US3839143A - Multi-ply two wire former wherein multiple headboxes are used and inflatable air bellows provide adjustments therebetween - Google Patents
Multi-ply two wire former wherein multiple headboxes are used and inflatable air bellows provide adjustments therebetween Download PDFInfo
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- US3839143A US3839143A US00260808A US26080872A US3839143A US 3839143 A US3839143 A US 3839143A US 00260808 A US00260808 A US 00260808A US 26080872 A US26080872 A US 26080872A US 3839143 A US3839143 A US 3839143A
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- 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
- D21F9/006—Complete machines for making continuous webs of paper of the twin-wire type paper or board consisting of two or more layers
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- 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
Definitions
- A1r inflatable bellows are 2,098,733 11/1937 162/130 connected between the inner slice lips of the outer 2,881,668 4/1959 Thomas 162 203 headbexes d t slice walls of the intermediate 2,911,039 11/1959 Hornbostel et a1. 162/303 headbox to control the thicknesses of'the outer plys. 2,928,464 3/1960 Western et al 162/347 3,607,625 9 1971 Hill et a1.
- the invention relates to improvements in methods and structures for making multi-ply web and particularly to a paper making machine wherein the web is formed of layers of stock with the layers having different characteristics.
- each ply should be well formed and perform its function to contribute to the characteristic of the board as a whole. For this purpose it is desirable to avoid mixing of the plys and yet it is essential that the plys bond to each other with optimum strength.
- Multi-ply board has been conventionally made by various processes and primarily by being made on cylinder machines where successive plys are formed on cylinders immersed in slurries of stock and with the stock layer being formed on the uprunning side of the cylinder as it emerges from the vat of the slurry. As each successive layer is formed, it is fed onto the top of a layer formed in another cylinder until the requisite number of layers are completed.
- An object of the present invention is to provide an improved method of making multi-ply web wherein a better intermediate layer is formed with better fiber distribution for improved qualities of strength and uniformity.
- a further object of the invention is to provide a multi-ply web making machine wherein the intermediate layer and the outer layers are formed substantially simultaneously with the intermediate layer being dewatered through the outer layers for improved bonding between layers, and with the intermediate layer formed of a higher consistency stock to reduce the amount of water which must flow through the outer layers.
- a further object of the invention is to provide a mechanism for making multi-ply web wherein the plys are formed of different stock slurries which are dewatered substantially at the same time and wherein intermixing between the slurries is maintained at a minimum.
- a feature of the present invention is the provision of a twin wire forming machine wherein outer layers are fed into a forming throat slightly in advance of the intermediate layer to prevent intermixing and the intermediate layer is fed into the throat after the dry line of the outer layers and is provided with a high consistency stock with means preventing flocculation of the high consistency stock.
- the mechanism includes first and second looped continuous forming wires 10 and 11.
- the wires are strung over supports so that they come together to form a dewatering run 12. Upstream of the dewatering run is a converging throat 13.
- the wires travel through an arcuate path over a box 15 having a plurality of cross-machine extending foils 15a which are spaced in the machine direction so that the wires actually extend in sequential chordal spans between the foils.
- the wires gradually converge applying normal pressure to the layers of stock therebetween and water passes out through both sides of the wires 10 and 11 along the dewartering run 12.
- a suction box 25 within the wires 11 for additional dewatering Following the box 15 is a suction box 25 within the wires 11 for additional dewatering, and the web will follow the wire 11 around a couch roll 16 which has a suction gland 16a.
- the web will be picked off of the wire 11 by a pick-up roll 17 having a suction gland 17a therein and carrying a pickup felt 18.
- the wire 11 is additionally trained over return and tension rolls l9 and 20.
- the wire 10 wraps up over the couch roll 16 being trained thereover by its couch roll 21, and it returns over a roll such as 22.
- the wires 10 and 11 are carried into the forming throat 13 over breast rolls 23 and 24.
- suction rolls 23 and 24 have the usual perforate rotary shell structure, and the sequential glands are each connected to their own source of suction for drawing water through the shell and applying suction to the layer of slurry deposited on the wires to form the outer layers of the multi-ply web.
- suction is applied so that it increases from 24a through 240, and similarly so that it increases from 23a to 230.
- the first outer layer of the multi-ply web is formed by stock delivered through a slice opening 29 and the opposite outer layer of the web is formed by stock delivered through a slice opening 31.
- the slice opening 29 is formed between slice lips 39 and 40.
- the slice opening 31 is formed between slice lips 41 and 42.
- the inner slice lips 40 and 42 extend for some distance into the forming throat to guide the stock and aid in its initial formation on the wires and 11.
- the intermediate layer of stock is delivered through a slice opening 30 between the outer openings 29 and 311..
- Stock for the intermediate layer is provided from a headbox 26.
- Stock for the outer layers is provided from headboxes 27 and 28. Separate flows of stock are delivered to the separate headboxes 27 and 28 through separate supply lines 27b and 28b as shown schematically in the drawing.
- the headboxes 27 and 28 have flow tubes 27a and 28a respectively extending in the direction of stock flow for orienting the flow of the slurry and helping maintain uniform fiber distribution in the stock.
- the intermediate headbox similarly has a plurality of flow tubes 32 extending in the direction of stock flow and maintaining turbulence and energy in the stock.
- the stock supplied to the intermediate headbox is preferably a high consistency stock inasmuch as it is dewatered through the outer plys which are placed onto the forming wires in advance of the discharge of the intermediate jet of stock through the slice opening 30.
- the slice openings 29 and 311 are positioned to first deliver onto the wires and the dewatering effect through the wires is such that the intermediate layer is delivered into the throat to engage the outer layers after their dry line has been formed. This insures adequate formation of the outer layers so that there is not a mixing of the stock forming the plys.
- a tapered slice chamber leading to the slice opening 30 is provided by the tapering slice walls 33 and 34 for the intermediate headbox 26.
- a plate 35 with a plurality of flow distribution openings therethrough.
- This plate provides a support for a plurality of cross-machine extending flexible trailing elements 36.
- These trailing elements are of plastic or similar flexible material and are anchored at their upstream ends only with their downstream ends self-positioned by the pressures of the flowing stock within the slice.
- the trailing elements 36 may be continuous sheets extending in a cross-machine direction, or may be divided into separate strands. They are preferably uniform in cross section, but may be tapered in a downstream direction. Suitable means are provided for attaching the trailing elements to the upstream plate 35 in such a manner that pockets are not formed where concentrations of fibers can collect.
