Abstract: A printing form for rotary screen printing is provided and includes a thin-walled hollow cylinder made from fiber-reinforced plastics material, the cylinder wall of which is provided with continuous printing openings which define an image which is to be printed. The cylinder includes at least one layer having fibers with at least one oriented direction of the fibers. Multi-layer laminates made from carbon/epoxy having at least one layer with an oriented direction of the fibers which is parallel to the longitudinal axis of printing form are preferred.

Abstract: A thin-walled hollow cylinder is made from fiber-reinforced plastics material, the cylinder wall of which is composed of at least one layer having fibers with at least one oriented direction of the fibers, and the total wall thickness dtot lying in the range from 10 to 1000 &mgr;m, and the ratio dtot/D being≦0.0025. The oriented direction(s) of the fibers are selected depending on the intended final application. Examples include, inter alia, multi-layer laminates made from carbon/epoxy, used for the production of a cylinder of this nature, having at least one layer with an oriented direction of the fibers which is parallel or perpendicular to the longitudinal axis of the cylinder.

Abstract: A printing form for rotary screen printing is provided and includes a thin-walled hollow cylinder made from fiber-reinforced plastics material, the cylinder wall of which is provided with continuous printing openings which define an image which is to be printed. The cylinder includes at least one layer having fibers with at least one oriented direction of the fibers. Multi-layer laminates made from carbon/epoxy having at least one layer with an oriented direction of the fibers which is parallel to the longitudinal axis of printing form are preferred.

Abstract: A porous product, typically a foam sheet, can be produced by peeling of a foam supply. By peeling the foam supply along its z axis, a product is produced having pores with a uniform pore aspect ratio in the longitudinal direction. Such a porous product, when containing an active filler, can be used as a battery electrode. The electrode can have enhanced electrical and mechanical properties.

Abstract: A thin-walled hollow cylinder is made from fiber-reinforced plastics material, the cylinder wall of which is composed of at least one layer having fibers with at least one oriented direction of the fibers, and the total wall thickness dtot lying in the range from 10 to 1000 &mgr;m, and the ratio dtot/D being ≦0.0025. The oriented direction(s) of the fibers are selected depending on the intended final application. Examples include, inter alia, multi-layer laminates made from carbon/epoxy, used for the production of a cylinder of this nature, having at least one layer with an oriented direction of the fibers which is parallel or perpendicular to the longitudinal axis of the cylinder.

Abstract: A description is given of a screen product which in particular is suitable for use in flat screen or rotary screen printing. This screen product comprises an electroformed, essentially nickel-containing metal body which determines two essentially parallel faces, and which is provided with a large number of openings, each opening extending from one of the two faces to the other, and each opening having a side wall in common with the metal. In order to prevent light scattering by the screen product, at least a part of at least one of the two faces of the screen product or the side walls of the openings is made radiation-absorbing. A method for increasing the radiation-absorbing capacity of a screen product is also described.

Abstract: A screen material is described which is formed by cladding, using electroplating, a structure composed of strands or fibers. The structure may incorporate a knit, woven or nonwoven material or, alternatively, of strands or fibres welded together, wound strands or fibers. The structure may be subjected to a calendering operation. The screen material, after having been provided, if required, with an electrically conductive cladding, is provided with a metal layer in an electroplating operation under conditions in which an overgrowth ratio R greater than 1 is achieved. The invention also describes a method for manufacturing such a screen material which preferably involves making use of an electroplating bath for depositing a metal cladding on a starting material in which a chemical compound is present which increases the overgrowth ratio R. The method can be implemented using a variety of conditions which can lead to an overgrowth ratio R of a desired value.

Abstract: Squeegee assembly in particular intended for coating substantially cylindrical objects with a liquid or pasty material, at least comprising an annular squeegee with an outer mounting edge and an inner levelling edge, the latter comprising a ring member and/or ridges substantially extending in the intended direction of movement of the squeegee, the ridges defining grooves, which grooves are designed to form channels with the surface of the object to be coated.

Abstract: Squeegee assembly in particular intended for coating substantially cylindrical objects with a liquid or pasty material, at least comprising an annular squeegee with an outer mounting edge and an inner levelling edge, the latter comprising a ring member and/or ridges substantially extending in the intended direction of movement of the squeegee, the ridges defining grooves, which grooves are designed to form channels with the surface of the object to be coated.

Abstract: A method for the production of metal foam with high specific surface area is disclosed. A foam material which may be either conductive or nonconductive is provided. If the material is nonconductive, an electrically conductive covering layer is formed. The electrically conductive foam material is then electrolytically coated with nickel from a nickel plating bath. The bath includes at least one unsaturated organic second class brightener in an amount effective to promote preferential growth of nickel onto the foam material such that the value of the growth ratio R, defined by the total of the growth of metal onto the foam material in the direction of the preferential growth divided by the total of the growth of metal in a direction perpendicular to the direction of the preferential growth, is greater than one. The nickel plating may be carried out using pulse current. The bath liquid may be flowed through the openings of the foam substrate in one or more directions during the deposition.

