EP0776395B1 - Water removal element in a paper machine and method of manufacturing such an element - Google Patents
Water removal element in a paper machine and method of manufacturing such an element Download PDFInfo
- Publication number
- EP0776395B1 EP0776395B1 EP95943511A EP95943511A EP0776395B1 EP 0776395 B1 EP0776395 B1 EP 0776395B1 EP 95943511 A EP95943511 A EP 95943511A EP 95943511 A EP95943511 A EP 95943511A EP 0776395 B1 EP0776395 B1 EP 0776395B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- water removal
- coat
- continuous section
- ceramic
- removal element
- 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.)
- Expired - Lifetime
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Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/48—Suction apparatus
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/48—Suction apparatus
- D21F1/483—Drainage foils and bars
Definitions
- the invention relates to a fixed water removal element according to the preamble of claim 1 in a paper or board machine, said element being adapted to squeegee the wire or press felt of the machine from the side opposite to the sheet side of the wire/felt.
- the invention also concerns a method of manufacturing such a water removal element.
- water removal elements are subjected to high wearing stresses. As web speeds in modern paper machines are today in the range 1000 - 1500 m/min, a wire or felt travelling over the surface of the water removal element hurls past the element at a substantial velocity. The wear is increased by the fillers used in papermaking such as clay, talc and chalk, and by unwanted impurities of the papermaking process.
- Fixed water removal elements are located at the wet end of the paper machine along its wire section and press section. Passing over the water removal element in the wire section is a wire woven from polymer monofilament, whereby the wire permits drainage of water from the paper sheet of high moisture content at this stage.
- the water removal elements squeegee water off the wire or impose a vacuum or pressure shocks on the wire. In the press section water is removed from the felt by suction.
- ceramic water removal elements are fabricated by assembling a long slice comprising adjoining ceramic pieces.
- the length of the slice is determined by the web width of the machine.
- the slice may be prepared from pieces machined to exact dimension that are mounted onto a precision pedestal, whereby a relatively smooth surface of the slice results.
- a better end result is achieved by means of a structure in which the ceramic pieces are adjacently glued to each other and the ready-assembled slice is ground to correct shape, whereby no height differences remain between the pieces.
- the most common materials for the pieces are aluminium oxide, silicon carbides and zirconium oxide.
- a slice structure assembled from ceramic pieces has several shortcomings. Even if the water removal element is assembled from pieces, the pieces become relatively massive and thus rather vulnerable to thermal shocks. Temperature variations in a piece pressed against a web moving at a high speed may be substantially rapid at, e.g., loss of water film lubrication between the piece and the web. Such thermal shocks cause local fractures of the pieces and erosion of the piece surfaces which increases the wear rate of the wire massively. A slice assembled from pieces may become deformed due to wear or displacement of the pieces. Shape defects of the slices cause disturbances in water removal and can ruin the sheet being manufactured.
- the greatest problems plaguing water removal elements made from ceramic pieces are associated with the inferior chemical and thermal resistance of adhesives used for joining the pieces.
- the adhesive applied to the joint has insufficient resistance to the wide temperature variations and strong chemicals occurring in a paper machine.
- the heaviest thermal loads occur when the wire travels without lubrication, that is, the machine is running dry. In this case the heat of friction can elevate the surface temperature of the ceramic piece in a few minutes by 120 - 200 °C. Since the thermal expansion coefficients of the ceramic material, the adhesive and the glass-fiber reinforced plastic body are different and the temperature profile of the slice is not homogeneous, substantial thermal stresses will develop in the slice that may detach the ceramic pieces from each other or totally separate them from the slice body.
- Adhesives employed for bonding the ceramic pieces are not sufficiently resistant to the warm waters of the paper machine which are chiefly detached from the web being dried.
- the degrading effect of the waters is amplified by the residual chemicals of the papermaking process contained in the waters.
- Experimental tests on the strength of an adhesive-bonded joint indicated that already after 200 hours of aging the bond strength of almost all adhesives was lowered by tens of percent and in some adhesive grades even below half of their initial strength during this aging period. Because the strength impairment of the adhesive bond may result in the detachment of the ceramic pieces, such a drastic loss of bond strength is not acceptable.
- the ceramic pieces may also rise above the slice surface which results in a so-called keyboard effect. Then, the elevated pieces mark the web with detrimental streaks. Hence, a water removal element requiring no adhesive bonds in its manufacture would be desirable.
- the WO 93/00473 describes a water removal element having a thin wear plate of stainless steel.
- the plate is coated by a ceramic coating and it is attached to a support structure by screws.
