Eyeglass frame

Decorative. Titanium nitride has a golden color and is used extensively to coat steel and cemented carbide substrates for watch cases, watch bands, eyeglass frames, etc. It provides exceUent scratch resistance as weU as the desired aesthetic appearance, and it replaces gold coatings used previously. 

In consumer appHcations, titanium is used in golf club heads, jewelry, eyeglass frames, and watches. The Japanese have promoted the use of titanium in roofing and monuments. Other appHcation areas include nuclear-waste storage canisters, pacemaker castings, medical implants, high performance automotive appHcations, and ordnance armor. 

Eyeglass frames made of cellulose acetate plasticized with diglycerol esters do not exhibit opaqueness at the frame-lens junction with polycarbonate plastic lenses (146,147). 

Human engineering. While the designer usually regards the problems of space limitations as being appearance related, they are most often the outcome of the ID s concern for human engineering, or the proper relationship of the product to the human body. For example, personal computers should be small enough to be carried by many people, coffee-cup handles should be comfortable to the hand, eyeglass frames should be easy on the ears, etc. 

Cellulosic They are tough, transparent, hard or flexible natural polymers made from plant cellulose feedstock. With exposure to light, heat, weather and aging, they tend to dry out, deform, embrittle and lose gloss. Molding applications include tool handles, control knobs, eyeglass frames. Extrusion uses include blister packaging, toys, holiday decorations, etc. Cellulosic types, each with their specialty properties, include cellulose acetates (CAs), cellulose acetate butyrates (CABs), cellulose nitrates (CNs), cellulose propionate (CAPs), and ethyl celluloses (EC). 

While other organic esters are commercially available, namely cellulose butyrate and cellulose propionate, by far the most widely used is cellulose acetate, which is available as plastics, in films, sheets, fibers, and lacquers. Cellulose acetate is used in the manufacture of display packaging and as extruded film for decorative signs, and to coat a variety of fibers. Injected molded products include toothbrush handles, combs, and brushes. It is also used in lacquers and protective coatings for metal, glass, and paper. Cellulose acetate films are used in reverse osmosis to purify blood, fruit juices, and brackish water. Some eyeglass frames are... 

Although cellulose nitrate is now used for eyeglass frames and piano key coverings, it is rapidly being replaced by less flammable materials. 

Acetate and propionate are widely used in eyeglass frames because their properties are well adapled to the post-finishing operations needed. Cellulosics arc frequently used for a variety of home furnishing products, such as table edging and Venetian blind worlds, and fixtures. The clarity of the finished plastic is desirable for such applications... 

In flatwire form, they compete with beryllium copper for eyeglass frames, circuit boards, and electronic-contact clips. The alloys also have been used for rivets, self-threading screws, and a variety of coldheaded parts. 

As previously mentioned, the nickel—titanium alloys have been the most widely used shape memory alloys. This family of nickel—titanium alloys is known as Nitinol (Nickel Titanium Naval Ordnance Laboratory in honor of the place where this material behavior was first observed). Nitinol have been used for military, medical, safety, and robotics applications. Specific usages include hydraulic lines capable of F-14 fighter planes, medical tweezers, anchors for attaching tendons to bones, eyeglass frames, underwire brassieres, and antiscalding valves used in water faucets and shower heads (38,39). Nitinol can be used in robotics actuators and micromanipulators that simulate human muscle motion. The ability of Nitinol to exert a smooth, controlled force when activated is a mass advantage of this material family (5). 

Eyeglass frames made from superelastic NiTi absorb very large deformations without damage. Medical uses of NiTi include guide wires for steering catheters in the body and wires for orthodontic corrections. 

How can the eyeglass frames shown in the photo "remember" their original shape How do braces move your teeth These items may be made of a shape-memory alloy that has a remarkable property. It reverts to its previous shape when heated or when the stress that caused its shape is removed. 

Inferring Twisted nitinol-wire eyeglass frames unbend at room temperature. Is the transition temperature of the frames above or below room temperature ... 

Used as low-temperature-resistant and low-viscosity plasticizer for PVC and its copolymers and cellulose esters, e.g., cellulose acetate butyrate, and cellulose propionates. May be found in eyeglass frames, safety goggles, animal collars, decorative trims and various types of film. 

Use Pen and pencil barrels, telephone bases, eyeglass frames, tool handles, sheeting, steering wheels, etc. 

Inferring Twisted nitinol-wire eyeglass frames 2. Applying Design a simple lever that could be unbend spontaneously at room temperature. raised and lowered smoothly using nitinol... 

It is used mainly in the manufacture of cellulose acetobutyrate, the preferred cellulose ester for molding powders. Cellulose acetobutyrate (CAB) and cellulose acetate (CA) are commonly used for eyeglass frames. Cellulose acetobutyrate is used for automotive applications such as steering wheels. 

Malleability Most metals can be hammered or rolled into sheets, which means that they are malleable. Their flexibility allows them to be ductile, or drawn into wires. These characteristics are another reason that metals are found in electronic products, as well as objects such as eyeglass frames. 

Permyl . OFerro/Bedford] Proprietary light stabilizer, uv absorber for polymers (fiberglass-polyester cornigat outdoor panels PVC film for outdom use extruded garden hose cellnlosic eyeglass frames). 

Cellulose nitrate is derived from cellulose, a natural polymer. The first truly man-made plastic came 41 years later (in 1909) when Dr. Leo Hendrick Baekeland developed phenol-formaldehyde plastics (phenolics), the source of such diverse materials as electric iron and cookware handles, grinding wheels, and electrical plugs. Other polymers — cellulose acetate (toothbrushes, combs, cutlery handles, eyeglass frames) urea-formaldehyde (buttons, electrical accessories) poly(viryl ehloride) (flooring, upholstery, wire and cable insulation, shower curtains) and nylon (toothbrush bristles, stockings, surgical sutures) — followed in the 1920s. 

One of the most promising consumer uses of Nitinol is for eyeglass frames. Nitinol is also now being used for braces to straighten crooked teeth. 

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