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Protection of toe shoes European standard EN 344:1997 "special safety, protection and working shoes", CEN/TC61&ldquo, foot and leg protection products ” Technical Committee, its secretariat is held by BSI. This standard specifies the structure and performance indexes of safety protection shoes such as the design of the shoes, the whole shoe, the side, the shoe, the shoe tongue, the inner sole and the outsole. The standard test methods and principles are generally applicable to most safety shoes.
1. Impact resistance of Baotou
The impact test is carried out with a steel impact hammer with a specified weight. The height of the gap in Baotou under the impact of Baotou should be less than the specified value, and there should not be any penetrating cracks in the direction of the test axis in Baotou. It is worth noting that the weight, specifications, impact height and the structure of the test machine are different in the national standards, and the actual test should be distinguished.
2. Resistance to piercing performance
The test machine is equipped with a pressure plate, and the test board is equipped with a test nail. The test pin is a cutting head, and the hardness of the nail head should be greater than 60HRC. The shoe sole specimen is placed on the chassis of the test machine. The position can make the test nail pierce through the outer bottom. The test nail is 10mm/min ± the speed of 3 mm/min pierces the sole until the maximum force is recorded until the penetration is penetrated. 4 points on each sole are selected for testing (at least 1 points in the heel). The distance between the points is not less than 30mm, and the distance from the bottom edge is greater than 10 mm. The bottom of the anti slide block should be punctured between blocks. The 2 points in the 4 points should be tested at a distance of 10-15 mm from the edge line of the planting floor. If humidity can affect the result, the shoe sole should be immersed in 20 degree &plusmn and 2 degree deionized water 16&plusmn, 1H before testing.
3. Electrical properties of conductive shoes and antistatic shoes
After adjusting the shoes in a dry and wet atmosphere, a clean steel ball is filled into a human shoe and placed on a metal probe device. The resistance of the first two probes and third probes is measured by a specified resistance test instrument. Under normal circumstances, conductive shoes require resistance should not be greater than l00K ohms; antistatic shoes require resistance between 100K ohms and 100M ohms.
4. Heat insulation performance
Take the shoe as the sample, install the thermocouple in the center of the bottom connecting area and fill the ball with the steel ball. Adjust the temperature of the sand bath to 150 degrees C 5 C, put the shoes on it, make the sand contact the outer bottom of the shoe, and use the temperature test device connected with the thermocouple to determine the temperature and the corresponding time of the inner bottom, and give the curve of the temperature increase. The temperature increased from the sample placed to the sand bath after 30min is calculated. The general insulation shoes require that the temperature increment of the inner surface is less than 22 degrees C.
5. Protect the energy absorption performance of toe shoe heel parts.
The maximum compression load 6000N of the test instrument is equipped with a recording load / deformation characteristic device. Put the heel shoe on a steel plate and place the test punch in the center of the heel part by the insole. Load the load at the speed of 10mm/min 3 mm/min. The load / compression curve is drawn, and the absorbed energy E is calculated, expressed in Joule.
6. Requirements for antiskid outsole
The standard stipulates the antiskid coefficient of the shoe sole, but it stipulates the design and specifications of the anti slider, such as the thickness of the sole, the height of the slider and the distance from the edge of the sole.