CS251167B1 - Method of producing a tensioning tape for television screens - Google Patents

Abstract

Cold-worked strip with a total deformation of 50 to 80%, 0.4 to 1.0 mm thick and a surface roughness Rz of up to 4 µm is galvanically galvanized with a layer of 4 to 6 µm, after which the galvanized strip is longitudinally divided into strips with a final width of 10 to 25 mm.

Description

BACKGROUND OF THE INVENTION The present invention relates to a method for manufacturing a tension tape for television screens, which serves as an anti-flood frame.

At present, the tensioning tapes of television screens, in particular for color television, are made of a steel strip of a width corresponding to the final width of the antiimposition frame. The productivity of this tape is low, the manufacturing is laborious and when the surface of the tapes is applied by applying a protective layer, the consumption of the applied coating agent is disproportionately high and makes production less profitable. In order to increase productivity, the narrow tension strips are provided with a protective layer in several streams, which, however, makes it difficult to control the process, the use of a multi-stream device being associated with high purchase costs; the uniqueness of the equipment does not allow its use when changing the product range, and in the case of partial use of the equipment, ie when not using all the currents, the balance of use of the equipment is not satisfactory.

These disadvantages are overcome by the method of manufacturing a stretch tape for television screens by rolling and galvanizing a surface according to the invention. SUMMARY OF THE INVENTION The cold strip reinforced with a total deformation of 50 to 80% with a thickness of 0.4 to 1.0 mm and a surface roughness R of up to 4 .mu.m is galvanized with a layer of 4 to 6 .mu.m, whereupon the galvanized strip is longitudinal divides into strips of a final width of 10 to 25 mm.

An advantage of the inventive tension belt manufacturing method is that labor productivity has been greatly improved, while providing good corrosion resistance both on the base surfaces of the tension belt and at the cutting edges. The consumption of material applied to the surface of the tensioning tape as well as the consumption of electrical energy have been reduced. The tensioning tapes exhibit good mechanical properties and good corrosion resistance while improving geometric parameters.

According to an exemplary embodiment, a semi-finished product was made of 0.08% carbon, 0.4% manganese, 0.1% silicon, 0.035% sulfur

251,167 and 0.030% of phosphorus which was hot rolled and then cold rolled from 3.0 mm thick to 0.74 mm thick and 196.0 mm wide. Roughness R _of the belt was 3.6 microns, the strength of 630 MPa. The strip was galvanized on both sides with a zinc layer of 4.9 [mu] m and then divided lengthwise to a width of 19.0 mm. The produced tensioning tapes showed very good corrosion resistance even in the seaside environment, while maintaining a quality surface, without the need for special heat treatment of the tapes. There was no corrosion attack on exposed cutting edges.

SUBJECT MATTER

Claims (1)

SUBJECT MATTER Method for producing a stretch tape for television screens by rolling and galvanizing a surface, characterized in that the cold strip strengthened with a total deformation of 50 to 80%, with a thickness of 0.4 to 1.0 mm and a surface roughness of up to 4 µm, is galvanized. In this case, the galvanized strip is divided longitudinally into strips of a final width of 10 to 25 mm. Printed by Moravian printing works, center. 11 1Q0, Class of People's Militia 3, Olomouc Price: 2,40 Kčs