Method for production of a glass product with an optically different part or a part different in color, the glass product, especially a glass with a stem

摘要

First, the cup (1) and the preform (3) of the styling (33) are formed separately. A body (2) with different color and / or optical properties is placed in the weld plane of the preform (3) with the cup (1), then the preform (3) is pressed and welded to the cup (1). The body (2) surrounds the preform (3) and / or the cup (1) when the preform (3) is pressed against the cup (1). This position allows the body (2), after pressing the preform (3) to the cup (1), to be attached to the mass of the preform (3) as well as to the mass of the cup (1), while the subsequent drawing of the preform (3) into the final shape of the style (33), at the same time, the body (2) is formed into the resulting shape of the stretched body (22). When pulling the preform (3), its stem along with the body (2) is lengthened and thinned, wherein the exterior surface of the enamel in the weld zone of the preform (3) with the calyx (1) is smoothed out by the flow of molten glass. The body (2) can be placed in the weld plane together with a pre-shape (3) at the end of which the body (2) is inserted, preferably so that when casting the preform (3) the body (2) is inserted into the mold into which it is subsequently impressed enamel.