Class Code: 4703
Per NCCI's Scopes Code Description:
Shelled corn is conveyed from storage bins to steeping tanks where sulphuric acid is introduced and allowed to soak. The water is withdrawn and the corn conveyed to degerminating rooms where the kernel is macerated to separate the germ from the hull. The germ is pressed to extract the oil, which is filtered, refined and filled into cans for cooking oil. The remaining hulls and other particles are milled and washed through a series of reels and shakers where the hulls and fiber are separated from the liquid. The liquid is pumped into starch tables where the starch settles to the bottom while gluten passes over the top and is pumped off. The starch sediment is washed and filtered to produce the starch product. Some are processed into various type starches for market by drying, bleaching, sifting and packaging. Another portion of the starch is converted into dextrine by the addition of chemicals, heating, cooling and packaging. Other conversions include refining of starch by cooking, filtering and evaporating into syrup or further crystallized into crude sugars. The residue of the steep water, hulls and fibers, and gluten are dried and ground into stock feeds.
Dextrine is manufactured from starches by use of acids, such as hydrochloric, nitric, acetic and sulphuric. The starches are sprayed or moistened with the acids, dried at 50 degrees centigrade and passed into a heater where they are heated from 14 degrees centigrade to 170 degrees centigrade. After it is thoroughly roasted, it is quickly cooled to prevent conversion, powdered in mills and sieved on bolting cloth.
This process is used in manufacturing all grades of dextrine. The exact type or grade depends upon the type of starches and acids used or the blending of different grades of dextrine.
Another process involves the heating of different starches from 200 degrees centigrade to 250 degrees centigrade in a revolving iron cylinder over a free flame, an oil bath or by a steam jacket. The greater heat to which the starches are exposed performs a function similar to acids.
After the grain or potatoes are thoroughly ground, the pulp is filtered through a screen into a large vat where it is allowed to settle. The waste and impurities are drained off the top. The residue is agitated and allowed to settle and the impurities drained off the top again. This happens a number of times before it is finally passed through a simple drying process. As it comes out of the dryer it falls into a hopper, from the bottom of which the starch is packed.