- the plate is thin, whereby it has to be fixed to the support structure at very short intervals in order to prevent deformation of the plate. Also, the nuts for the screws are welded into the plate.
- the drawback of this element is its complicated structure that is laborious to manufacture mainly because of above mentioned screw attachment.
- the goal of the invention is accomplished by manufacturing the water removal element from a continuous section of metal having its one side covered with a ceramic coat applied by thermal spray-coating and its interior filled with a cast thermoset plastic compound.
- the water removal element according to the invention is characterized by what is stated in the characterizing part of claim 1.
- the invention offers significant benefits.
- the invention is capable of entirely avoiding the use of an adhesive in the manufacture of a water removal element with a ceramic surface.
- the vulnerability of the element to damage is reduced as no piece can become detached therefrom under use.
- the thin, ceramic surface of the water removal element is most resistant to thermal shocks, this making it less sensitive to damage under rapid variations of the element temperature as compared with conventional ceramic elements.
- spray-coating a continuous surface is obtained, whereby the keyboard effect is avoided which plagues water removal elements assembled from ceramic pieces.
- the element has a relatively good inherent stiffness, because the metallic continuous section forms a shell structure with good resistance to stresses about the thermoset plastic compound core.
- the bodies of the water removal elements can have a relatively lightweight construction and dispose of the need for a separate plastic body for ceramic pieces.
- the element structure according to the invention is capable of minimizing the use of required expensive, stainless material to a very small amount, whereby a cost-efficient construction results.
- the present type of water removal element may be used in applications where conventional embodiments made from ceramic pieces have been too costly.
- the porous coat made by thermal coating is sealed, whereby good wear resistance and advantageous friction properties are obtained.
- a complete water removal element comprises a U-shaped continuous section 1 having, e.g., a ceramic coat 5 applied onto the base part 3 of the U-shaped continuous section so as to form a wear-resistant surface, and a thermoset plastic compound core 6 cast into the continuous section 1.
- a T-slot is machined into the thermoset plastic compound core 6, in the area between the legs of the U-shape, for mounting the water removal element.
- the continuous section of the water removal element body is made from stainless steel having its cross section comprising a base part 3 of the U-shaped continuous section forming a plane to which the legs 2 of the continuous section are joined extending orthogonally upward from the base part 3.
- the joining edge between the base part 3 and the legs 2 is provided with a chamfer 8, and the legs 2 end at inward bent flanges 4.
- the entire interior of the continuous section is filled by a thermoset plastic compound core 6.
- a water removal element with the above-described structure is manufactured in the following manner.
- a ceramic coat 5 is applied onto the base part 3 of the continuous section 1 cut to a suitable length by means of thermal spray-coating.
- the coat is sealed by impregnating the coat with a low-viscosity material having a high penetration capability into the coat.
- the interior of the continuous section is filled by casting it full of a thermoset plastic compound which is cured, whereby it adheres to the interior walls of the continuous section 1 thus stiffening the continuous section 1.
- the interior walls of the continuous section 1 may be sand-blasted or cleaned by any other suitable method.
- a mounting slot 7 is machined into the cast compound for mounting the water removal element at the desired place in the paper machine by means of a support frame.
- the outer surface of the coat is precision ground to correct shape.
- the water removal element according to the invention may be made from a variety of different materials. While the optimal material for the base part continuous section 1 is stainless steel, also aluminium, brass, duplex steel and other corrosion-resistant materials may be employed.
- the ceramic coat can be made from the following materials or mixtures thereof: Al 2 O 3 , Cr 2 O 3 , ZrO 3 , TiB 2 , SiO 2 , TiO 2 , WC and Cr 2 C 3 . However, when applied by thermal spray-coating, these materials remain more porous and softer than ceramic pieces made by sintering. Such a porous coat may wear down paper machine wires by the cutting action of the edges of the pores and the abrading action imposed on the wire by the filler particles and impurities lodging in the pores.
- the pores may be sealed with a suitable auxiliary material.
- Suitable materials are, e.g., organic resins and inorganic compounds. Of organic materials, the most suitable are low-viscosity epoxy resins which can be made to impregnate almost the entire porous volume of the coat. Moreover, such a sealing treatment improves the durability of the coat.
- inorganic materials can be used, e.g., phosphate compounds which are impregnated into the coat from aluminium hydroxide and phosphoric acid solutions. These compounds are then converted into crystalline form by a heat treatment.
- these compounds are capable of improving the wear resistance of the coat and their friction properties may further be enhanced by complementing the sealing treatment by auxiliary compounds with fluorinated resins.
