ARCHITECTURAL RESIN PANEL WITH INCORPORATED SCRAP MATERIALS

Abstract

An architectural resin panel that incorporates plastic granules fused together to form a panel core. A portion of the plastic granules are contaminant granules that at least partially include a contaminant material, such as a piece of fabric, plastic film, or plant material. The granules used to form the panel core may be sourced from waste plastic material that would otherwise be required to undergo waste processing.

Claims

1. An architectural resin panel, comprising: a plurality of plastic granules fused together to form a panel core, wherein the plurality of plastic granules includes contaminant-free granules, and contaminant granules, wherein the contaminant granules at least partially comprise a contaminant material and the contaminant-free granules omit the contaminant material.

2. The architectural resin panel of claim 1, wherein the plurality of plastic granules comprise one or more of polyethylene terephthalate (PET), polyethylene terephthalate with glycol-modification (PETG), acrylonitrile butadiene-styrene (ABS), polyvinyl chloride (PVC), polyvinyl butyral (PVB), ethylene vinyl acetate (EVA), polycarbonate (PC), styrene, polymethyl methacrylate (PMMA), polyolefin (UHMW or HDPE or LDPE or PP), thermoplastic polyurethane (TPU), a cellulose-based polymer, polylactic acid (PLA), or polyhydroxyalkanoate (PHA).

3. The architectural resin panel of claim 1, wherein the contaminant material comprises one or more of plastic film, fabric, or plant material.

4. The architectural resin panel of claim 1, wherein the contaminant material comprises opaque plastic film, and wherein a majority of contaminant granules including an opaque plastic film include white plastic film.

5. The architectural resin panel of claim 1, wherein the plastic granules have an average granule size of about ⅛ inch to about ½ inch.

6. The architectural resin panel of claim 1, wherein about 1% to about 12% of the plastic granules are contaminant granules, the remaining plastic granules being contaminant-free granules.

7. The architectural resin panel of claim 1, further comprising one or more skin layers fused to the panel core.

8. The architectural resin panel of claim 7, wherein the one or more skin layers are formed from the same plastic material as the plurality of plastic granules.

9. The architectural resin panel of claim 1, wherein the contaminant granules make up about 1% to about 10% of the overall weight of the panel.

10. The architectural resin panel of claim 1, wherein contaminant-free granules are substantially transparent.

11. The architectural resin panel of claim 10, wherein borders between the fused plastic granules are visible.

12. The architectural resin panel of claim 1, wherein the panel has an optical transmission to visible light of about 50% to about 85%.

13. An architectural resin panel, comprising: a plurality of plastic granules fused together to form a panel core, wherein the plurality of plastic granules includes contaminant-free granules that are substantially transparent, and contaminant granules that include an opaque plastic film contaminant material, wherein about 1% to about 12% of the plastic granules are contaminant granules.

14. A method of manufacturing an architectural resin panel, comprising: granulating waste plastic material to form an initial set of plastic granules; sorting the initial set of plastic granules to form a set of reject granules and a set of accept granules, wherein a majority of the reject granules are contaminant granules at least partially comprising a contaminant material, and wherein the accept granules comprise contaminant-free granules and about 12% or less contaminant granules; and fusing the accept granules together to form a panel core.

15. The method of claim 14, wherein the contaminant material comprises one or more of plastic film, fabric, or plant material.

16. The method of claim 14, wherein the waste plastic material is granulated such that the initial set of plastic granules has an average granule size of about ⅛ inch to about ½ inch.

17. The method of claim 14, wherein sorting the initial set of plastic granules comprises sorting with an optical sorter.

18. The method of claim 14, wherein fusing the accept granules together to form the panel core comprises compression molding.

19. The method of claim 18, wherein fusing the accept granules together to form the panel core comprises positioning the accept granules between two skin layers, the panel core also fusing with the skin layers to form the panel.

20. The method of claim 14, further comprising distributing the accept granules, prior to fusing together to form the panel core, by dividing a layup assembly into substantially equal cells and metering out a substantially equal weight of the accept granules into each cell and compacting the accept granules prior to fusing together to form the panel core.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to describe the manner in which the above-recited and other advantages and features of the invention can be obtained, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. Understanding that these drawings depict only typical embodiments of the invention and are not therefore to be considered to be limiting of its scope, the invention will be described and explained with additional specificity and detail through the use of the accompanying drawings in which:

[0016] FIG. 1A is a front view of an exemplary architectural resin panel that incorporates waste particles into the structure of the panel;

[0017] FIG. 1B is a side view of the architectural resin panel of FIG. 1A;

[0018] FIG. 2 illustrates a method for manufacturing an architectural resin panel that incorporates waste plastic materials;

[0019] FIG. 3 illustrates an optical sorting process that may be utilized to sort an initial set of waste plastic granules into a set of accept granules and a set of reject granules;

[0020] FIG. 4A illustrates a plan view of a layup assembly, and illustrates a process of dividing the layup assembly into substantially equal cells and metering of a substantially equal amount of accept granules into each cell;

[0021] FIG. 4B illustrates a process of compacting the accept granules of the layup assembly prior to fusing the granules together;

[0022] FIG. 5A illustrates an exemplary compression molding process that may be utilized to form an architectural resin panel;

[0023] FIG. 5B illustrates an architectural resin panel formed via the compression molding process shown in FIG. 3A; and

[0024] FIG. 6 illustrates an architectural resin panel having a section of air pocket or empty void defects as a result of insufficient compacting prior to compression molding of the granules of the resin panel.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] The present disclosure relates to architectural resin panels that incorporate scrap materials. In particular, embodiments of the present invention incorporate granules from waste resin panel materials into the structure of new resin panels in order to form architectural resin panels having unique aesthetic features.

[0026] FIGS. 1A and 1B illustrate an exemplary architectural resin panel 100 that at least partially incorporates scrap materials in front and side view, respectively. The architectural resin panel 100 includes a plurality of plastic granules 120 fused together to form a panel core 110. One or more outer “skin” layers 130a and 130b may also be fused together with the panel core 110, as best shown in the side view of FIG. 1B. The skin layers 130a and 130b may be formed from a different material than the plastic granules 120, but preferably are formed from the same plastic material.

[0027] The plastic granules may include any plastic material that can be suitably used in a resin panel manufacturing process such as a compression molding process. Examples include polyethylene terephthalate (PET), polyethylene terephthalate with glycol-modification (PETG), acrylonitrile butadiene-styrene (ABS), polyvinyl chloride (PVC), polyvinyl butyral (PVB), ethylene vinyl acetate (EVA), polycarbonate (PC), styrene, polymethyl methacrylate (PMMA), polyolefin (e.g., UHMW or HDPE or LDPE or PP), thermoplastic polyurethane (TPU), a cellulose-based polymer, polylactic acid (PLA), or polyhydroxyalkanoate (PHA), or combinations thereof.

[0028] Preferably, however, the plastic granules 120 are primarily formed from the same material so that effective fusing/bonding of the granules 120 can occur during manufacture and formation of the panel 100. In particularly preferred embodiments, the plastic granules 120 are formed from PETG. Architectural resin panels formed from PETG provide effective structural properties and good aesthetic features.

[0029] The borders between the plastic granules 120 of the architectural resin panel 100 may be visible in the finished panel. This provides a more diffuse, textured, and aesthetically pleasing look to the panel 100 as compared to the case where the borders are invisible or significantly less visible. In panels where the granule borders are not visible, the contaminants 140 appear to be “floating” in clear plastic in an aesthetically unpleasing manner. Use of PETG for the plastic granules 120 is particularly associated with the formation of visible granule borders in finished panels.

[0030] The plastic granules 120 are preferably substantially transparent, as in the illustrated embodiment. However, as shown, some of the plastic granules 120 are “contaminant granules,” which are defined herein as granules at least partially comprising a “contaminant material” 140. Although contaminant materials are usually understood to be undesirable for incorporation into the architectural resin panel 100, intentionally including some controlled amount of contaminant material can result in architectural resin panels 100 that have beneficially aesthetic properties. This also advantageously allows for the reuse of waste plastic materials that would likely otherwise require extensive waste processing or sending to a landfill.

[0031] Contaminant materials 140 may include anything that is not formed of the same material as the plastic granules 120, anything that has a different color than the plastic granules 120, and/or anything that has a different opacity than the plastic granules 120. Often, however, the contaminant material is a fabric, a plastic film, or a plant material. The illustrated architectural resin panel 100, for example, includes several pieces of colored, opaque plastic film.

[0032] White plastic film, in particular, has been found to provide good aesthetic properties to the architectural resin panel 100, and preferred embodiments having plastic film contaminants include a majority of plastic film contaminants that are white, though one or more other colors may be included as well. For example, some embodiments may include a set of plastic film contaminants where most of the contaminants are white and some minority of contaminants are blue and/or another non-white color.

[0033] The proportion of contaminant granules mixed within the plastic granules 120 that make up the panel core 110 can be tuned to maximize the aesthetic properties of the panel 100. If too few or too many of the plastic granules 120 are contaminant granules, the panel 100 will be less aesthetically pleasing. For example, the contaminants may look like they were unintentional if there are too few of them, whereas when too many are included the panel tends to look excessively clustered and overly busy.

[0034] The panel 100 may therefore be configured such that about 1% to about 12% of the plastic granules 120 are contaminant granules, or about 2% to about 10% of the plastic granules 120 are contaminant granules, or more preferably about 3% to about 8% of the plastic granules 120 are contaminant granules, or most preferably about 4% to about 6% of the plastic granules 120 are contaminant granules, with the remaining plastic granules 120 being contaminant-free granules. This can translate (e.g., where one or more skin layers 130a, 130b are included) to a weight percentage where the contaminant granules make up about 1% to about 10% of the overall weight of the panel 100, or about 1.5% to about 7.5% of the overall weight of the panel 100, or about 2% to about 5% of the overall weight of the panel 100. Using the foregoing percentages of contaminant granules maximizes the aesthetic look of the resulting panels.

[0035] The panel 100 may also be configured to have optical properties that maximize the aesthetic properties of the panel 100. For example, the mixture of contaminant granules and non-contaminant granules may be tailored to produce a panel having a visible light optical transmission of about 50% to about 85%, or about 55% to about 80%, or more preferably about 60% to about 75%.

[0036] Panels with a proportion of contaminant granules above the foregoing percentages and/or with optical transmission percentages below the foregoing ranges tended to have an excessively clustered, busy, or “dirty” appearance. On the other hand, panels with a proportion of contaminant granules below the foregoing percentages and/or with optical transmission percentages above these ranges tended to have a boring, insufficiently detailed appearance or to appear as though the sparse contaminant granules were true defects rather than intentional aesthetic features.

[0037] FIG. 2 illustrates a method 200 of manufacturing an architectural resin panel such as described herein. In an optional step 210, waste plastic material is preprocessed and/or presorted. A manufacturer may presort the scrap material to remove metal, pieces that include metal, and/or unwanted types of plastic, for example. Preprocessing may include shredding of plastic material to reduce the size of plastic waste pieces to a more manageable size for the subsequent granulating step, for example.

[0038] The manufacturer then granulates waste plastic material to form an initial set of plastic granules (step 220). The manufacturer preferably grinds the waste plastic to a particular size range to enhance the effectiveness and/or efficiency of the subsequent sorting step (step 230). If the average granule size is too small, the contaminants become too small and difficult to efficiently sort from the remaining granules. On the other hand, if the average granule size is too large, too many granules will include some amount of contaminant material and will be sorted out, leaving few granules left for subsequent reuse in a new panel. To optimize sorting efficiency, the granulator may grind the waste plastic to an average granule size of about ⅛ inch to about ½ inch, or more preferably about 3/16 inch to about 7/16 inch, or most preferably about ¼ inch to about ⅜ inch.

[0039] Following granulating, the manufacturer may optionally clean the initial set of granules by removing all dust and lightweight particles, known as dedusting (step 230). The dedusting step 230 may also be referred to as elutriation or aspiration. The dedusting step may allow the automated sorting process to better distinguish between clear/transparent granules and those that are opaque and/or colored.

[0040] The manufacturer may then sort the initial set of plastic granules to form a set of reject granules and a set of accept granules (step 240). This may be accomplished using an optical sorter, as described in more detail below. Most, if not all, of the set of reject granules will be contaminant granules at least partially comprising a contaminant material. Most of the set of accept granules will be contaminant-free granules. However, as mentioned above, the sorting process is configured to intentionally allow a certain amount of contaminant granules within the set of accept granules to provide the resulting panel with a desirable, “flecked” aesthetic property. As explained further below, this sorting step may be repeated in order to achieve a certain amount of contaminant granules within the set of accept granules. With each sorting step the concentration of contaminant granules will decrease.

[0041] Following sorting, the manufacturer may fuse the accept granules together to form a panel core (step 270). Optionally, prior to fusing, the manufacturer may distribute the accept granules into multiple cells of a layup according to a substantially equal weight of accept granules in each cell (step 250) and/or may mechanically compact the accept granules (step 260), as explained in more detail below. The manufacturer preferably utilizes compression molding to perform the fusing step.

[0042] FIG. 3 schematically illustrates an exemplary sorting process 300 that may be utilized in step 240 of the method 200. The process feeds an input stream 310 of the initial set of plastic granules to an optical sorter 320 such as a free-fall optical sorter. The optical sorter 320 sorts the granules according to opacity, color, or some combination thereof. For example, the optical sorter 320 may be configured to allow transparent granules to pass to the set of accept granules 330 while any opaque and/or colored granules are sorted into the set of reject granules 340.

[0043] The process 300 may optionally reroute some or all of the set of accept particles 330 back through the optical sorter 320 in a reroute stream 350 to further sort the granules and further remove contaminant granules. Depending on particular optical sorter 310 settings, particular waste plastics utilized, and particular application needs, approximately two to three passes through the optical sorter 320 provides a set of accept granules 330 with a targeted proportion of contaminant granules to contaminant-free granules. Less than about two passes tends to provide a set of accept granules 330 that still retains too many contaminant granules, whereas more than about three passes tends to provide a set of accept granules 330 that is too “clean” and does not include a desired amount of contaminant granules.

[0044] FIG. 4A schematically illustrates a layup assembly 400 for manufacturing an architectural resin panel/sheet, and which may be utilized in conjunction with step 250 of method 200. As shown, the manufacturer may place a grid 410 or similar border structure (and/or laser grid or projection systems) that divides the layup assembly 400 into multiple cells, and may place a substantially equal amount (e.g., by weight) of accept granules 330. This arrangement beneficially distributes the accept granules 330 across the desired sheet size in a uniform manner and decreases the introduction of size defects into the process. The grid 410 may be removed prior to subsequent compression molding of the granules 330. The cell size may vary according to particular application needs, but may generally be within the range of about 0.5 to about 4 square feet, more commonly about 1 to 2 square feet.

[0045] FIG. 4B illustrates a process for using a compactor 420 to compact the granules 330 of the layup assembly 400, and which may be used in conjunction with step 260 of method 200. The compactor 420 may include a drive section 430 and a plate section 440. The drive section 430 is configured to apply a compaction force to the plate section 440, which distributes that force and applies it to the accept granules 330. Compaction aids in reducing air gaps between adjacent granules 330, which in turn provides better fusing of granules and better structural integrity of the resulting resin panel.

[0046] FIG. 6, for example, illustrates an architectural resin panel 600 that includes a section of air pocket or void defects 610 resulting from insufficient compacting prior to fusing of the granules of the resin panel. The air pocket defects 610 can mar the aesthetic features of the panel 600 and/or reduce the structural integrity of the panel 600.

[0047] Referring back to FIG. 4B, the drive section 430 is preferably configured to provide vibration, often in a random orbital pattern. The vibration may or may not be have adjustability by the operator. Most often a medium setting works better than a very low or very high setting. The manufacturer may also apply slight downward pressure to the compactor 420, such as about 0.5 to about 5 psi, or about 1 to about 2 psi. This type of compaction provides superior results to vibration treatments applied to the cell or table, which tend to simply cause larger granules to separate from the smaller granules without removing air pockets or increasing the density of the granules.

[0048] FIGS. 5A and 5B schematically illustrate a compression molding process that may be utilized in conjunction with step 270 to fuse the assembled accept granules 330 into a finished panel 100. As shown, the accept granules 330 intentionally include a targeted amount of contaminant material 140. The layup assembly 550 may include skin layers 130a and 130b positioned on upper and lower sides of the bed of accept granules 330 that will form the panel core 110. Heat and pressure are applied to the layup assembly 550 to melt and fuse the accept granules 330 to form the panel core 110, and to fuse the panel core 110 to the skin layers 130a and 130b. After fusing together the separate plastic components of the layup assembly 550, the process forms the architectural resin panel 100 as shown in FIG. 5B.

[0049] The compression molding process may utilize a pressure of about 60 psi to about 175 psi, and a temperature of about 225° F. to about 380° F. The compression molding process may comprise using a heated mechanical press, autoclave, or other thermosetting environment. Heated mechanical press for performing various acts of the methods described herein include but are not limited to hot steam, electric heat, hot oil heated, and other press types. In light of this disclosure, one will appreciate that the temperatures and pressures for laminating with a heated mechanical press, autoclave, or other thermosetting environment may depend on the material type of the plastic granules, desired sheet/panel size, and other particular application needs.

[0050] Architectural resin panels described herein may also include different color features. The color features may be provided by a colored film coating applied to the outer surface of the panel or attached to or integrated into a skin layer, for example. Color features may additionally or alternatively be provided by dyes or direct coloration of the plastic material that forms skin layers and/or the granules of the panel core.

[0051] The foregoing embodiments provide architectural resin panels, and methods of manufacturing the same, that can incorporate waste plastic materials in a way that can reduce waste processing burden and that can provide a structurally sound and aesthetically pleasing resin panel.

[0052] The present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. The described embodiments are to be considered in all respects only as illustrative and not restrictive. The scope of the invention is, therefore, indicated by the appended claims rather than by the foregoing description. All changes that come within the meaning and range of equivalency of the claims are to be embraced within their scope.