Unlocking Precision in Ziplock Bag Production: Temperature Control Mastery

The ziplock bag-making machine is an engineering feat that harnesses the thermoplastic properties of plastic, utilizing a hot knife to induce a viscous flow state in the sealing area of the plastic film. The fusion of the upper and lower layers of plastic under pressure, followed by cooling, positioning, and cutting, transforms the film into a secure packaging solution. Achieving precise control over hot sealing, cutting, and feeding movements is crucial, with temperature control of the hot knife being pivotal to the quality of heat sealing.

In the quest for excellence, many domestic bag-making machine systems have integrated multi-channel temperature controllers. These controllers can manage the temperature of multiple hot knives simultaneously, display real-time temperature values, and adjust parameters in real-time for optimal control. Despite their prevalence, these systems have limitations, including insufficient channel capacity, low-resolution AD conversion chips, inadequate temperature accuracy, weak communication capabilities, and user interfaces that lack intuitiveness.

Temperature Measurement Principle

Understanding the temperature measurement principle and multi-channel temperature signal acquisition is vital for enhancing these systems. The most common temperature measuring devices for ziplock bag-making machines are thermocouples and thermal resistances. Thermocouples, chosen for their wide measurement range, stable performance, and simple structure, convert temperature differences into potential differences. Despite their non-linear temperature-potential curve, modern processors with ample storage resources can utilize look-up tables to convert these values accurately.

Signal Conditioning Circuit Design

Signal conditioning circuit design is essential for the millivolt signals produced by thermocouples. Filtering, anti-interference measures, and amplification ensure that the signal is accurately captured and sent to the AD converter. The use of resistance-capacitance filters and double diodes safeguards the circuit from large signal impacts.

Signal Amplifier Circuit

The signal amplifier circuit addresses the small signal challenge by amplifying the thermocouple's signal before AD conversion. The selection of an operational amplifier with low-pass characteristics and the design of a differential mode amplifier circuit ensure accuracy. Additionally, choosing an AD conversion chip with an internal gain amplification function can reduce the need for high amplification factors in the front-end circuit.

In conclusion, Bosen's commitment to innovation and precision engineering is evident in our ziplock bag-making machines. We invite you to experience the future of packaging with our advanced technology. Join us in setting new benchmarks for quality and efficiency in the industry.