CA2062876C - Continuously operating press - Google Patents
Continuously operating pressInfo
- Publication number
- CA2062876C CA2062876C CA002062876A CA2062876A CA2062876C CA 2062876 C CA2062876 C CA 2062876C CA 002062876 A CA002062876 A CA 002062876A CA 2062876 A CA2062876 A CA 2062876A CA 2062876 C CA2062876 C CA 2062876C
- Authority
- CA
- Canada
- Prior art keywords
- press
- platens
- roll
- continuously operating
- heated
- 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 - Fee Related
Links
Classifications
-
- 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
- B30B5/065—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 using anti-friction means for the pressing band
- B30B5/067—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 using anti-friction means for the pressing band using anti-friction roller 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
- B27N3/24—Moulding or pressing characterised by using continuously acting presses having endless belts or chains moved within the compression zone
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/44—Compression means for making articles of indefinite length
- B29C43/48—Endless belts
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (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)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
Abstract
The invention relates to a continuously operating press for the production of chipboard, fibreboard, plastic material boards, plywood boards of the like. The press is provided with flexible, endless steel belts , which transfer the press pressure and also draw the material to be pressed through the press. The belts are guided over drive drums and guide drums around the press table and press ram and which are supported, with an adjustable press gap, on heater plates of the press table and the press ram on roller rods which are guided with their axes transverse to the direction of advance of the belts. The roller rods roll on the heating plates provided on the press table and the press ram. The press has heater plates, the ends of which have a straight interface connection and the passages of which extend parallel to the longitudinal direction of the press, the passages being connected to several differently heatable heating areas.
Description
2Q~~~~16 CONTINUOUSLY OPERATING PRESS
The invention relates to a continuously operating press for the production of chipboard, fibreboard, and plywood sheets, of the type disclosed in German Patent no. 40 l0 308.
For continuously operating presses of this kind, heating plate systems are known, from German Patent no. 37 43 933, in which heating zones are formed, transversely to the direction of feed of the press material, by longitudinal passages, whereby a varying temperature profile can be controlled.
Thus, for example, by increased temperature in the middle of the heating plate, a better vapour removal from a press material by increased vapour pressure from the interior to the exterior, and a specifically central heat supply into the press material during the production of narrow chipboard, can be achieved. On changing over from wide chipboard to narrow chipboard, the energy consumption is thereby smaller and the dishing effect of the steel belt (varying thermal heat extension) can also be balanced out.
However, the heating plates are also the rolling supports for the roller rods. For that reason, the transitions are made correspondingly toothed. The transitions of the three heating plates are also arranged with a gap, adapted for thermal expansion. Partly increased surface pressings in the transition region from one heating plate to the next heating plate are thereby produced for the roller rods, the acceptable specific surface pressure for the compression of the chip cake being further minimized, particularly in the high pressure region of the press, so that, partly in this region, only transition pressures in the range of about 30 atmospheres are acceptable. However, pressures up to 50 atmospheres are required technologically. By the fan-shaped, zigzag transitions in the transition region, furthermore, very high production costs arise in the manufacture of the installation connections of the longitudinally bored heating plates.
The purpose and reason of the longitudinally bored heating plates according to Patent no. 37 43 933 are to be able to produce narrower chipboard because of the specifically central heat supply. In addition, the advantage of utilizing 2~~28~~
higher compression pressures can also be used, for boards with high (sawdust) density, because of the narrower width.
However, because of the limited allowable specific pressures, this is not utilizable. In practical operation in continuous presses, the use of such heating plates has the effect that a strong abrasion of the supporting surfaces is produced, even after short service periods of about 3,000 - 6,000 hours.
This abrasion results not so much in a general removal of the support surfaces, but it forms, in the through-direction, at approximately the spacing of the roller rods, corresponding transverse grooves (with wave crests and wave valleys). In association therewith, increased running noises occur which, as the abrasion increases, lead to critical oscillations in the entire press system.
