초록 ▼

A laminated wrapping sheet material comprising a layer of paper bonded to a layer of thermoplastic film, is formed such that a layer of paper of 15-35 gsm gauge is discontinuously bonded to a layer of thermoplastic film of 8-35 microns such that pockets of air are defined between the layers. The she

A laminated wrapping sheet material comprising a layer of paper bonded to a layer of thermoplastic film, is formed such that a layer of paper of 15-35 gsm gauge is discontinuously bonded to a layer of thermoplastic film of 8-35 microns such that pockets of air are defined between the layers. The sheet material is useful in the construction of a captive flap bag formed of a paper-thermoplastic film laminate and comprising two superimposed walls with thermoplastic film on the inside, closed at the bottom and on each of the two side edges, and open at the top edge, at least one wall having a reflex internal flap along the top edge sealed at each of the side edges, to define an internal inverted pocket, the two walls not being sealed to each other in the region of the pocket or pockets.

대표청구항 ▼

A laminate wrapping material comprising a sheet of smooth, calendared on at least one side, machine-glazed kraft or sulphite paper in the order of 15 to 35 grams per square meter, and a coextensive sheet of thermoplastic film in the order of 8 to 35 microns in thickness discontinuously attached to e

A laminate wrapping material comprising a sheet of smooth, calendared on at least one side, machine-glazed kraft or sulphite paper in the order of 15 to 35 grams per square meter, and a coextensive sheet of thermoplastic film in the order of 8 to 35 microns in thickness discontinuously attached to each other at regular or irregular intervals along lines of bonding such as to define between the sheets a plurality of channels or pockets on the order of 1 to 5 millimeters in width in the plane of the laminate isolated from one another by said lines of bonding, said paper sheet embodying deadfold characteristics of such magnitude as to impart deadfold characteristics to the composite laminate and said thermoplastic film containing microperforation of such magnitude as to permit transmission of water vapor and hot air through the laminate and to constitute a barrier to the transmission of grease through the laminate and wherein at least some of the microperforations perforate the thermoplastic film into the channels or pockets.