# US 8,771,467 B2 · Carrier tape base paper making method and base paper made thereby > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,771,467 B2 - Document ID: US8771467B2 - Status: Granted - Kind: B2 - Application number: 14/115,624 - Filed: 2012-03-12 - Published: 2014-03-20 - Granted: 2014-07-08 - Earliest claimed: 2012-03-12 - Assignees: Zhejiang Jiemei Electronic & Technology Co., Ltd - Applicants: Junyun Fang - Inventors: Junyun Fang - Web page: https://patentgrep.com/patent/US8771467B2 ## CPC - D21H 27/30: Multi-ply (for surface covering D21H27/18; making on paper-making machines D21F9/00, D21F11/00) - D21H 27/00: Special paper not otherwise provided for, e.g. made by multi-step processes - D21H: PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR ## Abstract A carrier-tape base paper making method and the base paper made thereby fall into the technical field of papermaking. According to performance requirements, the base paper is made through pulp conditioning and papermaking, in which different pulping and auxiliary materials for surface, intermediate and bottom layers are added. The method includes such steps as beating, conditioning, papermaking, calendering and reeling. The carrier-tape base paper features high strength, perfect waterproof and bonding performance, limited physical damages to electronic elements and satisfactory resilience. ## Claims ### Claim 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 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. ### Claim 2 (depends on 1) A method according to claim 1 wherein: the paper waterproof agent is selected from at least one of alkyl ketene dimer, rosin resin and tripalmitin; the paper strength agent is selected from at least one of polyacrylamide, sodium polyacrylate, chitin and polyaminoamide; the bonding agent is selected from at least one of starch, modified starch, guar gum and carboxymethyl cellulose; the softening agent is selected from at least one of silicon quarternium, polysiloxane and fatty acid alkyl ethoxylate; the thermal-fusion bonding agent is selected from at least one of polyester, polyurethane, polyvinyl alcohol, polystyrene and polyacrylate; and the crosslinking agent is selected from at least one of melamine, polyamide, biformyl and borax. ### Claim 3 (depends on 1) A method according to claim 1, wherein the step of the polishing and rolling comprises using a hot roller between 100 and 100 degrees C. to form a damp proof layer on a surface of the base paper. ### Claim 4 (depends on 3) A method according to claim 3, wherein a water injector is used to spray water on the surface layer at a working capacity of between 1 and 2 g/m2 before pressing with a hot roller to form a moisturized layer. ### Claim 5 (depends on 1) A method according to claim 1, wherein between 1% and 3% polyvinyl alcohol and between 0.01% and 0.03% aluminum sulfate are added to the pulping material for the surface layer during the step of pulp conditioning. ### Claim 6 (depends on 1) A method according to claim 1, wherein at least one surface layer formed with net is coated with between 0.5% and 1% starch and between 0.02% and 0.5% urea formaldehyde resin during papermaking. ### Claim 7 (depends on 1) A method according to claim 1, wherein one or more bottom layers as formed with net is sprayed or coated with between 0.5% and 1% anionic polyacrylamide and between 0.02% and 0.5% starch during papermaking. ### Claim 8 A carrier-tape base paper having surface, intermediate and bottom layers formed through papermaking, the carrier-tape base paper made by a 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 between 42 and 45 degrees SR, between 48 and 50 degrees SR and between 38 and 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% and 3%, between 3% and 5% and between 0.3% and 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% and 1.5% and between 1% and 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% and 1% of the total respectively, and subsequently, adjusting the pH to between 6.5 and 7.5 and stir the mixture evenly, then place it at between 25 degrees C. and 30 degrees C. for 30 minutes 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, wherein the carrier-tape base paper comprises a rated 105 to 125 g/m2 surface layer, a rated 200 to 500 g/m2 intermediate layer, and a rated 165 to 185 g/m2 bottom layer; wherein, according to the performance requirements of each layer, different paper pulp raw materials are employed for the surface layer, intermediate layer and bottom layer, and different auxiliary materials are added for conditioning the pulp and making the paper; wherein the tensile strength, surface strength expressed in critical wax strength grade and water resistance of the surface layer is 6.5 to 8.5 kN/m, 16 A to 18 A and not less than 600 s respectively; wherein the softness of the intermediate layer is 100 and 150 mN; wherein paper powder generation measured with an experimental method of taper friction loss is below 100 ppm; wherein stiffness of the bottom layer is between 25 and 40 mN; and wherein the interlayer bonding strength measured with a Scott internal bonding strength tester is not less than 150 J/m2. ### Claim 9 (depends on 8) A carrier-tape base paper according to claim 8, wherein the intermediate layer comprises 3-7 layers of copy paper, and the surface and bottom layers comprise 1 to 3 layers of copy paper. ### Claim 10 (depends on 8) A carrier-tape base paper according to claim 8, wherein the smoothness of the surface and bottom layers is not less than 5 s.