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Choosing a Vacuum Press There are three types of vacuum presses for veneering. The information below refers to the systems offered at VeneerSupplies.com. Auto-Cycling Venturi System: The Project: V4 kit creates vacuum using compressed air through a vacuum generator called a venturi. This system does not include an air compressor but you can buy one larger home improvement stores. The vacuum press is automatically controlled by a switching device that measures the vacuum level inside of the system and keeps it reasonably constant by opening the flow of compressed air to the venturi if the vacuum level decreases. The air compressor only runs if the air in the tank drops below level set by the manufacturer. Auto-Cycling Electric Pump System: The Project: EVS-2 kit also cycles on and off but achieves vacuum via an electric pump. Like the venturi system, it is automatically controlled by a switching device which measures vacuum inside of the system and keeps it reasonably constant by turning the pump on until the desired vacuum level is reached. Continuous-Run Electric Pump System: A continuously running vacuum system such as the Excel 1, Excel 3, or Excel 5 uses an electric pump but does not cycle on and off. It run continuously, but don’t worry... most pumps are rated for continuous duty and some manufacturer suggest that these types of pumps can run for two years without stopping. These systems are less expensive and easier to assemble. Other Considerations Performance Maximum Vacuum: Each of these systems can pull more than enough vacuum for veneering and most bent lamination projects. The maximum vacuum is 25.5" of Hg at sea level for all of the systems we offer. This equals roughly 1,800 lbs of pressure per square foot. See this chart for details. Keep in mind that approximately 1" of Hg is lost for every 1,000 feet above sea level. If a pump is capable of pulling 25.5" of Hg at sea level, it will only pull 20.5" Hg at 5000' above sea level. Only 21" Hg is needed for most veneering projects. Cubic Feet per Minute: The most common performance measure is the flow rating at zero vacuum. This coincides with the amount of time it takes to draw full vacuum on a vacuum bag. Bags that have a large amount of air inside (such as those being used with a curved veneer project) will benefit from a high-CFM vacuum source. More information about this is provided in the chart in the next page. VeneerSupplies.com offers vacuum sources from 1 CFM to 9 CFM. Keep in mind that a venturi will typically create full vacuum faster than a comparable electric pump. This is referred to as the “CFM Curve”. It simply means that 3 CFM electric pump will draw vacuum slower than a 3 CFM venturi. 4PDF Image | Composite Curing and Vacuum Bagging Ovens and Controls for Aerospace
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