- Suitable stock delivery means are provided for each of the headboxes, and these will be fully understood by those versed in the art and are omitted from the drawings for the sake of clarity.
- the intermediate headbox 26 is rigidly supported and has rigid outer walls 37 and 38. These walls support operating mechanisms for positioning the inner slice lips 40 and 42 of the slices for the outer headboxes. These operating mechanisms are shown preferably in the form of air inflatable bellows or diaphragms 43 and 44 which extend continuously in a cross-machine direction to provide uniform support to the movable walls which position the slice lips 40 and 42. Air at a controlled pressure is directed into these bellows 43 and 44 to adjust the position of the slice lips 40 and 42 and thereby control the thickness of the outer layers.
- the slice walls 33 and 34 or the distal end which controls the size of the slice opening 30 is movable by a mechanism not shown to control the thickness of the intermediate ply for the web.
- the multi-ply web formed is of improved strength in that it obtains optimum preformance from the intermediate ply which usually is formed of an inexpensive low quality stock, and with the present arrangement, a high consistency stock is employed for improved dewatering efficiency and yet flocculation is avoided and good fiber distribution is attained.
- a forming mechanism for forming a multi-ply continuous fibrous web comprising in combination,
- first and second looped forming wires positioned to provide a dewatering run therebetween with the wires converging to form a throat at the upstream end of said run
- an intermediate headbox having a slice opening for delivering a jet of stock slurry to the throat for forming an intermediate ply of said web
- a first outer headbox having a slice opening for delivering a jet of stock slurry to the throat outwardly of the intermediate slice opening for forming an outer layer
- a second outer headbox having a slice opening for delivering a jet of stock slurry to the throat on the opposite side of the intermediate slice opening for forming an outer layer, and first and second separate stock supply means connected respectively for delivering separate supplies of stock to said first and second headboxes,
- said slice openings of said first and second outer headboxes positioned for delivery of the stock to the throat at a position upstream relative to the intermediate headbox slice opening so that a dry line appears before the intermediate jet of stock engages the outer layers of the stock on the wires.
- a forming mechanism for forming a multi-ply continuous fibrous web constructed in accordance with claim 1 wherein said breast rolls are provided with suction glands therein and having an outer perforate rotating shell for drainage of water through the rolls.
- a forming mechanism for forming a multi-ply continuous fibrous web constructed in accordance with claim 2 wherein each of said breast rolls has a series of separate suction glands to provide successive different negative pressures within the suction rolls for dewatering the outer layers of the web.
- a forming mechanism for forming a multi-ply continuous fibrous web constructed in accordance with claim 1 wherein said outer headboxes each have a movable slice lip adjacent the intermediate headbox with means for moving said lips to adjust the slice opening of said outer headboxes.
- a forming mechanism for forming a multi-ply continuous fibrous web constructed in accordance with claim 4 wherein said means for moving said movable slice lips of the outer headboxes is a control mechanism mounted on the walls of said intermediate headbox.
- a forming mechanism for forming a'multi-ply continuous fibrous web constructed in accordance with claim 5 wherein said slice lip moving mechanism consists of air bags mounted on the outer walls of said intermediate headbox.
- a forming mechanism for forming a multi-ply continuous fibrous web constructed in accordance with claim 1 wherein said intermediate headbox has an elongate tapered slice chamber leading to its slice opening with a plurality of flexible trailing elements in said tapered slice chamber supported only at their upstream ends and positioned downstream of their support solely by the pressures of the stock in the slice chamber.
- each of said headboxes has a plurality of separate flow passages extending in the direction of stock flow toward the slice opening.
- said intermediate jet of stock being delivered into the throat at a location after the appearance of a dry line through the outer layers on the forming wires.
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Abstract
A method and mechanism for forming multi-ply continuous fibrous web by providing a twin wire former including first and second looped forming wires positioned to provide a dewatering run therebetween with a tapered throat at the upstream end of the run and supporting rolls within each of the wires including suction breast rolls having a plurality of suction glands within the rolls for the graduated application of suction to the wires and an intermediate headbox delivering a jet of stock slurry into the throat with outer headbox delivery outer jets for the outer layers of the web and the intermediate jet being delivered after the dry line of the outer layers. Air inflatable bellows are connected between the inner slice lips of the outer headboxes and the slice walls of the intermediate headbox to control the thicknesses of the outer plys.
Description
United States Patent Suckow 1 Oct. 1, 1974 [54] MULTI-PLY TWO WIRE FORMER 3,619,362 11/1971 Parker 162 347 WHERE MULTIPLE HEADBOXES ARE FOREIGN PATENTS OR APPLICATIONS USED AND INFLATABLE AIR BELLOWS I 904 962 8/1970 Germany 62/301 PROVIDE ADJUSTMENTS '565I496 11/1958 Canada 162/347 THEREBETWEEN [75] Inventor: Robert A. Suckow, Portland, Oreg. Primary Examiner-S. Leon Bashore Assistant ExaminerRichard H. Tushin [73] Asslgnee' Belolt Corporatlon Belolt Attorney, Agent, or Firm-Hill, Gross, Simpson, Van [22] Filed: June 8, 1972 Santen, Steadman, Chiara & Simpson [21] Appl. No.: 260,808
[57] ABSTRACT 52 US. Cl 162/123, 162/129, 162/203, A method and mechanism for forming -p y l62/299, 162/301, 162/303, 162/343, 162/347 tinuous fibrous web by providing a twin wire former 51 1111. c1. D21f 1/00, D21f 11/04, D2lf 11/08 including first and Second looped forming Wires P 8] Fie d Of Search 162/ 301, 203, 303, 123, tioned to provide a dewatering run therebetween with 1 2 133 130 304 347 343 29 299 302 a tapered throat at the upstream end of the run and 129 supporting rolls within each of the wires including suction breast rolls having a plurality of suction glands [56] References it within the rolls for the graduated application of suc- UNITED STATES PATENTS tion tO the wires and an intermediate headboit deliver- 1018 588 9 2 1 ing a et of stock slurry mto the throat wlth outer l,7l8,5 2/1 1 S0811 an 162/304 headbox delivery Outer j for the Outer layers of the 74 6/1929 Mlllspaugh 162/303 X 1,782,214 11 1930 Sheperd 162/303 x web F the Jet F'P del'vered after the 1,875,075 8/1932 Mason n 162 /203 X dry llne of the outer layers. A1r inflatable bellows are 2,098,733 11/1937 162/130 connected between the inner slice lips of the outer 2,881,668 4/1959 Thomas 162 203 headbexes d t slice walls of the intermediate 2,911,039 11/1959 Hornbostel et a1. 162/303 headbox to control the thicknesses of'the outer plys. 2,928,464 3/1960 Western et al 162/347 3,607,625 9 1971 Hill et a1. 162/343 9 ClalmS, 1 Drawing Figure MULTI-PLY TWO WIRE FORMER WHEREIN MULTIPLE HEADBOXES ARE USED AND INFLATABLE AIR BELLOWS PROVIDE ADJUSTMENTS TI-IEREBETWEEN BACKGROUND OF THE INVENTION The invention relates to improvements in methods and structures for making multi-ply web and particularly to a paper making machine wherein the web is formed of layers of stock with the layers having different characteristics.
