EP3423627A1 - Rundsiebpapiermaschine - Google Patents
RundsiebpapiermaschineInfo
- Publication number
- EP3423627A1 EP3423627A1 EP17706774.1A EP17706774A EP3423627A1 EP 3423627 A1 EP3423627 A1 EP 3423627A1 EP 17706774 A EP17706774 A EP 17706774A EP 3423627 A1 EP3423627 A1 EP 3423627A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- trough
- suspension
- paper machine
- machine according
- inlet
- 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.)
- Granted
Links
- 239000000725 suspension Substances 0.000 claims abstract description 64
- 238000007789 sealing Methods 0.000 claims description 5
- 238000003860 storage Methods 0.000 claims description 4
- 230000006978 adaptation Effects 0.000 claims description 2
- 230000002706 hydrostatic effect Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract 1
- 239000000123 paper Substances 0.000 description 29
- 239000000835 fiber Substances 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000006073 displacement reaction Methods 0.000 description 5
- 230000007704 transition Effects 0.000 description 5
- 239000006260 foam Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000011111 cardboard Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004049 embossing Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000005087 leaf formation Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 239000011087 paperboard Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- 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
- D21F9/04—Complete machines for making continuous webs of paper of the cylinder type
- D21F9/043—Complete machines for making continuous webs of paper of the cylinder type with immersed cylinder
-
- 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
- D21F1/04—Head boxes of cylinder machines
- D21F1/043—Head boxes of cylinder machines with immersed cylinders
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
- D21F11/06—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the cylinder type
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/20—Methods of refining
- D21D1/40—Washing the fibres
Definitions
- the invention relates to a paper machine for the production of paper or
- the apparatus having a machine width
- Pulp suspension inlet, a trough with a rotating DC circular sieve, a trough inlet and a Vliesab fortunevoriques has.
- Pulp suspension in the trough to the point at which the screen cylinder forms a channel with the sieve tray.
- the course of the flow is essentially determined by the open surface of the trough.
- Negative velocity gradients that is, delays in the flow velocity, disadvantageously arise in the trough feed, although reverse flow or standing suspensions may also occur. Such areas adversely affect the flocculation state of the suspension and thus also the formation of the
- the aim of the present invention is to improve the flow conditions in the trough so that no negative velocity gradients, no backflows or dead zones between the flow entering the trough and the transition into the channel, formed from trough and round screen arise. Furthermore, the invention allows an adaptation of the speed at the transition into the channel independently of
- Fig. 1 shows schematically a section through a paper machine according to the prior art.
- Fig. 2 shows schematically the section through a first embodiment according to the invention
- Fig. 2a shows a modified embodiment
- Fig. 3 shows in partial section a detail.
- Fig. 4 shows a plan view of this detail.
- Fig. 5 shows a third embodiment.
- Fig. 6 shows another embodiment with associated control scheme and Fig. 7 shows an embodiment with adjustable overflow bar.
- Fig. 1 shows a paper machine according to the prior art.
- the paper machine essentially comprises a trough 1 with a round screen 2 running therein with the direction of rotation 3.
- the suspension Via a pulp suspension inlet 4, the suspension, which consists essentially of water, paper fibers and various additives, via the cross-flow distributor 5, a turbo liner 6 and the inlet nozzle 7 out in the trough inlet 8 and passes from there via the trough channel inlet 9 in
- Trough channel outlet 12 can be changed by adjusting the position of the Rundsiebachse 13.
- the direction of rotation 3 of the round screen 2 and the flow direction 10 of the pulp suspension is rectified.
- the difference in pressure caused by the difference in height causes the flow of the liquid constituent of the suspension into the interior of the round screen and the corresponding deposition of a fibrous web on the surface of the round screen.
- the nonwoven fabric is from a nonwoven removal device 14th
- the couch roll 15 is preceded in this embodiment, a so-called Eisseur 17, which serves to equalize the leaf formation.
- Eisseur 17 By embossing or other watermark inserts on the round screen 2 watermarks can be provided.
- Residual suspension which flows over the trough channel outlet 12, can be withdrawn via the outlet 18 and recycled. It should be noted that the suspension mirror A1 in the trough inlet 8 in its altitude by the diameter of the round screen 2 and the position of the couch roll 15th
- Fig. 2 shows a simplified example of a paper machine according to the invention, wherein like reference numerals have the same meaning. There are only the machine parts essential for the present invention shown, so that the devices such as couch roll 15, Vliesab fortunevoriques 14 and Eisseur 17 are not shown, but can be arranged the same as in Fig. 1.
