FLEXIBLE, FIRE-RESISTANT, DECORATIVE LAMINATES AND METHODS OF MANUFACTURE THEREOF

Abstract: Composite, lightweight, flexible, fire-resistant, decora­ tive laminates (10, 10′, 10″) suitable for use as wall coverings on bulkhead panels in commercial aircraft include: i) a laminar fire-resistant layer (15/14) including an aluminum foil sheet (15) bonded to a first inert polyvinylflouride sheet (14); ii) an underlying flexible paper-like base lamination (II); iii) means (12) for adhesively bonding the first polyvinylflouride sheet (14) to the panel-like base lamination (II); iv) a resinous embossing film (16) overlying and in face-to-face bonded relation to the aluminum foil sheet (15); v) sheet defining means (18, 18′, 18″) having an outer decorative surface and in overlying face-to-face bonded engagement with a re­ sinous embossing film (16); and vi), an outer transparent sheet (21) of clear polyvinylflouride overlying in bonded face-to-face relation with the decorative surface (19, 22) of the sheet defining means (18, 18′, 18″).

Description: FLEXIBLE, FIRE-RESISTANT, DECORATIVE LAMINATES AND METHODS OF MANUFACTURE THEREOF BACKGROUND OF THE INVENTION Technical Field Tile present invention relates generally to composite, flexible, fire-resistant, decorative laminates and methods of manufacture thereof; and, niore particularly, to improved, flexible, fire-resistant, decorative laminates having the characteristics of flexible, fire-resistant wall cuverings which are suitable for use as bulkhead and/or wall panel coverings in the interior passenger compartments of conullercial aircraft and the like. For example, when employed as decorative bulkhead panel coverings in commercial aircraft, it is essential that such coverings be capable of meeting--indeed, exceeding--those standards which are established by regulatory agencies in ternts of fire resistance and reduced emission of smoke and/or toxic funnies such, for example, as those fire standards developed, promulgated, and from tine to time revised by the FAA and which are more conmonly known as Regulation "FAR 25"--standards which are constantly being updated and made more rigourous in terms of those structures that will be approved for use in existing and/or future commercial aircraft. Specifically by way of example, such materials must be capable of meeting, and preferably exceeding, the standards set in Regulation FAR 25.853 wherein the panel is subjected to edge burning by a flame maintained at 15500F for a period of 60 seconds and which requires that tite material be self-extinguishing after 15 seconds and that it be non-dripping. Background Art The present invention arose specifically in connection with the commercial aircraft industry and is intended to meet and exceed minimum fire resistant standards as established by the FAt--standards which are constantly being revised and modified for proposed adoption in connection with existing and/or future aircraft. Tile materials employed and the specific constructional details disclosed for flexible, fire-resistant, interior, decorative wall covering laminates made in accordance with the present invention provide a synergistic result in terms of minimal weight and cost, reduced propensity to emit smoke and/or toxic fumes, increased durability, increased fire resistance and/or fire retardance characteristics, and increased versatility in terms of usage in specific commercial aircraft environments. As is well know, today's coittitercial aircraft are subjected to very stringent requirements in terms of ability to withstand fire and emit minimum quantities of smoke and/or other toxic fumes--standards established by the FAA under Code Regulation "FAR 25". However, this regulatory standard is continuously undergoing review and revision to improve the safety characteristics of the aircraft. The invention is particularly concerned with forming lightweight, flexible, fire-resistant, interior decorative laminates in the form of wall coverings for bulkhead panels and the like in commercial aircraft which will not only meet, but preferably exceed, the standards that are currently in existence and which will enhance the durability of the coverings and improve their fire-resistant characteristics. In conventional aircraft available today, it is a conunon practice to provide decorative wall coverings which are applied to bulkhead panels in the interior passenger compartment, such coverings being made of various types of materials. It itas further been known that where such decorative coverings colllprise a laminar flexible wallpaper or the like, tite incorporation of an aluminum foil barrier film which becontes an integral part of an interior decorative laminate produces a laminate with improved fire-resistant properties. Various efforts have been directed toward producing these types of decorative laminates; but, in general, numerous manufacturing difficulties Stave been encountered. Thus, title aluminum foil sheets which may tend to be as thick as 0.0015" have proven exti-citely difficult to handle without