Casting hanger type co-extrusion die head for color gradient decorative film
By using a coat hanger-style co-extrusion die head design, the problems of color transition and layer thickness control in color gradient decorative films were solved, achieving continuous gradient effects and uniformity in color gradient decorative films.
Patent Information
- Application Number
- CN202520619760.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-03
- Publication Date
- 2026-03-03
- Estimated Expiration
- 2035-04-03
AI Technical Summary
Traditional parallel flow channel design makes it difficult to achieve natural color transitions and precise thickness control in colored gradient decorative films, resulting in thickness deviations and uneven color.
The co-extrusion die head is designed with a width of less than that of the die lip on one side of the feed inlet. Combined with the flow channel adjustment and throttling device, the uniform distribution and precise control of the material in the width direction of the die head can be achieved.
It achieves a continuous gradient effect in the color gradient decorative film, reduces thickness deviation and color unevenness, and improves the appearance quality and functionality of the decorative film.
Smart Images
Figure CN223961691U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of die head structure, specifically to a co-extrusion die head for color gradient decorative film casting and hanging type. Background Technology
[0002] In the production of decorative films, the casting die is the core component for film forming, and its structure and performance directly determine the appearance and functionality of the film. The main function of the casting die is to evenly distribute the molten material from the extruder across the width of the die and extrude it through the die lip. Traditional casting dies typically employ a parallel flow channel design, which can meet the production needs of ordinary films to a certain extent, but its limitations become increasingly apparent when producing decorative films with special effects.
[0003] In the production of color gradient decorative films, the films are required not only to have rich colors but also to achieve natural transitions between colors and precise control of layer thickness. However, traditional parallel flow channel dies struggle to meet these requirements. On one hand, parallel flow channels make it difficult to precisely control the layer thickness of different colored materials in the extrusion direction, resulting in each layer's thickness remaining essentially constant in the extrusion direction, leading to abrupt color transitions and an inability to achieve a continuous gradient effect. On the other hand, traditional dies lack uniformity, easily causing thickness deviations and color inconsistencies, affecting the appearance and functionality of the decorative film.
[0004] In view of the above, this application is hereby submitted. Utility Model Content
[0005] The purpose of this utility model is to provide a co-extrusion die head for color gradient decorative film using a caster hanger type. By designing the width of a single channel on the feed port side to be smaller than its width on the die lip side, uniform distribution of material in the width direction of the die head is achieved, thereby solving the problems of thickness deviation and uneven color that are prone to occur in the prior art.
[0006] This utility model embodiment is achieved through the following technical solution: This utility model embodiment provides a co-extrusion die head for color gradient decorative film, including a die head body, one end of which is provided with at least one feed port, and at least one flow channel is provided inside, each flow channel being connected to a single feed port;
[0007] The other end of the die head body is provided with a die lip, which is designed to extrude the composite material;
[0008] The die head body is also provided with a collecting channel, one end of which is connected to the branch channel and the other end is connected to the die lip.
[0009] In this case, the width of a single flow channel on the feed inlet side is smaller than its width on the die lip side.
[0010] Optionally, the width of a single flow channel gradually widens in an arc shape from the inlet side to the die lip side.
[0011] Optionally, the width of a single flow channel has a linear gradient from the inlet side to the die lip side, and gradually widens.
[0012] Optionally, a single branch channel includes a guide section and a paving section connected together, the width of the paving section being greater than the width of the guide section, the guide section being connected to a single feed inlet, and the paving section being connected to a converging channel.
[0013] Optionally, it also includes at least one regulating channel, one end of which is connected to a single branch channel and the other end of which is connected to a converging channel. The single regulating channel is provided with at least one throttling device for regulating the flow rate of the material.
[0014] Optionally, there are three feed inlets: a first feed inlet, a second feed inlet, and a third feed inlet.
[0015] There are three diversion channels: the first diversion channel, the second diversion channel, and the third diversion channel.
[0016] There are three regulating channels: the first regulating channel, the second regulating channel, and the third regulating channel.
[0017] One end of the first branch channel is connected to the first feed inlet, and the other end is connected to the first regulating channel;
[0018] One end of the second branch channel is connected to the second feed inlet, and the other end is connected to the second regulating channel;
[0019] One end of the third branch channel is connected to the third feed inlet, and the other end is connected to the third regulating channel.
