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You must follow information about coating weight suggestions from the coating supplier religiously. Insuffient coating deposition obviously will cause poor or zero adhesion.
Heat seal coatings are formulated materials that are applied to a substrate on a coater and then wound into a roll. In a subsequent operation, the coated material is unwound and the heat seal coating is adhered to another surface with heat and pressure. The heat seal coating functions as an adhesive that bonds the two surfaces together. An advantage of this type of adhesive is that it does not have to bond immediately as with a laminating adhesive. Instead, the bonding operation is a distinctly separate operation from the coating operation.
A problem that can occur with heat seal coatings is that they can block when wound into a roll. This is essentially premature adhesion and causes the roll of heat seal coated material to form a log that cannot be unwound. Obviously, the roll is completely unusable.
How can you prevent such blocking? The first step is to understand its causes. This month and next, we will...