A spiral extrusion device and process for producing a breathable film

Abstract

The present invention relates to the technical field of breathable film preparation, and discloses a spiral extrusion device and process for breathable film production, including an extrusion mechanism, a cabinet door, a controller, a machine table, and a feed cylinder for the entry of plastic particles. In the present invention, air bubbles are extruded by a screw rod at a certain pressure within a square gap in the middle of a forming rod, so that the air bubbles in the plastic particle colloid push the force-receiving rod to elastically shake the rubber block under the extrusion pressure. When shaking, the sponge ring generates a change in gap, enabling the air bubbles to deflate from the position of the gap change in the sponge ring. Thus, while isolating the plastic particle colloid from being discharged, it facilitates the discharge of air bubbles, preventing holes from successfully appearing when the plastic particle colloid is formed and cooled, which affects its integrity. Moreover, by protruding the protruding tube from the inner wall of the melting cylinder, the plastic particles closer to the central axis in the middle of the melting cylinder are melted at a high temperature, preventing the plastic particles closer to the middle of the melting cylinder from being incompletely melted, and avoiding differences in fluidity among the melted plastic particle colloids.

Description

Technical Field

[0001] The present invention relates to the technical field of breathable film preparation, specifically a spiral extrusion device and process for breathable film production. Background Art

[0002] The working principle of a spiral extrusion device can be divided into four steps: feeding, melting, extrusion, and cooling. First, plastic particles are fed into the feeding section of the screw cavity through the feeding system. Then, the screw rotates at a high speed, pushing the plastic particles into the mixing and conveying area and melting them by contacting the heater. The melted plastic particle colloid is pushed towards the die area. After being restricted by the shape of the die, the melted plastic particle colloid is extruded under pressure to form a plastic product with the required shape and thickness. Finally, the product is cut or wound up after cooling.

[0003] However, during the heating and melting process of plastic particles, the heaters are mainly distributed on the inner wall of the cavity. Some plastic particles do not contact the inner wall, and melting mainly relies on heat transfer after the inner wall is heated. There is a distance between the inner wall and the plastic particles near the middle, and it takes longer to melt the plastic particles near the middle compared to those in contact with the inner wall. Thus, by conduction, the plastic particles near the middle are melted, which easily leads to differences in fluidity among the melted plastic particle colloids, affecting the mixing and extrusion. Moreover, although some gas is discharged during the melting and rotation process, during extrusion, the tumbling of the melted plastics creates gaps to form gas storage spaces, and small pores are easily formed after cooling, affecting the integrity of the breathable film. Summary of the Invention

[0004] The present invention provides a spiral extrusion device and process for breathable film production, which overcomes the deficiencies described in the background art.

[0005] The technical solution adopted by the present invention to solve its technical problems is as follows:

[0006] A spiral extrusion device for breathable film production, comprising an extrusion mechanism, a cabinet door, a controller, a machine table, and a feeding cylinder for plastic particles to enter. The controller is fixed on the upper end of the machine table. The extrusion mechanism is horizontally arranged on the upper end of the machine table. The controller is electrically connected and controls the internal rotation of the extrusion mechanism. The cabinet door is arranged on the side of the machine table. The feeding cylinder is arranged at the right end opening of the extrusion mechanism.

[0007] A cooling mechanism is provided at the left end of the extrusion mechanism. The cooling mechanism includes a hollow channel, a forming rod, a guiding plate, a screw rod, and a discharging mechanism. The right end of the guiding plate rotates inside the forming rod. The hollow channel is arranged around the inside of the forming rod. A cooler is provided at the upper end of the forming rod, and the cold air flowing out of the cooler is introduced into the hollow channel. The screw rod is threadedly movable inside the forming rod and pushes the guiding plate to rotate. The discharging mechanism is engaged inside the guiding plate. The middle of the forming rod has a square gap, and the screw rod pushes the guiding plate to rotate and narrow the square gap. The discharging mechanism evenly contacts the plastic particle colloid in the square gap.

