Film extrusion coating nozzle device

Abstract

The application relates to a film extrusion coating nozzle device, which comprises an upper nozzle and a lower nozzle connected in an openable and closable mode, the upper end surface of the lower nozzle is provided with a material cavity, one side of the lower nozzle is provided with a feeding pipeline communicated with the material cavity, the pipeline inlet is arranged on the outer side of the lower nozzle, the pipeline outlet is arranged on the inner side of the material cavity, the pipeline outlet is a variable-diameter material port, the side far from the material cavity is an inner-diameter port, the side close to the material cavity is an outer-diameter port, the size of the pipeline outlet gradually increases from the inner-diameter port to the outer-diameter port, and the increasing amount of the diameter of the middle part of the pipeline outlet is greater than that of the upper and lower sides of the pipeline outlet. By arranging the variable-diameter material port, the high-viscosity glue can flow into the material cavity uniformly and stably, the pipeline outlet part is prevented from being blocked or the glue from mainly accumulating in front of the pipeline outlet, the liquid surface in the material cavity is prevented from being uneven, the film produced by the device is prevented from having concave-convex points, uneven thickness and other adverse effects, and the yield of the mobile phone supporting film is reasonably and effectively improved.

Description

Technical Field

[0001] This application relates to the field of mobile phone component manufacturing and processing technology, and in particular to a film extrusion coating nozzle device. Background Technology

[0002] With the advancement of science and technology, the mobile phone industry is accelerating its development towards thinner and lighter designs. As a result, the demand for internal support films in mobile phones is growing rapidly, and the requirements for support films are becoming increasingly stringent, especially the uniformity and flatness of the surface adhesive layer.

[0003] Since the adhesives used to manufacture the support film are all organic polymer materials, these adhesives have characteristics such as high viscosity and large thickness. After the adhesive enters the cavity of the film extrusion coating nozzle device from the pipeline inlet, the viscous adhesive is prone to accumulate at the pipeline outlet, resulting in an uneven liquid surface in the cavity. As a result, the mobile phone support films produced on this basis generally have problems such as bumps on the film surface and inconsistent thickness, which brings great difficulties to the coating and preparation of mobile phone support films. Summary of the Invention

[0004] In view of this, this application proposes a film extrusion coating nozzle device, including an upper nozzle and a lower nozzle that can be opened and closed; the lower end face of the upper nozzle is a flat surface and fits against the lower nozzle; a pipeline inlet is pre-opened on one side of the lower nozzle, and a material cavity is pre-opened on the upper end face of the lower nozzle, with a pipeline outlet opened on the inner side wall of the material cavity and connected to the pipeline inlet; the pipeline outlet is a variable diameter material outlet, the size of the pipeline outlet gradually increases from the inner diameter to the outer diameter, and the diameter increase in the middle of the pipeline outlet is greater than the diameter increase on the upper and lower sides of the pipeline outlet.

[0005] In one possible implementation, the projection of the outer diameter orifice in the feed-to-discharge direction is "lip-shaped", and the lower radius of the outer diameter orifice is greater than the upper radius of the outer diameter orifice.

[0006] In one possible implementation, the pipe inlet and the pipe outlet are horizontally connected; the radius of the inner diameter port is within [15mm, 25mm], and the radius of the inner diameter port is the same as that of the pipe inlet; the cross-sectional radius of the outer diameter port relative to the inner diameter port is within [3mm-5mm].

[0007] In one possible implementation, the ratio of the diameter of the inner diameter opening to the depth of the material cavity is greater than 3:5; the bottom of the outer diameter opening is located near the lowest point of the material cavity.

[0008] In one possible implementation, the upper nozzle has a cuboid structure, the lower nozzle has a cuboid structure, and the upper nozzle and the lower nozzle are matched and installed; the upper nozzle and the lower nozzle are hinged on one side along their length; the material cavity is an elongated groove, the feeding to discharging direction is in the same direction as the opening and closing direction of the upper nozzle and the lower nozzle, and the pipeline outlet is located at the midpoint of the length direction of the material cavity.

[0009] In one possible implementation, the sidewall of the material cavity on the side where the pipeline outlet is located has a concave arc surface structure, and the sidewall on the side away from the pipeline outlet has an inclined straight surface structure that is smoothly connected to the concave arc surface.

[0010] In one possible implementation, the angle between the inclined straight surface structure and the horizontal plane is in the range of [30°, 45°].

