Five-layer co-extrusion blown film process for a composite film

Abstract

The present application relates to the technical field of film blowing process, in particular to a five-layer co-extrusion film blowing process of composite film; comprising the following steps: S1: raw material particles are heated and melted by heating equipment, and then are extruded into a die by an extruder, and are discharged along a ring-shaped discharge port of the die; S2: the ring-shaped film material discharged by the ring-shaped discharge port enters a ring groove in a film pulling assembly, and a clamping block clamps the ring-shaped film material in the ring groove under the action of medium pressure, and then the film pulling is started; S3: the inner disc moves upwards and contacts the sealing disc, the ring-shaped film material is expanded under the action of gas, then the staff tears the part of the ring-shaped film material close to the ring groove and aggregates into a strip, and then the ring-shaped film material in the strip is wound on a winding roller by passing through a traction roller; the present application clamps the ring-shaped film material in the ring groove by the clamping block under the action of the medium source, so that the ring-shaped film material can be uniformly pulled, compared with the original manual pulling of the ring-shaped film material, the operation is more convenient and is not easy to be pulled and cracked, and the film pulling success rate is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of film blowing process, in particular to a five-layer co-extrusion film blowing process of composite film. BACKGROUND

[0002] The five-layer co-extrusion refers to feeding from five feeding ports respectively; the five-layer co-extrusion film blowing process mainly comprises the following steps: a. automatically feeding according to the composition requirement of each layer; b. the high-temperature co-extrusion molten raw material particles are blown into cylindrical plastic film upward through the high pressure of the die, and are manually pulled to the traction roller for traction, and finally are wound by the winding roller.

[0003] Manual film pulling is an important link in the film blowing process. After the raw material passes through the extruder and the die, the worker will pull the annular material at the die outlet to realize the demolding process. Manual film pulling may not accurately grasp the pulling force of the annular material and may not be uniform, often causing tearing. For some annular materials with large diameters, multiple people are needed to assist in the demolding process, which is inconvenient.

[0004] In view of this, in order to overcome the above technical problems, the present application provides a five-layer co-extrusion film blowing process of composite film, which solves the above technical problems. SUMMARY

[0005] In order to make up for the shortcomings of the prior art, the present application provides a five-layer co-extrusion film blowing process of composite film. The annular film material in the annular groove is clamped by the clamping block under the action of the medium source, so that the annular film material can be uniformly pulled. Compared with the original manual pulling of the annular film material, the operation is more convenient and less likely to tear, and the film pulling success rate is improved.

[0006] The technical scheme adopted by the present application to solve its technical problems is: the five-layer co-extrusion film blowing process of composite film comprises the following steps:

[0007] S1: start five extruders to feed according to the composition requirement of each layer, and melt the raw material particles in the heating device to cooperate with the extruder to extrude into the die, and discharge along the annular discharge port of the die;

[0008] S2: the annular film material discharged from the annular discharge port enters the annular groove in the film pulling assembly, the clamping block moves along the clamping groove and approaches the outer wall of the inner disc under the action of the medium pressure, clamps the annular film material between the clamping block and the inner disc, and then the worker controls the upward movement of the film pulling assembly, and the upward movement of the film pulling assembly uniformly pulls the annular film material;

[0009] S3: the inner disc in the film pulling assembly moves a distance and contacts the sealing disc, the annular film material is stretched under the action of the gas discharged from the center of the die, then the staff tears the part of the annular film material close to the ring groove and aggregates into a strip, then the annular film material in the strip is wound on the winding roller through the traction roller;

[0010] The film pulling assembly used in S2-S3 comprises:

[0011] The inner disc is provided with an air outlet hole and a sliding hole at the upper end;

[0012] The sliding rod is in sliding connection with the sliding hole, and the length of the sliding rod is higher than the thickness of the inner disc;

[0013] The sealing disc is located above the inner disc and is fixedly connected with the sliding rod, and the vertical projection surface of the sealing disc covers the air outlet hole;

[0014] The outer ring is sleeved outside the inner disc and is concentric with the inner disc, the inner wall of the outer ring is uniformly provided with clamping grooves, the clamping grooves are in sliding connection with clamping blocks, the bottom of the clamping groove is connected with a medium source, the outer ring and the inner disc form a ring groove, the ring groove corresponds to the annular discharge port of the die, the upper end of the outer ring is connected with the upper end of the inner disc through a connecting block, and the bottoms of all the clamping grooves are in communication with each other.

[0015] Preferably, a rectangular rod is vertically arranged outside the outer ring, the rectangular rod is rotationally connected to the upper end of the die, the outer wall of the rectangular rod is in sliding connection with a ring shell, the ring shell is internally provided with a ring cavity, the piston is in sliding sealing connection with the ring cavity, the piston divides the ring cavity into an upper cavity and a lower cavity, the lower end of the piston is fixedly connected with a push rod, the push rod passes through the ring shell and is in sliding sealing connection with the ring shell, the piston and the upper wall of the upper cavity are connected through a first spring, the push rod abuts against the upper end of the die in the initial state, one of the connecting blocks and the ring shell are connected through a connecting rod, the connecting rod is internally provided with an air channel, one end of the air channel is in communication with the lower cavity, and the other end of the air channel is in communication with the bottom of the clamping groove.

