Pneumatic Forming

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Pneumatic Forming

 

a means of forming items from sheet thermoplastic polymers.

In pneumatic forming, the blank, which is 1.5–10 mm thick, is fastened to the edges of the mold, heated to a temperature at which the polymer is in the high-elastic state, and formed into the item by the action of compressed air at an excess pressure of 50 -2,500 kilonewtons per sq m, or 0.5–25 kilograms-force per sq cm. The main methods of pneumatic forming are negative, positive, and free forming, which are analogous to the methods used in vacuum forming. The advantage of pneumatic forming over vacuum forming lies in the possibility of varying the excess pressure on the blank over a wide range, which makes possible the forming of items from thicker sheets.

An advanced method for the production of items with thick walls is the combination of pneumatic forming with mechanical forming—for example, in a press (mechanopneumatic forming). Pneumatic forming is used for the manufacture of parts for aircraft windows, various sanitary and household items (for example, baths, sinks, and parts for refrigerators), and containers.

REFERENCES

Entsiklopediia poiimerov, vol. 2. Moscow, 1974.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
The Pneumatic Forming of Hardened Concrete Construction Principle
The presented paper describes the design of the shape concrete shell bridge constructed with the newly invented construction method Pneumatic Forming of Hardened Concrete (PFHC).
Kollegger, "Application areas for pneumatic forming of hardened concrete," Journal of the International Association for Shell and Spatial Structures, vol.
Kollegger, "Pneumatic forming of hardened concrete--building shells in the 21st century," Structural Concrete, vol.