摘要:
In order to stabilize pre-packaged food products and simultanously sanitize the packages, the packages are treated with microwaves in a first processing zone in an atmosphere where hot air is maintained at a superatmospheric pressure. The hot hair is thermostat-regulated at a temperature slightly above that which has been set for stabilizing the food products. The packages are then transferred to a second processing zone maintained at the temperature and pressure of the first zone but free of microwaves. The packages are then transferred to a cooling zone for cooling at a predetermined cooling temperature at superatmospheric pressure. The hot and cold air in the heating and cooling zones are kept in constant motion.
摘要:
An induction sealing device which may be used for producing packages of pourable food products by transversely sealing a tube of sheet packaging material having at least one layer of induction heatable material covered with plastic material. The sealing device has: a generator for generating an alternating power signal; an inductor receiving the alternating power signal to induce a parasitic electric current in the layer and locally melt the plastic material to form a transverse seal; and a matching circuit for achieving optimum power transfer between the generator and the inductor. The matching circuit includes an inductive-capacitive circuit, in which the capacitance of a variable capacitance capacitive element is adjustable so that the current-voltage phase angle is close to zero.
摘要:
A device for controlling a twist of a tube of packaging material in relation to an apparatus for transverse sealing of the tube comprises a number of rollers forming an aperture through which the packaging material is arranged to pass. A roller surface of each of the rollers is arranged to be in contact with an outer surface of the tube. The direction of the rotation axis of at least one of the rollers is adjustable to control the twist of the tube. A method for controlling a twist of a tube of packaging material comprises allowing the packaging material to pass through an aperture formed by a number of rollers with a rolling surface in contact with an outer surface of the tube, and adjusting the direction of the rotation axis of at least one of the rollers to control the twist of the tube.
摘要:
An induction sealing device which may be used for producing packages of pourable food products by transversely sealing a tube of sheet packaging material having at least one layer of induction heatable material covered with plastic material. The sealing device has: a generator for generating an alternating power signal; an inductor receiving the alternating power signal to induce a parasitic electric current in the layer and locally melt the plastic material to form a transverse seal; and a matching circuit for achieving optimum power transfer between the generator and the inductor. The matching circuit includes an inductive-capacitive circuit, in which the capacitance of a variable capacitance capacitive element is adjustable so that the current-voltage phase angle is close to zero.
摘要:
A machine for cutting grass and the like of the type comprising a frame (1a) to which are made integral an operating engine (2), a driving seat (3), means (4) for steering the machine and a front grass-cutting plate (60), characterized in that such grass-cutting plate (60) comprises at least one or more pairs of cutting blades (61) made to rotate via means (2a, 63, 66, 67, 61a) of transmission of the drive from engine (2) and a guard (62) for protecting such cutting blades, which is extended toward the middle part of the machine by a duct (63) capable of engaging a cut-grass collecting container (9) located centrally with respect to the axes of rotation of front wheels (7) and rear wheel (8) of the machine and located in the lower position grazing the ground as shown in FIG. 3 , the action of pushing the cut grass toward such container being exerted by the pressure generated by the rotation of cutting blades (61 ).
摘要:
A device for controlling a twist of a tube of packaging material in relation to an apparatus for transverse sealing of the tube comprises a number of rollers forming an aperture through which the packaging material is arranged to pass. A roller surface of each of the rollers is arranged to be in contact with an outer surface of the tube. The direction of the rotation axis of at least one of the rollers is adjustable to control the twist of the tube. A method for controlling a twist of a tube of packaging material comprises allowing the packaging material to pass through an aperture formed by a number of rollers with a rolling surface in contact with an outer surface of the tube, and adjusting the direction of the rotation axis of at least one of the rollers to control the twist of the tube.
摘要:
A packaging machine for producing sealed packages from a web of packaging material having a surface of uneven thickness comprises a pressure roller to press the surface against a corresponding forming roller for sealing the package. The pressure roller comprises an elastically deformable body; and a core of greater rigidity housed therein, with the core comprising a first end surface cooperating with the body, and a radially inner second end surface. The core includes a first portion and a second portion, with the radial distance between the first and second surface at the first portion being greater than at the second portion.
摘要:
A packaging machine for producing sealed packages from a web of packaging material having a surface of uneven thickness comprises a pressure roller to press the surface against a corresponding forming roller for sealing the package. The pressure roller comprises an elastically deformable body; and a core of greater rigidity housed therein, with the core comprising a first end surface cooperating with the body, and a radially inner second end surface. The core includes a first portion and a second portion, with the radial distance between the first and second surface at the first portion being greater than at the second portion.
摘要:
A machine for thermally treating and sterilizing pre-packaged food articles using microwaves, which is of a type comprising a treatment tunnel having inlet and outlet ports, a conveyor laid longitudinally of the tunnel interior between the ports to convey food article packages laid into parallel rows, at least one microwave generator having microwave radiators arranged to face the rows of packages, further comprises at least one microwave resonance chamber associated with at least one radiator as an extension thereof and extending at one of the rows, through a chamber wall facing the conveyor there being formed a plurality of slots. The machines enables selective heating of the rows of pre-packaged food articles to make the temperature inside the treatment tunnel uniform.