Heating the end of a tubular member
Apparatus for producing containers
Method for manufacturing two-piece containers from filled thermoplastic sheet material Patent #: 4349400
ApplicationNo. 06/291323 filed on 08/10/1981
US Classes:493/106, And frustoconical form432/226, HAVING MASK, BAFFLE OR CONDUCTOR CONCENTRATING HEAT ON OR PROTECTING SECTION OF ARTICLE493/134By direct application of fluid
ExaminersPrimary: Coan, James F.
Attorney, Agent or Firm
International ClassesB29B 13/02 (20060101)
B29B 13/00 (20060101)
B31B 17/00 (20060101)
B29C 65/00 (20060101)
B29C 35/04 (20060101)
AbstractIn a machine for making two-piece flat bottom paper cups, having a mandrel on which the cup is formed, the portions of the two blanks that are to form the bottom seam are heated by a device comprising a stationary air duct with which the mandrel can be coaxially aligned. Air flowing forwardly in the duct from an inlet at its rear is heated by an electric element therein. On the front of the duct a nozzle is mounted to slide between a forward operative position and a rearward inoperative one. Cooperating throttle elements on the nozzle and the duct restrict flow to radial outlets in the nozzle when it is in operative position, ensuring steady air flow through the duct. An annular heat shield around the nozzle enables it to effect combined radiant and hot air heating. All heaters are arranged for retraction if the machine stops for longer than a normal dwell period.