Fantesk starch-oil composite

The starch component of the Fantesk starch-oil composite can vary in its chemi-cal/structural properties (amylose, amylopectin, waxy) as well as in the type of crop source (corn, potato, rice, etc). Likewise, the oil component of the Fantesk starch-oil composite can have a variety of chemical/structural properties, compositions, and end uses. Over the years, Fantesk starch-oil composites of various combinations of starch and oil have been prepared and investigated for a variety of food and nonfood applications, including cosmetics, pharmaceuticals, polymers, coatings, and lubricants [4, 30-33]. 

In the area of lubrication, Fantesk starch-oil composites have been investigated for applications in oil well drilling [34] and as dry-film metalworking lubricants [35, 36]. Dry-film lubricants are those that are preapplied on sheet metal for various... 

A typical data set from the ball-on-flat tribometer is shown in fig. 13.13. The data show time vs. friction force for a Fantesk starch-oil composite dry-film lubricant comprising soybean oil in purified food-grade starch (PFGS). The data display a number of features typically observed from such measurements. The friction force displays an initial sharp increase to a maximum, which immediately falls to a steady-state value for the remainder of the measurement period. The maximum friction force corresponds to the static friction, i.e., the resistance of the ball to the relative motion from an initial state of rest. The steady-state friction force corresponds to the kinetic friction. The COF for the test was obtained by dividing the average steady-state friction force by the normal load, which is 1500 gf... 

The effect of vegetable oil concentration on the COF of the Fantesk starch-oil composite is illustrated in fig. 13.14, where the concentration of oil in the starch matrix is expressed in parts per hundred (pph), which is the ratio of oil to dry-starch weights multiplied by 100. The data in fig. 13.14 are for a composite of meadowfoam oil in PFGS and display a number of interesting features. First, the composite without vegetable oil (pure steam-jet cooked starch) displays a very high COF, on the order of 0.8. Second, incorporation of even a small quantity of vegetable oil into the composite causes a sharp reduction in the COF. The COF continues to decrease with... 

These observations on the effect of vegetable oil concentration in the Fantesk starch-oil composite on the boundary COF between the starch and steel are similar... 

FIGU RE 13.14 Effect of meadowfoam oil concentration in purified food-grade starch (pfgs) on the coefficient of friction of Fantesk starch-oil composite dry-film lubricant. 

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