Three-layer co-extrusion film blowing machine for blowing film by using plastic

Abstract

The invention relates to the field of plastic recycling and reusing, and discloses a three-layer co-extrusion film blowing machine for blowing a film by using plastic, the three-layer co-extrusion film blowing machine comprises a co-extrusion die head, a film drawing assembly and an output component, the film drawing assembly comprises a sealing shell, a telescopic rod is arranged on the upper surface of the sealing shell, and the upper end of the telescopic rod penetrates through the co-extrusion die head and then is provided with an air outlet head; a plurality of air outlet holes are formed in the side face and the upper surface of the air outlet head in an array mode, a rotating shaft is rotationally installed in the sealing shell, a coil spring is arranged at the installation position, a wire spool is arranged outside the rotating shaft, a connecting groove is formed in one end of the rotating shaft, a hose is arranged in the telescopic rod, and a fixing step is arranged at one end of the hose and connected with the upper end of the telescopic rod. The other end of the hose bypasses the wire spool and then is connected with a rotating shaft, a fixing hole used for communicating the connecting groove with the hose is formed in the rotating shaft, a first connecting nozzle and a second connecting nozzle are arranged on the outer circle face of the sealing shell, and the tail ends of the first connecting nozzle and the second connecting nozzle are each provided with an air pump.

Description

Technical Field

[0001] This invention relates to the field of plastic recycling and reuse, and specifically to a three-layer co-extrusion blown film machine that utilizes plastic blown film. Background Technology

[0002] A three-layer co-extrusion blown film machine is a high-efficiency device for producing multi-layer composite films, widely used in food packaging, agricultural films, medical packaging, and industrial materials. Its core feature is the simultaneous extrusion of raw materials with different properties (such as PE, PP, PA, EVOH, etc.) through three extruders, forming a multi-layered film structure through a co-extrusion die, combining the advantages of each layer (such as barrier properties, strength, and heat-sealing properties). However, in existing technologies, film stretching is generally done manually, which is labor-intensive. Furthermore, the high temperature of the freshly extruded film poses a significant risk of burns to workers upon contact. Therefore, this invention proposes a three-layer co-extrusion blown film machine that utilizes plastic blown film technology. This machine can automate the blown film process using waste or normal plastics as raw materials, reducing labor intensity and the risk of burns. Summary of the Invention

[0003] To address the problems mentioned in the background above, the present invention provides a three-layer co-extrusion blown film machine utilizing plastic blown film.

[0004] To achieve the above-mentioned technical objectives, the technical solution adopted by the present invention is as follows.

[0005] A three-layer co-extrusion blown film machine utilizing plastic blown film includes a co-extrusion blown film component and an output component. The co-extrusion blown film component includes a co-extrusion die head and a film stretching assembly.

[0006] The film stretching assembly includes a sealing shell, a telescopic rod is provided on the upper surface of the sealing shell, the upper end of the telescopic rod passes through the co-extrusion die and is provided with an air outlet, and a number of air outlet holes are arrayed on the side and upper surface of the air outlet, the lower end of the telescopic rod is connected to the upper surface of the sealing shell, and the upper surface of the sealing shell is provided with a connection hole communicating with the telescopic rod.

[0007] A rotating shaft is rotatably installed inside the sealed housing, and a coil spring is provided at the installation point. A winding disc is provided on the outside of the rotating shaft, and a connecting groove is provided at one end of the rotating shaft.

[0008] The telescopic rod is equipped with a flexible hose. One end of the flexible hose is provided with a fixed step and the fixed step is connected to the upper end of the telescopic rod. The other end of the flexible hose passes around the winding reel and is connected to the rotating shaft. The rotating shaft is provided with a fixed hole for connecting the connecting groove and the flexible hose.

[0009] The outer circular surface of the sealing shell is provided with a first connector and a second connector, and each of the two is provided with an air pump at its end. The end of the rotating shaft with a connecting groove is fitted inside the first connector.

[0010] Furthermore, the telescopic rod consists of several telescopic sections. The telescopic section is hollow inside and has an internal step at the upper end and an external step at the lower end. When the telescopic rod extends, the external step of the upper telescopic section fits into the lower telescopic section. At the same time, the cooperation between the internal step and the external step prevents the two adjacent telescopic sections from separating.

