EP3275801B1 - Lid assembly for resin container - Google Patents
Lid assembly for resin container Download PDFInfo
- Publication number
- EP3275801B1 EP3275801B1 EP15886299.5A EP15886299A EP3275801B1 EP 3275801 B1 EP3275801 B1 EP 3275801B1 EP 15886299 A EP15886299 A EP 15886299A EP 3275801 B1 EP3275801 B1 EP 3275801B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cap
- projections
- mouth part
- lid assembly
- single thread
- 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.)
- Active
Links
- 229920005989 resin Polymers 0.000 title claims description 18
- 239000011347 resin Substances 0.000 title claims description 18
- 238000007789 sealing Methods 0.000 claims description 2
- 239000007788 liquid Substances 0.000 description 6
- 235000013361 beverage Nutrition 0.000 description 4
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 4
- 235000014171 carbonated beverage Nutrition 0.000 description 3
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 244000269722 Thea sinensis Species 0.000 description 1
- 244000299461 Theobroma cacao Species 0.000 description 1
- 235000009470 Theobroma cacao Nutrition 0.000 description 1
- 235000013334 alcoholic beverage Nutrition 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000000071 blow moulding Methods 0.000 description 1
- 235000016213 coffee Nutrition 0.000 description 1
- 235000013353 coffee beverage Nutrition 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 235000015203 fruit juice Nutrition 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 235000015067 sauces Nutrition 0.000 description 1
- 235000014347 soups Nutrition 0.000 description 1
- 235000013555 soy sauce Nutrition 0.000 description 1
- 235000013616 tea Nutrition 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
Images
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
- B65D41/00—Caps, e.g. crown caps or crown seals, i.e. members having parts arranged for engagement with the external periphery of a neck or wall defining a pouring opening or discharge aperture; Protective cap-like covers for closure members, e.g. decorative covers of metal foil or paper
- B65D41/02—Caps or cap-like covers without lines of weakness, tearing strips, tags, or like opening or removal devices
- B65D41/04—Threaded or like caps or cap-like covers secured by rotation
- B65D41/0407—Threaded or like caps or cap-like covers secured by rotation with integral sealing means
- B65D41/0414—Threaded or like caps or cap-like covers secured by rotation with integral sealing means formed by a plug, collar, flange, rib or the like contacting the internal surface of a container neck
- B65D41/0421—Threaded or like caps or cap-like covers secured by rotation with integral sealing means formed by a plug, collar, flange, rib or the like contacting the internal surface of a container neck and combined with integral sealing means contacting other surfaces of a container neck
-
- 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
- B65D41/00—Caps, e.g. crown caps or crown seals, i.e. members having parts arranged for engagement with the external periphery of a neck or wall defining a pouring opening or discharge aperture; Protective cap-like covers for closure members, e.g. decorative covers of metal foil or paper
- B65D41/02—Caps or cap-like covers without lines of weakness, tearing strips, tags, or like opening or removal devices
- B65D41/04—Threaded or like caps or cap-like covers secured by rotation
-
- 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
- B65D41/00—Caps, e.g. crown caps or crown seals, i.e. members having parts arranged for engagement with the external periphery of a neck or wall defining a pouring opening or discharge aperture; Protective cap-like covers for closure members, e.g. decorative covers of metal foil or paper
- B65D41/02—Caps or cap-like covers without lines of weakness, tearing strips, tags, or like opening or removal devices
- B65D41/04—Threaded or like caps or cap-like covers secured by rotation
- B65D41/0471—Threaded or like caps or cap-like covers secured by rotation with means for positioning the cap on the container, or for limiting the movement of the cap, or for preventing accidental loosening of the cap
-
- 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
- B65D51/00—Closures not otherwise provided for
- B65D51/16—Closures not otherwise provided for with means for venting air or gas
- B65D51/1633—Closures not otherwise provided for with means for venting air or gas whereby venting occurs by automatic opening of the closure, container or other element
- B65D51/1661—Closures not otherwise provided for with means for venting air or gas whereby venting occurs by automatic opening of the closure, container or other element by means of a passage for the escape of gas between the closure and the lip of the container mouth
Definitions
- the present invention relates to a lid assembly for a resin container including a mouth part with a male screw provided in its outer circumferential face, and a cap with a female screw provided in its inner circumferential face, the female screw having a plurality of projections that intermittently continue in a circumferential direction, in which the male screw has a single thread portion formed at least in part of a circumference of the screw where only one thread runs between a distal end and a proximal end of the mouth part, and the female screw of the cap is engaged with the male screw of the mouth part to screw the cap to seal the mouth part.
- the liquid thermally expands and then loses carbonic acid to increase inner pressure of the container.
- the male screw provided in the mouth part engages with the female screw provided in the cap to prevent the female screw positioned under the male screw from being pushed up, which in turn prevents the top of the cap from being pushed up.
- the resin container is maintained in a sealed state to prevent loss of carbonic acid.
- US 2009/045158 A1 describes an internally threaded plastic closure including an array of axially extending, circumferentially spaced internal ribs which intersect the internal thread formation of the closure.
- the inventors have found that the arrangement including the single thread portion formed in part of the circumference of the male screw where only one thread runs between the distal end and the proximal end of the mouth part decreases a force of preventing the female screw from being pushed up in the single thread portion.
- the increase in inner pressure of the resin container might break the sealed state and lead to loss of carbonic acid.
- a design change in the mouth part may be suggested so that the single thread portion may not be present.
- Such a change should be accompanied by a design change in the cap as well.
- increasing the number of threads might cause other disadvantages such as increasing the height of the mouth part or resulting in special specifications that do not meet the standards of the general-purpose mouth part.
- An object of the present invention is to provide a lid assembly for a resin container for desirably maintaining a sealed state of the resin container only by changing a design of a cap.
- a lid assembly for a resin container includes a mouth part with a male screw provided in its outer circumferential face, and a cap with a female screw provided in its inner circumferential face.
- the female screw has a plurality of projections that intermittently continue in a circumferential direction.
- the male screw has a single thread portion formed at least in part of a circumference of the screw where only one thread runs between a distal end and a proximal end of the mouth part.
- the female screw of the cap is engaged with the male screw of the mouth part to screw the cap to seal the mouth part.
- the projections include extended projections to be located under the single thread portion of the male screw. Each of the extended projections has a circumferential length greater than a circumferential length of the other projections.
- the above arrangement in which the projection located under the single thread portion has a circumferential length greater than a circumferential length of the other projections prevents the female screw from being pushed up and eventually prevents a top of the cap from being pushed up. Therefore, such an arrangement can desirably maintain the sealed state of the resin container only by changing the design of the cap.
- the extended projections are located under the single thread portion over the range covering from a maximum screwed position in which the cap is screwed to the mouth part to a maximum amount, to a minimum screwed position in which the cap is screwed to the mouth part to a minimum amount required to seal the mouth part.
- the cap is not necessarily screwed to the mouth part to the maximum amount (maximum screwed position) but is only required to be screwed to the minimum necessary amount (minimum screwed position).
- the mount part can be sealed tight by screwing the cap to any position between the maximum screwed position and the minimum screwed position.
- the extended projections are located under the single thread portion over the range covering from the maximum screwed position to the minimum screwed position, which allows the extended projections to be located under the single thread portion in any position between the maximum screwed position and the minimum screwed position.
- the female screw is prevented more accurately from being pushed up.
- the extended projections project from the inner circumferential face of the cap more outward than the other projections.
- Such an arrangement allows the extend projection to come into contact with the single thread portion with a wider area, and thus can further prevent the female screw from being pushed up and eventually prevent the top of the cap from being pushed up.
- the extended projections have an angular edge portion.
- Providing the extended projections with the angular edge portion allows the extended projections to engage with the single thread portion more firmly. Such an arrangement can further prevent the female screw from being pushed up and eventually prevent the top of the cap from being pushed up.
- a rib is provided at least in a portion of the cap corresponding to the single thread portion for connecting an outer seal provided in the cap to the inner circumferential face of the cap, the outer seal sealing the outer circumferential face of the mouth part.
- the top of the cap is pushed up because it has been expanded and deformed.
- the above arrangement provides the rib between the outer seal and the inner circumferential face of the cap.
- the rib can prevent the top of the cap from expanding and deforming in the portion corresponding to the single thread portion, which can further prevent the top of the cap from being pushed up.
- the lid assembly S for a resin container includes a mouth part 10 having a male screw 12 provided in its outer circumferential face 11, and a cap 20 having a female screw 22 provided in its inner circumferential face 21.
- the female screw 22 includes a plurality of projections 23 that intermittently continue in a circumferential direction.
- the male screw 12 has a single thread portion 13a formed at least in part of the circumference of the screw where only one thread runs between a distal end and a proximal end of the mouth part 10.
- the female screw 22 of the cap 20 is engaged with the male screw 12 of the mouth part 10 to screw the cap 20 to seal the mouth part 10 tight.
- the projections 23 include extended projections 24 and 25 to be located under the single thread portion 13a of the male screw 12.
- Each of the extended projections 24 and 25 has a circumferential length greater than a circumferential length of the other projections 23.
- the lid assembly S includes the mouth part 10 and the cap 20 attached to the mouth part 10.
- the mouth part 10 has the male screw 12 provided in its outer circumferential face 11
- the cap 20 has the female screw 22 provided in its inner circumferential face 21.
- the female screw 22 of the cap 20 is engaged with the male screw 12 of the mouth part 10 to screw the cap 20 to seal the mouth part 10 tight.
- the bottle 1 may be made of a primary component of thermoplastic resin such as polyethylene, polypropylene, and polyethyleneterephthalate to be integrally molded by stretch molding such as biaxial stretch blow molding.
- the capacity of the bottle 1 may unlimitedly range from 200 milliliters to 2 liters, which are commonly distributed.
- a liquid filling the bottle 1 is not limited and may be drinkables such as drinking water, tea, fruit juice, coffee, cocoa, refreshing beverages, alcoholic beverages, lactic beverages and soup, or liquid flavoring such as sauce and soy sauce.
- the lid assembly 1 according to the current embodiment is particularly preferable when applied to the bottle 1 filled with a carbonated beverage, which may particularly increase inner pressure of the bottle 1 when the bottle 1 is stored at high atmosphere temperature to thermally expand the liquid and cause loss of carbonic acid.
- Other beverages than the carbonated beverage may also increase the inner pressure of the bottle 1 by thermal expansion of the content, and thus the lid assembly 1 according to the current embodiment may be preferably used for noncarbonated beverages as well.
- the male screw 12 of the mouth part 10 includes threads 13 that radially project from its outer circumferential face 11 (in a direction normal to the outer circumferential face 11) and intermittently continue spirally in the circumferential direction.
- the male screw 12 has the single thread portion 13a formed at least in part of the circumference of the screw where only one thread runs between the distal end and the proximal end of the mouth part 10.
- the plurality of projections 23 formed in the female screw 22 of the cap 20 run intermittently continuously in the circumferential direction.
- the male screw 12 (threads 13) and the female screw 22 (projections 23) complement each other so that each of the threads 13 of the male screw 12 may be fitted to a gap defined by two vertically adjacent projections 23.
- the projections 23 of the male screw 22 includes the extended projections 24 and 25 continuously provided and having a circumferential length greater than a circumferential length of the remaining projections 23.
- Those extended projections 24 and 25 are configured to be positioned under the single thread portion 13a of the male screw 12 (adjacent to the proximal end of the mouth part 10) when the cap 20 is screwed to seal the mouth part 10 tight.
- the cap 20 is not necessarily screwed to the mouth part 10 to a maximum amount (maximum screwed position) but is only required to be screwed to a minimum necessary amount (minimum screwed position).
- the mount part 10 can be sealed tight by screwing the cap to any position between the maximum screwed position and the minimum screwed position.
- a difference in screw amount between the maximum screwed position and the minimum screwed position corresponds to a length of an arc of a circle with its central angle of 35 degrees when the outer circumferential face 11 of the mouth part 10 is defined as a circumference of the circle.
- each of the extended projections 24 and 25 is designed to have a length corresponding to the length of the arc of the circle with its central angle of 35 degrees when the outer circumferential face 11 of the mouth part 10 is defined as the circumference of the circle. More particularly, the extended projections 24 and 25 are provided within a range of an arc with its central angle of 70 degrees. While the extended projection 24 is located under the single thread portion 13a in the maximum screwed position (see Fig. 3 ), the extended projection 25 is located under the single thread portion 13a in the minimum screwed position (see Fig. 4 ). In a screwed position between the maximum screwed position and the minimum screwed position (see Fig.
- both the extended projections 24 and 25 are located under the single thread portion 13a.
- the extended projection 24 and/or the extended projection 25 is located under the single thread portion 13a over the range covering from the maximum screwed position and the minimum screwed position.
- Fig. 5(a) shows a state in which the extended projection 24 is located under the single thread portion 13a
- Fig. 5(b) shows a state in which the other projections 23 are located under the single thread portion 13a.
- the extended projection 24 projects from the inner circumferential face 21 of the cap 20 more outward than the other projections 23.
- the extended projection 24 has an angular edge portion 24a.
- the projection 25 also projects from the inner circumferential face 21 of the cap 20 more outward than the other projections 23 and has an angular edge portion.
- an outer seal 27 projects from an inner face 26a of the top 26 of the cap 20 to seal the outer circumferential face 11 of the outer mouth 10.
- a rib 28 is provided in a portion of the cap corresponding to the single thread portion 13a when the cap 20 is screwed to seal the mouth part 10 tight for connecting the outer seal 27 to the inner circumferential face 21 of the cap 20. More particularly, the rib 28 is provided above each of the extended projections 24 and 25.
- the extended projection 24 and/or the extended projection 25 is located under the single thread portion 13a. More particularly, the single thread portion 13a engages with the extended projection 24 or the extended projection 25 when the inner pressure of the bottle 1 increases to push up the top 26 of the cap 20. It is common that a force for preventing the engaged female screw 12 from being pushed up is decreased in the single thread portion 13a.
- the lid assembly S according to the current embodiment can prevent deformation of the engaged extended projections 24 and 25 because those projections have increased lengths in the circumferential direction. Consequently, the single thread portion 13a prevents the female screw 12 from being pushed up.
- the extended projection 24 projects from the inner circumferential face 21 of the cap 20 more outward than the other projections 23, which allows the extended projection 24 to come into contact with the single thread portion 13a with a wide area.
- the angular edge portion 24a of the extended projection 24 allows the projection 24 to engage with the single thread portion 13a more firmly. Such an arrangement further prevents the female screw 13 from being pushed up.
- the extended projection 25 is shaped in a similar manner to the extended projection 24, and thus performs the same effect.
- the rib 28 is provided in the position of the cap corresponding to the single thread portion 13a to connect the outer seal 27 to the inner circumferential face 21 of the cap 20, which prevents expansion and deformation of the top 26 of the cap 20. Such an arrangement further prevents the top 26 of the cap 20 from being pushed up.
- the lid assembly S according to the current embodiment increases the force of preventing the female screw 23 from being pushed up and prevents expansion and deformation of the top 26 of the cap 20, and eventually prevents the top 26 of the cap 20 from being pushed up. In this manner, the lid assembly S according to the current embodiment can desirably maintain the sealed state in the bottle 1 only by changing the design of the cap 20.
- the present invention is applicable to any lid assembly for a resin container to be filled with a liquid, for example.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Closures For Containers (AREA)
Description
- The present invention relates to a lid assembly for a resin container including a mouth part with a male screw provided in its outer circumferential face, and a cap with a female screw provided in its inner circumferential face, the female screw having a plurality of projections that intermittently continue in a circumferential direction, in which the male screw has a single thread portion formed at least in part of a circumference of the screw where only one thread runs between a distal end and a proximal end of the mouth part, and the female screw of the cap is engaged with the male screw of the mouth part to screw the cap to seal the mouth part.
- When the resin container is filled with a carbonated beverage, for example, and is stored at high atmosphere temperature, the liquid thermally expands and then loses carbonic acid to increase inner pressure of the container. While a top of the cap is pushed up with the increase of the inner pressure, the male screw provided in the mouth part engages with the female screw provided in the cap to prevent the female screw positioned under the male screw from being pushed up, which in turn prevents the top of the cap from being pushed up. As a result, the resin container is maintained in a sealed state to prevent loss of carbonic acid.
-
US 2009/045158 A1 describes an internally threaded plastic closure including an array of axially extending, circumferentially spaced internal ribs which intersect the internal thread formation of the closure. - On the other hand, the inventors have found that the arrangement including the single thread portion formed in part of the circumference of the male screw where only one thread runs between the distal end and the proximal end of the mouth part decreases a force of preventing the female screw from being pushed up in the single thread portion. In such a case, the increase in inner pressure of the resin container might break the sealed state and lead to loss of carbonic acid. To eliminate such a disadvantage, a design change in the mouth part may be suggested so that the single thread portion may not be present. Such a change, however, should be accompanied by a design change in the cap as well. Further, increasing the number of threads might cause other disadvantages such as increasing the height of the mouth part or resulting in special specifications that do not meet the standards of the general-purpose mouth part.
- An object of the present invention is to provide a lid assembly for a resin container for desirably maintaining a sealed state of the resin container only by changing a design of a cap.
- A lid assembly for a resin container according to the present invention includes a mouth part with a male screw provided in its outer circumferential face, and a cap with a female screw provided in its inner circumferential face. The female screw has a plurality of projections that intermittently continue in a circumferential direction. The male screw has a single thread portion formed at least in part of a circumference of the screw where only one thread runs between a distal end and a proximal end of the mouth part. The female screw of the cap is engaged with the male screw of the mouth part to screw the cap to seal the mouth part. The projections include extended projections to be located under the single thread portion of the male screw. Each of the extended projections has a circumferential length greater than a circumferential length of the other projections.
- It is common to provide the plurality of projections that intermittently continue in the circumferential direction in female screw of the cap to form gaps in the screw, which provides a compact design, removes residual of the liquid spilled out of the container when the cap is screwed and attached to the female screw, and effectively releases inner pressure of the container. The inventors have found that a force of preventing the female screw from being pushed up can be enhanced by increasing the length of the projection engaging with the single thread portion (i.e., located under the single thread portion) in the arrangement of the female screw of the cap in which the plurality of projections that intermittently continue, which dispenses with the need for changing the design of the male screw in the mouth part. More particularly, while the projections would deform when the female screw is pushed up, such deformation can be prevented by increasing the length of the projections. As a result, the female screw is prevented from being pushed up.
- Further, the above arrangement in which the projection located under the single thread portion has a circumferential length greater than a circumferential length of the other projections prevents the female screw from being pushed up and eventually prevents a top of the cap from being pushed up. Therefore, such an arrangement can desirably maintain the sealed state of the resin container only by changing the design of the cap.
- Other preferable embodiments of the lid assembly for a resin container will be described hereinafter. It should be noted that the scope of the present invention is not limited by the following embodiments.
- According to one preferable embodiment, the extended projections are located under the single thread portion over the range covering from a maximum screwed position in which the cap is screwed to the mouth part to a maximum amount, to a minimum screwed position in which the cap is screwed to the mouth part to a minimum amount required to seal the mouth part.
- More particularly, to seal the mouth part tight, the cap is not necessarily screwed to the mouth part to the maximum amount (maximum screwed position) but is only required to be screwed to the minimum necessary amount (minimum screwed position). In other words, the mount part can be sealed tight by screwing the cap to any position between the maximum screwed position and the minimum screwed position. In the above arrangement, the extended projections are located under the single thread portion over the range covering from the maximum screwed position to the minimum screwed position, which allows the extended projections to be located under the single thread portion in any position between the maximum screwed position and the minimum screwed position. Thus, the female screw is prevented more accurately from being pushed up.
- According to one preferable embodiment, the extended projections project from the inner circumferential face of the cap more outward than the other projections.
- Such an arrangement allows the extend projection to come into contact with the single thread portion with a wider area, and thus can further prevent the female screw from being pushed up and eventually prevent the top of the cap from being pushed up.
- According to one preferable embodiment, the extended projections have an angular edge portion.
- Providing the extended projections with the angular edge portion allows the extended projections to engage with the single thread portion more firmly. Such an arrangement can further prevent the female screw from being pushed up and eventually prevent the top of the cap from being pushed up.
- According to one preferable embodiment, a rib is provided at least in a portion of the cap corresponding to the single thread portion for connecting an outer seal provided in the cap to the inner circumferential face of the cap, the outer seal sealing the outer circumferential face of the mouth part.
- The top of the cap is pushed up because it has been expanded and deformed. The above arrangement provides the rib between the outer seal and the inner circumferential face of the cap. Thus, the rib can prevent the top of the cap from expanding and deforming in the portion corresponding to the single thread portion, which can further prevent the top of the cap from being pushed up.
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Fig. 1 is an illustrative perspective view of a lid assembly; -
Fig. 2 is a partially sectional front view of a cap; -
Fig. 3 is an illustrative perspective view of the lid assembly in a maximum screwed position; -
Fig. 4 is an illustrative perspective view of the lid assembly in a minimum screwed position; -
Fig. 5(a) is a sectional view showing a state in which an extended projection is located under a single thread portion; -
Fig. 5(b) is a sectional view showing a state in which another projection is located under a single thread portion; and -
Fig. 6 is a sectional view of the cap. - A lid assembly for a resin container according to preferred embodiments of the present invention will be described hereinafter in reference to the accompanying drawings. The lid assembly S for a resin container according to one of the preferred embodiments includes a
mouth part 10 having amale screw 12 provided in its outercircumferential face 11, and acap 20 having afemale screw 22 provided in its innercircumferential face 21. Thefemale screw 22 includes a plurality ofprojections 23 that intermittently continue in a circumferential direction. Themale screw 12 has asingle thread portion 13a formed at least in part of the circumference of the screw where only one thread runs between a distal end and a proximal end of themouth part 10. Thefemale screw 22 of thecap 20 is engaged with themale screw 12 of themouth part 10 to screw thecap 20 to seal themouth part 10 tight. Theprojections 23 includeextended projections single thread portion 13a of themale screw 12. Each of theextended projections other projections 23. Such an arrangement can increase a force of preventing thefemale screw 22 from being pushed up, which can eventually prevent atop 26 of thecap 20 from being pushed up. The lid assembly S according to the current embodiment will be described hereinafter in more detail when applied to a plastic bottle 1 ("bottle 1" hereinafter) as the resin container. - Referring to
Fig. 1 , the lid assembly S includes themouth part 10 and thecap 20 attached to themouth part 10. Themouth part 10 has themale screw 12 provided in its outercircumferential face 11, and thecap 20 has thefemale screw 22 provided in its innercircumferential face 21. Thefemale screw 22 of thecap 20 is engaged with themale screw 12 of themouth part 10 to screw thecap 20 to seal themouth part 10 tight. - The
bottle 1 may be made of a primary component of thermoplastic resin such as polyethylene, polypropylene, and polyethyleneterephthalate to be integrally molded by stretch molding such as biaxial stretch blow molding. The capacity of thebottle 1 may unlimitedly range from 200 milliliters to 2 liters, which are commonly distributed. - A liquid filling the
bottle 1 is not limited and may be drinkables such as drinking water, tea, fruit juice, coffee, cocoa, refreshing beverages, alcoholic beverages, lactic beverages and soup, or liquid flavoring such as sauce and soy sauce. Thelid assembly 1 according to the current embodiment is particularly preferable when applied to thebottle 1 filled with a carbonated beverage, which may particularly increase inner pressure of thebottle 1 when thebottle 1 is stored at high atmosphere temperature to thermally expand the liquid and cause loss of carbonic acid. Other beverages than the carbonated beverage may also increase the inner pressure of thebottle 1 by thermal expansion of the content, and thus thelid assembly 1 according to the current embodiment may be preferably used for noncarbonated beverages as well. - The
male screw 12 of themouth part 10 includesthreads 13 that radially project from its outer circumferential face 11 (in a direction normal to the outer circumferential face 11) and intermittently continue spirally in the circumferential direction. Themale screw 12 has thesingle thread portion 13a formed at least in part of the circumference of the screw where only one thread runs between the distal end and the proximal end of themouth part 10. - As shown in
Figs. 1 and 2 , the plurality ofprojections 23 formed in thefemale screw 22 of thecap 20 run intermittently continuously in the circumferential direction. The male screw 12 (threads 13) and the female screw 22 (projections 23) complement each other so that each of thethreads 13 of themale screw 12 may be fitted to a gap defined by two verticallyadjacent projections 23. - The
projections 23 of themale screw 22 includes theextended projections projections 23. Thoseextended projections single thread portion 13a of the male screw 12 (adjacent to the proximal end of the mouth part 10) when thecap 20 is screwed to seal themouth part 10 tight. - To seal the
mouth part 10 tight, thecap 20 is not necessarily screwed to themouth part 10 to a maximum amount (maximum screwed position) but is only required to be screwed to a minimum necessary amount (minimum screwed position). In other words, themount part 10 can be sealed tight by screwing the cap to any position between the maximum screwed position and the minimum screwed position. A difference in screw amount between the maximum screwed position and the minimum screwed position corresponds to a length of an arc of a circle with its central angle of 35 degrees when the outercircumferential face 11 of themouth part 10 is defined as a circumference of the circle. - In view of the above, each of the
extended projections circumferential face 11 of themouth part 10 is defined as the circumference of the circle. More particularly, theextended projections extended projection 24 is located under thesingle thread portion 13a in the maximum screwed position (seeFig. 3 ), theextended projection 25 is located under thesingle thread portion 13a in the minimum screwed position (seeFig. 4 ). In a screwed position between the maximum screwed position and the minimum screwed position (seeFig. 1 ), both theextended projections single thread portion 13a. In other words, theextended projection 24 and/or theextended projection 25 is located under thesingle thread portion 13a over the range covering from the maximum screwed position and the minimum screwed position. -
Fig. 5(a) shows a state in which the extendedprojection 24 is located under thesingle thread portion 13a, andFig. 5(b) shows a state in which theother projections 23 are located under thesingle thread portion 13a. As seen fromFigs. 5(a) and 5(b) , theextended projection 24 projects from the innercircumferential face 21 of thecap 20 more outward than theother projections 23. Further, theextended projection 24 has anangular edge portion 24a. Similarly to theprojection 24, theprojection 25 also projects from the innercircumferential face 21 of thecap 20 more outward than theother projections 23 and has an angular edge portion. - Referring to
Figs. 5 and6 , anouter seal 27 projects from aninner face 26a of the top 26 of thecap 20 to seal the outercircumferential face 11 of theouter mouth 10. Arib 28 is provided in a portion of the cap corresponding to thesingle thread portion 13a when thecap 20 is screwed to seal themouth part 10 tight for connecting theouter seal 27 to the innercircumferential face 21 of thecap 20. More particularly, therib 28 is provided above each of theextended projections - The following will describe a state in which the
cap 20 is screwed to seal themouth part 10 tight. As shown inFigs. 1 ,3 and 4 , theextended projection 24 and/or theextended projection 25 is located under thesingle thread portion 13a. More particularly, thesingle thread portion 13a engages with theextended projection 24 or theextended projection 25 when the inner pressure of thebottle 1 increases to push up the top 26 of thecap 20. It is common that a force for preventing the engagedfemale screw 12 from being pushed up is decreased in thesingle thread portion 13a. On the other hand, the lid assembly S according to the current embodiment can prevent deformation of the engagedextended projections single thread portion 13a prevents thefemale screw 12 from being pushed up. - Referring to
Figs. 5(a) and 5(b) again, theextended projection 24 projects from the innercircumferential face 21 of thecap 20 more outward than theother projections 23, which allows the extendedprojection 24 to come into contact with thesingle thread portion 13a with a wide area. Theangular edge portion 24a of theextended projection 24 allows theprojection 24 to engage with thesingle thread portion 13a more firmly. Such an arrangement further prevents thefemale screw 13 from being pushed up. Theextended projection 25 is shaped in a similar manner to theextended projection 24, and thus performs the same effect. - Further, the
rib 28 is provided in the position of the cap corresponding to thesingle thread portion 13a to connect theouter seal 27 to the innercircumferential face 21 of thecap 20, which prevents expansion and deformation of the top 26 of thecap 20. Such an arrangement further prevents the top 26 of thecap 20 from being pushed up. - As described above, the lid assembly S according to the current embodiment increases the force of preventing the
female screw 23 from being pushed up and prevents expansion and deformation of the top 26 of thecap 20, and eventually prevents the top 26 of thecap 20 from being pushed up. In this manner, the lid assembly S according to the current embodiment can desirably maintain the sealed state in thebottle 1 only by changing the design of thecap 20. - Lastly, alternative embodiments of the lid assembly for a resin container according to the present invention will be described hereinafter. It should be noted that any one of the following embodiments may be combined with any other embodiment if no inconsistency would arise.
- (1) The length of the
extended projections - (2) In the above embodiment, the
extended projection 24 and/or theextended projection 25 is located under thesingle thread portion 13a over the range covering from the maximum screwed position and the minimum screwed position. However, the lid assembly according to the present invention is not limited to such an arrangement. For example, theextended projection 24 and/or theextended projection 25 may be located under thesingle thread portion 13a only in the maximum screwed position, or in the minimum screwed position, or in a selected position between the maximum screwed position and the minimum screwed position. - (3) In the above embodiment, the
projection 24 is projected from the innercircumferential face 21 of thecap 20 more outward than theother projections 23 and has theangular edge portion 24a as shown inFig. 5(a) . However, the lid assembly according to the present invention is not limited to such an arrangement. For example, theprojection 24 may be projected from the innercircumferential face 21 of thecap 20 by the same amount as theother projections 23. Theedge portion 24a may not be angular. Theextended projection 25 may be modified in the same manner. - (4) In the above embodiment, the
rib 28 is provided in the position of the cap corresponding to thesingle thread portion 13a to connect theouter seal 27 to the innercircumferential face 21 of thecap 20. However, the lid assembly according to the present invention is not limited to such an arrangement. For example, the rib is dispensable and may be provided in any position other than the portion corresponding to thesingle thread portion 13a. - (5) It should be understood that the embodiments disclosed here are exemplary in nature and that the scope of the present invention is solely defined by the wording of the appended claims.
- The present invention is applicable to any lid assembly for a resin container to be filled with a liquid, for example.
-
- S
- lid assembly
- 1
- resin container
- 10
- mouth part
- 11
- outer circumferential face
- 12
- male screw
- 13a
- single thread portion
- 20
- cap
- 21
- inner circumferential face
- 22
- female screw
- 23
- projection
- 24, 25
- extended projection
- 24a, 25a
- edge portion
- 27
- outer seal
- 28
- rib
Claims (5)
- A lid assembly (S) for a resin container (1), the lid assembly (S) comprising:a mouth part (10) including a male screw (12) provided in its outer circumferential face (11); anda cap (20) including a female screw (22) provided in its inner circumferential face (21), the female screw (22) having a plurality of projections (23) that intermittently continue in a circumferential direction,wherein the male screw (12) has a single thread portion (13a) formed at least in part of a circumference of the screw (12) where only one thread runs between a distal end and a proximal end of the mouth part (10),wherein the female screw (22) of the cap (20) is engaged with the male screw (12) of the mouth part (10) to screw the cap (20) to seal the mouth part (10),characterized in thatthe projections (23) include at least two extended projections (24, 25) to be located under the single thread portion (13a) of the male screw (12), each of the extended projections (24, 25) having a circumferential length greater than a circumferential length of each of the other projections.
- The lid assembly (S) according to claim 1 or 2, wherein the extended projections (24, 25) are located under the single thread portion over the range covering from a maximum screwed position in which the cap (20) is screwed to the mouth part (10) to a maximum amount, to a minimum screwed position in which the cap (20) is screwed to the mouth part (10) to a minimum amount required to seal the mouth part (10).
- The lid assembly (S) according to claim 1 or 2, wherein the extended projections (24, 25) project from the inner circumferential face (21) of the cap (20) more outward than the other projections.
- The lid assembly (S) according to any one of claims 1 to 3, wherein the extended projections (24, 25) have an angular edge portion.
- The lid assembly (S) according to any one of claims 1 to 4, wherein a rib is provided at least in a portion of the cap (20) corresponding to the single thread portion (13a) for connecting an outer seal provided in the cap (20) to the inner circumferential face (21) of the cap (20), the outer seal sealing the outer circumferential face (11) of the mouth part (10).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2015/058840 WO2016151746A1 (en) | 2015-03-24 | 2015-03-24 | Cap structure for resin container |
Publications (3)
Publication Number | Publication Date |
---|---|
EP3275801A1 EP3275801A1 (en) | 2018-01-31 |
EP3275801A4 EP3275801A4 (en) | 2018-12-19 |
EP3275801B1 true EP3275801B1 (en) | 2020-05-27 |
Family
ID=56978847
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15886299.5A Active EP3275801B1 (en) | 2015-03-24 | 2015-03-24 | Lid assembly for resin container |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP3275801B1 (en) |
JP (1) | JP6595579B2 (en) |
ES (1) | ES2805097T3 (en) |
SG (1) | SG11201707785WA (en) |
TW (1) | TWI603896B (en) |
WO (1) | WO2016151746A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT202100001430A1 (en) * | 2021-01-26 | 2022-07-26 | Sacmi | CAP FOR CONTAINER. |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11505371B2 (en) | 2015-10-23 | 2022-11-22 | Husky Injection Molding Systems Ltd. | Containers and closures |
JP6956749B2 (en) * | 2017-09-28 | 2021-11-02 | サントリーホールディングス株式会社 | Bottle with positive internal pressure |
US10543960B2 (en) * | 2017-11-28 | 2020-01-28 | Thermos L.L.C. | Lid for a beverage container |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4090629A (en) * | 1977-08-22 | 1978-05-23 | International Tools (1973) Limited | Spiral lock safety closure |
JP2004035066A (en) * | 2002-07-04 | 2004-02-05 | Toppan Printing Co Ltd | Cap with diameter distortion corrective rib |
US20090045158A1 (en) * | 2007-08-14 | 2009-02-19 | Alcoa Closure Systems International, Inc. | Threaded closure with internal ribs |
GB2476089A (en) * | 2009-12-10 | 2011-06-15 | Beeson & Sons Ltd | Container closure assembly with tamper evident ring |
JP5934613B2 (en) * | 2012-02-14 | 2016-06-15 | 日本山村硝子株式会社 | Resin cap |
-
2015
- 2015-03-24 WO PCT/JP2015/058840 patent/WO2016151746A1/en active Application Filing
- 2015-03-24 JP JP2017507202A patent/JP6595579B2/en active Active
- 2015-03-24 ES ES15886299T patent/ES2805097T3/en active Active
- 2015-03-24 EP EP15886299.5A patent/EP3275801B1/en active Active
- 2015-03-24 SG SG11201707785WA patent/SG11201707785WA/en unknown
-
2016
- 2016-03-21 TW TW105108670A patent/TWI603896B/en active
Non-Patent Citations (1)
Title |
---|
None * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT202100001430A1 (en) * | 2021-01-26 | 2022-07-26 | Sacmi | CAP FOR CONTAINER. |
EP4032828A1 (en) * | 2021-01-26 | 2022-07-27 | Sacmi Cooperativa Meccanici Imola Societa' Cooperativa | Cap for container |
US11565854B2 (en) | 2021-01-26 | 2023-01-31 | Sacmi Cooperativa Meccanici Imola Societa' Cooperativa | Cap for a container |
Also Published As
Publication number | Publication date |
---|---|
SG11201707785WA (en) | 2017-10-30 |
EP3275801A4 (en) | 2018-12-19 |
JPWO2016151746A1 (en) | 2018-01-25 |
ES2805097T3 (en) | 2021-02-10 |
TW201641379A (en) | 2016-12-01 |
EP3275801A1 (en) | 2018-01-31 |
JP6595579B2 (en) | 2019-10-23 |
WO2016151746A1 (en) | 2016-09-29 |
TWI603896B (en) | 2017-11-01 |
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