EP0292738B1 - Doppelbandpresse mit erwärm- oder kühlbaren Teilen und Verfahren zu deren Herstellung - Google Patents

Doppelbandpresse mit erwärm- oder kühlbaren Teilen und Verfahren zu deren Herstellung Download PDF

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Publication number
EP0292738B1
EP0292738B1 EP88107044A EP88107044A EP0292738B1 EP 0292738 B1 EP0292738 B1 EP 0292738B1 EP 88107044 A EP88107044 A EP 88107044A EP 88107044 A EP88107044 A EP 88107044A EP 0292738 B1 EP0292738 B1 EP 0292738B1
Authority
EP
European Patent Office
Prior art keywords
solder
double
bore
belt press
wall
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP88107044A
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German (de)
English (en)
French (fr)
Other versions
EP0292738A2 (de
EP0292738A3 (en
Inventor
Kurt Held
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Individual
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Individual
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Filing date
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Publication of EP0292738A2 publication Critical patent/EP0292738A2/de
Publication of EP0292738A3 publication Critical patent/EP0292738A3/de
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Publication of EP0292738B1 publication Critical patent/EP0292738B1/de
Anticipated expiration legal-status Critical
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/06—Platens or press rams
    • B30B15/062—Press plates
    • B30B15/064—Press plates with heating or cooling means
    • 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

