Casting co-extrusion die head for flow line decorative film
By designing a co-extrusion die for a water-pattern decorative film, and adopting a non-circular flow channel and die lip structure, the problem of insufficient control precision of the interlayer interface of the die head was solved, realizing dynamic control of the thickness of the decorative film and the diversity of patterns, while reducing energy consumption.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-03
- Publication Date
- 2026-03-03
AI Technical Summary
When producing decorative films using existing cast film, the control precision of the interlayer interface of the die head structure is insufficient, making it difficult to achieve precise control of local thickness. Furthermore, traditional dies cannot achieve dynamic control of thickness distribution, resulting in high energy consumption and limited pattern variety.
A co-extrusion die head for decorative film with flowing water pattern is designed. It adopts an irregular flow channel and die lip structure. The irregular design of the distribution channel enables precise control of local thickness. Combined with heater and temperature sensor, dynamic regulation is achieved to avoid the need for subsequent printing or embossing processes.
It achieves dynamic control of decorative film thickness distribution, reduces energy consumption, improves the adjustability and accuracy of patterns, and avoids the need for post-processing.
Smart Images
Figure CN223961690U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of casting production of decorative films, specifically a casting co-extrusion die for a water-pattern decorative film. Background Technology
[0002] Cast film is a non-stretched, non-oriented planar extrusion film produced by melt casting and rapid cooling. Traditional cast film production of decorative films often employs single-layer or multi-layer co-extrusion technology. However, existing die structures for multi-layer co-extrusion lack sufficient precision in interlayer interface control, making precise local thickness control difficult. Furthermore, traditional die structures use a static flow channel design, which cannot achieve dynamic control of thickness distribution. To address these issues, current market-ready water-ripple decorative films primarily utilize post-printing or embossing processes, but these suffer from drawbacks such as high energy consumption and limited pattern variety.
[0003] Therefore, this patent application is filed. Utility Model Content
[0004] In view of the above, and to solve the problems existing in the prior art, this utility model provides a casting co-extrusion die for a water ripple decorative film.
[0005] The technical solution is a co-extrusion die head for a decorative film with a water-ripple pattern, characterized in that it includes a die head body, on which a feed port, a flow channel system, and a die lip are provided. The feed port is provided in two or more ways, and the end of each feed port is connected to the flow channel system. The end of the flow channel system is connected to the die lip. The flow channel system includes a main flow channel and a distribution flow channel. The end of each feed port is connected to the main flow channel. The distribution flow channel is an irregularly shaped flow channel, and the end of the distribution flow channel is connected to the die lip.
[0006] As a preferred design, the die head body includes an upper template and a lower template, with a gap between the upper template and the lower template to form a feed inlet and a flow channel system, respectively. The die lip is located on the side of the upper template and the lower template, and the middle of the die lip has a lip cavity. The two ends of the lip cavity are respectively connected to the distribution channel and the outside.
[0007] As a preferred design, filters are provided between each feed inlet and the flow channel system.
[0008] As a preferred design, two feed inlets are provided, and the included angle between the two feed inlets is 15° to 45°.
[0009] As a preferred design, the main channel has two or more small end openings and a large end opening, each feed port is connected to the corresponding small end opening, and each distribution channel is connected to the large end opening of the main channel.
[0010] As a preferred design, the cross-sectional dimensions of each of the distribution channels are different to form irregularly shaped channels;
[0011] Each distribution channel has different cross-sectional dimensions at different locations to form irregularly shaped channels.
[0012] As a preferred design, each of the distribution channels is provided with a throttling valve.
[0013] As a preferred design, the lip cavity of the mold lip is an irregularly shaped lip cavity, and the thickness difference of the lip cavity along the transverse extension direction of the mold head is 0.0 to 0.1 mm.
[0014] As a preferred design, the die head is also provided with multiple heaters, which are electrically heated or heated by hot oil.
[0015] As a preferred design, the mold head is equipped with multiple temperature sensors.
[0016] This utility model provides a casting co-extrusion die for a water-pattern decorative film, which has the following advantages compared with the prior art:
[0017] In this invention, the irregular structure design of the distribution channel allows for precise control of local thickness during co-extrusion. The flowing melt enters the distribution channel and fills its interior completely, resulting in a decorative film with the same thickness as each part of the distribution channel. This enables dynamic control of the decorative film thickness distribution, eliminating the need for post-printing or embossing processes, resulting in low energy consumption and adjustable patterns. Attached Figure Description
[0018] Figure 1 A side view of a casting co-extrusion die for a water-pattern decorative film provided by this utility model;
[0019] Figure 2 for Figure 1 Enlarged view of the local structure at point A;
[0020] Figure 3 A schematic diagram of the flow channel system provided by this utility model;
[0021] Figure 4 This is a cross-sectional view of an embodiment of the present utility model.
[0022] In the picture:
[0023] 1-Upper mold plate, 2-Lower mold plate, 3-Inlet, 4-Main runner, 5-Distribution runner, 6-Mold lip, 7-Filter, 8-Throttle valve, 9-Heater, 10-Temperature sensor. Detailed Implementation
[0024] The technical solutions of various 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, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying 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, and therefore should not be construed as a limitation of this utility model.
[0025] Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0026] The present invention will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings.
[0027] Example 1:
[0028] like Figures 1-4As shown, a co-extrusion die head for a water-pattern decorative film includes a die head body, which comprises an upper template 1 and a lower template 2. The upper template 1 and the lower template 2 are fixed together by screws. Sealing plates (not shown in the figure) are provided on both sides of the upper template 1 and the lower template 2. A gap exists between the upper template 1 and the lower template 2 to form a cavity, which serves as a feed inlet 3 and a flow channel system, respectively. The inlet 3 is located at the end of the die head body, and the flow channel system is located inside the die head body. Two or more feed inlets 3 are provided, such as two, three, four, five, etc. This embodiment uses two feed inlets 3 as an example; this is only an example, and other numbers of feed inlets 3 can be set as needed in actual use. Each feed inlet 3 is connected to two parallel extruders. One extruder extrudes a PC / PMMA material of one color, for example, one extrudes a blue PC / PMMA mixture, and the other extrudes a yellow PC / PMMA mixture to obtain a colored water-pattern decorative film. The flow channel system includes a main flow channel 4 and distribution flow channels 5. The ends of each feed port 3 are connected to the main flow channel 4, and the main flow channel 4 is connected to the distribution flow channels 5. The ends of the distribution flow channels 5 are connected to the die lip 6. The cross-sectional dimensions of the main flow channel 4 are larger than those of the distribution flow channels 5. The distribution flow channels 5 are irregularly shaped, with their outlines varying in the horizontal X-axis, horizontal Y-axis, and longitudinal Z-axis. They are curved rather than straight, and are non-statically designed. The cross-sectional dimensions of each distribution flow channel 5 are different at different locations, and the cross-sectional shape and size vary in the width direction of the die head. For example, in some areas of the die head, the cross-sectional area of the distribution flow channels 5 is larger, resulting in a larger melt flow rate in these areas, thus forming a thicker film layer; while in other areas, the cross-sectional area of the distribution flow channels 5 is smaller, resulting in a smaller melt flow rate, forming a thinner film layer.
[0029] By designing the irregular structure of the distribution channel 5, precise control of local thickness can be achieved during co-extrusion. The flowing melt enters the distribution channel 5 and fills its interior completely, thus obtaining a decorative film with the same thickness as each part of the distribution channel 5, thereby achieving dynamic control of the thickness distribution of the decorative film.
[0030] The end of the distribution channel 5 is connected to the die lip 6. The die lip 6 is located to the side of the upper mold plate 1 and the lower mold plate 2, and can be fixed to the upper mold plate 1 and the lower mold plate 2 with screws. The die lip 6 has a lip cavity in the middle, and the two ends of the lip cavity are connected to the distribution channel 5 and the outside, respectively. The end of each feed port 3 is connected to the flow channel system, and the end of the flow channel system is connected to the die lip 6. The heated melt enters the flow channel system from each feed port 3 and then flows out to the die lip 6. The die lip 6 serves as the final channel for melt extrusion, and the melt flowing out from the die lip 6 enters the subsequent processes.
[0031] Preferably, in this embodiment, the included angle between the two feed ports 3 is 15° to 45°. The purpose of this design is to make the two colors of melt mix more thoroughly after contact. If the included angle is too large, it will also lead to uneven mixing and failure to obtain a better colored decorative film.
[0032] Preferably, a filter 7 is provided between each feed inlet 3 and the flow channel system. The filter 7 can be a commercially available filter. The filter 7 can filter impurities in the melt and ensure product quality.
[0033] Even better, the main channel 4 has two or more small-end openings and a large-end opening, with each feed port 3 corresponding to a small-end opening, and each distribution channel 5 connected to the large-end opening of the main channel 4. The entire main channel 4 forms a funnel-like structure, with the large-end opening of the main channel 4 almost occupying the entire width of the die head. This design allows the melt to be evenly distributed across the width of the entire die head from the feed port 3.
[0034] Even better, the cross-sectional dimensions of each distribution channel 5 are different to form irregularly shaped channels, further improving the accuracy of thickness distribution control.
[0035] Each distribution channel 5 is equipped with a throttle valve 8. By adjusting the opening of the throttle valve 8, the melt flow rate in each area can be further precisely controlled, thereby adjusting the thickness distribution of the film layer and further improving the control accuracy.
[0036] The die lip 6 also has an irregularly shaped cavity. As the final channel for melt extrusion, the shape and size of the die lip 6 directly affect the final shape and quality of the film. In this embodiment, the opening width of the die lip 6 varies in the width direction of the die head, which, in conjunction with the design of the distribution channel 5, further enhances the thickness difference at different locations. Furthermore, the thickness difference of the lip cavity along the transverse extension direction of the die head is 0.01-0.1 mm, achieving a gradient change in transverse thickness of 0.01-0.1 mm. Simultaneously, the surface of the die lip 6 undergoes fine machining to ensure surface smoothness, thereby reducing melt flow resistance and film surface defects.
[0037] Example 2:
[0038] Based on Example 1, this example is further improved by adding a heating device inside the die head. The heating device can be a heater 9, which can be electric or hot oil heating. Electric heating is preferred to uniformly heat the die head and maintain the melt inside the die head at a suitable temperature to ensure the fluidity of the melt and the molding quality.
[0039] Even better, multiple temperature sensors 10 are installed inside the mold head to monitor the temperature of various parts of the mold head in real time and feed the signals back to the control system. For example, 6-12 sets of independent temperature sensors 10 can be equipped to achieve a temperature control accuracy of ±1℃.
[0040] When using it, prepare two parallel extruders, one for extruding PC / PMMA material of two different colors, and connect the outlet of the extruder to the corresponding feed port 3.
[0041] Production Process: The heating devices of the extruder and die are activated to heat the extruder and die to the set temperature. Two colors of PC / PMMA material are extruded from the two extruders respectively, entering the die through the feed port 3. The melt flows in the main flow channel 4 and the distribution channel 5 of the die. Due to the irregular design of the distribution channel 5 and the regulating effect of the throttle valve 8, the flow rate and thickness of the melt vary at different locations. The melt is extruded through the die lip 6, and after the two layers are co-extruded and superimposed, it is cast onto the cooling roller for cooling and shaping to form a decorative film with flowing patterns.
[0042] The present invention has been described in detail above through specific embodiments and examples, but these are not intended to limit the present invention. Many modifications and improvements can be made by those skilled in the art without departing from the principles of the present invention, and these should also be considered within the scope of protection of the present invention.
Claims
1. A cast co-extrusion die for a waterline decorative film, characterized by, The die head comprises a die head body, which is provided with feeding ports (3), a flow channel system and a die lip (6). Two or more feeding ports (3) are provided, the ends of each feeding port (3) are communicated with the flow channel system, the ends of the flow channel system are communicated with the die lip (6), the flow channel system comprises a main flow channel (4) and a distribution flow channel (5), the ends of each feeding port (3) are communicated with the main flow channel (4), the distribution flow channel (5) is a special-shaped flow channel, and the ends of the distribution flow channel (5) are communicated with the die lip (6).
2. The cast co-extrusion die for a waterline decoration film according to claim 1, characterized in that, The die head body comprises an upper die plate (1) and a lower die plate (2), and the upper die plate (1) and the lower die plate (2) are spaced apart to form the feeding ports (3) and the flow channel system, respectively. The die lip (6) is located at the side of the upper die plate (1) and the lower die plate (2), and the middle part of the die lip (6) has a lip cavity, and the two ends of the lip cavity are communicated with the distribution flow channel (5) and the outside, respectively.
3. The cast co-extrusion die for a waterline decoration film according to claim 1, characterized in that, A filter (7) is arranged between each feeding port (3) and the flow channel system.
4. The cast co-extrusion die for a flowline decorative film according to claim 1, wherein Two feeding ports (3) are provided, and the included angle between the two feeding ports (3) is 15°-45°.
5. The cast co-extrusion die for a flowline decorative film according to claim 1, wherein The main flow channel (4) has two or more small end openings and one large end opening, each feeding port (3) is communicated with a corresponding small end opening, and each distribution flow channel (5) is connected at the large end opening of the main flow channel (4).
6. The cast co-extrusion die for a flowline trim film according to claim 5, wherein The cross-sectional dimensions of each distribution flow channel (5) are different to form a special-shaped flow channel. The cross-sectional dimensions of each distribution flow channel (5) are different at different positions to form a special-shaped flow channel.
7. The cast co-extrusion die for a flowline decorative film according to any one of claims 1 to 6, characterized in that Each distribution flow channel (5) is provided with a throttle valve (8).
8. The cast co-extrusion die for a flowline trim film according to claim 1, wherein The lip cavity of the die lip (6) is a special-shaped structure, and the thickness difference of the lip cavity along the transverse extension direction of the die head is 0.0-0.1 mm.
9. The cast co-extrusion die for a flowline trim film according to claim 1, wherein A plurality of heaters (9) are arranged in the die head, and the heaters (9) are electric heating or hot oil heating.
10. The cast co-extrusion die for a flowline trim film according to claim 1, wherein A plurality of temperature sensors (10) are arranged in the die head.