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1. WO1996006430 - DIFFERENTIAL-SPEED GRAVURE COATING OF MAGNETIZABLE LAYERS IN THE MANUFACTURE OF MAGNETIC RECORDING MEDIA

Publication Number WO/1996/006430
Publication Date 29.02.1996
International Application No. PCT/US1995/008681
International Filing Date 11.07.1995
Chapter 2 Demand Filed 27.02.1996
IPC
B05C 1/08 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
1Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
04for applying liquid or other fluent material to work of indefinite length
08using a roller
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 1/0856
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
1Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
04for applying liquid or other fluent material to work of indefinite length
08using a roller ; or other rotating member which contacts the work along a generating line
0856Reverse coating rollers
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
  • LAM, Joseph, H.; US
  • KUCK, Kevin, J.; US
  • BROST, Michael, J.; US
  • GEHRKE, Norman, E.; 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 Cologne, DE
Priority Data
08/294,07922.08.1994US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) DIFFERENTIAL-SPEED GRAVURE COATING OF MAGNETIZABLE LAYERS IN THE MANUFACTURE OF MAGNETIC RECORDING MEDIA
(FR) COUCHES MAGNETISABLES APPLIQUEES PAR COUCHAGE PAR GRAVURE A VITESSE DIFFERENTIELLE DANS LA FABRICATION DE SUPPORTS D'ENREGISTREMENT MAGNETIQUES
Abstract
(EN)
A magnetizable layer can be applied to a flexible backing web (14) by gravure coating at high speeds by independently driving the backing web at a speed that is substantially different from the surface speed of the gravure roll (12). Especially high coating speeds have been achieved when the gravure roll (12) rotates oppositely to the direction in which the backing web (14) is advancing. In one embodiment, a nip roll (34) presses the backing web (14) against the backup roll (15, 30), there is a gap between the gravure roll (12) and a backup roll (15, 30), and an idler roll (17) is positioned downstream of the gap to force the backing web (14) into contact with the gravure roll (12) over a short arc. When that backup roll (30) has a hard surface such as metal, its surface can be machined with precision, and that precision can be maintained in spite of exposure to solvent vapors.
(FR)
Une couche magnétisable peut être appliquée sur une bande de support flexible (14) par couchage par gravure à des vitesses élevées par entraînement indépendant de la couche de support à une vitesse qui soit sensiblement différente de la vitesse de surface du rouleau à gravure (12). En particulier, on obtient des vitesses de couchage élevées, en faisant tourner le rouleau à gravure (12) dans une direction opposée à la direction d'avance de la bande de support (14). Dans un mode de réalisation, un rouleau pinceur (34) presse la bande de support (14) contre le rouleau presseur (15, 30); un espace libre est prévu entre le rouleau à gravure (12) et un rouleau presseur (15, 30); et un rouleau non commandé (17) est disposé en aval de cet espace libre, pour forcer la bande de support (14) à venir en contact avec le rouleau à gravure (12) sur un arc court. Lorsque le rouleau presseur (30) est conçu avec une surface dure, par exemple du métal, sa surface peut être usinée avec précision et cette précision peut être maintenue en dépit de toute exposition à des vapeurs de solvant.
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