- Vacuum bag
A vacuum bag is a bag made of strong rubber-coated fabric or
polymerfilm, open at one end, and used to bond or laminatematerials. In some applications the bag encloses the entire material, or in other applications a moldis used to form one face of the laminate with the bag being single sided to seal the outer face of the laminate to the mold. The open end is sealed, and air is drawn out with a vacuum pump. As a result, uniform pressure approaching one atmosphere is applied to the surfaces of the object inside the bag, holding parts together while the adhesive cures. The entire bag may be placed in a temperature-controlled oven, oil bath or water bath and gently heated to accelerate curing.
Laminating of flat objects can be performed more efficiently in a heated laminating press, but when the objects are curved or have irregular shapes, a vacuum bag is normally used.
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