the coated material can be rolled up or stacked after the adhesive has been applied. The product is characterised by a high hot tack (fast tack), a wide range [...] sale or of use. For every bag type, there is a sealing system. Adhesives are applied by roller or by nozzle. The bonding undergoes strict stress testing, for instance [...] Bag closing systems such as pasted valves or sealable lines of adhesive are applied to the bag directly during manufacturing. The valves or bag surfaces prepared
https://www.jowat.com/en-CA/newsroom-detail/flexible-packaging-sealing-closure/