US3393123A - Felt conditioning apparatus for papermaking machine - Google Patents

Felt conditioning apparatus for papermaking machine Download PDF

Info

Publication number
US3393123A
US3393123A US430316A US43031665A US3393123A US 3393123 A US3393123 A US 3393123A US 430316 A US430316 A US 430316A US 43031665 A US43031665 A US 43031665A US 3393123 A US3393123 A US 3393123A
Authority
US
United States
Prior art keywords
felt
sections
aluminum oxide
facing
slot
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
US430316A
Other languages
English (en)
Inventor
Emil A Klingler
Felder Heinz
Schubert Alfred
Jud Hans
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.)
Feldmuehle AG
Original Assignee
Feldmuehle AG
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 Feldmuehle AG filed Critical Feldmuehle AG
Application granted granted Critical
Publication of US3393123A publication Critical patent/US3393123A/en
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
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/08—Felts
    • D21F7/12—Drying
    • 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
    • D21F1/52—Suction boxes without rolls
    • D21F1/523—Covers thereof

Definitions

  • This invention relates to papermaking machinery, and particularly to felt conditioning apparatus for use in the press section of a Fourdrinier type papermaking machine.
  • Known felt suction boxes may consist of an axially slotted tube connected to a vacuum line. The felt passes approximately tangentially over the slotted surface.
  • press felts can be greatly increased by making at least those portions of the associated felt suction boxes which are in direct contact with the felts of sintered, dense, and very hard ceramic materials, and more specifically, to support facing plate sections of such material on a carrier structure which extends over the width of the felt to be conditioned, the several sections being juxtaposed in the direction of felt width on either side of the suction slot.
  • the dimension of each individual section in that direction is but a fraction of the felt width, and the several sections are individually secured to the carrier structure in such a manner that they are capable of limited movement relative to each other.
  • FIG. 3 shows a modified felt suction box of the invention in a fragmentary sectional view corresponding to that of FIG. 1;
  • FIG. 4 shows yet another felt suction box of the invention in a sectional view as in FIG. 1.
  • FIG. 1 there is seen the tubular cast iron shell 1 of a 3,393,123 Patented July 16, 1968 'ice felt suction box.
  • a drainage nipple 2 at the lowest point of the shell 1 is connected to a vacuum line when the suction box is operated.
  • a longitudinal slot 3 divides the flat top of the shell 1 so that two bar portions of the shell 1 extend along the two sides of the slot 3.
  • Facing plate sections 4 cover the two bar portions of the shell 1 practically over their entire length.
  • a rib 5 projecting from the underside of each plate section 4 engages one of two grooves in the shell 1 which extend over the full length of the shell on either side of the slot 3.
  • the grooves are of shallow rectangular section.
  • the exposed top faces of the sections 4 have rounded longitudinal edges 6.
  • the exposed faces of the plates are of parallelogram shape. They are contiguously juxtaposed so that adjacent plates 4 or 4 form therebetween a joint 7 which is obliquely inclined relative to the direction of elongation of the shell 1, and relative to the direction of felt movement which is perpendicular to the length of the shell in the plane of FIG. 2.
  • the longitudinal ends of the slot 3 are provided in a conventional manner with bronze deckle blocks 8 having lateral ribs 9 slidably received in longitudnailly elongated recesses in the walls of the slot 3.
  • Approximately prismatic facing plate sections 10 cover the deckle blocks 8 and have rounded edges at their exposed faces which are flush with those of the sections 4.
  • Screws 11 are provided for shifting the blocks 8 longitudinally in the slot 3 and for thereby varying the effective length of the slot in a manner known in itself.
  • the facing plate sections 4, 4', 10 are secured to the supporting metal elements 1, 8 by an epoxy resin cement in a layer too thin to permit pictorial representation on the scale of FIG. 1.
  • the engagement of the ribs 5 on the plate sections 4, 4' with the grooves of the shell 1 further secure the sections against the frictional stresses transmitted by the felt which moves over the exposed faces of the plate sections.
  • the sections 4, 4', 10 consist of sintered fairly pure aluminum oxide and are prepared by the method disclosed in more detail in the commonly owned copending application Ser. No. 240,735, filed Nov. 28, 1962. They contain at least percent A1 0 and are shaped by molding and by firing the green compacts at a temperature above 1000 C., and preferably above 1200 C.
  • Aluminum oxide sections containing less than 95 percent Al O have a significantly shorter useful life than those made of purer material under otherwise analogous conditions. It is difficult, if at all possible, to produce sinte'red elements of a density approaching that of corundum from less pure raw materials. It is also believed that a very small grain size is not readily available in the presence of an excessive amount of impurities, yet is desirable.
  • the surface finish of the aluminum oxide bodies affects felt life and the durability of the facings. Rather surprisingly, exposed facing surfaces of the highest possible polish do not produce the best results. It has been found most advantageous to finish the exposed surfaces in such a manner that a layer on a level 0.5 micron below the enveloping surface defined by the high points of the exposed face consists of not more than 75 percent and not less than percent solid material, the remainder being occupied by voids.
  • Such a surface structure may be obtained directly by judicious selection of starting materials and of suitable temperatures and times in the sintering process, but is more readily produced by grinding and polishing an originally rougher surface.
  • a secondary sintering operation or flame polishing also have been used successfully for the purpose.
  • the end point of the smoothing operation is determined by means of a known surface analyzer having a microscopic stylus which scans the surface. The movements of the stylus are transmitted to a recorder which plots a curve. Peaks of the curve represent the high points of the scanned surface. A first line is drawn on the plot to connect these peaks, and a second line parallel to the first line helpsects areas under the curve representing solid material, and areas above the curve representing voids. Smoothing of the surface is continued until the desired ratio of solid material and voids is obtained for all directions of stylus movement on the exposed face.
  • the felt suction box shown in FIG. 3 has a troughshaped lower part 13, partly broken away in FIG. 3, but fully shown in FIG. 4 and connected to a suction line.
  • Two carrier bars 14 welded to the trough-shaped part 13 extend inward of the trough opening to define therebetween a slot 3.
  • the longitudinally terminal portions of the bars 14 are connected by a plate 15 welded to the bars.
  • Deckle blocks 16 are movably mounted in the slot 3 in the known manner described with reference to FIG. 1. They are covered with cemented aluminum oxide facings 17, whereas the carrier bars 14 are protected by respective facing plate sections 18, only one of the numerous sections associated with each carrier bar being illustrated.
  • a dovetail-shaped projection 19 at the underside of each facing plate section 18 engages a notch at the outer edge of the top face of each carrier bar 14.
  • the notch has a fiat, horizontal wall which is in contact with the centrally recessed bottom face of the projection 19, and another wall which extends obliquely upward at an acute angle to the bottom wall.
  • the oblique wall of the bar 14 conformingly engages a corresponding wall of the projection 19.
  • the dimensions of the projection 19 are such that there is no direct contact between any other portion of the facing plate section 18 and the associated carrier bar '14.
  • the facing plate sections are urged horizontally inward of the notches in the carrier bars 14 by two clamping devices each of which includes several screws 20 longitudinally spaced along each carrier bar 14 and threadedly engaging the same. Only one screw 20 in each bar 14 is visible in FIG. 3.
  • the screws 20 pass through corresponding bores in an elongated clamping bar 21 one longitudinal edge of which engages an edge portion of the carrier bar -14 and is pivoted on the bar 14 when the screws 20 are tightened.
  • a resilient spacer 22 is interposed between the other longitudinal edge of the clamping bar 21 and a side face of the projection 19 of the facing plate section 18. When the screws 20 are tightened, the facing plate sections 18 are firmly anchored in the notches of thecarrier bars 14.
  • the spacers 22, which may be of cork, leather, rubber, or the like, distribute the pressure of the clamping bar 21 over the surface of the brittle ceramic facings.
  • the welded shell of the felt suction box shown in FIG. 4 consists of a trough 13- whose top is closed by two carrier bars 24, 24 except for a slot 3, the carrier bars being connected by Welded plates 15 at their two ends, and deckle blocks 16 covered by cemented aluminum oxide facings '17 being provided for adjusting the effective length of the slot 3 to the width of the felt, not itself shown, which travels over the illustrated structure in the direction of the arrow.
  • the two sets of aluminum oxide facing plate sections 25 which cover the carrier bars 24, 24' have ribs 26 on their undersides which engage conforming notches in the top faces of the associated carrier bars at the leading edges thereof.
  • the notch in the carrier bar 24 thus is contiguous to the slot 3 whereas the notch of the carrier bar 24' is remote from the slot.
  • Stepped cylindrical bores 30 in the facing plate sections 25 are coaxially aligned with threaded bores in the associated carrier bars 24, 24.
  • the orifices of the bores 30 in the exposed face of the facing plate section 25 con stitute the widest axial portion of the bore.
  • the several sections of the bore 30 define shoulders therebetween.
  • a resilient washer 28 is interposed between one of the shoulders and the annular clamping face at the underside of the screw head.
  • a plate shaped plug 2? of sintered aluminum oxide is adhesively fastened to the other shoulder and fills the orifice of the bore 30 flush with the ex posed face of the facing plate section.
  • said sections consisting essentially of sintered aluminum oxide.
  • each section consisting of not more than per-cent and not less than 10 percent solids at a level 0.5 micron below a surface defined by the high points of a face of said plate section directed away from the associated carrier bar means.
  • said fastening means including a clam-ping member secured to said associated carrier bar means for movement toward said section.
  • said fastening means further including a resilient member contiguousl y interposed between said clamping member and said section.
  • said clamping member being a screw having a threaded stern threadedly engaging said associated carrier bar means, and a head having an annular clamping face, said section being formed with a bore therethrough having an orifice in an exposed face of said section directed away from said carrier bar means, and having shoulder means in said bore for cooperation with said clamping face, said head being received in said bore intermediate said orifice and said shoulder means, and plug means in said orifice flush with said exposed face for closing said orifice.
  • said fastening means including a layer of epoxy resin cement interposed between said carrier bar means and each of said sections.

Landscapes

  • Paper (AREA)
US430316A 1964-02-07 1965-02-04 Felt conditioning apparatus for papermaking machine Expired - Lifetime US3393123A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEF25359U DE1900459U (de) 1964-02-07 1964-02-07 Rohrsauger in papiermaschinen.

Publications (1)

Publication Number Publication Date
US3393123A true US3393123A (en) 1968-07-16

Family

ID=7091597

Family Applications (1)

Application Number Title Priority Date Filing Date
US430316A Expired - Lifetime US3393123A (en) 1964-02-07 1965-02-04 Felt conditioning apparatus for papermaking machine

Country Status (5)

Country Link
US (1) US3393123A (fi)
AT (1) AT279334B (fi)
BE (1) BE659346A (fi)
DE (1) DE1900459U (fi)
GB (1) GB1103278A (fi)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3836428A (en) * 1972-08-25 1974-09-17 Albany Int Corp Adjustable slot suction box cover
US3869344A (en) * 1972-07-19 1975-03-04 Int Paper Co Flexible ceramic member having a pre-loaded tensile force applying means
US3871953A (en) * 1972-07-19 1975-03-18 Charles A Lee Papermaking system including a flexible ceramic member having a pre-loaded tensile force applying means
USRE29417E (en) * 1974-03-28 1977-09-27 International Paper Company Papermaking system including a flexible ceramic member having a pre-loaded tensile force applying means
USRE29418E (en) * 1973-07-10 1977-09-27 International Paper Company Flexible ceramic member having a pre-loaded tensile force applying means
US4087321A (en) * 1976-01-23 1978-05-02 Escher Wyss Gmbh Head box having distributor pipe connected to a pulp guide block
US4184915A (en) * 1978-12-08 1980-01-22 Wilbanks International, Inc. Drainage foil apparatus with individually replaceable ceramic segments
US4270978A (en) * 1979-07-30 1981-06-02 Huyck Corporation Positive pressure felt dewatering and cleaning device and method

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2229509C2 (de) * 1971-07-01 1983-01-20 Heinrich Ing. Teufenbach Steiermark Bartelmuss Hartbelag
US4265706A (en) * 1978-11-02 1981-05-05 Albany International Corp. Drainage device with bonded wear surface and method of fabrication
DE19539569C1 (de) * 1995-10-25 1997-05-28 Voith Sulzer Papiermasch Gmbh Siebpartie einer Papiermaschine oder einer Vliesmaschine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1977352A (en) * 1934-10-16 Suction box top for a paper making
US3250671A (en) * 1965-05-07 1966-05-10 Beloit Corp Liquid flow control device having improved surface for operative engagement with relatively moving paper machine forming wire

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1977352A (en) * 1934-10-16 Suction box top for a paper making
US3250671A (en) * 1965-05-07 1966-05-10 Beloit Corp Liquid flow control device having improved surface for operative engagement with relatively moving paper machine forming wire

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3869344A (en) * 1972-07-19 1975-03-04 Int Paper Co Flexible ceramic member having a pre-loaded tensile force applying means
US3871953A (en) * 1972-07-19 1975-03-18 Charles A Lee Papermaking system including a flexible ceramic member having a pre-loaded tensile force applying means
US3836428A (en) * 1972-08-25 1974-09-17 Albany Int Corp Adjustable slot suction box cover
USRE29418E (en) * 1973-07-10 1977-09-27 International Paper Company Flexible ceramic member having a pre-loaded tensile force applying means
USRE29417E (en) * 1974-03-28 1977-09-27 International Paper Company Papermaking system including a flexible ceramic member having a pre-loaded tensile force applying means
US4087321A (en) * 1976-01-23 1978-05-02 Escher Wyss Gmbh Head box having distributor pipe connected to a pulp guide block
US4184915A (en) * 1978-12-08 1980-01-22 Wilbanks International, Inc. Drainage foil apparatus with individually replaceable ceramic segments
US4270978A (en) * 1979-07-30 1981-06-02 Huyck Corporation Positive pressure felt dewatering and cleaning device and method

Also Published As

Publication number Publication date
AT279334B (de) 1970-03-10
BE659346A (fi) 1965-05-28
GB1103278A (en) 1968-02-14
DE1900459U (de) 1964-09-10

Similar Documents

Publication Publication Date Title
US3393123A (en) Felt conditioning apparatus for papermaking machine
US2114072A (en) Press roll for paper making machines and the method of making same
RU2006132319A (ru) Измельчающие валки для вертикальной дробилки
US3870597A (en) Drainage foil having a foil blade insert
US3067816A (en) Apparatus and process for the manufacture of paper
US8152969B2 (en) Hydrofoil for a papermaking installation
CA1069740B (en) Flexible ceramic member and method for making same
US3732142A (en) Insert for paper machine drainage elements
CA2544659C (en) Paper machine press roll, its manufacturing method, pressing method of wet paper web and surface grinding method of paper machine press roll
USRE29417E (en) Papermaking system including a flexible ceramic member having a pre-loaded tensile force applying means
US1962947A (en) Abrasive device
JPS5690427A (en) Surface smoothing method of substrate for magnetic disc
TWI706930B (zh) 陶瓷構造體
US20150367480A1 (en) Chemical mechanical polishing conditioner
FI88938C (fi) Foerfarande och anordning foer skaerpning av ytan foer traeslipsmaskinens slipsten
US3404066A (en) Suction box cover
CN101310073B (zh) 带传感器脱水板、脱水板装置
US2421886A (en) Pulpstone
USRE29418E (en) Flexible ceramic member having a pre-loaded tensile force applying means
KR100336764B1 (ko) 화학 기계적 연마용 패드의 구조
KR900002259Y1 (ko) 연마 로울러
SU848521A1 (ru) Гидропланка
KR950009848B1 (ko) 자기헤드 갭(gap)면의 연마방법
US3262842A (en) Suction box cover for a papermaking machine
SU1416572A2 (ru) Дефибрерный камень дефибрера