If you are looking for a good vacuum bagging machine, you need a few things. These items include a Breather, Bleeder, Mold, and Pump. This article will go over each item in more detail. You may want to get several of them if you plan to use the bagging machine for various purposes. You can also get a combination of these items to save money. Here are the vacuum bagging basics:
A breather is a unique fabric that removes air from under the bag. It also absorbs resin bled from the perforated release film. Breathers come in four and ten-ounce thicknesses. Breathers with non-perforated release films do not need bleeder fabrics. However, thick, bleeder fabrics are like carpets. They assist in the padding of the autoclave or wet-laying up of comprehensive parts.
A breather is made of lightweight polyester. Breathers often stick to pre-preg. However, they can be airtight using process materials that disperse the vacuum pressure. Infusion flow-mesh is an excellent example of process material. It is cut to fit or layered on the mold flange. You can also use a vacuum puck or a perforated film.
To use a bleeder, you’ll need to ensure it’s from the appropriate material. Plastic tubing must be heat resistant. A plastic bag can withstand vacuuming at room temperature but may collapse when heated. For best results, choose a flexible material. Make sure to purchase a bleeder that comes with a limited warranty. In any case, make sure to consult with your manufacturer to get the correct model.
A breather is a thin synthetic fiber material that is draped over a laminate and right underneath the bagging film. It serves two primary purposes: to help distribute vacuum pressure evenly across the laminate and allow gases released during the cure to escape.
You should know of a few special considerations when molding for vacuum bagging. For example, it is essential to select the mold release agent carefully. Depending on the kind of mold, it may be a widespread contaminant such as wax, grease, or toilet bowl wax. Other potential mold release agents include hair spray, clear packaging tape, or toothpaste. These substances are commonly available and cheap, but vacuum bagging has some nuances.
A bleeder/breather material is essential to the vacuum bagging process because it absorbs the excess resin in the laminate. Breather cloth is also vital to the bagging process since it can help apply pressure in difficult-to-reach corners and ensure even vacuum distribution within the bag. Ideally, the release material should overlap at all joints to prevent bridging and other problems associated with a vacuum bag.
Considering buying a pump for vacuum bagging? There are several factors to consider when choosing a vacuum bagging pump. First, make sure the pump can handle the type of vacuum bagging material you plan to use. Vacuum bagging requires a solid suction to achieve the desired results. The suction power will determine the overall vacuum level and determine how efficiently the bag can be emptied.
A typical vacuum bagging pump works with a diaphragm to create negative pressure. It can be suited to small and medium-size vacuum bagging applications. Features include a 1/2-cfm suction capacity, an on/off switch, and a cord to plug the vacuum bagging pump. Another benefit is its portability and lightweight construction. It weighs 6.5 pounds and operates with a 1/16-horsepower oil-less motor.
Vacuum bag sealing adhesive Tape is a multi-purpose material that combines excellent sealing and easy removal. It can withstand high temperatures and is highly adhesive, making it ideal for various applications. Its tack is extra high, making it less likely to shift under vacuum. Its adhesive properties are excellent in vacuum bagging applications up to 400degF, and it is easy to remove from cold surfaces. This Tape is available in various colors, including yellow, red, and black.
Yellow Sealant Tape is available by the roll (#580-A) and by the case of 40 rolls (#580-B). If you buy nine or more Tape cases, you’ll receive a quantity discount. Tacky Tape is particularly effective when sealing composite bags because it is resistant to mold, a common problem during debagging. The yellow Tape is also highly flexible, making it useful for various production methods.