Adhesive bonding and miscellaneous chemical manufacture – Surface bonding means and/or assembly means therefor – With work cooling means
Reexamination Certificate
2000-02-08
2001-09-18
Sells, James (Department: 1734)
Adhesive bonding and miscellaneous chemical manufacture
Surface bonding means and/or assembly means therefor
With work cooling means
C156S515000, C156S530000, C156S553000, C156S555000, C156S582000, C156S583400
Reexamination Certificate
active
06289961
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATION
This application claims the priority of Swiss Application No. 1999 0234/99 filed Feb. 8, 1999, which is incorporated herein by reference.
BACKGROUND OF THE INVENTION
This invention relates to an apparatus for longitudinally sealing and severing a packaging hose made of a thermoplastic film. The apparatus is intended for use particularly in packing machines.
Swiss Patent No. 527,090 discloses a sealing and severing apparatus for a packing machine. The thermoplastic film hose is obtained by folding it by a hose forming (hose folding) box about two columns of products and subsequently the two superposed films of the packing hose are sealed together lengthwise between the two product columns. Downstream of the cooperating advancing and sealing rollers the thus-formed two parallel hoses are severed from one another by means of a rotating circular knife which cooperates with a circular elastomer counter support.
German Offenlegungsschrift (application published without examination) No. 2,727,960 discloses another sealing and severing apparatus which has a heated circular severing knife. A plate, serving as a counter support, is provided with a longitudinal groove into which the knife projects. Additional advancing components are needed for conveying the film.
SUMMARY OF THE INVENTION
It is an object of the invention to provide an improved sealing and severing apparatus which ensures a rapid sealing and severing of a high-quality welded seam.
This object and others to become apparent as the specification progresses, are accomplished by the invention, according to which, briefly stated, the apparatus for longitudinally welding and severing superposed thermoplastic films forming a packaging hose includes first and second feed rollers each having an outer periphery contacting one another for advancing the films passing therebetween; a drive for rotating at least one of the feed rollers; a circular heating disk mounted in the first feed roller coaxially therewith and having an outer diameter greater than the peripheral diameter of the first feed roller; and a circumferential groove provided in the second feed roller in alignment with the heating disk. Peripheral portions of the heating disk project into the circumferential groove of the second feed roller.
REFERENCES:
patent: 5230761 (1993-07-01), Crawford
patent: 5632831 (1997-05-01), Stull
patent: 5932041 (1999-08-01), Dolling et al.
patent: 527 090 (1972-10-01), None
patent: 27 27 960 (1979-01-01), None
Bausch Gunther
Wipf Alfred
Kelemen Gabor J.
Sells James
SIG Pack Systems AG
Venable
LandOfFree
Apparatus for longitudinally welding and severing a... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus for longitudinally welding and severing a..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for longitudinally welding and severing a... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2549848