Diffuser plate multilayer co-extrusion equipment and production method thereof

Abstract

The present invention discloses a multilayer co-extrusion device for a diffusion plate and a production method thereof, comprising a co-extrusion die head, a first distributor, a second distributor and a third distributor, wherein the co-extrusion die head is provided with a first feed port, a second feed port and a third feed port, and the co-extrusion die head is provided with a discharge port; the first distributor has at least three distribution channels; the second distributor has at least one distribution channel; the third distributor is connected with a feeding mechanism, the second distributor has at least one distribution channel, and the first distributor, the second distributor and the third distributor are respectively connected with a feeding mechanism. The present invention sets a plurality of distributors, and the mixed raw materials are respectively added to the screw extrusion device for heating to form a molten state, and enter the corresponding distributor to form a preliminary layer structure, and the preliminary formed layer structure enters the co-extrusion die head to realize co-extrusion to form a multilayer composite structure, the process is simple, the cost is low, and rapid and large-scale mass production can be achieved, and it can be used to achieve efficient industrial production.

Description

Technical Field

[0001] The present invention belongs to the technical field of multi-layer co-extrusion equipment, and more specifically, relates to a diffusion plate multi-layer co-extrusion equipment and a production method thereof. Background Art

[0002] Light diffusers use chemical or physical means to utilize the physical phenomena of refraction, reflection and scattering when light encounters two media with different refractive indices (densities) during its journey. By adding inorganic or organic light diffusers to substrates such as PMMA, PC, PS, PP, hips, or by artificially adjusting the light through an array of micro-feature structures on the surface of the substrate, the light is refracted, reflected and scattered in different directions, thereby changing the path of light and achieving full dispersion of the incident light to produce an optical diffusion effect. There are three types of light diffusers, which are generally widely used in liquid crystal displays, LED lighting and imaging display systems.

[0003] Most existing light diffuser plates have a 3-5-layer structure. The general processing method is: the prepared raw materials for each layer are mixed evenly, the mixed raw materials are added to the screw extruder to heat to form a molten state, the corresponding structural layers are extruded, and then transported to the bonding station, all the structural layers are arranged and bonded to the preset positions, and then the multiple structural layers are pressed and bonded through the multi-layer co-extrusion equipment.

[0004] In addition to the above production methods, there is another production method: the mixed raw materials are added to the screw extruder equipment separately for heating to form a molten state, and then extruded through the multi-layer co-extrusion die head of the screw extruder equipment to form a multi-layer composite structure. However, this production method is generally suitable for the production of structural layers with less than 5 layers.

[0005] There is an urgent need for a multi-layer co-extrusion device and a production method for a diffusion plate with a structure of more than 5 layers. Summary of the invention

[0006] The main purpose of the present invention is to provide a diffuser plate multi-layer co-extrusion device and a production method thereof, so as to realize the co-extrusion production of a multi-layer composite structure, and can be used to quickly realize industrial production and large-scale application.

[0007] According to a first aspect of the present invention, there is provided a diffuser plate multilayer co-extrusion device, comprising:

[0008] A co-extrusion die head, wherein the upper end surface of the co-extrusion die head is provided with a first feed port, a second feed port and a third feed port, and the lower end surface of the co-extrusion die head is provided with a discharge port, wherein the first feed port, the second feed port and the third feed port are connected to the discharge port;

[0009] A first distributor, wherein the first distributor is installed on the first feed port, three feeding mechanisms are connected to the first distributor, and the first distributor has at least three distribution channels;

[0010] A second distributor, the second distributor is installed on the second feed port, a feeding mechanism is connected to the second distributor, and the second distributor has at least one distribution channel;

[0011] The third distributor is installed on the third feed port, the third distributor is connected with a feeding mechanism, and the second distributor has at least one distribution channel.

[0012] In a specific embodiment of the present invention, the first distributor is provided with a first outlet, a first distribution feed port, a second distribution feed port and a third distribution feed port, the first distribution feed port is connected to two first distribution channels, the second distribution inlet is connected to the second distribution channel, the third distribution inlet is connected to the third distribution channel, and the first distribution channel, the second distribution channel and the third distribution channel are connected to the first outlet.

[0013] In a specific embodiment of the present invention, two first distribution channels are arranged on both sides of the second distribution channel, and the two first distribution channels and the second distribution channel merge into a distribution branch channel, which is connected to the first outlet after merging with the third distribution channel.

