Mass Thermal Transfer Printing
Publication Date: 2003-Jun-19
The IP.com Prior Art Database
Mass Thermal Transfer Printing on Release Coatings
Pressure-sensitive adhesive tape rolls are widely known within a variety of industries and for a wide variety of applications. Typically, a pressure sensitive adhesive comprises a plastic or paper base having a first side and a second side. The second side of the base has a pressure sensitive adhesive layer. In order to prevent the pressure sensitive adhesive layer sticking to the first side of the base when the tape is rolled up, a release layer may be present on the first side of the base. Typical release layers well-known in the art include silicone release layers, carbamate polymers or other polyurethane release layers, and silicone-polyurea release layers. Also known are polyolefin release layers which may include polyethylene, polypropylene, copolymers of ethylene and propylene and blends of these polymers. Other polyolefin release layers may include halogenated polyolefins such as chlorinated polyethylenes.
The release layers can be applied to the base (or the base applied to the release layer) by a number of techniques well known in the art such as solvent coating, aqueous solution coating, aqueous emulsion or dispersion coating, hot-melt coating, hot-melt extrusion, and lamination.
It is also well-known that a release layer may not be required in order to be able to unwind the tape if the base and adhesive layer are selected so as the pressure sensitive adhesive will not strongly adhere to the first side of the base. In such a case, a treatment may be required to allow the adhesive to adhere to the second side of the base. Such a treatment could be prime layer, an additional layer between the adhesive layer and the base, or corona treatment of the second side of the base.
It is known in the industry that pressure sensitive adhesive tapes can be directly printed with mass thermal transfer. The topside of the tape (e.g. the surface from which the adhesive releases dur...