Silica gel projection screen

Abstract

A silica gel projection screen comprises a first surface (100), a second surface (101) and a plurality of tiny curved surface structures (1000). The second surface (101) is opposite the first surface (100). The micro curved surface structures (1000) are formed on the first surface (100). The silica gel projection screen is made of liquid silica gel and / or solid silica gel. And after the silica gel projection screen is folded for four times and is extruded for 24 hours by using a 2kg weight, the unfolded silica gel projection screen completely recovers from any crease within 30 minutes and is completely flat. The silica gel projection screen is foldable.

Description

Technical Field

[0001] The invention relates to the field of projection screens, and in particular to a foldable silicone projection screen. Background Art

[0002] In today's human society, projectors that use light to project images have been fully used in business, education, engineering, home theaters and professional theaters. With the advancement of optical and electronic technologies, projectors are becoming more miniaturized and portable, allowing people to use them in outdoor activities, camping or other common activities.

[0003] In order to provide a good projection picture, in addition to the improvement of the optical system of the projector itself, the quality of the projection screen is also one of the important keys. If the projection screen is not flat enough, the color is uneven or too smooth, it will affect the presentation effect of the picture. In order to improve portability, foldable soft screens are provided for people to use. However, the existing screens are prone to wrinkles and creases after folding, resulting in reduced picture quality. If the screen is stored in a curled manner, portability will be reduced. Therefore, how to provide a portable projection screen that does not affect the picture quality is one of the problems that technicians in this field want to solve.

[0004] US Patent No. 9,857,674 B2 discloses a foldable display device; US Patent No. 10,156,781 B2 discloses a foldable and portable display device.

[0005] Reference patents: R1, US3144889A; R2, US3560088A; R3, US4323301A; R4, US4432619A; R5, US5510862A; R6, US5838493A; R7, JP2000010196A; R8, US6034717A; R9, US6191886B1; R10, US6466369B1; R11, JP2003101909A; R12, DE20302079U1; R13, US6637896B2; R14, US20040057109A1; R15, DE10305497A1; R16, US6873460B1; R17, US20050174638A1; R18, US20060077356A1; R19, US20060234784A1; R20, US20060232610A1; R21, US20070171375A1; R22, JP2007264282A; R23, JP2008065018A; R24, NL1033809C2; R25, US20090190212A1; R26, US20100007950A1; R27, US20100045569A1; R28, JP2011095303A; R29, US20110132557A1; R30, US20110242501A1; R31, JP2012118548A; R32, US8313199B2; R33, JP2013142852A; R34, US3144899A; R35, US4017152A; R36, JPS5339552Y2; R37, FR2552896B1; R38, JPS62159134A; R39, JPH02282237A; R40, JPH04275538A; R41, JP2924410B2; R42, JPH07113999A; R43, JPH09230503A; R44, JP3086220B1; R45, CN2396678Y; R46, JP4148791B2; R47, JP2004279998A; R48, JP2005331898A; R49, DE202004015139U1; R50, JP2006227088A; R51, JP2008070749A; R52, JP2008070748A; R53, US7416316B2; R54, CN201025940Y; R55, JP5012420B2; R56, CN104076590B; R57, JP2015049483A; R58, CN106207483A;R59, USD828433S1; R60, USD869543S1; R61, TWI723056B; R62, CN111338173A; R63, CN113093459A. ; Summary of the invention

[0006] In order to solve the above-mentioned problem of picture quality and overcome the shortcomings of the prior art, the purpose of the present invention is to provide a wrinkle-resistant foldable silicone projection screen, which has good portability and can maintain good surface quality when unfolded.

[0007] The silicone projection screen of the embodiment of the present invention comprises a first surface, a second surface and a plurality of tiny curved structures. The second surface is opposite to the first surface. The tiny curved structures are formed on the first surface. The material of the silicone projection screen comprises liquid silicone and / or solid silicone. After the silicone projection screen is folded in half 4 times and pressed with a 2 kg weight for 24 hours, the unfolded silicone projection screen returns to being flat and crease-free within 30 minutes. The shape of the silicone projection screen is approximately rectangular.

