WO1989004381A1 - Elimination du liquide d'enduction excedentaire d'une bande se deplaçant vers le haut et verticalement - Google Patents

Elimination du liquide d'enduction excedentaire d'une bande se deplaçant vers le haut et verticalement Download PDF

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Publication number
WO1989004381A1
WO1989004381A1 PCT/AU1987/000382 AU8700382W WO8904381A1 WO 1989004381 A1 WO1989004381 A1 WO 1989004381A1 AU 8700382 W AU8700382 W AU 8700382W WO 8904381 A1 WO8904381 A1 WO 8904381A1
Authority
WO
WIPO (PCT)
Prior art keywords
strip
edge
coating liquid
upwardly
carrier plate
Prior art date
Application number
PCT/AU1987/000382
Other languages
English (en)
Inventor
Cat Vo Tu
Original Assignee
John Lysaght (Australia) Limited
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 John Lysaght (Australia) Limited filed Critical John Lysaght (Australia) Limited
Priority to PCT/AU1987/000382 priority Critical patent/WO1989004381A1/fr
Priority to JP50000587A priority patent/JPH02502169A/ja
Publication of WO1989004381A1 publication Critical patent/WO1989004381A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
    • C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
    • C23C2/18—Removing excess of molten coatings from elongated material
    • C23C2/20—Strips; Plates

