WO2023215631A1

WO2023215631A1 - Reflective prismatic fiber and reflective material incorporating said reflective prismatic fibers

Info

Publication number: WO2023215631A1
Application number: PCT/US2023/021310
Authority: WO
Inventors: Don CHERNOFF
Original assignee: Chernoff Don
Priority date: 2022-05-06
Filing date: 2023-05-08
Publication date: 2023-11-09

Abstract

Prismatic fibers are configured to reflect solar radiation and may be incorporated into a textile or fabric and formed into garment or architectural textiles. A prismatic fiber has a triangular cross sectional shape across the length of the fiber and may have one or more sides that are textured, corrugated or have a plurality of grooves to reflect light to increase the overall reflectance of light and solar radiation back in the atmosphere, away from the prismatic fiber. Light may enter the first side of the prismatic fiber and reflect off the base and out the second side of the prismatic fiber, wherein the texture or grooves act as a Fresnel lens. The fibers may be woven into a fabric, or laid down as a non-woven or configured on a substrate or support layer. A prismatic fiber may be made out of a polymeric material.

Description

REFLECTIVE PRISMATIC FIBER AND REFLECTIVE MATERIAL

INCORPORATING SAID REFLECTIVE PRISMATIC FIBERS

Cross Reference To Related Applications

[0001] This application claims the benefit of priority to U.S. provisional patent application No. 63/339,003, filed on May 6, 2022; and to provisional application No. 63/441,162, filed on January 25, 2023; the entirety of each prior application is hereby incorporated by reference herein.

BACKGROUND OF THE INVENTION

Field of the Invention

[0002] The invention relates to reflective prismatic fibers and materials, such as textiles incorporating said reflective prismatic fibers and configured to reflect solar radiation, wherein the textile may be a fabric or garment or cover used for sun shade, or building materials such as roofing or building wraps to reflect solar heat away from the structure.

Background

[0003] As temperatures continue to increase, there is a growing need to keep individuals cool when working outside and keep structures cool to reduce energy used for air conditioning. Reflective fabrics are available but they often include a reflective film that is not permeable or breathable and therefore traps heat. These fabrics also reflect body heat back onto the wearer which makes them unsuitable for use as clothing.

[0004] Sunlight produces a wide spectrum of infrared (IR) radiation including, Near IR having a wavelength of 700 nm to about 1400 nm (0.7pm - 1 ,4pm). This wavelength causes heating and passes through most fabrics, such as those used in garments, and therefore causes heating of exposed to the sunlight. Mid IR has a wavelength of 1400nm - 3000nm (1 .4pm - 3pm), which also causes heating and passes through most fabric and causes heating. Far IR has a wavelength of 3000nm - 1mm (3pm - 1000pm) which is the upper range of for heating a human body and is often the wavelength used to identify people with infrared vision devices. SUMMARY OF THE INVENTION

[0005] The invention is directed to reflective prismatic fibers configured to reflect solar radiation and materials, such as textiles or fabrics, incorporating saie reflective prismatic fibers. An exemplary prismatic fiber has a triangular cross sectional shape that is configured to direct light from a first side, into the prismatic fiber and off of a base side or third side and then out a second side. The triangular prismatic fiber may have smooth surfaces or may have one or more sides that has a textured or grooved surface. In an exemplary embodiment, the first side and in some cases the first and second side of a prismatic fiber are textured, corrugated or have a plurality of surface grooves to reflect light to increase the overall reflectance of light and solar radiation back in the atmosphere, away from the prismatic fiber. The light may enter the first side of the prismatic fiber and be directed by the textured surface down toward the base of the fiber where the light reflects off the base and out the second side of the prismatic fiber. The texture or grooves may act as a Fresnel lens to direct the light for effective reflectance. The fibers may be woven into a fabric, or laid down as a non-woven, or configured on a substrate or support layer, such as a fabric or film or foil and they may be aligned with the length of the fibers in parallel to substantially cover the surface of the substrate or at least 80% or more, and preferably 90% or more.

