Hot Air and Continuous Band Sealers
TOSS HLS & new RO-JET® Hot Air Sealers
With hot air sealers, contact-free and continuous sealing of thermoplastic films can be achieved. This procedure is particularly suitable for mono films like polyethylene but can be applied to any other films (such as laminated films). In contrast to sealing by heating bands, the width of sealing seams can be affected only slightly and is narrow (approx. 2 mm) due to material characteristics, but without restricting the tensile strength of the seam.
For the operation process, a constant speed of the film is required to create even processing conditions in the seam area. This aspect must be paid special attention during intermittent operation.
The heart of the TOSS hot-air sealing unit is the air heater. A tubular heat conductor is equipped with combined connections at its ends for electric power as well as air supply. Along the heated tube body a number of bores is drilled. Electrical current flowing through the conductor will heat up the tube as well as the air passing through it. A precise temperature control will be obtained by changes in electrical resistance of the conductor (PIREG® temperature controller). This low-inertia and sensor-free kind of control will allow significantly short warm-up times (< 2 s). Use of compressed air has a positive effect on the sealing seams, also the fan and heating coil being customary with conventional solutions become unnecessary. The system is completely resistant to compressed air outages. As a substitute for the longitudinal sealing bar of tubular bag machines, the device has to be located close to the format tube (see illustration).
The heating element support is mounted on a single-acting pneumatic actuator serving as a stopping device, which will, when pressurized during operation process, bring the heating element to film. In case of a machine’s stop the heating and compressed air supply will be deactivated and heating tube will be lifted up in order to reduce the influence of residual heat to film. Travel distance of this pneumatic actuator can be restricted by an adjusting nut accessible from outside.
For short breaks or for intermittent operation an interruption of the compressed air supply will be sufficient.
A short distance between the hot air tube and the film will be resulting in the highest effectiveness, while at the same time a direct contact strictly will have to be avoided, as otherwise plastic deposits on the tube will develop. The operation of hot air sealing units requires dry and filtered compressed air of 4 to 6 bars.
RO-JET 18
The newest generation in hot air sealing units
In TOSS’s proven standard aluminum hot air housing, a totally redeveloped concept of air heating has been developed, allowing a considerably increased power density to be utilized. Higher processing speeds and/or higher film thicknesses can now be utilized.
Advantages of RO-JET compared to hot air sealing units of the TOSS HLS series are as follows:
- A constant temperature profile exists now across all nozzle openings.
- The entire flow field is available for sealing process.
- Laminar air flow conditions.
- Adjustments for performance requirements are practically unlimited due to quantity of nozzles.
- New RO-JET reaches required temperatures in less than 2 seconds.
- A significantly smaller gauge power cable is utilized.
- Longer service-life compared to conventional hot air tubes.
- Up to 240 feet/min heat sealing speed when using 40micron PE-film!
HLS-170
The newest generation in hot air sealing units
In TOSS’s proven standard aluminum hot air housing, a totally redeveloped concept of air heating has been developed, allowing a considerably increased power density to be utilized. Higher processing speeds and/or higher film thicknesses can now be utilized.
Advantages of RO-JET compared to hot air sealing units of the TOSS HLS series are as follows:
- A constant temperature profile exists now across all nozzle openings.
- The entire flow field is available for sealing process.
- Laminar air flow conditions.
- Adjustments for performance requirements are practically unlimited due to quantity of nozzles.
- New RO-JET reaches required temperatures in less than 2 seconds.
- A significantly smaller gauge power cable is utilized.
- Longer service-life compared to conventional hot air tubes.
- Up to 240 feet/min heat sealing speed when using 40micron PE-film!
HLS-220
The newest generation in hot air sealing units
In TOSS’s proven standard aluminum hot air housing, a totally redeveloped concept of air heating has been developed, allowing a considerably increased power density to be utilized. Higher processing speeds and/or higher film thicknesses can now be utilized.
Advantages of RO-JET compared to hot air sealing units of the TOSS HLS series are as follows:
- A constant temperature profile exists now across all nozzle openings.
- The entire flow field is available for sealing process.
- Laminar air flow conditions.
- Adjustments for performance requirements are practically unlimited due to quantity of nozzles.
- New RO-JET reaches required temperatures in less than 2 seconds.
- A significantly smaller gauge power cable is utilized.
- Longer service-life compared to conventional hot air tubes.
- Up to 240 feet/min heat sealing speed when using 40micron PE-film!
TOSS Continuous Band Heat Sealer
The TOSS Continuous Band Sealer is useful as an add on component for a larger machine. It is very easy to set-up and install. In a typical installation the sealer is mounted so that a flat surface is provided opposite the continuous band.
The heat for sealing is provided by a hot bar that is positioned to provide pressure to the band. The hot bar is suspended from a bracket that is mounted on a pneumatic ball slide that presses the band against the plastic film to be sealed. When the forward motion of the plastic web stops moving the ballslide is retracted to remove any further heating from the heatseal band.
In order to create a suitable system, the web of film must be drawn beneath the sealer in synchronization with the speed of the continuous band. This can be accomplished by connecting the drive of the Band Sealer to the drive of the take-up means on the machine using either a mechanical connection such as a chain drive, timing belt ; or a servo motor.
Specifications
Power: 230 VAC, 1200 Watts
Heat seal width: 4-10mm
Film speed: up to 100 Feet/Minute