CA1187270A - Procedure in the manufacturing of a stone roll for a paper machine - Google Patents
Procedure in the manufacturing of a stone roll for a paper machineInfo
- Publication number
- CA1187270A CA1187270A CA000398516A CA398516A CA1187270A CA 1187270 A CA1187270 A CA 1187270A CA 000398516 A CA000398516 A CA 000398516A CA 398516 A CA398516 A CA 398516A CA 1187270 A CA1187270 A CA 1187270A
- Authority
- CA
- Canada
- Prior art keywords
- roll
- stone
- stone roll
- temperature
- paper machine
- 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
- 239000004575 stone Substances 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000009828 non-uniform distribution Methods 0.000 abstract 1
- 239000010438 granite Substances 0.000 description 13
- 239000000463 material Substances 0.000 description 10
- 238000005259 measurement Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 2
- YSGSDAIMSCVPHG-UHFFFAOYSA-N valyl-methionine Chemical compound CSCCC(C(O)=O)NC(=O)C(N)C(C)C YSGSDAIMSCVPHG-UHFFFAOYSA-N 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000000332 continued effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000012417 linear regression Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
- D21F3/08—Pressure rolls
Landscapes
- Paper (AREA)
- Rolls And Other Rotary Bodies (AREA)
Abstract
METHOD FOR MANUFACTURING A
STONE ROLL FOR A PAPER MACHINE
ABSTRACT OF THE DISCLOSURE
A method for manufacturing a stone roll, particularly a press roll, of a paper machine is characterized by grinding the cylindrical shell of the stone roll to its final shape at substantially the same temperature at which the stone roll will operate in the paper machine. In this manner, a signifi-cant drawback, wherein stone rolls ground to perfect straight-ness and ultimate gloss tend to develop temperature-induced deflections which in turn cause non-uniform distribution of the nip pressure manifesting itself in a non-uniform moisture profile of the web treated in the press, is eliminated.
STONE ROLL FOR A PAPER MACHINE
ABSTRACT OF THE DISCLOSURE
A method for manufacturing a stone roll, particularly a press roll, of a paper machine is characterized by grinding the cylindrical shell of the stone roll to its final shape at substantially the same temperature at which the stone roll will operate in the paper machine. In this manner, a signifi-cant drawback, wherein stone rolls ground to perfect straight-ness and ultimate gloss tend to develop temperature-induced deflections which in turn cause non-uniform distribution of the nip pressure manifesting itself in a non-uniform moisture profile of the web treated in the press, is eliminated.
Description
'7~7~
BACKGROUND OF THE I~VENTI O~
The present invention relates generally to a method for manufacturing a stone roll, particularly a press roll, for a paper machine and, more particularly, to such a method where-in temperature-induced de1ections which occur in connection with the operation of the stone roll are reduced or eliminated.
~ aturally occurring stone material and, in particu-lar, grey granite, has been used for many years as the raw material from which paper machine rolls are manufactured.
Since flawless blocks of ~rey granite which are sufficiently large for the manufacture of paper machine rolls are not easily obtained, attempts have been made to fina substitute materials for granite. However, such attempts have failed to produce a material which can replace and supplant the use of stone material due to certain e~cellent properties found in the latter. Thus, granite has in fact generally been regarded as the best material from which to manufacture press rolls having a hard surface for the reason, among others, that a granite roll can be reconditioned and renewed without the sur~ace properties thereof being changed.
As an example of the sizes of stone rolls to date, the largest granite roll to applicants' knowledge which has been supplied to date has a diameter of 16QQmm and a shell surface lenyth of 9250mm and has been manufactured by Valmet Oy of Finland, assignee of the instant application.
"~
`~
3t~
The various constituents o~ the stone material of a stone roll may be distributecl within the manufactured roll in a non-uniform manner. This results in the coefficient of thermal expansion of the material differing at different points in the material. For this reason, the behavior of the roll at various temperatures cannot always be predicted with accuracy by calculations.