[0011] In one possible implementation, the top of the upper nozzle is further provided with two or more opening screws, and the opening screws are evenly distributed along the length of the upper nozzle to facilitate opening the upper nozzle.

[0012] In one possible implementation, the upper nozzle has a right-angled trapezoidal cross-section in the feeding to discharging direction, and the lower nozzle has an inverted right-angled trapezoidal cross-section in the feeding to discharging direction. The hinge between the upper nozzle and the lower nozzle is located on one side of the right angle, and the pipeline inlet is located on the same side as the hinge. The inclined surfaces of the upper nozzle and the lower nozzle are perpendicular to each other after being fitted together. The upper nozzle has a first group of holes evenly distributed along its length and vertically penetrating the upper nozzle from top to bottom. The lower nozzle has a second group of holes evenly distributed along its length, matching the first group of holes, and the second group of holes has two or more rows. The second group of holes is staggered in the feeding to discharging direction.

[0013] In one possible implementation, the pipeline inlet extends outward from the rear end of the lower nozzle, and the material cavity is not attached to the edge of the lower nozzle; it also includes a protective cover, which can be fixed on the front end slope of the upper nozzle when the upper nozzle and the lower nozzle are attached, to cover the front ends of the upper nozzle and the lower nozzle.

[0014] The beneficial effects of this application are as follows: By opening a pipe inlet on one side of the lower nozzle and connecting it to a material cavity on the upper end face of the lower nozzle, the connecting opening is a variable diameter inlet that gradually increases in diameter from the inlet to the outlet. This variable diameter inlet facilitates the flow of high-viscosity adhesive into the material cavity, ensuring a uniform and stable flow. It effectively avoids blockage at the pipe outlet or adhesive accumulation in front of the outlet, and situations where the liquid level on both sides of the material cavity is lower than the middle level, hindering adhesive flow. This solves the problem of uneven liquid levels in the material cavity, which leads to unevenness and irregular thickness in the films produced by this equipment, thus reasonably and effectively improving the yield of mobile phone support films. Furthermore, the horizontal width of the variable diameter inlet in the middle is greater than the horizontal width at the top and bottom, and the increase in diameter at the middle of the pipe outlet is greater than the increase in diameter at the top and bottom of the outlet. In other words, the variable diameter inlet has a "lip-shaped" structure, with the lower radius of the outer diameter being greater than the upper radius, further improving the efficiency of adhesive flow into the material cavity.

[0015] Other features and aspects of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0016] The accompanying drawings, which are included in and form part of this specification, illustrate exemplary embodiments, features, and aspects of this application together with the specification and serve to explain the principles of this application.

[0017] Figure 1 A top perspective view of a mobile phone support film extrusion coating nozzle apparatus according to an embodiment of this application is shown;

[0018] Figure 2 This application shows a side perspective view of the lower nozzle according to an embodiment of the present application;

[0019] Figure 3 A perspective view of a mobile phone support film extrusion coating nozzle device according to an embodiment of this application is shown;

[0020] Figure 4 A side view of the upper jaw according to another embodiment of this application is shown. Detailed Implementation

[0021] Various exemplary embodiments, features, and aspects of this application will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0022] It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application or to simplify the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0024] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments.

[0025] Furthermore, to better illustrate this application, numerous specific details are provided in the following detailed embodiments. Those skilled in the art should understand that this application can be implemented without certain specific details. In some instances, methods, means, components, and circuits well-known to those skilled in the art have not been described in detail in order to highlight the main points of this application.

[0026] Figure 1 A top perspective view of a mobile phone support film extrusion coating nozzle apparatus according to an embodiment of this application is shown; Figure 2 This application shows a side perspective view of the lower nozzle according to an embodiment of the present application; Figure 3 A perspective view of a mobile phone support film extrusion coating nozzle device according to an embodiment of this application is shown; Figure 4 A side view of the upper jaw according to another embodiment of this application is shown.

[0027] like Figures 1-4As shown, the film extrusion coating nozzle device includes an upper nozzle 10 and a lower nozzle 20 that can be opened and closed. The lower end face of the upper nozzle 10 is a flat surface that fits against the lower nozzle 20. A pipeline inlet 50 is pre-opened on one side of the lower nozzle 20, and a material cavity 40 is pre-opened on the upper end face of the lower nozzle 20. A pipeline outlet 30 is opened on the inner side wall of the material cavity 40 and is connected to the pipeline inlet 50. The pipeline outlet 30 is a variable diameter material outlet. The size of the pipeline outlet 30 gradually increases from the inner diameter 31 to the outer diameter 32. The horizontal width of the middle part of the pipeline outlet 30 is greater than the horizontal width of the upper and lower ends. The diameter increase in the middle part of the pipeline outlet 30 is greater than the diameter increase on the upper and lower sides of the pipeline outlet 30.

[0028] In this embodiment, a pipe inlet 50 is opened on one side of the lower nozzle 20 and connected to a material cavity 40 opened on the upper end face of the lower nozzle 20. The connection port is a variable diameter material port that gradually increases in diameter from the inlet to the outlet. The variable diameter material port is beneficial for the high viscosity glue to flow into the material cavity 40. The glue can flow into the material cavity 40 stably, effectively avoiding partial blockage of the pipe outlet 30 or glue mainly accumulating in front of the pipe outlet 30, and the liquid level on both sides of the material cavity 40 being lower than the middle height, which are not conducive to glue flow. Furthermore, the increase in diameter at the middle of the pipe outlet 30 is greater than the increase in diameter at the top and bottom of the pipe outlet 30. In other words, the variable diameter material outlet has a "lip-shaped" structure. The change in diameter at the middle of the pipe outlet 30 is greater than the change in diameter at the sides. The larger change in diameter at the middle is conducive to more uniform flow into the material chamber 40, thereby solving the problem of uneven liquid surface in the material chamber 40, which causes unevenness and uneven thickness of the membranes produced by this equipment. This reasonably and effectively improves the yield of mobile phone support films.

[0029] In one specific embodiment, the projection of the outer diameter opening 32 in the feeding to discharging direction is "lip-shaped", and the lower part of the outer diameter opening 32 has a larger radius than the upper part of the outer diameter opening 32.

[0030] In this embodiment, the lower radius of the outer diameter opening 32 is greater than the upper radius of the outer diameter opening 32, thereby improving the efficiency of glue flowing into the material cavity 40.

[0031] like Figure 1 , Figure 2 As shown, in one specific embodiment, the pipe inlet 50 and the pipe outlet 30 are horizontally connected, the radius of the inner diameter port 31 is within [15mm, 25mm], the inner diameter port 31 has the same radius as the pipe inlet 50, and the variable cross-sectional radius of the outer diameter port 32 relative to the inner diameter port 31 is within [3mm-5mm].

[0032] In the above embodiments, preferably, the variable cross-sectional radius of the pipe outlet 30 is between 3 and 5 mm, that is, the radius difference between the projection of the outer diameter port 32 in the horizontal direction and the projection of the inner diameter port 31 in the horizontal direction is within the range of 3 mm to 5 mm. The variable diameter port within this range can better adapt to the viscosity, rheology, shear rate, surface tension and other characteristics of the mobile phone support film adhesive, and can smoothly and stably distribute the adhesive coming in from the pipe inlet 50 into the flow equalization cavity.

[0033] In one specific embodiment, the ratio of the diameter h of the inner diameter port 31 to the depth H of the material cavity 40 is greater than 3:5, and the bottom of the outer diameter port 32 is close to the lowest position of the material cavity 40.

[0034] In one specific embodiment, the upper nozzle 10 has a cuboid structure, the lower nozzle 20 has a cuboid structure, and the upper nozzle 10 and the lower nozzle 20 are matched and installed. The upper nozzle 10 and the lower nozzle 20 are hinged on one side along their length direction. The material cavity 40 is a long strip groove. The feeding and discharging direction is set in the same direction as the opening and closing direction of the upper nozzle 10 and the lower nozzle 20. The pipeline outlet 30 is opened at the midpoint of the length direction of the material cavity 40.

[0035] In one specific embodiment, the sidewall of the material cavity 40 with the pipe outlet 30 on the side is a concave arc surface structure, and the sidewall away from the pipe outlet 30 is an inclined straight surface structure that is smoothly connected to the concave arc surface.

[0036] In this embodiment, the sidewall of the material cavity 40 with the pipe outlet 30 has a concave arc surface structure, while the sidewall facing away from the pipe outlet 30 has an inclined straight surface structure that smoothly connects to the concave arc surface. That is, the longitudinal cross-sectional shape of the material cavity 40 is a horizontally placed semi-teardrop shape. The radius of the concave arc structure is within the range of 15-30 mm, designed according to the adhesive thickness, humidity, coating amount, and other process parameters in the production of the support film. Its main purpose is to evenly distribute the adhesive flow from the distribution port under a certain feeding pressure, ensuring a uniform adhesive flow from the pipe outlet 30, thus guaranteeing uniform coating thickness and a smooth surface free of bumps, streaks, or other defects. It should also be noted that the inner wall surface of the material cavity 40 has a mirror-like finish.

[0037] In one specific embodiment, the angle between the inclined straight structure and the horizontal plane is in the range of [30°, 45°].

[0038] In this embodiment, the upper nozzle 10 and the lower nozzle 20 are matched and symmetrically arranged, and the inclined surfaces of the upper nozzle 10 and the lower nozzle 20 are at the same angle to the horizontal plane, so as to ensure that the force is evenly distributed when preparing the mobile phone support film.

[0039] In one specific embodiment, the top of the upper nozzle 10 is also provided with two or more opening screws 60, and the opening screws 60 are evenly distributed in the length direction of the upper nozzle 10 to facilitate opening the upper nozzle 10.

[0040] In this embodiment, the opening screw 60 of the upper nozzle 10 is mainly used after a long coating operation. Due to the viscosity of the adhesive, the upper and lower nozzles 20 are difficult to open. At this time, it is only necessary to tighten the opening screw 60 to open it slowly.

[0041] In one specific embodiment, the upper nozzle 10 has a right-angled trapezoidal cross-section in the feeding to discharging direction, and the lower nozzle 20 has an inverted right-angled trapezoidal cross-section in the feeding to discharging direction. The hinge of the upper nozzle 10 and the lower nozzle 20 is located on one side of the right angle. The long base of the upper nozzle 10 is in contact with the long base of the lower nozzle 20. The inclined surfaces of the upper nozzle 10 and the lower nozzle 20 are perpendicular to each other after being in contact. The pipeline inlet 50 is located on the same side as the hinge. The upper nozzle 10 has a first group of holes evenly distributed in the length direction and vertically penetrates the upper nozzle 10 from top to bottom. The lower nozzle 20 has a second group of holes evenly distributed in the length direction that matches the first group of holes. The number of second groups of holes is more than two rows. The second groups of holes are staggered in the feeding to discharging direction.

[0042] In this embodiment, the second set of holes offset on the lower nozzle 20 can be matched with the first set of holes, facilitating the adjustment of the position of the upper and lower nozzles 20 in the discharge direction. Preferably, the connection between the upper nozzle 10 and the lower nozzle 20 is a hinge connection, which allows for direct opening when replacing gaskets or cleaning, without needing to lift the upper and lower nozzles 20, making it safe and quick.

[0043] like Figure 3 As shown, in one specific embodiment, it also includes a discharge gap adjusting shim and a misalignment adjusting shim 90. The discharge gap adjusting shim is mainly used according to the different thicknesses of the target product; for products of different thicknesses, only the shim needs to be replaced. The misalignment adjusting shim 90 is mainly used to adjust the appearance of unevenness and thickness uniformity of the coated adhesive, and is easy to operate. The top of the upper nozzle 10 is also provided with two or more lifting rings 70.

[0044] In one specific embodiment, the pipeline inlet 50 extends outward from the rear end of the lower nozzle 20, the material cavity 40 is not attached to the edge of the lower nozzle 20, and a nozzle protection cover 80 is also included. When the upper nozzle 10 and the lower nozzle 20 are attached, the side of the upper nozzle 10 and the lower nozzle 20 that is away from the openable side is the nozzle. The nozzle protection cover 80 can be fixed on the front end slope of the upper nozzle 10 to cover the front end of the upper nozzle 10 and the lower nozzle 20.

[0045] like Figure 4As shown in this embodiment, for ease of description, the nozzle side is positioned at the front end, and the pipeline inlet 50 is located at the rear end of the lower nozzle 20. The nozzle protective cover 80 mainly protects the nozzle from damage when it is not in operation. More specifically, the front end of the inclined surface of the upper nozzle 10 of the trapezoidal body also has a bent surface. The bent surface is usually a bent straight surface, and the angle α between the bent surface and the horizontal plane is smaller than the angle β between the inclined surface and the horizontal plane. The lower nozzle 20 of the inverted trapezoidal body has the same structure as the upper nozzle 10, and they can be opened and closed when reversed.

[0046] Preferably, the angle α between the bent surface and the horizontal plane is 45°, and the angle β between the inclined surface and the horizontal plane is 60°.

[0047] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A film extrusion coating nozzle device, characterized in that, Includes an openable and closable upper and lower nozzle; The lower end face of the upper nozzle is a flat surface, which fits in close contact with the lower nozzle; The upper end face of the lower nozzle is provided with a material cavity, and a feeding pipe communicating with the material cavity is provided on one side of the lower nozzle. The inlet of the pipe is located on the outside of the lower nozzle, and the outlet of the pipe is located on the inside of the material cavity. The pipeline outlet is a variable diameter inlet, with the inner diameter inlet on the side away from the material cavity and the outer diameter inlet on the side closer to the material cavity. The size of the pipeline outlet gradually increases from the inner diameter inlet to the outer diameter inlet, and the increase in diameter in the middle of the pipeline outlet is greater than the increase in diameter on the upper and lower sides of the pipeline outlet; the variable diameter inlet is similar to a "lip-shaped" structure. The lower radius of the outer diameter opening is greater than the upper radius of the outer diameter opening; The sidewall of the material cavity with the outlet of the pipeline has a concave arc surface structure, and the sidewall facing away from the outlet of the pipeline has an inclined straight surface structure that is smoothly connected to the concave arc surface; the longitudinal cross-section of the material cavity is a horizontally placed semi-tear shape. The bottom of the outer diameter opening is located near the lowest point of the material cavity.

2. The film extrusion coating nozzle device according to claim 1, characterized in that, The radius of the inner diameter opening is within [15mm, 25mm], and the radius of the inner diameter opening is the same as that of the pipe inlet; The variable cross-sectional radius of the outer diameter relative to the inner diameter is within the range of 3mm-5mm.

3. The film extrusion coating nozzle device according to claim 1, characterized in that, The ratio of the diameter of the inner diameter opening to the depth of the material cavity is greater than 3:

5.

4. The film extrusion coating nozzle device according to claim 1, characterized in that, The upper nozzle has a cuboid structure, the lower nozzle has a cuboid structure, and the upper nozzle and the lower nozzle are matched and installed. The upper nozzle and the lower nozzle are hinged together on one side along their length. The material chamber is a long strip-shaped channel. The feeding and discharging direction is in the same direction as the opening and closing direction of the upper nozzle and the lower nozzle, and the pipeline outlet is located at the midpoint of the length direction of the material chamber.

5. The film extrusion coating nozzle apparatus according to claim 4, characterized in that, The angle between the inclined straight surface structure and the horizontal plane is in the range of [30°, 45°].

6. The film extrusion coating nozzle apparatus according to claim 1, characterized in that, The top of the upper nozzle is also provided with two or more opening screws, and the opening screws are evenly distributed along the length of the upper nozzle to facilitate opening the upper nozzle. The top of the upper nozzle is also equipped with two or more lifting rings.

7. The film extrusion coating nozzle apparatus according to claim 3, characterized in that, The upper nozzle has a right-angled trapezoidal cross-section in the feeding to discharging direction, and the lower nozzle has an inverted right-angled trapezoidal cross-section in the feeding to discharging direction. The long base of the upper nozzle and the long base of the lower nozzle are in contact. The hinge between the upper nozzle and the lower nozzle is located on the right-angle side, and the pipeline inlet is located on the same side as the hinge. The inclined surface of the upper nozzle and the inclined surface of the lower nozzle are perpendicular to each other after they are fitted together. The upper nozzle is provided with a first group of holes evenly distributed along its length, and vertically penetrates the upper nozzle from top to bottom. The lower nozzle is provided with a second set of holes that matches the first set of holes evenly distributed along its length, for fixing the upper nozzle and the lower nozzle. The second set of holes has two or more rows and is staggered in the feeding to discharging direction.

8. The film extrusion coating nozzle apparatus according to claim 1, characterized in that, The pipeline inlet extends outward from the rear end of the lower nozzle, and the material chamber is not attached to the edge of the lower nozzle; It also includes a protective cover, which can be fixed on the front end slope of the upper nozzle when the upper nozzle and the lower nozzle are attached, so as to cover the front end of the upper nozzle and the lower nozzle.

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