CA1235010A - Water-removal element for the wet stage of a paper- making machine - Google Patents
Water-removal element for the wet stage of a paper- making machineInfo
- Publication number
- CA1235010A CA1235010A CA000448186A CA448186A CA1235010A CA 1235010 A CA1235010 A CA 1235010A CA 000448186 A CA000448186 A CA 000448186A CA 448186 A CA448186 A CA 448186A CA 1235010 A CA1235010 A CA 1235010A
- Authority
- CA
- Canada
- Prior art keywords
- segments
- felt
- water
- rail
- removal
- 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
Links
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
- D21F1/48—Suction apparatus
- D21F1/52—Suction boxes without rolls
- D21F1/523—Covers thereof
-
- 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
- D21F1/48—Suction apparatus
- D21F1/483—Drainage foils and bars
Abstract
ABSTRACT
A rail-shaped water-removal element for the wet stage of a water-removal machine, in particular a paper-making machine, such as a mesh table, foil, couch roll, wet suction roll, suction roll, suction tube and suction felt is so shaped that the layer that is in sliding contact with the mesh or felt consists of individual segments of hard material such as sistered aluminum oxide and silicon carbide. These segments having devices for the installation of profile rails that extend transversely to the direction of movement felt or mesh of the machine, the in-dividual segments having at the ends of their longitudinal sides stepped jointing surfaces that extend across the whole width of the segments and are cemented to each other at these jointing surfaces.
A rail-shaped water-removal element for the wet stage of a water-removal machine, in particular a paper-making machine, such as a mesh table, foil, couch roll, wet suction roll, suction roll, suction tube and suction felt is so shaped that the layer that is in sliding contact with the mesh or felt consists of individual segments of hard material such as sistered aluminum oxide and silicon carbide. These segments having devices for the installation of profile rails that extend transversely to the direction of movement felt or mesh of the machine, the in-dividual segments having at the ends of their longitudinal sides stepped jointing surfaces that extend across the whole width of the segments and are cemented to each other at these jointing surfaces.
Description
The present invention relates to a rail-like water-removal element for the sieve or felt part of a wa-ter-remo~al ma-chine, especially for paper-making machinery, such as a mesh table, foil, couch roll, wet suction roll, suction roll, tube suction roll, and suction felt, the layer of which that is in sliding contact with the mesh or felt consisting of individual segments of hard material, such as sistered aluminum oxide, and silicon carbide, these segments having a shoulder on the side remote from and opposite to the mesh, the individual segments being secured to a rail by means of said shoulder, said rail being adapted to be installed on the supporting structure of the water-removal machine.
Rail-like water-removal elements for the mesh or felt stage of a water-removal machine, built up from individual segments made of hard material in combination with other materials are known. The introduction of water-removal elements provided with hard materials has the advantage of permitting high operating speeds to be attained by present day water-removal machinery.
It is necessary to build up the water-removal elements from in-dividual segments because bodies produced from hard materials cannot be produced in one piece having large-area configurations, as can be done, for example, when using plastics. An important disadvantage in building up segments is that the butt joints be-tweet thy individual segments can damage the mesh and felt and can cause defects, such as water stripes in the paper being pro-duped, particularly if there are manufacturing tolerances between the individual segments. This disadvantage can be eliminated when the manufacturer grinds off a finished water-removal element.
Nevertheless, gaps can open up at the butt joints if the water-removal elements are subjected to bending, torsion, and/or thermal expansion.
In order to avoid these disadvantages No. DEEPS 23 63 732 I
discloses a water-removal device in which the wear-r~sis-tant sex-mints of hard material, which have a shoulder or a trapezoidal groove which extends in a longitudinal direction on their under-sides, are secured by means of a molded mass in a U-shaped metal rail. Taken together, the metal rail and the segments of hard material form a structural element for the water-removal element, said element extending across the whole width of the paper-making machine. In order to compensate for thickness tolerances of the different hard materials that are governed by manufacturing pro-cusses, the contact surfaces of the segments on the U-shaped metal rails must also be subjected to a costly grinding process.
