US3926542A - Continuous press - Google Patents

Continuous press Download PDF

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Publication number
US3926542A
US3926542A US394105A US39410573A US3926542A US 3926542 A US3926542 A US 3926542A US 394105 A US394105 A US 394105A US 39410573 A US39410573 A US 39410573A US 3926542 A US3926542 A US 3926542A
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United States
Prior art keywords
spans
platens
heating
edge
edge portions
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Expired - Lifetime
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US394105A
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English (en)
Inventor
Karl-Heinz Ahrweiler
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    • 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

  • Such a press is improved in that 17 100/151 154 means are provided for regulating the temperature of the edge portions of the conveyor belts which extend [56] References C'ted beyond the bed of roller chains on each side of the UNITED STATES PATENTS press 2,075,735 3/1937 Loomis 425/72 X 2,559,365 7 1951 Middeton et al. 425/397 x 8 Clams 3 Drawmg Flgures US. Patent Dec. 16, 1975 3,926,542
  • This invention relates to continuous presses of the type including endless loops formed by longitudinally and transversely flexible conveyor belts which form opposed, substantially linear spans defining a pressing zone. Means are provided for rotatively driving one or both of the loops to drive the spans in the same direction, and press platens apply pressure and temperature through the traveling spans to the work carried therebetween. A multiplicity of endless loops of roller chains are interposed between each platen and its corresponding belt span and transmit pressure and temperature from the platen to the belt.
  • Such presses are used for the manufacture of wood-chip board, laminated products, minerally-bonded construction boards or plates, for sintering sheets of polytetrafluorethylene, etc. A press of this nature is described in US. Pat. application Ser. No. 308,556 filed Nov. 12, 1972, now US. Pat. No. 3,851,685 issued Dec. 3, 1974.
  • the belt spans usually extend transversely beyond the edges of the bed of roller chains so as to avoid clogging of the roller chains by the material to be pressed, for example, wood-chips, some which may fall over the edgesof the belt.
  • a further degree of stress in the belts results from strictly mechanical reasons, because the belts are somewhat compressed and therefore stretched longitudinally in a plurality of locations in the area of pressure application through the roller chains; the edge areas of the belts extending beyond the rollers, of course, are not so stretched. Further mechanical stresses on the other hand, tending to lead to a contraction of the middle portion of the belts result from the small bulges forming in the belts in the area of the roller chains between the rollers.
  • the present invention provides an arrangement for regulating the temperature in the edge portion of the belt spans in a press of this kind, thus reducing the undesirable stresses otherwise present in the belt spans.
  • a temperature regulating arrangement is provided which independently can regulate the temperature of the edge portions of the belt spans which extend beyon the width of the pressure and temperature transmitting elements, i.e., beyond the width of the bed of roller chains. In this manner theseedge portions of the belt spans can be influenced to reduce the undesirable stresses within the belts. It can also take the form of effecting, by tempe rature and the consequent expansion of the edge portions, an equalization of the longitudinal variations in the pressure applying area of the belt mechanically caused by the roller chains.
  • the degree of regulation is dependent upon the stress differences in the particular press operating under particular conditions and can be adjusted manually on the basis of observation or automatically.
  • the edge portions of the belt spans are at a lower tempera ture than the area of the belt spans through which pressure and temperature are transmitted to the work.
  • the invention is embodied in a heating arrangement through which the edge portions of the belt spans are heated.
  • the invention can also be embodied in a converse arrangement in which the edge portions of the belt spans must be cooled.
  • a longitudinal channel through which a fluid heat carrier medium flows is positioned at the edge of the belt span and extends the length of the pressure applying zone.
  • the heat carrier medium is a heating medium, such as hot air or another hot gas or a hot liquid which is pumped through the channel and gives off its heat to the outside, that is, to the edge portion of the belt span through the appropriately formed wall of the channel.
  • the channel can be an air duct positioned at the edge of the belt on the side thereof, away from the material to be treated, the air duct having an opening extending along its length directed toward the adjacent edge of the bed of roller chains.
  • the outer wall of the duct adjacent the edge portion of the belt span is positioned very close to the edge portion of the belt span and is provided with longitudinal ridges which operate in manner of alabyrinth seal.
  • the hot air passes through the opening against the belt span edge and heats this edge directly.
  • the heat radiating through the wall of the air duct and the longitudinal ridges adjacent the edge of the belt span also heats the edge of the belt. Furthermore in this manner, a certain degree of excess pressure is maintained in the area of the edge of the bed of roller chains, tending to prevent the introduction of dirt into the roller chain bed.
  • the longitudinal ridges of the air duct, functioning as a labyrinth seal help maintain this excess pressure.
  • rod-shaped electric heating elements can be positioned parallel to the direction of travel of the belts near the edges thereof.
