Packaging bag and drying agent with moisture absorption indicator function

• US 7,887,894 B2
• Filed: 02/03/2006
• Issued: 02/15/2011
• Est. Priority Date: 02/07/2005
• Status: Expired due to Fees

• Current Assignee: Kyodo Printing Company Limited
• Original Assignee: Kyodo Printing Company Limited
• Inventors: Chiba, Eisuke, Koizumi, Shinichi, Koyama, Hiroshi, Ogawa, Tatsuya
• Primary Examiner(s): Miggins; Michael C
• Application Number:
  US11/815,545
• Publication Number:
  US 20090022434A1
• Time in Patent Office: 1,838 Days
• Field of Search: 428/36.7, 428/36.6, 73/290.4, 116/206
• US Class Current: 428/36.6
• CPC Class Codes: B01D 53/261 by adsorption
• CPC Class Codes: B32B 15/08 of synthetic resin
• CPC Class Codes: B32B 15/20 comprising aluminium or copper B32B15/016 and B32B15/017 take precedence
• CPC Class Codes: B32B 2255/10 on synthetic resin layer or on natural or synthetic rubber layer
• CPC Class Codes: B32B 2255/20 Inorganic coating
• CPC Class Codes: B32B 2255/205 Metallic coating
• CPC Class Codes: B32B 2264/10 Inorganic particles
• CPC Class Codes: B32B 2264/102 Oxide or hydroxide
• CPC Class Codes: B32B 2264/104 Oxysalt, e.g. carbonate, sulfate, phosphate or nitrate particles
• CPC Class Codes: B32B 2264/108 Carbon, e.g. graphite particles
• CPC Class Codes: B32B 2307/31 Heat sealable
• CPC Class Codes: B32B 2307/402 Coloured
• CPC Class Codes: B32B 2307/412 Transparent
• CPC Class Codes: B32B 2307/416 Reflective
• CPC Class Codes: B32B 2307/514 Oriented
• CPC Class Codes: B32B 2307/518 bi-axially
• CPC Class Codes: B32B 2307/7246 Water vapor barrier
• CPC Class Codes: B32B 2307/726 Permeability to liquids, absorption
• CPC Class Codes: B32B 2307/728 Hydrophilic
• CPC Class Codes: B32B 2307/75 Printability
• CPC Class Codes: B32B 2439/40 : Closed containers
• CPC Class Codes: B32B 2439/46 : Bags
• CPC Class Codes: B32B 2439/70 : Food packaging
• CPC Class Codes: B32B 2439/80 : Medical packaging
• CPC Class Codes: B32B 27/08 : of synthetic resin
• CPC Class Codes: B32B 27/18 : characterised by the use of special additives
• CPC Class Codes: B32B 27/308 : comprising acrylic (co)polymers
• CPC Class Codes: B32B 27/32 : comprising polyolefins comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30
• CPC Class Codes: B32B 27/36 : comprising polyesters
• CPC Class Codes: B65D 79/02 : Arrangements or devices for indicating incorrect storage or transport B65D79/005 takes precedence ; measuring devices G01
• CPC Class Codes: B65D 81/267 : the absorber being in sheet form
• CPC Class Codes: Y10T 428/1352 : Polymer or resin containing [i.e., natural or synthetic]
• CPC Class Codes: Y10T 428/1379 : Contains vapor or gas barrier, polymer derived from vinyl chloride or vinylidene chloride, or polymer containing a vinyl alcohol unit
• CPC Class Codes: Y10T 428/1383 : Vapor or gas barrier, polymer derived from vinyl chloride or vinylidene chloride, or polymer containing a vinyl alcohol unit is sandwiched between layers [continuous layer]

Abstract

A packaging bag and a drying agent with a moisture absorption indicator function are provided without using a heavy metal harmful to the human body. The packaging bag includes a first packaging material (10) and a second packaging material (20). The first packaging material (10) is provided on an outermost side thereof with a transparent barrier film (12) having a barrier property against water vapor. The second packaging material (20) has a light-reflective or light-absorbing film (24) and a pattern printed layer (23) overlaid on a bag interior side thereof, the pattern printed layer (23) having a printed moisture-absorbing indicator pattern (30). A desiccant-containing resin film (11, 21) which becomes transparent due to moisture absorption is overlaid on a bag interior side of at least one of the first packaging material (10) and the second packaging material (20). The drying agent with a moisture absorption indicator function includes an indicator film layer (70) having a barrier film (75), a pattern printed layer (73) for a moisture absorption indicator, and a moisture-absorbing film (71) containing zeolite, the pattern printed layer (73) and moisture-absorbing film (71) being laminated in this order on the barrier film (75). The drying agent further includes a main desiccant layer (61) and a moisture permeable film (64) that are overlaid on the moisture-absorbing film (71).

Claims

1. A drying agent with a moisture absorption indicator function, characterized in that the drying agent comprises:

an indicator film layer including a barrier film, a pattern printed layer having a moisture absorption indicator pattern printed thereon, and a moisture-absorbing film becoming transparent due to moisture absorption, the pattern printed layer and moisture-absorbing film being laminated in this order on the barrier film;

a main desiccant layer; and

a moisture permeable film, the main desiccant layer and the moisture permeable film being provided on the moisture-absorbing film of the indicator film layer.

2. The drying agent with a moisture absorption indicator function according to claim 1, characterized in that a space is formed between the main desiccant layer and the moisture-absorbing film to provide a bag-like portion.

3. The drying agent with a moisture absorption indicator function according to claim 1, characterized in that the main desiccant layer comprises a transparent desiccant film or a transparent desiccant molded body.

4. The drying agent with a moisture absorption indicator function according to claim 1, characterized in that:

the main desiccant layer comprises a granular or tabular desiccant or a deliquescent desiccant; and

the moisture permeable film and the moisture-absorbing film are sealed together at peripheries thereof to form a bag-like portion that encloses therewithin the granular or tabular desiccant or the deliquescent desiccant.

5. The drying agent with a moisture absorption indicator function according to claim 1, characterized in that the moisture-absorbing film comprises a laminate formed of a desiccant-containing resin layer and a thermoplastic resin.

6. The drying agent with a moisture absorption indicator function according to claim 1, characterized in that the moisture-absorbing film contains at least one desiccant selected from zeolite, silica gel, and alumina.

7. The drying agent with a moisture absorption indicator function according to claim 1, characterized in that a moisture permeability control film is overlaid on the moisture-absorbing film, the moisture permeability control film controlling the time that elapses before moisture absorptiveness of the moisture-absorbing film reaches saturation.

8. The drying agent with a moisture absorption indicator function according to claim 7, characterized in that a space is formed between the main desiccant layer and the moisture permeability control film to provide a bag-like portion.

9. The drying agent with a moisture absorption indicator function according to claim 7, characterized in that:

the main desiccant layer comprises a granular or tabular desiccant or a deliquescent desiccant; and

the moisture permeable film and the moisture permeability control film are sealed together at peripheries thereof to form a bag-like portion that encloses therewithin the granular or tabular desiccant or the deliquescent desiccant.

10. The drying agent with a moisture absorption indicator function according to claim 7, characterized in that the moisture permeability control film is a transparent film and has a water vapor transmission rate of 0.01 to 5,000 g/m2/day.