According to the main Patent no. 40 10 308, the last-mentioned disadvantages are avoided by the provision, at the roller surfaces of the heating plates, of roller plates having a thickness of 7 - 23 mm and a Brinell hardness of 250 or greater, the roller plates being heat treated on both sides for two-sided use, and/or through-hardened and having a precision finish, and a plurality of roller plates being arranged in succession, separated from one another by expansion gaps, with saw-tooth connections. It is to be noted as an advantage of the main patent that, by the increased surface hardness of the roller plates, an ideal rolling support for the roller rods is produced. Since no wear occurs at the surface, as in the case of a support directly against the heating plates, an increased life expectancy for the roller rods themselves is also to be expected. The faultless rolling of the roller rods on the roller plates also encourages an exact control of the path of the steel belt.
Under the effect of hydraulic pressure forces, a partially topographically increased surface peak pressure in the vicinity of 250 atmospheres can be produced, i. e. with the hardened roller plates according to the main patent, the press system is fully functional with respect to an economically advantageous useful life.
"'"' 3 The invention is based on the problem of so further developing the press according to the main patent that, with increased temperature in the longitudinal middle of the press surface, a varying temperature profile can be controlled, that no increased production costs arise in the manufacture of the longitudinally bored heating plates and that the advantages wh~.ch hold true for the main patent remain completely maintained.
According to one aspect of the invention, there is provided, a continuously operating press for the production of chipboard, fibreboard, plastic material boards, plywood boards of the like, with flexible, endless steel belts, which transfer the press pressure and also draw the material to be pressed through the press, guided over drive drums and guide drums around the press table and press ram and which are supported, with an adjustable press gap, on heater plates of the press table and the press ram on roller rods which are guided with their axes transverse to the direction of advance of the belts, the roller rods rolling on heating plates provided on the press table and the press ram, according to Patent 4,010,308, characterized by heater plates (11) the ends (20) of which have a straight interface connection and the passages (16) of which extend parallel to the longitudinal direction of the press, the passages (16) being connected to a plurality of differently heatable heating areas (I to VI) .
According to another aspect of the invention there is provided a continuously operating press comprising: a press table; a press ram facing said press table and defining an adjustable pressing gap therebetween; first and second flexible endless steel bands which transfer a pressing pressure to and draw a material to be pressed through said adjustable gap; driving drums and deflecting drums which drive said first and second endless steel bands around said press table and said press ram, respectively; rolling bars which support said endless steel bands and which move with said endless steel bands, said rolling bars being disposed °
'"' 3 a with their axes being transverse to the running direction of said steel bands and extending over the entire working area of said press; heated platens attached to said press table and press ram, respectively, said rolling bars rolling on said heated platens, said heated platens having end surfaces which are connected to one another via straight butt joints, said heated platens having bore holes formed therein which extend parallel to the longitudinal direction of said press and which are independently heatable to provide a plurality of heating surfaces in each of said heated platens; roll platens at least partially covering said heated platens and extending over the entire working area of said press, said roll platens having a thickness in a range of 7 mm to 23 mm and a Brinell hardness of 250, said roll platens being heat treated on opposite surfaces, said roll platen surfaces having a precision ground finish; and expansion joints joining said roll platens and extending obliquely relative to the running direction of said steel bands.
In a combination of the solutions according to German Patent 37 43 933 and German Patent 40 10 308, the above-mentioned disadvantages are avoided and compensated according to the invention, in an advantageous manner.
Further useful features of the subject matter of the invention are described below.
With reference to the drawing, an exemplary embodiment of the press according to the invention is described in greater detail. In the drawings:
Figure 1 shows a schematic illustration of a continuously operating press in side view;
Figure 2 shows a portion "G" of the press according to Figure 1:
Figure 3 shows a plan view "X" of two rolling plates according to Figure 2;
Figure 4 shows a temperature-time-path diagram with a temperature profile; and Figure 5 shows the heating areas of the press table and the press ram without the rolling plates.
