Electrical insulating varnished fabrics (varnished fabrics). Scheme, description

Free technical library

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
Free library / Schemes of radio-electronic and electrical devices

Electrical insulating varnished fabrics (varnished fabrics). Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / Electricity for beginners

Comments on the article

Varnished fabrics are flexible materials consisting of fabric impregnated with varnish or some kind of electrical insulating compound. The impregnating varnish or composition after curing forms a flexible film, which provides good electrical insulating properties of the varnished fabric. Depending on the fabric base, varnished fabrics are divided into cotton, silk, nylon and glass (fiberglass).

As impregnating compositions for varnished fabrics, oil, oil-bitumen, escapone and organosilicon varnishes, as well as organosilicon enamels, solutions of organosilicon rubbers, etc. are used.

Silk and nylon varnished fabrics have the greatest extensibility and flexibility. They can operate at temperatures up to 105°C (class A). All cotton varnished fabrics belong to the same class of heat resistance.

The main areas of application of varnished fabrics are: electrical machines, apparatus and low voltage devices. Varnished fabrics are used for flexible coil and slot insulation, as well as various electrical insulating gaskets.

Author: Smirnova L.N.

See other articles Section Electricity for beginners.

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

Air trap for insects 01.05.2024

Agriculture is one of the key sectors of the economy, and pest control is an integral part of this process. A team of scientists from the Indian Council of Agricultural Research-Central Potato Research Institute (ICAR-CPRI), Shimla, has come up with an innovative solution to this problem - a wind-powered insect air trap. This device addresses the shortcomings of traditional pest control methods by providing real-time insect population data. The trap is powered entirely by wind energy, making it an environmentally friendly solution that requires no power. Its unique design allows monitoring of both harmful and beneficial insects, providing a complete overview of the population in any agricultural area. “By assessing target pests at the right time, we can take necessary measures to control both pests and diseases,” says Kapil ... >>

The threat of space debris to the Earth's magnetic field 01.05.2024

More and more often we hear about an increase in the amount of space debris surrounding our planet. However, it is not only active satellites and spacecraft that contribute to this problem, but also debris from old missions. The growing number of satellites launched by companies like SpaceX creates not only opportunities for the development of the Internet, but also serious threats to space security. Experts are now turning their attention to the potential implications for the Earth's magnetic field. Dr. Jonathan McDowell of the Harvard-Smithsonian Center for Astrophysics emphasizes that companies are rapidly deploying satellite constellations, and the number of satellites could grow to 100 in the next decade. The rapid development of these cosmic armadas of satellites can lead to contamination of the Earth's plasma environment with dangerous debris and a threat to the stability of the magnetosphere. Metal debris from used rockets can disrupt the ionosphere and magnetosphere. Both of these systems play a key role in protecting the atmosphere and maintaining ... >>

Solidification of bulk substances 30.04.2024

There are quite a few mysteries in the world of science, and one of them is the strange behavior of bulk materials. They may behave like a solid but suddenly turn into a flowing liquid. This phenomenon has attracted the attention of many researchers, and we may finally be getting closer to solving this mystery. Imagine sand in an hourglass. It usually flows freely, but in some cases its particles begin to get stuck, turning from a liquid to a solid. This transition has important implications for many areas, from drug production to construction. Researchers from the USA have attempted to describe this phenomenon and come closer to understanding it. In the study, the scientists conducted simulations in the laboratory using data from bags of polystyrene beads. They found that the vibrations within these sets had specific frequencies, meaning that only certain types of vibrations could travel through the material. Received ... >>

Random news from the Archive

New life for polyurethane waste 04.09.2019

A team from the University of Illinois (USA) has developed a method for breaking down polyurethane, which allows it to be turned into other useful products. The scientists presented the results of their work at the National Meeting of the American Chemical Society.

Polyurethane is a plastic polymer material. It is found in many objects around us: in paints, car parts, furniture padding, home insulation materials. As they fall into disrepair, these items are sent to landfill and incinerated - releasing toxic by-products. The composition of polyurethane includes two components that are difficult to destroy: isocyanates, which are composed of nitrogen, carbon and oxygen; and alcohol groups called polyols.

"Polyols are usually petroleum-based and non-degradable," said graduate student Ephraim Morado, who developed the technology with his supervisor, Steven Zimmerman. To solve this problem, the team included in the polyol a chemical unit that breaks down more easily, acetal. And because polyurethanes are water resistant, the researchers invented an acetal unit that decomposes in water-free solvents.

The scientists added a combination of trichloroacetic acid and dichloromethane to the starting material - as a result, the material swelled and began to decompose rapidly at room temperature. The resulting degradation products can then be redirected to new materials. For example, researchers have been able to turn elastomers - a type of polyurethane used in rubber bands, packaging and car parts - into adhesives.

The authors of the new technology are also testing it on other polyurethane materials. They also plan to experiment with milder solvents such as vinegar to break down the polyurethane.

Other interesting news:

▪ Li-ion solid electrolyte transistor

▪ Heart computer

▪ Logitech G Pro X Superlight Ultralight Wireless Mouse

▪ Ford Mustang Lithium Electric Muscle Car

▪ RealSense webcams

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ section of the site Signal limiters, compressors. Article selection

▪ article Constructing a shadow. Tips for the home master

▪ article How did the state civil service arise? Detailed answer

▪ article Work on the washing machine. Standard instruction on labor protection

▪ article Curtains with electric drive and remote control. Encyclopedia of radio electronics and electrical engineering

▪ article Magic frame for cards. Focus Secret

Leave your comment on this article:

All languages of this page

Home page | Library | Articles | Website map | Site Reviews