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Highly automated injection molding material dehumidifying equipment

2024/04/27 By Topstar

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In injection molding, controlling raw material moisture is the key to directly determining the process and high-quality product results. Then, when dehumidifying injection molding materials, highly automated equipment is needed, which can be seamlessly integrated with the injection molding machine, is easy to operate, and has stable performance. This article will reveal the injection molding material dehumidifying equipment used in modern injection molding.

The necessity of dehumidification of injection molding materials

Dehumidifying the material during the injection molding process is a necessary step. The moisture in the material will affect the quality of the final product. Suppose hygroscopic materials are not dehumidified during the high-temperature processing of injection molding. In that case, the moisture acts as a catalyst to decompose the polymer chains, decreasing molecular weight. Adversely affects the mechanical properties of the polymer, resulting in a weaker, more brittle, and less durable product.

In addition, the moisture in the plastic particles can also cause some processing problems during the molding process. When moisture-filled plastic is heated in a syringe barrel, the water becomes steam and creates pressure within the material. This vapor can cause the material to foam, resulting in spatter on the surface of the molded part and voids or bubbles within the part, affecting aesthetics and structure. Insufficient dehumidification, especially for optical products, will affect the transparency and quality of the product.

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Characteristics of highly automated injection molding material dehumidifying systems

Topstar’s highly automated injection molding material dehumidification system usually integrates the three functions of dehumidification, drying, and feeding into one machine. This design takes up no space, is small, and has the entire machine controlled by a microcomputer. Their double-layer insulated drying barrel adopts a down-blowing air duct design, which can prevent heat loss and improve the drying effect. At the same time, it also has the characteristics of intelligent fault alarm and reservation start time. In particular, the dehumidification system adopts a double cooler structure to ensure lower return air temperature and dew point.

Adopt a double cooler structure

In the injection molding material dehumidifying equipment that integrates the three functions of dehumidification, drying, and feeding, the double cooler structure can reduce return air temperature and dew point, which is very important in dehumidification.

The dual cooler system divides the dehumidification process into two different cooling stages. The main cooler first cools the moist air extracted from the hopper, condensing most of the moisture in the air. The partially dried air then passes through a secondary cooler, reducing the air temperature below the initial dew point reached after the first cooling stage. This two-stage cooling process effectively reduces air temperature and dew point.

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Stainless steel mirror polished

For some optical-grade products, there are special optical-grade models. All their raw material contact surfaces are stainless steel mirror polished and equipped with a closed loop feeding system to prevent the dried raw materials from regaining moisture due to contact with outside air.

The mirror-polished finish of this stainless steel is important to prevent contamination from plastic particles during the dehumidification process. It also ensures that no additional particulate or ionic contaminants enter the material, and the mirror-polished surface greatly reduces surface roughness, minimizing the areas where moisture and particulate matter can adhere. This smoothness also helps keep the system clean and reduces the build-up of residue, making mirror-polished stainless steel easier to clean than other materials with rough surfaces.

Integrate with existing injection molding operations

This dehumidification equipment for injection molding materials integrates the functions of dehumidification, drying, and feeding and can also be seamlessly integrated with the injection molding machine. This integration is achieved through a centralized control system synchronizing the dehumidification process with the molding operation. The central control system can communicate with dehumidification equipment and injection molding machines through a unified communication language to coordinate the time and quantity of processing materials. This ensures that we optimize material properties before they enter the mold. A PID temperature control system is also used to control the regeneration temperature accurately.

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Keep injection molding materials dry

The highly automated injection molding material dehumidification equipment can obtain low dew point dry air with good stability by integrating dehumidification, drying, and feeding functions. The double cooler structure they adopt can ensure lower return air temperature and dew point. Integrating with injection molding equipment allows you to synchronize dehumidification and molding operations, making operations more convenient.

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