PACKAGING BAG AND DRYING AGENT WITH MOISTURE ABSORPTION INDICATOR FUNCTION

• US 20090022434A1
• Filed: 02/03/2006
• Published: 01/22/2009
• Est. Priority Date: 02/07/2005
• Status: Active Grant

• Current Assignee: Kyodo Printing Company Limited
• Original Assignee: Kyodo Printing Company Limited
• Inventors: Ogawa, Tatsuya, Chiba, Eisuke, Koizumi, Shinichi, Koyama, Hiroshi
• Granted Patent: US 7,887,894 B2
• Time in Patent Office: Days
• US Class Current: 383/109
• 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 packaging bag with a moisture absorption indicator function, characterized in that:

the packaging bag comprises a first packaging material and a second packaging material joined together while an article storage space being formed therebetween;

at least the first packaging material out of the first and second packaging materials includes a transparent barrier film disposed on an outermost side thereof, the transparent barrier film having a barrier property against water vapor;

the second packaging material includes a light-reflective or light-absorbing film and a pattern printed layer disposed on a bag interior side of the light-reflective or light-absorbing film, the pattern printed layer including a moisture absorption indicator pattern; and

at least one of the first and second packaging materials includes a desiccant-containing resin film that becomes transparent due to moisture absorption, the desiccant-containing resin film being overlaid on a part or the whole of the bag interior side of said at least one of the first and second packaging materials.

2. The packaging bag with a moisture absorption indicator function according to claim 1, characterized in that the second packaging material includes a barrier film on an outermost side thereof, the barrier film having a barrier property against water vapor.

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

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

the transparent barrier film comprises a base film that is provided thereon with a silica- or alumina-evaporated film, a multilayer-evaporated film of silica and alumina, a silicon nitride-evaporated film, a coating layer of a barrier paint, or a layer made by coating an evaporated film with a barrier paint; and

the transparent barrier film has a water vapor transmission rate of 0.001 to 100 g/m2/day.

5. The packaging bag with a moisture absorption indicator function according to claim 1, characterized in that:

the light-reflective film is a film having a metallic luster that comprises an aluminum laminate film, an aluminum-evaporated film, an inorganic-evaporated film, or an inorganic oxide-evaporated film; and

the light-reflective film has a water vapor transmission rate of 0.001 to 100 g/m2/day.

6. The packaging bag with a moisture absorption indicator function according to claim 1, characterized in that:

the light-absorbing film comprises a film coated with or containing a light-absorbing material, or a film laminate having a film coated with or laminated with a light-absorbing material; and

the light-absorbing film has a water vapor transmission rate of 0.001 to 100 g/m2/day.

7. The packaging bag with a moisture absorption indicator function according to claim 1, characterized in that:

the pattern printed layer comprises a polyolefin film that is provided on the desiccant-containing resin film or on the light-reflective or light-absorbing film;

the moisture absorption indicator pattern is a pattern including a character, numeral, design or a mixture thereof appropriately combined, which is printed on at least one surface of the polyolefin film; and

the desiccant-containing resin film becomes transparent as a desiccant contained in the desiccant-containing resin film approaches saturation in moisture absorption, to thereby allow visual recognition of the moisture absorption indicator pattern from the inside or outside of the packaging bag.

8. The packaging bag with a moisture absorption indicator function according to claim 1, characterized in that:

the pattern printed layer is provided on the desiccant-containing resin film or on the light-reflective or light-absorbing film;

the moisture absorption indicator pattern is a pattern including a character, numeral, design or a mixture thereof appropriately combined, which is printed on at least one surface of the desiccant-containing resin film or of the light-reflective or light-absorbing film; and

the desiccant-containing resin film becomes transparent as a desiccant contained in the desiccant-containing resin film approaches saturation in moisture absorption, to thereby allow visual recognition of the moisture absorption indicator pattern from the inside or outside of the packaging bag.

9. The packaging bag according to claim 1, characterized in that the desiccant-containing resin film contains at least one desiccant selected from zeolite, silica gel, and alumina.

10. The packaging bag with a moisture absorption indicator function according to claim 1, characterized in that the first packaging material is located on a front side of an article stored in the packaging bag, and the second packaging material is located on a back side of the article.

11. The packaging bag with a moisture absorption indicator function according to claim 1, characterized in that the light-absorbing film is a film printed with black ink, or is a film made of a thermoplastic resin having carbon black mixed therein.

12. The packaging bag with a moisture absorption indicator function according to claim 1, characterized in that the desiccant-containing resin film is mixed or coated with a light-scattering material.

13. The packaging bag with a moisture absorption indicator function according to claim 1, characterized in that the transparent barrier film is coated with a light-scattering material.

14. 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.

15. The drying agent with a moisture absorption indicator function according to claim 14, 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.

16. The drying agent with a moisture absorption indicator function according to claim 14, characterized in that a space is formed between the main desiccant layer and the moisture-absorbing film to provide a bag-like portion.

17. The drying agent with a moisture absorption indicator function according to claim 15, characterized in that a space is formed between the main desiccant layer and the moisture permeability control film to provide a bag-like portion.

18. The drying agent with a moisture absorption indicator function according to claim 14, characterized in that the main desiccant layer comprises a transparent desiccant film or a transparent desiccant molded body.

19. The drying agent with a moisture absorption indicator function according to claim 14, 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.

20. The drying agent with a moisture absorption indicator function according to claim 15, 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.

21. The drying agent with a moisture absorption indicator function according to claim 14, characterized in that the moisture-absorbing film comprises a laminate formed of a desiccant-containing resin layer and a thermoplastic resin.

22. The drying agent with a moisture absorption indicator function according to claim 14, characterized in that the moisture-absorbing film contains at least one desiccant selected from zeolite, silica gel, and alumina.

23. The drying agent with a moisture absorption indicator function according to claim 15, 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.