Flexo Applied Synthetic Cold Seal Adhesive
Traditional cold seal adhesives for food packaging have had to be applied by patterned gravure. This means for every change in impression length or configuration, a new gravure cylinder had to be re-etched. This is both costly and time consuming.
A new day has arrived. Northwest Coatings introduces a cold seal product that can be applied via the flexographic process. This means that instead of expensive etching and re-etching of cylinders, one only needs to redo a photopolymer plate. This is of particular importance for shorter specialized runs in the confectionery bar market.
This technology also offers the possibility of producing cold seal flexible packaging on existing narrow-web press equipment. As with any water-based product, the cold seal adhesive must be dried before rewinding. This can be achieved with the new OEM or retrofit or high efficiency drying equipment now available for many narrow- web presses. Speeds up to 400 feet per minute can be achieved with adequate drying capacity.
This product can be applied as an overall coat or pattern. It seals packages comprised of BOPP, white OPP, metallized OPP, polyester, and other substrates suitable for food packaging. It releases from release-treated films or release lacquer-coated substrates. It complies with various FDA regulations for food packaging.
Some typical characteristics are:
* When appropriate dry coat weight is applied (typically 2.2 to 3.5 pounds/3000 ft.2), peel strengths vary from 300 to 600 grams per inch.
* Typical release values vary from 25 to 150 grams depending upon the release surface and the amount of cold seal adhesive applied.
o This product does not contain Natural Latex, thereby eliminating a potential source of allergens.
Northwest Coatings is a custom formulator of water-based and UV/ EB coating and adhesives with a reputation for technical innovations. Contact Northwest Coatings for more information.
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Copyright North American Publishing Company Dec 2005