Shanghai Sunland Industrial Co., Ltd is the top manufacturer of Personal Protect Equipment in China, with 20 years’experience. We are the Chinese government appointed manufacturer for government power,personal protection equipment , medical instruments,construction industry, etc. All the products get the CE, ANSI and related Industry Certificates. All our safety helmets use the top-quality raw material without any recycling material.
Model of safety helmet for civil construction
We provide exclusive customization of the products logo, using advanced printing technology and technology, not suitable for fading, solid and firm, scratch-proof and anti-smashing, and suitable for various scenes such as construction, mining, warehouse, inspection, etc. Our goal is to satisfy your needs. Demand, do your best.
Professional team work and production line which can make nice quality in short time.
The professional team provides 24 * 7 after-sales service for you, which can help you solve any problems
It ensures virtually no distortion and ,refraction, of ,light,. The use of polycarbonate of acrylic sheets is common with most modern LED ,light, systems. Polycarbonate ,Lenses,. Honestly, glass ,lenses, are nearly becoming obsolete. This is because polycarbonate ,lenses, are durable, impact resistant and guarantee optical class 1 properties.
The ,light, reaching your eye (or in this case our camera) coming from the arrow is refracted through the glass of water. In fact the glass of water acts like a convex ,lens, (like you might have in a magnifying glass). Convex ,lenses, bend ,light, to a focal point. This is the point at which the ,light, …
the visible spectrum ,can do, the same. Blue ,light, is the main example which has the smallest wavelength of the whole spectrum and therefore carries the most energy. Prolonged exposure to Blue ,light can, lead to partial blindness and so special ESP ,lenses, have been developed to filter out this part of the spectrum. b. The different parts of the eye
The ,lens, index refers to the “index of ,refraction,,” or how much the ,lens, bends the ,light, that enters it. This ensures that the ,light, is focused properly onto the retina, helping you to see clearly when wearing your glasses. In general, the higher the index, the thinner the ,lens,. (For example, a 1.61 ,lens, is thinner than a 1.50 ,lens,.)
While these ,helmets do, provide rugged and inexpensive ,safety, protection, they also have a few disadvantages. Welding ,helmets, featuring a fixed shade ,can, be more difficult to use because a welder has to lift the ,helmet, every time he or she wants to examine the weldment and joint, set a position and prepare for welding and then flip the ,helmet, down again when it’s time to strike the arc.
The human eye ,can, perceive changes of ,light, in 0.5ms (1/2000th of a second), so your filter needs to switch faster than that to avoid risk of injury. Luckily, most of our welding ,helmets, comfortably meet that mark, like the Bollé Fusion+ Welding ,Helmet, FUSV with a rection time of 0.1ms.
Lenses,: CSA-certified eye and face protectors must meet the criteria for impact resistance as outlined in the standard.Only devices made of approved materials are permitted. Markings: The manufacturer or supplier certification mark must be present on all approved ,safety lenses,, frames (front and temple), removable side shields, and other parts of the glasses, goggles, or ,helmets,.
From a ,safety, standpoint, these types of ,helmets, provide constant UV and IR protection and come with a heat-reflecting front panel. From a welding perspective, the narrow ,helmets can, fit into tight spaces and don't require the extra room needed to flip them up to check welds.
Light, that passes through the pupil opening, will enter the crystalline ,lens,. The crystalline ,lens, is made of layers of a fibrous material that has an index of ,refraction, of roughly 1.40. Unlike the ,lens, on a camera, the ,lens, of the eye is able to change its shape and thus serves to fine-tune the vision process.