While the principles of the invention can be employed in making webs of various types, such as nonwoven fabrics, they are particularly well adapted to use for making multi-ply paperboard and will be described principally in that environment. In the manufacture of multi-ply board, layers having different characteristics are used. The center or intermediate layer is frequently employed as a filler to give body and stiffness to the board while the outer layers, at least on one side is usually of a finer grade which has ink receptivity for receiving printing. To improve the quality of this board and to maintain the manufacturing cost at a minimum, each ply should be well formed and perform its function to contribute to the characteristic of the board as a whole. For this purpose it is desirable to avoid mixing of the plys and yet it is essential that the plys bond to each other with optimum strength.
To provide strength and body to the intermediate layer, it is essential that optimum strength formation with the type of stock provided be obtained. A minimum of flocculation will, of course, add to the strength and uniformity of thickness of the intermediate layer and provide the best strength intermediate layer for functioning to support the outer layers. Multi-ply board has been conventionally made by various processes and primarily by being made on cylinder machines where successive plys are formed on cylinders immersed in slurries of stock and with the stock layer being formed on the uprunning side of the cylinder as it emerges from the vat of the slurry. As each successive layer is formed, it is fed onto the top of a layer formed in another cylinder until the requisite number of layers are completed. This requires forming the intermediate layer by a conventional cylinder forming method which does not obtain absence of flocculation. Also, in this method of manufacture, good bonding between layers is not always attained since each of the layers are substantially dewatered when laid on the top of another layer and, therefore, interlacing or bonding between the fibers of the different layers is not achieved.
An object of the present invention is to provide an improved method of making multi-ply web wherein a better intermediate layer is formed with better fiber distribution for improved qualities of strength and uniformity.
A further object of the invention is to provide a multi-ply web making machine wherein the intermediate layer and the outer layers are formed substantially simultaneously with the intermediate layer being dewatered through the outer layers for improved bonding between layers, and with the intermediate layer formed of a higher consistency stock to reduce the amount of water which must flow through the outer layers. This includes the objective of an improved mechanism and method of forming the intermediate layer by preventing flocculation of the higher consistency stock.
A further object of the invention is to provide a mechanism for making multi-ply web wherein the plys are formed of different stock slurries which are dewatered substantially at the same time and wherein intermixing between the slurries is maintained at a minimum.
A feature of the present invention is the provision of a twin wire forming machine wherein outer layers are fed into a forming throat slightly in advance of the intermediate layer to prevent intermixing and the intermediate layer is fed into the throat after the dry line of the outer layers and is provided with a high consistency stock with means preventing flocculation of the high consistency stock.
Other objects, advantages and features, as well as equivalent structures and methods which are intended to be covered herein, will become apparent to those versed in the art in connection with the teaching of the principles of the invention in the disclosure of the specification, claims, and drawings, in which:
DESCRIPTION OF THE DRAWINGS chine constructed and operating in accordance with the principles of the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS The mechanism includes first and second looped continuous forming wires 10 and 11. The wires are strung over supports so that they come together to form a dewatering run 12. Upstream of the dewatering run is a converging throat 13. In the dewatering run the wires travel through an arcuate path over a box 15 having a plurality of cross-machine extending foils 15a which are spaced in the machine direction so that the wires actually extend in sequential chordal spans between the foils. The wires gradually converge applying normal pressure to the layers of stock therebetween and water passes out through both sides of the wires 10 and 11 along the dewartering run 12. Following the box 15 is a suction box 25 within the wires 11 for additional dewatering, and the web will follow the wire 11 around a couch roll 16 which has a suction gland 16a. The web will be picked off of the wire 11 by a pick-up roll 17 having a suction gland 17a therein and carrying a pickup felt 18. The wire 11 is additionally trained over return and tension rolls l9 and 20.
The wire 10 wraps up over the couch roll 16 being trained thereover by its couch roll 21, and it returns over a roll such as 22.
The wires 10 and 11 are carried into the forming throat 13 over breast rolls 23 and 24.
Within the breast rolls are a series of sequential suction glands such as shown at 23a, 23b and 230 for the suction roll 23 and at 24a, 24b and 240 for the suction roll 24. The suction rolls 23 and 24 have the usual perforate rotary shell structure, and the sequential glands are each connected to their own source of suction for drawing water through the shell and applying suction to the layer of slurry deposited on the wires to form the outer layers of the multi-ply web. Preferably, suction is applied so that it increases from 24a through 240, and similarly so that it increases from 23a to 230.
The first outer layer of the multi-ply web is formed by stock delivered through a slice opening 29 and the opposite outer layer of the web is formed by stock delivered through a slice opening 31. The slice opening 29 is formed between slice lips 39 and 40. The slice opening 31 is formed between slice lips 41 and 42. The inner slice lips 40 and 42 extend for some distance into the forming throat to guide the stock and aid in its initial formation on the wires and 11.
The intermediate layer of stock is delivered through a slice opening 30 between the outer openings 29 and 311..
Stock for the intermediate layer is provided from a headbox 26. Stock for the outer layers is provided from headboxes 27 and 28. Separate flows of stock are delivered to the separate headboxes 27 and 28 through separate supply lines 27b and 28b as shown schematically in the drawing. The headboxes 27 and 28 have flow tubes 27a and 28a respectively extending in the direction of stock flow for orienting the flow of the slurry and helping maintain uniform fiber distribution in the stock. The intermediate headbox similarly has a plurality of flow tubes 32 extending in the direction of stock flow and maintaining turbulence and energy in the stock.
