CN212247653U - Suction box of fiber web machine and fiber web machine - Google Patents
Suction box of fiber web machine and fiber web machine Download PDFInfo
- Publication number
- CN212247653U CN212247653U CN202020526923.1U CN202020526923U CN212247653U CN 212247653 U CN212247653 U CN 212247653U CN 202020526923 U CN202020526923 U CN 202020526923U CN 212247653 U CN212247653 U CN 212247653U
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- China
- Prior art keywords
- channel
- dewatering
- suction box
- fiber web
- web machine
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- 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
- D21F1/52—Suction boxes without rolls
-
- 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
- D21F1/483—Drainage foils and bars
- D21F1/486—Drainage foils and bars adjustable
-
- 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
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Abstract
The utility model relates to a fiber web machine's suction box and fiber web machine, wherein suction box (100) includes: a dewatering chamber (120) in communication with the vacuum generating device; a dewatering element (130) located at a side of the dewatering chamber (120) close to the fibrous web; -a channel (110) having a first end (115) and a second end (116), the first end (115) of the channel communicating with the dewatering element (130) and the second end (116) of the channel communicating with the dewatering chamber (120), wherein the channel (110) comprises an adjustment mechanism for adjusting the working length of the channel between the dewatering element (130) and the dewatering chamber (120). Through the utility model discloses a suction box, when the fibre web needs lower dehydration rate to high-speed fibre web machine, also can guarantee going on of normal production and maintaining the ascending vacuum of cross-machine direction stable.
Description
Technical Field
The present invention relates to a suction box of a fiber web machine, in particular for a fiber web machine of the pulp and paper industry, and in particular for a forming section of a fiber web machine. The invention also relates to a fiber web machine comprising such a suction box.
Background
Suction boxes, also known as dewatering boxes, suction boxes and the like, are widely used in many process sections in the pulp and paper industry, for assisting the dewatering of a fibre web, a blanket or wet sheet of paper or the like, and for holding the fibre web on a supporting fabric so that the fibre web and the supporting fabric can be advanced together to the next process or the like.
At the forming section of the fiber web machine, it is also necessary to use suction boxes, where the suction boxes are mainly used for dewatering the fiber web. In practical production applications, the width (i.e. the dimension in the cross-machine direction) of modern high-speed paper machines can be as long as about 6 to 12 meters, and therefore, how to uniformly dewater the fiber web and simultaneously ensure that the fibers are uniformly retained on the supporting fabric in the cross-machine direction so as to form a paper web with uniform thickness is a key problem to be solved in the field.
Existing suction boxes usually comprise a dewatering chamber which communicates via a channel with a dewatering element near the fibre web to be dewatered and which is connected to a vacuum generating device for generating underpressure. The suction box draws water from the fibre web into the dewatering chamber by means of the underpressure created in the dewatering chamber. In existing top suction boxes for forming sections, the channel has a fixed channel length (the channel is usually vertical when the top suction box is used, and hence the "channel length" is also often referred to in the art as "channel height") which is determined by the maximum dewatering rate required for the fibre web. Thus, the suction box is to be able to meet the dewatering capacity requirements when a larger dewatering rate of the fibre web is required.
However, in an actual production process, the dewatering rates required for different types, different processes, different moisture content of the fibre web are not the same, and most of the time the maximum dewatering capacity is not required. Therefore, in case a lower dewatering rate is required, the vacuum suction experienced at the surface of the fibre web needs to be reduced. During operation of the suction box, the vacuum suction experienced at the surface of the fibre web is the sum of the vacuum in the dewatering chamber and the hydrostatic pressure created by the length of the channel. With a fixed channel length as in the prior art, the vacuum suction experienced at the surface of the fibre web can only be reduced by reducing the vacuum in the dewatering chamber. In practice, however, reducing the vacuum in the dewatering chamber is not an optimal solution in situations where a lower dewatering rate of the fibre web is required. Since a lower suction force resulting from a lower vacuum in the dewatering chamber in case of a need for a lower dewatering rate leads to an instable vacuum in the cross-machine direction at the surface of the fibre web, which may cause the fibre web to be formed with a varying thickness in the cross-machine direction and may even cause breakage of the fibre web.
