Spectral selective transparent sunshade curtain system

Abstract

The invention discloses a spectrum selective transparent sunshade curtain system which comprises a window frame composed of an upper transverse frame strip, a lower transverse frame strip, a left longitudinal frame strip and a right longitudinal frame strip, inner glass and outer glass are installed on the window frame, a roller shutter cavity is formed between the inner glass and the outer glass, and a spectrum selective transparent sunshade curtain is installed in the roller shutter cavity. Tensioning steel wires are compounded on the two sides of the spectrum selective transparent sunshade curtain respectively, a bottom rail is arranged at the lower end of the spectrum selective transparent sunshade curtain, bottom rail seals are arranged at the two ends of the bottom rail, the bottom rail seals are connected with sliding blocks, and the ends of the tensioning steel wires are connected with the sliding blocks. According to the invention, visible light can be transmitted, the indoor lighting requirement can be met, most of ultraviolet rays and infrared rays in sunlight can be effectively reflected, a flat state is kept in the use process, regulation and control can be carried out according to climate changes and requirements of indoor personnel, the indoor temperature is effectively prevented from being too high or too low, and the comfort of the indoor personnel is improved; and the building energy consumption and carbon emission are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of sunshade windows, in particular to a spectrally selective transparent sunshade curtain system. Background Art

[0002] The wavelength of ultraviolet rays in sunlight ranges from 280nm to 400nm. Long-term exposure may cause sunburn, eye problems, immune system suppression, and increase the risk of skin cancer. The wavelength of infrared rays ranges from 760nm to 1mm. It is the source of heat generated in sunlight, causing the temperature to rise. Today's buildings use large areas of glass curtain walls while pursuing indoor lighting, which leads to a large amount of direct sunlight entering the room. The infrared rays in sunlight increase the indoor temperature, affecting the thermal comfort of indoor personnel in the hot summer. The ultraviolet rays in sunlight will also accelerate the aging and fading of indoor facilities, reducing their service life. At the same time, in order to balance the temperature rise caused by sunlight entering the room, people need to cool down in the summer through air conditioning and other forms, which increases the cooling energy consumption of the building.

[0003] Sunshade film is an effective way to solve the problem of indoor temperature rise and ultraviolet burns caused by direct sunlight. At present, most buildings usually cover the glass windows of the building with sunshade film to prevent ultraviolet damage to the human body and indoor overheating. However, it also reduces the amount of solar radiation entering the room during the heating season and increases heating energy consumption.

[0004] Most of the existing sunshade films are used to insulate the exterior windows of buildings in the form of films, coatings, curtains, etc. Although the purpose of heat insulation is achieved, the entry of visible light is blocked at the same time, and it is impossible to achieve both lighting and sunshade at the same time. Summary of the invention

[0005] The object of the present invention is to provide a spectrally selective transparent sunshade system, which has high visible light transmittance, ultraviolet light blocking rate and infrared light blocking rate, and can keep the rolled film stretched in a flat state during use.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] A spectrally selective transparent sunshade system comprises a window frame consisting of an upper horizontal frame bar, a lower horizontal frame bar, a left vertical frame bar, and a right vertical frame bar, wherein inner glass and outer glass are installed on the window frame, a rolling curtain cavity is formed between the inner glass and the outer glass, a spectrally selective transparent sunshade is installed in the rolling curtain cavity, tensioning steel wires are respectively compounded on both sides of the spectrally selective transparent sunshade, a driving mechanism adapted to the spectrally selective transparent sunshade is provided in the upper horizontal frame bar, a bottom rail adapted to the lower horizontal frame bar is provided at the lower end of the spectrally selective transparent sunshade, bottom rail seals are provided at both ends of the bottom rail, a slider is connected to the bottom rail seal, the end of the tensioning steel wire passes through the spectrally selective transparent sunshade and is connected to the slider, and guide rail parts adapted to the slider are respectively provided in the left vertical frame bar and the right vertical frame bar.

[0008] Furthermore, the driving mechanism includes a winding tube for rolling up the spectrally selective transparent sunshade, a tubular motor is installed in the winding tube, and the two ends of the tubular motor are respectively provided with a motor driving wheel and a motor crown wheel, a tail plug is provided at the left end of the winding tube, and a guide device for guiding the cable to pass out is provided at the outer end of the tail plug, and corner connectors are respectively inserted at the upper and lower ends of the left longitudinal frame bar and the right longitudinal frame bar, and the corner connector is adapted to the upper and lower transverse frame bars, and a cable clearance hole is provided on the corner connector located at the upper end of the left longitudinal frame bar, and the cable passes through the cable clearance hole and is connected to an external control box.