Definitions

  • This invention relates to apparatus for stripping excess coating liquid from continuous strip material.
  • the coating liquid may be paint, glue, molten metal or other common coating liquid, and the strip (to which the particular coating must, of course, be appropriate) may for example be paper, metal or other strip material pliant enough for reeling and amenable to production in long runs; for example, lengths running to thousands of metres.
  • the present invention is applicable to jet stripping in the general sense indicated above, it is primarily concerned with excess coating removal near the edges of steel strip during the stripping of excess molten coating metal as the strip emerges substantially vertically from a molten metal bath, and the invention is described hereinafter mainly in terms of that particular use.
  • one of the generally preferred methods of the prior art to remove excess metal from the steel strip, is to arrange for the coated strip, as it leaves the molten metal coating bath to move vertically through a zone containing the jet stripping means and, once the coating has solidified and the coated strip cooled, the coated strip is then reeled.
  • the jet stripping means comprises essentially a pair of linearly extending gas nozzles disposed substantially horizontally on either side of the strip, at a distance above the surface of the coating bath such that the coating on the strip is still molten upon arrival in the stripping zone.
  • the lateral span of the stripping jets is normally greater than the width of the strip passing between them. There may be substantial variations in the shape and design of nozzles, the jet span and gas pressure employed. The stripped matter simply flows downwardly from the stripping zone back to the bath. Jet stripping apparatus of the kind indicated above is hereinafter referred to as being "of the type described"
  • a common occurrence in the use of apparatus of the type described is that a thicker coating remains on or near the edges of the strip than on the remaining area of the strip.
  • the thicker coating may extend in from the edges by up to 30 millimeters but is normally confined to a marginal area 5 or 6 millimeters from the edge.
  • the present invention consists in apparatus for stripping excess coating liquid from an upwardly and vertically moving strip, of the kind comprising: means for directing a gas stream extending laterally of a coated surface of a strip onto said surface in a direction which is substantially normal thereto, a baffle plate at the region of impingement of said gas stream having a vertical portion presented to the edge of said strip and a non-vertical remainder portion below said vertical portion and trended away from said edge, a carrier plate having said baffle plate fixed along one edge of it, a carriage movable towards and away from said strip edge and having said carrier plate suspended from it, means urging said carriage to approach said strip edge and means to maintain a minimum spacing between said strip edge and said vertical portion so as to produce a substantially uniformly thick coating over the width of the strip; characterised in that an eductor is provided fixedly attached to said carrier plate with its intake end interrupting said vertical portion of said baffle plate adjacent said non-vertical remainder portion.
  • Figure 1 is a perspective view of part of the apparatus of the present invention.
  • Figure 2 is an end elevation taken on line 2-2 of figure 1 ;
  • Figure 3 is a section taken on line 3-3 of figure 2;
  • FIG. 1 there is shown a steel strip 1 which is rising vertically from a continuous hot dip coating bar and carrying an excess of coating liquid.
  • the strip 1 passes between a pair of linearly extending gas nozzles on either side of the strip for the removal of the excess coating in conventional fashion.
  • Such nozzles are well known and so are not shown in the drawings.
  • baffle 2 functioning to modify the flow of the stripping jets at the edge of the strip. Only one of the two baffles and its associated assembly is shown.
  • the baffle 2 consists of an elongate strip of sheet steel and has a straight vertical portion 3A and a non-vertical portion comprising a straight bottom 3B and an arcuate transition portion 3C.
  • the baffle 2 is fixedly attached to the edge of a carrier plate 4.
  • the carrier plate 4 is suspended on two hangers 5 having their upper ends fixed to a truck 6.
  • This truck is provided with rollers 7 and 8 so that it may run freely along a pair of opposed rails 9 as best shown in figure 2.
  • the truck 6 carries a yolk 10 for a roller 11 able to ride the edge of the strip 1.
  • an eductor 20 is provided secured to the carrier plate 4 such that the carrier plate 4 extends in a radial direction from either side of the eductor 20.
  • the eductor 20 is positioned so that its intake end opens through the vertical portion 3A of the baffle plate 2, adjacent the transition portion 3C.
  • the eductor as best shown in figure 3, comprises a length of tube 21 having an intake end 22, an exhaust 23 and a pressure input nozzle 24.
  • a flow from the intake 22 to the exhaust 24 of the eductor is generated.
  • Such flow causes suction at the intake 22.
  • pressurised air is supplied to the nozzle 24.
  • the resultant suction at the intake end which is disposed adjacent the edge of the strip 1 draws off excess coating metal from the edge of the strip and blows it from the exhaust 23.
  • the pressurised air supplied to the nozzle 24 is delivered through a pipe 25 which includes a flexible portion enabling the truck 6 to move.
  • the internal configuration of the eductor 20 includes a rounded intake lip 26 leading smoothly to a first internal bore portion 27 and thence to a second internal bore portion 28 being co-axially aligned with the first bore portion 27 and having a slightly greater internal diameter.
  • a smoothly contoured transitional step 29 interconnects the first bore portion 27 with the second portion 28.
  • the second bore portion 28 leads directly to the exhaust 23.
  • the arrangement is such that molten coating metal which contacts the walls of the first bore portion 27 is blown over the transitional steps 29 and from there directly to the exhaust 23 without contacting the sides of the second portion 28. It has been found that such an arrangement prevents build up of coating metal within the eductor 20.
  • L ex the length of the eductor from the nozzle 24 to the exhaust 23 (L ex ) is within the range 7 D to 12 D where D is the internal diameter of the first bore portion 27.
  • L ex should be 9.8 D.
  • the distance from the intake 22 to the strip edge 1 must be in the range from 8 mm to 0.6 D and the optimum distance from the nozzle 24 to the transitional step 29 is in the range 0,5 D to 1 D,
  • the nozzle 24 is 5 millimeters in diameter, and is inclined backwardly at an angle of 15° from the longitudinal axis of the eductor 20.
  • the distance from the intake 22 to the nozzle 24 is approximately 1.5 D.
  • the gauge pressure supplied to the nozzle 24 is approximately 400 kPa. (Gauge), and D is 24 millimeters.
  • the internal cross sectional shape of the eductor may be other than circular in which case D will be replaced with an hydraulic diameter that is four times the cross-sectional area of the first interval bore portion 27 divided by its peripheral length.
  • the eductor 20 is utilized when the strip speed falls below the critical strip speed.
  • eductor of the preferred embodiment includes first and second bore portions a plain bore eductor may be used.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Coating With Molten Metal (AREA)
  • Coating Apparatus (AREA)

