CA2024342A1 - Sealing member for a filter press - Google Patents
Sealing member for a filter pressInfo
- Publication number
- CA2024342A1 CA2024342A1 CA 2024342 CA2024342A CA2024342A1 CA 2024342 A1 CA2024342 A1 CA 2024342A1 CA 2024342 CA2024342 CA 2024342 CA 2024342 A CA2024342 A CA 2024342A CA 2024342 A1 CA2024342 A1 CA 2024342A1
- Authority
- CA
- Canada
- Prior art keywords
- sealing member
- sealing
- pulp
- wire
- members
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 238000007789 sealing Methods 0.000 title claims abstract description 99
- 239000000463 material Substances 0.000 claims abstract description 10
- 239000002184 metal Substances 0.000 claims abstract description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 238000005452 bending Methods 0.000 abstract description 5
- 230000001154 acute effect Effects 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000008719 thickening Effects 0.000 description 2
- 238000012356 Product development Methods 0.000 description 1
- 229910000639 Spring steel Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920002457 flexible plastic Polymers 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920000136 polysorbate Polymers 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
- D21F1/80—Pulp catching, de-watering, or recovering; Re-use of pulp-water using endless screening belts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B9/00—Presses specially adapted for particular purposes
- B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
- B30B9/24—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using an endless pressing band
- B30B9/248—Means for sealing the press zone
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
- Filtration Of Liquid (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The present invention relates to a sealing member preferably for sealing of the sides of the pressing zone of filter presses used in the pulp and paper industry.
Previously known sealing members have been complicated. Most commonly they have been composed of sheet-formed rubber and supporting metal rods attached to each other with bolts. The users have not, however, been satisfied with such arrangements because the bolt attachment has not facilitated the structure of the sealing member remaining unchanged along the whole length of the press, but the sealing member has had to be left unsupported at the narrow end of the pressing zone, whereby it has often failed and let pulp be discharged to the press side. Furthermore, earlier seals have worn down very quickly. The sealing member according to the present invention solves the problems mentioned above because the sealing members (36, 38), made of practically permanent material which is ideal as to its friction properties relative to the wire surfaces, are constructed to form a single sealing member (30) together with the support members (32, 34), which sealing member (30) allows bending thereof conforming to the movements of the press wires, but prevents the tendency of the sealing member to bend, which tendency is caused by the pressure of pulp.
The present invention relates to a sealing member preferably for sealing of the sides of the pressing zone of filter presses used in the pulp and paper industry.
Previously known sealing members have been complicated. Most commonly they have been composed of sheet-formed rubber and supporting metal rods attached to each other with bolts. The users have not, however, been satisfied with such arrangements because the bolt attachment has not facilitated the structure of the sealing member remaining unchanged along the whole length of the press, but the sealing member has had to be left unsupported at the narrow end of the pressing zone, whereby it has often failed and let pulp be discharged to the press side. Furthermore, earlier seals have worn down very quickly. The sealing member according to the present invention solves the problems mentioned above because the sealing members (36, 38), made of practically permanent material which is ideal as to its friction properties relative to the wire surfaces, are constructed to form a single sealing member (30) together with the support members (32, 34), which sealing member (30) allows bending thereof conforming to the movements of the press wires, but prevents the tendency of the sealing member to bend, which tendency is caused by the pressure of pulp.
Description
2~243~2 .
SEALING MEMBER FOR A FILTER PRESS
The present invention relates to a sealing member for filter presses or the like in which the material to be treated is led in between two wires, whereby the sealing 5 member prevents the material from being discharged sideways from between the wires. The sealing member according to the invention is especially suitable for filter presses used for thlckening of pulp or sludge.
