METHOD FOR MAKING BLOWN VESSEL PROVIDED WITH MOUTH, INSERT FOR BEING EMBEDDED AND MOLDED BY BLOW-MOLDING PARISON, AND BLOWN VESSEL HAVING SUCH EMBEDDED AND MOLDED INSERT

摘要

PROBLEM TO BE SOLVED: To provide a method for making a blown vessel provided with a passage suitable for putting the inside of the vessel into communication with the outside thereof and having a mouth on the outside. ;SOLUTION: A method for making a blown vessel (1) comprises embedding and molding a tubular insert (9) in a parison while it is being blown so that the parison covers one of the ends (10) of the insert, while leaving the opposite side end of the insert projecting outside the vessel, the vessel made from the parison having at least a first layer (7) forming a hydrocarbon barrier and a second layer (6) that is more permeable to hydrocarbons than the first layer and that is outside it and then eliminating at least a portion of the wall lying inside the insert, the insert being shaped to lengthen the diffusion path for hydrocarbons diffusing along the second layer from the edge of the vessel adjacent to the removed wall portion towards the outside of the vessel, and/or to form one or more regions of reduced thickness in said second layer along the diffusion path.;COPYRIGHT: (C)2001,JPO