Dry release transfer
AssigneeKenneth James Reed
InventorsKenneth J. Reed, Alan L. Lythgoe
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Abstract
A dry release transfer is disclosed in which a releasable layer is adhered to a carrier sheet and a stress-resisting transferable design layer is printed on the releasable layer. The releasable layer is normally pre-stressed so that when an external force is applied to the carrier sheet , e.g. by rubbing with a stylus, this force is transmitted to the releasable layer. Since the releasable layer cannot yield to the applied force by stretching, because it is held by the stress-resisting layer, the adhesive bond between the releasable layer and the carrier sheet is weakened or is ruptured or partial or complete cohesive failure occurs within the releasable layer, thereby facilitating transfer of the design layer. A method of producing such transfers is also disclosed.
Claims22
A dry release transfer sheet which comprises a carrier sheet, a releasable layer adhered thereto and a stress-resisting transferable design layer printed on said releasable layer, said releasable layer having low cohesive strength and low tensile strength compared with the transferable layer and providing a surface capable of being wetted with an ink in printing said design layer and said design layer having an elongation at break which is at least 0.5% and a thickness which is at least 3 times the thickness of the releasable layer, whereby application of an external force to the carrier sheet in the region of the design layer causes stressing of the releasable layer and cohesive failure within the releasable layer thus physically releasing the design layer from the carrier sheet and enabling subsequent transfer of the design layer with an underlying portion of releasable layer.
A dry release transfer sheet which comprises a carrier sheet, a releasable layer adhered thereto and a stress-resisting transferable design layer printed on said releasable layer, said releasable layer having low cohesive strength and low tensile strength compared with the transferable layer and providing a surface capable of being wetted with an ink in printing said design layer and said design layer comprising a cross-linked photopolymerised ink film having an elongation at break which is at least 0.5% and a thickness which is at least 3 times the thickness of the releasable layer, whereby application of an external force to the carrier sheet in the region of the design layer causes stressing of the releasable layer and cohesive failure within the releasable layer thus physically releasing the design layer from the carrier sheet and enabling subsequent transfer of the design layer with the whole or part of its underlying portion of releasable layer.
A dry release transfer which comprises a carrier sheet, a thin releasable layer adhered thereto and a stress-resisting transferable design layer printed on said releasable layer, said transferable design layer having an elongation at break which is at least 0.5% and a thickness which is at least 3 times the thickness of the releasable layer, said releasable layer comprising a wax containing composition and having low cohesive strength and low tensile strength compared with the transferable layer, whereby application of an external force to the carrier sheet in the region of the design layer causes weakening or rupture of the adhesive bond between the design layer and the carrier sheet accompanied by partial or complete cohesive failure within the releasable layer thus physically releasing the design layer from the carrier sheet and enabling subsequent transfer of the design layer with an underlying portion of the releasable layer.
Dependencies are inferred from the claim text.