The optical glass cleaning agent is mainly prepared by various organic materials, surfactants, inorganic salts and other scientific processes, and is mainly applied to various optical glass lens coatings, such as dirt, dust, fingerprints, oil stains adhered to the surface of the cleaning surface. Residues such as polishing powder. The role of optical glass cleaner: After cleaning the optical glass, the organic solvent cleaning agent and water-based cleaning agent are mainly used.
(1) Cleaning process for organic solvent cleaning Organic solvent cleaner (ultrasonic) - water-based cleaning agent (ultrasonic) - municipal water rinsing - pure water rinsing - IPA (isopropanol) dehydration - IPA slow drawing drying.
The main use of organic solvent cleaners is to clean asphalt and lacquer. In the past, solvent cleaning agents used trichloroethane or trichloroethylene. Because trichloroethane is ODS (Ozone Depleting Substance) products, it is currently in the stage of forced elimination; while long-term use of trichloroethylene is easy to cause occupational diseases, and because trichloroethylene is very unstable, it is easy to hydrolyze and is acidic, thus corroding lenses and equipment. . In this regard, the company developed a non-ODS solvent-based series of cleaning agents, which can be used to clean optical glass; and the series of products have different physical and chemical indicators, which can effectively meet the requirements of different equipment and process conditions. For example, in the production process of a few enterprises, there is a layer of lacquer on the surface of the lens that is difficult to handle, requiring the use of organic solvents with special solubility; some of the cleaning equipments of the company have fewer condensing tubes in the solvent cleaning tank, and the free path is short. The use of slower organic solvents is used; in contrast, other companies require the use of more volatile organic solvents.
(2) The main purpose of the water-based cleaner is to clean the abrasive powder. Since the abrasive powder is an alkali metal oxide, the solvent has a weak cleaning ability, so the abrasive powder generated during the processing of the lens is basically removed in the water-based cleaning unit. Therefore, there is a very high demand for water-based cleaners. In the past, due to the small variety of water-based cleaning agents for optical glass in China, many foreign-funded enterprises have used imported cleaning agents. At present, domestic companies have developed optical glass cleaning agents, and have successfully applied them to several large optical glass production plants in China. The cleaning effect can completely replace imported products, and it is superior to imported in terms of corrosive (anti-corrosion performance) and other indicators. product.
For IPA slow-drawing drying, it should be noted that some types of lenses are prone to watermarking after drying. This phenomenon is related to the purity of IPA and air humidity on the one hand, and has a great relationship with cleaning equipment on the other hand, especially The effect of drying the arms is obviously not as good as that of the one-arm drying. It is necessary for equipment manufacturers and users to pay attention to this point.
Thumb Screws are used almost exclusively for the purpose of simplicity. However, they are also ideal for applications in which space is too restricted to allow enough clearance for the use of tools to fasten the screw.
Designers might choose thumbscrews for household, electronic and other consumer products, not just for the ease of fastening but also to avoid the risk of over-tightening. They are particularly beneficial for assemblies that require repeated removal and reinstallation.
When used for removal-and-reinstallation applications, such as safety covers or access panels, thumb Screws can reduce the amount of time required for maintenance or inspection. Their hand-adjustment design also reduces the incidence of broken or stripped fasteners that might occur with frequent removal and reinstallation.
Thumb screws are not recommended for structural applications or high-vibration environments, such as automotive, railway or marine vehicles, where cyclical loading might cause them to become loose over time.
Fastener length and thread size varies considerably, and many thumbscrews are also available in metric sizes. The length is measured from under the head to the tip of the screw. Materials include brass, nylon, steel, stainless steel, aluminum and plastic. For consumer products, designers might choose a particular material based on its aesthetic appeal.
Thumb Screws
Thumb screws, knurled thumb screws, Knob screw
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