[0014] In a specific embodiment of the present invention, the third distributor has the same structure as the first distributor, and three loading mechanisms are connected to the third distributor.

[0015] In a specific embodiment of the present invention, the co-extrusion die head includes a middle module, and a first module and a second module are respectively arranged on both sides of the middle module, after the first module is fixed on the middle module, a first channel is formed between the first module and the middle module, after the second module is fixed on the middle module, a third channel is formed between the second module and the middle module, and a fourth channel connected to the discharge port is formed between the first module and the second module, and a second channel connected to the second feed port is arranged on the middle module, and the fourth channel is respectively connected to the first channel, the second channel and the third channel.

[0016] In a specific embodiment of the present invention, the inner diameter of the fourth channel gradually decreases toward the discharge port, and the inner wall of the fourth channel is provided with a groove, which is close to the confluence of the first channel, the second channel and the third channel.

[0017] In a specific embodiment of the present invention, each of the feeding mechanisms includes a screw extruder, a single-plate double-station circular screen changer, a metering pump and a connector which are arranged in sequence, and the connector is connected to the corresponding distributor.

[0018] In a specific embodiment of the present invention, a traction mechanism is disposed below the co-extrusion die head, and the traction mechanism includes at least one traction roller and a traction motor driving the traction roller to rotate.

[0019] In a specific embodiment of the present invention, the first feed port, the second feed port and the third feed port are arranged at intervals along the width direction of the co-extrusion die, and the discharge port is arranged along the length direction of the co-extrusion die.

[0020] According to the second aspect of the present invention, a production method for multi-layer co-extrusion of a diffuser plate is provided, using the aforementioned multi-layer co-extrusion equipment for the diffuser plate, comprising the following steps: at least two materials enter a first distributor, a first surface layer and a first core board with at least two layers are formed in the first distributor, the first core board and the first core board form a second core board and then enter a co-extrusion die; the second core board is extruded in the co-extrusion die in combination with a third core board from the second distributor and a fourth core board from the third distributor to form a composite structure with at least 5 layers.

[0021] One of the above technical solutions of the present invention has at least one of the following advantages or beneficial effects: the present invention sets a plurality of distributors, respectively adds the mixed raw materials into the screw extrusion equipment for heating, forms a molten state, enters the corresponding distributor to form a preliminary layer structure, and the preliminary layer structure enters the co-extrusion die head to realize co-extrusion to form a multi-layer composite structure, the process is simple, the cost is low, and rapid and large-scale mass production can be achieved, and it can be used to achieve efficient industrial production. The present invention is suitable for the production of diffusion plates. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention is further described below in conjunction with the accompanying drawings and embodiments;

[0023] Figure 1 is a top view of an embodiment of the present invention;

[0024] Figure 2 is a side view of an embodiment of the present invention;

[0025] Figure 3 is a schematic structural diagram of a co-extrusion die head in one embodiment of the present invention;

[0026] Figure 4 is a cross-sectional view of a coextrusion die head in one embodiment of the present invention;

[0027] Figure 5 It is a schematic structural diagram of a first distributor in one embodiment of the present invention. DETAILED DESCRIPTION

[0028] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0029] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and 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 should not be understood as a limitation on the present invention.

[0030] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more features.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly stipulated and limited, the term "connection" should be understood in a broad sense. For example, it can be a fixed connection or a movable connection, a detachable connection or a non-detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be internal connection between two elements, indirect connection, or an interactive relationship between two elements.

[0033] The following disclosure provides many different embodiments or examples for implementing different solutions of the present invention.

[0034] Reference Figures 1 to 5 As shown, the diffusion plate multilayer co-extrusion equipment includes:

[0035] A co-extrusion die 10, wherein the upper end surface of the co-extrusion die 10 is provided with a first feed port 101, a second feed port 102 and a third feed port 103, and the lower end surface of the co-extrusion die 10 is provided with a discharge port 104, wherein the first feed port 101, the second feed port 102 and the third feed port 103 are connected to the discharge port 104;

[0036] A first distributor 11, wherein the first distributor 11 is installed on the first feed port 101, and three feeding mechanisms 14 are connected to the first distributor 11, and the first distributor 11 has at least three distribution channels;

[0037] A second distributor 12, wherein the second distributor 12 is installed on the second feed port 102, a feeding mechanism 14 is connected to the second distributor 12, and the second distributor 12 has at least one distribution channel;

[0038] The third distributor 13 is installed on the third feed port 103 . The third distributor 13 is connected with a feeding mechanism 14 . The second distributor 12 has at least one distribution channel.

