How to identify the quality of safety shoes?

At first glance: cowhide (a kind of genuine leather, which is the customary name for people to distinguish synthetic leather in leather products industry) has obvious irregular patterns and natural gas holes on its surface, which is cold-resistant, folding-resistant, breathable and sweat-wicking; Membrane transfer leather is called natural synthetic leather, which is made by sticking an artificial surface layer on the loose fiber layer under natural leather. Its grain pattern is similar to that of natural leather, but it has no pores, hard feel and good waterproof performance. The second touch: feel full and elastic, touch the skin without cold feeling by hand, and the skin with hard cold feeling is mostly transferred skin. 3. Observing from the cross section: there is no obvious film layer on the cross section of dermis, and fluff will be found when scraping the matrix by hand, which is the most obvious performance of fibrous matrix (dermal matrix); The transfer film leather is ground on the loose fiber layer or fiber under the natural leather, bonded with adhesive under high pressure, and then attached to the artificial surface layer, and the surface layer is scraped with a knife edge to peel off some small pieces of the surface layer. 2. Production technology of safety shoes: Domestic production technology of safety shoes is divided into molding, injection molding, gluing and sewing. Injection-molded safety shoes are light in weight and have high viscosity between soles and uppers. The outsole is usually made of polyurethane, which is wear-resistant and waterproof. Rubber overshoes are a traditional craft with a long history of production. Generally, the sole is made of rubber and sticks to the upper. Tire sole shoes, the molding process is relatively cheap, belonging to low-grade products, which will not be introduced here. 3. Technology and equipment for producing safety shoes: This paper mainly introduces the production equipment for injection safety shoes. At present, it is recognized that the most advanced production equipment for safety shoes in the world are DESMA continuous injection shoe machine in Germany and famous continuous injection shoe machine in Italy, and their processes are all controlled by computers. Among them, the combination of DESMA and Bayer Science and Technology Materials Company's ultra-low density foaming technology makes the technical gold content of DESMA equipment reach a new height that similar equipment in the world can't reach, and its cushioning performance, energy absorption performance, seismic performance and adhesion fastness are always at the forefront of technology. However, due to the high price of such products, a few enterprises are taking the lead in using high-quality products brought by China's scientific and technological equipment. Domestic disc injection shoe machine is widely used by most safety shoe manufacturers because of its low price, convenient maintenance and fast output speed. The quality of products is generally in the hands of operating technicians, and its production cost is much lower than that of imported equipment. 4. Shoes for safety shoes: steel head protection shoes need steel heads, puncture-proof shoes need steel bottom plates, and anti-static shoes need antistatic agents and anti-static wires. It is necessary to observe and test the protection performance to know whether it meets the product grade certified by the supplier.