Therefore, there is a need for a suction box for a fiber web machine that, while meeting the maximum dewatering capacity requirements of the fiber web, maintains a stable vacuum in the cross-machine direction when a lower dewatering rate is required for the fiber web, so that a uniform dewatering of the fiber web is ensured while the fiber web remains uniformly on the supporting fabric in the cross-machine direction.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a suction box of fiber web material machine, it can satisfy the demand that the fiber web material needs lower dehydration rate simultaneously under the prerequisite that satisfies the biggest dehydration requirement of fiber web material, and then solves one of the above-mentioned problems that exist among the prior art at least.
To achieve the above object, the present invention provides a suction box of a fiber web machine, comprising: the dehydration chamber is communicated with the vacuum generating device; a dewatering element located at a side of the dewatering chamber close to the fibrous web; a channel having a first end and a second end, the first end of the channel communicating with the dewatering element and the second end of the channel communicating with the dewatering chamber, wherein the channel comprises an adjustment mechanism for adjusting the working length of the channel between the dewatering element and the dewatering chamber.
Preferably, the adjustment mechanism comprises: an opening opened in a wall of the channel between the first end and the second end; and a rotatable shutter provided on a wall of the passage at a position corresponding to the opening to close or open the opening.
Preferably, the flap is connected to the wall of the channel by a hinge and can be pivoted relative to the wall of the channel by means of the hinge.
Preferably, when a lower dewatering rate is required for the web, the flap can be in an open position, so that the channel communicates the dewatering element with the dewatering chamber via the first end and the opening, obtaining a working length; when a higher dewatering rate is required for the web, the flap can be in a closed position, so that the channel communicates the dewatering element with the dewatering chamber via the first end and the second end, obtaining another working length; the one working length is shorter than the other working length.
Preferably, the channel comprises a plurality of said adjustment mechanisms, which are distributed at intervals on the wall between the first and second ends along the extension direction of the channel, and one of which can be selectively opened.
Preferably, the adjustment mechanism comprises: a slot opening in a wall of the channel at the second end; and a strip mounted on a wall of the channel and fixed in correspondence with the notch in a position close to the first end, as a detachable wall that obstructs at least part of the notch.
Preferably, the length of the strip is manually selectable, the relatively short strip making the working length of the channel relatively short compared to a relatively long strip.
Preferably, the adjustment mechanism further comprises: an auxiliary member for selective mounting is disposed within the slot on a side of the strip remote from the first end, a spaced opening is formed between the auxiliary member and the strip such that the passage communicates the dewatering element with the dewatering chamber via the first end and the spaced opening.
Preferably, the bar is slidably mounted to or removed from the wall of the channel by means of a dovetail slot fit.
The utility model discloses still provide a fiber web machine, its suction box that includes aforementioned fiber web machine.
The utility model discloses a suction box of fiber web material machine has following beneficial technological effect: on the basis of meeting the maximum dewatering requirement of the fiber web, when the fiber web needs a lower dewatering speed, unstable vacuum degree can not be generated in the cross direction of the machine, so that the fiber web can be uniformly dewatered and simultaneously uniformly retained on a supporting fabric in the cross direction of the machine to form the fiber web with uniform thickness.
Drawings
The various objects, features and advantages of the present invention will become more apparent from the following detailed description of the preferred embodiments of the invention, when considered in conjunction with the accompanying drawings. The drawings are merely exemplary of the invention and are not necessarily drawn to scale. In the drawings, like reference characters designate the same or similar parts throughout the different views. Wherein:
fig. 1 shows a forming section of a fiber web machine using a suction box of prior art.
Fig. 2A and 2B respectively show schematic diagrams of a suction box according to an embodiment of the present invention in different operating states.
Figure 3A shows a schematic view of a suction box according to another embodiment of the present invention.
Figure 3B shows a schematic view of a suction box according to yet another embodiment of the present invention.
