Package making – Methods – With contents treating
Patent
1992-08-06
1994-06-28
Culver, Horace M.
Package making
Methods
With contents treating
53433, 53471, 53478, 53281, 53510, 53511, 533292, 533739, B65B 3102, B65B 304, B65B 728, B65B 5120
Patent
active
053235894
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method, end-piece and apparatus for producing a product-filled container, the container comprising a substantially tubular body portion of thin-walled plastic or laminated plastic material, a first butt-weldable end-piece at a first end of the body portion and a second butt-weldable end-piece at a second end of the body portion.
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. It has, however, proven to be difficult to fit the second end-piece without the product in the body-portion open end fouling either the weld-seam or the sealing region. A contributory factor to this problem is, of course, the high production rate which can reach around two units per second.
It is possible to avoid this problem by increasing the so-called "head-space" volume between the product and the inner surface of the end-piece. This can, however, lead to negative consequences for the product if there is the risk that it can react with the air in the said head-space. Furthermore, the customer may discriminate against a container with a large head space volume since it does not appear to be completely full.
SUMMARY OF THE INVENTION
The object of the present invention is thus to provide a method and a device which permits the production of full containers at a high rate and with minimal head-space volume.
This object is achieved in accordance with the present invention by a method for manufacturing a container filled with a product, the container comprising a substantially tubular body portion of thin-waled plastic or laminated plastic material, a first butt-weldable end-piece at a first end of the body portion and a second butt-weldable end-piece at a second end of the body portion, the method comprising:
fitting said first end-piece to said first end of the body portion;
introducing the product into the container via said second end of the body portion;
introducing said second end-piece into said second end of the body portion to an intermediate position at which the second end-piece partially projects into the body portion,
softening the plastic material of an end region of the body portion and the second end-piece through application of heat energy;
pressing the second end-piece into the body portion to a terminal position by means of relative displacement between the second end-piece and the body portion during evacuation of air from within the container via an opening in the second end-piece; and
The invention also provides a device for butt-welding an end-piece having a substantially cylindrical wall region to a substantially tubular body portion of thin-walled plastic or laminated plastic material to form a container, said device comprising:
application means for placing said end-p
REFERENCES:
patent: 2903832 (1959-09-01), Graff et al.
Culver Horace M.
Norden Pac Development AB
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