With the increasing demand for product performance, material formulas have become more complex. Viscosity continues to rise. Traditional single-axis mixing equipment often struggles to handle materials with high viscosity and solid content. This leads to long mixing cycles, insufficient dispersion fineness, severe wall-hanging of materials, and difficulty eliminating bubbles. These issues directly restrict production efficiency and product quality.

The emergence of the FDT Concentric double-shaft agitator, as efficient dispersing and mixing equipment, integrates the dual functions of low-speed scraping-wall stirring and high-speed dispersing shear, and is specifically designed to address the mixing challenges posed by high-viscosity fluids.

The FDT Concentric double shaft agitator consists of two core components: a scraper mixer and a high-speed disperser. During operation, both agitators run at the same time. This creates an efficient fluid dynamics field. The low-speed scraper mixer handles the macroscopic mixing. It rotates close to the inner wall, pushing material from the wall and bottom toward the center. This prevents blind spots caused by still material. At the same time, the high-speed disperser at the center operates at extremely high linear speeds. It generates strong shear forces that can quickly break apart material aggregates. This action refines the particles and fuses the base material with filler quickly.

Under the combined action of strong shear and mixing forces, the material undergoes intense cyclic motion inside the kettle. This rapid movement accelerates physical mixing. It also promotes the uniformity of chemical reactions. The result is a highly consistent microstructure in the final product.

No blind spot mixing

The most headache-inducing problem when dealing with high viscosity adhesives is undoubtedly “wall sticking”. High viscosity resins or polymers often adhere tightly to the inner wall of the reaction vessel like glue, which not only causes waste of raw materials, but also leads to quality differences between batches, and even causes material deterioration due to local overheating.

The FDT Concentric double shaft agitator completely solves this pain point. The scraper mixer is equipped with high-quality PTFE scrapers. Teflon material not only has excellent wear resistance and chemical corrosion resistance, but also has extremely low surface energy, making it difficult for the material to adhere to its surface. These scrapers are precisely designed to closely adhere to the inner wall of the container. As the mixing shaft rotates, its scrapers continuously scrape off the material adhered to the wall and force it into the strong shear zone of the mixing center.

In order to ensure that the scraper can achieve the ultimate effect, FDT equipment has carried out extremely high-standard processing on the inner wall of the container. The inner wall of the container is precision-machined and then mirror-polished. This high-precision surface treatment eliminates small pits and scratches on the metal surface, ensuring that the scraper can scrape off all materials stuck to the wall, achieving true residue-free. This golden combination of “scraper+mirror” greatly improves the mixing efficiency and greatly shortens the mixing time of high viscosity materials.

Heavy-duty structural design

Adhesive production often involves formulas with high solid content, high material density, and extremely high stirring resistance. This requires the equipment to have a heavy and sturdy structure. The FDT Concentric double shaft agitator adopts a large-area bed board design, providing extremely high stability.

In addition, the convenience of equipment maintenance is also a major highlight. The mixer and spindle are fixed by high-strength bolts, which ensure the rigidity of the transmission and are easy to disassemble. When it is necessary to change the product variety or perform regular cleaning, operators can quickly disassemble the relevant components, greatly reducing the time cost of downtime maintenance.

Flexible process configuration

Different adhesive formulations have vastly different requirements for mixing processes. The FDT Concentric double shaft agitator exhibits strong adaptability and can be flexibly configured according to the viscosity, density, and product formula of the material.

In terms of mixer selection, users can choose frame or semi-frame mixers based on the fluidity of the material. The frame mixer is suitable for materials with extremely high viscosity and can provide stronger turning ability; the semi-frame style achieves a balance between flipping and cutting. In terms of the selection of dispersed disks, the device supports configurations of dual disks, single disks, or Neumann disks.

FDT also offers multiple driving and control options for different production environments. Users can choose a fixed speed drive to reduce costs, or choose a variable frequency drive to achieve a continuously variable speed and precise control of shear rate. For adhesive products that are extremely sensitive to bubbles, the equipment can provide vacuum dispersion or mixing functions as required. Stirring under vacuum can effectively extract volatile components and bubbles from the material, prevent the formation of pores in the cured adhesive layer, and significantly improve the density and mechanical strength of the product. The design of hydraulic lifting and swinging mechanisms makes the operation of single or multiple tanks easy and effortless, achieving the optimization of ergonomics.

deep application

Epoxy resin adhesive is known as the “versatile adhesive”, which uses epoxy resin as the matrix and a curing agent to form a highly cross-linked three-dimensional network structure after curing.

Epoxy resin adhesive has the characteristics of extremely high bonding strength, strong shear resistance, aging resistance, corrosion resistance, and excellent electrical insulation. It is widely used in building structure repair, electronic component packaging, aerospace structural component bonding, and maintenance of hard materials such as metals, ceramics, and glass. However, epoxy resins usually have high viscosity before curing, and in order to reduce costs or impart specific functions, a large amount of fillers (such as quartz powder, calcium carbonate, etc.) are often added.

The uniform dispersion of fillers is crucial in the production process of epoxy resin adhesives. If the dispersion is uneven, it will not only reduce the adhesive strength of the adhesive but also lead to uneven curing shrinkage, affecting dimensional stability. The high-speed dispersion function of the FDT Concentric double shaft agitator can completely open the filler clumps and evenly distribute them in the resin matrix. Meanwhile, unmodified epoxy resin has a brittle texture and weak impact resistance, often requiring the addition of toughening agents or rubber particles for modification. The addition of these modifiers further increases the difficulty of mixing. The scraping and stirring function of FDT ensures that the temperature of the high viscosity modified system is uniform during the mixing process, and avoids the risk of gel caused by local overheating.