Protective glasses basic knowledge and working principle

First of all, there is no protection glasses in the industrial injury:
Foreign body eye damage refers to dry grinding metal, cutting non-metallic live cast iron, using hand tools or portable electric tools or using pneumatic tools to flush and repair metal castings, cutting rivets or screws, cutting or scraping boilers, broken hand or concrete, etc. During operation, foreign particles such as sand and metal debris enter the eye or impact the face.
Non-ionizing radiation eye damage, including visible light, ultraviolet rays, and infrared rays, emits photon energy that is insufficient to generate ionization in the atoms of the absorbing molecule and is therefore referred to as non-ionizing radiation. In electrical welding, oxygen cutting, furnaces, glass processing, hot rolling, and casting in industrial production, heat sources can generate intense light, ultraviolet rays, and infrared rays.
Ionizing radiation eye damage, including alpha particles, beta particles, gamma rays, X-rays, thermal neutrons, slow neutrons, fast neutrons, protons and electrons.
Microwave and laser eye damage. Both of these waves also belong to non-ionizing radiation of electromagnetic waves. Microwave is widely used in radar, communications, anticipation, detection, military, industrial food processing and other departments.
Because of the existence of these injuries, protective glasses must be worn during the production process. It is precisely because of these injuries that protective glasses are particularly important.
Before choosing protective goggles, a risk assessment should be performed on the process to understand the hazards and severity of the process itself, the machine (tool) used, the substances involved, etc., on the eyes. According to the results of the assessment, relevant measures should be implemented to reduce the hazards to the eyes of the process, and not to rely on protective glasses to protect the eyes of employees. However, it must be noted that some dangerous processes such as arc welding, oxyacetylene or similar processes for metal welding or cutting, hand-held guns to push tools, employees must wear protective glasses.
The use of safety glasses should consider the type of work and risk assessment results of employees to make the right choice. For example, employees are responsible for diluting the disinfectant. Generally, protective goggles can protect against eye damage caused by such chemicals. If employees are required to perform welding procedures, they must use a protective goggles with filter function.
Welding goggles consist of frames (frames), filters, and protective sheets. Production welding goggles should be produced according to the corresponding standards. The main requirements are as follows:
Welding eye protector material:
1, should have a certain degree of strength, flexibility and rigidity;
2, can not use harmful to the skin or flammable materials;
3, the material used in the hood headband is soft and durable.
Welding glasses structure:
1. Smooth surface, no burr, no sharp corners, or other defects that may cause facial discomfort;
2, adjustable parts should be flexible and reliable, structural parts should be easy to replace;
3, should have good air permeability.
Optical properties:
1, the surface quality and internal flaws. The center of the lens should be smooth, evenly colored, free of scratches, streaks, bubbles, mildew, orange peel, hues, foreign objects, or other defects that impair optical performance.
2, the protective sheet visible light transmittance. Colorless transparent lenses, visible light transmittance should be greater than or equal to 0.89. 3, welding filter color. Can not use simple colors, it is best to use yellow, green, brown and gray mixed colors. Left and right eye filter color difference, optical density value shall not exceed 0.4. 4, welding filter transmittance.

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