171results about "Printing roller shells" patented technology

A method of forming a photopolymer layer on a printing substrate (e.g., flexographic printing sleeves and cylinders) is provided. The method includes providing a photopolymer composition that contains a photopolymer and at least one monomer bonded to the photopolymer. The monomer can help reduce the hardness of the resulting photopolymer composition. In addition, the method also includes spraying the photopolymer composition onto a rotating generally cylindrical surface of the printing substrate. In one embodiment, the sprayed photopolymer composition is then cured. The resulting photopolymer layer is seamless and continuous and, in some embodiments, has a hardness of between about 50 to about 70 Shore A.

An industrial roll includes: a substantially cylindrical metallic core; a rubber base layer that is adhered to and circumferentially overlies the core; a rubber top stock layer that circumferentially overlies the base layer; and a polyurethane coating that circumferentially overlies the top stock layer. In this configuration, the roll can provide improved abrasion-resistance, sheet release properties, and/or toughness compared to a roll with a rubber cover, but may provide these properties in a cover that is softer than a typical polyurethane cover.

A fiber-reinforced plastic base body is first of all provided with a coating of hard rubber or thermoplastic having a dispersed metal or ceramic content of 5% by volume to 80% by volume, and the coating is ground down to provide a smooth surface In a further step a layer of metal and/or ceramic, which has a printing function, is applied to the smooth surface, preferably by thermal spraying.

A rubber roller formed by molding an elastomer composition not less than 250 μs nor more than 400 μs in a T2 relaxation time (spin-spin relaxation) of a bound rubber formed between a rubber and/or a thermoplastic elastomer and a reinforcing filler. EPDM can be used as the rubber and/or the thermoplastic elastomer, carbon black as the reinforcing filler, and an organic peroxide as a crosslinking agent. The T2 relaxation time (spin-spin relaxation) of the bound rubber formed between the rubber and/or thermoplastic elastomer and the reinforcing filler is more than a T2 relaxation time of a bound rubber of the rubber and/or thermoplastic elastomer to which the reinforcing filler is not added by not less than 150% nor more than 300%.

A fluid metering roll such as an anilox roll is comprised of a tubular carbon fiber composition core having one or more metallic layers intervening between the core and a surface layer comprised of ceramic, the ceramic having outwardly opening fluid metering cells. The method of forming the roll includes steps of thermal spray applying one or more layers comprised of metal over the roll surface the layers intervening between the roll and an external ceramic coating. Characterizing features of the application method reside in each of the thermal spray applied layers being directed toward the core at a negative rake angle of from about 11½ to about 13½ and preferably 12½°, the core and layers which receive the thermal spray being simultaneously cooled to about 110° Centigrade or less during application of the thermal spray. The method and article are further characterized in that the coefficient of thermal expansion of the layers intervening between the core and the outermost ceramic layer form a progression whereby the intermediate layers have thermal characteristics which progressively become smaller in the outward direction.

A replaceable sleeve having a working surface is provided which is adapted to be mounted on a carrier. The sleeve includes an inner polymeric layer, a reinforcing layer overlying the inner layer, an intermediate polymeric layer overlying the reinforcing layer, and an outer polymeric layer. The sleeve may include a cushion layer between the intermediate layer and the outer layer. The layers comprising the sleeve are formed around a support and then cured simultaneously in a single step. The resulting sleeve may be used in printing operations or in other applications such as coating, embossing, laminating, calendering and the like.

A method of manufacturing an anilox roller, in particular for a flexographic printing press, the anilox roller comprising a cylindrical core and a sleeve detachably held on the core and having at its surface an anilox layer with a grid pattern of pits, comprising the steps of mounting the sleeve on the core, and then forming the anilox layer on the sleeve

The invention relates to the field of printing, in particular to an improved type ceramic anilox roller and a preparation method thereof. Anilox is arranged on a ceramic surface layer of the ceramic anilox roller and consists of a plurality of meshes which are the same and are arranged regularly, the cross section of each mesh is in the shape of a stretched hexagon, the stretched hexagon is a hexagon which is obtained by lengthening two opposite sides of a regular hexagon by the same length, and the stretched hexagon consists of two stretched sides and four non-stretched sides. When the improved type ceramic anilox roller is used, color difference is not easily caused, a coating quantity is stable, ink blockage is not easily caused, a printing ink covering effect can be improved, printingink transfer performance is good, the printing effect is good, and the meshes are easily cleaned. Compared with a traditional regularly hexagonal anilox roller, the improved type ceramic anilox rollerhas the advantages that the ink loading amount and transfer rate of the improved type ceramic anilox roller are remarkably higher than the ink loading amount and transfer rate of the traditional regularly hexagonal anilox roller under the condition of the same screen, the wear resistance is good, and the service life is long; and the preparation method is simple in process, an operation process is easily controlled, the quality of products is stable, and thus, the improved type ceramic anilox roller is suitable for industrial production.

A method of making rollers with a fine pattern has the acts of casting a ceramic layer onto a roller surface, grinding and polishing the roller surface, forming a pattern on the roller surface with laser, and cleaning the roller surface. Therefore, the roller thus made has a pattern with higher precision than the conventional method of mold casting. Since the roller surface has a ceramic layer that has better resistance to erosion than steel, the roller has a longer lifetime.