Water-removal elements of such a bonded construction can rupture at the butt joints between the segments of hard material if they are bent or twisted about the longitudinal axis, because of the elastic-plastic joint with the U-rails, and these ruptures can lead to the aforesaid disadvantages. Also, stress loads can occur in the bonded body as a result of differing thermal expand soon in the metal rail and the segments of hard material.
DEEPS No. 21 10 564 discloses a water-removal device in which the hard material segments that are let into a support rail are pressed against each other by a clamping element. This clamping clement consists of a rod and two movable jaws at the ends of the rod. One disadvantage of such a structure is that if the water-removal element is bent, compression forces can occur at the butt joints between the individual hard material elements and these can cause the hard material to rupture. In the same way, if the water-rernoval element is twisted about the longitudinal axis ruptures can occur at the butt joints between the individual segments of hard material because of the slight twisting and these can lead to the aforesaid mesh and felt damage. In addition, in this structure the production of the individual hard material segments demands the observance of extremely close tolerances and the greatest possible an~lclr precision when ye blowout joint surfaces are machined, and this results in considerable costs for grinding operations.
DEMOS No. 23 36 450 discloses a built-up ceramic come potent as a water-removal element, this being under adequate pro-run '3 ssure-pL~ go loading so that when the element is bent as a result of bending forces or thermal changes, the resulting come I press ion loads are absorbed on the inner side of the curve. One disadvantage of this structure is that once again -there is a requirement for costly and very precise machining of the individual ceramic elements. Furthermore, it is impossible to achieve a con-slant and adequate pressure-pretensioning loading by the tension anchor because of the differing coefficients of thermal expansion of ceramic and steel. The temperature span in the paper-making machinery is between 20 and 85C. Thus, there is a danger -that despite pretensioning the butt joints will rupture under bending loads or that stress peaks that occur on the edges of the individual ceramic elements can lead to rupturing in the pressure areas of the butt joints. In addition, the structure contained in DEMOS No. 23 36 450 and DEEPS No. 21 10 564 require a hole in the ceramic sex-mint and this leads to a weakening of this segment.
Thus, the present invention provides a rail-shaped water-removal element for the mesh or felt part of a water-removal macho ire, said water-removal element displaying no breaks, chipping or gaps at the butt joints between the individual ceramic segments under bending loads, longitudinal torsion, or thermal expansion, which water-removal element can be adjusted to any length and fine-ground, is simple to install, and safe and easy to manipulate.
In accordance with the present invention, there is pro-voided a rail-shaped water-removal element for the mesh or felt stage of a water-removal machine, in particular a paper-making machine, such as a mesh table, foil, couch roll, wet suction roll, suction roll, suction tube and suction felt, the layer of which that is in slidln~ contact with the mesh or felt layer Wormed from individual segments of hard Motorola such as sistered aluminum oxide, and silicon carbide said individual segments having a shoulder on the side furthest from the mesh or felt and being sea-used to a rail that extends transversely to the direction of movement of the mesh or felt and by said rail being adapted to be installed on the supporting structure of the water-removal machinery, said individual segments being cemented to each other and having stepped jointing surfaces on their longitudinal side ends which extend across the whole width of the segments.
The advantage of the present invention lies in the fact that by joining the individual stepped jointing surfaces and sea using them by cementing a structure which can be considered as a self-supporting water-removal element from strength consider-lions results and which, as such, can be handled safely. Since the upper portion and the shoulder are of material that has the same coefficient of expansion, with a bonded construction of this kind no forces that could cause a change of shape or deformation, especially at the stepped jointing surfaces, and subsequent fail-use of the component, will result from thermal expansion in the event of temperature changes.
I've stepped jointing surfaces permit a positive and form-locking cemented joint, this resulting in a considerable increase in the area of the surfaces that are in contact as compared to a simple butt joint, and this in its turn results in a reduction in the specific surface loads that occur.