Indeed, in actual practice, it has been observed that a stone roll, even when ground to absolute straightness and finished to an ultimate gloss, will dev~lop deflections which are extremely detrimental when the stone roll operates as a press roll in a paper machine such, for example r as a smooth-surface central roll in a "Sym-Press" (Trademark of Valmet Oy), in conj~ction with which at least two press nips are defined. Such deflections in the stone roll result in an uneven distribution of the nip pressure in the press nips which in turn manifest itself in a non-uIliform moisture pro-file in the web being treated in the press.
SU~ lAFiY OF THE INVENTI (!N
It is an object o~ the present invention to provide a new and improved method for manufacturiny a stone roll, particularly a press roll, of a paper machine which eliminates the drawbacks described above.
~ riefly, in accordance with thc present invention, this object is achieved through the provision of a simple and 7~7~
efficient method for preventin~ deflections from occurrin~
during operation o~ the stone roll. To this end, the method of the invention is characterized in that the cylindrical shell of the stone roll is ground to its final shape ~t sub-stantially the same temperature at which the stone roll will operate in the paper machine.
DESCRIPTION OF THE DRA~INGS
A more complete appreciation of the present inven-tion and many of the attendant advantages thereof will be readily understood by reference to the following detailed description when considered in connection with the accompa-nying drawings in which:
FIG. 1 is an elevation view in section of a stone roll of the type with which the present invention is concerned;
and FIG. 2 is a graphical depiction illustrating the deflection of a granite roll with respect to the surface temperature thereof.
DESCRIPTIO~ OF THE PREFERRED E~QDIMENTS
Referrin~ now to the drawin~s, the structure of a stone roll of the type which is suited for manufacture in accordance with the method of the present invention i.s illus-trated in Fi~. 1. In this connection, reference is made to ~ilmish Patent No. 57989 issued to the assi~nee of the present application in which the structure and conventional method of manufacture of the stone roll shown in Fig. 1 is disclosed.
The stone roll illustrated in Fig~ 1 comprises an integral shell 10 formed of natural stone material such, for example, as grey ~ranite. The shell 10 ~hus comprises a one-piece granite cylinder in which a relatively large diameter central bore 14 is formed. The diameter o bore 14 may for instance be about 5~ of the diameter of the granite shell 10.
A tubular shaft 13 is situated within the bore 14 of granite shell 10. Journal pins 12a and 12b are affixed within respective ends o~ the tubular shaft 13 which carry bearing elements lla and llb at their respective ends. As seen in Fig. 1, end regions of the tubular shaft 13 extend beyond the ends of the granite shell 10 and annular end flanges 15a and 15b are moun.ed on the shaft end regions between which the granite shell 10 is clamped.
In order to center the granite shell 10 with respect to the center line C~C of the roll shaft, annular grooves are machined at the ends of the bore 1~ in which respective c~n-terin~ rings 16 are itted whose inner parts engage the outter surface of the tubular shaft 13.
In an investigation of the problems with which the present invention is concerned, deflections of the stone roll at room temperature and below room temperature were observed with the roll removed from the paper machine. The temperature was found to have a distinct influence on the deflection of 7~
the roll. Moreover, measurements of the deflections were con-tinued with the stone roll installed in its operatin~ posi-tion within the paper machine. More particularly, the initial cleflection measurements were taken with the surface temper-ature of the roll bein~ about ~20C which was substantially e~ual to the ambient temperature. After starting the opera-tion of the paper machine, the surface temperature of the roll and the correspondin~ deflection thereof were measured every 12 hours durin~ the first two days of operation. The time intervals between the measurements was thereafter increased to 24 hours and measurements taken for one week. For the last control measurement, the surface temperature of the roll had stabilized at about ~53C and the roll deflection was about 0.25mm as measured at the center of the roll.
The results of the measurements described above are graphically depicted in Fi~. ~ in which the values recited above are noted. A so-called linear regression line has been calculated for the deflection/temperature relationship observed on the basis of the m~asured values and is illustrated iII Fi~.
by the dash-dot line and the equation of tYhich for the particular roll e~amined is:
y - Q.0065~ ~ - 0.0848 + Q.0356 tYhere y is the ~eflection at the center of the roll in n~m and x is the surface temp~rature of the roll in C.
~ eferrin~ to Fi~. 2, the curve portion desi~nated 1 7~
represents the phase of the tests durin~ which the stone roll is cooling outdoors, the curve portion 2 represents ~he phase wherein the stone roll is warming up in a room temperature environment, and the curve portion 3 designates the test phase wherein the stone roll is installed in the paper machine.
