CA1324281C - Endless wire for pulp thickener - Google Patents
Endless wire for pulp thickenerInfo
- Publication number
- CA1324281C CA1324281C CA000597111A CA597111A CA1324281C CA 1324281 C CA1324281 C CA 1324281C CA 000597111 A CA000597111 A CA 000597111A CA 597111 A CA597111 A CA 597111A CA 1324281 C CA1324281 C CA 1324281C
- Authority
- CA
- Canada
- Prior art keywords
- wire
- belt
- rolls
- roll
- stock
- 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
- 239000002562 thickening agent Substances 0.000 title claims abstract description 11
- 239000000853 adhesive Substances 0.000 claims abstract description 22
- 230000001070 adhesive effect Effects 0.000 claims abstract description 22
- 239000003292 glue Substances 0.000 claims description 13
- 230000003014 reinforcing effect Effects 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 4
- 239000012779 reinforcing material Substances 0.000 claims description 4
- 230000004323 axial length Effects 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 2
- 239000004800 polyvinyl chloride Substances 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000010276 construction Methods 0.000 description 4
- 239000000725 suspension Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 2
- 239000013536 elastomeric material Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000008719 thickening Effects 0.000 description 2
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 241000022563 Rema Species 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 239000004848 polyfunctional curative Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000009958 sewing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
- D21F1/80—Pulp catching, de-watering, or recovering; Re-use of pulp-water using endless screening belts
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/18—De-watering; Elimination of cooking or pulp-treating liquors from the pulp
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
- Structure Of Belt Conveyors (AREA)
- Belt Conveyors (AREA)
Abstract
Abstract A high speed stock thickener has a foraminous endless wire. The stock thickener is of the type in which an open mesh endless wire is trained over a pair of rolls and paper stock to be thickened is applied between the wire and the rolls and is carried on an inside surface of the wire for dewatering, particularly at the regions where the stock is carried between the wire and a roll. The improved wire is formed with a width greater than that of the rolls with a marginal edge of the wire extending beyond the face of the rolls. A guide belt is attached at each of the marginal edges of the wire and runs with a side wall in engagement with the end of the adjacent roll. The guide belts are attached to the wire by an adhesive bond between the backs of the belts and the adjacent wire surfaces, and by a continuous thread which is sewn through each belt from the bottom of the belt and through the back thereof and into the wire.
Description
~` ~
~ ~32~28~
.. . .
ENDLESS WIRE FOR P~LP THICKENER
The invention is related to the apparatus for thickenin~ pulp and paper stock shown in the U. S. Patent of Seifert et al, No. 4,722,793 issued February 2, 1988. This ` 5 apparatus employs an endless wire rained over a pair of l rolls.
,~! The Seifert et al patent discloses that in order to guide an endless wire so that it will travel in a path perpendicular to the axes of the two rolls, the wire may be ~ 10 provided along one or both edges of its inner surface with a - strip, e. g. a V-belt, which fits in a peripheral groove in each of the rolls. In the practical development of the apparatus of that patent, however, considerable difficulty was encountered in securing this guiding strip to the wire in ~' 15 a manner which would prevent its separation from the wire under the stresses of use, particularly at the relatively high speeds contemplated for the apparatus, namely speeds as high as 914 meters per minute. While it would be presumed that this would not be a problem in view of the improvements in recent years in the technology of adhesives, no adhesive could be found for securing such a guiding strip to a woven wire which would hold up for a satisfactory period even under prototype laboratory testing conditions.
,~ The forces acting on the wire, to which the guide belts are attached, are not only the centrifugal force due to the weight of the stock carried on the inside wire surface, but also is due to the quantity of water which forms part of the stock which is applied at high velocity by the headbox.
A major portion of this water must pass through the wire `~ 30 during its first turn about the roll, and the greatest i t ',;~ ~
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stresses against the wire and against the guides belts occurs at this location. Further, in the apparatus of the Seifert et al patent, the partiallv dewatered stock is carried from :~s the first roll to the second roll on the inside surface of ~, 5 the wire, and the wire holds the stock from falling away or being flung out from the surfaces of both of the rolls. For these reasons the wire is subject to forces which tend to bulge it away from the rolls and place both shear and tensile loading on the connection between the wire mesh and ~ 10 the guide belts.
;~ The invention can be described as an improved wire ~, for a high speed type stock thickener for papermaker's stock in which the wire is trained over at least two rolls and the paper stock is applied between the endless wire and at least t 15 one of the rolls. The stock is carried on an inside surface of the wire for dewatering at the regions where the stock is carried between the wire and one of the rolls, characterized by the fact that the wire is formed with a width which is greater than the axial face length of the rolls so that a marginal edge of the wire extends beyond the ends of the rolls, and a guide belt is positioned at each ~arginal edge of the wire so that the belt will run adjacent the ends of the rolls. The guide belt is fastened to the wire by an adhesive bond between the back of the belt and the wire surface in which the bonding glue penetrates the wire 'openings while forming a chemical bond to the belt, and ~,further characterized by a continuous thread sewn to the belt from the bottom and through the back and into the wire, which thread extends along the length of the belt.
~ ' .
:
.
`: 1324281 . .
-^ The invention is further characterized by a high speed type stock thickener which employs an endless wire as preYiously described. Further inventive features include the -, employment of flexible backing strips which are positioned -, S opposite the belts and sewn to the belt and to the wire and glue bonded in place. The flexible backing strip may comprise a second V-belt in inverted relation to the first V-' belt.
. .
In order that the invention may be more readily understood, reference will now be made to the accompanying drawings, in which:
: ;.
Fig. 1 tprior art) is a som~hat diagrammatic side vie~, pI~1y ~'f, in section, of thickening apparatus with which the invention 1 is used;
'i 15 Fig. 2(prioriart) isian end view looking frcm right to left in , Fig. 1 and partly broken away in section;
Fig. 3 is an enlarged fragment of Fig. 2;
Figs. 4 and 5 are enlarged fragmentary sections illustrating modifications of the construction shown in :~ 20 Fig. 3;
Fig. 6 is a view similar to Fig. 5 showing an embodiment of the invention wherein a guide belt is located on each side of the wire;
Fig. 7 is a perspective view similar to Fig. 6 showing a variation in the location of the guide belts on `;1 both sides of the wire; and Figs. 8-12 are views similar to Fig. 4 showing other embodiments of the invention.
