Gas barrier laminate and packaging bag
Provided is a gas barrier laminate being capable of hermetic sealing by heat sealing, and having a paper substrate and a vapor-deposited layer, in which the paper substrate has a basis weight of 30 to 100 g/m 2 , the water vapor transmission rate is 3 g/m 2 /d or less at 40° C. and 90% RH, the water vapor transmission rate obtained by folding the gas barrier laminate with the paper substrate placed on the outer side, rolling a roller having a weight of 2 kg thereon one time, opening a fold, and making measurement, is 4 g/m 2 /d or less at 40° C. and 90% RH, and the water vapor transmission rate obtained by folding the gas barrier laminate with the paper substrate placed on the inner side, rolling a roller having a weight of 2 kg thereon one time, opening a fold, and making measurement, is 4 g/m 2 /d or less at 40° C. and 90% RH.
1. A gas barrier laminate being capable of hermetic sealing by heat sealing, the gas barrier laminate comprising:
a paper substrate;
a first resin layer including a first polyolefin resin; and
a vapor-deposited layer disposed between the paper substrate and the first resin layer,
wherein the paper substrate has a basis weight of 30 to 100 g/m 2 ;
a water vapor transmission rate is 3 g/m 2 day or less at 40° C. and 90% RH;
the water vapor transmission rate obtained by folding the gas barrier laminate with the paper substrate placed on an outer side, rolling a roller having a weight of 2 kg thereon one time, opening a fold, and making measurement, is 4 g/m 2 day or less at 40° C. and 90% RH, and the water vapor transmission rate obtained by folding the gas barrier laminate with the paper substrate placed on an inner side, rolling a roller having a weight of 2 kg thereon one time, opening a fold, and making measurement, is 4 g/m 2 -day or less at 40° C. and 90% RH;
a weight of the paper substrate is 47% by mass or more with respect to a gross weight of the gas barrier laminate;
the first resin layer has a first surface and a second surface, and the first surface faces the vapor-deposited layer and the second surface constitutes a surface of the gas barrier laminate; and
the first polyolefin resin has at least one selected from a carboxyl group, a salt of a carboxyl group, a carboxylic acid anhydride group, and a carboxylic acid ester.
2. The gas barrier laminate according to claim 1 , wherein the weight of the paper substrate is 60% by mass or more with respect to the gross weight of the gas barrier laminate.
3. A gas barrier laminate being capable of hermetic sealing by heat sealing, the gas barrier laminate comprising:
a paper substrate;
a first resin layer including a first polyolefin resin; and
a vapor-deposited layer disposed between the paper substrate and the first resin layer,
wherein the paper substrate has a basis weight of 30 to 100 g/m 2 ;
a water vapor transmission rate is 3 g/m 2 day or less at 40° C. and 90% RH;
the water vapor transmission rate obtained by folding the gas barrier laminate with the paper substrate placed on an outer side, rolling a roller having a weight of 2 kg thereon one time, opening a fold, and making measurement, is 4 g/m 2 day or less at 40° C. and 90% RH, the water vapor transmission rate obtained by folding the gas barrier laminate with the paper substrate placed on an inner side, rolling a roller having a weight of 2 kg thereon one time, opening a fold, and making measurement, is 4 g/m 2 ·day or less at 40° C. and 90% RH;
a thickness of the paper substrate is 60% or more with respect to a thickness of the entire gas barrier laminate;
the first resin layer has a first surface and a second surface, and the first surface faces the vapor-deposited layer and the second surface constitutes a surface of the gas barrier laminate; and
the first polyolefin resin has at least one selected from a carboxyl group, a salt of a carboxyl group, a carboxylic acid anhydride group, and a carboxylic acid ester.
4. The gas barrier laminate according to claim 3 , wherein the thickness of the paper substrate is 70% or more of the thickness of the entire gas barrier laminate.
5. The gas barrier laminate according to claim 1 , further comprising a second resin layer including a second polyolefin resin,
wherein the second resin layer is disposed between the paper substrate and the vapor-deposited layer, and the second polyolefin resin has at least one selected from a carboxyl group, a salt of a carboxyl group, a carboxylic acid anhydride group, and a carboxylic acid ester.
6. A packaging bag comprising the gas barrier laminate according to claim 1 , the packaging bag having a heat seal strength of 3 N/15 mm or more.
7. The packaging bag according to claim 6 , having a folded part.
8. The gas barrier laminate according to claim 3 , further comprising a second resin layer including a second polyolefin resin,
wherein the second resin layer is disposed between the paper substrate and the vapor-deposited layer, and the second first polyolefin resin has at least one selected from a carboxyl group, a salt of a carboxyl group, a carboxylic acid anhydride group, and a carboxylic acid ester.
9. A packaging bag comprising the gas barrier laminate according to claim 3 , the packaging bag having a heat seal strength of 3 N/15 mm or more.
10. The packaging bag according to claim 9 , having a folded part.
11. The gas barrier laminate according to claim 1 , wherein the basis weight of the paper substrate is 40 to 80 g/m 2 .
12. The gas barrier laminate according to claim 3 , wherein the basis weight of the paper substrate is 40 to 80 g/m 2 .
13. The gas barrier laminate according to claim 1 , wherein the thickness of the paper substrate is 30 to 100 μm.
14. The gas barrier laminate according to claim 3 , wherein the thickness of the paper substrate is 30 to 100 μm.
15. The gas barrier laminate according to claim 1 , wherein the thickness of the first resin layer is 0.5 to 10 μm.
16. The gas barrier laminate according to claim 3 , wherein the thickness of the first resin layer is 0.5 to 10 μm.
17. The gas barrier laminate according to claim 1 , wherein the first surface of the first resin layer contacts the vapor-deposited layer.
18. The gas barrier laminate according to claim 3 , wherein the first surface of the first resin layer contacts the vapor-deposited layer.
19. The gas barrier laminate according to claim 1 , wherein the first resin layer imparts a heat-sealability to the gas barrier laminate.
20. The gas barrier laminate according to claim 3 , wherein the first resin layer imparts a heat-sealability to the gas barrier laminate.