A substrate-free privacy film

Abstract

This utility model relates to the field of privacy film technology, and in particular to a substrate-free privacy film, comprising a privacy film body, an optical adhesive layer on the back end of the privacy film body, a release film layer on the end of the optical adhesive layer away from the privacy film body, a waterproof main strip on the lower surface of the privacy film body, a drainage side guide strip on the waterproof main strip, a pull tab on the upper end of the release film layer, and anti-detachment strips at both ends of the release film layer. The surfaces of the waterproof main strip and the drainage side guide strip are coated with a hydrophobic and diffusing coating. An adhesive layer is provided on the pull tab, and a smooth coating is provided on the inner wall of the anti-detachment strip. The privacy film body is made of silica nanoparticle coating. This improves the water resistance of the privacy film body for business tablets at the connection between the main screen and the default keyboard, and improves the resistance to pull-out of the release film layer on the initially purchased privacy film body.

Description

Technical Field

[0001] This utility model relates to the field of privacy film technology, and in particular to a substrate-free privacy film. Background Technology

[0002] Business tablets are smart devices designed for efficient office work and mobile business scenarios. Sometimes, business people use business tablets in public places. To prevent the screen of the business tablet from being spied on, a non-material privacy screen protector is usually attached to the screen.

[0003] Substrate-free privacy films do not require the use of traditional PET substrates. The main body of the privacy film is generally composed of a privacy nano-film coating, an optical adhesive layer, and a disposable release film layer.

[0004] Currently, existing business tablet computers generally consist of a main screen, a matching preset keyboard, and a damped hinge. When in use, after the main screen and preset keyboard are aligned, the damping effect of the hinge allows the main screen to tilt, making it convenient for business personnel to view and operate the main screen.

[0005] When existing business tablets are placed on a table for use, business people often hold a water glass to drink water. If they are not careful, the arm holding the water glass may be hit by an external force, and the water in the glass may spill onto the main screen. Due to gravity, the accumulated water will slide down the surface of the privacy film on the main screen and accumulate at the preset keyboard below. The water may seep into the internal part of the connection between the main screen and the preset keyboard, which greatly reduces the water resistance of the privacy film on the business tablet for the preset keyboard connection.

[0006] Furthermore, upon initial purchase, the privacy screen protector comes with a pre-installed release liner on its optical adhesive layer. A pull tab is pre-installed on this release liner; by pulling the tab, the release liner can be peeled off and then adhered to the main screen via the optical adhesive layer. However, the pull tab is usually exposed. When taken out of the packaging and before any adhesion is performed, the pull tab can be subjected to external pressure or pulling force, causing the release liner to detach from the privacy screen protector. This affects the normal operation of the screen and reduces the tear resistance of the release liner on the initial privacy screen protector.

[0007] Therefore, we designed a substrate-free privacy screen protector for business tablets to meet the needs of practical applications. Utility Model Content

[0008] The purpose of this invention is to address the aforementioned shortcomings in the existing technology by proposing a substrate-free privacy film.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] Design a substrate-free privacy film, including a privacy film body, an optical adhesive layer on the back end of the privacy film body, a release film layer on the end of the optical adhesive layer away from the privacy film body, a waterproof main strip on the lower surface of the privacy film body, a drainage side guide strip on the waterproof main strip, a pull tab on the upper end of the release film layer, and anti-detachment strips on both ends of the release film layer;

[0011] The surfaces of the waterproof main strip and the drainage side strip are provided with a hydrophobic and flow-guiding coating.

[0012] The pull tab is provided with an adhesive layer, and the inner wall of the anti-detachment hook strip is provided with a smooth coating.

[0013] In detail, the privacy film body is a silicon dioxide nanoparticle coating, and the optical adhesive layer is an acrylic ester coating layer.

[0014] In detail, the drainage side guide strip consists of two symmetrical strips, with an angle of 100 degrees between them and the main waterproof strip, enabling the water accumulated on the main waterproof strip to be quickly discharged to both sides.

[0015] In detail, the hydrophobic guiding coating is made of fluorosilane and has a thickness of 30 to 40 nanometers, and the drainage side guide strip and the waterproof main guide strip are both made of PDMS polydimethylsiloxane, which has excellent resilience.

[0016] In detail, the anti-detachment hook strip consists of two symmetrical strips, and both the pull tab and the anti-detachment hook strip have a bent hook-shaped structure and are made of TPU thermoplastic elastomer material, which has high resilience and good flexibility.

[0017] In detail, the adhesive layer is applied to the inner wall surface of the pull sheet. The adhesive layer is made of silicone pressure-sensitive adhesive and has a thickness of five to six micrometers. Silicone pressure-sensitive adhesive is durable.

[0018] In detail, the smooth coating is an organosilicon coating with a thickness of fifty to sixty nanometers, and the surface of the organosilicon coating material is flat and smooth.

