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In the process of metallurgical operations, in order to prevent the splashing metal droplets from causing damage to the staff, work clothes with protective effects are often worn, and the fabrics used to make work clothes must achieve protective effects, not only depends on the thermal conductivity of the fabric, but also with the The melt resistance of the fabric is related to its flame retardant properties.

 

 (1) Physical and chemical performance indicators. It is mainly assessed from six aspects: safety performance, basic performance, dimensional change performance, mechanical performance, comfort performance, and color fastness. In terms of safety performance, it includes formaldehyde content, PH value, decomposable carcinogenic aromatic amine dyes, and is an important indicator for the life, health and safety of users of metal fabrics involving anti-melting and splashing. The basic performance includes the mass deviation rate per unit area. This indicator is generally used as an important basis for downstream customers to purchase. The value will affect the reprocessing of downstream products, and the specific value of downstream customers will have different requirements according to different product forms. Aspects of dimensional change include water wash dimensional change rate. As a reusable work clothes, the dimensional change rate of washing is a necessary condition to ensure the normal use of the user. Mechanical properties include breaking strength and tearing strength. Molten metal splash protective fabrics and clothing are subject to varying degrees of stretching force during the production process, and may be torn during the stretching process. In terms of comfort performance, it includes pilling and moisture permeability. The working environment of the metallurgical industry has high temperature and high labor intensity. The moisture permeability and pilling of clothing fabrics directly affect the user's comfort and work mood. In terms of color fastness, it includes color fastness to perspiration, color fastness to rubbing, color fastness to soaping and color fastness to light. In the high-temperature working environment of the metallurgical industry, users sweat frequently. At the same time, the clothing will be affected by friction, light, and washing during normal use, which will affect its appearance. It is necessary to evaluate the resistance to sweat, friction, soap and light color. Fastness.

(2) Flame retardant protection performance index. Including thermal stability, flame retardancy. In the production process of the metallurgical industry, there are dangers such as blast furnace gas combustion and explosion, coal powder explosion, etc. In order to avoid harm to workers, clothing with flame retardant and thermal protection functions should be worn.

(3) Thermal protection performance index. Including convection heat conduction, radiant heat conduction, impact resistance to molten aluminum, impact resistance to molten iron, and contact heat conduction. The main sources of danger in the process of metallurgical production include high temperature radiation, metal solution and slag splashing and explosion, etc. Among them, the incidence of scalding and high temperature radiation in production is relatively high. Therefore, convective heat conduction, radiation heat conduction, impact resistance to molten aluminum, impact resistance to molten iron, and contact heat conduction should be assessed.

(4) Appearance quality index. According to the requirements of the next process, the appearance quality of the anti-molten metal splash fabric is mainly assessed in six aspects: color difference, weft skew, bow skew, width deviation, scattered defects and local defect scores.