[0008] A motor, a spiral rod, a fitting block, a feeding pipe, a hot melting structure, and a melting cylinder are provided at the right end of the extrusion mechanism. The fitting block is arranged between the melting cylinder and the cooling mechanism. The spiral rod passes through the melting cylinder and is connected to the output end of the motor. The motor drives the spiral rod to rotate. The feeding cylinder is connected to the feeding pipe corresponding to the upper end of the melting cylinder, and plastic particles enter from the feeding pipe. There are three hot melting structures, which are arranged equidistantly inside the melting cylinder. The spiral rod is provided with an arc-shaped block corresponding to the fitting block, and there is an arc-shaped channel between the arc-shaped block and the fitting block. When the spiral rod rotates, the hot melting structure heats and melts the plastic particles into a colloid. The spiral rod pushes the plastic particle colloid to be guided from the melting cylinder to the arc-shaped channel, and the plastic particle colloid is extruded into the cooling mechanism for forming and cooling.

[0009] A preferred technical solution: The discharging mechanism is provided with a protruding rod, a hollow plate, and an air vent. The air vent is arranged on the lower side of the hollow plate. The protruding rods are evenly arranged on the upper side of the hollow plate. The hollow plate is engaged inside the guiding plate. The space from the air vent to the lower side of the guiding plate is hollow. The bubbles in the plastic particle colloid squeeze the protruding rod, and the gas enters the hollow plate and is discharged downward.

[0010] A preferred technical solution: The protruding rod is provided with a hollow tube, a connecting tube, and a stress rod. The connecting tube is arranged inside the hollow tube. Rubber blocks are provided on the left and right sides of the stress rod, and the rubber blocks are fixed inside the connecting tube. A sponge ring is arranged between the inside of the connecting tube and the stress rod. When the plastic particle colloid is extruded, it pushes the stress rod 513 to swing under the elasticity of the rubber block, and the bubbles enter the lower part of the connecting tube 512 through the sponge ring.

[0011] A preferred technical solution: The hot melting structure is provided with a heating ring, a drainage tube, and a protruding tube. The drainage tube is connected to the lower end of the heating ring. The drainage tube and the heating ring are fixed inside the melting cylinder. The protruding tubes are all arranged inside the heating ring. The protruding tubes protrude from the inner wall of the melting cylinder. The two vertices of adjacent protruding tubes are inclined along the inclination angle of the spiral rod.

[0012] A preferred technical solution: A hot air heater is provided inside the machine table. The lower ends of the three heat melting structures are respectively connected to the output end of the hot air heater inside the machine table. The controller controls the hot air heater by electrical signals, and makes the hot air heater blow hot air into the heat melting structure to heat and melt the inner wall of the cylinder.

[0013] Based on the above process of the screw extrusion equipment for producing breathable membranes, the specific process includes the following steps:

[0014] S1: Plastic particles are added to the feeding cylinder and fall from the feeding pipe to the right side inside the melting cylinder. The controller is electrically connected to the motor and drives the motor to rotate the screw rod, so that the screw rod guides the plastic particles on the right side of the melting cylinder to the left side. During the guiding process, the plastic particles are heated by the hot air of the heat melting structure to form a plastic particle colloid, and the plastic particle colloid is extruded and formed from the arc-shaped channel formed by the arc-shaped block and the fitting block to the cooling mechanism.

[0015] S2: After the plastic particle colloid enters the cooling mechanism, the rotating screw rod pushes the guiding plate to rotate, and makes the plastic particle colloid extrude within the square gap in the middle of the forming rod.

[0016] S3: The plastic particle colloid contacts the discharging mechanism within the square gap, and makes the air bubbles in the plastic particle colloid enter the protruding rod. The plastic particle colloid makes the stress rod shake under the extrusion pressure, and makes the gap of the sponge ring change. The air bubbles are discharged into the hollow plate within the sponge ring under the pressure.

