Package making – Methods – Closing package or filled receptacle
Patent
1992-08-06
1994-04-26
Culver, Horace M.
Package making
Methods
Closing package or filled receptacle
533292, 533293, 156 69, B65B 728, B65B 5120, B65B 5132
Patent
active
053055837
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method and apparatus for controlling the temperature of a container end portion during manufacture.
BACKGROUND
Tubes and bottles made from thin-walled plastic or plastic laminated material are used for packaging of, for example, creams, ointments and various other viscous chemical/engineering preparations. Swedish Patent Application 8800548-3 describes an end-piece and a method for manufacturing tubes or bottles by butt-welding an end-piece in both ends of a tubular-shaped body portion of thin-walled plastic or laminated plastic material.
The advantage of manufacturing tubes or bottles in this way is that the need to transport bulky empty containers over long distances is avoided. Accordingly the method allows the private packager to produce his own tubes or bottles without comprehensive equipment.
The tube or bottle produced according to the above method can be filled with its product via its opening, after which a cap is affixed over the opening with the aid of, for example, screw threads.
In many cases, however, it is desirable to provide a container which has been sealed in a controlled environment so that the customer can confirm that the packaging is unopened. This results in enhanced quality, both for the packaging and its contents.
During production of such a sealed container it is advantageous that filling with the product occurs between the fitting of the first end-piece, preferably tubularly formed, and the second end-piece.
In the method according to said Swedish Patent Application 8800548.3 tubular-shaped body portions are located on a rotary indexing table for movement between various stations. At one station each end-piece is introduced into the upper end of a corresponding body portion by a piston to an intermediate position where it partially projects into the body portion. This partially assembled work piece is then moved to the next station where heating energy is supplied to the circumferential end region of the tube and intersecting region of the end piece. Once a temperature is attained at which the material is sufficiently soft, the work piece is advanced to the subsequent station where a piston is reapplied to push the end piece to its terminal position. Rapid cooling of the welding site is then achieved by means of passages within the piston for a cooling fluid.
SUMMARY OF THE INVENTION
Up until now it has proved impossible to apply the end-piece with the piston in situ during heating since the rim of the end-piece upon which the piston acts is subjected to heating to between 300.degree. C.-500.degree. C., thereby softening the material and causing it to adhere to the piston.
The object of the present invention is thus to provide a method and an apparatus which permits the production of filled containers at a high rate whilst avoiding the above-mentioned problem.
This object is achieved according to the invention by a method for manufacturing a container by sealing an end-piece having a transverse wall portion and a peripheral portion to an open end portion of the container, the method comprising the steps of:
introducing the end-piece into the open end portion of the container to an intermediate position such that the end-piece partially projects into the open end portion;
heating the open end portion and the peripheral portion of the end-piece so as to soften the open end portion and the peripheral portion, and
displacing the transverse wall portion of the end-piece to its terminal position relative to the open end portion while simultaneously cooling the transverse wall portion of the container.
The present invention also provides an apparatus for manufacturing a container by sealing an end-piece having a transverse wall and a peripheral portion to an open end portion of the container, comprising:
displacement means for displacing the transverse wall of the end-piece into the open end portion of the container to an intermediate position relative to the open end portion;
heating means for heating the open end portion and t
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Culver Horace M.
Norden Pac Development AB
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