Machine for manufacturing square bags of thermoplastic film

Details Machine for manufacturing square bags of thermoplastic film Machine for manufacturing square bags of thermoplastic film

1974-08-21

1976-08-17

Coan, James F.

93 8R, 93 27, B31B 184

Patent

active

039747476

ABSTRACT:
A square bag consisting of a tubular body made of thermoplastic film with its outer surface processed to be hardly weldable and a couple of rectangular closures made of thermoplastic film for closing the top and bottom openings of said body, said tubular body being flat when empty and the top and bottom openings of said body being formed into the front and rear horizontal flaps spreading horizontally and a pair of bisymmetric triangular end plates lapped over two sides of said flaps by pressing said openings vertically, which bag is characterized in that the top closure consists of a valve plate and a cover plate, one side edge of both plates is inserted beneath said triangular end plates, respectively, to overlap each other and heat-sealed, the other side edge of said cover plate extends over the other side edge of said valve plate to form a valve lip, the overlapping portions of the front and rear side edges of the valve plate and the cover plate and the front and rear side edges of the horizontal flaps of the top of the body are heat-sealed, and further the bottom closure consists of one cover plate which is installed on the bottom opening in the same fashion as said top closure and the overlapping portions of the body and said cover plate are heat-sealed.

REFERENCES:
patent: 2559873 (1951-07-01), Grupe et al.
patent: 3250187 (1966-05-01), Kasting
patent: 3853040 (1974-12-01), Achelpohl

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