US3640660A - Press, particularly for forming fiber plates - Google Patents

Press, particularly for forming fiber plates Download PDF

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Publication number
US3640660A
US3640660A US765772A US3640660DA US3640660A US 3640660 A US3640660 A US 3640660A US 765772 A US765772 A US 765772A US 3640660D A US3640660D A US 3640660DA US 3640660 A US3640660 A US 3640660A
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United States
Prior art keywords
platens
pressure
platen
cylinder piston
detector
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Expired - Lifetime
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US765772A
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English (en)
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Albert De Mets
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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
    • B30B15/16—Control arrangements for fluid-driven presses
    • B30B15/24—Control arrangements for fluid-driven presses controlling the movement of a plurality of actuating members to maintain parallel movement of the platen or press beam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing
    • B27N3/20—Moulding or pressing characterised by using platen-presses

Definitions

  • a press utilizing two pressure platens provides means for measuring the relative distance between the two pressure platens when the platens are in a closed operative position.
  • a signal is generated indicative of the relative distance between the platens and means for varying the flow of pressurized fluid to one or more cylinder piston assemblies connected to a pressure platen is provided.
  • an adjustable rotatable disc carrying spacing pins is provided which permits the adjustment of the relative position of the upper and lower pres sure platensv 4 Claims, 2 Drawing Figures l0 4 ll FATENTEBFEB 8 m2 SHEET 2 nr 2 N'QTL PRESS, PARTICULARLY FOR FORMING FIBER PLATES
  • This invention has for its object a press, particularly for forming fiber plates, which is comprised of two pressure platens located one above the other, one at least of said platens being vertically reciprocatable.
  • Fiber plates have been manufactured up to now on the present presses in an uneconomical way. Indeed, the outermost layers are made of a generally expensive raw material to which a large amount of glue is added to give to the fiber plates a hard closed outer surface.
  • This expensive raw material is comprised of thin fibers which are prepared in a particular way by means of heavy shaving machines the output of which is very low. After the pressing of the various raw materials into a plate, such plate is brought to a desired constant thickness by means of expensive sanding machines with high output and a large consumption of sanding belts. An important part of the expensive outer layers is removed by these sanding machines.
  • the invention has for purpose to obviate these drawbacks by providing a press which allows to obtain a fiber plate which has directly the desired constant thickness in every cross section thereof and which thus does not have to be brought to the desired thickness by sanding, which means an enormous saving both in machines and raw material.
  • the fibers may have a thickness up to 0.4 mm., whereby the output of a shaving machine may largely be increased.
  • the thickness of the outer layers may be reduced to a minimum and it is generally sufficient to use for the making of these outer layers, the fine fibers which are found in waste products.
  • the amount of glue used is also much reduced.
  • means are provided for maintaining constant, within predetermined limits, the spacing between both pressure platens over the whole width thereof during the press operation.
  • the said means have at least one regulating device which cooperates at least with those pistons located centrally relative to the pressure platens and allows to act automatically upon said pistons according to an adjusted spacing between the pressure platens.
  • one of the pressure platens has independently operating detectors which cooperate with the regulating devices. Each detector reacts to a spacing differential due to a distortion of at least one pressure platen and transmits an impulse proportional to the spacing differential to the corresponding regulating device.
  • the regulating device is coupled to one or more pistons located immediately adjacent a detector and causes a pressure change proportional to the pulse until the desired spacing between the pressure platens is reached.
  • FIG. 1 is a diagrammatic showing of a press according to a first embodiment of the invention.
  • FIG. 2 is a diagrammatic showing of a press according to a second embodiment of the invention.
  • FIG. 1 a front view of a press for the shaping of fiber plates which according to the invention, allows during the pressing of a fiber cake, to control the thickness thereof in various points of the press in a continuous way and to compare same with a previously adjusted value, to operate the possibly required corrections. Without such a control, it is substantially impossible to obtain, from some width of the press upwards, plates with a constant thickness. This is to be imputed to the distortions of the pressure platens resulting from the heat and the pressure to which these platens are subjected.
  • the press according to the invention is comprised of two heated pressure platens l and 2 located one above the other,
  • control occurs by means of an electronic apparatus, which is only shown partially, and which has been used mostly up to now for determining the thickness of the fiber plates leaving the sanding machines which have been mentioned above.
  • This apparatus is mainly comprised of a series of detectors 7 which contact the outer surface of the upper pressure platen 2 and which may follow the distortions thereof.
  • Each detector 7 is mounted on a regulating and measuring instrument 8 which is coupled to the adjacent piston(s) S.
  • the regulating and measuring instruments 8 are distributed over U-shape beams 9 which extend, in parallel relationship with one another, over the whole width above the pressure platen 2.
  • the contact point of the adjusting screw 12 with the platen I always lies substantially on the vertical line that passes through the contact point of a detector 7 with the platen 2.
  • the spacing measured by an instrument 8 is the spacing between the contact point of the corresponding detector with the platen 2 and the undemeath-located contact point of an adjusting screw 12 with the platen l.