As noted above, the dash-dot line represents the regression line havin~ the equation set ~orth above.
T t is noted that the coefficient of correlation r is 0.967168 and the percentage of explanation is 93.5. Under-standing that there will be some difference between the sur-face temperature of the roll and its average tem~erature resulting from the thermal capacity of the roll, the deflec-tion of the roll can be considered sukstantially entirely dependent on the temperature and will be substantially linear in the temperature range investigated.
As is known in the art, the outer sur~ace of the stone roll is finished in a grinding machine in which the roll, carried by its shaft, is rotated. The outer surface of the roll is yround to a cylindrical shape using a suitable tool, such as a grindin~ stone or a diamond with the surface rough-ness being on ~he order o~ about 1.6~ m. The roll is there-a~ter balanced in a known manner.
~ ccordin~ to the method of the invention, the stone roll, i~e., the ~ranite roll in the case of the illustrated embodiment, is heated in the roll grinding machine such, for ~ ~7~7~
example, by a water jet, substantially to the temperature at which the roll will operate in the paper machine. For example, i~ the roll is to be utilized in the press section of a paper machine, a water jet may be directed onto the roll in the grinding machine to elevate the te~perature of the roll to that temperature at which the roll will operate in the press section. The grinding of the roll to its final shape is carried out in accordance with the invention at this temper-ature, i.e., at a temperature corresponding to the operating temperature of the roll. In this manner, a compensation for the deviation in shape of the roll which would result from a non-uniform thermal expansion of the stone material from which the roll is constructed is achieved ~o that when the ground roll is installed in the press section of the paper machine no deflections will occur therein due to changes in temperature.
It is known that the normal operating temperature of a stone roll in the press section of a paper machine is in the range of about 35 to 40 C. In cases where the dewaterin~
action of the roll is boosted but through the provision of a so-called steam box, such as that disclosed in U.S. Patent 4,163,688 assigned to the assignee of the instant application, the operatin~ temperature of the stone roll will be in the range of about 50 to 55C.
It has been ~ound in practice that the operating temperature of a stone roll in its central region is slightly ~ ~L8t~
higher than the temperature in the region of the ends of the stone roll. ln order to take this practical aspect into account, the method of the present in~ention may be carried out in a manner such that the grinding of the stone roll is per~ormed with the central region thereof heated to a temp-erature corresponding to the operating temperature of the central region of the roll and with the end regions of the roll heated to temperatures corresponding tc the operating temperatures of these end regions when installed in the paper machine. Such a temperature profile simulating the tempera-ture profile of the roll during operation can be obtained during grinding such, for example, as by utilizing water jet apparatus from which a plurality of temperature-controlled water jets are applied to appropriate regions o~ the stone roll.
The temperature of the stone ~roll may be elevated to the operating temperature during grinding in ways other than that described above~ For e~ample, the stone roll can be situated during grinding in a basin containing water whose temperature is elevated in a controlled manner, the roll ro-tating within the basin during grinding.
It is also understood t~lat the method of the inven-tion may be utilized in connection with the manufacture of new stone rolls as ~Yell as in connection with reconditionin~
existing rolls.
obviously, numerous modifications and variations of the present invention are possible in the light of the above teachings. It is therefore to be wlderstood that within the scope of the claims appended hereto, the invention m~y be practiced otherwise than as specifically disclosed herein.
BACKGROUND OF THE I~VENTI O~
The present invention relates generally to a method for manufacturing a stone roll, particularly a press roll, for a paper machine and, more particularly, to such a method where-in temperature-induced de1ections which occur in connection with the operation of the stone roll are reduced or eliminated.
~ aturally occurring stone material and, in particu-lar, grey granite, has been used for many years as the raw material from which paper machine rolls are manufactured.
Since flawless blocks of ~rey granite which are sufficiently large for the manufacture of paper machine rolls are not easily obtained, attempts have been made to fina substitute materials for granite. However, such attempts have failed to produce a material which can replace and supplant the use of stone material due to certain e~cellent properties found in the latter. Thus, granite has in fact generally been regarded as the best material from which to manufacture press rolls having a hard surface for the reason, among others, that a granite roll can be reconditioned and renewed without the sur~ace properties thereof being changed.
