CN104470817A - Lightweight closure and container package - Google Patents

Abstract

A closure and container package for pressurized products, such as carbonated beverages, includes a closure comprising a closure cap having a top wall portion, and an annular skirt portion depending from the top wall portion. Features of the closure construction, and selection of the polymer from which the closure is formed, permits the closure to meet sealing, impact resistance, and other performance criteria, with desirably reduced use of polymeric material. Significant cost savings can thus be achieved.

Description

Lightweight closures and container packaging

technical field

The present invention relates generally to closures and container packages for carbonated beverages and the like, wherein the closures have been specifically configured to reduce the use of polymeric materials while at the same time providing the desired sealing properties for the packaged carbonated contents.

Background technique

Molded plastic closures formed from suitable polymeric materials have gained wide market acceptance. Closures of this nature, generally formed by compression molding or injection molding, have proven particularly effective for use on containers with carbonated or pressurized contents. Experience has shown that providing an effective seal for packages with carbonated contents often requires very cleverly designed closures to ensure an effective seal over temperature ranges and handling conditions. Additionally, closures of this nature typically include tamper-evident features such as tamper-indicating strips to ensure fresh quality product is consumed.

As will be appreciated, a significant cost associated with closures of this nature is the polymer material from which the closure is formed. Polypropylene, polyethylene, copolymers and similar polymers are generally used for the manufacture of closures of the type described. Given the very large number of closures typically used for any given product, any reduction in the amount of polymer material used to manufacture the closures may desirably result in a significant savings in cost.

The present invention is directed to a closure and container packaging comprising a lightweight closure that has been specifically configured to reduce the use of polymeric material, while still providing the necessary properties of the closure, including sealing properties, while at the same time providing Integrity anti-tampering function.

Contents of the invention

A closure and container package embodying the principles of the present invention has been specifically configured for carbonated products such as carbonated beverages or other pressurized products. In particular, the closure of the package has been specifically configured to require a relatively reduced amount of polymeric material, while at the same time providing the necessary sealing properties and desired tamper-indicating functionality.

According to the illustrated embodiment, a lightweight closure embodying the principles of the present invention may be configured as an integral, one-piece closure made of a polymeric material. The closure includes a closure cap having a top wall portion and an annular skirt portion depending from the top wall portion. The skirt portion includes an external knurled pattern and internal thread formations for threaded engagement with external thread formations of an associated container.

To provide the desired tamper-indicating function, the present lightweight closure includes a tamper-evident band at least partially detachably connected to the skirt portion of the closure cap. The tamper-evident band is detachably connected to the skirt portion by a plurality of circumferentially spaced frangible bridges, each frangible bridge defining a perimeter extending into the closure between the skirt portion and the tamper-evident band. Between spaced notches.

In particular, it has been found that the development of the present closures may be most cost effective using certain polymer compositions having certain densities while providing the desired level of closure performance. For this reason, the present closure assumes that it is preferably formed from a high density polyethylene polymer having a density of about 0.945 g/cm to about 0.97 g/cm. In one current embodiment, high density polyethylene having a density of 0.955 g/cm has been successfully used.

An important aspect of meeting the required performance characteristics of closures used on carbonated beverages and the like is the dimensional consistency of the closure despite variations in polymer composition. To this end, when the colorant is provided in the polymer, the composition of the polymer preferably includes a nucleating agent to thereby minimize dimensional changes of the closure. The polymer also preferably includes approximately 0.2 to 0.3% by weight lubricant.

As noted, the present closure may be configured as a unitary, one-piece construction, and to this end, preferably includes integrated sealing features for sealing engagement with an associated container. In the illustrated embodiment, the closure includes a substantially continuous annular sealing element depending from the inner top wall portion of the annular skirt portion of the closure cap. The outer sealing element is generally annular and defines a generally inwardly facing sealing surface for mating with a generally outwardly facing sealing surface of an associated container.

