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External vacuum sealers involve a bag being attached to the vacuum-sealing machine externally. The machine will remove the air and seal the bag, which is all done outside the machine. A heat sealer is often used to seal the pack. Typically these units use a dry piston vacuum pump which is often considered a "maintenance-free" pump.
The vacuum bag technique involves the placing and sealing of a flexible bag over a composite lay-up and evacuating all the air from under the bag as schematically shown in Figure 6. Figure 6: Left: Details of vacuum bag lay-up. Right: Vacuum bag sealing and vacuum application results in atmospheric pressure on the repair region (prepreg)
All models used a cloth bag that allowed airflow to pass through and clean the air exiting the machine. Earlier versions of the cloth bag used dense duvetyne, and later corduroy cotton and wool fabric bags where fine grit, dander and other foreign contaminants collected. The cotton bag briefly had an integrated cleaning pocket within, called ...
Torr-Seal, or its generic equivalent Hysol-1C (US brand name) or Loctite 9492 (EU brand name), is an epoxy with resin and hardener for use in vacuum environments. It will begin to degrade at high temperatures but otherwise is very stable with very little outgassing. Other vacuum-rated epoxies are also available.
Vacuum bag may refer to: Vacuum packing of vacuum-sealed bags; Vacuum bag moulding; The dustbag of a Vacuum cleaner This page was last edited on 7 ...
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