As an example of the sizes of stone rolls to date, the largest granite roll to applicants' knowledge which has been supplied to date has a diameter of 16QQmm and a shell surface lenyth of 9250mm and has been manufactured by Valmet Oy of Finland, assignee of the instant application.
"~
`~
3t~
The various constituents o~ the stone material of a stone roll may be distributecl within the manufactured roll in a non-uniform manner. This results in the coefficient of thermal expansion of the material differing at different points in the material. For this reason, the behavior of the roll at various temperatures cannot always be predicted with accuracy by calculations.
Indeed, in actual practice, it has been observed that a stone roll, even when ground to absolute straightness and finished to an ultimate gloss, will dev~lop deflections which are extremely detrimental when the stone roll operates as a press roll in a paper machine such, for example r as a smooth-surface central roll in a "Sym-Press" (Trademark of Valmet Oy), in conj~ction with which at least two press nips are defined. Such deflections in the stone roll result in an uneven distribution of the nip pressure in the press nips which in turn manifest itself in a non-uIliform moisture pro-file in the web being treated in the press.
SU~ lAFiY OF THE INVENTI (!N
It is an object o~ the present invention to provide a new and improved method for manufacturiny a stone roll, particularly a press roll, of a paper machine which eliminates the drawbacks described above.
~ riefly, in accordance with thc present invention, this object is achieved through the provision of a simple and 7~7~
efficient method for preventin~ deflections from occurrin~
during operation o~ the stone roll. To this end, the method of the invention is characterized in that the cylindrical shell of the stone roll is ground to its final shape ~t sub-stantially the same temperature at which the stone roll will operate in the paper machine.
DESCRIPTION OF THE DRA~INGS
A more complete appreciation of the present inven-tion and many of the attendant advantages thereof will be readily understood by reference to the following detailed description when considered in connection with the accompa-nying drawings in which:
FIG. 1 is an elevation view in section of a stone roll of the type with which the present invention is concerned;
and FIG. 2 is a graphical depiction illustrating the deflection of a granite roll with respect to the surface temperature thereof.
DESCRIPTIO~ OF THE PREFERRED E~QDIMENTS
Referrin~ now to the drawin~s, the structure of a stone roll of the type which is suited for manufacture in accordance with the method of the present invention i.s illus-trated in Fi~. 1. In this connection, reference is made to ~ilmish Patent No. 57989 issued to the assi~nee of the present application in which the structure and conventional method of manufacture of the stone roll shown in Fig. 1 is disclosed.
The stone roll illustrated in Fig~ 1 comprises an integral shell 10 formed of natural stone material such, for example, as grey ~ranite. The shell 10 ~hus comprises a one-piece granite cylinder in which a relatively large diameter central bore 14 is formed. The diameter o bore 14 may for instance be about 5~ of the diameter of the granite shell 10.
A tubular shaft 13 is situated within the bore 14 of granite shell 10. Journal pins 12a and 12b are affixed within respective ends o~ the tubular shaft 13 which carry bearing elements lla and llb at their respective ends. As seen in Fig. 1, end regions of the tubular shaft 13 extend beyond the ends of the granite shell 10 and annular end flanges 15a and 15b are moun.ed on the shaft end regions between which the granite shell 10 is clamped.
In order to center the granite shell 10 with respect to the center line C~C of the roll shaft, annular grooves are machined at the ends of the bore 1~ in which respective c~n-terin~ rings 16 are itted whose inner parts engage the outter surface of the tubular shaft 13.
In an investigation of the problems with which the present invention is concerned, deflections of the stone roll at room temperature and below room temperature were observed with the roll removed from the paper machine. The temperature was found to have a distinct influence on the deflection of 7~
the roll. Moreover, measurements of the deflections were con-tinued with the stone roll installed in its operatin~ posi-tion within the paper machine. More particularly, the initial cleflection measurements were taken with the surface temper-ature of the roll bein~ about ~20C which was substantially e~ual to the ambient temperature. After starting the opera-tion of the paper machine, the surface temperature of the roll and the correspondin~ deflection thereof were measured every 12 hours durin~ the first two days of operation. The time intervals between the measurements was thereafter increased to 24 hours and measurements taken for one week. For the last control measurement, the surface temperature of the roll had stabilized at about ~53C and the roll deflection was about 0.25mm as measured at the center of the roll.
