Anti-adhesive coating of rubber components developed.Not all rubber applications are the same, and so in the course of time, new rubber types were developed for the most diverse applications. One characteristic of rubbers, however, sometimes has a negative effect--the sticking to other parts also made of rubber, or of other materials. Examples include o-rings that should remain separated if handled automatically, on-off or relay valves that should switch extremely fast, security valves that should reliably open after being closed for a long time, or rubber isolated plug-type connectors that should be easily unplugged. For all these cases, the company offers the coating of rubber components with Lipocer. The increased sticking tendency observed in elastomers is caused by long-chained, loose elastomer elastomer (ĭlăs`təmər), substance having to some extent the elastic properties of natural rubber. The term is sometimes used technically to distinguish synthetic rubbers and rubberlike plastics from natural rubber. molecules on the surface, which interlock A device that prohibits an action from taking place. with other surfaces. Lipocer occupies the elastomer's surface with an extremely thin, very flexible coating, avoiding the molecular sticking. The coating, with a thickness on the order of a hundred nanometers, follows exactly the microscopic roughness of the elastomer's surface with an extremely good adherence to that surface. The adhesion with an elastomer's surface is maintained even under very high continuous alternating load, and has been demonstrated in examinations with a high-resolution scanning electron microscope scan·ning electron microscope n. Abbr. SEM An electron microscope that forms a three-dimensional image on a cathode-ray tube by moving a beam of focused electrons across an object and reading both the electrons scattered by the object and . Lipocer is deposited in a Plasma-CVD-Process out of the gas phase under vacuum conditions. The pieces to be coated are placed in a vacuum chamber, where a special gas or vapor mixture is fed and ionized i·on·ize tr. & intr.v. i·on·ized, i·on·iz·ing, i·on·iz·es To convert or be converted totally or partially into ions. i by a high frequency electrical discharge Noun 1. electrical discharge - a discharge of electricity discharge - the sudden giving off of energy nerve impulse, nervous impulse, neural impulse, impulse - the electrical discharge that travels along a nerve fiber; "they demonstrated the transmission of . This ionized gas is called plasma. The high-energy particles in the plasma trigger a chemical reaction in the gas mixture, producing a coating material coating material, n a biologically acceptable, usually porous nonmetal applied over the surface of a metallic implant with the expectation that tissue ingrowth will occur in the pores. Often a carbon polymer or ceramic substance. that precipitates onto the surface of components inside the chamber. Previous to the plasma coating itself, the components inside the chamber are plasma pretreated, ultra fine cleaned and activated, in a non-coating gas mixture. During the coating process itself, the surface continues to be exposed to a continuous bombardment by electrons and ions. Through this constant excitation excitation Addition of a discrete amount of energy to a system that changes it usually from a state of lowest energy (ground state) to one of higher energy (excited state). For example, in a hydrogen atom, an excitation energy of 10. , the coating is firmly anchored to the surface, achieving an excellent adhesion, without negative changes in the bulk properties of the elastomer component. The elasticity remains without a change of properties. Valves are a huge application field, especially if fast reaction time is required, as could be in a rapid control action or when a valve standing closed for a long time suddenly must open fast and sure. Avoiding the sticking of parts made of the same elastomer material is another application field, as in the case of rubber isolated plug-type connectors, where a very close rubber-to-rubber contact takes place. Limited help has been reached greasing rubber components, but with time, the positive effect faded away when the grease diffused into the rubber. Lipocer offers a permanent solution. Greasing parts that are in contact with food or medical products is not permitted, and Lipocer coating can provide a dry and abrasion abrasion /abra·sion/ (ah-bra´zhun) 1. a rubbing or scraping off through unusual or abnormal action; see also planing. 2. a rubbed or scraped area on skin or mucous membrane. resistant lubricant Lubricant A gas, liquid, or solid used to prevent contact of parts in relative motion, and thereby reduce friction and wear. In many machines, cooling by the lubricant is equally important. for smooth and easy running, for instance, in valve seats. Lipocer is resistant to most acids, caustic solutions and solvents, and therefore it can be used as a protection for elastomer parts. The coating could be done on finished or semi-finished products. Small parts, as some o-rings for instance, can be coated in a rotary drum, and flat seals can be coated on one side, placing them over a fiat electrode electrode, terminal through which electric current passes between metallic and nonmetallic parts of an electric circuit. In most familiar circuits current is carried by metallic conductors, but in some circuits the current passes for some distance through a . It is irrelevant if the coating is done on the already punched flat seal or on the sheets from which the seals will be later punched. Flat seals should be turned if coating of both sides is required. It is also possible to plasma coat rubber seals already installed in their holding device, under the condition that plasma has a "free sight" into the surface to be coated. Three-dimensional elastomer pieces can also be coated, with some limitations, without the requirement of moving the parts. The company offers test coating of samples for first trials. In case of success, the company designs and builds a plasma unit according to according to prep. 1. As stated or indicated by; on the authority of: according to historians. 2. In keeping with: according to instructions. 3. customer requirements. The firm uses its standard units Standard units may refer to:
Plasma Electronic Circle 7 on card [ILLUSTRATION OMITTED] |
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