Pin Mill Technology for High-Efficiency Classifiers
Not so long ago, the air-swept classifying mills were the newest and most advanced trend in the milling industry. They were designed to perform different non-abrasive milling application during a simple two-phase process.
This, once state of the art, high-efficiency classifier performance was based on a simple selection process. The first stage was assortment as it only used particles that were, according to the predetermined size, as was the finished product in the mill.
Air-swept mills were considered efficient because they provided the best performance according to standardised norms. However, this milling technology was costly and needed substantial investments.
The required components of machinery included baghouse filters that separated milled material from the air stream, and high-static-pressure blowers and auxiliaries, which were increasing cost for each ton of material processed.
Modern technology has brought advancements to this field. Pin mills apply different degrees of impact and agitation to successfully process many materials. Their performances include several functions that allow reduction of bulk solids and deagglomeration materials, breakage of fibres in natural materials, etc.
In addition, pin mills help with processes of product densification, fluffing, mixing, blending, dispersion and homogenization.
High-efficiency classifier pin mill technology provides various speeds. Its design and performance include slow mix and blending action that use 6,800 ft/min rotor speed, as well as grinding that is performed at a high-impacting rate that goes up to 36,000 ft/min. Most recent model designs include airtight seals that allow proper atmosphere control.
They are constructed from many materials that include stainless steel, carbon, and other metals that will not interfere with the chemical procedures performed during product processing.
How do pin mills work?
Pin mills are used in different industries, but generally, have the same purpose which is a homogenization of the product. Their function is to introduce the feed product onto different rotors configured by pins or blocks acting as impact points that allow material processing. The type of processing is determined by the number and orientation of the pins, while the speed dictates the force of impact.
These operations result in a product size reduction after the feed material is distributed through several pins that have repeated interactions at higher speeds. The variations of efficiency and product quality depend on the pin mill design, quality of feed material, rotors as well as the operation manager that is responsible for surveying of the process.
Even in the past, pin mills required less energy for efficient performance, and have been more straightforward for handling. One of their flaws was that their design was not as successful when attempting to reach the same level of particle size, as the air mills were able to.
In recent years developers worked hard on overlapping these technicalities aiming to reduce costs and raise the effectiveness of pin mills and were successful.
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