Starch and dextrin adhesives are readily available, low in cost, and easy to apply from water dispersion. They are considered to be the least expensive class of paper packaging adhesive. Formulated starch and dextrin adhesives can be applied hot or cold. These adhesives are generally provided to the end-user as powder and mixed with water prior to use to form a relatively thick paste.
RESULTING PROPERTIES
Adhesive for tapes, labels, envelopes, and similar applications required noncurling ability and they should be nonblocking under humid conditions. Certain tape and label adhesive also must be capable of rewetting or remoistening. This generally requires that the formulation contain acid modified starch or high soluble white and yellow dextrins to allow high solids contents. A formulation for a remoistening adhesive that is often used for envelopes is given in the table above.