  • the heating of the edge sectors of the belt spans is accomplished primarily by radiation.
  • an electric heating means operating directly on the edge portion of the belt span
  • an inductive heating arrangement can be provided.
  • contact elements engaging the edge portions of the belt are provided and heating is accomplished in the form of resistance heating between these elements.
  • FIG. 1 show a continuous press having a massof resin-bonded wood-chips pressed together between opposed endless conveyor belts having a heating channel.
  • FIG. 2 shows another embodiment in which infrared heating elements are provided.
  • FIG. 3 shows a further embodiment in which an inductive heating arrangement is provided.
  • FIG. 1 the work 1 is shown comprising a mass of resinbonded wood-chips pressed together between opposed, substantially linear spans 2 and 3 of two endless conveyor belt loops made of steel of l to I .5 mm thickness.
  • Each platen includes a heating plate 5 having channels 6 extending therethrough transversely to the direction of travel of the belts, the channels being connected at their ends by elbows 7. A heating medium pumped into the resulting endless channel brings the heating plate to its proper temperature and heat is thus transmitted through the rollers 4 to each belt span 2 and 3 and is thus applied to the work 1.
  • Each pressure platen further includes a return guide plate 8 having grooves 9 through which the roller chains 4 loop around the platen in a longitudinal direction.
  • the embodiment of FIG. 1 includes heating channels 12 which extend in the direction of travel of the belts along the edge of the spans 2 and 3 in the pressure zone. Hot air is blown through these heating channels 12 in order to heat the edges of the belt spans 2 and 3. Heating the edges of the belt span tends to equalize both the strsses caused by the higher temperature in the central portion of the belt spans, as well as the mechanical stresses caused by the stretching of the span by'the pressure of the rollers. The transmission of heat occurs on the one hand directly through the opening 13, through which the hot air is blown directly against the edges of the belt spans, and, on the other hand, indirectly through radiation from the heated walls of the heating channel 12.
  • the portion 14 of the wall of the heating channel in the immediate proximity of the edges of the spans can be provided with longitudinal ridges 15, which increase the surface area of the wall and thus increase the radiation therefrom.
  • the plurality of parallel longitudinal ridges 15, extending from the outer surface of the wall of the heating channel 12 toward the edge of the belt span, have a further function. They form with the adjacent edge surface of the belt span a labyrinth seal, retarding escape of the air streaming through the opening 13, so that a degree of excess pressure is maintained in the vicinity of the edge of the bed of roller chains 4, thus tending to prevent dirt from entering the roller chain bed.
  • FIG. 2 shows another embodiment of the invention in which an infrared heating element 16 is provided instead of the heating channel 12.
  • This heating element rod-shaped and of extended length, gives off heat by radiation.
  • An intensive effect is achieved when, as shown, the infrared heating element 16 is positioned between the edges of the belt spans 2 and 3.
  • the thickness of the work varies and thus the distance between the belt spans 2 and 3 of the press must be adjustable, so that the heating element 16 may no longer fit therebetween. In such cases i the heating element can be located with respect to the edges of the spans 2 and 3 as shown in the position 16 in FIG. 2.
  • FIG. 3 illustrates schematically a further embodiment in which an inductive heating arrangement 17 which heats the edges of the belt spans 2 and 3 directly is suggested.
  • the inductive heating arrangement induces currents in the edges of the steel spans which result in the desired increase in temperature.
  • the heating elements extend longitudinally along the edges of the belt spans substantially along the entire length of the pressure zone throughout which the edge temperature is to be regulated. It is also possible, however, to provide heating arrangements in accordance with the invention, which are positioned at one or more points along the edges of the spans in the pressure zone.
  • An improved continuous press including endless loops formed by conveyor belts which form opposed substantially linear spans defining a pressing zone, press platens applying pressure and heat through said travelling spans to work carried therebetween and anti friction means interposed between said platens and said spans, said anti-friction means transmitting pressure and heat between said platens and said spans, the spans having edge portions extending laterally beyond the lateral edges of said platens and said anti-friction means; the improvement comprising means for independently regulating the temperature of said edge portions of said spans.
  • the anti-friction means interposed between said platens and said spans comprise a multiplicity of endless loops of roller chains forming a bed of rollers interposed between said platens and said spans.
  • the temperature regulating means comprise a heating channel for receiving a fluid heat carrier medium associated with 6.
  • the temperature regulating means comprise rod-shaped infrared heat elements positioned longitudinally between each pair of opposite edge portions of said spans.
  • thermoregulating means comprise electrical heating apparatus operating directly upon each of said edge portions of the spans.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Press Drives And Press Lines (AREA)
  • General Induction Heating (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
US394105A 1972-09-04 1973-09-04 Continuous press Expired - Lifetime US3926542A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2243465A DE2243465C3 (de) 1972-09-04 1972-09-04 Kontinuierlich arbeitende Presse