[0020] Optionally, two throttling devices are provided at intervals on a single regulating flow channel.
[0021] Optionally, the height of a single feed inlet is greater than the height of a single branch channel connected to it.
[0022] Optionally, the height of a single regulating channel is less than the height of a single branch channel connected to it.
[0023] Optionally, the width of a single regulating channel is equal to the width of a single branch channel connected to it, and the height of the extrusion orifice of the die lip is less than the height of the converging channel.
[0024] Compared with the prior art, the embodiments of this utility model have the following advantages and beneficial effects:
[0025] 1. The co-extrusion die head of the present invention, which is a coat hanger type, allows PC / PMMA materials of different colors to enter the die head through the feed inlet and enter their respective independent distribution channels. In the distribution channels, the materials are gradually and evenly distributed across the width of the die head through channels that resemble coat hangers. The width of the distribution channels gradually widens from the feed inlet side to the die lip side, which helps to reduce melt resistance and ensures uniform distribution of materials across the width of the die head. After being evenly distributed through the distribution channels, the materials enter the collection channel, where the layers of materials are tightly bonded together to form a composite layer. The composite material is then extruded through the die lip to form a decorative film with a continuous gradient color effect.
[0026] In this embodiment of the utility model, the caster hanger type co-extrusion die head achieves uniform distribution and precise control of materials in the width direction of the die head by optimizing the setting of the branch channel and the converging channel. The hanger shape design of the branch channel reduces melt resistance, improves the uniformity of material distribution, reduces thickness deviation and color unevenness, and improves the appearance quality and functionality of the decorative film.
[0027] 2. This embodiment of the invention, by setting an adjustable flow channel, can further precisely control the flow rate and thickness of each layer of material to achieve a color gradient effect. The adjustable flow channel allows the die head to adjust the flow rate of materials of different colors individually, thereby achieving precise control of layer thickness.
[0028] In general, the gradient decorative film casting hanger type co-extrusion die head provided by the embodiments of this utility model achieves uniform distribution of material in the width direction of the die head by designing the width of a single flow channel on the feed port side to be smaller than its width on the die lip side, thereby improving the control accuracy and uniformity of the decorative film. Attached Figure Description
[0029] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0030] Figure 1 A schematic diagram of the co-extrusion die head structure for the caster hanger type provided in this embodiment of the utility model;
[0031] Figure 2 A top view of the flow channel provided in an embodiment of the present utility model, wherein Figure 2 a is a diagram of an arc-shaped gradient structure. Figure 2 b is a linear gradient structure diagram;
[0032] Figure 3 A top view of the diversion channel combining the guide section and the paving section provided in an embodiment of this utility model;
[0033] Figure 4 A schematic diagram of the connection structure of the regulating flow channel provided in an embodiment of this utility model;
[0034] Figure 5 This is a schematic diagram of the cross-sectional thickness of the decorative film prepared using the mold head of this utility model embodiment.
[0035] The attached diagram shows the markings and corresponding component names:
[0036] 1-Die lip, 2-Gathering channel, 3-Guiding section, 4-Spreading section, 5-Throttling device, 6-First feed inlet, 7-Second feed inlet, 8-Third feed inlet, 9-First branch channel, 10-Second branch channel, 11-Third branch channel, 12-First regulating channel, 13-Second regulating channel, 14-Third regulating channel, 15-Insulation layer, A-Feeding area, B-Branching area, C-Regulating area, D-Composite area, E-Die lip area. Detailed Implementation
[0037] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.
[0038] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0039] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0040] In the description of this utility model, it should be noted that the terms "first", "second", "third", etc. are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance. Example
[0041] like Figure 1As shown, this utility model embodiment provides a co-extrusion die head for color gradient decorative film, including a die head body. One end of the die head body is provided with at least one feed port, and at least one branch channel is provided inside it, each branch channel being connected to a single feed port. The other end of the die head body is provided with a die lip 1, which is configured to extrude the composite material. A collecting channel 2 is also provided inside the die head body, one end of which is connected to the branch channel, and the other end is connected to the die lip 1. The width of a single branch channel on the feed port side is smaller than its width on the die lip 1 side.
[0042] Specifically, the feed inlet is the entrance for material into the die head and can be connected to the output end of the extruder. Each feed inlet corresponds to a flow channel for introducing PC / PMMA materials of different colors. The function of the flow channel is to evenly distribute the material entering from the feed inlet along the width of the die head. Each flow channel adopts a coat hanger-like design, with the channel width gradually widening from the feed inlet side to the die lip 1 side. This helps reduce melt resistance, ensuring uniform material distribution along the width of the die head and reducing thickness deviation and color unevenness. The die lip 1 is the outlet part of the die head, used to extrude the composite material. Preferably, the gap of the die lip 1 can be finely adjusted according to the thickness requirements of the product to ensure uniform thickness of the extruded decorative film. The function of the converging flow channel 2 is to gather the material evenly distributed by the flow channels together to form a complete composite layer.
[0043] This embodiment of the utility model achieves uniform distribution and precise control of materials in the width direction of the die head by optimizing the setting of the branch channel and the converging channel 2. The coat hanger shape design of the branch channel reduces melt resistance, improves the uniformity of material distribution, reduces thickness deviation and color unevenness, and improves the appearance quality and functionality of the decorative film.
[0044] Furthermore, it also includes at least one regulating flow channel, one end of which is connected to a single branch flow channel, and the other end of which is connected to the converging flow channel 2. Each regulating flow channel is equipped with at least one throttling device 5, which is used to regulate the flow rate of the material. The regulating flow channel can further precisely control the flow rate and thickness of each layer of material to achieve a color gradient effect. The setting of the regulating flow channel allows the die head to individually adjust the flow rate of materials of different colors, thereby achieving precise control of the layer thickness.
[0045] Specifically, one end of each regulating channel is connected to a single branch channel, and the other end is connected to the collecting channel 2, so that after the material is evenly distributed in the branch channel, it enters the regulating channel for precise adjustment of flow rate and thickness. Finally, it is compounded with other layers in the collecting channel 2. The regulating channel achieves precise control of material flow rate through the throttling device 5 set on it. By regulating the channel, the layer thickness of different colored materials can be continuously changed in the extrusion direction, thereby producing a decorative film with a continuous gradient color effect.
[0046] Each regulating channel is equipped with at least one throttling device 5. Multiple throttling devices 5 can be installed as needed to achieve finer control. By precisely controlling the opening and closing degree of the throttling device 5, the material flow rate can be precisely adjusted, thereby achieving variations in the thickness of different color layers. When it is necessary to increase the thickness of a certain layer, the opening and closing degree of the throttling device 5 on that layer's regulating channel can be decreased, increasing the material flow rate and thus increasing the layer thickness. Conversely, when it is necessary to thin a certain layer, the opening and closing degree of the throttling device 5 can be increased, slowing down the material flow rate and thus thinning the layer thickness.
[0047] It should be noted that the throttling device 5 can be any existing device for adjustment, and there are no restrictions here, as long as it can achieve the purpose of accurately adjusting the material flow rate. For example, the throttling device 5 can be an adjustable throttling valve or a throttling block.
[0048] Combination Figure 1 and Figure 4 For example, there are three feed inlets: a first feed inlet 6, a second feed inlet 7, and a third feed inlet 8; three flow dividers: a first flow divider 9, a second flow divider 10, and a third flow divider 11; and three regulating flow channels: a first regulating flow channel 12, a second regulating flow channel 13, and a third regulating flow channel 14. One end of the first flow divider 9 is connected to the first feed inlet 6, and the other end is connected to the first regulating flow channel 12. One end of the second flow divider 10 is connected to the second feed inlet 7, and the other end is connected to the second regulating flow channel 13. One end of the third flow divider 11 is connected to the third feed inlet 8, and the other end is connected to the third regulating flow channel 14.
[0049] It should be noted that in other embodiments, the number of feed inlets, branch channels, and regulating channels is not limited to three; two, one, four, five, etc., can also be provided. No limitation is imposed here, and the specific number can be set according to actual needs. Furthermore, the material in each channel is not limited. For ease of understanding, this utility model embodiment will be described with examples.
[0050] For example, returning to the embodiment of this utility model, in the feeding zone A, the first feeding port 6 is used to introduce blue PC / PMMA material, the second feeding port 7 is used to introduce green PC / PMMA material, and the third feeding port 8 is used to introduce yellow PC / PMMA material. These feeding ports are respectively connected to three extruders to ensure that materials of different colors can enter the die head independently. In the diversion zone B, one end of the first diversion channel 9 is connected to the first feeding port 6, and the other end is connected to the first regulating channel 12; one end of the second diversion channel 10 is connected to the second feeding port 7, and the other end is connected to the second regulating channel 13; one end of the third diversion channel 11 is connected to the third feeding port 8, and the other end is connected to the third regulating channel 14; each diversion channel adopts a design similar to a coat hanger, and the channel width gradually widens from the feeding port side to the die lip 1 side, which helps to reduce melt resistance and make the material evenly distributed in the width direction of the die head, preparing for subsequent layer thickness adjustment.
[0051] In the adjustment zone C, one end of the first adjustment channel 12 is connected to the first branch channel 9, and the other end is connected to the converging channel 2; one end of the second adjustment channel 13 is connected to the second branch channel 10, and the other end is connected to the converging channel 2; one end of the third adjustment channel 14 is connected to the third branch channel 11, and the other end is connected to the converging channel 2; each adjustment channel is provided with at least one throttling device 5 for adjusting the flow rate and layer thickness of the material. By precisely controlling the opening and closing degree of the throttling device 5, continuous variation of the layer thickness of different colored materials in the extrusion direction can be achieved. For example, as shown... Figure 5 As shown, the thickness of the blue layer decreases from left to right (0.5mm→0mm), the thickness of the green layer changes parabolically (0.1mm→0.5mm→0.3mm), and the thickness of the yellow layer increases from left to right (0.1mm→0.2mm).
[0052] In composite zone D, the function of the collecting channel 2 is to gather the materials from each layer after passing through the regulating channel, forming a unified composite layer. One end of the collecting channel 2 is connected to the regulating channel, and the other end is connected to the die lip 1, ensuring that the materials of each layer can be tightly bonded to form a uniform composite layer, while avoiding mixing between the layers. In die lip zone E, the die lip 1 is used to extrude the composite material. The gap of the die lip 1 can be finely adjusted according to the thickness requirements of the product to ensure that the extruded decorative film has a uniform thickness.
[0053] In a preferred embodiment of this utility model, two throttling devices 5 are spaced apart on a single regulating channel. After the material enters the regulating channel, the flow rate and layer thickness are precisely controlled by the two throttling devices 5 to achieve a complex color gradient effect. Of course, in other embodiments, only one throttling device 5 may be provided on a single regulating channel, or three or four throttling devices 5 may be provided, etc., and there is no limitation here. More preferably, the height of a single feed inlet is greater than the height of a single branch channel connected to it, the height of a single regulating channel is less than the height of a single branch channel connected to it, the width of a single regulating channel is equal to the width of a single branch channel connected to it, and the height of the extrusion orifice of the die lip 1 is less than the height of the collecting channel 2.
[0054] By setting the height of a single feed inlet greater than the height of the single branch channel it connects to, a certain pressure accumulation is formed at the feed inlet, ensuring that the material can enter the branch channel smoothly and evenly. A higher feed inlet provides a larger pressure buffer zone, making the material more stable when entering the branch channel and reducing uneven material distribution caused by pressure fluctuations. By setting the height of a single regulating channel less than the height of the single branch channel it connects to, the flow velocity of the material in the regulating channel can be further reduced, allowing the throttling device 5 to more precisely control the material flow rate and layer thickness. The shorter regulating channel increases fluid resistance, making it easier to achieve precise adjustment through the throttling device 5.
[0055] By setting the width of a single regulating channel equal to the width of the single branch channel connected to it, it can be ensured that when the material enters the regulating channel from the branch channel, there will be no additional flow rate changes or uneven distribution due to width variations. This helps maintain a uniform distribution of material throughout the channel, providing stable conditions for subsequent layer thickness adjustment. By setting the extrusion orifice height of the die lip 1 to be less than the height of the collecting channel 2, it can be ensured that the material can be extruded more uniformly at the die lip 1, reducing material accumulation or uneven thickness caused by excessive height of the die lip 1. A lower extrusion orifice height helps control the material extrusion speed, resulting in a more uniform thickness of the decorative film.
[0056] More preferably, independent temperature control devices can be provided in the first branch channel 9, the second branch channel 10, and the third branch channel 11 respectively to achieve independent temperature control of different branch channels. A heat insulation layer 15 is provided between adjacent branch channels to reduce heat transfer between adjacent branch channels.
[0057] It should be noted that the shape of a single flow channel is not limited here, as long as its width on the inlet side is less than its width on the die lip 1 side. The specific width difference can be adjusted according to actual needs and is not limited here. For example, as shown... Figure 2As shown in Figure a, the width of a single flow channel can be a structure that gradually widens in an arc shape from the inlet side to the die lip 1 side; such as Figure 2 As shown in b, the width of a single flow channel can also be a structure that gradually widens linearly from the inlet side to the die lip 1 side; such as Figure 3 As shown, a single branch channel may also include a guide section 3 and a paving section 4 connected together. The width of the paving section 4 is greater than the width of the guide section 3. The guide section 3 is connected to a single feed inlet, and the paving section 4 is connected to the converging channel 2.
[0058] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model. It should be noted that the structures or components illustrated in the accompanying drawings are not necessarily drawn to scale, and descriptions of well-known components, processing techniques, and processes are omitted to avoid unnecessarily limiting the utility model.
Claims
1. A curtain hanger type co-extrusion die for a color gradient decorative film, characterized by, The die head body is provided with at least one feeding port at one end, and at least one distribution channel is arranged in the die head body, each of which is connected with a single feeding port; The other end of the die head body is provided with a die lip (1) arranged to extrude the compounded material; The die head body is further provided with a collection channel (2) which is communicated with the distribution channel at one end and with the die lip (1) at the other end; The width of the single distribution channel at the side of the feeding port is smaller than that at the side of the die lip (1).
2. The curtain hanger type co-extrusion die head for a color gradient decoration film according to claim 1, characterized in that, The width of the single distribution channel gradually increases from the side of the feeding port to the side of the die lip (1) in an arc shape.
3. The curtain hanger type co-extrusion die head for a color gradient decoration film according to claim 1, characterized in that, The width of the single distribution channel gradually increases from the side of the feeding port to the side of the die lip (1) in a linear shape.
4. The curtain hanger type co-extrusion die head for a color gradient decoration film according to claim 1, characterized in that, The single distribution channel comprises a flow guide part (3) and a spreading part (4) which are communicated, the width of the spreading part (4) is greater than that of the flow guide part (3), the flow guide part (3) is communicated with a single feeding port, and the spreading part (4) is communicated with the collection channel (2).
5. The curtain hanger type co-extrusion die head for a color gradient decoration film according to any one of claims 1 to 4, characterized in that, Further comprising at least one adjusting channel, one end of the single adjusting channel is connected with the single distribution channel, and the other end is connected with the collection channel (2), at least one throttling device (5) is arranged on the single adjusting channel, and the throttling device (5) is used for adjusting the flow rate of the material.
6. The curtain hanger type co-extrusion die head for a color gradient decoration film according to claim 5, characterized in that, The feeding port is provided with three, which are a first feeding port (6), a second feeding port (7) and a third feeding port (8); The distribution channel is provided with three, which are a first distribution channel (9), a second distribution channel (10) and a third distribution channel (11); The adjusting channel is provided with three, which are a first adjusting channel (12), a second adjusting channel (13) and a third adjusting channel (14); One end of the first distribution channel (9) is connected with the first feeding port (6), and the other end is connected with the first adjusting channel (12); One end of the second distribution channel (10) is connected with the second feeding port (7), and the other end is connected with the second adjusting channel (13); One end of the third distribution channel (11) is connected with the third feeding port (8), and the other end is connected with the third adjusting channel (14).
7. The curtain hanger type co-extrusion die head for a color gradient decoration film according to claim 5, characterized in that, Two throttling devices (5) are arranged on the single adjusting channel.
8. The curtain hanger type co-extrusion die head for a color gradient decoration film according to claim 1, characterized in that, The height of the single feeding port is greater than that of the single distribution channel connected therewith.
9. The curtain hanger type co-extrusion die head for a color gradient decoration film according to claim 5, characterized in that, The height of the single adjusting channel is smaller than that of the single distribution channel connected therewith.
10. The curtain hanger type co-extrusion die head for a color gradient decoration film according to claim 9, characterized in that, The width of the single adjusting channel is equal to that of the single distribution channel connected therewith, and the extrusion hole height of the die lip (1) is smaller than the height of the collection channel (2).