CA1265940A - Procedure and means for measuring the transversal distribution of tension in a web - Google Patents
Procedure and means for measuring the transversal distribution of tension in a webInfo
- Publication number
- CA1265940A CA1265940A CA000498828A CA498828A CA1265940A CA 1265940 A CA1265940 A CA 1265940A CA 000498828 A CA000498828 A CA 000498828A CA 498828 A CA498828 A CA 498828A CA 1265940 A CA1265940 A CA 1265940A
- Authority
- CA
- Canada
- Prior art keywords
- web
- transverse
- tension
- pick
- run
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000009826 distribution Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims description 20
- 230000008093 supporting effect Effects 0.000 claims description 27
- 238000012545 processing Methods 0.000 claims description 3
- 230000002301 combined effect Effects 0.000 claims 2
- 238000005259 measurement Methods 0.000 description 4
- 206010040954 Skin wrinkling Diseases 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- YUBJPYNSGLJZPQ-UHFFFAOYSA-N Dithiopyr Chemical compound CSC(=O)C1=C(C(F)F)N=C(C(F)(F)F)C(C(=O)SC)=C1CC(C)C YUBJPYNSGLJZPQ-UHFFFAOYSA-N 0.000 description 1
- OCYROESYHWUPBP-CIUDSAMLSA-N Pro-Ile Chemical compound CC[C@H](C)[C@@H](C([O-])=O)NC(=O)[C@@H]1CCC[NH2+]1 OCYROESYHWUPBP-CIUDSAMLSA-N 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 108010015796 prolylisoleucine Proteins 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/04—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Preliminary Treatment Of Fibers (AREA)
- Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
In order to measure the transverse distribution or pro-file of the longitudinal tension in a web, a run of the web is passed over a web support which changes the direction of run of the web over an angle, the web support being itself supported by support devices which are mutually spaced from each other in the transverse direction of the web. The load arising from the local tension of the web in the transverse direction thereof is sensed by a plurality of pick-ups which are mutually spaced from each other in the transverse direction of the web and which are situ-ated under respective ones of the support devices. The pick-ups generate signals from which the transverse distribution of longi-tudinal tension of the web is derived.
In order to measure the transverse distribution or pro-file of the longitudinal tension in a web, a run of the web is passed over a web support which changes the direction of run of the web over an angle, the web support being itself supported by support devices which are mutually spaced from each other in the transverse direction of the web. The load arising from the local tension of the web in the transverse direction thereof is sensed by a plurality of pick-ups which are mutually spaced from each other in the transverse direction of the web and which are situ-ated under respective ones of the support devices. The pick-ups generate signals from which the transverse distribution of longi-tudinal tension of the web is derived.
Description
r3 The present invention relates to methods and apparatus for measur~ng the transverse distrlbution or profile o~ -the lon-gitudinal tension in a web.
Deviat~ons of the longitudinal tension in a web in -the transverse direction, i.e., the transverse tension pro~ile or distribution, frequently cause dif-ficulties in the handliny o-f the web, particularly in paper processiny machines. An unsatis-factory transverse tension profile may result in wrinkles being formed in the web or even web breakage. Neither the transverse tension distribution in a web nor variations thereof can be obs-erved with sufficient reliability by conventional measurements of the thickness, mass and/or moisture of the web. PapermakerS
often re~er to poor web quality, loose margins, har~ ends, and the like, although these problems are often the result of the influence which the transverse tension profile of the web has on the web characteristics.
The transverse tension profile or distribution of a web has been measured using apparatus by which an acoustic sound emitting and measuring head is moved transversely over the web.
However, such conventional apparatus is bulky and difficult to use. Moreover, such conventional apparatus only supplies infor-mation with respect tc a single point in the web at any given instant of time.
The present invention provides improved methods and apparatus for measuring the transverse distribution of the longi-tudinal tension in a web.
The present invention also provides improved methods and apparatus for measuring the transverse distributlon of longi-tudinal tension in a web by which a continuous measurement can be carried out at all desired points of measurement simultaneously.
The present invention again provides improved methods ~.... . ..-. .: .
