Trimming of polyester containers using a laser

Abstract From the Canadian patent

A plastic jar is formed by blow molding a combination adapter and jar and thereafter the jar is cut from the adapter using a laser beam. The jar may be blow molded from a preform which is of an injection molded laminated construction so that the wall of the jar is formed of plural layers. The heat generated by the laser beam will melt and bond together these layers as opposed to permitting delamination as would occur should the jar be cut from the adapter by a knife or the like. The cut surface of the jar forms the mouth defining surface of the jar and it is preferred that the cut be inclined at a slight angle to a plane normal to the axis of the jar. Damage to the diametrically opposite …