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| Nursing bottle with integral temperature sensor |
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| Multilayered container |
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| Plastic bottle forming machine |
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| Parison control in longitudinal stretch |
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| Bottle having ribbed bottom |
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| Method for thermal conditioning a thermoplastic parison |
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Containers and cans and method of and apparatus for producing the same
| Details |
Inventors: Thompson, Mortimer S.;
Assignee: Tri-Tech Systems International, Inc. (Maumee, OH)
Primary Examiner: Foster; Jimmy G.
Assistant Examiner:
Attorney, Agent or Firm: Hoare, Jr.; George P.
A container or can having a body and end portion which include free ends comprising plastic materials and which are joined and sealed by cooperatively curling juxtapositioned free ends. The method end apparatus of the invention forms the body portion with an opening surrounded by a free end suitable for curling and forms the end portion with a central portion surrounded by a free end suitable for curling. The container body and end portion are joined by juxtaposing their free ends for forming a plurality of walls, then the plastic in at least one of the free ends is provided in a condition at the time of curling which allows stress and related elastic strain and memory to be imparted to the plastic, followed by curling with a curling tool to intimately engage the ends and concurrently curl the perimeters thereof into a tightly curled configuration, wherein at least the one free end includes internal stress and related strain and memory for providing a seam of integrity and reliability. |
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DETAILED DESCRIPTION In accordance with the present invention, there is provided a new and unique container and method of and apparatus for producing a container which facilitates recycling afteruse, which makes it suitable for microwave heating, which allows for retorting without yielding permanent bulges, which possesses a high degree of sealing integrity for products that are pressurized or under vacuum, which can employ internal pressure or vacuum to enhance sealing integrity, which can be employed to package products at high throughput rates and which are inexpensive.
The container includes a body and end portion which include free ends comprising plastic and are joined and sealed by cooperatively curling the juxtaposed ends.
The container body and end portions are joined by juxtaposing their free ends so that they form a plurality of walls, then the plastic in at least one of the walls is provided in a condition at the time of curling which allows stress and related elastic strain and memory to be imparted to the plastic, followed by curling the walls with a curling tool which restrains the curl circumferentially as it is being formed to intimately engage the ends and concurrently curve the perimeters thereof to one another into a tightly curled configuration.
In accordance with the method of the present invention, beneficial stresses and associated elastic strain and memory are produced in the plastic of at least one of the free ends during curling which, upon at least a partial recovery thereof, produce a tight seam and urge the free ends against one another to promote sealing integrity.
The urging of the free ends against one another preferably continues subsequent to the seaming operation.
Additionally the outermost layers of the curled free ends are strengthened by orientation of the plastic in the direction of the curl.
Also the entire thickness of the curled portion of one or both of the free ends may be strengthened by developing compressive strain in the plastic in at least the hoop direction during the curling
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