[0011] Furthermore, the co-extrusion die head includes a ring-shaped base with a vertical axis. The upper surface of the base is provided with stepped grooves, which include four grooves, namely groove one, groove two, groove three, and groove four from the outside to the inside. The depth of groove one is less than the depth of groove two, which is less than the depth of groove three, which is less than the depth of groove four. Groove four is open to one side of the base. The outer surface of the base is provided with three side nozzles, which are connected to groove four, groove three, and groove two, respectively. Extruders are provided at the ends of the side nozzles, and three extruders are provided accordingly.

[0012] Furthermore, the co-extrusion die also includes a template, which is a vertically arranged annular shape with an arc-shaped upper surface. The distance between the arc and the template axis decreases from bottom to top.

[0013] There are three templates, namely Template 1, Template 2 and Template 3. Template 1 is set in the first groove and its outer ring surface is in contact with the groove wall of the first groove. Template 2 is set in the second groove and the area between the outer ring surface of Template 2 and the groove wall of the second groove is buffer zone 1. Template 3 is set in the third groove and the area between the outer ring surface of Template 3 and the groove wall of the third groove is buffer zone 2. A core tube is coaxially set on the inner ring surface of the base. The area between the outer ring surface of the core tube and the groove wall of the fourth groove is buffer zone 3.

[0014] Between two adjacent templates, there are gap areas between the inner ring surface of the outer template and the outer ring surface of the inner template, as well as between the innermost template and the core tube. There are a total of three gap areas, which are connected to buffer zone one, buffer zone two and buffer zone three respectively.

[0015] Furthermore, an outer mold base is provided on the upper surface of the base, an inner mold head is provided at the upper end of the core tube, and a telescopic rod passes through the core tube;

[0016] The diameter of the inner ring surface of the outer mold base decreases from bottom to top, then remains constant, and finally increases. The diameter of the outer surface of the inner mold head increases from bottom to top and then decreases.

[0017] The inner ring surface of the outer mold base, the outer surface of the inner mold head, and the arc surfaces of the three templates together form a mixing gap, which is connected to the three gap areas.

[0018] Furthermore, a heating element is provided on the outer surface of the outer mold base.

[0019] Furthermore, an air guide ring is provided on the upper surface of the outer mold base. The air guide ring is hollow inside and has a connector on the outer ring surface. A blower is provided at the end of the connector. The diameter of the inner ring surface increases from bottom to top and has several air blowing holes distributed in an array.

[0020] Furthermore, the output component includes a fixed lower support, a vertically arranged guide rod on the upper surface of the lower support, an upper support slidably mounted on the guide rod, a nut at the upper end of the guide rod, and a spring sleeved on the outside of the guide rod between the nut and the upper support.

[0021] A side support is hinged to one end of the lower support and the upper support, and the two side supports are distributed in a herringbone shape. A conveyor roller one is provided at the other end of the lower support, and a conveyor roller two is provided at the other end of the upper support.

[0022] Each of the lower and upper supports is equipped with a drive assembly, which is used to drive the side support to deflect.

[0023] Furthermore, the two drive components are located on opposite sides of the two side supports. Each drive component includes a connecting rod connected to the upper or lower support. The end of the connecting rod is hinged to a drive element. The output end of the drive element is hinged to the side support. The drive element can cause the distance between the side support and the connecting rod to change.

[0024] Furthermore, a conveying roller three is provided on the hinge shaft formed at the hinge joint between the side support and the lower support, and a conveying roller four is provided on the hinge shaft formed at the hinge joint between the side support and the upper support.

[0025] The lower end of the side support connected to the lower support is provided with a conveying roller five, and the lower end of the side support connected to the upper support is provided with a conveying roller six.

[0026] Conveyor roller 1, conveyor roller 2, conveyor roller 3, conveyor roller 4, conveyor roller 5 and conveyor roller 6 are parallel to each other and are all parallel to the hinge axis between the side support and the upper support. The ends of conveyor roller 1 and conveyor roller 2 are each powered by a motor.

[0027] The output components also include conveyor belt one and conveyor belt two. The first end of conveyor belt one passes around conveyor roller one, conveyor roller three and conveyor roller five in sequence and then connects to the tail end of conveyor belt one, forming a closed loop. The first end of conveyor belt two passes around conveyor roller two, conveyor roller four and conveyor roller six in sequence and then connects to the tail end of conveyor belt two, forming a closed loop.

