US3594867A

US3594867A - Heating platen press

Info

Publication number: US3594867A
Authority: US
Inventors: Heinrich Pfeiffer
Original assignee: Dieffenbacher GmbH Maschinen und Anlagenbau
Current assignee: Dieffenbacher GmbH Maschinen und Anlagenbau
Priority date: 1967-10-28
Filing date: 1968-10-25
Publication date: 1971-07-27
Anticipated expiration: 1988-07-27
Also published as: SE346946B

Abstract

A heating platen press for manufacturing composition board, such as chipboard, shavings board, and the like. The press includes a stationary base unit and a movable press unit which respectively have working, heating platens directed toward each other and respectively provided with parallel working faces. These units are each composed of a box structure which includes, in addition to the heating platen, an opposed cover plate and longitudinal bracer bridges which extend between and engage the cover plate and heating platen. The heating platen and cover plate of each unit are formed with channels for conveying a temperaturecontrolling fluid therethrough, so that the entire unit can be heated and cooled. Each longitudinal bracer bridge has at least one row of such channels extending longitudinally through the bracer bridges.

Description

O United States Patent [113,594,867

[72] Inventor Heinrich Pfeiffer 2,765,587 10/1956 Skerntt l. 18/17 PUX Eppingen/Baden, Germany 3,241,189 3/1966 Siempelkamp v l. 100/93 P 312%? Primary Examiner-H. A. Kilby,.lr.

Altorney.r-Curt M. Avery, Arthur E. Wilfond, Herbert L. [45] Paenmd July 1971 Lerner and Daniel J Tick [73] Assignee J. Diefienbacher G.m.b.l-{.

Maschinenfabrik Eppingen/Baden, Germany [32] Priority Oct. 28, 1967 [33] Germany [3x] I P 53 1854 ABSTRACT: A heating platen press for manufacturing composition board. such as chipboard, shavings board, and the [54] HEATING PLATEN PRESS like, The press includes a stationary base unit and a movable 27 Claims43 Drawing Figs. press unit which respectively have work ng, heatlrrg platens directed toward each other and respectively provided with [52] U-S-Cl 18/17, arana] working faee5 These units are each composed of a 100/93, 83/700, 269/3 box structure which includes, in addition to the heating platen, [5 I] ll!!- an oppesed cover plate and longitudinal bracer bridges which Fleld Of Search 7 P, extend between and engage the cover plate and heating Hi 83/699, 700; 100/93 295; 269/3131 platen. The heating platen and cover plate of each unit are 314 formed with channels for conveying a temperature-controlling [56] References Cited fluid therethrough, so that the entire unit can be heated and cooled. Each longitudinal bracer bridge has at least one row of UNITED STATES PATENTS such channels extending longitudinally through the bracer 269/313 bridges.

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SHEET 03 nr 20 PATENTEUJUALZYIHH' Y I 3,594,867

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PATENTED JUL27 197i 3 I 594- 8 6 7 sum 13 gr 2Q Fig. 22

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Fig. 28

Claims

1. In a heating plaTen press for manufacturing composition board, a stationary base unit and a movable press unit respectively having heating platens with respective parallel working faces opposite each other, said units each being composed of a box structure including, in addition to said heating platen, an opposed cover plate and longitudinal bracer bridges extending between and engaging said cover plate and said heating platen, said heating platen and cover plate and said longitudinal bracer bridges of each unit being formed with channels for conveying a temperature-controlling fluid therethrough, so that the entire unit can be heated and cooled, at least one row of said channels extending longitudinally through said bracer bridges.

2. The combination of claim 1, wherein at least two rows of said channels are situated in respective planes parallel to and differently spaced from said working face of said platen.

3. The combination of claim 1 wherein both the heating platen and the cover plate of each unit are provided with at least two rows of said channels situated in different respective planes parallel to said working face of each unit.

