CA2050647A1 - Auto-slice, especially for a twin wire former - Google Patents
Auto-slice, especially for a twin wire formerInfo
- Publication number
- CA2050647A1 CA2050647A1 CA002050647A CA2050647A CA2050647A1 CA 2050647 A1 CA2050647 A1 CA 2050647A1 CA 002050647 A CA002050647 A CA 002050647A CA 2050647 A CA2050647 A CA 2050647A CA 2050647 A1 CA2050647 A1 CA 2050647A1
- Authority
- CA
- Canada
- Prior art keywords
- slotted
- wire
- former
- dewatering
- twin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 239000000725 suspension Substances 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 210000000481 breast Anatomy 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 4
- 239000012530 fluid Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 claims description 2
- 239000013013 elastic material Substances 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 238000011144 upstream manufacturing Methods 0.000 claims description 2
- 238000010276 construction Methods 0.000 description 10
- 230000015572 biosynthetic process Effects 0.000 description 5
- 239000011111 cardboard Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000011087 paperboard Substances 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 229940090441 infed Drugs 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000000123 paper 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
- D21F1/48—Suction apparatus
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F9/00—Complete machines for making continuous webs of paper
- D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type
Landscapes
- Paper (AREA)
- Sheet Holders (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Infusion, Injection, And Reservoir Apparatuses (AREA)
- Nozzles (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
Each slotted dewatering device is provided, as viewed in the direction of travel of the associated twin wire former, with a rear wall having two horizontally extending wall parts, that is, two wall parts defining upper and lower wall parts which extend in the cross-machine direction. The upper wall part is stationary during operation of the slotted dewatering device, and the lower wall part confronting the upper wire of the twin wire former, is constructed and arranged as a diaphragm which partially overlaps and can be moved relative to the upper wall part. This lower wall part is adjustable displaceable towards and away from the upper wire of the twin wire former. In each momentarily adjusted position of the lower wall part the latter is elastically supported in the direction of the upper wire at the stationary upper wall part. A positioning motor arranged between the upper and lower wall parts serves to displace and elastically support the lower wall part. A plurality of these slotted dewatering devices can be provided at the dewatering section of the twin wire former of a papermaking machine.
Each slotted dewatering device is provided, as viewed in the direction of travel of the associated twin wire former, with a rear wall having two horizontally extending wall parts, that is, two wall parts defining upper and lower wall parts which extend in the cross-machine direction. The upper wall part is stationary during operation of the slotted dewatering device, and the lower wall part confronting the upper wire of the twin wire former, is constructed and arranged as a diaphragm which partially overlaps and can be moved relative to the upper wall part. This lower wall part is adjustable displaceable towards and away from the upper wire of the twin wire former. In each momentarily adjusted position of the lower wall part the latter is elastically supported in the direction of the upper wire at the stationary upper wall part. A positioning motor arranged between the upper and lower wall parts serves to displace and elastically support the lower wall part. A plurality of these slotted dewatering devices can be provided at the dewatering section of the twin wire former of a papermaking machine.
Description
AUTO-SLICE, ESPECIALLY FOR A TWIN WIRE FORNER
BACKGROUND OF THE INVENTION
1. Fleld of the Invention The present invention relates to a new and improved construction of slotted dewatering device or dewatering device equipped with a slotted nozzle, also referred to in the papermaking art as an auto-slice, for a twin wire former of a papermaking machine. The present invention further pertains to a twin wire former of a papermaking machine with which there is used such slotted dewatering device.
The term "papermaking" machine as used in the context of this disclosure, particularly means a machine for the fabrication of paper or cardboard, and thus, should be understood in this broader sense.
Generally speaking, the slotted dewatering device or dewatering device equipped with a slotted nozzle of the present development for a twin wire former, serves for the removal of water from the upper wire of the twin wire former, and is of the type comprising a compartment or chamber through which there flows or is guided the water to be removed. This water-guiding compartment is formed or defined between two walls extending transversely with respect to the upper wire, in other words, 20~647 these two walls extend in the cross-machine direction, over the width of the upper wire which has a predetermined direction of travel. The front wall of these two walls, as viewed with respect to the predetermined direction of travel of the upper wire, is arranged in spaced relation with respect to the upper wire, so that there is formed a gap between the lower edge of the front wall and the upper wire. The other wall, namely, the rear wall of these two walls, during operation, extends up to the region of the upper wire.
Regarding the arrangement of such slotted dewatering device at the twin wire former, there are provided a plurality of support elements having support surfaces along which there is guided the twin wire former composed of the travelling upper wire and travelling lower wire together with the stock suspension which is to be dewatered and from which there is formed a web or the like.
BACKGROUND OF THE INVENTION
1. Fleld of the Invention The present invention relates to a new and improved construction of slotted dewatering device or dewatering device equipped with a slotted nozzle, also referred to in the papermaking art as an auto-slice, for a twin wire former of a papermaking machine. The present invention further pertains to a twin wire former of a papermaking machine with which there is used such slotted dewatering device.
The term "papermaking" machine as used in the context of this disclosure, particularly means a machine for the fabrication of paper or cardboard, and thus, should be understood in this broader sense.
Generally speaking, the slotted dewatering device or dewatering device equipped with a slotted nozzle of the present development for a twin wire former, serves for the removal of water from the upper wire of the twin wire former, and is of the type comprising a compartment or chamber through which there flows or is guided the water to be removed. This water-guiding compartment is formed or defined between two walls extending transversely with respect to the upper wire, in other words, 20~647 these two walls extend in the cross-machine direction, over the width of the upper wire which has a predetermined direction of travel. The front wall of these two walls, as viewed with respect to the predetermined direction of travel of the upper wire, is arranged in spaced relation with respect to the upper wire, so that there is formed a gap between the lower edge of the front wall and the upper wire. The other wall, namely, the rear wall of these two walls, during operation, extends up to the region of the upper wire.
Regarding the arrangement of such slotted dewatering device at the twin wire former, there are provided a plurality of support elements having support surfaces along which there is guided the twin wire former composed of the travelling upper wire and travelling lower wire together with the stock suspension which is to be dewatered and from which there is formed a web or the like.
