US20130082074A1 - Plastic aerosol container assembly and method of making - Google Patents

Plastic aerosol container assembly and method of making Download PDF

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Publication number
US20130082074A1
US20130082074A1 US13/251,830 US201113251830A US2013082074A1 US 20130082074 A1 US20130082074 A1 US 20130082074A1 US 201113251830 A US201113251830 A US 201113251830A US 2013082074 A1 US2013082074 A1 US 2013082074A1
Authority
US
United States
Prior art keywords
finish portion
plastic
aerosol container
undercut
plastic aerosol
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
Application number
US13/251,830
Other languages
English (en)
Inventor
Ralph Armstrong
Thomas E. Nahill
Keith J. Barker
Brian A. Lynch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Graham Packaging Co LP
Original Assignee
Graham Packaging Co LP
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Graham Packaging Co LP filed Critical Graham Packaging Co LP
Priority to US13/251,830 priority Critical patent/US20130082074A1/en
Assigned to GRAHAM PACKAGING COMPANY, L.P. reassignment GRAHAM PACKAGING COMPANY, L.P. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ARMSTRONG, RALPH, BARKER, KEITH J., LYNCH, BRIAN A., NAHILL, THOMAS E.
Assigned to THE BANK OF NEW YORK MELLON reassignment THE BANK OF NEW YORK MELLON PATENT SECURITY AGREEMENT Assignors: GRAHAM PACKAGING COMPANY, L.P.
Priority to CA2851083A priority patent/CA2851083C/en
Priority to MX2014004085A priority patent/MX368245B/es
Priority to EP12784780.4A priority patent/EP2763912B1/en
Priority to ES12784780.4T priority patent/ES2559463T3/es
Priority to PCT/US2012/058518 priority patent/WO2013052522A1/en
Priority to CA3076133A priority patent/CA3076133C/en
Priority to CN201280046534.7A priority patent/CN103826991B/zh
Priority to PL12784780T priority patent/PL2763912T3/pl
Priority to EP14193843.1A priority patent/EP2865611B1/en
Publication of US20130082074A1 publication Critical patent/US20130082074A1/en
Priority to MX2019008223A priority patent/MX2019008223A/es
Priority to US15/787,336 priority patent/US10773875B2/en
Assigned to GRAHAM PACKAGING COMPANY, L.P. reassignment GRAHAM PACKAGING COMPANY, L.P. RELEASE OF SECURITY INTEREST IN CERTAIN PATENT COLLATERAL Assignors: THE BANK OF NEW YORK MELLON, AS THE COLLATERAL AGENT AND TRUSTEE
Abandoned legal-status Critical Current

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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
    • B65D83/00—Containers or packages with special means for dispensing contents
    • B65D83/14—Containers or packages with special means for dispensing contents for delivery of liquid or semi-liquid contents by internal gaseous pressure, i.e. aerosol containers comprising propellant for a product delivered by a propellant
    • B65D83/38—Details of the container body
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
    • B29C49/06—Injection blow-moulding
    • 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
    • B65D83/00—Containers or packages with special means for dispensing contents
    • B65D83/14—Containers or packages with special means for dispensing contents for delivery of liquid or semi-liquid contents by internal gaseous pressure, i.e. aerosol containers comprising propellant for a product delivered by a propellant
    • B65D83/44—Valves specially adapted therefor; Regulating devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
    • B29C2049/023—Combined blow-moulding and manufacture of the preform or the parison using inherent heat of the preform, i.e. 1 step blow moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
    • B29K2067/003—PET, i.e. poylethylene terephthalate

Definitions

  • This invention relates broadly to the field of containers that are adapted to hold highly pressurized contents, such as aerosol mixtures, and more particularly to a blow molded plastic aerosol container having a finish portion that is constructed and arranged to provide an optimal seal to an aerosol valve assembly.
  • Aerosol containers have conventionally been fabricated from metal, and are conventionally formed as a cylindrical tube having upper and lower end closures.
  • the bottom end closure is typically shaped as a concave dome, and the upper end closure typically includes a manually actuatable valve for dispensing the pressurized aerosol contents of the container.
  • Metallic containers have certain inherent disadvantages, such as a tendency to rust over time and to scratch surfaces with which they may come into contact.
  • Aerosol containers commonly require internal pressures of the magnitude of 50-300 psi, which is significantly greater than pressures that are typically encountered in other packaging applications for which plastic material has been used, such as the packaging of carbonated beverages. Accordingly, design considerations for plastic aerosol containers are quite different than they are for lower pressure packaging applications such as plastic beverage containers.
  • plastic container is fabricated from a material such as polyethylene terephthalate (PET) and is manufactured from an injection molded preform having a threaded finish portion using the reheat stretch blow molding process. While such containers hold some promise for aerosol applications, they are susceptible to stress cracking in the finish portion while under pressurization. In addition, the finish portion of such containers has a tendency to deform when the container is pressurized, possibly resulting in a loss of sealing integrity between the container and the aerosol dispensing closure.
  • PET polyethylene terephthalate
  • the preforms that are used in the reheat stretch blow molding process typically include a finish portion that remains substantially unchanged in shape as a result of the blow molding process.
  • the finish portion includes the upper rim of the container that defines the container opening.
  • the aerosol valve assembly that is required in plastic aerosol containers has been attached to the outer surface of the finish portion, which may be provided with external threading or one or more mounting flanges.
  • An inside seal has inherent mechanical advantages over an outside seal, but those in the field have considered an inside seal to be impractical for plastic aerosol containers because of the difficulty of mounting a valve assembly to the inner surface of the finish portion of a blow molded plastic container.
  • the inner surface of the finish portion in such a container tends to be smooth, with no features that would enable a valve assembly to gain the necessary purchase in order to prevent dislodgement.
  • a plastic aerosol container assembly includes a plastic container having a main body portion defining an interior space and a finish portion that defines an opening.
  • the finish portion has an inner surface that has an undercut defined therein.
  • the container assembly further includes an aerosol valve assembly mounted to the plastic container that has a portion that engages the inner surface of the finish portion so as to be retained by the undercut.
  • a plastic aerosol container includes a main body portion defining an interior space; and a finish portion that is unitary with the main body portion and has an inner surface that has an undercut defined therein.
  • a plastic aerosol container includes a main body portion defining an interior space; and a finish portion that is unitary with the main body portion.
  • the main body portion and the finish portion are fabricated from a material comprising polyethylene terephthalate. At least a portion of the finish portion is crystallized.
  • a method of forming a plastic aerosol container includes steps of (a) providing a preform having a finish portion; (b) blow molding a plastic container from the preform; and (c) reforming the finish portion so that an inner surface thereof has an undercut defined therein, and wherein step (c) is performed at some point after step (a).
  • FIG. 1 is a side elevational view of a plastic aerosol container assembly that is constructed according to a preferred embodiment of the invention
  • FIG. 2 is a fragmentary cross-sectional view showing a first step in a method that is performed according to the preferred embodiment of the invention
  • FIG. 3 is a fragmentary cross-sectional view showing a second step in a method that is performed according to the preferred embodiment of the invention
  • FIG. 4 is a fragmentary cross-sectional view showing a third step in a method that is performed according to the preferred embodiment of the invention.
  • FIG. 5 is a fragmentary cross-sectional view showing a fourth step in a method that is performed according to the preferred embodiment of the invention.
  • FIG. 6 is a fragmentary cross-sectional view showing a portion of the plastic aerosol container assembly that is depicted in FIG. 1 .
  • a plastic aerosol container assembly 10 that is constructed according to a preferred embodiment of the invention includes a main body portion 12 that defines an interior space in which a pressurized aerosol mixture 30 is preferably provided.
  • the plastic aerosol container assembly 10 further includes a neck finish portion 14 and a bottom portion 18 . Both the finish portion 14 and the bottom portion 18 are preferably unitary with the main body portion 12 .
  • the main body portion 12 and the bottom portion 18 are preferably blow molded from a plastic preform using the reheat stretch blow molding process.
  • the main body portion 12 , finish portion 14 and bottom portion 18 are preferably fabricated from a plastic material such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), acrilonitrile (AN), polycarbonate (PC), polyamide (Nylon), or a blend containing some combination of the same from a plastic preform using a conventional blow molding process such as the reheat stretch blow molding process.
  • the plastic container is fabricated from a high intrinsic viscosity polyethylene terephthalate material, which most preferably has an intrinsic viscosity that is substantially within a range of about 0.76 to about 0.95.
  • the main body portion 12 is preferably constructed and arranged to withstand aerosol pressurization within a range of about 50 psig to about 300 psig. More preferably, the main body portion 12 is constructed and arranged to withstand aerosol pressurization within a range of about 120 psig to about 180 psig.
  • the container assembly 10 is preferably pressurized with an aerosol mixture 30 at a range of pressurization that is substantially between about 50 psig to about 300 psig, and more preferably substantially within a range of about 120 psig to about 180 psig.
  • the aerosol mixture 30 preferably includes a propellant, which could be a liquefied gas propellant or a compressed or soluble gas propellant.
  • a propellant which could be a liquefied gas propellant or a compressed or soluble gas propellant.
  • Liquefied gas propellants that could be used include hydrocarbon propellants such as propane, isobutene, normal butane, isopentane, normal pentane and dimethyl ether, and hydrofluorocarbon propellants such as difluoroethane (HFC-152a) and tetrafluoroethane (HFC-134a).
  • Compressed and soluble gas propellants that could be used include carbon dioxide (C02), nitrous oxide (N20), nitrogen (N2) and compressed air.
  • the finish portion 14 preferably has an inner surface 20 that has an undercut 22 defined therein, as is best shown in FIG. 4 .
  • An aerosol valve assembly 24 is seated against the undercut 22 , as is best shown in FIG. 6 . Accordingly, the aerosol valve assembly 24 forms an inside seal with respect to the finish portion 14 .
  • the aerosol valve assembly 24 in the preferred embodiment is not directly secured to an outer surface of the finish portion 14 .
  • the finish portion 14 has a longitudinal axis 32 , and the undercut 22 is preferably oriented within a volume that is equidistant about a transverse plane 28 that is substantially perpendicular to the longitudinal axis 32 .
  • the undercut 22 preferably has a substantially horizontal orientation. This is best shown in FIG. 4 .
  • the undercut 22 preferably extends substantially along an entire inner circumference of the inner surface 20 of the finish portion 14 .
  • the plastic material forming the finish portion 14 is crystallized in at least one location within the finish portion 14 .
  • the crystallization could be throughout the entire finish portion 14 , or in selected portions of the finish portion 14 .
  • crystallization could be performed so that substantial crystallization is achieved in at least a first portion of the finish portion 14 , substantially no crystallization in a second portion of finish portion 14 and graded crystallization between the first and second portions of the finish portion 14 .
  • graded crystallization refers to a gradual transition between substantial crystallization and substantially no crystallization, as distinguished from a sharp or distinct non-graded pattern of contrast between crystallized and uncrystallized portions of the neck finish.
  • the gradation of crystallization is continuous, and may be either linear or non-linear with distance.
  • Such crystallization in a container neck finish is taught in U.S. Pat. 7,033,656 to Nahill et al., the entire disclosure of which is hereby incorporated by reference as if set forth fully herein.
  • FIGS. 2-6 A method of forming a plastic aerosol container assembly 10 according to a preferred embodiment of the invention is depicted in FIGS. 2-6 .
  • the finish portion 14 of the container after it has been shaped by the blow molding process typically has an inner surface 40 that is substantially smooth and vertical, with an upper rim 42 .
  • the finish portion 14 shown in FIG. 2 is reformed according to the preferred embodiment of the invention so that the inner surface will have the undercut that is shown in FIG. 4 .
  • Heat is preferably applied to the finish portion 14 that is shown in FIG. 2 in order to soften the plastic material.
  • the finish portion 14 is preferably heated to a temperature that is substantially within a range of about 280 degrees F. to about 370 degrees F., and more preferably substantially within a range of about 300 degrees F. to about 350 degrees F.
  • Heating time is preferably substantially within a range of about 20 seconds to about 65 seconds, and more preferably substantially within a range of about 30 seconds to about 55 seconds.
  • the finish portion 14 at this stage of the process includes an upper rim 33 that transitions to the inner surface 20 so as to define a radially inwardly extending convex lip 34 and a radially outwardly extending concave recess 36 that is positioned immediately beneath the radially inwardly extending convex lip 34 .
  • FIG. 5 depicts a blank aerosol valve assembly 24 being inserted into the opening defined by the upper lip 33 of the finish portion 14 that is shown in FIG. 4 .
  • the aerosol valve assembly 24 preferably includes a metallic panel 48 to which an aerosol valve stem 26 is mounted.
  • the metallic panel 48 includes an annular downwardly extending portion 50 that includes an outer wall portion 52 , which is oriented so as to be substantially straight and vertical, permitting convenient insertion of the blank aerosol valve assembly 24 into the opening.
  • the metallic panel 48 also preferably includes a flange portion 54 that is congruent with and seals against the upper rim 33 and the convex lip 34 of the finish portion 14 .
  • a tool is used to crimp the outer wall portion 52 outwardly into the position that is shown in FIG. 6 , in which the inward crimp 56 is seated securely against the undercut 22 , firmly securing the aerosol valve assembly 24 against dislodgement from the finish portion 14 as a result of the internal pressurization of the container.
  • Such an inside seal is mechanically preferable to outside seals that have heretofore been used in plastic aerosol container assemblies.
US13/251,830 2011-10-03 2011-10-03 Plastic aerosol container assembly and method of making Abandoned US20130082074A1 (en)

Priority Applications (12)

Application Number Priority Date Filing Date Title
US13/251,830 US20130082074A1 (en) 2011-10-03 2011-10-03 Plastic aerosol container assembly and method of making
EP14193843.1A EP2865611B1 (en) 2011-10-03 2012-10-03 Plastic aerosol container
MX2014004085A MX368245B (es) 2011-10-03 2012-10-03 Montaje de envase de plástico para aerosol y método de fabricación.
PCT/US2012/058518 WO2013052522A1 (en) 2011-10-03 2012-10-03 Plastic aerosol container assembly and method of manufacture
PL12784780T PL2763912T3 (pl) 2011-10-03 2012-10-03 Sposób wytwarzania zespołu pojemnika aerozolowego z tworzywa sztucznego
EP12784780.4A EP2763912B1 (en) 2011-10-03 2012-10-03 Method of manufacture of a plastic aerosol container assembly
ES12784780.4T ES2559463T3 (es) 2011-10-03 2012-10-03 Método de fabricación de un conjunto de recipiente de plástico para aerosol
CA2851083A CA2851083C (en) 2011-10-03 2012-10-03 Plastic aerosol container assembly and method of manufacture
CA3076133A CA3076133C (en) 2011-10-03 2012-10-03 Plastic aerosol container assembly and method of manufacture
CN201280046534.7A CN103826991B (zh) 2011-10-03 2012-10-03 塑料气溶胶容器组件及制造方法
MX2019008223A MX2019008223A (es) 2011-10-03 2014-04-03 Montaje de envase de plastico para aerosol y metodo de fabricacion.
US15/787,336 US10773875B2 (en) 2011-10-03 2017-10-18 Method of making a plastic aerosol container assembly

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US13/251,830 US20130082074A1 (en) 2011-10-03 2011-10-03 Plastic aerosol container assembly and method of making

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US15/787,336 Continuation US10773875B2 (en) 2011-10-03 2017-10-18 Method of making a plastic aerosol container assembly

Publications (1)

Publication Number Publication Date
US20130082074A1 true US20130082074A1 (en) 2013-04-04

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Application Number Title Priority Date Filing Date
US13/251,830 Abandoned US20130082074A1 (en) 2011-10-03 2011-10-03 Plastic aerosol container assembly and method of making
US15/787,336 Active 2032-11-15 US10773875B2 (en) 2011-10-03 2017-10-18 Method of making a plastic aerosol container assembly

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Application Number Title Priority Date Filing Date
US15/787,336 Active 2032-11-15 US10773875B2 (en) 2011-10-03 2017-10-18 Method of making a plastic aerosol container assembly

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US (2) US20130082074A1 (es)
EP (2) EP2763912B1 (es)
CN (1) CN103826991B (es)
CA (2) CA2851083C (es)
ES (1) ES2559463T3 (es)
MX (2) MX368245B (es)
PL (1) PL2763912T3 (es)
WO (1) WO2013052522A1 (es)

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US20130037580A1 (en) * 2011-08-01 2013-02-14 Graham Packaging Company, Lp Plastic aerosol container and method of manufacture
US9394098B2 (en) 2013-06-28 2016-07-19 Oxygon Technologies Inc. Plastic aerosol containers
US20160264344A1 (en) * 2011-07-08 2016-09-15 S. C. Johnson & Son, Inc. Stable Pressurized System Including Plastic Container And Active(s)-Containing Composition
WO2016161338A1 (en) * 2015-04-01 2016-10-06 Graham Packaging Company, L.P. Structure and method of sealing a closure assembly onto the neck finish of a plastic pressure container
WO2017102250A1 (en) * 2015-12-18 2017-06-22 Unilever Plc Aerosol dispenser
WO2019079092A1 (en) * 2017-10-17 2019-04-25 Graham Packaging Company, L.P. METHOD AND DEVICE FOR MAINTAINING AN INTERNAL DIAMETER OF A PLASTIC CONTAINER
US10661480B2 (en) 2014-11-07 2020-05-26 Mold-Masters (2007) Limited Preform molding system and mold stack for a preform molding system
US11274793B2 (en) 2019-11-27 2022-03-15 Amtrol Licensing, Inc. Composite tank
USD949283S1 (en) * 2019-11-27 2022-04-19 Worthington Industries, Inc. Tank
US11897641B2 (en) * 2016-09-12 2024-02-13 Alpla Werke Alwin Lehner Gmbh & Co.Kg Aerosol container made of plastic

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EP2763912A1 (en) 2014-08-13
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EP2865611A1 (en) 2015-04-29
US20180037399A1 (en) 2018-02-08
CN103826991A (zh) 2014-05-28
US10773875B2 (en) 2020-09-15
MX2019008223A (es) 2019-09-06
CA3076133A1 (en) 2013-04-11
CA3076133C (en) 2021-09-21
PL2763912T3 (pl) 2016-06-30
ES2559463T3 (es) 2016-02-12
CA2851083C (en) 2020-05-12
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EP2763912B1 (en) 2015-12-30
CA2851083A1 (en) 2013-04-11

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