WO2000073032A9 - Tube filtre pour former a sec un materiau en bande - Google Patents

Tube filtre pour former a sec un materiau en bande

Info

Publication number
WO2000073032A9
WO2000073032A9 PCT/US2000/014631 US0014631W WO0073032A9 WO 2000073032 A9 WO2000073032 A9 WO 2000073032A9 US 0014631 W US0014631 W US 0014631W WO 0073032 A9 WO0073032 A9 WO 0073032A9
Authority
WO
WIPO (PCT)
Prior art keywords
groove
screen
screen pipe
edge
jacket
Prior art date
Application number
PCT/US2000/014631
Other languages
English (en)
Other versions
WO2000073032A1 (fr
Inventor
Paavo Hyvarinen
Heikki Niranen
Original Assignee
Bki Holding Corp
Paavo Hyvarinen
Heikki Niranen
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Bki Holding Corp, Paavo Hyvarinen, Heikki Niranen filed Critical Bki Holding Corp
Priority to KR1020017015088A priority Critical patent/KR20020047039A/ko
Priority to BR0011588-6A priority patent/BR0011588A/pt
Priority to JP2000621128A priority patent/JP2003521590A/ja
Priority to EP00937855A priority patent/EP1187708A1/fr
Priority to CA002374914A priority patent/CA2374914A1/fr
Priority to AU52976/00A priority patent/AU5297600A/en
Publication of WO2000073032A1 publication Critical patent/WO2000073032A1/fr
Priority to US09/988,897 priority patent/US6726461B2/en
Publication of WO2000073032A9 publication Critical patent/WO2000073032A9/fr

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/02—Straining or screening the pulp
    • D21D5/06—Rotary screen-drums
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing
    • B27N3/10—Moulding of mats
    • B27N3/14—Distributing or orienting the particles or fibres
    • B27N3/146—Controlling mat weight distribution

