process
2019-05-14 17:15
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Continuous heating and pulse sealing Pulse sealing process is a good substitute for the widely used classical continuous heating sealing tool, which provides very effective solutions and multiple benefits in complex thermal sealing applications. |
Other advantages
Compared with continuous heating, pulse sealing has several other advantages:
Reduce power consumption
Electrical energy is required only during the heating phase of the sealing cycle. During the cooling phase, no current is fed to the heat seal. Whether any heat is actually needed or not, the sealing tool that is continuously heated is heated.
No heating or cooling time
Compared with the alternative of continuous heating, when the machine is started or stopped, the pulse controlled sealing tool only has negligible heating and cooling time. The tool for continuous heating consists of solid metal parts, which must be heated before the machine is ready for use. If the sealing tool is to be maintained, it must be cooled first. A few minutes delay is not uncommon. The heat sealing belt heats up and cools down within hundreds of milliseconds, or in the worst case, for a few seconds.
Pulse sealing - perfect control of sealing process!
Through the classical time control, the current can be delivered to the heat sealing belt within a settable time. During this period, the band continued to heat up; At the end of the heating cycle, turn off the heating and cool the heat seal again by releasing the heat into the environment. This method of only remotely controlling the heating element is similar to the pulse sealing with heat sealing tape, and the sealing process is extremely difficult to control because there is absolutely no way to control the sealing temperature. Although it is theoretically possible to cool the joint under pressure, the sealing temperature cannot be controlled, so it can change from one heating pulse to the next. Even if constant heating power is provided within a constant sealing time, the final temperature will vary according to the initial temperature of the heat sealing belt. This is especially true if the packaging machine is not running continuously or regularly. To avoid this situation, not only the sealing time but also the sealing temperature should be controlled. Only in this way can a real pulse sealing process be described, because in this case, an ideal square wave pulse can be generated, which is more or less significant, depending on the heating and cooling rate of the heat sealing belt, and the temperature curve can be generated to change with time. This rectangular shape ensures repeatable sealing quality and high machine output within a given sealing cycle time, as well as the optimal ratio of sealing time to cooling time. With the RESISTRON temperature controller for heat sealing tape and our CIRUS UPT pulse sealing system, ROPEX provides a perfect solution.
RESISTRON or CIRUS? Two alternative plastic film pulse sealing processes
Each of these technologies is an excellent alternative to sealing thermoplastics using the pulse method. The effective interaction between the RESISTRON temperature controller and the heat sealing belt and the fact that all components in the control circuit are individually designated by ROPEX ensure the optimal ratio of sealing time to cooling time at a given sealing temperature. Because the special design of our CIRUS tool is combined with the UPT temperature controller, the UPT temperature controller can well adapt to this technology, so the heating pulse generated is almost ideal. In particular, CIRUS technology has achieved very fast heating and cooling rates, resulting in extremely short processing time for plastic film thermal bonding. You can find more detailed descriptions of RESISTRON and CIRUS technologies on the RESISTRON and CIRUS pages of our website.
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