Publications (1)

Publication Number Publication Date
US3926542A true US3926542A (en) 1975-12-16

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US394105A Expired - Lifetime US3926542A (en) 1972-09-04 1973-09-04 Continuous press

Country Status (9)

Country Link
US (1) US3926542A (fi)
JP (1) JPS4966751A (fi)
BR (1) BR7306743D0 (fi)
DE (1) DE2243465C3 (fi)
FI (1) FI56334C (fi)
GB (1) GB1404105A (fi)
IT (1) IT995208B (fi)
SE (1) SE405089B (fi)
SU (1) SU476742A3 (fi)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4050872A (en) * 1975-10-11 1977-09-27 Eduard Kusters Roller chain guide arrangement
US4164387A (en) * 1977-06-30 1979-08-14 Sandvik Conveyor Gmbh Apparatus for producing sheet material
US4164386A (en) * 1977-07-02 1979-08-14 Sandvik Conveyor Gmbh Apparatus for producing sheet material
US4213748A (en) * 1978-05-06 1980-07-22 Eduard Kusters Press for compacting material to form a traveling web
US4336096A (en) * 1980-03-22 1982-06-22 Theodor Hymmen Kg Belt press apparatus with heat shield
US4410380A (en) * 1978-10-05 1983-10-18 Eduard Kusters Method for the continuous manufacture of sheets of material especially wood chip board
US4417865A (en) * 1980-11-14 1983-11-29 Maschinenfabrik J. Dieffenbacher Gmbh Co. Continuously operating press
US4485733A (en) * 1982-02-27 1984-12-04 Kurt Held Arrangement for the support of press bands at roller body supported double band presses
US4802955A (en) * 1986-11-05 1989-02-07 Rauma-Repola Oy Dewatering band press side seals
US4881888A (en) * 1987-09-01 1989-11-21 Bo Folkesson Press for the continuous production of boards
US4921037A (en) * 1988-07-19 1990-05-01 Hazelett Strip-Casting Corporation Method and apparatus for introducing differential stresses in endless flexible metallic casting belts for enhancing belt performance in continuous metal casting machines
US5085812A (en) * 1987-02-17 1992-02-04 Eduard Kusters Maschinenfabrik Gmbh & Co. Kg Method of and plant for the manufacture of wood chipboards and similar board materials
US5224367A (en) * 1991-02-22 1993-07-06 Eduard Kusters Maschinenfabrik Gmbh & Co Kg Method for the treatment of the steel belts of a double belt press
US5284609A (en) * 1989-02-18 1994-02-08 Eduard Kusters Maschinenfabrik Gmbh & Co Kg Method and apparatus for the manufacture of wood chip boards and similar board materials
CN102962878A (zh) * 2012-12-05 2013-03-13 三门峡市易兴人造板设备有限公司 用于连续压机入口的加压加热装置

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3046431A1 (de) * 1980-12-10 1982-09-09 Santrade Ltd., 6002 Luzern Doppelbandpresse
DE3348485C2 (de) * 1983-07-15 1995-06-08 Held Kurt Doppelbandpresse zur kontinuierlichen Herstellung von Laminaten
EP0491972B1 (de) * 1990-12-21 1994-10-26 Bison-Werke Bähre & Greten GmbH & Co. KG Kontinuierlich arbeitende Bandpresse
DE10148956C5 (de) * 2001-10-04 2009-04-16 Siempelkamp Maschinen- Und Anlagenbau Gmbh & Co. Kg Kontinuierliche Presse zum Verpressen von Pressgutmatten zu Pressgutplatten