2. Discussion of the Backqround and Material Information A slotted dewatering device or dewatering device equipped with a slotted nozzle which, as noted above, also is referred to in the art as an auto-slice, is particularly used in conjunction with twin wire formers for the removal of the water of the stock suspension which is expressed through the upper wire. This stock suspension is located in the form of a stock suspension layer between the upper and lower wires where it is 205~6~7 dewatered and ~ormed into a web. While the water can be relat:ively easily removed from the lower wire in downward direc:tion by exploiting the force of gravity, that is not the case for the water which is to be removed from the upper wire, where such water removal must be accomplished against the action of the force of gravity and essentially in a vertically upward direction. By means of the kinetic energy of the water which is moving at the velocity of the upper wire, this water ascends along a wall of the slotted dewatering device placed in the path of movement of the water, and through the possible application of a vacuum such water can be scooped off or extracted from the upper wire and removed.
There are known to the art different slotted dewatering devices and their use in papermaking machines. Such are typified by the following patent literature:
In European Patent Specification No. 0,289,445, published January 16, 1991, there is disclosed an arrangement where initially a longer shoe is arranged at the lower wire. The water which collects in upward direction at the upper wire can ~0 not be directly removed from the upper wire by the subsequently arranged slotted dewatering device. Additionally, the formation of the upper side of the stock suspension is not improved by pressure pulses.
In German Patent No. 1,116,967, granted May 24, 1962, 20~6~7 there are taught water-removal guide elements and so-called beak-suction devices which upwardly extract the water, but they are not considered suitable for controlling the formation of the paper web.
According to the European Patent Specification No. 0,136,000, published January 7, 1988, there are provided primary and secondary slotted dewatering devices or auto-slices which are fixedly arranged with respect to the upper wire, with the result that the stock suspension layer which is to be formed into the web can be squeezed and damaged. Additionally, there is present a considerable spacing of the slotted dewatering devices from the upper wire, which can result in the undesirable formation of mist or the like.
In the published application PCT/FI 86/00012, published July 31, 1986, there is disclosed a twin wire former equipped with slotted dewatering devices which press into the wire. Also with this construction and mode of operation of the slotted dewatering devices at the twin wire former there exists the danger of possibly undesirably compressing the fiber layer of the stock suspension which i5 to be formed into the web.
SUMMARY OF THE INVENTION
Therefore, with the foregoing in mind it is a primary object of the present invention to provide an improved 20~06~7 construction of slotted dewatering device which is not afflicted with the aforementioned limitations and drawbacks of the prior art.
Another and more specific object of the present invention is to provide an improved construction of slotted dewatering device which reliably and cleanly upwardly removes the water at a twin wire former of a papermaking machine, enables exerting a number of pressure pulses upon the surface of the stock suspension and augments good formation of the web from the stock suspension, and wherein the adjustment or setting of the slotted dewatering device with respect to the upper wire, and specifically with regard to the position of the upper wire in the presence of different thicknesses of the stock suspension between the upper and lower wires, can be simultaneously automatically accomplished.
Still a further noteworthy object of the present invention is the provision of an improved construction of slotted dewatering device which allows for relatively easy modification of a longitudinal wire section of a papermaking machine into a twin wire section.
A further significant object of the present invention is the provision of an improved construction of slotted dewatering device which also can be advantageously used when fabricating so-called heavy paper or cardboard, such as 2 0 ~ 7 linerboard or corrugated materials and so forth.
Another important object of the present invention is the provision of a twin wire former of a papermaking machine equipped with such slotted dewatering devices, in order to obtain reliable removal of water from the upper wire of the twin wire former and enhanced formation of the web from the stock suspension.
Now in order to implement these and still further objects of the present invention, which will become more readily apparent as the description proceeds, the slotted dewatering device of the present development is manifested, among other things, by the features that the rear wall in the adjusted or sPt position thereof is elastically supported in the direction of the upper wire, and a guide surface is provided at the side of the twin wire former which is located opposite to the slotted dewatering device.
According to the invention, this guide surface is constructed to define an elastic guide surface.
Furthermore, it is possible to provide a regulator for regulating the position of the wire or wires between the elastic slotted dewatering device and the elastic guide surface.
It is also contemplated by the present invention that 2~0~47 the rear wall comprises two parts arranged in essentially superimposed relationship and movable relative to one another.
One of the parts, defining the upper part, is stationary in the operating position of the slotted dewatering device, and the other part, defining a lower part which confronts the upper wire of the twin wire former comprises a diaphragm which is displaceable along the upper part and partially overlaps such upper part. This lower part is adjustably displaceable towards and away from the upper wire. For this purpose, there is provided an adjustment or positioning motor for the displacement and elastic support of the lower part of the rear wall.
This adjustment or positioning motor advantageously comprises two pressure chambers or compartments which are sealingly lined with hoses or tubes or the like formed of an elastic material, and a pressurized fluid medium can be infed to each of the hoses or tubes.
As a further feature of the lower part of the rear wall, such has an edge facing towards the upper wire of the twin wire former. This edge of the lower part is provided with a layer or covering formed of a suitable wear-resistant material.
It is advantageous to mount a plurality of the slotted dewatering devices in a structural unit or mounting member, so that such slotted dewatering devices can be collectively positionally adjusted in the direction of the upper wire of the twin wire former.
As previously mentioned, the present invention also is concerned with the combination of a twin wire former of a papermaking machine equipped with such slotted dewatering devices. In particular, there is provided a plurality of slotted dewatering devices arranged at the start or starting portion of a wire section of a forming section of the twin wire former, each of these slotted dewatering devices is arranged to contact the upper wire of the twin wire former. Each slotted dewatering device is arranged at a wire section between two neighboring support elements, or, more specifically, as viewed with respect to the direction of travel of the twin wire former, downstream of an associated support element. The wire section provided with the slotted dewatering devices is followed by a wire section provided with a press device, and specifically, a press shoe and a plurality of further support elements disposed at the lower wire at the region of the press shoe.