producing wrinkles and/or creases in the foil sheet. Such wrinkles ultimately show up in the finished decorative laminate sheet. In addition, finished decorative laminates including Tedlar--a polyvinylfluoride film made by DuPont--and aluminum foil exhibit less texture than desired; and, when applied to a bulkhead panel , small lines tend to appear from the sweeping operation used duriny application. Numerous approaches have been suggested in the prior art for forming laininar structures having fire-resistant characteristics. Typical of these disclosures are those found in, for example, United States Letters Patents Nos. 3,092,530-Plununer (a heat protective sheathing for missiles employing an aluminum foil lamination); 3,677,882-Jahns, Jr. (an industrial laminate, including, inter alia, a copper foil and a polyvinyiflouride film); 4,105,820-Antoni (a laminate including an aluminum foil sheet and polyethylene films); 4,170,675-Greengrass (superimposed layers of metal foils, plastics and wire mesh); 4,282,276-Smith (a laminate including layers of Kraft paper, fiberglass and aluminum foil); 4,292,353-Ohashi et al and 4,296,170-Ohashi et al (laminates including a uretilane modified polyisocyanurate foam as a core material and an aluminum foil sheet as surface material bonded thereto); 4,395,453-Lines, Jr, et al (a multi-layered laminate including laminations of aluminum and fibrous materials); and, 4,401,707-Bailey et al (a multi-layered fabric including foil/fabric laminations). Other representative patents of interest include United States Letters Patent Nos.: 3,655,426-Fuchs; 3,767,500-Tally et al; 4,054,710-Botsolas; and, 4,054,711-Botsolas all of which disclose various types of laminar structures including, inter alia, one or more sheets of polyvinylflouride and one or more sheets of aluminum foil. Moreover, United States Letters Patent No. 3,616,192-Staclair discloses decorative polyvinylflouride laminations incorporating specific printing ink formulations for providing a decorative image on the polyvinylfluoride film which has desired inert properties. In general, however, the foregoing patents simply do not relate to lightweight, flexible, fire-resistant, decorative laminates of the type employing aluninuln foil sheets wherein provision is nade for enabling the use of relatively thin aluminum foil sheets having thicknesses on the order of appoximately 0.0007" wititout encountering the wrinkling problems generally associated with such foil sìleets, and wherein adhesive bonding of the foil sheets to an underlying flexible panel-like base lamination formed, for example, of paper, is simplified. SUMMARY OF THE INVENTION Composite, lightweight, flexible, fire-resistant, decorative laminates in the form of flexible wall coverings for bulkhead panels in commercial aircraft are disclosed which are characterized by their ability to meet, and exceed, code regulations stablished by tite FIGS such as Regulation "FAR 25"; and, which enable use of relatively thin--c.q., on the order of only 0.0007"-fire-resistant aluminum foil sheets bonded directly to an inert polyvinylflouride film so as to enhance tite ability to adhesively bond the aluminum foil to an underlying flexible paper-like panel or te like while minimizing, and virtually eliminating, the wrinkling problem inherent with the use of such aluminum foil sheets. More specifically, the composite, flexible, fire-resistant, decorative laminates of the present invention include: il a laminar fire-resistant layer including an aluminum foil sheet bonded to a first inett polyvinylflouride sheet; lii an underlying flexible, paper-like base lamination; liii neans for adhesively bonding the first polyvinylflouride sheet to those panel-like base lamination; lij a resinous embossing film overlying and in face-to-face bonded relation to the aluminium foil sheet; v) sheet defining means having an outer decorative surface and in overlying face-to-face bonded engagement with the resinous embossing film; and yii, an outer transparent sheet of clear polyvinylfluoride overlying and in bonded face-to-face relation with the decorative surface of tulle sheet defining means. 'lhe resulting flexible, fire-resistant decorative laminates are characterized by their improved fire-resistant characteristics, reduced smoke and/or toxic fume emission, reduced flame spreading, non-dripping and non-blistering characteristics wiien subjected to flame and/or heat, as by their durability and ease of naintenance in use. TIie invention further relates to improved methods for forming such composite, flexible, fire-resi ,tant, decorative laminates. More specifically, it is a general aim of the present invention to provide improved flexible, fire-resistant, decorative laminates suitable for use as interior wall and/or bulkhead panel coverings in commercial aircraft and the like, and improved methods for manufacture thereof, which permit of incorporation of an interior lamination ot relatively thin fire-resistant aluminum foil without encountering the normal wrinkling problems inherent