EP0006652A1 - Dispositif d'ouverture pour emballages - Google Patents

Dispositif d'ouverture pour emballages Download PDF

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Publication number
EP0006652A1
EP0006652A1 EP79200294A EP79200294A EP0006652A1 EP 0006652 A1 EP0006652 A1 EP 0006652A1 EP 79200294 A EP79200294 A EP 79200294A EP 79200294 A EP79200294 A EP 79200294A EP 0006652 A1 EP0006652 A1 EP 0006652A1
Authority
EP
European Patent Office
Prior art keywords
opening
packing container
thread
tearing
packing
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.)
Granted
Application number
EP79200294A
Other languages
German (de)
English (en)
Other versions
EP0006652B1 (fr
Inventor
Sven-Olof Andrén
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 Pak AB
Original Assignee
Tetra Pak AB
Tetra Pak International AB
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 Pak AB, Tetra Pak International AB filed Critical Tetra Pak AB
Publication of EP0006652A1 publication Critical patent/EP0006652A1/fr
Application granted granted Critical
Publication of EP0006652B1 publication Critical patent/EP0006652B1/fr
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
    • B65D77/00—Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks or bags
    • B65D77/22—Details
    • B65D77/30—Opening or contents-removing devices added or incorporated during filling or closing of containers
    • B65D77/32—Tearing-strings or like flexible elements