This combination of the twin wire former and slotted dewatering devices is further manifested by the features that, as an alternative to the foregoing, there is first arranged at a wire section of the upper wire, as viewed in the direction of travel of the twin wire former, the press shoe, and then such wire section is followed by a further wire section which is provided with a plurality of the slotted dewatering devices.
There are known to the art different slotted dewatering devices and their use in papermaking machines. Such are typified by the following patent literature:
In European Patent Specification No. 0,289,445, published January 16, 1991, there is disclosed an arrangement where initially a longer shoe is arranged at the lower wire. The water which collects in upward direction at the upper wire can ~0 not be directly removed from the upper wire by the subsequently arranged slotted dewatering device. Additionally, the formation of the upper side of the stock suspension is not improved by pressure pulses.
In German Patent No. 1,116,967, granted May 24, 1962, 20~6~7 there are taught water-removal guide elements and so-called beak-suction devices which upwardly extract the water, but they are not considered suitable for controlling the formation of the paper web.
According to the European Patent Specification No. 0,136,000, published January 7, 1988, there are provided primary and secondary slotted dewatering devices or auto-slices which are fixedly arranged with respect to the upper wire, with the result that the stock suspension layer which is to be formed into the web can be squeezed and damaged. Additionally, there is present a considerable spacing of the slotted dewatering devices from the upper wire, which can result in the undesirable formation of mist or the like.
In the published application PCT/FI 86/00012, published July 31, 1986, there is disclosed a twin wire former equipped with slotted dewatering devices which press into the wire. Also with this construction and mode of operation of the slotted dewatering devices at the twin wire former there exists the danger of possibly undesirably compressing the fiber layer of the stock suspension which i5 to be formed into the web.
SUMMARY OF THE INVENTION
Therefore, with the foregoing in mind it is a primary object of the present invention to provide an improved 20~06~7 construction of slotted dewatering device which is not afflicted with the aforementioned limitations and drawbacks of the prior art.
Another and more specific object of the present invention is to provide an improved construction of slotted dewatering device which reliably and cleanly upwardly removes the water at a twin wire former of a papermaking machine, enables exerting a number of pressure pulses upon the surface of the stock suspension and augments good formation of the web from the stock suspension, and wherein the adjustment or setting of the slotted dewatering device with respect to the upper wire, and specifically with regard to the position of the upper wire in the presence of different thicknesses of the stock suspension between the upper and lower wires, can be simultaneously automatically accomplished.
Still a further noteworthy object of the present invention is the provision of an improved construction of slotted dewatering device which allows for relatively easy modification of a longitudinal wire section of a papermaking machine into a twin wire section.
A further significant object of the present invention is the provision of an improved construction of slotted dewatering device which also can be advantageously used when fabricating so-called heavy paper or cardboard, such as 2 0 ~ 7 linerboard or corrugated materials and so forth.
Another important object of the present invention is the provision of a twin wire former of a papermaking machine equipped with such slotted dewatering devices, in order to obtain reliable removal of water from the upper wire of the twin wire former and enhanced formation of the web from the stock suspension.
Now in order to implement these and still further objects of the present invention, which will become more readily apparent as the description proceeds, the slotted dewatering device of the present development is manifested, among other things, by the features that the rear wall in the adjusted or sPt position thereof is elastically supported in the direction of the upper wire, and a guide surface is provided at the side of the twin wire former which is located opposite to the slotted dewatering device.
According to the invention, this guide surface is constructed to define an elastic guide surface.
Furthermore, it is possible to provide a regulator for regulating the position of the wire or wires between the elastic slotted dewatering device and the elastic guide surface.
It is also contemplated by the present invention that 2~0~47 the rear wall comprises two parts arranged in essentially superimposed relationship and movable relative to one another.
One of the parts, defining the upper part, is stationary in the operating position of the slotted dewatering device, and the other part, defining a lower part which confronts the upper wire of the twin wire former comprises a diaphragm which is displaceable along the upper part and partially overlaps such upper part. This lower part is adjustably displaceable towards and away from the upper wire. For this purpose, there is provided an adjustment or positioning motor for the displacement and elastic support of the lower part of the rear wall.
This adjustment or positioning motor advantageously comprises two pressure chambers or compartments which are sealingly lined with hoses or tubes or the like formed of an elastic material, and a pressurized fluid medium can be infed to each of the hoses or tubes.
As a further feature of the lower part of the rear wall, such has an edge facing towards the upper wire of the twin wire former. This edge of the lower part is provided with a layer or covering formed of a suitable wear-resistant material.
It is advantageous to mount a plurality of the slotted dewatering devices in a structural unit or mounting member, so that such slotted dewatering devices can be collectively positionally adjusted in the direction of the upper wire of the twin wire former.
As previously mentioned, the present invention also is concerned with the combination of a twin wire former of a papermaking machine equipped with such slotted dewatering devices. In particular, there is provided a plurality of slotted dewatering devices arranged at the start or starting portion of a wire section of a forming section of the twin wire former, each of these slotted dewatering devices is arranged to contact the upper wire of the twin wire former. Each slotted dewatering device is arranged at a wire section between two neighboring support elements, or, more specifically, as viewed with respect to the direction of travel of the twin wire former, downstream of an associated support element. The wire section provided with the slotted dewatering devices is followed by a wire section provided with a press device, and specifically, a press shoe and a plurality of further support elements disposed at the lower wire at the region of the press shoe.
This combination of the twin wire former and slotted dewatering devices is further manifested by the features that, as an alternative to the foregoing, there is first arranged at a wire section of the upper wire, as viewed in the direction of travel of the twin wire former, the press shoe, and then such wire section is followed by a further wire section which is provided with a plurality of the slotted dewatering devices.
20~0~7 Furthermore, as to a further aspect of the present invention, a pair of superimposed breast rolls are arranged upstream of the wire section provided with the slotted dewatering devices. The upper roll of such superimposed breast rolls comprises a solid roll and the lower roll comprises an open or perforated roll which removes water.
