Vapor deposition paper and method for producing same
AssigneeOji Holdings Corporation
InventorsYasutomo Noishiki, Yuta Shamoto, Misaki Wakabayashi, Miyoko Tanaka
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Abstract
A vapor deposition paper having barrier properties and excellent recyclability. The vapor deposition paper includes a clay coat layer; an undercoat layer; a vapor deposition layer; an overcoat layer; and a heat seal layer in this order on at least one surface of a paper substrate, in which the vapor deposition layer contains at least one of a metal and ceramic and has a thickness of 1 nm or more and 1000 nm or less, and the pulp recovery rate after re-disintegration of the vapor deposition paper is 80% or more.
Claims18
A vapor deposition paper comprising:
- a clay coat layer;
- an undercoat layer;
- a vapor deposition layer;
- an overcoat layer;
- and a heat seal layer in this order on at least one surface of a paper substrate, wherein
- the vapor deposition layer contains at least one selected from the group consisting of metal and ceramic and has a thickness of 1 nm or more and 1000 nm or less,
- the heat seal layer contains a lubricant, and
- a pulp recovery rate after re-disintegration of the vapor deposition paper is 80% or more.
A method for producing a vapor deposition paper having a clay coat layer, an undercoat layer, a vapor deposition layer, an overcoat layer, and a heat seal layer in this order on at least one surface of a paper substrate, the method comprising:
- applying a coating liquid in which a water-suspendable polymer is dispersed in an aqueous medium to form the undercoat layer and the overcoat layer, and
- applying a coating liquid in which a water-suspendable polymer and a lubricant are dispersed in an aqueous medium to form the heat seal layer.
A vapor deposition paper having a coating layer, a vapor deposition layer, an overcoat layer, and a heat seal layer in this order on one surface of a paper substrate, wherein
- the heat seal layer contains a lubricant,
- a Cobb water absorption degree of a surface on a side of the overcoat layer at a temperature of 23° C. for a contact time of 120 seconds measured according to JIS P 8140:1998 is 1.0 g/m2 or less,
- a Cobb water absorption degree of a surface on a side opposite to the side of the overcoat layer at a temperature of 23° C. for a contact time of 120 seconds measured according to JIS P 8140:1998 is 10 g/m2 or more,
- a surface specific electrical resistance of the surface on the side of the overcoat layer measured according to JIS C 2139:2008 is 1.0×1012Ω or more, and
- when a laminated sheet is formed by laminating a 20 μm thick unstretched polypropylene film on the overcoat layer of the vapor deposition paper, an oxygen permeability of the laminated sheet at a temperature of 23° C. and a relative humidity of 50% measured according to JIS K 7126-2:2006 is 2.0 mL/m2·day·atm or less.
Dependencies are inferred from the claim text.