Since the critical shear strength of the cemented joint is greater than the critical static strength of the selected hard materials, i.e., ceramic substances, there will be no pies-tic or elastic deformations and concomitant changes in shape of the rail-shaped water-removal element. Generally conventional materials such as glues, solders, cements or low-melting point mixtures of inorganic glass-forming non-water soluble compounds can be used to produce the cemented joint, provided only that they possess the required degree of strength.
In a preferred embodiment of the invention the stepped jointing surfaces are perpendicular to the longitudinal axis of the segment and in each instance form a right-angle with each other.
In a particularly preferred embodiment of the present invention, the segment of hard materials is not formed in one piece and then ground, but is made up of a separately produced upper portion and a shoulder, these being of equal length, the upper portion being displaced one-half length in relation to the shoulder, and then bonded to the shoulder by means of cement.
The upper portion and the shoulder may be made of the same material having the same characteristics however, since no demands with regard to grain size distribution, surface hardness, pore volume, pore distribution, and grinding and polishing chafe-cteristics are imposed on the shoulder, starting materials that meet only the requirements for strength and coefficient of then-met expansion can be used, whereas the upper portion, which is in contact with the mesh or felt stages, should have as few pores as possible, in order that no particles of filler can accumulate in them, causing damage to the mesh or felt. Pores are, however, desirable in the shoulder since they improve adhesion of the gem-en. The shoulder can be produced, for example, from the waste material that results from processing the uncured blanks for the upper portion.
The jointing surfaces that are parallel to the longitu-dial axis of the segment are to be identical to the neutral axis of the overall cross-section, or they may be above the neutral axis. If the jointing surface lies on the neutral axis, there will be no compression, tensile or other stresses. If the jointing surface is above the neutral axis, the cement layer will only be subjected to compression forces. A high level of reliability is Sly thus guaranteed or the joint. Were the adhesion to be stressed on forming, the reliability of the joint would only be a fraction of that under shear stresses.
The present invention will be further illustrated by way of the accompanying drawings in which:-Figure 1 is a perspective view of a segment of hard material in accordance with one embodiment of the present invent lion;
Figure 2 is a side elevation of a water-removal element made up of segments of hard material of Figure 1, extending trays-verse to the direction of movement of the machine, Figure 3 is a side view of a second embodiment of a water removal element, extending transverse to the direction of movement of the machine;
Figure 4 is a cross-section on the plane of the line V-V of Figure 3;
Figure 5 is a perspective view of a third embodiment of a water-removal element; and ; Figure 6 is a cross-section of a water-removal element with a profile rail and a supporting structure of the water-removal machine.
Referring to the accompanying drawings, the one-piece segment 1 of hard material shown in perspective in Figure 1 has a shoulder 3 that is secured in a profile rail 9 shown in Figure 6. The shoulder 3 is offset longitudinally in relation to the upper portion 2 of the segment 1, and is of a suitable trapezoidal shape (Figure 1) or T-shape (Figure 4). A very secure union with the supporting structure 10 shown in Figure 6 is provided by means of the profile rail 9. The upper portion 2 of the segment 1 is in direct con-tact with the sieve mesh or felt, the direction of the sieve mesh or felt being indicated by the arrow 6. The cross-section ox the upper portion 2 is shown as being rectangular. It can, however, be of any shape. The stepped joint surfaces that are formed in each instance from the surface that extend parallel to the longitudinal axis of the secJment, and the surfaces 5 that are, in each instance, perpendicular to the longitudinal axis of the segment serve to ensure a shape- and force locking union with the cement between adjacent segments 1.
Figure 2 shows a water-removal element composed of in-dividual segments 1, transverse to the direction of movement of the sieve mesh or felt. The stepped joint surfaces, formed from the individual surfaces 4 and 5, are set very close together and are bonded together by the cement layer 8.
Figure 3 shows a further embodiment of a water-removal element, the two-part segment 1 consisting of an upper portion 2 and the shoulder 3, it being simple to produce and machine them.
The upper portion 2 and the shoulder 3 are of the same length and are, in each instance, displaced by a half-length on their joint surfaces that extend horizontally, parallel to the long-tudinal axis and cemented firmly in position by the cement layer 8. Once again, the stepped joint surfaces between the individual segments 1 are formed by the surfaces 4 and 5.