[0009] Furthermore, the guide rail member includes a guide rail installed inside the left longitudinal frame bar and the right longitudinal frame bar, a limiting guide groove is provided on the inner side of the guide rail, a clamping plate adapted to the limiting guide groove is provided at the rear end of the slider, a roller adapted to the limiting guide groove is provided between the two clamping plates on the slider, a connecting baffle is provided at the upper end of the slider, the bottom rail seal is fixedly connected to the front end of the connecting baffle, and the upper end of the slider is located behind the connecting baffle and is provided with a fixing hole for fixing the tensioning wire.

[0010] Furthermore, a wire adjuster is provided at the rear end of the connecting baffle, and the wire adjuster includes a cylindrical block fixedly connected to the connecting baffle, a wire winding groove is provided in the middle portion of the outer wall of the cylindrical block, a wire guide groove is opened at the upper end of the cylindrical block, the lower end of the wire guide groove extends to the lower side wall of the wire winding groove, and the wire guide groove is located on the extension line of the fixing hole.

[0011] Furthermore, the spectrally selective transparent sunshade includes a first scratch-resistant layer, an outer protective layer, a spectrally selective reflective insulation layer, a substrate layer, and a second scratch-resistant layer which are arranged in sequence; the spectrally selective reflective insulation layer includes a metal layer, a metal oxide layer, an acrylic polymer layer, and a silicone adhesive layer which are arranged in sequence from the substrate layer to the outside.

[0012] Furthermore, the substrate layer is a flexible transparent PET layer, the outer protective layer is a transparent PVC protective layer, the first scratch-resistant layer and the second scratch-resistant layer are both modified polyurethane layers, and the hardness of the modified polyurethane layer is ≥4H.

[0013] Furthermore, the thickness of the substrate layer is 4-12 mil, the thickness of the spectrally selective reflection insulation layer is 1 mil, the thickness of the outer protective layer is 3 mil, and the thickness of the first scratch-resistant layer and the second scratch-resistant layer are both 0.25 mil.

[0014] The present invention has the following advantages:

[0015] 1. The present invention lowers or retracts the spectrally selective transparent sunshade in the rolling curtain cavity according to climate change and the needs of indoor occupants, effectively controlling the indoor temperature and keeping the room comfortable;

[0016] 2. The spectrally selective transparent sunshade in the rolling shutter cavity can block the heat of the sun and reduce the heat input into the room, thereby reducing the demand for air conditioning, saving energy costs, and reducing building carbon emissions. At the same time, it can effectively block the penetration of ultraviolet rays, reduce the risk of people being exposed to ultraviolet rays for a long time, help prevent skin problems such as sunburn, skin aging and skin cancer, and protect indoor furniture and floors, extending their service life;

[0017] 3. The sunshade window of the present invention can allow visible light to enter the room, maintain a good indoor field of vision and light to a certain extent, make the room bright and comfortable, reduce the lighting energy consumption of the building, and is not easily affected by folding and bending to cause obvious creases on the surface of the film material, thus ensuring the flatness of the sunshade film;

[0018] 4. The spectrally selective transparent sunshade curtain is composited with a tensioning steel wire, which can stretch the sunshade film to keep it flat during use, thus preventing the middle part of the sunshade film from deforming and coming into contact with the glass surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention;

[0020] Figure 2 It is a schematic diagram of the explosion structure of the present invention;

[0021] Figure 3 A detailed structural diagram of the connection between the tensioning wire and the slider of the present invention;

[0022] Figure 4 It is a detailed structural diagram of the slider and bottom rail sealing structure of the present invention;

[0023] Figure 5 It is a schematic structural diagram of the spectrally selective transparent sunshade curtain of the present invention.

[0024] In the figure: 1, upper horizontal frame bar; 2, lower horizontal frame bar; 3, left vertical frame bar; 4, right vertical frame bar; 341, guide rail; 342, limit guide groove; 5, inner glass; 6, outer glass; 7, spectrally selective transparent sunshade; 71, tensioning wire; 731, first scratch-resistant layer; 732, outer protective layer; 733, spectrally selective reflective insulation layer; 734, substrate layer; 735, second scratch-resistant layer; 8, corner connector; 81, cable clearance hole; 9, sealing strip embedding cavity; 1 0. Tube reel; 101. Tail plug; 11. Tubular motor; 111. Guide device; 112. Motor drive wheel; 113. Motor crown wheel; 12. Control box; 121. Upward touch arrow; 122. Downward touch arrow; 13. Bottom rail; 131. Bottom rail seal; 14. Slider; 141. Limit guide plate; 142-Roller; 143-Connecting baffle; 144. Fixing hole, 145. Cylindrical block; 146. Wire winding groove; 147. Wire guide groove. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0028] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0029] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use, or the positions or positional relationships commonly understood by those skilled in the art, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0030] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] refer to Figure 1-5 As shown, one embodiment of the present invention is:

[0032] A spectrally selective transparent sunshade system comprises a window frame consisting of an upper transverse frame bar 1, a lower transverse frame bar 2, a left longitudinal frame bar 3, and a right longitudinal frame bar 4, wherein an inner glass 5 and an outer glass 6 are installed on the window frame, a rolling curtain cavity is formed between the inner glass 5 and the outer glass 6, a spectrally selective transparent sunshade 7 is installed in the rolling curtain cavity, both sides of the spectrally selective transparent sunshade 7 are respectively compounded with tensioning wires 71, the upper transverse frame bar 1 is provided with a driving mechanism adapted to the spectrally selective transparent sunshade 7, the lower end of the spectrally selective transparent sunshade 7 is provided with a bottom rail 13 adapted to the lower transverse frame bar, both ends of the bottom rail 13 are provided with bottom rail seals 131, the bottom rail seals 131 are connected to a slider 14, the ends of the tensioning wire 71 pass through the spectrally selective transparent sunshade 7 and are connected to the slider 14, and the left longitudinal frame bar 3 and the right longitudinal frame bar 4 are respectively provided with guide rail members adapted to the slider 14.

[0033] Specifically, the surrounding edge portions of the inner glass 5 facing the outer glass 6 are in contact with the front side surfaces of the upper horizontal frame bar 1, the lower horizontal frame bar 2, the left vertical frame bar 3 and the right vertical frame bar 4 at the same time; the surrounding edge portions of the outer glass 6 facing the inner glass 5 are in contact with the rear side surfaces of the upper horizontal frame bar 1, the lower horizontal frame bar 2, the left vertical frame bar 3 and the right vertical frame bar 4 at the same time; the surrounding edge portions of the opposite sides of the inner glass 5 and the outer glass 6 form a sealing strip embedding cavity 9, in which a sealing strip is embedded for bonding and fixing the surrounding edge portions of the opposite sides of the inner glass 5 and the outer glass 6 together with the aforementioned upper horizontal frame bar 1, the lower horizontal frame bar 2, the left vertical frame bar 3 and the right vertical frame bar 4.

[0034] The driving mechanism includes a winding tube 10 for rolling up the spectrally selective transparent sunshade 7, a tubular motor 11 is installed in the winding tube 10, and a motor driving wheel 112 and a motor crown wheel 113 are respectively provided at both ends of the tubular motor 11, a tail plug 101 is provided at the left end of the winding tube 10, and a guide device 111 for guiding the cable to pass out is provided at the outer end of the tail plug 101, and corner connectors 8 are respectively inserted at the upper and lower ends of the left longitudinal frame bar 3 and the right longitudinal frame bar 4, and the corner connector 8 is adapted to the upper and lower transverse frame bars 1 and 2. A cable clearance hole 81 is provided on the corner connector 8 located at the upper end of the left longitudinal frame bar 3, and the cable passes through the cable clearance hole 81 and is connected to an external control box 12, and an upward touch arrow 121 and a downward touch arrow 122 are provided on the panel of the control box 12.

[0035] By means of the controller 12, the spectrally selective transparent sunshade in the roller shutter cavity can be lowered or rolled up according to climate changes and the needs of indoor occupants, thereby effectively controlling the indoor temperature and keeping the room comfortable.

[0036] The window frame and the inner and outer glass are sealed by the corner connector 8 and the sealing strip, so the assembly is convenient and quick.

[0037] In this embodiment, the guide rail member includes a guide rail 341 installed inside the left longitudinal frame bar 3 and the right longitudinal frame bar 4, and the guide rail 341 is provided with a screw hole for fixed installation, and the inner side wall of the guide rail 341 is provided with a limiting guide groove 342, and the rear end of the slider 14 is provided with a clamping plate 141 adapted to the limiting guide groove 342, and the slider 14 is provided with a roller 142 adapted to the limiting guide groove 342 between the two clamping plates 141, and the upper end of the slider 14 is provided with a connecting baffle 143, and the bottom rail seal 131 is fixedly connected to the front end of the connecting baffle 143, and the upper end of the slider 14 is located behind the connecting baffle 143 and is provided with a fixing hole 144 for fixing the tensioning wire 71.

[0038] The slider 14 is stably mounted on the guide rail by using the spaced-apart clamping plates 141, the rollers 142 ensure that the slider 14 can slide up and down along the guide rail 341, and the bottom rail seal 131 supports and tensions the lower end of the spectrally selective transparent sunshade 7, and can also support the slider 14 outward to stabilize its position, and can still ensure that the left and right sides of the spectrally selective transparent sunshade 7 remain in a tensioned state under unfavorable conditions such as loose tensioning wires. This prevents the spectrally selective transparent sunshade 7 from contacting the inner and outer glass during long-term use, and avoids failure due to wear.

[0039] The connecting baffle 143 is convenient for installing the bottom rail seal and can shield the tensioning wire. Furthermore, in order to facilitate the installation of the tensioning wire 71, the length of the wire often leaves an operating margin, which makes it difficult to achieve an ideal tensioning state after installation and difficult to meet the use requirements. Therefore, in this embodiment, a wire adjuster is provided at the rear end of the connecting baffle 143, and the wire adjuster includes a cylindrical block 145 fixedly connected to the connecting baffle 143, a wire winding groove 146 is provided in the middle of the outer wall of the cylindrical block 145, and a wire guide groove 147 is opened at the upper end of the cylindrical block 145, and the lower end of the wire guide groove 147 extends to the lower side wall of the wire winding groove 146, and the wire guide groove 147 is located on the extension line of the fixing hole 144.

[0040] After setting up the wire adjuster, the excess tensioning wire can be adjusted according to the excess length after installation, so that the excess part of the device is wound around the wire winding groove 146, thereby ensuring that the tensioning wire 71 tightens both sides of the spectrally selective transparent sunshade 7, thereby reducing the operating accuracy during installation and improving installation efficiency.

[0041] Since the excess amount of tensioning wire is uncontrollable, in this embodiment, the lower end of the wire guide groove 147 is extended to the lower side wall of the wire winding groove 146, so that there are various winding methods such as half a circle, full circle, and multiple circles when storing the excess tensioning wire, and the storage range of the excess tensioning wire is larger; the wire guide groove 147 is set on the extension line of the fixing hole 144, which ensures that the inlet and outlet segments of the tensioning wire 71 in the wire adjuster are both located in the wire guide groove 147, ensuring that the entry and exit are centered to avoid the deviation of the tensioning wire 71.

[0042] Furthermore, the spectrally selective transparent sunshade 7 includes a first scratch-resistant layer 731, an outer protective layer 732, a spectrally selective reflective heat-insulating layer 733, a substrate layer 734, and a second scratch-resistant layer 735 which are arranged in sequence, and the spectrally selective reflective heat-insulating layer 733 includes a metal layer, a metal oxide layer, an acrylic polymer layer, and a silicone adhesive layer which are arranged in sequence from the substrate layer to the outside.

[0043] The metal layer can be made of copper, titanium, silver and other metals. These metals are attached to the film layer by evaporation or sputtering to form a multi-layer structure. The metal film has a strong reflective ability to infrared radiation in the solar spectrum, which can reflect infrared rays and effectively reduce the entry of infrared rays. Metal oxide films such as nano-aluminum oxide are plated on the surface of the film, which mainly absorb ultraviolet rays, effectively reduce the penetration of ultraviolet rays, and protect the human body and indoor objects. Acrylic polymer (PA) is a material with strong anti-ultraviolet stability, which can effectively absorb ultraviolet rays and prevent the thermal insulation film from aging and discoloring. Multi-layer composite films are used to form a spectrally selective reflective thermal insulation layer with excellent ultraviolet and near-infrared blocking properties and good reflective thermal insulation and energy-saving effects, so that the spectrally selective transparent sunshade can not only transmit visible light to ensure indoor lighting requirements, but also effectively reflect most of the ultraviolet and infrared rays in sunlight, effectively avoid excessively high or low indoor temperatures, improve the comfort of indoor personnel, reduce the lighting energy consumption and carbon emissions of buildings, and can also be regulated according to climate change and the needs of indoor personnel.

[0044] The substrate layer is a flexible transparent PET layer, the outer protective layer is a transparent PVC protective layer, the first scratch-resistant layer and the second scratch-resistant layer are both modified polyurethane layers, and the hardness of the modified polyurethane layer is ≥4H.

[0045] The outermost layer is made of modified polyurethane, which has excellent transparency and smoothness, and is resistant to aging, durability, and wear, and can effectively protect the inner film layer; the outer protective layer 732 is made of PVC material film, which has good flame retardancy and mechanical properties; the base layer 734 is made of flexible transparent PET protective film, which has excellent transparency and smoothness, and is corrosion-resistant, enhancing the practicality of the base layer 734

[0046] Furthermore, the thickness of the substrate layer is 4-12 mil, the thickness of the spectrally selective reflection insulation layer is 1 mil, the thickness of the outer protective layer is 3 mil, and the thickness of the first scratch-resistant layer and the second scratch-resistant layer are both 0.25 mil.

[0047] Spectrally selective transparent sunshades are not easily affected by folding and bending, which may cause obvious creases on the surface of the film material. The tensioning wires set on both sides ensure the flatness of the sunshade and avoid deformation in the middle and wear and tear on the glass surface.

[0048] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A spectrally selective transparent sunshade system, characterized in that: The invention comprises a window frame consisting of an upper horizontal frame bar, a lower horizontal frame bar, a left vertical frame bar and a right vertical frame bar, inner glass and outer glass are installed on the window frame, a rolling curtain cavity is formed between the inner glass and the outer glass, a spectrally selective transparent sunshade is installed in the rolling curtain cavity, both sides of the spectrally selective transparent sunshade are respectively compounded with tensioning steel wires, a driving mechanism adapted to the spectrally selective transparent sunshade is provided in the upper horizontal frame bar, a bottom rail adapted to the lower horizontal frame bar is provided at the lower end of the spectrally selective transparent sunshade, bottom rail seals are provided at both ends of the bottom rail, a slider is connected to the bottom rail seal, the end of the tensioning steel wire passes through the spectrally selective transparent sunshade and is connected to the slider, and guide rail parts adapted to the slider are respectively provided in the left vertical frame bar and the right vertical frame bar.

2. The spectrally selective transparent sunshade system according to claim 1, characterized in that: The driving mechanism includes a winding tube for rolling up the spectrally selective transparent sunshade, a tubular motor is installed in the winding tube, and the two ends of the tubular motor are respectively provided with a motor driving wheel and a motor crown wheel, a tail plug is provided at the left end of the winding tube, and a guide device for guiding the cable to pass out is provided at the outer end of the tail plug, and corner connectors are respectively inserted at the upper and lower ends of the left longitudinal frame bar and the right longitudinal frame bar, and the corner connector is adapted to the upper and lower transverse frame bars, and a cable clearance hole is provided on the corner connector located at the upper end of the left longitudinal frame bar, and the cable passes through the cable clearance hole and is connected to an external control box.

3. The spectrally selective transparent sunshade system according to claim 1, characterized in that: The guide rail member includes a guide rail installed inside the left longitudinal frame bar and the right longitudinal frame bar, the inner side wall of the guide rail is provided with a limiting guide groove, a clamping plate adapted to the limiting guide groove is provided at a distance at the rear end of the slider, a roller adapted to the limiting guide groove is provided on the slider between the two clamping plates, a connecting baffle is provided at the upper end of the slider, the bottom rail seal is fixedly connected to the front end of the connecting baffle, and the upper end of the slider is located behind the connecting baffle and is provided with a fixing hole for fixing the tensioning wire.

4. The spectrally selective transparent sunshade system according to claim 1, characterized in that: A wire adjuster is provided at the rear end of the connecting baffle, and the wire adjuster includes a cylindrical block fixedly connected to the connecting baffle, a wire winding groove is provided in the middle of the outer wall of the cylindrical block, a wire guide groove is opened at the upper end of the cylindrical block, the lower end of the wire guide groove extends to the lower side wall of the wire winding groove, and the wire guide groove is located on the extension line of the fixing hole.

5. The spectrally selective transparent sunshade system according to claim 1, characterized in that: The spectrally selective transparent sunshade includes a first scratch-resistant layer, an outer protective layer, a spectrally selective reflective insulation layer, a substrate layer, and a second scratch-resistant layer which are arranged in sequence. The spectrally selective reflective insulation layer includes a metal layer, a metal oxide layer, an acrylic polymer layer, and a silicone adhesive layer which are arranged in sequence from the substrate layer to the outside.

6. The spectrally selective transparent sunshade system according to claim 5, characterized in that: The substrate layer is a flexible transparent PET layer, the outer protective layer is a transparent PVC protective layer, the first scratch-resistant layer and the second scratch-resistant layer are both modified polyurethane layers, and the hardness of the modified polyurethane layer is ≥4H.

7. A spectrally selective transparent sunshade system according to claim 5 or 6, characterized in that: The thickness of the substrate layer is 4-12 mil, the thickness of the spectrally selective reflection heat insulation layer is 1 mil, the thickness of the outer protective layer is 3 mil, and the thickness of the first scratch-resistant layer and the second scratch-resistant layer are both 0.25 mil.

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