Extruder and apparatus for multilayer coextruded film

Abstract

The utility model relates to floor production technical field especially relates to a kind of extruder and equipment for multilayer co-extrusion film.Extruder includes cylinder, screw, hopper, driving device and multiple temperature regulating units, the length-diameter ratio of screw is 25-30:1, screw is made more sufficient, more uniform by setting larger length-diameter ratio, material plasticization between screw and cylinder, can use smaller driving device under the same condition, to further reduce energy consumption.Each temperature regulating unit includes heating unit and fan heat dissipation unit, fan heat dissipation unit is communicated with heating unit to heat dissipation to heating unit.Because temperature regulating unit uses air-cooled mode to make cooling mode more gentle, can greatly reduce the frequent start-stop heating caused by temperature fluctuation, to further reduce energy consumption, and reduce the equipment wear and tear and damage due to thermal fatigue, prolong the life of equipment.

Description

Technical Field

[0001] This utility model relates to the field of film production technology, and in particular to an extruder and equipment for multilayer co-extrusion films. Background Technology

[0002] In the field of film production, the extruder is the core forming equipment. Its working principle is to heat solid plastic particles to a molten state and extrude them with the help of a mold of a specific shape to obtain plastic profiles with a preset cross-section.

[0003] In existing extruder systems, water cooling is widely used due to its low cost and fast cooling response, for controlling the temperature during the heating and melting process of plastic particles. However, because of its rapid cooling speed, water cooling requires frequent reheating to maintain the system temperature, resulting in high system energy consumption. Utility Model Content

[0004] (a) Technical problems to be solved In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a multilayer co-extrusion film equipment, which solves the technical problem of high energy consumption of the equipment.

[0005] (II) Technical Solution To achieve the above objectives, the main technical solutions adopted by this utility model include: This utility model provides an extruder for multilayer co-extrusion films. The extruder includes a barrel, a screw, a hopper, a drive unit, and multiple temperature control units. The hopper is connected to the input end of the barrel. The screw is coaxially disposed inside the barrel, and the drive unit drives the screw to rotate. The length-to-diameter ratio of the screw is 25-30:1. Multiple temperature control units are arranged sequentially along the axial direction of the barrel. Each temperature control unit includes a heating unit and a fan cooling unit. The heating unit is sleeved on the outer periphery of the barrel and is used to heat the barrel. The fan cooling unit is connected to the heating unit to dissipate heat from the heating unit.

[0006] Preferably, the heating unit includes a heating element and a cover covering the heating element; the heating element is sleeved on the outer periphery of the barrel and the inner wall of the heating element is in contact with the outer wall of the barrel to heat the barrel; the outer wall of the heating element and the cover form a heat dissipation duct, and the cover is provided with a first air inlet and a first air outlet communicating with the heat dissipation duct; the air outlet of the fan heat dissipation unit is connected to the first air inlet to provide cooling air to the heat dissipation duct.

[0007] Preferably, the inner wall of the heating element has multiple heat dissipation grooves spaced apart along its circumference; a second air inlet and a second air outlet connected to the heat dissipation grooves are correspondingly provided on the wall of the heating element; the two ends of the heat dissipation grooves are connected to the second air inlet and the second air outlet respectively; the second air inlet, the heat dissipation grooves and the second air outlet together form an auxiliary heat dissipation channel.

[0008] Preferably, the first air inlet is opposite to the second air inlet, and the first air outlet is opposite to the second air outlet.

[0009] Preferably, the fan cooling unit includes a fan body and an air guide shroud; the air outlet of the fan body is located inside the air guide shroud, and the air outlet of the air guide shroud is connected to the first air inlet.

[0010] Preferably, the cover and the air guide are detachably connected.

[0011] Preferably, the heating element is formed by splicing two semi-annular sleeves, which are detachably connected; the splice of the two semi-annular sleeves forms a second air inlet and a second air outlet.

[0012] Preferably, the cover is formed by splicing together multiple spliced ​​covers.

[0013] This utility model also provides a device for multilayer co-extrusion film, including the above-mentioned extruder and a multi-combination die; the discharge ends of the multiple extruders are connected to the inlet of the multi-combination die.

[0014] (III) Beneficial Effects The beneficial effects of this utility model are: This invention provides an extruder for multilayer co-extrusion films. The extruder includes a barrel, a screw, a hopper, a drive unit, and multiple temperature control units. The hopper is connected to the input end of the barrel. The screw is coaxially mounted inside the barrel, and the drive unit drives the screw to rotate. The screw's length-to-diameter ratio is 25-30:1. By setting a larger length-to-diameter ratio, the material between the screw and the barrel is plasticized more fully and uniformly. Under the same conditions, a lower-power drive unit can be used, thereby reducing energy consumption. Multiple temperature control units are arranged sequentially along the axial direction of the barrel. Each temperature control unit includes a heating unit and a fan cooling unit. The heating unit is fitted around the outer circumference of the barrel for heating the barrel, and the fan cooling unit is connected to the heating unit to dissipate heat from the heating unit. Because the temperature control units use air cooling, the cooling method is more gentle, which can significantly reduce the frequent start-up and shutdown of the system due to drastic temperature fluctuations, thereby further reducing energy consumption and reducing equipment wear and damage caused by thermal fatigue, extending equipment life.

[0015] This invention provides a multilayer co-extrusion film equipment. Because the screw in the extruder has a larger length-to-diameter ratio, the material between the screw and the barrel is plasticized more fully and uniformly. Under the same conditions, a lower-power drive device can be used, thus reducing energy consumption. Simultaneously, the use of air cooling in the temperature control unit makes the cooling process gentler, significantly reducing the frequent start-stop heating caused by drastic temperature fluctuations, thereby further reducing energy consumption and minimizing equipment wear and damage due to thermal fatigue, extending equipment lifespan. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the extruder for multilayer co-extruded film in Example 1; Figure 2 for Figure 1 A longitudinal sectional view; Figure 3 This is a schematic diagram of the temperature control unit. Figure 4 for Figure 3 A longitudinal sectional view; Figure 5 for Figure 3 An exploded view (the casing is not shown). Figure 6 This refers to the equipment used for multilayer co-extrusion films in Example 2.

[0017] [Explanation of Labels in the Attached Image] 1: Extruder; 11: Barrel; 12: Screw; 13: Hopper; 14: Drive unit; 15: Temperature control unit; 151: Heating unit; 1511: Heating element; 1512: Cover; 1513: First air inlet; 1514: First air outlet; 1516: Heat dissipation groove; 1517: Second air inlet; 1518: Second air outlet; 152: Fan heat dissipation unit; 1521: Fan body; 1522: Air guide shroud; 16: Frame; 2: Multi-part mold. Detailed Implementation

[0018] To better explain and facilitate understanding of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] Example 1 like Figure 1 and Figure 2 As shown, this embodiment of the invention provides an extruder for multilayer co-extrusion films. The extruder 1 includes a frame 16 and a barrel 11, a screw 12, a hopper 13, a drive unit 14, and multiple temperature control units 15 disposed on the frame 16. The hopper 13 is connected to the input end of the barrel 11. The screw 12 is coaxially disposed inside the barrel 11. The drive unit 14 drives the screw 12 to rotate and interact with the barrel 11 to convey, melt, plasticize, and meter the material. In this embodiment, the length-to-diameter ratio of the screw 12 is 25-30:1. By setting a larger length-to-diameter ratio, the material between the screw 12 and the barrel 11 is plasticized more fully and uniformly. Under the same conditions, a less powerful drive unit 14 can be used, thereby reducing energy consumption.

[0020] Multiple temperature control units 15 are arranged sequentially along the axial direction of the casing 11. Each temperature control unit 15 includes a heating unit 151 and a fan cooling unit 152, realizing the integration and modularization of heating and cooling functions. The heating unit 151 is sleeved on the outer periphery of the casing 11 for heating the casing 11. The fan cooling unit 152 is connected to the heating unit 151 to dissipate heat from the heating unit 151. Because the temperature control unit 15 uses air cooling, the cooling method is more gentle, which can significantly reduce the frequent start-stop heating of the system caused by drastic temperature fluctuations, thereby further reducing energy consumption, reducing equipment wear and damage caused by thermal fatigue, and extending equipment life.

[0021] like Figure 3 and Figure 4 As shown, the heating unit 151 includes a heating element 1511 and a cover 1512 covering the heating element 1511. The heating element 1511 is sleeved on the outer periphery of the barrel 11, and the inner wall of the heating element 1511 is in contact with the outer wall of the barrel 11 to heat the barrel 11. The outer wall of the heating element 1511 and the cover 1512 enclose each other to form a heat dissipation duct. The cover 1512 is provided with a first air inlet 1513 and a first air outlet 1514 communicating with the heat dissipation duct. The air outlet of the fan cooling unit 152 is connected to the first air inlet 1513 to provide cooling air to the heat dissipation duct. Through the cooperation of the cover 1512 and the outer wall of the heating element 1511, a closed air duct surrounding the heating element 1511 is formed, which can effectively guide the path of the cooling airflow and improve the utilization efficiency of the cooling air. At the same time, in order to improve the guiding effect, the cover 1512 forms an inclined angle at the bend.

[0022] like Figure 4 and Figure 5 As shown, the inner wall of the heating element 1511 has multiple heat dissipation grooves 1516 spaced apart along its circumference. A second air inlet 1517 and a second air outlet 1518, communicating with the heat dissipation grooves 1516, are correspondingly provided on the wall of the heating element 1511. The two ends of the heat dissipation grooves 1516 are respectively connected to the second air inlet 1517 and the second air outlet 1518. The second air inlet 1517, the heat dissipation grooves 1516, and the second air outlet 1518 together form an auxiliary heat dissipation channel. By providing an auxiliary heat dissipation channel communicating with the outside on the inner wall of the heating element 1511, the cooling air can directly contact the inner wall of the heating element 1511, further improving heat dissipation efficiency. Meanwhile, the outer wall of the heating element 1511 is cooled by the external heat dissipation duct, and the inner wall of the heating element 1511 is cooled by the internal auxiliary heat dissipation channel, so as to remove the heat accumulated on the surface of the barrel 11 more quickly and directly, thereby significantly improving the heat dissipation speed and heat dissipation uniformity of the entire temperature regulation unit 15.

[0023] like Figure 4As shown, the first air inlet 1513 on the cover 1512 is opposite to the second air inlet 1517 of the heating element 1511, and the first air outlet 1514 on the cover 1512 is opposite to the second air outlet 1518 of the heating element 1511. This allows the cooling airflow from the external heat dissipation duct to flow smoothly and unobstructed directly into the internal auxiliary heat dissipation duct, ensuring the smoothness and efficiency of the cooling airflow in the internal and external air ducts.

[0024] like Figure 5 As shown, the heating element 1511 is formed by splicing two semi-annular sleeves. The two semi-annular sleeves are detachably connected, which facilitates the installation or removal of the heating element 1511 on the assembled barrel 11. The two semi-annular sleeves can be directly wrapped around the barrel 11 before connection, without disassembling the entire screw 12 and barrel 11, greatly simplifying the assembly and maintenance process and facilitating on-site construction and subsequent maintenance. The splicing point of the two semi-annular sleeves forms a second air inlet 1517 and a second air outlet 1518.

[0025] like Figure 3 As shown, to match the split heating element 1511, the housing 1512 is formed by splicing multiple covers, and the split housing 1512 is also easy to install and disassemble. In practical applications, regardless of whether the heating element 1511 is a spliced ​​structure, it can effectively maintain the integrity and sealing of the heat dissipation air duct, ensuring that the cooling effect is not affected by the structural form.

[0026] like Figure 3 and Figure 4 As shown, the fan cooling unit 152 includes a fan body 1521 and an air guide shroud 1522. The air outlet of the fan body 1521 is located inside the air guide shroud 1522, and the air outlet of the air guide shroud 1522 is connected to the first air inlet 1513. By directly connecting the air outlet of the air guide shroud 1522 to the air inlet of the casing 1512, leakage of cooling air at multiple interfaces can be effectively avoided, further improving the efficiency of air cooling and energy utilization.

[0027] like Figure 4 As shown, the cover 1512 and the air guide cover 1522 are detachably connected to facilitate daily maintenance, cleaning and parts replacement of the equipment, which significantly reduces maintenance difficulty and time cost.

[0028] Example 2 like Figure 6 As shown, this embodiment provides a multilayer co-extruded film device, including multiple extruders 1 as in Embodiment 1 and a multi-combination mold 2. The multiple extruders 1 are arranged in a fan shape in space. Each extruder 1 is independently responsible for plasticizing and extruding a plastic melt of a specific material or color. The discharge ends of all extruders 1 are oriented towards and connected to the inlet of the multi-combination mold 2.

[0029] Because the screw 12 in the extruder 1 of the multilayer co-extrusion film equipment has a larger length-to-diameter ratio, the material between the screw 12 and the barrel 11 is plasticized more fully and uniformly. Under the same conditions, a less powerful drive unit 14 can be used, thereby reducing energy consumption. At the same time, the air-cooling method used in the temperature control unit 15 makes the cooling method more gentle, which can significantly reduce the frequent start-up and shutdown of the system due to drastic temperature fluctuations, thereby further reducing energy consumption, reducing equipment wear and damage caused by thermal fatigue, and extending equipment life.

[0030] In the description of this utility model, it should be understood that 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 indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0031] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," 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 communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0032] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0033] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0034] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An extruder for multilayer co-extruded films, characterized in that, The extruder (1) includes a barrel (11), a screw (12), a hopper (13), a drive unit (14), and multiple temperature control units (15). The hopper (13) is connected to the input end of the barrel (11), the screw (12) is coaxially arranged inside the barrel (11), the driving device (14) drives the screw (12) to rotate, and the length-to-diameter ratio of the screw (12) is 25-30:1; Multiple temperature control units (15) are arranged sequentially along the axial direction of the barrel (11); Each of the temperature regulating units (15) includes a heating unit (151) and a fan cooling unit (152); the heating unit (151) is sleeved on the outer periphery of the barrel (11) and is used to heat the barrel (11); the fan cooling unit (152) is connected to the heating unit (151) to dissipate heat from the heating unit (151); The heating unit (151) includes a heating element (1511) and a cover (1512) covering the heating element (1511); the heating element (1511) is sleeved on the outer periphery of the barrel (11) and the inner wall of the heating element (1511) is in contact with the outer wall of the barrel (11) to heat the barrel (11); The outer wall of the heating element (1511) and the cover (1512) enclose each other to form a heat dissipation duct. The cover (1512) is provided with a first air inlet (1513) and a first air outlet (1514) that communicate with the heat dissipation duct. The air outlet of the fan cooling unit (152) is connected to the first air inlet (1513) to provide cooling air to the cooling duct.

2. The extruder for multilayer co-extruded films as described in claim 1, characterized in that: The inner wall of the heating element (1511) has multiple heat dissipation grooves (1516) that are spaced apart along its circumference. The heating element (1511) has a second air inlet (1517) and a second air outlet (1518) that are connected to the heat dissipation groove (1516) on its wall surface. The two ends of the heat dissipation groove (1516) are respectively connected to the second air inlet (1517) and the second air outlet (1518); The second air inlet (1517), the heat dissipation groove (1516), and the second air outlet (1518) together form an auxiliary heat dissipation channel.

3. The extruder for multilayer co-extruded films as described in claim 2, characterized in that: The first air inlet (1513) is opposite to the second air inlet (1517), and the first air outlet (1514) is opposite to the second air outlet (1518).

4. The extruder for multilayer co-extruded films as described in claim 1, characterized in that: The fan heat dissipation unit (152) includes a fan body (1521) and an air guide shroud (1522). The air outlet of the fan body (1521) is located inside the air guide shroud (1522), and the air outlet of the air guide shroud (1522) is connected to the first air inlet (1513).

5. The extruder for multilayer co-extruded films as described in claim 4, characterized in that: The cover (1512) and the air guide cover (1522) are detachably connected.

6. The extruder for multilayer co-extruded films as described in claim 2, characterized in that: The heating element (1511) is formed by splicing two semi-annular sleeves, and the two semi-annular sleeves are detachably connected. The joint between the two semi-annular sleeves forms the second air inlet (1517) and the second air outlet (1518).

7. The extruder for multilayer co-extruded films as described in claim 6, characterized in that: The cover (1512) is formed by splicing together multiple spliced ​​covers.

8. An apparatus for multilayer co-extrusion films, characterized in that, The extruder (1) as described in any one of claims 1-7 and a multi-part die (2) are included. The discharge ends of the plurality of extruders (1) are connected to the inlet of the multi-die (2).

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