[0017] S4: After the air bubbles are discharged by the discharging mechanism, the cold air discharged by the cooler forms cooling on the inner wall of the square gap at the hollow channel position, and makes the plastic particle colloid cool and form.

[0018] Compared with the prior art, this technical solution has the following advantages:

[0019] In the present invention, the air bubbles in the plastic particle colloid are extruded by the screw rod at a certain pressure within the square gap in the middle of the forming rod. Thus, the air bubbles in the plastic particle colloid push the stress rod to elastically shake the rubber block under the extrusion pressure, and make the stress rod squeeze the sponge ring. When shaking, the gap of the sponge ring changes. Under the pressure of the plastic particle colloid, the air bubbles will produce a deflating effect from the position where the gap of the sponge ring changes. Thus, while isolating the plastic particle colloid from being discharged through the sponge ring, it is convenient for the air bubbles to be discharged, preventing holes from successfully appearing when the plastic particle colloid cools and forms, which affects the integrity.

[0020] When the plastic particles in the present invention are melted by the heat of the hot-melt structure on the inner wall of the melting cylinder, the hot air generated by the heater heats the inner wall of the melting cylinder through the heating ring, and the protruding tube extends close to the screw rod. The hot air enters the inside of the protruding tube and heats its outside, so that the plastic particles inside the melting cylinder are melted by contacting the outside of the protruding tube. By protruding the protruding tube from the inner wall of the melting cylinder, the plastic particles closer to the central axis in the middle of the melting cylinder are melted at a high temperature, preventing the plastic particles closer to the middle of the melting cylinder from being incompletely melted and avoiding differences in the fluidity between the melted plastic particle colloids. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below in conjunction with the drawings and embodiments.

[0022] Figure 1 It is the overall view of the present invention.

[0023] Figure 2 It is a side schematic view of the extrusion mechanism.

[0024] Figure 3 It is a side schematic view of the cooling mechanism.

[0025] Figure 4 It is a three-dimensional schematic view of the discharge mechanism.

[0026] Figure 5 It is a three-dimensional schematic view of the protruding rod.

[0027] Figure 6 It is a three-dimensional schematic view of the hot-melt structure.

[0028] In the figure: feeding cylinder - 1, extrusion mechanism - 2, cabinet door - 3, controller - 4, machine table - 5, cooling mechanism - 21, motor - 22, screw rod - 23, fitting block - 24, feeding pipe - 25, hot-melt structure - 26, melting cylinder - 27, hollow channel - 211, forming rod - 212, guiding plate - 213, screw - 214, discharge mechanism - 215, protruding rod - 51, hollow plate - 52, air vent - 53, hollow tube - 511, connecting pipe - 512, stress rod - 513, heating ring - 261, drainage pipe - 262, protruding tube - 263. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] As Figures 1 to 6 shown, a spiral extrusion device for producing a breathable film is proposed in the present invention, including an extrusion mechanism 2, a cabinet door 3, a controller 4, a machine table 5, and a feeding cylinder 1 for plastic particles to enter. The controller 4 is fixed on the upper end of the machine table 5. The extrusion mechanism 2 is horizontally arranged on the upper end of the machine table 5. The controller 4 is electrically connected to and controls the rotation inside the extrusion mechanism 2. The cabinet door 3 is arranged on the side of the machine table 5. The feeding cylinder 1 is arranged at the right end opening of the extrusion mechanism 2;

[0030] A cooling mechanism 21 is provided at the left end of the extrusion mechanism 2. The cooling mechanism 21 includes a hollow channel 211, a forming rod 212, a guiding plate 213, a screw rod 214, and a discharging mechanism 215. The right end of the guiding plate 213 rotates inside the forming rod 212. The hollow channel 211 is arranged around the inside of the forming rod 212. A cooler is provided at the upper end of the forming rod 212, and the cold air flowing out of the cooler is introduced into the hollow channel 211. The screw rod 214 is threadedly movable inside the forming rod 212 and pushes the guiding plate 213 to rotate. The discharging mechanism 215 is engaged inside the guiding plate 213. The middle of the forming rod 212 has a square gap. The screw rod 214 pushes the guiding plate 213 to rotate and narrow the square gap. The discharging mechanism 215 evenly contacts the plastic particle colloid in the square gap.

