Method for gluing plastic labels on hydrorepellents containers by means of labelling apparatus for water based glues

A method for retrofitting an application apparatus for attaching paper labels to a substrate using water-based-glues to produce an application apparatus for gluing a polypropylene label to a hydrorepellant container, said method comprising the steps of:

• providing an application apparatus for attaching paper labels to a substrate using water-based-glues comprising a paper labels reservoir and a reservoir of water-based glues for paper labels;
• substituting said paper labels reservoir with a label reservoir containing plastic labels, said plastic labels comprising bi-axially oriented polypropylene labels having a side to be glued and an other side, said side to be glued being covered with a first layer of an acrylic material and said other side being covered with a second layer of an acrylic material, one of said first and second layers of acrylic materials comprising a printed layer of ink for non-absorbing materials, said ink containing at least one additive comprising an oxidizing compound salt, said printed layer being covered by a layer of overprinting paint that is receptive of water based glues;
• and
• substituting said reservoir of water-based glues for paper labels with a glue reservoir containing a resin-containing water-based glue, said resin-containing water-based glue comprising a terpolymer and having a viscosity of 70.000±10.000 mPas at 20° C., a pH of 5.5±1.5 and a dry residual of 46±3%.