European Standard EN 344:1997 "Special Safety Shoes, Protective Footwear and Work Shoes", which is developed by CEN/TC61 Technical Committee for "Protection of Foot and Legs" and its secretariat is operated by BSI. This standard specifies the structural design and performance indicators of safety shoes, such as shoes, uppers, shoes, tongues, insole and outsole. The test methods of each item specified in the standard are similar to other similar standards, and the method principle is also generally applicable to most safety shoes. The main indicators are:
1 Baotou impact resistance
The impact test shall be carried out with a steel impact hammer of a specified weight. The height of the gap under the toe cap shall be less than the specified value when the toe cap is subjected to impact, and the piercing shall not show any penetrating cracks in the direction of the test axis. It is worth noting that the national standards have different regulations on the weight, specifications, impact height and construction of the test machine. The actual test should be distinguished.
2 anti-piercing performance
The test machine is equipped with a pressure plate on which the test nail is mounted. The test nail is a tip with a pointed tip, and the hardness of the nail head should be greater than 60HRC. The sole sample was placed on the chassis of the testing machine in such a position that the test nail was pierced through the outsole, and the test nail pierced the sole at a rate of /min ± /min until the penetration was completed, and the maximum force required was recorded. Four points are selected on each sole for testing (at least one of which is at the heel), and the points are not less than each other and the distance from the inner bottom edge is greater. The bottom of the anti-slip block should be pierced between the blocks. Two of the four points should be tested within a distance of 10 from the edge line of the bottom of the plant. If humidity affects the results, the sole should be immersed in ±1 deionized water for 16 ± 1 h before testing.
3 Electrical properties of conductive shoes and anti-static shoes
After the shoe sample is adjusted in a dry and wet atmosphere, the clean steel ball is filled into the human shoe and placed on the metal probe device, and the first two probes and the third probe are measured using a prescribed resistance tester. Resistance between. Under normal circumstances, conductive shoes require resistance should not be greater than l00K ohms; anti-static shoes require resistance should be between 100K ohms to ohms.
4 thermal insulation performance
Taking the shoe as a sample, the thermocouple is placed at the center of the insole connection area, and the steel ball is filled in the shoe. Adjust the temperature of the sand bath to the shoe, place the shoe on it, make the sand contact the outsole of the shoe, and use the temperature test device connected to the thermocouple to measure the temperature of the insole and the corresponding time to give the temperature. Increase the curve. The temperature increased from 30 minutes after the sample was placed on the sand bath was calculated. Generally, heat-insulating shoes require that the temperature increase of the inner bottom surface is less than.
5 energy absorption properties of the heel part
The test instrument has a maximum compression load of 6000 N and is equipped with a device for recording load/deformation characteristics. The shoe with the heel is placed on a steel plate, and the test punch is placed on the inner side of the heel portion against the insole. The load was applied at a rate of /min ± min. The load/compression curve is plotted and the absorbed energy E is calculated, expressed in joules.
6 Requirements for non-slip outsole
This standard stipulates the anti-skid coefficient of the sole, but specifies the design and specifications of the anti-skid block, such as the thickness of the sole, the height of the non-slip block, and the distance from the edge of the sole.
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