The sealing member of the present invention will be 10 described below in connection with a filter press which comprises a top wire unit and a bottom wire unit, and the pulp to be thickened is fed in between these units. The wires are supported by a plurality of successive rolls in ~uch a manner that the distance between the wires becomes 15 narrower in the longitudinal direction of the machine. The ` wire-supporting rolls are preferably so disposed that the pressing zone includes several press nips which contribute to the thickening of pulp i.e. by liquid being pressed out of the pulp through the wires. As a result of being pressed 20 ln ~uch a narrowing space, the pulp is naturally itself ~ pron- to dlscharge crosswlse relative to the direction of !~ - extenslon of the machine, in whlch case a side sealing ; .
arrangement is necessary for the pulp which 18 to be thlckened unlformly and, what i8 most lmportant, which is 25 not to be discharged from the sides of the press out of the pre~slng zone.
Finnish patent application 840841 discloses a typical prlor art sealing member for a wedge section of dewatering machlnes i.e. for a pressing zone. The sealing member is in 30 the flrst pl~ce dlsposed between said wires in the edge zone o~ the press wires. The sealing member itself comprises one or two sQaling ledges having the same thickness from one side to the other, which sealing ledge/ledges is/are bent bRtw en the wir-9 or attached in a U-Rhap- b~tween the wires 2~2~342 ~:
SEALING MEMBER FOR A FILTER PRESS
The present invention relates to a sealing member for filter presses or the like in which the material to be treated is led in between two wires, whereby the sealing 5 member prevents the material from being discharged sideways from between the wires. The sealing member according to the invention is especially suitable for filter presses used for thlckening of pulp or sludge.
The sealing member of the present invention will be 10 described below in connection with a filter press which comprises a top wire unit and a bottom wire unit, and the pulp to be thickened is fed in between these units. The wires are supported by a plurality of successive rolls in ~uch a manner that the distance between the wires becomes 15 narrower in the longitudinal direction of the machine. The ` wire-supporting rolls are preferably so disposed that the pressing zone includes several press nips which contribute to the thickening of pulp i.e. by liquid being pressed out of the pulp through the wires. As a result of being pressed 20 ln ~uch a narrowing space, the pulp is naturally itself ~ pron- to dlscharge crosswlse relative to the direction of !~ - extenslon of the machine, in whlch case a side sealing ; .
arrangement is necessary for the pulp which 18 to be thlckened unlformly and, what i8 most lmportant, which is 25 not to be discharged from the sides of the press out of the pre~slng zone.
Finnish patent application 840841 discloses a typical prlor art sealing member for a wedge section of dewatering machlnes i.e. for a pressing zone. The sealing member is in 30 the flrst pl~ce dlsposed between said wires in the edge zone o~ the press wires. The sealing member itself comprises one or two sQaling ledges having the same thickness from one side to the other, which sealing ledge/ledges is/are bent bRtw en the wir-9 or attached in a U-Rhap- b~tween the wires 2~2~342 ~:
by means of specific members. Both types of members arecharacterized in that the ledges used are entirely of the same thickness from one side to the other and that their outermost parts are fixed between metal or equivalent 5 frames, said frames being perpendicular to the plane of the wire and attached to one another with bolts. These arranqements have been possible, however, only at the wider end of the filter section where the distance between the wires i8 several centimetres. However, for a large part of 10 the pressing zone, the distance between the wires is less than 20 mm, and in the area close to the end even less than 10 mm. In the areas, the sealing member has no space between the wires for metal frames or a bolt to connect the frames, and the sealing ledge has to be left free and curved having 15 the same thickness from one side to the other, the pressure on which ledge easily bends it outwards so as to widen the efficient area between the wires towards the rear end of the press, whereby the pressing/thickening effect of the edge ~ections will no longer be the same as in the centerline of 20 the press. In the worst case, the sealing member will break and the pulp will be freely discharged to the sides of the machine.
~ , .
one of the drawbacks of prior art sealing members is, for example, their short lifetime of approximately two weeks, 25 because no material that would endure friction and other strains has been found. On the other hand, no company with strong enough product development potential has been interested in developing material suitable for this very .
purpose because the market, with respect to product 30 development costs, is very limited. Such sealing members are complicated in structure since they have a great number of ~eparate parts. Their lateral stiffness is poor, in other word~ they have to be very well 6u.pported which means that support members must be disposed very close together.