The results of the measurements described above are graphically depicted in Fi~. ~ in which the values recited above are noted. A so-called linear regression line has been calculated for the deflection/temperature relationship observed on the basis of the m~asured values and is illustrated iII Fi~.
by the dash-dot line and the equation of tYhich for the particular roll e~amined is:
y - Q.0065~ ~ - 0.0848 + Q.0356 tYhere y is the ~eflection at the center of the roll in n~m and x is the surface temp~rature of the roll in C.
~ eferrin~ to Fi~. 2, the curve portion desi~nated 1 7~
represents the phase of the tests durin~ which the stone roll is cooling outdoors, the curve portion 2 represents ~he phase wherein the stone roll is warming up in a room temperature environment, and the curve portion 3 designates the test phase wherein the stone roll is installed in the paper machine.
As noted above, the dash-dot line represents the regression line havin~ the equation set ~orth above.
T t is noted that the coefficient of correlation r is 0.967168 and the percentage of explanation is 93.5. Under-standing that there will be some difference between the sur-face temperature of the roll and its average tem~erature resulting from the thermal capacity of the roll, the deflec-tion of the roll can be considered sukstantially entirely dependent on the temperature and will be substantially linear in the temperature range investigated.
As is known in the art, the outer sur~ace of the stone roll is finished in a grinding machine in which the roll, carried by its shaft, is rotated. The outer surface of the roll is yround to a cylindrical shape using a suitable tool, such as a grindin~ stone or a diamond with the surface rough-ness being on ~he order o~ about 1.6~ m. The roll is there-a~ter balanced in a known manner.
~ ccordin~ to the method of the invention, the stone roll, i~e., the ~ranite roll in the case of the illustrated embodiment, is heated in the roll grinding machine such, for ~ ~7~7~
example, by a water jet, substantially to the temperature at which the roll will operate in the paper machine. For example, i~ the roll is to be utilized in the press section of a paper machine, a water jet may be directed onto the roll in the grinding machine to elevate the te~perature of the roll to that temperature at which the roll will operate in the press section. The grinding of the roll to its final shape is carried out in accordance with the invention at this temper-ature, i.e., at a temperature corresponding to the operating temperature of the roll. In this manner, a compensation for the deviation in shape of the roll which would result from a non-uniform thermal expansion of the stone material from which the roll is constructed is achieved ~o that when the ground roll is installed in the press section of the paper machine no deflections will occur therein due to changes in temperature.
It is known that the normal operating temperature of a stone roll in the press section of a paper machine is in the range of about 35 to 40 C. In cases where the dewaterin~
action of the roll is boosted but through the provision of a so-called steam box, such as that disclosed in U.S. Patent 4,163,688 assigned to the assignee of the instant application, the operatin~ temperature of the stone roll will be in the range of about 50 to 55C.
It has been ~ound in practice that the operating temperature of a stone roll in its central region is slightly ~ ~L8t~
higher than the temperature in the region of the ends of the stone roll. ln order to take this practical aspect into account, the method of the present in~ention may be carried out in a manner such that the grinding of the stone roll is per~ormed with the central region thereof heated to a temp-erature corresponding to the operating temperature of the central region of the roll and with the end regions of the roll heated to temperatures corresponding tc the operating temperatures of these end regions when installed in the paper machine. Such a temperature profile simulating the tempera-ture profile of the roll during operation can be obtained during grinding such, for example, as by utilizing water jet apparatus from which a plurality of temperature-controlled water jets are applied to appropriate regions o~ the stone roll.
The temperature of the stone ~roll may be elevated to the operating temperature during grinding in ways other than that described above~ For e~ample, the stone roll can be situated during grinding in a basin containing water whose temperature is elevated in a controlled manner, the roll ro-tating within the basin during grinding.
