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1. WO1996006429 - METHOD AND APPARATUS FOR SMOOTHING GRAVURE COATINGS IN THE MANUFACTURE OF MAGNETIC RECORDING TAPE

Publication Number WO/1996/006429
Publication Date 29.02.1996
International Application No. PCT/US1995/008588
International Filing Date 11.07.1995
Chapter 2 Demand Filed 17.02.1996
IPC
B05C 11/02 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
05SPRAYING OR ATOMISING IN GENERAL; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
CAPPARATUS FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
11Component parts, details or accessories not specifically provided for in groups B05C1/-B05C9/132
02Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface; Control of the thickness of a coating
G11B 5/842 2006.01
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
84Processes or apparatus specially adapted for manufacturing record carriers
842Coating a support with a liquid magnetic dispersion
CPC
B05C 11/028
BPERFORMING OPERATIONS; TRANSPORTING
05SPRAYING OR ATOMISING IN GENERAL; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
CAPPARATUS FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
11Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
02Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; ; Controlling means therefor
023Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface
028with a body having a large flat spreading or distributing surface
G11B 5/842
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
84Processes or apparatus specially adapted for manufacturing record carriers
842Coating a support with a liquid magnetic dispersion
Applicants
  • MINNESOTA MINING AND MANUFACTURING COMPANY [US/US]; 3M Center P.O. Box 33427 Saint Paul, MN 55133-3427, US
Inventors
  • MUNTER, John, D.; US
  • LEWIS, Donald, M.; US
  • STENSTROM, Scott, D.; US
Agents
  • LEVINE, Charles, D. ; Minnesota Mining and Manufacturing Company Office of Intellectual Property Counsel P.O. Box 33427 Saint Paul, MN 55133-3427, US
  • HILLERINGMANN, Jochen; Bahnhofsvorplatz 1 (Deichmannhaus) D-50667 Köln, DE
Priority Data
08/293,48122.08.1994US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) METHOD AND APPARATUS FOR SMOOTHING GRAVURE COATINGS IN THE MANUFACTURE OF MAGNETIC RECORDING TAPE
(FR) PROCEDE ET APPAREIL POUR LE LISSAGE DE COUCHAGES PAR GRAVURE DANS LA FABRICATION DE BANDES D'ENREGISTREMENT MAGNETIQUES
Abstract
(EN)
A wet gravure coating of fine magnetizable particles can be smoothed by a rectangular piece of flexible film (19) that is secured at one end in flat jaws (26a, 26b) of a clamp (20) to leave its opposite end (18) free to drag against the coating, thus causing the flexible film (19) to form an arc between its secured end and the convergence of the flexible film (19) with the wet coating. The jaws also secure a flat plate (21) which has an edge which is transversely convex across the width of the flexible film or a stiff flexible sheet that deflects the arcuate portion of the flexible film (19) toward the coating along a line extending transversely across the full width of the flexible film. The plate (21) can be repositioned during the smoothing to adjust the radius of curvature of the arc in order to correct any defects that may appear in the smoothed coating. When the backing web is wide and is advanced at economically high speeds, the free end of the flexible film can be tensioned so that its trailing edge becomes bowed and in contact with the coating over its full width.
(FR)
Un couchage par gravure au mouillé, fait de fines particules magnétisables, peut être lissé par une pièce rectangulaire d'un film flexible (19), qui est fixé par l'une de ses extrémités dans des mâchoires plates (26a, 26b) d'une pince (20), afin de laisser son extrémité opposée (18) libre de frotter contre le couchage, amenant ainsi le film flexible (19) à former un arc entre son extrémité fixée et le point de rencontre du film flexible (19) avec le couchage humide. Lesdites mâchoires servent également à fixer une plaque plate (21) qui présente un bord, transversalement convexe sur la largeur du film flexible ou d'une feuille flexible rigide, ce bord venant dévier la partie courbe du film flexible (19) en direction du couchage le long d'une ligne s'étendant transversalement sur toute la largeur du film flexible. Ladite plaque (21) peut être repositionnée pendant l'opération de lissage, afin d'ajuster le rayon de courbure dudit arc, de façon à corriger tout défaut pouvant apparaître dans le couchage lissé. Lorsque la bande de support est large et qu'elle est amenée à avancer à des vitesses économiquement élevées, l'extrémité libre du film flexible peut être tendu, pour que son extrémité de queue se courbe et vienne en contact avec le couchage sur toute sa largeur.
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