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Batch (Loss in Weight)

When to use Loss-in-Weight Batching

Loss-in-Weight batching provides the fastest and most accurate measurement and control of individual ingredients fed into a batch process

Loss-in-weight batching illustratedWhen a process requires that each ingredient be weighed more accurately, or when batch cycle times must be kept to the minimum, or there is a large disparity in the ratio of major ingredient to minor ingredients, Loss-in-Weight (LIW) batch feeding is the optimum solution.

Batch size and accuracy requirements will often determine whether Gain-in-Weight or Loss-in-Weight batching is best to for your process. In general, Gain-in-Weight can be used when the response time and resolution of a platform scale is sufficient to guarantee batch accuracy requirements. But most floor scales do not have sufficient speed and resolution to batch small amounts of products into a large volume container.

Where Gain-in-Weight batches employ volumetric feeders to feed each ingredient sequentially, Loss-in-Weight feeders operating in batch mode feed multiple ingredients simultaneously into a collection hopper.

To achieve an accuracy of +/- 0.1 to 0.5%, Coperion K-Tron’s Loss-in-Weight Batching systems employ a hopper with Coperion K-Tron Loss-in-Weight feeders mounted on high-speed digital load cells that provide 1 part in 4 million resolution.

A Loss-in-Weight batch controller monitors material weight loss from the hopper and controls the start/stop functions of the feeder.

With each feeder possessing its own dedicated weighing system, the LIW batching system delivers each ingredient with greater accuracy and in less time.

Loss-in-weight feeders feed various components to an IBC on a platform scaleUnlike the layering of ingredients that you get with Gain-in-Weight batching, in Loss-in-Weight batching all the ingredients are metered at the same time, eliminating the layering effect and the time and cost for further processing downstream.

Loss-in-Weight batch feeding is the optimum solution when a recipe calls for micro ingredients. These minor ingredients frequently require highly accurate weighing to remain within spec of the recipe, and they are usually expensive, making cost control a high priority.

If additional security or verification of delivered batch weight is required, a dual weighing scenario may be used.

This concept employs a combination of the Loss-in-Weight Batching system feeding into a Gain-in-Weight system.

The Gain-in-Weight system is simply used to confirm the batch delivered by the Loss-in-Weight system prior to acceptance of the batch and further processing.

In the above illustration of a pharmaceutical dispensary application, Loss-in-Weight feeders are shown feeding various components to an IBC on a platform scale.

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