Package making – Progressively seamed cover web or web folds – With closing of web between package units
Patent
1996-05-09
1997-11-11
Culver, Horace M.
Package making
Progressively seamed cover web or web folds
With closing of web between package units
493295, 493302, B65B 920, B65B 922
Patent
active
056851324
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention is based on a bag forming, filling and sealing machine as set forth hereinafter. In such a bag forming, filling and sealing machine, a length of packaging material is fed via a hollow forming tube and shaped into a tube. The cross section of the forming tube changes continuously, in the feeding direction of the tube, from a circular cross section to a rectangular cross section at the outlet end, on the underside of the end portion the tube is folded by a folding device to form a folded base or block bottom with side folds drawn inward in a V. A disadvantage here is that the tube is upset in the longitudinal direction along its circumference to a variable extent because of unequal-length jacket lines of the forming tube at the transition from the circular cross section to the rectangular cross section. Particularly in relatively inelastic packaging materials and packaging materials that have a high coefficient of friction, such as paper, this therefore causes corrugation and creasing, which can make sheet feeding more difficult. Depending on the packaging material and the extent of corrugation and creasing, even the appearance and tightness of the bag packages made from the tube can be impaired. There is accordingly a need for a bag forming, filling and sealing machine with which packaging materials with high coefficients of friction and those that tend to corrugation and creasing, such as paper or the like, can be processed into bag packages without creasing.
ADVANTAGES OF THE INVENTION
The bag forming, filling and sealing machine according to the invention has the advantage over the prior art that the differences in length of the jacket lines of the forming tube are minimized, and corrugation and creasing of the packaging material is thus reduced.
Further advantages and advantageous features of the invention will become apparent from the description set forth herein.
An especially slight extent of corrugation and creasing is attained if the intermediate cross section is embodied as square; in that case, the forming tube is especially simple to make. To prevent the forming tube from plugging up with the product, the lower regions of the side walls of the forming tube can be provided with recesses, or alternatively the solid-surface side walls can be replaced by suitably shaped rods.
BRIEF DESCRIPTION OF THE DRAWINGS
One exemplary embodiment of the invention is shown in the drawing and will be described in further detail in the ensuing description.
FIG. 1 is a simplified front view of a bag forming, filling and sealing machine;
FIG. 2 is a simplified longitudinal view of the lower portion of a forming tube;
FIG. 3 is a side view of the forming tube of FIG. 2;
FIG. 4 is a perspective front view of the forming tube of FIG. 3, shown schematically; and
FIG. 5 is a plan view of the lower portion of the forming tube.
DETAILED DESCRIPTION OF THE EXEMPLARY EMBODIMENT
A bag forming, filling and sealing machine 10 has a forming shoulder 11 and a round, substantially hollow-cylindrical forming tube 12 as well as a lengthwise seam sealing device 13, with which a sheet 14 of packaging material can be shaped in a known manner into a tube 16. On both sides of the forming tube 12, at the level of the longitudinal seam sealing device 13, a pull-off device for the tube 16 is provided, in the form of two, for instance vacuum-supported conveyor belts 18. A filling tube 19 for the material for filling the packages extends concentrically within the forming tube 12. Located below the forming tube is a combined crosswise seam sealing and cutting device 21 for sealing bag packages 22 and severing them from the tube 16. A folder device 25 with side folders 26 for folding side folds, intended in a V, in the bottom and optionally top closure of the bag package 22 and for forming a base or block bottom is also disposed above and below the crosswise seam sealing and cutting device 21.
To create a continuous transition from the circular cross section of the upper part of the forming tub
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patent: 4986054 (1991-01-01), McMahon
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Romijn Barend Baastian
Wijkhuizen Alfred
Culver Horace M.
Greigg Edwin E.
Greigg Ronald E.
Robert & Bosch GmbH
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