Definitions

  • the present invention relates to an apparatus which may be used for the rapid and even distribution of fibrous material onto a moving surface for the formation of web material.
  • wet- laying is a process by which a liquid suspension containing fibers to be inco ⁇ orated into a sheet is filtered through a sieve. The fibers in the liquid suspension are laid onto the sieve as the water passes through thereby creating the sheet. This process is most useful for the creation of thin, non-absorbent sheets such as paper.
  • Another well known process is dry- forming. This process involves the suspension of fibers ,which are to form a fibrous sheet, in air. These fibers are then laid onto a wire screen across which a vacuum is applied to draw the fibers onto the screen and hold them in place. This technology is particularly useful in the production of absorbent products.
  • the present invention embodies an apparatus to overcome this problem.
  • the invention relates to a screen pipe used in the dry forming of web material to distribute fiber material blown into the screen pipe through a jacket onto a wire screen arranged to move under the pipe.
  • the fiber material provided inside the screen pipe is made to rotate for example by means of a spiked roll placed inside the jacket, so that the movement of the fiber material has both a radial and a tangential component with respect to the jacket of the screen pipe.
  • the jacket includes, on its inner surface, profiled grooves extended axially along the pipe. The edges of the profiled groove with respect to the tangential component of the fiber flow are positioned at different angels to the tangential component.
  • the bottoms of the profiled grooves include holes or slots through which the fibers are discharged from the screen pipe.
  • a distribution unit where a screen pipe, as described above, can be used is known for example from Finnish Patent 66,948. This patent describes the basic structure of a distribution unit typically used in dry forming of sheet material.
  • the distribution unit generally called a former, comprises screen pipes, as described above, placed preferably in pairs to provide fiber flow in opposite directions over the wire in the cross direction thereof.
  • the primary reason for such positioning of the pipes is that, in practice, it is virtually impossible to ensure that fiber flow, which occurs only in one direction over the wire, is deposited evenly onto the wire in the cross direction, thus providing a uniform cross direction web profile.
  • screen pipes are placed in pairs so that the fiber flows in the pipes in opposite directions, a web's cross direction profile can be made considerably more uniform.
  • the variation in the web thickness in the cross direction thereof should be minimal.
  • An acceptable deviation from a target thickness is typically ⁇ 5%.
  • the basic structure of the distribution unit is useful and provides a high fiber discharge rate also with rather long fibers.
  • a screen pipe including, on its inner surface, axial profiled grooves wherein the edge of the groove that is located downstream of the tangential component of the fiber flow and the edge of the groove located upstream of the tangential component are at different angles to the tangential component is known for example from PCT application WO87/04474.
  • fiber material is caused to move by means of a rotor or a spiked roll placed axially inside the pipe.
  • the rotor or roll rotates in such a direction that the fibers whose movement it activates first come across the edge of the profiled groove which is at a more obtuse angle to the tangent of the jacket than the upstream edge of the groove.
  • This method produces microturbulence, which improves the flow of fibers through holes or slots provided in the screen pipe.
  • a primary problem with the aforementioned arrangement is the capacity at which fibers can be fed through the screen pipe.
  • the present invention overcomes the disadvantages of uneven fiber distribution and low fiber feed capacity.
  • the present invention relates to a screen pipe for the expulsion of fibrous material from said screen pipe including a cylindrical screen jacket which may rotate in a single given direction during its normal mode of operation, which includes the following elements on its inner surface:(a) one or more slots which completely penetrate the jacket through which the fibrous material may exit the apparatus; and (b) a groove located immediately downstream of the slot, relative to the direction of rotation of the screen jacket, wherein the edge of the groove which faces the adjacent slot forms an angle with the tangent of the screen jacket between 100° and 160°; and (c)a second groove located immediately upstream of the slot, relative to the direction of rotation of the screen jacket, wherein the edge of the groove which faces the slot forms an angle with the tangent of the screen jacket between 70° and 110°.
  • This screen pipe may further comprise a feed pipe, rotatable brush rollers and a blade wheel.
  • the edges of the grooves may also be substantially straight or curved.
  • the screen pipes of the invention may also be employed in oppositely oriented pairs for dry forming web material. Furthermore, the screen pipe may be operated such that the screen jacket is not rotated.
  • Figure 1 Basic structure of screen pipe as part of a distribution unit.
  • Figure 2 Partial cross-sectional view of a jacket of the screen pipe.
  • Figure 3 Shows a partial cross-sectional view of one embodiment of the inside surface of the jacket.
  • Figure 4 Shows a partial cross-sectional view of another embodiment of the jacket.
  • fibrous material refers to substantially individualized fibers.
  • Preferred fibers include natural and synthetic fibers, most preferably cellulose fibers.
  • a "slot" is a hole or any conveyance in the screen jacket of a screen pipe via which fibrous material is expelled.
  • a “wire” refers to a mesh structure onto which the fibrous material is deposited once expelled from the screen pipe.
  • a wire may be also have a vacuum placed across it so as to aid in the deposition of fibrous material upon it.
  • Figure 1 shows the basic structure of an exemplary distribution unit comprising a screen pipe 1 according to the invention. It shows two screen pipes 1 arranged to extend transversely across a wire (not shown in the figure).
  • the screen pipes 1 are arranged in a pair so that the flow directions A of the fiber material 3 in the pipes are opposite. This is achieved by blowing a fiber material flow 3 into the pipes via feed pipes 7 arranged at opposite ends of the screen pipes.
  • the feed pipes direct substantially axial flows of fiber material in an air-fluidized state into the screen pipes.
  • Screen jackets 2 may be arranged to be rotated around their axes in the direction denoted by arrow B.
  • the screen jackets 2 maybe arranged to remain static while the fibrous material inside said screen jacket is rotated in the direction denoted by arrow C.
  • the screen jacket 2 is caused to rotate in the direction denoted by arrow B and the fibrous material is caused to be rotated in the direction denoted by arrow C.
  • the screen pipes may also include brush rollers 4 arranged inside the pipes in a conventional manner, as disclosed in Finnish Patent 66,948.
  • the purpose of the brush rollers is to clean the jacket surfaces 2 of the screen pipes 1 and to improve the penetration of fibers through the openings or slots in jackets 2.
  • the brush rollers 4 may also function to actively rotate the injected fibrous material within the screen jacket 2.