The stock supplied to the intermediate headbox is preferably a high consistency stock inasmuch as it is dewatered through the outer plys which are placed onto the forming wires in advance of the discharge of the intermediate jet of stock through the slice opening 30. With this arrangement, the slice openings 29 and 311 are positioned to first deliver onto the wires and the dewatering effect through the wires is such that the intermediate layer is delivered into the throat to engage the outer layers after their dry line has been formed. This insures adequate formation of the outer layers so that there is not a mixing of the stock forming the plys. Yet, additional dewatering will occur through each of the three plys, and a sufficient bonding will occur between the fibers of the plys to provide a strong monolithic multi-ply board web. As the outer layers are first formed, and the intermediate layers subsequently fed between the outer layers in the throat 13, additional vacuum is applied through the suction regions 24b and 24c, and 23b and 236 to dewater through the outer layers. Subsequent dewatering occurs throughout the dewatering run 112 as the multi-ply web is pressed between the wires in its travel over the dewatering box and the suction box and over the couch roll 16.
In order to help maintain the fine scale turbulence and distribution of fibers in the relatively high consistency stock of the intermediate layer, a tapered slice chamber leading to the slice opening 30 is provided by the tapering slice walls 33 and 34 for the intermediate headbox 26. Immediately upstream of the tapering slice chamber is a plate 35 with a plurality of flow distribution openings therethrough. This plate provides a support for a plurality of cross-machine extending flexible trailing elements 36. These trailing elements are of plastic or similar flexible material and are anchored at their upstream ends only with their downstream ends self-positioned by the pressures of the flowing stock within the slice. The trailing elements 36 may be continuous sheets extending in a cross-machine direction, or may be divided into separate strands. They are preferably uniform in cross section, but may be tapered in a downstream direction. Suitable means are provided for attaching the trailing elements to the upstream plate 35 in such a manner that pockets are not formed where concentrations of fibers can collect.
Suitable stock delivery means are provided for each of the headboxes, and these will be fully understood by those versed in the art and are omitted from the drawings for the sake of clarity.
The intermediate headbox 26 is rigidly supported and has rigid outer walls 37 and 38. These walls support operating mechanisms for positioning the inner slice lips 40 and 42 of the slices for the outer headboxes. These operating mechanisms are shown preferably in the form of air inflatable bellows or diaphragms 43 and 44 which extend continuously in a cross-machine direction to provide uniform support to the movable walls which position the slice lips 40 and 42. Air at a controlled pressure is directed into these bellows 43 and 44 to adjust the position of the slice lips 40 and 42 and thereby control the thickness of the outer layers. The slice walls 33 and 34 or the distal end which controls the size of the slice opening 30 is movable by a mechanism not shown to control the thickness of the intermediate ply for the web.
Thus, it will be seen that I have provided an improved multi-ply web forming mechanism which meets the objectives and advantages above set forth. The multi-ply web formed is of improved strength in that it obtains optimum preformance from the intermediate ply which usually is formed of an inexpensive low quality stock, and with the present arrangement, a high consistency stock is employed for improved dewatering efficiency and yet flocculation is avoided and good fiber distribution is attained.
I claim as my invention:
1. A forming mechanism for forming a multi-ply continuous fibrous web comprising in combination,
first and second looped forming wires positioned to provide a dewatering run therebetween with the wires converging to form a throat at the upstream end of said run,
a supporting open breast roll within each of the wires positioned for converging them to form said throat,
an intermediate headbox having a slice opening for delivering a jet of stock slurry to the throat for forming an intermediate ply of said web,
a first outer headbox having a slice opening for delivering a jet of stock slurry to the throat outwardly of the intermediate slice opening for forming an outer layer, I
a second outer headbox having a slice opening for delivering a jet of stock slurry to the throat on the opposite side of the intermediate slice opening for forming an outer layer, and first and second separate stock supply means connected respectively for delivering separate supplies of stock to said first and second headboxes,
the stock from each of said outer headboxes having initial dewatering in said throat into said breast rolls,
said slice openings of said first and second outer headboxes positioned for delivery of the stock to the throat at a position upstream relative to the intermediate headbox slice opening so that a dry line appears before the intermediate jet of stock engages the outer layers of the stock on the wires.
2. A forming mechanism for forming a multi-ply continuous fibrous web constructed in accordance with claim 1 wherein said breast rolls are provided with suction glands therein and having an outer perforate rotating shell for drainage of water through the rolls.
3. A forming mechanism for forming a multi-ply continuous fibrous web constructed in accordance with claim 2 wherein each of said breast rolls has a series of separate suction glands to provide successive different negative pressures within the suction rolls for dewatering the outer layers of the web.
4. A forming mechanism for forming a multi-ply continuous fibrous web constructed in accordance with claim 1 wherein said outer headboxes each have a movable slice lip adjacent the intermediate headbox with means for moving said lips to adjust the slice opening of said outer headboxes.
5. A forming mechanism for forming a multi-ply continuous fibrous web constructed in accordance with claim 4 wherein said means for moving said movable slice lips of the outer headboxes is a control mechanism mounted on the walls of said intermediate headbox.
6. A forming mechanism for forming a'multi-ply continuous fibrous web constructed in accordance with claim 5 wherein said slice lip moving mechanism consists of air bags mounted on the outer walls of said intermediate headbox.
7. A forming mechanism for forming a multi-ply continuous fibrous web constructed in accordance with claim 1 wherein said intermediate headbox has an elongate tapered slice chamber leading to its slice opening with a plurality of flexible trailing elements in said tapered slice chamber supported only at their upstream ends and positioned downstream of their support solely by the pressures of the stock in the slice chamber.
8. A forming mechanism for forming a multi-ply continuous web constructed in accordance with claim 7 wherein each of said headboxes has a plurality of separate flow passages extending in the direction of stock flow toward the slice opening.
9. The method of forming a multi-ply continuous fi brous web which comprises the steps,
training first and second looped forming wires to provide a dewatering run therebetween with a tapered forming throat at the upstream end of said run, directing an intermediate jet of stock slurry into the throat for forming an intermediate ply of said web,
and directing separate outer jets of stock slurry each outwardly of the intermediate jet into the throat to engage the wires in advance of the intermediate jet for forming the outer layers of the multi-ply web,
said intermediate jet of stock being delivered into the throat at a location after the appearance of a dry line through the outer layers on the forming wires.
