Multi-layer composite high-adhesive-strength film
By introducing a multi-layer composite structure and reinforcing adhesive strips into the optical composite film, the problem of insufficient adhesive strength was solved, and the yield of cutting and assembly was improved.
Patent Information
- Application Number
- CN202520142598.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-21
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2035-01-21
AI Technical Summary
The existing optical composite films have insufficient bonding strength, resulting in low cutting yield and module assembly yield, and are prone to delamination and peeling problems.
It adopts a multi-layer composite structure, including a lower substrate layer, an upper substrate layer, a prism structure layer, and a reinforcing adhesive strip, and is bonded through an adhesive bonding layer to enhance the bonding strength.
It improves the adhesion strength of the diaphragm, reduces delamination and peeling, and improves the cutting yield and module assembly yield.
Smart Images
Figure CN223948775U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of optical film, concretely is a kind of multilayer composite high adhesive force film. BACKGROUND
[0002] Liquid crystal display technology is the mainstream technology of flat panel display, and liquid crystal display is widely used in mobile phones, tablet computers, displays, televisions and other display devices, in order to ensure the picture of liquid crystal module, multiple optical films such as prism film, diffusion film and microlens film must be used in backlight module, with the demand of ultra-clear and thin design of liquid crystal module, new requirements are put forward for the design of optical film sheet;
[0003] The current common practice is to adhere multiple optical films such as prism film, diffusion film and microlens film together to form an optical composite film by using adhesive, specifically by inserting the sharp corners of the prism into the adhesive to achieve adhesion. However, the film sheet formed by adhesion may have problems such as peeling and delamination due to low adhesion strength during subsequent cutting, assembly and use, resulting in low cutting yield of the film sheet, poor picture of the liquid crystal module and low assembly yield of the module. SUMMARY
[0004] The utility model aims at providing a kind of multilayer composite high adhesive force film to solve the problems raised in the above background technology.
[0005] To achieve the above object, the utility model provides the following technical scheme: a kind of multilayer composite high adhesive force film, comprising:
[0006] The lower substrate layer and the upper substrate layer are respectively provided with a prism structure layer and a glue connection layer on the corresponding side, and the side of the prism structure layer close to the glue connection layer is provided with a reinforced adhesive strip, and the reinforced adhesive strip is inserted into the glue connection layer.
[0007] The side of the lower substrate layer and the upper substrate layer away from each other is respectively provided with a lower structure coating and an upper structure coating.
[0008] Preferably, the lower substrate layer and the upper substrate layer are both made of PET structure, and the thickness is 38-300 μm
[0009] Preferably, the prism structure layer is an acrylic coating structure, the prism structure layer is a multi-triangular pyramid arrangement combination structure, the top angle is a plane, the height of the multi-triangular pyramid structure of the prism structure layer is equal, the reinforced adhesive strip is arranged at the upper end center of the prism structure layer, the ratio of the height of the prism structure layer to the stiffness of the reinforced adhesive strip is 50-10:1, and the maximum width of the reinforced adhesive strip is less than the upper end width of the prism structure layer.
[0010] Preferably, the side angle of the adjacent two triangular pyramids of the prism structure layer is 80-100°, and the cycle interval of the triangular pyramids is 30-100 μm.
[0011] Preferably, the thickness of the adhesive connecting layer is ≤10 μm, the adhesive connecting layer adopts acrylate resin, and the curing mode of the adhesive connecting layer adopts ultraviolet curing.
[0012] Preferably, the thickness of the lower structure coating is 2-10 μm, and the haze is 5%-60%.
[0013] Compared with the prior art, the utility model has the beneficial effects that:
[0014] By arranging the reinforcing adhesive strips capable of being connected with the adhesive connecting layer above the triangular pyramids of the prism structure layer, the adhesive strength of the layer pieces of the lower substrate layer and the upper substrate layer is increased by more than 10% than that of the prior art optical composite film, the adhesive strength is increased, the film product is not prone to delamination and peeling in subsequent cutting, assembling and use, and the cutting yield and the module assembling yield are improved. BRIEF DESCRIPTION OF DRAWINGS
[0015] Figure 1 It is a structural schematic view of the utility model;
[0016] Figure 2 It is a structural schematic view of the second embodiment of the utility model;
[0017] Figure 3 It is a structural schematic view of the third embodiment of the utility model;
[0018] Figure 4 It is a structural schematic view of the comparative example of the utility model.
