Patent ID: 6178659
Filing Date: 2001-01-30
Classification: C14B,F26B

Abstract:
Vacuum apparatus for multiple-bed industrial hide driers, wherein each bed has a heating surface on which the hides to be dried are placed and a cover that provides a hermetic seal, said apparatus comprising a circuit with an open end, along which the following components are arranged in series:at least one vapor manifold associated with each bed to collect the vapors released by the hides;a first condenser inserted in each manifold;at least one main vacuum pump;wherein said main vacuum pump is suitable to gradually reduce an absolute pressure in the circuit to a first value corresponding to a first vapor equilibrium temperature, a first and a second condensate separator are arranged at an output of said condenser, a secondary aspiration device is arranged upstream of the main vacuum pump and downstream of said first and second condensate separator for dry air operation, wherein said secondary aspiration device is suitable to continuously operate in series to said vacuum pump when said first value of the absolute pressure is reached so as to further reduce the pressure of the circuit to a second, lower, value with a result of at least one of (a) instantly increasing evaporation and (b) reducing the vapor equilibrium temperature to a value which is lower than said first vapor equilibrium temperature.