". . ~
.
and apparatus for measur~ng the transverse distribution of longi-tudinal tension in a web which do not require any m~ving parts.
The present invention again provides improved methods and apparatus for measuring the transverse distribution of longi-tudinal tension in a web which are not sensitive to environmental disturbances and which are applicable in a variety of web proces-sing machinesO
lo According to the present invention there is provided a method for measuring the transverse distribution of longitudinal tension in a web, comprising the steps of running the web under longitudinal tension in a longitudinal direction over a web sup-porting means selected from a discontinuous roll formed of rota-table rolls and a flexible strip means of which the surface carrying the web is curved thereby changing the direction of run of the web over a sufficient angle, said web supporting means having a length dimension extending transversely to the direction of web run and supporting the web over substantially the entire transverse dimension of the web, said web supportiny means being itself supported by support de~ices mutually spaced from each other in the transverse direction of the web; sensing a load arising from l~cal tension of the web in the transverse direction thereof by a plurality of pick-up means which are mutually spaced from each other in the transverse direction of the web and which are situated under each of said support devices; generating sig-nals indicative of the loads sensed by said pick-up means; and deriving the transverse distribution of the longitudinal tension in the web from said signals.
The present invention also provides an apparatus for measuring the transverse distribution of longitudinal tension in a web, comprising web supporting means selected from a discontin-uous roll formed of rotatable rolls and a flexible strip means of which the surface carrying the web is curved for supporting a run of a web and for changing the direction o run o the web over a , .~ .
. .
':
sufficient angle, said web supportiny means having a lenyth dim-ension extendin~ transversely to the dlrection of web run and supporting the web over substantially the entire transverse dimension of the web; support devices ~or supporting said ~leb supporting means, said support devices being mutually spaced from each other in the -transverse direction of the web run; a plur-ality of pick--up means Eor sensing the load arising from the local tension of the web in a transverse dlrection thereof and for generating signals indicative of the load sensed thereby, said pick-up means being mutually spaced from each other in the transverse direction of the web and situated under each of said support devices; and means i.nto which said signals are input for deriving the transverse distribution of the longitudinal tension in the web from said signals A.
Thus, in accordance with the present invention an arrangement is provided wherein a run of the web under longi-tudinal tension is passed over web supporting means which changes the direction of run of the web over an angle, the web supporting means being itsel~ supported by support devices which are mutu-ally spaced from each other in the transverse direction o~ the web. The load arising from the local tension of the web in the transverse direction thereof is sensed by a plurality of pick-up means which are mutually spaced from each other in the transverse direction of the web and which are situated under respective ones of the support devices~ The pick-up means generate signals which are indicative of the loads sensed by the pick-up means and from which the transverse tension distribution of the longitudinal tension in the web is derived.
Several important advantages are obtained by the method and apparatus of the invention. For example, the transverse pro-file of the longitudinal tension in the web can be measured from all desired points of measurement in the web at the sarne tlme.
The arrangement requlres no moving parts and is not sensitive to environmental disturbances. The method and apparatus of the invention are applicabl~ -to numerous web processing machines.
The present invention and many of the attendant advan-tages thereof will be readily understood by reference to the accompanying drawings, in which:-Fig. 1 is a schematic fron-t elevational view of one embodiment of the apparatus of the invention for performing the method of the invention;
Fig. 2 is a schematic side elevational view of the apparatus illustrated in Fig. l; and Fig. 3 is a schematic side elevational view of another embodiment of apparatus in accordance with the invention.
Referring now to the drawings wherein llke reference characters designate identical or corresponding parts throughout the several views, one embodiment of apparatus in accordance to the invention, generally deslgnated 10, comprises web supporting means in the form of a discontinuous roll 11 comprising a plur-ality of separate relatively short, rotatably mounted rolls lla-lle. The web P is arranged to run in a longitudinal direction over the sector of the discontinuous roll 11 so that the direc-tion of run of the web is changed over an angle ~C The rollslla-lle of the discontinuous roll 11 which constitutes the web - 3a -' ' '~ , -'' ..
.