[0028] Initially, under the elastic force of spring one, the upper surface of the portion of conveyor belt one located between conveyor roller one and conveyor roller three and the lower surface of the portion of conveyor belt two located between conveyor roller two and conveyor roller four are in contact.

[0029] Compared with the prior art, the beneficial effects of this invention are as follows:

[0030] 1. In this scheme, three extruders work together. First, the outermost film material enters the blending gap through buffer zone one and the gap zone connected to buffer zone one, forming carrier one. Then, the middle layer film material enters the blending gap through buffer zone two and the gap zone connected to buffer zone two, and adheres to the inner surface of carrier one, forming carrier two. Finally, the innermost film material enters the blending gap through buffer zone three and the gap zone connected to buffer zone three, and adheres to the inner surface of carrier two, ultimately forming a three-layer film that combines the advantages of each layer.

[0031] Furthermore, based on this, by controlling the feeding pressure of the extruder for a certain layer, the thickness of that layer can be controlled accordingly. For example, the greater the pressure, the greater the extrusion volume and the thicker the layer, and vice versa, thus achieving customized product processing and meeting diverse processing needs.

[0032] Furthermore, the outermost / middle / innermost layers can work independently. In addition to three layers, there can also be two layers, such as the outermost and innermost layers combined, the outermost and middle layers combined, or the middle and innermost layers combined, to meet diverse production needs.

[0033] 2. This solution enables automated film stretching, reducing the labor intensity of workers. Based on this:

[0034] The telescopic rod extends to lift the film upwards, bringing it to the output component. During this process, flexible lifting and lowering is achieved through air, preventing rigid lifting from breaking the film. Furthermore, air outlets are also provided on the upper surface of the air outlet. The technical advantage is that the end of the film that is gathered and pinched into a sealed arrangement can also be effectively cooled and shaped, preventing it from sticking to the air outlet due to insufficient cooling and affecting the subsequent output process. In addition, the film is cooled by blowing air through two airflows, which can quickly and effectively shape the film product during the film lifting stage and in the subsequent continuous production stage.

[0035] After the telescopic rod lifts the film to the output component, the output component clamps and pulls the film away. The telescopic rod then moves downward, away from the output component, for example, located in the middle position between the output component and the co-extrusion die. Its technical advantage lies in the fact that the airflow output through the air outlet at the upper end of the telescopic rod consists of two parts: a first stream output from the air outlet holes on the side of the air outlet and a second stream output from the air outlet holes on the upper surface of the air outlet. The first stream causes the corresponding position of the film to bulge and then flow downwards, while the second stream flows upwards along the centerline of the film before... The flow downwards along the inner surface of the membrane ensures effective cooling without compromising the membrane's cooling efficiency. Furthermore, the portion of the membrane located above the outlet, near the output component, exhibits less bulging. This allows the output component to expel air from the membrane when it is clamped and pulled away, preventing membrane damage. For instance, if the outlet remains close to the output component, the bulging portion of the membrane would be close to the component and could easily cover the bottom of the component, causing the membrane to be caught and pulled apart when pulled away. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the structure of the present invention;

[0037] Figure 2 Side view of the co-extruded blown film component and the output component;

[0038] Figure 3 A schematic diagram of the structure of a co-extruded blown film component;

[0039] Figure 4 A cross-sectional view of a co-extruded blown film component;

[0040] Figure 5 This is a cross-sectional view of the co-extrusion die head;

[0041] Figure 6 An exploded view of the co-extrusion die head;

[0042] Figure 7 This is a schematic diagram of a membrane assembly.

[0043] Figure 8 This is a schematic diagram of the output component.

[0044] The labels in the attached diagram are:

[0045] 100. Extruder; 200. Co-extrusion blown film component; 300. Output component; 301. Upper support; 302. Lower support; 303. Spring 1; 304. Side support; 305. Conveyor belt 1; 306. Conveyor belt 2; 307. Support; 308. Spring 2; 309. Connecting rod; 310. Drive component; 400. Co-extrusion die head; 401. Base; 4011. Side nozzle; 40 12. Stepped groove; 402. Template; 403. Outer mold base; 404. Core tube; 405. Inner mold head; 406. Air guide ring; 407. Heating element; 500. Film stretching assembly; 501. Sealing shell; 5011. Connector 1; 5012. Connector 2; 502. Rotating shaft; 503. Winding reel; 504. Coil spring; 505. Flexible hose; 506. Telescopic rod; 507. Air outlet. Detailed Implementation

[0046] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0047] In the attached diagram of this scheme, 'a' refers to the thin film being blown into shape.