Here too, it is advantageous to mount a plurality of the slotted dewatering devices in a ~tructural unit or mounting member, so that such slotted dewatering devices can be collectively positionally adjusted in the direction of the upper wire of the twin wire former.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be better understood and objects other than those set forth above, will become apparent when consideration is given to the following detailed description thereof. Such description makes reference to the annexed drawings wherein:
Fig. 1 is an enlarged view, partially in section, of a slotted dewatering device constructed according to the present invention;
Fig. 2 schematically illustrates a twin wire former of a papermaking machine which is equipped with slotted dewatering devices constructed according to the present invention; and 20~06~7 Fig. 3 schematically illustrates in fragmentary view a modified construction of a twin wire former of a papermaking machine which is equipped with such slotted dewatering devices and a modified arrangement of the headbox.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Describing now the drawings, it is to be understood that only enough of the construction of the papermaking machine including the slotted dewatering devices have been depicted therein, in order to simplify the illustration, as needed for those skilled in the art to readily understand the underlying principles and concepts of the present invention.
Turning attention initially to Fig. 1, there is depicted therein on an enlarged scale an exemplary embodiment of slotted dewatering device 1, in other words, a dewatering device equipped with a slotted nozzle structure, and as stated, also sometimes referred to in the papermaking art as an auto-slice.
This slotted dewatering device 1 can be particularly advantageously used in conjunction with a twin wire former 2 of a papermaking machine, generally indicated by reference numeral 30 in Fig. 3. Such slotted dewatering device 1 is primarily used for the removal of water of the stock suspension from the upper wire 3 of the twin wire former 2.
Each such slotted dewatering device 1 comprises a 20~0647 water-guiding or water-removal compartment or chamber 4 which is formed between two walls or wall members 5 and 6 which extend in the cross-machine direction, namely, transversely with respect to the upper wire 3 of the twin wire former 2 over the entire width of such upper wire 3. The wall 5 defines a front wall with respect to a predetermined direction of travel, generally indicated by the arrow 32, of the twin wire former 2. This front wall 5 is shorter in length, as viewed in the direction of the confronting upper wire 3 of the twin wire former 2, than the other wall 6 which defines a rear wall with respect to the predetermined direction of travel 32 of the twin wire former 2.
During operation of the slotted dewatering device 1, this rear wall 6 of the water-guiding compartment or chamber 4 extends up to the upper wire 3 of the twin wire former 2. Between the lower edge 5a of the shorter rear wall 5 and the upper wire 3 there is formed a gap or slot 7.
Continuing, it will be observed that the rear wall 6 comprises two essentially horizontally extending parts or portions 8 and 9, in other words, these parts 8 and 9 extend in the cross-machine direction of the papermaking machine 30. The wall part 8 defines an upper part which, during operation of the slotted dewatering device 1, is stationary, and the other part 9 which defines a lower part and confronts the upper wire 3, is constructed and arranged as a diaphragm which partially overlaps and is displaceable along the stationary upper part 8. As will be more fully explained shortly, this lower part 9 is adjustably 20~06~7 displaceable towards and away from the upper wire 3 of the twin wire :former 2. In each momentarily adjusted position of the lower part 9 with respect to the upper wire 3 such lower part g is elastically supported at the upper part 8 of the related slotted dewatering device 1.
A suitable drive, here shown as an adjustment or positioning motor 10 arranged between the upper part 8 and the lower part 9 serves to displace and elastically support this lower part 9 of the slotted dewatering device 1. In the exemplary construction under consideration, this adjustment or positioning motor 10 possesses two pressure chambers or compartments 22 and 23. The pressure chamber or compartment 22 defines an upper pressure chamber or compartment which is responsible for the upward movement of the lower part 9 with respect to the upper wire 3. The other pressure chamber or compartment 23 defines a lower pressure chamber or compartment which is responsible for the downward movement of the lower part 9 with respect to the upper wire 3.
These pressure chambers or compartments 22 and 23 are each lined by sealed, elastic hoses or tubes 22a and 23a, respectively, having suitable infeed or delivery means or ports 34 for the delivery of an appropriate pressurized fluid medium, such as compressed air, by way of example. This pressure is elastically supported, so that the lower edge or marginal portion 25 of the lower part 9 which confronts the upper wire 3 and which is provided with a wear-resistant layer or covering 24, can follow any changes in position of the upper wire 3 of the twin wire former 2. It should be appreciated the spatial position of the upper wire 3 can change during operation of the papermaking machine 30 by virtue of fluctuations in the thickness of the stock suspension layer or web which is disposed between the upper wire 3 and the lower wire 18 (see Fig. 2) of the twin wire former 2. This accommodation of the position of the upper wire 3 occurs automatically during operation of the papermaking machine 30.
During operation of the slotted dewatering device 1 and the papermaking machine 30, the water ascends upwardly through the water-guiding or water-removal compartment or chamber 4 and flows into a collecting chamber or compartment 26 through which it emerges by means of an outflow or discharge opening 27.
Depending upon the available space, this collecting chamber or compartment 26 can be arranged forwardly or rearwardly of the water-guiding or water-removal compartment or chamber 4.
With reference now to the exemplary embodiment of twin wire former 2 of the papermaking machine 30 shown in Fig. 2, it will be seen that there are provided a spaced sequence of such slotted dewatering devices 1 arranged downstream of a headbox 28 with respect to the predetermined direction of movement 32 of the twin wire former 2. Furthermore, it will be seen that the twin wire former 2 comprises a plurality of sequentially spaced support elements 11, 12, 13 and 14, 15, 16 and 17 defining 2~0647 support surfaces and arranged at the region of the lower wire 18 downstream of the headbox 28~ These support elements 11, 12, 13 and 14, 15, 16 and 17 are of conventional cons~ruction and serve both to downwardly remove water from the twin wire former 2 and to apply pressure pulses to the lower side of the stock suspension layer or web which is to be formed and which is sandwiched between the upper wire 3 and the lower wire 18 of this twin wire former 2. These upper and lower wires 3 and 18 travel along the supporting or support plane generally indicated by reference numeral 36 in Fig. 2.
