Heat-sealable paper and packaging materials

Abstract

To provide a heat seal sheet that does not contain laminate paper and a plastic film of high environmental load and is excellent in water resistance and printability of a non-laminated face of a heat seal layer.SOLUTION: A heat seal sheet relating to an embodiment of the invention includes a paper substrate having pulp as a major component and a heat seal layer laminated on one face of the paper substrate. The heat seal layer has an ethylene (meth) acrylic acid copolymer alkali neutralized product as a major component. The laminated surface of the heat seal layer in the paper substrate has a Bekk smoothness of 5 seconds or more and 50 seconds or less and a Parker print surf smoothness of 3.8 μm or more and 8.0 μm or less. The non-laminated surface of the heat seal layer in the paper substrate has a Bekk smoothness of 50 seconds or more and 500 seconds or less and a Parker print surf smoothness of 2.0 μm or more and 4.2 μm or less. Preferably, the heat seal layer has a coating weight of 1.5 g / m2 or more and 10.0 g / m2 or less.SELECTED DRAWING: None

Claims

1. A paper base material mainly composed of pulp, A heat seal layer laminated on one side of the above paper substrate and It is equipped with, The main component of the heat-seal layer described above is an alkali-neutralized ethylene (meth)acrylic acid copolymer. The content of the ethylene (meth)acrylic acid copolymer alkali neutralized product relative to the total solid content of the above heat seal layer is 90.0% by mass or more. The Beck smoothness of the surface of the heat-seal layer laminated surface of the above paper substrate is 5 seconds or more and 50 seconds or less, and the Parker PrintSurf smoothness is 3.8 μm or more and 8.0 μm or less. A heat-sealable paper having a Beck smoothness of 50 seconds or more and a Parker PrintSurf smoothness of 2.0 μm or more and a Parker PrintSurf smoothness of 4.2 μm or less on the non-laminated surface of the paper substrate described above.

2. The Beck smoothness of the surface of the heat-seal layer laminated surface of the paper substrate is 35 seconds or more and 50 seconds or less, and the Parker PrintSurf smoothness is 3.8 μm or more and 8.0 μm or less. The heat-sealable paper according to claim 1, wherein the Beck smoothness of the surface of the non-laminated surface of the heat-sealable layer in the paper substrate is 260 seconds or more and 500 seconds or less, and the Parker PrintSurf smoothness is 2.0 μm or more and 4.2 μm or less.

3. The coating amount of the above heat seal layer is 1.5 g / m². ２ 10.0g / m or more ２ The heat-sealable paper according to claim 1 or claim 2, wherein the following applies:

4. The heat-seal paper according to claim 1, claim 2, or claim 3, wherein the dynamic water absorption test value after 100 seconds in the dynamic water absorption test of the coated surface of the heat-seal layer, measured using the "Surface Size Tester EST12.2" manufactured by emtec electric, is 85.0% or more and 97.0% or less.

5. The heat-sealable paper according to any one of claims 1 to 4, wherein the Beck smoothness of the surface of the heat-sealable layer is 8 seconds or more and 70 seconds or less, and the Parker PrintSurf smoothness is 3.0 μm or more and 5.3 μm or less.

6. Moisture permeability of 1,800 g / m ２ ・2,000g / m for 24hr or more ２ - Heat-sealable paper according to any one of claims 1 to 5, wherein the heat retention period is 24 hours or less.

7. A packaging material having heat-sealable paper according to any one of claims 1 to 6.

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