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2075735A (en) * 1931-12-01 1937-03-30 Evarts G Loomis Continuous method of and apparatus for making plastic products
US2559365A (en) * 1946-10-02 1951-07-03 Earl F Middleton Apparatus for reforming thermoplastic sheets
US2602960A (en) * 1948-11-24 1952-07-15 British Artificial Resin Compa Press for the manufacture of continuous web material
US3142714A (en) * 1961-12-20 1964-07-28 Nylonge Corp Method for the production of cleaning devices
US3371383A (en) * 1965-09-28 1968-03-05 Swedlow Inc Continuous casting apparatus
US3408690A (en) * 1966-12-07 1968-11-05 Grace W R & Co Apparatus for making foamed polymeric structures

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2075735A (en) * 1931-12-01 1937-03-30 Evarts G Loomis Continuous method of and apparatus for making plastic products
US2559365A (en) * 1946-10-02 1951-07-03 Earl F Middleton Apparatus for reforming thermoplastic sheets
US2602960A (en) * 1948-11-24 1952-07-15 British Artificial Resin Compa Press for the manufacture of continuous web material
US3142714A (en) * 1961-12-20 1964-07-28 Nylonge Corp Method for the production of cleaning devices
US3371383A (en) * 1965-09-28 1968-03-05 Swedlow Inc Continuous casting apparatus
US3408690A (en) * 1966-12-07 1968-11-05 Grace W R & Co Apparatus for making foamed polymeric structures

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4050872A (en) * 1975-10-11 1977-09-27 Eduard Kusters Roller chain guide arrangement
US4164387A (en) * 1977-06-30 1979-08-14 Sandvik Conveyor Gmbh Apparatus for producing sheet material
US4164386A (en) * 1977-07-02 1979-08-14 Sandvik Conveyor Gmbh Apparatus for producing sheet material
US4213748A (en) * 1978-05-06 1980-07-22 Eduard Kusters Press for compacting material to form a traveling web
US4410380A (en) * 1978-10-05 1983-10-18 Eduard Kusters Method for the continuous manufacture of sheets of material especially wood chip board
US4336096A (en) * 1980-03-22 1982-06-22 Theodor Hymmen Kg Belt press apparatus with heat shield
US4417865A (en) * 1980-11-14 1983-11-29 Maschinenfabrik J. Dieffenbacher Gmbh Co. Continuously operating press
US4485733A (en) * 1982-02-27 1984-12-04 Kurt Held Arrangement for the support of press bands at roller body supported double band presses
US4802955A (en) * 1986-11-05 1989-02-07 Rauma-Repola Oy Dewatering band press side seals
US5085812A (en) * 1987-02-17 1992-02-04 Eduard Kusters Maschinenfabrik Gmbh & Co. Kg Method of and plant for the manufacture of wood chipboards and similar board materials
US4881888A (en) * 1987-09-01 1989-11-21 Bo Folkesson Press for the continuous production of boards
US4921037A (en) * 1988-07-19 1990-05-01 Hazelett Strip-Casting Corporation Method and apparatus for introducing differential stresses in endless flexible metallic casting belts for enhancing belt performance in continuous metal casting machines
US5284609A (en) * 1989-02-18 1994-02-08 Eduard Kusters Maschinenfabrik Gmbh & Co Kg Method and apparatus for the manufacture of wood chip boards and similar board materials
US5224367A (en) * 1991-02-22 1993-07-06 Eduard Kusters Maschinenfabrik Gmbh & Co Kg Method for the treatment of the steel belts of a double belt press
CN102962878A (zh) * 2012-12-05 2013-03-13 三门峡市易兴人造板设备有限公司 用于连续压机入口的加压加热装置

Also Published As

Publication number Publication date
SU476742A3 (ru) 1975-07-05
SE405089B (sv) 1978-11-20
IT995208B (it) 1975-11-10
DE2243465A1 (de) 1974-04-04
DE2243465C3 (de) 1979-11-22
BR7306743D0 (pt) 1974-06-27
DE2243465B2 (de) 1976-10-28
JPS4966751A (fi) 1974-06-28
FI56334C (fi) 1980-01-10
FI56334B (fi) 1979-09-28
GB1404105A (en) 1975-08-28

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