[0019] In the drawing: the lower substrate layer 1, the upper substrate layer 2, the prism structure layer 3, the reinforcing adhesive strip 4, the adhesive connecting layer 5, the upper structure coating 6, and the lower structure coating 7. DETAILED DESCRIPTION
[0020] In order to make the purpose, technical scheme of the utility model clear and complete, and the advantages more clear and apparent, the following will be further described in detail by combining the embodiments of the utility model with the drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the utility model, rather than all the embodiments, and are only used to explain the embodiments of the utility model, and do not limit the embodiments of the utility model, and all other embodiments obtained by the ordinary skilled in the art without creative labor belong to the scope of protection of the utility model.
[0021] Please refer to the accompanying Figures 1-4 The application provides the following technical scheme.
[0022] Embodiment one: a multi-layer composite high-adhesion film, comprising a lower substrate layer 1 and an upper substrate layer 2, the corresponding sides of the lower substrate layer 1 and the upper substrate layer 2 are respectively provided with a prism structure layer 3 and an adhesive connecting layer 5, the side of the prism structure layer 3 close to the adhesive connecting layer 5 is provided with a reinforced adhesive strip 4, and the reinforced adhesive strip 4 is inserted into the adhesive connecting layer 5.
[0023] The sides of the lower substrate layer 1 and the upper substrate layer 2 away from each other are respectively provided with a lower structural coating layer 7 and an upper structural coating layer 6.
[0024] The lower substrate layer 1 and the upper substrate layer 2 are both made of PET structure, with a thickness of 38-300 μm, and the lower substrate layer 1 and the upper substrate layer 2 are given special properties by different coatings, and the lower substrate layer 1 and the upper substrate layer 2 are bonded by the adhesive connecting layer 5.
[0025] The prism structure layer 3 is an acrylic coating structure, the prism structure layer 3 is a multi-triangle pyramid arrangement structure, the reinforced adhesive strip 4 is arranged at the upper end center of the prism structure layer 3, the height of the prism structure layer 3 and the rigidity of the reinforced adhesive strip 4 are in a ratio of 50-10:1, the maximum width of the reinforced adhesive strip 4 is less than the upper end width of the prism structure layer 3, and the reinforced adhesive strip 4 can be a small triangle pyramid, a small high cuboid, or a small wide cuboid.
[0026] The side angle of the adjacent two triangle pyramids of the prism structure layer 3 is 80-100°, and the cycle distance of the triangle pyramids is 30-100 μm.
[0027] The thickness of the adhesive connecting layer 5 is ≤10 μm, the adhesive connecting layer 5 uses one or a combination of several of acrylate resin, polyurethane acrylate resin, polyester acrylate resin, and epoxy acrylate resin, and the curing method of the adhesive connecting layer 5 uses one of ultraviolet curing and thermal curing.
[0028] The thickness of the lower structural coating layer 7 is 2-10 μm, and the haze is 5%-60%, the lower structural coating layer 7 uses two coating methods of diffusion particle coating and matte rough surface coating without diffusion particles, and is coated by using diffusion particles + UV back coating glue curing, which can achieve an anti-sticking effect.
[0029] The coating structure of the upper structural coating layer 6 can be one of a triangle pyramid arrangement structure, a diffusion flat layer, or a microlens hemispherical arrangement structure.
[0030] When the upper structural coating layer 6 is a prism structure layer, the prism structure layer is a multi-triangle pyramid arrangement structure, the side angle of the adjacent two triangle pyramids is 80-100°, and the cycle distance is 10-100 μm.
[0031] Embodiment two, based on embodiment one, according to Figure 2 :
[0032] When the upper structure coating 6 is a diffusion coating, the haze range is 30% to 95%, and the reinforcing adhesive strip 4 is a small triangular pyramid structure.
[0033] Example Three, based on Example Two, according to Figure 3 :
[0034] When the upper structure coating 6 is a microlens coating, the front structure of the microlens coating is a hemispherical structure, and the structure radius is 10 to 100 μm.
[0035] The lower substrate layer 1 is adhered to the upper substrate layer 2 through the adhesive connection layer 5 coated on the back of the upper substrate layer 2, and then cured.
[0036] The product can be applied to liquid crystal display backlight modules, LED lamp groups, and other devices that require improved brightness and increased light propagation angles.
[0037] Comparative Example, according to Figure 4 : The thickness of the lower substrate layer 1 is 125 μm, the triangular pyramid structure spacing of the prism structure layer 3 is 60 μm, the angle between the two sides is 90°, the top of the prism structure layer 3 is a sharp corner structure, the thickness of the lower structure coating 7 is 5 μm, and the haze is 8%;
[0038] The upper structure coating 6 of the upper substrate layer 2 is a triangular pyramid prism layer, the thickness of the upper substrate layer 2 is 125 μm, the triangular pyramid structure spacing of the upper structure coating 6 is 24 μm, and the angle is 90°;
[0039] The adhesive connection layer 5 has a thickness of 2 μm and is coated on the upper substrate layer 2, and then the lower substrate layer 1 and the upper substrate layer 2 are adhered through the adhesive connection layer 5 and cured by ultraviolet light.
[0040] According to the above operation steps and requirements, test products are respectively made according to Example Two, Example Two, and Example Three, and the test products are tested. The test method is to cut the test product along the triangular pyramid direction of the lower substrate layer 1 and the prism structure layer 3 into a film strip with a width of 25 mm and a length of 150 mm, and test the adhesive strength in the 180° peeling direction. The measured values are as follows:
[0041] Embodiment Adhesion strength Example 1 360 g / inch Example 2 300 g / inch Example 3 350 g / inch Comparative Example 120 g / inch
[0042] The adhesive strength between the film layers is improved by more than 50% compared to the current optical composite film adhesive strength, which prevents the thin film product from delaminating, peeling, and other problems during subsequent cutting, assembly, and use, and improves the cutting yield and module assembly yield.
[0043] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A multilayer composite high-adhesion film, characterized in that, include: The lower substrate layer (1) and the upper substrate layer (2) are respectively provided with a prism structure layer (3) and an adhesive bonding layer (5) on the corresponding side of the lower substrate layer (1) and the upper substrate layer (2). The prism structure layer (3) is provided with a reinforcing adhesive strip (4) on the side close to the adhesive bonding layer (5), and the reinforcing adhesive strip (4) is inserted into the adhesive bonding layer (5). The lower substrate layer (1) and the upper substrate layer (2) are respectively provided with a lower structural coating (7) and an upper structural coating (6) on the side away from each other.
2. The multilayer composite high-adhesion film according to claim 1, characterized in that: Both the lower substrate layer (1) and the upper substrate layer (2) are made of PET structure with a thickness of 38~300μm.
3. The multilayer composite high-adhesion film according to claim 2, characterized in that: The prism structure layer (3) is an acrylic coating structure. The prism structure layer (3) is a multi-triangular pyramid arrangement structure with a plane at the apex. The multi-triangular pyramid structure of the prism structure layer (3) has equal height. The reinforcing adhesive strip (4) is located at the upper center of the prism structure layer (3). The ratio of the height of the prism structure layer (3) to the stiffness of the reinforcing adhesive strip (4) is 50~10:
1. The maximum width of the reinforcing adhesive strip (4) is less than the upper width of the prism structure layer (3).
4. The multilayer composite high-adhesion film according to claim 3, characterized in that: The included angle between the sides of two adjacent triangular pyramids in the prism structure layer (3) is 80~100°, and the cyclic spacing between the triangular pyramids is 30~100μm.
5. The multilayer composite high-adhesion film according to claim 4, characterized in that: The thickness of the adhesive bonding layer (5) is ≤10μm. The adhesive bonding layer (5) is made of acrylic resin and is cured by ultraviolet light.
6. The multilayer composite high-adhesion film according to claim 5, characterized in that: The thickness of the lower structure coating (7) is 2~10μm, and the haze is 5%~60%.