Bending organic glass. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Bending organic glass. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Ham Radio Technologies

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Sheet organic glass [1], like any thermoplastic plastic, can be bent at any angle. The known method involves heating along the bending line of a flat capacitor foil, heated by the current passing through it from the filament winding (5 ... 6,3 V) of any old (tube) network transformer of a TV, radio, etc.

This method is effective, but has one significant drawback - it is dangerous (organic glass is highly flammable!). Local overheating is sufficient, not only the surface of the plexiglass will be damaged, which is also significant, but a fire will also be set up. By the way, the burning of plexiglass can be stopped only if the access of oxygen is blocked, for example, with a rug.

You can confidently avoid a fire if you place the foil in a fluoroplastic tube along the entire length of the foil in contact with the plexiglass. Before pulling the foil into a fluoroplastic tube, for example, using a hard wire, the tube is flattened, ironed with a very hot iron on a flat surface (table) covered with a sheet of fluoroplast. Fluoroplastic softens only at a temperature of approximately 400 ° C, it can be ironed directly with an iron without fear of damage.

Foil, not wire, is used in order to provide a large heating area for plexiglass at the bend. It may not necessarily be aluminum, but copper, thin and flexible, so that you can easily cut a strip of the same width and the required length. A rheostat is needed to regulate the heating. You can do without a rheostat if you use 6..12 V car battery banks for warming up. Then the current can be adjusted by the number of connected battery cans.

A specially prepared wooden lath is used as a template for the required bending angle. You also need a flat wooden rail or ruler to support the heated part of the sheet so as not to get burned. The plexiglass sheet is placed on the table so that part of it, hanging, recedes by the intended bending line from the edge of the table by 1 cm. The foil in the fluoroplastic tube is laid along the bending line, covering the plexiglass sheet from above and below, slightly stretched. Heating is connected and regulated. When the plexiglass sheet becomes plastic (begins to bend under its own weight), we put on top the stencil of the bending angle along the line and bend the plexiglass sheet with a flat rail applied to the sheet from below so that the upward movement force is evenly distributed along the bend line. We hold the slats until the plexiglass has completely cooled. To bend other thermoplastic plastics (viniplast, etc.), you should choose the heating temperature, in all cases, practice, since bending is done vigorously, dexterously, so that the place of heating does not have time to cool.

The fluoroplastic tube allows not only to avoid fire, but also to exclude damage to the plastic at the bend, and preserves its appearance.

Thermoplastic welding. Thin sheet thermoplastic plastics can be welded with the edge of a hot iron through a fluoroplastic film 0,2 ... 0,5 mm thick. To do this, two sheets of polyethylene (polyvinyl chloride) are placed on the edge of the table covered with a strip of such fluoroplast, covered with a second strip of fluoroplast and slowly ironed with pressure so that the edge of the iron falls just along the intended welding line. If welding did not work out once, increase the heating of the iron, repeat.

Thus, the author "dressed" the binders of the magazines "Radio" and "Radioamateur" in plastic covers from old stationery "cases", repairing their open seams or changing the size to fit the magazine. The welded sections are cut after the welding has cooled, leaving a seam 5 mm wide.

Literature

"Radio" 1968, No. 3, p.53.

Author: N.Ivashin, Minsk

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