Definitions

  • the invention relates to a double belt press or a single or multi-day press with heatable or coolable parts according to the preamble of patent claims 1 or 2 and a method for producing these parts according to the preamble of patent claim 25.
  • Double belt presses are used for the continuous pressing of material webs, which exert a uniform surface pressure on the material to be pressed by means of two superimposed press belts which are arranged over deflection drums, while at the same time the material to be pressed is continuously conveyed through the double belt press (see DE-OS 24 21 296).
  • material webs can consist, for example, of several layers of paper webs stacked on top of one another, soaked with thermosetting or thermoplastic resins, glass fiber fabric webs, laminate webs with metal foil placed on top, fiber binder mixtures, etc. These material webs may require the action of a certain temperature during the pressing in order to harden the binder contained in the material web and to connect the individual layers to form a compact material to be pressed. In the case of thermoplastic binders in particular, it may also be necessary to subsequently cool the material to be pressed in the double belt press under the action of surface pressure.
  • the other surface of the heat-conducting elements touches the inside of the press belts in the area of the reaction zone.
  • the printing plates are heated to a higher temperature than the target temperature of the reaction zone, so that a heat gradient arises between the printing plates and the press belts and a heat flow flows from the pressure plates via the heat-conducting elements onto the press belt. This additional heat is then transferred from the press belts to the material to be pressed. With such an arrangement, cooling of the press belts is also possible by cooling the pressure plate.
  • a fluid for example, is a liquid such as thermal oil or a cooling liquid or a gas or a vapor.
  • heat transfer media that exchange heat with the walls of the channels and that give off heat to the walls of the channels by convection if it is a heated medium, or absorb heat from the walls of the channels by convection if it is a cooled medium, are referred to below as heat transfer media.
  • DE-OS 33 37 913 shows the heating of further parts of the double belt press, for example the press frame, by means of a heat transfer medium circulating through channels in these parts.
  • a heat transfer medium circulating through channels in these parts.
  • DE-OS 33 25 578 it is further known from DE-OS 33 25 578 to introduce axially extending depressions and projections into the walls of the channels, so as to enlarge the surface of the channel inner wall. While Bores with a circular cross section in the heatable or coolable parts of the double belt press are relatively easy to make, such recesses and projections are difficult to manufacture in terms of production technology. Another disadvantage is that the surface enlargement achieved by the projections and depressions is often not sufficient to transfer sufficient heat between the heat transfer medium and the heatable or coolable parts of the double belt press.
  • a double belt press is known from US Pat. No. 4,541,889, in which a laminate guided between the endless belts is heated by means of so-called thermal bridges.
  • the thermal bridges have a sliding contact at one end with the side of an endless belt facing away from the laminate.
  • the thermal bridges are each connected to a heating plate, from which they conduct the heat to the endless belts.
  • the heating plates in turn are heated by a thermal oil which flows through channels contained in the heating plates.
  • the object of the invention is to improve the convective heat transfer between the heat transfer medium flowing in the channels of the heatable or coolable parts of the double belt press or a single or multiple day press and these parts.
  • the advantages achieved by the invention are that sufficient heat can be provided in the reaction zone even in the case of materials which have a greater heat requirement for curing.
  • the cooling of materials in the reaction zone can be carried out at higher cooling rates.
  • the throughput through the double belt press can thus be increased or continuous production of materials is possible which previously could not be produced continuously.
  • the channels realized by the invention in the parts of the double belt press are easy to manufacture. Channels that only consist of simple bores for the heat transfer medium can also be retrofitted with the solution according to the invention.
  • the continuously operating double belt press 15 shown in FIG. 1 has four deflection drums 1, 2, 3, 4 rotatably mounted in bearing bridges 5, 6.
  • an endless press belt 7, 8 is guided around.
  • the press belts 7, 8, which usually consist of a high-tensile steel band, are tensioned using known means, for example hydraulic cylinders 16 fastened in the bearing bridges 5, 6 (see also FIG. 2).
  • the reaction zone 10 Between the lower run of the upper press belt 7 and the upper run of the lower press belt 8 is the reaction zone 10, in which the material web 9 leading from right to left in the drawing is pressed under surface pressure and heat.
  • the material web 9 consists of fabrics impregnated with synthetic resin, laminates, fiber-binder mixtures and the like.
  • a material web 9 can be composed of individual, stacked glass fiber fabric webs, which are impregnated with an epoxy resin, and copper foil webs lying thereon.
  • Such a copper-clad laminate serves as the starting material for the production of printed circuit boards.
  • the surface pressure exerted on the material web 9 in the reaction zone 10 is applied hydraulically or mechanically to the inner sides of the press belts 7, 8 via pressure plates 11, 12 and is then transferred from these to the material web 9.
  • the reaction forces exerted by the material to be pressed are transferred via the pressure plates 11, 12 into the press frame 13, 14, which is only indicated schematically.
  • the bearing bridges 5, 6 are also attached to the press frame 13, 14.
