Abstract:
Apparatus for modifying the surface region of a polymer article includes an applicator unit (20) defining a gap (26) extending therethrough. In use, the applicator unit is received within a treatment tank (180) filled with fluid, such as water, and immersed in the fluid and a polymer article is moved through the gap. A solvent is introduced into the gap through a channel (34) and subsequently substantially removed by a primary vacuum module (68). Wash water is then applied to the polymer article by a wash module (94) and the wash water is then removed by a secondary vacuum module (68) and/or a wiper (46) which contacts the surface of the polymer article. The solvent may modify the surface region of the article by dissolving surface imperfections or it may include a dissolved modifier ingredient which is then incorporated into the surface of the article.
Abstract:
Apparatus for detecting the presence of a modifier ingredient, such as an UV stabiliser, in a substrate surface, for instance of PVC, includes a UV generator (12) which produces UV radiation which is directed to a desired area (22) of the substrate surface (16). An image of the desired area of the surface is formed by a lens (23) at an image plane on a detector (26) which is arranged to detect the fluorescent radiation produced by the substrate surface. The detector (26) generates a signal in response to the fluorescent radiation incident thereon which is representative of the degree to which the substrate surface has been modified.
Abstract:
Apparatus for modifying the surface region of a polymer article includes an applicator unit (20) defining a gap (26) extending therethrough. In use, the applicator unit is received within a treatment tank (180) filled with fluid, such as water, and immersed in the fluid and a polymer article is moved through the gap. A solvent is introduced into the gap through a channel (34) and subsequently substantially removed by a primary vacuum module (68). Wash water is then applied to the polymer article by a wash module (94) and the wash water is then removed by a secondary vacuum module (68) and/or a wiper (46) which contacts the surface of the polymer article. The solvent may modify the surface region of the article by dissolving surface imperfections or it may include a dissolved modifier ingredient which is then incorporated into the surface of the article.