COMMON COLD SEAL ADHESIVE PROBLEMS: PART III
In parts one and two of this blog post series, we looked at various common cold seal adhesive problems and their causes. Now, take a look at a few more to better understand what might be happening with your cold seal adhesive.
Picking
Picking occurs when the cold seal adhesive is transferred onto the release surface or machine rollers. Impacting production line efficiency and package performance, picking is typically caused by:
- Poor anchorage of the cold seal adhesive to the base substrate
- An affinity for release surface or rollers
- Under-stirred cold seal adhesive
Under-Drying
Under-drying occurs when the cold seal drying process has failed to raise the adhesive film to >70°C (158°F). This temperature is needed to film-form the polymers and obtain good anchorage to the base web. An indicator of under-drying is that the cold seal adhesive will have low seal strengths and anchorage.
Under-Stirring
Under-stirring is a common problem that occurs when the cold seal adhesive was insufficiently stirred prior to use. Sometimes, this is done in an attempt to overcome any effects caused by phasing during storage. Under-stirring causes the cold seal to become polymer or latex rich when printed, which impacts the desired performance level.
Addressing Common Cold Seal Adhesive Problems
Working with the right cold seal adhesive supplier can help avoid picking, under-drying and under-stirring issues. At Bostik, we form a partnership with our customers and conduct thorough preventive measures to ensure the right product is chosen for their needs.
If you’re having any of these cold seal adhesive problems, please contact us at 800-7-BOSTIK, or visit www.bostik.com.