Device and method for producing and sealing packagings produced from at least one heat sealable packaging material strip

a technology of packaging material and device, which is applied in the direction of packaging, packaging by pressing/gasifying, transportation and packaging, etc., can solve the problems of limiting the amount of heat transfer and the application of sealing pressure,

Inactive Publication Date: 2004-12-09
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In producing packages with the known kinds of apparatus, the problem arises that over the cross section of the flexible tube formed, there are regions with varying numbers of layers of packaging material.
The presence of different numbers of layers of packaging material over the cross section of the packages is problematic because in forming the transverse seams, it must be assured that the packages later cut apart from the flexible tube of packaging material have adequate tightness.
There are limits, however, to both transferring suitable quantities of heat and applying suitable sealing pressures, especially when critical packaging materials are used or for the sake of output.

Method used

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  • Device and method for producing and sealing packagings produced from at least one heat sealable packaging material strip
  • Device and method for producing and sealing packagings produced from at least one heat sealable packaging material strip
  • Device and method for producing and sealing packagings produced from at least one heat sealable packaging material strip

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Embodiment Construction

[0015] In FIG. 1, a tubular bag-making machine 10, known per se, is shown. The tubular bag-making machine 10 has a forming shoulder 11, which embraces a combined forming and filling tube 12. By means of the forming shoulder 11 and the forming and filling tube 12, a hot-sealable web of packaging material 13, which is drawn from a supply roll not shown and is delivered to the forming shoulder 11 via a feed roll 14, is shaped into a flexible tube 15.

[0016] Two vacuum prestretching belts 18, which serve to prestretch the flexible tube 15, are disposed facing one another on the forming and filling tube 12, below the forming shoulder 11. At the level of the vacuum prestretching belts 18, a longitudinal seam sealing device 20 is also disposed on the front side of the forming and filling tube 12; it welds the two peripheral regions of the web 13 of packaging material, placed one above the other by the forming shoulder 11, into a longitudinal sealing seam 4.

[0017] A raisable and lowerable tr...

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Abstract

A tubular bag-making machine for forming a flexible tube from a hot-sealable web of packaging material sealed longitudinally by means of a longitudinal seam sealing device and transversely by means of a transverse seam sealing device to produce individual tubular bag packages. To improve the transverse sealing seams, bores which can be made to communicate in alternation with a negative-pressure source or an overpressure source are embodied in the sealing jaws of the transverse seam sealing device in regions having a reduced number of layers of packaging material to enable a good heat transfer and a higher sealing pressure in the region of changes in the number of layers of packaging material of the transverse sealing seams.

Description

PRIOR ART[0001] The invention relates to an apparatus and a method for producing and closing packages, made from at least one hot-sealable web of packaging material, as generically defined by the preambles to the independent claims.[0002] One apparatus having the characteristics of the preamble to claim 1 is already known from German Patent Disclosure DE 43 35 577 A1. In producing packages with the known kinds of apparatus, the problem arises that over the cross section of the flexible tube formed, there are regions with varying numbers of layers of packaging material. This can for instance be due to the fact that a previously formed longitudinal seam is wrapped around a wall of the bag, so that in the region of the longitudinal seam there are four layers of packaging material, while in the region immediately next to it there are only two layers of packaging material. It is also usual to fold the web of packaging materials inward in a V in the bottom and top regions, so that in thes...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B65B31/04B65B7/16B65B51/10B65B51/20B65B51/30
CPCB29C65/18B29C66/83543B29C66/1122B29C66/346B29C66/8266B29C66/849B29C66/92445B65B31/046B65B51/30B29C65/743B29C66/8242B29C65/305B29C66/836B29C66/133B29C66/4312B29C66/4322B29C66/81417B29C66/81427B29C65/00B29C65/7847
Inventor NIEVERGELD, HANS
Owner ROBERT BOSCH GMBH
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