Description of reference numerals:
1 headbox
10 top net unit
100 suction box
100' suction box of the prior art
110 channel
110' passage of suction box of prior art
111 baffle plate
112 hinge
113 Bar
114 auxiliary member
115 first end
116 second end
117 opening
118 notch
119 space port
120 dehydration chamber
130 dewatering element
20 bottom net unit
21 breast roll
22 dewatering box
30 draw paper felt
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of relevant embodiments of the invention and are not limiting of the invention. It should be noted that, for convenience of description, only the parts related to the present invention are shown in the drawings.
Fig. 1 shows a forming section of a fiber web machine using a suction box of prior art. The forming section comprises a headbox 1, a top wire unit 10 and a bottom wire unit 20. Wherein the top wire unit 10 comprises a top suction box 100'. The bottom wire unit 20 comprises a breast roll 21, a dewatering box 22 etc. In addition, the drawing also shows a draw felt 30 and the corresponding rollers in broken lines. During the formation of the fibre web, the stock is supplied to the bottom wire unit 20 by means of the headbox 1, whereafter some of the water is removed by several dewatering boxes 22 in order to form a fibre web, which continuously enters between the top wire unit 10 and the bottom wire unit 20, partly below the top suction box 100', by means of which the fibre web is further removed most of the water, and the finally formed fibre web is transported to the next process step adhering to the lower surface of the paper-guiding felt 30.
The internal structure of the top suction box 100 ' is also shown roughly in dotted lines in fig. 1, wherein the length of the channel 110 ' of the prior art suction box 100 ' is fixed, in other words, its length cannot be adjusted.
The utility model discloses aim at improving the passageway of suction box among the prior art. In particular, the invention provides for an adjusting mechanism to be arranged on the channel of the suction box for adjusting the working length of the channel between the dewatering element and the dewatering chamber. The "working length" in this context refers to the actual length of the channel section through which the moisture removed from the fibrous web passes. For a vertical channel, the "working length" can also be understood as the height of the actual working part of the channel. The utility model discloses utilize adjustment mechanism to realize the working length's of passageway change, can satisfy the different dehydration demands of fibre web under the condition of the vacuum in not changing the dehydration chamber from this, or only change the vacuum in the dehydration chamber less to also solve and can produce unstable vacuum scheduling problem on the machine horizontal when the fibre web needs lower dehydration rate. The suction box of the invention and its adjustment mechanism will be exemplified below.
Fig. 2A and 2B respectively show schematic diagrams of the suction box 100 in different operating states according to an embodiment of the present invention. Referring to fig. 2A, 2B, the suction box 100 includes a plurality of dewatering chambers 120, a plurality of dewatering elements 130, and a plurality of channels 110. The dehydrating chamber 120 is communicated with a vacuum generating device (not shown in the drawings) to generate a negative pressure. The dewatering element 130 is located on the side of the dewatering chamber 120 close to the fibre web, in the figures of the invention shown on the underside of the dewatering chamber 120. The channel 110 has a first end 115 (shown as a lower end) and a second end 116 (shown as an upper end). The first end 115 of the channel communicates with the dewatering element 130 and the second end 116 of the channel communicates with the dewatering chamber 120. The channel 110 is also provided with an adjustment mechanism for adjusting the working length of the channel between the dewatering element 130 and the dewatering chamber 120.
As shown in fig. 2A, the adjustment mechanism includes an opening 117 and a rotatable shutter 111. An opening 117 opens in the wall of the channel 110 between the first end 115 and the second end 116. A rotatable shutter 111 is also provided on the wall of the passage at a position corresponding to the opening 117 to close or open the opening 117. The flap 111 is connected to the wall of the channel 110 by a pivot assembly such as a hinge 112. By means of the hinge 112, the flap 111 is pivotable relative to the wall of the channel 110 between a position opening the opening 117 (as shown in fig. 2A) and a position closing the opening 117 (as shown in fig. 2B).