  • the structure of the brush rollers is conventional and known for example from the aforementioned Finnish Patent.
  • a blade wheel 5 may be arranged inside the screen pipe 1 at the end opposite to the end where the fibers are input.
  • the purpose of the blade wheel is to slow down the fiber flow 3 inside the screen pipe 1.
  • a slower flow of fibers especially at the end of the screen pipe comprising the blade wheel enables fibers to be discharged through the jackets more evenly than previously along the entire length of the screen. This positive effect is most visible at the end of the screen pipe comprising the blade wheel.
  • Figure 2 shows a cross-section of the jacket provided in an illustrative embodiment of the screen pipe according to the invention.
  • the direction in which the screen pipe is rotated is denoted by arrow B
  • the direction in which a spiked roll 4 provided inside the jacket 2 is rotated is denoted by arrow C.
  • the arrows are opposite in direction to one another.
  • the essential feature of the screen pipe according to the invention is the direction in which grooves provided in the jacket meet the fiber flow that is in motion inside the jacket.
  • the fibrous material must first encounter the groove with the more obtuse angle before it encounters the groove with the more acute angle.
  • the rate of rotation of the fibrous material inside the screenjacket must be less than that of the screenjacket in the direction in which the screen jacket is rotating. This may be brought about by actively rotating both the screen j acket and the fibrous material, in opposite directions. This is the most preferred embodiment of the invention. However, the present application also contemplates embodiments wherein only the screenjacket is actively made to rotate. In this case the fibrous material inside the screenjacket will rotate somewhat due to frictional forces with the inner surface of the screenjacket. However, in this embodiment, the screenjacket will rotate at a higher rate than the fibrous material thereby causing the fibrous material to encounter the groove with the more obtuse angle before it encounters the groove with the more acute angle.
  • both the screenjacket and the fibrous material may be actively made to rotate in the same direction.
  • the screenjacket must be made to rotate at a higher rate than that of the fibrous material.
  • the present invention also contemplates embodiments in which the screenjacket is not rotating but dry fibrous material inside the screenjacket is rotating. In these embodiments, the fibrous material must rotate in a direction such that said fibrous material encounters the more obtuse angle groove before encountering the more acute angle groove. In embodiments wherein fibrous material is actively made to rotate in a given direction (i.e.
  • any component capable of causing this rotation without disabling the essential elements of the invention is suitable.
  • Preferred embodiments include the use of brush rollers 4 to actively rotate the fibrous material.
  • axial grooves 8 provided in the jacket 2 of the screen pipe are asymmetrical such that the edge 8a of the groove that is situated downstream with respect to the direction of rotation C of the fibrous material is at a more acute angle to the tangent of the jacket than the upstream edge 8b of the groove.
  • the angle of the downstream edge 8a of the profiled groove to the tangent of the jacket is perhaps most preferably about 90°, or more generally in the range of from 70° to 110°
  • the angle of the upstream edge 8b of the profiled groove to the j acket tangent is perhaps most preferably about 130°, or more generally in the range of from 100° to 160°.
  • the grooves and slots extend in linear arrays along the longitudinal axis of the screenjacket.
  • the grooves adjacent to a particular linear array of slots are continuous with each other and extend parallel to the linear array of slots.
  • a groove which is adjacent to a particular linear array of slots forms a single protuberance which rises from the inner wall of the screen jacket.
  • the grooves of this invention extend along the longitudinal axis of the screen pipe at least as far as that of the slots.
  • the grooves do not extend along the entire length of the longitudinal axis, nor do the slots; however, embodiments wherein the slots and grooves do extend along the entire length of the axis are within the scope of this invention.
  • the purpose of the profile asymmetry is to provide strong microturbulence and thus good formation, i.e. even distribution of fibers as a function of area, and also good capacity in dry formation.
  • the groove profile which generates strong microturbulence prevents the formation of a phenomenon known as a fine sieve, so that even rather long fibers are able to move through the jacket at high efficiency.
  • the arrangement is particularly useful with synthetic staple fibers and it is also suitable for chemical pulp fibers.
  • Holes or slots 9 via which the fibers are discharged from the screen pipe 1 are situated at the bottom of the profiled grooves 8. In the embodiment of Figure 2, and in preferred embodiments, the holes or slots have a size of 3 to 4.5 mm or 1.5 to 2 mm x 30 mm.
  • the total area of the holes or slots with respect to the entire area of the jacket may vary considerably, and it is usually a few dozen percent, such as about 25%.
  • the thickness of the jacket 2 can vary for example between 3 and 5 mm.
  • the screen jacket is composed of stainless steel in preferred embodiments. However, other embodiments include screenj ackets made of other metals. Other non-metal materials of sufficient strength to withstand the stress is of the normal operation of the screen pipe are also possible embodiments of the invention; these materials may include composite plastics or fiberglass.
  • the edges 8a and 8b of the profiled grooves are shown to be substantially straight, but they can also be curved as shown in Figure 4.
  • the angle of the edges to the jacket tangent would be determined by a line segment that connects the edge of the profiled groove which faces the hole or slot with the edge of the hole or slot 9 situated at the bottom of the groove nearest to the aforementioned edge of the groove. Therefore the shape of the groove profile in the screen pipe according to the invention can be modified without deviating from the scope of protection defined in the appended claims and from the basic idea of the invention, wherein the downstream edge of the groove is steeper than the upstream edge of the groove.
  • the cylindrical shape of the screen jacket of the screen pipe refers to the general shape of the jacket.
  • the invention contemplates minor or superficial alterations to the jacket which would have the effect of making the jacket less than a perfect cylinder.
  • the screenjacket of any particular screen pipe rotates in only a single direction during its normal operation. This direction of rotation in always such that the grooves comprising the more acute angle relative to the tangent of the rotational path of the slot are upstream of the slot and the grooves comprising the more obtuse angle.
  • the present application contemplates screen pipes comprising screen jackets configured such that they may rotate in a clockwise direction and screen pipes comprising screen jackets configured such that they may rotate in a counterclockwise direction.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Mechanical Engineering (AREA)
  • Nonwoven Fabrics (AREA)
  • Paper (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)

