Science plays a huge part in designing sunglasses. These eyepieces are designed to protect people’s visual organs both from damaging Ultraviolet radiation and excessive light. These things were made initially to dim the glare from bright light from the sun.
Early models were made from tinted glasses with dark tints. It is thought to be a lot better compared to light hues since they screen out more brightness. Two developments changed this conventional perception; one was people’s understanding of the light’s nature, especially the UV end of the spectrum, which led to the development in lens manufacturing, and the other was the huge improvements in plastic materials which brought about a considerable change in the manufacturing of frames.
It is a swift development in creating new plastics and metals that helped shape the nature of these eyepieces. These things could be both strong and light, while lenses could be shaped into almost any curvature without losing visual clarity. Metals like gray-silver titanium have become pretty famous for their corrosion-resistant, durable, and lightweight properties, as did titanium-based alloys.
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Fixtures made of stainless steel and aluminum have excellent resistance to heat, scratching, and corrosion. But it is the evolution in plastic materials that made the most significant impact. Multi-colored creations like zylonite become the rage while eyepieces used in various sporting activities preferred nylon-based acetates.
Raw materials used
Most modern eyepieces are composed of light-filtering lenses held in frames made from colored plastics. Glass lenses and metal frames are now less common as polycarbonate compounds, and cellulose acetates have improved. Cellulose acetates used to make most eyepiece frames are derived from wood or cotton pulps.
The natural cellulose is then combined with chemical compounds like acetic anhydride to make cellulose acetate flakes. These flakes are ground into fine powders and blended with plasticizers to generate granules which can be mixed with various colored pigments and melted to make thermoplastic blocks. The outcome of this procedure is materials that are both strong and flexible.
These plastics’ other functional properties include excellent machinability, aesthetic appeal, hypo-allergenic properties, and high-impact resistance. As a matter of fact, all these qualities are needed to make quality and high-performance sunglasses.
Advances in eyewear manufacturing
A lot of plastic eyepiece frames like Off-White Sunglasses are molded from cellulose acetate sheets using a sharp metal die. These sheets are heated to soften them before dying and punching out the design using various heavy pressure. These blanks are cooled, and grooves are cut to help hold the lens.
Rough edges are then polished and smoothed using abrasive brushes before the nose pad is attached to the frame. The same process is used to make the temples or sidearm, and after smoothing, these things are connected to the eyepiece frame using a metal hinge. Completed frames are usually polished a couple of times by tumbling them inside tumbling drums with finer pumice dust.
These frames may also be molded or bent into various shapes between each buff by being heated and pressed into dye to give the needed curvature. The sunglass temple may undergo the same operations to add its final sheen. High-quality controls are essential in this stage, especially for designer sunglasses. The luxury eyepiece industry is pretty competitive, and quality control is very important.