US3738911A - Papermaking machine dewatering devices having diverging trailing surfaces which include wear-bearing insert materials - Google Patents

Papermaking machine dewatering devices having diverging trailing surfaces which include wear-bearing insert materials Download PDF

Info

Publication number
US3738911A
US3738911A US00091992A US3738911DA US3738911A US 3738911 A US3738911 A US 3738911A US 00091992 A US00091992 A US 00091992A US 3738911D A US3738911D A US 3738911DA US 3738911 A US3738911 A US 3738911A
Authority
US
United States
Prior art keywords
wear
bearing insert
crease line
forming medium
top surface
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
Application number
US00091992A
Other languages
English (en)
Inventor
A Kienzl
B Thorp
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huyck Corp
Original Assignee
Huyck Corp
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 Huyck Corp filed Critical Huyck Corp
Application granted granted Critical
Publication of US3738911A publication Critical patent/US3738911A/en
Assigned to HUYCK CORPORATION A CORP. OF NY. reassignment HUYCK CORPORATION A CORP. OF NY. MERGER (SEE DOCUMENT FOR DETAILS). EFFECTIVE 10-24-80 STATE OF DEL. Assignors: HUYCK CORPORATION (MERGED INTO) BTR FABRICS (USA) AND CHANGED INTO
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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

Definitions

  • This invention relates to dewatering devices for papermaking machinery and, more particularly, to hydrofoil blades which are characterized by having wear-bearing material forming the diverging trailing surface in the region of the crease line which forms its juncture between the trailing surface and the adjacent top surface.
  • Hydrofoil blades and their use as dewatering devices in papermaking machinery are well known in the papermaking arts. 'In this connection, reference is made to the following U.S. patents: 2,928,465; 2,928,466; 3,140,225; 3,165,440; 3,239,409; 3,239,410; 3,337,394; 3,377,236; 3,017,930, and 3,027,940. It is also well known to make such hydrofoil blades of materials such as ceramics in order to render them more resistant to the extreme chemical, thermal, and abrasive conditions to which they are normally exposed in the forming section of a papermaking machine. In this connection, reference is made to Canadian Patents No.
  • thermal abrasion resistance, friction, and wear characteristics are easy to form and shape by machining and other known methods by incorporating into selected portions of their surfaces that are subject to contact with the associated forming medium isolated regions of materials such as ceramics which are characterized by having the desired wear-tolerant characteristics.
  • U.S. Patent 3,446,702 U.S. Patent 3,446,702.
  • the forming medium bows upward over the top surface and the plane of contact, and, therefore, the region critical to wear of the trailing portion of the hydrofoil blade, is actually the leading portion of the trailing surface rather than at the trailing portion of the top surface. Therefore, if one follows the prior art disclosure of incorporating wear-bearing material at the trailing region of the top surface, as the front region of the trailing surface wears, the forming medium increasingly becomes exposed to the sharp (trailing) edge of the wear-bearing insert with consequent abrasion of the underside of the forming medium by virtue of the very hardness and wear resistance which is the desired property of the insert.
  • Another object of this invention is to produce a hydrofoil blade having improved wear resistance and a reduced tendency to abrade the associated forming medium.
  • Yet another object of this invention is to produce a hydrofoil blade having improved wear characteristics that is structurally more simple and less costly to produce than prior art devices.
  • FIG. 1 depicts a prior art device
  • FIG. 2 depicts an enlarged view of a portion of FIG. 1;
  • FIG. 3 depicts one embodiment of the present invention.
  • FIGS. 4A, 4B, and 4C depict other embodiments of the present invention.
  • Hydrofoil blade 10 which typically has a main body portion 12 made from plastic materials, such as high-density polyethylene or other easily formable material having the requisite thermal and chemical properties desired for use in the forming section of a papermaking machine.
  • Hydrofoil blade 10 comprises a top surface 14, and a leading surface 16 positioned at the front; i.e., toward the direction from which the forming medium comes when the machine is in normal use.
  • the leading surface 16 usually is at an acute angle to the top surface 14 to perform a doctoring effect.
  • Hydrofoil blade 10 also includes a trailing surface 18 which diverges from the top surface 14 along the crease line 20.
  • a wear-bearing insert 22 positioned at the rear of the top surface 14 for the purpose of imparting improved Wear properties primarily along the rear of the top surface 14, up to the crease line 20.
  • FIG. 2 there is depicted an enlargement of a portion of the device shown in FIG. 1 in the region of the wear-bearing insert.
  • a forming medium 26 such as a fourdrinier Wire or a forming fabric such as a Form-Fab fabric as produced by the Formex Company Division of Huyck Corporation in Greeneville, Tenn.
  • the region of vacuum 28 between the trailing surface 18 and the underside of the forming medium 26 tends to cause the forming medium 26 to deflect downward past the crease line 20 and to crown or bow upward immediately in front of the crease line 20 in the rear region of the top surface 14.
  • FIG. 3 there is depicted an embodiment of the present invention.
  • a wear-bearing insert made from suitable materials such as ceramics, tungsten carbide, and the like, is so positioned that it forms the front region of the trailing surface 18 with its foremost edge forming the crease line 20.
  • wear-bearing means any material having greater abrasion resistance and/or reduced friction properties than the material from which the 'main body of the hydrofoil blade is produced, in any of a variety of forms, including coatings, inserts, etc.
  • the wear-bearing insert 22 may, through the practice of the present invention, be utilized to maximum effectiveness to reduce wear and friction while at the same time minimizing exposure of any sharp corners of the wear-bearing insert 22, such as that forming the crease line 20, which will tend to abrade and, therefore, deteriorate the forming medium 26.
  • FIG. 3 the wear-bearing insert is depicted as having an inverted dovetail cross-section, it will be apparent from FIGS. 4A, 4B, and 4C that a wide variety of other shapes may be utilized to advantage in producing the wear-bearing inserts.
  • FIG. 4A there is depicted an elongated wear-bearing insert that may be accommodated in a slot in the hydrofoil blade that is made by the simple expedient of sawing or otherwise routing out.
  • FIG. 4B depicts a wear-bearing insert that is somewhat wider than that shown in FIG. 4A which may be used advantageously where wider regions of wear are encountered.
  • FIG. 4C depicts a wearbearing insert in the form of an inverted T which, by
  • a paper machine hydrofoil blade having a top surface, and a trailing surface which diverges downward from said top surface along a crease line, said hydrofoil blade being characterized by having a wear-bearing insert that forms said traling surface at least throughout that portion which is adjacent to said crease line; but forms no part of said top surface adjacent said crease line.
US00091992A 1970-11-23 1970-11-23 Papermaking machine dewatering devices having diverging trailing surfaces which include wear-bearing insert materials Expired - Lifetime US3738911A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US9199270A 1970-11-23 1970-11-23

Publications (1)

Publication Number Publication Date
US3738911A true US3738911A (en) 1973-06-12

Family

ID=22230665

Family Applications (1)

Application Number Title Priority Date Filing Date
US00091992A Expired - Lifetime US3738911A (en) 1970-11-23 1970-11-23 Papermaking machine dewatering devices having diverging trailing surfaces which include wear-bearing insert materials

Country Status (13)

Country Link
US (1) US3738911A (it)
JP (1) JPS5037283B1 (it)
AR (1) AR199072A1 (it)
AT (1) AT314344B (it)
AU (1) AU458329B2 (it)
BR (1) BR7107760D0 (it)
CA (1) CA938482A (it)
DE (1) DE2154901C3 (it)
FI (1) FI51974C (it)
FR (1) FR2115974A5 (it)
GB (1) GB1323215A (it)
IT (1) IT942829B (it)
SE (1) SE368431B (it)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4331511A (en) * 1980-05-09 1982-05-25 Beloit Corporation Paper making machine foil having low disturbance profile and self-sharpening tip
US4861432A (en) * 1987-11-03 1989-08-29 Huyck Corporation Dual compartment vacufoil unit to eliminate secondary headbox chatter
US5076894A (en) * 1990-05-04 1991-12-31 Simmons Holt W Suction box apparatus with composite cover elements mounted in slots on cross braces
US5830322A (en) * 1996-02-13 1998-11-03 Thermo Fibertek Inc. Velocity induced drainage method and unit
US5922173A (en) * 1997-04-22 1999-07-13 Thermo Fibertek Inc. Paper forming activity control with lifting variable inertial stimulation blades with limited-vent indented-surfaces
US6562197B2 (en) * 2000-11-08 2003-05-13 Andrew S. Forester Drainage hydrofoil blade
WO2007088456A2 (en) 2006-02-03 2007-08-09 Cabrera Y Lopez Caram Luis Fer Fiber mat forming apparatus and method of preserving the hydrodynamic processes needed to form a paper sheet
WO2012083129A1 (en) 2010-12-16 2012-06-21 Fcpapel Llc Energy saving papermaking forming apparatus and method for lowering consistency of fiber suspension
WO2013013133A2 (en) 2011-07-21 2013-01-24 Fcpapel Llc Energy saving papermaking forming apparatus, system, and method for lowering consistency of fiber suspension

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4331511A (en) * 1980-05-09 1982-05-25 Beloit Corporation Paper making machine foil having low disturbance profile and self-sharpening tip
US4861432A (en) * 1987-11-03 1989-08-29 Huyck Corporation Dual compartment vacufoil unit to eliminate secondary headbox chatter
US5076894A (en) * 1990-05-04 1991-12-31 Simmons Holt W Suction box apparatus with composite cover elements mounted in slots on cross braces
US5830322A (en) * 1996-02-13 1998-11-03 Thermo Fibertek Inc. Velocity induced drainage method and unit
US5922173A (en) * 1997-04-22 1999-07-13 Thermo Fibertek Inc. Paper forming activity control with lifting variable inertial stimulation blades with limited-vent indented-surfaces
US6562197B2 (en) * 2000-11-08 2003-05-13 Andrew S. Forester Drainage hydrofoil blade
WO2007088456A2 (en) 2006-02-03 2007-08-09 Cabrera Y Lopez Caram Luis Fer Fiber mat forming apparatus and method of preserving the hydrodynamic processes needed to form a paper sheet
US20090301677A1 (en) * 2006-02-03 2009-12-10 Cabrera Y Lopez Caram Luis Fernando Fiber mat forming apparatus and method of preserving the hydrodynamic processes needed to form a paper sheet
US7993492B2 (en) 2006-02-03 2011-08-09 FC Papel LLC Fiber mat forming apparatus and method of preserving the hydrodynamic processes needed to form a paper sheet
EP2966219A1 (en) 2006-02-03 2016-01-13 Cabrera y Lopez Caram, Luis Fernando Fiber mat forming apparatus and method of preserving the hydrodynamic processes needed to form a paper sheet
WO2012083129A1 (en) 2010-12-16 2012-06-21 Fcpapel Llc Energy saving papermaking forming apparatus and method for lowering consistency of fiber suspension
WO2013013133A2 (en) 2011-07-21 2013-01-24 Fcpapel Llc Energy saving papermaking forming apparatus, system, and method for lowering consistency of fiber suspension
US8747618B2 (en) 2011-07-21 2014-06-10 FC Papel LLC Energy saving papermaking forming apparatus, system, and method for lowering consistency of fiber suspension

Also Published As

Publication number Publication date
AU3533571A (en) 1973-05-10
JPS5037283B1 (it) 1975-12-01
DE2154901B2 (de) 1974-03-21
FI51974B (it) 1977-01-31
DE2154901C3 (de) 1980-06-26
IT942829B (it) 1973-04-02
FI51974C (fi) 1977-05-10
DE2154901A1 (de) 1972-06-15
SE368431B (it) 1974-07-01
AU458329B2 (en) 1975-02-27
BR7107760D0 (pt) 1973-03-13
CA938482A (en) 1973-12-18
FR2115974A5 (it) 1972-07-07
GB1323215A (en) 1973-07-11
AT314344B (de) 1974-03-25
AR199072A1 (es) 1974-08-08

Similar Documents

Publication Publication Date Title
US3738911A (en) Papermaking machine dewatering devices having diverging trailing surfaces which include wear-bearing insert materials
US4194790A (en) Rock cutting tip inserts
US3446702A (en) Wear insert for paper machine drainage foil
US4687549A (en) Hydrofoil blade
JPH04507439A (ja) ツインワイヤ式フォーマ
NO871955D0 (no) Papirmaskinduk.
US2361288A (en) Cutting rule
USRE40720E1 (en) Fabric support element for a papermaking machine
US4004969A (en) Paper machine drainage foil with wear-resistant insert
US4425188A (en) Forming shoes for the twin-wire former of a paper making machine
US4184915A (en) Drainage foil apparatus with individually replaceable ceramic segments
US3432385A (en) Water extraction devices
US3067816A (en) Apparatus and process for the manufacture of paper
US2498213A (en) Doctor device for rolls and cylinders
GB1232681A (it)
GB1221695A (en) Pickup arrangement for a papermaking machine
US5013406A (en) Trailing element device for a headbox
GB1274027A (en) Drainage foil for fourdrinier machines or similar drainage apparatus
US3165440A (en) Drainage element for the wire of a paper making machine
US3876500A (en) Fourdrinier paper-making machine with water-control base wire positioned beneath forming wire
US6669820B2 (en) Twin-wire former
JPS5914599B2 (ja) 抄紙機のフオイル
US3404066A (en) Suction box cover
US2126152A (en) Ski
US4238286A (en) Dewatering table bar for the wire cloth or felt in a pulp-dewatering machine

Legal Events

Date Code Title Description
AS Assignment

Owner name: HUYCK CORPORATION A CORP. OF NY.

Free format text: MERGER;ASSIGNOR:HUYCK CORPORATION (MERGED INTO) BTR FABRICS (USA) AND CHANGED INTO;REEL/FRAME:003927/0115

Effective date: 19810630