[0031] A motor 22, a spiral rod 23, a fitting block 24, a feeding pipe 25, a hot-melting structure 26, and a melting cylinder 27 are provided at the right end of the extrusion mechanism 2. The fitting block 24 is arranged between the melting cylinder 27 and the cooling mechanism 21. The spiral rod 23 passes through the melting cylinder 27 and is connected to the output end of the motor 22. The motor 22 drives the spiral rod 23 to rotate. The feeding cylinder 1 is connected to the feeding pipe 25 corresponding to the upper end of the melting cylinder 27, and plastic particles enter from the feeding pipe 25. There are three hot-melting structures 26, which are arranged equidistantly inside the melting cylinder 27. The spiral rod 23 is provided with an arc-shaped block corresponding to the fitting block 24, and there is an arc-shaped channel between the arc-shaped block and the fitting block 24. When the spiral rod 23 rotates, the hot-melting structure 26 heats and melts the plastic particles into a colloid. The spiral rod 23 pushes the plastic particle colloid from the melting cylinder 27 towards the arc-shaped channel and squeezes the plastic particle colloid into the cooling mechanism 21 for shaping and cooling.

[0032] Among them, the discharging mechanism 215 is provided with a protruding rod 51, a hollow plate 52, and an air vent 53. The air vent 53 is arranged on the lower side of the hollow plate 52. The protruding rods 51 are evenly arranged on the upper side of the hollow plate 52. The hollow plate 52 is engaged inside the guiding plate 213. The space from the air vent 53 to the lower side of the guiding plate 213 is hollow. The bubbles in the plastic particle colloid squeeze the protruding rod 51, and the gas enters the hollow plate 52 and is discharged downward.

[0033] Moreover, the diameter of the right side of the spiral rod 23 is smaller, and the diameter of the left side of the spiral rod 23 is larger. When the spiral rod 23 rotates counterclockwise, the spiral plate provided on the outer side of the spiral rod 23 pushes the plastic particles in the melting cylinder 27 towards the fitting block 24 for extrusion and pushing.

[0034] Moreover, a rubber material is provided between the guiding plate 213 and the forming rod 212. When the guiding plate 213 rotates, the guiding plate 213 squeezes the rubber material, and the cold air in the hollow channel 211 is transmitted to the inner walls of the guiding plate 213 and the forming rod 212, so that the plastic particle colloid in the square gap is cooled and formed.

[0035] Moreover, a rotating rod is provided at the right end of the guiding plate 213 and connected inside the forming rod 212. The screw rod 214 is provided with a bearing. The upper end of the bearing is made of rubber and connected to the guiding plate 213. When the screw rod 214 rotates, the bearing rotates and pushes the guiding plate 213 to tilt and rotate around the rotating rod, thereby driving the rotation of the guiding plate 213 and adjusting the square gap above the guiding plate 213, facilitating the adjustment of the thickness of the plastic particle colloid extruded and formed within the square gap.

[0036] Wherein, the protruding rod 51 is provided with a hollow tube 511, a connecting tube 512 and a stress rod 513. The connecting tube 512 is arranged inside the hollow tube 511. Rubber blocks are provided on the left and right sides of the stress rod 513 and fixed inside the connecting tube 512. A sponge ring is arranged between the inside of the connecting tube 512 and the stress rod 513. When the plastic particle colloid is extruded, it pushes the stress rod 513 to swing under the elasticity of the rubber blocks, and enables air bubbles to enter below the connecting tube 512 through the sponge ring.

