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
  • B65D77/00—Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks or bags
  • B65D77/22—Details
  • B65D77/225—Pressure relief-valves incorporated in a container wall, e.g. valves comprising at least one elastic element
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T137/00—Fluid handling
  • Y10T137/7722—Line condition change responsive valves
  • Y10T137/7837—Direct response valves [i.e., check valve type]
  • Y10T137/7879—Resilient material valve
  • Y10T137/7887—Center flexing strip

Definitions

• the invention relates to a pressure relief valve for a packaging container.
• a pressure relief valve known from DE 31 47 321 C2 has a cup-shaped carrier body with a flange region running around the wall, the flange region being connectable to the inside of a material web which forms the packaging container.
• a membrane is arranged with play on the edge of the support body. The membrane is held by a bone-shaped hold-down device in plan view against the bottom of the
• the known pressure relief valve thus requires three components, in particular the assembly of the membrane and the hold-down device in the carrier body is relatively complex.
• the pressure relief valve according to the invention for a packaging container with the features of claim 1 has the advantage that it consists of only two components and is therefore less expensive to manufacture.
• Advantageous developments of the pressure relief valve according to the invention are specified in the subclaims.
• the depression has the shape of at least two intersecting circles. This special shape surprisingly enables a particularly good response behavior of the pressure relief valve, that is to say that the pressure relief valve opens, for example, at an excess pressure of already 2 mbar.
• the recess in the form of a company logo or a protected figurative mark, so that a particularly good recognition value of the overpressure valve is achieved without particularly low opening pressures. It is also preferably provided to form a gap between the top of the membrane and the top of the edge region of the carrier body. This ensures a safe passage of the
• Gases guaranteed to the at least one opening in the packaging container are guaranteed to the at least one opening in the packaging container.
• a particularly simple design of the membrane with simultaneous creation of the passages for the gas for opening in the packaging container is achieved if the membrane is strip-shaped.
• FIG. 1 shows a plan view of a first pressure relief valve according to the invention
• FIG. 2 shows a section in the plane II-II of FIG. 1
• 3 shows a plan view of a membrane as used in the pressure relief valve according to FIGS. 1 and 2
• FIG. 4 shows a top view of a second pressure relief valve according to the invention
• FIG. 5 shows a section corresponding to FIG
• FIG. 6 is a perspective view of a packaging container
• Packaging container with a pressure relief valve Packaging container with a pressure relief valve.
• a first pressure relief valve 10 is shown in FIGS. 1 and 2.
• the pressure relief valve 10 has a carrier body 11 made of plastic, in particular polyethylene, which is preferably in the
• the carrier body 11 has a round shape in plan view, but it can also have a different shape, for example a square shape.
• the carrier body 11 is designed as a flat, cup-shaped body and, as can best be seen from FIG. 2, has a circumferential edge region 13 which is raised in relation to a central region 12.
• the top of the edge region 13 has a likewise circumferential, approximately triangular-shaped elevation 14.
• the shape of the elevation 14 serves to connect the pressure relief valve 10 or the carrier body 11 to a packaging container by ultrasonic welding (or another thermal sealing method).
• several elevations 14, preferably arranged concentrically to one another, can also be formed.
• a recess 15 is formed in the central region 12, which has the shape of two intersecting circles 16, 17.
• the depression 15 is lowered by approximately 0.2 mm with respect to the upper side 18 of the central region 12.
• a through hole 19, 20 is formed in the carrier body 11 in the center of each of the circles 16, 17.
• the diameter of each through hole 19, 20 is 1 mm, for example.
• the arrangement of the recess 15 in the central region 12 is centered with or aligned with the carrier body 11.
• the upper side 18 of the central region 12 is partially covered by a membrane 22.
• the membrane 22 shown individually in FIG. 3 has a shape adapted to the inner contour 23 of the edge region 13, a straight edge 24, 25 being provided on each of two opposite sides.
• the membrane 22, which is also made of plastic, preferably polyester, has a maximum thickness of approximately 0.1 mm and, owing to its material (polyester with a sealable coating), can be sealed against the upper side 18 of the central region 12 of the carrier body 11.
• the arrangement of the membrane 22 within the inner contour 23 of the carrier body 11 is such that the edges 24, 25 are perpendicular to a center axis 26 which intersects the centers of the circles 16, 17.
• a membrane-free zone 27, 28 is formed between the edges 24, 25 and the inner contour 23 of the carrier body 11.