Reverting further to such Fig. 2, it will be seen that in the direction of travel 32 of the upper wire 3 and the lower wire 18, there is provided at a wire section 38 defining a starting portion of the forming section of the twin wire former 2 a number of the aforedescribed slotted dewatering devices 1 which contact the upper wire 3 during operation of such slotted dewatering devices 1 and the papermaking machine 30. Moreover, it will be seen a respective slotted dewatering device 1 is arranged at the wire region which is bounded by two neighboring support elements, such as the wire region between the support elements 11 and 12 and the wire region between the support elements 12 and 13, or stated somewhat differently, a respective slotted dewatering device 1 is arranged downstream of each support element 11, 12 and 13 as viewed with respect to the direction of travel 32 of the twin wire former 2.
Here too, it is advantageous to mount a plurality of the slotted dewatering devices in a ~tructural unit or mounting member, so that such slotted dewatering devices can be collectively positionally adjusted in the direction of the upper wire of the twin wire former.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be better understood and objects other than those set forth above, will become apparent when consideration is given to the following detailed description thereof. Such description makes reference to the annexed drawings wherein:
Fig. 1 is an enlarged view, partially in section, of a slotted dewatering device constructed according to the present invention;
Fig. 2 schematically illustrates a twin wire former of a papermaking machine which is equipped with slotted dewatering devices constructed according to the present invention; and 20~06~7 Fig. 3 schematically illustrates in fragmentary view a modified construction of a twin wire former of a papermaking machine which is equipped with such slotted dewatering devices and a modified arrangement of the headbox.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Describing now the drawings, it is to be understood that only enough of the construction of the papermaking machine including the slotted dewatering devices have been depicted therein, in order to simplify the illustration, as needed for those skilled in the art to readily understand the underlying principles and concepts of the present invention.
Turning attention initially to Fig. 1, there is depicted therein on an enlarged scale an exemplary embodiment of slotted dewatering device 1, in other words, a dewatering device equipped with a slotted nozzle structure, and as stated, also sometimes referred to in the papermaking art as an auto-slice.
This slotted dewatering device 1 can be particularly advantageously used in conjunction with a twin wire former 2 of a papermaking machine, generally indicated by reference numeral 30 in Fig. 3. Such slotted dewatering device 1 is primarily used for the removal of water of the stock suspension from the upper wire 3 of the twin wire former 2.
Each such slotted dewatering device 1 comprises a 20~0647 water-guiding or water-removal compartment or chamber 4 which is formed between two walls or wall members 5 and 6 which extend in the cross-machine direction, namely, transversely with respect to the upper wire 3 of the twin wire former 2 over the entire width of such upper wire 3. The wall 5 defines a front wall with respect to a predetermined direction of travel, generally indicated by the arrow 32, of the twin wire former 2. This front wall 5 is shorter in length, as viewed in the direction of the confronting upper wire 3 of the twin wire former 2, than the other wall 6 which defines a rear wall with respect to the predetermined direction of travel 32 of the twin wire former 2.
During operation of the slotted dewatering device 1, this rear wall 6 of the water-guiding compartment or chamber 4 extends up to the upper wire 3 of the twin wire former 2. Between the lower edge 5a of the shorter rear wall 5 and the upper wire 3 there is formed a gap or slot 7.
Continuing, it will be observed that the rear wall 6 comprises two essentially horizontally extending parts or portions 8 and 9, in other words, these parts 8 and 9 extend in the cross-machine direction of the papermaking machine 30. The wall part 8 defines an upper part which, during operation of the slotted dewatering device 1, is stationary, and the other part 9 which defines a lower part and confronts the upper wire 3, is constructed and arranged as a diaphragm which partially overlaps and is displaceable along the stationary upper part 8. As will be more fully explained shortly, this lower part 9 is adjustably 20~06~7 displaceable towards and away from the upper wire 3 of the twin wire :former 2. In each momentarily adjusted position of the lower part 9 with respect to the upper wire 3 such lower part g is elastically supported at the upper part 8 of the related slotted dewatering device 1.
A suitable drive, here shown as an adjustment or positioning motor 10 arranged between the upper part 8 and the lower part 9 serves to displace and elastically support this lower part 9 of the slotted dewatering device 1. In the exemplary construction under consideration, this adjustment or positioning motor 10 possesses two pressure chambers or compartments 22 and 23. The pressure chamber or compartment 22 defines an upper pressure chamber or compartment which is responsible for the upward movement of the lower part 9 with respect to the upper wire 3. The other pressure chamber or compartment 23 defines a lower pressure chamber or compartment which is responsible for the downward movement of the lower part 9 with respect to the upper wire 3.
These pressure chambers or compartments 22 and 23 are each lined by sealed, elastic hoses or tubes 22a and 23a, respectively, having suitable infeed or delivery means or ports 34 for the delivery of an appropriate pressurized fluid medium, such as compressed air, by way of example. This pressure is elastically supported, so that the lower edge or marginal portion 25 of the lower part 9 which confronts the upper wire 3 and which is provided with a wear-resistant layer or covering 24, can follow any changes in position of the upper wire 3 of the twin wire former 2. It should be appreciated the spatial position of the upper wire 3 can change during operation of the papermaking machine 30 by virtue of fluctuations in the thickness of the stock suspension layer or web which is disposed between the upper wire 3 and the lower wire 18 (see Fig. 2) of the twin wire former 2. This accommodation of the position of the upper wire 3 occurs automatically during operation of the papermaking machine 30.
During operation of the slotted dewatering device 1 and the papermaking machine 30, the water ascends upwardly through the water-guiding or water-removal compartment or chamber 4 and flows into a collecting chamber or compartment 26 through which it emerges by means of an outflow or discharge opening 27.
Depending upon the available space, this collecting chamber or compartment 26 can be arranged forwardly or rearwardly of the water-guiding or water-removal compartment or chamber 4.