[0019] The design scheme proposed in this utility model has the following beneficial effects in application:

[0020] 1. This utility model improves the water resistance of the privacy film body for the connection between the main screen and the keyboard of a business tablet computer by setting a waterproof main strip with drainage side guide strips on the main body of the privacy film body, and setting a hydrophobic guiding coating on the upper surface of both the waterproof main strip and the drainage side guide strips. If a business person accidentally bumps their arm while holding a water cup and spills water onto the main screen, the water will slide down the surface of the privacy film body attached to the main screen due to gravity, flow into the waterproof main strip, and finally drain out to both sides through the drainage side guide strips along the hydrophobic guiding coating.

[0021] 2. This utility model, by setting a bent hook-type pull tab with an adhesive layer and a symmetrical anti-detachment hook strip structure, not only achieves elastic and stable anti-detachment hooking of the release film layer on both sides of the privacy film body when the privacy film body is purchased, but also ensures that the pull tab bent hook is fixed to the surface of the privacy film body. This effectively avoids the situation where the pull tab is subjected to external squeezing and pulling force when the privacy film body is taken out of the purchase box, causing the release film layer to detach from the privacy film body. This also avoids the optical adhesive layer surface getting dirty, which would affect the normal operation of the main screen after bonding. It improves the anti-pull-off performance of the release film layer on the initially purchased privacy film body. Attached Figure Description

[0022] Figure 1 This is a first-view perspective three-dimensional schematic diagram of the privacy film body and the release film layer of this utility model in an unattached state.

[0023] Figure 2 This is a second-view perspective three-dimensional schematic diagram of the privacy film body and the release film layer of this utility model in an unattached state.

[0024] Figure 3 This is a three-dimensional schematic diagram of the privacy film body and release film layer of this utility model in the bonded state.

[0025] Figure 4 This is a top view schematic diagram of the release film layer with anti-slip strip of this utility model;

[0026] Figure 5 This is a three-dimensional schematic diagram of the privacy film body of this utility model;

[0027] Figure 6 For the present utility model Figure 5 A magnified view of a portion of point Y in the middle.

[0028] In the diagram: 1. Privacy film body; 11. Optical adhesive layer; 2. Waterproof main strip; 3. Drainage side guide strip; 4. Hydrophobic guiding coating; 5. Release film layer; 51. Pull tab; 52. Adhesive layer; 6. Anti-slip strip; 7. Smooth coating. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0030] Reference Figures 1-6 A substrate-free privacy film includes a privacy film body 1, an optical adhesive layer 11 is provided on the back end of the privacy film body 1, a release film layer 5 is provided on the end of the optical adhesive layer 11 away from the privacy film body 1, a waterproof main strip 2 is provided on the lower surface of the privacy film body 1, a drainage side guide strip 3 is provided on the waterproof main strip 2, a pull tab 51 is provided on the upper end of the release film layer 5, and anti-detachment strips 6 are provided at both ends of the release film layer 5.

[0031] The surfaces of the waterproof main strip 2 and the drainage side strip 3 are provided with a hydrophobic guiding coating 4;

[0032] An adhesive layer 52 is provided on the pull tab 51, and a smooth coating 7 is provided on the inner wall of the anti-detachment hook strip 6. The privacy film body 1, optical adhesive layer 11, and release film layer 5 described in this patent are a set, which is a substrate-free privacy film, which is the prior art.

[0033] For the business tablet computer described in this patent, please refer to the appendix. Figure 5 and Figure 6 It consists of a main screen, a matching preset keyboard, and a damping hinge. When in use, after the main screen and the preset keyboard are aligned, the damping effect of the hinge allows the main screen to tilt, making it convenient for business personnel to view and operate the main screen. This is existing technology, and the relevant structure has not been drawn and need not be described in detail.

[0034] The pull tab 51, anti-detachment strip 6, waterproof main strip 2, drainage side guide strip 3, and hydrophobic guiding coating 4 described in this patent are bonded to their corresponding connection structures by a high light transmittance silicone pressure-sensitive adhesive.

[0035] The pull sheet 51 is made of soft PET film, which is high-strength and tear-resistant.

[0036] It should be further noted that the privacy screen protector body 1 is made of silicon dioxide nanoparticle coating, which softens light, reduces moiré patterns and glare when viewed directly, and has a privacy effect with high light transmittance.

[0037] The optical adhesive layer 11 is an acrylic coating layer with high light transmittance, which enables it to be firmly bonded to the main screen surface of the business tablet computer.

[0038] It should be further noted that there are two symmetrical drainage guide strips 3 on the left and right, and the angle between them and the main waterproof strip 2 is 100 degrees. At the same time, the central surface of the main waterproof strip 2 is raised, so that the water accumulated in the main waterproof strip 2 can be quickly discharged to both sides.

[0039] It should be further noted that the hydrophobic guiding coating 4 is made of fluorosilane and has a thickness of 30 to 40 nanometers. Fluorosilane has strong durability, excellent hydrophobicity, and a smooth, low-friction surface.

[0040] Both the drainage side guide strip 3 and the waterproof main guide strip 2 are made of PDMS (polydimethylsiloxane). PDMS has excellent resilience and is durable. When the preset keyboard is folded open, the drainage side guide strip 3 and the waterproof main guide strip 2, which have been compressed, will spring back to their original shape. Please refer to the attached document. Figure 6 .

[0041] It should be further noted that there are two anti-slip hook strips 6 that are symmetrical from left to right. Both the pull tab 51 and the anti-slip hook strip 6 are bent hook-shaped structures and are made of TPU thermoplastic elastomer material. TPU thermoplastic elastomer material has high resilience and good flexibility, which ensures a stable fastening effect between the privacy film body 1 and the release film layer 5.

[0042] It should be further noted that the adhesive layer 52 is applied to the inner wall surface of the pull tab 51. The adhesive layer 52 is made of silicone pressure-sensitive adhesive and has a thickness of five to six micrometers. The silicone pressure-sensitive adhesive is durable and will not leave any adhesive residue on the surface of the privacy film body 1 when the pull tab 51 is peeled off.

[0043] It should be further noted that the smooth coating 7 is an organic silicon coating with a thickness of fifty to sixty nanometers. The surface of the organic silicon coating is flat and smooth and will not cause wear to the privacy film body 1. When the privacy film body 1 is taken out of the packaging box, the anti-detachment hook strip 6 is pried open to the outside, and then the pull tab 51 is peeled off. Then the release film layer 5 can be peeled off from the back end of the privacy film body 1 for later bonding to the main screen surface of the business tablet computer.

[0044] Working method: The privacy screen protector 1 is bonded to the main screen surface of the business tablet computer via an optical adhesive layer 11 (business tablet computers are existing technology, and their default keyboards have a waterproof pad at the bottom). When using the business tablet computer, if a business person is not careful and their arm holding a water cup is hit by an external force, water from the cup may spill onto the main screen. Due to gravity, the accumulated water will slide down the surface of the privacy screen protector 1 attached to the main screen, flow into the waterproof main strip 2, and finally drain out to both sides through the drainage side strip 3 along the hydrophobic guiding coating 4. This improves the water resistance of the privacy screen protector 1 for the connection between the main screen and the default keyboard of the business tablet computer.

[0045] In addition, after initially purchasing the privacy screen protector body 1, upon opening the packaging box and taking out the privacy screen protector body 1, the pull tab 51 is firmly bonded to the surface of the privacy screen protector body 1 by the adhesive layer 52. Moreover, the symmetrical elastic anti-detachment hook strips 6 elastically and stably hook the two side walls of the privacy screen protector body 1, effectively preventing the release film layer 5 from detaching from the privacy screen protector body 1 due to external pressure and pulling force when taking the privacy screen protector body 1 out of the packaging box. This also prevents the surface of the optical adhesive layer 11 from getting dirty, which would affect the normal operation of the main screen after bonding. This improves the anti-pull-off performance of the release film layer 5 on the initially purchased privacy screen protector body 1.

[0046] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A substrate-free privacy film comprising a privacy film body (1), characterized in that: An optical adhesive layer (11) is provided on the back end of the privacy film body (1). A release film layer (5) is provided on the end of the optical adhesive layer (11) away from the privacy film body (1). A waterproof main strip (2) is provided on the lower surface of the privacy film body (1). A drainage side guide strip (3) is provided on the waterproof main strip (2). A pull tab (51) is provided on the upper end of the release film layer (5). Anti-slip strips (6) are provided at both ends of the release film layer (5). The surfaces of the waterproof main strip (2) and the drainage side strip (3) are provided with a hydrophobic guiding coating (4). An adhesive layer (52) is provided on the pull tab (51), and a smooth coating (7) is provided on the inner wall of the anti-detachment strip (6).

2. The substrate-free privacy film according to claim 1, characterized in that: The privacy film body (1) is a silicon dioxide nanoparticle coating, and the optical adhesive layer (11) is an acrylic coating layer.

3. The substrate-free privacy film according to claim 1, characterized in that: The drainage side guide strip (3) consists of two symmetrical strips, and the angle between them and the waterproof main guide strip (2) is 100 degrees.

4. The substrate-free privacy film according to claim 1, characterized in that: The hydrophobic guiding coating (4) is made of fluorosilane and has a thickness of 30 to 40 nanometers. The drainage side guide strip (3) and the waterproof main guide strip (2) are both made of PDMS polydimethylsiloxane.

5. The substrate-free privacy film according to claim 1, characterized in that: The anti-detachment hook strips (6) are two symmetrical strips, and both the pull tab (51) and the anti-detachment hook strips (6) are bent hook-shaped structures and are made of TPU thermoplastic elastomer material.

6. The substrate-free privacy film according to claim 1, characterized in that: The adhesive layer (52) is applied to the inner wall surface of the pull tab (51). The adhesive layer (52) is made of silicone pressure-sensitive adhesive and has a thickness of five to six micrometers.

7. The substrate-free privacy film according to claim 1, characterized in that: The smooth coating (7) is an organosilicon coating with a thickness of fifty to sixty nanometers.

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