According to Figure 1, the continuously operating press comprises the press table 2, the movable press ram 3 and cables (not shown) connecting these. For adjusting the gap 4, the press ram 3 is moved upwardly and downwardly by hydraulic piston-cylinder arrangements (not shown) and is held in the selected position. The steel belts 5 and 6 are guided by respective drive drums 7 and 8 and guide drums 9 and 10 around the press table 2 and the press ram 3. For the reduction of friction between the heating plates 11 provided on the press table 2 and press ram 3 and the moving steel belts 5 and 6, respective roller rod mats, which are likewise moving, are formed of roller rods 1. The roller rods 1, the axes of which extend transverse to the direction of movement of the belts, are connected together at both longitudinal sides of the press in guide chains 12 at predetermined spacings and are guided through the press on the heating plates 11 of the press ram 3 and the press table 2, on one side, and also on the steel belts 5 and 6, rolling from the steel belts.
Figures 2 and 3 show in a section D-D a portion G from Figure 1, by which the,provision of the roller plates 13 on the heating plates 11 of the press table 2 is illustrated. The roller plates 12 are also bolted by means of connecting bolts 14 and 18 to the heating plates 13. In the direction of throughput, at the beginning the roller plates 13 are fixed by means of securing bolts 15 as a fixed point to the heating plates 11. The transition from one roller plate 13 to another are formed as saw-tooth connections 19 and can be made as trapezoidal or round arches., an expansion gap 17 also being notable as a compensation for heat expansion.
2~fi2~ ~ ~
s Figures 4 and 5 show the press areas comprising the heating plate 11 at the inlet, the heating plate 11' at the middle and the heating plate 11 " at the press outlet. As shown in the temperature-time-path diagram of Figure 4, the temperature profile is formed from the heat energy jump in the heating zone a at the inlet, the decreasing temperature in the heating zone b and the heating zone c at the outlet with a lower temperature. In order to be able to control a temperature profile transverse to the longitudinal direction of the heating plates 11, 11' and 11 " , or the longitudinal direction of a continuously operating press, the heat transfer passages 16 are arranged in the longitudinal direction, the heat transfer passages 16 arranged in the longitudinal direction being distributed in different heat areas I to VI, i. e. each individual heating area I to VI can be differently adjusted, e. g. to a temperature level F. The width of the press material passing through is indicated by e.
By a hydraulic and/or electrical control device, through temperature sensors on the heating plates 11, 11' and 11" and a size dependent on the width a of the press material, the temperature level F can be controlled by switching or connection of individual heating areas I to VI or by the introduction of temperature media at different temperatures into the heat transfer passages 16 of the heating plate 11, i.
e. a temperature profile F with a temperature increasing from the longitudinal sides B-B to the longitudinal centre A-A can be developed. The temperature supply to the heat transfer passages 16 arranged in the longitudinal direction of the press is effected in the heating plates 11, 11' and 11 "
through the ducts 21 on the side facing the steel belts 5 and 6 perpendicular to the heating plate surface of this rear side. In this way, the necessary heat energy can be deliberately supplied only in the region of the press material width e, whereby, as already described above, belt undulations are avoided and at the same time heat energy is saved since little radiant heat is lost.
According to the invention, the heater pate 11 located under or above the roller plate 13 can be made without saw-tooth connections in the interface 20 between the individual heating zones a, b and c. By the straight interface 20, as already illustrated in figures 2 and 3, the heating plates 11 can be made relatively simply in the return 22 of the heating medium. The supply and discharge ducts 21 are arranged from the exterior, perpendicular to the heating plate 11 at the plate interface edge 20 in a simple manner. In combination with the roller plate 13, the heating plates do not require to be connected by welding - as previously usual - in the transitions, i. e. between a and b or b and c in the region of the interface edges if no fan-shaped transitions have to be utilized. The temperature sensing, through the flat interface 20, in particular in the transition zones, is to be effected substantially more exactly since the transition region is considerably smaller, i. e. in summary a temperature sensing transverse to and along the heating plated is more exactly obtained.
The invention relates to a continuously operating press for the production of chipboard, fibreboard, and plywood sheets, of the type disclosed in German Patent no. 40 l0 308.