:' ~
supporting means are provided wlth a plurality of support devices in the form of bearing assemhlies 12 which are mutually spaced from each other in the transverse direction of the web. The roll 11 has a length dimension extending transversely to the direc-tion of web run and supports the web over substantially the entire transverse dimension of the web.
The angle ~ is advantageously within the range of between about 20 to 90 and is preferably within the range of betw~en about 40 to 60.
According to the invention, pick-up means 13 are provided for sensing the load arising from,the local tension of the web P.
The pick-up means 13 are mutually spaced from each other in the transverse direction of the web and are situa~ed under respective ones of the bearing assemblies 12 of the discontinuous roll 11.
Referring to Fig. 1, the pick-up means 13 yenerate signals indicative of the load sensed by them and these signals are amplified in amplifiers 14 and input into cal~ulator or processor means 15 which processes the signals to generate a combined tension signal, designated 17. The amplified signals are also fed to suitable display means 16 which may comprise, for example, a line display composed of,light emitting diode columns, in the display 16, the transverse tension proile of the longitudinal of the web is displayed as a set of lighted columns.
Display means 16 may adapted to display the combined tension ~r~ c~ n ~ .
signal 17. Moreover, the G=b~d tension signal 17 representing the overall transverse tension in the web P may be used in A
feedback loop to control the tension adjustment of the web P.
The method of the invention may also be carried out using supporting means other than the di~continuous roll illus-trated in the embodiments of Figs. 1 and 2. For example, refer-ring to Fig. 3, a flexible strip 111 may be used in lieu of ~5~
the discontinuous roll ll. The flexible strip 111 iS curved in the direction of travel of the web P so that when the web P
is run over the strip ll', the direction of run of the web is changed over an angle correspondiny to angle ~ . The flexible strip ll' is itself supported by support devices 12' analogues to the bearing assemblies 12 of the embodiment of Figs. l and 2.
Pick-up means 13' are mutually spaced from each other in the transverse direction of the web and are situated under respective ones of -the support devices 12'.
The invention can he advantageously utilized to avoid wrinkling and breakage of the web. By monitoring the transverse tension profile, such as by observing the display 16, the speed and lon~itudinal tension at which the web P is run can be appro-priately adjusted for any particular web quality to avoid wrink-ling and breakage of the web. If the tension profile shown by the display 16 is not satisfactory, the web can be run in a cautious manner~ As noted above, the processed signals generated by the pick-up means 13 can be used in a feedback loop to control the runnin~ parameters of the paper machines. Other possibilities exist by which the invention can be used in the control or adjust-ment of the web run in various types of machines.
The method and apparatus of the invention can be applied to achieve different objects by appropriately selecting the dis-tance between the pick-up means 13, the types of pick-up means, the manner in which the pick-up means are fixed in place and other parameters in accordance with the requirements of each particular application or in accordance with the kind of web being run. It is also possible to obtain various transforms of the output of the pick-up means. For example, a differen-tial tension between the outer edge margins of the web can be obtained. The invention may also be used to calculate the .~2~i5~
values of certain desired characteristics, such as mean values, standard deviations or the like, as desired.
:i~
' ~' ~ ,. ' .
:~
.. . ;
Deviat~ons of the longitudinal tension in a web in -the transverse direction, i.e., the transverse tension pro~ile or distribution, frequently cause dif-ficulties in the handliny o-f the web, particularly in paper processiny machines. An unsatis-factory transverse tension profile may result in wrinkles being formed in the web or even web breakage. Neither the transverse tension distribution in a web nor variations thereof can be obs-erved with sufficient reliability by conventional measurements of the thickness, mass and/or moisture of the web. PapermakerS
often re~er to poor web quality, loose margins, har~ ends, and the like, although these problems are often the result of the influence which the transverse tension profile of the web has on the web characteristics.
The transverse tension profile or distribution of a web has been measured using apparatus by which an acoustic sound emitting and measuring head is moved transversely over the web.
However, such conventional apparatus is bulky and difficult to use. Moreover, such conventional apparatus only supplies infor-mation with respect tc a single point in the web at any given instant of time.
The present invention provides improved methods and apparatus for measuring the transverse distribution of the longi-tudinal tension in a web.
