Is a plastic film electrically insulating



Plastic film, colloquial too Plastic wrap called, is a thin (

Base material

Plastic films often consist of polyolefins such as high and low density polyethylene (PE) or polypropylene (PP). In addition, polyvinyl chloride (PVC), polystyrene (PS), various polyesters and polycarbonate (PC) are also suitable. In contrast, cellophane is made from cellulose (process analogous to viscose, but from slot nozzles), but can be coated with plastic film.

Multi-layer composites are often made from a combination of different plastics. This allows certain properties, such as the permeation behavior, to be improved.

The production of polycarbonate film was discontinued in 2000 because the small production volume with the plastic film capacitor as the sole application became uneconomical.

properties

The main characteristic of plastic films is their ability to be wrapped on or around objects and to adapt to their shape. Typical film thicknesses are in the range below 0.1 mm. As electrical insulating foils, they can also be only 0.002 mm thick in some cases. The tear strength is between 20 and 300 N / mm², depending on the material, but is often different along and across the direction of extrusion. The elongation at break can easily reach several hundred percent.

Plastic films can be colored in many colors, but with some materials they can also be made completely transparent. In this case one also speaks of Cling film.

They are mostly electrically insulating, but are made conductive by modifiers, especially for the packaging of statically sensitive electronic components.

The mechanical load-bearing capacity can be increased by reinforcing with glass fibers or adding a braid. Certain polymers or additives also increase the thermal load capacity, e.g. B. with foils for photocopiers or laser printers.

Manufacturing

Plastic films are mostly produced by extrusion. In addition, they can also be manufactured by casting, calendering or blow molding.

use

Plastic films are often used as packaging, the covering of building materials and the (mostly temporary) lining of openings. Other construction foils are used to isolate different layers. In geotechnical engineering, so-called geotextiles are used, with which subterranean layers are isolated from each other or - for example in landfills - are also used to collect the landfill gases.

Clear foils (Transparencies) serve as carrier material for writable overhead transparencies for overhead projectors or for the light-sensitive layer of films.

Films are also used in agriculture (film culture).

Plastic film products

Category: Plastic