For continuously operating presses of this kind, heating plate systems are known, from German Patent no. 37 43 933, in which heating zones are formed, transversely to the direction of feed of the press material, by longitudinal passages, whereby a varying temperature profile can be controlled.
Thus, for example, by increased temperature in the middle of the heating plate, a better vapour removal from a press material by increased vapour pressure from the interior to the exterior, and a specifically central heat supply into the press material during the production of narrow chipboard, can be achieved. On changing over from wide chipboard to narrow chipboard, the energy consumption is thereby smaller and the dishing effect of the steel belt (varying thermal heat extension) can also be balanced out.
However, the heating plates are also the rolling supports for the roller rods. For that reason, the transitions are made correspondingly toothed. The transitions of the three heating plates are also arranged with a gap, adapted for thermal expansion. Partly increased surface pressings in the transition region from one heating plate to the next heating plate are thereby produced for the roller rods, the acceptable specific surface pressure for the compression of the chip cake being further minimized, particularly in the high pressure region of the press, so that, partly in this region, only transition pressures in the range of about 30 atmospheres are acceptable. However, pressures up to 50 atmospheres are required technologically. By the fan-shaped, zigzag transitions in the transition region, furthermore, very high production costs arise in the manufacture of the installation connections of the longitudinally bored heating plates.
The purpose and reason of the longitudinally bored heating plates according to Patent no. 37 43 933 are to be able to produce narrower chipboard because of the specifically central heat supply. In addition, the advantage of utilizing 2~~28~~
higher compression pressures can also be used, for boards with high (sawdust) density, because of the narrower width.
However, because of the limited allowable specific pressures, this is not utilizable. In practical operation in continuous presses, the use of such heating plates has the effect that a strong abrasion of the supporting surfaces is produced, even after short service periods of about 3,000 - 6,000 hours.
This abrasion results not so much in a general removal of the support surfaces, but it forms, in the through-direction, at approximately the spacing of the roller rods, corresponding transverse grooves (with wave crests and wave valleys). In association therewith, increased running noises occur which, as the abrasion increases, lead to critical oscillations in the entire press system.
According to the main Patent no. 40 10 308, the last-mentioned disadvantages are avoided by the provision, at the roller surfaces of the heating plates, of roller plates having a thickness of 7 - 23 mm and a Brinell hardness of 250 or greater, the roller plates being heat treated on both sides for two-sided use, and/or through-hardened and having a precision finish, and a plurality of roller plates being arranged in succession, separated from one another by expansion gaps, with saw-tooth connections. It is to be noted as an advantage of the main patent that, by the increased surface hardness of the roller plates, an ideal rolling support for the roller rods is produced. Since no wear occurs at the surface, as in the case of a support directly against the heating plates, an increased life expectancy for the roller rods themselves is also to be expected. The faultless rolling of the roller rods on the roller plates also encourages an exact control of the path of the steel belt.
Under the effect of hydraulic pressure forces, a partially topographically increased surface peak pressure in the vicinity of 250 atmospheres can be produced, i. e. with the hardened roller plates according to the main patent, the press system is fully functional with respect to an economically advantageous useful life.
"'"' 3 The invention is based on the problem of so further developing the press according to the main patent that, with increased temperature in the longitudinal middle of the press surface, a varying temperature profile can be controlled, that no increased production costs arise in the manufacture of the longitudinally bored heating plates and that the advantages wh~.ch hold true for the main patent remain completely maintained.
According to one aspect of the invention, there is provided, a continuously operating press for the production of chipboard, fibreboard, plastic material boards, plywood boards of the like, with flexible, endless steel belts, which transfer the press pressure and also draw the material to be pressed through the press, guided over drive drums and guide drums around the press table and press ram and which are supported, with an adjustable press gap, on heater plates of the press table and the press ram on roller rods which are guided with their axes transverse to the direction of advance of the belts, the roller rods rolling on heating plates provided on the press table and the press ram, according to Patent 4,010,308, characterized by heater plates (11) the ends (20) of which have a straight interface connection and the passages (16) of which extend parallel to the longitudinal direction of the press, the passages (16) being connected to a plurality of differently heatable heating areas (I to VI) .
