Patent Application
20100116771
The present invention concerns a lightweight package comprising a container and a closure for removably closing said container, said closure having tamper-evident means.
The packages that are typically used for storing and dispensing liquids such as mineral water comprise a container with a container body and a container neck, and a closure for said container.
In the following description, and as a matter of non-limiting example, the container will be described as a bottle, intended for containing mineral water. Due to safety issues, the closure comprises a tamper-evident ring that is secured to a tamper evident flange of the bottle neck, and is detached from the rest of the closure when the latter is first removed from the bottle.
Further, the bottles are generally made from an injected preform that is heated and blown in a mould to produce the bottle that will then be filled, closed and labelled. In order to carry the preform and then blown bottle along the manufacturing, filling and closing lines of a facility, a second flange is disposed on the neck of the preform/bottle, which is located at a lower level than the tamper-evident flange.
This transportation flange is also very important to ensure a good stabilization of the bottle during the screwing or snapping/screwing operation (i.e. closing operation). In recent years, the thickness of the bottle walls has decreased to save packaging material used to make them, which results in less top load resistance of the bottles. In such conditions, when the closure is pressed and screwed on lines to close the bottle, the pressure is such that the sole bottle walls could not stand this pressure. Therefore, the screwing machines include a system that holds the neck of the bottle below the transportation flange, so that the vertical—top-down—pressure applied onto the bottle during screwing, does not deform or damage the bottle walls.
In the recent times, a trend appeared to reduce the amount of packaging material used for manufacturing containers and closures, due to increasing prices of the ground materials, as well as environmental issues.
Such an effort to reduce the amount of plastics material used resulted in injection-blown new packages being marketed, wherein the tamper-evident and transportation flanges are combined.
However, there still exist a need to provide a package of the type described above which comprises even less thermoplastic material, while allowing an injection-blowing manufacturing process.
The present invention meets the above described needs with a package comprising:
(i) a container made out of an injected preform that is blown, with a container body and a container neck comprising a container opening with an opening diameter d, a screw thread, and a flange extending outwardly and having a flange external diameter D, and
(ii) a closure adapted to be removably screwed onto the screw thread of said container neck in order to close said container opening, said closure comprising a closure top, a closure skirt and a tamper-evident ring that is attached to the lower edge of the skirt and is adapted to catch the flange of the container's neck when said closure is first screwed onto the neck, said tamper-evident ring being detachable from the skirt upon first removal of the closure from said neck,
said container having a top load resistance inferior or equal to 30 daN, characterized in that: the height h between the neck top edge and the lower part of the neck flange is such that: h≦(d/3).
According to this ratio, the neck height which is obtained is very low, while still allowing to form at least one screw thread around the portion of the neck which is located above the flange. Necessarily, the height of the corresponding closure is very small, which allows very important savings on the plastics material that is used for the bottle neck and closure, while still keeping good liquid-proof properties and tamper-evident features.
The top load resistance of the package is measured according to the following method: standardized test method for top load measurement according to ASTM D 2659-89 standard, equivalent to DIN 55440-1:99 standard. Typically, it is considered that the limit of resistance of the bottle is achieved when it flexes more than 3 mm vertically or if it collapses upon application of a vertical pressure applied downwardly from the top, the bottle being emptied, dry, and unclosed. Test is usually performed at room temperature (around 23° C.).
Preferably, the flange of the neck is adapted to receive carrying means for transportation of the preform or corresponding container (once the preform has been blown into a container) on the manufacturing lines.
Preferably, the container body has a generally ovoid or round cross-section. However, any other shape could be valid as well, eg. a generally square cross section.
Furthermore, in a highly preferred embodiment of the present invention, the external diameter D of the flange is such that: (1.3×d)≦D≦(1.5×d).
Even more preferably, the external diameter D of the flange is such that: D=1.4×d.
Advantageously, the container can be made of a thermoplastics material selected from the list of: polyethylenetherephtalate (PET), polyethylenenaphtalate (PEN), polyethylenetherephtalateglycol (PETG), high density polyethylene (PEHD), polypropylene, polycarbonate, or a mixture thereof.
Also preferably, the opening diameter d is less than 55 mm, more preferably less than 35 mm, even more preferably less than 25 mm.
The closure is preferably manufactured by injection or compression process of a thermoplastics material such as polyethylene.
Additional features and advantages of the present invention are described in, and will be apparent from, the description of the presently preferred embodiment which is set out below with reference to the drawings in which:
As shown in
The package 1 according to the present invention comprises, firstly, a container 2 made out of an injected preform (not shown in the drawing) that is blown in a mould after being heated.
The container 2 has a container body 3 with a generally round section, and a container neck 4. The neck 4 defines at its upper part a container opening 5 with an opening diameter d. The neck 4 further comprises a screw thread 6, and a flange 7 extending outwardly and having a flange external diameter D.
The package 1 comprises, secondly, a closure 8 adapted to be removably screwed onto the screw thread 6 of the container neck 4.
The said closure 8 comprises a closure top 9, a closure skirt 10 and a tamper-evident ring 11 that is attached to the lower edge of the skirt 10 and is adapted to catch the flange 7 of the container's neck 4 when said closure 8 is first screwed or snapped onto the neck 4, said tamper-evident ring 11 being detachable from the skirt 10 upon first removal of the closure 8 from said neck 4.
Finally, the closure 8 comprises a liquid-tight circular lip 12 extending downwards from the interior surface of the closure top wall 9, said lip 12 being such as to sealingly contact the internal surface of the neck 4 when the closure is screwed onto said neck, as shown in
Alternatively, the lip 12 could be replaced by a disc-shaped seal made of a foamed plastic material, or any other material suitable for sealing, for example an aluminium foil, and disposed as a double top wall adjacent the interior surface of the closure top wall (not shown in the drawing).
The container has a top load resistance inferior or equal to 20 daN, as measured by the ASTM D 2659-89 and DIN 55440-1:99 standards.
Importantly, according to the present invention, the height h between the top edge of the neck 4 and the lower part of the neck flange 7 is such that: h≦(d/3).
Furthermore, the flange 7 of the neck 4 has an external diameter D of the flange is such that: (1.3×d)≦D≦(1.5×d), and is therefore adapted to receive carrying means for transportation of the container on the manufacturing lines. Such carrying means can be for instance a pair of ring halves that are closed around the neck during transportation and form an annular support in contact with the lower surface of the flange 7 during transportation and screwing operations. Other types of carrying means may be used as well.
In the embodiment of the present invention shown in
It should be understood that various changes and modifications to the presently preferred embodiments described herein will be apparent to those skilled in the art. Such changes and modifications can be made without departing from the spirit and scope of the present invention and without diminishing its attendant advantages. It is therefore intended that such changes and modifications be covered by the appended claims.
For instance, the closure, while being adapted to be screwed and unscrewed from the screw threads of the container neck, can also be snapped onto the container neck when the container is first closed after filling. In subsequent closing operations, the consumer will have the choice to snap or screw the said closure onto the screw threads of the neck.
| Number | Date | Country | Kind |
|---|---|---|---|
| 07101873.3 | Feb 2007 | EP | regional |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/EP08/51115 | 1/30/2008 | WO | 00 | 7/28/2009 |