[0037] Moreover, under the pressure of the plastic particle colloid extrusion, the stress rod 513 shakes and squeezes the sponge ring. At this time, pressure leakage occurs at the position of the sponge ring. Thus, the air bubbles in the plastic particle colloid are discharged from the position of the sponge ring, and are blocked by the sponge ring to prevent the plastic particle colloid from being discharged together, achieving the exhaust effect.

[0038] Moreover, after the extrusion mechanism 2 stops operating, the plastic particle colloid no longer extrudes from the square gap. At this time, part of the plastic particle colloid will solidify on the upper surfaces of the connecting tube 512 and the sponge ring. When the extrusion mechanism 2 operates, the plastic particle colloid extrudes from the square gap again. At this time, the plastic particle colloid pushes the stress rod 513 to swing with the rubber blocks as the support. Furthermore, the stress rod 513 breaks the solidified plastic particle colloid on the upper surfaces of the connecting tube 512 and the sponge ring by external force, enabling the broken solid plastic particle colloid to blend into the subsequent plastic particle colloid entering, realizing the multiple use of the protruding rod 51.

[0039] Wherein, the hot melting structure 26 is provided with a heating ring 261, a drainage tube 262 and a protruding tube 263. The drainage tube 262 is connected to the lower end of the heating ring 261. The drainage tube 262 and the heating ring 261 are fixed inside the melting cylinder 27. The protruding tubes 263 are all arranged inside the heating ring 261. The protruding tubes 263 protrude from the inner wall of the melting cylinder 27. The two vertices of adjacent protruding tubes 263 are inclined along the inclination angle of the spiral rod 23.

[0040] Wherein, a hot air blower is arranged inside the machine table 5. The lower ends of the three hot melting structures 26 are respectively connected to the output end of the hot air blower inside the machine table 5. The controller 4 controls the hot air blower by electrical signals and enables the hot air blower to blow hot air into the hot melting structure 26 to heat the inner wall of the melting cylinder 27.

[0041] Moreover, there are two drain pipes 262. One of them discharges hot air, and the other discharges hot air. The discharge volume of the drain pipe 262 discharging hot air will change under pressure. After the drain pipe 262 discharges hot air into the heating ring 261, the hot air fills the heating ring 261 and the protruding pipe 263. Under the condition of the hot air filling, a certain pressure is generated. The hot air is discharged from the other drain pipe 262 under a certain pressure, ensuring the stability of the hot air pressure inside the heating ring 261 and making the heat transferred to the protruding pipe 263 and the inner wall of the melting cylinder 27 remain stable.

[0042] In the present invention, after the plastic particles enter the melting cylinder 27 from the feeding cylinder 1 through the feeding pipe 25, the controller 4 controls the motor 22 to rotate the screw rod 23, and the plastic particles on the right side of the melting cylinder 27 are rotated and pushed by the screw rod 23 to the fitting block 24. During the pushing process of the plastic particles, they are melted by the high temperature generated by the hot melting structure 26 to form a plastic particle colloid. Under the rotational extrusion pressure of the screw rod 23, the plastic particle colloid is guided to the cooling mechanism 21 for forming at the fitting block 24. During the forming process, the plastic particle colloid contacts the discharging mechanism 215, so that the gap bubbles generated by rotation in the plastic particle colloid are led out by the discharging mechanism 215. During the leading-out process, the bubbles are extruded by the screw rod 23 under a certain pressure in the square gap in the middle of the forming rod 212. Thus, the bubbles in the plastic particle colloid push the force-bearing rod 513 to elastically shake the rubber block under the extrusion pressure, and the force-bearing rod 513 squeezes the sponge ring. When shaking and squeezing, the sponge ring generates a gap change. Under the pressure of the plastic particle colloid, the bubbles will produce a deflating effect from the gap change position of the sponge ring, so as to isolate the plastic particle colloid from discharging while facilitating the discharge of the bubbles, and prevent holes from successfully appearing when the plastic particle colloid is formed and cooled, affecting the integrity.