According to another aspect of the invention there is provided a continuously operating press comprising: a press table; a press ram facing said press table and defining an adjustable pressing gap therebetween; first and second flexible endless steel bands which transfer a pressing pressure to and draw a material to be pressed through said adjustable gap; driving drums and deflecting drums which drive said first and second endless steel bands around said press table and said press ram, respectively; rolling bars which support said endless steel bands and which move with said endless steel bands, said rolling bars being disposed °
'"' 3 a with their axes being transverse to the running direction of said steel bands and extending over the entire working area of said press; heated platens attached to said press table and press ram, respectively, said rolling bars rolling on said heated platens, said heated platens having end surfaces which are connected to one another via straight butt joints, said heated platens having bore holes formed therein which extend parallel to the longitudinal direction of said press and which are independently heatable to provide a plurality of heating surfaces in each of said heated platens; roll platens at least partially covering said heated platens and extending over the entire working area of said press, said roll platens having a thickness in a range of 7 mm to 23 mm and a Brinell hardness of 250, said roll platens being heat treated on opposite surfaces, said roll platen surfaces having a precision ground finish; and expansion joints joining said roll platens and extending obliquely relative to the running direction of said steel bands.
In a combination of the solutions according to German Patent 37 43 933 and German Patent 40 10 308, the above-mentioned disadvantages are avoided and compensated according to the invention, in an advantageous manner.
Further useful features of the subject matter of the invention are described below.
With reference to the drawing, an exemplary embodiment of the press according to the invention is described in greater detail. In the drawings:
Figure 1 shows a schematic illustration of a continuously operating press in side view;
Figure 2 shows a portion "G" of the press according to Figure 1:
Figure 3 shows a plan view "X" of two rolling plates according to Figure 2;
Figure 4 shows a temperature-time-path diagram with a temperature profile; and Figure 5 shows the heating areas of the press table and the press ram without the rolling plates.
According to Figure 1, the continuously operating press comprises the press table 2, the movable press ram 3 and cables (not shown) connecting these. For adjusting the gap 4, the press ram 3 is moved upwardly and downwardly by hydraulic piston-cylinder arrangements (not shown) and is held in the selected position. The steel belts 5 and 6 are guided by respective drive drums 7 and 8 and guide drums 9 and 10 around the press table 2 and the press ram 3. For the reduction of friction between the heating plates 11 provided on the press table 2 and press ram 3 and the moving steel belts 5 and 6, respective roller rod mats, which are likewise moving, are formed of roller rods 1. The roller rods 1, the axes of which extend transverse to the direction of movement of the belts, are connected together at both longitudinal sides of the press in guide chains 12 at predetermined spacings and are guided through the press on the heating plates 11 of the press ram 3 and the press table 2, on one side, and also on the steel belts 5 and 6, rolling from the steel belts.
Figures 2 and 3 show in a section D-D a portion G from Figure 1, by which the,provision of the roller plates 13 on the heating plates 11 of the press table 2 is illustrated. The roller plates 12 are also bolted by means of connecting bolts 14 and 18 to the heating plates 13. In the direction of throughput, at the beginning the roller plates 13 are fixed by means of securing bolts 15 as a fixed point to the heating plates 11. The transition from one roller plate 13 to another are formed as saw-tooth connections 19 and can be made as trapezoidal or round arches., an expansion gap 17 also being notable as a compensation for heat expansion.
2~fi2~ ~ ~
s Figures 4 and 5 show the press areas comprising the heating plate 11 at the inlet, the heating plate 11' at the middle and the heating plate 11 " at the press outlet. As shown in the temperature-time-path diagram of Figure 4, the temperature profile is formed from the heat energy jump in the heating zone a at the inlet, the decreasing temperature in the heating zone b and the heating zone c at the outlet with a lower temperature. In order to be able to control a temperature profile transverse to the longitudinal direction of the heating plates 11, 11' and 11 " , or the longitudinal direction of a continuously operating press, the heat transfer passages 16 are arranged in the longitudinal direction, the heat transfer passages 16 arranged in the longitudinal direction being distributed in different heat areas I to VI, i. e. each individual heating area I to VI can be differently adjusted, e. g. to a temperature level F. The width of the press material passing through is indicated by e.
