Presses – With additional treatment of material – Heating – cooling – or drying
Patent
1997-12-05
2000-01-04
Gerrity, Stephen F.
Presses
With additional treatment of material
Heating, cooling, or drying
100154, 100310, 100312, 1565835, 425371, B30B 506, B30B 1534
Patent
active
060098031
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a double band press for making and/or coating plate-shaped or web-shaped workpieces of all types, wherein the material to be pressed passes through a reaction zone between opposing band strands of two endless continuous-loop press bands, with pressure and heat applied to the material in the reaction zone, and wherein in the reaction zone, there is associated with each band strand at least one pressure chamber which is open on the side facing the band segment, with the pressure chamber including wraparound seals supported by the band strands and bounded on the side facing away from the band strand by a pressure plate and provided with pressure rolls supported on the band strand.
SUMMARY OF THE INVENTION
It is the object of the invention to enable in the reaction zone of the double band press an adjustment of the pressure load of the web-shaped or plate-shaped workpiece advancing through the press, and of the intensity of the heat transfer or the heat removal over a relatively large range in dependence on the product.
This object is solved in accordance with the invention by arranging between the pressure rolls and the pressure plate bearing rollers associated with the pressure rolls, by having a liquid pressure-transmitting medium flow turbulently in a short circulatory loop through the pressure chamber and through a heating unit or cooling unit located outside the pressure chamber, and by allowing adjustment of the operating pressure of the liquid pressure-transmitting medium or the velocity of the liquid pressure-transmitting medium in the pressure chamber for changing the intensity of the heat transfer.
The pressure applied to the workpiece in the region of the reaction zone of the double band press is defined by both the pressing rolls located in the pressure chamber or pressure chambers and the operating pressure of the liquid pressure-transmitting medium.
Since the liquid pressure-transmitting medium flows turbulently through the pressure chamber, the heat transfer from the heated pressure medium or cold transfer from the cooled pressure-transmitting medium onto the working strand of the press band and thus onto the workpiece is significantly improved in comparison to a laminar flow. The intensity of the heat supply to the workpiece or of the heat removal from the workpiece can be increased significantly by increasing the operating pressure or the velocity of the liquid pressure-transmitting medium. Consequently, the construction of the pressure chamber according to the invention makes it technically feasible to precisely adjust the pressure load and heat load individually for each workpiece in the reaction zone, i.e. in accordance with the technical problems encountered during the pressing operation.
The applied pressure and the supplied heat or amount of cooling can be regulated further by constructing the pressure chamber from several cassettes, wherein each cassette further comprises pressure rolls and bearing rollers rotatably supported in a frame, by providing a turbulent flow of a heated or cooled liquid pressure-transmitting medium through the pressure chamber, and by making it possible to individually adjust the operating pressure of the liquid pressure-transmitting medium in each cassette by adjustment means 4.2 shown in FIG. 4.
Additional features of the invention form the subject matter of the dependent claims.
BRIEF DESCRIPTION OF THE DRAWING
Exemplified embodiments of the invention are illustrated in the drawings, in which:
FIG. 1 shows schematically a pressure chamber associated with the working strand of a continuous press band;
FIG. 2 is a modification of the embodiment of FIG. 1, and
FIG. 3 is a diagram showing the pressure of the liquid pressure-transmitting medium in the pressure chamber plotted on the abscissa and the value of the heat transfer coefficient plotted on the ordinate.
FIG. 4 shows schematically a pressure chamber constructed from several cassettes with means for adjusting the velocity of the pressure-transmit
REFERENCES:
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patent: 3795470 (1974-03-01), De Mats
patent: 4311550 (1982-01-01), Kerttula
patent: 4485733 (1984-12-01), Held
patent: 4494648 (1985-01-01), Held
patent: 5200129 (1993-04-01), Kobayashi et al.
patent: 5558016 (1996-09-01), De Brock
Patent Abstracts of Japan, vol. 012, No. 257 (M-719) Jul. 20, 1988, 63-39309, Feb. 1988.
Pankoke Werner
Rottger Rolf
Feiereisen Henry M.
Firma Theodor Hymmen
Gerrity Stephen F.
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