Paper | L-Vis Inline Viscometer: Starch Adhesives

The word “starch” originates from its Germanic root meaning “strong, stiff, strengthen or stiffen” as for centuries in modern times its main use was in textile applications. One may still know from grandma that linen – proving perfect results – needs to be starched during ironing. Also grandpa used to take a natural adhesive like bone glue or starch glue for many of his projects. Industrial starch applications may not be this visible anymore but are widely spread over many applications and processes - for example in the paper and board industry.

Starch is a natural polymeric product, found in many processes as an adhesive or thickener. It is used and delivered most commonly as powder in bulk or bag form. Depending on the industrial application, it is either dissolved cold as it is or cooked.

The usage of starch at corrugated boards or paper laminates is one of the largest applications for non-food starches globally. In this application, starch is used as an adhesive between the paper liners.This adhesive is applied – when e.g. producing corrugated laminates – to the tips of the fluted paper layer which is accordingly pressed to another flat paper, called the liner. During drying under heat the starch adhesive gelatinizes. This creates a strong adhesive for corrugated cardboards or paper laminates.

The starch adhesives are either prepared cold from pre-manufactured starch adhesive powder or cooked together with caustic soda and borax gaining an opaque glue.

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