With reference now to the exemplary embodiment of twin wire former 2 of the papermaking machine 30 shown in Fig. 2, it will be seen that there are provided a spaced sequence of such slotted dewatering devices 1 arranged downstream of a headbox 28 with respect to the predetermined direction of movement 32 of the twin wire former 2. Furthermore, it will be seen that the twin wire former 2 comprises a plurality of sequentially spaced support elements 11, 12, 13 and 14, 15, 16 and 17 defining 2~0647 support surfaces and arranged at the region of the lower wire 18 downstream of the headbox 28~ These support elements 11, 12, 13 and 14, 15, 16 and 17 are of conventional cons~ruction and serve both to downwardly remove water from the twin wire former 2 and to apply pressure pulses to the lower side of the stock suspension layer or web which is to be formed and which is sandwiched between the upper wire 3 and the lower wire 18 of this twin wire former 2. These upper and lower wires 3 and 18 travel along the supporting or support plane generally indicated by reference numeral 36 in Fig. 2.
Reverting further to such Fig. 2, it will be seen that in the direction of travel 32 of the upper wire 3 and the lower wire 18, there is provided at a wire section 38 defining a starting portion of the forming section of the twin wire former 2 a number of the aforedescribed slotted dewatering devices 1 which contact the upper wire 3 during operation of such slotted dewatering devices 1 and the papermaking machine 30. Moreover, it will be seen a respective slotted dewatering device 1 is arranged at the wire region which is bounded by two neighboring support elements, such as the wire region between the support elements 11 and 12 and the wire region between the support elements 12 and 13, or stated somewhat differently, a respective slotted dewatering device 1 is arranged downstream of each support element 11, 12 and 13 as viewed with respect to the direction of travel 32 of the twin wire former 2.
20~647 Furthermore, the wire section of the twin wire former 2 which is provided with the slotted dewatering devices 1 is followed by a downstream located wire section equipped with a conventional pressing device, here in the form of a suitable press shoe 19 which coacts with the further support elements 14, 15 and 16 located at the region of the lower wire 18 of the twin wire former 2. The stock suspension is delivered from a nozzle chamber 28a of the headbox 28 between the upper wire 3 and the lower wire 18 of the twin wire former 2 at the location of the superimposed breast rolls 20 and 21 defining upper and lower breast rolls. The upper breast roll 20 advantageously comprises a solid roll and the lower breast roll 21 an open roll which removes water of the stock suspension.
It is also possible, if necessary or desired, to mount the plurality of slotted dewatering devices 1 at a common mounting member or structure 29, as shown in Figs. 1 and 2, so that such slotted dewatering devices 1 can be collectively moved towards and away from the upper wire 3 of the twin wire former 2.
With reference now to Fig. 3, there is depicted a somewhat modified construction of the region of the papermaking machine 30 where there is introduced the stock suspension jet between the upper wire 3 and the lower wire 18 of the twin wire former 2. Here there is provided at the region of the lower breast roll 21' located opposite the upper breast roll 20' a 20~0647 headbox 28' having a nozzle chamber 28b which forms a stock suspension jet which is upwardly directed for deposition between the upper wire 3 and the lower wire 18 of the twin wire former 2. At the region where there is propelled the stock suspension jet ketween the upper wire 3 and the lower wire 18 there is arranged the first slotted dewatering device 1 of the sequential arrangement of such slotted dewatering devices 1. In all other respects, the twin wire former 2 may be constructed in the manner previously considered with reference to Fig. 2.
It is here mentioned for the sake of completeness that it is left to the discretion of the person skilled in the art as to how it is desired to arrange the elements which extract the stock suspension water or exert the pressure pulses upon the stock suspension, the slotted dewatering devices, the press shoes, the support elements, the ledges and so forth. Different combinations of the arrangement as well as the selection of these elements are possible and necessary for specific practical situations and accordingly advantageous. The same applies as concerns the selection of the supporting or support plane with regard to whether the same is to be linear, wave-like, ascending or descending in configuration.
Therefore, it is possible to devise, for instance, a twin wire former which, in contrast to the twin wire former 1 previously considered, has a wire section which initially possesses a pressing device containing a press shoe, like the 20~6~7 press shoe 19 of Fig. 2, arranged at the upper wire 3, and this initial wire section is followed by a further wire section equipped with a number of slotted dewatering devices, like the slotted dewatering devices 1 of Fig. 2.
In order to be able to more rapidly realize these different combinations by, for example, modifying an existing twin wire former, there can be provided the aforedescribed mounting or support structure 29 for the slotted dewatering devices 1 and at which there are mounted or displaceably guided the slotted dewatering devices 1.
It is also possible, if necessary or desired, to mount the plurality of slotted dewatering devices 1 at a common mounting member or structure 29, as shown in Figs. 1 and 2, so that such slotted dewatering devices 1 can be collectively moved towards and away from the upper wire 3 of the twin wire former 2.
With reference now to Fig. 3, there is depicted a somewhat modified construction of the region of the papermaking machine 30 where there is introduced the stock suspension jet between the upper wire 3 and the lower wire 18 of the twin wire former 2. Here there is provided at the region of the lower breast roll 21' located opposite the upper breast roll 20' a 20~0647 headbox 28' having a nozzle chamber 28b which forms a stock suspension jet which is upwardly directed for deposition between the upper wire 3 and the lower wire 18 of the twin wire former 2. At the region where there is propelled the stock suspension jet ketween the upper wire 3 and the lower wire 18 there is arranged the first slotted dewatering device 1 of the sequential arrangement of such slotted dewatering devices 1. In all other respects, the twin wire former 2 may be constructed in the manner previously considered with reference to Fig. 2.
It is here mentioned for the sake of completeness that it is left to the discretion of the person skilled in the art as to how it is desired to arrange the elements which extract the stock suspension water or exert the pressure pulses upon the stock suspension, the slotted dewatering devices, the press shoes, the support elements, the ledges and so forth. Different combinations of the arrangement as well as the selection of these elements are possible and necessary for specific practical situations and accordingly advantageous. The same applies as concerns the selection of the supporting or support plane with regard to whether the same is to be linear, wave-like, ascending or descending in configuration.
Therefore, it is possible to devise, for instance, a twin wire former which, in contrast to the twin wire former 1 previously considered, has a wire section which initially possesses a pressing device containing a press shoe, like the 20~6~7 press shoe 19 of Fig. 2, arranged at the upper wire 3, and this initial wire section is followed by a further wire section equipped with a number of slotted dewatering devices, like the slotted dewatering devices 1 of Fig. 2.