- the trough inlet 8 has a flow-guiding device 20. This comprises a fluid level covering and the suspension flow
- the cover 19 comprises a rigid upper lip 21 bent downwards at the end, and subsequently a flexible skirt 22, which is arranged or can be arranged adjacent to the round screen 2.
- This flow guide extends over the entire length of the round screen 2, as far as it is acted upon by the pulp suspension and is sealed to the end wall of the trough.
- the angular position of the cover 19 to the inflow into the channel 1 1 is adjustable and changeable by a hinge 23.
- the position of the skirt 22 on the upper lip 21 is adjustable by a locking device 24. By this adjustment, the pulp suspension feed 4 to the other
- Moving plate 25 attached which is displaceable and attached to the tray inlet to adjust the distance to the round screen 2 can. With the displaceability of the skirt 22 relative to the upper lip 21, it is also possible to adjust the apron protrusion.
- the apron is attracted by the round screen by the pressure difference between the pressure inside the round screen 2 and the pressure in the tray inlet 9, whereby the sealing effect is created. Due to the lateral sealing of the upper lip 21 and the skirt 22 to the side trough wall is, by from the upper lip 21 (with skirt 22) and cylinder molds formed Rundsieb-apron gusset 41, no
- Attachment point of the skirt 22 to be designed so that the outlet tangent of the skirt 22 comes to lie on the cylinder mold at a desired point above the rigid end point of the upper lip 21. This can be done by a attached to the upper lip 21 contour body 42, as shown in Fig. 2a.
- the contoured body 42 may be interchangeable to provide different contours.
- the upper contour of the upper lip 21 ensures that, despite the laying of the attachment point (locking device 24), a sufficient gusset is formed. This gusset is required for the introduction of so-called window threads.
- Point of support of the thread is therefore in the gusset in front of the window threads
- Thread guide 26 is shown in detail in the figure of Fig. 2a.
- Fig. 2 and Fig. 2a is also the arrangement of a guide tube 26th
- Embed plastic security thread in the fibrous web to be formed Embed plastic security thread in the fibrous web to be formed.
- the arrangement of the guide tube or a juxtaposed series of such guide tubes will be described with reference to FIG. 3.
- FIG 3 and 4 show this arrangement of the guide tube 26, which is fastened in this embodiment, for example only in a ball joint 27, whereby the position of the guide tube 26 is adjustable.
- the ball joint 27 is mounted in a sealing plate 28 which is displaceable in the horizontal direction to allow the lateral adjustment (transverse to the web) of the position of the guide tube 26.
- a guide tube 26 are attached to the upper lip 21.
- the guide tubes 26 can also be oscillated via an external drive, if such an offset of the securing thread of ⁇ 2 mm to ⁇ 15 mm in the paper web is desired.
- the pivot joint 23 and the displacement plate 25 is still shown, which is fastened on a machine-fixed construction element 29 in a corresponding displacement position.
- Fig. 5 shows a further embodiment in which in the trough inlet 8 and the cover 19 upstream of a suspension storage box 30 is arranged.
- this suspension box 30 By arranging this suspension box 30, the hydrostatic pressure, which corresponds to the dewatering pressure through the screen, can be increased, which is formed by the difference to the suspension level A3 in the suspension stowage box 30 and the suspension mirror A2 set in the interior of the round screen.
- the suspension stowage box 30 is up to form an air cushion 31
- Suspension level a supply and discharge 32 may be provided.
- the level is generated solely by the pump pressure.
- the lowest possible “level” corresponds to the highest point of the upper lip.
- the pulp suspension feed from the crossflow distributor 5 is guided via a perforated plate 33 into a settling chamber 34. Furthermore, the pulp suspension flows through a turbulence insert 6, so that the most uniform flow profile is generated in the trough channel inlet 9 a to achieve balanced velocity profile and pulp concentration over the entire cross section.
- Fig. 6 the scheme of another embodiment variant with associated control and line devices is shown.
- the pulp suspension passes through the cross-flow distributor 5 through a first turbulence insert 34 in the suspension stowage box 30, and a second turbulence insert 35 in the trough inlet 8.
- the pressure in the air cushion 31 can be controlled via an air pressure source 36 and associated control valves 37.
- a control bypass 38 which cooperates with the white water tank and the foam overflow 40 for the feed quantity of the pulp suspension.
- Fig. 7 shows schematically the view in the direction of the round screen axis 13.
- the round screen 2 is adjustable in its position within the trough 1, whereby the geometry of the flow channel is adjustable.
- the trough 1 has at the outlet 18 a
- Suspension level A4 in the course of determining or largely influencing overflow strip 44.