Abstract

Appareil permettant l'élimination par jets de gaz d'une couche de liquide provenant d'une bande en mouvement (1) comprenant, à chaque bord de la bande, une plaque de déviation (3A, 3B, 3C) située sur une plaque de support (4) suspendue sensiblement dans le plan de la bande (1), à un chariot (6) capable de rouler sur des voies (9) vers la bande (1) jusqu'à ce qu'un rouleau tampon (11) entre en contact avec le bord de la bande (1). L'appareil comprend également un éjecteur (20) avec son axe dans le plan de la plaque de support (4), adapté pour retirer la couche excédentaire de la marge de la bordure de la bande (1).
PCT/AU1987/000382 1987-11-12 1987-11-12 Elimination du liquide d'enduction excedentaire d'une bande se deplaçant vers le haut et verticalement WO1989004381A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/AU1987/000382 WO1989004381A1 (fr) 1987-11-12 1987-11-12 Elimination du liquide d'enduction excedentaire d'une bande se deplaçant vers le haut et verticalement
JP50000587A JPH02502169A (ja) 1987-11-12 1987-11-12 上方かつ垂直に移動している細片材料からの余分なコーテング液の取出し

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/AU1987/000382 WO1989004381A1 (fr) 1987-11-12 1987-11-12 Elimination du liquide d'enduction excedentaire d'une bande se deplaçant vers le haut et verticalement

Publications (1)

Publication Number Publication Date
WO1989004381A1 true WO1989004381A1 (fr) 1989-05-18

Family

ID=3762891

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1987/000382 WO1989004381A1 (fr) 1987-11-12 1987-11-12 Elimination du liquide d'enduction excedentaire d'une bande se deplaçant vers le haut et verticalement

Country Status (2)

Country Link
JP (1) JPH02502169A (fr)
WO (1) WO1989004381A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU630281B2 (en) * 1991-03-06 1992-10-22 John Lysaght (Australia) Limited Jet stripping apparatus
EP1091810A1 (fr) * 1998-06-30 2001-04-18 Bhp Steel (Jla) Pty. Ltd. Ameliorations apportees a un appareil de stripping par jet
US6376020B1 (en) * 1997-05-19 2002-04-23 Bhp Steel (Jla) Pty. Ltd. Jet stripping apparatus
CN103380226A (zh) * 2011-09-22 2013-10-30 新日铁住金株式会社 擦拭装置及使用了它的热浸镀装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4596150B2 (ja) * 2005-05-27 2010-12-08 久治 大木 塗装物塗膜の溶融除去方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU453826B2 (en) * 1970-08-13 1974-09-26 John Lysaght (Australia) Limited Stripping excess coating liquid from moving strip material
AU543722B2 (en) * 1981-01-21 1985-05-02 John Lysaght (Australia) Limited Removing excess liquid coating from moving strip

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU453826B2 (en) * 1970-08-13 1974-09-26 John Lysaght (Australia) Limited Stripping excess coating liquid from moving strip material
AU543722B2 (en) * 1981-01-21 1985-05-02 John Lysaght (Australia) Limited Removing excess liquid coating from moving strip

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU630281B2 (en) * 1991-03-06 1992-10-22 John Lysaght (Australia) Limited Jet stripping apparatus
US6376020B1 (en) * 1997-05-19 2002-04-23 Bhp Steel (Jla) Pty. Ltd. Jet stripping apparatus
EP1091810A1 (fr) * 1998-06-30 2001-04-18 Bhp Steel (Jla) Pty. Ltd. Ameliorations apportees a un appareil de stripping par jet
EP1091810A4 (fr) * 1998-06-30 2003-05-28 Bhp Steel Jla Pty Ltd Ameliorations apportees a un appareil de stripping par jet
CN103380226A (zh) * 2011-09-22 2013-10-30 新日铁住金株式会社 擦拭装置及使用了它的热浸镀装置
AU2012310530B2 (en) * 2011-09-22 2016-07-07 Nippon Steel Coated Sheet Corporation Wiping device and hot dip coating apparatus using the same
US9708702B2 (en) 2011-09-22 2017-07-18 Nippon Steel & Sumitomo Metal Corporation Wiping device and hot dip coating apparatus using the same

Also Published As

Publication number Publication date
JPH02502169A (ja) 1990-07-19

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