| 摘要 |
<p>PURPOSE:To enable the printing of a clear mark without peeling of paper by printing a graphic employing an ink containing an additive for prevention of paper peeling in the printing of a cutting position mark on a wet long rolled paper watermarked at the fixed position. CONSTITUTION:A cutting mark is printed on a bond paper or the like as wet paper at the fixed position with respect to the watermark in the paper making process. To produce the ink herein used, a hardened rosin resin is arranged in a solvent of butyl triglycol at the ratio of 1:1 and the mixture is heated upto 200 deg.C to melt the resin to obtain a vehicle with the viscosity of about 20 poise. Then, the vehicle and a black pigment of a coloring agent comprising carbon black are kneaded at the 20% density of the pigment with three roll mills, all of insufficient components are added thereto to meet the requirements of: 70pts. in the solvent, 20pts. in the resin, 3pts. as antipeeling additive in the dioctyl phthalate and 7pts. in the coloring agent and the mixture is stirred at a high speed. The use of the ink enables the printing of a cutting mark very clearly on the wet paper employing a letterpress system without causing any peeling thereby improving the cutting accuracy.</p> |