[0016] Preferably, the side wall of the rectangular rod is provided with an upper turning groove and a lower turning groove, the upper turning groove is located above the ring shell, the lower turning groove is located below the ring shell, the upper turning groove and the lower turning groove are in communication through a vertical groove, the upper roller is rotationally connected in the upper turning groove, the lower roller is rotationally connected in the lower turning groove, one end of the lower roller extends to the outside of the ring shell and is fixedly connected with a crank handle, the upper end of the ring shell is fixedly connected with a pulling rope, the other end of the pulling rope passes through the vertical groove and is wound on the lower roller after passing through the upper roller, and the bottom of the clamping groove and the clamping block are connected through a tension spring.

[0017] Preferably, the handle is composed of a handle stick, a handle disc and a handle head connected in sequence; the handle stick is connected with the lower roller; a locking sleeve is slidingly connected on the handle stick; the locking sleeve and the handle disc are connected through a second spring; the second spring is sleeved on the handle stick; a locking ring is arranged between the locking sleeve and the rectangular rod; the locking ring is sleeved on the outer wall of the handle stick and fixedly connected with the rectangular rod; the locking ring and the locking sleeve are unidirectionally engaged on the surface close to each other; a first unidirectional tooth is arranged on the surface of the locking ring close to the locking sleeve; a second unidirectional tooth is arranged on the surface of the locking sleeve close to the locking ring; the first unidirectional tooth and the second unidirectional tooth are unidirectionally engaged; the cross section of the handle stick is square; the locking ring is rotationally connected with the handle stick.

[0018] Preferably, the outer wall of the rectangular rod and the position close to the die head are fixedly connected with a clamping seat; a circular groove is arranged at the lower end of the clamping seat; a clamping block is slidingly connected in the circular groove; the clamping block and the groove bottom are connected through a third spring; a chamfer is arranged at the end of the clamping block away from the groove bottom; two clamping grooves are arranged at the upper end of the die head; one of the clamping grooves is aligned with the circular groove after the circular groove corresponds to the annular discharge port.

[0019] Preferably, the lower end of the inner disc is provided with a first hole; the other end of the first hole is communicated with the upper cavity through a connecting block and a connecting rod; the gas outlet direction of the first hole is multiple.

[0020] Preferably, the lower end of the sliding rod is provided with a groove; a sliding strip is slidingly connected in the groove; the sliding strip and the groove bottom are connected through a fourth spring; a first rectangular groove is arranged through the groove wall and the outer wall of the sliding rod; a locking block is slidingly connected in the first rectangular groove; a triangular groove is arranged on the outer wall of the sliding strip close to the first rectangular groove; the locking block is slidingly connected on the inclined surface of the triangular groove; a second rectangular groove is arranged at the position corresponding to the first rectangular groove of the sliding hole.

[0021] Preferably, a first magnet is embedded on the lower end surface of the sliding rod; a second magnet is embedded on the position corresponding to the sliding strip at the upper end of the die head; the first magnet and the second magnet are magnetically opposite; the first rectangular groove is annular.

[0022] The beneficial effects of the present application are as follows:

[0023] 1. The ring-shaped film material in the ring groove is clamped by the clamping block under the action of the medium source, so that the ring-shaped film material can be uniformly pulled, compared with the original manual pulling of the ring-shaped film material, the operation is more convenient and not easy to be pulled apart, and the film pulling success rate is improved.

[0024] 2. The present application gives the tension spring a downward tension when the staff stops shaking the handle, thereby giving the lower roller and the rocking stick a reverse rotating force through the pull rope. Due to the action of the second spring, the second one-way tooth on the locking sleeve is in contact with and engaged with the first one-way tooth on the locking ring, so that the rocking stick cannot rotate, achieving the purpose of locking the ring shell, so that the staff can stop moving at any time during the movement of the ring shell.

[0025] 3. With the continuous upward movement of the ring shell, the sealing disc seals the air outlet hole, and the pressure increases when the gas cannot be discharged between the inner disc and the upper end of the die head. The gas enters the upper cavity through the first hole, thereby giving the piston a downward force, so that the medium in the lower cavity has a greater force to clamp the annular film material through the clamping block, thereby making the annular film material not easy to separate from the ring groove during the film pulling process, improving the film pulling stability. BRIEF DESCRIPTION OF DRAWINGS

[0026] The present application will be further described below in conjunction with the drawings and embodiments.

[0027] Figure 1 is a method flowchart of the present application;

[0028] Figure 2 is a perspective view of the film pulling assembly in the present application;

[0029] Figure 3 is Figure 2 an enlarged view of A in

[0030] Figure 4 is a non-use state diagram of the film pulling assembly in the present application;

[0031] Figure 5 is a position structure diagram of the handle and the locking sleeve in the present application;

[0032] Figure 6 is a cross-sectional view of the ring shell in the present application;

[0033] Figure 7 is a cross-sectional view of the inner disc in the present application;

[0034] Figure 8 is Figure 7 an enlarged view of B in

[0035] Figure 9 is Figure 7 an enlarged view of C in

[0036] Figure 10 is Figure 7 an enlarged view of D in

[0037] In the figure: die a, clamping groove a1, No. 2 magnet a2, inner disc 1, air outlet 11, sliding hole 12, No. 1 hole 13, No. 2 rectangular groove 14, sliding rod 2, groove 21, sliding strip 22, No. 4 spring 23, No. 1 rectangular groove 24, locking block 25, triangular groove 26, No. 1 magnet 27, sealing disc 3, outer ring 4, clamping groove 41, clamping block 42, connecting block 43, tension spring 44, ring groove 5, rectangular rod 6, upper turning groove 61, lower turning groove 62, vertical groove 63, upper roller 64, lower roller 65, clamping seat 66, circular groove 67, clamping block 68, No. 3 spring 69, ring shell 7, ring cavity 71, upper cavity 711, lower cavity 712, piston 72, push rod 73, No. 1 spring 74, pull rope 75, connecting rod 8, air channel 81, crank 9, crank rod 91, crank plate 92, crank head 93, locking sleeve 94, No. 2 spring 95, locking ring 96. DETAILED DESCRIPTION

[0038] In order to make the technical means, creative features, purposes and effects realized by the present application easy to understand, the present application will be further described below in conjunction with specific embodiments.

[0039] As Figures 1 to 10 shown, the present application is described in detail in the following embodiments:

[0040] Embodiment 1:

[0041] A five-layer co-extrusion blown film process of a composite film, comprising the following steps:

[0042] S1: Start five extruders according to the composition requirements of each layer respectively, and feed the raw material particles into the die a through the heating equipment, and then along the annular discharge port of the die a;

[0043] S2: The annular film material discharged from the annular discharge port enters the ring groove 5 in the film pulling assembly, and the clamping block 42 moves along the clamping groove 41 and approaches the outer wall of the inner disc 1 under the action of medium pressure, and clamps the annular film material between the clamping block 42 and the inner disc 1, and then the staff controls the upward movement of the film pulling assembly, and the upward movement of the film pulling assembly uniformly pulls the annular film material;

[0044] S3: After the inner disc 1 in the film pulling assembly moves up for a distance and contacts the sealing disc 3, the annular film material is expanded under the action of the gas discharged from the center of the die a, and then the staff tears the part of the annular film material close to the ring groove 5 and aggregates into a strip, and then the annular film material in the form of a strip is wound on the winding roller through the traction roller;

[0045] Among them, the film pulling assembly used in S2-S3 comprises:

[0046] The inner disc 1 is provided with an air outlet 11 and a sliding hole 12 at the upper end;

[0047] Slide bar 2; the slide bar 2 is in sliding connection with the slide hole 12; the length of the slide bar 2 is higher than the thickness of the inner disc 1;

[0048] Sealing disc 3; the sealing disc 3 is located above the inner disc 1 and is fixedly connected with the slide bar 2; the vertical projection surface of the sealing disc 3 covers the air outlet hole 11;

[0049] Outer ring 4; the outer ring 4 is sleeved outside the inner disc 1 and is concentric with the inner disc 1; the inner wall of the outer ring 4 is uniformly provided with clamping grooves 41; the clamping grooves 41 are in sliding connection with clamping blocks 42; the clamping grooves 41 are connected with a medium source at the groove bottom; the outer ring 4 and the inner disc 1 form a ring groove 5; the ring groove 5 corresponds to the annular discharge port of the die a; the upper end of the outer ring 4 is connected with the upper end of the inner disc 1 through a connecting block 43; the groove bottoms of all the clamping grooves 41 are in communication with each other;

[0050] In use, manual film pulling is an important link in the film blowing process. After the material is extruded through the extruder and the die, the worker will pull the annular film material at the die discharge port to realize the mold pulling process. The manual film pulling may not accurately grasp the pulling force of the annular film material and may not be uniform, often causing tearing. Moreover, for some annular film materials with large diameters, multiple people are needed to assist in the mold pulling process, which is relatively inconvenient.

[0051] Therefore, the staff of the present application first starts five extruders according to the composition requirements of each layer respectively, and the raw material particles are heated and melted by the heating device, and then extruded into the die a of the extruder, and discharged along the annular discharge port of the die a. Since the ring groove 5 in the film pulling assembly corresponds to the annular discharge port, the annular film material discharged from the annular discharge port enters the ring groove 5. Then the medium source fills the medium into the inside of the clamping groove 41, such as gas or liquid. The clamping block 42 moves along the clamping groove 41 and approaches the outer wall of the inner disc 1 under the action of the medium pressure. The end of the clamping block 42 away from the groove bottom of the clamping groove 41 matches the outer wall of the inner disc 1. Therefore, after the clamping block 42 moves, the annular film material is clamped between the clamping block 42 and the inner disc 1. Since the clamping grooves 41 are uniformly distributed on the inner wall of the outer ring 4, and the adjacent clamping grooves 41 are arranged relatively close to each other, the annular film material in the annular groove can be clamped. Then the staff controls the upward movement of the film pulling assembly. The upward movement of the film pulling assembly uniformly pulls the annular film material. The annular film material is not easy to be pulled apart after being uniformly pulled, so that the film pulling process is more smooth. In the initial state of the inner disc 1, the slide rod 2 is in contact with the die a. Therefore, there is a gap between the sealing disc 3 and the inner disc 1. The gas generated inside the annular discharge port of the die a is discharged to the outside along the gas outlet hole 11. With the upward movement of the inner disc 1 and the outer ring 4, the slide hole 12 on the inner disc 1 and the slide rod 2 slide relatively under the condition that the slide rod 2 and the sealing disc 3 remain stationary. At the same time, the inner disc 1 moves towards the sealing disc 3 until the lower end of the sealing disc 3 is attached to the upper end of the inner disc 1. The annular film material is clamped and sealed by the clamping block 42 in the ring groove 5. Therefore, the gas generated inside the annular discharge port of the die a is gathered between the inner disc 1, the annular film material and the die a, so that the annular film material is inflated under the action of the gas pressure, and the annular film material is lifted. Then the staff tears and aggregates the part of the annular film material close to the ring groove 5 into a strip after the annular film material is pulled up by a distance. Then the annular film material is wound on the winding roller through the traction roller. The residual material clamped in the ring groove 5 is moved close to the groove bottom of the clamping groove 41 under the action of the medium source, and the residual material between the clamping block 42 and the outer wall of the inner disc 1 is not clamped and is taken out manually. The gas discharged from the gas outlet hole 11 rebounds through the sealing disc 3 and blows the upper end of the inner disc 1, so that the impurities on the lower end of the sealing disc 3 and the upper end of the inner disc 1 are blown away, avoiding the impurities being stuck between the sealing disc 3 and the inner disc 1 to affect the sealing performance.

[0052] The present application clamps the annular film material in the ring groove 5 by the clamping block 42 under the action of the medium source, so that the annular film material can be uniformly pulled. Compared with the previous manual pulling of the annular film material, the operation is more convenient and the annular film material is not easy to be pulled apart, thereby improving the success rate of film pulling.

[0053] In the embodiment, the outer ring 4 is vertically provided with a rectangular rod 6 outside; the rectangular rod 6 is rotationally connected to the upper end of the die a; the outer wall of the rectangular rod 6 is slidingly connected with a ring shell 7; the ring shell 7 is internally provided with a ring cavity 71; the ring cavity 71 is slidingly and sealingly connected with a piston 72 in an up-and-down manner; the piston 72 divides the ring cavity 71 into an upper cavity 711 and a lower cavity 712; the lower end of the piston 72 is fixedly connected with a push rod 73; the push rod 73 penetrates through the ring shell 7 and is slidingly and sealingly connected with the ring shell 7; the piston 72 is connected with the upper wall of the upper cavity 711 through a first spring 74; the push rod 73 abuts against the upper end of the die a in an initial state; one of the connecting blocks 43 is connected with the ring shell 7 through a connecting rod 8; the connecting rod 8 is internally provided with an air channel 81; one end of the air channel 81 is in communication with the lower cavity 712, and the other end is in communication with the bottom of the clamping groove 41;

[0054] In use, after the annular film material enters the ring groove 5 through the annular discharge port, the worker lifts up the ring shell 7; the ring shell 7 drives the connecting rod 8, the outer ring 4 and the inner disc 1 to synchronously move upward in the process of upward movement; the ring shell 7 moves relatively to the piston 72; the piston 72 drives the push rod 73 to abut against the upper end of the die a under the action of the first spring 74; the internal space of the lower cavity 712 becomes smaller in the process of upward movement of the ring shell 7; the lower cavity 712 is filled with medium; the medium can be gas or liquid; the medium in the lower cavity 712 enters the clamping groove 41 along the air channel 81 under the extrusion of the piston 72, thereby driving the clamping block 42 to move away from the bottom of the clamping groove 41, and further driving the annular film material in the ring groove 5 to be clamped by the clamping block 42; as the ring shell 7 continues to move upward, the ring shell 7 slides upward along the rectangular rod 6; the length direction of the rectangular rod 6 is perpendicular to the upper end of the die a, so that the ring shell 7 drives the inner disc 1 and the outer ring 4 to synchronously move upward while horizontally placed, so that the annular film material is uniformly pulled upward; after the worker tears and pulls the annular film material to the winding roller, the worker controls the rectangular rod 6 to rotate; the rectangular rod 6 drives the ring shell 7, the inner disc 1 and the outer ring 4 to horizontally rotate and move away from the annular discharge port on the die a; the rotating angle of the rectangular rod 6 can be 180 degrees; then the ring shell 7 is controlled to move downward; the ring shell 7 drives the piston 72, the push rod 73, the connecting rod 8, the outer ring 4 and the inner disc 1 to synchronously move downward; after the push rod 73 contacts the upper end of the die a, the push rod 73 and the piston 72 stop moving; the ring shell 7 continues to move downward, so that the ring shell 7 moves relatively to the piston 72; the space of the lower cavity 712 becomes larger in the process of downward movement of the ring shell 7; after the lower cavity 712 generates negative pressure, the medium in the clamping groove 41 is sucked into the lower cavity 712 along the air channel 81; the clamping block 42 moves along the clamping groove 41 to approach the bottom of the clamping groove 41 under the action of negative pressure; in order to improve the resetting effect of the clamping block 42, a connecting tension spring 44 can be arranged between the clamping block 42 and the bottom of the clamping groove 41; after the clamping block 42 is retracted into the clamping groove 41, the annular film material remaining in the ring groove 5 falls under its own gravity or falls under manual stirring.

[0055] Embodiment 2, the embodiment is compared with embodiment 1, the difference is that:

[0056] The side wall of the rectangular rod 6 is horizontally provided with an upper turning groove 61 and a lower turning groove 62; the upper turning groove 61 is located above the ring shell 7; the lower turning groove 62 is located below the ring shell 7; the upper turning groove 61 and the lower turning groove 62 are communicated through a vertical groove 63; the upper turning groove 61 is rotatably connected with an upper roller 64; the lower turning groove 62 is rotatably connected with a lower roller 65; one end of the lower roller 65 extends to the outside of the ring shell 7 and is fixedly connected with a crank 9; the upper end of the ring shell 7 is fixedly connected with a pull rope 75, the other end of the pull rope 75 passes through the upper roller 64 and is wound on the lower roller 65 after passing through the vertical groove 63; the groove bottom of the clamping groove 41 and the clamping block 42 are connected through a tension spring 44;

[0057] In use, when it is needed to control the ring shell 7 to move upwards along the outer wall of the rectangular rod 6, only the crank 9 needs to be rotated forward, the crank 9 will drive the lower roller 65 to rotate in the rotating process, the rotating lower roller 65 will wind the other end of the pull rope 75, so as to drive the ring shell 7 to move upwards through the pull rope 75, compared with directly lifting the ring shell 7, the lifting of the ring shell 7 is not limited, which facilitates the operation, and when it is needed to control the ring shell 7 to move downwards, only the crank 9 needs to be rotated reversely, the upward movement of the ring shell 7 will make the space of the lower cavity 712 smaller, the medium in the clamping groove 41 needs to overcome the tension of the tension spring 44 to drive the clamping block 42 to move away from the groove bottom of the clamping groove 41, so that the movement amplitude of the clamping block 42 is gradual, so as to avoid the situation that the clamping block 42 suddenly clamps the annular film material to cause the annular film material to be clamped and broken, and after the ring shell 7 moves downwards and the push rod 73 abuts against the upper end of the die a, the clamping block 42 will reset under the double actions of the tension spring 44 and the medium negative pressure, so that the clamping block 42 can be completely retracted into the clamping groove 41.

[0058] In the embodiment, the crank 9 is composed of a crank rod 91, a crank disc 92 and a crank head 93 which are connected in sequence; the crank rod 91 is connected with the lower roller 65; a locking sleeve 94 is slidably connected on the crank rod 91; the locking sleeve 94 and the crank disc 92 are connected through a second spring 95; the second spring 95 is sleeved on the crank rod 91; a locking ring 96 is arranged between the locking sleeve 94 and the rectangular rod 6; the locking ring 96 is sleeved on the outer wall of the crank rod 91 and is fixedly connected with the rectangular rod 6; one side of the locking ring 96 and the locking sleeve 94 is one-way meshed; a first one-way tooth is arranged on the side of the locking ring 96 close to the locking sleeve 94; a second one-way tooth is arranged on the side of the locking sleeve 94 close to the locking ring 96; the first one-way tooth and the second one-way tooth are one-way meshed; the cross section of the crank rod 91 is square; the locking ring 96 is rotatably connected with the crank rod 91;

[0059] When in use, the staff needs to control the ring shell 7 to move upwards, rotates the handle 93 to drive the swing plate 92 and the swing rod 91 to rotate, the swing rod 91 will drive the locking sleeve 94 to rotate synchronously, the locking sleeve 94 will drive the second one-way tooth to extrude the second spring 95 under the action of the first one-way tooth on the locking ring 96, with the locking sleeve 94 being extruded to move close to the swing plate 92, so that the locking sleeve 94 and the locking ring 96 will not mesh, when the staff stops swinging the handle 9, the ring shell 7 will give the tension spring 44 a downward pulling force, thereby giving the lower roller 65 and the swing rod 91 a reverse rotating force through the pull rope 75, because the second one-way tooth on the locking sleeve 94 is in contact with and meshes with the first one-way tooth on the locking ring 96 under the action of the second spring 95, so that the swing rod 91 cannot rotate, achieving the purpose of locking the ring shell 7, so that the staff can stop moving at any time during the movement of the ring shell 7; when the staff needs to control the ring shell 7 to move downwards, only needs to move the locking sleeve 94 away from the locking ring 96 and extrude the second spring 95, so that the locking sleeve 94 and the locking ring 96 are disengaged, so that the ring shell 7 can move downwards under the action of its own gravity, when the staff releases the locking sleeve 94, the locking sleeve 94 and the locking ring 96 are re-engaged under the action of the second spring 95.

[0060] Embodiment 3, the difference between this embodiment and embodiment 1 is:

[0061] The rectangular rod 6 is fixedly connected with the clamping seat 66 on the outer wall and close to the die a; the lower end of the clamping seat 66 is provided with a circular groove 67; the clamping block 68 is slidably connected in the circular groove 67; the clamping block 68 and the groove bottom of the circular groove 67 are connected through the third spring 69; the end of the clamping block 68 away from the groove bottom of the circular groove 67 is provided with a chamfer; the upper end of the die a is provided with two clamping grooves a1; one of the clamping grooves a1 is aligned with the circular groove 67 after corresponding to the ring groove 5 and the annular discharge port;

[0062] When using, before discharging from the annular discharge port on the die a, the annular shell is first moved up, then the rectangular rod 6 is rotated to drive the clamping seat 66 to rotate synchronously, the clamping seat 66 drives the circular groove 67 to rotate synchronously during the rotation, after the circular groove 67 corresponds to one of the clamping grooves a1, the third spring 69 will extrude the clamping block 68, so that the clamping block 68 is clamped into one of the clamping grooves a1, at this time the annular groove 5 corresponds to the annular discharge port, because the clamping block 68 is clamped into one of the clamping grooves a1, so that the annular groove 5 will not appear dislocation during the discharging process of the annular discharge port, greatly improving the stability of the annular discharge port into the annular groove 5; when the inner disc 1 and the outer ring 4 need to be controlled to rotate away from the annular discharge port directly above, only need to reverse rotate the clamping seat 66, the clamping seat 66 drives the clamping block 68 to move synchronously during the rotation around the rectangular rod 6, because one end of the clamping block 68 is provided with a chamfer, so that the clamping block 68 is separated from one of the clamping grooves a1 under the action of the chamfer and overcomes the third spring 69 to retract into the circular groove 67, until the circular groove 67 corresponds to the other clamping groove a1, the third spring 69 drives the clamping block 68 into the other clamping groove a1, realizing the locking of the rectangular rod 6, avoiding the situation that the rectangular rod 6 drives the inner disc 1 and the outer ring 4 to shake disorderly.

[0063] In the embodiment, the inner disc 1 is provided with a first hole 13 at the lower end; the other end of the first hole 13 passes through the connecting block 43 and the connecting rod 8 to communicate with the upper cavity 711; the gas outlet direction of the first hole 13 is multiple;

[0064] When using, the staff rotates the rectangular rod 6 to drive the inner disc 1 to move from the outside of the die a to the center of the die a, then the annular shell 7 falls, the falling annular shell 7 drives the inner disc 1 to move downward synchronously, when the push rod 73 is blocked by the upper end of the die a, the space of the upper cavity 711 becomes smaller, the gas in the upper cavity 711 is extruded to be discharged along the first hole 13, the gas outlet direction of the first hole 13 is multiple, the impurities around the annular discharge port of the die a are blown away under the action of the gas discharged from the first hole 13, ensuring the cleanliness of the upper end of the die a, avoiding the impurities being stuck between the upper end of the die a and the lower end of the inner disc 1, causing the annular groove 5 and the annular discharge port to be unable to be closely aligned, finally under the condition that the inner disc 1 closely adheres to the upper end of the die a, the annular discharge port will extrude the annular film material into the annular groove 5, and the gas generated on the inside of the annular discharge port of the die a is discharged along the gas outlet hole 11, after the annular shell 7 moves up, the clamping block 42 clamps the annular film material, the sealing disc 3 seals the gas outlet hole 11 as the annular shell 7 continues to move up, the pressure between the inner disc 1 and the upper end of the die a increases when the gas cannot be discharged, the gas enters the upper cavity 711 along the first hole 13, thereby giving the piston 72 a downward force, so that the medium in the lower cavity 712 has a greater force to clamp the annular film material through the clamping block 42, thereby making the annular film material not easy to separate from the annular groove 5 during the film drawing process, improving the film drawing stability.

[0065] Example 4, which differs from example 1 in that:

[0066] The lower end of the slide rod 2 is provided with a groove 21; the groove 21 is slidably connected with a slide bar 22; the slide bar 22 is connected with the groove bottom of the groove 21 through a No. 4 spring 23; the groove wall of the groove 21 and the outer wall of the slide rod 2 are provided with a No. 1 rectangular groove 24; the No. 1 rectangular groove 24 is slidably connected with a locking block 25; the outer wall of the slide bar 22 close to the No. 1 rectangular groove 24 is provided with a triangular groove 26; the locking block 25 is slidably connected with the inclined surface of the triangular groove 26; the slide hole 12 is provided with a No. 2 rectangular groove 14 at the position corresponding to the No. 1 rectangular groove 24;

[0067] In use, the inner disc 1 is driven to move upwards and will produce relative motion with the sealing disc 3, after the upper end of the inner disc 1 contacts with the lower end of the sealing disc 3, the No. 2 rectangular groove 14 corresponds to the position of the No. 1 rectangular groove 24, then the inner disc 1 drives the sealing disc 3 to continue to move upwards, the sealing disc 3 drives the slide rod 2 to move upwards, at the same time, the No. 4 spring 23 pushes the slide bar 22 away from the groove bottom of the groove 21, the slide bar 22 will produce relative sliding with the locking block 25 through the triangular groove 26 during the movement, the locking block 25 is extruded by the triangular groove 26 and slides along the No. 1 rectangular groove 24 and enters the No. 2 rectangular groove 14, realizing the locking of the slide rod 2, so as to realize the sealing of the air outlet hole 11 by the sealing disc 3, so that the sealing disc 3 will not be pushed open under the condition that the gas pressure below the inner disc 1 increases, improving the sealing stability; during the process that the inner disc 1 approaches the upper end of the die a, the inner disc 1 drives the slide rod 2 and the slide bar 22 to move downwards synchronously, after the slide bar 22 contacts and is extruded by the upper end of the die a, the slide bar 22 drives the locking block 25 to retract from the No. 1 rectangular groove 24 to the No. 2 rectangular groove 14 through the upward movement of the triangular groove 26, realizing the unlocking of the slide rod 2, so that the inner disc 1 continues to move downwards under the condition that the sealing disc 3 is stationary, realizing the separation of the inner disc 1 and the sealing disc 3, and the air outlet hole 11 is opened.

[0068] In this embodiment, the lower end surface of the slide rod 2 is inlaid with a No. 1 magnet 27; the position corresponding to the slide bar 22 of the upper end of the die a is inlaid with a No. 2 magnet a2; the No. 1 magnet 27 and the No. 2 magnet a2 are magnetically opposite; the No. 1 rectangular groove 24 is annular;

[0069] During use, since the magnets 1 and 2 have opposite magnetic properties, they attract each other, causing the lower end of the slider 2 to be held tightly against the upper end of the mold head a. This also causes the slider 22 inside the slider 2 to be squeezed by the upper end of the mold head a, thus causing the locking block 25 to retract into the second rectangular groove 14. In this way, the inner plate 1 can move upward without obstruction and achieve alignment between the second rectangular groove 14 and the first rectangular groove 24. Under the combined effect of the gravity of the sealing plate 3 and the slider 2 and the magnetic attraction, the gas discharged from the vent 11 will not cause the sealing plate 3 to move upward, thus ensuring that the inner plate 1 can move upward stably and contact the sealing plate 3, improving the stability of the sealing of the vent 11. The first rectangular groove 24 is annular, so that the locking block 25 can still be inserted into the first rectangular groove 24 after radial rotation.

[0070] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the appendix. Figure 1 The orientations or positional relationships shown are for the convenience of describing the present invention and simplifying the description only, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and should not be construed as indicating or implying relative importance.

[0071] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A five-layer co-extrusion blown film process of a composite film, characterized in that: Comprise the following steps: S1: first start five extruders according to the composition of each layer requirements respectively feeding, raw material particles in the heating equipment heating melting cooperation extruder extruded into the die (a), and along the die (a) annular discharge port discharge; S2: the annular discharge port discharged into the ring groove (5) in the film assembly, clamping block (42) will be under the action of medium pressure along the clamping groove (41) and close to the inner disc (1) outer wall movement, will be ring film material clamped between the clamping block (42) and the inner disc (1), then the staff control the film assembly up, the film assembly up will evenly pull the ring film material; S3: the inner disc (1) in the film assembly up a distance after contact with the sealing disc (3), the ring film material in the die (a) center discharge gas under the action of being opened, then the staff will tear the ring film material close to the ring groove (5) part and polymerization into strip, then the ring film material through the traction roller is wound on the winding roller is wound; Wherein, the film assembly used in S2-S3 comprises: Inner disc (1); the upper end of the inner disc (1) is provided with gas hole (11) and sliding hole (12); Slide bar (2); the slide bar (2) is connected with the sliding hole (12); the length of the slide bar (2) is higher than the thickness of the inner disc (1); Sealing disc (3); the sealing disc (3) is located above the inner disc (1), and is connected with the slide bar (2); the vertical projection plane of the sealing disc (3) covers the gas hole (11); Outer ring (4); the outer ring (4) is sleeved on the outer side of the inner disc (1), and is concentric with the inner disc (1); the inner wall of the outer ring (4) is uniformly provided with clamping groove (41); the clamping groove (41) is connected with clamping block (42) slidingly; the clamping groove (41) groove bottom is connected with medium source; the outer ring (4) and the inner disc (1) form a ring groove (5); the upper end of the outer ring (4) is connected with the upper end of the inner disc (1) through the connecting block.

2. A five-layer co-extrusion blown film process of a composite film as claimed in claim 1, wherein: The outer side of the outer ring (4) is vertically provided with rectangular rod (6); the rectangular rod (6) is rotatably connected to the upper end of the die (a); the outer wall of the rectangular rod (6) is slidingly connected with the ring shell (7); the ring shell (7) is provided with ring cavity (71) in it; the piston (72) is slidingly and sealingly connected in the ring cavity (71); the piston (72) divides the ring cavity (71) into upper cavity (711) and lower cavity (712); the lower end of the piston (72) is fixedly connected with the push rod (73); the push rod (73) passes through the ring shell (7) and is slidingly and sealingly connected with the ring shell (7); the piston (72) and the upper wall of the upper cavity (711) are connected through the first spring (74); the push rod (73) abuts against the upper end of the die (a) in the initial state; one of the connecting blocks and the ring shell (7) are connected through the connecting rod (8); the connecting rod (8) is provided with air channel (81); one end of the air channel (81) communicates with the lower cavity (712), and the other end communicates with the groove bottom of the clamping groove (41).

3. A five-layer co-extrusion blown film process of a composite film as claimed in claim 2, wherein: The upper and lower turning grooves (61) and (62) are horizontally arranged through the side wall of the rectangular rod (6); the upper turning groove (61) is above the ring shell (7); the lower turning groove (62) is below the ring shell (7); the upper turning groove (61) and the lower turning groove (62) are communicated through the vertical groove (63); the upper roller (64) is rotatably connected in the upper turning groove (61); the lower roller (65) is rotatably connected in the lower turning groove (62); one end of the lower roller (65) extends to the outside of the ring shell (7) and is fixedly connected with the handle (9); the upper end of the ring shell (7) is fixedly connected with the pull rope (75), the other end of the pull rope (75) passes through the upper roller (64), passes through the vertical groove (63) and is wound on the lower roller (65); the groove bottom of the clamping groove (41) and the clamping block (42) are connected through the tension spring (44).

4. A five-layer co-extrusion blown film process of a composite film as claimed in claim 3, wherein: The handle (9) is composed of a rocking rod (91), a rocking disc (92) and a rocking head (93) which are connected in sequence; the rocking rod (91) is connected with the lower roller (65); the rocking rod (91) is slidably connected with the locking sleeve (94); the locking sleeve (94) and the rocking disc (92) are connected through the second spring (95); the locking sleeve (94) and the rectangular rod (6) are provided with the locking ring (96); the locking ring (96) is sleeved on the outer wall of the rocking rod (91) and is fixedly connected with the rectangular rod (6); the locking ring (96) and the locking sleeve (94) are unidirectionally engaged on the side close to each other; the cross section of the rocking rod (91) is square.

5. A five-layer co-extrusion blown film process of a composite film as claimed in claim 2, wherein: The rectangular rod (6) is fixedly connected with the clamping seat (66) at the position close to the die head (a) on the outer wall; the lower end of the clamping seat (66) is provided with a circular groove (67); the clamping block (68) is slidably connected in the circular groove (67); the clamping block (68) and the groove bottom of the circular groove (67) are connected through the third spring (69); the end of the clamping block (68) away from the groove bottom of the circular groove (67) is provided with a chamfer; the upper end of the die head (a) is provided with two clamping grooves (a1); one of the clamping grooves (a1) is aligned with the circular groove (67) after corresponding to the ring groove (5) and the annular discharge port.

6. A five-layer co-extrusion blown film process of a composite film as claimed in claim 2, wherein: The inner disc (1) is provided with a first hole (13) at the lower end; the other end of the first hole (13) is communicated with the upper cavity (711) after passing through the connecting block and the connecting rod (8).

7. A five-layer co-extrusion blown film process of a composite film as claimed in claim 1, wherein: The lower end of the sliding rod (2) is provided with a groove (21); the sliding bar (22) is slidably connected in the groove (21); the sliding bar (22) and the groove bottom of the groove (21) are connected through the fourth spring (23); the groove wall of the groove (21) and the outer wall of the sliding rod (2) are provided with a first rectangular groove (24) through; the locking block (25) is slidably connected in the first rectangular groove (24); the outer wall of the sliding bar (22) close to the first rectangular groove (24) is provided with a triangular groove (26); the locking block (25) is slidably connected on the inclined surface of the triangular groove (26); the second rectangular groove (14) is arranged at the position corresponding to the first rectangular groove (24) of the sliding hole (12).

8. A five-layer co-extrusion blown film process of a composite film as claimed in claim 7, wherein: The lower end surface of the slide bar (2) is inlaid with a first magnet (27); the upper end of the die head (a) is inlaid with a second magnet (a2) at a position corresponding to the slide bar (22); the first magnet (27) and the second magnet (a2) are magnetically opposite; and the first rectangular groove (24) is annular.

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