Pull-tab for liquid container

Abstract: A pull-tab for a liquid container (80) is designed in the form of a sheet (10). By providing a cutting line (26) in the form of a ring, leaving a connecting sector (25) on the periphery, there is formed a handle sector (15), being the portion outside said cutting line (26), and a main sector (30), being the portion inside the cutting line. By providing another cutting line (28) as a convex arc in the direction away from the connecting sector (25) on the main sector, a fastening sector (31) is formed. In this pull-tab, the main sector (30) covers the pouring mouth (83) when the connecting sector (25) is positioned near the outer periphery of the pouring mouth (83) of the liquid container (80). A sector (35) between an end of the main sector (30) opposite to the connecting sector (25) and the fastening sector (31) is bonded to the surface (81) of the liquid container (80). When the handle sector (15) is lifted up and the main sector (30) is pulled up with edges of the bonded sector (35) as a supporting axis, the fastening sector (31) is turned, and its forward end engages the surface (81) of the liquid container (80) to prevent the pull-tab returning to obstruct the pouring mouth.

Description: The present invention relates to a pull-tab for a liquid container to be attached on a pouring mouth, i.e. an opening, of the liquid container. Conventinally, a pouring mouth or an opening is provided on a liquid container, which is primarily made of paper or plastics, and the pouring mouth is attached and sealed with a pull-tab made of film-like sheet or resin. The mouth is unsealed by detaching the entire sheet or pull-tab. However, when the entire sheet or the entire pull-tab is detached, the sheet or the pull-tab is turned to another type of refuse in addition to the liquid container itself. Thus, additional problem of refuse disposal occurs when these are thrown away. To solve the problem, there have been proposed various methods, e.g. only a part of the sheet or the pull-tab is peeled off so that the sheet or the pull-tab itself is not detached from the liquid container. In this case, however, when fingers are separated from the sheet or the pull-tab, the sheet or the pull-tab returns to its initial position and blocks the pouring mouth of the container. In EP 0166483 (Barker) a container having an upstanding rim around the periphery of its top lid comprising an easy-open/reclosing element hingedly attached to the container's top lid is disclosed. However, the hinge keeps the easy-open/reclosing element in a locked-open upright position. The easy-open/reclosing element is further provided with a depending plug shaped complementary to the dispensing aperture to enable resealing of the container. It is an object of the present invention to provide a pull-tab for a liquid container, which is left on the container when the pouring mouth is unsealed and is not turned to refuse, and which does not block the pouring mouth of the container and can be produced in simple and easier manner. According to a first aspect of the present invention there is provided a pull-tab for attachment to a liquid container to seal a pouring mouth thereof comprising a portion of sheet material including a first area intended to seal a pouring mouth of the container and a second area intended to be bonded to a surface of the container in order to retain the pull-tab on the container after the first area has been peeled from the pouring mouth, such that said sheet material is provided with a cutting line bounding a portion of said sheet located between said first area and said second area and projecting away from said first area towards said second area whereby when said first area is peeled away from the pouring mouth, said projecting portion passes over centre between the pull-tab and the said surface of the container in order to retain said first area in a position away from the pouring mouth of the container, and said cutting line is V-shaped whereby said projecting portion is in the shape of a horn, where said horn is provided with a transverse line of weakness to promote folding thereof as said pull-tab is peeled from the container. According to a second aspect of the present invention there is provided a pull-tab for attachment to a liquid container to seal a pouring mouth thereof comprising a portion of sheet material including a first area intended to seal a pouring mouth of the container and a second area intended to be bonded to a surface of the container in order to retain the pull-tab on the container after the first area has been peeled from the pouring mouth, characterised in that said sheet material is provided with a cutting line bounding a portion of said sheet located between said first area and said second area and projecting away from said first area towards said second area whereby when said first area is peeled away from the pouring mouth, said projecting portion passes over centre between the pull-tab and the said surface of the container in order to retain said first area in a position away from the pouring mouth of the container, and said cutting line is substantially trapezoidal whereby said projecting portion tapers in a direction away from said first portion, wherein said projecting portion has a wider portion with laterally projecting wings at a narrower extremity thereof, where an area of said pull-tab bounding said projecting portion is provided with parallel lines of weakness (33-3) between said first and second areas to promote bending of the pull-tab. Conveniently, the sheet material in both aspects of the invention is provided with at least one further cutting line defining an outer ring pull portion bounding said first and second areas and connected to said first area at a region remote from said second area. Preferably, said ring pull portion is formed by cutting lines leaving a frangible connecting portion between the ring portion and said second area. In a third aspect of the present invention there is provided a container having a pull-tab as defined above and provided thereon with said first area forming a peelable seal of the container pouring mouth and said second area bonded to a surface of the container. According to a preferred embodiment of the invention, the pull-tab for a liquid container covers and seals a pouring mouth or opening of the liquid container made of paper or plastics, whereby said pull-tab is designed in sheet-like shape and by providing a cutting line in the form of a ring, leaving a connecting sector on the periphery, it comprises a handle sector, being the portion outside said cutting line, and a main sector, being the portion inside the cutting line. By providing another cutting shaped as a curving line or bending line, where the convex part of said cutting line pointing to the direction away from the connecting sector on the main sector, a fastening sector is formed. Further, in the pull-tab as described above, the connecting sector is positioned near outer periphery of the pouring mouth of the liquid container and covers the pouring mouth by its main sector, and the portion between an end of the main sector opposite to the connecting sector and the fastening sector is bonded to the surface of the liquid container. In the above arrangement when the handle sector is pulled up, it is lifted up with the connecting sector as a supporting point. Next, when the handle sector is pulled up further, the main sector is turned and lifted up with edges at the bonded sector as a supporting axis. Then, the pouring mouth is opened. When the main sector is lifted up to the position where it stands approximately in vertical direction, tip of the fastening sector is turned toward rear side from the surface of the main sector and is fastened on the surface of the liquid container. Therefore, even when fingers are separated from the handle sector under this condition, the main sector does not return to its initial position, and it is perfectly retained at its present position. In other words, the pull-tab is maintained in unsealed condition once unsealed, and it does not block the pouring mouth. When the pouring mouth of the liquid container is unsealed or opened, the pull-tab remains to be attached on the liquid container, and it is not turned to an additional refuse separate from the liquid container itself. This pull-tab can be produced easily by simply cutting the sheet. The invention is illustrated by way of example in the accompanying drawings, in which Figs. 1 (A), (B), (C) and (D) each represents a pull-tab for a liquid container according to a first embodiment of the present invention, where Fig. 1 (A) is a plan view, Fig. 1 (B) is a perspective view showing only the pull-tab 10, Fig. 1 (C) is a side view showing the condition when the pull-tab 10 is opened, and Figure 1 (D) is a perspective view showing only the pull-tab 10. Figs. 2 (A), (B), (C) and (D) each represent a pull-tab for a liquid container according to a second embodiment of the present invention, where Fig. 2 (A) is a plan view, Fig. 2 (B) is a perspective view showing only the pull-tab 10-3, Fig. 2 (C) is a side view showing the condition where the pull-tab 10-3 is opened, and Fig. 2 (D) is a perspective view showing only the pull-tab 10-3. Fig. 3 is a cross-sectional view showing a sealing structure of a pouring mouth 83-4. In the following, detailed description will be given on embodiments of the present invention is connection with the drawings. As shown in these figures, the pull-tab 10 is attached to cover a pouring mouth 83, which is provided on an upper plate 81 of a liquid container 80 made primarily of paper or plastics. Here, on the pouring mouth 83 of the liquid container 80, a small projection 85 is provided, which protrudes in form of a triangle facing toward outer periphery 82 of the upper plate 81. On the other hand, the pull-tab 10 is designed with a resin sheet in approximately elliptical shape. A cutting line is provided on outer periphery of the pull-tab in form of a ring (cutting line 26), leaving only a connecting sector 25 intact. Thus, it comprises a handle sector 15, i.e. the portion outside the cutting line, and a main sector 30, i.e. the portion inside the cutting line. Opposite (by 180° ) to the connecting sector 25 in the cutting line 26, a small portion is left uncut to leave a seal checking sector 27. Also, in the main sector 30, a fastening sector 31 is formed by another cutting line in shape of a convex arc in the direction away from the connecting sector 25 (cutting line 28). On each end of the fastening sector 31, a bending sector 33 is provided so that the main sector 30 can be easily bent with these two ends as an axis as shown by the dotted cutting line. The pull-tab 10 can be easily produced by two processes: a process to punch the external shape from a metal sheet and a process to provide cutting lines on pull-tab 10 by a single cutting operation. Then, the sector 35 (the sector shown by dotted diagonal lines in Fig. 1 (B)) between the end of the main sector 30 opposite to the connecting sector 25 and the fastening sector 31 is bonded to the upper plate 81 of the liquid container 80. However, sectors 36 and 36 between the bending sector 33 on each end of the fastening sector 31 and edges 35a of the bonded sector 35 are not bonded. On the other hand, as shown in Fig. 3,a thin resin film 87-4 is closely affixed to the inner surface of the liquid container 80 and to the lower surface of the pull-tab 10 facing to the pouring mouth 83. To operate the pull-tab the handle sector 15 with the seal checking section 27 on the pull-tab 10 is lifted up. Then, the seal checking section 27 is torn off, and the handle sector 15 can be lifted up with the connecting sector 25 as a supporting axis. The seal checking sector 27 is provided to demonstrate that the pull-tab 10 is not yet unsealed, and it contributes to the prevention of falsification or tampering. When the handle sector 15 is lifted up further, the main sector 30 is raised with the edges 35a and 35a of the bonded sector 35 as the supporting axis. In this case, the film 87 is peeled off in shape of the pouring mouth 83 because it is affixed on lower surface of the main sector 30, and the pouring mouth 83 is opened. When the lifting of the main sector 30 is started, the lifting force is concentrated on the small projection 85 of the pouring mouth 83. Thus, the film 87 on the small projection 85 is easily peeled off, and this facilitates the subsequent peeling of the film 87. As shown in Figs. 1 (A) and 1 (B), the fastening sector 31 is designed in such manner that its central convex portion 25a is formed in shape of a horn. In the fastening sector 31, a bending sector 37 formed by a line of weakness is provided so that the convex horn 25a of the fastening sector 31 can be easily bent. An edge 35a of a bonded sector 35 is designed on the same straight line as the bending sector 37. When the handle sector 15 of the pull-tab 10 is lifted up, the main sector 30 is raised. Further, the handle sector 15 is pulled backward as shown in Fig. 1 (C) and is stopped at the outer periphery 82 of the liquid container 80. In this case, the convex portion 25a of the fastening sector 31 is bent along the cutting line 37 and is stopped on the upper plate 81 of the liquid container 80. Thus, the main sector 30 is reliably retained at the bent position. In this embodiment, the main sector 30 can be retained at a downward position because the convex portion 25a of the fastening sector 31 is bent. Fig. 2 shows the pull-tab for a liquid container according to a second embodiment of the present invention, where Fig. 2 (A) is a plan view, Fig. 2 (B) is a perspective view showing only the pull-tab 10-3, Fig. 2 (C) is a side view showing the condition where the pull-tab 10-3 is opened, and Fig. 2 (D) is a perspective view of the condition of the pull-tab 10-3 in Fig. 2 (C). As shown in Figs. 2 (A) and (B), the fastening sector 31-3 is designed in approximately trapezoidal form and a portion with wider width 43 is formed at its top. On each end of the fastening sector 31-3, bending sectors 33-3 and 33-3 are provided in duplication consisting of dotted cutting lines so that the main sector 30-3 can be easily bent with these ends as an axis. It is also designed that the edges 35a-3 of the bonded sector 35-3 are on the same straight line as the top side of the wider portion 43-3. The handle sector 15-3 of the pull-tab 10-3 is lifted up to raise the main sector 30-3, and the handle sector 15-3 is pulled backward as shown in Fig. 2 (C) and is stopped at the outer periphery 82-3 of the liquid container 80-3. Then, the main sector 30-3 is bent along the double cutting lines 33-3 and 33-3. At the same time, the wider portion 43-3 at the forward end of the fastening sector 31-3 is stopped on the upper plate 81-3 of the liquid container 80-3. In this embodiment, the main sector 30-3 is bent along the double cutting lines 33-3 and 33-3, and the main sector 30-3 can be maintained at a downward position. Because the wider portion 43-3 is provided on the forward end of the fastening sector 31-3, the pulled-down main sector 30-3 can be reliably retained at the downward position. The structure to seal the pouring mouth is not limited to the structure of each of the above embodiments, and various other types of sealing structures as proposed in the past may be applied. For example, a cut portion 89-4 of the liquid container 80-4 may be left on the pouring mouth 83-4 as shown in Fig. 3, and a resin film 87-4 may be affixed on its lower surface and the pull-tab 10 may be attached on its upper surface. Although not shown, outer periphery of upper surface of the pouring mouth 83 of the liquid container 80 may be directly bonded on lower surface of the pull-tab. It is needless to say that various changes and modifications may be made without departing the spirit and the scope of the present invention. The above embodiments are given only for exemplary purpose and the invention should not be construed as limited to these embodiments. The scope of the present invention is as set forth in the claims attached hereto and is not confined to the description in the specification. Further, any variation or modification within the scope of the claims should be considered as falling under the scope of the present invention.

Claims: A pull-tab (10) for attachment to a liquid container to seal a pouring mouth thereof comprising a portion of sheet material including a first area (30) intended to seal a pouring mouth of the container and a second area (35) intended to be bonded to a surface of the container in order to retain the pull-tab (10) on the container after the first area (30) has been peeled from the pouring mouth, wherein said sheet material is provided with a cutting line (28) bounding a portion (31) of said sheet located between said first area (30) and said second area (35) and projecting away from said first area (30) towards said second area (35) whereby when said first area (30) is peeled away from the pouring mouth, said projecting portion (31) passes over centre between the pull-tab and the said surface of the container in order to retain said first area (30) in a position away from the pouring mouth of the container, characterised in that said cutting line (28) is V-shaped whereby said projecting portion (31) is in the shape of a horn (25a), wherein said horn (25a) is provided with a transverse line of weakness (37) to promote folding thereof as said pull-tab (10) is peeled from the container. A pull-tab (10) for attachment to a liquid container to seal a pouring mouth thereof comprising a portion of sheet material including a first area (30) intended to seal a pouring mouth of the container and a second area (35) intended to be bonded to a surface of the container in order to retain the pull-tab on the container after the first area (30) has been peeled from the pouring mouth, said sheet material is provided with a cutting line (28-3) bounding a portion (31-3) of said sheet located between said first area (30) and said second area (35) and projecting away from said first area (30) towards said second area (35) whereby when said first area (30) is peeled away from the pouring mouth, said projecting portion (31-3) passes over centre between the pull-tab and the said surface of the container in order to retain said first area (30) in a position away from the pouring mouth of the container, characterised in that said cutting line (28-3) is substantially trapezoidal whereby said projecting portion (31-3) tapers in a direction away from said first portion (30), wherein said projecting portion has a wider portion (43) with laterally projecting wings at a narrower extremity thereof, and wherein an area of said pull-tab bounding said projecting portion (31-3) is provided with parallel lines of weakness (33-3) between said first and second areas (30,35) to promote bending of the pull-tab. A pull-tab according to Claim 1 or 2, wherein said sheet material (10) is provided with at least one further cutting line (26) defining an outer ring pull portion (15) bounding said first and second areas (30,35) and connected to said first area (30) at a region (25) remote from said second area (35). A pull-tab according to Claim 3, wherein said ring pull portion (15) is formed by cutting lines (26) leaving a frangible connecting portion (27) between the ring portion (15) and said second area (35). A container having a pull-tab as claimed in any one of Claims 1-4, provided thereon with said first area (30) forming a peelable seal of the container pouring mouth and said second area (35) bonded to a surface of the container.

Inventors: KANEKO MASAMICHI, KONNO HIDETOSHI, SATOYOSHI JUNICHI, KANEKO, MASAMICHI, KONNO, HIDETOSHI, SATOYOSHI, JUNICHI
Applicants: TETRA LAVAL HOLDINGS & FINANCE, TETRA LAVAL HOLDINGS & FINANCE SA
Application year: 1995
Main classification: B65D17
IPC codes: B65D17, B65D5