  • stationary rollers 17 are arranged between the pressure plate 12 and the inside of the press belt 8, as shown in FIG. 2 on the lower press belt unit. With the help of hydraulic cylinders 18, the pressure plate 12 and thus also the rollers 17 are set against the inside of the press belt 8.
  • a pressurizable fluid pressure medium is brought into the space between the pressure plate 11 and the inside of the press belt 7, as shown in FIG. 2 with the aid of the upper press belt unit.
  • the so-called pressure chamber 19 is delimited by an annular self-contained sliding surface seal 20 which is attached in the pressure plate 11 and slides on the inside of the press belt 7.
  • a synthetic oil is preferably used as the pressure medium.
  • the pressure plate 11 can also be provided with a mechanical pressure transmission system or the pressure plate 12 with a hydraulic pressure transmission system.
  • the invention is further explained using a double belt press with a hydraulic pressure transmission system.
  • the invention can equally well be used on double belt presses with a mechanical pressure transmission system.
  • FIG. 3 the inlet area 21 of a double belt press is shown in longitudinal section.
  • the inlet-side deflection drums 1 and 4 seen in the feed direction of the press belts 7, 8 are heated.
  • channels 22 are located in the jacket 23 of the cylindrical deflection drums 1 and 4.
  • a heat transfer medium for example a thermal oil, circulates through the channels 22 and emits heat to the deflection drums 1, 4 by convection.
  • the heat of the deflection drums 1, 4 is transferred from them to the press belts 7, 8, which transport the amount of heat absorbed at the deflection drums 1, 4 into the reaction zone 10.
  • the pressure plates 11, 12 are also heated. They have, as can be seen in FIGS. 2 and 3, channels 24 through which a heat transfer medium also flows.
  • the arrangement of the channels 24 can be seen in more detail in FIG. 4, which shows a section along the line 4-4 in FIG. 2. They consist of bores 51 to 56, which extend across the width of the pressure plate 11, 12.
  • Elongated recesses 57 to 61 are provided on the long sides 62, 63 of the pressure plate 11, 12, each of which connects two adjacent bores 51 to 56 in progressive order and alternately on the two long sides 62, 63.
  • the bores 51 and 52 are connected by the recesses 57 on the long side 62 of the pressure plate, the bores 52 and 53 by the recess 58 on the long side 63, then the bores 53 and 54 again on the long side 62 through the recess 59, etc.
  • the recesses 57 to 61 are sealed to the outside of the pressure plate 11, 12 by soldered or welded-in covers 64 (see FIG. 4 or also Fig. 1), so that a system of channels 24 is formed which meanders through the pressure plate 11, 12.
  • the heat transfer medium is supplied via a feed line 65 to the bore 51 and then flows through the channels 24 in the pressure plate 11, 12 in accordance with the arrows shown in FIG. 4.
  • the heat transfer medium emits heat by means of convective heat transfer to the walls of the channels 24 during the flow through the channels 24 and thereby heats the pressure plate 11, 12.
  • heat-conducting elements 25 are arranged in grooves 26, the opening of which faces the inside of the press belt 7, 8, as shown in FIG. 5.
  • the heat-conducting elements 25 rest with a part of their surface facing away from the press belt 7, 8 against the walls of the groove 26, so that they have good thermal contact with the pressure plate 11, 12.
  • the surface of the heat-conducting elements 25 facing the press belt 7, 8 touches the inside of the press belt 7, 8 by grinding. Since the pressure plate 11, 12 is heated to a higher temperature than the target temperature in the reaction zone 10, a heat gradient occurs between the pressure plate 11, 12 and the press belt 7, 8, whereby heat is exerted from the pressure plate 11, 12 via the heat-conducting elements 25 the press belts 7, 8 are transferred in the reaction zone. This heat is conducted from the press belts 7, 8 to the material web 9 lying in the reaction zone 10 on the press belts 7, 8.
  • the more detailed design of the heat-conducting elements 25 is known from DE-OS 33 25 578 and need not be explained in more detail here.
  • such an arrangement is also suitable for cooling the material to be pressed in the reaction zone 10 of a double belt press.
  • the pressure plate 11, 12 is cooled by circulating a cold heat transfer medium through the channels 24.
  • a heat gradient then arises between the material web 9 and the pressure plates 11, 12 in the reaction zone 10.
  • This heat then becomes from the pressure plate 11, 12 taken up by convective heat transfer from the heat transfer medium in the channels 24 and transported away.
  • heatable and coolable printing plates can also be arranged one behind the other in the double belt press, so as to enable the material web to be heated and cooled under pressure in the reaction zone 10.
  • further parts of the double belt press can be provided with channels in which the heat transfer medium circulates for heating or cooling these parts.
  • the press frame or at least parts of it can be heated or cooled if desired.
  • the channels 24, in which the heat transfer medium circulates generally consist of holes with a circular cross section for manufacturing reasons.
  • the heat to be transferred from the heat transfer medium to the printing plate or the heat to be absorbed by the heat transfer medium from the printing plate is insufficient.
  • the material to be pressed is to be heated, in such cases too little heat is transferred to the material to be pressed and this does not fully harden in the double belt press, which ultimately results in a qualitatively inferior end product.
  • the material to be pressed is to be cooled, too little heat is dissipated from it and the material to be pressed leaves the double belt press when it is too warm, which ultimately also results in an inferior quality end product.
