Self adhesive material with a water soluble protective layer
The invention relates to self adhesive material (SAM) using water soluble film incorporated with surfactants and/or fillers as a protective layer, eliminating the release liner (backing liner). The water soluble film incorporated with surfactants and/or fillers, used as a protective liner, provides easy breakage, faster dissolution as well as easy application to an object. The invention also relates to a process for the preparation of self adhesive material (SAM) without release liner and an apparatus and a method for applying the self adhesive material (SAM) on an object.
1. A process for producing a self adhesive material (SAM), comprising:
(aa) unwinding a preformed WSF from an unwinder of a coating machine, said preformed WSF having a liner on one surface;
(bb) coating the PSA on a surface of the said WSF opposite the liner;
(cc) drying the WSF coated with PSA in a dryer;
(dd) laminating a face material/substrate on a surface of the PSA opposite the WSF, the face material/substrate selected from a paper, a foil, a polymeric material selected from the group consisting of PVC (poly vinyl chloride), HIPS (High Impact Polystyrene), LLDPE (Linear Low Density Poly Ethylene), heat shrink LLDPE, polyester film, kapton film and combinations thereof, a fabric and combinations thereof, and wherein the face material/substrate includes a material on which graphic or indicia can be printed/written;
(ee) detaching the liner from the WSF to form the SAM; and
(ff) rewinding the SAM on a rewinder.
2. The process of claim 1 , wherein the said drying is carried out in the dryer section at a temperature ranging from 100° C. to 200° C.
3. The process of claim 1 , further comprising storing the SAM for an aging period of 1 to 720 hours.
4. The process of claim 1 , wherein said drying is carried out in a dryer at temperature ranging from 120° C. to 170° C.
5. The process of claim 1 , wherein the laminate is stored for an aging period of of 12 to 360 hours.
6. The process of claim 1 , wherein the laminate is stored for an aging period of 24 to 180 hours.