Figs. 1-2 illustrate the principal structure of the thickening apparatus described in ~. S. Patent No.
~!
, .~', .,,.~j i ;-',j i, `, .
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,:' 4,722,793. It includes a frame comprising two columns 10 and 11 on each side connected by side beams 12 and cross braces s 13. The two large rolls 20 and 22 are mounted adjacent opposite ends of the frame, the roll 22 being shown as mounted by pillow block bearings 23 on the tops of columns 10 and 11. This roll 22 is a dri~en roll, through the belt ;, drive indicated generally at 24 by a motor 25 mounted on the ~, cross brace 13 between the columns 10 and 11. The rolls 20 1?, and 22 may have liquid-impervious outer surfaces, buti 10 preferably these surfaces are grooved as indicated by the helical grooves 26 in Fig. 3.
An endless loop of woven foraminous "wire" 30 is ... .
trained around the rolls 20 and 22 and defines therewith a ') space in which the other operating parts of the apparatus are located. Preferably the wire 30 will consist of any plastic material currently used for paper machine wires, e.g.
polyester. Roll 20 has an adjustable mounting on the frame which includes means for tensioning the wire, each of the ;~ journals of the roll 20 being mounted by a pillow block 31 on a base 33 which is in turn mounted for sliding movement on the side beam 12. A pair of jack screws 35 connected between bases 33 and the adjacent columns lO and 11 cause and control this movement to effect corresponding control of the tension in wire 30.
A headbox 40 is mounted on the same base members 33 as the roll 20 so that it maintains a fixed spacing with ,~ respect to roll 20. This headbox is shown as of an open type including lower and upper walls 41 and 42 which extend upwardly to define a spout through which stock is discharged into the wedge zone 44 defined by the upper run of wire 30 . `
;~
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, .................................. .
~32'~2~
.
approaching roll 20 and the surface of the roll itself. The stock to be thickened is fed to the headbox by any convenient feed line (not shown) from the usual stock supply pump ~not shown).
At the other end of the space defined by the upper and lower runs of the wire 30 and the rolls 20 and 22 is a trough 50 having a screw conve~yor 51 mounted in the bottom thereof for receiving thickened pulp from the surface of roll 22 in the wedge zone 52 defined by the roll surface and the upper run of wire 30 leaving this roll. The trough 50 includes a doctor 55 extending along its downstream edge which removes the thickened pulp from the surface of roll 22.
An inclined wall 56 along the front edge of trough 50 prevents this pulp from being thrown beyond the trough, and the screw 51 forces the accumulated pulp to a chute 57 at the back of the machine which leads to the next station in the system.
In the operation of this apparatus, the pulp suspension to be thickened is constantly supplied to the wedge zone 44 from the headbox 40, and since a substantial volume of water will be forced through the wire before the wire reaches the roll 20, the resulting partially dewatered pulp i~ trapped between the wire 30 and the portion of the ¦ surface of roll 20 wrapped thereby. Proper control of wire tension contributes to the effectiveness of the initial dewatering of the suspension in the wedge zone 44 as the pulp travels therefrom around the surface of roll 20.
~ It is desirable that the wire tension not be so ; high as to make it difficult for the preliminarily thickened suspension to enter the space between the wire and the ~, .; . .
~` ~ 32~2~-~
, -6-surface of roll 20. Thus if the wire tension is comparatively low, e. g. 1-40 lbs. per linear inch (0.15 to 5.9 Kg/cm), the pulp which has been subjected to initial dewatering as it approaches the small end of the wedge zone 44 will be more readily trapped between the wire and the roll 20 than if the wire is very tight.
The wire 30 serves as a filter that holds and carries the fiber on its inner surface against the action of centrifugal force, which is the major factor causing ' 10 dewatering of the retained pulp at wire speeds of 640-914 ; meters per minute using rolls 20 and 22 which are 24 inches in diameter. The white water expressed through the wire is thrown into a trough 60 which extends under both rolls 20 and 22 and is provided with a drain outlet 61. A two-piece hood 62 is mounted on the frame above the apparatus as a whole, and it fits into the top of the trough 60 so that any water 7, hitting the inner surface of this hood will drip therefrom into the trough.
r~l It is important, particularly in view of the high wire speeds contemplated by the invention, and due to the forces against the wire, that the wire 30 be guided such that it travels along a course perpendicular to the axes of these two rolls. This guiding action is achieved by means of a pair of V-belts 70 adjacent opposite side edges of the inside surface of the wire 30.
;~ While these belts could fit into grooves in the ' surfaces of rolls 20 and 22, as disclosed in U. S. Patent No.
4,722,793, preferred results have been obtained with the wire sufficiently wider than the axial dimensions of rolls 20 and 22 to locate these belts in overhanging relation with the ~3 ., "~' . : ' ~`
2 ~ 2 ~ ~
' , . .
':i j ends of the faces of rolls 20 and 22, as shown in Fig. 3, so -~ that each of these roll ends acts as a shoulder 72 which will -, engage the inner side surface of the adjacent belt 70 if the wire should drift to one side or the other.
; 5 In the development of the apparatus shown in Fig.
`~ 1, it was discovered that a combination of gluing and ~ stitching would secure the belts to the wire and successfully q withstand the stresses applied in test operations. This connection would last as long as the useful life of the endless wire itself. Good results have been obtained using a ~; belt of the V-belt shape as shown in Fig. 3, formed of polyvinyl chloride, with a radial dimension of 1.59 cm and a thickness ranging from 2~22 cm to 1.71 cm.
