Blocking

The Cause

Blocking is a problem common to a wide range of printing and finishing processes. It describes the tendency of stacked graphics to stick to one another, often leaving an imprint on the bottom of the next stacked graphic. Although the term applies to both laminated and unlaminated graphics, in many cases lamination can prevent blocking in printed graphics. Blocking also applies to adhesion between rolled layers of the same material, and also to adhesives in which the backing paper sticks to the adhesive layer. Various examples are discussed below. 

Problem 1

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