Package making – Methods – Enclosing contents within progressively formed web means
Patent
1995-11-03
1997-11-18
Moon, Daniel
Package making
Methods
Enclosing contents within progressively formed web means
53416, 53550, 531281, B65B 900
Patent
active
056875495
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a method and an apparatus for forming and filling packages produced from plastic strip.
BACKGROUND
There is a need in this art for a method and an apparatus which makes it possible, starting from a strip of flexible plastic material, to form a web comprising a number of mutually subsequently disposed packaging pockets which are thereafter opened and filled with contents and, after closure, are suitable for transport to the consumer. Such an integrated technique makes it possible to eliminate storage and transport costs for prefabricated strips comprising packaging pockets, at the same time as a manufacturer of the material can simply reset the apparatus so that those packages which are formed in the web are adapted to the dimensions of the products which are to be packed.
Similarly, wishes have been expressed for a technique which makes it possible rationally to open and close such packages, and also efficiently to seal them after filling.
Patent specification DE 832 874 discloses a technique for forming and filling packages produced from a flexible strip of plastic material. Mechanical devices form out of this strip a web which is folded over in the longitudinal direction of the strip and is provided with transverse joints between which are formed storage pockets. The joints are disposed at a region which extends from the lower edge of the folded strip up towards the upper edge portion of the strip. In this relatively wide edge portion, the walls of the strip are movable in relation to one another so as to permit a mechanical filling device to be inserted between the walls. After the filling operation, a closed pocket is formed containing the contents, in that an L-shaped joint is provided along the upper edge of the strip with the catch of the joint connecting to the "counter current" located transverse joint of the filled package. Using scissor or shear devices, the filled packages are separated from the immediately following filled package.
Patent specification DE 832 874 does not disclose how the folded strip is held in the correct position during its displacement between the stations included in the apparatus. The folder plate 6 and subsequent slot 7 are passed by the strip in that the feeder rollers draw the strip over the folder plate and through the slot. Fusion of the walls by means of the hot jaws 10, severing of the joint 11 by means of the scissors 12, displacement of both strip walls through the jaw pair 23,24, displacement of the filled pocket to the position where the filled pocket is sealed by means of the jaws 16, which form an L-shaped weld along the upper edge of the pocket, with the "catch" connecting to the previously partially severed joint, and subsequent precision severing of the strip so that the incision is placed on the previously formed slot all take place without any description of how the strip is positioned transversely (horizontally and vertically).
Naturally, a controlled positioning of the web is necessary in particular on displacement of a filled package. Without such controlled positioning of the web, it is not possible to achieve a reliable and satisfactory function of the apparatus and requisite quality of the finished package. The present invention proposes a technique where such requirements are satisfied.
Patent specification EP 0 054 564 describes a technique in which a web with mutually subsequently disposed, finished packaging blanks are displaced in an apparatus which fills the packaging blanks with their contents and thereafter seals the blanks. On the other hand, this patent specification describes no technique which starts with a strip for producing in one and the same apparatus the packaging blanks and, by sealing of the filled packaging blanks, for forming filled packages.
Thus, patent specification EP 0 054 564 provides no solution to the problem posed here, namely that of producing the packaging blanks in one and the same apparatus starts with a strip of packaging material (plastic material), fi
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Broden Ingemar
Jostler Jan
Joker System Aktiebolag
Moon Daniel
Paradiso John
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