35 Furthermore, since the above-mentioned sealing members are plates with the same thickness from one side to the other, ~-~` 2~243~2 their sealing characteristic is not as good as it should be because the tip of the sealing lip is as stiff as the rest of the sealing ledge and therefore the tip does not readily respond to the movements of the wire surface. On the other 5 hand, a sealing ledge having the same thickness from one side to the other and which bends for as wide part as possible under the pulp pressure against the wire surfaces, results in a greater wearing of the sealing ledge.
The drawbacks of the prior art side sealing arrangements 10 described above were eliminated by a sealing arrangement according to Finnish patent 76703 which is characterized in that it comprises a back portion communicating with two lips leaving a space between the lips with the width of said space changing in the longitudinal direction of the sealing 15 member, and a support member disposed into communication with the back portion of the sealing members and to the opposite side of the back side respective to the space between the lips and substantially at the level in the "depth-direction" of the space.
~; 20 That sealing member was much more durable, cheaper to manufacture and easier to replace than the earlier arrangements.
.
However, the flexible plastic and rubber materials used ?~`,,`, in the arrangement according to the above-mentioned patent 25 have proved to be a bottleneck because, in the long run, they become brittle, their tip area begins to crackland they gradually lose their sealing ability. It has to be noted, however, that their lifetime is in any event manifold in comparison with prior art seals, but as it is not as long as 30 de~ired, a totally new arrangement has been developed for ~'~ sidQ ~ealing of filter presses. lt has been established that steel sQals, which were previously completely condemned, ~ bring about the best result when designed properly, and 1~ dimensioned and installed in a correct manner. Formerly ~ .:
~ ~ : ': s ' ' 2~2~342 : :
. . .: .
steel was not used because of the fear that it soon wears out the wire at contact surfaces. According to the former concept, the contact between the wire and the steel sealing had to be linear in order to maintain the web width 5 constant.
According to the present invention, it is possible, if desired, to maintain the web width constant and at the same time the contact surface between the wire and the sealing is large in area. Furthermore, the contact angle between the 10 sealing and the wire is acute, thereby resulting in a wiping, gentle contact between them.
The sealing arrangement according to the present invention is characterized in that the depth of the space between the two sealing elements, which communicate with the ~ ;
15 sealing member and are disposed between two moving plane surfaces, is reduced at the level of the pulp web in the direction of movement of the pulp web.
`~ The sealing member according to the present invention is described in more detail in the following by way of example, 20 with reference to the accompanying drawings, in which Fig. 1 is a schematic overall elevational view of a filter press including a sealing member according to the lnvention;
- ,. .
Fig. 2 a is an end view of a sealing member accarding to a preferred embodiment of the invention taken along line A - A of Fig. 3;
:,:
Fig. 2 b is an end view of a sealing member according to a second preferred embodiment of the invention;
and 30 Fig. 3 is a top view of an embodiment according to Fig. 2.
2~2~342 In accordance with Fig. 1, a filter press including a sealing member of the invention comprises a frame 10 provided with two wire sections, i.e. a bottom wire 12 and a top wire 14. The bottom wire 12 is supported in the pressing 5 zone 16 by rolls 18, which rolls are disposed relatively close to each other successively in the longitudinal direction of the press. The tension regulation of the bottom wire 12 is effected by adjusting the position of a wire turning roll 20 in a substantially horizontal direction. The 10 top wire 14 i~ supported in the pressing zone 16 by a group of rolls 22 which group is substantially vertically ad~ustable an~ its pulp inlet end (on the right-hand side of the figure) is pivoted to the frame 10, and the group is arranged to be vertically adjustably displaceable by means 15 of ad~usting means 24 at its opposite end. The tension regulation of the wire 14 is effected by a wire turning roll 26. The distancQ between the top and bottom wires is substantially constant at the pulp inlet end but adjustable at the opposite end. The pressing zone i8 preferably ~20 arranged so as to become narrower like a wedge to correspond à`;to the real dimensions of the pressing zone. Both sides of this pressing zone are provided with a sealing member according to the invention.
