US20140231375A1 - Pet container having inward thread finish - Google Patents
Pet container having inward thread finish Download PDFInfo
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- US20140231375A1 US20140231375A1 US14/182,895 US201414182895A US2014231375A1 US 20140231375 A1 US20140231375 A1 US 20140231375A1 US 201414182895 A US201414182895 A US 201414182895A US 2014231375 A1 US2014231375 A1 US 2014231375A1
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- United States
- Prior art keywords
- container
- thread
- vertical cylinder
- cylinder portion
- container according
- 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.)
- Abandoned
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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
- B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
- B65D1/02—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents
- B65D1/0223—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by shape
- B65D1/023—Neck construction
- B65D1/0246—Closure retaining means, e.g. beads, screw-threads
Definitions
- Apparatuses and methods consistent with the present invention relate to a polyethylene terephythalate (PET) container and a method for making the same by forming an inward thread finish.
- PET polyethylene terephythalate
- FIG. 12 shows a conventional thread on a container top.
- the thread is formed as a projection projecting outwardly from a vertical cylindrical surface.
- aspects of the invention relate to a blow-molded PET container having an inward thread finish.
- aspects of the present invention solve the aforementioned problems by (1) moving the vertical cylinder of the finish body outward to what would have been the outer diameter of the threads in a conventional design and (2) forming the threads inwardly from the vertical cylinder of the finish body.
- This enables one to form, by blowing molding a container, threads having a smaller thread cross section.
- the threads can be formed with less material, heat and air pressure. This allows more attention to be paid to design of the rest of the container for a better processing.
- a method of making a blow-molded PET plastic container having an inward thread finish includes providing a mold having a neck forming surface comprising a first surface configured to form a vertical cylinder portion of a bottle and a projecting portions projecting outward from the first surface that are configured to form helical threads, and stretching the preform against the mold surface to form a neck portion of the container, the neck portion comprising a vertical cylinder portion having helical threads formed radially inward of the vertical cylinder portion.
- portions of the preform forming the vertical cylinder portions are stretched to a greater length than portions forming an inner surface of the helical threads, the inner surface being radially inward of the vertical cylinder portion.
- a container includes a body portion having a bottom portion and a sidewall portion.
- the container also includes a neck portion formed above the body portion and defining an opening at a top of the container.
- the neck portion further includes a vertical cylinder portion extending vertically upward from the body portion, the vertical cylinder portion having a thread portion formed therein, the thread portion formed as a concave profile around the vertical cylinder portion.
- the container also includes a top portion formed at an uppermost part of the vertical cylinder portion and extending in a horizontal direction.
- the thread portion includes a helical groove that is formed radially inward of and around the vertical cylinder portion.
- the top portion of the container joins the vertical cylindrical wall at a position that is radially outward of the thread portion.
- the thread portion comprises multiple non-intersecting grooves.
- the thread portion comprises an inner surface, an upper surface and a lower surface, the inner surface joining the upper surface and the lower surface, the upper surface and the lower surface extending from different portions of the vertical cylindrical portion. Further, a maximum width between the upper surface and the lower surface is ranges from 0.084 to 0.120 inches.
- a depth of the thread portion from the vertical cylindrical surfaces ranges from 0.042 to 0.060 inches.
- the width of the helical groove is less than a width of a portion of the vertical cylindrical portion between adjacent grooves.
- FIGS. 1A-1D show inward threads formed on a top portion of a bottle.
- FIGS. 2A-2D show another embodiment of a container top having inwardly formed threads.
- FIGS. 3A-3D show another embodiment of a container top having inwardly formed threads.
- FIGS. 4A-4D show another embodiment of a container top having inwardly formed threads.
- FIGS. 5A-5D show another embodiment of a container top having inwardly formed threads.
- FIGS. 6A-6D show another embodiment of a container top having inwardly formed threads.
- FIGS. 7A-7C show another embodiment of a container top having inwardly formed threads having a two lead finish.
- FIGS. 8A-8C show an embodiment of a container top having inwardly formed threads having a four lead finish.
- FIGS. 9A-9C show a blown up view of the thread entrance ramps in accord with the various embodiments.
- FIG. 10 is a flowchart showing a method of making a blow molded container.
- FIG. 11 shows a preform used to form a container using blow molding.
- FIG. 12 shows a conventional thread on a container top.
- a container having a top portion 10 having inwardly formed threads 20 .
- the top portion 10 comprises an outer vertical cylinder portion 15 that has a horizontal flange 30 used as a sealing surface at the top thereof.
- the thread is comprised of a helical groove that is formed radially inward of and around the outer vertical cylinder portion 15 . This results in a thread 20 formed into the vertical cylinder portion 15 to allow engagement with the closure.
- Each thread has an inner surface 70 , an upper surface 50 and a lower surface 60 . In this embodiment, both the upper surface 50 and the lower surface 60 are inclined at the same angle with respect to the inner surface 70 . These surfaces define the thread profile of the thread 20 .
- the outermost part of the thread forming region is comprised of the vertical cylinder portion 15 , not threads as in a conventional design.
- the forming occurs by expanding a pre-form outwardly.
- details such as threads
- the thread 20 inwardly of the vertical cylinder portion 15 , a smaller thread profile can be used and accurately formed. This is beneficial when finishes using thread helixes having shallow slopes or multiple thread leads, which tend to crowd together, are formed.
- the top portion 10 can be made of a larger diameter then the case when the thread is formed outwardly from the vertical wall. This moves the sealing surface of the top portion 10 (outward diametrically) into a better position to match the seal beads on the closure (lid).
- the container may also be injection molded.
- An open portion 40 where the thread 20 opens to the horizontal flange 30 (sealing surface) can run out or extend for a minimum distance based on the length of the thread root divided by the pitch of the thread helix.
- This embodiment uses a minimum thread run out into the sealing surface, but the present invention is not limited to this minimum distance. Variations of the finish are shown in the FIGS. 2A-8C .
- the open portion 40 defining the thread run out extends 96 degrees around the periphery of the circular top portion 10 .
- the thread profile is defined by a vertically extending inner surface 70 , an upper surface 50 and a lower surface 60 .
- the upper surface 50 and the lower surface 60 extend at angles ⁇ u and 0 l , respectively. These angles are measured with respect to a normal to the inner surface 70 .
- the value of ⁇ u is 10 degrees and the value of ⁇ l is 30 degrees.
- the lower surface 60 of the thread 20 terminates at a ramp portion 80 adjacent the top portion 10 .
- the ramp portion 80 comprises a straight entrance ramp.
- FIGS. 3A-3D has dimensions similar to the embodiment of FIGS. 2A-2D with the exception of the ramp portion 80 .
- the ramp portion comprises a 60 degree ramp portion.
- FIGS. 4A-4D has dimensions similar to the embodiment of FIGS. 3A-3D with the exception of the run out of the open portion 40 .
- the open portion 40 extends 116 degrees around the top portion 10 .
- FIGS. 5A-5D has dimensions similar to the embodiment of FIGS. 3A-3D with the exception of the ramp portion 80 .
- the ramp portion 80 comprises a curved entrance portion.
- FIGS. 7A-7C shows another thread 20 having a thread 20 defined by a thread profile having a curved inner surface 70 .
- the upper surface 50 extends at an angle of 25 degrees to a normal of the vertical cylinder portion 15 .
- the lower surface 60 extends at an angle of 39 degrees to the normal.
- This embodiment comprises a two lead finish.
- FIGS. 8A-8C shows another thread 20 having a similar finish to the thread of FIGS. 7A-7C with the exception that it comprises a four lead finish.
- FIGS. 9A-9C depict a blown up view of the thread entrance ramp portions 80 in accord with various embodiments.
- FIG. 9A shows a straight entrance ramp
- FIG. 9B shows a 60 degree entrance ramp
- FIG. 9C shows a curved entrance ramp.
- the width of the thread can range from 0.084 to 0.120 inches and can have a depth ranging from 0.042 to 0.060 inches.
- the width of the vertical wall portion defining the thread 20 can range from 0.045 to 0.140 inches. However, this wall portion is generally greater in width than the thread portions.
- a method of making a container in accord with an exemplary embodiment is described with reference to FIGS. 10 and 11 .
- a preform having a thread forming region 22 below the preform neck 18 is injection molded in operation S 1 and inserted into a mold having a thread forming portion configured to form an inward thread as described above.
- Air is blown into the preform to mold a domed container S 2 (dome above neck and thread portion).
- the domed portion is trimmed off of the container S 3 to produce as finished container as shown in the various embodiments described herein.
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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Containers Having Bodies Formed In One Piece (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
A container and a method for making a container having inwardly formed threads are provided. The container includes a body portion having a bottom portion and a sidewall portion. A neck portion is formed above the body portion and defines an opening at a top of the container. The neck portion includes a vertical cylinder portion extending vertically upward from the body portion, the vertical cylinder portion having a thread portion formed as a concave profile around the vertical cylinder portion.
Description
- This application claims the benefit of U.S. Provisional Patent Application No. 61/765,419 filed on Feb. 15, 2013 in the U.S. Patent Trademark Office, the disclosure of which is incorporated herein in its entirety by reference.
- 1. Field of the Invention
- Apparatuses and methods consistent with the present invention relate to a polyethylene terephythalate (PET) container and a method for making the same by forming an inward thread finish.
- 2. Description of the Related Art
- The current state of art for container finishes on blow and trim style containers consist of a cylinder with the threads projecting outward from that cylinder for engagement with the threads of the closure. The threads must be large enough in cross section to allow the plastic to form into them completely.
- In order to fully form the threads of the finish, enough material, heat and air pressure must be applied to the finish for proper closure application. This condition causes more attention to the finish and less to the body of the container sometimes resulting in limited process capabilities. The seal surface of the blow-trim type of finish also protrudes into the opening of the container and blocks the flow of product both into and out of the container. The radius between the seal surface and vertical cylinder that forms the body of the finish is large enough at times to cause less than desirable sealing.
-
FIG. 12 shows a conventional thread on a container top. The thread is formed as a projection projecting outwardly from a vertical cylindrical surface. - Aspects of the invention relate to a blow-molded PET container having an inward thread finish.
- Aspects of the present invention solve the aforementioned problems by (1) moving the vertical cylinder of the finish body outward to what would have been the outer diameter of the threads in a conventional design and (2) forming the threads inwardly from the vertical cylinder of the finish body. This enables one to form, by blowing molding a container, threads having a smaller thread cross section. Thus, the threads can be formed with less material, heat and air pressure. This allows more attention to be paid to design of the rest of the container for a better processing.
- According to one aspect, provided is a method of making a blow-molded PET plastic container having an inward thread finish, the method includes providing a mold having a neck forming surface comprising a first surface configured to form a vertical cylinder portion of a bottle and a projecting portions projecting outward from the first surface that are configured to form helical threads, and stretching the preform against the mold surface to form a neck portion of the container, the neck portion comprising a vertical cylinder portion having helical threads formed radially inward of the vertical cylinder portion.
- According to another aspect, portions of the preform forming the vertical cylinder portions are stretched to a greater length than portions forming an inner surface of the helical threads, the inner surface being radially inward of the vertical cylinder portion.
- According to another aspect, a container is provided. The container includes a body portion having a bottom portion and a sidewall portion. The container also includes a neck portion formed above the body portion and defining an opening at a top of the container. The neck portion further includes a vertical cylinder portion extending vertically upward from the body portion, the vertical cylinder portion having a thread portion formed therein, the thread portion formed as a concave profile around the vertical cylinder portion. The container also includes a top portion formed at an uppermost part of the vertical cylinder portion and extending in a horizontal direction.
- According to another aspect, the thread portion includes a helical groove that is formed radially inward of and around the vertical cylinder portion. the top portion of the container joins the vertical cylindrical wall at a position that is radially outward of the thread portion.
- According to another aspect, the thread portion comprises multiple non-intersecting grooves.
- According to another aspect, the thread portion comprises an inner surface, an upper surface and a lower surface, the inner surface joining the upper surface and the lower surface, the upper surface and the lower surface extending from different portions of the vertical cylindrical portion. Further, a maximum width between the upper surface and the lower surface is ranges from 0.084 to 0.120 inches.
- According to another aspect, a depth of the thread portion from the vertical cylindrical surfaces ranges from 0.042 to 0.060 inches.
- According to another aspect, the width of the helical groove is less than a width of a portion of the vertical cylindrical portion between adjacent grooves.
- The above and other aspects and features of the various aspects of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings in which:
-
FIGS. 1A-1D show inward threads formed on a top portion of a bottle. -
FIGS. 2A-2D show another embodiment of a container top having inwardly formed threads. -
FIGS. 3A-3D show another embodiment of a container top having inwardly formed threads. -
FIGS. 4A-4D show another embodiment of a container top having inwardly formed threads. -
FIGS. 5A-5D show another embodiment of a container top having inwardly formed threads. -
FIGS. 6A-6D show another embodiment of a container top having inwardly formed threads. -
FIGS. 7A-7C show another embodiment of a container top having inwardly formed threads having a two lead finish. -
FIGS. 8A-8C show an embodiment of a container top having inwardly formed threads having a four lead finish. -
FIGS. 9A-9C show a blown up view of the thread entrance ramps in accord with the various embodiments. -
FIG. 10 is a flowchart showing a method of making a blow molded container. -
FIG. 11 shows a preform used to form a container using blow molding. -
FIG. 12 shows a conventional thread on a container top. - According to a first non-limiting embodiment of the invention, provided is a container having a
top portion 10 having inwardly formedthreads 20. Thetop portion 10 comprises an outervertical cylinder portion 15 that has ahorizontal flange 30 used as a sealing surface at the top thereof. The thread is comprised of a helical groove that is formed radially inward of and around the outervertical cylinder portion 15. This results in athread 20 formed into thevertical cylinder portion 15 to allow engagement with the closure. Each thread has aninner surface 70, anupper surface 50 and alower surface 60. In this embodiment, both theupper surface 50 and thelower surface 60 are inclined at the same angle with respect to theinner surface 70. These surfaces define the thread profile of thethread 20. Thus, the outermost part of the thread forming region is comprised of thevertical cylinder portion 15, not threads as in a conventional design. - The forming occurs by expanding a pre-form outwardly. Thus, when details, such as threads, are to be formed, there is a limit to how small the cross-section (in vertical direction) of the detail can be, while still be correctly formed. Thus, by forming the
thread 20 inwardly of thevertical cylinder portion 15, a smaller thread profile can be used and accurately formed. This is beneficial when finishes using thread helixes having shallow slopes or multiple thread leads, which tend to crowd together, are formed. Additionally, as the thread is formed inwardly, thetop portion 10 can be made of a larger diameter then the case when the thread is formed outwardly from the vertical wall. This moves the sealing surface of the top portion 10 (outward diametrically) into a better position to match the seal beads on the closure (lid). - While the present invention is described with regard to blow molding method, the container may also be injection molded.
- An
open portion 40 where thethread 20 opens to the horizontal flange 30 (sealing surface) can run out or extend for a minimum distance based on the length of the thread root divided by the pitch of the thread helix. This embodiment uses a minimum thread run out into the sealing surface, but the present invention is not limited to this minimum distance. Variations of the finish are shown in theFIGS. 2A-8C . - In the embodiment of
FIGS. 2A-2D , theopen portion 40 defining the thread run out extends 96 degrees around the periphery of the circulartop portion 10. The thread profile is defined by a vertically extendinginner surface 70, anupper surface 50 and alower surface 60. Theupper surface 50 and thelower surface 60 extend at angles θu and 0 l, respectively. These angles are measured with respect to a normal to theinner surface 70. The value of θu is 10 degrees and the value of θl is 30 degrees. - The
lower surface 60 of thethread 20 terminates at aramp portion 80 adjacent thetop portion 10. In this embodiment, theramp portion 80 comprises a straight entrance ramp. - The embodiment depicted in
FIGS. 3A-3D has dimensions similar to the embodiment ofFIGS. 2A-2D with the exception of theramp portion 80. In this embodiment, the ramp portion comprises a 60 degree ramp portion. - The embodiment depicted in
FIGS. 4A-4D has dimensions similar to the embodiment ofFIGS. 3A-3D with the exception of the run out of theopen portion 40. In this embodiment, theopen portion 40 extends 116 degrees around thetop portion 10. - The embodiment depicted in
FIGS. 5A-5D has dimensions similar to the embodiment ofFIGS. 3A-3D with the exception of theramp portion 80. In this embodiment, theramp portion 80 comprises a curved entrance portion. - The embodiment depicted in
FIGS. 7A-7C shows anotherthread 20 having athread 20 defined by a thread profile having a curvedinner surface 70. Theupper surface 50 extends at an angle of 25 degrees to a normal of thevertical cylinder portion 15. Thelower surface 60 extends at an angle of 39 degrees to the normal. This embodiment comprises a two lead finish. - The embodiment depicted in
FIGS. 8A-8C shows anotherthread 20 having a similar finish to the thread ofFIGS. 7A-7C with the exception that it comprises a four lead finish. -
FIGS. 9A-9C depict a blown up view of the threadentrance ramp portions 80 in accord with various embodiments.FIG. 9A shows a straight entrance ramp,FIG. 9B shows a 60 degree entrance ramp andFIG. 9C shows a curved entrance ramp. - The width of the thread can range from 0.084 to 0.120 inches and can have a depth ranging from 0.042 to 0.060 inches. The width of the vertical wall portion defining the thread 20 (portion between threads) can range from 0.045 to 0.140 inches. However, this wall portion is generally greater in width than the thread portions.
- A method of making a container in accord with an exemplary embodiment is described with reference to
FIGS. 10 and 11 . First, a preform having athread forming region 22 below thepreform neck 18 is injection molded in operation S1 and inserted into a mold having a thread forming portion configured to form an inward thread as described above. Air is blown into the preform to mold a domed container S2 (dome above neck and thread portion). Thereafter, the domed portion is trimmed off of the container S3 to produce as finished container as shown in the various embodiments described herein. While this invention has been particularly shown and described with reference to exemplary embodiments thereof, the above description should be considered in as illustrations of the exemplary embodiments only and are not for purposes of limitation. Therefore, the scope of the invention is defined not by the detailed description of the invention but by the appended claims, and all differences within the scope will be construed as being included in the present invention.
Claims (10)
1. A method of making a blow-molded PET plastic container having an inward thread finish, the method comprising:
providing a mold having a neck forming surface comprising a first surface configured to form a vertical cylinder portion of a bottle and a projecting portions projecting outward from the first surface that are configured to form helical threads; and
stretching the preform against the mold surface to form a neck portion of the container, the neck portion comprising a vertical cylinder portion having helical threads formed radially inward of the vertical cylinder portion.
2. The method of claim 1 , wherein portions of the preform forming the vertical cylinder portions are stretched to a greater length than portions forming an inner surface of the helical threads, the inner surface being radially inward of the vertical cylinder portion.
3. A container, the container comprising:
a body portion comprising a bottom portion and a sidewall portion; and
a neck portion formed above the body portion and defining an opening at a top of the container,
the neck portion comprises:
a vertical cylinder portion extending vertically upward from the body portion, the vertical cylinder portion having a thread portion formed therein, the thread portion formed as a concave profile around the vertical cylinder portion; and
a top portion formed at an uppermost part of the vertical cylinder portion and extending in a horizontal direction.
4. The container according to claim 3 , wherein the thread portion comprises a helical groove that is formed radially inward of and around the vertical cylinder portion.
5. The container according to claim 3 , wherein the top portion of the container joints the vertical cylindrical wall at a position that is radially outward of the thread portion.
6. The container according to claim 3 , wherein the thread portion comprises multiple non-intersecting grooves.
7. The container according to claim 3 , wherein the thread portion comprises an inner surface, an upper surface and a lower surface, the inner surface joining the upper surface and the lower surface, the upper surface and the lower surface extending from different portions of the vertical cylindrical portion.
8. The container according to claim 7 , wherein a maximum width between the upper surface and the lower surface is ranges from 0.084 to 0.120 inches.
9. The container according to claim 3 , wherein a depth of the thread portion from the vertical cylindrical surfaces ranges from 0.042 to 0.060 inches.
10. The container according to claim 4 , wherein the width of the helical groove is less than a width of a portion of the vertical cylindrical portion between adjacent grooves.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US14/182,895 US20140231375A1 (en) | 2013-02-15 | 2014-02-18 | Pet container having inward thread finish |
Applications Claiming Priority (2)
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US201361765419P | 2013-02-15 | 2013-02-15 | |
US14/182,895 US20140231375A1 (en) | 2013-02-15 | 2014-02-18 | Pet container having inward thread finish |
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US20140231375A1 true US20140231375A1 (en) | 2014-08-21 |
Family
ID=51350401
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US14/182,895 Abandoned US20140231375A1 (en) | 2013-02-15 | 2014-02-18 | Pet container having inward thread finish |
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Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6415935B1 (en) * | 1998-04-29 | 2002-07-09 | Georg Menshen Gmbh & Co. Kg | Multiple-thread screw thread arrangement with diverse thread turn runout arrangement |
US20070158294A1 (en) * | 2004-01-30 | 2007-07-12 | Yoshino Kogyosho Co., Ltd. | Mouth cylindrical part of synthetic resin bottle |
US20070175855A1 (en) * | 2006-01-27 | 2007-08-02 | Penny Michael E | Preform and container having thread groove |
US20090078668A1 (en) * | 2007-09-21 | 2009-03-26 | Pepsico, Inc. | Lightweight Finish for Hot-fill Container |
US7735664B1 (en) * | 2006-04-18 | 2010-06-15 | Portola Packaging, Inc. | Tapered thread structure |
US20100270256A1 (en) * | 2006-01-27 | 2010-10-28 | Penny Michael E | Blow-Molded Container Having Thread Groove |
US20110309048A1 (en) * | 2008-10-22 | 2011-12-22 | Sidel Participations | Hollow body equipped with reliefs that enable the indexing thereof and process for handling such a body |
-
2014
- 2014-02-18 US US14/182,895 patent/US20140231375A1/en not_active Abandoned
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6415935B1 (en) * | 1998-04-29 | 2002-07-09 | Georg Menshen Gmbh & Co. Kg | Multiple-thread screw thread arrangement with diverse thread turn runout arrangement |
US20070158294A1 (en) * | 2004-01-30 | 2007-07-12 | Yoshino Kogyosho Co., Ltd. | Mouth cylindrical part of synthetic resin bottle |
US20070175855A1 (en) * | 2006-01-27 | 2007-08-02 | Penny Michael E | Preform and container having thread groove |
US20100270256A1 (en) * | 2006-01-27 | 2010-10-28 | Penny Michael E | Blow-Molded Container Having Thread Groove |
US7735664B1 (en) * | 2006-04-18 | 2010-06-15 | Portola Packaging, Inc. | Tapered thread structure |
US20090078668A1 (en) * | 2007-09-21 | 2009-03-26 | Pepsico, Inc. | Lightweight Finish for Hot-fill Container |
US20110309048A1 (en) * | 2008-10-22 | 2011-12-22 | Sidel Participations | Hollow body equipped with reliefs that enable the indexing thereof and process for handling such a body |
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