The present invention also provides improved methods and apparatus for measuring the transverse distributlon of longi-tudinal tension in a web by which a continuous measurement can be carried out at all desired points of measurement simultaneously.
The present invention again provides improved methods ~.... . ..-. .: .
". . ~
.
and apparatus for measur~ng the transverse distribution of longi-tudinal tension in a web which do not require any m~ving parts.
The present invention again provides improved methods and apparatus for measuring the transverse distribution of longi-tudinal tension in a web which are not sensitive to environmental disturbances and which are applicable in a variety of web proces-sing machinesO
lo According to the present invention there is provided a method for measuring the transverse distribution of longitudinal tension in a web, comprising the steps of running the web under longitudinal tension in a longitudinal direction over a web sup-porting means selected from a discontinuous roll formed of rota-table rolls and a flexible strip means of which the surface carrying the web is curved thereby changing the direction of run of the web over a sufficient angle, said web supporting means having a length dimension extending transversely to the direction of web run and supporting the web over substantially the entire transverse dimension of the web, said web supportiny means being itself supported by support de~ices mutually spaced from each other in the transverse direction of the web; sensing a load arising from l~cal tension of the web in the transverse direction thereof by a plurality of pick-up means which are mutually spaced from each other in the transverse direction of the web and which are situated under each of said support devices; generating sig-nals indicative of the loads sensed by said pick-up means; and deriving the transverse distribution of the longitudinal tension in the web from said signals.
The present invention also provides an apparatus for measuring the transverse distribution of longitudinal tension in a web, comprising web supporting means selected from a discontin-uous roll formed of rotatable rolls and a flexible strip means of which the surface carrying the web is curved for supporting a run of a web and for changing the direction o run o the web over a , .~ .
. .
':
sufficient angle, said web supportiny means having a lenyth dim-ension extendin~ transversely to the dlrection of web run and supporting the web over substantially the entire transverse dimension of the web; support devices ~or supporting said ~leb supporting means, said support devices being mutually spaced from each other in the -transverse direction of the web run; a plur-ality of pick--up means Eor sensing the load arising from the local tension of the web in a transverse dlrection thereof and for generating signals indicative of the load sensed thereby, said pick-up means being mutually spaced from each other in the transverse direction of the web and situated under each of said support devices; and means i.nto which said signals are input for deriving the transverse distribution of the longitudinal tension in the web from said signals A.
Thus, in accordance with the present invention an arrangement is provided wherein a run of the web under longi-tudinal tension is passed over web supporting means which changes the direction of run of the web over an angle, the web supporting means being itsel~ supported by support devices which are mutu-ally spaced from each other in the transverse direction o~ the web. The load arising from the local tension of the web in the transverse direction thereof is sensed by a plurality of pick-up means which are mutually spaced from each other in the transverse direction of the web and which are situated under respective ones of the support devices~ The pick-up means generate signals which are indicative of the loads sensed by the pick-up means and from which the transverse tension distribution of the longitudinal tension in the web is derived.
Several important advantages are obtained by the method and apparatus of the invention. For example, the transverse pro-file of the longitudinal tension in the web can be measured from all desired points of measurement in the web at the sarne tlme.
The arrangement requlres no moving parts and is not sensitive to environmental disturbances. The method and apparatus of the invention are applicabl~ -to numerous web processing machines.
The present invention and many of the attendant advan-tages thereof will be readily understood by reference to the accompanying drawings, in which:-Fig. 1 is a schematic fron-t elevational view of one embodiment of the apparatus of the invention for performing the method of the invention;
Fig. 2 is a schematic side elevational view of the apparatus illustrated in Fig. l; and Fig. 3 is a schematic side elevational view of another embodiment of apparatus in accordance with the invention.
Referring now to the drawings wherein llke reference characters designate identical or corresponding parts throughout the several views, one embodiment of apparatus in accordance to the invention, generally deslgnated 10, comprises web supporting means in the form of a discontinuous roll 11 comprising a plur-ality of separate relatively short, rotatably mounted rolls lla-lle. The web P is arranged to run in a longitudinal direction over the sector of the discontinuous roll 11 so that the direc-tion of run of the web is changed over an angle ~C The rollslla-lle of the discontinuous roll 11 which constitutes the web - 3a -' ' '~ , -'' ..