Abstract: Squeegee assembly, in particular intended for coating an substantially cylindrical object, such as metal, seamless screen printing cylinders, with a liquid or pasty material, at least comprising two substantially annular squeegees arranged at a distance from each other, between which squeegees material metering means open out for metering a material to be applied to the object to be coated; which squeegees can form part of a wall which is resilient, at least in places, of an annular squeegee pressure chamber, which is provided with pressure fluid supply means, while an annular material-supply chamber may be present in the squeegee pressure chamber which is provided with openings which open out between the squeegees, and also comprises a material supply which can be connected to a material source.

Abstract: A method for the production of a metal foam is described.To this end a suitable foam material (1)is provided, if necessary, with an electrically conducting covering layer (1') and then thickened by plating with metal in an electrolytic bath.According to the invention the electrolytic bath used contains a brightener; in particular a chemical compound having the properties of a second class brightener.Metal foam obtained by means of the method is also described.

Abstract: A device for fixing end rings in the ends of a rotary screen printing stencil wherein a layer of adhesive, which has been applied between the end rings and the ends of said stencil, is hardened by using infra-red radiation producing means such as infra-red radiators. Such radiators each have a reflector which is insulated at their back-sides. During the treatment with infra-red radiation, the assembly of end rings and printing stencil may be rotated around the longitudinal axis of the stencil.

Abstract: A metal suspension half-cell for an accumulator is described, in which the metal suspension, consisting of metal particles and an electrolyte, has been stabilised by adding additive particles which comprise a ceramic material which promotes chain formation in the suspension. As a result of the said chain-forming ceramic material, the metal suspension can be operated essentially stationary within the half-cell. Diverse special geometries of the half-cell are illustrated. As a result of the composition of the suspension and the cell design, an increased cyclability of the cell is obtained. A method for operating a metal suspension half-cell according to the invention during charging/discharging thereof and a metal suspension accumulator which comprises a half-cell according to the invention are also described.

Abstract: The invention relates to a process for the production of a metal screen by irradiating a metal basic layer with high-energy, focused radiation, wherein at least one metal basic layer (3) to be perforated to form a screen is supported in intimate contact on both opposite surfaces during the irradiation by a supporting element (1,5) adapted to the shape of the metal basic layer (3), using a release layer (2,4) between a supporting element (1,5) and the opposite surface of the metal layer (3), and after perforation the two supporting elements (1,5) and the release layers (2,4) are removed. According to the present process it is also possible to produce several screens at the same time by using a stack of metal basic layers (3,3',3"), between which release layers (2',2") are present. The metal basic layer (3,3',3") is a copper or nickel-containing compound, preferably copper.

Abstract: Described is a method for forming a sieve material in which a sieve skeleton is thickened in an electrolysis bath with metal; in the bath as used at least one chemical compound is present having properties of both a first and second class brightener in such concentration and added with such a rate in view of the Ah (ampere hour) load that the internal stress in the finished sieve material is reduced in comparison to a sieve material produced in a bath comprising a conventional compound under conventional conditions. The invention also relates to a sieve material formed with the method described.

Abstract: Described is an electrode material for use in a storage battery half-cell of the type in which a suspension of particles of active material circulates. Upon charging such a half cell the electrode material according to the invention prevents the formation of a strongly adhering precipitate of active material, such as zinc, on the electrode material. The electrode material comprises for that purpose, at least at its surface, an electrically conducting ceramic material. The invention also concerns a storage battery half-cell comprising such electrode material and a storage battery comprising one or more storage cells each comprising two of such half cells.

Abstract: Described is a method for manufacturing light weight roller in which a thin metal roller casing, such as a thin electroformed sleeve, is centered by journals after which inside the roller casing a low density filling is applied. The low density filling may be a set plastic foam or gas under pressure. In a further embodiment a metal inner roller casing is present which is concentric with an outer roller casing. The space inside the inner casing and the space between the inner casing and the outer casing may be filled with a low density material. Also is described a roller thus obtained having a roller casing of electroformed nickel of a thickness between 100 and 500 .mu.m.

Abstract: The invention relates to a method of forming of a patterned photopolymer coating on a printing roller in which a photopolymer coating, present on said roller, and covered by a light-sensitive intermediate layer is exposed in a first stage to form an image of opaque and translucent parts in said intermediate layer.Subsequently the photopolymer layer is exposed via the image formed in the intermediate layer, after which the photopolymer layer is developed.Between abovementioned exposures, in case of a relatively thick, flexible, photopolymer, a period is waited to ensure that depressed parts of the photopolymer layer have returned to their original state.The invention also relates to a printing roller thus obtained.

Abstract: Process for the production--using plasma spraying--of a coated product in which the coating consists of a ceramic fluorocarbon polymer-comprising coating, while between the surface of the product and the ceramic fluorocarbon polymer-comprising coating an adhesion layer completely of metal is applied. The adhesion layer consists in particular of at least two metals reacting exothermally with each other under plasma spraying conditions. In particular, the product to be coated is a thin-welled nickel, seamless cylinder with a wall thickness of 50-220 .mu.m. The invention also relates to an ink transfer roller in which a thin-walled seamless cylinder obtained by the process according to the invention is used.