US3574056A - Stripping foil assembly for paper machines - Google Patents

Stripping foil assembly for paper machines Download PDF

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Publication number
US3574056A
US3574056A US714747A US3574056DA US3574056A US 3574056 A US3574056 A US 3574056A US 714747 A US714747 A US 714747A US 3574056D A US3574056D A US 3574056DA US 3574056 A US3574056 A US 3574056A
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United States
Prior art keywords
foil
sections
ceramic
carrier
supporting member
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Expired - Lifetime
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US714747A
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English (en)
Inventor
Hans Jud
Manfred Nussbaum
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Feldmuehle AG
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Feldmuehle AG
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Publication date
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Publication of US3574056A publication Critical patent/US3574056A/en
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    • 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

  • Stripping foils made of sintered alumina or similar hard, but brittle, non-metallic materials have been disclosed in the commonly owned application Ser. No. 430,356, filed on Feb. 4, 1965, now Pat. No. 3,393,124, in which one of us is a co-inventor.
  • the sharp edges of these foils facing the rapidly moving Fourdrinier wire of a high-speed paper machine surprisingly resist the impact of the wire and do not damage the same.
  • the ceramic material is still vulnerable to damage from other sources, such as tools accidentally dropped by a careless mechanic. Although wear resistant to an astonishing degree, the ceramic sections which normally constitute each foil, ultimately must be reground or replaced.
  • the useful life of the ceramic sections depends on their proper seating on a metallic or other non-ceramic support. Stresses concentrated on narrow ceramic face portions and transmitted from the support tend to shorten the useful life of the sections.
  • a primary object of the invention is an improvement in the known stripping foil assemblies which overcomes the problems outlined above.
  • the invention in one 'of its aspects, interposes several supporting members between the ceramic foil sections and each carrier bar.
  • the supporting members are elongated in the direction of Fourdrinier wire width and are releasably secured to the carrier bar substantially in end-to-end relationship.
  • Groups of foil sections are attached to each supporting member, and are juxtaposed on the associated supporting member in the direction of elongation of the latter.
  • FIG. 1 shows a water stripping foil assembly of the invention in side elevational section
  • FIG. 2 shows a portion of the assembly of FIG. 1 on DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • a box-like frame 1 normally arranged under the Fourdrinier wire of a paper machine, as shown in the afore-mentioned copending application, while the wire moves from the left to the right, as indicated in FIG. 1 by an arrow.
  • the frame 1 is equipped with upright partitions 2 extending in the direction of wire width and stiffening the frame.
  • each partition 2 carry water stripping foil, 3, each foil having an acutely angular upper leading edge, consisting of sintered, high-purity alumina, and being mounted on a carrier bar 4 welded to the top edge of the associated frame wall or partition.
  • An elongated supporting member 5 is interposed between the carrier bar 4 and the ceramic foil 3.
  • the carrier bar 4 extends over the full width of the Fourdrinier wire or the machine frame, while the ceramic foil 3 is longitudinally divided into numerous sections '6, groups of five sections *6 being arranged on a common supporting member 5.
  • the latter are arranged end-to-end on the bar 4 in a sufiicient number to extend over almost the entire length of the bar 4, and their top faces are practically completely covered by the ceramic foil sections 6.
  • FIG. 2 The manner in which the assembly shown in FIGS. 1 and 3 is held together is best seen in FIG. 2.
  • the bottom faces of the ceramic sections 6 mounted on a common supporting member 5 have aligned slots 7 with inwardly flaring walls.
  • Heads 9 of screw 10 are recessed in the dovetail-shaped bottom part of the supporting member 5, and each screw 10 which passes through a bore of the member engages the locking bar 8.
  • the locking bar 8 holds broad, flat sea-ling faces of each foil section 6 and of the associated supporting member 5 in secure contact. The spatial relationship of the ceramic sections 6 to the steel member 5 is not normally disturbed during the useful life of the ceramic sections.
  • the bottom portion of the supporting member 5 is conformingly received in an upwardly open groove formed over the entire length of the carrier bar 4 by an integral shoulder portion 11 of the bar and retaining bars 12 longitudinally coextensive With the supporting members 5.
  • Clamping screws 13 whose heads 14 abut against the retaining bar 12 threadedly engage bores 15 in the carrier bar 4 which slope obliquely downwardly so that the bottom portion of the supporting element 5 is forced downward against the bar 4, and forward against the shoulder 11 when the screw 13 is tightened.
  • the precise location of the leading edge of foil 3 is determined by spacers, such as metallic shims or wedges, interposed between the faces of the bar 4 and of the member 5, which are pressed toward each other by the screw 13, a wedge-shaped spacer 16 being shown in FIG. 2 by way of example. Stress concentrations which might be caused in the relatively ductile metallic elements 4, 5 by the presence of the spacer 16 are readily tolerated, while similar stresses applied to the ceramic foil sections 6 might be destructive.
  • FIG. 4 shows a portion of a paper machine initially equipped with plastic water stripping foils, but modified according to this invention to accept sectional ceramic foils, the view corresponding to that of FIG. 2.
  • the stationary frame 1 of the know machine is equipped with several spacedly juxtaposed carrier bars 4' arranged in the manner of the bars 4 seen in FIG. 1.
  • a flanged rib 17 extends along the top of the bar 16 and was conformingly received in a groove of a plastic water stripping foil, when originally installed.
  • the foil assembly shown in FIG. 4 includes supporting members 18 of strong plastic, such as polyester resin reinforced with glass fibers, and jointly extending end-to-end over the length of the carrier bar 4', each supporting member 18 carrying five ceramic foil sections 6.
  • the individual sections are attached to the associated supporting member 18 by a locking bar 8 and by screws 10 as described above with reference to FIG. 2.
  • the row of supporting members 18 is longitudinally secured on the rib 17 by stops, not shown in the drawing.
  • the associated supporting members 5, 18 are removed from the frames 1, and the several section 6 on each supporting member are simultaneously ground so that their corresponding surfaces are precisely aligned in the direction of wire width. If all sections are reground, no further adjustment is needed when the supporting members 5, 1'8 are again installed on the carrier bars 4, 4'. If only the sections 6 on individual supporting elements 5, 18 are reground, the positions of the supporting elements may have to be adjusted by means of spacers as explicitly shown in FIG. 2 and some manual refinishing of the abuttingly engaged edges may be necessary. Similar adjustments by means of spacers are possible with the arrangement seen in FIG. 4 after some of the material of the carrier 18 has been ground or filed away.
  • each supporting element may be varied, of course, as specific conditions warrant. It is generally desirable to make each sub-assembly of one supporting member and several foil sections indentical with all the other sub-assemblies in order to minimize the number of spare parts that need to be stored to ensure uninterrupted production when one sub-assembly has to be removed.
  • the carrier bars 4, 4 may be 20 feet long and carry five supporting members, each four feet long and supporting five 24" foil sections.
  • Wedge-shaped spacers of the type illustrated in FIG. 2 may be used to adjust the angle of attack of the Fourdrinier wire, that is, the angle between the normal plane of movement of the wire and the top surface of the ceramic sections so as to adapt the foil assembly to changes in stuff composition which might otherwise impair the water stripping abilities of the foil assembly.
  • the spacers not only permit tilting of one supporting member relative to the others, but also joint angular adjustment of all supporting members.
  • a paper making machine having a frame, a Fourdrinier wire movable on the frame, and a water stripping foil assembly mounted under the wire, the assembly including a substantially rigid carrier member extending over the width of the wire and fixedly fastened to the machine frame, a plurality of foil sections of non-metallic ceramic material juxtaposed on the carrier member in the direction of the wire width and having aligned, acutely angular, exposed edges, and fastening means fastening the foil sections to the carrier member, the improvement in the fastening means which comprises:
  • attaching means attaching respective groups of said foil sections to each of said supporting members, the foil sections of each group being juxtaposed longitudinally of the associated supporting member;
  • said attaching means including release means operable to release each foil section from the associated supporting member.
  • said supporting members essentially consisting of material less brittle and tougher than said ceramic material.
  • said less brittle material being metal or plastic.
  • said supporting member and said carrier member having respective faces, and said securing means including clamping means urging said faces toward each other, and a spacer member interposed between said faces.

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US714747A 1967-03-22 1968-03-20 Stripping foil assembly for paper machines Expired - Lifetime US3574056A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEF0051909 1967-03-22

Publications (1)

Publication Number Publication Date
US3574056A true US3574056A (en) 1971-04-06

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US714747A Expired - Lifetime US3574056A (en) 1967-03-22 1968-03-20 Stripping foil assembly for paper machines

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US (1) US3574056A (enExample)
DE (1) DE1561659C3 (enExample)
FR (1) FR1557414A (enExample)
GB (1) GB1225160A (enExample)

Cited By (6)

* 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
US3870597A (en) * 1972-05-24 1975-03-11 Beloit Corp Drainage foil having a foil blade insert
JPS53162803U (enExample) * 1977-05-20 1978-12-20
JPS5571899A (en) * 1978-11-24 1980-05-30 Beloit Corp Precisely mounting of element in long and fine metal support
US4544449A (en) * 1983-10-11 1985-10-01 Beloit Walmsley Limited Apparatus for de-watering fibrous suspensions
US20050205227A1 (en) * 2004-03-17 2005-09-22 Klaus Bartelmuss Hydrofoil for papermaking installations

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT313697B (de) * 1970-06-16 1974-02-25 Feldmuehle Anlagen Prod Entwässerungselement für die Naßpartie einer Papiermaschine

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3870597A (en) * 1972-05-24 1975-03-11 Beloit Corp Drainage foil having a foil blade insert
US3836428A (en) * 1972-08-25 1974-09-17 Albany Int Corp Adjustable slot suction box cover
JPS53162803U (enExample) * 1977-05-20 1978-12-20
JPS5571899A (en) * 1978-11-24 1980-05-30 Beloit Corp Precisely mounting of element in long and fine metal support
US4232092A (en) * 1978-11-24 1980-11-04 Beloit Corporation Method of and means for precision mounting of members on elongate metallic supporting structure
US4544449A (en) * 1983-10-11 1985-10-01 Beloit Walmsley Limited Apparatus for de-watering fibrous suspensions
US20050205227A1 (en) * 2004-03-17 2005-09-22 Klaus Bartelmuss Hydrofoil for papermaking installations
US7387709B2 (en) * 2004-03-17 2008-06-17 Klaus Bartelmuss Hydrofoil for papermaking installations

Also Published As

Publication number Publication date
DE1561659A1 (de) 1970-03-19
FR1557414A (enExample) 1969-02-14
DE1561659C3 (de) 1974-02-28
GB1225160A (enExample) 1971-03-17
DE1561659B2 (de) 1973-08-09

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