Method for plasma treatment of resin material

A method for irradiating resinous work pieces with plasma within a vacuum reaction chamber, the method comprising the steps of:

• positioning said resinous work pieces on support surfaces within the reaction chamber;
• introducing the plasma into a plurality of pipes individually spaced along an inner continuous side wall of said reaction chamber, said side wall also having a plurality of spaced exhaust ports, each of said plurality of pipes being individually paired in diametrically opposed relation with a respective one of said plurality of exhaust ports enabling plasma to flow through said reaction chamber;
• injecting plasma through nozzle openings spaced along said plurality of pipes, said nozzle openings being circumferentially spaced at staggered positions of up to 30.degree. on either side of a reference plane defined by an axis running through the center of each of said paired plurality of pipes and exhaust ports;
• and
• operating each pair of said paired plurality of pipes and exhaust ports intermittently and at different timing from said remaining pairs of said paired plurality of pipes and exhaust ports, thereby uniformly distributing plasma on said resinous work pieces positioned within said reaction chamber.