  • the desired spacing between the platens l and 2 may be adjusted.
  • the detector 7 which lies in this location, transmits a pulse proportional to such change to the corresponding regulating and measuring instrument 8, which in turn determines a pressure change proportional to said pulse, for the piston(s) 5 in said location until the adjusted spacing between the pressure platens I and 2 is again reached in said location.
  • gauges which are comprised of prisms with well-determined thicknesses, are used or not for the adjusting of the desired thickness of the fiber cake.
  • the gauges may be dispensed with and a spacing adjustment may be provided between the mutually facing ends of the U-beams 9 and 10.
  • a disk 14 On both vertical legs of the lower beam 10 is mounted a disk 14 rotatable about a vertical axis. This disk 14 bears on the upper side thereof, on the edge of the disk, spacing pins 15 of different length, which extend in parallel relationship with said axis and which may be brought separately, by a rotation of the disk 14 over some determined angle, between the facing ends of the beams 9 and 10 so as to determine the desired spacing between said ends and consequently between the pressure platens 1 and 2. Because a good contact of the beam 9 with the spacing pins 15 should be provided, the vertical parts of the beam 9 are guided in side extension pieces 16 of the pressure platen 2 and a spring 17 is provided between these extension pieces 16 and the free end of the beam 9.
  • the dispensing of the gauges further gives to the press according to the invention an additional precision. There is always a danger that foreign materials set down on the gauges.
  • the removal of the gauges also gives an important advantage as regards work saving and output increase. The replacement of the gauges must be made with great accuracy and requires much time, which thus goes together with an important production loss.
  • the mechanical spacing adjustment between the beams 9 and 10 may even be dispensed with.
  • the corresponding ends of beams 9 and 10 are pushed against one another by means of the springs 17 and the instruments 8 should have a measuring range which covers the complete thickness of the pressed fiber cake.
  • the measuring range of the instruments 8 only has to cover the possible variations in the thickness relative to the adjusted value. The instruments 8 will work in these latter cases with a higher accuracy.
  • detectors 7 are provided together with regulating instruments 8 both on the pressure platen 2 and on the pressure platen 1.
  • the regulating instruments 8 which are to cooperate with the upper pressure platen 2 have, as the ones mentioned above, a measuring range which is large enough to cover the complete thickness of the cake, while those regulating instruments which cooperate with the lower pressure platen 1 have a smaller measuring range as they only have to follow the distortions of said platen 1.
  • Two regulating instruments with detector contact points which are located on the same vertical line then form a regulating unit by differential measuring.
  • the pressure platen l bears no more on fixed adjusting screws but rather on detectors 7 of regulating instruments 8.
  • the above-described spacing pins between the beams 9 and 10 for determining the thickness are also dispensed with. They may be replaced by an electronic adjustment.
  • Such electronic adjustment may possibly be combined with gauges 20 which are arranged between the edges of the pressure platens 1 and 2.
  • the gauges only serve to determine the thickness of the portion of the cake adjacent the edges thereof, while the electronic adjustment is designed to regulate the thickness of the center portion of the cake.
  • the electronic adjustment also serves to regulate the thickness of the cake at the edges thereof.
  • the beams 9 and 10 further form together a closed framing about the pressure platens 1 and 2, which are movable within certain limits independently of said framing.
  • regulating and measuring instruments any device which enables to reach the object mentioned above.
  • the regulating and measuring instruments may act in another way than by pressure regulation on the pistons of the press for maintaining constant the spacing between the pressure platens.
  • a press particularly for shaping fiber plates comprising two pressure platens;
  • means for supporting the two pressure platens including a lower supporting base, a U-shaped beam and a revolving disc carrying a plurality of spacing pins extending perpendicular to the plane of the disc, the spacing pins locating the U-shaped beam relative to the lower supporting base;
  • a plurality of cylinder piston assemblies operatively connected with at lease one of the platens for exerting pressure at regularly dispersed points on the exterior face of the platen;
  • means for measuring the relative distance between the two pressure platens when the platens are in a closed operative position including a detector located adjacent the operative connection of each cylinder piston assembly with the platen for generating a signal indicative of the relative distance, each detector providing a single which permits the adjustment of the pressurized fluid flow to the cylinder piston assembly located adjacent the detector, and
  • a press as in claim 1 wherein the means for supporting the two pressure platens further includes heat-isolating legs attached to one of the platens and spring means supportably attached to the lower supporting base.
  • a press particularly for shaping fiber plates comprising two pressure platens;
  • means for supporting the two pressure platens including a lower supporting base and a U-shaped beam, each operatively connected to a pressure platen;
  • a plurality of cylinder piston assemblies operatively connected with at least one of the platens for exerting pressure at regularly dispersed points on the exterior face of the platen;
  • means for measuring the relative distance between two pressure platens when the platens are in a closed operative position including a detector located adjacent the operative connection of each cylinder piston assembly with the platen for generating a signal indicative of the relative distance, each detector providing a signal which permits the adjustment of the pressurized fluid flow to the cylinder piston assembly located adjacent the detector, and

