Patent ID: 6571700
Filing Date: 2003-06-03
Classification: B41C,B41J,Y10T

Abstract:
A method of making a stencil by thermally forming perforations arranged in both a main scanning direction and a sub-scanning direction in a thermoplastic resin film of heat-sensitive stencil material by the use of a heat source which is heated through a supply of energy, the method comprising the steps of:cutting the supply of energy to the heat source when a time interval not shorter than 50% and not longer than 100% of an estimated perforating time lapses from the time at which the supply of energy to the heat source is started, the estimated perforating time being a time interval expected to be necessary for a perforation to be produced by the heat of the heat source and to be enlarged to a desired final size, the time interval of the estimated perforating time being measured from the time at which the supply of energy to the heat source is started, in which the estimated perforating time is set to be a time t2 represented by formula BA&it;â€ƒ&it;exp&af;(Ct2)=4100,when a graph of the diameter of the perforation against the time from the time at which supply of energy to the heat source is started, is regressed on an exponential function A-Bexp&af;(Ct),wherein A, B and C are positive constants.