[0039] Specifically, three or four distribution channels are provided in the first distributor 11. One or two distribution channels may be provided in the second distributor 12. One, two, three or four distribution channels may be provided in the third distributor 13. In the production process, distributors with different numbers of distribution channels may be selected according to different structural layers of the product.

[0040] The present invention sets up multiple distributors, and adds the mixed raw materials into the screw extrusion equipment respectively for heating to form a molten state, and enters the corresponding distributor to form a preliminary layer structure. The preliminary formed layer structure enters the co-extrusion die 10 to realize co-extrusion to form a multi-layer composite structure. The process is simple and the cost is low, and rapid and large-scale mass production can be achieved, and it can be used to achieve efficient industrial production.

[0041] In one embodiment of the present invention, the first distributor 11 is provided with a first outlet 115, a first distribution feed port, a second distribution feed port and a third distribution feed port, the first distribution feed port is connected to two first distribution channels 111, the second distribution inlet is connected to the second distribution channel 112, the third distribution inlet is connected to the third distribution channel 113, and the first distribution channel 111, the second distribution channel 112 and the third distribution channel 113 are connected to the first outlet 115. Specifically, three feeding mechanisms 14 convey three different materials into the first distributor 11, and the materials flow through the three distribution feed ports and the four distribution channels to form a preliminary layer structure of a four-layer structure in the first distributor 11.

[0042] In one embodiment of the present invention, two first distribution channels 111 are arranged on both sides of the second distribution channel 112, and the two first distribution channels 111 and the second distribution channel 112 merge into a distribution branch channel 114, and the distribution branch channel 114 merges with the third distribution channel 113 and then connects to the first outlet 115. Specifically, the material of the diaphragm layer enters the second distribution channel 112 from the second distribution feed port, the material of the glue bonding layer enters the two first distribution channels 111 from the first distribution feed port, and the outer substrate enters the third distribution channel 113 from the third distribution feed port. The two sides of the diaphragm layer are glued to form a first core plate, and the first core plate and the diaphragm layer form a second core plate and then enter the first feed port 101 of the co-extrusion die 10.

[0043] In one embodiment of the present invention, the third distributor 13 has the same structure as the first distributor 11, and three loading mechanisms 14 are connected to the third distributor 13. That is, the third distributor 13 is provided with a first outlet 115, a first distribution feed port, a second distribution feed port, and a third distribution feed port, the first distribution feed port is connected to two first distribution channels 111, the second distribution inlet is connected to the second distribution channel 112, the third distribution inlet is connected to the third distribution channel 113, and the first distribution channel 111, the second distribution channel 112, and the third distribution channel 113 are connected to the first outlet 115. Specifically, the three loading mechanisms 14 transport three different materials into the third distributor 13, and the materials flow through the three distribution feed ports and the four distribution channels to form a preliminary layer structure of a 4-layer structure in the third distributor 13. The two first distribution channels 111 of the third distributor 13 are arranged on both sides of the second distribution channel 112, and the two first distribution channels 111 and the second distribution channel 112 merge into a distribution branch channel 114, and the distribution branch channel 114 is connected to the first outlet 115 after merging with the third distribution channel 113. Specifically, the material of the diaphragm layer enters the second distribution channel 112 from the second distribution feed port of the third distributor 13, the material of the glue bonding layer enters the two first distribution channels 111 from the first distribution feed port, and the outer layer substrate enters the third distribution channel 113 from the third distribution feed port. The two sides of the diaphragm layer are glued to form a fifth core plate, and the fifth core plate and the diaphragm layer form a fourth core plate and then enter the third feed port 103 of the co-extrusion die 10.

[0044] In one embodiment of the present invention, the co-extrusion die 10 includes a middle module 105, and a first module 106 and a second module 107 are respectively arranged on both sides of the middle module 105. After the first module 106 is fixed on the middle module 105, a first channel 1010 is formed between the first module 106 and the middle module 105. After the second module 107 is fixed on the middle module 105, a third channel 1030 is formed between the second module 107 and the middle module 105. A fourth channel 1040 connected to the discharge port 104 is formed between the first module 106 and the second module 107. The middle module 105 is provided with a second channel 1020 connected to the second feed port 102, and the fourth channel 1040 is respectively connected to the first channel 1010, the second channel 1020 and the third channel 1030.

[0045] The core plates formed by the three distributors are respectively the first feed port 101, the second feed port 102 and the third feed port 103, and after flowing through the first channel 1010, the second channel 1020 and the third channel 1030, the core plates of the three distributors are co-extruded in the fourth channel 1040 to form a multi-layer composite structure.

[0046] The first module 106 and the second module 107 are respectively fixed to the middle module 105 by bolts, so as to facilitate replacement of the first module 106 and the second module 107 of different product models and to facilitate replacement of the worn first module 106 or the second module 107 .

[0047] In one embodiment of the present invention, the inner diameter of the fourth channel 1040 gradually decreases toward the discharge port 104, and the core plates from each distributor are co-extruded into a diffusion plate structure of a desired thickness. The inner wall of the fourth channel 1040 is provided with a groove, and the groove is close to the confluence of the first channel 1010, the second channel 1020 and the third channel 1030. Figure 4 shown.

[0048] In one embodiment of the present invention, each of the feeding mechanisms 14 includes a screw extruder, a single-plate double-station circular screen changer, a metering pump, and a connector, which are arranged in sequence, and the connector is connected to the corresponding distributor. A pressure sensor and a filter are arranged on the single-plate double-station circular screen changer, the pressure sensor is used to detect the pressure of the internal material, and the filter is used to filter the raw material to prevent the raw material with too large particles from entering the co-extrusion process to improve the quality of the product. The metering pump is used to record the feed amount of the raw material.

[0049] In one embodiment of the present invention, a traction mechanism is provided below the coextrusion die head 10, and the traction mechanism includes at least one traction roller 20 and a traction motor 21 for driving the traction roller 20 to rotate. Specifically, the traction mechanism is provided with three traction rollers 20, each of which is allocated with a traction motor 21, and the traction speed of the corresponding traction roller 20 can be individually controlled by the traction motor 21 to improve applicability.

[0050] In one embodiment of the present invention, the first feed port 101, the second feed port 102 and the third feed port 103 are arranged at intervals along the width direction of the co-extrusion die 10, and the discharge port 104 is arranged along the length direction of the co-extrusion die. Specifically, the first feed port 101, the second feed port 102 and the third feed port 103 are arranged at the middle position of the upper end of the co-extrusion die, and the corresponding materials flow to both sides after entering the channel of the co-extrusion die 10 to form a diffusion plate of the required thickness.

[0051] The present invention also provides a production method for multi-layer co-extrusion of a diffusion plate, using the aforementioned multi-layer co-extrusion equipment for the diffusion plate, comprising the following steps: at least two materials enter a first distributor 11, a first surface layer and a first core plate with at least two layers of structure are formed in the first distributor 11, the first core plate and the first core plate form a second core plate and then enter the co-extrusion die 10; the second core plate is extruded in the co-extrusion die 10 together with a third core plate from a second distributor 12 and a fourth core plate from a third distributor 13 to form a composite structure with at least 5 layers of structure

[0052] Take a 10-layer diffuser as an example. The structure of the diffuser from top to bottom is an outer layer, a glue bonding layer, a barrier layer, a glue bonding layer, a red QD layer, a green QD layer, a glue bonding layer, a barrier layer, a glue bonding layer and an outer layer. Correspondingly, the first distributor 11 is provided with four distribution channels, the second distributor 12 is provided with two distribution channels, and the third distributor 13 is provided with four distribution channels.

[0053] The material of the diaphragm layer enters the second distribution channel 112 from the second distribution feed port of the first distributor 11, the material of the glue bonding layer enters the two first distribution channels 111 from the first distribution feed port, and the outer layer substrate enters the third distribution channel 113 from the third distribution feed port. The two sides of the diaphragm layer are glued to form a first core plate. After the first core plate and the diaphragm layer form a second core plate, they enter the first feed port 101 of the co-extrusion die 10.

[0054] The red QD and the green QD enter the two distribution channels from the feed port of the second distributor 12 respectively, forming a third core plate with a two-layer structure in the second distributor 12 , and the third core plate enters the second feed port 102 of the co-extrusion die 10 .

[0055] The material of the diaphragm layer enters the second distribution channel 112 from the second distribution feed port of the third distributor 13, the material of the glue bonding layer enters the two first distribution channels 111 from the first distribution feed port, and the outer layer substrate enters the third distribution channel 113 from the third distribution feed port. The two sides of the diaphragm layer are glued to form a fifth core plate. After the fifth core plate and the diaphragm layer form a fourth core plate, they enter the third feed port 103 of the co-extrusion die 10.

[0056] The second core board, the third core board and the fourth core board are co-extruded in the co-extrusion die head 10 to form a desired 10-layer composite structure.

[0057] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A production method for multi-layer co-extrusion of a diffusion plate, using a multi-layer co-extrusion device for a diffusion plate, the multi-layer co-extrusion device for a diffusion plate includes: A co-extrusion die (10), wherein the upper end surface of the co-extrusion die (10) is provided with a first feed port (101), a second feed port (102) and a third feed port (103), and the lower end surface of the co-extrusion die (10) is provided with a discharge port (104), and the first feed port (101), the second feed port (102) and the third feed port (103) are connected to the discharge port (104); A first distributor (11), the first distributor (11) being installed on the first feed port (101), the first distributor (11) being connected to three feeding mechanisms (14), and the first distributor (11) having four distribution channels; A second distributor (12), the second distributor (12) being mounted on the second feed port (102), the second distributor (12) being connected to a feeding mechanism (14), and the second distributor (12) having two distribution channels; A third distributor (13), the third distributor (13) is mounted on the third feed port (103), the third distributor (13) is connected to a feeding mechanism (14), and the third distributor (13) has four distribution channels; The first distributor (11) is provided with a first outlet (115), a first distribution feed port, a second distribution feed port and a third distribution feed port, the first distribution feed port is connected to two first distribution channels (111), the second distribution feed port is connected to a second distribution channel (112), the third distribution feed port is connected to a third distribution channel (113), and the first distribution channel (111), the second distribution channel (112) and the third distribution channel (113) are connected to the first outlet (115); Two first distribution channels (111) are arranged on both sides of the second distribution channel (112); the two first distribution channels (111) and the second distribution channel (112) merge into a distribution branch channel (114); the distribution branch channel (114) merges with the third distribution channel (113) and is connected to a first outlet (115); The third distributor (13) has the same structure as the first distributor (11); The co-extrusion die head (10) comprises a middle module (105), wherein a first module (106) and a second module (107) are respectively arranged on both sides of the middle module (105); after the first module (106) is fixed on the middle module (105), a first channel (1010) is formed between the first module (106) and the middle module (105); after the second module (107) is fixed on the middle module (105), a third channel (1030) is formed between the second module (107) and the middle module (105); a fourth channel (1040) connected to the discharge port (104) is formed between the first module (106) and the second module (107); a second channel (1020 connected to the second feed port (102) is arranged on the middle module (105); and the fourth channel (1040) is respectively connected to the first channel (1010), the second channel (1020) and the third channel (1030); The first module (106) and the second module (107) are respectively fixed to the middle module (105) by bolts; The inner diameter of the fourth channel (1040) gradually decreases toward the discharge port (104), and the core plates from each distributor are co-extruded into a diffusion plate structure of a desired thickness; the inner wall of the fourth channel (1040) is provided with a groove, and the groove is close to the confluence of the first channel (1010), the second channel (1020) and the third channel (1030); Each of the feeding mechanisms (14) includes a screw extruder, a single-plate double-station circular screen changer, a metering pump and a connector, which are arranged in sequence, and the connector is connected to the corresponding distributor; The method includes: The material of the diaphragm layer enters the second distribution channel (112) from the second distribution feed port of the first distributor (11), the material of the glue bonding layer enters the two first distribution channels (111) from the first distribution feed port, and the outer layer substrate enters the third distribution channel (113) from the third distribution feed port. The two sides of the diaphragm layer and the glue bonding layer respectively form a first core plate, and the first core plate and the outer layer substrate form a second core plate and then enter the first feed port (101) of the co-extrusion die head (10); The red QD and the green QD enter the two distribution channels from the feed port of the second distributor (12) respectively, forming a third core plate with a two-layer structure in the second distributor (12), and the third core plate enters the second feed port (102) of the co-extrusion die head (10); The material of the diaphragm layer enters the second distribution channel (112) from the second distribution feed port of the third distributor (13), the material of the glue bonding layer enters the two first distribution channels (111) from the first distribution feed port, the outer layer substrate enters the third distribution channel (113) from the third distribution feed port, the two sides of the diaphragm layer and the glue bonding layer respectively form a fifth core plate, and the fifth core plate and the outer layer substrate form a fourth core plate and then enter the third feed port (103) of the co-extrusion die head (10); The second core plate, the third core plate and the fourth core plate are co-extruded in a co-extrusion die head (10) to form a composite structure with the required 10-layer structure.

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