It is important that the stitching 75 comprise a thread or line of sufficient strength, and particularly toughness, to withstand the repeated bending and flexing of the belt 70 as they travel around the rolls 20 and 22, and the thread must also be highly water resistant. From these standpoints, satisfactory results have been obtained using woven or monofilament 50 lb. (23 Kg) test fishing line, but other types of thread or wire of comparable mechanical attributes could be used, as well as other for~s of mechanical conventions, such as rivets.
In addition to the stitching 75, it has been found desirable to provide a glued connection between each belt 70 and the wire 30. More specifically, before attaching a belt to the wire, the outer edge portion of the wire is ~; impregnated with urethane adhesive over a band approximately 3.8 cm wide which extends to and includes the outer edge of ~i 30 the wire, as indicated at 77 in Fig. 3.
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r~ . -:. , .
. ~ . .
;;~ , ~ ', .
` ~32~2~1 After this adhesive material has dried, the wide edge of the belt 70 is glued thereto, preferably with an adhesive which will chemically bond the belt with the adhesive, impregnated strip of the wire. Adhesives found satisfactory for this purpose are those sold under the trade name "PU Adhesive" by Sigling America, Inc., Englewood, ~, N.J., U.S.A., and under the trade name Rema S.C.-2000" by 1 Rema Division of Remaco, Northvale, N.J., U.S.A., in each i case using the hardener recommended by the manufacturer with the adhesive. The joint is then completed by stitching the belt to the wire, as by means of a sewing machine such as is used in shoe-making operations.
`~ The wire 30 is sufficiently wider than the axial length of the faces of rolls 20 and 22 to provide overhanging marginal portions of the wire at both ends of the rolls which will carry the belts 70. With a belt of the cross sectional ~` dimensions noted above, satisfactory results have been obtained with the wire 7.50 cm wider than the length of each of the rolls, and with a strip of wire 0.634 cm wide extending beyond each belt, thereby providing a total clearance of 1.3 cm for each of the rolls between the pair of belts 70. Thus so long as the wire runs in a straight line, there may be no contact between either roll and either of the belts 70, but if the belt should wander slightly to one side or the other, engagement between the end of a roll and the inclined adjacent surface of one of the belts 70 will result in a camming action causing the belt to return to substantially centered relation with both rolls.
The strips of adhesive 77 extending to the outer edges of the wire strengthen and protect these portions of 132~2~
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~- the wlre from fraying in use and contribute to the useful ` life of each wire.
~ Figs. 4-12 illustrate modified constructions which r', embody the invention as described above~ Thus in Fig. 4, a "~ 5 strip 80 of reinforcing material, which may be of the same ;~ elastomeric material as the belt 70 but somewhat greater ~` width, is positioned on the opposite side of the wire 30 from the belt 70. The stitching 81 traverses both the belt 70 and , the reinforcing strip 80 to secure these two elements together through the wire. The junction between these parts may also be reinforced by impregnating the portion of the ~j wire underlying the strip 80 with glue, as indicated at 77.
., .
The construction shown in Fig. 5 is similar to that in Fig. 4 except that the guide belt 85 includes a V-belt ,,~f~15 section 86 and marginal flanges 87 which cooperate with the wider portion of the V-section 86 to provide an increased area of contact with the wire 30. In addition, a strip 80 of reinforcing material of the same width as the maximum width of belt 85 i8 positioned on the opposite side of the wire 30 as in Fig. 4. The stitching 88 traverses both the V-section 86 of belt 85 and its side flanges portions as well as the reinforcing strip 80 and the wire. As in Fig. 4, it is desirable to reinforce the interconnection between these parts by impregnating the portion of the wire between the strip 80 and belt 85 with glue.
Fig. 6 shows the application of the invention to a ~, wire 30 which may be used with either side outermost. A
second belt 90 of the same cross sectional configuration as the belt 85 is placed on the other side of the wire from the ~ 30 belt 85, and the two belts are fastened to each other and the .
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.
;
wire by stitching 92 which traverses all three elements as shown. The intero~ection between the tw~ be1ts may also be s reinforced by impregnating the portion of wire therebetween with glue.
; 5 Fig. 7 illustrates a ~odification of the invention ;, wherein guide belts 85 and 90 are provided on both sides of the wire but in offset relation, and with the connection between each of these belts and the wire provided with a . reinforcing strip 80 as described in connection with Figs. 4 and 5. Fig. 7 also illustrates both of belts 85 and 90 as provided with multiple V-shaped s1its 9S for relieving the tension and compression forces during use. With belts on both sides of the wire loop, the peripheral dimension of the 3, belt on the outside of the wire will be greater than that of the inside belt, but this relationship will be reversed when the wire is turned inside out. The slits 95 cooperate with the elastomeric properties of the belts to compensate for these dimensional differences, and similar slits should be provided in the belts 85 and 9~ in Fig. 6.
Fig. 8 shows a form of the invention wherein the guiding V-belt 100 includes a flange portion 101 on only one , side thereof, and the belt is secured to the wire 30 by superimposing the flange 101 on a marginal strip of the wire 30 and securing these overlying layer~ together by stitching 102, preferably reinforced by glue impregnating the portion of the wire in contact with belt flange 101. It will be understood that this construction is duplicated at the other side of the wire.
~ In Fig. 9, the wire 30 is provided at each side s~ 30 with a guide belt 110 formed by rolling a marginal strip of .~, ";~
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, wire on itself into the form of a V-belt. This rolled portion of the wire is secured together by ~eans of stitching s 111, and its for~ation may also be aided by a center core, preferably of elastomeric material and V-shape in section.
S Fig. 10 shows a form of the invention similar to that in Fig. 9 except that the core 115 is a V-belt, and it is secured to the edge of the wire 30 by wrapping it in a marginal strip of the wire, with the resulting assembly secured together and to the wire by stitching 116.
Figs. 11 and 12 show two other forms of guiding belt which may be secured along each edge of the wire 30. In `J Fig. 11, the guiding belt 120 is of right angled form, and it is secured to the edge of the wire by folding a marginal strip of wire around it and by stitching 121 as shown.
