This product is native corn starch powder, which is produced for industrial usage during moist processing of corn.
The addition of starch to the wet end of the paper is generally referred to as beater sizing. Here, the primary function of starch is to increase paper strength, to lay surface fuzz and to increase stiffness and rattle of the paper. Practical experience has shown that adding 1% to 2% starch, on the dry weight of the fiber, is quite sufficient to achieve the desired result. Size press application of starch in the paper industry is often referred to as tub sizing or surface sizing.
The purpose of size press application is to improve appearance and eras ability, inhibit ink penetration and form hard firm surface for writing or printing and to prepare the sheet for subsequent coating. The size press is chiefly used to improve the writing and printing characteristics of sheets such as bond, ledger, tablet, envelope, chart and business grade.
The second important use for surface sizing of paper products is for calendar stack and here its main purpose is to enhance surface characteristics such as scuff resistance and printability. Native starches are generally used at concentrations ranging from 2% to 5%. Cornstarch is used as an adhesive in pigment coating for paper and paperboard. The most commonly used pigments are clay, calcium carbonate and titanium dioxide. The primary purpose of coating is to enhance the printability and appearance of the paper.