[0043] In the present invention, when the plastic particles are melted by the heat of the hot melting structure 26 on the inner wall of the melting cylinder 27, the hot air generated by the heater heats the inner wall of the melting cylinder 27 through the heating ring 261, and the protruding pipe 263 extends close to the screw rod 23. The hot air enters the inside of the protruding pipe 263 and heats its outside. Thus, the plastic particles inside the melting cylinder 27 are melted by contacting the outside of the protruding pipe 263. By the protruding pipe 263 protruding from the inner wall of the melting cylinder 27, the plastic particles closer to the central axis in the middle of the melting cylinder 27 are melted at a high temperature, preventing the plastic particles closer to the middle of the melting cylinder 27 from being incompletely melted and avoiding differences in the fluidity between the melted plastic particle colloids.

[0044] Based on the above process of a screw extrusion device for producing breathable membranes, the specific process includes the following steps:

[0045] S1: Plastic particles are added to the feeding cylinder 1 and fall from the feeding pipe 25 to the right side inside the melting cylinder 27. The controller 4 is electrically connected to the motor 22 and drives the motor 22 to rotate the screw rod 23, causing the screw rod 23 to guide the plastic particles on the right side of the melting cylinder 27 to the left. During the guiding process, the plastic particles are heated by the hot air of the hot melting structure 26 to form a plastic particle colloid, and the plastic particle colloid is extruded and formed through the arc-shaped channel formed by the arc-shaped block and the fitting block 24 to the cooling mechanism 21;

[0046] S2: After the plastic particle colloid enters the cooling mechanism 21, the rotating screw 214 pushes the guide plate 213 to rotate, and causes the plastic particle colloid to be extruded within the square gap in the middle of the forming rod 212;

[0047] S3: The plastic particle colloid contacts the discharging mechanism 215 within the square gap, and causes the air bubbles in the plastic particle colloid to enter the protruding rod 51. The plastic particle colloid causes the stress rod 513 to shake under the extrusion pressure, and causes the gap of the sponge ring to change. The air bubbles are discharged into the sponge ring under pressure and then into the hollow plate 52;

[0048] S4: After the air bubbles are discharged by the discharging mechanism 215, the cold air discharged by the cooler cools the inner wall of the square gap at the position of the hollow channel 211, and causes the plastic particle colloid to cool and form.

[0049] The above is only a preferred embodiment of the present invention, and thus the scope of implementation of the present invention cannot be limited thereby. That is, equivalent changes and modifications made according to the scope of the present invention patent and the content of the specification should still fall within the scope covered by the present invention.

