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By R. K. Bansal

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Extra info for A Textbook of Strength of Materials (In S.I. Units)

Example text

If so, the initial part of the drawing should be cured to prevent the resin from gelling outside the mold and around it. Usually, drawing machines are composed of two separated parts along a horizontal plane parallel to the pultrusion direction. In the case of simpler sections, for instance, bars, single-block molds are used, obtained by piercing it and then smoothing the hole that can also be chromium-coated with specific techniques. The finishing of the product surface is positively impacted by the absence of joints in the molds.

4). 7 Autoclave Forming The use of autoclave technology to produce composite members allows for the manufacturing of sheets with very high mechanical properties compared to the more traditional and cost-effective technologies described herein (Fig. 5). 7 Autoclave Forming 33 Fig. 5 Autoclave machine (Italian Composite srl) The use of an autoclave allows for an enhancement of compaction with an increase of pressure during the cycle of up to nearly 7–10 atm and temperatures up to 2,000 °C. The most up-to-date autoclaves offer different possibilities to adjust the pressure and temperature during the polymerization cycle in compliance with the most suitable law for each type of resin used.

The inlet should have a taper of nearly 7–10°, whose function is to eliminate the excess resin. This trick is less useful in the case of a preforming system already equipped with a device for eliminating excess resin. The laid up chromium layer can even double the mold durability. Generally, it can be assumed that a drawing machine should produce, on average, between 20,000 and 30,000 m of pultruded product before performing the successive chromium coating. In any case, this operation cannot be repeated indefinitely, since it damages the steel underlayer of the drawing itself.

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