- China Plastic Precision Technology manufacturer
In plastic molding processes, controlling the moisture content of raw materials is one of the key variables affecting the intrinsic quality of products. Engineering plastics such as PA and PC are extremely sensitive to moisture. Even a trace amount of moisture during high-temperature molding can trigger material degradation, surface silver streaks, or even a significant decline in mechanical properties. Dongguan Tongrui Machinery Co., Ltd. has been deeply engaged in the field of auxiliary equipment for plastic molding for many years. Its dehumidifying and drying series products use honeycomb rotor technology as the core, simultaneously improving both the dew point stability of drying air and system energy consumption, providing a reliable and economical drying solution for the processing of hygroscopic engineering plastics.
Honeycomb rotor: a stable source of low-dew-point drying
The core of Tongrui's dehumidifying and drying system lies in the design of the honeycomb dehumidifying rotor. The central thickness of the rotor is only 0.22mm. This thin structure enables the rotor to switch quickly between the moisture absorption and regeneration desorption stages, significantly shortening the regeneration cycle while ensuring a continuous and stable supply of dry air. In actual operation, the system can provide ultra-low dew point dry air with a stable dew point of -40°C and below, which is sufficient to meet the stringent requirements of strongly hygroscopic engineering plastics such as PA and PC for the drying environment.
The improvement of drying efficiency depends not only on the rotor itself, but also on the sealing and insulation design at the system level. Tongrui's dehumidifying and drying equipment adopts a closed-loop pipeline design, effectively isolating the infiltration of external humid air and avoiding the problem of raw materials reabsorbing moisture after drying is completed from the source. The insulated drying hopper is paired with a downward blowing pipe design, combined with a cyclone exhaust device, controlling heat loss at a relatively low level, ensuring uniform and stable temperature inside the hopper, and enabling the raw materials to reach the ideal moisture content level within the set drying cycle. In the regeneration stage, the system adopts a dual cooler structure, further reducing the temperature requirement of the regeneration air and creating conditions for the reduction of overall energy consumption.
The scientific reduction of regeneration temperature and the energy consumption account
The largest energy consumption of a dehumidifying dryer is concentrated in the rotor regeneration stage. The regeneration temperature of traditional hot air drying equipment usually needs to be maintained at around 230°C, while Tongrui's honeycomb dehumidifying system reduces the regeneration temperature to 180°C, a reduction of more than 40%. Behind this temperature reduction is the optimization of the moisture desorption efficiency by the rotor material and structural design—the thin honeycomb structure makes heat transfer more uniform and moisture desorption more thorough, so that regeneration can be completed at a lower temperature, directly reducing heating energy consumption.
Overall, Tongrui's dehumidifying and drying system can save about two-thirds of energy consumption compared with traditional hot air drying methods. For drying processes that require long-term continuous operation, the difference in electricity costs accumulated over the entire life cycle of the equipment is quite considerable. The company can also provide customized configurations according to customers' specific raw material types, production capacity scale, and workshop conditions, ensuring the degree of match between the drying system and the customer's actual production rhythm, and avoiding energy waste and quality risks caused by over-drying or insufficient drying.
From drying to conveying: the collaborative value of integrated supporting equipment
Dehumidifying and drying is not an isolated process. Tongrui Machinery designs its dehumidifying dryers and system conveying and feeding equipment collaboratively, so that the dried low-dew-point air and the processed raw materials remain stable in a closed conveying path. The company's main product lines cover auxiliary supporting machinery for plastic molding such as environmentally friendly industrial chillers, gravimetric blending mixers, masterbatch mixers, mold temperature controllers, dehumidifying dryers, and system conveying and feeding equipment. The matching of process connections has been considered in the design of each device. For processing scenarios with clear requirements for raw material drying quality, such as electronic and automotive parts, medical products, optical discs, plastic pipes and sheets, cables, and packaging, this integrated supporting solution reduces the risk of quality degradation between processes and also lowers the comprehensive cost of multi-equipment selection and debugging for customers.
Tongrui has always adhered to the principle of "quality assurance, customer first," relying on independent innovation and advanced European and American technical experience to continuously promote product iteration in terms of energy saving and stability. As an important part of the company's plastic intelligent control product matrix, the dehumidifying and drying system is providing practical technical support for the quality stability and cost control of plastic processing enterprises with quantifiable low-dew-point performance and significant energy consumption advantages.