Claims

1. A spiral extrusion device for producing a breathable membrane, characterized in that, It includes an extrusion mechanism, a cabinet door, a controller, a machine table, and a feed cylinder for plastic particles to enter. The controller is fixed at the upper end of the machine table. The extrusion mechanism is horizontally arranged at the upper end of the machine table. The controller is electrically connected to and controls the internal rotation of the extrusion mechanism. The cabinet door is arranged on the side of the machine table. The feed cylinder is arranged at the right-end opening of the extrusion mechanism. A cooling mechanism is provided at the left end of the extrusion mechanism. The cooling mechanism includes a hollow channel, a forming rod, a guiding plate, a screw, and a discharging mechanism. The right end of the guiding plate rotates inside the forming rod. The hollow channel is arranged around the inside of the forming rod. A cooler is provided at the upper end of the forming rod, and the cold air flowing out of the cooler is introduced into the hollow channel. The screw is threadedly movable inside the forming rod and pushes the guiding plate to rotate. The discharging mechanism is engaged inside the guiding plate. The middle of the forming rod has a square gap. The screw pushes the guiding plate to rotate and narrows the square gap. The discharging mechanism evenly contacts the plastic particle colloid in the square gap. A motor, a spiral rod, a fitting block, a feeding pipe, a hot-melting structure, and a melting cylinder are provided at the right end of the extrusion mechanism. The fitting block is arranged between the melting cylinder and the cooling mechanism. The spiral rod passes through the melting cylinder and is connected to the output end of the motor. The motor drives the spiral rod to rotate. The feed cylinder is connected to the feeding pipe corresponding to the upper end of the melting cylinder, and plastic particles enter from the feeding pipe. There are three hot-melting structures, which are arranged equidistantly inside the melting cylinder. The spiral rod is provided with an arc-shaped block corresponding to the fitting block, and there is an arc-shaped channel between the arc-shaped block and the fitting block. When the spiral rod rotates, the hot-melting structure heats the plastic particles into a colloid, and the spiral rod pushes the plastic particle colloid to be guided from the melting cylinder to the arc-shaped channel, and the plastic particle colloid is extruded into the cooling mechanism for shaping and cooling. The discharging mechanism is provided with a protruding rod, a hollow plate, and an air vent. The air vent is arranged on the lower side of the hollow plate. The protruding rods are evenly arranged on the upper side of the hollow plate. The hollow plate is engaged inside the guiding plate. The space from the air vent to the lower side of the guiding plate is hollow. The bubbles in the plastic particle colloid squeeze the protruding rods, and the gas enters the hollow plate and is discharged downward. The protruding rod is provided with a hollow tube, a connecting tube, and a stress rod. The connecting tube is arranged inside the hollow tube. Rubber blocks are provided on the left and right sides of the stress rod, and the rubber blocks are fixed inside the connecting tube. A sponge ring is arranged between the inside of the connecting tube and the stress rod. When the plastic particle colloid is extruded, it pushes the stress rod to swing under the elasticity of the rubber blocks, and the bubbles pass through the sponge ring and enter below the connecting tube.

2. The spiral extrusion device for producing a breathable film according to claim 1, characterized in that, The hot-melting structure is provided with a heating ring, a drainage tube, and a protruding tube. The drainage tube is connected to the lower end of the heating ring. The drainage tube and the heating ring are fixed inside the melting cylinder. The protruding tubes are all arranged inside the heating ring. The protruding tubes protrude from the inner wall of the melting cylinder. The two vertices of adjacent protruding tubes are inclined along the inclination angle of the spiral rod.

3. The spiral extrusion device for producing a breathable film according to claim 2, wherein, A hot air blower is arranged inside the machine table. The lower ends of the three hot-melting structures are respectively connected to the output end of the hot air blower inside the machine table. The controller electrically controls the hot air blower, and the hot air blower blows hot air into the hot-melting structure to heat the inner wall of the melting cylinder.

4. The process of a spiral extrusion device for producing a breathable film according to claim 3, characterized in that, Specific process It includes the following steps: S1: Plastic particles are added to the feed cylinder and fall from the feed pipe to the right side inside the melting cylinder. The controller is electrically connected to the motor and drives the motor to rotate the screw rod, so that the screw rod guides the plastic particles on the right side of the melting cylinder to the left. During the guiding process, the plastic particles are heated by the hot air of the hot melting structure to form a plastic particle colloid, and the plastic particle colloid is extruded and formed from the arc-shaped channel formed by the arc-shaped block and the mating block to the cooling mechanism; S2: After the plastic particle colloid enters the cooling mechanism, the rotating screw rod pushes the guide plate to rotate, and the plastic particle colloid is extruded within the square gap in the middle of the forming rod; S3: The plastic particle colloid contacts the discharge mechanism within the square gap, and the air bubbles in the plastic particle colloid enter the protruding rod. The plastic particle colloid makes the stress rod shake under the extrusion pressure, and changes the gap of the sponge ring. The air bubbles are discharged into the sponge ring and then to the hollow plate under pressure; S4: After the air bubbles are discharged by the discharge mechanism, the cold air discharged by the cooler cools the inner wall of the square gap at the hollow channel position, and the plastic particle colloid is cooled and formed.

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