[0048] Reference Figures 1-8 A three-layer co-extrusion blown film machine utilizing plastic blown film includes a co-extrusion blown film component 200 and an output component 300, wherein the co-extrusion blown film component 200 further includes a co-extrusion die head 400 and a film stretching assembly 500.

[0049] 1. Co-extrusion die head 400:

[0050] Reference Figures 4-6 The co-extrusion die 400 includes a ring-shaped base 401 with a vertical axis. The upper surface of the base 401 is provided with stepped grooves 4012. Specifically, the stepped grooves 4012 include four grooves, which are groove one, groove two, groove three and groove four from the outside to the inside. The depth of groove one is less than the depth of groove two, which is less than the depth of groove three and which is less than the depth of groove four. Groove four is open to one side of the base 401. The outer surface of the base 401 is provided with three side nozzles 4011, which are connected to groove four, groove three and groove two respectively. The end of the side nozzles 4011 is provided with an extruder 100. There are three extruders 100, which are used to inject molten plastic into the corresponding grooves. This is feasible with existing technology and will not be described in detail.

[0051] The co-extrusion die 400 also includes a template 402, which is a vertically arranged annular shape with an arc-shaped upper surface. The distance between the arc surface and the center line of the template 402 decreases from bottom to top.

[0052] Template 402 has three templates, namely Template 1, Template 2 and Template 3. Template 1 is set in slot 1 and its outer ring surface is in contact with the slot wall of slot 1. Template 2 is set in slot 2 and the area between its outer ring surface and the slot wall of slot 2 is buffer zone 1. Template 3 is set in slot 3 and the area between its outer ring surface and the slot wall of slot 3 is buffer zone 2. Core tube 404 is coaxially set on the inner ring surface of base 401. The area between the outer ring surface of core tube 404 and the slot wall of slot 4 is buffer zone 3.

[0053] In two adjacent templates 402, there is a gap area between the inner ring surface of the outer template 402 and the outer ring surface of the inner template 402. There is also a gap area between the innermost template 402 and the core tube 404. There are a total of three gap areas, which are connected to three buffer zones respectively.

[0054] The upper surface of the base 401 is provided with an outer mold base 403, and the upper end of the core tube 404 is provided with an inner mold head 405.

[0055] The diameter of the inner ring surface of the outer mold base 403 decreases from bottom to top, then remains constant, and finally increases. The diameter of the outer surface of the inner mold head 405 increases from bottom to top and then decreases.

[0056] The inner ring surface of the outer mold base 403, the outer surface of the inner mold head 405, and the arc surfaces of the three templates 402 together form a mixing gap, which is connected to the three gap areas.

[0057] Working process of co-extrusion die 400:

[0058] Three extruders 100 work together. First, the outermost film material passes through buffer zone one and the gap zone connected to buffer zone one into the blending gap, forming carrier one. Then, the middle layer film material passes through buffer zone two and the gap zone connected to buffer zone two into the blending gap, and adheres to the inner surface of carrier one, forming carrier two. Finally, the innermost film material passes through buffer zone three and the gap zone connected to buffer zone three into the blending gap, and adheres to the inner surface of carrier two, ultimately forming a three-layer film that combines the advantages of each layer.

[0059] Furthermore, based on this, by controlling the feeding pressure of the extruder 100 for a certain layer, the thickness of that layer can be controlled accordingly. For example, the greater the pressure, the greater the extrusion volume and the thicker the layer, and vice versa, thus achieving customized product processing and meeting diverse processing needs.

[0060] Furthermore, the outermost / middle / innermost layers can work independently. In addition to three layers, there can also be two layers, such as the outermost and innermost layers combined, the outermost and middle layers combined, or the middle and innermost layers combined, to meet diverse production needs.

[0061] Preferably, the outer surface of the outer mold base 403 is provided with a heating element 407, which serves to heat and keep warm.

[0062] II. Membrane Stretching Component 500:

[0063] Reference Figure 3 , Figure 4 and Figure 7 The film stretching assembly 500 includes a sealing shell 501, which is located below the base 401. A telescopic rod 506 is provided on the upper surface of the sealing shell 501. The upper end of the telescopic rod 506 passes through the core tube 404 and the clearance hole provided on the inner die head 405, and is located above the co-extrusion die head 400.

