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Vacuum pump

The steam in the product passes through the condenser, and the part is condensed into water, and the other part of the steam is pumped out by the vacuum pump to further cool the product. After the product is cooled by vacuum, the surface is very smooth. Vacuum cooling time, in the entire molding cycle accounted for a large proportion of the general accounted for 1/3. Vacuum pump is an important part of the vacuum system, although the traditional automatic molding machine has a vacuum system, but the cold water and vacuum condensate is not separated, and advanced equipment is used high temperature water (55 ℃) cold mold, low temperature water (25 ℃ ) Cool the vacuum pump. EPS molding temperature is about 115 ℃, cooling, the mold surface spray 55 ℃ cooling water 2 ~ 3s, so that the mold surface temperature dropped to about 90 ℃, and then start the vacuum pump began to vacuum. Due to lower pressure, the boiling point of water is also reduced, so the water products within the EPS product began to vaporize and be extracted from the body, and water vaporization is an endothermic process, which makes the cooling process is very rapid, to avoid the product outside the cold heat , And because of this method, the moisture content of the product is very low, generally only 60% to 8%.

Vacuum machine, but also divided into two separate vacuum and central vacuum two types of vacuum is a separate vacuum machine each with a vacuum pump; centralized vacuum, also known as the central vacuum, the machine itself without a vacuum pump, the vacuum machine provided by the vacuum station, the use of central vacuum , The molding machine to improve the efficiency of production, energy consumption is reduced, the central vacuum is the development direction of the current automatic machine.

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