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What are nylon lenses？
21-08-27 16:03:14 By Bestsea eyewear
What are nylone lens? The lens in the picture below is a nylon lens, the left is an ordinary nylon sunlens, and the one on the paper is a nylon polarized lens.
The problem mentioned in the video that the nylon lenses were not hard enough and easily scratched has now been well solved. When we choose lenses, we only use nylon lenses made of high-quality materials, and a strong protective layer must be added to the surface. Since this layer is transparent, it will not affect the optical performance of the lens, but it can well protect the lens from scratching.
Lenses are the most important part of glasses. They also give glasses various vision protection functions, such as optical lenses provide vision correction, and sun lenses provide UV protection，etc. As a professional sunglasses manufacturer, although we do not produce nylon lenses ourselves, we must master the craftsmanship, functions, and inspection and testing methods of lenses to ensure that the best quality lenses are installed on the eyeglass frames. This article mainly introduces nylon lenses.
The nylon lenses is made of nylon material, which is a transparent polyamide, which breaks the regularity of molecules by introducing side groups into the molecular chain and inhibits the formation of crystals, thereby obtaining transparent polyamide. Nylon lenses are widely used in eyewear of various materials because of their good light transmittance and strong toughness, including acetate glasses, metal glasses and titanium glasses, especially half-frame, rimless and glasses with less regular lens shapes.
Nylon lenses for rimless metal sunglasses
The acetate sunglasses in the picture above use nylon Sunlens. The edges of the lenses are cut into L-shaped steps and embedded in the frame. The excellent toughness of the nylon lenses ensures that they will not break.
The picture above is a pair of inflatable sunglasses made of acetate fiber. It uses an integrated nylon sunglass lens. The nylon lens has excellent toughness and can ensure that the narrow part of the middle lens will not break.
Features of nylon lenses. The main features of nylon lenses are good toughness, strong impact performance And good transparency (slightly worse than CR39). The main disadvantage is that the wear resistance is worse than CR39, and the production cost is higher than CR39. It is one of the most commonly used sunglasses lenses.
Rimless metal sunglasses, nylon lenses can be drilled, grooves carved, etc., have very good toughness and strength.
The craft of nylon lenses. Customize the mold according to the size, thickness, and curvature of the lens, and then use nylon material to inject it.
Pictured above is a design for a pair of half-rim acetate sunglasses with gradient nylon sun lenses.
The craft of nylon lenses 1: Add color. Single color (such as single gray, single brown, etc.) is made by adding a certain proportion of toner to nylon material, so it has stable color and will not fade for a long time. The color gradient (such as gradient Grey, brown, green, etc.) is similar to CR39 dyeing process.
The craft of nylon lenses 2: UV400, coating process, back blue (or other colors), waterproof effect, oil-proof effect, the process is similar to CR39.
The craft of nylon lenses 3: Hard coating. Because the hardness of nylon lens itself is not very high, it is usually add hard coating. The hard coating process is the same as CR39.
NPictured above is a pair of metal sunglasses that have irregular frames so nylon lenses must be used.
The craft of nylon lenses 4: Coating. Common coating colors include gold, silver, blue, green,orange, etc. Generally, a vacuum coating machine is used to attach different pigments to the surface of the lens layer by layer, and finally become the desired one. Coated single are also one of the most popular coating. The back blue (or other colors) is also after the coating process, that is, a layer of coating is coated on the back of the lens. It can effectively absorb some light reflections from the back. Another function is hardly see the eyes while wear back blue sunglasses.
The craft of nylon lenses 5: Waterproof and oil-proof process. After the strengthening process, a waterproof or oil-proof film can be added according to customer requirements. Waterproof identification method: Sprinkle some water on the lens, stand the lens up, the water will immediately harvest into drops and drip easily. The ones that are not waterproof are not easy to harvest and drip. Anti-oil identification method: Use an oil-based pen to draw on the surface of the lens, the vertical color will shrink into a drop shape, and then wipe it off with a cloth. It is not oil-proof, that is, it does not shrink into drops and is difficult to wipe off. According to requirements, only waterproof or waterproof effect can be added, or both effects can be added, that is, oil-proof and waterproof. According to requirements, general water and oil repellent effects can also be made, or super water and oil-proof effects can be made (that is, the effect of oil-proof and waterproof is particularly good).
The nylon lenses with water-proof
How to identify nylon lenses. This is mainly for nylon and PC lens. 1) Knife bracket method: Use a utility knife to wrap it on the side. The powdered one is CR39. Nylon and PC are silky. 2) Shape recognition method: CR39 lenses generally do not have a handle, and nylon and PC lenses have a handle. 3) Voice recognition method: Use your fingers to flick the surface of the lens, CR39 sounds solid and heavy, nylon is relatively brittle, and PC film is the most brittle.
Pure nylon lens and composite nylon lens. The difference between the two lenses is that the material used in the composite nylon lens is not a pure nylon material, it is mixed with some other cheap materials, or recycled nylon materials that have been used many times. Therefore, the toughness and light transmittance of the composite nylon lens is a little worse than that of the pure nylon lens, and it is not suitable for the production of rim-less and some frames with higher requirements. The two kinds of lenses can be viewed by placing the back of the lens under bright light. The composite nylon lens can easily see the slight wave pattern effect; with a knife, the silky shape of the pure nylon lens is more obvious and complete.
The picture above is a pair of rimless metal sunglasses. It uses pure nylon sunlens, which has better toughness and strength, so it can drill holes and engrave patterns on it.
Some of the glasses below are also better suited for nylon lenses.
The materials of the above sunglasses are mainly acetate and pure nylon Sunlens. The acetate end piece and nose bridge are fixed on the nylon lens with screws. Because pure nylon lenses have very good toughness, they can make the glasses very strong. These characteristics are not available in other lenses, such as CR39 lenses, TAC lenses, PC lenses or glass lenses, etc.
Above is a pair of rimless metal sunglasses. The upper metal eyebrow and the lower metal strip are fixed on the lens through screws. The toughness of nylon lenses can well ensure the stability of the glasses structure, is not easy to break, is strong and durable, and has good optical properties, such as light transmittance, etc.
Above is a pair of irregular metal sunglasses with square corners. We can see from the picture that there are many parts of the lens that are at 90-degree right angles. This kind of pure nylon sunglasses must be made of high-quality materials to ensure that they are not cracked and damaged. In fact, for irregular frames, or if the curvature of the frame is greater than 45 degrees, it is recommended to use nylon lenses to get better protection.