The sealing performance of the outer sealing element is enhanced by providing a plurality of circumferentially spaced seal enhancing elements on an inner side surface of said skirt portion radially outward of the outer sealing element and adjacent to the top wall portion. The reinforcing element is engageable with the outer sealing element to limit outward deflection of the outer sealing element, thereby increasing the sealing engagement of the outer sealing element with the associated container and improving the impact resistance of the closure.

In a preferred form, the present closure further comprises an inner plug sealing element depending from the top portion of the closure cap. The plug seal element is generally cylindrical and defines an outwardly facing sealing surface for sealing engagement with a generally inwardly facing interior surface of an associated container.

In preferred forms of the present closure, the internally threaded configuration of the closure cap is specifically configured to enhance the performance of the closure while at the same time reducing the use of polymeric material. To this end, the internal thread formation is preferably configured to provide a decreasing variation in retention force in a direction away from the top wall portion of the closure. Generally, this is achieved by providing a different thread geometry for the internal thread formation, with the top wall portion towards the closure cap having a larger cross-sectional internal thread formation to provide greater resistance.

As noted, the present closure has been specifically configured to provide a tamper-indicating function with the tamper-evident band of the closure releasably connected to the annular skirt portion of the closure cap. According to the illustrated embodiment, the tamper-evident band includes an annular band portion depending from a skirt portion, and an inner annular flange portion extending inwardly from a lower edge of the annular band portion, the annular band portion being detachably connected to the skirt part. In particular, the inner flange portion defines a plurality of circumferentially spaced openings spaced from its free edge. The tamper-evident band of the closure has been specifically configured to provide the desired tamper-indicating properties while minimizing the amount of polymeric material forming the band. In a preferred form, the tamper-evident band has a largest outer dimension that substantially matches the largest outer dimension of the skirt portion at its outer knurled portion.

In particular, it has been found that a closure embodying the principles of the present invention provides all the requisite performance characteristics in its current embodiment at a weight of about 1.95 g and has an overall light weight performance index of at least about 40.

Other features and advantages of the present invention will become apparent from the following detailed description, drawings and appended claims.

Description of drawings

Figure 1 is an exploded, partially cutaway side elevational view showing a closure and container package for carbonated products embodying the principles of the present invention;

Figure 2 is a cross-sectional view of the closure shown in Figure 1; and

Figure 3 is a cross-sectional view similar to Figure 2 showing the closure in its configuration after ejection from the associated mould, with the tamper-evident band of the closure loose and in its formed orientation.

Detailed ways

While the invention is capable of embodiments in different forms as shown in the drawings and described below in presently preferred embodiments, it is provided that this disclosure is an example of the invention and is not intended to limit the invention In the specific example shown.

Referring now to the drawings, there is shown a closure and container package 10 for carbonated or pressurized contents including a lightweight closure 12 embodying the principles of the present invention and a container 14 with a threaded neck portion that The neck portion contains an external helical thread formation 16 . The threaded formation terminates in an annular locking ring 18 which cooperates with closure 12 for tamper indication. As is well known to those skilled in the art, it may be desirable to provide closures and container packages with carbonated contents with effective sealing properties. In order to maintain carbonation over extended periods and temperature changes, the closure 12 needs to be carefully engineered to provide the desired performance. At the same time, product quality assurance requires packaging to provide a reliable indication of tampering with a closure 12 specifically configured to cooperate with an associated container to provide reliable evidence of tampering.

Regardless of said requirements, the closure must be easy to use by the consumer without requiring excessive applied torque during manipulation of the closure for effective removal from the associated container. Closures must be suitable for application to containers at high speeds with very low rates of misuse by automated capping equipment.

In this sense it is highly desirable to minimize the amount of polymeric material forming the closure. Polymer materials represent a significant portion of the cost of closures and therefore any material savings will ultimately be realized on a larger scale given the widespread application of this type of packaging for carbonated products such as carbonated drinks.

