Patent ID: 8771467

Claim:
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 adjusting the concentration of well-beaten pulp to between 0.65% and 0.85% and adding various auxiliary materials; wherein weights of paper waterproof agent, paper strength agent and bonding agent are added to the pulping materials for the surface layer to account for between 1% to 3%, between 3% to 5% and between 0.3% to 0.6% of the total respectively, wherein weights of softening agent and thermal-fusion bonding agent as added to the pulping materials for the intermediate layer account for between 0.5% to 1.5% and between 1% to 3% of the total respectively, and wherein weights of crosslinking agent and bonding agent as added to the pulping materials for the bottom layer account for between 0.5% to 1% of the total respectively, and subsequently, adjusting the pH to between 6.5 to 7.5 and stir the mixture evenly, then place it at between 25 degrees C. and 30 degrees C. for 30 minute to obtain the papermaking materials for the surface, intermediate and bottom layers; finally, proceed with screening, purification and deslagging prior to degassing; (3) a papermaking step comprising: proceeding with wire forming with multi-layer papermaking to obtain one or more surface, intermediate and bottom layers, and subsequently proceeding with bonding of wet paper in a sequence from surface-intermediate-bottom layers prior to pressing and drying; and (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.