Machine for forming seams of two-piece paper cups

Patent 4490130 Issued on December 25, 1984. Estimated Expiration Date:

December 25, 2001. 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.

Abstract Claims Description Full Text

Patent References

2942530

3134307

3364825

3724093

3825408

Heating the end of a tubular member
Patent #: 4035926
Issued on: 07/19/1977
Inventor: Farfaglia

Heading machine
Patent #: 4074619
Issued on: 02/21/1978
Inventor: Feliks

Apparatus for producing containers
Patent #: 4317323
Issued on: 03/02/1982
Inventor: Richards , et al.

Method for manufacturing two-piece containers from filled thermoplastic sheet material Patent #: 4349400
Issued on: 09/14/1982
Inventor: Gilden

Inventors

Assignee

Paper Machinery Corporation

Application

No. 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

Examiners

Primary: Coan, James F.

Attorney, Agent or Firm

Nilles; James E.

International Classes

B29B 13/02 (20060101)
B29B 13/00 (20060101)
B31B 17/00 (20060101)
B29C 65/00 (20060101)
B29C 35/04 (20060101)

Abstract

In 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.