Abstract

L'invention concerne un tube filtre servant à former à sec un matériau en bande afin de distribuer une matière fibreuse soufflée à l'intérieur du tube filtre, à travers une gaine (2) du tube, sur un câble conçu pour se déplacer sous le tube. La matière fibreuse disposée à l'intérieur du tube filtre est déplacée, par exemple, au moyen d'un hérisson placé à l'intérieur du tube, de sorte que le mouvement de la matière fibreuse présente à la fois un élément radial et un élément tangentiel par rapport à la gaine (2) du tube filtre. La gaine comprend, sur sa face intérieure, des rainures profilées (8) creusées dans la direction axiale du tube. Le bord aval (8a) de la rainure profilée est située en aval de l'élément tangentiel du flux fibreux. Le bord amont (8b) de la rainure est située en amont de l'élément tangentiel du flux fibreux. Les parties inférieures des rainures profilées comportent des orifices ou des fentes (9) à travers lesquels les fibres sont déchargées du tube filtre. Selon l'invention, le bord aval (8a) des rainures profilées est disposé selon un angle plus aigu par rapport à l'élément tangentiel du flux fibreux que le bord amont (8b).
PCT/US2000/014631 1999-05-27 2000-05-26 Tube filtre pour former a sec un materiau en bande WO2000073032A1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
KR1020017015088A KR20020047039A (ko) 1999-05-27 2000-05-26 웨브 물질을 건식 성형하기 위한 스크린 파이프
BR0011588-6A BR0011588A (pt) 1999-05-27 2000-05-26 Aparelho para produzir um material entrelaçado a seco
JP2000621128A JP2003521590A (ja) 1999-05-27 2000-05-26 ウェブ状材料をドライフォーミングするためのスクリーンパイプ
EP00937855A EP1187708A1 (fr) 1999-05-27 2000-05-26 Tube filtre pour former a sec un materiau en bande
CA002374914A CA2374914A1 (fr) 1999-05-27 2000-05-26 Tube filtre pour former a sec un materiau en bande
AU52976/00A AU5297600A (en) 1999-05-27 2000-05-26 Screen pipe for dry forming web material
US09/988,897 US6726461B2 (en) 1999-05-27 2001-11-19 Screen pipe for dry forming web material

