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tqm

Apr 03, 2018

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    Wheat

    Wheat (Triticum aestivum) is the staple food crop of the Pakistani nation, supplying 72% of energy andprotein in the average daily diet. Wheat provides more nourishment than any other food grains. Per capitawheat consumption in Pakistan is around 120kg/year which is highest in the world. Wheat is grown in allprovinces of Pakistan, occupying an area of about 8.5 million hectares.

    Flour Milling

    The development of the roller mill in the 1870s started the growth of the modern flour mill and the consolidation of the flour milling industry.

    Representative Body

    Pakistan Flour Mills Association is a registered and dully recognized representative TradeBody of Flour Milling Industry having 915 flour mills member from all over the Pakistan. This

    Association was primarily constituted in 1949 under the name of Punjab Flour Mills Association .

    During the last 60 years, there has been tremendous increase in the milling capacity inPakistan. Starting with 19 flour mills. Now 915 flour mills (Registered with the Association)working in Pakistan with the daily milling capacity of 77275 M. Tones daily.

    Detail of First Visit

    We visited AL-KAUSAR FLOUR & GENERAL MILLS. It is in located in Plot #46,47,48,Sector I-9 Industrial Area Islamabad.

    The purpose of our visit was to study modern flour mill design and functionality. The final reportwill address planning, life-safety considerations, food compliance regulations, and buildingdesign and construction.

    Flour milling process

    Receiving

    The flour milling process starts with the receiving and storage of whole grain. Grain is receivedin ware house here it is de-sacked and stored in groups of steel or concrete silos laid out verysimilar to grain elevators.

    Cleaning of Grain

    The grain is the moved through the cleaning system which is housed in the cleaning tower. Avariety of cleaning equipment is housed in the multi-story cleaning tower, and cleaning is donewith machinery using air currents, magnets and screens to separate the wheat from stones,sticks, other grains and undesirable elements.

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    Equipment typically consists of separators, de-stoners, magnets, aspirators and other cleaningmachinery. After cleaning, the grain is moved to temporary storage silos (known as cleanstorage) prior to tempering.

    Tempering After cleaning, the grain is moved to temporary storage silos (known as clean storage) prior totempering. Immediately prior to milling the wheat is moved to tempering bins at one end of themilling tower where the clean wheat (or other grain) moisture content is adjusted toapproximately 16%. The milling process is ready to begin

    Milling

    The flour milling process consists of the

    1. Break System,2. Purification Or Sizing System,3. Reduction System, And4. Tailing System.5. Packing

    The mill tower usually consists of 4 to 7 levels with integral bins at each end of the tower. At oneend are the tempering bins, and at the other end are the finished flour bins. Between the binclusters are many levels housing the various systems that complete the milling process.

    The Break System is primarily comprised of roller mills. In this system the wheels in the roller mills run in opposite directions at different speeds and have a saw tooth configuration. Thepurpose of the process is to separate the endosperm form the rest of the kernel. To achievethis, the wheat is run through the roller mills up to five times. As part of this process, sifters arealso used to separate the endosperm from the bran and germ which is typically a co-productknown as wheat feed.

    The Purification System consists of purifiers, roller mills and sifters. Purifiers sort particlesbased on size, air resistance, and specific gravity. The roller mills further reduce the size of theparticles. Almost no flour is produced in this operation and the material is either passed to thereduction system or sent back to the break system. The purpose of the purification process is toseparate the small bran from the endosperm.

    The Reduction System consists of a series of roller mills and sifters in sequence. The roller mills in this sequence are smooth, resulting in a finer grind. At this point it is desirable to havemechanical starch damage to the wheat to improve flour quality. This phase reduces theendosperm to flour. This process is repeated up to 11 times to obtain the fineness required for the flour.

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    The Tailings System is where the unwanted co-products of the flour milling process go. Theproducts are turned into animal or pet food. These co-products are often sent out in bulk.There are fewer tailings (or co-products) for whole grain flour, and more for white flour, becausemore of the kernel is used for whole grain flours.

    In each of these systems the "overs" of each sieve (particles not fine enough to pass through ascreen) are directed to another set of rolls (i.e. back through the process) for further reduction,or to one of the residue streams.

    At the end of the process the various runs of flour are blended and mixed to make the requiredgrades of flour. They are then treated with the addition of malted barley, bleaching agents,enrichments, etc. before packaging or shipment in bulk.

    Packing

    The finished product bins are where the finished flour is stored prior to packaging or bulkshipment. The warehouse is where the packaging takes place. Warehousing consists loadingdocks and palletizing equipment.

    Utilities make the flour mill run, and air is a key system in a flour milling facility. It is used toconvey flour from system to system, and to separate streams into components. Ten times asmuch air is required to move a single volume of flour. The air system consists of fans, blowers,compressors, and pneumatic conveying lines. Other elements of the air system consist of cyclones, dust collectors, and filters.

    A flow chart is being depicted to show movement of raw material through various phases of milling and

    conversion into flour.

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    Few pictures of our visit.

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