Definitions

  • the present invention relates to an opening arrangement for packing containers of the type wherein a part of the packing container wall which is openable by means of a tearing thread is limited by an opening indication line.
  • an opening arrangement in a packing container wall of paper or laminated plastic material prefferably to be formed with the help of a weakening line arranged in the wall, which extends around an openable portion.
  • a weakening line arranged in the wall, which extends around an openable portion.
  • a desirable solution consists therefore in modifying the firstmentioned opening arrangement in such a manner that the openable portion of the packing container wall can be opened without having to be pressed into the packing container and without the risk of splashing or spilling.
  • This modification can take the form of the opening arrangement being provided with a tearing thread applied along the weakening line, one end of which is accessible from the outside of the package and by means of which the connection of the openable part of the wall with the remaining packing container wall can be broken.
  • An opening arrangement comprising a tearing thread of this type functions very well but will be somewhat complicated to manufacture, since the application with sufficient accuracy of the tearing thread is time-consuming and difficult, especially when the tearing thread is to be applied along a curved opening indication line. In the mechanical, rapid manufacture of packing containers from a moving material web therefore it has not been possible up to now to apply the tearing thread with sufficient accuracy.
  • an opening arrangement for packing containers of the type wherein a part of the wall of the packing container which is openable by means of a tearing thread is delimited by an opening indication line, is given the characteristic that the opening indication line is curved or arched, that the tearing thread extends substantially rectilinearly between two points of the opening indication line, and that the tearing thread is firmly attached to the packing container wall at least at one of the said points.
  • An embodiment of the opening arrangement in accordance with the invention has been given the further characteristic that the tearing thread in packing containers which are manufactured from weblike material runs parallel with the direction of the web.
  • a further embodiment of the arrangement in accordance with the invention has been given the further characteristic that the tearing thread is fixed in a detachable manner to the surface layer of the packing container wall facing towards the inside of the package.
  • a further embodiment of the arrangement in accordance with the invention has been given the further characteristic that the opening indication line constitutes a sealing line between two wall parts forming the packing container.
  • a further embodiment of the arrangement in accordance with the invention has been given the further characteristic that the one end of the tearing thread extends through the opening indication line and is located outside the packing container.
  • a further embodiment of the arrangement in accordance with the invention has been given the further characteristic that the end of the tearing thread extending outside the packing container is connected to a part of the packing container material in the shape of a tearing tab.
  • a further embodiment of the arrangement in accordance with the invention has been given the further characteristic that the front end of the tearing thread located outside the packing container meets the opening indication line in an obtuse angle.
  • a further embodiment of the arrangement in accordance with the invention has been given the further characteristic that the openable part of the wall of the packing container is in the form of a turn-up lid which is pivotable about a straight line which extends between the end points of the opening indication line and delimits the openable lid part from an adjoining part of the packing container wall.
  • a further embodiment of the arrangement in accordance with the invention has been given the further characteristic that the said line coincides with the straight line along which the tearing thread is detachably fixed to the packing container wall.
  • the packing container shown in figure 1 is substantially of the same type as that described thoroughly in Swedish patent no. 330.505, to which reference is made.
  • the packing container is made of a laminated all-plastic material which comprises an inside layer of foamed plastic material, e.g. polystyrene, which is covered on both sides by homogeneous layers of the same material.
  • the central foamed carrier layer has a thickness of approx. 0,8 mm, whilst the two homogeneous outer layers have a thickness of only 0,1 mm.
  • the combination of a relatively thick, central foamed layer and homogeneous surface layers imparts to the material a good rigidity and makes it liquid- tight at the same time. Through the choice of a thermoplastic material it becomes possible in a simple manner to heat-seal the packing container.
  • the packing container is made of two parts, namely a semi-circular or U-shaped curved casing part 1 and a back part 2, the upper and lower end parts of which form the top part 3 and bottom part 4 of the packing container.
  • the casing part 1 and back part 2 are joined to one another by means of a heat seal 5 extending around the whole edge surface of the casing part.
  • the outer end of the top part 3 remote from the central portion 2' of the back part 2 has the shape of an openable lid 6, the boundary line of which against the remainder of the top part 3 coincides with a tearing thread 7 which is situated in the lower surface of the top part facing towards the inside of the package and runs substantially parallel with the folding line between the central portion 2' of the back part and the top part 3.
  • the tearing thread 7 passes through the seal 5 in the vicinity of its end points, and the one end of the tearing thread extends a little outside the seal where it forms a gripping tab 8, wherein the tearing thread end is attached to a projecting portion of the top part 3.
  • the tearing thread 7 extends substantially rectilinearly between two points situated symmetrically on the sealing line 5.
  • the part of the seal 5 situated between these points (which may be weakened compared with the remaining extent of the seal) serves as an opening indication line 5' along which the seal is caused to break with the help of the tearing thread 7 when the packing container is to be opened.
