Paper feed roller and method of manufacture

A paper feed roller for use in printing machines, comprising:

• a rotary shaft, and
• a cylindrical roller portion integrated with an outer periphery of the rotary shaft and formed by connecting a plurality of cylindrical molded bodies in a direction of the rotary shaft;
• wherein the cylindrical roller portion comprises a hydraulic composition comprising a hydraulic powder and a non-hydraulic powder and a workability improver,
• and said non-hydraulic powder is at least one selected from the group consisting of calcium carbonate powder, slug powder, fly ash powder, silica powder and silica fume powder, and said workability improver is one of a powder and an emulsion of at least one resin selected from the group consisting of:
• vinyl acetate resin, a copolymer resin with vinyl acetate, acrylic resin, a copolymer resin with acryl, styrene resin, a copolymer resin with styrene, and an epoxy resin.

A method for producing a paper feed roller for use in printing machines, comprising the steps of:

• forming a plurality of cylindrical molded bodies, each of which bodies having a hole at a center portion, by press molding, releasing, curing and hardening, hydraulic composition comprising a hydraulic powder and a non-hydraulic powder and a workability improver,
• inserting a rotary shaft through the holes of the plurality of cylindrical molded bodies, and
• connecting adjacent said cylindrical molded bodies, and thereby integrally forming a cylindrical roller portion around an outer peripheral surface of the rotary shaft;
• wherein said non-hydraulic powder is at least one selected from the group consisting of calcium carbonate powder, slug powder, fly ash powder, silica powder and silica fume powder, and the workability improver is one of a powder and an emulsion of at least one resin selected from the group consisting of:
• vinyl acetate resin, a copolymer resin with vinyl acetate, acrylic resin, a copolymer resin with acryl, styrene resin, a copolymer resin with styrene, and an epoxy resin.

A method for producing a paper feed roller for use in printing machines, comprising the steps of:

• forming a plurality of cylindrical green press molded bodies each having a hole at a central portion by press molding a mixture of a hydraulic composition comprising a hydraulic powder and a non-hydraulic powder and a workability improver,
• releasing the cylindrical green press molded bodies,
• inserting a rotary shaft through the holes of the plurality of the cylindrical green press molded bodies,
• connecting adjacent said cylindrical green press molded bodies, and
• forming a cylindrical shaped body through curing and hardening the connected cylindrical green press molded bodies, so as to integrally form a cylindrical roller portion around an outer peripheral surface of the rotary shaft;
• wherein said non-hydraulic powder is at least one selected from the group consisting of calcium carbonate powder, slug powder, fly ash powder, silica powder and silica fume powder, and the workability improver is one of a powder and an emulsion of at least one resin selected from the group consisting of:
• vinyl acetate resin, a copolymer resin with vinyl acetate, acrylic resin, a copolymer resin with acryl, styrene resin, a copolymer resin with styrene, and an epoxy resin.

A method for producing a paper feed roller for use in printing machines, comprising the steps of:

• forming a cylindrical roller portion from a cylindrical press molded body shaped through press molding, releasing, curing and hardening a hydraulic composition comprising a hydraulic powder and a non-hydraulic powder and a workability improver,
• arranging two rotary shaft portions to be concentric with an outer peripheral surface of the cylindrical roller portion, and
• attaching the two rotary shaft portions to opposite end portions of the cylindrical roller portion, the two rotary shaft portions being aligned with each other, so as to form a rotary shaft by the two rotary shaft portions;
• wherein said non-hydraulic powder is at least one selected from the group consisting of calcium carbonate powder, slug powder, fly ash powder, silica powder and silica fume powder, and the workability improver is one of a powder and an emulsion of at least one resin selected from the group consisting of:
• vinyl acetate resin, a copolymer resin with vinyl acetate, acrylic resin, a copolymer resin with acryl, styrene resin, a copolymer resin with styrene, and an epoxy resin.

A method for producing a paper feed roller for use in printing machines, comprising the steps of:

• press molding a hydraulic composition comprising a hydraulic powder and a non-hydraulic powder and a workability improver to produce cylindrical green press molded bodies,
• releasing the cylindrical green press molded bodies,
• forming a cylindrical roller portion from the cylindrical green press molded bodies,
• arranging two rotary shaft portions to be concentric with an outer peripheral surface of the cylindrical roller portion, and
• attaching the two rotary shaft portions to opposite end portions of the cylindrical roller portion, the two rotary shaft portions being aligned with each other, so as to form a rotary shaft by the two rotary shaft portions, and
• curing and hardening the cylindrical roller portion while arranged on the rotary shaft;
• wherein said non-hydraulic powder is at least one selected from the group consisting of calcium carbonate powder, slug powder, fly ash powder, silica powder and silica fume powder, and the workability improver is one of a powder and an emulsion of at least one resin selected from the group consisting of:
• vinyl acetate resin, a copolymer resin with vinyl acetate, acrylic resin, a copolymer resin with acryl, styrene resin, a copolymer resin with styrene, and an epoxy resin.

A method for producing a paper feed roller, comprising the steps of:

• forming a plurality of cylindrical molded bodies by press molding a mixture of a hydraulic composition comprising a hydraulic powder and a non-hydraulic powder and a means for improving moldability and mold-releasability of the cylindrical molded bodies, each of the cylindrical molded bodies having a hole at a central portion through molding the hydraulic composition,
• releasing, curing and hardening the molded bodies,
• inserting a rotary shaft through the holes of the plurality of cylindrical molded bodies, and
• connecting adjacent said cylindrical molded bodies, and thereby integrally forming a cylindrical roller portion around an outer peripheral surface of the rotary shaft.