As shown in fig. 2A, when the shutter 111 is in the open position that opens the opening 117, the shutter 111 abuts against the channel wall on the opposite side of the opening 117. In operation, moisture in the fibrous web to be treated below the suction box 100 is sucked into the first end 115 of the channel 110 via the dewatering element 130 and flows upwards in the channel and finally is sucked into the dewatering chamber 120 through the opening 117. At this point, the length of the channel through which the pumped moisture passes is the length from the first end 115 of the channel 110 to the opening 117, which is referred to herein as the "working length" of the channel.
As shown in fig. 2B, the shutter 111 is in a closed position closing the opening 117. In operation, moisture in the fibrous web to be treated below the suction box 100 is sucked into the first end 115 of the channel 110 via the dewatering element 130 and flows upwards in the channel and finally is sucked into the dewatering chamber 120 through the second end 116 of the channel 110. The working length at this point is the distance between the first end 115 and the second end 116 of the channel 110. It is apparent that the working length of the channel in fig. 2A is shorter than the working length of the channel in fig. 2B.
In the embodiment of the present invention, the working length of the channel can be changed by adjusting the position of the baffle 111. Since the vacuum suction experienced at the surface of the fibre web is the sum of the vacuum in the dewatering chamber and the hydrostatic pressure created by the actual length of the channel, i.e. the working length, the vacuum suction experienced at the surface of the fibre web can be adjusted by changing the working length of the channel without changing the vacuum in the dewatering chamber, or with less change.
In particular, when a lower dewatering rate is required for the fibre web, the flap 111 is in the open position, so that the channel 110 communicates the dewatering element 130 with the dewatering chamber 120 via the first end 115 and the opening 117, obtaining a first working length; when a higher dewatering rate is required for the fibre web, the flap 111 is in the closed position, so that the channel 110 communicates the dewatering element 130 with the dewatering chamber 120 via the first end 115 and the second end 116, obtaining a second working length; in the embodiment shown in fig. 2A and 2B, the first working length is shorter than the second working length. Thereby, different dewatering demands of the fibre web can be met by changing the working length of the channel without changing the vacuum in the dewatering chamber or only slightly. The suction box of the invention can thus avoid the creation of unstable vacuum levels in the cross-machine direction when a lower dewatering rate is required for the fibre web.
Besides, the adjustment of the flap 111 is very simple, the pivoting of the flap 111 can be adjusted directly outside the suction box, so the suction box of this embodiment of the invention also has the advantage that the operator can adjust the position of the flap 111 during operation of the fiber web machine, and thus the working length of the channel, without stopping the machine during the adjustment.
Of course, the present invention is not so limited and one or more of the plurality of channels 110 may each include one or more adjustment mechanisms. For example, one channel 110 may include one, two, or more adjustment mechanisms. In one embodiment, each channel 110 in the suction box includes an adjustment mechanism. In one embodiment, one channel in the suction box includes one adjustment mechanism and the other channel includes a plurality of adjustment mechanisms. In one embodiment, each channel 110 includes a plurality of adjustment mechanisms. When the channel 110 comprises a plurality of adjustment means, the plurality of adjustment means are distributed at intervals along the extension of the channel in the wall between the first end 115 and the second end 116, and during production, one of the plurality of adjustment means in the channel can be selectively opened or all adjustment means can be selectively closed.
Figure 3A shows a schematic view of a suction box 100 according to another embodiment of the present invention; figure 3B shows a schematic view of a suction box according to yet another embodiment of the present invention. The suction box 100 shown in fig. 3A and 3B is substantially the same as the suction box 100 shown in fig. 2A and 2B, except for the adjustment mechanism. Referring to the embodiment shown in fig. 3A, the adjustment mechanism comprises: a notch 118 opening in the wall of the channel 110 at the second end 116; and a bar 113, the bar 113 being mounted on a wall of the channel 110 and fixed in correspondence with the notch 118 in a position close to the first end 115, as a removable wall that obstructs at least part of the notch 118. The bar 113 is slidably mounted to or removed from the wall of the channel 110 by means of a dovetail slot fit. Wherein the length of the bar 113 is manually selectable, in fig. 3A, a longer bar 113 is selected, and the working length of the channel 110 is the distance from the first end 115 of the channel 110 to the opening at the notch 118; whereas in the embodiment shown in fig. 3B, a relatively short bar 113 is selected, the working length of the channel 110 is the distance from the first end 115 of the channel 110 to the spacing port 119. The relatively short strip 113 of fig. 3B results in a relatively short working length of the channel 110 compared to the relatively long strip 113 of fig. 3A. Thus, the working length of the channel 110 may be varied. Furthermore, different dewatering demands of the fibre web can be met by changing the working length of the channel without changing the vacuum in the dewatering chamber or only slightly. That is, the suction box of the invention can avoid that an unstable vacuum is created in the cross-machine direction when a lower dewatering rate is needed for the fibre web.
