EP0004932B1 - Wiederverschliessbare Öffnungsvorrichtung in einer Wand eines Verpackungsbehälters und Verfahren zu deren Herstellung - Google Patents

Wiederverschliessbare Öffnungsvorrichtung in einer Wand eines Verpackungsbehälters und Verfahren zu deren Herstellung Download PDF

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Publication number
EP0004932B1
EP0004932B1 EP79101099A EP79101099A EP0004932B1 EP 0004932 B1 EP0004932 B1 EP 0004932B1 EP 79101099 A EP79101099 A EP 79101099A EP 79101099 A EP79101099 A EP 79101099A EP 0004932 B1 EP0004932 B1 EP 0004932B1
Authority
EP
European Patent Office
Prior art keywords
wall
film
opening
section
cut
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP79101099A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0004932A3 (en
EP0004932A2 (de
Inventor
Billy Ljungcrantz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tetra Laval Holdings and Finance SA
Tetra Pak Developpement SA
Original Assignee
Tetra Laval Holdings and Finance SA
Tetra Pak Developpement SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tetra Laval Holdings and Finance SA, Tetra Pak Developpement SA filed Critical Tetra Laval Holdings and Finance SA
Publication of EP0004932A2 publication Critical patent/EP0004932A2/de
Publication of EP0004932A3 publication Critical patent/EP0004932A3/de
Application granted granted Critical
Publication of EP0004932B1 publication Critical patent/EP0004932B1/de
Expired legal-status Critical Current

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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
    • B65D5/00—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper
    • B65D5/42—Details of containers or of foldable or erectable container blanks
    • B65D5/70—Break-in flaps, or members adapted to be torn-off, to provide pouring openings
    • B65D5/708—Separate tearable flexible elements covering a discharge opening of a container, e.g. adhesive tape
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S493/00—Manufacturing container or tube from paper; or other manufacturing from a sheet or web
    • Y10S493/963—Opener, e.g. tear strip