.
:' ~
supporting means are provided wlth a plurality of support devices in the form of bearing assemhlies 12 which are mutually spaced from each other in the transverse direction of the web. The roll 11 has a length dimension extending transversely to the direc-tion of web run and supports the web over substantially the entire transverse dimension of the web.
The angle ~ is advantageously within the range of between about 20 to 90 and is preferably within the range of betw~en about 40 to 60.
According to the invention, pick-up means 13 are provided for sensing the load arising from,the local tension of the web P.
The pick-up means 13 are mutually spaced from each other in the transverse direction of the web and are situa~ed under respective ones of the bearing assemblies 12 of the discontinuous roll 11.
Referring to Fig. 1, the pick-up means 13 yenerate signals indicative of the load sensed by them and these signals are amplified in amplifiers 14 and input into cal~ulator or processor means 15 which processes the signals to generate a combined tension signal, designated 17. The amplified signals are also fed to suitable display means 16 which may comprise, for example, a line display composed of,light emitting diode columns, in the display 16, the transverse tension proile of the longitudinal of the web is displayed as a set of lighted columns.
Display means 16 may adapted to display the combined tension ~r~ c~ n ~ .
signal 17. Moreover, the G=b~d tension signal 17 representing the overall transverse tension in the web P may be used in A
feedback loop to control the tension adjustment of the web P.
The method of the invention may also be carried out using supporting means other than the di~continuous roll illus-trated in the embodiments of Figs. 1 and 2. For example, refer-ring to Fig. 3, a flexible strip 111 may be used in lieu of ~5~
the discontinuous roll ll. The flexible strip 111 iS curved in the direction of travel of the web P so that when the web P
is run over the strip ll', the direction of run of the web is changed over an angle correspondiny to angle ~ . The flexible strip ll' is itself supported by support devices 12' analogues to the bearing assemblies 12 of the embodiment of Figs. l and 2.
Pick-up means 13' are mutually spaced from each other in the transverse direction of the web and are situated under respective ones of -the support devices 12'.
The invention can he advantageously utilized to avoid wrinkling and breakage of the web. By monitoring the transverse tension profile, such as by observing the display 16, the speed and lon~itudinal tension at which the web P is run can be appro-priately adjusted for any particular web quality to avoid wrink-ling and breakage of the web. If the tension profile shown by the display 16 is not satisfactory, the web can be run in a cautious manner~ As noted above, the processed signals generated by the pick-up means 13 can be used in a feedback loop to control the runnin~ parameters of the paper machines. Other possibilities exist by which the invention can be used in the control or adjust-ment of the web run in various types of machines.
The method and apparatus of the invention can be applied to achieve different objects by appropriately selecting the dis-tance between the pick-up means 13, the types of pick-up means, the manner in which the pick-up means are fixed in place and other parameters in accordance with the requirements of each particular application or in accordance with the kind of web being run. It is also possible to obtain various transforms of the output of the pick-up means. For example, a differen-tial tension between the outer edge margins of the web can be obtained. The invention may also be used to calculate the .~2~i5~
values of certain desired characteristics, such as mean values, standard deviations or the like, as desired.
:i~
' ~' ~ ,. ' .
:~
.. . ;
Claims (15)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method for measuring the transverse distribution of longitudinal tension in a web, comprising the steps of running the web under longitudinal tension in a longitudinal direction over a web supporting means selected from a discontinuous roll formed of rotatable rolls and a flexible strip means of which the surface carrying the web is curved thereby changing the direction of run of the web over a sufficient angle, said web supporting means having a length dimension extending transversely to the direction of web run and supporting the web over substantially the entire transverse dimension of the web, said web supporting means being itself supported by support devices mutually spaced from each other in the transverse direction of the web; sensing a load arising from local tension of the web in the transverse direction thereof by a plurality of pick-up means which are mutually spaced from each other in the transverse direction of the web and which are situated under each of said support devices; generating signals indicative of the loads sensed by said pick-up means; and deriving the transverse distribution of the longitudinal tension in the web from said signals.
2. The method of claim 1, wherein said web supporting means comprise a discontinuous roll formed of rotatably mounted rolls.
3. The method of claim 1, wherein said web supporting means is a flexible curved strip means of which the surface car-rying the web is curved.
4. The method of claim 1 including amplifying said signals generated by said pick-up means and inputting said ampli-fied signals into a display.
5. The method of claim 1 including combining said sig-nals generated by said pick-up means to obtain a combined trans-verse profile signal of longitudinal tension and using said com-bined transverse tension profile signal for controlling the run of the web.
6. The method of claim 1 including combining said sig-nals generated by said pick-up means to obtain a combined trans-verse profile signal of longitudinal tension and using said com-bined transverse tension profile signal to generate a display.
7. The method of claim 1, wherein said angle is in the range of between about 20° to 90°.
8. An apparatus for measuring the transverse distribu-tion of longitudinal tension in a web, comprising web supporting means selected from a discontinuous roll formed of rotatable rolls and a flexible strip means of which the surface carrying the web is curved for supporting a run of a web and for changing the direction of run of the web over a sufficient angle, said web supporting means having a length dimension extending transversely to the direction of web run and supporting the web over substan-tially the entire transverse dimension of the web; support devices for supporting said web supporting means, said support devices being mutually spaced from each other in the transverse direction of the web run; a plurality of pick-up means for sens-ing the load arising from the local tension of the web in a transverse direction thereof and for generating signals indica-tive of the load sensed thereby, said pick-up means being mutu-ally spaced from each other in the transverse direction of the web and situated under each of said support devices; and means into which said signals are input for deriving the transverse distribution of the longitudinal tension in the web from said signals.
9. The combination of claim 8, wherein said web sup-porting means comprise a discontinuous roll formed by rotatably mounted rolls.
10. The combination of claim 8, wherein said web sup-porting means is a flexible curved strip means of which the sur-face carrying the web is curved.
11. The combination of claim 8 including amplifying means for amplifying said signals generated by said pick-up means.
12. The combination of claim 8 including means for pro-cessing said signals generated by said pick-up means and for gen-erating a combined transverse tension profile signal.
13. The combination of claim 8 including display means for displaying the derived transverse distribution of longitudi-nal tension.
14. The combination of claim 13, wherein said display means comprise a line display composed of columns of light emit-ting diodes.
15. The combination of claim 8, wherein said angle is in the range of between about 20° to 90°.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI845182 | 1984-12-31 | ||
| FI845182A FI845182L (en) | 1984-12-31 | 1984-12-31 | PROOF OF ORGANIZATION FOR THE MAINTENANCE OF THE ENTIRE BANANS SPA. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1265940A true CA1265940A (en) | 1990-02-20 |
Family
ID=8520133
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000498828A Expired - Fee Related CA1265940A (en) | 1984-12-31 | 1985-12-31 | Procedure and means for measuring the transversal distribution of tension in a web |
Country Status (3)
| Country | Link |
|---|---|
| CA (1) | CA1265940A (en) |
| FI (1) | FI845182L (en) |
| SE (1) | SE8506144L (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6481275B1 (en) | 1998-07-01 | 2002-11-19 | Metso Paper Automation Oy | Method and apparatus for measuring the tension of a moving web |
-
1984
- 1984-12-31 FI FI845182A patent/FI845182L/en not_active Application Discontinuation
-
1985
- 1985-12-27 SE SE8506144A patent/SE8506144L/en not_active Application Discontinuation
- 1985-12-31 CA CA000498828A patent/CA1265940A/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6481275B1 (en) | 1998-07-01 | 2002-11-19 | Metso Paper Automation Oy | Method and apparatus for measuring the tension of a moving web |
Also Published As
| Publication number | Publication date |
|---|---|
| FI845182A0 (en) | 1984-12-31 |
| FI845182L (en) | 1986-07-01 |
| SE8506144D0 (en) | 1985-12-27 |
| SE8506144L (en) | 1986-07-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |