CA1293107C - Apparatus or treating a web of material - Google Patents
Apparatus or treating a web of materialInfo
- Publication number
- CA1293107C CA1293107C CA000547047A CA547047A CA1293107C CA 1293107 C CA1293107 C CA 1293107C CA 000547047 A CA000547047 A CA 000547047A CA 547047 A CA547047 A CA 547047A CA 1293107 C CA1293107 C CA 1293107C
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Abstract
ABSTRACT
The invention relates to a device for the treatment of a material, in particular a web or material or pulp, which is made to pass between at least two endless, permeable belts, for instance screen belts or the like conveying means, in particular for the displacement washing of a filter cake or for washing fibrous matter, the material being made to pass between the belts along containers serving for the introduction or discharge of a treatment medium, for instance a wash liquid. The main object is to save energy and surface space requirement in the washing of filter cakes or the like, to reduce the production expenditure for such treatment devices and to increase the washing effect.
This is achieved according to the invention by providing, in particular for a gravity countercurrent treatment, conveniently a gravity displacement washing, for the treatment containers to be superimposed, in particular approximately vertically, and for the belts with the material lodged therebetween being made to pass ascendingly around and between the treatment containers in a loopshaped or undulating path, the material being conveyed by the belts first to the lowermost treatment container and the treatment liquid, for instance fresh water, first being led to the topmost container, conveniently under pressure, and the treatment containers provided on the side facing the upper side of the belts or the material, in particular on the underside of the containers, with openings for feeding or conveying of the treatment liquid to the belts or the material or to other treatment containers positioned underneath.
The invention relates to a device for the treatment of a material, in particular a web or material or pulp, which is made to pass between at least two endless, permeable belts, for instance screen belts or the like conveying means, in particular for the displacement washing of a filter cake or for washing fibrous matter, the material being made to pass between the belts along containers serving for the introduction or discharge of a treatment medium, for instance a wash liquid. The main object is to save energy and surface space requirement in the washing of filter cakes or the like, to reduce the production expenditure for such treatment devices and to increase the washing effect.
This is achieved according to the invention by providing, in particular for a gravity countercurrent treatment, conveniently a gravity displacement washing, for the treatment containers to be superimposed, in particular approximately vertically, and for the belts with the material lodged therebetween being made to pass ascendingly around and between the treatment containers in a loopshaped or undulating path, the material being conveyed by the belts first to the lowermost treatment container and the treatment liquid, for instance fresh water, first being led to the topmost container, conveniently under pressure, and the treatment containers provided on the side facing the upper side of the belts or the material, in particular on the underside of the containers, with openings for feeding or conveying of the treatment liquid to the belts or the material or to other treatment containers positioned underneath.
Description
~L293~0~
The invention relates to a device for the treatment of a material, in particular a web of material or pulp, which is made to pass between at leas-t two endless, permeable belts, for ins-tance screen belts or the like conveying means, in particular for the displacement washing of a filter cake or for washing fibrous matter, the ma-terial being made to pass be-tween -the belts, convenien-tly after passing a pressure æone, advantageously a ~edge zone, alony containers serving for the introduction or discharge of a treatment medium, for instance a wash liquid, a bleaching agent or other chemicals, whereupon the material is optionally conveyed to a pressing zone and said containers optionally being arranged in series one behind the other and advantageously being connected to inlet or outlets for various treatment medla, for instance water and/or bleaching chemicals, optionally of various parameters or values of state, for instance various concentrations or various pressures. The known screen belt presses, in particular double screen belt presses, normally have a considerable surface space requirement. Their energy consumption is also relatively high, particularly if vacuum treatment boxes are provided along the screen belts.
The disadvantages indicated above are eliminated according to the invention by providing, in particular for a gravity countercurrent treatment, conveniently a gravity displacement washing, for the treatment conkainers to be superimposed, in particular approximately vertically, and for the belts with the material lodged therebetween being made to pass ascendingly around the and between the treatmen-t containers in a loopshaped or undulating pa-th, the material being conveyed by the belts first to the ~3~)7 lowermost treatment container and the treatment liquid, e.g. fresh wa-ter, first being fed to the topmost container, conveniently under pressure, and the treatment containers provided on the side facing the upper side of the belts or the material, in particular on the underside of the containers, with openings for feeding or conveying of the treatment liquid to the belts or to the material or to o-ther treatment contai.ners positioned underneath. The embodiment according to the invention has the advantage that by using the force of gravity for the displacement washing or the like, the energy requirement i.s particularly low and -the plant is greatly simplified by the e].imination of additional equipment such as pumps and control. means; by arranging the treatment containers in a superimposed way, the surface space requirement of the plant is kept particularl~ low. Added to this is a high degree of coverage of up to more than 98 percent, a low dilution factor of for instance less than a maximum of 1 and, above all, low foaming.
By arranging the treatment containers preferably vertically superimposed, -they are conveniently open or provided with openings on the side facing the underside of the belts or the material, in particular on top or in the upper area, for discharging or conveying the treatment l.iquid.
For reducing the surface area requirement, the treatment containers are combined with particular advantage into a container tower, with passages for the belts and the material lodged therebetween provided between superimposed containers. The undersides of the treatment con-tainers or the said passages can be curved convexly or concavely, -the adjacent container walls constituting a guide for the belts.
)7 According to a further embodimen-t of the invention, a particularly effective washing, scrubbing or the like is obtained if optionally driven guide rolls, press rolls, press nips or the like are arranged laterally of the treatment containers or the container tower, the belts with the material being made to pass around them or in them, -the belts possibly being connected to the preceding or following treatment container in relation to -the moving direction of the belts or the material.
Advan-tageously, the material, in particu1ar a filter cake or the fibrous matter to be washed, is first introduced into the passage between the lowermost container and the next higher container by means of the belts, conveniently over guide rolls, optionally through press nips, and is subsequently passed ascendingly in loops or the like. By the repeated deflection thus obtained, a particular pressing effect is achieved, the total effectiveness of the washing or scrubbing process is increased and the fresh water consumption is reduced. Press nips and S-shaped screen belts guide paths over appropriately arranged rolls can further increase such effects.
A practical embodiment can be characterized in that the topmost treatment container is formed as a pressure shoe with a perforated bottom curved downwards to the bel-ts passed therealong and the material lodged therebe-tween, in which corltainer the treatment liquid, due to the height of this topmost container, is under static pressure or, by connection to a pump, under super pressure. At least a portion of the bottoms of the treatment containers can be curved ascendingly from bottom to top following the respectively adjacent part Gf the ascending belt or material loop, in particular parallel thereto. In connection with the treatment liquid arriving or ..~
~;~93~
flowing onto the belts and the ma-terial under more or less pressure, the friction of -the belts on the underside of the containers is considerably reduced in this way. The curvature can be asymmetrical, but also symmetrical in relation tc) the cen-tral axis of the container.
Particularly if -the superimposed treatment con-taine:rs are staggered (offset) in relation -to one another, optionally driven, guide rolls are provided for conveying the belts and the material from the respective lower container to the respective higher container in order -to assure proper guidance of the belts. In such cases, but also in the case of vertically superimposed containers, lateral col.lecting vats or the like connected to -the respective container are provided with particular advantage underneath the guide rolls, press roll.s, press nips or the like and attached to the, for instance, offset, treatment container arranged underneath. The endless, permeable belts are for instance perforated steel belts or screen bel.ts made of plastic material whose ends are connected in a suitable manner, for instance by welding, weaving or inserting.
The arrangement according to the invention results in an essentially improved and essentiall.y better controllable treatment of the material by means of the treatment medium. The result is a better utilization of the respective treatment medium and thus the possibility of an essentially more compact layout of the plant, e.g. a treatment module of a common device.
: A further result is the essentially reduced friction of the belts on the flanges and bottoms of the treatment containers.
The invention is explained by means of two exemplary embodiments under reference to the accompanying drawing. Fig. 1 shows a tower~like double screen scrubber in lateral view. Fig~. 2 and 3 are detailed views of modified embodimen-ts.
The material 1, in particular a pulp cake, is introduced between the belts 2 and 3 and passed ascendingly in loops or undulations from bot-tom -to top. These loops are passed ascendingly around and between the treatment container(s) 4 to 10. For this purpose, guide rolls 1l. to 18 are provided and passages 19 to 24 are kept free between the containers, with the belts 2, 3 and -the material 1 lodged therebetween sliding or made to pass, in particular for further guidance, along the undersides 25 to 30 of the containers 5 to 10. By the washing liquid or other treatment media passed under more or less pressure through these bottoms provided with opeings to the belts and the material, the belts and the material are slightly pressed away from these bottoms or at least the friction between bottoms and screen belts is reduced.
Under use of gravi-ty, the wash water is passed through the material 1 in the countercurrent process by damming up in wash boxes 5 to 10, an additional washing effect being obtained in the deflection zones (rolls 13 to 18) by squeezing the material 1. As evident from the detail in Fig. 2, press nips 31, 32 could be used instead of the guide rolls 12 to 18 or pressure rolls, although not all the rolls 12 to 18 need be replaced by press nips or the like.
Advantageously, the wash water is passed under pressure through the containers S to 10 arranged in the individual loops and formed as washing shoes in this case. I-t should be mentioned tha-t chemicals, 1~93~
such as for b]eaching, can be used instead o~ -the wash water. The pressure men-tioned can be applied as static pressure, for instance by making the container lO of appropriate height (:in particular exceeding the height shown), and by taking care, in particular during operation, that the container is nearly comple-tely filled with the treatment medium, for instance water.
In this case, the treatment con-tainers are vertically superimposed. Bu-t they ean al.so be s-taggered or offset in re:lation to one another in a horizonta:L direction, additional guide rolls possibly being required in this case.
A special stand 33 permits the tower-like eonstruction of this embodiment. The water and other treatment liquid flowing off -the defleetion or press rolls ll to 18 and the press nips 31, 32 is eollected by means of collecting vats 34 to 38 or the like eonneeted to the respeetive, for instance offset, container positioned undernea-th to which -they are laterally attached. The treatment liquid thus flows back into the eontainers 5 to 9. The eontainers 4 to 9 are eompletely open on top in this ease, while -the container bottoms 25 to 30 ean be partially elosed, in partieular provided with openings in the otherwise elosed bottom in order to obtain a damming effect of the treatment liquid. This is particularly impor-tant if special pressure is to be exerted on the belts, for instanee by conneeting the belt lO to a pressure pump or by providing it with inereased height in eomparison to the height shown in Fig. l.
It is evident that the passages 39 to 44 provided between the eontainers and ascending in moving direction and the bottoms 25 to 30 of the !~`
~293~ 7 containers 5 to 10 are curved downwards or concave, the adjacent container walls possibly serving as guides for the belts.
It is further eviden-t that the ma-terial, in particular a filter cake or the fibrous matter to be washed, is first made to pass, by means of the bel-ts 2, 3, conveniently over guide rolls 11, 12, optionally through press nips, into the passage 39 between the lowermost container 4 and the next hiyher con~tainer 5 and subsequently in loops or the like fur-ther upwards.
It is evident that the -topmost container 1~ is formed as a pressure shoe wi-th a perforated bottom 30 curved downwards to the belts 2, 3 passed therealong and the material 1 lodged therebetween, in which container the treatment liquid, as a result of the increased heiyht of this topmost container, is under static pressure or, by means of connection to a pump, under superpressureO As represented, at least a part o~ the treatment container bottoms 25 to 30 is curved ascendingly from bottom to top Eollowing the respective adjacent portion of the ascending bel-t or material loop, in particular curved paralle:L in relation thereto. But in special cases, it is conceivable to form at least part of the treatment container bottoms curved symmetrically in relation to the central axis of the containers.
The material 1 to be washed is introduced below at 45 and passed to the washing means via a wedge zone 46. After passing the washing means, the treated material, in particular the washed pulp, is discharged from the space between the belts 2, 3 into the collecting vat 47.
The guide rolls or the press nips a:re conveniently at least partially driven, in order to distribute or reduce the traction on the belts.
i2~307 _9~
Fiy. 3 shows a detail of a further embodiment according to the invention. The lateral walls of treatment containers 5 to 10 are quadrangular, in particu]ar approximately rectangular, with approximately plane upper boundary 101 and/or lower boundary 102 as well as vertical lateral boundaries 103, 104. On the sides of the trea-tment containers or of the conta~ner -tower, optionally driven guide rolls, press rolls, press nips or the like are provided, namely, at least two such ro:L:Ls or the like 109, 110 or 111, 112 for each treatment container in the area of i-ts vertical lateral boundaries or walls 103 or 104 at the rectanyle corners 105, 106 or 107, 108. The advantage o~ such embodlments is that the containers can take up a comparatively large amount of treatment liquid.
Lateral walls of different quadrangular shape, for instance trapeze shape, in connection with -two or more rolls or the like at the vertical boundaries in question, are conceivable and of advantage for selected cases of applicat~ion, for instance for the reduction of the construction height.
In summarizing, the following is to be emphasized: In the vertical double screen machine according to the invention, a material predehydrated to about 10 to 40, in particular about 12 percent, is passed upwards in one or several loops and the wash water is made to pass through the material downwards in countercurrent through open wash boxes. The deflection results in a squeezing effect increasing the total effectiveness of the washing operation and reducing the use of fresh water (diluting factor!).
The deflection zones can also be formed with several S-shaped rolls or, as mentioned above, with one or more press nips (Fig. 2!).
~2~3~
The main advantage of this embodiment according to the invention resides mainly in the fact that by relying on the force of gravity for the displacement washing, the energy requirement is very low and the plant is of very simple construction due -to the el.imination of additional equipmen-t such as pumps and control means.
.,; ,~
~ ~ .
The invention relates to a device for the treatment of a material, in particular a web of material or pulp, which is made to pass between at leas-t two endless, permeable belts, for ins-tance screen belts or the like conveying means, in particular for the displacement washing of a filter cake or for washing fibrous matter, the ma-terial being made to pass be-tween -the belts, convenien-tly after passing a pressure æone, advantageously a ~edge zone, alony containers serving for the introduction or discharge of a treatment medium, for instance a wash liquid, a bleaching agent or other chemicals, whereupon the material is optionally conveyed to a pressing zone and said containers optionally being arranged in series one behind the other and advantageously being connected to inlet or outlets for various treatment medla, for instance water and/or bleaching chemicals, optionally of various parameters or values of state, for instance various concentrations or various pressures. The known screen belt presses, in particular double screen belt presses, normally have a considerable surface space requirement. Their energy consumption is also relatively high, particularly if vacuum treatment boxes are provided along the screen belts.
The disadvantages indicated above are eliminated according to the invention by providing, in particular for a gravity countercurrent treatment, conveniently a gravity displacement washing, for the treatment conkainers to be superimposed, in particular approximately vertically, and for the belts with the material lodged therebetween being made to pass ascendingly around the and between the treatmen-t containers in a loopshaped or undulating pa-th, the material being conveyed by the belts first to the ~3~)7 lowermost treatment container and the treatment liquid, e.g. fresh wa-ter, first being fed to the topmost container, conveniently under pressure, and the treatment containers provided on the side facing the upper side of the belts or the material, in particular on the underside of the containers, with openings for feeding or conveying of the treatment liquid to the belts or to the material or to o-ther treatment contai.ners positioned underneath. The embodiment according to the invention has the advantage that by using the force of gravity for the displacement washing or the like, the energy requirement i.s particularly low and -the plant is greatly simplified by the e].imination of additional equipment such as pumps and control. means; by arranging the treatment containers in a superimposed way, the surface space requirement of the plant is kept particularl~ low. Added to this is a high degree of coverage of up to more than 98 percent, a low dilution factor of for instance less than a maximum of 1 and, above all, low foaming.
By arranging the treatment containers preferably vertically superimposed, -they are conveniently open or provided with openings on the side facing the underside of the belts or the material, in particular on top or in the upper area, for discharging or conveying the treatment l.iquid.
For reducing the surface area requirement, the treatment containers are combined with particular advantage into a container tower, with passages for the belts and the material lodged therebetween provided between superimposed containers. The undersides of the treatment con-tainers or the said passages can be curved convexly or concavely, -the adjacent container walls constituting a guide for the belts.
)7 According to a further embodimen-t of the invention, a particularly effective washing, scrubbing or the like is obtained if optionally driven guide rolls, press rolls, press nips or the like are arranged laterally of the treatment containers or the container tower, the belts with the material being made to pass around them or in them, -the belts possibly being connected to the preceding or following treatment container in relation to -the moving direction of the belts or the material.
Advan-tageously, the material, in particu1ar a filter cake or the fibrous matter to be washed, is first introduced into the passage between the lowermost container and the next higher container by means of the belts, conveniently over guide rolls, optionally through press nips, and is subsequently passed ascendingly in loops or the like. By the repeated deflection thus obtained, a particular pressing effect is achieved, the total effectiveness of the washing or scrubbing process is increased and the fresh water consumption is reduced. Press nips and S-shaped screen belts guide paths over appropriately arranged rolls can further increase such effects.
A practical embodiment can be characterized in that the topmost treatment container is formed as a pressure shoe with a perforated bottom curved downwards to the bel-ts passed therealong and the material lodged therebe-tween, in which corltainer the treatment liquid, due to the height of this topmost container, is under static pressure or, by connection to a pump, under super pressure. At least a portion of the bottoms of the treatment containers can be curved ascendingly from bottom to top following the respectively adjacent part Gf the ascending belt or material loop, in particular parallel thereto. In connection with the treatment liquid arriving or ..~
~;~93~
flowing onto the belts and the ma-terial under more or less pressure, the friction of -the belts on the underside of the containers is considerably reduced in this way. The curvature can be asymmetrical, but also symmetrical in relation tc) the cen-tral axis of the container.
Particularly if -the superimposed treatment con-taine:rs are staggered (offset) in relation -to one another, optionally driven, guide rolls are provided for conveying the belts and the material from the respective lower container to the respective higher container in order -to assure proper guidance of the belts. In such cases, but also in the case of vertically superimposed containers, lateral col.lecting vats or the like connected to -the respective container are provided with particular advantage underneath the guide rolls, press roll.s, press nips or the like and attached to the, for instance, offset, treatment container arranged underneath. The endless, permeable belts are for instance perforated steel belts or screen bel.ts made of plastic material whose ends are connected in a suitable manner, for instance by welding, weaving or inserting.
The arrangement according to the invention results in an essentially improved and essentiall.y better controllable treatment of the material by means of the treatment medium. The result is a better utilization of the respective treatment medium and thus the possibility of an essentially more compact layout of the plant, e.g. a treatment module of a common device.
: A further result is the essentially reduced friction of the belts on the flanges and bottoms of the treatment containers.
The invention is explained by means of two exemplary embodiments under reference to the accompanying drawing. Fig. 1 shows a tower~like double screen scrubber in lateral view. Fig~. 2 and 3 are detailed views of modified embodimen-ts.
The material 1, in particular a pulp cake, is introduced between the belts 2 and 3 and passed ascendingly in loops or undulations from bot-tom -to top. These loops are passed ascendingly around and between the treatment container(s) 4 to 10. For this purpose, guide rolls 1l. to 18 are provided and passages 19 to 24 are kept free between the containers, with the belts 2, 3 and -the material 1 lodged therebetween sliding or made to pass, in particular for further guidance, along the undersides 25 to 30 of the containers 5 to 10. By the washing liquid or other treatment media passed under more or less pressure through these bottoms provided with opeings to the belts and the material, the belts and the material are slightly pressed away from these bottoms or at least the friction between bottoms and screen belts is reduced.
Under use of gravi-ty, the wash water is passed through the material 1 in the countercurrent process by damming up in wash boxes 5 to 10, an additional washing effect being obtained in the deflection zones (rolls 13 to 18) by squeezing the material 1. As evident from the detail in Fig. 2, press nips 31, 32 could be used instead of the guide rolls 12 to 18 or pressure rolls, although not all the rolls 12 to 18 need be replaced by press nips or the like.
Advantageously, the wash water is passed under pressure through the containers S to 10 arranged in the individual loops and formed as washing shoes in this case. I-t should be mentioned tha-t chemicals, 1~93~
such as for b]eaching, can be used instead o~ -the wash water. The pressure men-tioned can be applied as static pressure, for instance by making the container lO of appropriate height (:in particular exceeding the height shown), and by taking care, in particular during operation, that the container is nearly comple-tely filled with the treatment medium, for instance water.
In this case, the treatment con-tainers are vertically superimposed. Bu-t they ean al.so be s-taggered or offset in re:lation to one another in a horizonta:L direction, additional guide rolls possibly being required in this case.
A special stand 33 permits the tower-like eonstruction of this embodiment. The water and other treatment liquid flowing off -the defleetion or press rolls ll to 18 and the press nips 31, 32 is eollected by means of collecting vats 34 to 38 or the like eonneeted to the respeetive, for instance offset, container positioned undernea-th to which -they are laterally attached. The treatment liquid thus flows back into the eontainers 5 to 9. The eontainers 4 to 9 are eompletely open on top in this ease, while -the container bottoms 25 to 30 ean be partially elosed, in partieular provided with openings in the otherwise elosed bottom in order to obtain a damming effect of the treatment liquid. This is particularly impor-tant if special pressure is to be exerted on the belts, for instanee by conneeting the belt lO to a pressure pump or by providing it with inereased height in eomparison to the height shown in Fig. l.