In addition, referring to fig. 3B, when the shorter bar 113 is used, the adjusting mechanism may further optionally include an auxiliary member 114. The auxiliary member may be installed or not installed as desired. In particular, the auxiliary element 114 can be arranged in the slot 118, for example in a dovetail slot-fit manner or in any other removable manner, on the side remote from the first end 115 with respect to the strip 113, forming a spacing opening 119 between the auxiliary element 114 and the strip 113, so that the channel 110 communicates the dewatering element 130 with the dewatering chamber 120 via the first end 115 and the spacing opening 119. By means of the aid 114, the opening of the channel in communication with the dewatering chamber can be maintained at a desired size, even if shorter strips 113 are used, which helps to guide the water removed from the fibre web smoothly into the dewatering chamber for better dewatering stability.
In the embodiment shown in fig. 3A and 3B, the bar 113 and the auxiliary member 114 are easy to install and are easier to be implemented mechanically, but the working length of the channel can be changed during shutdown due to the need to disassemble and assemble the bar 113 and the auxiliary member.
Of course, the present invention is not limited thereto, and one or more of the plurality of channels 110 may include the above-described adjustment mechanism. The bars 113 may also be mounted to the channel walls in any removable manner other than a dovetail slot fit. For example, in one embodiment, the strips 113 may be removably secured to the channel walls by a snap fit.
The different embodiments of the adjustment mechanism described above may be applied in the channel 110 in any combination as desired.
The invention also relates to a fiber web machine comprising a suction box 100 according to any of the embodiments described above.
Although relative terms, such as "upper" and "lower," may be used in this specification to describe one element's relative relationship to another element, these terms are used in this specification for convenience only, e.g., in accordance with the orientation of the examples described in the figures. It will be appreciated that if the device of the icon were turned upside down, the element described as "upper" would become the element "lower". Other relative terms, such as "top," "bottom," "left," "right," and the like, are also intended to have similar meanings. When a structure is "on" another structure, it may mean that the structure is integrally formed with the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure via another structure.
In this specification, the terms "a", "an", "the", "said" and "at least one" are used to indicate the presence of one or more elements/components/etc.; the terms "comprising," "including," and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.; the terms "first," "second," and "third," etc. are used merely as labels, and are not limiting on the number of their objects.
It should be understood that while preferred embodiments have been illustrated and described, the invention is not limited to the particular embodiments described above, and that various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the appended claims. Therefore, it should be noted that various modifications and variations cannot be considered as beyond the technical spirit and scope of the utility model.
Claims (10)
1. Suction box (100) of a fiber web machine, characterized in that it comprises:
a dewatering chamber (120) in communication with the vacuum generating device;
a dewatering element (130) located at a side of the dewatering chamber (120) close to the fibrous web;
a channel (110) having a first end (115) and a second end (116), the first end (115) of the channel communicating with the dewatering element (130), the second end (116) of the channel communicating with the dewatering chamber (120),
wherein the passage (110) comprises an adjustment mechanism for adjusting the working length of the passage between the dewatering element (130) and the dewatering chamber (120).
2. A suction box (100) of a fiber web machine according to claim 1,
the adjustment mechanism includes: an opening (117) opening in a wall of the channel between the first end and the second end; and a rotatable shutter (111) provided on a wall of the passage at a position corresponding to the opening (117) to close or open the opening (117).
3. A suction box (100) of a fiber web machine according to claim 2,
the flap (111) is connected to the wall of the channel (110) by a hinge (112) and can be pivoted relative to the wall of the channel (110) by means of the hinge (112).