[0008] In an embodiment of the present invention, the surface roughness of the first surface falls within a range of 0.6 to 0.9 micrometers.

[0009] In an embodiment of the present invention, the thickness of the silicone projection screen is in the range of 0.2 to 0.5 mm.

[0010] In an embodiment of the present invention, when the above-mentioned silicone projection screen projects an image at an illumination of 1000 lux in an environment with an ambient brightness of 500 lux, the contrast of the silicone projection screen is not less than 6.

[0011] In an embodiment of the present invention, the silicone projection screen is gray.

[0012] In an embodiment of the present invention, the density of the silicone projection screen is between 1 and 1.3 g / cm 3 .

[0013] A silicone projection screen according to another embodiment of the present invention comprises liquid silicone and / or solid silicone. The silicone projection screen also comprises diffuser powder and diluted black masterbatch. After the silicone projection screen is folded in half four times and then pressed with a 2 kg weight for 24 hours, the unfolded silicone projection screen returns to being flat and free of creases within 30 minutes.

[0014] In an embodiment of the present invention, the thickness of the silicone projection screen is in the range of 0.2 to 0.5 mm.

[0015] In an embodiment of the present invention, the ultimate tensile strength of the above-mentioned silicone projection screen falls within the range of 1.5 to 9.3 MPa.

[0016] In an embodiment of the present invention, the restoring force of the silicone projection screen is in the range of 59% to 85%.

[0017] In an embodiment of the present invention, the Shore hardness A of the silicone projection screen falls within the range of 20 to 60.

[0018] In an embodiment of the present invention, the light transmittance of the silicone projection screen is in the range of 30% to 95%.

[0019] In an embodiment of the present invention, when the above-mentioned silicone projection screen projects an image at an illumination of 1000 lux in an environment with an ambient brightness of 500 lux, the contrast of the silicone projection screen is not less than 6.

[0020] In an embodiment of the present invention, the material of the silicone projection screen includes a first solid silicone and a second solid silicone. The first solid silicone is different from the second solid silicone. When the weight of the first solid silicone is 100, the weight of the second solid silicone falls within the range of 3 to 300. The ultimate tensile strength of the first solid silicone falls within the range of 1.5 to 2.1 MPa, and the ultimate tensile strength of the second solid silicone falls within the range of 9.3 to 9.5 MPa.

[0021] In an embodiment of the present invention, the material of the silicone projection screen includes a third solid silicone. The first solid silicone, the second solid silicone and the third solid silicone are different from each other. When the weight of the first solid silicone is 100, the weight of the third solid silicone falls within the range of 1 to 6. The ultimate tensile strength of the third solid silicone falls within the range of 6.9 to 8.4 MPa.

[0022] In an embodiment of the present invention, the material of the silicone projection screen includes foamed liquid silicone and / or solid silicone.

[0023] In an embodiment of the present invention, the density of the silicone projection screen is between 1 and 1.3 g / cm 3 range.

[0024] The silicone projection screen of another embodiment of the present invention is mainly formed by liquid silicone, solid silicone, foamed liquid silicone or foamed solid silicone. The silicone projection screen includes a first surface and a second surface, and the second surface is opposite to the first surface. The first surface has a plurality of micro-curved structures to form a rough surface. The silicone projection screen is formed by injection molding, calendaring or molding. After the silicone projection screen is molded to verify the wrinkle resistance, it is folded in half 4 times and then squeezed with a 2 kg weight for 24 hours. The spread silicone projection screen returns to flatness within 30 minutes without creases.

