The present invention relates generally to decorative laminate structures and, more specifically, to a thin laminate sheet constructed of an extruded thermoplastic resin exhibiting certain inventive decorative optical effects, such as in particular translucent monochrome effects with opaque backer, granule effects, metal effects and the like. The laminate sheet is capable of being coiled or rolled to a diameter considerably less than its lesser planar dimension, conveniently packaged and shipped, and adhered at an end location to a rigid substrate.
The prior art is well documented with examples of extruded and decorative articles. The objective in most instances is to provide an attractive surface for use in various structural applications.
A first example of this is set forth in U.S. Pat. No. 6,547,912, issued to Enlow et al., which teaches an extrusion coating process for making a high transparency protective and decorative film. In a first step, a solventless polymeric material is extrusion coated from an extruder die to form an optically clear first layer on a polyester carrier sheet traveling past the extruder die opening. The extrusion coated first layer is cooled and hardened on the carrier sheet, followed by applying a pigmented second layer to the first layer.
The composite paint coat is transferred to a reinforcing backing sheet, after which the carrier sheet is separated from the paint coat to expose the outer surface of the first layer as a high gloss surface with a high distinctness-of-image, providing a transparent protective outer coat for the pigmented second layer. The pigmented second layer can be solvent cast and dried or extruded and hardened as a separate coating on the first layer. The composite paint coat further can be bonded to a coextruded size coat and semi-rigid plastic substrate panel to form a thermoformable laminate.
Additional techniques are disclosed for producing extruded clear films of exceedingly high optical clarity using a closed air flow transport and HEPA filtration system which removes airborne particles from the resin handling and extrusion process, thereby preventing micron-sized contaminants naturally present from any sources from entering the process and degrading ultimate film quality.
U.S. Pat. No. 5,286,528, issued to Reafler, teaches a protective and decorative sheet material for covering a substrate layer and which includes a flexible carrier film, a paint layer adhered to one surface of the carrier film and containing light reflective flakes, and a transparent polymeric top coat overlaying and adhering to the paint layer and having a thickness of at least about 0.1 millimeter. The sheet material exhibits a substantially unstressed relaxed state and a relaxed area and which is heat softenable to a substantially plastic state in which it is extendable to an extended state having an extended area tip to at least 50% greater than the relaxed area.
The paint and topcoat layers exhibit substantially uniform quality and appearance in both the relaxed and extended states. The thick transparent topcoat provides improved retention of gloss and distinctness of image when the sheet material is stretched. A method of preparing the sheet material further includes the step of extruding, in laminar flow, a layer of a cross-linkable transparent topcoat composition over the paint layer.
U.S. Pat. No. 6,206,998, issued to Niazy, teaches a method for making thermoplastic formable sheets laminated with a decorative film, such as one or more layers of glossy clear coat bonded to a layer of pigment containing paint. The method involves providing a thermoplastic formable plastic sheet and applying, on a surface of the plastic sheet, a layer of unsolidified decorative colorant material which forms a decorative first film. Additional steps include curing (if necessary) the decorative material layer to form the adherent first film bonded to the sheet, applying, on the first film, an unsolidified second film for forming a high quality outer surface covering the decorative first film.
Optionally, the decorative sheet may have a first protective layer of thermoformable plastic film removably fixed to the decorative material to protect it from damage during forming of the sheet into a formed part or panel. In auto body trim applications, the formable laminated sheet exhibits a thickness of 0.065″ to 0.30″ and is preferably compression formed with optional thermoforming steps included with, or in place of, compression forming. A second removable protective layer of film may be applied over the first layer to protect against damage prior to compression forming of the sheet.
U.S. Pat. No. 4,810,540, issued to Ellison et al., teaches a flexible decorative sheet material for use in surfacing automobile body panels and the like. The sheet material is characterized by having the appearance of a base coat/clear coat paint finish. The material includes a substantially transparent outer layer, and a pigmented coating on the undersurface of the outer layer which is visible therethrough. The pigmented coating preferably has reflective flakes uniformly distributed therein to import to the sheet material the appearance of a base coat/clear coat paint finish. Also disclosed are shaped articles, which have such sheet materials adhered to one side thereof, and a method for making such sheet materials.
U.S. Pat. No. 6,607,831, issued to Ho et al. teaches a multi-layered article comprising a first layer of a thermoset polyurethane. A second layer of a polymeric composition is bonded to the first layer. The polyurethane has available isocyanate groups prior to the application of the second layer and which is applied onto the first layer in a pre-polymeric or polymeric state wherein the material has carboxyl groups and a cross-linking agent.
Finally, Japanese Patent Publication No. 2003/340948 teaches a lightweight laminated sheet exhibiting high longitudinal and crosswise folding strength. This is obtained by laminating a corrugated fiberboard sheet for combination with the number of corrugation crests of not less than 120 per 30 cm and a corrugation height of not more than 0.6 mm. An attractive decorative printed sheet is applied over the corrugated substrate to complete the assembly
The present invention discloses a thin laminate sheet constructed of an extruded thermoplastic-based matrix resin with embedded granules. The laminate sheet is capable of being coiled or rolled to a diameter considerably less than its lesser planar dimension, conveniently packaged, shipped, uncoiled, sectioned and adhered at an end location to a rigid substrate.
The laminate sheet of material of a preferred embodiment exhibits a substantially translucent viewing surface, combined with at least one substantially opaque interior layer such that the translucent layer is not optically clear and it can be viewed into a depth and not just on its surface. In one embodiment, succeeding layers may be exhibit either of a substantially transparent or a partially opaque visibility, and such substantial opacity that the interior defined layers are not visible to an extent of a first interior layer, however may still permit a small or incremental amount of light to pass therethrough. A substantially opaque resin based material may be coextruded to produce a decorative laminate and which possesses a thickness, in a preferred embodiment, of under 0.100″.
A method of producing a laminate sheet includes the steps of combining volumes of the thermoplastic resin, typically as crushed, ground, or otherwise compounded plastic media, typically in the form of pre-compounded pellets (it being noted that the material may be handled in a virgin state and the necessary ingredients added as needed into the matrix), along with a volume of crushed or otherwise sized granule exhibiting a high aspect ratio (substantially flattened with significantly greater two-dimensional properties). Additional volumes of thermoset resin, minerals, fiber and substantially spherical granules may be admixed with the thermoplastic/granulate recipe in order to modulate the decorative, structural, and rheological aspects of the laminate sheet material.
Additionally, a method or producing and distributing a flexible laminate material for remote installation includes producing a substantially thin and decorative veneer laminate sheet having a specified planar length and width, coiling the sheet about its least planar dimension and to a diameter lesser than said planar dimension, packaging and transporting the laminate sheet, and uncoiling and adhering the sheet to a rigid substrate. The adhesive may be applied to a backside of the decorative laminate material shortly after manufacture of the sheet, in which case the adhesive is covered by a peel-away layer shortly prior to fabrication to a substrate. Alternatively, the adhesive may be cured to a non-tacky state and left uncovered on the rear surface of the sheet. The flexural modulus associated with the decorative laminate further permits it to be applied to, and retained in contact with, an uneven surface associated with the substrate.
Reference will now be made to the attached drawings, when read in combination with the following detailed description, wherein like reference numerals refer to like parts throughout the several views, and in which:
Referring now to
The laminate sheet is constructed of thermoplastic matrix 12, typically provided in pre-compounded and pellet form, combined with a volume of granules 14. The sheet is extruded, according to known manufacturing processes, to its desired and planar length, width and thickness and such that the sheet exhibits at least a substantially transparent or translucent viewing surface, revealing the granules. The granules 14 may further be intermixed with additional liquid pigments and/or colorization to increase the appeal of the decorative laminate thus produced.
The granules are intended to provide a similar or at least compatible flex modulus as compared to the resinous mixture within which the granules are admixed/entrained. Additionally, a coefficient of thermal expansion (CLTE) associated with the selected granules is, in a preferred embodiment, within sixty (60%) percent of a corresponding CLTE associated with the layer of material, e.g. resin, within which it is entrained.
In varying preferred embodiments, granules exhibit high aspect ratios, typically having much greater two-dimensional length and width, and in comparison to very thin thicknesses such as in a range of 0.001″ to 0.008″. In one application, the granules may include material structure including both natural and synthetic polymers such as mica, silica based materials, and formed crystalline structures
The granules may further include at least one of a mineral and a bio-polymer cellulosic film source. As such, the granule surface may exhibit a metallic finish such as gold, silver, aluminum, brass, iron, and rust. It is also contemplated that at least twenty (20%) percent of the granules, by weight, exhibit a mean planar dimension less than 0.150″.
Correspondingly, the thermoplastic resin base, e.g., typically amounting to roughly at least 50% by volume of the laminate recipe, may also be derived from various cellulosic sources (e.g., vegetable, plant, tree, pulp). In the extrusion process for producing the flat planar sheets, additional minor volumes of co-extruded components, such as minerals, thermoset resin, fibers, and the like may be added to adjust the desired structural and decorative aspects of the laminated sheet
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It is also envisioned that, in a further envisioned embodiment, a flexible laminate sheet material can be produced and which includes a first substantially thin layer exhibiting a length, width and thickness, such a layer including at least 50% by volume a thermosplastic resin. Applied to the first layer, such as in co-extruded or otherwise applied fashion, is a second layer within which is exhibited at least 20% by weight of at least one of a mineral, glass, and thermoset resin.
Without further elaboration, it is also envisioned that nanotechnology ingredients, possibly in combination with temperature-controlled extrusion processes may be applied to create the desired resin based layers and which may contain admixed volumes of solid or flowable decorative material. Other manufacturing considerations contemplate reducing an associated coefficient of expansion/contraction to a degree of 30-50% or less between corresponding raw and finished products. Such an article thus created may further include less than 100% opacity in a main (monolith) layer, as well as a desired change or corresponding matching in a given index of refraction between resinous materials corresponding to filler and median layers.
Referring now to
As is further known in the art, the adhesive may be in the form of contact cement or other suitable material which will securely and permanently hold the laminate to the rigid substrate. The rigid substrate may further include any of a wood, polymer or mineral based (gypsum) material.
Referring to
The process steps employed in this particular embodiment include such as 1) creating a desired polymer melt 2) introducing therein a granulate material of desired consistency, 3) extruding into a generally sheet configuration, and/or 4) optionally coextruding at least two layers, at least one of which is substantially opaque. Additional steps include 5) curing the sheet and 6) optionally mechanically abrading, typically in random fashion, the top-most surface of the sheet and optionally slitting the sheet into narrow ribbons suitable for edge band applications.
At step 56, additional strata layers can be coextruded, such as in the form of semi-opaque or substantially transparent layers as previously described. At step 58, the extruded sheet thus produced is cured, set and hardened. At step 60, the laminate sheet is coiled about its lesser planar dimension, packaged and shipped at 62 and, finally, at 64 is uncoiled and adhered to a rigid substrate. A method for producing a flexible laminate material, as well as producing and distributing such a remote material for remote installation, is also disclosed and which embodies steps corresponding to the structure discussed above.
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Another related process application according to the present inventions for making, a decorative thermoplastic-based laminate sheet material, contemplates (pre) coloring at least first and second groups of granulate material, and before they are either entrained, mixed or otherwise combined with the thermoplastic matrix (and such as which may further exist in either a liquid or powdered form) Such coloring may include a homogenous type by admixing colorants into the granule bodies prior to final sizing and most preferably prior to any such sizing. Alternatively, such coloring may take the form of bonding pigments or dyes or a composition of such onto a surface of the granules. Other steps include sizing such that no more than 20%, by weight of a total volume of the granulates to be greater than 0.004″, as well as sizing a further less than 20% by weight to be smaller than 0.5″. Yet additional steps include adding a volume of at least one of a mineral, a thermoset resin, powder, granule, and a fiber to the combined granulates and plastic matrix.
An additional portion of the granulate can be sized to exhibit an aspect ratio of at least 2.0. Additional steps include forming into a sheet a combination of the granulates and plastic matrix, the granulates being dispersed in three dimension within at least one stratum associated with the sheet, and further such that the granulates are suspended within and visually differentiable from the matrix, curing the sheet into a solid form and coiling to a diameter less than 18″, without detrimental affect to its physical properties. In one preferred embodiment, the granules with an aspect ratio greater than two are, by a numerical majority, in contact with the matrix resin they are entrained within on both larger planar sides.
Further process constraints can be managed such that granules below 0.004″ in mean planar diameter substantially do not orient to a parallel alignment with the uppermost surface off the sheet article, and that a numerical majority with an aspect ratio greater than three and larger in mean planar diameter than 0.1 do align in a parallel fashion to at least one surface of the sheet.
Further steps include combining the granulate with the plastic matrix prior to formation and curing of the sheet and evenly distributing the granulates across a surface area associated with said associated stratum. The granulate containing stratum layer can be further dimensioned so as to be at least 0.005 in thickness and can be cured into a solid object having at least 24″ width and a 48″ length planar dimensions. The formed sheet can also be extruded in a thickness range of between 0.010″ to 0.300″.
Other steps include surface activating a rear surface of the sheet in contact with a solid object (such as a rigid substratum as previously described), as well as mechanically abrading a top surface of the cured sheet, particularly if in a non-directional pattern and to a depth of less than 0.05″. This sanding depth contrasts with the prior art of abrasive planning of typical solid surface sheet products of between 0.1″ to 0.2″. Yet additional steps include both applying an at least partially cured and possibly tacky liquid resin to a backside of the formed and cured sheet, as well as separately applying a peel-away layer revealing the liquid resin.
As previously described, the sheet may be formed (such as during coextrusion) to separately include an opaque backer layer, a clear or transparent top layer, or alternatively to include both a transparent layer on top of said translucent layer and at least one opaque layer on the rear surface of said translucent layer. A portion of the granulate may also be orientated, such as within the formed sheet, in order to exhibit a greatest planar dimension larger than 0.10″ parallel to at least one surface of the sheet. In practice the decorative granulate material can also be suspended, such that both of first and second opposite and planar faces of each granule are in contact with the plastic matrix.
An additional variant of the present method further contemplates the steps of producing a substantially thin and decorative veneer laminate sheet having a specified planar length and width, bonding the sheet to a planar substrate material, cutting at least one elongated groove along a rear lacing surface of the substrate and into an adhering surface of the laminate, and without penetrating a laminate outer surface, and filling a groove created thereby with an adhesive and collapsing the groove upon itself to create a finished 90 degree edge. A further process step of heat application along the groove may be used to clear stress-whitening and/or to cure the glue. An additional associated method step contemplates texturing a viewing surface of the laminate sheet with a selected pattern of projections and in order to increase a level of light diffusion of the surface.
It would also be envisioned that one or ordinary skill in the art can further replace the extrusion step in the manufacturing sequence with that of a typical injection molding operation, and it is assumed that these are literal equivalents of each other. Additional non-limiting examples of such processes would include as follows, it being further understood that the several steps or iterations are capable of being employed successively, alternatively, or in combination as dictated by the desires of one of ordinary skill in the art:
1) Providing a polypropylene sheet, such as exhibiting 0.035″ thickness with a translucent top layer of 0.022″ with 10% colored mica granules with an aspect ratio greater than 7; with entrained granules, an opaque backer, of 0.012″ and a cured liquid resin backer of 0.0005″ via a heat oven, the top two layers all formed by co-lamination, and the cured resin by application of a curtain roller;
2) Repeating the above procedure, with the exception of substituting co-lamination of the top 2 layers in favor of a co-extrusion process;
3) Repeating the process of 2), but with the addition of 5% by weight of the translucent layer and removing 3% of the mica granules those being spherical ‘smashed ingot’ granules between 0.002″ and 0.05″ in diameter.
4) Substituting 100% of the mica granulates to additional pigmented granules with silver and sized between 11″ and 0.004″ in order to create high reflectivity;
5) Utilizing a clear granule substrate (e.g., glass, silica, thermoset resin) with an index of refraction to 0.030″ of the resin, into which is entrained a reflective pigment to create mirror chips included in color effect;
6) Utilizing two shades of a similar color to create depth in color;
7) Creating a sheet exhibiting an opaque backer layer at 3.5 times a thickness of an upper layer (such as 0.022″ thick) and in order to create a thermoformable, semi-structural sheet Product.
8) Producing a sheet having a top layer (such as 0.020″ thickness), a bottom layer (such as 0.018″ thickness) the bottom layer being treated with industrially available flame suppressants and the overall product testing to a class A rating (such as according to standard testing parameters known in the relevant industrial art). ASTM E-84
9. Applying a random orbital head sanding operation to a linearly translating (running) sheet, and such that 0.00025″ of surface thickness is removed, the sheet thereby exposing a mineral on its uppermost surface, with improved hardness and wear characteristics;
10. Applying and in-line corona treatment and liquid resin application;
11. Providing a portion of the granulate having a planar size of between 0.3″ and 0.5″ and a thickness of 0.005″, a portion of said granulate volume, such as by weight, being exhibiting a (light) color;
12. Co-extruding or co-laminating all the layers of the sheet such that they exhibit the same color to the naked eye; and
13 Curing the sheet into a solid object having any desired (planar) configuration, such as for example 24″×48″, but also including such steps as curing the sheet into (multiple) ribbons, such as which are each 0.5″ to 1.25″ in width and at least 96″ in length.
Heaving described my invention, other and additional preferred embodiments will become apparent to those skilled in the art to which it pertains, without deviating from the scope of the appended claims.
This Application is a Division of application Ser. No. 11/011,634 filed on Dec. 14, 2004.
Number | Date | Country | |
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Parent | 11011634 | Dec 2004 | US |
Child | 11856853 | Sep 2007 | US |