Patent ID: 8641403
Filing Date: 2014-02-04
Classification: B29C,B29L

Abstract:
1. A molding unit for producing opening devices for application to packages of pourable food products; said unit being fed with a web of packaging material having a number of holes; said opening device comprising a spout closed by a membrane detachable from the spout, a neck portion projecting from said spout and to which a cap is fitted releasably, and a pull ring extending from said membrane inside said neck portion and by which to detach the membrane from said spout; said unit comprising a first mold positionable on one side of said web and two second molds positionable on an opposite side of said web, the first and second molds cooperating, at one of said holes, with said web to define a closed cavity, the two second molds being connected to levers permitting the two second molds to move away from said web so as to be detached from said web and movable away from each other to open the cavity; said unit comprising a first and a second matrix adapted to be set to a configuration in which they are located inside the cavity to define a first volume extending between said first matrix and said first and second mold molds and of the same shape as said neck portion and said membrane, and a second volume of the same shape as said pull ring and extending between said first and said second matrix; said first and said second matrix being movable with respect to said web to disengage said opening device from said first and said second volume and permit removal of the opening device by feeding forward said web; said unit also comprising a single actuator, which moves at least said two second molds to/from said web and toward/away from each other, and moves said first and second matrix inside said cavity to/from said web.