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 for dispensing liquid or semi-liquid contents by internal gaseous pressure, i.e. aerosol containers comprising propellant
  • B65D83/38—Details of the container body
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
  • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
  • C08L23/04—Homopolymers or copolymers of ethene
  • C08L23/08—Copolymers of ethene
  • C08L23/0807—Copolymers of ethene with unsaturated hydrocarbons only containing four or more carbon atoms
  • C08L23/0815—Copolymers of ethene with unsaturated hydrocarbons only containing four or more carbon atoms with aliphatic 1-olefins containing one carbon-to-carbon double bond
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
  • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
  • C08L23/04—Homopolymers or copolymers of ethene
  • C08L23/06—Polyethene

Definitions

• Aerosol dispensing containers have found widespread use in the packaging of fluid materials including a variety of both liquid and powdered particulate products. Such containers are provided with a valve-controlled discharge orifice and operate by the action of a volatile propellant which is confined within the container together with the product to be dispensed. Because the propellant has an appreciable vapor pressure at room temperature, the product in the closed container is maintained under superatmospheric pressure.
• the protrusions are formed by a tool placed around, the pedestal of the mounting cup, which forces out particular sections of the skirt of the cup.
• aerosol containers are typically filled by the undercap filling method. First, the product to be dispensed is deposited into the container. Then a mounting cup, including the valve and dip tube, is placed on the container such that the bead of the container is within the channel of the mounting cup. The filling head of an undercap filling machine then encompasses the top of the container, creating an airtight seal. Air is then evacuated from the container. The suction created during evacuation raises the mounting cup off of the container bead.
• the seal between the mounting cup and the aerosol container remains of great concern to both the valve assembly plants and the filling plants since it must be capable of being air tight for a period of years.
• the seal between the mounting cup and the aerosol container must be low in cost to enable aerosol products to be competitive with non-aerosol products in the consumer market.
• a gasket for sealing a channel of a mounting cup to a bead of a container comprises a mixture of a stiffer plastic material and a softer plastic material which mixture meets the flexural modulus and hardness limits described above.
• the gasket is preferably a sleeve type gasket and the plastic materials are thermoplastics.
• the gasket material comprises a mixture of high density polyethylene (“HDPE”) and linear low density polyethylene (“LLDPE”) .
• the * preferred HDPE is about 43% by weight of the gasket and the 5 preferred LLDPE is about 57% by weight of the gasket.
• Figure la is a cross-sectional view of the channel of the gasketed mounting cup of Figure 1, clinched to a container bead;
• Figure 2 is a cross-sectional view of a portion of a gasket prior to its being advanced into the channel of a mounting cup; and Figure 3 is a cross-sectional view of a portion of the punch preferred for use in manufacturing the gasketed mounting cup of the present invention.
• Figure l shows a gasketed aerosol valve mounting cup of the present invention generally designated as 10 resting on a container bead 12 of an aerosol container (not shown) .
• Figure la shows the channel portion 20 of the gasketed mounting cup 10 clinched to the container bead 12.
• the mounting cup has a pedestal portion 14 which depends from the interior edge of a panel portion 16.
• a skirt 18 depends from the exterior edge of the panel portion 16 opposite the pedestal portion 14 and is concentric thereto. The top portion of the skirt 18 curves into an annular channel portion 20 which terminates in an edge portion 22.
• the length "L- 2" of the gasket material after being cut from the sleeve is the length "L- 2" of the gasket material after being cut from the sleeve
• the plastic is preferably a thermoplastic polymer.
• Sleeve gaskets are preferably positioned in accordance with the process described in the '525 and '948 patents, and U.S. Serial No. 07/814,370.
• Thermoplastics are preferred for use with sleeve gaskets because they soften when heated, easing placement within the channel of the mounting cup, and harden on cooling, retaining their shape conforming to the channel of the cup.
• Suitable thermoplastic materials include polyethylenes, polypropylenes, other polyolefinic compounds such as -12-
• the relative quantity of the softer and stiffer plastic materials combined to form the mixture having the characteristics described above depends on their softness and stiffness. For example, if the soft material and stiff material are each close to the desired hardness and flexural modulus values, mixtures of between about 60% of one to 40% of the other may be utilized to yield mixtures having the characteristics of hardness and flexural modulus described above. If either or both of the hardness and flexural modulus values of either material are far from the desired values, larger quantities of one material may be required to yield the desired values in the mixture. For example, mixtures of between about 60%-70% of one to about 40%-30% of the other, about 70%-80% of one to about 30%-20% of the other or even greater than 80% of one and less than 20% of the other, may be utilized.
• the preferred stiffer material is HDPE having a flexural modulus of at least about 140,000 psi. A higher flexural modulus is even more preferred.
• the preferred HDPE is
• a one piece punch 30 is preferred for advancing the gasket 24 into the channel 20 of the mounting cup.
• the punch preferably includes an extension 30a for engaging the end of the first portion 24a of the gasket 24 as it is being advanced into the channel 20 of the mounting cup 10 as shown in Figure 3.
• the extension 30a ensures that the gasket is advanced to its preferred position within the channel 20 of the cup, yielding the preferred gasket flare d, as shown in Figure 1.
• a shoulder 34 is provided to engage the top of the second portion 24b of the gasket 24 and to advance the gasket to its final position.
• the punch further includes a series of lugs 32 formed by pins 32a pressfit into the punch 30. These lugs form the dimples 26 shown in Figure 1 and described further in U.S. Serial No. 07/814,370. Further details concerning the process and preferred punch utilized in manufacturing the gasketed mounting cup of the present invention are described in U.S.S.N. 07/814,370.

Landscapes

• Chemical & Material Sciences (AREA)
• Dispersion Chemistry (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Health & Medical Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Medicinal Chemistry (AREA)
• Polymers & Plastics (AREA)
• Organic Chemistry (AREA)
• Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
• Closures For Containers (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=25214199

Family Applications (1)

Country Status (10)

Families Citing this family (1)

Citations (2)

Family Cites Families (8)

• 1992
  • 1992-12-07 ZA ZA929464A patent/ZA929464B/xx unknown
  • 1992-12-09 GB GB9225688A patent/GB2262742A/en not_active Withdrawn
  • 1992-12-14 MX MX9207246A patent/MX9207246A/es not_active Application Discontinuation
  • 1992-12-22 PT PT101150A patent/PT101150A/pt not_active Application Discontinuation
  • 1992-12-23 CA CA002130352A patent/CA2130352A1/en not_active Abandoned
  • 1992-12-23 AU AU34201/93A patent/AU3420193A/en not_active Abandoned
  • 1992-12-23 WO PCT/US1992/011184 patent/WO1993012901A1/en not_active Application Discontinuation
  • 1992-12-23 EP EP93902734A patent/EP0618848A4/en not_active Withdrawn
  • 1992-12-24 CN CN 92115376 patent/CN1078423A/zh active Pending
  • 1992-12-24 TW TW081110355A patent/TW245666B/zh active

Patent Citations (2)

Non-Patent Citations (2)

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