A method includes (i) preparing a printing original plate sheet having an uncured photosensitive resin layer on a surface thereof, wherein compressive strength of the uncured photosensitive resin layer at 25 C. is 1.0 to 3.0 kgf/cm.sup.2; (ii) mounting the printing original plate sheet around a cylindrical support in such a manner that a starting terminal of the mounting and an ending terminal of the mounting are overlapped; and (iii) applying pressure to the overlapped area of the starting terminal of the mounting and the ending terminal of the mounting at a temperature range of 10 to 40 C. so as to pressure-bond the overlapped area. The method may further include, after the step (iii), a step (iv) for photo-curing the uncured photosensitive resin layer and may further comprise, after the step (iv), a step (v) for grinding, abrading and/or machining the overlapped area.

A method includes (i) preparing a printing original plate sheet having an uncured photosensitive resin layer on a surface thereof, wherein compressive strength of the uncured photosensitive resin layer at 25 C. is 1.0 to 3.0 kgf/cm.sup.2; (ii) mounting the printing original plate sheet around a cylindrical support in such a manner that a starting terminal of the mounting and an ending terminal of the mounting are overlapped; and (iii) applying pressure to the overlapped area of the starting terminal of the mounting and the ending terminal of the mounting at a temperature range of 10 to 40 C. so as to pressure-bond the overlapped area. The method may further include, after the step (iii), a step (iv) for photo-curing the uncured photosensitive resin layer and may further comprise, after the step (iv), a step (v) for grinding, abrading and/or machining the overlapped area.

Provided are a seamless cylindrical offset printing plate which enables seamless continuous printing to be performed, a manufacturing method therefor, and a reproduction processing method. The seamless cylindrical offset printing plate comprises: a cylindrical plate base material; a hydrophilic satin-like rough surface which is formed on a surface of the cylindrical plate base material; and a hydrophobic resist pattern part which is formed on the satin-like rough surface, wherein an exposed part of the satin-like rough surface serves as a non-printing area and the resist pattern part serves as a printing area.

Provided are a seamless cylindrical offset printing plate which enables seamless continuous printing to be performed, a manufacturing method therefor, and a reproduction processing method. The seamless cylindrical offset printing plate comprises: a cylindrical plate base material; a hydrophilic satin-like rough surface which is formed on a surface of the cylindrical plate base material; and a hydrophobic resist pattern part which is formed on the satin-like rough surface, wherein an exposed part of the satin-like rough surface serves as a non-printing area and the resist pattern part serves as a printing area.

A double-sided adhesive flexographic printing plate underlay for use in the manufacture and mounting of flexographic printing plates is provided. The underlay is carrier sheet with a solvent acrylic adhesive stripe-coating provided on both sides thereof. In addition, a siliconized release liner is provided to cover one of the coated sides of the carrier sheet. Both the carrier sheet and the release liner are formed from a glass clear polyethylene terephthalate (PET) and the solvent acrylic adhesive is transparent such that ultraviolent light can readily pass through the underlay. The construction of the underlay is such that it can withstand the washout conditions employed in the manufacture of both liquid and solid photopolymer flexographic printing plates.

A double-sided adhesive flexographic printing plate underlay for use in the manufacture and mounting of flexographic printing plates is provided. The underlay is carrier sheet with a solvent acrylic adhesive stripe-coating provided on both sides thereof. In addition, a siliconized release liner is provided to cover one of the coated sides of the carrier sheet. Both the carrier sheet and the release liner are formed from a glass clear polyethylene terephthalate (PET) and the solvent acrylic adhesive is transparent such that ultraviolent light can readily pass through the underlay. The construction of the underlay is such that it can withstand the washout conditions employed in the manufacture of both liquid and solid photopolymer flexographic printing plates.

Provided is to provide a cylindrical printing plate with which printing of excellent solid density and high halftone dot quality is made possible, and further print medium followability and printing durability are excellent, a cylindrical printing plate precursor, a method for manufacturing a cylindrical printing plate precursor, and a method for manufacturing a cylindrical printing plate. A cylindrical printing plate includes a relief layer having a first hard layer, a soft layer, and a second hard layer in this order from a printing surface side, in which a hardness K1 of the first hard layer is 10 MPa or more and less than 20 MPa, a ratio K1/K2 of the hardness K1 of the first hard layer with respect to a hardness K2 of the soft layer is 2.7 or more, a ratio K3/K2 of a hardness K3 of the second hard layer with respect to the hardness K2 of the soft layer is 1.2 or more, a thickness of the first hard layer is 0.05 mm or more and 0.3 mm or less, and a thickness of the soft layer is 0.3 mm or more and 2.0 mm or less.

Provided is to provide a cylindrical printing plate with which printing of excellent solid density and high halftone dot quality is made possible, and further print medium followability and printing durability are excellent, a cylindrical printing plate precursor, a method for manufacturing a cylindrical printing plate precursor, and a method for manufacturing a cylindrical printing plate. A cylindrical printing plate includes a relief layer having a first hard layer, a soft layer, and a second hard layer in this order from a printing surface side, in which a hardness K1 of the first hard layer is 10 MPa or more and less than 20 MPa, a ratio K1/K2 of the hardness K1 of the first hard layer with respect to a hardness K2 of the soft layer is 2.7 or more, a ratio K3/K2 of a hardness K3 of the second hard layer with respect to the hardness K2 of the soft layer is 1.2 or more, a thickness of the first hard layer is 0.05 mm or more and 0.3 mm or less, and a thickness of the soft layer is 0.3 mm or more and 2.0 mm or less.

An article with an operative liquid-bearing surface is adapted for transferring that liquid to a substrate material or printing plate. The entire operative surface of the article is provided with a pattern of microscopic discrete depressions which are usually laser-engraved into the surface so that a substantially continuous wall structure remains which surrounds and defines the depressions. In particular the depressions are of a cross-sectional shape which is symmetrical about one or both of a lateral and a medial axis perpendicular thereto, and arranged adjacent one another in offset fashion, and above and below one another so that the pattern thus formed is substantially uniform and repeating. Each of at least one of the pairs of lateral or medial sidewalls of any one depression are contoured, the contour of one of the pair being generally the mirror image of the other.

Provided is a planographic printing plate precursor including: a support; and an image recording layer formed on the support, in which the content of fine particles per unit area in a region on a plate surface on the image recording layer side from an end portion of the planographic printing plate precursor to a portion inside the end portion by 5 mm is greater than the content of the fine particles per unit area in a region other than the region by an amount of 10 mg/m.sup.2 or greater, edge stains are not generated therein, and transferring of the image recording layer is prevented even in a case where planographic printing plate precursors are stored in a stacked state. Further, provided are a method of producing the same and a printing method using the same.