Claims (9)
1. A FORMING MECHANISM FOR FORMING A MULTI-PLY CONTINUOUS FIBROUS WEB COMPRISING IN COMBINATION, FIRST AND SECOND LOOPED FORMING WIRES POSITIONED TO PROVIDE A DEWATERING RUN THEREBETWEEN WITH THE WIRES CONVERGING TO FORM A THROAT AT THE UPSTREAM END OF SAID RUN, A SUPPORTING OPEN BREAST ROLL WITHIN EACH OF THE WIRES POSITIONED FOR CONVERGING THEN TO FORM SAID THROAT, AN INTERMEDIATE HEADBOX HAVING A SLICE OPENING FOR DELIVERING A JET OF STOCK SLURRY TO THE THROAT FOR FORMING AN INTERMEDIATE PLY OF SAID WEB, A FIRST OUTER HEADBOXY HAVING A SLICE OPENING FOR DELIVERING A JET OF STOCK SLURRY TO THE THROAT OUTWARDLY OF THE INTERMEDIATE SLICE OPENING FOR FORMING AN OUTER LAYER, A SECOND OUTER HEADBOX HAVING A SLICE OPENING FOR DELIVERING A JET OF STOCK SLURRY TO THE THROAT ON THE OPPOSITE SIDE OF THE INTERMEDIATE SLICE OPENING FOR FORMING AN OUTER LAYER, AND FIRST AND SECOND SEPARATE STOCK SUPPLY MEANS CONNECTED RESPECTIVELY FOR DELIVERING SEPARATE SUPPLIES OF STOCK TO SAID FIRST AND SECOND HEADBOXES, THE STOCK FROM EACH OF SAID OUTER HEADBOXES HAVING INITIAL DEWATERING IN SAID THROAT INTO SAID BREAST ROLLS, SAID SLICE OPENINGS OF SAID FIRST AND SECOND OUTER HEADBOXES POSITIONED FOR DELIVERY OF THE STOCK TO THE THROAT AT A POSITION UPSTREAM RELATIVE TO THE INTERMEDIATE HEADBOX SLICE OPENING SO THAT A DRY LINE APPEARS BEFORE THE INTERMEDIATE JET OF STOCK ENGAGES THE OUTER LAYER OF THE STOCK ON THE WIRES.
2. A forming mechanism for forming a multi-ply continuous fibrous web constructed in accordance with claim 1 wherein said breast rolls are provided with suction glands therein and having an outer perforate rotating shell for drainage of water through the rolls.
3. A forming mechanism for forming a multi-ply continuous fibrous web constructed in accordance with claim 2 wherein each of said breast rolls has a series of separate suction glands to provide successive different negative pressures within the suction rolls for dewatering the outer layers of the web.
4. A forming mechanism for forming a multi-ply continuous fibrous web constructed in accordance with claim 1 wherein said outer headboxes each have a movable slice lip adjacent the intermediate headbox with means for moving said lips to adjust the slice opening of said outer headboxes.
5. A forming mechanism for forming a multi-ply continuous fibrous web constructed in accordance with claim 4 wherein said means for moving said movable slice lips of the outer headboxes is a control mechanism mounted on the walls of said intermediate headbox.
6. A forming mechanism for forming a multi-ply continuous fibrous web constructed in accordance with claim 5 wherein said slice lip moving mechanism consists of air bags mounted on the outer walls of said intermediate headbox.
7. A forming mechanism for forming a multi-ply continuous fibrous web constructed in accordance with claim 1 wherein said intermediate headbox has an elongate tapered slice chamber leading to its slice opening with a plurality of flexible trailing elements in said tapered slice chamber supported only at their upstream ends and positioned downstream of their support solely by the pressures of the stock in the slice chamber.
8. A forming mechanism for forming a multi-ply continuous web constructed in accordance with claim 7 wherein each of said headboxes has a plurality of separate flow passages extending in the direction of stock flow toward the slice opening.
9. The method of forming a multi-ply continuous fibrous web which comprises the steps, training first and second looped forming wires to provide a dewatering run therebetween with a tapered forming throat at the upstream end of said run, directing an intermediate jet of stock slurry into the throat for forming an intermediate ply of said web, and directing separate outer jets of stock slurry each outwardly of the intermediate jet into the throat to engage the wires in advance of the intermediate jet for forming the outer layers of the multi-ply web, said intermediate jet of stock being delivered into the throat at a location after the appearance of a dry line through the outer layers on the forming wires.
