Mandrel for forming a bottom in a packaging container
Patent 4861328 Issued on August 29, 1989. Estimated Expiration Date: 
December 21, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 21, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3196760 3207049 3303761 3405505 3408906 InventorsApplicationNo. 07/289409 filed on 12/21/1988US Classes:493/470, Adapted to be heated or cooled493/183, End flap folding493/184, Forming gable top493/471RotaryExaminersPrimary: Schmidt, Frederick R.Assistant: Showalter, Robert Attorney, Agent or FirmInternational ClassesB31B 3/28 (20060101)B31B 3/00 (20060101) Foreign Application Priority Data1986-06-09 JPAbstractA mandrel used in a packaging machine being in a tubular shape and provided with a cooling chamber at one end so as to cool a plain plate which is positioned at the top of the mandrel and contacts the heated, infolded and compressed bottom of a tubular package carton blank. Four projections are formed on the outer surface of the mandrel so as to contact each corner of the tubular package carton blank to leave it open. A pair of water cooling pipes are provided in the tubular mandrel with a space left between the internal wall of the tubular mandrel and connected to the cooling chamber so that only the bottom of the heat-sealed container made of a tubular package carton blank with thermoplastic coatings thereon is cooled and the side walls of the container are free from moisture condensation. | |
