Online modification combined extrusion equipment and extrusion method thereof

Abstract

The invention provides online modified combined extrusion equipment and an extrusion method thereof, and relates to the technical field of modified extrusion equipment and processes. The online modified combined extrusion equipment comprises a first extrusion system, a second extrusion system, a melt transfer device and a rolling system, the melt transfer device is provided with a liquid inlet end and a liquid outlet end, the liquid inlet end is connected with the underwater pelletizing device of the first extrusion system, and the liquid outlet end is connected with the second extrusion system and used for transferring part of melt of the first extrusion system to the second extrusion system; the second extrusion system comprises a double-screw extrusion device, a die head mounted at the injection end of the double-screw extrusion device, and at least one modifier liquid injection device connected with the double-screw extrusion device; the double-screw extrusion device is provided with at least one group of modifier receiving and mixing sections, each modifier receiving and mixing section comprises a liquid injection barrel and a tooth-shaped disc double-screw, and the tooth-shaped disc double-screw is positioned in an accommodating space of the liquid injection barrel.

Description

Technical Field

[0001] This application generally relates to the field of extruder equipment, and in particular to a modified extrusion equipment and process. Background Art

[0002] After the synthesis of polymer materials, due to the presence of a large amount of solvents or impurities, they need to be subjected to treatments such as devolatilization and impurity removal before pelletizing, and stored in solid form for later use. The extrusion pelletizing process is a common method in the field of polymer materials. The polymer materials after being fully stirred and mixed are added into the hopper of the extruder. There is a heater outside the barrel of the extruder, and the materials in the barrel are heated to the melting temperature through heat conduction. The machine runs, and the screw in the barrel transports the materials forward. During the movement of the materials, there is mutual friction and shearing between the materials and the barrel, the screw, and between the materials themselves, generating a large amount of heat. The heat and the heat conduction effect continuously melt the added materials. The molten materials are continuously and stably transported into a head (or die) with a certain shape. After passing through the die, the materials in a flowing state take an approximate die shape, and then enter the cooling and shaping device to solidify the materials while maintaining the established shape. Then, the extruded and formed materials are input into a pelletizer to cut the round strip-shaped plastics into particles. Finally, the plastic particles are weighed and bagged for injection molding use.

[0003] With the increasing variety of composite requirements for polymer materials, in the actual production of final products, various modification treatments need to be carried out on polymer materials. However, due to equipment limitations, it is difficult to complete the modification treatment before pelletizing. In addition, in the actual production of final products, it is also necessary to make the corresponding shape of the product. For example, the modified EVA film used for solar panels has a final product in the form of a film. In the prior art, the pelletized polymer materials are melted in a screw extruder, modified with a modifier, and then pelletized to form modified particles. The modified particles are then formed into a film through a melting device or a coating and / or laminating device. In some actual industrial production practices, EVA and a peroxide modifier are also mixed onto a hard carrier such as a glass sheet, and then placed in a hot pressing device for modified cross-linking reaction and pressing into a film. These methods are difficult to complete continuously, resulting in losses of materials, time, etc. Summary of the Invention

[0004] In view of one or more of the problems existing in the prior art, this application provides an on-line modification combined extrusion equipment, including: a first extrusion system, a second extrusion system, a melt transfer device, and a roll pressing system; The melt transfer device has an inlet end and an outlet end. The inlet end is connected to the first extrusion system, and the outlet end is connected to the second extrusion system, and is used to transfer part of the melt of the first extrusion system to the second extrusion system; The second extrusion system includes a twin-screw extrusion device, a die head installed at the injection end of the twin-screw extrusion device, and at least one modifier injection device connected to the twin-screw extrusion device; at least one set of modifier receiving and mixing sections is provided on the twin-screw extrusion device, and the modifier receiving and mixing section includes an injection cylinder and a toothed disk twin-screw, and the toothed disk twin-screw is located in the accommodation space of the injection cylinder; wherein, the injection cylinder has at least one injection pipe, and the modifier injection device is connected to the injection pipe; the modifier receiving and mixing section is located downstream along the direction of melt travel. The roll pressing system includes at least one set of press roller cross-linking components and a winding device. Wherein, the die head is adapted to the press roller cross-linking components for ejecting film / sheet materials onto the press roller cross-linking components.