Definitions

  • the invention relates to a reclosable opening device on a wall of a packaging container with a wall cut-out delimited by an opening outline in the wall, which can be removed to expose a pouring opening in said wall, with a cover film lying on the wall cut-out, which in the area of the Opening outline can be removed from the wall and is connected by means of an inseparable connection both to the wall at a connection point outside the opening outline and to the wall cut-out, so that the wall cut-out can be lifted off when the cover sheet is pulled up and put back on its starting position to close the pouring opening can be reintroduced into this, and with an inner film which is inserted between the cover film and the wall and covers the wall section and an edge region surrounding the wall section and which has an inseparable connection with the wall section and with which the cover film is inseparably connected both to the wall cutout and to the connection point outside the opening outline.
  • the invention also relates to a method for producing such an opening device.
  • the object of the invention is to enable the partial tasks mentioned above to be solved as completely as possible.
  • the manipulation and reclosing of the opening device should be facilitated without complicating the manufacture.
  • the invention consists in that the opening outline or wall cut-out by a closed or by an endless, e.g. is defined by punching, defined line, and that the inner film is inseparably connected to the wall area of the wall surrounding the wall cutout and is formed in one piece with the cover film from a film strip which is folded over 180 ° along a connection point of the cover film with the inner film, transverse folding line is.
  • the opening device according to the invention is particularly advantageous in comparison with the closest prior art mentioned at the beginning, because the areas which are not connected between the cover film part and the inner film part form a kind of hinge joint and the pivoting of the stiffer, with regard to its outline, by the closed line well-defined wall part even allowed inside the actual pouring opening. Without making production more difficult, not only opening but also reclosing is much easier.
  • a material other than the wall of the packaging container can be selected for the cover film and the inner film; it is only necessary to ensure that the inner film can be inseparably connected to the wall.
  • a particularly preferred method for producing the opening device consists in that an opening outline is provided in the wall, which delimits a wall cutout that can be removed from the wall in order to release a pouring opening, a cover film being inseparable from both the wall opening and the wall opening cut as well as connected to the wall outside the wall cutout and a film strip is placed on the wall, which covers the wall cutout with a first section of the wall such that this section of the film strip is inseparable from the wall, at least on the wall cutout and on the wall cutout surrounding wall area is connected.
  • the opening outline when the opening outline is produced, this is also applied along a closed line in the first section of the film strip, and a second section of the film strip is placed on the first section and inseparably connected to it in the area of the wall section covering it.
  • the packaging container 10 shown in FIGS. 1 to 4 is parallelepiped-shaped and intended for liquid contents.
  • the upper, flat end wall 11 of the packaging container contains an opening device 12 designed and manufactured according to the present invention, which is shown in FIG. 1 in its open position. With this device, a pouring opening 13 can be opened, which allows unhindered pouring out of the liquid filling material.
  • the opening device 12 is hermetically sealed in its original state, as shown in FIG. 2. Once it has been opened, it can be closed again to prevent the filling material from spilling or becoming contaminated through the pouring opening. When reclosing, of course, hermetic sealing is no longer achieved, but as can be seen from the following description, the opening device can be closed again quite tightly.
  • the packaging container 10 is preferably made of a multilayer, relatively rigid sheet material, which can consist of a thick central carrier layer made of foam plastic and thin surface layers of solid plastic attached to both sides of this carrier layer.
  • the opening device according to the invention is not only applicable to packaging containers made of such a material, but also has a more general applicability.
  • the opening device 12 contains a cutout 14 produced by punching from the upper end wall 11 and having the same cover as the pouring opening 13, a cover film 15A inseparably connected to this wall section and an inner film 15B inseparably connected to the end wall 11.
  • the cover film 15A and the inner film 15B are each formed by a section of a plastic film strip 15 folded back about a transverse fold line 15C.
  • the pouring opening 13 penetrates both the end wall 11 and the inner film 15B.
  • a front free end part 15D of the inner film 15B projects slightly beyond the adjacent end wall edge 17 to form a protruding pouring edge.
  • the cover film 15A is connected to the wall cutout 14 only within an area which lies inward from the free end part 15D of the film strip 15.
  • This connection area is designated 14A in FIG. 2 and is highlighted by point shading.
  • connection-free edge zones 14C and 14D are present.
  • the punched-out wall cutout 14 and the part of the inner film 15B lying thereon can thus move resiliently in relation to the cover film 15A in these edge zones. This mobility is particularly advantageous at the edge zone 14C.
  • the inner film 15B is inseparably connected over the whole area to the upper end wall 11.
  • the part of the inner film 15B covering the wall cutout 14 is thus inseparably connected over the whole area to the wall cutout 14 and contains the point-shaded connection area 14A, in which the wall cutout 14 is inseparably connected to the cover film 15A via the inner film 15B.
  • a dashed line shows the outline 13A of the pouring opening 13 and that of the wall section 14 covering it and its outline of the area of the inner film 15B which is congruent with the wall section 14, it follows that the pouring opening 13 is located in the rear area thereof a ver narrowing 13B, the width of which is denoted by a. 2 further shows that the wall cutout 14 has a corresponding constriction and, behind this constriction, laterally projecting tabs 14E.
  • the end part 14F adjoining the flaps 14E is dovetail-shaped and has a minimum width b which is only a small amount, for example 0.5-1 mm, larger than the width a of the constriction 13B.
  • the opening device 12 In its original, hermetically sealed or sealed position, the opening device 12 provides a separable, that is to say separable, that is to say extending around the opening outline 13A and the wall cutout 14.
  • tearable connection between the cover film 15A and the inner film 15B. 2 this connection is present in a point-shaded area 16 forming a closed loop. Outside the area 16 there is therefore no connection between the cover film 15A and the inner film 15B, although the cover film lies on the inner film and completely covers it.
  • the connection in area 16 can be torn open quite easily by pulling up the cover film 15A.
  • the front end or the envelope edge 15E of the cover film 15A is folded back by 180 ° in order to form a grip tongue which makes it easier to pull up the cover film.
  • the cover edge 15E designed as a grip tongue is gripped with the fingers and pulled up and back.
  • the connection in the area 16 is gradually torn open, and at the same time the wall cutout 14 is raised in such a way that the pouring opening 13 is exposed.
  • the rear region 14B of the wall cutout 14 has moved forward away from the cover film because of the flexibly curved cover film 15A.
  • the cover film 15A is pressed forwards and downwards with one finger.
  • the end part 14F is pressed through the constriction 13B into the region of the pouring opening 13 lying behind. This can be done without damaging the end wall 11 or the wall cutout 14 because the material of the wall 11 and the wall cutout has a certain elasticity and because the width a of the constriction 13B is only slightly smaller than the width b of the end part 14F.
  • the cover film 15A is subsequently pressed down again against the end wall 11, the wall cutout 14 is moved back into the pouring opening, again assuming its original position, as shown in FIG. 3.
  • the opening device 12 is primarily intended for disposable packaging containers. It suffices, therefore, that it can withstand only a fairly small number of opening and reclosing operations before the ability of tabs 14E and end portion 14F to hold the opening device in the open position or the ability of the cutout to closely engage the edges of the pouring opening to stand fades.
  • the loop-shaped region 16, where the cover film 15A and the inner film 15B produce a tear-open connection with one another also comprises a section 16A extending over the entire film width at the fold line 15C.
  • the connection is not broken in this section.
  • the length of that part of the cover film 15A which curves when opened is therefore quite short, although the cover film desirably extends quite far over the rear part of the pouring opening. Even if the cover film is quite thin, it can have sufficient stability in this curved part.
  • connection is torn open up to the fold line 15C, there are no serious consequences because the cover film always remains inseparably connected along the fold line 15C to the inner film 15B and consequently to the end wall 11. Accordingly, it is possible to dispense with the connection in zone 16A, of course, provided that the connection in the area 16 of the cover film and the inner film extends to the fold line 15C in the area 16.
  • FIGS. 5 and 6 show two initial steps in the manufacture of the opening device 12. These steps are preferably carried out simultaneously the production of the blank from which the upper end wall 11 of the packaging container 10 is formed.
  • Such a blank which can be a section of a continuous material web, is shown in FIGS. 5 and 6 and designated 11 '.
  • the film strip 15 is placed on the surface of the wall blank 1 'in the manner shown in FIG. 5 and inseparably connected to the blank within the point-shaded area 15B'.
  • the region 15B ′ corresponds to the region which is covered by the inner film 15B in the finished opening device, with the exception of the free end 15D.
  • the wall blank 11 'and the film strip 15 are punched through the entire opening outline 13A, so that the wall cutout 14 is completely separated from the remaining part of the wall blank by the punched cut. However, the cutout 14 is retained in its original position in the blank or moved back into this position.
  • the film strip 15 is folded over by 180 ° along the fold line 15C, so that it covers the connecting region 15B 'and the end 15D. If necessary, the envelope edge 15E which later forms the grip tongue is then or simultaneously folded over. Thereafter, the connections marked in FIG. 2 by the dot-shaded regions 14A, 16 and 16A are produced between the folded-over strip section forming the cover film 15A and the already fastened strip section forming the inner film 15B. If the end 15E has not already been folded over earlier, its folding over is carried out as a final method step.
  • the wall blank 11 'with the opening device 12 which has now been completed can be placed on one end of a container body after the blank has been separated from the material web and, after the edge regions have been folded down, can be connected to the container body around the fold lines indicated by dashed lines in FIG. 5.
  • connection between the cover film 15A and the inner film 15B and between the inner film 15B and the end wall 11 are preferably produced by welding.
  • adhesive connections or other connections are also conceivable.
  • the connections which are designated as inseparable can be produced in the same way as the connection which is referred to as separable, if the first-mentioned connections can be designed by means of appropriate dimensioning or in another way to be sufficiently strong to meet the present requirements with regard to mechanical strength, which they both with normal (normally careless) handling of the packaging as well as when operating the opening device.
  • the strip 15 may of course only have a small thickness so that the total thickness of the end wall 11 and the opening device does not become too great.
  • An overall thickness that is too large is disadvantageous, in particular when stacking the wall blanks completed with opening devices 12.
  • the strip should have sufficient strength not to be easily torn off at the folding line 15C if the opening device is opened roughly.
  • the strip must at least meet hygienic requirements for food packaging. It should also be water-repellent and of course allow the necessary connections to be made.
  • the materials used in conventional opening devices such as e.g. Polyvinyl chloride. The invention can therefore generally be carried out using already existing and proven devices.
  • the opening outline that delimits the wall cutout 14 can be formed by an interrupted punch cut or a line of weakness along which or along which the end wall 11 and the inner film 15B are torn off when the cover film 15A is pulled up for the first time.
  • an opening outline formed by a line of weakness i.e. in the case of a wall which is practically sealed up to the first opening even along the wall cutout, the connection between the cover film and the inner film running around the wall cutout need not be hermetically sealed. It is sufficient if it is able to prevent dirt from entering between the foils and to hold the cover foil in the folded-down position with sufficient certainty to prevent unintentional opening.
  • the wall cutout 14 can have a shape other than that shown. If the cover film 15A is designed in such a way that it automatically remains in the open position, the support tabs 14E of the cutout 14 shown in the drawing and the constriction 13B of the pouring opening 13 can be dispensed with, as a result of which the wall cutout and the pouring opening can be given a simpler shape .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cartons (AREA)
  • Packages (AREA)
  • Making Paper Articles (AREA)
  • Closures For Containers (AREA)
EP79101099A 1978-04-17 1979-04-10 Wiederverschliessbare Öffnungsvorrichtung in einer Wand eines Verpackungsbehälters und Verfahren zu deren Herstellung Expired EP0004932B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH4092/78 1978-04-17
CH409278A CH627700A5 (de) 1978-04-17 1978-04-17 Wiederverschliessbare oeffnungsvorrichtung in einer wand eines verpackungsbehaelters, und verfahren zu deren herstellung.

Publications (3)

Publication Number Publication Date
EP0004932A2 EP0004932A2 (de) 1979-10-31
EP0004932A3 EP0004932A3 (en) 1979-11-14
EP0004932B1 true EP0004932B1 (de) 1981-08-05

Family

ID=4269673

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79101099A Expired EP0004932B1 (de) 1978-04-17 1979-04-10 Wiederverschliessbare Öffnungsvorrichtung in einer Wand eines Verpackungsbehälters und Verfahren zu deren Herstellung

Country Status (11)

Country Link
US (2) US4258876A (enrdf_load_stackoverflow)
EP (1) EP0004932B1 (enrdf_load_stackoverflow)
JP (1) JPS54140679A (enrdf_load_stackoverflow)
AT (1) AT365146B (enrdf_load_stackoverflow)
AU (1) AU535057B2 (enrdf_load_stackoverflow)
BR (1) BR7902306A (enrdf_load_stackoverflow)
CA (1) CA1106298A (enrdf_load_stackoverflow)
CH (1) CH627700A5 (enrdf_load_stackoverflow)
DE (1) DE2960555D1 (enrdf_load_stackoverflow)
ES (2) ES8102040A1 (enrdf_load_stackoverflow)
MX (1) MX148388A (enrdf_load_stackoverflow)

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Also Published As

Publication number Publication date
ES479497A0 (es) 1980-12-16
AU535057B2 (en) 1984-03-01
US4258876A (en) 1981-03-31
EP0004932A3 (en) 1979-11-14
EP0004932A2 (de) 1979-10-31
ES489116A0 (es) 1980-11-01
ES8102040A1 (es) 1980-12-16
CH627700A5 (de) 1982-01-29
BR7902306A (pt) 1979-10-23
AT365146B (de) 1981-12-10
US4464154A (en) 1984-08-07
ATA282679A (de) 1981-05-15
AU4592679A (en) 1979-10-25
MX148388A (es) 1983-04-18
ES8100202A1 (es) 1980-11-01
DE2960555D1 (en) 1981-11-05
JPS6222871B2 (enrdf_load_stackoverflow) 1987-05-20
JPS54140679A (en) 1979-11-01
CA1106298A (en) 1981-08-04

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