As will be further described, the closure 12 has been specifically configured to provide the necessary performance characteristics, including sealing performance, while desirably minimizing the use of polymeric material forming the closure and the costs associated therewith. The closure is specifically configured for a reliable tamper-indicating accompaniment that is partially or fully removable from an associated container, thus providing the consumer with the desired assurance of quality.

Referring further to the drawings, in the illustrated embodiment, the closure 12 includes a unitary, one-piece closure cap 12 having a top wall portion 20 and an annular skirt portion 22 depending from the top wall portion. The skirt portion 22 is provided with an internal thread formation 24 in the form of a number of thread segments which collectively define an internal thread formation. In particular, the internal thread formation 24 is preferably configured to provide a variable retention force, that is to say a retention force that decreases in a direction away from the top wall portion 20 . To this end, the thread configuration may be configured according to US Patent Publication 2012/0091138, published April 19, 2012, the disclosure of which is incorporated herein by reference. In the illustrated embodiment, this change in retention force is achieved by providing the portion of the internal thread formation 24 remote from the top wall portion 20 with a reduced thread profile, as shown. It has been desirably found that this preferred configuration of the internal thread formation 24 improves the torque removal performance of the closure.

The closure 12 is configured for cooperative sealing engagement with the closure's associated container 14 and container package 10 . In the illustrated embodiment, container 14 is shown as having a so-called "CSD finish," that is, in a configuration for carbonated soft drinks (this is sometimes designated "1881 finish").

The closure 12 is configured for rotatable threading onto and removal from the container 14 by interengagement of the internally threaded formation 24 with the externally threaded formation 16 . Convenient manipulation of the closure 12 by the consumer is facilitated by the provision of a plurality of axially extending outer grip knurls 26 on the outer surface of the skirt portion 22 .

As noted, in the illustrated embodiment of the closure 12, the closure is of unitary construction and does not include a separate sealing gasket element. While closures configured in accordance with the present invention may include this separate sealing liner, in the illustrated embodiment the closure cap is provided with integral sealing features for providing the desired sealing fit with the associated container 14 . Specifically, closure 12 includes an inner plug seal element 30 integrally depending from top wall portion 20 . The inner plug sealing element 30 is generally cylindrical and defines an outwardly facing sealing surface for sealing engagement with a generally inwardly facing inner surface of an associated container.

The sealing performance of the closure 12 is achieved by further providing an outer sealing element 32 depending from the top wall portion 20 inside the annular skirt portion 22 . Outer sealing element 32 defines a generally inwardly facing sealing surface for engaging a generally outwardly facing surface of an associated container 14 , which in the illustrated embodiment has a smaller axis than inner plug sealing element 30 . Axial dimension to dimension.

In the presently preferred embodiment, increased sealing performance to closure 12 is achieved by providing a plurality of circumferentially spaced seal enhancing elements on the inner surface of radially outward skirt portion 22 of outer seal element 32 . The reinforcing elements 34 are positioned adjacent the top wall portion 22 as individual reinforcing elements spaced circumferentially around the inside of the closure 12 . The reinforcing element may be configured in accordance with US Patent Publication 2013/0175285 and configured such that the reinforcing element is engageable by the outer sealing element 32 to limit outward deflection of the outer sealing element, thereby enhancing the sealing engagement of the outer sealing element with the associated container 14 . In addition, impact resistance is also desirably enhanced.

As noted, tamper resistance is an important capability of this type of closure, and to this end, closure 12 includes a tamper-evident band 40 at least partially detachably connected to annular skirt portion 22 . In the preferred form, tamper-evident strap 40 includes an endless strap portion 42 depending from skirt portion 22 to which the strap portion is detachably connected. The tamper-evident band also includes an annular inner flange portion 44 extending inwardly from a lower edge of the annular band portion 42 .

In the preferred embodiment, the inner flange portion 44 defines a plurality of circumferentially spaced openings or windows 46 spaced from the free edge of the inner flange portion 44 . The provision of the opening 46 desirably facilitates folding and inversion of the inner flange portion 44 from its formed orientation shown in FIG. 3 to its in-use orientation shown in FIG. 2 . It has also been found that the provision of the opening 46 desirably enhances the tamper resistance of the tamper-evident band structure and facilitates inversion or turning of the flange portion 44 from its formed orientation (FIG. 3) to the closure for use with a container. its orientation (Figure 2).

As shown, the tamper-evident band 40 has a largest outer dimension that substantially matches the largest outer dimension of the skirt portion 22 at the outer knurled pattern 26 . It has been found that this arrangement desirably spreads the load as much as possible over the length of the closure as much as possible during any side impact that may occur during transport or transfer in the closure application line. This desirably acts to reduce stress on the frangible connection between the skirt portion and the tamper-evident band, which desirably limits inadvertent breakage of the closure prior to removal by the consumer.

The tamper-evident band and skirt portion are provided by a plurality of circumferentially spaced frangible bridges 48 (see FIG. 2 ) extending between the lower edge of the skirt portion 22 and the annular band portion 42 of the tamper-evident band 40. 22 desired frangible connections. Each frangible bridge 48 is defined between the skirt portion and the circumferentially spaced apart score 50 extending into the closure between the tamper-evident band. In the preferred practice of the invention, the score 50 is formed by using an intermittent scoring knife, which has been found to be desirably There is little stress concentration on the edges perpendicular to the load applied to the closure. As is sometimes applied, it has been found that partially cutting the frangible bridge creates stress concentrations along the line of orientation of the total load experienced by the closure. Thus, using an intermittent knife scoring process results in the closure being able to absorb more load without the strap detaching from the skirt portion of the closure. This construction method is preferred in the context of producing a closure that is as light as possible, since the tamper-evident strip has relatively low strength. For lower strip strengths, the frangible bridge must be weaker in the longitudinal direction in order for the strip to still break completely during removal of the closure by the consumer. The reduced stress concentrations and direction of loading allow the bridge to be weakened longitudinally while still being sufficiently strong in the transverse direction.

An aspect of the lightweight closure obtained according to the invention has been the choice of the polymer material forming the closure. In the preferred embodiment, closure 12 is formed from a high density polyethylene polymer having a density in the range of about 0.945 g/cm to about 0.97 g/cm. In the current example, the polymer designated 1250 (DMDA-1250 or DMDC-1250), available from Dow Chemicals, has a density of 0.955 g/cm, and the polymer formulated contains about 0.2 to 0.3% lubricant (eg, erucamide). In a typical formulation, the polymer comprises a letdown ratio of colorant in combination with a letdown ratio of 0.6-1.6 weight percent nucleating agent masterbatch in the range of 0.5 to 2.0 weight percent (actual nucleating agent parts per million: 300 to 800), which desirably reduces and minimizes the dimensional change of the closure as may occur with polymers with colorance.

A nucleating agent is a commercially available additive that seeds the material with sites for crystallization (eg charged calcium carbonate). Different colorants nucleate differently so that the nucleating agent overcomes the action of the colorant and the material crystallizes immediately, and therefore changes little once the closure is ejected from the tool. The end result is a larger closure with less dimensional variation within and between the colors. It has been found that this desirably results in reduced variation in removal torque performance between different colorants.

As noted, the illustrated embodiment of the closure 12 has been configured to industry standard container finishes. In the present embodiment of the closure, the closure is configured as a 28mm closure for carbonated soft drink bottle finishes (sometimes referred to as 1881 finishes). In the illustrated embodiment, the closure 12 includes a top wall portion 20 having a nominal thickness of 0.040 inches and a nominal skirt portion of 0.035 inches in thickness at the root of the thread formation. In this embodiment, the height of the closure from top wall portion 22 to score 50 has a nominal dimension of 0.466 inches, with a tamper-evident band 40 having a nominal dimension of 0.134 inches. In particular, closures configured according to the dimensions described herein above have a weight of no more than about 1.95g. In particular, this is very close to commercially available closures having weights in the range of 2.2g to 2.45g, while the closure still meets performance criteria for sealing and impact resistance. In this regard, the closure preferably exhibits an overall lightweight performance index of at least about 40, a seal index of greater than about 1.3, and a torque of removal index of greater than about 15, as discussed below.

Performance of the present closures and container packages, including sealing performance for carbonated soft drinks, can be evaluated according to the testing protocol set forth in U.S. Patent Publication 2011/0024423, published February 3, 2011, the disclosure of which is incorporated by reference incorporated into this article.

As noted above, one aspect of the present invention, including the lightweight closure of the package, achieves desired performance characteristics, including carbonation retention, while minimizing the amount of polymeric material forming the closure. To this end, it is contemplated that a closure and container package embodying the present invention exhibit an overall lightweight performance index (ALPI) of at least about 40.

ALPI is calculated from a property index consisting of a sealing index (SI) and a removal torque index (STI). To calculate ALPI, the sealing index is multiplied by a factor of twenty (20) and combined with the removal moment index (which reflects the relative importance of the sealing index).

The seal index of a closure can be determined according to industry protocols and the performance tests set forth in U.S. Patent Publication 2011/00224423, where the seal index is equal to the sum of (average volume of CO2 held/initial fill volume)/total closure mass, in After 2 weeks of conditioning at 100 degrees Fahrenheit (F), at initially carbonated 4.2, 4.5 and 4.7 volumes. Carbonated volume is the amount of CO2 absorbed by water at atmospheric pressure and 60 degrees Fahrenheit.

The removal torque index equals the average removal torque/total closure mass, conditioned at 100 degrees Fahrenheit for 24 hours.

The comparative data set forth in Table 1 below shows the combination of performance criteria provided by the present closures to exhibit an ALPI of at least about 40. In the current embodiment of the invention, the OmniMiniXP was referenced to comparative data, using the measured seal index and removal torque index to calculate an ALPI of at least about 40, specifically 42.24. It was noted that this level of performance, taking into account the weight of the closure, significantly exceeded the determined performance level of comparative, commercially available closures.

Table 1

sealing index

Remove Moment Index

           

initial filling volume

quality closure average removal torque STI value

1.9 OmniMiniXP 30.3 15.95 2.451 UCL Flex Grip 31.2 12.73 2.2 UCL Sylon 25.8 11.73 2.43 Bericap 24.4 10.04

ALPI

initial filling volume

quality closure

1.9 OmniMiniXP 42.24 2.451 UCL Flex Grip 33.18 2.2 UCL Sylon 34.44 2.43 Bericap 30.73

In conjunction with these performance criteria, it is presently preferred to configure closures to include a single lead thread configuration for use on 28mm closure finishes (but not necessarily 1881 finishes). The use of polymers in a specified density range (from about 0.9 g/cc to about 0.97 g/cm, and more preferably from about 0.945 g/cm to about 0.97 g/cm) generally precludes the possibility of exhibiting high density / high modulus high cost polymer. The performance standard contemplates using a bottle or container of specified material, wall thickness and likely volume representative of bottles currently present in the art.

test protocol

Remove torque

Purpose

Determines the closure's resistance to removal on the finished product when turned in the wrong direction.

Test Equipment

SecurePak Model 50MRA or TMS5000 Spring Torque Tester or equivalent (computer interface models are still available)

Environmental chamber capable of heating test samples to 38±1°C (100±2°F)

Manual chucks for closures sized to cover approximately 50% of closure height, or equivalent

process

1. Randomly choose 12 executions or fill and cap 12 bottles

2. Condition the sample according to the following chart:

Closure Type Condition Adjustment

temperature

state adjustment time

Aluminum ROPP No state regulation necessary

All others at 38±1°C (100±2°F) for 24 hours

If the sample has been hot filled, no conditioning is required and proceed to the next step when the sample has cooled to 38±1°C (100±2°F).

3. Place the sample in the torque meter. If the sample is conditioned or hot filled, it is not allowed to cool below 38 ± 1°C before testing.

4. Using the hand chuck, slowly turn the closure clockwise at a steady rate of 2.3 kg-cm (2 in-lbs) per second until the closure can be felt to "jump" to the finished threads.

5. Record the removal torque value.

6. Repeat the process on the remaining samples.

TM-2.13: Drop Test: Closures

Purpose

To ensure the plastic closure will not come loose if the bottle is accidentally dropped.

process flow diagram

Pressurized, Unpressurized & Hot Filled Plastic CSDs

1. Apply a plastic closure to a PET bottle containing carbonated water with a gas volume of 4.2 ± 0.1 CO2

2. Condition the bottle at 4°C±1°C (39±2°F) for at least 16 hours

3. Drop the first set of bottles vertically from a height of 1.8 meters (72”) to the base and drop the second set of bottles horizontally from a height of 1.8 meters (72”)

4. Observe for any breakage of the closure loosening and leaking

operating principle

During normal handling, there is a chance that the package (bottle and closure together) will fall. It is essential that the closure remains on the bottle during and after any such impact. This test simulates a possible drop impact.

equipment

- equipment or chemical reagents filled with carbonic acid to a gas volume of 4.20 ± 0.10 CO2

- Equipment pressurized to 25 psig maximum with nitrogen

Closure application equipment (i.e., Alcoa's single head capper or equivalent; Vibrac torque gauge in application mode, etc.)

-Temperature control chamber set to 4°C (39°F) +/- 1°C (2°F)

Drop reed impact tester with impact surface of 2' x 2' (minimum area) 0.5" flat steel plate in intimate contact with concrete floor

-Plastic safety shield around impact surface

A plastic bottle with a suitable finish (use the largest commonly sold size, i.e. 1 L or 2 L for plastic CSD closures, and i.e. 20 fl.oz./600ml for NCB pressurized and non-pressurized plastic closures)

Hot fill device (Mokon model #310242 or equivalent) with temperature capability of 83° +/- 1°C (180° to 183°F)

-safety glasses

- Heat protective gloves or equivalent

Reagents/Chemicals

not applicable

calibration

not applicable

test frequency

24 vials

Testing process

1) Fill the sample PET bottle with the nominal content:

a) Plastic CSDs :

Fill with carbonated water at a CO2 level of 4.20 +/- 0.10 gas volume and immediately cap.

2) Place the sample in a room at 4°C (39°F) +/- 1°C (2°F) for at least 16 hours.

3) a) Plastic CSD :

After the conditioning period, the samples were removed one at a time and the bottles were dropped from a height of 1.8 meters (72") (measured from the top of the swinging reed plate in the ready-to-drop position) according to: First set of samples falls vertically to the bottom of the bottle

4) Observe and record any breakage (closure not remaining on finished product following initial impact). Also, watch for any closures that leaked with the initial impact. Key codes for destruction type and location

1. No destruction

2. Bottle spills/cracks

3. Parts come loose

4. Closure release

5. Closure cracks

calculate

not applicable

record keeping

Amount of test sample.

The number of samples that failed (with failure mode and storage condition and drop direction) was reported for each temperature and impact mode.

Record all data.

From the foregoing, it will be observed that many modifications and variations can be made without departing from the true spirit and scope of the novel concept of the present invention. It should be understood that no limitations to the particular embodiments illustrated herein are intended or inferred. It is intended by this disclosure to cover by the appended claims all such modifications as fall within the scope of the claims.

Claims (20)

1. a light weight closure member, comprising:

Closure cover, its ring-shaped skirt part that there is top wall portion and dangle from described top wall portion,

Described skirt portion comprises outer knurled pattern and constructs for constructing with the outside thread of associated container the negative thread be threadedly engaged; And

Be connected to the tamper band of described skirt portion at least partly removably, described tamper band is connected to described skirt portion removably by many circumferences isolated frangibility bridging part, each in described bridging part is limited between indentation, this is nicked between described skirt portion and described tamper band and extends into described closure member

Described closure member is formed by high density polyethylene polyethylene polymers, this high density polyethylene polyethylene polymers have about 0.945 gram/cc to about 0.97 gram/cc density and have at least about 40 overall light weight performance index.

2. a light weight closure member according to claim 1, comprising:

From the outer seal component of the described top wall portion inside pendency of described ring-shaped skirt part, described outer seal component be general toroidal and limit roughly towards interior sealing surface for roughly the engaging towards outer sealing surface of described container.

3. a light weight closure member according to claim 2, comprising:

Described outer seal component is radially outer and the isolated sealing of many circumferences on the inner surface of the described skirt portion of contiguous described top wall portion strengthens element, described enhancing element can by described outer seal component engage to limit described outer seal component to extrinsic deflection, strengthen being sealed and matched of described outer seal component and associated container.

4. the light weight closure member for container according to claim 1, comprising:

From the plug-in packing element that described top wall portion is dangled, described plug packing element be substantial cylindrical and limit for associated container roughly towards interior inside face sealed engagement towards outer sealing surface.

5. the light weight closure member for container according to claim 1, wherein:

Described poly-mer is comprising toner and nucleating agent.

6. the light weight closure member for container according to claim 1, wherein:

Described closure member is weighed and is no more than about 1.95 grams.

7. the light weight closure member for container according to claim 1, wherein:

Described poly-mer comprises the lubricant of by weight about 0.2 to 0.3%.

8. the light weight closure member for container according to claim 1, wherein:

Described tamper band comprises the looped strap portions dangled from the described skirt portion be connected to removably it and the ring-shaped inner part flange portion extended internally from the lower edge of described looped strap portions, and described inner flange part limits the isolated opening of isolated many circumferences with its free edge.

9. the light weight closure member for container according to claim 1, wherein

Described negative thread structure is configured to the change providing the confining force aspect reduced along the direction away from described top wall portion.

10. a light weight closure member, comprising:

Closure cover, its ring-shaped skirt part that there is top wall portion and dangle from described top wall portion,

Described skirt portion comprises outer knurled pattern and constructs for constructing with the outside thread of associated container the negative thread be threadedly engaged; And

Be connected to the tamper band of described skirt portion at least partly removably, described tamper band is connected to described skirt portion removably by many circumferences isolated frangibility bridging part, each in described bridging part is limited between indentation, this is nicked between described skirt portion and described tamper band and extends into described closure member

Described closure member is formed by high density polyethylene polyethylene polymers, and this high density polyethylene polyethylene polymers has the density of about 0.945 gram/cc to about 0.97 gram/cc and has the sealing index being greater than about 1.3.

11. 1 kinds of light weight closure members, comprising:

Closure cover, its ring-shaped skirt part that there is top wall portion and dangle from described top wall portion,

Described skirt portion comprises outer knurled pattern and constructs for constructing with the outside thread of associated container the negative thread be threadedly engaged; And

Be connected to the tamper band of described skirt portion at least partly removably, described tamper band is connected to described skirt portion removably by many circumferences isolated frangibility bridging part, each in described bridging part is limited between indentation, this is nicked between described skirt portion and described tamper band and extends into described closure member

Described closure member is formed by high density polyethylene polyethylene polymers, and this high density polyethylene polyethylene polymers has the density of about 0.945 gram/cc to about 0.97 gram/cc and has the removal moment values being greater than about 15.

12. 1 kinds of light weight closure members, comprising:

Closure cover, its ring-shaped skirt part that there is top wall portion and dangle from described top wall portion,

Described skirt portion comprises outer knurled pattern and constructs for constructing with the outside thread of associated container the negative thread be threadedly engaged,

Described negative thread structure is configured to the change providing the confining force aspect reduced along the direction away from described top wall portion,

From the outer seal component of the described top wall portion inside pendency of described ring-shaped skirt part, described outer seal component be general toroidal and limit roughly towards interior sealing surface for roughly the engaging towards outer sealing surface of described container; And

Be connected to the tamper band of described skirt portion at least partly removably, described tamper band is connected to described skirt portion removably by many circumferences isolated frangibility bridging part, each in described bridging part is limited between circumferential isolated indentation, this is nicked between described skirt portion and described tamper band and extends into described closure member

Described closure member is formed by the high density polyethylene polyethylene polymers of the density with about 0.945 gram/cc to about 0.97 gram/cc, and described poly-mer is comprising toner and the nucleating agent making the change in size of described closure member minimum.

13. 1 kinds of light weight closure members according to claim 12, comprise

Described outer seal component is radially outer and the isolated sealing of many circumferences on the inner surface of the described skirt portion of contiguous described top wall portion strengthens element, described enhancing element can by described outer seal component engage to limit described outer seal component to extrinsic deflection, strengthen being sealed and matched of described outer seal component and associated container, and

14. 1 kinds of light weight closure members according to claim 12, comprise

From the outer seal component of the described top wall portion inside pendency of described ring-shaped skirt part, described outer seal component be general toroidal and limit roughly towards interior sealing surface for roughly the engaging towards outer sealing surface of described container, and

From the plug-in packing element that described top wall portion is dangled, described plug packing element be substantial cylindrical and limit for associated container roughly towards interior inside face sealed engagement towards outer sealing surface.

15. 1 kinds of light weight closure members according to claim 12, wherein

Described tamper band comprises the looped strap portions dangled from the described skirt portion be connected to removably it and the ring-shaped inner part flange portion extended internally from the lower edge of described looped strap portions, and described inner flange part limits the isolated opening of isolated many circumferences with its free edge.

16. 1 kinds of light weight closure members according to claim 12, comprise

From the plug-in packing element that described top wall portion is dangled, described plug packing element be substantial cylindrical and limit for associated container roughly towards interior inside face sealed engagement towards outer sealing surface.

17. 1 kinds of packagings, comprising:

There is the container filling carbonic acid content; And

Light weight closure member, comprises the closure cover formed by poly-mer, and the ring-shaped skirt part that there is top wall portion and dangle from described top wall portion,

Described skirt portion comprises outer knurled pattern and constructs for constructing with the outside thread of associated container the negative thread be threadedly engaged; And

Be connected to the tamper band of described skirt portion at least partly removably, described tamper band is connected to described skirt portion removably by many circumferences isolated frangibility bridging part, each in described bridging part is limited between indentation, this is nicked between described skirt portion and described tamper band and extends into described closure member

From the outer seal component of the described top wall portion inside pendency of described ring-shaped skirt part, described outer seal component be general toroidal and limit roughly towards interior sealing surface for roughly the engaging towards outer sealing surface of described container, and

From the plug-in packing element that described top wall portion is dangled, described plug packing element be substantial cylindrical and limit for associated container roughly towards interior inside face sealed engagement towards outer sealing surface,

Wherein said closure member has the overall light weight performance index of weight and at least about 40 being no more than about 1.95 grams.

18. 1 kinds of packagings according to claim 17, wherein

Described poly-mer comprises lubricant, colorant and the nucleating agent that makes the change in size of described closure member minimum of by weight about 0.2 to 0.3%.

19. 1 kinds of packagings according to claim 17, wherein

Described closure member is formed by high density polyethylene polyethylene polymers, this high density polyethylene polyethylene polymers has the density of about 0.945 gram/cc to about 0.97 gram/cc, and described poly-mer is comprising toner and the nucleating agent making the change in size of described closure member minimum.

20. 1 kinds of packagings according to claim 17, comprise

Described outer seal component is radially outer and the isolated sealing of many circumferences on the inner surface of the described skirt portion of contiguous described top wall portion strengthens element, described enhancing element can by described outer seal component engage to limit described outer seal component to extrinsic deflection, strengthen being sealed and matched of described outer seal component and associated container.