Abstract: A method for preparing a microporous ink-impregnated marking structure according to the invention involves use of a window-like frame instead of a conventional chase. The frame is placed on the upper face of the matrix board or mold so that the premix, containing ink, plasticizer and resin, is retained therein. The premix fills the cavities and excess premix forms a continuous layer over the cavities in the mold, with the edges of the layer retained by the frame. A layer of an ink-absorbent backing material is placed on the layer of premix, and the backing is covered with a plate. The assembly is heated with pressure to form a microporous, marking fluid impregnated structure having a relief pattern corresponding to the cavities, and then cooled. The marking structure can then be used to make self-inking hand stamps.

Abstract: A premix capable of forming a microporous marking structure is prepared by kneading a pouch containing the premix, then opening the pouch and removing the premix therefrom. The mixed premix is then typically poured in a mold, and an absorbent backing layer is placed on the premix. The premix is then heated to form a microporous structure, and then cooled. The dispensing package used in this method is a thin-walled, flexible pouch which contains the premix. This dispensing pouch can eliminate the need to make up a batch of premix immediately prior to casting, together with the need to measure the amount of premix needed for each casting.

Abstract: An improved microporous marking structure has a layer of a microporous material containing a marking fluid and an absorbent backing layer superposed thereon which shortens processing time by absorbing excess marking fluid from the microporous layer. The marking structure according to the invention may be advantageously used to make a self-inking hand stamp. No lengthy step for removing excess ink from the microporous layer is needed.

Abstract: An improved microporous marking structure has a layer of a microporous material containing a marking fluid and an absorbent backing layer superposed thereon which shortens processing time by absorbing excess marking fluid from the microporous layer. The marking structure according to the invention may be advantageously used to make a self-linking hand stamp. No lengthy step for removing excess ink from the microporous layer is needed.