Process and equipment for micropattern forming on roll surface, metal sheets for pressworking prepared by the roll and methods of preparing same

Claim 2

A process as claimed in claim 1 wherein the film has a thickness of from 1 to 10µm.

Claim 3

An apparatus for carrying out the method of claim 1 or 2 comprising: (a) means for supporting and rotating the rolling roll, (b) means for coating the acid corrosion-resistant material onto the rolling roll, (c) a laser plotter comprising a laser oscillator for irradiating the coating in a pulse-like manner in response to an electrical signal, and means for guiding and focusing the laser onto the coating, (d) means for applying an etching solution to the surface of the rolling roll, (e) means for moving, independently or simultaneously, the laser plotter, the coating means and the etching means in the axial direction of the rolling roll. (f) an image processing device for providing a pattern to be formed on the roll surface, reducing the pattern to a plurality of dots to make a binary encoding and to make a series of plot data, and (g) a control means for controlling the pulse emitting time of the laser plotter in response the plot data and to a signal sent from a means for detecting the rotational angle of the rolling roll.

Claim 4

An apparatus as claimed in claim 3 wherein: the laser plotter is provided with a YAG laser oscillator, a first optical modulator disposed between two resonant mirrors in the laser oscillator and a second optical modulator disposed in the midway of the laser beam path out of the laser oscillator; the roll rotating means is provided with a device, comprising a rotary encoder, for detecting the rotational angle of the rolling roll; the control device includes a first optical modulator driver for driving the first optical modulator in response to a clock signal from the rotary encoder and a second optical modulator driver for driving the second optical modulator in response to portions of the clock signal, provided with reference to the plot data, corresponding to dots for the required micro-pattern.

Claim 5

An apparatus as claimed in claim 4 wherein the laser plotter is provided with a plurality of second optical modulators and is further provided with a spectroscope, disposed between the laser oscillator and the second optical modulators, adapted to divide the laser beam into a plurality of lines corresponding to the number of second optical modulators.

Claim 6

A rolling roll produced by means of a process according to any preceding claim and comprising a surface pattern including flat topped independent trapezoid projections and/or flat topped containers net-like projections.

Claim 8

A method as claimed in claim 7 wherein the rolling roll comprises flat topped continuous net like projections having an aperture larger than the sum of a width the a pitch of the independent trapezoid projections of the other rolling roll.

Claim 9

A method according to claim 7 or 8 wherein the metallic sheet is skin pass rolled at a reduction rate of 0.3 to 2%.

Claim 10

A metallic sheet prepared by the method of any of claims 7 to 9 comprising independent pond-like indentations arranged at specific locations and continuous net-like groove-like indentations enclosing the circumferences of the pond-like indentations.

Claim 11

A metallic sheet prepared by the method of any of claims 7 to 9 comprising independent pond-like indentations arranged at first regions of the sheet surface and continuous net-like groove-like indentations arranged at second regions of the sheet surface.