1. Switch performance
With an umbrella in your hand, you must first open the umbrella flexibly. Once you open it to the top, it will not be obstructed and will not fall; the umbrella is light and easy to close. The closing ring of the umbrella bone on the umbrella handle (rod) should be free to retract and lock the umbrella bone head. The switch parts will not malfunction or fall off. When using an automatic umbrella, the buttons must not be activated by themselves. The self-opening speed should be fast but not violent, even and powerful. The pulling force should not be too heavy when closing.
2. Umbrella surface
The cloth umbrella should be a special umbrella cloth with a twill weave, which is flat and tight, does not leak under heavy rain, has no pollution, no holes, and no yarn skipping. The stitches are uniform and fine, the color is consistent, and the flower shape and stripe stitching are similar. The surface of the nylon cloth umbrella should be coated with a layer of rain-proof resin glue, so that it will not leak during heavy rain, and there must be no obvious weaving defects and slurry leakage, and there must be no star points to transmit light. When the umbrella surface is opened, the umbrella shape should be full and beautiful, and it should not be in the shape of a basin or a deep bowl.
3. Umbrella bone
Umbrella ribs should not rust easily, be flexible, and feel moderately soft and hard. They should be close to the umbrella shaft after being retracted, and the rivet joints should be flexible and moderately smooth, smooth and without thorns.
4. Other parts
The umbrella shaft should be round and bright, free of burrs, no shelling, desoldering, cracking and other abnormal shapes. The end face of the exposed top should be flat and not sharp, smooth and without holes. Umbrella handles should be beautiful in shape, firm, and comfortable. In addition, after opening the umbrella, there should be no loose or fluttering joints when shaking.