Figure 4 is a side view of a water removal element in the plane of -the line IV-IV in Figure 3. The upper portion 2 is shaped as a foil. The joint with the shoulder 3 is effected by means of the cement layer 8. The shoulder 3 has a T-shaped cross-section. The water-removal element is connected to the supporting structure by means of the profile rail 9 shown in Figure 6.
Figure 5 is a perspective view of a third embodiment of the water-removal element which, once again, is built up from two-part individual segment 1. The direction of movement of the sieve mesh is indicated by the arrow 6. The upper portion 2 is in the form of a foil, this being wider than the shoulder 3. The shoulder 3 has a swallow-tail cross-section to provide a connection with the profile rail (not shown). The strength of the shoulder 3 in its vertical extension is greater than the strength of the upper portion I The upper portion 2 is owe the same installed length as the shoulder 3 and is displaced on the shoulder 3 by one-half its length and secured by means of the cement layer 8.
Figure 6 is a vertical section through the water-removal element installed on the supporting structure of a water-removal machine. The contact surface 11 of the upper portion 2 touches the sieve mesh or the felt, the direction of movement of which is in-dilated by the arrow 6. The shoulder 3, which is secured by the upper portion 2, is of trapezoidal cross-section, and engages in the profile rail 9 that is made of plastic, glass-fibre reinforced plastic or metal. In its turn, the profile rail 9 surrounds a T-shaped metal rail 12 of the supporting structure 10 of the water-removal machine. Only the shoulder 3 of the water-removal element can move freely in the recess of the profile rail 9 transversely to the direction of movement of the sieve mesh. In the same manner, the profile rail 9 on the T-shaped metal rail 12 with the support tying structure 10 can move freely only transversely to the direct lion of movement 6 of -the sieve mesh. This arrangement means that thermal expansion within the assembled structure is equalized by sliding backlash with the result that no bending loads occur on the water-removal element.
Rail-like water-removal elements for the mesh or felt stage of a water-removal machine, built up from individual segments made of hard material in combination with other materials are known. The introduction of water-removal elements provided with hard materials has the advantage of permitting high operating speeds to be attained by present day water-removal machinery.
It is necessary to build up the water-removal elements from in-dividual segments because bodies produced from hard materials cannot be produced in one piece having large-area configurations, as can be done, for example, when using plastics. An important disadvantage in building up segments is that the butt joints be-tweet thy individual segments can damage the mesh and felt and can cause defects, such as water stripes in the paper being pro-duped, particularly if there are manufacturing tolerances between the individual segments. This disadvantage can be eliminated when the manufacturer grinds off a finished water-removal element.
Nevertheless, gaps can open up at the butt joints if the water-removal elements are subjected to bending, torsion, and/or thermal expansion.
In order to avoid these disadvantages No. DEEPS 23 63 732 I
discloses a water-removal device in which the wear-r~sis-tant sex-mints of hard material, which have a shoulder or a trapezoidal groove which extends in a longitudinal direction on their under-sides, are secured by means of a molded mass in a U-shaped metal rail. Taken together, the metal rail and the segments of hard material form a structural element for the water-removal element, said element extending across the whole width of the paper-making machine. In order to compensate for thickness tolerances of the different hard materials that are governed by manufacturing pro-cusses, the contact surfaces of the segments on the U-shaped metal rails must also be subjected to a costly grinding process.
Water-removal elements of such a bonded construction can rupture at the butt joints between the segments of hard material if they are bent or twisted about the longitudinal axis, because of the elastic-plastic joint with the U-rails, and these ruptures can lead to the aforesaid disadvantages. Also, stress loads can occur in the bonded body as a result of differing thermal expand soon in the metal rail and the segments of hard material.
