safety shoes are the general name of safety shoes and protective shoes, which are generally used in different workplaces to protect feet and legs from foreseeable injury. Safety protective shoes are high-tech and high value-added footwear products. The production process of safety protective shoes has high requirements for raw materials, accessories, chemicals, mechanical equipment, etc. at present, many domestic shoe-making enterprises with a certain scale and grade have turned their attention to safety protective shoes, which used to be a market area occupied by developed countries. Xiaobian has collected some international standards about safety shoes, which 1 believe interested friends will like< 1. The European standard en344:1997 "special safety, protection and work shoes" is formulated by CEN / TC61 "protective equipment for feet and legs", and its secretariat is BS1
the standard specifies the type design, whole shoe, upper, lining, tongue, insole, insole and other structure and performance indexes of safety protective shoes. The test method of each item specified in the standard is similar to other similar standards, and its principle is generally applicable to most safety protective shoes. The main indexes are as follows:
a. the impact resistance of Baotou is tested with a steel impact hammer of specified weight, and the clearance height under Baotou should be less than the specified value when it is impacted, Moreover, there should be no penetrating crack in the direction of test axis. 1t is worth noting that the weight, specification, impact height and structure of testing machine of impact hammer are different in different countries’ standards, which should be distinguished in actual test
B. a pressure plate is installed on the puncture resistance testing machine, and a test nail is installed on the pressure plate. The test nail is a head with the tip cut off, and the hardness of the nail head should be greater than 60HRC. The sole sample is placed on the chassis of the testing machine in such a position that the test nail can be punctured through the outer sole, and the test nail is punctured at a speed of 10 mm / min ± The speed of 3mm / min pierced the sole until it penetrated, and the maximum force required was recorded. Four points on each sole were selected for the test (at least one of them is at the heel), and the distance between each point is not less than 30mm, and the distance from the insole edge is more than 10mm. There is an anti slide bottom, which should be punctured between the blocks. Two of the four points should be tested within the distance of 10-15mm from the edge line of the planting bottom ridge. 1f the humidity will affect the results, the sole should be soaked in 20 ℃ water before the test ± Deionized water at 2 ℃ 16 ± 1h.< The electrical properties of br/>
C. conductive shoes and antistatic shoes are adjusted in dry and wet atmospheres. The clean steel balls are filled into the shoes and placed on the metal probe device. The electrical resistance between the front two probes and the third probes is measured by the specified resistance tester. 1n general, the resistance of conductive shoes should not be greater than 100k ohm; The resistance of antistatic shoes should be between 100k ohm and 100m ohm
D. the thermal insulation performance of the finished shoes was taken as the sample, the thermocouple was installed in the center of the inner sole connection area, and the steel ball was filled into the shoes. Adjust the temperature of sand bath pot to 150 ℃ ± 5 ℃, put the shoe sample on it to make the sand contact the outer sole of the shoe, use the temperature testing device connected with thermocouple to measure the temperature of the inner sole and the corresponding time, and give the temperature increasing curve. Calculate the increased temperature after 30 minutes from the sample placed on the sand bath. Generally, the temperature increment of insole surface is required to be less than 22 ℃
e. the maximum compression load of the test instrument for energy absorption performance of heel part is 6000N, and the device for recording load / deformation characteristics is equipped. Place the heel sample on a steel plate, and place the test punch on the inner center of the heel part against the insole. The load was applied at the speed of 10 mm / min ± 3 mm / min. Draw the load / compression curve and calculate the absorbed energy E in joules
F. requirements for antiskid outsoles the standard specifies the antiskid coefficient of the sole, but specifies the design and specifications of the antiskid slider, such as the thickness of the sole, the height of the antiskid slider, and the distance from the edge of the sole