The present invention relates to a transfer foil for transferring images onto solid substrates (transfer printing), such as textile supports, in particular T-shirts, metallic supports or plastic, in particular signs, ceramic supports, in particular cups and plates, etc., comprising a two-dimensional carrier based on polyester, based on polyether ether ketones or based on a cellulose-based material, having a layer (a) which is arranged on at least one of the carrier surfaces and which is made of a cross-linked, at least partially hydrolysed polyvinyl alcohol (PVA) polymer, The present invention also relates to the use of same. A further subject matter of the present invention is a ready-to-use system for transfer printing, comprising a transfer foil and an image applied thereto, in particular printed thereon, and a hot melt adhesive.

A printing method includes an image forming step that forms an image on a transfer medium by ejecting colored ink from a first inkjet head, and an undercoat forming step in which undercoat ink is overlaid on the image on the transfer medium by ejecting undercoat ink from a second inkjet head, wherein assuming that a region where an adhesive is applied to the transfer medium at the same timing in an adhesive application step is a process unit region, the process unit region includes a first region and a second region where the undercoat ink is overlaid on the image after the first region, and in the undercoat forming step, an ejection amount of the undercoat ink per unit area to the second region is less than an ejection amount of the undercoat ink per unit area to the first region.