a) active principleWhen the mold closes, vacuum pump are open to putting the entire amountthe air out of the mold, giving the volume inside the completeis the vacuum; so, when the plastic is sprayed on will not be hamperedby the amount outstanding.b) start time open vacuum pumpTo know the time of the start of air out of the mold, please proceedmold closing action and put a vacuum gauge at the bottom of the mouth sprayplastic. Then, start to open the vacuum pump and determine the time to-the entire mold in the air out. From this information, help fordetermines the time of opening vacuum for reasonable
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