Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
  • B65D33/00—Details of, or accessories for, sacks or bags
  • B65D33/01—Ventilation or drainage of bags
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
  • B65D33/00—Details of, or accessories for, sacks or bags

Definitions

• the present invention relates to flexible plastic packaging containers.
• Plastic packaging is characterized by the fact that they are lightweight, stable, relatively dense, in particular water and airtight, and thereby inexpensive. They are therefore used extensively in the packaging of free-flowing solids in very many fields, such as e.g. in the chemical industry (granules etc.), in the garden sector (potting soil, fertilizer) and in the food industry.
• the packaging container is made of an endless film web, usually directly before filling.
• Either the endless film web is produced as a tube, or it is done by rounding and welding or gluing in the longitudinal direction, first, the formation of a tube of a flat film.
• the hose is fed to the bottling plant, where a first welding or adhesive seam forms the bottom in the transverse direction and after filling of the contents the container is closed at the top by a second welding or gluing seam in the transverse direction.
• block bottom bags To avoid these problems, it is known in so-called block bottom bags to provide a valve in the soil, through which the overpressure in the Bottling escapes.
• block bottom bags and especially those with elaborate valve constructions are not desirable for reasons of cost for comparatively inexpensive products such as building materials.
• EP 444 261 describes flexible packaging containers in the form of a sack or bag, in which venting takes place through perforations in a region of the container in which it is formed in two layers.
• each perforations are provided in the inner and the outer wall, wherein the perforations in the outer wall should have a smaller cross-sectional area than that in the inner wall.
• the venting then takes place in that an overpressure builds up between the inner and the outer wall, which is intended to allow a controlled outflow.
• a filter is required between the inner and outer walls in order to prevent the contents from escaping.
• these immediately after the escape of pressure overlying perforations form an inlet for air, water and other impurities.
• a flexible packaging container made of plastic, in which by means of welding or adhesive seams, an area is formed, which has an inner and an outer wall, wherein openings are provided in the inner wall, the gas outlet from the interior of the container in allow the area between the inner and the outer wall, and allow the welding seams or adhesive seams enclosing the area at least in a partial area a gas outlet.
• Suitable packaging containers for the purposes of the present invention include, inter alia, FFS hoses, block bags, open gusseted and / or flax sacks, valve box sacks (glued and welded), crossfloor sacks, automatic film (flat) film, etc., in particular FFS packaging.
• packaging containers in which the production takes place from a flat film, so that an overlap exists between the outer edges of the film web in the longitudinal direction due to the production, which can serve as a region between the inner and outer walls. In these packaging containers, a separate training this area is therefore not necessary.
• the area between the inner and outer wall can be formed by applying a separate film by means of welding or adhesive bonding on the film forming the packaging container.
• one or both welded or adhesive seams or seams are formed gas-permeable in the transverse direction. But it is also possible, if present, to form the welding or adhesive seam in the longitudinal direction as a whole or in some areas permeable to gas.
• a preferred way to form the gas permeability is to the surface of the film at the points to be joined or in total by applying a separating medium or by corona treatment to change so that the compound has a reduced strength.
• the order or the treatment can be unilateral or multi-sided, full-surface or partial.
• Suitable media are all media that prevent welding or bonding of the plastic film, such as oils, fats, paints, coatings, powdered solids, etc.
• Paints are particularly preferred, with paints containing a polymeric binder and a solvent having a high vapor pressure being particularly suitable. Pigments are not required according to the invention, but can be included. Examples of suitable lacquers are WP74-076D from XSYS Print Solution, formerly BASF Drucksysteme, and RL 90 CK820-1 from Gebr. Schmidt. The binders in these paints are based on polyamide. Other approved paints and coatings are from Hostmann + Steinberg (Celle); Institute Fresenius: Colors; Merkel Coatings (Gattendorf); Reicolor Chemie GmbH; Sicpa (Helsinki); and Sun Chemical (Niederhausen).
• the weakened connection seam ensures a controlled gas outlet for reducing an overpressure occurring during or after the filling.
• the use of filters or the like, which were required in the prior art to prevent leakage of contents, is not necessary because the openings in the inner wall are covered by the dense, outer wall.
• leakage even of very fine particles is almost impossible. This is based on the fact that adhesion forces act between the two films, which are only partially firmly bonded, which bring about a certain adhesion even without a firm connection due to welding or gluing. Only if the adhesion forces are overcome by a pressure difference, such as the overpressure which develops during or after filling, does the seam open and allow the overpressure to escape. In contrast to the prior art, therefore, neither expensive valve constructions nor perforations of the outer wall are necessary.
• the openings in the inner wall are preferably perforations formed by needling. But it is also possible to provide slots or other gas passage permitting openings.
• the openings, in particular for very fine products, are preferably arranged in such a way that the greatest possible distance from the openings to the (partial) region of the connecting seam results, which enables the gas to escape.
• a preferred embodiment therefore has openings which are arranged centrally in the longitudinal direction, and the gas outlet permitting partial region is formed in one or both transverse seams.
• spacers may be provided between the inner and the outer wall.
• the preparation of the packaging containers according to the invention is carried out essentially as well as that of the containers not provided with a positive pressure ventilation. It is only necessary prior to the attachment of at least one seam, the additional step of a surface treatment, through which in the subsequent production of the seam, a gas permeability of the same is achieved at least in some areas.
• FIG. 1 shows a side view of an FFS packaging.
• FIG. 2 shows a section along the line A-A in FIG. 1.
• FIG. 1 shows a FFS tube 1 which is produced from a plastic film in that it has been folded together in the longitudinal direction such that between the two outer edges of the film 2 and 3 there is a region 4 with an inner wall 5 and an outer wall 6 (see Figure 2) is formed.
• Two weld seams 7 and 8 in the longitudinal direction fix the outer edges 2 and 3 of the film with the underlying or overlying film, so that a hose is formed.
• the packaging container is filled before filling with a Floor forming weld 9 and provided after filling with a weld 10, which closes the package.
• the outer edge 2 of the film is provided on the later to the interior 14 of the container 1 side facing with a release coating 11, which causes the weld 7 allows a gas outlet. Furthermore, along the outer edge 3 in the longitudinal direction perforations 12 and embossments 13 are attached.
• the gas will enter the region 4 through the perforations 12 and is discharged from there through the gas-permeable weld seam 7 to the outside. Any infiltration of contents in the area 4 is harmless, as this can hardly escape through the weld. Also, an ingress of contaminants in the interior 14 is not to be feared, since after the reduction of the overpressure, the inner and the outer film are close to each other and are fixed by adhesive forces in this position.
• FIG. 3 shows an FFS packaging with an alternative gas-permeable connecting seam. Identical parts are marked with the same reference numerals.
• FIG. 3 shows a FFS tube 1, in which a corona-treated region 11 'is provided instead of the release lacquer.
• the transverse welds 9 and 10 allow at the point where the area 11 'is located, a gas outlet at overpressure.
• the openings are formed as perforations 12 only in the middle of the bag. Spacers are not provided here.
• This embodiment is particularly suitable for very finely divided contents, since there is a particularly long path from the openings to the region of the gas outlet. As a result, leakage of filling material can be virtually completely prevented.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Packages (AREA)
• Bag Frames (AREA)
• Orthopedics, Nursing, And Contraception (AREA)
• Sampling And Sample Adjustment (AREA)
• Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
• Containers Having Bodies Formed In One Piece (AREA)

Priority Applications (8)

Applications Claiming Priority (2)

Publications (1)

Family

ID=34925147

Family Applications (1)

Country Status (19)

Families Citing this family (40)

Citations (4)

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• 2004
  • 2004-05-27 PT PT04012528T patent/PT1607339E/pt unknown
  • 2004-05-27 AT AT04012528T patent/ATE390364T1/de active
  • 2004-05-27 ES ES04012528T patent/ES2305612T3/es not_active Expired - Lifetime
  • 2004-05-27 DE DE502004006665T patent/DE502004006665D1/de not_active Expired - Lifetime
  • 2004-05-27 DK DK04012528T patent/DK1607339T3/da active
  • 2004-05-27 EP EP04012528A patent/EP1607339B1/de not_active Expired - Lifetime
  • 2004-05-27 PL PL04012528T patent/PL1607339T3/pl unknown
  • 2004-05-27 SI SI200430749T patent/SI1607339T1/sl unknown
• 2005
  • 2005-05-27 DE DE202005021161U patent/DE202005021161U1/de not_active Expired - Lifetime
  • 2005-05-27 US US11/138,641 patent/US7927015B2/en active Active
  • 2005-05-27 BR BRPI0510651A patent/BRPI0510651B1/pt not_active IP Right Cessation
  • 2005-05-27 MX MXPA06013132A patent/MXPA06013132A/es active IP Right Grant
  • 2005-05-27 EA EA200602128A patent/EA010143B1/ru not_active IP Right Cessation
  • 2005-05-27 CN CNB2005800167600A patent/CN100532215C/zh not_active Expired - Fee Related
  • 2005-05-27 WO PCT/EP2005/005719 patent/WO2005115856A1/de not_active Ceased
  • 2005-05-27 JP JP2007513810A patent/JP2008500241A/ja active Pending
  • 2005-05-27 CA CA2568289A patent/CA2568289C/en not_active Expired - Lifetime
• 2006
  • 2006-10-30 NO NO20064965A patent/NO344897B1/no active IP Right Review Request
  • 2006-11-14 IL IL179247A patent/IL179247A/en not_active IP Right Cessation
• 2008
  • 2008-06-24 CY CY20081100662T patent/CY1110367T1/el unknown
• 2011
  • 2011-03-02 US US13/038,458 patent/US8371752B2/en not_active Expired - Lifetime

Patent Citations (4)

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