US3685932A - Heating platen press - Google Patents

Heating platen press Download PDF

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Publication number
US3685932A
US3685932A US67412A US3685932DA US3685932A US 3685932 A US3685932 A US 3685932A US 67412 A US67412 A US 67412A US 3685932D A US3685932D A US 3685932DA US 3685932 A US3685932 A US 3685932A
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US
United States
Prior art keywords
members
press
heating
bores
bridge members
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
US67412A
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English (en)
Inventor
Heinrich Pfeiffer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dieffenbacher GmbH Maschinen und Anlagenbau
Original Assignee
Dieffenbacher GmbH Maschinen und Anlagenbau
Priority date (The priority date 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 date listed.)
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Publication date
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Publication of US3685932A publication Critical patent/US3685932A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • 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
    • B27N3/203—Moulding or pressing characterised by using platen-presses with heating or cooling means

Definitions

  • each of the structures being composed of a plurality of individual bridge members and rib members interconnecting the bridge members and forming conjointly therewith a grid extending'over the entire width of the press; press platens loosely mounted on the grid at the workpieceside thereof, the rib members having fluid circulation passages for equalizing longitudinal thermal tensions, and the bridge members having fluid circulation passages for equalizing transverse thermal tensions.
  • the invention relates to a heating platen for the.
  • Presses of this general type may be assembled of prefabricated parts formed of a plurality of individual crossbeams or struts, the individual crossbeams being subjected to the action of one or more circulatory loops.
  • the most pressing problem in heating platen presses employed for producing wood composition panels such as chip and fiber boards and the like is to maintain the press surfaces formed by the press platen in planar form as the pressure and heat are transferred to the material being compressed, so that the compressed panel or board can emerge from the press with the least possible deviation from the nominal or datum thickness thereof.
  • the deformations in table and ram caused by thermal stresses are sought to be prevented by providing in compensation of the one-sided heat flow of the heatedpress plates on table and ram, a counter-heating on the opposite side thereof.
  • This counter-heating system is connectible to the circulatory loop on the press platen or may constitute an individual circulatory loop.
  • a detrimental effeet is produced by stresses that occur during the heating effected between the heated and the unheated portions of table and ram, and thereby, deformations which are produced have a negative effect also upon the planar faces of the press platens. Stresses deriving from both circulatory heating loops produce deformations in the length and in the width which cannot be entirely eliminated even through a controlled heat supply.
  • the known heating platen presses do not offer a satisfactory solution despite their high costs of construction.
  • heating platen presses having several circulatory heating loops which are independent of each other, there is always a possibility that one of the heating loops will cease to function and that deformations caused by thermal stresses will occur in the table and ram, which can result in damage to individual components. It is therefore a further object of the invention to provide heating platen press with safety means for preventing such damage.
  • heatable single or multilevel platen press for the manufacture of wood composition panels or the like, comprising a stationary base structure and a hydraulically displaceable structure, each of the structures being composed of a plurality of individual bridge members and rib members interconnecting the bridge members and forming conjointly therewith a grid extending over the entire width of the press; press platens loosely mounted on the grid at the workpiece-side thereof, the rib members having fluid circulation passages for equalizing longitudinal thermal tensions, and the bridge members having fluid circulation passages for equalizing transverse thermal tensions.
  • the structural features of the invention not only assure the balancing or compensation of heat stresses within the table and ram, but in addition provide a heat thrust in longitudinal direction of the heating platen press above the neutral axis, as a counterforceto the heat thrust emanating from the heated press platen which acts below the neutral axis and would otherwise cause deformation in longitudinal direction.
  • the heat thrust in longitudinal direction of the heating platen press may be intentionally controlled when the ribs are divided in two and are formed of counterheating ribs and operational heating ribs which can be supplied with heat separately and differentially.
  • Heat stresses in the table and ram which deform the planar surfaces of the press platen, can also result from the fact that during the compression process, heat energy will be removed too rapidly and in too large a quantity from the press platen.
  • I provide heating platen press in accordance with a further feature of my invention, with a safety loop wherein the bores of the press platen, the bores of the bridge members adjacent the press platen below the neutral axis, and the bores of the counter- ,minimum deformation and consequent deformation in the width of the ram and table.
  • I provide heating platen press with a safety loop formed of a combination of the circulatory loops for the operational heating and the counter-heating into one loop, only the bores in the bridge members adjacent the press platen being provided with an individual heating and cooling circulatory loop with accurate control.
  • the compression process should start with press platens bent convexly about the longitudinal center line, those press, platens first attaining their planar surfaces during the compression or pressing period. This is intendedprimarily so'that the steam cushion being formed can escape satisfactorily as it, too, may be responsible for a negative production tolerance when there is localizedinclusion.
  • small heating plates mounted on the longitudinal center line of the press platen.
  • the bores of the small heating plates are connectible to the circulatory loop of the operational heating system or may have their owncirculatory loop.
  • the press is constructed according to the static data or conditions by the maximal compressive force and that no overdimensioning of the components which transmit the compressive force is required since the thermalstress forces are-small, if they exist at all, and can be countered at the damaged locations quickly, for example, by distributing the heating or the cooling action over several controllable circulatory loops.
  • the bores of the rib members are also arrangedperpendicularly to the press platen.
  • FIG. 1 is a side-elevational view, partly in section, of the heating platen press according to the invention
  • FIG. 2 is a front-elevational view of FIG. 1;
  • FIG. 3' is a view similar to that of FIG. 1 of another embodiment of the invention, wherein the heating platen press has trapezoidal bridge members;
  • FIGS. 4 and 5 are enlarged side-elevational and horizontal sectional views, respectively, of astructural the crossbeam is provided with two-part rib members and with small heating plates placed around the longitudinal center line'of the press platen.
  • FIGS. 1 to 3 there is shown a heating platen press constructed in accordance with the invention and having as its main parts a stationary table and a movable ram, with the stationary table being composed of a number of individual crossbeams 1, and the movable ram of a number of individual crossbeams 2.
  • the movable ram is braced, with the aid of return stroke devices, against the press cylinder piston devices formed of the pressure pistons 26, the tension columns 27 and the press cylinders 25.
  • the individual crossbeams 1 and 2 are erected as a relatively high structure having torsional stiffness and capable of coping with thermal expansion, the crossbeams being assembled so that their wide side e, i.e.
  • Rib members which-connect the bridge members 4 are of bipartite construction and, with respect to the heating effect, are referred to as operational heating ribs 19 and counter-heating ribs 20. Ribs 22 and 23 are located along the longitudinal center line. In the effective compression surface region, the press platens 3 are loosely mounted at the table and 'ram. According to the invention, bores 9 are formed not only in the press platens 3, but bores 11 are also provided in the rib members 20 and 23 and bores and 31 in the bridge members 4.
  • heat expansion openings 7 and 8 are formed about the neutral axis A-B in the bridge members 4.
  • the bridge members 16 are again of planar form, extending from the longitudinal line 29 of the compressed material,
  • bores 28 are disposed therein at an inclination to the horizontal.
  • FIGS.'4 to 7 Structural details of the individual crossbeams l for a table, are shown in FIGS.'4 to 7.
  • the individual crossbeams according to FIGS. 4 to 5, are provided with continuous rib members 5 and 6, while the rib members in FIGS. 6 and 7, are divided into operatively heating ribs 19 and 22 and into counter-heating ribs 20 and 23, so as to effect a separation of the heat flow above and below the neutral axis A-B.
  • the bridge members 4 are provided with bores 32, which run vertically in the direction of the press platen and, between bridge members 4, small heating plates 24 with bores 18 are situated upon the press platen 3.
  • the small heating plates 24 are so arranged on the longitudinal center line of the heating platen press that, although they have the best possible contact with the press platen 3, they have no contact with the bridge members 4.
  • heat-expansion openings 7, 8 and 15 are provided in the rib members and bridge members.
  • the bridge members 4 and 16 extend to the left and to the right hand sides across the effective compression surface region and form extensions 17.
  • Spacers 12, through an interposition or pressure-distribution plates 14, are mounted on these extensions 17 in such a manner that, in cooperation with the extensions of the individual crossbeams 2, they define, with the aid of spacer plates 13, the desired press gap.
  • the spacer plates 13 bear upon spacer supports 12 and are thus removed from the soiled region of the compressed material plane.
  • Heatable single or multilevel platen press for the manufacture of wood composition panels or the like, comprising a stationary base structure and a hydraulically displaceable structure, each of said structures being composed of a plurality of individual bridge members and rib members interconnecting said bridge members and forming conjointly therewith a grid-like crossbeam extending over the entire width of the press, said crossbearn having a relatively large moment of inertia and being of such dimensions as to transmit the entire compressive force of said structures; press platens loosely mounted on said grid at the workpieceside thereof, said rib members having fluid circulation passages for. equalizing longitudinal thermal tensions, and said bridge members having fluid circulation passages for equalizing transverse thermal tensions.
  • Heatable platen press according to claim 1, wherein said press platen, said bridge members and said n'b members are formed with a plurality of bores located in rows disposed one above the other in a plane.
  • said bridge members and said rib members extend perpendicularly to said press platens.
  • Heatable platen press according to claim 1 having a neutral axis, and wherein said rib members are divided in two and are formed of counter-heating rib members and operatively heating rib members for separating the heat flow about the neutral axis.
  • Heatable platen press having a neutral axis, including heat expansion openings formed in said bridge members and in said rib members and symmetrically disposed about the neutral axis.
  • Heatable platen press having a neutral axis, and wherein said rib members are divided in two and are formed ,of counter-heating rib members and operatively heating rib members for separatingthe heat flow about the neutral axis, the bores formed in the bridge members adjacent said pressplatens being combined into a controllable circulatory loop, and the bores formed in said press platens, the bores formed in the remainder of said bridge members and .the bores forrned in said rib members fonning a safety circulatory loop for operative heating, said rib members having a temperature-several degrees centigrade higher, than the temperature of said bridge members which are subjected to the circulatory loop a for counter-heating.
  • Heatable platen press according to claim 12 wherein said bridge members are shaped according to the course of the stress by the bending moment, and
  • Heatable platen press according to claim 13 wherein said trapezoidal section of said bridge members are formed with bores extending-at an angle to the horizontal.
  • Heatable platen press according to claim 14 wherein the bores formed in said trapezoidal sections are combined into an individual circulatoryloop.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Press Drives And Press Lines (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Veneer Processing And Manufacture Of Plywood (AREA)
US67412A 1969-08-27 1970-08-27 Heating platen press Expired - Lifetime US3685932A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1943560A DE1943560C3 (de) 1969-08-27 1969-08-27 Heizplattenpresse

Publications (1)

Publication Number Publication Date
US3685932A true US3685932A (en) 1972-08-22

Family

ID=5743918

Family Applications (1)

Application Number Title Priority Date Filing Date
US67412A Expired - Lifetime US3685932A (en) 1969-08-27 1970-08-27 Heating platen press

Country Status (5)

Country Link
US (1) US3685932A (fr)
BE (1) BE755021A (fr)
DE (1) DE1943560C3 (fr)
FI (1) FI56138C (fr)
FR (1) FR2059280A5 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3775033A (en) * 1970-07-24 1973-11-27 Dieffenbacher Gmbh Heating platen press
US4046500A (en) * 1974-07-08 1977-09-06 Maschinenfabrik J. Dieffenbacher & Co. Press spar for heated panel press
US5158132A (en) * 1989-03-20 1992-10-27 Gerard Guillemot Zone-regulated high-temperature electric-heating system for the manufacture of products made from composite materials
US5824246A (en) * 1991-03-29 1998-10-20 Engineered Composites Method of forming a thermoactive binder composite
US20060103052A1 (en) * 1991-03-29 2006-05-18 Reetz William R Method of forming a thermoactive binder composite
CN105382912A (zh) * 2015-09-07 2016-03-09 广东华凯科技股份有限公司 一种用于高密度纤维板生产的热压机
US20160144588A1 (en) * 2013-06-19 2016-05-26 Bruderer Ag Method for warping the machine bed and/or the press ram of a punching press and punching press

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL9100302A (nl) * 1991-02-20 1992-09-16 Ebm Techniek Bv Inrichting voor het plaatselijk vervormen van kunststof panelen.