Preferably the overlying strip of wire will be impregnated with glue at the time of assembly. The guide belt 125 in Fig. 12 is of rectangular section and is similarly partially ?~ enclosed by a strip of wire 30 to which it is secured by stitching 126, with the aid of adhesive impregnating that portion of the wire which is contact with belt 125.
:
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., ~- : :
~ ~32~28~
.. . .
ENDLESS WIRE FOR P~LP THICKENER
The invention is related to the apparatus for thickenin~ pulp and paper stock shown in the U. S. Patent of Seifert et al, No. 4,722,793 issued February 2, 1988. This ` 5 apparatus employs an endless wire rained over a pair of l rolls.
,~! The Seifert et al patent discloses that in order to guide an endless wire so that it will travel in a path perpendicular to the axes of the two rolls, the wire may be ~ 10 provided along one or both edges of its inner surface with a - strip, e. g. a V-belt, which fits in a peripheral groove in each of the rolls. In the practical development of the apparatus of that patent, however, considerable difficulty was encountered in securing this guiding strip to the wire in ~' 15 a manner which would prevent its separation from the wire under the stresses of use, particularly at the relatively high speeds contemplated for the apparatus, namely speeds as high as 914 meters per minute. While it would be presumed that this would not be a problem in view of the improvements in recent years in the technology of adhesives, no adhesive could be found for securing such a guiding strip to a woven wire which would hold up for a satisfactory period even under prototype laboratory testing conditions.
,~ The forces acting on the wire, to which the guide belts are attached, are not only the centrifugal force due to the weight of the stock carried on the inside wire surface, but also is due to the quantity of water which forms part of the stock which is applied at high velocity by the headbox.
A major portion of this water must pass through the wire `~ 30 during its first turn about the roll, and the greatest i t ',;~ ~
~ ' ,,` 3 ~
1",~, ,,,,,~
,.',~1 ~ 3~?~
.~, ,, " j~:
.~ `~. .. , : ` :
,,, ~32~2~1 ":~
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stresses against the wire and against the guides belts occurs at this location. Further, in the apparatus of the Seifert et al patent, the partiallv dewatered stock is carried from :~s the first roll to the second roll on the inside surface of ~, 5 the wire, and the wire holds the stock from falling away or being flung out from the surfaces of both of the rolls. For these reasons the wire is subject to forces which tend to bulge it away from the rolls and place both shear and tensile loading on the connection between the wire mesh and ~ 10 the guide belts.
;~ The invention can be described as an improved wire ~, for a high speed type stock thickener for papermaker's stock in which the wire is trained over at least two rolls and the paper stock is applied between the endless wire and at least t 15 one of the rolls. The stock is carried on an inside surface of the wire for dewatering at the regions where the stock is carried between the wire and one of the rolls, characterized by the fact that the wire is formed with a width which is greater than the axial face length of the rolls so that a marginal edge of the wire extends beyond the ends of the rolls, and a guide belt is positioned at each ~arginal edge of the wire so that the belt will run adjacent the ends of the rolls. The guide belt is fastened to the wire by an adhesive bond between the back of the belt and the wire surface in which the bonding glue penetrates the wire 'openings while forming a chemical bond to the belt, and ~,further characterized by a continuous thread sewn to the belt from the bottom and through the back and into the wire, which thread extends along the length of the belt.
~ ' .
:
.
`: 1324281 . .
-^ The invention is further characterized by a high speed type stock thickener which employs an endless wire as preYiously described. Further inventive features include the -, employment of flexible backing strips which are positioned -, S opposite the belts and sewn to the belt and to the wire and glue bonded in place. The flexible backing strip may comprise a second V-belt in inverted relation to the first V-' belt.
. .
In order that the invention may be more readily understood, reference will now be made to the accompanying drawings, in which:
: ;.
Fig. 1 tprior art) is a som~hat diagrammatic side vie~, pI~1y ~'f, in section, of thickening apparatus with which the invention 1 is used;
'i 15 Fig. 2(prioriart) isian end view looking frcm right to left in , Fig. 1 and partly broken away in section;
Fig. 3 is an enlarged fragment of Fig. 2;
Figs. 4 and 5 are enlarged fragmentary sections illustrating modifications of the construction shown in :~ 20 Fig. 3;
Fig. 6 is a view similar to Fig. 5 showing an embodiment of the invention wherein a guide belt is located on each side of the wire;
Fig. 7 is a perspective view similar to Fig. 6 showing a variation in the location of the guide belts on `;1 both sides of the wire; and Figs. 8-12 are views similar to Fig. 4 showing other embodiments of the invention.
Figs. 1-2 illustrate the principal structure of the thickening apparatus described in ~. S. Patent No.
~!
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,:' 4,722,793. It includes a frame comprising two columns 10 and 11 on each side connected by side beams 12 and cross braces s 13. The two large rolls 20 and 22 are mounted adjacent opposite ends of the frame, the roll 22 being shown as mounted by pillow block bearings 23 on the tops of columns 10 and 11. This roll 22 is a dri~en roll, through the belt ;, drive indicated generally at 24 by a motor 25 mounted on the ~, cross brace 13 between the columns 10 and 11. The rolls 20 1?, and 22 may have liquid-impervious outer surfaces, buti 10 preferably these surfaces are grooved as indicated by the helical grooves 26 in Fig. 3.
An endless loop of woven foraminous "wire" 30 is ... .
trained around the rolls 20 and 22 and defines therewith a ') space in which the other operating parts of the apparatus are located. Preferably the wire 30 will consist of any plastic material currently used for paper machine wires, e.g.
polyester. Roll 20 has an adjustable mounting on the frame which includes means for tensioning the wire, each of the ;~ journals of the roll 20 being mounted by a pillow block 31 on a base 33 which is in turn mounted for sliding movement on the side beam 12. A pair of jack screws 35 connected between bases 33 and the adjacent columns lO and 11 cause and control this movement to effect corresponding control of the tension in wire 30.
A headbox 40 is mounted on the same base members 33 as the roll 20 so that it maintains a fixed spacing with ,~ respect to roll 20. This headbox is shown as of an open type including lower and upper walls 41 and 42 which extend upwardly to define a spout through which stock is discharged into the wedge zone 44 defined by the upper run of wire 30 . `
;~
S
, .................................. .
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.
approaching roll 20 and the surface of the roll itself. The stock to be thickened is fed to the headbox by any convenient feed line (not shown) from the usual stock supply pump ~not shown).
At the other end of the space defined by the upper and lower runs of the wire 30 and the rolls 20 and 22 is a trough 50 having a screw conve~yor 51 mounted in the bottom thereof for receiving thickened pulp from the surface of roll 22 in the wedge zone 52 defined by the roll surface and the upper run of wire 30 leaving this roll. The trough 50 includes a doctor 55 extending along its downstream edge which removes the thickened pulp from the surface of roll 22.
An inclined wall 56 along the front edge of trough 50 prevents this pulp from being thrown beyond the trough, and the screw 51 forces the accumulated pulp to a chute 57 at the back of the machine which leads to the next station in the system.
In the operation of this apparatus, the pulp suspension to be thickened is constantly supplied to the wedge zone 44 from the headbox 40, and since a substantial volume of water will be forced through the wire before the wire reaches the roll 20, the resulting partially dewatered pulp i~ trapped between the wire 30 and the portion of the ¦ surface of roll 20 wrapped thereby. Proper control of wire tension contributes to the effectiveness of the initial dewatering of the suspension in the wedge zone 44 as the pulp travels therefrom around the surface of roll 20.
~ It is desirable that the wire tension not be so ; high as to make it difficult for the preliminarily thickened suspension to enter the space between the wire and the ~, .; . .
~` ~ 32~2~-~
, -6-surface of roll 20. Thus if the wire tension is comparatively low, e. g. 1-40 lbs. per linear inch (0.15 to 5.9 Kg/cm), the pulp which has been subjected to initial dewatering as it approaches the small end of the wedge zone 44 will be more readily trapped between the wire and the roll 20 than if the wire is very tight.
The wire 30 serves as a filter that holds and carries the fiber on its inner surface against the action of centrifugal force, which is the major factor causing ' 10 dewatering of the retained pulp at wire speeds of 640-914 ; meters per minute using rolls 20 and 22 which are 24 inches in diameter. The white water expressed through the wire is thrown into a trough 60 which extends under both rolls 20 and 22 and is provided with a drain outlet 61. A two-piece hood 62 is mounted on the frame above the apparatus as a whole, and it fits into the top of the trough 60 so that any water 7, hitting the inner surface of this hood will drip therefrom into the trough.
r~l It is important, particularly in view of the high wire speeds contemplated by the invention, and due to the forces against the wire, that the wire 30 be guided such that it travels along a course perpendicular to the axes of these two rolls. This guiding action is achieved by means of a pair of V-belts 70 adjacent opposite side edges of the inside surface of the wire 30.
;~ While these belts could fit into grooves in the ' surfaces of rolls 20 and 22, as disclosed in U. S. Patent No.
4,722,793, preferred results have been obtained with the wire sufficiently wider than the axial dimensions of rolls 20 and 22 to locate these belts in overhanging relation with the ~3 ., "~' . : ' ~`
2 ~ 2 ~ ~
' , . .
':i j ends of the faces of rolls 20 and 22, as shown in Fig. 3, so -~ that each of these roll ends acts as a shoulder 72 which will -, engage the inner side surface of the adjacent belt 70 if the wire should drift to one side or the other.
; 5 In the development of the apparatus shown in Fig.
`~ 1, it was discovered that a combination of gluing and ~ stitching would secure the belts to the wire and successfully q withstand the stresses applied in test operations. This connection would last as long as the useful life of the endless wire itself. Good results have been obtained using a ~; belt of the V-belt shape as shown in Fig. 3, formed of polyvinyl chloride, with a radial dimension of 1.59 cm and a thickness ranging from 2~22 cm to 1.71 cm.
It is important that the stitching 75 comprise a thread or line of sufficient strength, and particularly toughness, to withstand the repeated bending and flexing of the belt 70 as they travel around the rolls 20 and 22, and the thread must also be highly water resistant. From these standpoints, satisfactory results have been obtained using woven or monofilament 50 lb. (23 Kg) test fishing line, but other types of thread or wire of comparable mechanical attributes could be used, as well as other for~s of mechanical conventions, such as rivets.
In addition to the stitching 75, it has been found desirable to provide a glued connection between each belt 70 and the wire 30. More specifically, before attaching a belt to the wire, the outer edge portion of the wire is ~; impregnated with urethane adhesive over a band approximately 3.8 cm wide which extends to and includes the outer edge of ~i 30 the wire, as indicated at 77 in Fig. 3.
i F
r~ . -:. , .
. ~ . .
;;~ , ~ ', .
` ~32~2~1 After this adhesive material has dried, the wide edge of the belt 70 is glued thereto, preferably with an adhesive which will chemically bond the belt with the adhesive, impregnated strip of the wire. Adhesives found satisfactory for this purpose are those sold under the trade name "PU Adhesive" by Sigling America, Inc., Englewood, ~, N.J., U.S.A., and under the trade name Rema S.C.-2000" by 1 Rema Division of Remaco, Northvale, N.J., U.S.A., in each i case using the hardener recommended by the manufacturer with the adhesive. The joint is then completed by stitching the belt to the wire, as by means of a sewing machine such as is used in shoe-making operations.
`~ The wire 30 is sufficiently wider than the axial length of the faces of rolls 20 and 22 to provide overhanging marginal portions of the wire at both ends of the rolls which will carry the belts 70. With a belt of the cross sectional ~` dimensions noted above, satisfactory results have been obtained with the wire 7.50 cm wider than the length of each of the rolls, and with a strip of wire 0.634 cm wide extending beyond each belt, thereby providing a total clearance of 1.3 cm for each of the rolls between the pair of belts 70. Thus so long as the wire runs in a straight line, there may be no contact between either roll and either of the belts 70, but if the belt should wander slightly to one side or the other, engagement between the end of a roll and the inclined adjacent surface of one of the belts 70 will result in a camming action causing the belt to return to substantially centered relation with both rolls.
The strips of adhesive 77 extending to the outer edges of the wire strengthen and protect these portions of 132~2~
g ,j.~.
i .
~- the wlre from fraying in use and contribute to the useful ` life of each wire.
~ Figs. 4-12 illustrate modified constructions which r', embody the invention as described above~ Thus in Fig. 4, a "~ 5 strip 80 of reinforcing material, which may be of the same ;~ elastomeric material as the belt 70 but somewhat greater ~` width, is positioned on the opposite side of the wire 30 from the belt 70. The stitching 81 traverses both the belt 70 and , the reinforcing strip 80 to secure these two elements together through the wire. The junction between these parts may also be reinforced by impregnating the portion of the ~j wire underlying the strip 80 with glue, as indicated at 77.
., .
The construction shown in Fig. 5 is similar to that in Fig. 4 except that the guide belt 85 includes a V-belt ,,~f~15 section 86 and marginal flanges 87 which cooperate with the wider portion of the V-section 86 to provide an increased area of contact with the wire 30. In addition, a strip 80 of reinforcing material of the same width as the maximum width of belt 85 i8 positioned on the opposite side of the wire 30 as in Fig. 4. The stitching 88 traverses both the V-section 86 of belt 85 and its side flanges portions as well as the reinforcing strip 80 and the wire. As in Fig. 4, it is desirable to reinforce the interconnection between these parts by impregnating the portion of the wire between the strip 80 and belt 85 with glue.
Fig. 6 shows the application of the invention to a ~, wire 30 which may be used with either side outermost. A
second belt 90 of the same cross sectional configuration as the belt 85 is placed on the other side of the wire from the ~ 30 belt 85, and the two belts are fastened to each other and the .
`.7 ,~j . - .
,. .
.',.............................. . .
1 32~2~
.
;
wire by stitching 92 which traverses all three elements as shown. The intero~ection between the tw~ be1ts may also be s reinforced by impregnating the portion of wire therebetween with glue.
; 5 Fig. 7 illustrates a ~odification of the invention ;, wherein guide belts 85 and 90 are provided on both sides of the wire but in offset relation, and with the connection between each of these belts and the wire provided with a . reinforcing strip 80 as described in connection with Figs. 4 and 5. Fig. 7 also illustrates both of belts 85 and 90 as provided with multiple V-shaped s1its 9S for relieving the tension and compression forces during use. With belts on both sides of the wire loop, the peripheral dimension of the 3, belt on the outside of the wire will be greater than that of the inside belt, but this relationship will be reversed when the wire is turned inside out. The slits 95 cooperate with the elastomeric properties of the belts to compensate for these dimensional differences, and similar slits should be provided in the belts 85 and 9~ in Fig. 6.
Fig. 8 shows a form of the invention wherein the guiding V-belt 100 includes a flange portion 101 on only one , side thereof, and the belt is secured to the wire 30 by superimposing the flange 101 on a marginal strip of the wire 30 and securing these overlying layer~ together by stitching 102, preferably reinforced by glue impregnating the portion of the wire in contact with belt flange 101. It will be understood that this construction is duplicated at the other side of the wire.
~ In Fig. 9, the wire 30 is provided at each side s~ 30 with a guide belt 110 formed by rolling a marginal strip of .~, ";~
~f ,: , ~ ' ` ", .
.
' : - :' . :
~32~
. ~
, wire on itself into the form of a V-belt. This rolled portion of the wire is secured together by ~eans of stitching s 111, and its for~ation may also be aided by a center core, preferably of elastomeric material and V-shape in section.
S Fig. 10 shows a form of the invention similar to that in Fig. 9 except that the core 115 is a V-belt, and it is secured to the edge of the wire 30 by wrapping it in a marginal strip of the wire, with the resulting assembly secured together and to the wire by stitching 116.
Figs. 11 and 12 show two other forms of guiding belt which may be secured along each edge of the wire 30. In `J Fig. 11, the guiding belt 120 is of right angled form, and it is secured to the edge of the wire by folding a marginal strip of wire around it and by stitching 121 as shown.
Preferably the overlying strip of wire will be impregnated with glue at the time of assembly. The guide belt 125 in Fig. 12 is of rectangular section and is similarly partially ?~ enclosed by a strip of wire 30 to which it is secured by stitching 126, with the aid of adhesive impregnating that portion of the wire which is contact with belt 125.
:
~ ' ' , ~`
j : :
., ~- : :
Claims (16)
1. A foraminous endless wire for use as the stock supporting and conveying component in a high speed stock thickener for the papermaking industry in which said wire is trained over spaced-apart rolls and carries stock to be thickened along its inside surface over said rolls, and in which said rolls are provided with shoulders at their respective ends, for guiding said wire, comprising:
said wire having a width which exceeds the axial length of said rolls providing a marginal edge which extends beyond said roll shoulders, a pair of guide belts, one each positioned at each marginal side of said wire and positioned to run with the wire immediately adjacent said roll shoulders, each said belt having a back forming a mounting surface, a side wall for engagement with the shoulder of the adjacent roll end, and a bottom, first fastening means attaching said belts at the backs thereof to said wire at said wire marginal edges, including an adhesive bond between said backs and the adjacent wire surfaces including a bonding glue penetrating the wire openings forming bonds between the wire and the belts, and second fastening means joining said belts to said wire marginal edges including a continuous thread sewn through each said belt from said bottom through the back thereof and into said wire, said thread extending the length of the belt.
said wire having a width which exceeds the axial length of said rolls providing a marginal edge which extends beyond said roll shoulders, a pair of guide belts, one each positioned at each marginal side of said wire and positioned to run with the wire immediately adjacent said roll shoulders, each said belt having a back forming a mounting surface, a side wall for engagement with the shoulder of the adjacent roll end, and a bottom, first fastening means attaching said belts at the backs thereof to said wire at said wire marginal edges, including an adhesive bond between said backs and the adjacent wire surfaces including a bonding glue penetrating the wire openings forming bonds between the wire and the belts, and second fastening means joining said belts to said wire marginal edges including a continuous thread sewn through each said belt from said bottom through the back thereof and into said wire, said thread extending the length of the belt.
2. A foraminous wire as defined in claim 1 wherein each of said belts is spaced inwardly from the adjacent edge of said wire by a relatively small distance to provide a correspondingly small edge portion of said wire extending outwardly of said belt, and further comprising each of said adhesive glue bonds also extending into and impregnating the adjacent said outer edge portion of said belt to protect the same against fraying in use.
3. A foraminous wire as defined in claim 1 further comprising a strip of reinforcing material on the opposite surface of said wire from said belt, said fastening means forming a direct connection between said belt and said reinforcing strip.
4. A foraminous wire as defined in claim 3 wherein said fastening means comprises stitching transversing said belt, said wire and said strip of reinforcing material to secure all three said elements mechanically together.
5. A foraminous wire as defined in claim 1 further characterized in that each of said belts has an outer side and is enclosed along at least said outer side thereof by a marginal strip of said wire, and said belts and said enclosing strips of wire are secured together by stitching.
6. In a high speed type stock thickener for papermaker's paper stock in which an open mesh endless wire is trained over at least two rolls, and paper stock is applied between the wire and the rolls and is carried on an inside surface of the wire for dewatering at the regions where the stock is carried between the wire and a roll, an in which said rolls are formed with a roll shoulder for coaction with a guide belt in the wire, the combination of means for maintaining the wire in guided relation on the rolls comprising:
a guide belt on said wire positioned to run adjacent said roll shoulder, said belt having a back forming a mounting surface, a side wall for engagement with said roll shoulder, and a bottom, first fastening means attaching said belt at the back thereof to said wire, including an adhesive bond between said back and the adjacent wire surface, said adhesive bond including glue which penetrates the open wire mesh and forms a bond between the belt and the wire, and second fastening means joining said belt to said wire including a continuous thread sewn through said belt from said bottom through the back thereof and into said wire, said thread extending the length of the belt.
a guide belt on said wire positioned to run adjacent said roll shoulder, said belt having a back forming a mounting surface, a side wall for engagement with said roll shoulder, and a bottom, first fastening means attaching said belt at the back thereof to said wire, including an adhesive bond between said back and the adjacent wire surface, said adhesive bond including glue which penetrates the open wire mesh and forms a bond between the belt and the wire, and second fastening means joining said belt to said wire including a continuous thread sewn through said belt from said bottom through the back thereof and into said wire, said thread extending the length of the belt.
7. The combination of claim 6 in which said belt is in the shape of a V-belt and is formed of polyvinyl chloride material.
8. The combination of claim 7 in which said thread is monofilament fishing line material.
9. The combination of claim 6 further comprising reinforcing flexible backing strip means positioned on the opposite surface of said wire from said belt, said first and second fastening means joining said backing strip means to said wire as a unit with said belt.
10. The combination of claim 6 in which said wire has a width greater than the axial length of said rolls so that marginal edges of said wire extend beyond the roll ends and said rolls are formed with said guide shoulders at the ends thereof, and further comprising a pair of said belts, one each attached to one of the marginal edges of said wire for coaction with the adjacent said roll shoulder.
11. The wire of claim 1 further comprising reinforcing flexible backing strip means, one each positioned on the opposite surface of said wire from each said belt, said first and second fastening means joining said backing strip means to said wire as a unit with the associated said belt.
12. The wire of claim 11 in which said backing strip means each comprise another said belt inverted with respect to the associated guide belt providing for the mounting and guiding of said wire on said rolls with either surface thereof outermost.
13. A formanious wire as defined in claim 12 wherein each of said belts is provided with multiple slits extending partial therethrough from the edge thereof remote from said wire to compensate for the tension and compression forces thereon during the use of said wire.
14. An open mesh endless wire for use as the stock supporting and conveying component in a high speed stock thickener for the papermaking industry in which said wire is trained over spaced-apart rolls and carries stock to be thickened along its inside surface over said rolls, and in which said guide rolls are provided with shoulders for co-acting with a belt on said wire, comprising:
a guide belt positioned on said wire to run adjacent said roll shoulders, said belt having a back forming a mounting surface and a side wall for engagement with said roll shoulders, first fastening means attached said belt at the back thereof to said wire including an adhesive between said back and the adjacent wire surface, including bonding glue penetrating the open wire mesh and forming a bond between the belt and the wire, and second fastening means joining said belt to said wire including a continuous thread sewn through said belt back and into said wire, said thread extending the length of the belt.
a guide belt positioned on said wire to run adjacent said roll shoulders, said belt having a back forming a mounting surface and a side wall for engagement with said roll shoulders, first fastening means attached said belt at the back thereof to said wire including an adhesive between said back and the adjacent wire surface, including bonding glue penetrating the open wire mesh and forming a bond between the belt and the wire, and second fastening means joining said belt to said wire including a continuous thread sewn through said belt back and into said wire, said thread extending the length of the belt.
