Jeffrey L Greer

US Patent:

60328541, Mar 7, 2000

Filed:

Mar 5, 1998

Appl. No.:

9/035007

Inventors:

Jeffrey P. Greer - Wilmington DE
Quentin W. Howard - Exton PA

Assignee:

International Envelope Company - Exton PA

International Classification:

B65D 2706

US Classification:

229301

Abstract:

A multiple-use, sealable flat envelope has a body of spunbonded olefin sheet. The body has one side edge with a mouth opening and a spunbonded olefin sheet closure flap extends continuously in one piece from the body on one side of the mouth opening. The flap has an inner surface facing and overlapping an edge portion of the body adjoining the mouth opening when the closure flap is folded back toward the body and fully extended over the mouth opening and against the body to close the mouth opening. Two adjoining but separate and spaced apart hot melt, pressure sensitive adhesive closures are provided on the spunbonded olefin sheet of the envelope proximal the mouth opening. One adhesive closure is located farther from the mouth opening than is the remaining adhesive closure. A line of openings through the closure flap extends entirely across the closure flap, the openings being spaced sufficiently closely to one another along the line that a tear force required to break bridges of the spunbonded olefin sheet of the closure flap between adjoining pairs of the openings of the line is less than a tear force required to separate either adhesive closure from the spunbonded olefin sheet supporting the adhesive closure. Where one release liner overlies each of the two adhesive closures, it is divided by a line of weakness extending across the release liner.