A client company wishes to add a processing line to produce 150mL shelf-stable flavoured milks. The milk will be exported and the composition will be of the following mass composition.

The available flow streams for standardising are whole milk, skim milk, and dehydrated lactose monohydrate (in powdered form which will need to be reconstituted into water).

The whole milk is being sourced in liquid form chilled to 0C from Australia and will require standardisation to produce a year-round uniform product. Skim milk is also available at 4C which has already been reconstituted by a local Singaporean company from imported Australian skim milk powder. Compositions of the individual streams may vary from day to day and will be confirmed daily by the laboratory which you have engaged for the purpose. Your task is to design the production system. There will be three variants of flavour, chocolate, banana and strawberry. It is expected that there will be equal numbers of units per flavour. You are to design the plant to produce 450,000 units per day.

How do I design a process flow diagram using the information above? What are the steps and unit operations involved?