The traditional coatings are divided into several categories, the most high-grade fluorocarbon coating, almost 20 years of corrosion protection. It is generally distributed from steel mills in the form of reels. The color steel plate we often see refers to the finished plate, with a thickness of about 50~100mm. It consists of the middle filler and the two-sided color steel plate.
Among them, the thickness of the color plate has different thicknesses such as 0.4mm, 0.5mm, 0.6mm, etc., and the intermediate layer may be polyurethane, rock wool or foam plastic. Due to the special profiles, the construction of the building with color steel plates is very fast (such as Xiaotangshan Hospital in SARS), but the strength is low. The substrate of the color coated steel sheet is a cold rolled substrate, a hot-dip galvanized substrate, and an electrogalvanized substrate. The coating types can be divided into polyester, silicon modified polyester, polyvinylidene fluoride and plastisol. The surface state of the color coated steel sheet can be divided into a coated sheet, an embossed sheet, and a printed sheet.
1. Features of tape measure
Gift rulers are used for advertising and promotion. They are divided into Steel tape (steel tape) and leather tape (PVC plastic fiber tape). They are usually cute and compact. Tape measures are also called measuring tools. Eighty-five percent of the world's tape measures are exported from China.
2, the characteristics of the tape measure
(1) The tape measure is too deformed and will not fail
Why didn't it fail? The spring in the tape measure is very long, and its range from completely relaxed to fully tightened is very large. The entire stroke of the tape measure includes it, and there is a margin at both ends, so the tape measure will not fail.
(2) Pull one meter long and pull two meters long, there is no difference in tension
The spring of the tape measure is very thin, and the amount of deformation when it is tightened is also small, so the reaction force is very small, and the force change is not felt when the rule is pulled.
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Yucheng tengxu Measuring Tool Co., Ltd , https://www.hardwaretoolstape.com