15. In a high speed stock thickener for papermaker's paper stock in which an open mesh endless wire is trained over at least two rolls, in which said rolls have a predetermined length between their axial ends and in which said wire is of a width greater than said predetermined length to provide marginal edges which extend beyond said roll axial ends, including means for applying such paper stock between said wire and said rolls so that said paper stock is carried on an inside surface of said wire for dewatering at the regions where said stock is carried between said wire and a roll, and in which said rolls are formed with roll shoulders at each of their said axial ends defining end faces for coaction with a guide belt on said wire, the combination of means for maintaining said wire in guided relation on said rolls comprising:
a pair of V-shaped guide belts, one each attached to one of said wire marginal edges, each of said belts having a back forming a mounting surface, a side wall positioned in immediate adjacent relation to one of said end faces of said rolls for engagement with said adjacent said face, and a bottom, first fastening means attaching each said belt at the back thereof to said wire, including an adhesive bond between said back and the adjacent wire surface, said adhesive bond including glue which penetrates the open wire mesh and forms a bond between the belt and the wire, and second fastening means joining each said belt to said wire including a continuous thread sewn through said belt from said bottom through the back thereof and into said wire, said thread extending the length of the belt.
a pair of V-shaped guide belts, one each attached to one of said wire marginal edges, each of said belts having a back forming a mounting surface, a side wall positioned in immediate adjacent relation to one of said end faces of said rolls for engagement with said adjacent said face, and a bottom, first fastening means attaching each said belt at the back thereof to said wire, including an adhesive bond between said back and the adjacent wire surface, said adhesive bond including glue which penetrates the open wire mesh and forms a bond between the belt and the wire, and second fastening means joining each said belt to said wire including a continuous thread sewn through said belt from said bottom through the back thereof and into said wire, said thread extending the length of the belt.
16. An open mesh endless wire for use in a high speed stock thickener for papermaker's paper stock in which said endless wire is trained over at least two rolls that have a predetermined length between their axial ends and which includes means for applying such paper stock between said wire and said rolls so that said paper stock is carried on an inside surface of said wire for dewatering at the regions where said stock is carried between said wire and a roll, and in which said rolls are formed with roll shoulders at each of their said axial ends defining end faces, said wire being of a width greater than said predetermined roll length to provide marginal edges which extend beyond said roll axial ends, said wire including means for maintaining said wire in guided relation on said rolls comprising:
a V-shaped guide belt attached to each of said wire marginal edges, each of said belts having a back forming a mounting surface, a side wall positioned in immediate adjacent relation to one of said end faces of said rolls for engagement with said adjacent said face, and a bottom, first fastening means attaching each said belt at the back thereof to said wire, including an adhesive bond between said back and the adjacent wire surface, said adhesive bond including glue which penetrates the open wire mesh and forms a bond between the belt and the wire, and second fastening means joining each said belt to said wire including a continuous thread sewn through said belt from said bottom through the back thereof and into said wire, said thread extending the length of the belt.
a V-shaped guide belt attached to each of said wire marginal edges, each of said belts having a back forming a mounting surface, a side wall positioned in immediate adjacent relation to one of said end faces of said rolls for engagement with said adjacent said face, and a bottom, first fastening means attaching each said belt at the back thereof to said wire, including an adhesive bond between said back and the adjacent wire surface, said adhesive bond including glue which penetrates the open wire mesh and forms a bond between the belt and the wire, and second fastening means joining each said belt to said wire including a continuous thread sewn through said belt from said bottom through the back thereof and into said wire, said thread extending the length of the belt.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US19302688A | 1988-05-12 | 1988-05-12 | |
| US193,026 | 1988-05-12 | ||
| US22939388A | 1988-08-08 | 1988-08-08 | |
| US229,393 | 1988-08-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1324281C true CA1324281C (en) | 1993-11-16 |
Family
ID=26888605
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000597111A Expired - Fee Related CA1324281C (en) | 1988-05-12 | 1989-04-19 | Endless wire for pulp thickener |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0341913B1 (en) |
| JP (1) | JP2667903B2 (en) |
| CA (1) | CA1324281C (en) |
| DE (2) | DE341913T1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0671979U (en) * | 1993-03-19 | 1994-10-07 | 株式会社フジキン | Fluid controller for semiconductor manufacturing equipment |
| US7862879B2 (en) * | 2003-07-31 | 2011-01-04 | Albany International Corp. | Fabrics with v-guides |
| EP1728918A3 (en) | 2005-05-12 | 2006-12-13 | Voith Patent GmbH | Proces for removing impurities from an aqueous fibrous suspension |
| JP4768424B2 (en) | 2005-12-07 | 2011-09-07 | 日本フイルコン株式会社 | Belt for dehydration and concentration with improved guide performance and method for producing the same |
| DE102008009134A1 (en) | 2008-02-14 | 2009-08-20 | Voith Patent Gmbh | Removing impurities from aqueous fibrous material suspension formed from printed waste paper, comprises forming fine fraction and rough fraction from the material suspension by fractionating, and treating the fine fraction in a floatation |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB398980A (en) * | 1931-12-03 | 1933-09-28 | Carl Busch Thorne | Apparatus for separating and recovering solid matter from liquid suspension |
| US3327839A (en) * | 1965-07-08 | 1967-06-27 | Ajem Lab Inc | Conveyor apparatus |
| FR2572303A1 (en) * | 1984-10-25 | 1986-05-02 | Goavec Sa | Filtration device with a band filter intended for the fine filtration of sensitive liquids |
| DE3514469A1 (en) * | 1985-04-22 | 1986-10-23 | Arnold 3167 Burgdorf Jäger | Rotating band for agricultural sorting appliances |
| US4722793A (en) * | 1986-07-03 | 1988-02-02 | The Black Clawson Company | Apparatus and method for thickening pulp and paper stock |
-
1989
- 1989-04-19 CA CA000597111A patent/CA1324281C/en not_active Expired - Fee Related
- 1989-05-05 DE DE1989304535 patent/DE341913T1/en active Pending
- 1989-05-05 DE DE1989620197 patent/DE68920197T2/en not_active Expired - Fee Related
- 1989-05-05 EP EP19890304535 patent/EP0341913B1/en not_active Expired - Lifetime
- 1989-05-12 JP JP1120203A patent/JP2667903B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| DE341913T1 (en) | 1991-05-23 |
| JP2667903B2 (en) | 1997-10-27 |
| JPH0214090A (en) | 1990-01-18 |
| EP0341913A2 (en) | 1989-11-15 |
| EP0341913A3 (en) | 1991-07-03 |
| DE68920197D1 (en) | 1995-02-09 |
| DE68920197T2 (en) | 1995-05-11 |
| EP0341913B1 (en) | 1994-12-28 |
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| MKLA | Lapsed |