[0064] Specifically, the telescopic rod 506 is composed of several telescopic sections. The telescopic section is hollow inside and has an internal step at the upper end and an external step at the lower end. When the telescopic rod 506 extends, the external step of the upper telescopic section fits into the lower telescopic section. At the same time, the cooperation between the internal step and the external step prevents the two adjacent telescopic sections from separating.

[0065] The lower end of the telescopic rod 506 is connected to the upper surface of the sealing shell 501, and the upper surface of the sealing shell 501 is provided with a connection hole that communicates with the telescopic rod 506.

[0066] The upper end of the telescopic rod 506 is provided with an air outlet 507, and the side and upper surface of the air outlet 507 are provided with a number of air outlet holes.

[0067] A rotating shaft 502 is rotatably mounted inside the sealed housing 501, and a coil spring 504 is provided at the mounting point. A winding disc 503 is provided on the outside of the rotating shaft 502, and a connecting groove is provided at one end of the rotating shaft 502.

[0068] The telescopic rod 506 is equipped with a flexible hose 505. One end of the flexible hose 505 is provided with a fixed step and the fixed step is connected to the upper end of the telescopic rod 506. The other end of the flexible hose 505 passes around the winding disc 503 and is connected to the rotating shaft 502. The rotating shaft 502 is provided with a fixed hole for connecting the connecting groove and the flexible hose 505.

[0069] The outer circular surface of the sealing shell 501 is provided with a first connector 5011 and a second connector 5012. Each of the two is provided with an air pump (not shown in the figure) at its end. In addition, the end of the rotating shaft 502 with a connecting groove is fitted into the first connector 5011.

[0070] Working process of membrane assembly 500:

[0071] Air enters the sealing shell 501 through the second connector 5012, and then enters the telescopic rod 506 through the connecting hole. Since the upper end of the telescopic rod 506 is connected to the fixed step, it is equivalent to being blocked. Therefore, with the continuous inflow of air, the telescopic rod 506 extends. Conversely, when the air in the sealing shell 501 is extracted through the second connector 5012, the telescopic rod 506 shortens.

[0072] Air flows into the hose 505 through the connector 5011, the connecting groove, and the fixing hole, then flows into the air outlet 507, and flows out through the air outlet.

[0073] III. Cooling and Shaping:

[0074] Reference Figure 5 The upper surface of the outer mold base 403 is provided with an air guide ring 406. The air guide ring 406 is hollow inside and has a connector on the outer ring surface. A blower (not shown in the figure) is provided at the end of the connector. The diameter of the inner ring surface increases from bottom to top and has several air blowing holes distributed in an array.

[0075] IV. Output component 300:

[0076] The output component 300 is located above the co-extrusion blown film component 200.

[0077] Reference Figure 8 The output component 300 includes a fixed lower support 302, a vertically arranged guide rod on the upper surface of the lower support 302, an upper support 301 slidably mounted on the guide rod, a nut at the upper end of the guide rod, and a spring 303 sleeved on the outside of the guide rod between the nut and the upper support 301.

[0078] Each of the lower support 302 and the upper support 301 is hinged to a side support 304 at one end, and the two side supports 304 are arranged in a herringbone shape. The other end of the lower support 302 is provided with a first conveyor roller, and the other end of the upper support 301 is provided with a second conveyor roller.

[0079] Each of the lower support 302 and the upper support 301 is equipped with a drive assembly for driving the side support 304 to deflect. Specifically, the two drive assemblies are located on opposite sides of the two side supports 304. The drive assembly includes a connecting rod 309 connected to the upper support 301 or the lower support 302. The end of the connecting rod 309 is hinged to a drive element 310. The output end of the drive element 310 is hinged to the side support 304. The drive element 310 can drive the distance between the side support 304 and the connecting rod 309 to change. If the distance increases, the two side supports 304 can be driven to move closer together. Conversely, if the distance decreases, the two side supports 304 will move away from each other. The drive element 310 can adopt existing electric telescopic rod technology or existing linear screw stepper motor technology, etc., which will not be elaborated further.

[0080] A conveying roller three is provided on the hinge shaft formed at the hinge joint between the side support 304 and the lower support 302, and a conveying roller four is provided on the hinge shaft formed at the hinge joint between the side support 304 and the upper support 301.

[0081] A conveying roller five is provided at the lower end of the side support 304 connected to the lower support 302, and a conveying roller six is ​​provided at the lower end of the side support 304 connected to the upper support 301.

[0082] All conveyor rollers are parallel to each other and parallel to the hinge axis between the side support 304 and the upper support 301 or the lower support 302. In addition, each end of conveyor roller one and conveyor roller two is powered by a motor (not shown in the figure).

[0083] The output component 300 also includes two conveyor belts: conveyor belt one 305 and conveyor belt two 306, wherein:

[0084] The first end of conveyor belt 305 passes over conveyor roller 1, conveyor roller 3 and conveyor roller 5 in sequence and then connects to the tail end of conveyor belt 305, forming a closed loop.

[0085] The first end of conveyor belt 2 306 passes around conveyor roller 2, conveyor roller 4 and conveyor roller 6 in sequence and then connects to the tail end of conveyor belt 2 306, forming a closed loop.

[0086] Initially, under the elastic force of spring 303, the upper surface of the portion of conveyor belt 305 located between conveyor roller 1 and conveyor roller 3 and the lower surface of the portion of conveyor belt 306 located between conveyor roller 2 and conveyor roller 4 are in contact.

[0087] Preferably, in order to keep conveyor belt 1 305 and conveyor belt 2 306 taut, a support 307 is slidably provided at the end of the side bracket 304 in a direction perpendicular to conveyor roller 1. Conveyor roller 5 and conveyor roller 6 are each provided with a corresponding support 307. A spring 2 308 is provided between the support 307 and the side bracket 304. The elastic force of the spring 2 308 is used to move the support 307 away from the lower bracket 302, thereby enabling conveyor belt 1 305 and conveyor belt 2 306 to be taut and kept taut.

[0088] Working principle of the invention:

[0089] Three extruders 100 work together. First, the outermost film material passes through buffer zone one and the gap zone connected to buffer zone one into the blending gap, forming carrier one. Then, the middle layer film material passes through buffer zone two and the gap zone connected to buffer zone two into the blending gap, and adheres to the inner surface of carrier one, forming carrier two. Finally, the innermost film material passes through buffer zone three and the gap zone connected to buffer zone three into the blending gap, and adheres to the inner surface of carrier two, ultimately forming a three-layer film that combines the advantages of each layer.

[0090] At the same time, air flows into the hose 505 through the nozzle 5011, the connecting groove, and the fixing hole, and then into the air outlet 507. It flows out through the air outlet and the air guide ring 406 and the blowing hole. The two airflows work together to cool the film extruded through the co-extrusion die 400. It should be noted that the film is still sticky and workers need to manually gather the film into a ball and arrange it in a sealed manner.

[0091] Then, air enters the sealing housing 501 through the connector 2 5012, and then enters the telescopic rod 506 through the connecting hole, causing the telescopic rod 506 to extend. At the same time, the two airflows for cooling mentioned above continue to operate, therefore:

[0092] The telescopic rod 506 can extend to lift the film upwards and push it to the output component 300. During this process, the lifting and lowering is driven flexibly by air to avoid rigidly lifting and breaking the film. Furthermore, the upper surface of the air outlet 507 is also provided with air outlet holes. Its technical advantage is that the end of the film that is gathered and pinched into a sealed arrangement can also be effectively cooled and formed, avoiding the end from sticking to the air outlet 507 due to ineffective cooling, which would affect the subsequent output process.

[0093] By using two airflows to cool the film, the film product can be quickly and effectively shaped during the lifting stage and subsequent continuous production stages.

[0094] After the telescopic rod 506 lifts the film to the output component 300, the drive component 310 operates to increase the distance between the side support 304 and the connecting rod 309, causing the two side supports 304 to move closer together, thereby causing the film to be clamped by the first conveyor belt 305 and the second conveyor belt 306. At the same time, the first conveyor belt 305 and the second conveyor belt 306 start, thus clamping the film and outputting it outward. It should be noted that how the film is stored after output is feasible with existing technology and will not be described in detail.

[0095] The telescopic rod 506 moves downward, away from the output component 300, for example, located at the midpoint between the output component 300 and the co-extrusion die head 400. Its technical advantage lies in the fact that the airflow output through the air outlet 507 located at the upper end of the telescopic rod 506 consists of two parts: a first stream output from the air outlet holes on the side of the air outlet 507 and a second stream output from the air outlet holes on the upper surface of the air outlet 507. The first stream causes the corresponding position of the film to bulge and then flows downwards. The second stream flows upwards along the centerline of the film and then downwards along the inner surface of the film. This does not affect… Effective cooling of the membrane is achieved by minimizing the bulging of the portion of the membrane located above the air outlet 507, i.e., near the output member 300. This allows the output member 300 to expel air from the membrane when it clamps and pulls the membrane away, and also helps prevent the membrane from breaking. For example, if the air outlet 507 is still close to the output member 300, the bulging portion of the membrane will be close to the output member 300 and may easily cover the bottom of the output member 300. This could cause the membrane to be hooked by the output member 300 and torn when it is pulled away by the output member 300.

[0096] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A three-layer co-extrusion blown film machine utilizing plastic blown film, characterized in that, It includes a co-extrusion blown film component (200) and an output component (300), wherein the co-extrusion blown film component (200) includes a co-extrusion die (400) and a film stretching assembly (500); The film stretching assembly (500) includes a sealing shell (501), a telescopic rod (506) is provided on the upper surface of the sealing shell (501), the upper end of the telescopic rod (506) passes through the co-extrusion die (400) and is provided with an air outlet (507), the side and upper surface of the air outlet (507) are provided with a plurality of air outlet holes arranged in an array, the lower end of the telescopic rod (506) is connected to the upper surface of the sealing shell (501) and the upper surface of the sealing shell (501) is provided with a connection hole communicating with the telescopic rod (506); A rotating shaft (502) is rotatably installed inside the sealed housing (501) and a coil spring (504) is provided at the installation location. A winding disc (503) is provided on the outside of the rotating shaft (502), and a connecting groove is provided at one end of the rotating shaft (502). The telescopic rod (506) is equipped with a flexible hose (505). One end of the flexible hose (505) is provided with a fixed step and the fixed step is connected to the upper end of the telescopic rod (506). The other end of the flexible hose (505) passes around the winding disc (503) and is connected to the rotating shaft (502). The rotating shaft (502) is provided with a fixed hole for connecting the connecting groove and the flexible hose (505). The outer circular surface of the sealing shell (501) is provided with a first connector (5011) and a second connector (5012), and each of the two is provided with an air pump at its end. The end of the rotating shaft (502) with a connecting groove is fitted inside the first connector (5011).

2. The three-layer co-extrusion blown film machine utilizing plastic blown film according to claim 1, characterized in that, The telescopic rod (506) is composed of several telescopic sections. The telescopic section is hollow inside and has an internal step at the upper end and an external step at the lower end. When the telescopic rod (506) is extended, the external step of the upper telescopic section is fitted into the lower telescopic section. At the same time, the cooperation between the internal step and the external step prevents the two adjacent telescopic sections from separating.

3. A three-layer co-extrusion blown film machine utilizing plastic blown film according to claim 1, characterized in that, The co-extrusion die (400) includes a ring-shaped base (401) with the centerline of the base (401) being vertical. The upper surface of the base (401) is provided with a stepped groove (4012). The stepped groove (4012) includes four grooves, which are groove one, groove two, groove three and groove four from the outside to the inside. The groove depth of groove one is less than the groove depth of groove two, which is less than the groove depth of groove three and which is less than the groove depth of groove four. Groove four is open to one side of the base (401). The outer surface of the base (401) is provided with three side nozzles (4011). The three side nozzles (4011) are connected to groove four, groove three and groove two respectively. The end of the side nozzle (4011) is provided with an extruder (100). There are three extruders (100) respectively.

4. A three-layer co-extrusion blown film machine utilizing plastic blown film according to claim 3, characterized in that, The co-extrusion die (400) also includes a template (402), which is a vertically arranged annular shape and has an arc-shaped upper surface. The distance between the arc surface and the center line of the template (402) decreases from bottom to top. The template (402) is provided with three templates, namely template one, template two and template three. Template one is set in the groove one and the outer ring surface of template one is in contact with the groove wall of the groove one. Template two is set in the groove two and the area between the outer ring surface of template two and the groove wall of the groove two is buffer zone one. Template three is set in the groove three and the area between the outer ring surface of template three and the groove wall of the groove three is buffer zone two. The inner ring surface of the base (401) is coaxially provided with a core tube (404) and the area between the outer ring surface of the core tube (404) and the groove wall of the groove four is buffer zone three. In two adjacent templates (402), there are gap areas between the inner ring surface of the outer template (402) and the outer ring surface of the inner template (402), as well as between the innermost template (402) and the core tube (404). There are a total of three gap areas, which are respectively connected to buffer zone one, buffer zone two and buffer zone three.

5. A three-layer co-extrusion blown film machine utilizing plastic blown film according to claim 4, characterized in that, An outer mold base (403) is provided on the upper surface of the base (401), an inner mold head (405) is provided at the upper end of the core tube (404), and a telescopic rod (506) passes through the core tube (404). The diameter of the inner ring surface of the outer mold base (403) decreases from bottom to top, then remains constant, and finally increases. The diameter of the outer surface of the inner mold head (405) increases from bottom to top and then decreases. The inner ring surface of the outer mold base (403), the outer surface of the inner mold head (405), and the arc surfaces of the three templates (402) together form a mixing gap, which is connected to the three gap areas.

6. A three-layer co-extrusion blown film machine utilizing plastic blown film according to claim 5, characterized in that, Heating elements (407) are provided on the outer surface of the outer mold base (403).

7. A three-layer co-extrusion blown film machine utilizing plastic blown film according to claim 5, characterized in that, The upper surface of the outer mold base (403) is provided with an air guide ring (406). The air guide ring (406) is hollow inside and has a connector on the outer ring surface. A blower is provided at the end of the connector. The diameter of the inner ring surface increases from bottom to top and has several air holes distributed in an array.

8. A three-layer co-extrusion blown film machine utilizing plastic blown film according to claim 1, characterized in that, The output component (300) includes a fixed lower support (302), a vertically arranged guide rod is provided on the upper surface of the lower support (302), an upper support (301) is slidably provided on the guide rod, a nut is provided at the upper end of the guide rod, and a spring (303) is sleeved on the outside of the guide rod between the nut and the upper support (301). A side support (304) is hinged to one end of the lower support (302) and the upper support (301). The two side supports (304) are arranged in a herringbone shape. A conveying roller one is provided at the other end of the lower support (302), and a conveying roller two is provided at the other end of the upper support (301). Each of the lower support (302) and the upper support (301) is provided with a drive assembly, which is used to drive the side support (304) to deflect.

9. A three-layer co-extrusion blown film machine utilizing plastic blown film according to claim 8, characterized in that, Two drive components are located on opposite sides of two side supports (304). Each drive component includes a connecting rod (309) connected to the upper support (301) or the lower support (302). A drive member (310) is hinged to the end of the connecting rod (309). The output end of the drive member (310) is hinged to the side support (304). The drive member (310) can drive the distance between the side support (304) and the connecting rod (309) to change.

10. A three-layer co-extrusion blown film machine utilizing plastic blown film according to claim 8, characterized in that, A conveying roller three is provided on the hinge shaft formed at the hinge joint of the side support (304) and the lower support (302), and a conveying roller four is provided on the hinge shaft formed at the hinge joint of the side support (304) and the upper support (301). A conveying roller five is provided at the lower end of the side support (304) connected to the lower support (302), and a conveying roller six is ​​provided at the lower end of the side support (304) connected to the upper support (301); Conveyor roller 1, conveyor roller 2, conveyor roller 3, conveyor roller 4, conveyor roller 5 and conveyor roller 6 are parallel to each other and are all parallel to the hinge axis between the side support (304) and the upper support (301). The ends of conveyor roller 1 and conveyor roller 2 are each powered by a motor. The output component (300) also includes a first conveyor belt (305) and a second conveyor belt (306). The first end of the first conveyor belt (305) passes around the first conveyor roller, the third conveyor roller and the fifth conveyor roller in sequence and then connects to the tail end of the first conveyor belt (305) to form a closed loop. The first end of the second conveyor belt (306) passes around the second conveyor roller, the fourth conveyor roller and the sixth conveyor roller in sequence and then connects to the tail end of the second conveyor belt (306) to form a closed loop. Initially, under the elastic force of spring 1 (303), the upper surface of the portion of conveyor belt 1 (305) located between conveyor roller 1 and conveyor roller 3 and the lower surface of the portion of conveyor belt 2 (306) located between conveyor roller 2 and conveyor 4 are in contact.

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