METHOD FOR MANUFACTURING STOPPERS

摘要

A method for manufacturing stoppers (1) comprising the operations of: preparing a mold (8) inside which there is a cavity (2) which is connected to the outside by means of a lateral hole (3); coupling to the mold (8) a plug (4), which is inserted in the cavity (2) for a predefined length (L) on the opposite side with respect to the lateral hole (3) and is allowed to slide within the cavity (2); and associating an injector with the mold (8) at the lateral hole (3). The method includes the operations of: forming a peripheral slot (6) of constant thickness between the inside wall (3 a) that delimits the cavity (2) and the outer wall (4a) of the plug (4); performing a first injection of plastic material within the peripheral slot (6) in order to obtain a perimetric layer (7) which extends over the predefined length (L); freeing the cavity (2) from the plug (4) by the length (L); and performing a second injection of plastic material in the volume (9) delimited by the perimetric layer (7) in order to obtain a contoured insert (10).