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Treatment Of Fiber Materials (AREA)
US765772A 1967-10-10 1968-10-08 Press, particularly for forming fiber plates Expired - Lifetime US3640660A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE704898 1967-10-10

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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3729966A (en) * 1972-02-02 1973-05-01 Ibm Apparatus for contouring the surface of thin elements
US3784340A (en) * 1971-08-16 1974-01-08 I Kerttula Machine for continuous manufacturing of chip boards
US3786660A (en) * 1972-11-24 1974-01-22 Ibm Wafer interlocking transport system
US3969061A (en) * 1972-02-11 1976-07-13 Pennsylvania Engineering Corporation Concrete press with mold clamping means
US4036570A (en) * 1974-06-03 1977-07-19 Besser Company Cementitious product making system with product height gauging mechanism
US4164389A (en) * 1977-01-27 1979-08-14 Norfield Corporation Apparatus for forming expanded panels
US4240778A (en) * 1979-08-27 1980-12-23 Efco, Inc. System for providing for parallelism in fluid powered press or the like
US4247278A (en) * 1978-07-11 1981-01-27 Europress S.A.S. Di Giusti Lino & C. Pressing machine arrangement
US4289467A (en) * 1980-03-06 1981-09-15 G. Siempelkamp Gmbh & Co. Apparatus for the pressing of mats of pressable material, especially for the production of particleboard
US4307050A (en) * 1979-12-14 1981-12-22 Bison-Werke Bahre & Greten Gmbh & Co. Kg Heated platten press
US4408520A (en) * 1981-01-20 1983-10-11 G. Siempelkamp Gmbh & Co. Apparatus for measuring platen-press bend in platen press
US4615857A (en) * 1984-11-30 1986-10-07 Motorola, Inc. Encapsulation means and method for reducing flash
US5045250A (en) * 1988-06-11 1991-09-03 Fried. Krupp Gesellschaft Mit Beschrankter Haftung Method of apportioning the quantity of material in the manufacture of molded products made from hardenable molding compounds
EP0492300A2 (de) * 1990-12-22 1992-07-01 Umformtechnik ERFURT GmbH Verfahren zur Anpassung der Wegmesseinheiten hydraulischer Kunststoffpressen an unterschiedlich hoch ausgebildete Presswerkzeuge und zur Durchführung des Verfahrens geeignete Vorrichtung
EP0494614A2 (en) * 1991-01-07 1992-07-15 Husky Injection Molding Systems Ltd. Friction clamp for injection molding machine
CN102285139A (zh) * 2011-06-01 2011-12-21 上海板机电气制造有限公司 一种平板式连续压机的控制方法及控制装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103465328B (zh) * 2013-10-08 2015-06-10 李爱培 木板挤压设备

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2500791A (en) * 1947-08-08 1950-03-14 Baldwin Locomotive Works Supporting means for press platens
US2884033A (en) * 1957-05-06 1959-04-28 Washington Iron Works Multi-platen hot press
US2956307A (en) * 1956-03-26 1960-10-18 Fahrni Fred Method for pressing boards composed of particles
US3078515A (en) * 1960-05-16 1963-02-26 Wintriss George Safety control for hydraulic machine with high pressure closing
US3126578A (en) * 1964-03-31 board forming press and method of making board substitutes
US3242533A (en) * 1964-04-16 1966-03-29 Wintriss George Safety control for hydraulic mold machine with low pressure closing
US3401425A (en) * 1965-04-14 1968-09-17 Ostrander Seymour Co Dimensional control system
US3446879A (en) * 1965-02-17 1969-05-27 United Shoe Machinery Corp Method and means for pressure-moulding of articles by controlling the fluid pressure through utilization of the deformation of the platen

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3126578A (en) * 1964-03-31 board forming press and method of making board substitutes
US2500791A (en) * 1947-08-08 1950-03-14 Baldwin Locomotive Works Supporting means for press platens
US2956307A (en) * 1956-03-26 1960-10-18 Fahrni Fred Method for pressing boards composed of particles
US2884033A (en) * 1957-05-06 1959-04-28 Washington Iron Works Multi-platen hot press
US3078515A (en) * 1960-05-16 1963-02-26 Wintriss George Safety control for hydraulic machine with high pressure closing
US3242533A (en) * 1964-04-16 1966-03-29 Wintriss George Safety control for hydraulic mold machine with low pressure closing
US3446879A (en) * 1965-02-17 1969-05-27 United Shoe Machinery Corp Method and means for pressure-moulding of articles by controlling the fluid pressure through utilization of the deformation of the platen
US3401425A (en) * 1965-04-14 1968-09-17 Ostrander Seymour Co Dimensional control system

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3784340A (en) * 1971-08-16 1974-01-08 I Kerttula Machine for continuous manufacturing of chip boards
US3729966A (en) * 1972-02-02 1973-05-01 Ibm Apparatus for contouring the surface of thin elements
US3969061A (en) * 1972-02-11 1976-07-13 Pennsylvania Engineering Corporation Concrete press with mold clamping means
US3786660A (en) * 1972-11-24 1974-01-22 Ibm Wafer interlocking transport system
US4036570A (en) * 1974-06-03 1977-07-19 Besser Company Cementitious product making system with product height gauging mechanism
US4164389A (en) * 1977-01-27 1979-08-14 Norfield Corporation Apparatus for forming expanded panels
US4247278A (en) * 1978-07-11 1981-01-27 Europress S.A.S. Di Giusti Lino & C. Pressing machine arrangement
US4240778A (en) * 1979-08-27 1980-12-23 Efco, Inc. System for providing for parallelism in fluid powered press or the like
US4307050A (en) * 1979-12-14 1981-12-22 Bison-Werke Bahre & Greten Gmbh & Co. Kg Heated platten press
US4289467A (en) * 1980-03-06 1981-09-15 G. Siempelkamp Gmbh & Co. Apparatus for the pressing of mats of pressable material, especially for the production of particleboard
US4408520A (en) * 1981-01-20 1983-10-11 G. Siempelkamp Gmbh & Co. Apparatus for measuring platen-press bend in platen press
US4615857A (en) * 1984-11-30 1986-10-07 Motorola, Inc. Encapsulation means and method for reducing flash
US5045250A (en) * 1988-06-11 1991-09-03 Fried. Krupp Gesellschaft Mit Beschrankter Haftung Method of apportioning the quantity of material in the manufacture of molded products made from hardenable molding compounds
EP0492300A2 (de) * 1990-12-22 1992-07-01 Umformtechnik ERFURT GmbH Verfahren zur Anpassung der Wegmesseinheiten hydraulischer Kunststoffpressen an unterschiedlich hoch ausgebildete Presswerkzeuge und zur Durchführung des Verfahrens geeignete Vorrichtung
EP0492300A3 (en) * 1990-12-22 1992-12-23 Krupp Maschinentechnik Gesellschaft Mit Beschraenkter Haftung Method for adapting the travel measuring units of hydraulic presses for composites, for pressing tools of varying weight and device for applying the method
EP0494614A2 (en) * 1991-01-07 1992-07-15 Husky Injection Molding Systems Ltd. Friction clamp for injection molding machine
EP0494614A3 (en) * 1991-01-07 1993-02-24 Husky Injection Molding Systems Ltd. Friction clamp for injection molding machine
CN102285139A (zh) * 2011-06-01 2011-12-21 上海板机电气制造有限公司 一种平板式连续压机的控制方法及控制装置
CN102285139B (zh) * 2011-06-01 2014-07-09 上海板机电气制造有限公司 一种平板式连续压机的控制装置

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Publication number Publication date
BE704898A (da) 1968-02-15

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