Fig. 2 i9 an end view of a sealing member 30, which 6~2S comprises support members 32, 34 and sealing elements 36, 38 ~`~pressed between said support members by means of screws or bolt~ 40. It is a characteristic of the invention jthat,the direction of the support members 32, 34 is substantially the same as that of the wires 12 and 14, i.e. the direction of ~`30 tho pulp web plane. The support members 32 and 34 are preferably metal ledges. The sealing elements 36 and 38 are preferably comprised of steel plate, especially of spring isteel, which, aocording to Fig. 2a is bent so as to form an angle ~ between the sealing elements 36 and 38 clamped .35 together. Thus, each sealing element is preferably 202~3~2 - 7 - ;
subjected to the extent of bending of B/2. It is also appreciated in Fig. 2a that the angle between the sealing elements 36 and 38 remains unchanged along the whole length of the sealing, unlike in the Finnish patent 76703 referred 5 to as the prior art and the basis of the present invention, ln which patent said angle changes evenly along the whole length of the sealing. A characteristic feature of the lnvention which brings about an acute contact angle between the sealing and the wire, i.e. a gently wiping contact, is 10 shown in both Fig. 2a and 3. Said figures 2a and 3 also indicate how the width of the sealing elements 36 and 38 ;
counted from the turning point, i.e. from the inner edge of the support members 32 and 34 to the tip of the sealing ~ -member, decreases in the direction of movement of the wires 15 ~arrow B in Fig. 3), whereby the distance between the tips of the ~ealing elements 36 and 38 is correspondingly reduced ~as well as the distance between the wires.
.. ~ ' ' ': .
Fig. 3 also show~ how the edge of the sealing element 36, which edge contact~ the top wire moving in the direction of ;
-~ 20 arrow ~, approaches the ~upport member 32. In other words, the contact surface between said edge and the wire i~ not ;; linear but a plane iurface, the width of the plane `~ ~ ¢onforming to the change of width of the sealing element 36 in the pro~ection in the direction of the wire plane. For ~ ~25 the same reason, the contact angle between the sealing P~ element and the wire is acute and the way of contact is c~ wiping.
!
t! ' Fig. 2b illustrates a second preferred embodiment of the invention, in which embodiment the tip parts of the sealing ~0 elements are bent to conform to the planes of the wires, ~; whereby the contact with the wire becomes more gentle and i~ also the area of the contact surface larger than in the embodiment of Fig. 2a.
~ . .
-: ' - ':
.1 ' .~.' ` 2024342 The object of the support members 32 and 34 in itself is to provide the sealing member with necessary lateral stiffness which is very important in order that the width of the pulp web to be thickened remains constant along the 5 whole length of the pressing zone and in order that the sealing member need not be supported by support means to be installed very close together, the number of which support means being directly proportional to the amount of work needed for the change of the sealing member. On the other 10 hand, the support means shown in the figures allows vertical bending of the sealing member, which may in some cases occur as the direction of the wires changes slightly. Such bendings have not been allowed by prior art sealing members because clamping means for sealing ledges, said clamping 15 mean,a being made of metal or equivalent material, have been positioned so as to resist bending in said direction.
A preferable material for the sealing element in a sealing member according to the invention is steel with such friction properties as to match well the plastic wire.
20 Spring steel has been found to be most suitable for this ~` purpose. Nowever, some other material with suitable tiffne~s and friction propertie,3 may be used as well. The support member is preferably a flat metal bar which may be readily arranged with clamping and support means for the as ,sealing member. In test apparatuses, specific quick-di,sconnect elements have been used as clamping and support ~, means for fast replacing of the sealing member.
As can be noted from the above description, a compl-tely new type of sealing member ha,s been developed for such 30 points of operation where a ,3tatlonary sealing of varying dlmensions i,s needed which may be disposed between two movable surface,3, The sealing member according to the invention eliminates or minimizes the weaknesses of the prior art solutions by simplifying the member to the utmost 35 thereby enabling fast manufacture and replacement thereof.
