A film extruded multilayer dispenser structure suitable for color masterbatch

Abstract

This utility model relates to the field of multilayer distributor technology, and more particularly to a multilayer distributor structure for film extrusion suitable for colored masterbatches. It includes a main flow channel block, inside which are arranged main flow channels and laminar flow channels. A multilayer confluence module is arranged on one side of the main flow channel block. Inside the multilayer confluence module are several mutually isolated and parallel material distribution channels. A dynamic mixer is arranged inside each material distribution channel. A co-extrusion die connecting block is arranged on the side of the multilayer confluence module away from the main flow channel block. This utility model fundamentally solves the problems of color lines, color spots, and cloudiness caused by the lack of mixing function in traditional distributors, improving the color uniformity, brightness, and overall appearance quality of colored films. Simultaneously, it achieves precise control of the material flow in each layer, ensuring continuous stability of color dispersion and lamination quality.

Description

Technical Field

[0001] This utility model relates to the field of multilayer distributor technology, specifically a multilayer distributor structure for film extrusion suitable for color masterbatches. Background Technology

[0002] Polymer film materials are widely used in packaging, agriculture, medical, and electronics fields due to their excellent properties. With the continuous expansion of application scenarios, the market is placing higher demands on the performance and appearance of film products, such as producing multi-layered functional or colored films using co-extrusion technology. These films are typically composed of a base resin layer and a masterbatch layer containing a high concentration of pigments or functional additives. In the production process of multi-layer co-extruded films, the multilayer distributor is the core component of the extrusion molding system. Its function is to precisely distribute and stack various melt flows from different extruders through an internal flow channel system, ultimately forming the desired multi-layered structure and conveying it to the die head.

[0003] Traditional multilayer distributors suffer from poor color dispersion uniformity. When melt containing colored masterbatch flows through the distributor, the dispersion of the masterbatch in the base resin mainly depends on the mixing effect of the upstream extruder. If the mixing is insufficient, the melt is transported in a laminar flow state within the distributor, which easily leads to uneven pigment distribution. This results in obvious appearance defects such as "color lines," "color spots," or "mounding patterns" on the final formed film, seriously affecting the product's appearance and grade.

[0004] Meanwhile, existing distributors are either one-piece or have a fixed number of layers, with fixed channel dimensions. Different colored masterbatches often exhibit vastly different rheological properties due to variations in pigment composition, particle size, and carrier. Fixed channel structures are difficult to adapt to all masterbatches, and cannot optimize the flow balance of materials in each layer by adjusting channel resistance, resulting in inaccurate interlayer thickness control. Furthermore, changing the layer structure of the film requires replacing the entire distributor module, which is cumbersome, costly, and unable to quickly respond to the market's diverse demands for product structures. No solutions have yet been proposed to address these technical problems. Utility Model Content

[0005] To address the problems in related technologies, this utility model proposes a multilayer distributor structure for film extrusion suitable for color masterbatches, overcoming the aforementioned technical issues in existing technologies. The purpose of this utility model is to achieve online, independent secondary mixing of each layer of melt before lamination, enabling powerful segmentation, shearing, and recombination of the melt flow containing color masterbatches. This completely breaks down color agglomeration that may result from insufficient upstream mixing, allowing pigments to achieve near-perfect dispersion in the base resin. It fundamentally solves the problems of color lines, color spots, and cloudiness caused by the lack of mixing function in traditional distributors, improving the color uniformity, brightness, and overall appearance quality of the colored film. At the same time, it achieves precise control of the flow of materials in each layer, ensuring the continuous stability of color dispersion and lamination quality.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a multi-layer distributor structure for film extrusion suitable for color masterbatches, comprising a main flow channel block, wherein the main flow channel block is provided with a main flow channel and a laminar flow channel, a multi-layer confluence module is provided on one side of the main flow channel block, wherein the multi-layer confluence module is provided with a plurality of mutually isolated and parallel material distribution channels, wherein the inlet of the material distribution channel is connected to the outlet of the laminar flow channel, wherein a dynamic mixer is provided inside the material distribution channel, and a co-extrusion die head connecting block is provided on the side of the multi-layer confluence module away from the main flow channel block, wherein the co-extrusion die head connecting block is provided with a composite flow channel that stacks and combines the melt collected from the outlets of the plurality of material distribution channels.

[0007] Preferably, the dynamic mixer consists of several alternating twisting mixing units and is fixedly installed inside the material distribution channel.

[0008] Preferably, the surface of the mixing unit is provided with raised turbulence teeth and recessed turbulence grooves.

[0009] Preferably, the main flow channel block is connected to the multi-layer manifold module via flange one, the multi-layer manifold module is connected to the co-extrusion die head connecting block via flange two, a high-temperature resistant sealing element one is provided between the main flow channel block and the multi-layer manifold module, and a high-temperature resistant sealing element two is provided between the multi-layer manifold module and the co-extrusion die head connecting block.

[0010] Preferably, the composite flow channel has a tapered tapered structure, and the inlet cross-sectional area of ​​the composite flow channel is larger than the outlet cross-sectional area, which is used to pre-compress the laminated melt.

[0011] Preferably, the outlet of the material distribution channel is equipped with a flow regulating valve.

[0012] Preferably, heating rods and temperature sensors are provided on the outer walls of the main flow channel block, the multi-layer confluence module, and the co-extrusion die head connecting block.

[0013] Preferably, the laminar flow channel is provided in several parts and is divided by the main flow channel.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] (1) This utility model is a multi-layer distributor structure for film extrusion suitable for color masterbatch. By setting a dynamic mixer inside the material distribution channel, it realizes online and independent secondary mixing of each layer of melt before lamination. It can strongly divide, shear and reorganize the melt flow containing color masterbatch, completely break the color agglomeration that may be caused by insufficient upstream mixing, and make the pigment achieve near-perfect dispersion in the base resin. It fundamentally solves the problems of color lines, color spots and cloud patterns caused by the lack of mixing function of traditional distributors, and improves the color uniformity, brightness and overall appearance quality of color film.

[0016] (2) This utility model is a multilayer distributor structure for film extrusion suitable for colored masterbatch. By setting a flow regulating valve, the operator can independently and precisely fine-tune the outlet flow of each layer of material distribution channel, accurately control the thickness ratio of each layer of the final film product. At the same time, in view of the differences in rheological characteristics of different colored masterbatches, the flow resistance and outlet pressure of each layer of material can be balanced by customizing the flow module with different channel size, so as to ensure that the multilayer melt has a stable flow field at the composite interface, thereby obtaining a high-quality film with uniform thickness and clear interlayer interface.

[0017] (3) This utility model is a multilayer distributor structure for film extrusion suitable for color masterbatch. The tapered tapered composite flow channel can perform stable pre-compression and rectification of the stacked melt, effectively eliminate turbulence, promote molecular diffusion and entanglement of each layer of melt at the interface, enhance interlayer composite strength, and ensure the stability of the outlet melt sheet. The flange connection and high-temperature resistant sealing parts are used to ensure the tightness of the connection and the reliability of the seal of each module under the harsh process conditions of high temperature and high pressure, effectively prevent melt leakage, ensure the continuity and safety of production, and reduce maintenance costs.

[0018] (4) This utility model is a multilayer distributor structure for film extrusion suitable for color masterbatch. Heating rods and temperature sensors are provided on the outer walls of the main flow channel block, the multilayer confluence module and the co-extrusion die head connecting block to form a complete and independent temperature control system. This ensures that the melt temperature is always kept within the optimal range required by the process from the material entering the distributor to the final composite outlet, avoiding problems such as changes in material viscosity and unstable flow caused by temperature fluctuations or heat loss, thereby ensuring the continuous stability of color dispersion effect and lamination quality. Attached Figure Description

[0019] Figure 1This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0021] Figure 3 for Figure 2 An enlarged structural diagram of part A;

[0022] Figure 4 This is a schematic diagram of the main flow channel block of this utility model.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Main flow channel block; 101. Main flow channel; 102. Laminar flow channel; 2. Multi-layer confluence module; 201. Material distribution flow channel; 3. Dynamic mixer; 301. Turbulence teeth; 302. Turbulence groove; 4. Co-extrusion die head connecting block; 401. Composite flow channel; 5. Flow regulating valve; 6. Heating rod; 7. Temperature sensor. Detailed Implementation

[0025] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0026] Example

[0027] Please see Figure 1-4This invention proposes a technical solution for a multi-layer distributor structure for film extrusion of color masterbatches: A multi-layer distributor structure for film extrusion of color masterbatches includes a main flow channel block 1. The main flow channel block 1 has a main flow channel 101 and a laminar flow channel 102 inside. Specifically, the main flow channel block 1 is responsible for the initial guidance and flow control of the material. The main flow channel 101 serves as the main material guide channel, while the laminar flow channel 102 diverts the material to different distribution channels. To maintain stable and uniform flow, a flow regulating device should be configured at the inlet of the main flow channel 101 to ensure uniform material flow into the laminar flow channel. A multi-layer confluence module 2 is provided on one side of the main flow channel block 1. The multi-layer confluence module 2 has several mutually isolated and parallel material distribution channels 201 inside. The inlet of the material distribution channel 201 is connected to the outlet of the laminar flow channel 102. The material distribution channel 201 is equipped with a dynamic mixer 3. Specifically, the multi-layer confluence module 2 is a key component for dividing and combining different materials. Several material distribution channels 201 need to ensure that their inlets are precisely connected to the outlets of the laminar flow channels to avoid mixing or cross-contamination of materials. The dynamic mixer 3 can improve the mixing effect. A co-extrusion die head connecting block 4 is provided on the side of the multi-layer confluence module 2 away from the main flow channel block 1. The co-extrusion die head connecting block 4 is equipped with a composite flow channel 401 that gathers the melt from the outlets of several material distribution channels 201 and performs layering and composite. Specifically, the function of the co-extrusion die head connecting block 4 is to uniformly gather the melt flow from multiple distribution channels and perform layering and composite.

[0028] Please see Figure 2-3 As shown, the dynamic mixer 3 is further composed of several alternating twisting mixing units and is fixedly installed inside the material distribution channel 201.

[0029] In this embodiment, the mixing effect of materials can be enhanced.

[0030] Please see Figure 2-3 As shown, the surface of the mixing unit is further provided with raised turbulence teeth 301 and recessed turbulence grooves 302.

[0031] In this embodiment, in order to further improve the mixing effect, the turbulence during mixing is increased and the mixing efficiency is improved by setting the raised turbulence teeth 301 and the recessed turbulence grooves 302.

[0032] Please see Figure 1-2 As shown, the main flow channel block 1 is further connected to the multi-layer manifold module 2 via flange one, and the multi-layer manifold module 2 is connected to the co-extrusion die head connecting block 4 via flange two. A high-temperature resistant sealing element one is provided between the main flow channel block 1 and the multi-layer manifold module 2, and a high-temperature resistant sealing element two is provided between the multi-layer manifold module 2 and the co-extrusion die head connecting block 4.

[0033] In this embodiment, a flange connection combined with high-temperature resistant seals is used to ensure the tightness of the connection and the reliability of the seal between the modules under the harsh process conditions of high temperature and high pressure, effectively preventing melt leakage, ensuring the continuity and safety of production, and reducing maintenance costs.

[0034] Please see Figure 1-2 As shown, the composite flow channel 401 is further a tapered tapered structure, with the inlet cross-sectional area of ​​the composite flow channel 401 being larger than the outlet cross-sectional area, used to pre-compress the laminated melt.

[0035] In this embodiment, pre-compression can be performed after the melt flow and coalescence to ensure the uniformity and lamination of the melt, thereby obtaining higher surface quality and better film thickness uniformity during the film extrusion process.

[0036] Please see Figure 2 As shown, a flow regulating valve 5 is further provided at the outlet of the material distribution channel 201.

[0037] In this embodiment, the flow distribution of each distribution channel is adjusted in real time according to production needs to ensure the accurate proportion of melt in each layer.

[0038] Please see Figure 2 As shown, heating rods 6 and temperature sensors 7 are further provided on the outer walls of the main flow channel block 1, the multi-layer confluence module 2 and the co-extrusion die head connecting block 4.

[0039] In this embodiment, thermal stability during operation is ensured by precisely controlling the heating temperature; the temperature sensor 7 can monitor the temperature changes in the flow channel in real time, providing feedback data to the control system and ensuring that the temperature of the material is kept within the optimal range throughout the process.

[0040] Please see Figure 2 As shown, furthermore, the laminar flow channel 102 is provided with several channels, and is diverted by the main flow channel 101.

[0041] In this embodiment, the laminar flow channel 102 is diverted by the main flow channel 101 to ensure that the material in each layer can enter the material distribution channel 201 accurately and evenly, and avoid quality fluctuations caused by uneven material distribution.

[0042] The working principle of this utility model:

[0043] The film extrusion multilayer distributor is activated. The main flow channel block 1 receives and guides the material, which is then conveyed to the laminar flow channel 102 via the main flow channel 101. A flow regulating device is installed at the inlet of the main flow channel to ensure a stable and uniform flow rate as the material flows into the laminar flow channel. The material then enters the multilayer confluence module 2 located on one side of the main flow channel block 1 through the laminar flow channel 102. The laminar flow channel 102 distributes the material to different material distribution channels 201. The inlet of each distribution channel precisely connects to the outlet of the laminar flow channel to avoid cross-contamination. Inside the material distribution channel 201, a dynamic mixer 3 is installed, consisting of multiple alternating twisting mixing units to ensure uniform mixing of the material. The surface of each mixing unit has raised baffle teeth 301. The recessed turbulence groove 302 enhances the turbulence of material mixing through its turbulence effect, thereby accelerating the mixing process and ensuring thorough mixing of materials. The mixed melt flows out through the outlet of the material distribution channel 201 and enters the co-extrusion die head connecting block 4. The composite channel 401 inside the co-extrusion die head connecting block 4 collects and layers the melt from different distribution channels. The composite channel has a tapered tapered structure with an inlet cross-sectional area larger than the outlet cross-sectional area to pre-compress the melt and ensure the uniformity of the layered melt. At the outlet of each material distribution channel 201, a flow regulating valve 5 is installed to adjust the flow distribution of each distribution channel in real time, ensuring accurate proportioning of each layer of melt and avoiding uneven flow.

[0044] Heating rods 6 and temperature sensors 7 are installed on the outer walls of the main flow channel block 1, the multi-layer confluence module 2, and the co-extrusion die head connecting block 4 to maintain the thermal stability of the system. The temperature sensors monitor the temperature changes within the system in real time and feed the data back to the control system to ensure that the material temperature is always kept within the optimal range, avoiding melt quality problems caused by temperature fluctuations.

[0045] In the description of this utility model, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "side", "top", "inner", "front", "center", "both ends", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They 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. Therefore, they should not be construed as limitations on this utility model.

[0046] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0047] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multilayer distributor structure for film extrusion suitable for color masterbatches, characterized in that, The system includes a main flow channel block (1), which has a main flow channel (101) and a laminar flow channel (102) inside. A multi-layer confluence module (2) is provided on one side of the main flow channel block (1). The multi-layer confluence module (2) has several mutually isolated and parallel material distribution channels (201) inside. The inlet of the material distribution channel (201) is connected to the outlet of the laminar flow channel (102). A dynamic mixer (3) is provided inside the material distribution channel (201). A co-extrusion die head connecting block (4) is provided on the side of the multi-layer confluence module (2) away from the main flow channel block (1). The co-extrusion die head connecting block (4) has a composite flow channel (401) inside which the melt from the outlets of several material distribution channels (201) is stacked and compounded.

2. The multilayer distributor structure for film extrusion suitable for color masterbatch according to claim 1, characterized in that, The dynamic mixer (3) consists of several alternating twisting mixing units and is fixedly installed inside the material distribution channel (201).

3. The multilayer distributor structure for film extrusion suitable for color masterbatch according to claim 2, characterized in that, The surface of the mixing unit is provided with raised turbulence teeth (301) and recessed turbulence grooves (302).

4. The multilayer distributor structure for film extrusion suitable for color masterbatch according to claim 1, characterized in that, The main flow channel block (1) is connected to the multi-layer manifold module (2) through flange one, and the multi-layer manifold module (2) is connected to the co-extrusion die head connecting block (4) through flange two. A high-temperature resistant sealing element one is provided between the main flow channel block (1) and the multi-layer manifold module (2), and a high-temperature resistant sealing element two is provided between the multi-layer manifold module (2) and the co-extrusion die head connecting block (4).

5. The multilayer distributor structure for film extrusion suitable for color masterbatch according to claim 1, characterized in that, The composite flow channel (401) has a tapered and tapered structure. The inlet cross-sectional area of ​​the composite flow channel (401) is larger than the outlet cross-sectional area, which is used to pre-compress the laminated melt.

6. The multilayer distributor structure for film extrusion suitable for color masterbatch according to claim 1, characterized in that, The outlet of the material distribution channel (201) is equipped with a flow regulating valve (5).

7. The multilayer distributor structure for film extrusion suitable for color masterbatch according to claim 1, characterized in that, Heating rods (6) and temperature sensors (7) are provided on the outer walls of the main flow channel block (1), the multi-layer confluence module (2) and the co-extrusion die head connecting block (4).

8. The multilayer distributor structure for film extrusion suitable for color masterbatch according to claim 1, characterized in that, The laminar flow channel (102) is provided in several parts and is divided by the main flow channel (101).

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