Advanced Polymer Processing Operations by Nicholas P. Cheremisinoff

By Nicholas P. Cheremisinoff

This quantity covers complex polymer processing operations and is designed to supply an outline of a few of the most recent advancements for distinctive items and fabrication equipment. participants for this quantity are from either and academia from the overseas neighborhood. This publication comprises 9 chapters overlaying complicated processing purposes and applied sciences.

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It is then cut, removed from the cylinder, flattened out and impregnated with resin. The sheets thus formed are compression molded and the products have quite high mechanical strengths. Chopped strands can be also incorporated into an X-pattern to improve the strength further. WET LAY-UP PROCESSES In these processes there is usually only one half of the mold, and the item to be produced comes out in the form of this mold. The resin has low viscosity without fillers and much additives, and it is spread on the continuous glass fibers stationed in the mold.

The thickness is controlled by the operator and sufficient thickness can be built up in sections likely to be highly stressed. The success highly depends on the skill of the operator. The main advantage of this method is that the equipment is portable, therefore on- site fabrication can easily be accomplished. In addition, low cost molds can be used and complex shapes with reverse curves can be formed more easily than the hand lay-up process. The spray-up process is used in making boats, display signs, truck roofs and other roofings, and in lining tanks.

In addition to chopped roving, continuous glass fibers can also be used in making sheet molding compounds. Continuous glass fiber is directly fed to the system without having a chopper in Figure 5. This material has a high unidirectional strength. The resin impregnated sheet thus formed can be cut into pieces and wound on a mold surface in a traversing manner with certain angles, and then molded. Sheets with both unidirectional fibers and chopped fibers can be produced by introducing a continuous strand roving feed mechanism to Figure 5 in between the chopper and the upper plastic carrier film.

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