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With Free Saver Delivery. Facebook Twitter Pinterest Share. Description The packaging closure is the primary interface between the product and the customer. Closures have undergone much evolution and development in recent years. The basic function of a closure is to allow easy access to a packaged product and to reclose the package, when the contents are not used fully in a single serve.

However, closures are now expected to deliver a wide variety of additional functions, such as ensuring that the package has not been opened prior to the first opening by the consumer, facilitating the dispensing of the product especially for food and pharmaceuticals and supporting the brand equity value of the product.


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This volume considers the technologies relevant to packaging closures and sealing systems, structured by types of pack. Expected to ship within 7 - 13 working days. This volume considers the technologies relevant to packaging closures and sealing systems, structured by types of pack. It is directed at packaging technologists, those involved in the design and development of packaging and those who specify or purchase packaging.

Induction Sealing

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Does this product have an incorrect or missing image? Send us a new image. Is this product missing categories? Each of the thread segments except the first can be formed with two substantially planar end surfaces that are inclined to the axis of the closure and face away from the top of the closure, that is they face in the direction that a mold core used to mold the closure was withdrawn. The first of the thread segments is preferably pointed at its end distal to its one adjacent thread segment to assist in mating the thread on the closure with a complementary thread on the end portion of a container.

The substantially planar ends of the thread segments can also be inclined to a notional radial plane of the closure extending from the longitudinal axis of the closure to the end of the respective thread segment such that the ends are inclined to the cylindrical skirt by an angle that is less than the angle that the respective notional plane makes with that skirt. To assist in the venting of any gas that may be present in the container, the spaces between the thread segments in adjacent turns of the thread can be aligned.

A groove may also be provided on the inside surface of the skirt portion of the closure extending longitudinally thereof through the aligned spaces. There also can be at the line of meeting of the first and second portions of the sealing rib, a weakened zone or annular region of weakness to assist even deformation of the second portion relative to the first as the closure is attached to a container as is described in Australian Patent No , the contents whereof are incorporated herein by reference.

In a further aspect, the present invention comprises a container having an end portion defining an opening of the container, the end portion being sealed by a closure as defined herein.

In this further aspect, the container can be a container for a carbonated beverage, a gaseous beverage, or a still beverage. The container can be formed from polyethylene terephthalate PET or co-polymers thereof. In a still further aspect, the present invention comprises a mold for forming a closure as defined herein. The mold can be used to form the closure using injection, rotary or compression moulding. The mold preferably has a cavity that defines one or more of the features of the closure as defined above.

It will be appreciated by persons skilled in the art that other suitable techniques for forming the closure could also be utilised. In yet a further aspect, the present invention comprises a method of applying a closure as defined herein to an end portion of a container, the method comprising the step of turning the closure onto the end portion of the container until the closure seals the container. The following description of a preferred embodiment of the present invention is provided as an example of the invention and is described with reference to the accompanying drawings, in which:.

One embodiment of a closure according to the present invention is depicted generally as 10 in FIGS. The closure 10 shown in FIG. Such a mold has cavity defining the features of the depicted closure. The closure 10 comprises a circular top 11 and a depending skirt The radially inner surface of the skirt 12 is provided with a screw thread that mates with a corresponding thread on the neck of a bottle 20 to which the closure 10 is attached.

While the embodiment of the closure 10 depicted in the drawings is described herein as having a screw thread, other suitable mating arrangements between the closure to the bottle 20 would be immediately apparent to a person skilled in the art. The radially outer surface of the depicted skirt 12 carries a series of fine vertical ribs The fine ribs 13 in the depicted embodiment terminate at the lower edge of the skirt 12 in a narrow circumferential rib.

A sealing rib 14 is provided on the underside of the top 11 of the closure The rib 14 is continuous and annular. Seen in cross-section, the rib 14 has two portions 15 and The first portion 15 is contiguous with the top 11 and, in the depicted embodiment, comprises a thickening of the skirt 12 adjacent the top It will be appreciated that the first portion 15 could be formed radially inward of the skirt 12 such that there is an annular space therebetween, as is depicted in FIGS. It is also conceivable that the first portion could be molded such that it was in abutment with the skirt 12 for all or some portion of its length.

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The inner surface of the first portion 15 has a first substantially cylindrical surface portion 17 and a second substantially cylindrical surface portion As depicted, the second surface portion 18 is disposed radially inwardly of the first surface portion The inner surface has an intermediate, substantially frusto-conical, region 19 where the thickness of the first portion 15 gradually increases in thickness. While a relatively gradual transition is depicted between the surface portions 17 and 18 , a relatively abrupt transition could also be provided as is depicted in FIG.

The second portion 16 of the rib 14 is frusto-conical in form and is of substantially constant thickness as it extends radially downwardly and inwardly from its outer edge which is contiguous with the lower end of the first portion While depicted as being of substantially constant thickness, it will be envisaged that the second portion 16 can taper slightly in thickness as it extends radially inwardly from its outer edge. As depicted, the upper surface of the second portion 16 can have a series of ridges As depicted in FIG.

A relatively sharp edge can be formed at the line of meeting between the first portion 15 and the second portion The sharp edge can be used to define a line of relative weakness between the two portions for a purpose that will be described later in this specification.

Bag Heat Sealer: How to Seal Plastic Bags & Poly Tubing

The underside of top 11 of the closure 10 depicted in FIGS. The nub 28 is positioned radially inwardly of the sealing rib The depicted nub 28 is continuous and has an inner surface 29 and an outer surface The nub 28 extends downwardly from the top 11 for a length substantially equal to the length of the inner surface of the first portion 15 of the sealing rib The thickness of the top 11 of the closure 10 between the outer surface 31 of the nub 28 and the inner surface of the first portion 15 of the sealing rib 14 is the same as the thickness of the top 11 inwardly of the inner surface 29 of the nub In another embodiment, the thickness of the respective regions of the top 11 could vary relative to one another.

The bottle 20 to be sealed by the closure 10 has a neck having an end portion In the depicted embodiment, the bottle 20 is a returnable polyethylene terephthalate PET bottle. Such bottles typically have a thicker end portion 40 than non-returnable PET bottles of similar capacity.

Tamper evidence in packaging to protect your products

The end portion 40 has a free end 41 , an outside cylindrical surface 42 and an inside cylindrical surface 43 , with the inside surface 43 defining a bore 43 a. The join between the free end 41 and the inside surface 43 and the join between the free end 41 and the outside surface 42 , on the bottle 20 are each smoothly curved and define, respectively, inner and outer sealing radii 44 , 45 of the end portion 40 of the bottle While the present closure 10 can seal bottles 20 having the depicted end portion 40 , it will be readily appreciated that the closure 10 can seal bottles having different end portion configurations, eg.

When the closure 10 is applied to and turned onto the end portion 40 of a bottle 20 , the free end 41 of the end portion 40 engages the sealing rib 14 and starts to push the second portion 16 relatively upwardly within the closure As the second portion 16 is pushed upwardly it bends relative to the first portion 15 along the line of weakness.

This ensures that the folding of the second portion 16 relative to the first portion 15 takes place generally evenly around the whole circumference of the rib As the closure 10 continues to be turned onto the bottle 20 , the second portion 16 is folded back towards the inner surface of the first portion At about this time, the nub 28 also starts to abut the inside surface 43 of the end portion Once the closure 10 is fully turned onto the end portion 40 , the sealing rib 14 is positioned between the end portion 40 and the underside of the top 11 of the closure As depicted, the second portion 16 has been folded, in this case, back into contact with the second cylindrical surface portion 18 of the first portion The second portion 16 , while folded back against the surface 18 , also bears against the outside surface 42 and onto the outer sealing radius 45 of the end portion With the closure 10 fully engaged on the bottle 20 , the nub 28 also exerts an outwardly directed pressure on the inside surface of the end portion Once the closure 10 is fully turned onto the end portion 40 , a seal is formed between the nub 28 and the inside surface 43 of the end portion A seal is also formed between the rib 14 and the end portion In the depicted embodiment, the seal extends from the outside surface 42 up around the outer sealing radius Depending on the capping torque, the seal may also extend across the free end 41 for a distance, such as is depicted in FIG.

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It will be appreciated that the degree of sealing engagement of the second portion 16 with the free end 41 of the end portion 40 will depend on a number of factors, including the relative length of the first and second portions, the wall thickness of the end portion 40 , and the capping torque used to turn the closure 10 onto the end portion This embodiment is identified by numeral Closure 50 is similar to the closure depicted in FIGS. Firstly, it will be noted that closure 50 is not depicted as having a nub. While not depicted in FIG. Further, the first sealing portion 15 of the sealing rib 14 is spaced inwardly from the skirt Closure 50 is also depicted as having a screw thread 55 , and a tamper evident band 56 connected to the distal edge of the skirt 12 by a number of frangible bridges This closure is depicted generally as In this embodiment, the inner surface of the first portion is comprised of inner surfaces 17 and