• FIG. 1 two opposing sealing zones 31, 32 are also shown, via which the strip-shaped membrane 22 is connected to the upper side 18 of the carrier body 11. It can be seen that the sealing zones 31, 32 extend from the areas outside the edges 24, 25 to to the edge of the respective circular arc-shaped contour 33, 34 of the membrane 22.
• a sealing fluid in particular silicone oil, is arranged between the top side 18 of the carrier body 11 and the membrane 22. It can also be seen from FIG. 2 that a distance a is formed between the upper side of the elastic membrane 22 and the upper side of the carrier body 11.
• the pressure relief valve 10a according to FIG. 5 differs from the pressure relief valve 10 according to FIGS. 1 and 2 in that a circumferential adhesive layer 37 is applied to the top of the edge region 13a of the carrier body 11a. Instead of the triangular elevation 14 in the pressure relief valve 10, the adhesive layer 37 serves to connect the pressure relief valve 10a to the inside 2 of a packaging material web 3.
• the packaging material web 3 is part of a packaging container (not shown in FIG. 5), which is used, for example, to pack coffee.
• a plurality of openings 4 are formed in the packaging material web 3 within the edge region 13a.
• the openings 4 can, for example, as is generally known, be formed by means of a suitable piercing tool during or after the attachment of the pressure relief valve 10a to the packaging material web 3, the number and size of the openings 4 depending on the application.
• a pressure relief valve 10, 10a can be described in such a way that gas arising within a package initially comes into the area of the through hole or holes 19, 20 as a result of the gas overpressure.
• the overpressure which then acts within the recess 15 on the facing side of the membrane 22, has the consequence that, with a sufficiently high internal pressure, the membrane 22 lifts off outside the sealing zones 31, 32, with channels form from the recess 15 towards the membrane-free zones 27, 28, via which the gas is discharged between the top 18 of the carrier body 11, 11a and the membrane 22.
• the gas then reaches the membrane-free zones 27, 28 via the openings 4 in the packaging material web 3 of the package
• FIG. 6 The cuboid packaging container 5 shown in FIG. 6, which is used in particular for packaging coffee, is folded out of a section of a packaging material web by means of devices known per se, for example by means of a so-called mandrel wheel machine. A sealed head closure 6 and a sealed bottom closure 7 folded against the underside of the packaging container 5 can be seen.
• a pressure relief valve 10 is arranged on the inside of one side wall 8, with only a circular contour 9 from the outside due to the ultrasonic welding of the pressure relief valve 10 with the packaging material, and the openings 38 in the side wall 8 are visible.
• Another pressure relief valve 40 is shown in FIG.
• the pressure relief valve 40 differs from the pressure relief valves 10 and 10a essentially in that the recess 42 in the pressure relief valve 40 has the shape of a stylized armature 43.
• the shape of the armature 43 which is a protected figurative mark, makes it possible to recognize the manufacturer of the pressure relief valve 40 from the outside.
• three through holes 44 are formed within the recess 42.
• Membrane-free zones 45, 46 are located parallel to an axis 47 formed by the three through holes 44 outside the membrane 48.
• connection of the membrane 48 to the upper side of the carrier body 50 takes place at the pressure relief valve 40 in the lateral areas of the strip-shaped membrane 48 outside the depression 42 in the connection zones 51, 52, so that the membrane 48 in the regions between the through holes 44 in the direction of the membrane-free zones 45, 46 is not connected to the carrier body 50, so that gas can escape to the membrane-free zones 45, 46.
• the pressure relief valves 10, 10a, 40 described can be modified in a variety of ways without deviating from the inventive concept, which consists in the pressure relief valve 10, 10a, 40 comprising only two components, the carrier body 11, 11a, 50 and the membrane 22, 48 exists, which are captively connected to one another and wherein a recess 15, 42 is formed in the region of through holes 19, 20, 44, which is covered by the membrane 22, 48.
• other shapes of the depressions are conceivable, which in particular should result in the lowest possible opening pressure.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Packages (AREA)
• Closures For Containers (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=32308920

Family Applications (1)

Country Status (6)

Families Citing this family (5)

Citations (2)

Family Cites Families (8)

• 2002
  • 2002-12-02 DE DE2002156245 patent/DE10256245A1/de not_active Withdrawn
  • 2002-12-02 DE DE2002221455 patent/DE20221455U1/de not_active Expired - Lifetime
• 2003
  • 2003-10-13 WO PCT/DE2003/003388 patent/WO2004050505A1/de active Application Filing
  • 2003-10-13 JP JP2004555994A patent/JP2006507997A/ja active Pending
  • 2003-10-13 EP EP20030773507 patent/EP1569858B1/de not_active Expired - Lifetime
  • 2003-10-13 US US10/537,245 patent/US20060144452A1/en not_active Abandoned
  • 2003-10-13 ES ES03773507T patent/ES2367110T3/es not_active Expired - Lifetime

Patent Citations (3)

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