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Vibra Screw Inc
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Vibra Screw - Batch Weighing Systems for Precise Material Processing

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Vibra Screw specializes in designing batch weighing systems that emphasize high accuracy and precision in material processing. These systems differ from continuous Loss-In-Weight (LIW) systems as they do not require continuous feed of materials. Instead, they are engineered to achieve precise final batch weights. The company's range includes controlled vibration feeders and material flow aids, enabling accurate loss-in-weight and gain-in-weight batching across various capacities. The design selection for specific materials builds upon Vibra Screw's extensive historical database, complemented by experimental testing. Batch systems employ volumetric rate control methods, contrary to gravimetric controls seen in LIW systems. These systems can adapt to varying batch sizes and blend different materials accurately, with options for single or dual speed operation to handle bulk and dribble feed requirements. This versatility makes Vibra Screw's batch systems suitable for processes demanding precision in weighing ingredients and supports applications like food mix preparation with gain-in-weight control.
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A Batch Weighing system is similar in design to a continuous Loss-In-Weight system.  Batch applications do not, however, require the material to be continuously fed with a high feed accuracy.  Batch systems are designed to maximize the precision of the final batch weight.  

Controlled discharge from storage and non-pulsating feeding of materials are critical for a successful batching system.  Vibra Screw’s wide range of controlled vibration feeders and material flow aid devices permit superior accuracy in both loss-in-weight and gain-in-weight batching over a wide range of capacities.

The selection of mechanical designs for a particular material is based on our historical database and when necessary, by actual testing in our laboratories.

Batching is a form of non-continuous gravimetric closed loop control in various types of processes requiring blending of weighed ingredients. The batch system is configured very similar to the continuous LIWC system having two main configurations. The Gain-In-Weight (GIWB) and Loss-In-Weight (LIWB) batch systems. Consist of a feed devise (screw feeder, vibratory feeder or rotary feeder), Scale system, and refill system. As with the LIWC system, the batch system may be comprised of many of the feed and storage/discharge devices offered in the Vibra Screw product line.

In contrast to the continuous LIW system, the batch system uses discrete volumetric rate control instead of gravimetric rate control. The control system in a single speed batch uses a speed potentiometer to set the volumetric feeder discharge rate. This rate will not change for the entire batch. 

In a two speed batch, two discrete speed settings are used during the batch. The different speeds function to first bulk feed the majority of the batch requirement and ten finish by dribbling the remaining part. The bulk speed is normally twice that of the dribble speed. The batch controller determines when the system changes from bulk to dribble speed. The weighing and refill system works the same as the LIWC system.