a tamper - evident thermoplastic fitment having a spout and a closure for said spout are welded to a polymer - coated paperboard container or to a flexible plastic container . the fitment and closure are initially molded simultaneously but with a substantial space between the two pans interconnected by an elongated runner which conducts molten plastic from the closure to the fitment . upon retraction of the core of the mold , the closure is pulled into the spout until shoulders on the parts engage , whereupon the closure is stripped from the mold core . the runner comprises a tear tab which slides through an apertured space on the closure . when the parts engage tangs on the tear tab engage the space , making the assembly tamper - evident . the fitment has a flange which may be welded or otherwise secured to the container . the tab may be pulled by the consumer to open the container . the closure may be unscrewed from the spout or otherwise disengaged .