Piovan S.p.a.

Enrico Bellio

Davide Cappellini

Marco Bevilacqua

Marco Bortolozzo

Andrea Battaglia

Riccardo Ronzone

A method and an apparatus for the dehumidification and/or drying of plastic material in the form of granules and/or micro-granules and/or powder and/or flakes or similar are described, with at least one hopper for dehumidifying/drying the plastic material, a generator of a process fluid that passes through the hopper, at least two molecular sieves towers arranged in parallel and operating alternately to dehumidify the process fluid, and at least one source of a regeneration fluid by heating the molecular sieves. The invention allows to improve the energy efficiency of the regeneration cycle of molecular sieves.

Dehumidification method and apparatus

An analysis method and apparatus are disclosed for analysing an absorption filtering medium that filters volatile organic substances in a process gas in a plant for dehumidifying polymer granules, with a fan that generates a flow of gas through the filtering medium, an analyzer of the total concentration of the organic carbon, a sensor to detect the pressure downstream of the filtering medium, in which the saturation state and/or the absorbent capacity and/or the deterioration over time of the filtering medium is determined by a comparison of the measured concentrations of total organic carbon in the flow of gas upstream and downstream of the filtering medium.

Separator analysis method and apparatus

A purifying device for purifying a process fluid that flows in a dehumidifying plant for dehumidifying plastics includes a first layer configured for filtering the process fluid, and a second layer configured for reducing, by adsorption, substances that are harmful for health, in particular COV/SOV, which are present in the process fluid.

Device for purifying a process fluid and dehumidifying plant including such a device

A method and an apparatus are disclosed for processing plastics, in which the material in incoherent solid state is dehumidified in a hopper and is then melted in an extruder, after which the molten material is used in a moulding device for moulding by injection and/or by blow moulding and/or compression, and in which a set point pressure value of the molten material is set on the basis of a measured residual humidity value of the dehumidified incoherent solid material, so as to decrease the pressure value by a preset variation value if the measured residual humidity value is lower than a reference value and to increase the pressure value by a preset variation value if the measured residual humidity value is higher than said reference value.

Method and apparatus for processing plastics

A method is disclosed of controlling a plant for dehumidifying and/or drying plastic material in granular and/or micro-granular and/or powder and/or flake or similar form, this plant including a process fluid generator and at least one dehumidifying/drying hopper for feeding a respective user machine associated with the plant and including a melting device for melting the plastic material and a moulding device for moulding, in particular by injection moulding and/or blow moulding and/or compression moulding, the plastic material. The method of controlling includes the steps of detecting in the user machine a pressure (P) of the plastic material in melted state and modifying at least one process parameter (D) of the plant on the basis of the detected value of this pressure (P).

Method and system of controlling a plant for dehumidifying and/or drying

Method of controlling and optimising a plant for dehumidifying and/or drying plastic material in granular and/or micro-granular and/or powder and/or flake or similar form, wherein the plant includes a process fluid generator and at least one dehumidifying/drying hopper intended for supplying a respective user machine, in particular a machine for treating and transforming plastic material, including a melting device for melting the plastic material and a moulding device for moulding, in particular by injection moulding and/or blow moulding and/or compression moulding, the plastic material. The method includes the steps of detecting a process parameter of the plastic material and adjusting at least one further process parameter of the plant on the basis of the detected value of the process parameter. The detected process parameter is the intrinsic viscosity of the plastic material in melted state.

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Ponzano V.to, Italy

Enrico Bellio