  • the amount of heat absorbed or given off by the heat transfer medium circulating in the channels 24 can be significantly increased by providing the channel 24 with a surface-enlarging insert 27 made of a highly thermally conductive material is attached with a surface on the wall of the channel 24 with good thermal contact. This surface has several elements that protrude into the flow of the heat transfer medium.
  • the surface-enlarging insert 27 is made of copper sheet and has an inner hollow cylinder 29 which is arranged in an outer hollow cylinder 28.
  • the outer hollow cylinder 28 has a diameter which is only slightly smaller than the diameter of the bore 51 to 56 for the channel 24, so that the outer hollow cylinder 28 just fits into the bore 51 to 56 and on the wall 33 of the bore 51 to 56 with its outer surface.
  • the inner hollow cylinder 29 has a much smaller diameter than the outer hollow cylinder 28. Both hollow cylinders 28, 29 are arranged so that their cross sections lie on concentric circles.
  • the inner hollow cylinder 29 is connected to the outer hollow cylinder 28 by webs 30 which run radially in the direction of the imaginary center of the concentric circles.
  • the surface-enlarging insert 27 therefore divides the bore 51 to 57 into a round channel segment 32 and a plurality of prismatic channel segments 31 grouped around it. Since the surface-enlarging insert 27 extends over the entire bore 51 to 56 between two recesses 57 and 58 or 59 and 60, the heat transfer medium flowing in the channel 24 is divided by the surface-enlarging insert 27 into several partial flows, which in the round channel segment 32 and the prismatic channel segments 31 flow. Each of these partial flows now emits heat by means of convection to the walls of the channel segments 31, 32 surrounding it or absorbs heat from them.
  • this wall is formed by the inner surface of the inner hollow cylinder 29.
  • the walls are formed by the surfaces of two webs 30, part of the outer lateral surface of the inner hollow cylinder 29 and part of the inner lateral surface of the outer hollow cylinder 28. All of the heat given off by the partial flows to the walls of the channel segments 31, 32 flows by means of heat conduction in the highly heat-conducting material of the surface-enlarging insert 27 in the direction of the outer hollow cylinder 28.
  • the outer lateral surface of the outer hollow cylinder 28 is soldered to the wall 33 of the bore 51 to 56, so that the heat from the outer hollow cylinder 28 via the metallic solder good thermal conductivity flows into the pressure plate 11 and then heated.
  • the surface-enlarging insert 27 can also be clamped in the bore 51 to 56 in such a way that the outer surface of the outer hollow cylinder 28 touches the wall 33 under a contact pressure.
  • a suitable choice of the radius of the outer hollow cylinder 28 ensures that the contact pressure is large enough to ensure good heat transfer between the wall 33 and the outer surface of the outer hollow cylinder 28. The same applies to the cooling of the pressure plate 11, 12 with the reverse direction of the heat flow.
  • the copper profile 34 is a hollow profile with a prismatic shape. Viewed in cross section, the copper profile 34 has an outer curved wall 35, the radius of curvature of which is exactly the same as the radius of the outer hollow cylinder 28, and an inner curved wall 36, the radius of curvature of which corresponds to the radius of the inner hollow cylinder 29.
  • the two walls 35, 36 are connected by two further radial walls 37 which converge at a certain angle in such a way that an essentially triangular shape is formed with a blunted tip.
  • This copper profile 34 is formed from a copper tube using a tool that has this prismatic cross-sectional shape. These copper profiles are then placed next to one another in the bore 51 to 56 such that the outer curved wall 35 bears against the wall 33 of the bore 51 to 56 and the radial walls 37a, 37b of two adjacent copper profiles 34 touch one another over their entire surface.
  • the angles between the walls of the copper profile 34 are selected such that 12 such copper profiles 34 are necessary to completely fill the holes 51 to 56, as can be seen in FIG. 7.
  • a plurality of cylindrical brazing rods 38 are inserted.
  • the pressure plates 11, 12 are placed in a vacuum soldering furnace. In this vacuum soldering furnace, the pressure plate is then heated to the soldering temperature, the solder melts and penetrates between the two radial walls 37a, 37b of two copper profiles 34 lying next to one another. The molten solder is moved further by capillary forces in the direction of the wall 33 of the bore 51 to 56, where it finally penetrates into the gap between the outer curved wall 35 and the wall 33 of the bore 51 to 56.
  • the outer hollow cylinder 28 is produced from the outer curved walls 35, while the inner hollow cylinder 29 is produced from the inner curved walls 36.
  • the webs 30, which connect the outer hollow cylinder 28 to the inner hollow cylinder 29, are formed by brazing two radial walls 37a, 37b which abut one another.
  • the fusion and alloying processes result in an intensive connection between the solder and the base material and thus also a connection between the outer hollow cylinder 28 and the wall 33.
  • the quantity of brazing rods 38 and the time that the soldering process takes are measured so that a safe filling of all soldering gaps is created.
  • soldering in a vacuum oven soldering in a protective gas atmosphere, which consists for example of hydrogen or argon, can also be provided.
  • FIG. 8 Another embodiment for a surface-enlarging insert 39 can be seen in FIG. 8.
  • This surface-enlarging insert 39 divides the bore 51 to 56 into a round channel segment 42, which lies in the center of the bore 51 to 56, and prismatic channel segments 40 and triangular-shaped channel segments 41.
  • the prismatic channel segments 40 and triangular channel segments 41 are alternately arranged along the wall 33 of the bore 51 to 56 so that they form a coherent cylindrical surface 43 which is soldered to the wall 33 of the bore 51 to 56.
  • the cross section of the channel segments 40, 41 can be seen enlarged in FIG. 9.