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB714544A (en) * 1951-08-01 1954-09-01 Rommler G M B H H Hydraulic press for the manufacture of platelike bodies
US2699325A (en) * 1950-09-27 1955-01-11 Hedin Borje Vilhelm Press-plate for wallboard presses and the like
DE1033223B (de) * 1954-12-10 1958-07-03 Maschf Augsburg Nuernberg Ag Praegepresse zum Herstellen von Matrizen und Druckplatten aus Kunststoffen
US2874751A (en) * 1956-03-13 1959-02-24 Thermel Inc Temperature controlled press
US2973790A (en) * 1959-04-23 1961-03-07 Herbert Van Huellen Multi-stage presses
US3241189A (en) * 1961-06-29 1966-03-22 Siempelkamp Eugen Temperature-controlled press
GB1048767A (en) * 1962-09-04 1966-11-16 Iby Ludwig Improvements in and relating to a heatable press plate
US3315304A (en) * 1963-01-30 1967-04-25 Gerrit Jan Van Elten Apparatus for manufacturing light weight building boards
US3396783A (en) * 1966-04-28 1968-08-13 Siempelkamp Eugen Temperature-controlled press platen

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2699325A (en) * 1950-09-27 1955-01-11 Hedin Borje Vilhelm Press-plate for wallboard presses and the like
GB714544A (en) * 1951-08-01 1954-09-01 Rommler G M B H H Hydraulic press for the manufacture of platelike bodies
DE1033223B (de) * 1954-12-10 1958-07-03 Maschf Augsburg Nuernberg Ag Praegepresse zum Herstellen von Matrizen und Druckplatten aus Kunststoffen
US2874751A (en) * 1956-03-13 1959-02-24 Thermel Inc Temperature controlled press
US2973790A (en) * 1959-04-23 1961-03-07 Herbert Van Huellen Multi-stage presses
US3241189A (en) * 1961-06-29 1966-03-22 Siempelkamp Eugen Temperature-controlled press
GB1048767A (en) * 1962-09-04 1966-11-16 Iby Ludwig Improvements in and relating to a heatable press plate
US3315304A (en) * 1963-01-30 1967-04-25 Gerrit Jan Van Elten Apparatus for manufacturing light weight building boards
US3396783A (en) * 1966-04-28 1968-08-13 Siempelkamp Eugen Temperature-controlled press platen

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3775033A (en) * 1970-07-24 1973-11-27 Dieffenbacher Gmbh Heating platen press
US4046500A (en) * 1974-07-08 1977-09-06 Maschinenfabrik J. Dieffenbacher & Co. Press spar for heated panel press
US5158132A (en) * 1989-03-20 1992-10-27 Gerard Guillemot Zone-regulated high-temperature electric-heating system for the manufacture of products made from composite materials
US5824246A (en) * 1991-03-29 1998-10-20 Engineered Composites Method of forming a thermoactive binder composite
US20060103052A1 (en) * 1991-03-29 2006-05-18 Reetz William R Method of forming a thermoactive binder composite
US20160144588A1 (en) * 2013-06-19 2016-05-26 Bruderer Ag Method for warping the machine bed and/or the press ram of a punching press and punching press
CN105382912A (zh) * 2015-09-07 2016-03-09 广东华凯科技股份有限公司 一种用于高密度纤维板生产的热压机

Also Published As

Publication number Publication date
FI56138B (fi) 1979-08-31
DE1943560C3 (de) 1975-07-03
DE1943560A1 (de) 1971-03-18
BE755021A (fr) 1971-02-01
FR2059280A5 (fr) 1971-05-28
FI56138C (fi) 1979-12-10
DE1943560B2 (de) 1974-10-17

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