Sheet material and barrier packaging container using the same, and method for fabricating the sheet material

• US 10,457,456 B2
• Filed: 01/14/2016
• Issued: 10/29/2019
• Est. Priority Date: 07/25/2013
• Status: Active Grant

• Current Assignee: Toppan Printing Co., Ltd. (TOPPAN Holdings, Inc.)
• Original Assignee: Toppan Printing Co., Ltd. (TOPPAN Holdings, Inc.)
• Inventors: Nishijima, Nao, Isogai, Akira
• Primary Examiner(s): Pierce, Jeremy R
• Application Number:
  US14/995,472
• Publication Number:
  US 20160130056A1
• Time in Patent Office: 1,384 Days
• CPC Class Codes: B32B 2262/062 Cellulose fibres, e.g. cotton
• CPC Class Codes: B32B 2307/546 Flexural strength; Flexion stiffness
• CPC Class Codes: B32B 2307/7242 Non-permeable
• CPC Class Codes: B32B 2307/7244 Oxygen barrier
• CPC Class Codes: B32B 2307/7246 Water vapor barrier
• CPC Class Codes: B32B 2307/7248 Odour barrier
• CPC Class Codes: B32B 2439/70 Food packaging
• CPC Class Codes: B32B 2439/80 Medical packaging
• CPC Class Codes: B32B 27/12 next to a fibrous or filamentary layer
• CPC Class Codes: B32B 29/02 next to a fibrous or filamentary layer
• CPC Class Codes: B32B 5/022 Non-woven fabric
• CPC Class Codes: B32B 5/024 Woven fabric
• CPC Class Codes: B32B 5/24 one layer being a fibrous or filamentary layer
• CPC Class Codes: B32B 5/245 another layer next to it being a foam layer
• CPC Class Codes: B32B 5/26 another layer next to it also being fibrous or filamentary relative arrangement of fibres or filaments of different layers B32B5/12
• CPC Class Codes: B65D 65/42 Applications of coated or impregnated materials

Abstract

A gas barrier sheet material which make effective use of natural resources and which has improved gas barrier properties including oxygen barrier properties, water vapor barrier properties and smell barrier properties, and improved flexibility; a barrier container using the same; and a method for fabricating a sheet material. A sheet material is characterized in that a fine fiber layer and a moisture-retaining layer are stacked on at least one surface of a substrate in such a way that the fine fiber layer and the moisture-retaining layer are in direct contact with each other. The invention is more advantageous when using a substrate, e.g. paper, a nonwoven fabric, or a porous membrane, of which surface profile is not flat and which is inherently susceptible to causing troubles in fabrication processes, such as of soaking, wetting and drying during coating of a coating agent.

Claims

1. A sheet material, comprising:

a substrate, a fine fiber layer on at least one surface of the substrate, and a moisture-retaining layer also on the at least one surface of the substrate, the fine fiber layer comprising a plasticizer and cellulose nanofibers having an average fiber length of about 1.0 μ

m, wherein the moisture retaining layer is formed by coating an aqueous solution of glycerine that does not contain nanofibers.

2. The sheet material of claim 1, wherein the fine fiber layer and the moisture-retaining layer are in direct contact with each other.

3. The sheet material of claim 1, wherein the moisture-retaining layer and the fine fiber layer are stacked on the substrate in this order.

4. The sheet material of claim 1, wherein the fine fiber layer and the moisture-retaining layer are stacked on the substrate in this order.

5. The sheet material of claim 1 wherein the fine fibers have a width within a range of from 2 nm to 50 nm.

6. The sheet material of claim 1, wherein the substrate is constituted of any of paper, a woven fabric, a nonwoven fabric and a porous membrane.

7. A barrier packaging material that is fabricated using the sheet material of claim 1.