 2003-03-07 EP EP03720159A patent/EP1539470B1/fr not_active Expired - Lifetime
  • 2003-03-07 AT AT03720159T patent/ATE359908T1/de not_active IP Right Cessation
  • 2003-03-07 DE DE10390831T patent/DE10390831D2/de not_active Expired - Fee Related
  • 2003-03-07 DE DE50307090T patent/DE50307090D1/de not_active Expired - Lifetime

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