Method for modifying the surface of polymeric substrate materials by means of electron bombardment in a low pressure gas discharge
AssigneeForchungsinstitut fur Textiltechnologie
InventorsHans-Gert Kreiselmeier, Manfred Rost, Jochen Klemm
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Abstract
A method of modifying the surface of polymeric substrate materials, such as textile fabric including woven polymeric textile or textile fibers, by means of electron bombardment in a low pressure gas discharge medium to produce chemical and/or physical changes in the thus treated surface thereby improving the technological properties of the polymeric material, e.g., improved anti-static properties, dye absorption, dirt resistance, releasing of dirt absorbed and hydrophilation, among others.
Claims27
In a method for modifying the surface of a polymeric substrate material by means of electron bombardment in a low pressure gas discharge medium including a pair of stationary, spaced apart flat electrodes, the improvement which comprises guiding said substrate material past said electrodes and between and in parallel with said electrodes, negatively biasing said area electrodes against said medium, shielding the sides facing away from said substrate material with a grounded similarly parallel metal sheet, covering said electrodes on the sides facing said substrate material with a conductive material chosen for effecting the desired intensity of the current density, a dark space being formed in front of said area electrodes, said substrate material being situated at a distance from said flat electrodes greater than said dark space disposed in front of said area electrodes.
In a method of modifying the surface of a polymeric substrate material by means of electron bombardment in a low pressure gas discharge medium including a pair of flat, rectilinear, spaced apart electrodes immovably mounted within a vacuum chamber, the improvement comprising:
- a. negatively biasing the area electrodes against the gas discharge medium;
- b. shielding both said electrodes on the sides facing away from the substrate material with a grounded metal sheet extending parallel to the path of the substrate material;
- c. covering both said electrodes on the sides facing said substrate material with a material chosen to effect the desired amount of Gamma secondary electrons and thus in combination with the gas discharge medium the desired intensity of the current density;
- and
- d. guiding the substrate material in a path spaced from and parallel to said flat electrodes and between the same at a distance from the electrodes greater than the dark space formed in front of each of said area electrodes.
In a method of modifying the surface of a polymeric substrate material by means of electron bombardment in a low pressure gas discharge medium within a vacuum chamber and including a pair of stationary, spaced apart flat electrodes between which the material passes, said electrodes being shielded on the side facing away from the line of passage of the substrate material with a grounded metal sheet, said electrodes being covered on the sides facing the line of passage of the substrate material with a material chosen to produce in combination with the gas discharge medium a desired amount of Gamma secondary electrons and thus the desired intensity of current density, said area electrodes being negatively biased against said gas discharge medium, the improvement comprising the step of guiding the substrate material passed said electrodes and between and in parallel therewith at a distance from said electrodes greater than the dark space formed in front of said electrodes.
Dependencies are inferred from the claim text.