Injection molding of embossed articles

摘要

An embossed article such as a plastic bowl is injection molded between the molding surfaces of an unidirectional mold. The outer molding surface is inclined outwardly from bottom to top and is provided with an engraved area in which the boss is formed. The undercut upper edge of the engraved area is slanted in a manner to provide an inclined lead in surface on the boss. The undercut of the lead in surface is slight enough that the boss is able to release from the engraved area without damage as the mold opens in unidirectional fashion for removal of the molded article.