The invention relates to an anilox roll for a printing apparatus. The anilox roll comprises a cylinder having a surface. The surface comprises a fluid distribution structure for receiving, distributing and transferring a fluid such as an ink. The fluid distribution structure comprises a channel formed in the surface having channel walls. This channel is arranged for distributing the fluid over the fluid distribution structure. The channel comprises channel parts, wherein the courses of connected channel parts are at an angle with respect to each other for preventing a linear distribution of the fluids to be received in a course direction of the channel, allowing a meandering distribution of the fluid to be received in the channel. Side walls of the channel are arranged for allowing a meandering flow of the fluid throughout the fluid distribution surface.

A quick release roller sleeve and mounting hub assembly is described for use with high speed roller machines. The assembly includes an outer flange plate that can be detached from the assembly in order for the roller sleeve to be dismounted and a new roller sleeve mounted as the existing roller sleeve becomes worn and needs to be replaced. The quick release permits the mounting hub and other parts of the assembly to remain in their aligned configuration and positions while only exchanging the roller sleeve portion of the assembly.

The invention relates to an on-press developing treatment-free thermal-sensitive plate with a nano-micron-structure protective layer. The on-press developing treatment-free thermal-sensitive plate comprises an aluminum plate base support, a coating layer containing a negative image light-sensitive composition and the protective layer with a nano-micron structure, all of which are distributed frombottom to top. The aluminum plate base support is subjected to electrolytic roughening, anodic oxidation and hole sealing treatment, wherein the average roughness of center lines ranges from 0.4 micron to 0.6 micron; the negative image light-sensitive composition mainly contains discrete nano-micron particles, diurethone prepolymer, multi-functional-group monomers, a thermal polymerization initiator and an infrared absorbent; and the diameter of the discrete nano-micron particles in the protective layer with the nano-micron structure ranges from 50 nm to 150 nm. The protective layer which is hydrophilic but insoluble in water and has the nano-micron structure is adopted, the problems that a fountain solution is contaminated by the protective layer, and the normal-temperature permeability of a formed film is poor are solved, the plate on-press developing capacity is improved, the number of plate passing paper is greatly reduced, plates can be directly subjected to on-press printing, high durability is achieved, and environment-friendly printing is achieved.

A transport roller includes: a roller body of which a pair of end surfaces face each other by a press work so as to be in a cylindrical shape; and a high friction layer which contains inorganic particles and is provided on a surface of the roller body. Here, the roller body is provided with a joining portion which is formed by separating the pair of end surfaces. In addition, an average particle diameter of the inorganic particle is larger than a distance between the pair of the end surfaces of the roller body on an outer peripheral surface side thereof.

A transfer roller is used in an electrophotographic printer. The transfer roller rotates in contact with a rotating photoconductive drum with a print medium travelling therebetween. The transfer roller has a metal shaft around which a rubber roller is formed. The rubber roller is sponge-like and electrically semiconductive. The rubber roller is covered with a resin tube which has a lower layer formed on the rubber roller and an upper layer formed on the lower layer. One of the upper and lower layers has a higher sealing effect than the other of the upper and lower layers, and the other of the upper and lower layers has a higher stability of electrical resistance than the one of the upper and lower layer.

A support sleeve made of a metallic material, preferably of nickel, is provided at at least one longitudinal end with a chamfer running all around in the inner circumference. This prevents damage to a film-like coating or thin intermediate sleeve, which surrounds the cylinder core to which the sleeve is fitted. A device for chamfering and deburring the longitudinal ends of the sleeve include a supporting body having a cylindrical journal with a diameter only slightly smaller than the internal diameter of the sleeve to be machined, in order to accommodate a longitudinal end of the sleeve and to guide the cut. A cutting holder is machined on the supporting body by means of which holder a cutter can be brought up to the inner circumference of the longitudinal end of the sleeve to be machined, and the supporting body can be rotated relative to the sleeve to be machined and pushed onto the journal.

The invention is a simple, inexpensive, wash-free integrated cover for a printing transfer cylinder (preferably, but not necessarily, in a Komori press), comprising a flexible jacket covering permanently attached to a cylinder base cover. The invention provides advantages over T-Y paper and non-tack film in that dampening solution, washing, and cleaning causes failure in both over time, whereas dampening solution is beneficial to the present invention as such is retained in the flexible jacket cover and helps to prevent ink buildup and marking. The flexible jacket covering is moveable relative to the cylinder base cover, thereby further reducing ink buildup and marking. The integrated cover is disposable, which reduces periodic maintenance and cleaning of the transfer cylinder coverings and provides for fresh, clean substrate support surfaces upon each new installation. The flexible jacket covering and cylinder base cover are integrated into a single, convenient unit, thereby speeding and simplifying installation.

A cushion for printing or a cushioning layer for printing plate manufactured using a cushioning material for printing having a storage elastic modulus (E′) of 1.0×10⁸ Pa or greater at 20° C. and 1000 Hz enables high-speed printing while keeping a printing quality.

A method for manufacturing and regenerating a functional surface of an anilox sleeve or anilox roller for a printing machine with a coating protecting against wear and corrosion. The anilox sleeve is preferably made out of a lightweight plastic on which an intermediate layer is applied and has a metal tube located above the intermediate layer. During a first phase, the worn engraving and the old layer are ground off from the cylindrical surface of the anilox sleeve, that is to say from the metal tube, and a coating, a carbidic tungsten carbide-cobalt-chromium layer (WC—Co—Cr) is subsequently applied. This carbidic layer is applied by a high-speed flame spraying (HVOF) process and subsequently functionalized by laser.