Thermo-sealing apparatus for filling and sealing liquid containers
A thermo-sealing machine for filling containers with liquids and sealing them, comprising a bearing structure on which a bell member is mounted, at a higher position than that of support means for supporting at least a container to be filled and sealed, said bell member comprising a metering device, die-cutting means and sealing means, for die-cutting and sealing a film slidable between said bell member and the container to be filled, said machine being provided with an anti-polluting and operator safety system.
1. A thermo-sealing machine for filling containers with a solution of formic aldehyde and sealing them, said machine comprising:
a bearing structure;
a bell member mounted on said bearing structure;
a drawer member for supporting at least a container to be filled and sealed, said drawer member being selectively arrangeable below said bell member, said bell member and said drawer member being movable relative to each other between a metering and sealing position, in which said bell member and said drawer member form a closed environment, and a spaced-apart position in which said bell member is spaced from said drawer member;
a film which is slidable between said bell member and a container supported by said drawer member when said bell member and said drawer member are in said metering and sealing position;
a metering device adapted to meter said solution of formic aldehyde, said metering device comprising an injection nozzle which is arranged inside said closed environment of said metering and sealing position formed by said bell member and said drawer member;
a die-cutting device arranged inside said closed environment of said metering and sealing position formed by said bell member and said drawer member, said die-cutting device being adapted to die-cut said film inside said closed environment of said metering and sealing position;
a sealing device arranged inside said closed environment of said metering and sealing position formed by said bell member and said drawer member, said sealing device being adapted to seal said film inside said closed environment of said metering and sealing position.
2. A machine, according to claim 1 , characterized in that said film is supplied by a film bobbin or coil and is entrained by an electric motor.
3. A machine, according to claim 1 , characterized in that said drawer member comprises a counter-biasing recess adapted to support a said container.
4. A machine, according to claim 3 , characterized in that said machine comprises a lifting device for vertically displacing said drawer member, to displace in turn said container from a sealing and filling position to a lowered position for allowing said film to slide.
5. A machine, according to claim 1 , comprising a plurality of drawer members adapted to support containers of different sizes.
6. A machine, according to claim 1 , characterized in that between said drawer member and a machine cover of said machine, a bellow is arranged, providing tightness between an inner part of the machine and an outer environment, while allowing said drawer member to be cross-wise displaced.
7. A machine, according to claim 1 , characterized in that said metering device is driven by a metering pump and coupled to a supply tube in turn coupled to a liquid tank.
8. A machine, according to claim 1 , characterized in that said die-cutting device comprises a first cylindric die-cutting member and a second cylindric die-cutting member having a larger diameter than that of the first die-cutting member and coaxial therewith; said first die-cutting member being mounted on a first sealing ring element forming, with a second sealing ring element, said sealing device; said second die-cutting member being mounted on said second sealing ring element, said first and second cylindric die-cutting members being arranged outside of the respective sealing ring elements, each die-cutting member-ring element pair being vertically movable in an independent manner from one another, so as to be driven from a raised position to a lowered position where a die-cutting member die-cuts the film and the respective ring element seals said film on a container edge.
9. A machine, according to claim 1 , characterized in that said sealing device is adapted to seal said film by a cold sealing operation.
10. A machine, according to claim 1 , characterized in that said machine further comprises a suction system for sucking possible vapors generated during an injection step of said solution of formic aldehyde.
11. A machine according to claim 1 , further comprising an anti-polluting and operator safety system.