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Auto 3 fold mechanisms
Specification with fabric handle caps and stitching grade and quality
1) size 22 .5 X 8 /23.5 3 fold Auto Umbrella Cloth : Black Silver 210T GSM WP/WR
Frame : Ribs 22 .5 X 8 , 23.5 x 8 Plating Gilt (zinc) Rivit : S S , clipped frame Metal chrome Tips, Thickness of ribs part :0.43mm MS
Thickntess of long & short wire : 1.80 /1.75mm Tube : Chrome plating , Thickness: 0.40mm Plastic Runner, Spring Thickness: 2.2 X 18 coil, Hook : MS, Handle : ABS, Cap ABS
in the manufacture of umbrellas, core spun threads made from polyester and cotton/polyester are used almost exclusively. They are far superior to conven- tional threads made from cotton with regard to tensile strength, abrasion resistance, decay resistance and other important characteristics.
We use stitching density by 30 % (e. g. from 3 to 4 stit- ches/cm (0.4 inches)) increases the strength of the seam by 30 %. An increase in stitch density thus often enables the use of a finer thread.
In our production of umbrellas, a very high stitch density of 7 stitches/cm will have to be observed because the roof of the umbrella must be able to withstand high tension.