It is also understood t~lat the method of the inven-tion may be utilized in connection with the manufacture of new stone rolls as ~Yell as in connection with reconditionin~
existing rolls.
obviously, numerous modifications and variations of the present invention are possible in the light of the above teachings. It is therefore to be wlderstood that within the scope of the claims appended hereto, the invention m~y be practiced otherwise than as specifically disclosed herein.
Claims (6)
- THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
l. In a method for manufacturing a stone roll, particularly a press roll, of a paper machine, the improvement comprising:
grinding the cylindrical shell of the stone roll to its final shape while maintaining the temperature of the stone roll at substantially the same temperature at which the stone roll will operate in the paper machine, whereby the temperature induced deflections which would otherwise occur in the stone roll in connection with this operation are reduced or eliminated. - 2. The method of claim 1 wherein the cylindrical shell of the stone roll is ground to its final shape while the stone roll is at a temperature in the range of about 35° to 40°C.
- 3. The method of claim 1 wherein the stone roll is adapted for use in a press section of a paper machine in con-nection with which a steam box or the like is utilized and wherein the cylindrical shell of the stone roll is ground to its final shape at a temperature in the range of about 50°
to 55 C. - 4. The method of claim 1 wherein the grinding of the cylindrical shell of the stone roll is performed while maintaining different regions of the stone roll at different temperatures in the axial direction of the stone roll, the different temperatures substantially corresponding to the operating temperatures in the paper machine at the respective regions of the stone roll.
- 5. The method of claim 1 wherein the stone roll is heated to the operating temperature utilizing a water basin containing water whose temperature is controlled and in con-junction with which the roll that is being ground rotates.
- 6. The method of claim 1 wherein the stone roll is heated to the operating temperature utilizing water jets whose temperature is controlled and which are directed onto the roll that is being ground.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI810849 | 1981-03-19 | ||
| FI810849A FI61738C (en) | 1981-03-19 | 1981-03-19 | FOERFARANDE VID TILLVERKNING AV STENVALS FOER PAPPERSMASKIN |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1187270A true CA1187270A (en) | 1985-05-21 |
Family
ID=8514243
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000398516A Expired CA1187270A (en) | 1981-03-19 | 1982-03-16 | Procedure in the manufacturing of a stone roll for a paper machine |
Country Status (4)
| Country | Link |
|---|---|
| CA (1) | CA1187270A (en) |
| DE (1) | DE3208001A1 (en) |
| FI (1) | FI61738C (en) |
| SE (1) | SE454092B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5094911A (en) * | 1988-04-13 | 1992-03-10 | Sulzer Brothers Limited | Metal paper glazing roller for a paper machine |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3528588A1 (en) * | 1985-08-09 | 1987-02-19 | Voith Gmbh J M | ROLLER FOR EXERCISING A PRESSURE FORCE ON A FIBERGLASS web |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2395101A (en) * | 1944-07-18 | 1946-02-19 | John Waldron Corp | Surfacing metal rolls |
| DE2310483C2 (en) * | 1973-03-02 | 1975-03-06 | Fried. Krupp Huettenwerke Ag, 4630 Bochum | Method and device for regrinding a roll heated unevenly over its entire length |
| DE3009180C2 (en) * | 1980-03-11 | 1982-04-15 | Estel Hoesch Werke Ag, 4600 Dortmund | Control device for feeding the longitudinally displaceable grinding wheel of a roll grinding machine |
-
1981
- 1981-03-19 FI FI810849A patent/FI61738C/en not_active IP Right Cessation
-
1982
- 1982-03-05 DE DE19823208001 patent/DE3208001A1/en not_active Withdrawn
- 1982-03-16 CA CA000398516A patent/CA1187270A/en not_active Expired
- 1982-03-17 SE SE8201682A patent/SE454092B/en not_active IP Right Cessation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5094911A (en) * | 1988-04-13 | 1992-03-10 | Sulzer Brothers Limited | Metal paper glazing roller for a paper machine |
Also Published As
| Publication number | Publication date |
|---|---|
| SE454092B (en) | 1988-03-28 |
| SE8201682L (en) | 1982-09-20 |
| FI61738B (en) | 1982-05-31 |
| DE3208001A1 (en) | 1982-10-07 |
| FI61738C (en) | 1982-09-10 |
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