4. A suction box (100) of a fiber web machine according to claim 3,
when a lower dewatering rate is required for the web, the flap (111) can be in an open position to let the channel (110) communicate the dewatering element (130) with the dewatering chamber (120) via the first end (115) and the opening (117), obtaining a working length;
when a higher dewatering rate is required for the web, the flap (111) can be in a closed position to put the channel (110) into communication with the dewatering element (130) and the dewatering chamber (120) via the first end (115) and the second end (116), obtaining another working length;
the one working length is shorter than the other working length.
5. A suction box (100) of a fiber web machine according to claim 4,
the channel (110) comprises a plurality of said adjustment mechanisms, which are distributed at intervals on the wall between the first end (115) and the second end (116) along the extension direction of the channel, and one of which can be selectively opened.
6. A suction box (100) of a fiber web machine according to claim 1,
the adjustment mechanism includes: a slot (118) opening in a wall of the channel (110) at the second end (116); and a strip (113), said strip (113) being mounted on a wall of said channel (110) and being fixed in correspondence of said notch (118) in a position close to said first end (115) as a removable wall that obstructs at least a portion of said notch (118).
7. A suction box (100) of a fiber web machine according to claim 6,
the length of the strip (113) is manually selectable, the relatively short strip (113) causing the working length of the channel (110) to be relatively short compared to a relatively long strip (113).
8. A suction box (100) of a fiber web machine according to claim 7,
the adjustment mechanism further comprises: -an auxiliary element (114) for selective mounting, arranged in said notch (118), on the side remote from said first end (115) with respect to said strip (113), a spacing opening (119) being formed between said auxiliary element (114) and said strip (113), so that said passage (110) communicates said dewatering element (130) with said dewatering chamber (120) via said first end (115) and said spacing opening (119).
9. A suction box (100) of a fiber web machine according to claim 6,
the bar (113) is slidably mounted to or removed from the wall of the channel (110) by means of a dovetail slot fit.
10. A fiber web machine, characterized in that it comprises a suction box (100) of a fiber web machine according to any one of the preceding claims 1-9.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020526923.1U CN212247653U (en) | 2020-04-10 | 2020-04-10 | Suction box of fiber web machine and fiber web machine |
| ATGM50066/2021U AT17429U1 (en) | 2020-04-10 | 2021-04-07 | SUCTION BOX OF A FIBER WEB MACHINE AND FIBER WEB MACHINE |
| DE202021101827.5U DE202021101827U1 (en) | 2020-04-10 | 2021-04-07 | Suction box of a fiber web machine and fiber web machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020526923.1U CN212247653U (en) | 2020-04-10 | 2020-04-10 | Suction box of fiber web machine and fiber web machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212247653U true CN212247653U (en) | 2020-12-29 |
Family
ID=73984693
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020526923.1U Active CN212247653U (en) | 2020-04-10 | 2020-04-10 | Suction box of fiber web machine and fiber web machine |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN212247653U (en) |
| AT (1) | AT17429U1 (en) |
| DE (1) | DE202021101827U1 (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4335304C2 (en) * | 1993-10-16 | 1995-04-20 | Voith Gmbh J M | Method for operating a twin wire former |
| FI109814B (en) * | 2001-11-23 | 2002-10-15 | Vaahto Oy | Paper or cardboard web forming apparatus, has wire loop with dewatering box the bottom of which forms fraction line consisting of straight portions and edges between them, over which web between the two wires moves |
| DE102011003970A1 (en) * | 2011-02-11 | 2012-08-16 | Voith Patent Gmbh | A forming apparatus |
-
2020
- 2020-04-10 CN CN202020526923.1U patent/CN212247653U/en active Active
-
2021
- 2021-04-07 AT ATGM50066/2021U patent/AT17429U1/en unknown
- 2021-04-07 DE DE202021101827.5U patent/DE202021101827U1/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| DE202021101827U1 (en) | 2021-04-16 |
| AT17429U1 (en) | 2022-04-15 |
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