摘要:
Dampening-unit roller for a dampening unit of a printing machine includes a roller body having an outer cylindrical surface, and a coating on the outer cylindrical surface, the coating including or consisting of an oxide of zirconium and/or an oxide of yttrium.
摘要:
The hydrophilic properties of a printing-machine roller are adjusted with a coating applied on an outer surface of its cylindrical body. The coating contains at least 45% by weight of pure silicon, or it is formed exclusively of chemically pure silicon. The coating is between 0.2 and 2 mm thick and its surface roughness R.sub.z is no more than 5 .mu.m.
摘要:
A printing and/or varnishing machine having a plurality of sheet-guiding cylinders in which at least one of the cylinders has an outer detachable packing which has enhanced ink repellent characteristics and which significantly reduces wear. The packing has a layered structure which includes a flexible backing material 12, the underside of which is assigned to the base body of the sheet-guiding cylinder 3, a coating 13 of molybdenum or tungsten carbide/cobalt which is adhesively applied to the upper side of the backing material 12, and a sealing layer 14 of a material made from the group of polysiloxanes which is adhesively applied to the upper side of the coating 13. The side of the packings 5, 6 which faces the material to be printed has a surface profile consisting of cones 18 with rounded tips 16 for reduced sheet contact.
摘要:
A printing and/or varnishing machine having a plurality of sheet-guiding cylinders in which at least one of the cylinders has an outer detachable packing which has enhanced ink repellent characteristics and which significantly reduces wear. The packing has a layered structure which includes a flexible backing material 12, the underside of which is assigned to the base body of the sheet-guiding cylinder 3, a coating 13 of molybdenum or tungsten carbide/cobalt which is adhesively applied to the upper side of the backing material 12, and a sealing layer 14 of a material made from the group of polysiloxanes which is adhesively applied to the upper side of the coating 13. The side of the packings 5, 6 which faces the material to be printed has a surface profile consisting of cones 18 with rounded tips 16 for reduced sheet contact.
摘要:
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.
摘要:
There is provided a coating for a body of steel or a carbon fiber reinforced plastic material with an adhesion-promoting layer of thermoplastic that is deposited on the body, in the surface near material matrix of which solid particles are embedded in a form-fitting adhering manner such that a partial region of particles projects from the adhesion promoting layer. For producing such a coating, the adhesion-promoting layer is heated to a honey-like viscosity, and powder particles are injected by thermal spraying, into the surface near material matrix of the heated adhesion-promoting layer in a form-fitting adhering manner such that the tips of particles project. These tips connect to deposited powder particles which form the functional layer of oxide ceramic such as Al2O3, Cr2O3, TiO2, SiO2 or ZrO2 or mixtures therefrom and/or wear resistant hard metal such as WC/Co, Cr3C2/NiCr, NiCrBSi, WC/Ni, TiC/Ni, molybdenum, or chromium or mixtures or alloys thereof.
摘要翻译:提供了一种用于钢体或碳纤维增强塑料材料的涂层,其具有沉积在主体上的热塑性粘合促进层,其表面附近的固体颗粒嵌入在形式配合粘附 使得部分区域的颗粒从粘附促进层突出。 为了制造这样的涂层,将粘合促进层加热至蜂蜜状粘度,并通过热喷涂将粉末颗粒以加热粘合促进层的材料基体附近的形式配合粘合方式注入到表面附近 粒子的尖端项目。 这些尖端连接到沉积的粉末颗粒,其形成氧化物陶瓷的功能层,例如Al 2 O 3,Cr 2 O 3,TiO 2,SiO 2或ZrO 2或其混合物,和/或耐磨硬金属如WC / Co,Cr 3 C 2 / NiCr,NiCrBSi,WC / Ni,TiC / Ni,钼或铬或其混合物或合金。
摘要:
Corona roller comprising a cylindrical base body and a roller cover of dielectric material, and method for producing it. The roller cover includes a layer of thermoplastic material, e.g. polyamide, applied onto the outer surface of the base body. Solid (powder) particles having electrically insulating characteristics are imbedded in the material matrix of said layer in the vicinity of the surface thereof in a form-locking manner such that merely a partial region of said particles protrudes from said inner layer. A hard, wear- and corrosion-resistant surface is formed at the outer side of the layer of plastic material, said hard, wear- and corrosion-resistant surface likewise having electrically insulating characteristics. For producing the corona roller, the layer of thermoplastic material is heated to a viscosity similar to that of honey. Preferably, a layer of oxide ceramic then is applied by thermal spraying, wherein the first powder particles thereof are shot into the heated layer of plastic material and subsequent particles form an outer functional layer. Alternatively, insulating particles of solid material may be dispersed into the heated layer of plastic material and may be ground thereby forming the wear-resistant surface.