By a hydraulic and/or electrical control device, through temperature sensors on the heating plates 11, 11' and 11" and a size dependent on the width a of the press material, the temperature level F can be controlled by switching or connection of individual heating areas I to VI or by the introduction of temperature media at different temperatures into the heat transfer passages 16 of the heating plate 11, i.
e. a temperature profile F with a temperature increasing from the longitudinal sides B-B to the longitudinal centre A-A can be developed. The temperature supply to the heat transfer passages 16 arranged in the longitudinal direction of the press is effected in the heating plates 11, 11' and 11 "
through the ducts 21 on the side facing the steel belts 5 and 6 perpendicular to the heating plate surface of this rear side. In this way, the necessary heat energy can be deliberately supplied only in the region of the press material width e, whereby, as already described above, belt undulations are avoided and at the same time heat energy is saved since little radiant heat is lost.
According to the invention, the heater pate 11 located under or above the roller plate 13 can be made without saw-tooth connections in the interface 20 between the individual heating zones a, b and c. By the straight interface 20, as already illustrated in figures 2 and 3, the heating plates 11 can be made relatively simply in the return 22 of the heating medium. The supply and discharge ducts 21 are arranged from the exterior, perpendicular to the heating plate 11 at the plate interface edge 20 in a simple manner. In combination with the roller plate 13, the heating plates do not require to be connected by welding - as previously usual - in the transitions, i. e. between a and b or b and c in the region of the interface edges if no fan-shaped transitions have to be utilized. The temperature sensing, through the flat interface 20, in particular in the transition zones, is to be effected substantially more exactly since the transition region is considerably smaller, i. e. in summary a temperature sensing transverse to and along the heating plated is more exactly obtained.
Claims (11)
1. A continuously operating press comprising:
a press table;
a press ram facing said press table and defining an adjustable pressing gap therebetween;
first and second flexible endless steel bands which transfer a pressing pressure to and draw a material to be pressed through said adjustable gap;
driving drums and deflecting drums which drive said first and second endless steel bands around said press table and said press ram, respectively;
rolling bars which support said endless steel bands and which move with said endless steel bands, said rolling bars being disposed with their axes being transverse to the running direction of said steel bands and extending over the entire working area of said press;
heated platens attached to said press table and press ram, respectively, said rolling bars rolling on said heated platens, said heated platens having end surfaces which are connected to one another via straight butt joints, said heated platens having bore holes formed therein which extend parallel to the longitudinal direction of said press and which are independently heatable to provide a plurality of heating surfaces in each of said heated platens;
roll platens at least partially covering said heated platens and extending over the entire working area of said press, said roll platens having a thickness in a range of 7 mm to 23 mm and a Brinell hardness of 250, said roll platens being heat treated on opposite surfaces, said roll platen surfaces having a precision ground finish; and expansion joints joining said roll platens and extending obliquely relative to the running direction of said steel bands.
a press table;
a press ram facing said press table and defining an adjustable pressing gap therebetween;
first and second flexible endless steel bands which transfer a pressing pressure to and draw a material to be pressed through said adjustable gap;
driving drums and deflecting drums which drive said first and second endless steel bands around said press table and said press ram, respectively;
rolling bars which support said endless steel bands and which move with said endless steel bands, said rolling bars being disposed with their axes being transverse to the running direction of said steel bands and extending over the entire working area of said press;
heated platens attached to said press table and press ram, respectively, said rolling bars rolling on said heated platens, said heated platens having end surfaces which are connected to one another via straight butt joints, said heated platens having bore holes formed therein which extend parallel to the longitudinal direction of said press and which are independently heatable to provide a plurality of heating surfaces in each of said heated platens;
roll platens at least partially covering said heated platens and extending over the entire working area of said press, said roll platens having a thickness in a range of 7 mm to 23 mm and a Brinell hardness of 250, said roll platens being heat treated on opposite surfaces, said roll platen surfaces having a precision ground finish; and expansion joints joining said roll platens and extending obliquely relative to the running direction of said steel bands.