  • the triangular channel segment 41 has a base side 44, the radius of curvature of which corresponds to the radius of the bore 51 to 56.
  • the two legs 45 of the triangle are approximately the same length.
  • the tips of the triangular channel segment 41 are rounded.
  • the prismatic channel segment 41 has an outer side 46, the radius of curvature of which corresponds to the radius of the bore 51 to 56, and a likewise curved inner side 47, which is concentric with the outer Page 46 is arranged.
  • the two sides 46 and 47 are connected to one another by two side walls 48 which converge at an angle.
  • Both the prismatic channel segment 40 and the triangular channel segment 41 are made from copper tubes by being shaped into a prismatic copper profile 50 or triangular copper profile 49 using a corresponding tool.
  • the production of the surface-enlarging insert 39 proceeds analogously to that of the surface-enlarging insert 27.
  • the triangular copper profiles 49 and prismatic copper profiles 50 are inserted alternately into the bore 51 to 56, that the base side 44 of the copper profile 49 and the outer side 46 of the copper profile 50 bear against the wall 33 of the bore 51 to 56.
  • the required number of cylindrical solder rods are then inserted into the round channel segment 42 and the copper profiles 49, 50 are soldered to the legs 45 along the side walls 48.
  • the base sides 44 and outer sides 46 are soldered to the wall 33 of the bore 51 to 56.
  • the soldering can again be carried out in a vacuum oven or in a protective gas atmosphere. It should be emphasized that even with this configuration of the surface-enlarging insert, a much better heat transfer takes place between the heat transfer medium and the wall 33 of the channel 24.
  • the surface-enlarging insert 27, 39 consists of a highly thermally conductive metal such as copper, bronze, brass, aluminum, beryllium, a copper alloy and the like.
  • the pressure plate 11, 12 is usually made of steel.
  • a solder is selected from a good heat-conductive alloy, the melting point of which is above the operating temperature of the heat transfer medium, in order to avoid impairment of the soldered connection during operation of the double belt press. If the surface-enlarging insert 27, 39 consists of copper, then when vacuum-soldering the surface-enlarging insert 27, 39 with the walls 33 of the channels 24 solders, which consist of a silver compound, nickel compound or bronze and have a melting temperature of approx.
  • the individual copper profiles 34 and 49, 50 with a surface coating of solder.
  • This coating can be applied galvanically.
  • An electroplating bath in which an alloy consisting of approximately 80% copper and 20% tin is deposited on the outer surface of the copper profiles 34, 49, 50 has proven particularly useful.
  • the thickness of the coating with solder is around 60-100 micrometers.
  • the copper profiles 34, 49, 50 are then inserted into the bores 51 to 56 in a corresponding number. In this case, further cylindrical brazing rods can be dispensed with, since there is already sufficient solder on the surface of the copper profiles 34, 49, 50.
  • the copper profiles 34 and 49, 50 connect to each other for the surface-increasing insert 27, 39 and to the wall 33 of the bore 51 to 56.
  • This procedure advantageously ensures that between the wall 33 and the entire surface of the surface-increasing insert 27, 39, which bears against the wall 33, solder is present and no defects occur in the soldered connection. This ensures good heat transfer between the wall 33 and the surface-increasing insert 27, 39.
  • the surface-enlarging use according to the invention in the channels for the heat transfer medium can also be used in a conventional discontinuous single or multiple day press.
  • Fig. 10 the press plates 71 of a one-day press are shown, between which the material to be pressed 72 is pressed under the action of heat.
  • the press plates 71 are in these channels 66, which are formed by longitudinal bores in the pressure plates 71, attached.
  • surface-increasing inserts 68 are inserted, which rest with a surface 70 on the wall 67 of the channel 66.
  • Elements 69 extend from the surface 70 of the surface-increasing insert 68 and extend into the flow of the heat transfer medium.
  • the surface-enlarging insert 68 is designed in accordance with the surface-enlarging inserts 27 and 39 and is soldered into the channels 66 of the press plates 71 by the method described above. In the case of discontinuous single or multi-day presses, an improved heat transfer between the heat transfer medium and the pressure plates is achieved.
  • the structure of the surface-enlarging insert 27, 39 and its production is explained using the example of the pressure plate 11, 12 in the double belt press or the pressure plates 71 of a single-day press. If necessary, other parts of the double belt press to be heated or cooled, which are heated or cooled by convection by a heat transfer medium flowing in channels 24 of these parts, can be provided with such surface-increasing inserts 27, 39. This can be, for example, the channels 22 in the jacket 23 of the deflection drums 1 and 4 and also parts of the press frame.
  • the idea of the invention is important that it consists of a highly thermally conductive material, has several elements that protrude from one surface and protrude into the flow of the heat transfer medium, and this surface on the wall of the channel for the heat transfer medium is attached with a good thermal contact.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Press Drives And Press Lines (AREA)
  • Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)
  • Veneer Processing And Manufacture Of Plywood (AREA)
  • Laminated Bodies (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
EP88107044A 1987-05-26 1988-05-03 Doppelbandpresse mit erwärm- oder kühlbaren Teilen und Verfahren zu deren Herstellung Expired - Lifetime EP0292738B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873717649 DE3717649A1 (de) 1987-05-26 1987-05-26 Doppelbandpresse mit erwaerm- oder kuehlbaren teilen und verfahren zu deren herstellung
DE3717649 1987-05-26

