Patent ID: 8771467
Filing Date: 2014-07-08
Classification: D21H

Abstract:
1. A method of making a carrier-tape base paper, the paper having surface, intermediate and bottom layers formed through papermaking, the method comprising: (1) a beating step comprising mixing and breaking pulping materials for surface, intermediate and bottom layers into surface, intermediate and bottom pulps prior to beating to the degree of 42 to 45 degrees SR, 48 to 50 degrees SR and 38 to 40 degrees SR respectively; (2) a pulp conditioning step comprising (3) a papermaking step comprising: (4) polishing and rolling, wherein: the pulping material for the surface layer in the beating step comprises between 45% and 65% sulfate softwood pulp and between 35% and 55% sulfate hardwood pulp; the pulping material for the intermediate layer comprises between 30% and 50% sulfate softwood pulp and between 55% and 75% sulfate hardwood pulp; and the pulping material for the bottom comprises between 20% and 40% sulfate softwood pulp and between 65% and 80% sulfate hardwood pulp.