~'"'`:':~ ~.'
~ , .
one of the drawbacks of prior art sealing members is, for example, their short lifetime of approximately two weeks, 25 because no material that would endure friction and other strains has been found. On the other hand, no company with strong enough product development potential has been interested in developing material suitable for this very .
purpose because the market, with respect to product 30 development costs, is very limited. Such sealing members are complicated in structure since they have a great number of ~eparate parts. Their lateral stiffness is poor, in other word~ they have to be very well 6u.pported which means that support members must be disposed very close together.
35 Furthermore, since the above-mentioned sealing members are plates with the same thickness from one side to the other, ~-~` 2~243~2 their sealing characteristic is not as good as it should be because the tip of the sealing lip is as stiff as the rest of the sealing ledge and therefore the tip does not readily respond to the movements of the wire surface. On the other 5 hand, a sealing ledge having the same thickness from one side to the other and which bends for as wide part as possible under the pulp pressure against the wire surfaces, results in a greater wearing of the sealing ledge.
The drawbacks of the prior art side sealing arrangements 10 described above were eliminated by a sealing arrangement according to Finnish patent 76703 which is characterized in that it comprises a back portion communicating with two lips leaving a space between the lips with the width of said space changing in the longitudinal direction of the sealing 15 member, and a support member disposed into communication with the back portion of the sealing members and to the opposite side of the back side respective to the space between the lips and substantially at the level in the "depth-direction" of the space.
~; 20 That sealing member was much more durable, cheaper to manufacture and easier to replace than the earlier arrangements.
.
However, the flexible plastic and rubber materials used ?~`,,`, in the arrangement according to the above-mentioned patent 25 have proved to be a bottleneck because, in the long run, they become brittle, their tip area begins to crackland they gradually lose their sealing ability. It has to be noted, however, that their lifetime is in any event manifold in comparison with prior art seals, but as it is not as long as 30 de~ired, a totally new arrangement has been developed for ~'~ sidQ ~ealing of filter presses. lt has been established that steel sQals, which were previously completely condemned, ~ bring about the best result when designed properly, and 1~ dimensioned and installed in a correct manner. Formerly ~ .:
~ ~ : ': s ' ' 2~2~342 : :
. . .: .
steel was not used because of the fear that it soon wears out the wire at contact surfaces. According to the former concept, the contact between the wire and the steel sealing had to be linear in order to maintain the web width 5 constant.
According to the present invention, it is possible, if desired, to maintain the web width constant and at the same time the contact surface between the wire and the sealing is large in area. Furthermore, the contact angle between the 10 sealing and the wire is acute, thereby resulting in a wiping, gentle contact between them.
The sealing arrangement according to the present invention is characterized in that the depth of the space between the two sealing elements, which communicate with the ~ ;
15 sealing member and are disposed between two moving plane surfaces, is reduced at the level of the pulp web in the direction of movement of the pulp web.
`~ The sealing member according to the present invention is described in more detail in the following by way of example, 20 with reference to the accompanying drawings, in which Fig. 1 is a schematic overall elevational view of a filter press including a sealing member according to the lnvention;
- ,. .
Fig. 2 a is an end view of a sealing member accarding to a preferred embodiment of the invention taken along line A - A of Fig. 3;
:,:
Fig. 2 b is an end view of a sealing member according to a second preferred embodiment of the invention;
and 30 Fig. 3 is a top view of an embodiment according to Fig. 2.
