Defining Coating and Mixing Drums

Large Scale Stainless Steel Tumbling Drum

Highlights & Features

In the realm of food processing, it’s crucial to discern the nuances between coating/enrobing and tumbling drums. While they are very similar in many regards, they do have distinct differences that separate them. Let’s delve into the unique features of coating and mixing drums and their respective roles in improving product quality and efficiency.

Here’s a quick overview highlighting what distinguishes our drums from the rest:

  • Custom diversity of sizes: From big to small, we make them all to fit your application needs
  • Sanitary, easy-to-clean, formed flights with no dead zones
  • Stainless or carbon construction; formed or built-in flights
  • Liquid and dry additive feeders to meet your coating requirements
  • Tailor your machine to your specific needs
  • Proven equipment durability spanning decades 
Showcasing differentiating features of MPD's Coating and Mixing Drums

Coating / Enrobing Drums: Uniformed and Targeted Coatings

Coating drums play an essential role in attaining uniform and high-quality coatings across a diverse range of products. Their effectiveness lies in their tumbling action and customizable design, enabling producers to optimize performance for specific project objectives.

Typically, these drums feature a large, rotating design set at a slight decline to assist material movement through the unit using gravity. A specifically designed spray system feeds liquid coatings evenly over the material bed via a strategically positioned spray manifold inside the drum. Dry additives are introduced through a specially designed feeder, utilizing a pigtail auger within a tube with holes or slots for even distribution onto the product.

Coating Drums with Custom Dry Additive Feeders. Applications shown are Pet food, cereal and tablets.

As the drum rotates, the tumbling motion ensures uniform distribution of coatings throughout the product. As a result, this uniform tumbling action, along with granule-to-granule transfer, ensures consistent coating across the entire material bed.

A key advantage of coating drums is their ability to control product dwell time and exposure. By adjusting the drum angle, dwell time can be varied, resulting in increased bed depth and precise coating application. The lifting and turning of the product throughout the drum length guarantee each piece is repeatedly surfaced for uniform coating. The size and shape of the lifting flights can be customized to be aggressive or gentle, while drum speed can be adjusted for varying application needs.

In essence, coating drums provide producers with a dependable and effective solution for achieving superior coatings, ultimately resulting in enhanced product quality and customer satisfaction.

Tumbling Drums: Versatility Redefined

Tumbling drums serve various industries by gently mixing, deagglomerating, conditioning, screening, or polishing products. They feature a large, rotating cylinder or drum, often set at a slight decline to aid material movement via gravity.

Stainless Steel tumbling drum with examples of applications including nuts and seeds, seasoning mixes, and dry chemicals.

These drums excel in blending dry ingredients like seasoning mixes, trail mixes, and dry chemicals without damaging delicate materials. Therefore, this gentle action ensures a uniform blend.

Tumbling drums also achieve consistent mixing or coating, even with fragile materials, by exposing each particle to coatings or mixing ingredients, resulting in a homogeneous product.

Customizable drums include a screening section to remove fines or lumps during tumbling, benefiting deagglomerating applications. Various screen sizes suit specific processing needs, offering flexibility for material sizes and quantities in both small and large-scale production operations.

Related Applications & Industries

Our coating and mixing drums cover a wide array of applications; some of these applications are illustrated below.

Choosing The Right Machine for the Job

Will It Be a Coating or Mixing Drum?

Selecting the appropriate drum for an application involves considering various factors. These factors include the material being processed, desired coating, mixing, or conditioning requirements, product durability, production volume, and space constraints.

The size and capacity of the drum should also align with the facility’s production needs. Specifically, larger drums suit high-volume production or applications requiring longer residence times. Whereas smaller drums are practical for research and development purposes or smaller-scale operations.

Additionally, when deciding on a drum, it’s crucial to assess customization options. Each application may have unique demands, and customizing the drum design ensures optimal performance and efficiency. This is where MPD’s expertise shines! With our extensive range of customizable drum solutions, as well as the number of years of engineer experience, we can tailor the equipment to meet specific application needs.

Showcasing carbon steel coating drum, stainless steel coating drum, and an example of stainless steel formed in flights.

Our team collaborates closely with customers to develop custom solutions that enhance productivity and product quality. Drawing from our experience across various industries, we offer valuable insights and recommendations to ensure the chosen drum meets all requirements.

In summary, by carefully considering their application needs and leveraging MPD’s expertise in drum design and customization, individuals can confidently select the most suitable drum for their processing requirements. Our customizable drum solutions offer unparalleled versatility and performance, ensuring optimal results for every application and instance.


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