DEEPS No. 21 10 564 discloses a water-removal device in which the hard material segments that are let into a support rail are pressed against each other by a clamping element. This clamping clement consists of a rod and two movable jaws at the ends of the rod. One disadvantage of such a structure is that if the water-removal element is bent, compression forces can occur at the butt joints between the individual hard material elements and these can cause the hard material to rupture. In the same way, if the water-rernoval element is twisted about the longitudinal axis ruptures can occur at the butt joints between the individual segments of hard material because of the slight twisting and these can lead to the aforesaid mesh and felt damage. In addition, in this structure the production of the individual hard material segments demands the observance of extremely close tolerances and the greatest possible an~lclr precision when ye blowout joint surfaces are machined, and this results in considerable costs for grinding operations.
DEMOS No. 23 36 450 discloses a built-up ceramic come potent as a water-removal element, this being under adequate pro-run '3 ssure-pL~ go loading so that when the element is bent as a result of bending forces or thermal changes, the resulting come I press ion loads are absorbed on the inner side of the curve. One disadvantage of this structure is that once again -there is a requirement for costly and very precise machining of the individual ceramic elements. Furthermore, it is impossible to achieve a con-slant and adequate pressure-pretensioning loading by the tension anchor because of the differing coefficients of thermal expansion of ceramic and steel. The temperature span in the paper-making machinery is between 20 and 85C. Thus, there is a danger -that despite pretensioning the butt joints will rupture under bending loads or that stress peaks that occur on the edges of the individual ceramic elements can lead to rupturing in the pressure areas of the butt joints. In addition, the structure contained in DEMOS No. 23 36 450 and DEEPS No. 21 10 564 require a hole in the ceramic sex-mint and this leads to a weakening of this segment.
Thus, the present invention provides a rail-shaped water-removal element for the mesh or felt part of a water-removal macho ire, said water-removal element displaying no breaks, chipping or gaps at the butt joints between the individual ceramic segments under bending loads, longitudinal torsion, or thermal expansion, which water-removal element can be adjusted to any length and fine-ground, is simple to install, and safe and easy to manipulate.
In accordance with the present invention, there is pro-voided a rail-shaped water-removal element for the mesh or felt stage of a water-removal machine, in particular a paper-making machine, such as a mesh table, foil, couch roll, wet suction roll, suction roll, suction tube and suction felt, the layer of which that is in slidln~ contact with the mesh or felt layer Wormed from individual segments of hard Motorola such as sistered aluminum oxide, and silicon carbide said individual segments having a shoulder on the side furthest from the mesh or felt and being sea-used to a rail that extends transversely to the direction of movement of the mesh or felt and by said rail being adapted to be installed on the supporting structure of the water-removal machinery, said individual segments being cemented to each other and having stepped jointing surfaces on their longitudinal side ends which extend across the whole width of the segments.
The advantage of the present invention lies in the fact that by joining the individual stepped jointing surfaces and sea using them by cementing a structure which can be considered as a self-supporting water-removal element from strength consider-lions results and which, as such, can be handled safely. Since the upper portion and the shoulder are of material that has the same coefficient of expansion, with a bonded construction of this kind no forces that could cause a change of shape or deformation, especially at the stepped jointing surfaces, and subsequent fail-use of the component, will result from thermal expansion in the event of temperature changes.
I've stepped jointing surfaces permit a positive and form-locking cemented joint, this resulting in a considerable increase in the area of the surfaces that are in contact as compared to a simple butt joint, and this in its turn results in a reduction in the specific surface loads that occur.
Since the critical shear strength of the cemented joint is greater than the critical static strength of the selected hard materials, i.e., ceramic substances, there will be no pies-tic or elastic deformations and concomitant changes in shape of the rail-shaped water-removal element. Generally conventional materials such as glues, solders, cements or low-melting point mixtures of inorganic glass-forming non-water soluble compounds can be used to produce the cemented joint, provided only that they possess the required degree of strength.
In a preferred embodiment of the invention the stepped jointing surfaces are perpendicular to the longitudinal axis of the segment and in each instance form a right-angle with each other.
In a particularly preferred embodiment of the present invention, the segment of hard materials is not formed in one piece and then ground, but is made up of a separately produced upper portion and a shoulder, these being of equal length, the upper portion being displaced one-half length in relation to the shoulder, and then bonded to the shoulder by means of cement.