[0025] As can be seen from the above, the silicone projection screen provided in the embodiment of the present invention has an anti-wrinkle effect, so the first surface can be restored to be flat after the silicone projection screen is folded four times. The silicone projection screen is suitable for compact folding and storage. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The following drawings are used to describe the embodiments of the present invention in more detail, wherein:

[0027] Figure 1 is a three-dimensional schematic diagram of a silicone projection screen in an embodiment of the present invention;

[0028] Figure 2 is a top view of a silicone projection screen in an embodiment of the present invention;

[0029] Figure 3 is based on Figure 2 A schematic cross-sectional view of the section line 2;

[0030] Figure 4 is based on Figure 3 A partial enlarged schematic diagram of

[0031] Figure 5 The silicone projection screen and the projector in the embodiment of the present invention are shown;

[0032] Figure 6 A silicone projection screen and a projector in another embodiment of the present invention are shown;

[0033] Figure 7 Shows a sample of a projection screen that has been unfolded after being pressed and then spread out for 30 minutes;

[0034] Figure 8 Another projection screen sample is shown after being stretched out for 30 minutes after being pressed again;

[0035] Fig. 9 A projection screen showing several images of a person being compressed and then unfolded for 30 minutes; and

[0036] Fig.10 Several projection screen samples are shown after being compressed and then unfolded for 30 minutes. DETAILED DESCRIPTION

[0037] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0038] In one embodiment of the present invention, the silicone projection screen includes one or more liquid silicone or one or more solid silicone, and the silicone projection screen is foldable. The silicone projection screen also includes diffuser powder and diluted black masterbatch, and the manufacturing method of the silicone projection screen includes a mixing process and a molding process.

[0039] The material of the light-scattering powder can be, for example, titanium dioxide (titanium dioxide), a transparent or translucent polymer, or a transparent or translucent silicone, and the light-scattering powder can be added to the silicone during the mixing process, so that the silicone projection screen has better light transmission and reflection effects. Further, because the silicone projection screen has light-scattering powder, when the projector projects a picture or video onto the silicone projection screen in a rear projection manner, the central hot spot will be minimized. In other embodiments, the silicone projection screen with light-scattering powder can also minimize the hot spot when the projector projects a picture or video in a front projection manner. The mixing process includes mixing using a rotary mixer, a double-roll grinder, or a triple-roll grinder.

[0040] During the mixing process, concentrated black masterbatch can also be added to the silicone to make the silicone projection screen appear gray. Therefore, when the projector projects images or videos onto the gray silicone projection screen, the silicone projection screen can present realistic high-contrast images.

[0041] Specifically, in the silicone projection screen of this embodiment, when the weight of liquid silicone and / or solid silicone is 100, the weight of the light-scattering powder is 2, and the weight of the concentrated black masterbatch is not less than 0.02. Through this combination, the silicone projection screen can have good light transmission and reflection effects, minimal bright spots, and at the same time have appropriate colors for the projector to project pictures and videos.

[0042] In this embodiment, the forming process includes compression molding. After the mixing process is completed, the material including solid silicone or liquid silicone can be formed into a silicone projection screen by compression molding. In other embodiments, the forming process can include injection molding or calendaring. In other words, different embodiments can be made of liquid silicone, solid silicone, or a combination of the two using one, two, or all three manufacturing processes (compression molding, injection molding, and calendaring).

[0043] After the silicone projection screen of this embodiment is folded four times and then pressed with a 2 kg weight for 24 hours, the silicone projection screen spread horizontally can be restored to be flat and free of creases within 30 minutes. Therefore, the silicone projection screen of this embodiment is suitable for compact storage, and the flatness of the screen during use will not be affected after folding.

