Plastic bag and closed plastic bag with laser-formed venting per

Details Plastic bag and closed plastic bag with laser-formed venting per Plastic bag and closed plastic bag with laser-formed venting per

1986-07-11

1988-05-10

Marcus, Stephen

Flexible bags

With venting or ventilation means

Opening in bag material

131281, 219121LK, 383109, B65D 3301

Patent

active

047431237

ABSTRACT:
A plastic bag of polyolefin material such as polyethylene, for packaging materials, comprising particles of less than 50 .mu.m, and a closed bag containing such materials and a foil material for such a bag.
The foil wall of the bag is provided with venting apertures with smooth edges, obtained by laser radiation, having a maximum size of 50-100 .mu.m; the distance between the venting perforations is such that the tensile strength of the foil is substantially the same as the tensile strength of the similar non-perforated foil.
In a low density polyethylene foil of a thickness of 130-190 .mu.m distance between the perforations of 80 .mu.m is more than 20 mm, in a linear low density polyethylene foil of about 50-110 .mu.m the perforation distance is at least 5 mm.
The bag may consist of two perforated foil layers, the perforations being staggered with respect to each other.

REFERENCES:
patent: 3226527 (1965-12-01), Harding
patent: 3546327 (1970-12-01), Ruda
patent: 3547340 (1970-12-01), McDonald
patent: 3617702 (1971-11-01), Flournoy
patent: 3628720 (1971-12-01), Lengerich
patent: 3719736 (1973-03-01), Woodruff
patent: 4445993 (1984-05-01), Stutz et al.
patent: 4672684 (1987-06-01), Bames et al.

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