초록 ▼

A bag adapted to be packed with cement or the like by blowing it into the bag through a foldable blow-in port comprises an outer layer of synthetic resin which is impervious to air and moisture and an inner layer of paper bonded to the outer layer by a layer of bonding agent. The surface of the laye

A bag adapted to be packed with cement or the like by blowing it into the bag through a foldable blow-in port comprises an outer layer of synthetic resin which is impervious to air and moisture and an inner layer of paper bonded to the outer layer by a layer of bonding agent. The surface of the layer of the bonding agent facing the paper layer is provided with a plurality of longitudinal grooves which act as exhaust passages for discharging the air blown into the bag.

대표청구항 ▼

In a bag comprising an outer layer of synthetic resin which is impervious to air and moisture, an inner paper layer and a foldable blow-in port provided at one corner of the bag for blowing powdery material into the bag together with air, the opposite ends of the bag being sewed to close the bag, th

In a bag comprising an outer layer of synthetic resin which is impervious to air and moisture, an inner paper layer and a foldable blow-in port provided at one corner of the bag for blowing powdery material into the bag together with air, the opposite ends of the bag being sewed to close the bag, the improvement in the bag wherein said outer layer is bonded to said inner paper layer by means of a layer of a bonding agent which is provided with a plurality of substantially longitudinal grooves on the surface thereof facing said inner paper layer, said grooves extending along the entire length of said bag and constituting exhaust passages.