From "Dust Workshop" to Green Production: An Engineer's Eco-Friendly Injection Molding Solution

In traditional injection molding production, the pre-drying process of raw materials has long been a major source of dust pollution in workshops. When processing certain hygroscopic plastics, it is necessary to dry the raw materials at high temperatures. This process typically uses an independent dryer, where under the action of high-temperature airflow, the moisture in the raw materials is evaporated. However, at the same time, fine plastic particles—especially lightweight and fibrous materials—also disperse, forming visible or invisible suspended particulate matter that pervades the workshop air.

For operators working under such conditions, long-term exposure to plastic dust environments can easily cause respiratory irritation and allergic reactions. In addition, widespread dust reduces visibility in the workshop and causes severe dust accumulation on equipment surfaces, which not only affects the lifespan and stability of the equipment but also increases the difficulty and frequency of cleaning and maintenance, indirectly driving up production costs.

To address this common industry challenge, the engineering team at Zhoushan Hongtuo Machinery Co., Ltd. carried out systematic technological research and development. They observed that by organically integrating the drying process with the injection molding technology and achieving a closed-loop material handling process, it would be possible to curb dust generation from the source. After dedicated R&D efforts, the team successfully developed a dehumidifying injection molding system with an internal circulation feature, possessing independent intellectual property rights. The core innovation lies in the specially designed screw structure.

The working principle of this no-drying internal circulation dehumidifying injection molding machine is as follows: the material does not undergo separate pre-drying but is directly added to the injection molding machine hopper. Using the built-in dehumidifying circulation unit, during the screw plasticizing process, the moisture and humidity in the material are volatilized through the barrel vent. The entire dehydration process is completed in a closed environment, forming a closed loop among material conveying, drying treatment, and injection molding. This eliminates the possibility of dust escape. This not only removes the source of dust but also avoids thermal oxidation or degradation of the raw material that may occur during traditional drying, thereby helping to maintain the stability of material properties.

Thanks to this technological innovation, the working environment of injection molding workshops using this equipment has been fundamentally improved. Workers no longer need to be exposed to dust pollution for extended periods, significantly enhancing their occupational health protection. The cleanliness of the workshop has also been greatly improved, making it easier to meet environmental protection and safety production requirements.

In addition, this technological innovation also brings significant energy-saving benefits. By eliminating the long-duration high-power operation of the dryer, electricity consumption is greatly reduced. According to actual production case calculations, compared to traditional injection molding production lines, using this equipment can save approximately 20,000 to 30,000 RMB in electricity costs per unit annually. Against the backdrop of rising energy costs, this economic advantage is particularly prominent.