These films are traditionally made from “nylon” and or nylon derivatives. Temperature capabilities vary from as low as 80°C to as high as 425°C. Certain types of resin systems, like phenolics, could have a negative effect on nylon films. If using phenolic resin systems, choose bagging films that are compatible with the resin system. There […]
There are many types of release films, and like vacuum bagging films, vary in their capabilities. Release films are traditionally the most expensive part of the vacuum bagging stack. Release films are available in different perforation styles, depending on the application. P3 perforation is the most common.
Sealant tapes are a sticky type of butyl tape that ensures a good seal between the bagging film and the tool / mould surface. There are many types, but traditionally are classified according to the temperature rating. Good quality sealant tapes should stick well, hold the seal during the curing cycle, and then be able […]
Peelply fabrics are normally a smooth, tightly woven nylon or polyester fabric. Other fibres like glass and Aramid are also used, but only for certain applications. If phenolic resins are used, it is advisable not to use nylon, but rather a polyester type peelply. It is important to remove the peelply fabric before the part […]
Breather fabrics are normally a type of uncompressed felt, also called spun-bonded, needled felt. Various types and thicknesses are available depending on the temperature, pressure and resin type. The breather aids in removing air and volatiles from the laminate, and transports them across the surface to the vacuum port, as well as allowing the vacuum […]
Vacuum Infusion is a term used to laminate the part dry, and then allow the resin to flow into the dry fibres. These materials are generally normal vacuum materials, with a few differences. There is no requirement for a breather or release film, but an infusion mesh that transports the resin inside the bag to […]
As with the vacuum film itself, there are many variations and careful consideration is required when choosing the correct equipment. Autoclave heat and pressure will collapse a pipe that is not constructed from the correct materials, as will normal vacuum at room temperature collapse an unsuitable one. Most vacuum pipes have a wire spiral either […]
Again there are many types of vacuum pumps. Vane pumps can work dry, in oil or in water with electric motors. There are also venturi pumps that work with water or compressed air. All pumps need some protection from excess resin entering the vacuum lines and into the pump. The danger of this is much […]
There are two types of leak detectors that are available. One is a simple visual indicator, and the other is an ultrasonic noise detector that is converted to a noise that we can hear through a set of earphones.