The upper portion and the shoulder may be made of the same material having the same characteristics however, since no demands with regard to grain size distribution, surface hardness, pore volume, pore distribution, and grinding and polishing chafe-cteristics are imposed on the shoulder, starting materials that meet only the requirements for strength and coefficient of then-met expansion can be used, whereas the upper portion, which is in contact with the mesh or felt stages, should have as few pores as possible, in order that no particles of filler can accumulate in them, causing damage to the mesh or felt. Pores are, however, desirable in the shoulder since they improve adhesion of the gem-en. The shoulder can be produced, for example, from the waste material that results from processing the uncured blanks for the upper portion.
The jointing surfaces that are parallel to the longitu-dial axis of the segment are to be identical to the neutral axis of the overall cross-section, or they may be above the neutral axis. If the jointing surface lies on the neutral axis, there will be no compression, tensile or other stresses. If the jointing surface is above the neutral axis, the cement layer will only be subjected to compression forces. A high level of reliability is Sly thus guaranteed or the joint. Were the adhesion to be stressed on forming, the reliability of the joint would only be a fraction of that under shear stresses.
The present invention will be further illustrated by way of the accompanying drawings in which:-Figure 1 is a perspective view of a segment of hard material in accordance with one embodiment of the present invent lion;
Figure 2 is a side elevation of a water-removal element made up of segments of hard material of Figure 1, extending trays-verse to the direction of movement of the machine, Figure 3 is a side view of a second embodiment of a water removal element, extending transverse to the direction of movement of the machine;
Figure 4 is a cross-section on the plane of the line V-V of Figure 3;
Figure 5 is a perspective view of a third embodiment of a water-removal element; and ; Figure 6 is a cross-section of a water-removal element with a profile rail and a supporting structure of the water-removal machine.
Referring to the accompanying drawings, the one-piece segment 1 of hard material shown in perspective in Figure 1 has a shoulder 3 that is secured in a profile rail 9 shown in Figure 6. The shoulder 3 is offset longitudinally in relation to the upper portion 2 of the segment 1, and is of a suitable trapezoidal shape (Figure 1) or T-shape (Figure 4). A very secure union with the supporting structure 10 shown in Figure 6 is provided by means of the profile rail 9. The upper portion 2 of the segment 1 is in direct con-tact with the sieve mesh or felt, the direction of the sieve mesh or felt being indicated by the arrow 6. The cross-section ox the upper portion 2 is shown as being rectangular. It can, however, be of any shape. The stepped joint surfaces that are formed in each instance from the surface that extend parallel to the longitudinal axis of the secJment, and the surfaces 5 that are, in each instance, perpendicular to the longitudinal axis of the segment serve to ensure a shape- and force locking union with the cement between adjacent segments 1.
Figure 2 shows a water-removal element composed of in-dividual segments 1, transverse to the direction of movement of the sieve mesh or felt. The stepped joint surfaces, formed from the individual surfaces 4 and 5, are set very close together and are bonded together by the cement layer 8.
Figure 3 shows a further embodiment of a water-removal element, the two-part segment 1 consisting of an upper portion 2 and the shoulder 3, it being simple to produce and machine them.
The upper portion 2 and the shoulder 3 are of the same length and are, in each instance, displaced by a half-length on their joint surfaces that extend horizontally, parallel to the long-tudinal axis and cemented firmly in position by the cement layer 8. Once again, the stepped joint surfaces between the individual segments 1 are formed by the surfaces 4 and 5.
Figure 4 is a side view of a water removal element in the plane of -the line IV-IV in Figure 3. The upper portion 2 is shaped as a foil. The joint with the shoulder 3 is effected by means of the cement layer 8. The shoulder 3 has a T-shaped cross-section. The water-removal element is connected to the supporting structure by means of the profile rail 9 shown in Figure 6.