- the position of the overflow strip 44 is adjustable both in height, as well as in their distance from the round screen 2.
- This adjustability of the overflow allows or facilitates on the one hand the removal and installation of the round screen in the trough and on the other hand determines the position of the overflow strip 44, the suspension mirror A4 and thus the pressure ratio in the round screen.
- the adjustment is made by the adjusting member 47 and the pivot 46.
- the height of the position of the overflow strip is made by moving according to arrow 48th
- the air cushion pressure can be controlled by the supply and discharge line 32 for air.
- the displacement plate 25 has to adjust the position of the upper lip 21 with your skirt 22 on a sliding gear 43, whereby the position of the upper lip 21 and skirt 22 can be adjusted or changed.
- guide tube 26 can be connected to a water or air pressure device in order to be able to shoot the thread down to the round screen at the beginning of the papermaking process.
- FIGS. 2 to 7 each show modified structural elements, the arrangement of which is not limited to the specific illustrations in the figures, but the features and construction details in all embodiments may be provided or omitted.
- Stagnation level coincide approximately with the upper edge of the inlet cross-section. If the level is significantly above this point, there is an unfavorable delay of the pulp suspension when entering the trough. If the suspension level is below, there is also inadmissible turbulence.
- the suspension wetted circumference of the cylinder should represent a maximum.
- the water level is influenced by the height of the overflow edge at the outlet. In practice, the inflow at the given stowage level in the trough is dependent on:
- the described invention is firstly based on the problem that
- Apron is variable in length. It can either be directly connected to the end of the upper lip or mounted anywhere on the lip top and hanging it over the lip end.
- the upper lip is horizontally and vertically adjustable to ensure an optimal nozzle geometry, depending on the cylinder diameter.
- the lip has a swivel joint on the inlet side with a horizontal adjustment and optimally a vertical adjustment.
- the cylinder is horizontally displaceable in the trough as in the prior art.
- the upper lip has a guide tube passage.
- Each guide tube is individually adjustable to ensure the desired position in the paper.
- the guide tube has in the sealed
- the invention is also based on the problem that the speed on
- Transition into the channel with open DC round sieve can not be influenced independently of the geodetic level of the suspension.
- the flow from the inlet to the nozzle to the transition into the channel should have an undisturbed and continuously accelerated flow profile, it is also crucial to keep the velocity in the channel approximately in a constant relationship to the speed.
- the discharge speed is determined by a speed-controlled pump; So she works hydraulically.
- the suspension level above the nozzle end is level-controlled and has the same height at all speeds.
- the discharge speed and the associated damming height are achieved by an air cushion and automatically controlled. At slow speeds, when the fixed suspension level exceeds the required damming height, the air cushion is also automatically controlled in the vacuum area. This allows the headbox also at
Landscapes
- Paper (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT501492016 | 2016-02-29 | ||
ATA50308/2016A AT518294B1 (de) | 2016-02-29 | 2016-04-12 | Papiermaschine |
PCT/EP2017/054118 WO2017148780A1 (de) | 2016-02-29 | 2017-02-23 | Rundsiebpapiermaschine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3423627A1 true EP3423627A1 (de) | 2019-01-09 |
EP3423627B1 EP3423627B1 (de) | 2019-11-20 |
Family
ID=59849991
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17706774.1A Active EP3423627B1 (de) | 2016-02-29 | 2017-02-23 | Rundsiebpapiermaschine |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP3423627B1 (de) |
AT (1) | AT518294B1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114688055A (zh) * | 2022-03-28 | 2022-07-01 | 陕西科技大学 | 高压风机鼓风的气垫式流浆箱空气流量控制系统 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1746434A (en) * | 1928-03-28 | 1930-02-11 | Lowe Charles | Deckle |
AT388948B (de) * | 1986-11-27 | 1989-09-25 | Voith Gmbh J M | Stoffauflauf fuer papiermaschinen od.dgl. |
-
2016
- 2016-04-12 AT ATA50308/2016A patent/AT518294B1/de not_active IP Right Cessation
-
2017
- 2017-02-23 EP EP17706774.1A patent/EP3423627B1/de active Active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114688055A (zh) * | 2022-03-28 | 2022-07-01 | 陕西科技大学 | 高压风机鼓风的气垫式流浆箱空气流量控制系统 |
Also Published As
Publication number | Publication date |
---|---|
AT518294A1 (de) | 2017-09-15 |
EP3423627B1 (de) | 2019-11-20 |
AT518294B1 (de) | 2018-01-15 |
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