with handling of such material, and which readily permit bonding of the aluminum foil to an underlying flexible paper or paper-like base lamination; and, wherein the decorative surface of the composite, fire-resistant laminate is protected by an outer lamination of clear, transparent polyvinylflouride, thereby enhancing tie maintenance characteristics of tie laminate in use. A further and more specific objective of the invention is the provision of improved composite, flexible, fire-resistant, decorative laminates and method of manufacture thereof characterized tXy their ability to neet and exceed the fire resistance standards promulgated by the FAR--specifically, Regulation "FAR 25". DESCRIPTION OF THE DRAWINGS These and other objects and advantages of the present invention will become more readily apparent u)on reading the following detailed description and upon reference to the attached drawing, in which: : FIGURE 1 is a fragmentary perspective view of a portion of composite, flexible, fire-resistant, decorative laminate or wall covering embodying features of, and made in accordance with, the present invention, here depicting successive laminations progressively cut away so as to expose portions of tile urldrrlying laminations; FIG. 2 is a side elevational view in diagranatic form here depicting a wall covering embodying the invention having eight (8) discrete laminations and wherein the decorative nurface of the laminate ifi defined by a silkscreened ink image formed on an underlying polyvinylfluoride film or fillet and underlying a superimposed protective sleet or film of polyvinylflouride; and, FIG. 3 is a diagramatic side elevational view similar to FIG. 2, but here depicting a modified form of the invention employing only seven (7) discrete laminations wherein the decorative surface of the composite laminate comprises a photograptl or pLint having a superimposed protective polyvinylflouride coating bonded on the decorative surface thereof. While the invention is susceptible of various modifications and alternative forms, specific embodiments thereof have been shown by way of example in the drawing and will herein be described in detail. It should be understood, however, that it is not intended to limit the invention to the particular forms disclosed; but, to the contrary, the intention is to cover all modifications, equivalents and alternatives falling within the spirit and scope of tite invention as expressed in the appended claims. DETAILED DESCRIPTION Turning now to the drawing, there has been illustrated in FIG. 1, a composite, flexible, fire-resistant, decorative laminate suitable for ure as a wall covering, generally indicated at 10, embodying the features of, and made in accordance with, the present invention. Thus, as here shown, the illustrative laminate 10 includes: i) a flexible, panel-like, base lamination 11 which may Le formed of, for example, paper; jil a superimposed layer 12 of ariy suitable adhesive material; iii) a layer 14 of inert polyvinylflouride adhesively bonded on its undersurface to the adjacent layer 12 of adhesive material; iv) an intermediate layer 15 of relatively thin, fire-resistant aluminium foil--e.g., a layer 15 having a thickness on the order of approximately 0.0007"--v) any suitable all conventional resinuous embossing film 1G disposed in over lying face-to-face bonded engacjemerlt with the aluminum foil lamination 15; and jil, an uppermost or outer exposed decorative sheet 18 which flay itself comprise a laminar structure. In keeping with the present invention, tie lamination 10 depicted in FIG. 1 is preferably formed by initially fabricating, in any suitable and completely conventional sleet lalninating system, an inner laminate comprising a continuous sheet of aluminum foil 15 which is bonded directly to an underlying continuous inert polyvinylfluoride lamination 14. Thus, the arrangement is such that relatively thin and lightweight sheets of fire-resistant aluminum foil 15--for example, sleets on the order of only 0.0007" tijick--are bonded directly to, and in face-to-face relation with, an inert polyvinyiflouride lamination 14 which may be on the order of 0.002" thick so as to form a relatively thin foil/polyvinylflouride laminate 15/14 which can tiien be handled with relative ease during subsequent steps in the overall fabricating process without encountering tlie wrinkling and/or creasing problems inherently faced alien dealing with thin aluminum foil sheets. Moreover, the provision of an inert polyvinylfluoride lamination integral with the aluminum foil facilitates bonding of the laminate 14/15 to an underlying base lamination 11 formed of paper or paper-like material. Having formed the aluminum foil/polyvinylfluoride laminate 15/14, and in keeping with the invention, the continuous, intergral, fire-resistant laminate 15/14 is adhesively bonded to the underlying paper or paper-like base lamination 11 by means of any suitable conventional and compatible adhesive material 12. Thereafter, a conventional resinous embossing film 16 is applied in overlying face-to-face bonded relation to the aluminum foil lamination 15. Finally, any desired exposed flexible decorative sheet, lamination and/or laminate 18 is bonded to the resinous embossing film 16 to form a composite, flexible, fire-resistant, decorative laminate in accordance with, and embodying the features of, the present invention. If desired, those skilled in tiie art will appreciate that the adhesive laminate 12 and paper or paper-like base lamination 11 may sijjply comprise the lower removable paper sheet and intermediate adhesive lamination of any coiiventional, conunercially available paper/adhesive/paper laminate (not shown) from which one outer paper lamination has been removed prior to adhesively bonding title foil/polyvinylfluoride laminate 15/14 to the underlying paper-like base lamination 11. As a consequence of this arrangement, when the flexible, fire-resistant, decorative laminate 10 is to be installed as a wall covering on the interior bulkhead panels of a commercial aircraft or tlie like, it is merely necessary to remove the underlying paper lamination 11 from tie laminate, talus exposing title adtlesive surface 12 which can then be placed in contact with, and adhesively bonded to, the underlying bulkhead panel structure (not shown). Turning next to FIG. 2, there has been illustrated a modified form of composite, flexible, fire-resistant, decorative laminate, generally indicated at 10', which is here shown as consisting of eight (8) discrete laminations as opposed to the six (6) discrete laminations depicted in FIG. 1. In this instance, the outer or exposed decorative sheet 18' itself comprises a laminar construction consisting of: i) a sheet of polyvinylfluoride 19, which may be on the ordcr of 0.002" thick, in overlying, face-to-face, bonded relation to the resinous embossing film 16; iil an image defining lamination 20 lormed, for example, I)y a conventional silkscrecniny process; and iii), an outer protective transparent lamination 21 of clear polyvinylflouride which may, for example, be on ttie order of about 0.001" thick. Thus, the outermost inert polyvinylflouride coating 21 serves to l)rotect the silkscreen image 20 and permits of case of maintenance in use, permitting tite laminate 10' to be wiped or washed without damaging the decorative silkscreened image 20. Referring to FIG. 3, yet another modified form of the invention has been depicted which is similar to those shown in FIGS. l and 2. Titus, as here shown, tic modified laminate, generally indicated at 10", includes seven (7) discrete laminations wherein tite outermost exposed decorative sheet 18" comprises a laminar structure having an inner lamination 22--wijich lay comprise a photograph, print or the like--and an outer, transparent, protective, clear, polyvinyiflouride lamination 21 identical to that previously described in conjunction with FIG. 2. Flexible, fire-resistant, decorative laminates of the type described herein have been produced on a mass-production basis without evidencing any of the problems heretofor encountered widen attempting to form fire-resistant laminates having relatively thin, aluminum foil laminations. The inert foil/polyvittylflouride laminate 15/14 permits of ease of handling during the fabricating process, and permits of formation of desired laminates having excellent decorative characteristics in terms of texture; wijile, at the same time, permitting tite laminate to be applied to bulkhead panels with ease and without producing undesired lines in the finished products. Flame tests performed on panels incorporating the invention have been conducted in accordance witi FAA Fire Code Regulation FAR 25.853; and, sucit tests have demonstrated that the composite, flexible laniinnte fully meets and exceeds the cotje requirements and produces an average burn length of 4.0". While the present invention itas been described in connection with exemplary flexible, fire-resistant, decorative laminates employing laminations of particular described thicknesses, those skilled in the art will readily appreciate that the particular thickness of the various laminations may vary without departing from tite spirit and scope of the invention in its broadest aspects. Thus, while foil laminations 15 of 0.0007" and thicker have been tested widen bonded to polyvinylflourlde fills 14 on the order of 0.002" thick, the invention permits of use of thinner foil and/or polyvinylflouride films if desired. Moreover, tite thickness of the polyvinylflouride films 19 and 21 (See, FIGS. 2 and 3) may readily be increased and/or decreased dependent only upon the end results desired. Suffice it to say that the important features of the invention include the formation of an intermediate fire-resistant metal foil/inert film laminate 15/14 which perniits ease of handling of the metal foil in the fabricatiny process without undue danger of creasing and/or wrinkling of the foil, together with the use of inert materials such as polyvinylflouride to forth a transparent protective coating for the flexible laminate.

Claims: What Is Claimed Is: 1. A flexible, fire-resistant, decorative laminate comprising, in combination: a. a flexible panel-like base lamination; b. a laminar fire-resistant lamination comprising: i) a first sheet of polyvinylflouride adapted to be positioned in face-to-face overlying relation to said flexible panel-like base lamination; and ii), an aluntinum foil sheet overlying said first sheet and bonded thereto; c. means aditesively bonding said first sheet to said flexible paluel-like base lamination; d. a resinous embossing film overlying and in face-to-face bonded relation to said aluminum foil sheet; and, e. a laminar decorative sleet overlying and in face-to-face bonded relation to said resinous embossing film, said laminar decorative sheet comprising: iii) sheet defining means having an outer decorative surface and in face-to-face bonded engagement with said resinous embossing film; and iv), an outer transparent sheet of clear polyvinylfluoride overlying and in bonded face-to-face relation with said sheet defining means and forming tite outer exposed surface of said flexible, file-resistant, decorative laminate. 2. A flexible, fire-resistant, decorative laminate as set forth in Claim 1 wherein said sheet defining means having an outer decorative surface comprises a third sheet of polyvinylflouride having a silkscreened image applied thereto and wherein said second sheet of clear polyvinylflourioe is bonded to, and Ijt face-to-face overlying relation with, said third sheet of polyvinylflouride witit said silkscreened image sandwiched therebetween. 3. A flexit,le, fire-resistant, decorative ruminate as set forth in Claim 1 wherein said sheet defining means having an outer decorative surface comprises a photograph. 4. A flexible, fire-resistant, decorative laminate as set forth in Claim 1 wherein said sheet defining means having an outer decorative surface comprises a flexible sheet having a decorative print forned on its outer surface. 5. A flexible, fire-resistant, decorative laminate as set forth in Claims 1, 2, 3 or 4 wherein said first sheet of polyvinylflouride is on the order of 0.0002" thick. 6. A flexible, fire-resistant, decorative laminate as set forth in Claims 1, 2, 3 or 4 wherein said aluminum foil sheet is on the order of 0.00()i" thick. 7. A flexible, fire-resistant, decorative laminate as set forth in Claims 1, 2, 3 or 4 wherein said first sheet of polyvinylflouride is on the order of 0.002" thick and said aluminum foil sheet is on tiie order of 0.0007" thick. 8. A flexible, fire-re iistant, decorative laminate as set forth in Claims 1, 2, 3 or 4 wherein r;aid flexible panel-like base lamination is fornsed of paper. 9. A flexible, fire-resistant, decorative laminate as set forth in Claims 1, 2, 3 or 4 wherein said outer transparent sheet of clear polyvinylfluoride is on the order of 0.001" thick. 10. A flexible, fire-resistant, decorative laminate as set forth in Claim S wherein said outer transparent second sheet of clear polyvinylfluoride is on the order of 0.001" thick. 11. A flexible, fire-resistant, decorative nlinate as set for tit in Claim 6 wherein said outer transparent second sheet of clear polyvinylflouride is on the order of 0.001" thick. 12. A flexible, fire-resistant, decorative laminate as set forth in Claim 7 wherein said outer transparent second sheet of clear polyvinylflouride is on tite order of 0.001" thick. 13. A flexible, fire-resistant, decorative laminate as set forth in Claim 2 wherein said third sheet of polyvinylflouride is on the order of 0.002" thick. 14. A flexible, fire-resistant, decorative laminate as set forth in Claim 13 wherein said first sheet of polyvinylflouride is on the order of 0.002" thick. 15. A flexible, fire-resistant, decorative laminate as set forth in Claim 13 wherein said aluminum foil sheet is on the order of 0.0007" thick. 16. A flexible, fire-resistant, decorative laminate as set forth in Claim 13 wherein said first sheet of polyvinylflouride is on the- order of 0.002" thick and said aluminum foil sheet is on the order of 0.0007" thick. 17. 'flte method of forming a composite, flexible, fire-resistant, decorative laminate comprising tie steps of: a. forming a laminar fire-resistant laminate by bonding an aluminum foil sheet in face-to-face overlying relation to a first sheet of polyvinylflouride; b. adhesively bonding the first sheet of polyvinylflouride to a flexible panel-like base lamination; c. bonding a resinous embossing film to, atid in face-to-face overlying relation with, tite aluminum foil sheet; d. bonding sheet defining means having an outer decorative surface to, and in face-to-face overlying relation with, the resinous embossing film; and, e. bonding an outer transparent second sheet of clear polyvinylflouride to, and in face-to-face overlying relation with, the outer decorative surface of tite sheet defining means so as to form a transparent, protective, outer exposed surface on tite composite, flexible, fire-resistant, decorative laminate. 18. The method of forming a composite flcxjIjle, fire-resistant, decorative laminate as set forth in Claim 17 wherein the sheet defining means liavittg an outer decorative surface comprises a third sleet of polyvinylflouride having a silkscreened image applied thereto anc3 wherein title second sheet of clear polyvinylflouride is bonded to, and in face-to-face overlying relation with, the titird sheet of polyvinylflouride witit the silkscreened image sandwiched therebetween. 19. The method of forming a composite flexible, fire-resistant, decorative laminate as set forth iti Claim 17 wherein the sheet defining Itteans Slaving an outer decorative surface comprises a photograph. 20. The method of forming a composite flexible, fire-resistant, decorative laminate as Let for tit in Claim 17 wherein the sheet defining means staving an outer decorative surface comprises a flexible sheet having a decorative print formed on its outer surface. 21. The method of forming a composite flexible, fire-resistant, decorative laminate as set forth in Claims 17, 18, 19 or 20 wherein the first sheet of polyvinylflouride is on ttie order of 0.002" thick. 22. The method of forming a composite flexible, fire-resistant, decorative laminate as set forth in Claims 17, 18, 19 or 20 wherein the aluminum foil sheet is on the order of 0.0007" thick. 23. TIte method of forming a composite flexible, fire-resistant, decorative laminate as set forth in Claims 17, 18, 19 or 20 wherein the first sheet of polyvinylflouride is on the order of 0.002" thick and the aluminum foil sheet is on tie order of 0.0007" thick. 24. The method of forming a composite flexiltie, fire-resistant, decorative laminate as set for tit in Claims 17, 18, 19 or 20 wherein the outer transparent second sheet of polyvinylfluoride is on the order of 0.001" thick. 25. The method of forming a composite flexible, fire-resistant, decorative laminate as ret forth in Claim 21 wherein the outer transparent second Litret of polyvinylfluoride is Oil tite order of 0.001" titi(k. 26. The metltod of forming a composite flexible, fire-resistant, decorative laminate as set forth in Claim 22 wherein the outer transparent second sheet of polyvinylflouride is on the order of 0.003" thick. 27. The method of forming a composite flexible, fire-resistant, decorative laminate as set forth in Claim 23 wherein title outer transparent second sheet of polyvinylflouride is on the order of 0.001" thick. 28. The method of forming a composite flexible, fire-resistant, decorative laminate as set forth in Claim 18 wherein the third sheet of polyvinylflouride is on the order of 0.002" thick. 29. The method of forming a composite flexible, fire-resistant, decorative laminate as set for Lit in Claim 28 wherein the first sheet of polyvinylflouride is on the order of 0.002" thick. 30. The method of forming a composite flexible, fire-resistant, decorative laminate as set fort it in Claim 28 wherein the aluminum foil sheet is on the order of 0.0007" thick. 31. The method of forming a composite flexible, fire-resistant, decorative laminate as set forth in Claim 28 wherein the first sheet of polyvinylflouride is on the order of 0.002" thick and tite aluminum loil sheet is on tite order of 0.0007" Liti('k.

Inventors: COLE, BERTON ARTHUR, KOWALSKI, JOSEPH CHESTER, MOTTAZ, DONALD ARTHUR
Applicants: THE BOEING COMPANY
Application year: 1985
Main classification: B32B27
IPC codes: B44C5, B32B27