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Surface treatment method and apparatus for support of lithographic plate

Image Number 2 for United States Patent #6273784.

There is provided at least one of a moving device for moving a graining brush in the width direction of aluminum web and a turning device for turning the graining brush so that the graining brush can be placed obliquely against a transporting direction of the aluminum web. By moving the graining brush periodically in the width direction of the aluminum web, the entire graining brush uniformly comes into contact with the aluminum web. By turning the graining brush to place it obliquely against the transporting direction of the aluminum web, the entire graining brush can always come into contact with the aluminum web. Accordingly, the abrasion in the bristles of the graining brush is maintained uniform.

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