Abstract: A method for manufacturing a resin product with a mold having at least two molds opposed to each other. Each of the molds 5 has a cavity surface defining a space therebetween. The method includes the steps of performing an ionic nitriding treatment to at least a part of at least one cavity surface to form fine projections and recesses therein. A nitride layer is provided on the one cavity surface. The method further includes filling the space with a plastic resin material, solidifying the resin material, and removing the solidified resin material from the mold.

Abstract: A resin product has a body made of a resin. The body has an outer surface including an ornamental surface and an unornamental surface, a first area defined on the outer surface, and a chemical plating layer and an electroplating layer respectively formed on the first area. A process for producing the resin product comprises the step of making a first boundary along a contour of the first area located on the ornamental surface, and the step of making a second boundary along a contour of the first area located on the unornamental surface. The step of making the second boundary includes forming a resist layer on the unornamental surface. The resist layer has a resistivity to a chemical plating solution for making the chemical plating layer.

Abstract: A sealing apparatus, which provides a seal between a metal surface and a member sliding along the metal surface is made of rubber material which contains a rubber polymer having alkyl lateral chains. At least a part of alkyl group hydrogen of rubber polymer in cortex is substituted from fluorine by plasma treatment. The plasma treatment reduces the noise which is normally present in device as of this type.

Abstract: A method for treating the surface of a polyolefin resin molded article is disclosed, comprising applying a running aqueous ozone solution in the form of a stream (or a waterfall) or spray onto the surface of a polyolefin resin molded article to oxidize the surface of the molded article for modifying the surface. Surface modification can be carried out on the same line in a series of processing, and extremely satisfactory results can be obtained by a short-time treatment with reduced energy. A coating layer formed on the modified surface exhibits high adhesion.

Abstract: Contoured step sections and contoured grooves along the step sections are formed on a grille body. The grille body is subjected to chemical plating. Since the grooves have narrow bottoms, the bottoms remain unplated, so that a chemical plating layer is formed on the entire surface of the grille body except for the bottoms. The grille body having the chemical plating layer formed thereon is then subjected to an electroplating step having a plurality of steps. An undercoat plating layer is formed on the chemical plating layer formed on the portions where decorative plating is to be applied. The chemical plating layer formed on the portions where no decorative plating is to be applied is dissolved with a predetermined solution. Subsequently, a general electroplating layer is formed on the undercoat plating layer. Thus, the chemical plating layer and the electroplating layers are formed only on the to-be-plated portions.

Abstract: A resin molded article comprising a main body of molded material, an intermediate coating layer comprising scaly pieces of matter and a resin constituent composed of one, or a plurality of layers, and a finish coating layer formed on the outermost surface of the intermediate coating layer. The resin molded article of the present invention provides improved resistance to chipping.

Abstract: A method for modifying the surface of a polyolefin resin molded article is disclosed, comprising contacting a polyolefin resin molded article with an ozone aqueous solution to oxidize the surface of said molded article. The surface of a polyolefin resin molded article can be modified easily and uniformly whatever shape the molded article may have. Previous cleaning of the molded article with an organic solvent is unnecessary. A coating layer can be formed on the thus modified surface with high adhesion.

Abstract: Method and apparatus for improving the surface quality of a resin molding by treating it with a plasma gas, measuring and integrating ion density and stopping the treatment when the integration reaches a predetermined value.

Abstract: Method and apparatus for improving the surface quality of a resin molding by treating it with a plasma gas, measuring and integrating ion density and stopping the treatment when the integration reaches a predetermined value.

Abstract: Disclosed is a corona discharge treating method and apparatus for a three-dimensional resin molding having corners, in which a corona discharge electrode at least having a curved surface discharge portion is relatively moved along the shape of the surface of the molding with corona discharge generated in the vicinity of the molding.

Abstract: The present invention relates to a plasma processing apparatus comprising a housing chamber which accommodates substances to be painted made of synthetic resin, a rotating support base which is provided in the housing chamber and rotates the substance to be painted, a plurality of hangers which are placed on the rotating support base and supports the substance to be painted, at least one plasma injection tube which is provided in the housing chamber and giving plasma processing to the surface of substance by injecting plasma gas thereto, and a variable speed drive means which rotates the rotating support base at the speed in accordance with a size and a number of substances to be painted.

Abstract: Herein disclosed is a plasma treating apparatus for treating articles such as bumpers of synthetic resins with a plasma gas to activate the surfaces of said articles before the same are painted. The plasma treating apparatus comprises: a body defining a chamber for accommodating said articles; a plasma injection pipe disposed in said accommodating chamber for injecting the plasma gas onto the surfaces of said articles; a pair of rotatable supporting members juxtaposed in said accommodating chamber to each other and made rotatable on an axis; and a plurality of supporting beds supported between said rotatable supporting members for supporting said articles.