Editing Starch (section)

===Adhesives===
[[Corrugated board]] adhesives are the next largest application of non-food starches globally. Starch [[glue]]s are mostly based on unmodified native starches, plus some additive such as [[borax]] and [[caustic soda]]. Part of the starch is gelatinized to carry the slurry of uncooked starches and prevent sedimentation. This opaque glue is called a SteinHall adhesive. The glue is applied on tips of the fluting. The fluted paper is pressed to paper called liner. This is then dried under high heat, which causes the rest of the uncooked starch in glue to swell/gelatinize. This gelatinizing makes the glue a fast and strong adhesive for corrugated board production.

Starch is used in the manufacture of various '''adhesives''' or glues<ref>{{cite web |url=http://www.ars.usda.gov/is/ar/archive/apr00/wood0400.htm |title=Stuck on Starch: A new wood adhesive |publisher=US Department of Agriculture |date=2000 |access-date=2011-01-14 |archive-date=2010-04-13 |archive-url=https://web.archive.org/web/20100413134900/http://ars.usda.gov/is/AR/archive/apr00/wood0400.htm |url-status=live }}</ref> for book-binding, [[wallpaper adhesive]]s, [[Paper bag#Multiwall paper sacks|paper sack]] production, tube winding, [[Gum tape|gummed paper]], envelope adhesives, school glues and bottle labeling. Starch derivatives, such as yellow dextrins, can be modified by addition of some chemicals to form a hard glue for paper work; some of those forms use borax or [[soda ash]], which are mixed with the starch solution at {{convert|50|–|70|C}} to create a very good adhesive. Sodium silicate can be added to reinforce these formula.

A related large non-food starch application is in the construction industry, where starch is used in the gypsum [[wall board]] manufacturing process. Chemically modified or unmodified starches are added to the stucco containing primarily [[gypsum]]. Top and bottom heavyweight sheets of paper are applied to the formulation, and the process is allowed to heat and cure to form the eventual rigid wall board. The starches act as a glue for the cured gypsum rock with the paper covering, and also provide rigidity to the board.