- auxiliary compounds with fluorinated resins The selection of suitable sealing compounds is wide and at least phenolic resins, fluorinated resins, epoxy resins, phosphate compounds and methacrylate resins are well suited for use as sealing compounds.
- Thermal spray-coating can be used for applying coats on metallic surfaces only. Since the body of a water removal element must be of a non-rusting material, it would become excessively expensive with respect to competing solutions when made on, e.g. a solid stainless steel beam. According to the invention, this problem is overcome by manufacturing the body from a thin-walled continuous section which is stiffened by filling it with a thermoset plastic compound. In this manner the element can be made both stiff, lightweight and cost-efficient.
- thermoset plastics are suitable for use as the fill material of the continuous section including epoxy resins, methacrylate resins, polyester resins, vinyl ester resins, phenolic resins and mixtures thereof.
- the resin may be reinforced with, e.g., chopped glass fiber or ceramic particles.
- the above-described type of water removal element is suited for use as a water removal element squeegeeing a wire or felt.
- the invention may also be applied to other water removal elements of a paper machine that are in contact with a moving wire or felt.
- the shape of the element must be modified to suit the application.
- the shape of the continuous section can be widely varied and, for instance, the use of a continuous section with a closed perimeter is possible. Then, the outer surface of the section may be contoured so as to provide the mounting facility of the water removal element.
Landscapes
- Paper (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- Laminated Bodies (AREA)
- Apparatuses And Processes For Manufacturing Resistors (AREA)
Abstract
Description
Claims (9)
- A water removal element in a paper or board machine, said element comprising a body (1, 6) and a ceramic wear-resisting coat (5),
characterized in thatsaid body (1, 6) comprisesan elongated continuous section forming a bounded space into which a flowing material (6) can be cast, and at least one surface formed to accommodate the adherence of said wear-resisting coat (5),a thermoset plastic compound fill (6) cast to fill said bounded space at least partially, andsaid ceramic wear-resisting coat (5) is formed by a ceramic coat (5) applied onto a surface of the continuous section body (1) by thermal spray-coating. - A water removal element as defined in claim 1, characterized in that said continuous section (1) constituting the casting mould has an open cross-sectional shape, advantageously approximating a U-shape having its interior at least partially filled with a thermoset plastic compound and having said ceramic coat (5) adhered to its base part (3).
- A water removal element as defined in any of claims 1 and 2, characterized by a slot (7) machined into the thermoset plastic compound fill (6) for mounting the element to a support frame.
- A water removal element as defined in any of claims 1 - 3, characterized by having the coat (5) made from one of the following compounds: Al2O3, Cr2O3, ZrO3, TiB2, SiO2, TiO2, WC and Cr2C3, or a mixture thereof.
- A water removal element as defined in any of claims 1 - 4, characterized by having the coat (5) sealed by impregnation with, e.g., a compound selected from the group of the following compounds: phenolic resins, fluorinated resins, epoxy resins, phosphate compounds and methacrylate resins.
- A water removal element as defined in any of claims 1 - 5, characterized by having the fill compound of the continuous section (1) selected from one of the following groups of compounds: epoxy resins, methacrylate resins, polyester resins, vinyl ester resins and phenolic resins.
- A method of manufacturing a water removal element, characterized in that said method comprises at least the following steps:providing a body comprising an elongated continuous section forming a bounded space,a ceramic coat (5) is applied onto at least one surface of the continuous section (1) by thermal spray-coating, andthe interior of the continuous section (1) is filled at least partially with a thermoset plastic compound fill (6).
- A method as defined in claim 7, characterized in that the ceramic coat (5) is sealed by impregnating with a sealing compound.