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI991203A FI107818B (fi) 1999-05-27 1999-05-27 Sihtiputki käytettäväksi rainamateriaalin kuivamuodostuksessa
FI991203 1999-05-27

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US09/988,897 Continuation US6726461B2 (en) 1999-05-27 2001-11-19 Screen pipe for dry forming web material

Publications (2)

Publication Number Publication Date
WO2000073032A1 WO2000073032A1 (fr) 2000-12-07
WO2000073032A9 true WO2000073032A9 (fr) 2002-04-18

Family

ID=8554745

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2000/014631 WO2000073032A1 (fr) 1999-05-27 2000-05-26 Tube filtre pour former a sec un materiau en bande

Country Status (9)

Country Link
EP (1) EP1187708A1 (fr)
JP (1) JP2003521590A (fr)
KR (1) KR20020047039A (fr)
CN (1) CN1352591A (fr)
AU (1) AU5297600A (fr)
BR (1) BR0011588A (fr)
CA (1) CA2374914A1 (fr)
FI (1) FI107818B (fr)
WO (1) WO2000073032A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10249533A1 (de) * 2002-10-23 2004-05-06 Fleissner Gmbh & Co. Maschinenfabrik Verfahren zum Betreiben einer Vorrichtung zum Legen eines Vlieses nach dem Luftlegeverfahren und Vorrichtung dazu
JP4570472B2 (ja) * 2005-01-24 2010-10-27 日本バイリーン株式会社 繊維分配装置及び繊維分配方法
CN101642643B (zh) * 2009-08-22 2011-07-13 湖州德翔环境科技有限公司 水预处理高效便捷过滤器
KR101107452B1 (ko) * 2009-11-30 2012-01-19 주식회사 화성기연 걸이식 철골 좌대
JP6248616B2 (ja) * 2013-12-25 2017-12-20 セイコーエプソン株式会社 シート製造装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2931076A (en) * 1948-11-23 1960-04-05 Fibrofelt Corp Apparatus and method for producing fibrous structures
US2738557A (en) * 1952-10-24 1956-03-20 Dick Co Ab Apparatus for the air deposition of fibers in the manufacture of fibrous structures
US4732552A (en) * 1984-05-21 1988-03-22 Kimberly-Clark Corporation Fiber processing apparatus having slotted outlets
US4640810A (en) * 1984-06-12 1987-02-03 Scan Web Of North America, Inc. System for producing an air laid web
US5882372A (en) * 1994-10-26 1999-03-16 Johns Manville International, Inc. Apparatus for use in confining a gaseous stream containing wet or sticky particles or fibers

Also Published As

Publication number Publication date
FI991203A0 (fi) 1999-05-27
JP2003521590A (ja) 2003-07-15
AU5297600A (en) 2000-12-18
FI991203A (fi) 2000-11-28
KR20020047039A (ko) 2002-06-21
FI107818B (fi) 2001-10-15
WO2000073032A1 (fr) 2000-12-07
CN1352591A (zh) 2002-06-05
EP1187708A1 (fr) 2002-03-20
CA2374914A1 (fr) 2000-12-07
BR0011588A (pt) 2002-03-19

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