Method of manufacturing a plastic aerosol container having plastic end closures
First Claim
1. A method for manufacturing a container (10) suitable for dispensing pressurized products and comprising an extruded seamless plastic body portion (14) capable of withstanding pressures associated with the product to be dispensed, the body portion have protuberances (70) at each end, and plastic end closure members (12, 16) each having an annular recess (28, 54) with an undercut (32, 58) for receiving the respective end (30, 56) and protuberance (70) of the body portion (14) and thereby forming a fluid tight seal between the body portion (14) and the end closure members (12, 16), characterized in that the protuberances (70) on the ends (30, 56) of the tubular body portion (14) are formed in situ in said recesses (28, 54) by heating said ends to flow the plastics of the tubular body portion (14) into said undercuts (32, 58).
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Abstract
Broadly stated, this invention comprises a pressure container having an extruded plastic body portion and plastic end closures for the body portion, each end closure having a recess portion for receiving the respective ends of the body portion. In a preferred embodiment one of the closures is adapted to receive a conventional aerosol valve having a mounting cup for clinching onto the said closure. In a still further preferred embodiment, the non-valved closure has a port for bottom gassing of the container when the product to be discharged and the propellant are separated by a piston.
65 Citations
23 Claims
- 1. A method for manufacturing a container (10) suitable for dispensing pressurized products and comprising an extruded seamless plastic body portion (14) capable of withstanding pressures associated with the product to be dispensed, the body portion have protuberances (70) at each end, and plastic end closure members (12, 16) each having an annular recess (28, 54) with an undercut (32, 58) for receiving the respective end (30, 56) and protuberance (70) of the body portion (14) and thereby forming a fluid tight seal between the body portion (14) and the end closure members (12, 16), characterized in that the protuberances (70) on the ends (30, 56) of the tubular body portion (14) are formed in situ in said recesses (28, 54) by heating said ends to flow the plastics of the tubular body portion (14) into said undercuts (32, 58).
- 19. A plastic aerosol container suitable for dispensing pressurized products comprising an extruded seamless plastic body portion capable of withstanding pressures associated with the product to be dispensed without distortion, a first plastic end closure adapted to receive a conventional aerosol valve having a mounting cup for clinching onto the first plastic end closure and a second concave end closure capable of withstanding the pressure within the aerosol container, each of said plastic end closures having a recess for receiving the respective ends of the body portion and further having an undercut at the base of at least one sidewall of the recess, the ends of the plastic body portion within the respective recesses and the respective end closures being sealingly joined through melting of the body portion contiguous to the undercut to form a bead in the respective undercuts of the end closures.
Specification