- A method as defined in claim 7 or 8, characterized in that a mounting slot (7) is machined into said thermoset plastic compound fill (6) after the curing step of the plastic compound.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI943777 | 1994-08-17 | ||
FI943777A FI943777A (en) | 1994-08-17 | 1994-08-17 | Water removal device for a paper machine and process for making it |
PCT/FI1995/000413 WO1996005370A1 (en) | 1994-08-17 | 1995-08-03 | Water removal element in a paper machine and method of manufacturing such an element |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0776395A1 EP0776395A1 (en) | 1997-06-04 |
EP0776395B1 true EP0776395B1 (en) | 2000-02-02 |
Family
ID=8541206
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95943511A Expired - Lifetime EP0776395B1 (en) | 1994-08-17 | 1995-08-03 | Water removal element in a paper machine and method of manufacturing such an element |
Country Status (10)
Country | Link |
---|---|
EP (1) | EP0776395B1 (en) |
JP (1) | JPH10504357A (en) |
KR (1) | KR100253986B1 (en) |
AT (1) | ATE189494T1 (en) |
AU (1) | AU3079695A (en) |
CA (1) | CA2196093C (en) |
DE (1) | DE69514925T2 (en) |
FI (1) | FI943777A (en) |
NO (1) | NO309685B1 (en) |
WO (1) | WO1996005370A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013116397A1 (en) * | 2012-01-30 | 2013-08-08 | Paperchine Inc. | A cover device for a drainage apparatus for a papermaking machine |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6982116B1 (en) | 2000-02-18 | 2006-01-03 | Praxair S.T. Technology, Inc. | Coatings on fiber reinforced composites |
ATE354695T1 (en) * | 2001-05-15 | 2007-03-15 | Voith Patent Gmbh | MACHINE FOR PRODUCING A FIBER WEB FROM A FIBER SUSPENSION, METHOD FOR MONITORING A DRAINAGE ELEMENT OF A PAPER MACHINE AND PAPER MACHINE WITH A SYSTEM FOR MONITORING A DRAINAGE ELEMENT |
DE10130323A1 (en) * | 2001-06-22 | 2003-01-02 | Voith Paper Patent Gmbh | Wear body in laminated construction, in particular in a paper or board machine, process for its production and its use |
FI110439B (en) * | 2001-11-21 | 2003-01-31 | Metso Paper Inc | Dewatering foil for paper making machine, has hard coating layer formed on surface of adhesive layer which is formed on outer surface of composite element |
US7419704B2 (en) | 2005-08-18 | 2008-09-02 | Praxair S. T. Technology, Inc. | Coatings on fiber reinforced composites |
FI118211B (en) * | 2006-05-19 | 2007-08-31 | Metso Paper Inc | Static dewatering element for web forming machine, has thermally sprayed coating comprising agglomerate of powder particles containing primary particles with average size below preset value |
US9708766B2 (en) | 2012-01-30 | 2017-07-18 | Paperchine Inc. | Cover device for a drainage apparatus for a papermaking machine |
DE102012218961A1 (en) * | 2012-10-17 | 2014-04-30 | Sgl Carbon Se | Ceramic dewatering element formed in one piece, useful for a machine for producing a fibrous web, preferably a paper-, cardboard- or packaging paper web, comprises a ceramic carrier and a support for the ceramic carrier |
CN108589377A (en) * | 2018-04-21 | 2018-09-28 | 窦常平 | A kind of papermaking quick-dehydration device |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE470100B (en) * | 1991-06-20 | 1993-11-08 | Sjoedin Sven Eric | Drainage strip for the wire party by a paper machine |
-
1994
- 1994-08-17 FI FI943777A patent/FI943777A/en unknown
-
1995
- 1995-08-03 AU AU30796/95A patent/AU3079695A/en not_active Abandoned
- 1995-08-03 DE DE69514925T patent/DE69514925T2/en not_active Expired - Fee Related
- 1995-08-03 EP EP95943511A patent/EP0776395B1/en not_active Expired - Lifetime
- 1995-08-03 KR KR1019970700967A patent/KR100253986B1/en not_active IP Right Cessation
- 1995-08-03 WO PCT/FI1995/000413 patent/WO1996005370A1/en active IP Right Grant
- 1995-08-03 JP JP8507041A patent/JPH10504357A/en active Pending
- 1995-08-03 CA CA002196093A patent/CA2196093C/en not_active Expired - Fee Related
- 1995-08-03 AT AT95943511T patent/ATE189494T1/en not_active IP Right Cessation
-
1997
- 1997-02-14 NO NO970679A patent/NO309685B1/en unknown
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013116397A1 (en) * | 2012-01-30 | 2013-08-08 | Paperchine Inc. | A cover device for a drainage apparatus for a papermaking machine |
Also Published As
Publication number | Publication date |
---|---|
WO1996005370A1 (en) | 1996-02-22 |
FI943777A (en) | 1996-02-18 |
KR100253986B1 (en) | 2000-04-15 |
ATE189494T1 (en) | 2000-02-15 |
CA2196093A1 (en) | 1996-02-22 |
JPH10504357A (en) | 1998-04-28 |
FI943777A0 (en) | 1994-08-17 |
NO970679D0 (en) | 1997-02-14 |
NO309685B1 (en) | 2001-03-12 |
KR970704936A (en) | 1997-09-06 |
DE69514925T2 (en) | 2000-10-05 |
AU3079695A (en) | 1996-03-07 |
NO970679L (en) | 1997-02-14 |
DE69514925D1 (en) | 2000-03-09 |
EP0776395A1 (en) | 1997-06-04 |
CA2196093C (en) | 2007-01-09 |
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