Figure 5 is a perspective view of a third embodiment of the water-removal element which, once again, is built up from two-part individual segment 1. The direction of movement of the sieve mesh is indicated by the arrow 6. The upper portion 2 is in the form of a foil, this being wider than the shoulder 3. The shoulder 3 has a swallow-tail cross-section to provide a connection with the profile rail (not shown). The strength of the shoulder 3 in its vertical extension is greater than the strength of the upper portion I The upper portion 2 is owe the same installed length as the shoulder 3 and is displaced on the shoulder 3 by one-half its length and secured by means of the cement layer 8.
Figure 6 is a vertical section through the water-removal element installed on the supporting structure of a water-removal machine. The contact surface 11 of the upper portion 2 touches the sieve mesh or the felt, the direction of movement of which is in-dilated by the arrow 6. The shoulder 3, which is secured by the upper portion 2, is of trapezoidal cross-section, and engages in the profile rail 9 that is made of plastic, glass-fibre reinforced plastic or metal. In its turn, the profile rail 9 surrounds a T-shaped metal rail 12 of the supporting structure 10 of the water-removal machine. Only the shoulder 3 of the water-removal element can move freely in the recess of the profile rail 9 transversely to the direction of movement of the sieve mesh. In the same manner, the profile rail 9 on the T-shaped metal rail 12 with the support tying structure 10 can move freely only transversely to the direct lion of movement 6 of -the sieve mesh. This arrangement means that thermal expansion within the assembled structure is equalized by sliding backlash with the result that no bending loads occur on the water-removal element.
Claims (4)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A rail-shaped water-removal element for the movable sieve or felt stage of a fiber material water-removal machine with said element being in sliding contact with the sieve or felt stage, said element comprising individual segments of a hard ceramic material elongated In the direction extending trans-versely of the direction of movement of the sieve or felt stage, said segments having butt ends extending transversely of the elongated direction thereof and said segments being cemented together at the butt ends thereof, said segments having a projec-tion on the side thereof facing away from the sieve or felt stage, said projection arranged to be attached to a profiled rail extending transversely of the direction of movement of the sieve or felt stage and the profiled rail being attachable to a part of the supporting structure of the water-removal machine, wherein the Improvement comprises that each said segment comprises an upper sintered monolithic portion arranged for sliding contact with the sieve or felt stage and a separate lower sintered mono-lithic portion with said lower portion forming said projection, said upper and lower portions having identical thermal coeffi-cients of expansion, said upper and lower portions being cemented together and the butt ends of said upper portions being offset relative to the butt ends of said lower portions in the elongated direction of said segments.
2. A rail-shaped water-removal element, as set forth in claim 1, wherein said upper portion and said lower portion are formed of the identical material.
3. A rail-shaped water-removal element as set forth in claim 1, wherein the transverse cross-section of said individual segments is selected so that the joint between the upper portion and the lower portion forming said projection is located on the neutral axis of the overall cross-section.
4. A rail-shaped water removal element, as set forth in claim 2, wherein the transverse cross-section of said individual segments is selected so that the joint between the upper portion and the lower portion forming said projection is located on the neutral axis of the overall cross-section.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP3306457.1 | 1983-02-24 | ||