2. The continuously operating press as claimed in claim 1, wherein said roll platens have a thickness in the range of 12 to 18 mm.
3. The continuously operating press as claimed in claim 1, further comprising a sawtoothed expansion joint, and wherein a plurality of roll platens are arranged adjacent to each other and separated by said sawtoothed expansion joint.
4. The continuously operating press as claimed in claim 3, further comprising a screw connection which allows for thermal expansion and which anchors said roll platens to said heated platens.
5. The continuously operating press as claimed in claim 4, further comprising fixing bolts which firmly fasten said roll platens to said heated platens as a fixed point, said fixing bolts being located near an end of the roll platens which is nearest to where said material to be pressed enters said adjustable gap.
6. The continuously operating press as claimed in claim 1, further comprising a screw connection which allows for thermal expansion and which anchors said roll platens to said heated platens.
7. The continuously operating press as claimed in claim 1, further comprising fixing bolts which firmly fasten said roll platens to said heated platens as a fixed point, said fixing bolts being located near an end of the roll platens which is nearest to where said material to be pressed enters said adjustable gap.
8. The continuously operating press as claimed in claim 1, wherein said heating surfaces of each of said heated platens are heated to a temperature level which decreases from a central region surrounding a longitudinal center line of
9 said press to longitudinal sides of said press, said temperature level in said central region of said press being substantially equal over a width which corresponds to the width of an article being pressed.
9. The continuously operating press as claimed in claim 1, wherein each of said heated platens has a pressing surface, said pressing surfaces of said heated platens being arranged in succession on said press table and said press ram and being divided into a plurality of heating zones, each of which is selectively supplied with different amounts of thermal energy.
9. The continuously operating press as claimed in claim 1, wherein each of said heated platens has a pressing surface, said pressing surfaces of said heated platens being arranged in succession on said press table and said press ram and being divided into a plurality of heating zones, each of which is selectively supplied with different amounts of thermal energy.
10. The continuously operating press as claimed in claim 9, wherein longitudinal ends of said heating zones abut one another.
11. The continuously operating press as claimed in claim 8, wherein said heating surfaces have feeder and discharge openings formed therein which are provided at said butt joints and which accommodate heat-transfer media.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19914107833 DE4107833C2 (en) | 1990-03-30 | 1991-03-12 | Continuously working press |
| DEP4107833.0 | 1991-03-12 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2062876A1 CA2062876A1 (en) | 1992-09-13 |
| CA2062876C true CA2062876C (en) | 1999-08-17 |
Family
ID=6427019
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002062876A Expired - Fee Related CA2062876C (en) | 1991-03-12 | 1992-03-12 | Continuously operating press |
Country Status (4)
| Country | Link |
|---|---|
| CA (1) | CA2062876C (en) |
| FI (1) | FI95006C (en) |
| IT (1) | IT1267100B1 (en) |
| SE (1) | SE506795C2 (en) |
-
1992
- 1992-02-27 SE SE9200585A patent/SE506795C2/en not_active IP Right Cessation
- 1992-03-10 FI FI921044A patent/FI95006C/en active
- 1992-03-10 IT IT92MI000542A patent/IT1267100B1/en active IP Right Grant
- 1992-03-12 CA CA002062876A patent/CA2062876C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| FI95006B (en) | 1995-08-31 |
| FI95006C (en) | 1995-12-11 |
| CA2062876A1 (en) | 1992-09-13 |
| SE9200585L (en) | 1992-09-13 |
| ITMI920542A0 (en) | 1992-03-10 |
| FI921044A0 (en) | 1992-03-10 |
| SE506795C2 (en) | 1998-02-09 |
| ITMI920542A1 (en) | 1993-09-10 |
| FI921044A (en) | 1992-09-13 |
| SE9200585D0 (en) | 1992-02-27 |
| IT1267100B1 (en) | 1997-01-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |