Method and machine for filing and sealing a multiwall valve bag

Details Method and machine for filing and sealing a multiwall valve bag Method and machine for filing and sealing a multiwall valve bag

1986-02-18

1987-08-25

Spruill, Robert L.

Package making

Methods

Filling preformed receptacle and closing

53479, 53266R, B65B 104

Patent

active

046883703

ABSTRACT:
The invention is a method and machine for filling and sealing a multiwall valve bag. The bag is fabricated with a valve structure that has at least two separated layers of a polymer composition capable of being heated by electromagnetic energy in the radio frequency range (RF energy). After the bag is filled with a product, the valve structure of the bag is clamped against a set of electrodes that are carrying the RF energy. In a very short time, the polymer layers in the valve structure will absorb enough of the RF energy to join together and thus "heat" seal the filled bag.

REFERENCES:
patent: 3016284 (1962-01-01), Trexler
patent: 3193180 (1965-07-01), Lissner
patent: 3855907 (1974-12-01), Johnson et al.
patent: 4055456 (1977-10-01), Carnegie
patent: 4219054 (1980-08-01), Carter et al.
patent: 4322932 (1982-04-01), McGregor
patent: 4562691 (1986-01-01), Rapparini
patent: 4594835 (1986-06-01), Gray
patent: 4604854 (1986-08-01), Andreas

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