2~2~342 In accordance with Fig. 1, a filter press including a sealing member of the invention comprises a frame 10 provided with two wire sections, i.e. a bottom wire 12 and a top wire 14. The bottom wire 12 is supported in the pressing 5 zone 16 by rolls 18, which rolls are disposed relatively close to each other successively in the longitudinal direction of the press. The tension regulation of the bottom wire 12 is effected by adjusting the position of a wire turning roll 20 in a substantially horizontal direction. The 10 top wire 14 i~ supported in the pressing zone 16 by a group of rolls 22 which group is substantially vertically ad~ustable an~ its pulp inlet end (on the right-hand side of the figure) is pivoted to the frame 10, and the group is arranged to be vertically adjustably displaceable by means 15 of ad~usting means 24 at its opposite end. The tension regulation of the wire 14 is effected by a wire turning roll 26. The distancQ between the top and bottom wires is substantially constant at the pulp inlet end but adjustable at the opposite end. The pressing zone i8 preferably ~20 arranged so as to become narrower like a wedge to correspond à`;to the real dimensions of the pressing zone. Both sides of this pressing zone are provided with a sealing member according to the invention.
Fig. 2 i9 an end view of a sealing member 30, which 6~2S comprises support members 32, 34 and sealing elements 36, 38 ~`~pressed between said support members by means of screws or bolt~ 40. It is a characteristic of the invention jthat,the direction of the support members 32, 34 is substantially the same as that of the wires 12 and 14, i.e. the direction of ~`30 tho pulp web plane. The support members 32 and 34 are preferably metal ledges. The sealing elements 36 and 38 are preferably comprised of steel plate, especially of spring isteel, which, aocording to Fig. 2a is bent so as to form an angle ~ between the sealing elements 36 and 38 clamped .35 together. Thus, each sealing element is preferably 202~3~2 - 7 - ;
subjected to the extent of bending of B/2. It is also appreciated in Fig. 2a that the angle between the sealing elements 36 and 38 remains unchanged along the whole length of the sealing, unlike in the Finnish patent 76703 referred 5 to as the prior art and the basis of the present invention, ln which patent said angle changes evenly along the whole length of the sealing. A characteristic feature of the lnvention which brings about an acute contact angle between the sealing and the wire, i.e. a gently wiping contact, is 10 shown in both Fig. 2a and 3. Said figures 2a and 3 also indicate how the width of the sealing elements 36 and 38 ;
counted from the turning point, i.e. from the inner edge of the support members 32 and 34 to the tip of the sealing ~ -member, decreases in the direction of movement of the wires 15 ~arrow B in Fig. 3), whereby the distance between the tips of the ~ealing elements 36 and 38 is correspondingly reduced ~as well as the distance between the wires.
.. ~ ' ' ': .
Fig. 3 also show~ how the edge of the sealing element 36, which edge contact~ the top wire moving in the direction of ;
-~ 20 arrow ~, approaches the ~upport member 32. In other words, the contact surface between said edge and the wire i~ not ;; linear but a plane iurface, the width of the plane `~ ~ ¢onforming to the change of width of the sealing element 36 in the pro~ection in the direction of the wire plane. For ~ ~25 the same reason, the contact angle between the sealing P~ element and the wire is acute and the way of contact is c~ wiping.
!
t! ' Fig. 2b illustrates a second preferred embodiment of the invention, in which embodiment the tip parts of the sealing ~0 elements are bent to conform to the planes of the wires, ~; whereby the contact with the wire becomes more gentle and i~ also the area of the contact surface larger than in the embodiment of Fig. 2a.
~ . .
-: ' - ':
.1 ' .~.' ` 2024342 The object of the support members 32 and 34 in itself is to provide the sealing member with necessary lateral stiffness which is very important in order that the width of the pulp web to be thickened remains constant along the 5 whole length of the pressing zone and in order that the sealing member need not be supported by support means to be installed very close together, the number of which support means being directly proportional to the amount of work needed for the change of the sealing member. On the other 10 hand, the support means shown in the figures allows vertical bending of the sealing member, which may in some cases occur as the direction of the wires changes slightly. Such bendings have not been allowed by prior art sealing members because clamping means for sealing ledges, said clamping 15 mean,a being made of metal or equivalent material, have been positioned so as to resist bending in said direction.
A preferable material for the sealing element in a sealing member according to the invention is steel with such friction properties as to match well the plastic wire.
