Spectacle frames

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  • Finding eyeglasses with the qualities that are most important to you could be as simple as choosing the right frame material, because each type has its own unique strengths. If you want the colors of the rainbow, then zyl (zylonite, or cellulose acetate) is your material.
  • Eyeglasses made of nylon first were introduced in the late 1940s. Because of brittleness and other problems, eyeglass manufacturers switched to blended nylon (polyamides, co-polyamides and gliamides). Monel - a mixture of any of a broad range of metals is the most widely used material in the manufacture of eyeglass frames. Its malleability and corrosion resistance are pluses.
  • Many frame manufacturers offer titanium and beta-titanium styles these days. Beryllium, a steel-gray metal, is a lower-cost alternative to titanium eyewear. Stainless steel frames and surgical stainless are another alternative to titanium.
  • Flexon is a titanium-based alloy. This unique and popular material, originated by the eyeglass manufacturer Marchon, is called a "memory metal": frames made of Flexon come back into shape even after twisting, bending and crushing. Flexon frames are lightweight, hypoallergenic and corrosion-resistant.
  • Frame sizes are usually in the format 50□20 In this case, this means that the lens diameter is 50mm and the bridge distance is 20mm. You may use this as a guideline by comparing them to your own glasses
  • Spectacle frames are made in two parts that is one is the front which holds the two glasses and the other is the two sides which are fitted on each of the front. There are more people today wearing spectacles as a creative treasure and many more use sun glasses. Thus plastic frames which are trendy and fashionable have a ready market and their prices are relatively low.
  • The materials most commonly used to make eyeglass frames are either metal or a cellulose acetate type of plastic. This type of plastic is made from cotton and known to be strong and flexible. Eyeglass frames are made using a die-cutting process. The sheets of plastic are first placed into an oven where it will heat up enough to be softened and easy to work with. The plastic is then inserted into a blanking machine where pieces are punched out, representing where the lenses will be positioned.
  • The front of the eyeglasses is finished by using a router tool to cut the standard 0.16 inch wide grooves that will hold the lenses inside the frames. Next, the bottom and nose areas of the frames are smoothed down with abrasive machines and, if applicable, the nose pads are attached with glue. Finishing the front of the eyeglasses consists of shaping them to the tilt angle of a face from top to bottom.
  • The upper edges are cut with an automatic saw, and then the frames are heated, mounted in a curved forming die, placed in a press and, finally, hardened into shape with a cold water bath. The temples that curve over the ears are cut from the same sheets of plastic as the front of the frames, and once it's softened a core wire is added to help produce shape. The temples are sturdily bonded to the frames using heat friction and a capitron machine. Finishing the temples has a lot to do with the style of eyeglass frames being made and are matched accordingly.

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