Priority Applications (16)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00260808A US3839143A (en) | 1972-06-08 | 1972-06-08 | Multi-ply two wire former wherein multiple headboxes are used and inflatable air bellows provide adjustments therebetween |
GB2433373A GB1418057A (en) | 1972-06-08 | 1973-05-22 | Method and apparatus for forming a fibrous web of three or more plies |
AR248241A AR196668A1 (en) | 1972-06-08 | 1973-05-28 | TRAINING MECHANISM TO FORM A CONTINUOUS MULTI-LAYERED FIBROUS NETWORK |
FI1724/73A FI61217C (en) | 1972-06-08 | 1973-05-29 | FLOWER FORMAT WITH A TV OFFICE |
BE131637A BE800178A (en) | 1972-06-08 | 1973-05-29 | TWO-SHEET DEVICE FOR FORMING A CONTINUOUS SHEET WITH SEVERAL JETS, |
ZA733652A ZA733652B (en) | 1972-06-08 | 1973-05-29 | Multi-ply two wire former |
SE7307778A SE397549B (en) | 1972-06-08 | 1973-06-01 | DEVICE FOR THE PRODUCTION OF A MULTI-LAYER CONTINUOUS FIBER MATERIAL PATH |
JP7360981A JPS5214331B2 (en) | 1972-06-08 | 1973-06-01 | |
ES415529A ES415529A1 (en) | 1972-06-08 | 1973-06-04 | Multi-ply two wire former wherein multiple headboxes are used and inflatable air bellows provide adjustments therebetween |
NL7307840A NL7307840A (en) | 1972-06-08 | 1973-06-05 | |
FR7321562A FR2187990B1 (en) | 1972-06-08 | 1973-06-06 | |
BR4215/73A BR7304215D0 (en) | 1972-06-08 | 1973-06-06 | MECHANISM AND FORMATION PROCESS TO FORM A CONTINUOUS FIBROUS SCREEN OF MULTIPLE LAYERS |
CA173,507A CA971407A (en) | 1972-06-08 | 1973-06-07 | Two wire former for making multiply paper |
AU56736/73A AU5673673A (en) | 1972-06-08 | 1973-06-08 | Multiply two wire former |
DE2329658A DE2329658C3 (en) | 1972-06-08 | 1973-06-09 | Twin-wire paper machine for the production of a multi-layer paper web |
IT25192/73A IT990621B (en) | 1972-06-08 | 1973-06-12 | DOUBLE FORMING CLOTH FOR MANUFACTURING A MULTI-LAYER PAPER TAPE |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00260808A US3839143A (en) | 1972-06-08 | 1972-06-08 | Multi-ply two wire former wherein multiple headboxes are used and inflatable air bellows provide adjustments therebetween |
Publications (1)
Publication Number | Publication Date |
---|---|
US3839143A true US3839143A (en) | 1974-10-01 |
Family
ID=22990703
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00260808A Expired - Lifetime US3839143A (en) | 1972-06-08 | 1972-06-08 | Multi-ply two wire former wherein multiple headboxes are used and inflatable air bellows provide adjustments therebetween |
Country Status (16)
Country | Link |
---|---|
US (1) | US3839143A (en) |
JP (1) | JPS5214331B2 (en) |
AR (1) | AR196668A1 (en) |
AU (1) | AU5673673A (en) |
BE (1) | BE800178A (en) |
BR (1) | BR7304215D0 (en) |
CA (1) | CA971407A (en) |
DE (1) | DE2329658C3 (en) |
ES (1) | ES415529A1 (en) |
FI (1) | FI61217C (en) |
FR (1) | FR2187990B1 (en) |
GB (1) | GB1418057A (en) |
IT (1) | IT990621B (en) |
NL (1) | NL7307840A (en) |
SE (1) | SE397549B (en) |
ZA (1) | ZA733652B (en) |
Cited By (32)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3944464A (en) * | 1974-05-10 | 1976-03-16 | International Paper Company | Forming section for twin-wire papermaking machine |
US3970514A (en) * | 1974-02-15 | 1976-07-20 | Oy Tampella Ab | Combination-paper machine |
US4021295A (en) * | 1975-05-05 | 1977-05-03 | Beloit Corporation | Method and apparatus for supplying white water from a single silo in the formation of a multi-ply web |
US4036684A (en) * | 1975-08-04 | 1977-07-19 | Beloit Corporation | High bulk tissue forming and drying apparatus |
DE2732361A1 (en) * | 1976-07-16 | 1978-01-26 | Beloit Corp | CONTROL DEVICE FOR A REFUGEER WITH MULTIPLE CHANNELS FOR A PAPER MACHINE FOR THE PRODUCTION OF MULTI-LAYERED PAPER WEB |
US4113557A (en) * | 1976-04-14 | 1978-09-12 | Valmet Oy | Paper manufacturing structure particularly for detaching a web from a wire |
US4125428A (en) * | 1977-06-27 | 1978-11-14 | The Black Clawson Company | Vertical twin wire paper machine |
DE2824608A1 (en) * | 1977-07-13 | 1979-01-25 | Tampella Oy Ab | FEEDING APPARATUS IN A WEB FORMING MACHINE FOR THE PRODUCTION OF A TWO- OR MULTI-LAYER FIBER WEB |
WO1981002903A1 (en) * | 1980-04-11 | 1981-10-15 | Valmet Oy | Headbox for a paper machine |
DE3221212A1 (en) * | 1981-06-04 | 1982-12-23 | Aktiebolaget Bofors, 69180 Bofors | FILTER AND METHOD FOR THE PRODUCTION THEREOF |
US4376012A (en) * | 1979-04-12 | 1983-03-08 | Beloit Corporation | Method of forming a multi-ply web from paper stock |
US4376014A (en) * | 1979-04-12 | 1983-03-08 | Beloit Corporation | Headbox for forming multi-ply sheets |
US4414061A (en) * | 1975-02-20 | 1983-11-08 | Australian Paper Manufacturers Limited | Twin wire paper forming apparatus |
WO1984003112A1 (en) * | 1983-02-10 | 1984-08-16 | Scott Paper Co | Method and apparatus for producing paper and other nonwoven fibrous webs |
US4526653A (en) * | 1981-12-01 | 1985-07-02 | Kmw Aktiebolag | Control system for a multilayer headbox using an ultrasonic transducer |
US4539073A (en) * | 1981-12-01 | 1985-09-03 | Kmw Aktiebolag | Method and apparatus for measuring the size of a discharge slot in a headbox |
US4609435A (en) * | 1984-01-20 | 1986-09-02 | Valmet Oy | Process and equipment in the forming of paper web |
US4735686A (en) * | 1985-06-07 | 1988-04-05 | Valmet Oy | Twin-wire former and method for forming a paper web with steam implosion |
US4781793A (en) * | 1986-07-04 | 1988-11-01 | Valmet Oy | Method for improving paper properties in multiply paper using long and short fiber layers |
US4790909A (en) * | 1986-12-17 | 1988-12-13 | Beloit Corporation | Two-wire paper forming apparatus |