Publications (3)

Publication Number Publication Date
EP0292738A2 EP0292738A2 (de) 1988-11-30
EP0292738A3 EP0292738A3 (en) 1990-01-10
EP0292738B1 true EP0292738B1 (de) 1992-12-23

Family

ID=6328403

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88107044A Expired - Lifetime EP0292738B1 (de) 1987-05-26 1988-05-03 Doppelbandpresse mit erwärm- oder kühlbaren Teilen und Verfahren zu deren Herstellung

Country Status (6)

Country Link
US (1) US5098514A (enrdf_load_stackoverflow)
EP (1) EP0292738B1 (enrdf_load_stackoverflow)
JP (1) JPS63309397A (enrdf_load_stackoverflow)
CN (1) CN1015296B (enrdf_load_stackoverflow)
DE (1) DE3717649A1 (enrdf_load_stackoverflow)
RU (1) RU2008225C1 (enrdf_load_stackoverflow)

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Also Published As

Publication number Publication date
EP0292738A2 (de) 1988-11-30
US5098514A (en) 1992-03-24
EP0292738A3 (en) 1990-01-10
JPS63309397A (ja) 1988-12-16
DE3717649A1 (de) 1988-12-15
CN1030044A (zh) 1989-01-04
CN1015296B (zh) 1992-01-15
JPH0358840B2 (enrdf_load_stackoverflow) 1991-09-06
RU2008225C1 (ru) 1994-02-28

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