Laminated sheet for lid body, lid body, food packaging container and packaged food

Abstract

To provide a lid body used on food packaging containers, which contains a paper base material, is of low environmental impact, and has both blocking resistance and heat sealability.SOLUTION: A laminated sheet for lid body is provided, which is used for a lid body of a food packaging container that has a container body with an opening and a lid body that covers the opening, and which includes, in this order, a water-resistant functional layer, a paper base material, a support layer, and a heat seal layer. In the above-mentioned laminated sheet for lid body, the heat seal layer contains an ethylene-vinyl acetate copolymer and a fatty acid amide additive, the intensity ratio (I2 / I1) of the peak intensity due to the C=O stretching vibration of the ethylene-vinyl acetate copolymer present in the range of 1700 to 1800 cm-1 and the peak intensity (I2) due to the N-H stretching vibration of an amino group contained in the fatty acid amide additive present in the range of 3200 to 3500 cm-1 satisfies 0.007≤I2 / I1<0.1.SELECTED DRAWING: Figure 1

Claims

1. A laminated sheet for a lid used for a lid of a food packaging container having a container body with an opening and a lid covering the opening, the laminated sheet comprising, in this order, a water-resistant functional layer, a paper base material, a support layer, and a heat seal layer; The heat seal layer contains an ethylene-vinyl acetate copolymer and a fatty acid amide additive, and has an infrared absorption spectrum obtained by Fourier transform infrared spectroscopy analysis using a total reflection measurement method on the surface opposite to the support layer, the infrared absorption spectrum having a wavelength of 1700 to 1800 cm －１ The peak intensity (I １ ) and 3200 to 3500 cm －１ The peak intensity (I ２ ) and the intensity ratio (I ２ / I １ ) satisfies the following formula (1): 0.007≦I ２ / I １ <0.1 (1)

2. 2. The lid laminate sheet according to claim 1, wherein the heat seal layer further contains particles having an average particle size of 40 [mu]m or less.

3. 3. The lid laminate sheet according to claim 2, wherein the content of the particles in the heat seal layer is 11% by mass or less.

4. The laminate sheet for a lid body according to claim 1, wherein when layers other than the paper base material contained in the laminate sheet for a lid body are classified into layers made of plastic and other layers, the mass of the paper base material is greater than the total mass of the layers made of plastic and the total mass of the other layers.

5. The laminate sheet for a lid body according to claim 1 , further comprising a printed layer between the water-resistant functional layer and the paper base material, and further comprising a gas barrier layer between the printed layer and the heat seal layer.

6. 2. The lid laminate sheet according to claim 1, wherein the paper base material is a coated paper having a coating layer on at least one surface thereof.

7. The ethylene-vinyl acetate copolymer contained in the heat seal layer has a glass transition temperature of -40°C or higher and a melting point within the range of 40 to 100°C.

8. 2. The lid laminate sheet according to claim 1, wherein the heat seal layer is a cured film of a coating film made of heat seal varnish.

9. The lid laminate sheet according to claim 1 , wherein the heat seal layer contains a secondary amide as the fatty acid amide-based additive.

10. 10. The lid laminate sheet according to claim 9, wherein the heat seal layer contains N-oleyl palmitamide as the secondary amide.

11. 2. The lid laminate sheet according to claim 1, wherein the heat seal layer has a thickness in the range of 2.5 to 5.5 [mu]m.

12. A lid comprising the laminate sheet for a lid according to any one of claims 1 to 11.

13. A food packaging container comprising a container body having an opening and a lid body as described in claim 12 that covers the opening, wherein the support layer is disposed between the paper base material and the internal space of the food packaging container.

14. 14. The food packaging container according to claim 13, wherein the container body has a flange around the opening, and the lid body is heat-sealed to the flange via the heat-seal layer.

15. 14. The food packaging container according to claim 13, wherein the internal space of the food packaging container is filled with a mixed gas containing oxygen gas, nitrogen gas, and carbon dioxide gas.

16. The food packaging container according to claim 13, wherein the food packaging container is a chilled food packaging container or a frozen food packaging container.

17. A packaged food comprising the food packaging container according to claim 13 and food contained in the food packaging container.

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