US4960492A (en) * | 1988-02-09 | 1990-10-02 | J.M. Voith Gmbh | Common wire path of a wet end section of a twin wire paper making machine |
US4961824A (en) * | 1984-05-11 | 1990-10-09 | Laitinen Leo S | Method for manufacturing multilayer board |
US5074966A (en) * | 1989-11-06 | 1991-12-24 | Valmet Paper Machinery Inc. | Gap former in a paper machine |
US5102501A (en) * | 1982-08-18 | 1992-04-07 | James River-Norwalk, Inc. | Multiple layer fibrous web products of enhanced bulk and method of manufacturing same |
US5204009A (en) * | 1991-08-14 | 1993-04-20 | Kvaerner Hymac Inc. | Slurry rising apparatus and method therefor |
US5599427A (en) * | 1991-03-15 | 1997-02-04 | Valmet Corporation | Twin-wire web former in a paper machine |
US5609726A (en) * | 1993-06-28 | 1997-03-11 | J.M. Voith Gmbh | Headbox and method for producing multilayer and multi-ply paper webs |
US5868903A (en) * | 1994-10-14 | 1999-02-09 | Andritz-Patentverwaltungs-Gesellschaft M.B.H. | Device for dewatering and/or washing suspensions, in particular suspensions of fibrous materials |
US5916417A (en) * | 1997-08-22 | 1999-06-29 | International Paper Company | Method of making multi-ply paperboard sheet having layers of different fiber properties |
US6267846B1 (en) | 1998-01-30 | 2001-07-31 | Voith Sulzer Papiertechnik Patent Gmbh | Twin wire former and method of manufacturing a fibrous material web from a fibrous suspension using same |
US20040163788A1 (en) * | 2003-02-20 | 2004-08-26 | Daniel Filion | Headbox sealing device |
CN117759196A (en) * | 2024-02-22 | 2024-03-26 | 山东省地质矿产勘查开发局第七地质大队(山东省第七地质矿产勘查院) | exploration hole layering pumping test seals and separates sealing device |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI379674A (en) * | 1974-01-17 | 1975-07-18 | Beloit Corp | |
SE421328B (en) * | 1978-04-25 | 1981-12-14 | Karlstad Mekaniska Ab | PROCEDURE AND DEVICE FOR IMAGE OF A MULTILAYER MELT Beam |
DE3107926A1 (en) * | 1981-03-02 | 1982-11-04 | Escher Wyss Gmbh, 7980 Ravensburg | METHOD FOR FORMING A MULTILAYER PAPER SHEET IN A DOUBLE SCREEN FORM AND DOUBLE SCREEN FORM FOR IMPLEMENTING THE METHOD |
DE3815470A1 (en) * | 1988-05-06 | 1989-11-16 | Voith Gmbh J M | DOUBLE SCREEN SHAPER |
DE19941676A1 (en) * | 1999-09-01 | 2001-03-08 | Voith Paper Patent Gmbh | Device for dewatering a substance-water mixture |
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US1018588A (en) * | 1910-11-07 | 1912-02-27 | John B Shepler | Multiple-ply-paper-board-making machine. |
US1718574A (en) * | 1925-05-11 | 1929-06-25 | William H Millspaugh | Paper-making method and machine |
US1782214A (en) * | 1928-09-06 | 1930-11-18 | Albert D Stewart | Process and apparatus for producing felted fibrous board |
US1875075A (en) * | 1930-01-25 | 1932-08-30 | Masonite Corp | Liquid separation |
US2098733A (en) * | 1937-09-20 | 1937-11-09 | Hummel Ross Fibre Corp | Plyboard |
CA565496A (en) * | 1958-11-04 | R. Webster David | Adjustable slice for a paper machine | |
US2881668A (en) * | 1956-03-30 | 1959-04-14 | St Annes Board Mill Co Ltd | Paper forming section |
US2911039A (en) * | 1957-01-18 | 1959-11-03 | Beloit Iron Works | Paper machine forming section |
US2928464A (en) * | 1957-01-01 | 1960-03-15 | Albert E Reed And Company Ltd | Adjustable slice for flow box |
DE1904962A1 (en) * | 1969-02-01 | 1970-08-20 | Arledter Dr Ing Hanns F | Twin-screen paper machine |
US3607625A (en) * | 1968-01-17 | 1971-09-21 | Beloit Corp | Headbox |
US3619362A (en) * | 1969-02-03 | 1971-11-09 | Beloit Corp | Papermaking headbox stock nozzle with liquid jacket means for elimination of stock exposure to air |
-
1972
- 1972-06-08 US US00260808A patent/US3839143A/en not_active Expired - Lifetime
-
1973
- 1973-05-22 GB GB2433373A patent/GB1418057A/en not_active Expired
- 1973-05-28 AR AR248241A patent/AR196668A1/en active
- 1973-05-29 BE BE131637A patent/BE800178A/en unknown
- 1973-05-29 ZA ZA733652A patent/ZA733652B/en unknown
- 1973-05-29 FI FI1724/73A patent/FI61217C/en active
- 1973-06-01 JP JP7360981A patent/JPS5214331B2/ja not_active Expired
- 1973-06-01 SE SE7307778A patent/SE397549B/en unknown
- 1973-06-04 ES ES415529A patent/ES415529A1/en not_active Expired
- 1973-06-05 NL NL7307840A patent/NL7307840A/xx unknown
- 1973-06-06 FR FR7321562A patent/FR2187990B1/fr not_active Expired
- 1973-06-06 BR BR4215/73A patent/BR7304215D0/en unknown
- 1973-06-07 CA CA173,507A patent/CA971407A/en not_active Expired
- 1973-06-08 AU AU56736/73A patent/AU5673673A/en not_active Expired
- 1973-06-09 DE DE2329658A patent/DE2329658C3/en not_active Expired
- 1973-06-12 IT IT25192/73A patent/IT990621B/en active
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CA565496A (en) * | 1958-11-04 | R. Webster David | Adjustable slice for a paper machine | |
US1018588A (en) * | 1910-11-07 | 1912-02-27 | John B Shepler | Multiple-ply-paper-board-making machine. |
US1718574A (en) * | 1925-05-11 | 1929-06-25 | William H Millspaugh | Paper-making method and machine |
US1782214A (en) * | 1928-09-06 | 1930-11-18 | Albert D Stewart | Process and apparatus for producing felted fibrous board |
US1875075A (en) * | 1930-01-25 | 1932-08-30 | Masonite Corp | Liquid separation |
US2098733A (en) * | 1937-09-20 | 1937-11-09 | Hummel Ross Fibre Corp | Plyboard |
US2881668A (en) * | 1956-03-30 | 1959-04-14 | St Annes Board Mill Co Ltd | Paper forming section |
US2928464A (en) * | 1957-01-01 | 1960-03-15 | Albert E Reed And Company Ltd | Adjustable slice for flow box |
US2911039A (en) * | 1957-01-18 | 1959-11-03 | Beloit Iron Works | Paper machine forming section |