[0044] Figure 1 is a three-dimensional schematic diagram of a silicone projection screen in an embodiment of the present invention; Figure 2 is a top view of a silicone projection screen in an embodiment of the present invention; Figure 3 is based on Figure 2 A schematic cross-sectional view of the section line 2; Figure 4 Based on Figure 3 For the sake of clarity, Figure 1The thickness of the silicone projection screen is shown in an enlarged manner, which is not intended to limit the shape and size of the components of the present invention. In one embodiment of the present invention, the silicone projection screen 1 is foldable. The silicone projection screen 1 includes a first surface 100, a second surface 101, and a plurality of tiny curved structures 1000. The first surface 100 is opposite to the second surface 101, and the tiny curved structures 1000 are formed on the first surface 100 to form a desired rough surface.

[0045] Figure 5 The silicone projection screen and the projector in the embodiment of the present invention are shown in the front projection. The projector 2 projects the image onto the first surface 100, so that the user 3 can observe the image on the side adjacent to the first surface 100. Specifically, in the front projection system, the silicone projection screen 1 can provide the first surface 100 as an image display surface. The silicone projection screen has a plurality of tiny curved structures 1000, which enable the displayed image to have a good viewing angle, thereby presenting a high-quality image.

[0046] In this embodiment, the material of the silicone projection screen 1 includes liquid silicone and / or solid silicone. For example, in an embodiment of the present invention, the silicone projection screen 1 can be made of at least one liquid silicone by injection molding; in another embodiment of the present invention, the silicone projection screen 1 can be made of at least one liquid silicone by injection molding; in another embodiment of the present invention, the silicone projection screen 1 can be made of at least one solid silicone by calendering. Specifically, the calendering method includes passing the raw silicone through a plurality of metal rollers, which pressurize and heat the raw silicone by rolling to form a sheet-like silicone projection screen. In another embodiment of the present invention, the silicone projection screen 1 can be made of at least one solid silicone by compression molding; in another embodiment of the present invention, the silicone projection screen 1 can be made of at least one solid silicone by injection molding.

[0047] After extrusion to verify the wrinkle resistance, the silicone projection screen in this embodiment can be restored to flatness without creases within 30 minutes after being folded 4 times and squeezed with a 2 kg weight for 24 hours. Therefore, the silicone projection screen in this embodiment can be stored compactly, and the folded silicone projection screen will not affect the flatness during use.

[0048] In this embodiment, the first surface 100 of the silicone projection screen 1 has no other surface disposed on top thereof, and the second surface 101 has no other surface disposed on top thereof.

[0049] Please refer to Figure 5When the first surface 100 of the silicone projection screen 1 is used as the image display surface, the projector can project images or videos onto the first surface 100, thereby achieving high-quality projection. The first surface 100 of the silicone projection screen 1 has a plurality of tiny curved structures 1000, so the first surface 100 can provide a good light scattering effect while avoiding dust absorption.

[0050] Figure 6 The figure shows a silicone projection screen and a projector during rear projection in another embodiment of the present invention. In this embodiment, the projector 2 can project onto the second surface 101. The projection light passes through the silicone projection screen 1, and the user 3 can observe the projected image on one side of the first surface 100. The first surface 100 has a plurality of tiny curved structures 1000, so that the first surface 100 has a good light scattering effect to obtain a good image quality.

[0051] Please refer to Figure 3 On the first surface 100, these tiny curved structures 1000 form a plurality of convex structures (troughs) 1001. The troughs 1001 on the first surface 100 have an average height h. The height h may be greater than 0.3 micrometers, so that the first surface 100 has a good light scattering effect, thereby providing a projection image with a wide viewing angle.

[0052] Specifically, the micro curved structures 1000 on the first surface 100 can be made by a mold. After the solid silicone or liquid silicone is kneaded and mixed, the raw silicone is squeezed into the mold to form the silicone projection screen 1 having the first surface 100 and the second surface 101 .

[0053] In the mold for making the silicone projection screen 1, the mold for making the first surface 100 has a plurality of circular protruding microstructures; the mold for making the second surface 101 has a smooth surface. In other embodiments, the mold for making the second surface 101 also has a plurality of circular protruding microstructures, so that both the first surface 100 and the second surface 101 of the silicone projection screen 1 have a plurality of microprotruding structures. Such a silicone projection screen can provide a good light scattering effect on both sides.

[0054] Further, the surface roughness of the first surface 100 of the present embodiment falls within the range of 0.6 to 0.9 micrometers. Specifically, on the first surface 100, the distance between two troughs in the micro-curved surface structures 1000 falls within the range of 0.6 to 0.9 micrometers. Therefore, the first surface 100 can provide a projection image with a good viewing angle.

[0055] Furthermore, in this embodiment, a silicone oil spraying process may be performed on the first surface 100 after the forming process. The oil spraying on the first surface 100 further reduces hot spots.

[0056] In an embodiment of the present invention, the material of the silicone projection screen 1 also includes astigmatism powder. The astigmatism powder is a white powder, and its material may include titanium dioxide (titanium dioxide), a transparent or translucent polymer, or a transparent or translucent polymer silicone. The transparent or translucent polymer may include polycarbonate (PC), but the present invention is not limited thereto. In other embodiments, the transparent or translucent polymer may include polyethylene terephthalate (PET), polymethyl methacrylate (PMMA) or polyvinyl chloride (PVC). Using these astigmatism powders, the silicone projection screen 1 can obtain a high-quality projection image with a wide viewing angle and minimal bright spots.

[0057] In the embodiment of the present invention, the material of the silicone projection screen 1 also includes a black masterbatch, so that the silicone projection screen 1 appears gray to provide a high-contrast projection image. For example, in the silicone projection screen 1 of this embodiment, when the weight of the silicone is 100, the weight of the astigmatism powder is 2, and the weight of the black masterbatch is not less than 0.02, so the silicone projection screen 1 can obtain a better projection image.

[0058] In an embodiment of the present invention, the material of the silicone projection screen 1 may further include an anti-wrinkle additive. The main component of the anti-wrinkle additive is a clay material. When the weight of the silicone is 100, the weight of the anti-wrinkle additive is 1. By adding the anti-wrinkle additive, the silicone projection screen 1 can have better anti-wrinkle ability. After being folded and stored for a long time, the unfolded silicone projection screen 1 can provide a flat projection plane without creases.

[0059] Furthermore, in an embodiment of the present invention, when the screen size is 0.2 m 2 The weight of the silicone projection screen 1 is in the range of 250 to 325 g. At the same time, the density of the silicone projection screen 1 is in the range of 1 to 1.3 g / cm 3 Therefore, the silicone projection screen 1 is easy to carry. However, the present invention is not limited to the above weight. In other embodiments, the silicone projection screen 1 can be designed to have a larger area and weight as required.

[0060] In an embodiment of the present invention, the thickness T1 of the silicone projection screen 1 falls within the range of 0.2 to 0.5 mm. The silicone projection screen 1 is easy to fold and store, while presenting a high-quality projection image. In this embodiment, the silicone projection screen 1 is suitable for use in front projection. The image light L1 is directly irradiated to the first surface 100, and the audience faces the first surface 100 to observe the image.

[0061] Please refer to Figure 6 In other embodiments, the silicone projection screen 1 is suitable for use in rear projection. When the audience faces the first surface 100 to observe the image, the image light L2 is projected onto the second surface 101. Further, the total light transmittance of the silicone projection screen 1 of this embodiment is 90%, so it can provide a high-quality projection image in rear projection. In some embodiments of the present invention, the total light transmittance of the silicone projection screen 1 can fall within the range of 30% to 95% to provide a high-quality projection image.

[0062] When the image light L2 with an illumination of 1000 lux is irradiated onto the silicone projection screen 1 in an environment with an ambient brightness of 500 lux, the contrast of the silicone projection screen is not less than 6. In other words, when the silicone projection screen is used in the rear projection mode, the contrast of the image presented by it is not less than 6.

[0063] In detail, the contrast ratio CR is calculated as follows:

[0064]

[0065] Where T is the total light transmittance of the silicone projection screen; R is the reflectivity of the silicone projection screen; L p is the projection illuminance; L a The contrast ratio of the silicone projection screen in this embodiment when presenting a picture is not less than 6, so it can provide a high-quality projection image.

[0066] In the embodiment of the present invention, the ultimate tensile strength of the silicone projection screen 1 falls within the range of 1.5 to 9.3 MPa. Therefore, the silicone projection screen 1 of the present embodiment can be appropriately stretched and extended to form a plane for projection without causing damage.

[0067] The restoring force of the silicone projection screen 1 of this embodiment falls within the range of 59% to 85%. The restoring force described here is the percentage of elastic potential energy that the material can absorb without permanent deformation. Since the silicone projection screen of this embodiment has a high restoring force, the silicone projection screen can be restored to be flat and without creases after being folded.

[0068] On the other hand, the Shore hardness A of the silicone projection screen 1 of this embodiment falls within the range of 20 to 60. The silicone projection screen 1 is soft and has excellent elasticity, suitable for users to fold and store. The silicone projection screen 1 also has sufficient restoring force and can provide a flat surface without creases.

[0069] In another embodiment of the present invention, the material of the silicone projection screen 1 may include a first solid silicone and a second solid silicone. The first solid silicone is different from the second solid silicone. When the weight of the first solid silicone is 100, the weight of the second solid silicone falls within the range of 33 to 300. The ultimate tensile strength of the first solid silicone falls within the range of 1.5 to 2.1 MPa, and the ultimate tensile strength of the second solid silicone falls within the range of 9.3 to 9.5 MPa. Therefore, the silicone projection screen 1 of this embodiment can be appropriately stretched and extended to form a plane for projection without causing damage.

[0070] Meanwhile, the restoring force of the first solid silicone falls within the range of 65% to 85%, and the restoring force of the second solid silicone falls within the range of 25% to 40%. Therefore, by mixing the first solid silicone and the second solid silicone, the silicone projection screen 1 can be restored to be flat after being folded and pressed.

[0071] In this embodiment, the first solid silica gel and the second solid silica gel are mixed by a double-roll mill, and then the mixture is sent into the double-roll mill to be heated and flattened to form the silica gel projection screen 1. For example, the solid silica gel can be heated to 150 degrees Celsius. In other embodiments, the calendering temperature can fall within the range of 100 degrees Celsius to 200 degrees Celsius.

[0072] In an embodiment of the present invention, the material of the silicone projection screen may further include a third solid silicone. The first solid silicone, the second solid silicone and the third solid silicone are different from each other. When the weight of the first solid silicone is 100, the weight of the third solid silicone falls within the range of 1 to 6.

[0073] The ultimate tensile strength of the third solid silicone falls within the range of 6.9 to 8.4 MPa. Therefore, the silicone projection screen 1 can still have an appropriate ultimate tensile strength and can be appropriately stretched and extended to form a plane for projection without causing damage.

[0074] The third solid-state silicone can enhance the wrinkle resistance of the silicone projection screen 1. The recovery force of the third solid-state silicone falls within the range of 55% to 66%. Compared with the first solid-state silicone, the third solid-state silicone has a lower recovery force. Compared with the second solid-state silicone, the third solid-state silicone has a higher recovery force. Therefore, by adding the third solid-state silicone, the wrinkle resistance of the silicone projection screen 1 can be improved, so that the silicone projection screen 1 can be restored to flatness faster after being folded.

[0075] The silicone projection screen 1 includes a first solid silicone, a second solid silicone and a third solid silicone. The three silicone compositions are mixed by a double-roll grinder and formed by a calendering process, so that the above compositions are heated, extruded, stretched and formed into a silicone projection screen 1 with an appropriate thickness.

[0076] On the other hand, the elongation at break of the first solid silicone of this embodiment falls within the range of 50% to 300%, the elongation at break of the second solid silicone falls within the range of 480% to 700%, and the elongation at break of the third solid silicone falls within the range of 310% to 400%. Therefore, the silicone projection screen 1 has good toughness and elasticity, and is suitable for folding and extending into a flat surface.

[0077] The Shore hardness A of the first solid silicone of this embodiment is not less than 33, the Shore hardness A of the second solid silicone is not higher than 52, and the Shore hardness A of the third solid silicone is also not higher than 52. For example, in one embodiment of the present invention, the Shore hardness A of the first solid silicone is 33, the Shore hardness A of the second solid silicone is 52, and the Shore hardness A of the third solid silicone is also 52, so the silicone projection screen 1 can have the desired softness.

[0078] In another embodiment of the present invention, the material of the silicone projection screen 1 may include foamed liquid silicone or foamed solid silicone. Specifically, the material of the silicone projection screen 1 may include silicone, a foaming agent, and a curing agent, and the silicone projection screen 1 is formed by a process of calendering, molding, or injection.

[0079] In this embodiment, the density of the silicone projection screen 1 is between 300 and 700 kg / m 3 Therefore, the silicone projection screen 1 is easy to carry, will not break after being folded or squeezed, and also has good durability and wrinkle resistance.

[0080] The material of the silicone projection screen 1 of this embodiment may also include diffuser, black masterbatch, and anti-wrinkle additives. The diffuser is, for example, titanium dioxide (titanium dioxide), a transparent or translucent polymer, or a transparent or translucent polymer silicone. The weight percentage of diffuser in the material of the silicone projection screen 1 falls within the range of 0.5% to 2%. The silicone projection screen 1 with diffuser can present sufficient reflectivity on the first surface 100, that is, it is suitable for use in front projection. The diffuser can provide good scattering ability in the silicone projection screen 1, and is therefore also suitable for use in rear projection to minimize bright spots.

[0081] The black masterbatch can change the color of the silicone projection screen 1 to a color suitable for high-quality projection images. The anti-wrinkle additive can further enhance the anti-wrinkle ability of the silicone projection screen 1.

[0082] The silicone projection screen 1 may also include a rough surface structure. Through additional processing, the silicone projection screen 1 of this embodiment may form a rough surface structure, thereby providing a good light scattering effect, thereby having a larger viewing angle during projection.

[0083] Figure 7 and Figure 8 Several examples of the present invention are compared side by side. Figure 7 and Fig. 9 All of them show some projection screens that were unfolded after being pressed for 30 minutes. Figure 7 The silicone projection screen 1 in the figure is made of solid silicone with a restoring force of 37%. After being folded four times and squeezed with a 2 kg weight for 24 hours, the unfolded surface still has creases after 30 minutes. Figure 8 The silicone projection screen 1 is made of the first solid silicone and the second solid silicone in the same proportion, and the restoring force after mixing is 61%, which falls within the range of 59% to 85%. Figure 8 After the silicone projection screen 1 was folded in half four times and pressed with a 2 kg weight for 24 hours, the unfolded surface returned to being flat without any creases after 30 minutes.

[0084] Fig. 9 and Fig.10 Several examples of the present invention are compared side by side. Fig. 9 and Fig.10 A projection screen showing some of the things being unfolded after being pressed down for 30 minutes. Fig. 9 The silicone projection screen 1 in the figure is made of liquid silicone with a restoring force of 34%. After being folded four times and squeezed with a 2 kg weight for 24 hours, the unfolded surface still has creases after 30 minutes. Fig.10 The silicone projection screen 1 is made of liquid silicone having a restoring force of 61%, which falls within the range of 59% to 85%. Fig.10 After the silicone projection screen 1 was folded in half four times and pressed with a 2 kg weight for 24 hours, the unfolded surface returned to being flat without any creases after 30 minutes.

[0085] By comparison, when the restoring force in the embodiment of the present invention falls within the range of 59% to 85%, the silicone projection screen can be restored to flatness within 30 minutes after being unfolded from the folded state without generating creases.

[0086] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for testing the wrinkle resistance of a silicone sheet, comprising: Fold the sheet in half 4 times; The folded sheet was pressed with a 2 kg weight for 24 hours; Unrolling the sheet and placing it on a flat surface; and If the crease of the spread sheet disappears after 30 minutes of observation, the test is successful.

2. A foldable, crease-free silicone projection screen produced by the method of claim 1, characterized in that: The silicone projection screen comprises: a first surface; a second surface, opposite to the first surface; and A plurality of tiny curved structures are formed on the first surface; The material of the silicone projection screen includes one or more of liquid silicone, solid silicone, foamed liquid silicone and foamed solid silicone.

3. The silicone projection screen according to claim 2, characterized in that: Also includes: one or more diffusers; and Black masterbatch.

4. The silicone projection screen according to claim 2, characterized in that: The materials also include: The first solid silica gel has an ultimate tensile strength ranging from 1.5 to 2.1 MPa. The second solid silica gel has an ultimate tensile strength in the range of 9.3 to 9.5 MPa, wherein The weight of the first solid silica gel is 100 parts, and the weight of the second solid silica gel falls within the range of 33 to 300 parts.

5. The silicone projection screen according to claim 4, characterized in that: The materials also include: Different third solid silicones have a recovery force ranging from 55% to 66%, wherein When the weight of the first solid silica gel is 100 parts by weight, the weight of the third solid silica gel falls within the range of 1 to 6 parts by weight.

6. The silicone projection screen according to claim 2, 3 or 4, characterized in that: The silicone projection screen appears grey.

7. The silicone projection screen according to claim 2, 3 or 4, characterized in that: The density of the silicone projection screen falls between 1 and 1.3 g / cm 3 range.

8. The silicone projection screen according to claim 2, 3 or 4, characterized in that: The surface roughness of the first surface falls within a range of 0.6 to 0.9 micrometers.

9. The silicone projection screen according to claim 2, 3 or 4, characterized in that: The thickness of the silicone projection screen falls within the range of 0.2 to 0.5 mm.

10. The silicone projection screen according to claim 2, 3 or 4, characterized in that: The ultimate tensile strength of the silicone projection screen falls within the range of 1.5 to 9.3 MPa.

11. The silicone projection screen according to claim 2, 3 or 4, characterized in that: The restoring force of the silicone projection screen falls within the range of 59% to 85%.

12. The silicone projection screen according to claim 2, 3 or 4, characterized in that: The Shore A hardness of the silicone projection screen falls within the range of 20 to 60.

13. The silicone projection screen according to claim 2, 3 or 4, characterized in that: The light transmittance of the silicone projection screen falls within the range of 30% to 95%.

14. The silicone projection screen according to claim 2, 3 or 4, characterized in that: When the silicone projection screen projects an image at an illumination of 1000 lux in an environment with an ambient brightness of 500 lux, the contrast ratio of the silicone projection screen is equal to or greater than 6.

15. The silicone projection screen according to claim 2, 3 or 4, characterized in that: The silicone projection screen also includes: Anti-wrinkle additive.

16. A foldable, crease-free silicone projection screen produced by the method of claim 1, characterized in that: The silicone projection screen comprises: a first surface; a second surface, opposite to the first surface; A plurality of tiny curved structures are formed on the first surface; Black masterbatch; Diffuser; and It involves mixing and extruding one or more materials from liquid silicone or solid silicone.

17. A foldable, crease-free silicone projection screen produced by the method of claim 1, characterized in that: The silicone projection screen comprises: a first surface; a second surface, opposite to the first surface; A plurality of tiny curved surface structures are formed on the first surface and the second surface; Liquid silicone or solid silicone; Diffuser; and Black masterbatch.

Images