In order to be able to more rapidly realize these different combinations by, for example, modifying an existing twin wire former, there can be provided the aforedescribed mounting or support structure 29 for the slotted dewatering devices 1 and at which there are mounted or displaceably guided the slotted dewatering devices 1.
Claims (11)
1. A slotted dewatering device, especially for a twin wire former having upper and lower wires of a papermaking machine, for the removal of water of a stock suspension from the upper wire of the twin wire former, the upper wire having a predetermined direction of travel, comprising:
a compartment through which flows the water to be removed at the upper wire;
said compartment being defined between two walls extending transversely with respect to the upper wire substantially over the width of the upper wire;
said two walls defining a front wall and a rear wall with respect to the predetermined direction of travel of the upper wire;
said front wall having a lower edge;
said front wall being arranged in spaced relation with respect to the upper wire, so that there is formed a gap between the lower edge of the front wall and the upper wire;
the rear wall, during operation of the slotted dewatering device, extending up to the region of the upper wire;
means for elastically supporting the rear wall in the direction of the upper wire in an adjusted position of the rear wall; and means defining a guide surface provided at a side of the twin wire former located opposite to the slotted dewatering device.
a compartment through which flows the water to be removed at the upper wire;
said compartment being defined between two walls extending transversely with respect to the upper wire substantially over the width of the upper wire;
said two walls defining a front wall and a rear wall with respect to the predetermined direction of travel of the upper wire;
said front wall having a lower edge;
said front wall being arranged in spaced relation with respect to the upper wire, so that there is formed a gap between the lower edge of the front wall and the upper wire;
the rear wall, during operation of the slotted dewatering device, extending up to the region of the upper wire;
means for elastically supporting the rear wall in the direction of the upper wire in an adjusted position of the rear wall; and means defining a guide surface provided at a side of the twin wire former located opposite to the slotted dewatering device.
2. The slotted dewatering device according to claim 1, wherein:
said means defining said guide surface provides an elastic guide surface.
said means defining said guide surface provides an elastic guide surface.
3. The slotted dewatering device according to claim 2, further including:
means for regulating the position of at least one of the wires of the twin wire former between the slotted dewatering device and the elastic guide surface.
means for regulating the position of at least one of the wires of the twin wire former between the slotted dewatering device and the elastic guide surface.
4. The slotted dewatering device according to claim 1, wherein:
the rear wall comprises two parts arranged in essentially superimposed relationship and movable relative to one another;
said two parts defining upper and lower parts of the rear wall;
the upper part being stationary in the operating position of the slotted dewatering device;
the lower part confronting the upper wire of the twin wire former and comprising a diaphragm which is displaceable along the upper part and partially overlaps such upper part; and said elastically supporting means comprise means for adjustably displacing the lower part towards and away from the upper wire.
the rear wall comprises two parts arranged in essentially superimposed relationship and movable relative to one another;
said two parts defining upper and lower parts of the rear wall;
the upper part being stationary in the operating position of the slotted dewatering device;
the lower part confronting the upper wire of the twin wire former and comprising a diaphragm which is displaceable along the upper part and partially overlaps such upper part; and said elastically supporting means comprise means for adjustably displacing the lower part towards and away from the upper wire.
5. The slotted dewatering device according to claim 4, wherein:
said means for adjustably displacing the lower part towards and away from the upper wire comprises a positioning motor for the displacement and elastic support of the lower part of the rear wall.
said means for adjustably displacing the lower part towards and away from the upper wire comprises a positioning motor for the displacement and elastic support of the lower part of the rear wall.
6. The slotted dewatering device according to claim 5, wherein:
said positioning motor comprises two pressure chambers sealingly lined with hoses formed of an elastic material; and means for the delivery of pressurized fluid medium to each of the hoses.
said positioning motor comprises two pressure chambers sealingly lined with hoses formed of an elastic material; and means for the delivery of pressurized fluid medium to each of the hoses.
7. The slotted dewatering device according to claim 1, wherein:
the lower part of the rear wall has an edge facing towards the upper wire of the twin wire former; and a covering formed of a wear-resistant material provided for said edge of the lower part.
the lower part of the rear wall has an edge facing towards the upper wire of the twin wire former; and a covering formed of a wear-resistant material provided for said edge of the lower part.
8. The slotted dewatering device according to claim 1, further including:
means for mounting a plurality of the slotted dewatering devices, such that said plurality of slotted dewatering devices can be collectively adjusted in the direction of the upper wire of the twin wire former.
means for mounting a plurality of the slotted dewatering devices, such that said plurality of slotted dewatering devices can be collectively adjusted in the direction of the upper wire of the twin wire former.
9. The combination of:
a twin wire former of a papermaking machine;
a plurality of slotted dewatering devices provided for the twin wire former;
the twin wire former having a forming section disposed between upper and lower wires;
a plurality of support elements provided for the twin wire former;
the plurality of slotted dewatering devices being located at a starting portion of a wire section of the forming section of the twin wire former;
each of said slotted dewatering devices being arranged to contact the upper wire of the twin wire former;
each slotted dewatering device being arranged, as viewed with respect to a predetermined direction of travel of the twin wire former, downstream of an associated support element;
and the wire section provided with the slotted dewatering devices being followed by a wire section provided with a press device comprising a press shoe and a plurality of further support elements disposed at the lower wire at the region of the press shoe.
a twin wire former of a papermaking machine;
a plurality of slotted dewatering devices provided for the twin wire former;
the twin wire former having a forming section disposed between upper and lower wires;
a plurality of support elements provided for the twin wire former;
the plurality of slotted dewatering devices being located at a starting portion of a wire section of the forming section of the twin wire former;
each of said slotted dewatering devices being arranged to contact the upper wire of the twin wire former;
each slotted dewatering device being arranged, as viewed with respect to a predetermined direction of travel of the twin wire former, downstream of an associated support element;
and the wire section provided with the slotted dewatering devices being followed by a wire section provided with a press device comprising a press shoe and a plurality of further support elements disposed at the lower wire at the region of the press shoe.