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Cited By (36)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3970514A (en) * | 1974-02-15 | 1976-07-20 | Oy Tampella Ab | Combination-paper machine |
US3944464A (en) * | 1974-05-10 | 1976-03-16 | International Paper Company | Forming section for twin-wire papermaking machine |
US4414061A (en) * | 1975-02-20 | 1983-11-08 | Australian Paper Manufacturers Limited | Twin wire paper forming apparatus |
US4021295A (en) * | 1975-05-05 | 1977-05-03 | Beloit Corporation | Method and apparatus for supplying white water from a single silo in the formation of a multi-ply web |
US4036684A (en) * | 1975-08-04 | 1977-07-19 | Beloit Corporation | High bulk tissue forming and drying apparatus |
US4113557A (en) * | 1976-04-14 | 1978-09-12 | Valmet Oy | Paper manufacturing structure particularly for detaching a web from a wire |
DE2732361A1 (en) * | 1976-07-16 | 1978-01-26 | Beloit Corp | CONTROL DEVICE FOR A REFUGEER WITH MULTIPLE CHANNELS FOR A PAPER MACHINE FOR THE PRODUCTION OF MULTI-LAYERED PAPER WEB |
US4125428A (en) * | 1977-06-27 | 1978-11-14 | The Black Clawson Company | Vertical twin wire paper machine |
DE2824608A1 (en) * | 1977-07-13 | 1979-01-25 | Tampella Oy Ab | FEEDING APPARATUS IN A WEB FORMING MACHINE FOR THE PRODUCTION OF A TWO- OR MULTI-LAYER FIBER WEB |
US4376012A (en) * | 1979-04-12 | 1983-03-08 | Beloit Corporation | Method of forming a multi-ply web from paper stock |
US4376014A (en) * | 1979-04-12 | 1983-03-08 | Beloit Corporation | Headbox for forming multi-ply sheets |
WO1981002903A1 (en) * | 1980-04-11 | 1981-10-15 | Valmet Oy | Headbox for a paper machine |
DE3221212A1 (en) * | 1981-06-04 | 1982-12-23 | Aktiebolaget Bofors, 69180 Bofors | FILTER AND METHOD FOR THE PRODUCTION THEREOF |
US4431542A (en) * | 1981-06-04 | 1984-02-14 | Aktiebolaget Bofors | Filter and method of producing the same |
US4526653A (en) * | 1981-12-01 | 1985-07-02 | Kmw Aktiebolag | Control system for a multilayer headbox using an ultrasonic transducer |
US4539073A (en) * | 1981-12-01 | 1985-09-03 | Kmw Aktiebolag | Method and apparatus for measuring the size of a discharge slot in a headbox |
US5102501A (en) * | 1982-08-18 | 1992-04-07 | James River-Norwalk, Inc. | Multiple layer fibrous web products of enhanced bulk and method of manufacturing same |
WO1984003112A1 (en) * | 1983-02-10 | 1984-08-16 | Scott Paper Co | Method and apparatus for producing paper and other nonwoven fibrous webs |
US4609435A (en) * | 1984-01-20 | 1986-09-02 | Valmet Oy | Process and equipment in the forming of paper web |
US4961824A (en) * | 1984-05-11 | 1990-10-09 | Laitinen Leo S | Method for manufacturing multilayer board |
US4735686A (en) * | 1985-06-07 | 1988-04-05 | Valmet Oy | Twin-wire former and method for forming a paper web with steam implosion |
US4781793A (en) * | 1986-07-04 | 1988-11-01 | Valmet Oy | Method for improving paper properties in multiply paper using long and short fiber layers |
US4790909A (en) * | 1986-12-17 | 1988-12-13 | Beloit Corporation | Two-wire paper forming apparatus |
US4960492A (en) * | 1988-02-09 | 1990-10-02 | J.M. Voith Gmbh | Common wire path of a wet end section of a twin wire paper making machine |
US5074966A (en) * | 1989-11-06 | 1991-12-24 | Valmet Paper Machinery Inc. | Gap former in a paper machine |
US5599427A (en) * | 1991-03-15 | 1997-02-04 | Valmet Corporation | Twin-wire web former in a paper machine |
US5204009A (en) * | 1991-08-14 | 1993-04-20 | Kvaerner Hymac Inc. | Slurry rising apparatus and method therefor |
US5609726A (en) * | 1993-06-28 | 1997-03-11 | J.M. Voith Gmbh | Headbox and method for producing multilayer and multi-ply paper webs |
US5868903A (en) * | 1994-10-14 | 1999-02-09 | Andritz-Patentverwaltungs-Gesellschaft M.B.H. | Device for dewatering and/or washing suspensions, in particular suspensions of fibrous materials |
US5916417A (en) * | 1997-08-22 | 1999-06-29 | International Paper Company | Method of making multi-ply paperboard sheet having layers of different fiber properties |
US6068732A (en) * | 1997-08-22 | 2000-05-30 | International Paper Company | Multi-ply paperboard with improved stiffness |
US6267846B1 (en) | 1998-01-30 | 2001-07-31 | Voith Sulzer Papiertechnik Patent Gmbh | Twin wire former and method of manufacturing a fibrous material web from a fibrous suspension using same |
US20040163788A1 (en) * | 2003-02-20 | 2004-08-26 | Daniel Filion | Headbox sealing device |
US6821392B2 (en) | 2003-02-20 | 2004-11-23 | Metso Paper, Inc. | Headbox sealing device |
CN117759196A (en) * | 2024-02-22 | 2024-03-26 | 山东省地质矿产勘查开发局第七地质大队(山东省第七地质矿产勘查院) | exploration hole layering pumping test seals and separates sealing device |
CN117759196B (en) * | 2024-02-22 | 2024-05-03 | 山东省地质矿产勘查开发局第七地质大队(山东省第七地质矿产勘查院) | Exploration hole layering pumping test seals and separates sealing device |
Also Published As
Publication number | Publication date |
---|---|
SE397549B (en) | 1977-11-07 |
NL7307840A (en) | 1973-12-11 |
DE2329658B2 (en) | 1979-08-30 |
GB1418057A (en) | 1975-12-17 |
DE2329658A1 (en) | 1974-01-03 |
BE800178A (en) | 1973-09-17 |
JPS5214331B2 (en) | 1977-04-21 |
FI61217B (en) | 1982-02-26 |
DE2329658C3 (en) | 1980-05-08 |
AU5673673A (en) | 1974-12-12 |
FI61217C (en) | 1982-06-10 |
FR2187990B1 (en) | 1979-07-27 |
ES415529A1 (en) | 1976-02-16 |
ZA733652B (en) | 1974-04-24 |
FR2187990A1 (en) | 1974-01-18 |
JPS4948914A (en) | 1974-05-11 |
BR7304215D0 (en) | 1974-07-18 |
CA971407A (en) | 1975-07-22 |
IT990621B (en) | 1975-07-10 |
AR196668A1 (en) | 1974-02-12 |
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