20 Spring steel has been found to be most suitable for this ~` purpose. Nowever, some other material with suitable tiffne~s and friction propertie,3 may be used as well. The support member is preferably a flat metal bar which may be readily arranged with clamping and support means for the as ,sealing member. In test apparatuses, specific quick-di,sconnect elements have been used as clamping and support ~, means for fast replacing of the sealing member.
As can be noted from the above description, a compl-tely new type of sealing member ha,s been developed for such 30 points of operation where a ,3tatlonary sealing of varying dlmensions i,s needed which may be disposed between two movable surface,3, The sealing member according to the invention eliminates or minimizes the weaknesses of the prior art solutions by simplifying the member to the utmost 35 thereby enabling fast manufacture and replacement thereof.
~'"'`:':~ ~.'
Claims (6)
1. A sealing member intended for use between two plane surfaces which surfaces move relative to said sealing member and the distance therebetween changes in the longitudinal direction of the sealing member, said sealing member being attached at its support structure to the frame of a machine in such a manner that the two sealing elements connected to said sealing member leave a space therebetween and are disposed between said plane surfaces, wherein the depth of said space between the two sealing members at the level of the pulp web is reduced in the direction of movement of the pulp web.
2. A sealing member claimed in claim 1, wherein the bottom angle B of the space between the two sealing members remains constant along the whole length of the sealing member.
3. A sealing member as claimed in claim 1, wherein the sealing elements define the space therebetween, the width of said sealing elements counted from the support structure to the tip of the sealing element becomes narrower in the direction of movement of the pulp web.
4. A sealing member as claimed in claim 1, wherein the support structure of the sealing member is formed on two ledges arranged in the direction of the pulp web level, between which ledges one edge of the sealing elements is pressed.
5. A sealing member as claimed in claim 1, wherein the part of edge of the sealing members which part lies against the wire is bent substantially to the level of the wire.
6. A sealing member as claimed in claim 1, wherein the material of the sealing member is metal, preferably steel.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI894079A FI83480C (en) | 1989-08-31 | 1989-08-31 | TAETNINGSORGAN VID FILTERPRESS. |
| FI894079 | 1989-08-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2024342A1 true CA2024342A1 (en) | 1991-03-01 |
Family
ID=8528916
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2024342 Abandoned CA2024342A1 (en) | 1989-08-31 | 1990-08-30 | Sealing member for a filter press |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0415686A3 (en) |
| JP (1) | JPH03219168A (en) |
| CA (1) | CA2024342A1 (en) |
| FI (1) | FI83480C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4404581A1 (en) * | 1994-02-12 | 1995-08-17 | Roehm Gmbh | sealing cord |
| AT410451B (en) * | 2001-12-19 | 2003-05-26 | Andritz Ag Maschf | Water extraction station, for a web of wet cellulose suspension from a stock inlet, has a wedge gap between the fourdriniers/blankets with side seals and extensions at the sealing bars into the end of the wedge |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH460715A (en) * | 1967-10-18 | 1968-08-15 | Gujer Hans | Method for pressing out liquid-containing pressed material and device for performing the method |
| DE3404422A1 (en) * | 1983-03-24 | 1984-10-04 | Anstalt für Strömungsmaschinen GmbH, Graz | Sealing device of the wedge section of draining machines |
| FI76703C (en) * | 1987-07-17 | 1988-12-12 | Ahlstroem Oy | Sealing device for filtration press |
-
1989
- 1989-08-31 FI FI894079A patent/FI83480C/en not_active IP Right Cessation
-
1990
- 1990-08-24 EP EP19900309356 patent/EP0415686A3/en not_active Withdrawn
- 1990-08-30 CA CA 2024342 patent/CA2024342A1/en not_active Abandoned
- 1990-08-31 JP JP2232275A patent/JPH03219168A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| FI83480C (en) | 1991-07-25 |
| EP0415686A2 (en) | 1991-03-06 |
| FI83480B (en) | 1991-04-15 |
| FI894079A0 (en) | 1989-08-31 |
| JPH03219168A (en) | 1991-09-26 |
| EP0415686A3 (en) | 1991-09-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |