Sealing method

Details Sealing method Sealing method

1979-01-02

1981-02-03

Hoag, W. E.

Bottles and jars

Closures

Cap type

53488, 215DIG1, 264 23, 264239, B29C 2708, B29C 2500, B29D 900

Patent

active

042483565

ABSTRACT:
The invention provides a method of improving the gastightness of a seal formed between two components consisting of a closure cap applied to seal a container. An ultrasonically vibrating horn is applied to the closure cap to heat the sealing surfaces of the closure cap and container. As the cap and/or container are formed of thermoplastic material, the ultrasonic heating softens the sealing surface of one of the components and causes it to mould into close conformity with the complementary sealing surface of the other component with the effect that the gastightness of the seal between the two is improved. The application of ultrasonic heating energy is discontinued before any significant welding between the two components can occur.

REFERENCES:
patent: 3232470 (1966-02-01), Gibson
patent: 3602257 (1971-08-01), Berleyoung
patent: 3739468 (1973-06-01), Hill
patent: 3773205 (1973-11-01), Keeler et al.
patent: 3784041 (1974-01-01), Birch
patent: 3788509 (1974-01-01), Keeler
patent: 3824138 (1974-07-01), Karobath et al.
patent: 3874635 (1975-04-01), Fletcher et al.
patent: 3911074 (1975-10-01), Kessler
patent: 3920503 (1975-11-01), Keeler
patent: 3947307 (1976-03-01), Buchscheidt
patent: 3948405 (1976-04-01), Yonker
Kish, "How To Ultrasonically Weld the New Engineering Plastics", Plastics Technology, Sep. 1972, pp. 40-42. _
Obeda, Modern Plastics (11-1964) vol. #42, pp. 130-131, 132, 137 & 191. _

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