摘要:
A wear-resistant, ink-repellent coating, for printing-press components, and in particular, web-fed printing presses. In order to provide a seal for this low-wear coating which results in a permanent ink-repellent surface quality and which additionally has a high resistance to standard cleaning agents used in printing technology, the printing-press component which is to be protected is first provided with oxide ceramic or hard metal layer. This layer may be applied by thermal spraying. In addition, the component is treated with a polyorganosiloxane sealant, particularly polyhydridomethylsiloxane, including the necessary heat-curing at moderate temperatures of from 100° C. to 170° C. so as to prevent ink deposition. The sealing may also take place after the wear-resistant layer has undergone a grinding and polishing treatment.
摘要:
There is provided a coating for a body of steel or a carbon fiber reinforced plastic material, particularly a roller, with an adhesion-promoting layer of thermoplastic that is deposited on the body, in the surface near material matrix of which solid (powder) particles are embedded in a form-fitting adhering manner such that only a partial region of these particles projects from the adhesion promoting layer, as well as with a functional layer of oxide ceramic or wear-resistant hard metal overlaying the adhesion-promoting layer, in which the partial regions of the particles projecting from the adhesion-promoting layer are embedded. For producing such a coating, the adhesion-promoting layer preferably is heated to a honey-like viscosity, and powder particles are injected, for example by thermal spraying, into the surface near material matrix of the heated adhesion-promoting layer in a form-fitting adhering manner such that only the tips of these particles project. These tips connect to subsequently deposited powder particles which form the functional layer of oxide ceramic such as Al2O3, Cr2O3, TiO2, SiO2 or ZrO2 or mixtures therefrom and/or wear resistant hard metal such as WC/Co, Cr3C2/NiCr, NiCrBSi, WC/Ni, TiC/Ni, molybdenum, or chromium or mixtures or alloys thereof
摘要翻译:提供了一种用于钢体或碳纤维增强塑料材料,特别是辊的涂层,其具有沉积在主体上的热塑性粘合促进层,在固体(粉末)颗粒的材料基体附近的表面中 以形式配合粘合方式嵌入,使得这些颗粒的仅部分区域从粘附促进层突出,以及覆盖粘合促进层的氧化物陶瓷或耐磨硬金属的功能层,其中 从粘合促进层突出的颗粒的部分区域被嵌入。 为了制造这样的涂层,粘合促进层优选被加热至蜂蜜状粘度,并且将粉末颗粒例如通过热喷涂注入加热的粘附促进层的材料基体附近的表面, 配合粘合方式,使得只有这些颗粒的尖端投射。 这些尖端连接到随后沉积的粉末颗粒,其形成氧化物陶瓷的功能层,例如Al 2 O 3,Cr 2 O 3,TiO 2,SiO 2或ZrO 2或其混合物和/或耐磨硬金属如WC / Co,Cr 3 C 2 / NiCr,NiCrBSi,WC / Ni,TiC / Ni,钼或铬或其混合物或合金
摘要:
A printing machine roller, especially an ink roller, and preferably an ink distributor roller, with a coating of the entire outer cylindrical surface. The coating consists of a support matrix of a good heat-conducting and low-wear metal, e.g., nickel or aluminum-silicon alloy and graphite or plastic particles, e.g., of polyester, inlaid into the metal matrix. The coating is produced by thermal spraying, preferably plasma spraying or flame spraying. The residual porosity of the coating can be varied within wide limits based on process requirements. This residual porosity also permits the ink-friendliness to be varied within wide limits via sealing with an ink-friendly plastic. The roughness of such layers can be adjusted virtually as desired to the individual requirements of the offset process.