  • one end of the tearing thread 7 is attached to the opening tab 8, and the opposite end of the tearing thread, where it meets the opening indication line 5' is also durably attached to the packing container material.
  • the portion of the tearing thread 7 situated between the said points of attachment is either wholly free or it is also joined detachably to the surface of the packing container wall facing the inside of the package.
  • FIG 2 the packing container in accordance with figure 1 is shown after its opening.
  • the packing container according to figure 2 is otherwise identical with that shown in figure 1 and comprises a casing part 1, an elongated back part 2, the end parts of which form the top part 3 and bottom part 4.
  • the lid part 6, located at the outer end of the top part 3, is shown in open or turned-up state, the straight line which extends between end points of the opening indication line 5', that is to say, the line along which the tearing thread 7 is situated before the opening, serves as a folding line or hinge.
  • the tearing thread 7 continues to be attached with its one end to the packing container.
  • the opening tab 8 attached to the tearing thread is apparent which has been torn off the top part 3 on opening.
  • Figure 3 shows schematically the manufacture of a packing container in accordance with figures 1 and 2.
  • the casing part 1 and the back part 2 respectively of the packing container are manufactured from two separate webs which in the first place are mechanically processed and formed each for itself to be subsequently combined and attached to one another so as to form packing containers.
  • the manufacturing process which is also described in detail in Swedish patent no. 330.505 will here only be described schematically to facilitate understanding of the invention.
  • the two material webs consist as mentioned previously of a laminated material comprising a central layer of foamed plastic material which is covered on both sides with homogeneous thermoplastic material.
  • One of the webs that is to say, the web which is to form the back parts of the packing containers, is appreciably wider than the other web and is provided moreover in the vicinity of its upper edge (figure 3) with the tearing thread 7, which can be joined detachably to the homogeneous plastic layer which eventually will constitute the inside of the packing container.
  • the packing material web is converted in that certain portions (including parts of the tearing thread) are punched out along these two edges so that a line of substantially U-shaped lugs or off-cuts located opposite one another is formed along the two edges.
  • the lugs or off-cuts will subequently form the top and bottom parts of the packing containers and are situated in pairs opposite one another transversely over the material web and they are connected via intermediate portions which correspond to the actual back part 2' of the finished packing container.
  • the off-cuts are substantially of U-shape and consist thus of a portion located closest to the centre back part 2' which is delimited by substantially parallel edge lines and an end portion which is limited by a substantially semicircular edge line.
  • the semicircular edge line is broken by a projecting tearing tab 8, which extends unilaterally from the one side of the top part at even height with the tearing thread 7 running across the top part.
  • the area on the tearing tab 8 as well as the area on the opposite end or back end of the tearing thread 7 can be subjected to a warming up to softening temperature and to a compression which ensures attachment of the tearing thread ends to the material of the top part.
  • the material web which is to form the casing parts 1 of the packing containers is also taking place.
  • This material web is narrower than the material web forming the back parts and has a width which corresponds to the width of the punched-out area which is to form the actual back parts 2' of the packing container.
  • the curved casing parts 1 of the packing containers are now formed in that the packing material web is warmed up to its softening temperature, whereupon it is subjected to a mechanical shaping process during which the material web with the help of a shaping tool is pressed down into a series of continuous U-shaped recesses. Thanks to the thermoplastic characteristics of the material this shaping process can be done without any damage to the material and results in the material web being converted to a line of continuous U-shaped casing parts 1.
  • the packing containers are filled with the help of a filler pipe not shown on the drawing which, making use of the flexibility of the material, extends into the continuous line of packing containers via the interspace between the back parts 2 and the end portions of the legs of the casing parts 1.
  • the filling like the whole of the manufacturing process, occurs whilst the material webs are in continuous movement, and simultaneously with a packing container having been filled to the required extent it is also being moved past the end of the filler pipe for the pack part to be pressed against and sealed to the leg end of the casing part, so that the packing container will now be fully closed.
  • This continuous line of filled and closed packing containers is then divided whilst continuing its travel through the packing machine into individual packing containers, by means of a cutter, not shown, which by transverse cuts separates the still coherent packing containers from one another, whereupon the packing containers are ready.
  • the packing containers are manufactured from the packing laminate mentioned earlier consisting of a central layer of foamed material, e.g. polystyrene, which is covered on both sides with thin homogeneous polystyrene layers, it is suitable for use as a tearing thread a cotton thread which is impregnated with an acrylic polymer.
  • the thread should have a diameter of approx. 0,5 mm.
  • the two end parts of the thread are attached to the packing container material in that the portions which are to be joined are heated to the softening temperature of the material (approx. 235 0 C), whereupon the areas are allowed to cool under compression so that a heat-sealing takes place.
  • the part of the tearing thread located between these portions may either extend freely along the inner surface of the packing material or be joined detachably to the same, e.g. by spot heat-sealing or by a non-permanent sealing which can be achieved by carrying out the heat-sealing at a somewhat lower temperature and/or pressure.
  • the layers combined in the packing laminate bearing in mind a number of different factors, e.g. the contents for which the package is intended, the durability of the package, costs etc.
  • the manner of realization of the tearing thread too may vary in respect of shape as well as of material and it is conceivable e.g. to give the tearing thread the shape of a relatively flat and wide band. It is also possible to attach the thread ends to the packing material with the help of an additional material, e.g. a so-called hot-melt.
  • the tearing thread should be placed so that it extends substantially rectilinearly between the two points of attachment on the edge lines of the lid part and furthermore that the tearing thread extends parallel with the direction of the web which appreciably facilitates the application. It is, of course, important that the end of the tearing thread should extend outside the packing container and it has been found appropriate to join in the manner described above the end of the tearing thread to a part of the packing container material shaped as a tearing tab 8, since this appreciably facilitates the opening of the package.
  • the projecting tearing tab 8 is gripped and the tearing is started upwards or possibly obliquely outwards across the rounded edge lines of the openable lid part.
  • the tearing tab will then break and will be separated from the top part proper of the packing container whilst the front end of the tearing thread 7 connected to the tearing tab 8 commences to run along and to cut through the seal between the top part 3 and the casing part 1 serving as an opening indication line 5'.
  • the thread 7 Since the end of the tearing thread 7 located outside the packing container, owing to the rounded-off outer end of the top part meets the opening indication line 5' at an oblique angle (the angle between the projecting front end of the tearing thread and the opening indication line is obtuse and preferably amounts to between 120 and 150 o , which value has proved to give a safe control to allow a safe guiding of the thread), the thread will run in the right direction along the sealing line on opening. The tearing thread 7, if it is at all attached to the inside of the packing material, will then successively come loose and run along the whole opening indication line 5' until it is connected to the packing container only by its back end.
  • the tearing thread runs without difficulty along the opening indication line. This is also helped of course by the fairly slight attachment of the major part of the thread and the fact that the inside of the packing container material is uniform and smooth, so that there is no risk of the thread running along a straight line towards its back end.
  • the front portion of the top part serving as a lid 6 can be folded upwards so that an opening is produced through which the contents can be emptied out. Thanks to the rounded shape of the casing part the packing container is given exceptional pouring properties and even relatively sluggishly running, highly viscous contents can be poured out in a well converging jet without after- drip.
  • the packing container material Since the packing container material owing to its laminated and relatively thick build-up presents a certain resistance to bending, which can make the opening of the lid part 6 somewhat difficult, it may be advantageous in certain cases if the tearing thread 7 during the manufacture of the package is joined to the inner surface layer of the packing material by a heat-seal, since this results in a certain weakening of the inner layer along the straight line between the end points of the opening indication line along which the tearing thread is fixed. This weakening of the inner layer of the packing material facilitates the folding up of the lid part and helps to make it possible moreover to keep the lid part 6 in open position without having to retain it in this position by hand.
  • tearing thread there may be a risk of the tearing thread acting as a capillary tube and conducting contents through the seal and out to the end of the tearing thread located outside the packing container.
  • This risk can, of course, be overcome in most cases by giving the tearing thread a suitable design or impregnation, but in order to obtain absolute safety it is also possible to place the thread underneath the surface layer of the packing laminate, that is to say, between the surface layer and the carrier layer. Since in such cases the thread is applied to the carrier layer before the surface layer, the thread will be partly embedded in the surface layer when the surface layer is extruded and pressed to the carrier layer, so that its function on opening of the packing container will not be jeopardized.
  • Such a placing of the tearing thread has proved to work excellently together with e.g. the said type of laminate comprising carrier layers of plastic foam and surface layers of homogeneous polystyrene.
  • the special sealing of the end parts of the tearing thread can be wholly omitted, since the fixing of the tearing thread in the material will be sufficiently strong in order to prevent the tearing thread from being pulled loose in longitudinal direction when the opening procedure is initiated.
  • opening arrangement in accordance with the invention has been described in the foregoing in direct connection with a certain type of packing container, it is of course also possible to utilize the opening arrangement with other types of packing containers which e.g. may have a wholly different shape or be manufactured from a different material, be provided with conventional tearing indication lines in the form of weakening perforations or differ in some other manner from the preferred combination of packing container and opening arrangement shown.
  • the opening arrangement should be as specified by the invention, that it to say, that the tearing thread should extend substantially rectilinearly between two points on a non-rectilinear opening indication line and be firmly attached to the packing container wall at least at one of these points.
  • the opening arrangement in accordance with the invention will be very economical, since apart from the actual tearing thread no extra material is required.
  • the tearing tab as shown in the example described, can often be made of surplus material which otherwise would not be used.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Packages (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)
  • Bag Frames (AREA)
EP79200294A 1978-07-03 1979-06-11 Dispositif d'ouverture pour emballages Expired EP0006652B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE7807468 1978-07-03
SE7807468A SE422673B (sv) 1978-07-03 1978-07-03 Oppningsanordning for forpackningsbehallare

Publications (2)

Publication Number Publication Date
EP0006652A1 true EP0006652A1 (fr) 1980-01-09
EP0006652B1 EP0006652B1 (fr) 1982-08-25

Family

ID=20335367

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79200294A Expired EP0006652B1 (fr) 1978-07-03 1979-06-11 Dispositif d'ouverture pour emballages

Country Status (7)

Country Link
EP (1) EP0006652B1 (fr)
JP (1) JPS5538293A (fr)
AU (1) AU527310B2 (fr)
CA (1) CA1094966A (fr)
DE (1) DE2963576D1 (fr)
IT (1) IT1166893B (fr)
SE (1) SE422673B (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016072911A1 (fr) * 2014-11-03 2016-05-12 Å&R Carton Lund Aktiebolag Contenant à fonction d'affichage
WO2016126190A1 (fr) * 2015-02-05 2016-08-11 Å&R Carton Lund Aktiebolag Contenant d'emballage en carton pour matières solides en vrac
US10736468B2 (en) 2015-02-05 2020-08-11 Å&R Carton Lund Aktiebolag Packaging container with rim and lid

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0134946Y2 (fr) * 1985-03-07 1989-10-24
JP5348609B2 (ja) * 2008-11-10 2013-11-20 旭硝子株式会社 板状体の積載装置及び運搬車両

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1878677A (en) * 1930-12-03 1932-09-20 George W Curtis Container seal
SE330505B (fr) * 1969-08-13 1970-11-16 Tetra Pak Int
DE1611678A1 (de) * 1967-11-18 1972-02-03 Hans Paal Verbindungselement zur Herstellung von Klebeverbindungen
FR2332923A1 (fr) * 1975-11-25 1977-06-24 Natronag Papierprod Gmbh Sac en papier a fond en croix, comportant un systeme d'ouverture par dechirure

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5011942B1 (fr) * 1971-06-07 1975-05-08

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1878677A (en) * 1930-12-03 1932-09-20 George W Curtis Container seal
DE1611678A1 (de) * 1967-11-18 1972-02-03 Hans Paal Verbindungselement zur Herstellung von Klebeverbindungen
SE330505B (fr) * 1969-08-13 1970-11-16 Tetra Pak Int
FR2332923A1 (fr) * 1975-11-25 1977-06-24 Natronag Papierprod Gmbh Sac en papier a fond en croix, comportant un systeme d'ouverture par dechirure

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016072911A1 (fr) * 2014-11-03 2016-05-12 Å&R Carton Lund Aktiebolag Contenant à fonction d'affichage
US10370158B2 (en) 2014-11-03 2019-08-06 Å&R Carton Lund Aktiebolag Container with display function
WO2016126190A1 (fr) * 2015-02-05 2016-08-11 Å&R Carton Lund Aktiebolag Contenant d'emballage en carton pour matières solides en vrac
US10730660B2 (en) 2015-02-05 2020-08-04 Å&R Carton Lund Aktiebolag Paperboard packaging container for bulk solids
US10736468B2 (en) 2015-02-05 2020-08-11 Å&R Carton Lund Aktiebolag Packaging container with rim and lid

Also Published As

Publication number Publication date
AU4852179A (en) 1980-01-10
SE7807468L (sv) 1980-01-04
SE422673B (sv) 1982-03-22
IT1166893B (it) 1987-05-06
DE2963576D1 (en) 1982-10-21
EP0006652B1 (fr) 1982-08-25
CA1094966A (fr) 1981-02-03
AU527310B2 (en) 1983-02-24
IT7923992A0 (it) 1979-06-29
JPS5538293A (en) 1980-03-17

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