Process for the manufacture of abrasives

Details Process for the manufacture of abrasives Process for the manufacture of abrasives

C - Chemistry, Metallurgy

09

K

57/7

C09K 3/14 (2006.01) B24D 3/28 (2006.01) C08G 8/08 (2006.01) C08G 8/24 (2006.01) C08L 61/06 (2006.01) C08L 61/10 (2006.01)

Patent

CA 1143167

HOE 78/A 016 Abstract A process for the preparation of an abrasive material having two binder layers which comprises the steps (i) applying a first binder layer to a flexible sheet-like support; (ii) scattering abrasive particles onto the said first binder layer; (iii) drying the product of step (ii) in a horizontal drying unit and subsequently cooling the product in a air stream, the drying process being effected so that the said first binder layer attains sufficient adhesive strength to prevent displacement of the abrasive particles therein when the product is cooled; (iv) applying a second binder layer as sizer to the cooled product of step (iii); (v) drying the said second binder layer in a horizontal drying unit and subsequently cooling the product, heating and cooling being performed in a similar manner to that of step (iii), the drying process being effected so that the said second binder layer becomes imprint resistant; (vi) loosely rolling up the product of step (v); and (vii) curing the product of step (vi) wherein at least one of the said binder layers comprises at least one aqueous monohydric phenol resol I (molar ratio of phenol: formaldehyde l:(l.l - 2.5) wherein the heating and cooling are performed by means of air-stream through slit nozzles equipped transversely to the course direction of the product and wherein the coated carrier material is conveyed with a speed of about 5 m/min through the drying unit which has well defined, independently controllable heating and cooling zones and wherein the air stream has a speed between 5 and 200 m/sec at the slit nozzles and an outlet temperature between 20 and 300°C dependent on the temperature zone and wherein the air is drawn off with adjacent suction nozzles.

341737

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