[0005] The synthesized polymer material melt enters the first extrusion system to complete traditional corresponding processing processes (such as: devolatilization, cooling, pressure building, etc.), and a part of the melt is transferred to the second extrusion system through a melt transfer device. After entering the second extrusion system, the melt enters the twin-screw extrusion device, and under the rotation of the twin-screws, the melt moves towards the die head. When flowing through the modifier receiving and mixing section, it is mixed with the modifier from the modifier injection device and undergoes strong shear dispersion. The modifier in the modifier injection device is transported to the toothed disk twin-screw through the injection pipe, and the toothed disk twin-screw plays a role in shear dispersion.

[0006] The melt mixed with the modifier enters the die head, undergoes an incomplete cross-linking reaction under the action of the die head and is extruded into a gel film (film / sheet material). The gel film first passes through the press roller cross-linking components, then completes all cross-linking reactions and forms a gel film product with the required thickness, width, etc., and then enters the winding mechanism for winding.

[0007] Further, the first extrusion system includes a screw pressure building section, a first gear pump, and an underwater pelletizing device. The screw pressure building section, the first gear pump, and the underwater pelletizing device are connected in sequence, and the liquid inlet end of the melt transfer device is connected to the pipeline between the first gear pump and the underwater pelletizing device.

[0008] Further, the first extrusion system further includes a first discharge valve, which is arranged between the first gear valve and the underwater pelletizing device for discharging the detected unqualified melt from the first extrusion system; and / or, The first extrusion system further includes a screen changer, which is arranged between the first gear and the underwater pelletizing device for filtering cross-linked material blocks or carbonized material blocks in the melt; The liquid inlet end of the melt transfer device is arranged upstream of the underwater pelletizing device along the direction of melt travel and is close to the underwater pelletizing device.

[0009] Further, a first discharge valve and a screen changer are sequentially arranged between the first gear pump and the underwater pelletizing device along the melt traveling direction, wherein the liquid inlet end of the melt transfer device is connected to the pipeline between the screen changer and the underwater pelletizing device.

[0010] Further, the melt transfer device includes a melt pipe, a buffer hopper, and a second gear pump, which are sequentially connected; wherein, a control valve and a second discharge valve are arranged on the melt pipe, and the gear pump is arranged between the buffer hopper and the twin-screw extrusion device.

[0011] When the control valve is opened, part of the melt from the first extrusion system enters the melt pipe and then flows into the buffer hopper, and is injected into the second extrusion system under the pressure of the second gear pump. Among them, the second discharge valve is similar to the first discharge valve in function, and is used to detect unqualified materials (such as degraded and yellowed unqualified materials) caused by oxidation in the melt pipe, and discharge these unqualified materials from the melt pipe. The buffer hopper is used to maintain the stability of melt supply. The control valve controls the melt flow rate and is associated with the liquid level of the buffer hopper. When the liquid level is low, the valve opening increases, and when the liquid level is high, the valve opening decreases, to avoid the melt staying in the buffer hopper for too long.

[0012] Further, the melt pipe and the buffer hopper are both provided with jacket heat preservation devices to keep the fluidity of the melt.

[0013] Further, the modifier receiving and mixing section is arranged close to the die head position.

[0014] Further, the liquid injection barrel section includes a barrel and a connecting flange structural member. The barrel is arranged to have a cylindrical barrel head adapted to the connecting flange. At least one liquid injection pipe is arranged on the side wall of the cylindrical barrel head. The connecting flange is arranged to have a channel adapted to the liquid injection pipe for the liquid injection pipe to extend outside the twin-screw extrusion device through the connecting flange.

[0015] Further, four liquid injection pipes are arranged on the side wall of the cylindrical barrel head, and four channels are provided on the side wall of the connecting flange assembly in a matching manner.

[0016] Further, the pressure roller crosslinking assembly includes a front section pressure roller assembly and a rear section pressure roller assembly; Among them, the front section pressure roller assembly is used to receive the film / sheet material ejected from the die head and heat and roll it to complete the crosslinking reaction of the film / sheet material; the rear section pressure roller is used to cool the film / sheet material that has completed the crosslinking reaction.

[0017] Further, the front section pressure roller assembly includes three groups of pressure rollers, and the three groups of pressure rollers are sequentially arranged along the moving direction of the film / sheet material.

[0018] The present application also provides an online modification combined extrusion method, which uses the above-described equipment and includes: S1. The melt enters the first extrusion system. Before granulation after pressure boosting treatment, a part of the melt is transferred to the second extrusion system through a melt transfer device, and the melt that is not transferred in the first extrusion system is extruded and granulated. S2. The melt in the second extrusion system is mixed with the modifier from the modifier injection device in the modifier receiving and mixing section of the twin-screw extrusion device, and after being mixed and dispersed by the toothed disk twin-screw, it is ejected through the die head into a film / sheet material onto the roll press cross-linking assembly. S3. The film / sheet material is subjected to roll press heating treatment through the roll press cross-linking assembly to complete the cross-linking reaction, and then subjected to roll press cooling treatment, and finally wound up after forming a modified adhesive film.

[0019] In S1, the method of the pressure boosting treatment is: the melt pressure is raised to 10-15 Mpa through the screw pressure building section, and then raised to more than 20 Mpa through the first gear pump. The pressure drops to 5-10 Mpa before the melt enters the underwater pelletizing device.

[0020] S2 includes: S2-1: The melt in the twin-screw extrusion maintains the melt temperature below the cross-linking temperature, and the modifier and the melt are dispersed evenly by the toothed disk twin-screw. S2-2: The melt mixed evenly with the modifier enters the die head and completes part of the cross-linking reaction, and is extruded and formed through the die head into a film / sheet material.

[0021] Preferably, in S3, the heating temperature of the roll press heating treatment is within the cross-linking reaction temperature range of the film / sheet material. The film / sheet material ejected from the die head completes all cross-linking reactions during the heating and roll pressing process to obtain a modified adhesive film.

[0022] Through the design of the melt transfer device and the design of the second extrusion system on the traditional extrusion granulation equipment, the present application cleverly realizes the simultaneous and synchronous preparation of granular materials and modified adhesive films, effectively saving the process flow and production costs, and ensuring the product quality of the simultaneously prepared polymer particles and modified adhesive films. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings are used to provide a further understanding of the present application, and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application, and do not constitute a limitation to the present application. In the drawings: Figure 1 is a schematic structural diagram of an online modification combined extrusion device according to an embodiment of the present application; Figure 2 is a schematic structural diagram of an online modification combined extrusion device according to an embodiment of the present application; Figure 3 Schematic diagram of the structure of a partial (second extrusion system and roll pressing system) of an on-line modification combined extrusion device according to an embodiment of the present application; Figure 4 is Figure 3 partial enlarged view of A in Figure 5 Stereo exploded view of the liquid injection cylinder section in the on-line modification combined extrusion device according to an embodiment of the present application; Figure 6 Cross-sectional view of the liquid injection cylinder section in the on-line modification combined extrusion device according to an embodiment of the present application at the installation position of the liquid injection pipe; Wherein, 1: first extrusion system, 2: second extrusion system, 3: melt transfer device, 4: roll pressing system, 11: screw pressure building section, 12: first gear pump, 13: underwater pelletizing device, 14: first discharge valve, 15: screen changer, 21: twin-screw extrusion device, 22: die head, 23: modifier liquid injection device, 21-1: cylinder, 21-2: twin-screw, 210: modifier receiving and mixing section, 210-1: liquid injection cylinder, 210-2: toothed disk twin-screw, 210-11: barrel, 210-12: connecting flange, 210-110: cylindrical barrel head, 213: accommodation space, 214: liquid injection pipe, 215: channel, 31: liquid inlet end, 32: liquid outlet end, 33: melt pipe, 34: buffer hopper, 35: second gear pump, 331: control valve, 332: second discharge valve, 41: roll pressing and crosslinking assembly, 42: winding device, 43: thickness measuring device, 44: cutting device, 411: front section roll pressing assembly, 412: rear section roll pressing assembly. Detailed implementation manners

[0024] In the following, only some exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present application. Therefore, the drawings and the description are considered to be exemplary in nature rather than restrictive.

[0025] In the description of the present application, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless otherwise specifically defined.

[0026] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, an electrical connection or a connection capable of mutual communication; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0027] In the present application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0028] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. To simplify the disclosure of the present application, components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present application. In addition, the present application may repeat reference numerals and / or reference letters in different examples. This repetition is for the purpose of simplification and clarity and does not itself indicate the relationship between various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0029] The preferred embodiments of the present application are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only for the purpose of illustrating and explaining the present application and are not used to limit the present application.

[0030] Embodiment 1: As Figure 1-2 shown, the first embodiment of the present application provides an on-line modification combined extrusion device, which can realize the process of on-line modification of part of the polymer material and extrusion molding into a film while granulating the polymer material. Different products in granular and film forms are obtained simultaneously.

[0031] The device includes four major parts, namely: the first extrusion system 1, the second extrusion system 2, the melt transfer device 3, and the roll pressing system 4. The first extrusion system 1 can complete the traditional extrusion granulation process to obtain granular polymer materials. The melt transfer device 3 can transfer part of the melt in the first extrusion system 1 to the second extrusion system 2. The second extrusion system 2 is used to complete the chemical modification process of polymer materials, etc. After extruding and forming cross-linked film / sheet materials, they are further roll-pressed by the roll pressing system 4 to obtain film products.

[0032] The specific structure of each part is described in detail below.

[0033] The first extrusion system 1 As Figure 1As shown in the figure, the first extrusion system 1 includes a screw pressure building section 11, a first gear pump 12, and an underwater pelletizing device 13. The screw pressure building section 11, the first gear pump 12, and the underwater pelletizing device 13 are connected in sequence. Taking ethylene-vinyl acetate copolymer (EVA) as an example, the EVA material after the reaction synthesis is sent to the screw pressure building section 11 of the first extrusion system 1 through a feeding device. The structure of the screw pressure building section 11 is a traditional extrusion device with a barrel and a screw in cooperation, and functional devices such as devolatilization can be added according to the process purpose of the material to be processed. However, in this application, the main function of the screw pressure building section 11 is to build pressure, that is, to raise the pressure in the barrel to a preset pressure to prepare for the on-line modification for the purpose of this application. In order to achieve the purpose of on-line modification of this application, the screw pressure building section 1 can raise the melt pressure to 10-15 Mpa. Driven by such a purpose, those skilled in the art can achieve it by adjusting parameters such as the length of the screw pressure building section 11. The screw pressure building section 11 can use a single screw or a twin screw. For the pressure building of EVA, a single screw is generally sufficient. The first gear pump 12 can instantaneously increase the pressure of the melt. The cooperation of the screw pressure building section 11 and the first gear pump 12 lays a foundation for the subsequent melt transfer and on-line modification. The untransferred EVA melt enters the underwater pelletizing device 13 for pelletizing. The underwater pelletizing device is existing in the art and will not be described in detail here.

[0034] As Figure 2 shown, a preferred embodiment is presented. In the first extrusion system 1, a first discharge valve 14 and a screen changer 15 can be selectively installed, which are arranged between the first gear valve 12 and the underwater pelletizing device 13. The first discharge valve 14 has a three-way valve structure, one end is connected to the first gear pump 12, one end is connected to the underwater cutting device 13 (when there is no screen changer 15) or the screen changer 15, and the other end, also called the grounding end, is used to discharge unqualified melt materials. In actual production, occasionally some degraded materials or yellow materials are formed. At this time, in order to ensure product quality, the first discharge valve 14 can be installed or enabled. The screen changer 15 is arranged between the first gear 12 (when there is no first discharge valve 14) or the first discharge valve 14 and the underwater pelletizing device 13, and is used to filter macromolecular materials such as cross-linked materials or carbonized materials in the melt.

[0035] The second extrusion system 2 As Figure 1-4 shown, the second extrusion system 2 includes a twin-screw extrusion device 21, a die head 22 installed at the injection end of the twin-screw extrusion device, and at least one modifier injection device 23 connected to the twin-screw extrusion device 21. The twin-screw extrusion device 21 includes a barrel 21-1 and a twin screw 21-2, and the twin screw can rotate in the barrel. The twin-screw extrusion device 21 has at least one set of modifier receiving and mixing sections 210.

[0036] See Figure 1 、 5 As shown in FIGS. 6, the modifier receiving and mixing section 210 is located downstream along the melt traveling direction, and includes a liquid injection cylinder 210-1 and a toothed disk twin screw 210-2. The toothed disk twin screw 210-2 is located in the accommodation space 213 of the liquid injection cylinder 210-1. The liquid injection cylinder 210-1 has at least one liquid injection pipe 214. The modifier injection device 23 is connected to the liquid injection pipe 214. The toothed disk structure design of the toothed disk twin screw 210-2 plays a role in strong shear dispersion. The modifier in the modifier injection device 23 enters the liquid injection cylinder 210-1 through the liquid injection pipe 214. At this time, the toothed disk twin screw 210-2 quickly completes the dispersion and mixing of the melt of the modified extrusion line (i.e., the second extrusion system 2) and the injected modifier in the modifier receiving and mixing section 210. These mixed materials enter the die head 22 to complete part of the cross-linking reaction, and the film / sheet-shaped adhesive film is formed and extruded from the die head. The modifier receiving and mixing section 210 is arranged close to the die head. The melt added with the modifier (such as EVA) is likely to start the cross-linking reaction, resulting in an increase in viscosity or adhesion to the screw or the inner wall of the barrel, causing the operation of the twin screw extrusion device 21 to be blocked. Arranging the modifier receiving and mixing section 210 close to the die head 22 ensures that the mixed and dispersed materials quickly enter the die head 22.

[0037] Such as Figure 5 、 6 As shown in FIGS., the liquid injection cylinder section 210-1 includes a barrel 210-11 and a connecting flange 210-12. The barrel 210-11 is provided with a cylindrical barrel head 210-110 adapted to the connecting flange 210-12. Four liquid injection pipes 214 are arranged on the side wall of the cylindrical barrel head 210-110. As a preferred embodiment of the present application, the connecting flange assembly 210-12 is provided with four channels 215 adapted to the liquid injection pipes 214 for the liquid injection pipes 214 to extend outside the twin screw extrusion device 21 through the connecting flange 210-12. The four liquid injection pipes 214 are evenly distributed around the barrel 210-11, and the modifier can be injected into the toothed disk screw section 210-2 simultaneously from four directions. On the one hand, it is beneficial to quickly disperse, increase the mixing uniformity speed of the modifier and the melt, and reduce the residence time of the mixed material of the modifier and the melt on the twin screw extrusion device 21. On the other hand, it reduces the possibility of local cross-linking of the modifier and the melt before being evenly dispersed.

[0038] Melt transfer device 3 The melt transfer device 3 has an inlet end 31 and an outlet end 32. The inlet end 31 is connected to the first extrusion system 1, and the outlet end 32 is connected to the second extrusion system 2, for transferring part of the melt of the first extrusion system 1 to the second extrusion system 2.

[0039] The liquid inlet end 31 is connected to the pipeline between the first gear pump 12 and the underwater pelletizing device 13. If the first extrusion system is also provided with a first discharge valve 14 and / or a screen changer 15, the liquid inlet end 31 is arranged after the first discharge valve 14 and / or the screen changer 15 and before the underwater pelletizing device 13. After the action of the first gear pump 12, the pressure of the melt reaches the highest point. The process from the first gear pump 12 to the underwater pelletizing device 13 is a pressure reduction process. Before reaching the underwater pelletizing device 13, the pressure can be reduced to 5 - 10 Mpa. At this time, in the process of such pressure reduction of the original extrusion line (the first extrusion system 1), part of the melt is diverted. On the one hand, it can ensure the fluidity and speed of the melt diversion, and also ensure the minimum interference to the melt flow of the original extrusion line (the first extrusion system 1), making the extrusion granulation more smooth and stable.

[0040] The melt transfer device 3 includes a melt pipe 33, a buffer hopper 34, and a second gear pump 35, and the melt pipe 33, the buffer hopper 34, and the second gear pump 35 are connected in sequence. The liquid inlet end 31 is arranged on the melt pipe 33 and is connected to the first extrusion system 1. The liquid outlet end 32 is the liquid outlet of the second gear pump 35 and is connected to the upstream of the twin-screw extrusion device 21 of the modified extrusion line (the second extrusion system 2).

[0041] A control valve 331 and a second discharge valve 332 are provided on the melt pipe 33. When the control valve 331 is opened, part of the melt of the first extrusion system enters the melt pipe 33 and then flows into the buffer hopper 34, and is injected into the second extrusion system 2 under the pressure of the second gear pump 35. The second gear pump 35 can also control the flow rate of the melt at the same time. Among them, the second discharge valve 332 is similar in function to the first discharge valve 14, and is used to detect unqualified materials (such as degraded and yellowed unqualified materials) caused by oxidation in the melt pipe 33, and discharge these unqualified materials from the melt pipe 33. The buffer hopper 34 is used to maintain the stability of the melt supply. The control valve 331 controls the melt flow rate and is associated with the liquid level of the buffer hopper 34. When the liquid level is low, the valve opening increases, and when the liquid level is high, the valve opening decreases, so as to avoid the melt staying in the buffer hopper 34 for too long.

[0042] As a more optimal embodiment, the melt pipe 33 and the buffer hopper 34 are both provided with jacket heat preservation devices to maintain the fluidity of the melt.

[0043] Rolling system 4 Such as Figure 3 、 4 As shown, the rolling system 4 includes at least one set of pressure roller crosslinking components 41 and a winding device 42. The die head 22 is adapted to the pressure roller crosslinking components 41 and is used to spray out film / sheet materials onto the pressure roller crosslinking components 41.

[0044] The pressure roller crosslinking assembly 41 includes a front-section pressure roller assembly 411 and a rear-section pressure roller assembly 412. Among them, the front-section pressure roller assembly 411 is used to receive the film / sheet material ejected from the die head and heat and roll it to complete the crosslinking reaction of the film / sheet material. The rear-section pressure roller assembly 412 is used to cool the film / sheet material that has completed the crosslinking reaction. As a preferred embodiment of the present application, the front-section pressure roller assembly 411 includes three groups of pressure rollers, and the three groups of pressure rollers are arranged in sequence along the moving direction of the film / sheet material (adhesive film). The advantage of this is that the crosslinking reaction of the adhesive film can be more fully completed, and the film thickness can be accurately controlled. The rear-section pressure roller assembly 412 can also be additionally provided with a thickness measuring device 43. After being cooled by the rear-section pressure roller assembly 412, the adhesive film enters the winding device 42. In order to obtain a neater product, a cutting device 44 can be provided before winding to cut the sides of the adhesive film more neatly.

[0045] The melt of the synthesized polymer material enters the first extrusion system 1 to complete the traditional corresponding treatment processes (such as: devolatilization, cooling, pressure building, etc.). Part of the melt is transferred to the second extrusion system 2 through the melt transfer device 3. After entering the second extrusion system 2, the melt enters the twin-screw extrusion device 21. Under the rotation of the twin screws, the melt moves towards the die head. When flowing through the modifier receiving and mixing section 210, it is mixed with the modifier from the modifier injection device 23 and undergoes strong shear dispersion. The modifier in the modifier injection device 23 is transported to the toothed disk twin-screw section through the injection pipe 214, and the toothed disk twin-screw section plays a role in shear dispersion. The melt mixed with the modifier enters the die head, and undergoes an incomplete crosslinking reaction under the action of the die head and is extruded into an adhesive film (film / sheet material). The adhesive film first passes through the pressure roller crosslinking assembly 41, then completes all crosslinking reactions and forms an adhesive film product with the required thickness, width, etc., and then enters the winding mechanism for winding.

[0046] Embodiment 2: This embodiment proposes an on-line modification method, which is applicable to on-line chemical modification during extrusion granulation. Specifically as follows: A combined extrusion method for granulation and film formation based on on-line chemical modification, using the above-mentioned equipment, includes: S1, after the melt enters the first extrusion system and undergoes pressure boosting treatment and before granulation, part of the melt is transferred to the second extrusion system through the melt transfer device, and part of the melt is extruded into granules; S2, in the second extrusion system, part of the melt and the modifier from the modifier injection device are mixed and dispersed by the toothed disk twin-screw in the modifier receiving and mixing section of the twin-screw extrusion device, and then the film / sheet material is ejected through the die head onto the pressure roller crosslinking assembly; S3, the film / sheet material undergoes crosslinking reaction after being roll-pressed and heated by the pressure roller crosslinking assembly, and then undergoes roll-pressed cooling treatment, and finally forms a modified adhesive film and is wound up.

[0047] Among them, the proportion of the part of the melt transferred to the second extrusion system accounts for 5wt%-10wt% of the melt entering the first system.

[0048] In S1, the pressure is increased as follows: first, the melt pressure is increased to 10-15 Mpa through the pressure-building section of the screw, and then to above 20 Mpa through the gear pump. Before the melt enters the underwater pelletizing device, the pressure drops to 5-10 Mpa.

[0049] S2 includes: S2-1: The melt is maintained at the crosslinking temperature in the twin-screw extruder, and the modifier is evenly dispersed with the melt through the toothed disk twin-screw. S2-2: The melt mixed evenly with the modifier enters the die head and completes partial crosslinking reaction, and is extruded and formed through the die head to eject film / sheet materials.

[0050] In S3, the heating temperature of the roll pressing and heating treatment is within the crosslinking reaction temperature range of the film / sheet material. The film / sheet material ejected from the die head completes the entire crosslinking reaction during the heating and roll pressing process to obtain a modified adhesive film.

[0051] Finally, it should be noted that the above are only the preferred embodiments of the present application and are not used to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. An on-line modification combined extrusion device, characterized in that, Comprising: A first extrusion system, a second extrusion system, a melt transfer device, and a roll pressing system; The melt transfer device has an inlet end and an outlet end. The inlet end is connected to the underwater pelletizing device of the first extrusion system, and the outlet end is connected to the second extrusion system, for transferring part of the melt of the first extrusion system to the second extrusion system; The second extrusion system includes a twin-screw extrusion device, a die head installed at the injection end of the twin-screw extrusion device, and at least one modifier injection device connected to the twin-screw extrusion device; there is at least one set of modifier receiving and mixing sections on the twin-screw extrusion device. The modifier receiving and mixing section includes an injection cylinder and a toothed disk twin-screw. The toothed disk twin-screw is located in the accommodation space of the injection cylinder; wherein, the injection cylinder has at least one injection pipe, and the modifier injection device is connected to the injection pipe; the modifier receiving and mixing section is arranged downstream along the melt traveling direction; The roll pressing system includes at least one set of press roll crosslinking components and a winding device; Wherein, the die head is adapted to the press roll crosslinking components, for spraying out film / sheet materials onto the press roll crosslinking components.

2. The online modification combined extrusion equipment according to claim 1, wherein, The first extrusion system includes a screw pressure building section, a first gear pump, and an underwater pelletizing device. The screw pressure building section, the first gear pump, and the underwater pelletizing device are connected in sequence. The inlet end of the melt transfer device is connected to the pipeline between the first gear pump and the underwater pelletizing device.

3. The online modification combined extrusion equipment according to claim 2, characterized in that, The first extrusion system further includes a first discharge valve, which is arranged between the first gear pump and the underwater pelletizing device, for discharging the detected unqualified melt from the first extrusion system; and / or, The first extrusion system further includes a screen changer, which is arranged between the first gear pump and the underwater pelletizing device, for filtering crosslinked material blocks or carbonized material blocks in the melt; The inlet end of the melt transfer device is arranged upstream of the underwater pelletizing device along the melt traveling direction and is close to the underwater pelletizing device.

4. The on-line modification combined extrusion equipment according to claim 3, characterized in that, A first discharge valve and a screen changer are arranged in sequence between the first gear pump and the underwater pelletizing device along the melt traveling direction. Among them, the inlet end of the melt transfer device is arranged between the screen changer and the underwater pelletizing device.

5. The on-line modification combined extrusion equipment according to claim 1, characterized in that The melt transfer device includes a melt pipe, a buffer hopper, and a second gear pump. The melt pipe, the buffer hopper, and the second gear pump are connected in sequence; wherein, a control valve and a second discharge valve are arranged on the melt pipe, and the second gear pump is arranged between the buffer hopper and the twin-screw extrusion device.

6. The on-line modification combined extrusion equipment according to claim 5, characterized in that, Both the melt pipe and the buffer hopper are provided with jacket heat preservation devices.

7. The online modification combined extrusion equipment according to claim 1, characterized in that, The modifier receiving and mixing section is arranged close to the die head position.

8. The online modification combined extrusion equipment according to claim 1, characterized in that The injection cylinder includes a cylinder barrel and a connecting flange. The cylinder barrel is arranged to have a cylindrical barrel head adapted to the connecting flange. At least one injection pipe is arranged on the side wall of the cylindrical barrel head. The connecting flange is arranged to have a channel adapted to the injection pipe, for the injection pipe to extend out of the connecting flange to the outside of the twin-screw extrusion device.

9. The on-line modification combined extrusion equipment according to claim 8, characterized in that Four injection pipes are arranged on the side wall of the cylindrical barrel head, and four channels adapted thereto are provided on the side wall of the connecting flange.

10. The online modification combined extrusion equipment according to claim 1, characterized in that, The press roller crosslinking assembly includes a front-section press roller assembly and a rear-section press roller assembly; Among them, the front-section press roller assembly is used to receive the film / sheet material ejected from the die head and heat and roll it to complete the crosslinking reaction of the film / sheet material; the rear-section press roller assembly is used to cool the film / sheet material that has completed the crosslinking reaction.

11. The on-line modification combined extrusion equipment according to claim 10, characterized in that, The front-section press roller assembly includes three groups of press rollers, and the three groups of press rollers are arranged in sequence along the moving direction of the film / sheet material.

12. An online modification combined extrusion method, characterized in that, Using the equipment described in any one of claims 1-11, including: S1, the melt enters the first extrusion system. Before granulation after pressure boosting treatment, part of the melt is transferred to the second extrusion system through the melt transfer device, and the melt that is not transferred in the first extrusion system is extruded and granulated; S2, the melt in the second extrusion system is mixed with the modifier from the modifier injection device in the modifier receiving and mixing section of the twin-screw extrusion device, and after being dispersed and mixed by the toothed disk twin-screw, the film / sheet material is ejected through the die head onto the press roller crosslinking assembly; S3, the film / sheet material is subjected to roll pressing and heating treatment through the press roller crosslinking assembly to complete the crosslinking reaction, and then subjected to roll pressing and cooling treatment, and finally a modified adhesive film is formed and wound up.

13. The method according to claim 12, wherein The part of the melt transferred to the second extrusion system accounts for 5wt%-10wt% of the total amount of the melt entering the first system.

14. The method according to claim 12, wherein In S1, the method of the pressure boosting treatment is: the melt pressure is increased to 10-15 Mpa through the screw pressure building section, and then increased to more than 20 Mpa through the first gear pump.

15. The method according to claim 12, wherein Before the melt enters the underwater pelletizing device, the pressure drops to 5-10 Mpa.

16. The method according to claim 12, wherein S2 includes: S2-1: The melt in the twin-screw extrusion maintains the melt temperature below the crosslinking temperature, and the modifier and the melt are dispersed evenly by the toothed disk twin-screw; S2-2: The melt mixed evenly with the modifier enters the die head and completes part of the crosslinking reaction, and the film / sheet material is extruded and formed through the die head.

17. The method according to claim 12, wherein In S3, the heating temperature of the roll pressing and heating treatment is within the crosslinking reaction temperature range of the film / sheet material. The film / sheet material ejected from the die head completes all crosslinking reactions during the heating and roll pressing process to obtain a modified adhesive film.

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