4. The combination of claim 3 wherein channels of said cover plate and bracer bridges together with said channels of said platen form at least one heating-fluid circuit, said circuit forming a heat reservoir of the entire mass of the box structure of each unit so that the heat of said reservoir is available for the press operations, and each platen forming a heating zone in which the channels thereof are connected into said circuit for counterflow of the fluid so as to pass the stored heat from said reservoir to said heating zone.

5. The combination of claim 4 wherein each platen has the channels in the row nearest to said working face thereof forming a primary fluid-flow circuit, a secondary circuit means, the channels of the other row of each platen together with the channels of said cover plate being parallel connected in said secondary circuit means, said channels of said bracer bridges forming two fluid-flow loops parallel connected in said secondary circuit means.

6. In the combination of claim 5, each unit defining a neutral plane situated midway between and extending parallel to the platen and cover plate thereof, said channels of said longitudinal bracer bridges being situated on both sides of said neutral plane, said row of channels of said heating platen of each unit nearest to said working face thereof forming said primary circuit, said secondary circuit means comprising a first and a second secondary circuit, said first secondary circuit including the other row of channels of said heating platen together with the channels of said bracer bridges on the same side of said neutral plane as said heating platen, said second secondary circuit including the channels of said cover plate and the channels of said bracer bridges on the same side of said neutral plane as said cover plate.

7. The combination of claim 5 wherein the row of channels of said heating platen nearest to said working face thereof are connected in series with the row of channels of said cover plate in said primary circuit, the other row of channels of said heating platen of each unit forming part of said secondary circuit means which has individual heating loops including respective channels of said longitudinal bracer bridges.

8. The combination of claim 7 wherein the row of channels of the heating platen of each unit closest to said working face of said platen forms part of said primary circuit, the second row of each heating platen together with said bracer bridge channels on the same side of said neutral plane forming a first heating loop, said covering plate having a second row of channels connected in parallel with said heating loop, a second heating loop comprising the bracer bridge channels on the other side of said neutral plane and forming therewith a first secondary circuit, the other row of channels of said cover plate forming a second secondary circuit.

9. In the combination of claim 1, each unit defining midway between its heating platen and cover plate a neutral plane parallel to said heating platen and cover plate, said rows of channels of said platen forming a primary circuit, said cover plate of each unit having a pair of rows of channels which form a secondary circuit, said longitudinal bracer bridge channels being located above and below respectively said neutral plane, a secondary circuit having respective heating loops parallel connected with said bracer bridge channels above and below said plane respectively.

10. In the combination of claim 3, each unit defining a neutral plane situated midway between and extending parallel to the heating platen and cover plate thereof, said longitudinal bracer bridge channels being situated on both sides of said neutral plane, the row of channels of said platen nearest to said working face thereof forming part of said primary circuit, a first secondary circuit, the other row of channels of said platen together with the bridge channels on the same side of said neutral plane as said platen forming a heating loop of said first secondary circuit, a second secondary circuit, said cover plate of each unit having a row of channels connected with the channels of said bridges on the same side of said neutral plane as said cover plate to form a heating loop of said second secondary circuit.

11. In the combination of claim 1, each unit defining a neutral plane situated midway between and extending parallel to the heating platen and cover plate of each unit, said cover plate having a pair of rows of said channels respectively situated in planes located at different distances from the working face of said platen, said bracer bridge channels being situated on both sides respectively of said neutral plane, a primary circuit, the row of channels of said platen nearest said working face thereof together with one of the rows of channels of said cover plate being connected in said primary circuit, a secondary circuit, the other rows of channels of said platen and cover plate being connected in said secondary circuit, and said bracer bridge channels on opposite sides of said neutral plane being situated in respective two heating loops which are parallel connected with said secondary circuit.

12. The combination of claim 1 wherein the rows of channels of said platen form a pair of heating loops which start at side edges of the platen and which alternately include channels of both rows.