10. The combination according to claim 9, wherein:
there is first arranged at a wire section of the upper wire, as viewed in the predetermined direction of travel of the twin wire former, the press shoe, and then such wire section is followed by a further wire section which is provided with a plurality of the slotted dewatering devices.
there is first arranged at a wire section of the upper wire, as viewed in the predetermined direction of travel of the twin wire former, the press shoe, and then such wire section is followed by a further wire section which is provided with a plurality of the slotted dewatering devices.
11. The combination according to claim 9, further including:
a pair of superimposed breast rolls defining upper and lower breast rolls arranged upstream of the wire section provided with the slotted dewatering devices;
the upper breast roll comprising a solid roll; and the lower breast roll comprising an open roll which removes water of the stock suspension.
a pair of superimposed breast rolls defining upper and lower breast rolls arranged upstream of the wire section provided with the slotted dewatering devices;
the upper breast roll comprising a solid roll; and the lower breast roll comprising an open roll which removes water of the stock suspension.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4028126A DE4028126C2 (en) | 1990-09-05 | 1990-09-05 | Slot nozzle, in particular for a twin wire former and their use in a twin wire former |
| DEP4028126.4 | 1990-09-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2050647A1 true CA2050647A1 (en) | 1992-03-13 |
Family
ID=6413634
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002050647A Abandoned CA2050647A1 (en) | 1990-09-05 | 1991-09-04 | Auto-slice, especially for a twin wire former |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0497932B1 (en) |
| AT (1) | ATE134233T1 (en) |
| CA (1) | CA2050647A1 (en) |
| DE (2) | DE4028126C2 (en) |
| FI (1) | FI97306C (en) |
| WO (1) | WO1992004500A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6982025B2 (en) | 2000-12-15 | 2006-01-03 | Astenjohnson, Inc. | Adjustable resilient blade support |
| US6984291B2 (en) | 2000-12-15 | 2006-01-10 | Astenjohnson, Inc. | Vacuum box with skimmer blade |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE29619709U1 (en) * | 1996-11-13 | 1997-01-09 | Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim | Screen section of a paper machine |
| DE19651241A1 (en) * | 1996-12-10 | 1998-06-18 | Voith Sulzer Papiermasch Gmbh | Double fourdrinier pulp water extraction |
| FI991356A (en) * | 1999-06-14 | 2000-12-15 | Valmet Corp | Procedure for removing water in the wire portion of a cellulose machine and drainage unit |
| AT503404A1 (en) * | 2006-04-13 | 2007-10-15 | Bartelmuss Klaus Ing | METHOD FOR CONTROLLING THE TEMPERATURE OF THE CERAMIC ELEMENTS OF A SUPPORTING DEVICE DIVIDING STRIP IN A PAPER PRODUCTION PLANT AND DEVICE AND SUPPORTING DEVICE. SPREADING STRIP FOR CARRYING OUT THIS PROCEDURE |
| DE102007035488A1 (en) * | 2007-07-28 | 2009-01-29 | Voith Patent Gmbh | Process for producing a fibrous web and twin-wire former for carrying out the process |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2143871B (en) * | 1983-07-23 | 1986-11-12 | Beloit Walmsley Ltd | Twin wire paper forming machine |
| EP0183806A4 (en) * | 1984-06-07 | 1987-11-30 | Design & Industry Pty Ltd | Eyeshield. |
| GB2174120B (en) * | 1985-04-26 | 1988-08-10 | Doerries Gmbh | Apparatus for guiding the wires of a twin wire forming section of a paper or cardboard machine |
| GB8710428D0 (en) * | 1987-05-01 | 1987-06-03 | Beloit Corp | Multi-ply web forming apparatus |
| FI77281C (en) * | 1987-06-18 | 1989-02-10 | Valmet Paper Machinery Inc | HYBRIDFORMARE FOER EN PAPPERSMASKIN. |
| FI85885C (en) * | 1987-11-25 | 1992-06-10 | Tampella Oy Ab | FOERFARANDE FOER FORMERING AV EN FIBERBANA I EN PAPPERSMASKIN SAMT EN ANORDNING FOER UTFOERING AV FOERFARANDET. |
| FI84637C (en) * | 1988-12-01 | 1991-12-27 | Valmet Paper Machinery Inc | FOERFARANDE OCH ANORDNING VID FORMNING AV PAPPERS- ELLER KARTONGBANA. |
| DE3842155A1 (en) * | 1988-12-15 | 1990-06-21 | Voith Gmbh J M | DOUBLE SCREEN FORM FOR PRODUCING A PAPER SHEET |
-
1990
- 1990-09-05 DE DE4028126A patent/DE4028126C2/en not_active Revoked
-
1991
- 1991-07-30 DE DE59107409T patent/DE59107409D1/en not_active Expired - Fee Related
- 1991-07-30 WO PCT/DE1991/000611 patent/WO1992004500A1/en active IP Right Grant
- 1991-07-30 AT AT91913352T patent/ATE134233T1/en not_active IP Right Cessation
- 1991-07-30 EP EP91913352A patent/EP0497932B1/en not_active Expired - Lifetime
- 1991-09-04 CA CA002050647A patent/CA2050647A1/en not_active Abandoned
-
1992
- 1992-04-23 FI FI921813A patent/FI97306C/en not_active IP Right Cessation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6982025B2 (en) | 2000-12-15 | 2006-01-03 | Astenjohnson, Inc. | Adjustable resilient blade support |
| US6984291B2 (en) | 2000-12-15 | 2006-01-10 | Astenjohnson, Inc. | Vacuum box with skimmer blade |
Also Published As
| Publication number | Publication date |
|---|---|
| FI97306B (en) | 1996-08-15 |
| DE4028126C2 (en) | 1993-10-14 |
| FI97306C (en) | 1996-11-25 |
| FI921813A (en) | 1992-04-23 |
| EP0497932B1 (en) | 1996-02-14 |
| WO1992004500A1 (en) | 1992-03-19 |
| FI921813A0 (en) | 1992-04-23 |
| DE59107409D1 (en) | 1996-03-28 |
| EP0497932A1 (en) | 1992-08-12 |
| DE4028126A1 (en) | 1992-03-19 |
| ATE134233T1 (en) | 1996-02-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |