US3793140A - Arc foil blade for machine wires of paper making machines - Google Patents

Arc foil blade for machine wires of paper making machines Download PDF

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Publication number
US3793140A
US3793140A US00199733A US3793140DA US3793140A US 3793140 A US3793140 A US 3793140A US 00199733 A US00199733 A US 00199733A US 3793140D A US3793140D A US 3793140DA US 3793140 A US3793140 A US 3793140A
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United States
Prior art keywords
body member
strip
paper making
machine
blade
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Expired - Lifetime
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US00199733A
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English (en)
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G Corbellini
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Individual
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Individual
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Publication of US3793140A publication Critical patent/US3793140A/en
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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
    • D21F1/483—Drainage foils and bars
    • D21F1/486—Drainage foils and bars adjustable

Definitions

  • An arc foil blade which is placed below a paper making machine forming wire to aid in liquid drainage is formed by a casting process and includes a body member made of plastic material, a strip of wear resistant hard casting metal alloy secured to the upper portion of the body member, and an elongated member made of antiabrasive plastic material secured to the body member in superimposed relation to the trailing edge portion thereof and presenting a substantially flat coplanar surface trailing from the strip of metal alloy.
  • a metal insert is embedded within the body member for reinforcement.
  • the casting alloy may contain 2 percent carbon, 35 percent chromium, 18 percent tungsten, cobalt, and traces of iron manganese, silicon, and nickel.
  • This invention relates to an arc foil blade for machine wires of paper making machines.
  • machine wire comprising a looped cloth belt and rotable on rollers, a wood pulp mixed with water being deposited on said machine wire from a headbox.
  • the water filters below the machine wire, as the latter is moving on its supporting rollers, so that the pulp will leave the machine wire at a wet state only and ready to become paper.
  • Another object is to provide a blade which may be made in a comparatively simple manner with a free edge intended to sweep the underside of the machine wire in paper making machines, this edge being perfectly straight and smooth.
  • Still another object is to provide a blade of a lower weight than that of the prior art blades and capable of being mounted below the machine wire onto a bearing, the simple pivoting of which allowing to remove the clearances as caused by wear'between the blade and machine wire the paper making machine operation.
  • an arc foil blade comprising a first elongated plastic material body reinforced by at least one metal insert and having a portion thereof which is shaped for mounting on a supporting beam, an elongated strip of antiabrasive hard metal alloy, not attackable by chemical agents and having a low coefficient of friction, this strip being fast with said first body and having a longitudinal edge thereof projecting from a longitudinal edge of said first body, and a second antiabrasive plastic material body fast with the first body and said strip, providing therewith a substantially flat free surface.
  • FIG. 1 is a schematical longitudinal view showing a portion of a machine wire and a cross-sectional view showing four arc foil blades located below said machine wire;
  • FIG. 2 is a perspective and partly sectional view of a blade
  • FIG. 3 is a cross-section of said blade according to line IIlIlI in FIG. 2.
  • FIG. 1 shows a portion of a machine wire 1 for a paper making machine, this machine wire moving in the direction of arrow F and on which a known type of headbox (not shown) has deposited the wood pulp 2.
  • Arc foil blades 3 are provided below the machine wire 1 and have a freelongitudinal edge sweeping the underside of machine wire 1, these blades 3 transversely extending of machine wire 1 and having a longitudinal dovetail groove allowing the blades to be mounted onto a shaped projection of a rigid beam 4 which is pivoted on a pin 5 carried by a fixed frame of the machine (forsimplicity also not shown in the drawing).
  • the machine wire 1 moves fast contacting the free edge of blades 3, where a vacuum is built up promoting the outlet of pulp 8 and water A through machine wire 1. As the machine wire moves rightward, the water content of pulp 2 evenly decreases and the thickness of the pulp on the machine wire decreases as well.
  • the body 7 has a body portion 7a provided with an upper portion 7c and a lower portion 7b.
  • the upper portion 7b has a leading edge portion 7' and a trailing edge portion 7.
  • the lower portion of said first body 7 has a longitudinal groove with inclined edge 10 con ferring a dovetail configuration to said groove and allowing the blade mounting by simple sliding on a dovetail-shaped projection forming part of one of the beams 4 previously described.
  • the first body 7 is also preferably reinforced by fiber glass uniformly distributed within the plastic material forming said body 7.
  • the elongated strip 6 is made of a carbon, chromium, tungsten, cobalt alloy, in the case comprising traces of iron, manganese, silicon and nickel, it being particularly found that an alloy comprising carbon 2 percent, chromium 35 percent, tungsten 18 percent, and cobalt and traces of iron, manganese, silicon and nickel to balance, will fully meet the desired purpose. It should be noted that the presence of iron, manganese, silicon and nickel in the alloy is not essential.
  • the transverse dimensions of the elongated metal strip 6 are somewhat reduced relative to the entire blade 3, which allows said strip to be provided in the desired configuration and with its free of leading edge 6a intended to project from the leading edge 7' of body 7 and to contact the substantially quite straight machine wire 1; this would be impossible or rather difficult to be obtained, should the blade 3 be made of the same metal alloy as that of strip 6, since the blade can be provided only'by casting and would considerably buckle when being cooled.
  • the mechanical operations which would then be required for making quite linear and flat the free edge of the blade intended to face the machine wire 1 would be extremely difficult due to transverse dimensions of the blade and resulting extent of deformations.
  • FIGS. 2 and 3 For providing the blade, as shown in FIGS. 2 and 3, use is made of a die havingarecess as shaped as the blade to be obtained.
  • the elongated metal strip 6 and metal insert 8 are first placed within the die recess and then the antiabrasive plastic material intended to form body 11 is poured. After hardening of body 11, the plastic material intended to form body 7 is poured into the die recess.
  • the plastic materials, forming bodies 7 and 11, are introduced into the die recess at a liquid state and, to cure therein, hardening and firmly binding to each other and strip 6.
  • An arc foil blade made by a casting process and adapted to be mounted below and in supporting relation to the machine wires of a paper making machine comprising,
  • a first elongated body member formed of plastic material having an upper and lower portion, a metal insert embedded within said body member for reinforcing the body member, the lower portion being formed for mounting on a supporting beam and the upper portion having a leading and a trailing edge portion in relation to the overlying moving wires,
  • a strip of wear resistant hard metal cast alloy secured to the upper portion of the first member and fixedly superimposed on the leading edge portion thereof with said strip having a leading edge portion projecting beyond the leading edge portion of the first member to contact the under surfaces of the wires, said strip consisting of about 2 percent carbon, about 35 percent chromium,about 18 percent tungsten and about 45 percent cobalt, and
  • a second elongated plastic materials member'of a thickness comparable to the metal cast alloy strip and secured to the first member in superimposed relation to the trailing edge portion thereof and presenting a substantially flat coplanar surface trailing from the strip of metal cast alloy.

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  • Paper (AREA)
  • Making Paper Articles (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Laminated Bodies (AREA)
US00199733A 1969-01-29 1971-11-17 Arc foil blade for machine wires of paper making machines Expired - Lifetime US3793140A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT6050469 1969-01-29

Publications (1)

Publication Number Publication Date
US3793140A true US3793140A (en) 1974-02-19

Family

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US00199733A Expired - Lifetime US3793140A (en) 1969-01-29 1971-11-17 Arc foil blade for machine wires of paper making machines

Country Status (7)

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US (1) US3793140A (en))
DE (1) DE1963667C3 (en))
FI (1) FI57280C (en))
FR (1) FR2029609A1 (en))
GB (1) GB1260442A (en))
NO (1) NO137909C (en))
SE (1) SE364535B (en))

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4106981A (en) * 1972-12-20 1978-08-15 Glauco Corbellini Procedure for obtaining elements to support the wire in continuous forming tables of paper-making machines, and the elements derived thereby for supporting the wire
US4184915A (en) * 1978-12-08 1980-01-22 Wilbanks International, Inc. Drainage foil apparatus with individually replaceable ceramic segments
US4232092A (en) * 1978-11-24 1980-11-04 Beloit Corporation Method of and means for precision mounting of members on elongate metallic supporting structure
US4425189A (en) 1981-03-25 1984-01-10 Hitachi Chemical Company, Ltd. Dehydrating blade for paper machine
US20020189777A1 (en) * 2001-06-15 2002-12-19 Metso Paper, Inc. Arrangement for doctoring a belt or a soft roll surfacing in a paper or board machine
DE10130323A1 (de) * 2001-06-22 2003-01-02 Voith Paper Patent Gmbh Verschleisskörper in Schichtverbundbauweise, insbesondere in einer Papier- oder Kartonmaschine, Verfahren zu seiner Herstellung und seine Verwendung
US20090308270A1 (en) * 2006-08-29 2009-12-17 Daetwyler Swisstec Ag Doctor blade

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4913404A (en)) * 1972-05-22 1974-02-05

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3351524A (en) * 1964-12-31 1967-11-07 Union Carbide Canada Ltd Device for promoting the removal of water from a paper-making pulp slurry
US3393124A (en) * 1964-02-07 1968-07-16 Feldmuehle Ag Elongated supporting elements for the fourdrinier wire of a papermaking machine
US3404066A (en) * 1965-02-17 1968-10-01 Union Carbide Corp Suction box cover
US3446702A (en) * 1966-01-24 1969-05-27 Johnson Wire Works Ltd Wear insert for paper machine drainage foil
US3535204A (en) * 1967-01-23 1970-10-20 Dominion Eng Works Ltd Foil mounting arrangement in a paper machine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3393124A (en) * 1964-02-07 1968-07-16 Feldmuehle Ag Elongated supporting elements for the fourdrinier wire of a papermaking machine
US3351524A (en) * 1964-12-31 1967-11-07 Union Carbide Canada Ltd Device for promoting the removal of water from a paper-making pulp slurry
US3404066A (en) * 1965-02-17 1968-10-01 Union Carbide Corp Suction box cover
US3446702A (en) * 1966-01-24 1969-05-27 Johnson Wire Works Ltd Wear insert for paper machine drainage foil
US3535204A (en) * 1967-01-23 1970-10-20 Dominion Eng Works Ltd Foil mounting arrangement in a paper machine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Bissell, Chromium Plating in the Paper Industry , Reprinted from The Paper Industry Nov. 1930. *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4106981A (en) * 1972-12-20 1978-08-15 Glauco Corbellini Procedure for obtaining elements to support the wire in continuous forming tables of paper-making machines, and the elements derived thereby for supporting the wire
US4232092A (en) * 1978-11-24 1980-11-04 Beloit Corporation Method of and means for precision mounting of members on elongate metallic supporting structure
US4184915A (en) * 1978-12-08 1980-01-22 Wilbanks International, Inc. Drainage foil apparatus with individually replaceable ceramic segments
US4425189A (en) 1981-03-25 1984-01-10 Hitachi Chemical Company, Ltd. Dehydrating blade for paper machine
US20020189777A1 (en) * 2001-06-15 2002-12-19 Metso Paper, Inc. Arrangement for doctoring a belt or a soft roll surfacing in a paper or board machine
US7033459B2 (en) * 2001-06-15 2006-04-25 Metso Paper, Inc. Arrangement for doctoring a belt or a soft roll surfacing in a paper or board machine
DE10130323A1 (de) * 2001-06-22 2003-01-02 Voith Paper Patent Gmbh Verschleisskörper in Schichtverbundbauweise, insbesondere in einer Papier- oder Kartonmaschine, Verfahren zu seiner Herstellung und seine Verwendung
US20040144514A1 (en) * 2001-06-22 2004-07-29 Bernd Bidlingmaier Wear components in a laminar structure in a paper of cardboard machine, and the procedure for its production and usage
US20090308270A1 (en) * 2006-08-29 2009-12-17 Daetwyler Swisstec Ag Doctor blade

Also Published As

Publication number Publication date
DE1963667A1 (de) 1970-09-03
SE364535B (en)) 1974-02-25
GB1260442A (en) 1972-01-19
FI57280B (fi) 1980-03-31
DE1963667B2 (de) 1978-03-30
FI57280C (fi) 1980-07-10
NO137909B (no) 1978-02-06
FR2029609A1 (en)) 1970-10-23
NO137909C (no) 1978-05-16
DE1963667C3 (de) 1978-11-23

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