Laminate sheets

• US 4,587,175 A
• Filed: 12/26/1984
• Issued: 05/06/1986
• Est. Priority Date: 12/28/1983
• Status: Expired due to Term

• Current Assignee: Fuji Photo Film Co Limited (Fujifilm Holdings Corporation)
• Original Assignee: Fuji Photo Film Co Limited (Fujifilm Holdings Corporation)
• Inventors: Akao, Mutsuo
• Primary Examiner(s): Thomas, Alexander S.
• Application Number:
  US06/686,385
• Time in Patent Office: 496 Days
• Field of Search: 428/138, 428/139, 428/140, 428/910, 428/219, 428/220, 428/596, 428/134, 428/458, 428/461, 428/463
• US Class Current: 428/596
• CPC Class Codes: B32B 2307/31 Heat sealable
• CPC Class Codes: B32B 2307/516 mono-axially
• CPC Class Codes: B32B 2307/518 bi-axially
• CPC Class Codes: B32B 27/06 as the main or only constituent of a layer, which is next to another layer of the same or of a different material next to a layer of a particular substance B32B9/045; next to a bituminous or tarry layer B32B11/046; next to a water setting substance layer B32B13/12; next to a metal layer B32B15/08; next to a glass layer B32B17/10; next to a layer formed of natural mineral fibres or particles B32B19/045; next to a wood layer B32B21/08; next to a cellulosic plastic layer B32B23/08; next to a natural or synthetic rubber layer B32B25/08
• CPC Class Codes: B32B 3/266 characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12
• CPC Class Codes: B32B 3/30 characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs apertured layer B32B3/266; layer with cavities or internal voids B32B3/26
• CPC Class Codes: B32B 7/12 using interposed adhesives or interposed materials with bonding properties
• CPC Class Codes: G03C 3/00 Packages of films for inserting into cameras, e.g. roll-films, film-packs; Wrapping materials for light-sensitive plates, films or papers, e.g. materials characterised by the use of special dyes, printing inks, adhesives wrapping materials in general B65D
• CPC Class Codes: Y10S 428/91 Product with molecular orientation
• CPC Class Codes: Y10T 428/12361 having aperture or cut
• CPC Class Codes: Y10T 428/24298 Noncircular aperture [e.g., slit, diamond, rectangular, etc.]
• CPC Class Codes: Y10T 428/24339 Keyed
• CPC Class Codes: Y10T 428/24347 From both sides
• CPC Class Codes: Y10T 428/31681 Next to polyester, polyamide or polyimide [e.g., alkyd, glue, or nylon, etc.]
• CPC Class Codes: Y10T 428/31692 Next to addition polymer from unsaturated monomers
• CPC Class Codes: Y10T 428/31699 Ester, halide or nitrile of addition polymer

Abstract

A laminate sheet of at least three layers including a perforated sheet layer, and flexible sheet layers laminated on both sides of the perforated sheet layer wherein:

(a) said perforated sheet layer has a thickness of 0.006 to 1.0 mm and an aperture rate of 10 to 90%,

(b) an adhesive layer is applied on only one of said flexible sheet layers and the other flexible sheet layer is bonded by the adhesive layer extending throughout said apertures, and

(c) said two flexible sheet layers are bonded together through said perforated sheet layer by means of said adhesive layer over an area of 5 to 95% of the overall area.

The perforated sheet layer is formed of a metal foil, paper, unwoven fabrics, cellophane, cloth, and uniaxially molecule-stretched thermoplastic triacetate film or a thermoplastic resin film.

The apertures in the perforated sheet layer have a diameter of 0.5 to 25 mm.

Claims

1. A laminate sheet of at least three layers including a perforated sheet layer, and flexible sheet layers laminated on both sides of the perforated sheet layer wherein:

(a) said perforated sheet layer has a thickness of 0.006 to 1.0 mm and an aperture rate of 10 to 90%,

(b) an adhesive layer is applied on only one of said flexible sheet layers and the other flexible sheet layer is bonded by the adhesive layer extending throughout said apertures, and

(c) said two flexible sheet layers are bonded together through said perforated sheet layer by means of said adhesive layer over an area of 5 to 95% of the overall area.

2. The laminate sheet as defined in claim 1, in which said perforated sheet layer is formed of a metal foil, paper, unwoven fabrics, cellophane, cloth, cellulose triacetate film or a thermoplastic resin film.

3. The laminate sheet as defined in claim 1, in which said apertures in said perforated sheet layer have a diameter of 0.5 to 25 mm.

4. The laminate sheet as defined in claim 3, in which at least one of said flexible sheet layers laminated on both sides of said perforated sheet layer is a heat-sealable layer.

5. The laminate sheet as defined in claim 4, in which said heat-sealable layer is a thermoplastic resin film formed of polyethylenes, polypropylene, nylon, polyester, ethylene-vinyl acetate copolymers, ethylene-acrylate copolymers, polyvinyl chloride or polyvinylidene chloride.

6. The laminate sheet as defined in claim 4, in which at least one of said flexible sheet layers laminated on both sides of said perforated sheet layer is formed of a thermoplastic resin film that is molecule-oriented uniaxially or biaxially.

7. The laminate sheet as defined in claim 6, in which said flexible sheet layers laminated on both sides of said perforated sheet layer are uniaxially molecule-oriented, thermoplastic films which are laminated through said adhesive layer with their orienting axes intersecting at angles of at least 30°

.

8. The laminate sheet as defined in of claim 6, in which, of said flexible sheet layers laminated on both sides of said perforated sheet layer, the layer to come into contact with an article is formed of L-LDPE, and the other layer is formed of uniaxially or biaxially molecule-stretched thermoplastic resin film.

9. The laminate sheet as defined in of claim 6, in which said molecule-oriented film is high-density polyethylene layers having a density of 0.94 g/cm³ or higher with one of the layers having a thickness of 15 to 120 microns inclusive.

10. The laminate sheet for the packaging of photosensitive materials as defined in claim 6, in which one or more layers of said laminate sheet contain a light-shielding material.

11. The laminate sheet for the packaging of photosensitive materials as defined in claim 6, in which said molecule-oriented film is an obliquely molecule-orientated, high-density polyethylene film having a density of at least 0.94 g/cm³, and contains 0.5 to 7% by weight of carbon black.

12. The laminate sheet for the packaging of photosensitive materials as defined in claim 6, in which said heat-sealable flexible sheet layer laminated on the side of said perforated sheet layer to come into contact with an article is formed of a thermoplastic resin layer, has a melting point lower than that of said molecule-oriented film by at least 5°

C. so that it is easily heat-sealable, and contains 0.5 to 15% by weight of a light-shielding material.

13. The laminate sheet for the packaging of photosensitive materials as defined in claim 6, in which said uniaxially molecule-oriented film is a high-density polyethylene film of at least 0.94 g/cm³, that is uniaxially stretched at a magnitude of stretching of 2 to 7 and contains 0.5 to 7.0% by weight of carbon black, and said perforated sheet layer is substantially formed of a thermoplastic resin selected from the group consisting of polyethylenes of LDPE, L-LDPE, MDPE and HDPE, polypropylene, polyester, nylon, EEA, EVA, PVC and PVCD.

14. The laminate sheet for the packaging of photosensitive materials as defined in any one of claims 1 to 10, in which said flexible sheet layers are uniaxially stretched, high-density polyethylene film which have a thickness of 15 to 70 microns with the orienting axes of the layers intersecting at an angle of at least 30°

, and said adhesive layer is formed of a polyolefinic thermo-plastic resin.

15. The laminate sheet as defined in claim 1, which is a material for the packaging of photosensitive materials, and contains 0.5 to 20 g/cm² of a light-shielding material in its entirety.

16. The laminate sheet as defined in claim 1, in which, of said flexible sheet layers thereof, the layer to come into no contact with an article is additionally laminated on the outer surface with a further pliable sheet layer having a heat resistance higher than that of the flexible sheet layer coming into contact with the article by at least 5°

C.

17. The laminate sheet as defined in claim 16, in which said further pliable sheet layer having the higher heat resistance by at least 5°

C. is formed of various types of paper, aluminium-deposited paper, aluminum-deposited thermoplastic resin films, cellophane, unwoven fabrics, cloth or metal foils, each having a thickness of 10 microns or more.

18. The laminate sheet for the packaging of photosensitive materials as defined in claim 17, in which said further pliable sheet layer is a paper layer of 30 to 110 microns as at least one of the light-shielding and heat-resistant layer.

19. The laminate sheet as defined in claim 1, in which the apertures in said perforated sheet layer are substantially in the form of a circle, oval, pillow, triangle with rounded apieces, petal, gourd, coccoon or polygon with the apices being 90°

or more.

20. The laminate sheet as defined in claim 19, in which said apertures are in the form with no apices, or in the form of a circle, oval, pillow, triangle with rounded apices, petal, gourd or coccoon.