It is evident that the passages 39 to 44 provided between the eontainers and ascending in moving direction and the bottoms 25 to 30 of the !~`
~293~ 7 containers 5 to 10 are curved downwards or concave, the adjacent container walls possibly serving as guides for the belts.
It is further eviden-t that the ma-terial, in particular a filter cake or the fibrous matter to be washed, is first made to pass, by means of the bel-ts 2, 3, conveniently over guide rolls 11, 12, optionally through press nips, into the passage 39 between the lowermost container 4 and the next hiyher con~tainer 5 and subsequently in loops or the like fur-ther upwards.
It is evident that the -topmost container 1~ is formed as a pressure shoe wi-th a perforated bottom 30 curved downwards to the belts 2, 3 passed therealong and the material 1 lodged therebetween, in which container the treatment liquid, as a result of the increased heiyht of this topmost container, is under static pressure or, by means of connection to a pump, under superpressureO As represented, at least a part o~ the treatment container bottoms 25 to 30 is curved ascendingly from bottom to top Eollowing the respective adjacent portion of the ascending bel-t or material loop, in particular curved paralle:L in relation thereto. But in special cases, it is conceivable to form at least part of the treatment container bottoms curved symmetrically in relation to the central axis of the containers.
The material 1 to be washed is introduced below at 45 and passed to the washing means via a wedge zone 46. After passing the washing means, the treated material, in particular the washed pulp, is discharged from the space between the belts 2, 3 into the collecting vat 47.
The guide rolls or the press nips a:re conveniently at least partially driven, in order to distribute or reduce the traction on the belts.
i2~307 _9~
Fiy. 3 shows a detail of a further embodiment according to the invention. The lateral walls of treatment containers 5 to 10 are quadrangular, in particu]ar approximately rectangular, with approximately plane upper boundary 101 and/or lower boundary 102 as well as vertical lateral boundaries 103, 104. On the sides of the trea-tment containers or of the conta~ner -tower, optionally driven guide rolls, press rolls, press nips or the like are provided, namely, at least two such ro:L:Ls or the like 109, 110 or 111, 112 for each treatment container in the area of i-ts vertical lateral boundaries or walls 103 or 104 at the rectanyle corners 105, 106 or 107, 108. The advantage o~ such embodlments is that the containers can take up a comparatively large amount of treatment liquid.
Lateral walls of different quadrangular shape, for instance trapeze shape, in connection with -two or more rolls or the like at the vertical boundaries in question, are conceivable and of advantage for selected cases of applicat~ion, for instance for the reduction of the construction height.
In summarizing, the following is to be emphasized: In the vertical double screen machine according to the invention, a material predehydrated to about 10 to 40, in particular about 12 percent, is passed upwards in one or several loops and the wash water is made to pass through the material downwards in countercurrent through open wash boxes. The deflection results in a squeezing effect increasing the total effectiveness of the washing operation and reducing the use of fresh water (diluting factor!).
The deflection zones can also be formed with several S-shaped rolls or, as mentioned above, with one or more press nips (Fig. 2!).
~2~3~
The main advantage of this embodiment according to the invention resides mainly in the fact that by relying on the force of gravity for the displacement washing, the energy requirement is very low and the plant is of very simple construction due -to the el.imination of additional equipmen-t such as pumps and control means.
.,; ,~
~ ~ .
Claims (14)
1. A device for the treatment of a material, in particular a web of material or pulp, which is made to pass between at least two endless, permeable belts, for instance screen belts or the like conveying means, in particular for the displacement washing of a Filter cake or for washing fibrous matter, the material being made to pass between the belts, conveniently after passing a pressure zone, advantageously a wedge zone, along containers serving for the introduction or discharge of a treatment medium, for instance a wash liquid, a bleaching agent or other chemicals, whereupon the material is optionally conveyed to a pressing zone and said containers optionally being arranged in series one behind the other and -advantageously being connected to inlets or outlets for various treatment media, for instance water and/or bleaching chemicals, optionally of various parameters or values of state, for instance various concentrations or various pressures, characterized in that , in particular for a gravity counter- current treatment, conveniently a gravity displacement washing, the treatment containers are superimposed, in particular approximately vertically, and the belts with the material lodged therebetween are made to pass ascendingly around the and between the treatment containers in a loop-shaped or undulating path, the material being conveyed by the belts first to the lowermost treat-ment container and the treatment liquid, for instance fresh water, first being fed to the topmost treatment container, conveniently under pressure, and that the treatment containers are provided on the side facing the upper side of the belts or the material, in particular on the underside of the con-tainers, with openings for feeding or conveying of the treatment liquid to the belts or to the material or to further treatment containers positioned underneath.
2. The device according to claim 1, wherein the treatment containers serving for the discharge or conveyance of the treatment liquid are open or provided with openings on the side Facing the underside of the belts or the material, in particular on top or in the upper area.
3. The device according to claim 1, wherein the -treatment containers are combined into a container tower, with passages for the belts and the material lodged therebetween provided superimposed containers,
4. The device according to claim 3, wherein the said passages are curved upwards or concave, the adjacent container walls constituting a guide For -the belts.
5. The device according to claim 1, wherein the underside of the treatment containers is convex and their upper side is concave.
6. The device according to claim 1, wherein optionally driven guide rolls, press rolls, press nips or the like are arranged laterally of the treatment containers or the container tower, the belts with the material being made to pass around them or in them, the belt possibly being connected to the preceding or following treatment container in relation of the moving direction of the belts or the material.
7. The device according to claim 1, wherein the material (1), in particular a filter cake or the fibrous matter to be washed, is first introduced into the passage (39) between the lowermost container (4) and the next highest container (5) by means of the belts (2,3), conveniently over guide rolls (11, 12), optionally through press nips, and is subsequently passed further on ascendingly in loops or the like.
8. The device according to claim 1, wherein the topmost treatment container (19) is formed as a pressure shoe with a perforated bottom (30) curved downwards to the belts (2,3) passed therealong and the material (1) lodged therebetween, in which container the treatment liquid, due to the height of this topmost container, is under static pressure or, by connection to a pump, under superpressure.
9. The device according to claim 1, wherein at least a portion of the bottoms of the treatment containers (25 to 30) is curved ascendingly from bottom to top following the respectively adjacent part of the ascending belt or material loop, in particular parallel thereto.
10. The device according to claim 1, wherein at least a portion of the bottoms of the treatment containers is curved symmetrically in relation to the central axis of the containers.
11. The device according to claim 1, wherein superimposed treatment containers are offset or staggered in relation to one another, optionally driven guide rolls being provided for conveying the belts and the material from the respective lower container to the respective upper container.
12. The device according to claims 6, 7, 8, 9, 10, or 11, wherein lateral collecting vats (34', 34 to 38) or the like connected to the respective container are provided underneath the guide rolls, press rolls, press nips or the like and attached to the, for instance offset, treatment container arranged underneath.
13. The device according to claims 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, or 11, wherein the lateral walls of the treatment containers (5 to 10) are approximately trapeze-shaped with concavely curved upper boundary, convexly curved lower boundary as well as vertical lateral boundaries. (Fig. 1).
14. The device according to claims 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, or 11, wherein the lateral walls of the treatment containers (5 to 10) are quadrangular, in particular approximately rectangular,with approximately plane upper (101) and/or lower (102) boundary as well as vertical lateral boundaries (103, 104), optionally driven guide rolls, press rolls, press nips or the like being provided laterally of the treatment containers or the container tower, namely, at least two of such rolls or the like (109, 110 or 111, 112) For each treatment container in the area of its verticallateral boundaries or walls (103 or 104) at the rectangle corners (105, 106 or 107, 108).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000547047A CA1293107C (en) | 1986-09-17 | 1987-09-16 | Apparatus or treating a web of material |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ATA2489/86 | 1986-09-17 | ||
| CA000547047A CA1293107C (en) | 1986-09-17 | 1987-09-16 | Apparatus or treating a web of material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1293107C true CA1293107C (en) | 1991-12-17 |
Family
ID=4136461
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000547047A Expired - Lifetime CA1293107C (en) | 1986-09-17 | 1987-09-16 | Apparatus or treating a web of material |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1293107C (en) |
-
1987
- 1987-09-16 CA CA000547047A patent/CA1293107C/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |