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AC 43.13-1B 9/8/98 FIGURE 3-9. Sample bagging layup cross section. a. The materials used for most bonded repairs require elevated temperatures and pres sure, during their cure, to develop full strength. The following paragraphs describe the opera tions required to enclose the repair in a vac uum bag. When the part to be cured can be placed in an autoclave, additional pressure and heat can be applied. For cured-in-place parts, vacuum pressure and portable heat blankets usually suffice. (1) When selecting materials, especially the parting agent film, the temperature at which the repair is to be cured must be known. Polyvinyl alcohol (PVA) film is ideal when the bonding temperature does not exceed 250 °F. PVA film has very high tear resistance and may be heat-sealed effectively. When the bond temperature is not above 180 °F, polyvinyl chloride film can be used. For temperatures up to 450 °F, a polyvinyl fluoride film is used. These three types of films are available in a va riety of weights and widths. Most nylon bag ging films are used for temperatures up to 400 °F. (2) When all repair details are in place and ready to be cured, they are enclosed in a bag of plastic film or thin rubber. Air is re moved from the bag by a vacuum source so that atmospheric pressure exerts a pressure on the repair as it is cured. (3) To provide a path to draw off the air initially inside the bag, layers of fiberglass cloth or similar noncontaminating materials, known as breather plies, are placed inside the bag. When prepreg is being cured as part of the repair, it is sometimes necessary to bleed off excess resin. To do this, layers of fiber glass cloth or similar materials known as bleeder plies are placed over the prepreg. Some repairs have been made with a net resin prepreg that does not require bleeding, and therefore does not require bleeder plies. Po rous separator plies or film are used between the prepreg and the bleeder and nonporous separator plies or film are used between the bleeder and breather plies to control the flow of resin. Page 3-6 Par 3-4PDF Image | AFS-640
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