For the food industry, the adhesive has been granted unconditional approval by ISEGA. Even when tested by immersing in water for 96 hours, it failed to trigger any clouding. High initial tack and very good resistance to oils and aqueous media further characterize the adhesive.
Alongside its other benefits, the 62F grade is not subject to secondary cross-linking (unwanted hardening) in connection with multi-color printing and prolonged UV curing. The adhesive therefore retains its good flow behavior. To ensure that the labels preserve their qualities for their entire life, the new grade offers good resistance to light, heat, water and aging.
In view of its unconditional approval by the German test institute ISEGA, it is also suitable for direct contact with dry, moist and fatty foodstuffs. The new adhesive 62F is most effective in combination with the label film Herma PP 50 transparent (grade 885). Thanks to special surface treatment, this film delivers good print quality with all the conventional printing techniques. It produces visually appealing, glossy and highly transparent labels.
The clear-on-clear adhesive 62F is the latest addition to Herma's range of speciality products. "Grade 62F further underscores our existing strong reputation as a problem-solver," says Thomas Baumgärtner, managing director. "Our standing has encouraged us to focus investment activity on ultra-modern production technology in the last few years."
Herma also recently retrofitted a special, precision-dosing rotating bar nozzle to an existing coating plant for UVA adhesives. The nozzle applies the adhesive within extremely small weight tolerances to achieve an ultra-smooth finish, even with high grammages. "For special clear-on-clear labelstock in particular, this is an essential precondition," he adds.