When designing a process layout, we ought to consider the smoothness of each processing steps. The flow should be in one direction, no turning back, from raw material to delivering of final products.
There are a few flow shapes for us to consider. Either, "I", "L", "U" or "S" shape. As you see, every shape show one way of process flow. This is important as to avoid cross-contamination of the in-process products in between steps.
Besides, it is also essential to isolate dirty process steps from clean process steps. If the flows are crossing, there is hazards to contaminate products, either by food handlers, in-process products, the tools and so on.
The human flow should be designed so that all workers should change processing uniform in changing room, follow by do hand washing at washing station before entering processing area to process. Toilet should be constructed which is not facing processing area.
Above are an example of a layout plan. There is no standard way of designing processing flow, as long as the flow are clear and in one direction.
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