13. The combination of claim 1 wherein said interconnected rows of channels form a primary circuit, the cover plate of each unit also being formed with a pair of rows of channels interconnected in the same way as the channels of said platen of each unit and forming a secondary circuit.

14. The combination of claim 13 wherein said channels form a pair of heating loops for supplying to at least one edge region of each heating platen a greater amount of heat than to the remainder of the platen.

15. The combination of claim 1, wherein the channels of each heating platen form a fluid circuit having outlets, and means responsive to the temperature of the fluid at said outlets for controlling the temperature of each unit.

16. The combination of claim 1 wherein said channels form part of primary and secondary heating circuits, and said primary heating circuit having an amount of heat greater than that of said secondary circuit by the extent to which heat is lost from the heating platen by radiation and withdrawal of heat to the material being worked.

17. The combination of claim 16 comprising means for additionally heating the four corners of said heating platen for reducing heat losses at said corners.

18. A heating platen press for manufacturing composition board, a stationary base unit and a movable press unit respectively having heating platens with respectively parallel working faces opposite each other, each of said units being composed of a plurality of box structures, each box structure inclUding, in addition to said heating platen, an opposed cover plate and longitudinal bracer bridges extending between and engaging said cover plate and said heating platen, said heating plate and cover plate of each unit having at least two rows of channels for temperature-controlling fluid, said channel rows being differently spaced from said working face, said plurality of box structures being arranged in a row with all of said longitudinal bracer bridges parallel to each other and situated one after the other along said latter row from one box structure to the next, a pair of cylinder-and-piston assemblies coacting with each of said movable press units respectively, and a plurality of fastening means passing through said bracer bridges and rigidly securing a plurality of said box structures together into an assembly forming one of said units.

19. The combination of claim 18, comprising wedge means between and coactive with each pair of successive box structures of each unit for adjusting the box structures so that the working faces of the platens are in a common plane and for transmitting forces between the adjoining box structures.

20. The combination of claim 18, comprising spacer plates of large area for determining the thickness of the work material, spacer members which carry said spacer plates and have the same area size as said plates, said spacer members being situated beyond the pressing region of the platens, working pistons operatively connected with each movable press unit for displacing the latter, and said spacer plates respectively having center points situated in planes perpendicular to the axis of said piston.

21. The combination of claim 20 wherein one of said spacer members is provided for each of said cylinder-and-piston units respectively and is carried by the stationary box structures of the stationary base unit.

22. The combination of claim 20 comprising a pair of tension columns operatively connected with each movable press unit, the surface area of each spacer plate and spacer member having a length corresponding to the distance between said columns, said surface area being at least as great as the area of the pressing surface of said working piston.

23. The combination of claim 20 wherein pressure-distributing plates are situated between and operatively connected with each movable and stationary unit for transmitting the pressure therebetween, said distributing plates respectively being situated along the axes of said pistons which act on the movable unit whereby the pressure is transmitted through said pressure-distributing plates from said movable unit to said stationary unit, and said distributing plates carrying protective plates situated in line with said spacer plates and spacer members.

24. The combination of claim 1 wherein the ratio between the height of each of said longitudinal bracer bridges of a box structure with respect to the width of the effective working face thereof is smaller than 1:1.8.

25. The combination of claim 24 wherein each of said longitudinal bracer bridges is formed with an operating opening as well as with thermal expansion openings, each box structure having a neutral plane extending parallel to and situated between said platen and cover plate thereof, and said thermal expansion openings being situated on both sides of said neutral plane.

26. The combination of claim 25 wherein each box structure includes transverse ribs of rectangular configuration formed with cutouts at the four corners thereof and having thermal expansion openings on both sides of said neutral plane.

27. The combination of claim 26 wherein a press unit includes only a single box structure having more than four of said longitudinal bracer bridges and corresponding transverse ribs and having walls operatively connected with more than two cylinder-and-piston assemblies for providing the pressing force.