Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
  • B65B25/00—Packaging other articles presenting special problems
  • B65B25/001—Packaging other articles presenting special problems of foodstuffs, combined with their conservation
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
  • B65B25/00—Packaging other articles presenting special problems
  • B65B25/16—Packaging bread or like bakery products, e.g. unsliced loaves

Definitions

• the invention relates to a method for packaging foods, in particular baked goods, according to the preamble of the patent claim.
• the two-stage sealing process according to DE-OS 32 19 267 cannot be used for packaging baked goods with film material in such a way that in a so-called fin pack with a longitudinal sealing seam and two diametrically arranged transverse sealing seams, the one transverse sealing seam contains an opening through which separate resealing is closed.
• DE-AS 1 060 309 proposes to avoid the above-mentioned problem of subsequent mechanical action on the packaging for closing an opening through which water vapor can escape to the outside during the heat treatment of the packaged object at elevated temperature invert the baked goods to be packaged in each case at least two packaging bags, the bag openings being folded over, so that steam forming during sterilization can escape to the outside through the folded-over package openings.
• the folded ends of the packaging bags should stick together.
• the two bags themselves should also stick together and seal the packaged goods from the outside air. Due to the fact that the bags cannot be folded or folded around the packaged goods without wrinkles, the formation of air channels is unavoidable, with the result that airtight packaging cannot be produced using this method.
• US Pat. No. 3,937,396 proposes to provide a ventilation opening in the area of a sealing seam, which operates in the manner of a flap valve in such a way that when a predetermined pressure is reached inside the packaging, it can be reduced to the outside through said opening, preferably with the escape of water vapor that forms when the package and its contents are heated. Subsequently, the above-mentioned opening closes again automatically or automatically, a hermetic closure to the surroundings being ensured due to the flap valve-like construction.
• the present invention is based on the object of creating a method for packaging foodstuffs, using which the sealed seam is and remains absolutely aroma- and moisture-tight again without mechanical action after the heat treatment of the packaged goods.
• the measures according to the invention ensure that the packaging is sealed in the usual way and that pressure is nevertheless created in the packaging during the ' sterilization or pasteurization process, in which the water vapor generated in the packaging through a specifically formed opening in the Area of the sealing seam can escape to the outside, with this opening then closing itself in an aroma-tight manner, that is to say without separate post-treatment, in particular post-sealing or bonding.
• hot glue, wax or similar sealing medium is placed on the packaging or wrapping material at predetermined points in the area of an edge seal using a hot glue application device integrated in a wrapping material take-off system of a packaging machine, " sterilization " takes place or pasteurization under elevated temperature at these points, melting of the hot glue or wax with the result that a controlled opening for the described pressure equalization forms.
• the opening closes with the corresponding cooling of the packaging material and curing of the sealing medium automatically, so that an absolutely tight seal is produced.
• the automatically forming and reclosing openings preferably have a width of approximately 0.5 to 5.0 mm, in particular approximately 2.0 mm. The number of such
• Openings and their width naturally depend on the packaging volume and the contents of the packaging. Three to four openings of the stated width are sufficient for packaging 10 to 20 slices of toast.
• Hose packings are preferably used for this purpose, which are sealed transversely on the end face. The said pressure equalization openings are then preferably formed only on one of the two transverse sealing seams.
• the method according to the invention and the corresponding devices for it can be integrated into existing packaging systems with little effort.
• FIG. 2a, 2b a first embodiment of a packaging prepared according to the invention in a schematic side view and in a schematic cross section at the level of the transverse sealing seams on the end face.
• the method according to the invention is to be explained in more detail with reference to FIGS. 1 a, 1 b with regard to the process sequence in the conveying direction of the product to be packaged, the product to be packaged being a group 10 of toast bread slices lying close together.
• the direction of conveyance of the product 10 to be packaged through the packaging unit (not shown in detail) is indicated by arrow 11.
• the corresponding conveyor belt is provided with the reference number 12. Accordingly, the sliced toast bread 10 is first placed within a tubular film section 0 1. Then there is one at each end
• cross seam sealing the front cross sealing seam 14 viewed in the conveying direction 11 being to be closed continuously, while the diametrically arranged cross sealing seam 15 has at least one opening 16 through which pressure equalization between the inside of the packaging and the outside during the hot sterilization or pasteurization Environment takes place and through which water vapor developing inside the packaging can escape, particularly during sterilization or pasteurization (see arrow 17).
• the aforementioned Q sterilization or pasteurization at elevated temperature takes place within a separate station 18 of the packaging unit, which is not shown in detail. After leaving the sterilization or pasteurization station 18, the package and its contents 10 are cooled again to ambient temperature.
• the opening 16 is automatically closed in the region of the transverse sealing seam 15, so that the transverse sealing seam 15 is also continuously airtight and aroma-tight.
• FIGS. 2a, 2b in the area of the transverse sealing seam 15, two fields 19 arranged at a distance from one another are provided with hot glue or wax, which remain open during the usual manufacture of the transverse sealing seam 15, forming the above-mentioned pressure compensation openings in the area of the transverse sealing seam 15. Only at the elevated sterilizing or pasteurizing temperature should the hot glue or wax melt at the points 19 and also distribute itself immediately.
• transverse sealing seam 15 is sealed airtight and aroma-tight.
• a continuously closed transverse sealing seam 15 corresponding to the transverse sealing seam 14 is formed automatically.
• the length of the opening fields 19 in the area of the transverse sealing seam 15 corresponds in total to approximately twice the width of the transverse sealing seam 15. A sufficient pressure equalization is then ensured during sterilization or pasteurization, so that an uncontrolled bursting of the packaging is avoided.
• the packaging material 13 is a conventional heat sealable packaging material, e.g. B. plastic coated paper.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Packages (AREA)
• Package Closures (AREA)

Applications Claiming Priority (4)

Publications (1)

Family

ID=25874254

Family Applications (1)

Country Status (3)

Cited By (1)

Families Citing this family (2)

Citations (1)

Family Cites Families (7)

• 1988
  • 1988-11-28 DE DE19883840104 patent/DE3840104C1/de not_active Expired - Lifetime
• 1989
  • 1989-11-15 AU AU45120/89A patent/AU4512089A/en not_active Abandoned
  • 1989-11-15 WO PCT/EP1989/001372 patent/WO1990005668A1/de unknown

Patent Citations (1)

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