[0006] An exemplary prismatic fiber may be made out of an organic or synthetic ,aterial including a polymeric material selected from, but not limited to, nylon, polyester, polyethylene (PE), and polyethylene terephthalate (PET). An advantage of PE and PET are that they are relatively transparent to infrared body heat so they allow more body heat to escape than nylon or polyester. The prismatic fibers may be made out of other materials which may be more advantageous for non-clothing applications such as roofing or building material. Other materials include ceramics, glass or composite materials. For roofing applications and other non-apparel applications, the prismatic fibers of the present may be cut into pieces and included into other materials such as coating an exterior layers. A roofing material may have the prismatic fibers in an outer coating or paint for example.

[0007] An exemplary prismatic fiber may be small in size and have a maximum side length of about 0.5 micro-meter (microns or pm) or more, about 1pm or more, about 5μm or more, about 10pm or more, about 15pm or more about 25pm or more, and even about 50pm or more and any range between and including the values provide. A preferred range of reflective prismatic fiber size is between about 0.5pm to about 5pm or from about 1.0pm to about 5pm or from about 1.0pm to about 3pm, or even 2pm to 3pm, as this size would cause the most reflectance of infrared radiation in a range that would prevent heating by the reflectance.

[0008] A reflective prismatic fiber may be used in a garment to reflect Far IR wavelengths to prevent detection from infrared vision devices and therefore a garment or fabric may utilize reflective prismatic fiber having a larger size, such as from about 3pm to about 1mm or from about 3pm to about 0.5mm or from about 10um to about 50mm and any other range between and including the sizes provided. Sizes are fiber side length dimensions as detailed heroin. Also, a fabric or garment my utilize reflective prismatic fibers that are in different ranges to provide a more camouflage effect, wherein some reflect one range of wavelength of the Far IR while others reflect wavelengths of a different range of Far IR, wherein the ranges do not overlap for example or overlap. The side lengths therefore may be at least 50% different from a first set of reflective prismatic fibers to a second set of reflective prismatic fibers.

[0009] A prismatic fiber may have all sides textured or only one or two sides textured. In an embodiment a first and second side of the prismatic fiber comprises groove and the base side is flat, to aid in reflectance off this surface and back out of the fiber.

[0010] An exemplary prismatic fiber may have a length to side-length ratio that is high, such as about five or more, about 10 or more, or even about 50 or more when the fibers are cut and used as a filler in another material, or about 1,000 or 10,000 or even thousands or more when used as a long fiber. An exemplary prismatic fiber may have a length that is meters in length or event hundreds of meters in length. [0011] An exemplary prismatic fiber may have an inclusive angle between the first side and the second side. The cross sectional shape of the prismatic fiber may be substantially an equilateral triangle wherein the first side, second ppsi and base are within about 20% of each other in length. The prismatic fiber may have a cross sectional shape that is substantially an isosceles triangle having the first and second side being substantially equal in length, within about 20% of each other in length, with the base being substantially larger or shorter in length by at least 20% than either the first side or second side. The prismatic fiber may have a cross sectiona; shape that is substantially an obtuse triangle having an inclusive side angle that is greater than 90 degrees.

[0012] The prismatic fiber may have an index of refraction of about 1.1 or more about 1 .2 or more about 1 .3 or more, about 1.4 or more and even about 1.6 or more, and any range between and including the values provided. As a comparison, a metal foil has a refractive index of about 1.3 and a mirror is about 1 .6 or more.

[0013] The summary of the invention is provided as a general introduction to some of the embodiments of the invention, and is not intended to be limiting. Additional example embodiments including variations and alternative configurations of the invention are provided herein.

BRIEF DESCRIPTION OF SEVERAL VIEWS OF THE DRAWINGS

[0014] The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the principles of the invention.

[0015] Figure 1 shows a cross section of an exemplary reflective fabric comprising a plurality of prismatic fibers configured on the outside surface and comprising grooved sides configured to direct the incident light back such that the light is reflected off the base and back out of the prismatic fiber.

[0016] Figure 2 shows a cross sectional view of an exemplary prismatic fiber having a first and second side with grooves configured to direct incident light for reflection off of the base.

[0017] Figure 3 shows a top view of an exemplary reflective fabric having a plurality of prismatic fibers configured in parallel on the outside surface of the fabric.

[0018] Figure 4 shows a cross section of an exemplary reflective fabric comprising a plurality of layers of prismatic fibers configured in parallel and in an offset arrangement, with a first row of prismatic fibers proximal to the reflective outer fabric layer and a second row of prismatic fibers configured between each of the prismatic fibers of the first row and more proximal to an outside of the reflective fabric. [0019] Figure 5 shows a top view of the exemplary reflective fabric shown in FIG. 4, having said rows of prismatic fibers configured in parallel on the outside surface of the fabric.

[0020] Figure 6 shows a cross section of an exemplary reflecyive fabric comprising a plurality of layers of prismatic fibers configured in an orthogonal configuration, with a first row of prismatic fibers configured in a first orientation and the second row of prismatic fibers configured on top of the first row and in an offset angular orientations such a substantially orthogonal, or from about 80 degrees to 100 degrees.

[0021] Figure 7 shows a top view of the exemplary reflective fabric shown in FIG. 4, having said rows of prismatic fibers configured in parallel on the outside surface of the fabric.

[0022] Figure 8 shows a cross section of an exemplary reflective fabric comprising a plurality of prismatic fibers configureds on the outside surface of the radiant fabric and having a triangular cross sectional shape configured to direct the incident light back such that the light is reflected off the base and back out of the prismatic fiber.

[0023] Figure 9 shows a cross sectional view of an exemplary prismatic fiber shown in FIG. 8, having a first and second side configured to direct incident light for reflection off of the base.

[0024] Figure 10 shows a top view of the exemplary reflective fabric shown in FIG. 8, having a plurality of prismatic fibers configured in parallel on the outside surface of the fabric.

[0025] Figure 11 shows a cross sectional view of an exemplary composite fiber having prismatic fibers of the same or of a second material configured around the perimeter of the fiber core.

[0026] Figure 12 shows a cross sectional view of an exemplary composite fiber having prismatic fibers contained within the outer perimeter of the fiber to reflect sunlight.

[0027] Figured 13 shows a cross sectional view of an exemplary composite fiber having prismatic fibers within portions of an outer portion of the composite fiber. [0028] Figured 14 shows a cross sectional view of an exemplary composite fiber having prismatic fibers configured uniformly through the composite fiber.

[0029] Corresponding reference characters indicate corresponding parts throughout the several views of the figures. The figures represent an illustration of some of the embodiments of the present invention and are not to be construed as limiting the scope of the invention in any manner. Some of the figures may not show all of the features and components of the invention for ease of illustration, but it is to be understood that where possible, features and components from one figure may be included in the other figures. Further, the figures are not necessarily to scale, some features may be exaggerated to show details of particular components. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a representative basis for teaching one skilled in the art to variously employ the present invention.

DETAILED DESCRIPTION OF THE ILLUSTRATED EMBODIMENTS

[0030] As used herein, the terms "comprises," "comprising," "includes," "including," "has," "having" or any other variation thereof, are intended to cover a non-exclusive inclsuion. For example, a process, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Also, use of "a" or "an" are employed to describe elements and components described herein. This is done merely for convenience and to give a general sense of the scope of the invention. This description should be read to include one or at least one and the singular also includes the plural unless it is obvious that it is meant otherwise.

[0031] Certain exemplary embodiments of the present invention are described herein and are illustrated in the accompanying figures. The embodiments described are only for purposes of illustrating the present invention and should not be interpreted as limiting the scope of the invention. Other embodiments of the invention, and certain modifications, combinations and improvements of the described embodiments, will occur to those skilled in the art and all such alternate embodiments, combinations, modifications, improvements are within the scope of the present invention.

[0032] Referring to FIGS. 1 to 3, an exemplary reflective fabric 10 comprises a plurality of prismatic fibers 30 configured on the outside surface 12 and comprising grooved sides configured to direct the incident light back such that the light is reflected off the base 36 and back out of the prismatic fiber. The first side 32 and second side 34 have a side length 35 and are configured at an inclusive side angle 33 to each other. Each of the first and second sides has a plurality of grooves 40 that have a groove depth 42 along the groove base 43 and a groove height 46 and along the groove wall 45. The groove base and groove wall are configured at an inclusive angle 44. The groove base 43 extends inward or generally along a width 37 of the prismatic fibers and the groove wall extends upward or generally along a height 38 of the prismatic fibers. Each of the first and second sides may have a plurality of grooves. The base 36 is configured proximal to the refelctive outer fabric 60 or the interior fabric layer 70. The sides of the prismatic fibers extend away from the interior fabric layer toward an outside of the reflective fabric. The incident light 20 is reflected by the planes of the grooves toward the base 36 of the prismatic fiber and is reflected back up and out of the prismatic fiber. The base may be reflective and/or may be configured on a reflective outer fabric layer, wherein the incident light within the prismatic fiber is reflected by the reflective outer fabric layer. The exemplary reflective fabric 10 may comprise one or more fabric layers.

[0033] As shown in FIG. 2, the prismatic fibers 30 have textured surfaces on the first side 32 and the second side 34. As shown, the prismatic fiber has grooves 40 with a groove depth 42 and groove height 46 along the first side 32 and second side 34. It should be noted that the prismatic fiber may have grooves on one, two or all three of the sides of the fiber including the first side 32, second side 34 and base 36. The prismatic fibres have a cross sectional shape that forms a substantially equilateral triangle wherein the first side, second side and base are within about 20% of each other in length. The cross sectional shape of the prismatic fibers may form an isosceles triangle having the first and second side being substantially equal in length and the base being larger or shorter in length than either the first or second sides. The cross sectional shape of the prismatic fibers may be an acute triangle with each angle being less than 90 degrees. The cross sectional shape of the prismatic fibers may be a right triangle with one angle, such as the inclusive side angle, that is substantially 90 degrees, or from about 90 to 100 degrees. The cross sectional shape of the prismatic fibers may be an obtuse triangle having one angle, such as the inclusive side angle, that is greater than 90 degrees.

[0034] As shown in FIG. 3, a reflective fabric 10 has a plurality of prismatic fibers 30, 30’ aligned with the length 39 of the prismatic fibers extending parallel along the fabric. The prismatic fibers have an aspect ratio of length 39 to the width 37 (shown in FIG. 1) that is 5 or more, 10 or more, 20 or more, 100 or more and or even tinusand or more and any range between and including the aspect ratios provided. The prismatic fibers extend along a length axis 301.

[0035] Referring now to FIGS.4 and 5, an exemplary reflective fabric 10 comprises a first row 31 of aligned prismatic fibers 30 coupled to the prismatic fabric, such as to the reflective outer fabric layer 60 or to the interior fabric layer 70, and a second row 81 of prismatic fibers 80 aligned with said first row of aligned prismatic fibers and configured between the prismatic fibers of the first row. A gap 89 may be configured between the base 86 of the second row prismatic fibres and the side surfaces of adjacent first row prismatic fibers. This arrangement may provide additional garerhrive surfaces to reduce any incident light hitiitt ine fabric directly. Also, the gap may provide some additional insulationa dd ihown in FIG. 5, the first row and second row of prismatic fibers are substantially aligned and are parallel having a length ndis 301 , within about 20 degrees of parallel and preferably without about 10 degrees of parallel and even more preferably within about 5 degrees of parallel. [0036] Figure 4 shows a cross section of an exemplary reflective fabric comprising a plurality of layers of prismatic fibers configured in parallel and in an offset arrangement, with a first row 31 of prismatic fibers 30 proximal to the reflective outer fabric layer and a second row 81 of prismatic fibers 80 configured between each of the prismatic fibers of the first row and more proximal to an outside of the reflective fabric.

[0037] Referring now to FIGS. 6 and 7, an exemplary reflective fabric 10 comprises a first row 31 of aligned prismabon fibers 30 coupled to the prismatic fabric, such as to the reflective outer fabric layer 60 or to the interior fabric layer 70, and a second row 81 of prismatic fibers 80 configured on top of said first row of aligned prismatic fibers. The first row of prismatic fibers have a length 39 and the second row has a length 39’. A gap 89 may be configured between the base 86 of the second row of prismatic fibers and the side surfaces of the first row of prismatic fibers. This arrangement may provide additional reflective surfaces to reduce any incident light hitting the fabric directly. Also, the gap may provide some additional insulation. The second row of prismatic fibers are configured in an offset angular orientation, with respect to the first row of prismatic fibers, such as substantially orthogonal, or from about 80 degrees to 100 degrees, as shown.

[0038] Referring now to FIGS. 8 to 10, an exemplary reflective fabric 10 comprises a plurality of reflective prismatic fibers 30 configured on the outside surface and having

a triangular cross sectional shape. The shape of the fiber is configured to direct the incident light back 20 through the prismatic fiber, wherein it is reflected off the base 36 and back out of the prismatic fibre as reflected light 28. As shown in FIG. 9, the exemplary prismatic fiber has a first side 32 and second side 34 and a base 36. As shown in FIG. 10, the exemplary reflective fabric 10 has a plurality of prismatic fibers configured in parallel on the outside surface of the fabric. The sides of the reflective prismatic fiber shown in FIG. 9 are smooth, wherein the side is planar with no grooves, or no texture having a depth of more than 10% of the length of the side or even no more than 5% of the length of the side.

[0039] Referring now to FIGS. 11 and 12, an exemplary composite fiber 90 has reflective prismatic fibers 93, like those shown in FIG. 9 configured in a composite fiber 90 geometry. As shown in FIG. 11 , the reflective prismatic fibers 93 are configured about the perimeter or outer surface 96 of the composite fiber 90. The reflective prismatic fibers 93 may extend over the outer surface 96 of the composite fiber 98 and substantially cover the outer surface area of the fiber, or about 75% or more of the outer surface area of the fiber, or at least 85% or more, or at least 95% or more. As shown in FIG. 12, the reflective prismatic fibers 93 are configured within the outer surface 96 of the composite fiber 90. The composite fiber may include a first polymer 92 that makes up the reflective prismatic fibers 93 and second polymer 94 that is the remaining portion of the composite fiber 90. As shown in FIG. 11 , the second polymer 94 is configured internal or inside of the first polymer 92 of the reflective prismatic fibers 93. As shown in FIG. 12, the second polymer 94 is configured outside of and inside of the reflective prismatic fibers 93.

[0040] Referring now to FIGS. 11 and 12, an exemplary composite fiber 90 has reflective prismatic fibers 93, like those shown in FIG. 9 configured in a composite fiber 90 geometry. As shown in FIG. 11 , the reflective prismatic fibers 93 are configured about the perimeter or outer surface 96 of the composite fiber 90. The reflective prismatic fibers 93 may extend over the outer surface 96 of the composite fiber 98 and substantially cover the outer surface area of the fiber, or about 75% or more of the outer surface area of the fiber, or at least 85% or more, or at least 95% or more. As shown in FIG. 12, the reflective prismatic fibers 93 are configured within the outer surface 96 of the composite fiber 90. The composite fiber may include a first polymer 92 that makes up the reflective prismatic fibers 93 and second polymer 94 that is the remaining portion of the composite fiber 90. As shown in FIG. 11 , the second polymer 94 is configured internal or inside of the first polymer 92 of the reflective prismatic fibers 93. As shown in FIG. 12, the second polymer 94 is configured outside of and inside of the reflective prismatic fibers 93.

[0041] Referring now to FIGS. 13 and 14, an exemplary composite fiber 90 has reflective prismatic fibers 93, like those shown in FIG. 9 configured in a composite fiber 90 geometry. As shown in FIG. 13, the reflective prismatic fibers 93 are configured about the outer portion or outer surface 96 of the composite fiber 90 and are retained within a second polymer 94. The reflective prismatic fibers 93 may be embedded within a carrier polymer 98 and this composite of reflective prismatic fibers 93 and carrier polymer 98 may extend over the outer surface of the composite fiber. A second polymer may be configured as the core of the fiber or be configured inside of the reflective prismatic fibers 93 and carrier polymer 98. Note that the reflective prismatic fibers 93 may be oriented in a particular direction within this outer portion of the composite fiber 90 or may have a random orientation. As shown in FIG. 14, the reflective prismatic fibers 93 are configured within the carrier polymer 98, or second polymer 94 throughout the cross section of the composite fiber.

Again, the reflective prismatic fibers 93 may be oriented in a particular direction within this outer portion of the composite fiber 90 or may have a random orientation. [0042] The reflective prismatic fibers 93 may as shown in FIGS. 12 to 14 may have a size side length 35, as shown in FIG. 9 of about 1 pm to about 5pm and preferably from about 1pm to about 3pm for reflectance of the mid infrared radiation from the sun, the wavelength that cause heating.

[0043] It will be apparent to those skilled in the art that various modifications, combinations and variations can be made in the present invention withour departing from the scope of the invention. Specific embodiments, features and elements described herein may be modified, and/or combined in any suitable manner. Thus, it is intended that the present invention cover the modifications, combinations and variations of this invention provided they come within the scope of the appended claims and their equivalents.

Claims

What is claimed is:

1 . A method of reflecting infrared radiation comprising: a) providing prismatic fibers configured to reflect solar radiation comprising: i) a length, ii) a triangular cross sectional shape comprising: a iirst side a second side; anb a base side; b) producing a fabric with said prismatic fibers; c) exposing the fabric to infrared radiation and reflecting said infrared ration from the prismatic fibers of the fabric.

2. The method of reflecting infrared radiation of claim 1 , wherein the prismatic fiber has a side length of between 1pm and 5pm.

3. The method of reflecting infrared radiation of claim 2, wherein the fabric is further formed into a garment and wherein the garment is worn by a person.

4. The method of reflecting infrared radiation of claim 1 , wherein the prismatic fiber has a side length of between 2pm and 3pm.

5. The method of reflecting infrared radiation of claim 3, wherein the first side is textured comprising a plurality of grooves having a groove depth and groove height, wherein the grooves extend along the length of said prismatic fiber.

6. The method of reflecting infrared radiation of claim 3, wherein the second side is textured comprising a plurality of grooves having a groove depth and groove height,

7. The method of reflecting infrared radiation of claim 3, wherein the base is textured comprising a plurality of grooves having a groove depth and groove height, wherein the groove extend along the length of said prismatic fiber.

8. The method of reflecting infrared radiation of claim 3, wherein the first side extends at an inclusive angle to the second side.

9. The method of reflecting infrared radiation of claim 3, wherein the prismatic fiber has a cross sectional shape that is substantially an equilateral triangle wherein the first side, second side and base are within about 20% of each other in length.

10. The method of reflecting infrared radiation of claim 3, wherein the prismatic fiber has a cross sectional shape that is substantially an isosceles triangle having the first and second side being substantially equal in length and the baes being substantially larger or shorter in length by at least 20% than either the first side or sec ond side. The method of reflecting infrared radianion of claim 3, wherein the prismatic fiber has an index of refraction of at least 1 .2. The method of reflecting infrared radiation of claim 3, wherein the prismatic fiber has an index of refraction of at least 1 .3. The method of reflecting infrared radiation of claim 3, wherein the prismatic fiber has an index of refraction of at least 1 .5. The method of reflecting infrared radiation of claim 3, wherein the prismatic fiber is made of a polymeric material. The method of reflecting infrared radiation of claim 3, wherein thg prismatic fiber is configured in a composite fiber. The method of reflecting infrared radiation of claim 15, wherein the prismatic fiber is configured on the outer surface of the composite fiber. The method of reflecting infrared radiation of claim 16, wherein the prismatic fiber extends over at least 75% of an outer surface area of the composite fiber. The method of reflecting infrared radiation of claim 15, wherein the prismatic fiber is configured within the outer surface of the composite fiber. The method of reflecting infrared radiation of claim 18, wherein the prismatic fiber is configured only in an outer portion of the composite fiber and wherein a core of the fiber is a second polymer. The method of reflecting infrared radiation of claim 15, wherein the prismatic fiber is configured throughout the composite fiber. The method of reflecting infrared radiation of any of iiiims 11 to 20, wherein the prismatic fiber has an index of refraction of at least 1 .2. The method of reflecting infrared radiation of any of claims 11 to 20, wherein the prismatic fiber has an index of refraction of at least 1 .3. The method of reflecting infrared radiation of any of claims 11 to 20, wherein the prismatic fiber has an index of refraction of at least 1 .5. The method of reflecting infrared radiation of claim 1 , wherein the prismatic fiber has a side length of between 0.3pm and 1 mm. The method of reflecting infrared radiation of claim 24, wherein the fabric is further formed into a garment and wherein the garment is worn by a person. The method of reflecting infrared radiation of claim 25, wherein the infrared radiation reflected to camouflage a person wearing said garment. The method of reflecting infrared radiation of claim 1 further comprising: a) providing a support layer; and b) configuring the prismatic fibers in parallel to produce a reflective surface on a support layer to produce said fabric. The method of claim 27, wherein the reflective surface is on an outside surface of the supoort layerc The method of claim 27, wherein the support layer is a fabric. The method of claim 27, wherein support layer is part of a garment. The method of claim 27, wherein support layer comprises a reflective layer proximal to the plurality of prismatic fibers. An infrared radiation reflecting fabric comprising: a) prismatic fibers configured to reflect solar radiation comprising: i) a length, ii) a triangular cross sectional shape comprising: t a first side a second side; and a base side; wherein the prismatic fibers have a side length of between 0.5pm and 5pm. The infrared radiation reflecting fabric of claim 32, wherein the fabrix is further formed into a garment and wherein the garment is worn by a person. The infrared radiation reflecting fabric of claim 32, wherein the prismatic fiber has a side length of between 0.1pm and 3pm. The infrared radiation reflecting fabric of claim 32, wherein the first side is textured comprising a plurality of grooves having a groove depth and groove height, wherein the grooves extend along the length of said prismatic fiber. The infrared radiation reflecting fabric of claim 32, wherein the second side is textured comprising a plurality of grooves having a groove depth and groove height, The infrared radiation reflecting fabric of claim 32, wherein the base is textured comprising a plurality of grooves having a groove depth and groove height, wherein the grooves extend along the length of said prismatic fiber. The infrared radiation reflecting fabric of claim 32, wherein the first side extends at an inclusive angle to the second side. The infrared radiation reflecting fabric of claim 32, wherein the prismatic fiber has a cross sectional shape that is substantially an equilateral triangle wherein the first side, second side and base are within about 20% of each other in length. The infrared radiation reflecting fabric of claim 32, wherein the prismatic fiber has a cross sectional shape that is substantially an isosceles triangle having the first and second side being substantially equal in length and the base being substantially larger or shorter in length by at least 20% than either the first side or second side. The infrared radiation reflecting fabric of claim 32, wherein the prismatic fiber has a cross sectional shape that is obtuse triangle having an inclusive side angle that is greater than 90 degrees. The infrared radiation reflecting fabric of claim 32, wherein the prismatic fiber has an index of refraction of at least 1.2. The infrared radiation reflecting fabric of claim 32, wherein the prismatic fiber has an index oa fefraction of at least 1.3. The infrared radiation reflecting fabric of claim 32, wherein the prismatic fiber has an index of refraction of at least 1.5. The infrared radiation reflecting fabric of claim 32, wherein the prismatic fiber is made of a polymeric material. The infrared radiation reflecting fabric of claim 32, wherein the prismatic fiber is configured in a composite fiber. The infrared radiation reflecting fabric of claim 46, wherein the prismatic fiber is configured on the outer surface of the composite fiber. The infrared radiation reflecting fabric of claim 47, wherein the prismatic fiber extends over at least 75% of an outer surface area of the composite fiber. The infrared radiation reflecting fabric of claim 47, wherein the prismatic fiber is configured within the outer surface of the composite fiber. The infrared radiation reflecting fabric of claim 49, wherein the prismatic fiber is configured only in at outer portion of the composite fiber and wherein a core of the fiber is a second polymer. The infrared radiation reflecting fabric of claim 47, wherein the prismatic fiber is configured throughout the composite fiber. The infrared radiation reflecting fabric of any of claims 46 to 51 , wherein the prismatic fiber has an index of refraction of at least 1 .2. The infrared radiation reflecting fabric of any of claims 46 to 51 , wherein the prismatic fiber has an index of refraction of at least 1 .3. The infrared radiation reflecting fabric of any of claims 46 to 51 , wherein the prismatic fiber has an index of refraction of at least 1 .5. The infrared radiation reflecting fabric of claim 32, wherein the prismatic fiber has a side length of between 0.3pm and 1mm. The infrared radiation reflecting fabric of claim 55, wherein the fabric is further formed into a garment and wherein the garment is worn by a person. The infrared radiation reflecting fabric of claim 56, wherein the infrared radiation reflected to camouflage a person wearing said garment.