| DE3306457A DE3306457C2 (en) | 1983-02-24 | 1983-02-24 | Drainage element for the wet part of a paper machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1235010A true CA1235010A (en) | 1988-04-12 |
Family
ID=6191719
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000448186A Expired CA1235010A (en) | 1983-02-24 | 1984-02-23 | Water-removal element for the wet stage of a paper- making machine |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP0135544B1 (en) |
| JP (1) | JPS60500819A (en) |
| BR (1) | BR8405488A (en) |
| CA (1) | CA1235010A (en) |
| DE (2) | DE3306457C2 (en) |
| FI (1) | FI80093C (en) |
| IT (1) | IT1180437B (en) |
| SU (1) | SU1431685A3 (en) |
| WO (1) | WO1984003314A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8097122B2 (en) | 2007-05-23 | 2012-01-17 | Astenjohnson, Inc. | Papermaking machine dewatering blade incorporating attachment mechanism |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3823882A1 (en) * | 1988-07-14 | 1990-01-18 | Feldmuehle Ag | SLOT SUCTION |
| DE29504419U1 (en) * | 1995-03-15 | 1995-05-11 | Voith Sulzer Papiermasch Gmbh | Last unit for the flexible support of a paper machine belt |
| GB9518713D0 (en) * | 1995-09-13 | 1995-11-15 | Int Syalons Newcastle Ltd | Wear-resistant blade element |
| DE10130323A1 (en) * | 2001-06-22 | 2003-01-02 | Voith Paper Patent Gmbh | Wear body in laminated construction, in particular in a paper or board machine, process for its production and its use |
| ES2329843T3 (en) | 2006-10-16 | 2009-12-01 | Klaus Bartelmuss | SCREEN LIST FOR PAPER GENERATION FACILITIES. |
| US7918969B2 (en) * | 2007-03-23 | 2011-04-05 | Astenjohnson, Inc. | Composite construction for dewatering blades for a papermaking machine |
| AT524317B1 (en) * | 2021-06-08 | 2022-05-15 | Bartelmuss Ing Klaus | Drip bar and kit for use in a paper web forming installation |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE349341B (en) * | 1967-04-17 | 1972-09-25 | Leder & Riemen Patent | |
| AT357857B (en) * | 1974-07-29 | 1980-08-11 | Bartelmuss Heinrich Ing | METHOD AND DEVICE FOR THE PRODUCTION OF A COATING COMPOSED FROM INDIVIDUAL OXIDE CERAMIC ELEMENTS |
| US4047993A (en) * | 1975-11-13 | 1977-09-13 | Heinrich Bartelmuss | Method of making an abrasion-resistant plate |
| FI791520A (en) * | 1978-05-12 | 1979-11-13 | Rudolf Poeschl | WITH SUCCESSFUL ORIGINAL FILTERS AND ENCLOSURE REQUIREMENTS FOR THE FARING PROCESSING |
| US4238286A (en) * | 1979-05-22 | 1980-12-09 | Rudolf Poeschl | Dewatering table bar for the wire cloth or felt in a pulp-dewatering machine |
-
1983
- 1983-02-24 DE DE3306457A patent/DE3306457C2/en not_active Expired
-
1984
- 1984-02-22 DE DE8484900849T patent/DE3463281D1/en not_active Expired
- 1984-02-22 JP JP59500975A patent/JPS60500819A/en active Pending
- 1984-02-22 WO PCT/DE1984/000040 patent/WO1984003314A1/en active IP Right Grant
- 1984-02-22 BR BR8405488A patent/BR8405488A/en unknown
- 1984-02-22 EP EP84900849A patent/EP0135544B1/en not_active Expired
- 1984-02-23 CA CA000448186A patent/CA1235010A/en not_active Expired
- 1984-02-24 IT IT12445/84A patent/IT1180437B/en active
- 1984-09-28 FI FI843839A patent/FI80093C/en not_active IP Right Cessation
- 1984-10-23 SU SU843805278A patent/SU1431685A3/en active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8097122B2 (en) | 2007-05-23 | 2012-01-17 | Astenjohnson, Inc. | Papermaking machine dewatering blade incorporating attachment mechanism |
Also Published As
| Publication number | Publication date |
|---|---|
| WO1984003314A1 (en) | 1984-08-30 |
| JPS60500819A (en) | 1985-05-30 |
| DE3306457C2 (en) | 1986-05-07 |
| IT8412445A1 (en) | 1985-08-24 |
| DE3463281D1 (en) | 1987-05-27 |
| EP0135544B1 (en) | 1987-04-22 |
| IT1180437B (en) | 1987-09-23 |
| IT8412445A0 (en) | 1984-02-24 |
| DE3306457A1 (en) | 1984-08-30 |
| SU1431685A3 (en) | 1988-10-15 |
| BR8405488A (en) | 1985-02-20 |
| FI80093C (en) | 1990-04-10 |
| FI843839L (en) | 1984-09-28 |
| FI80093B (en) | 1989-12-29 |
| FI843839A0 (en) | 1984-09-28 |
| EP0135544A1 (en) | 1985-04-03 |
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