Mini-screw extrusion apparatus for coating hot-melt adhesive film and coating method thereof

Abstract

The present application relates to a micro screw type extrusion equipment for coating hot melt adhesive film, comprising a screw, a cylinder, an extrusion die, the vertically arranged screw is coaxially arranged in the inner hole of the cylinder, and the extrusion die is arranged at the lower end of the cylinder; further comprising a cylinder connecting sleeve, an extruder feeding device, a screw driving device capable of driving the screw to rotate and move axially, a cutting assembly for rapidly cutting the hot melt adhesive extruded from the extrusion die; the cylinder connecting sleeve is sleeved on the outer wall surface of the upper section of the cylinder, the screw driving device is fixed at the top end of the cylinder connecting sleeve, the cutting assembly is fixed below the cylinder, the extruder feeding device is fixedly connected with the cylinder connecting sleeve, and the feeding outlet of the extruder feeding device is communicated with the inner hole of the cylinder. The present application also relates to a coating method of the micro screw type extrusion equipment for coating hot melt adhesive film. The present application has the advantages of compact structure, high efficiency, high automation degree and convenient industrial application, and belongs to the field of polymer material extrusion molding machinery.

Description

Technical Field

[0001] This invention relates to polymer material extrusion molding equipment, specifically to a micro screw extrusion device for coating hot melt adhesive films and the coating method thereof. Background Technology

[0002] Hot melt adhesive film is a solid film-type adhesive material made from thermoplastic resin or elastomer as a base, with added tackifiers, plasticizers, antioxidants, flame retardants, and fillers. After melting and mixing, it is extruded and cast into shape. Compared with traditional thermosetting, solvent-based, and water-based adhesives, it has many advantages, such as high bonding strength, environmental friendliness (no solvent pollution), good toughness, high elongation at break, and excellent resilience. It is widely used in industries such as wood, electronics, automotive interior manufacturing, and clothing and footwear materials.

[0003] Currently, the hot melt adhesive film bonding process mainly includes steps such as cutting, laying, and hot pressing. Taking the bonding of non-woven fabric to the surface of a shoe insole as an example, such as... Figure 1 As shown, firstly, a hot melt adhesive film matching the shape and size of the insole is cut according to its structural characteristics; then, the cut hot melt adhesive film and non-woven fabric are laid sequentially on the surface of the insole to be bonded, and hot pressing is performed. Under the action of hot pressing, the hot melt adhesive film melts and bonds the insole and non-woven fabric together; finally, after cooling and setting, the finished product is removed from the mold.

[0004] Clearly, traditional hot melt adhesive film bonding processes have some shortcomings. First, cutting a hot melt adhesive film that precisely matches the surface to be bonded is very complex and time-consuming, especially inefficient in mass production. Second, during the bonding process, the solid hot melt adhesive film needs to be reheated to melt and perform its adhesive function. However, the poor thermal conductivity of hot melt adhesive films means that the hot pressing process usually takes several minutes to fully melt, thus reducing bonding efficiency. Therefore, for industrial production, it is necessary to improve the hot melt adhesive film bonding process and increase automation to improve production efficiency and reduce costs. Summary of the Invention

[0005] The present invention aims to overcome the shortcomings of existing hot melt adhesive film bonding technology, such as complex process flow and low efficiency, and provides a micro screw extrusion device for coating hot melt adhesive film and its coating method for directly coating hot melt adhesive film on the surface of the target to be bonded.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A micro-screw extruder for coating hot melt adhesive films includes a screw, a barrel, and an extrusion die. The vertically positioned screw is coaxially arranged within the inner bore of the barrel, and the extrusion die is located at the lower end of the barrel. The micro-screw extruder also includes a barrel connecting sleeve, an extruder feeding device, a screw drive unit capable of driving the screw to rotate and move axially, and a cutting assembly for rapidly cutting the hot melt adhesive extruded from the extrusion die. The barrel connecting sleeve is fitted onto the outer wall of the upper section of the barrel. The screw drive unit is fixed to the top of the barrel connecting sleeve, the cutting assembly is fixed to the lower part of the barrel, and the extruder feeding device is fixedly connected to the barrel connecting sleeve. The feed outlet is connected to the inner hole of the barrel; the screw drive device includes an extrusion motor, a cylinder, a mounting plate, a guide rod, and a helical spring; the output shaft of the extrusion motor is connected to the tail of the screw through a coupling; the lower end of the guide rod is fixed to the barrel connecting sleeve, and the upper end of the guide rod passes through the guide hole in the mounting plate and is fixedly connected to the piston of the cylinder; the helical spring is sleeved on the outside of the guide rod, and the compressed helical spring is located between the lower end of the mounting plate and the upper end of the barrel connecting sleeve; both the extrusion motor and the cylinder are mounted on the upper surface of the mounting plate; the extrusion motor drives the screw to rotate; the cylinder drives the screw to move axially up and down, so that the screw leaves or approaches the extrusion die, thereby opening or closing the extrusion die.

[0008] As a preferred embodiment, the barrel connecting sleeve and the barrel are connected by interference fit, welding or screws; both the barrel connecting sleeve and the barrel are provided with through holes for the extruder feeding device to pass through laterally.

[0009] As a preferred option, a cooling water channel is provided in the barrel connecting sleeve.

[0010] As a preferred embodiment, the extruder feeding device includes a feeding screw, a barrel, a feeding motor, and a hopper; the feeding screw is connected to the feeding motor and is coaxially installed in the inner hole of the barrel, while the feeding motor is installed at the tail end of the barrel; the head of the barrel is fixed to the barrel connecting sleeve, and the head of the barrel passes through a coaxial through hole in the barrel connecting sleeve and the side wall of the barrel to connect the inner hole of the barrel with the inner hole of the barrel; the hopper is disposed on the barrel.

[0011] As a preferred embodiment, the cutting assembly includes two supports, two impact cylinders, and a metal wire; the two supports are fixed below the extrusion die, the two impact cylinders are respectively fixed on the two supports, the piston rods of the impact cylinders are horizontally set, and the two ends of the metal wire are respectively locked and fixed on the piston rods of the two impact cylinders by nuts. The high-speed extension and retraction of the piston rods drives the metal wire to move quickly to cut the extruded hot melt adhesive.

[0012] As a preferred embodiment, the outer surface of the barrel is provided with at least one heating device and at least one thermocouple for measuring the barrel temperature. The heating device covers the middle section (i.e., the solid melting section) and the lower section (i.e., the melt conveying section) of the barrel. The heating device can be an electric heating coil, an electromagnetic induction coil, an oil temperature controller, etc.

[0013] As a preferred option, the micro screw extruder also includes a clamp; one end of the clamp is fixedly connected to the barrel connecting sleeve, and the other end is fixed to a multi-axis robot or a multi-axis slide. Under the driving action of the multi-axis robot or the multi-axis slide, the micro screw extruder is driven to complete the coating action of hot melt adhesive film along a set trajectory.

[0014] The coating method of the micro screw extrusion device for coating hot melt adhesive film includes the following steps: (1) start the micro screw extrusion device to realize continuous extrusion of hot melt adhesive; (2) drive the micro screw extrusion device to move along the set trajectory to quickly coat the surface of the target object to be bonded with hot melt adhesive film; (3) after the coating is completed, stop the extrusion action, close the extrusion die flow channel, and quickly cut off the hot melt adhesive hanging below the extrusion die. Then drive the micro screw extrusion device back to the origin to prepare for the coating of hot melt adhesive film on the surface of the next target object.

[0015] As a preferred option, step (1) specifically involves: energizing the heating device to heat the barrel to a predetermined temperature, then starting the extrusion motor and the feeding motor respectively. The material in the hopper is conveyed to the barrel under the drive of the feeding screw. The material continues to melt under the shearing, extrusion and mixing action of the screw in the barrel and is continuously extruded into hot melt adhesive through the extrusion die.

[0016] As a preferred option, step (2) specifically involves: after the extrusion process has stabilized, starting the multi-axis robot or multi-axis slide, driving the micro screw extrusion equipment to move from the origin along the set trajectory, so as to quickly coat the surface of the target object to be bonded with hot melt adhesive film.

[0017] As a preferred option, step (3) specifically involves: after coating is completed, turning off the feeding motor and extrusion motor, and starting the cylinder to drive the screw to move downward along the axial direction until the head of the screw hits the surface of the flow channel of the extrusion die, thereby sealing the flow channel of the extrusion die to prevent the melt in the barrel from overflowing from the extrusion die; then, starting the impact cylinder, the metal wire is driven by the piston rod of the impact cylinder to quickly cut the hot melt adhesive suspended below the extrusion die; at the same time, the multi-axis robot or multi-axis slide table drives the micro screw extrusion equipment back to the origin, preparing for the coating of the hot melt adhesive film on the surface of the next target object.

[0018] The present invention has the following advantages:

[0019] 1. The hot melt adhesive film can be directly and quickly applied to the surface of the target object to be bonded, avoiding the processes of cutting, laying and hot pressing the hot melt adhesive film and then remelting it, which are required in the existing technology. This greatly shortens the process and avoids material waste, improving production efficiency and saving production costs.

[0020] 2. A screw drive device with screw rotation and axial lifting is used to control the precise extrusion of materials.

[0021] 3. The screw and feeding screw are arranged vertically, and the feeding structure and the discharge structure are integrated through the barrel connecting sleeve, resulting in a compact overall structure of the equipment.

[0022] 4. A cooling water channel is provided in the barrel connecting sleeve. During the extrusion process, cooling water is pumped into the cooling water channel to prevent the material particles in this section of the barrel (i.e., the solid conveying section) from melting prematurely, thereby ensuring stable material conveying during the extrusion process.

[0023] 5. An impact cylinder-controlled cutting assembly is used to quickly cut the extruded material, ensuring smooth production.

[0024] 6. A heating device and thermocouple are installed to precisely control the temperature of the melt in the barrel.

[0025] 7. Set up a fixture to integrate the extrusion equipment with a multi-axis robot or multi-axis slide. The multi-axis robot or multi-axis platform drives the micro screw extrusion equipment to coat the surface of the target object with hot melt adhesive film along a predetermined trajectory. This not only ensures stable quality but also enables highly automated production.

[0026] 8. Miniature screw extruders are compact in structure (usually occupying less than half a square meter of space), simple to operate, and reliable in operation, making them suitable for large-scale application in industrial production. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the traditional hot melt adhesive film bonding process.

[0028] Figure 2 This is a schematic diagram of a micro screw extrusion device.

[0029] Figure 3 yes Figure 2 A partial view of the structure shown from direction A.

[0030] Figure 4 yes Figure 2 A partial sectional view of the structure shown in Figure BB.

[0031] Figure 5a This is a schematic diagram of a micro screw extruder coating hot melt adhesive film.

[0032] Figure 5b This is a schematic diagram of the cutting component cutting the hot melt adhesive suspended on the extrusion die.

[0033] Figure 6 This is a schematic diagram of the screw closing the extrusion die flow channel.

[0034] The labels in the above figures are explained as follows:

[0035] a—Hot melt adhesive layer, b—Non-woven fabric layer, c—Insole, d—Upper mold half, e—Lower mold half.

[0036] 1—Screw, 2—Barrel, 3—Extrusion die, 4—Gland, 5—Electric heating coil, 6—Thermocouple

[0037] 7—Barrel connecting sleeve; 8—Screw drive unit; 9—Extruder feeding device; 10—Cutting assembly;

[0038] 11—Coupling, 12—Clamp, 13—Multi-axis robot, 14—Multi-axis slide, 15—Target object.

[0039] 16—Hot melt adhesive film.

[0040] 8-1—Extrusion motor, 8-2—Cylinder, 8-3—Mounting plate, 8-4—Guide rod, 8-5—Helical spring, 8-6—Piston.

[0041] 9-1—Feeding screw, 9-2—Bug, 9-3—Feeding motor, 9-4—Hopper.

[0042] 10-1—Bracket, 10-2—Impact cylinder, 10-3—Metal wire, 10-4—Wing nut, 10-5—Piston rod. Detailed Implementation

[0043] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0044] Figure 2The specific structure of a micro screw extrusion device for coating hot melt adhesive film is shown, including a screw 1, a barrel 2, and an extrusion die 3; the screw 1 is coaxially installed in the inner hole of the barrel 2; the extrusion die 3 is fixed to the concave end face of the bottom of the barrel 2 by screws through a pressure cap 4; two electric heating coils 5 and two thermocouples 6 are also provided on the outer surfaces of the middle section (i.e., the solid melting section) and the lower section (i.e., the melt conveying section) of the barrel 2. In addition, the micro screw extrusion equipment also includes a barrel connecting sleeve 7, a screw drive device 8 that can drive the screw to rotate circumferentially and move axially, an extruder feeding device 9, and a cutting assembly 10 for quickly cutting the hot melt adhesive extruded from the extrusion die 3; the barrel connecting sleeve 7 is fitted onto the outer wall of the upper section of the barrel 2 by an interference fit, and a cooling water channel is also provided in the barrel connecting sleeve 7; the tail of the screw 1 is connected to the screw drive device 8 by a coupling 11; the screw drive device 8 is integrally installed and fixed at the top of the barrel connecting sleeve 7; the cutting assembly 10 is fixed to the lower end face of the pressure cap 4 by screws; the extruder feeding device 9 is fixedly connected to the barrel connecting sleeve 7, and the feeding outlet of the extruder feeding device 9 is connected to the inner hole of the barrel 2.

[0045] The screw drive device 8 includes an extrusion motor 8-1, a cylinder 8-2, a mounting plate 8-3, a guide rod 8-4, and a helical spring 8-5. The output shaft of the extrusion motor 8-1 is connected to the tail of the screw 1 via a coupling 11. The lower end of the guide rod 8-4 is fixed to the top of the barrel connecting sleeve 7, and the upper end of the guide rod 8-4 passes through the guide hole in the mounting plate 8-3 and is fixedly connected to the piston 8-6 of the cylinder 8-2. The helical spring 8-5 is sleeved on the guide rod 8-4 and is located between the barrel connecting sleeve 7 and the mounting plate 8-3. The upper and lower end faces of the helical spring 8-5 are respectively in contact with the surfaces of the mounting plate 8-3 and the barrel connecting sleeve 7. The extrusion motor 8-1 and the cylinder 8-2 are both mounted and fixed on the upper surface of the mounting plate 8-3. Under the driving action of the extrusion motor 8-1 and the cylinder 8-2, the screw 1 can rotate in the circumferential direction and move up and down in the axial direction. In this embodiment, there are two cylinders, two guide rods, and two helical springs.

[0046] like Figure 2 and 3 As shown, the cutting assembly 10 includes two brackets 10-1, two impact cylinders 10-2, and a metal wire 10-3; both ends of the metal wire 10-3 are locked and fixed to the piston rods 10-5 of the two impact cylinders 10-2 by wing nuts 10-4; after the impact cylinders 10-2 are started, the high-speed extension and retraction of the piston rods 10-5 will drive the metal wire 10-3 to quickly complete the cutting and extrusion of hot melt adhesive; the two impact cylinders 10-2 are fixed to the two brackets 10-1 respectively; the two brackets 10-1 are fixed to the lower end face of the pressure cap 4 by screws.

[0047] like Figure 2As shown, the extruder feeding device 9 includes a feeding screw 9-1, a barrel 9-2, a feeding motor 9-3, and a hopper 9-4. The feeding screw 9-1 is connected to the feeding motor 9-3, and the feeding screw 9-1 is coaxially installed in the inner hole of the barrel 9-2. The feeding motor 9-3 is installed and fixed on the connecting flange on one end face of the barrel 9-2. The other end of the barrel 9-2 passes through the barrel connecting sleeve 7 and the coaxial through hole on the side wall of the barrel 2 to connect the barrel 9-2 and the inner hole of the barrel 2, and is fixedly connected to the barrel connecting sleeve 7 to achieve stable material conveying.

[0048] like Figure 4 As shown, in order to enable the micro screw extruder to complete the coating action of hot melt adhesive film along a predetermined trajectory, the micro screw extruder is fixed on the multi-axis robot 13 or multi-axis slide 14 by the clamp 12; one end of the clamp 12 is fixedly connected to the barrel connecting sleeve 7, and the other end is fixed on the multi-axis robot 13 or multi-axis slide 14.

[0049] The barrel is vertically positioned with a cylindrical through-hole inside. The extrusion die has a through-flow channel running vertically; the upper channel is an inverted frustum shape, and the lower channel is cylindrical. The screw includes, from top to bottom, a connecting section, an upper screw section, a main screw section, and a tapered sealing section. The feed outlet of the extruder's feeding device is positioned below the upper screw section. The connecting section connects to the extrusion motor; the upper screw section seals the barrel, and its threads are tightly fitted; the tapered sealing section cooperates with the flow channels of the extrusion die to open or close the die.

[0050] The following describes the working process of the micro screw extrusion device of the present invention for coating hot melt adhesive film.

[0051] The method for coating hot melt adhesive film with a micro screw extrusion device includes the following steps: (1) Powering the electric heating coil 5 to heat the corresponding area of ​​the barrel 2 to a predetermined temperature (e.g., 170 ℃), and then starting the extrusion motor 8-1 and the feeding motor 9-3 respectively. The material in the hopper 9-4 is conveyed to the barrel 2 under the drive of the feeding screw 9-1. The material continues to melt under the shearing, extrusion and mixing action of the screw 1 in the barrel 2, and is extruded into hot melt adhesive after continuously passing through the flow channel of the extrusion die 3. (2) After the extrusion process is stable, starting the multi-axis robot 13 or the multi-axis slide table 14 to drive the micro screw extrusion device to move along a predetermined trajectory from the origin, so as to quickly coat the surface of the target object 15 with hot melt adhesive to form a hot melt adhesive film 16 (e.g., 170 ℃). Figure 5a (as shown). (3) After coating is completed, turn off the feeding motor 9-3 and the extrusion motor 8-1, and start the cylinder 8-2 to drive the screw 1 to move downward along the axial direction until the head of the screw 1 hits the surface of the extrusion die 3 flow channel (as shown). Figure 6As shown), the flow channel of the extrusion die 3 is closed to prevent the melt in the barrel 2 from overflowing from the flow channel of the extrusion die 3; then, the impact cylinder 10-2 is activated, and the metal wire 10-3, driven by the piston rod 10-5, quickly cuts the hot melt adhesive (such as...) suspended below the extrusion die 3. Figure 5b (as shown); at the same time, the multi-axis robot 13 or the multi-axis slide 14 drives the micro screw extruder back to the origin, preparing for the hot melt adhesive film coating on the surface of the next target object.

[0052] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A micro screw extrusion device for coating hot melt adhesive films, comprising a screw, a barrel, and an extrusion die, wherein the vertically arranged screw is coaxially disposed in the inner hole of the barrel, and the extrusion die is disposed at the lower end of the barrel, characterized in that: It also includes a barrel connecting sleeve, an extruder feeding device, a screw drive device that can drive the screw to rotate and move axially, and a cutting assembly for quickly cutting the hot melt adhesive extruded from the extrusion die; The barrel connecting sleeve is fitted onto the outer wall of the upper section of the barrel, the screw drive device is fixed to the top of the barrel connecting sleeve, the cutting assembly is fixed to the bottom of the barrel, the extruder feeding device is fixedly connected to the barrel connecting sleeve, and the feeding outlet of the extruder feeding device is connected to the inner hole of the barrel. The screw drive unit includes an extrusion motor, a cylinder, a mounting plate, a guide rod, and a helical spring. The output shaft of the extrusion motor is connected to the tail of the screw via a coupling. The lower end of the guide rod is fixed to the barrel connecting sleeve, and the upper end of the guide rod passes through the guide hole in the mounting plate and is fixedly connected to the piston of the cylinder. The helical spring is sleeved on the outside of the guide rod, and the compressed helical spring is located between the lower end of the mounting plate and the upper end of the barrel connecting sleeve. Both the extrusion motor and the cylinder are mounted on the upper surface of the mounting plate. The extrusion motor drives the screw to rotate. The cylinder drives the screw to move axially up and down, so that the screw moves away from or closer to the extrusion die, thereby opening or closing the extrusion die. The outer surface of the barrel is provided with at least one heating device and at least one thermocouple for measuring the barrel temperature, and the heating device covers the middle section and the lower section of the barrel; The micro screw extrusion equipment also includes a clamp; one end of the clamp is fixedly connected to the barrel connecting sleeve, and the other end is fixed to a multi-axis robot or a multi-axis slide. Under the driving action of the multi-axis robot or the multi-axis slide, the micro screw extrusion equipment is driven to complete the coating action of hot melt adhesive film along the set trajectory.

2. The micro-screw extruder for coating hot melt adhesive film according to claim 1, characterized in that: The barrel connecting sleeve and the barrel are connected by interference fit, welding or screws; both the barrel connecting sleeve and the barrel are provided with through holes for the extruder feeding device to pass through laterally.

3. The micro-screw extruder for coating hot melt adhesive film according to claim 2, characterized in that: Cooling water channels are provided in the barrel connecting sleeve.

4. The micro-screw extruder for coating hot melt adhesive film according to claim 2, characterized in that: The extruder feeding device includes a feeding screw, a barrel, a feeding motor, and a hopper. The feeding screw is connected to the feeding motor and is coaxially installed in the inner hole of the barrel. The feeding motor is installed at the tail end of the barrel. The head of the barrel is fixed to the barrel connecting sleeve and passes through a coaxial through hole in the barrel connecting sleeve and the side wall of the barrel to connect the inner hole of the barrel with the inner hole of the barrel. The hopper is set on the barrel.

5. The micro-screw extruder for coating hot melt adhesive films according to claim 1, characterized in that: The cutting assembly includes two supports, two impact cylinders, and a metal wire. The two supports are fixed below the extrusion die, and the two impact cylinders are fixed on the two supports respectively. The piston rods of the impact cylinders are set horizontally. The two ends of the metal wire are locked to the piston rods of the two impact cylinders by nuts. The high-speed extension and retraction of the piston rods drives the metal wire to move quickly to cut the extruded hot melt adhesive.

6. The coating method of the micro-screw extruder for coating hot melt adhesive film according to claim 1, characterized in that, Includes the following steps: (1) Start the micro screw extruder to achieve continuous extrusion of hot melt adhesive; (2) Drive the micro screw extruder to move along the set trajectory to quickly coat the surface of the target object to be bonded with hot melt adhesive film; (3) After the coating is completed, stop the extrusion action, close the extrusion die flow channel, and quickly cut off the hot melt adhesive hanging below the extrusion die. Then drive the micro screw extruder back to the origin to prepare for the coating of hot melt adhesive film on the surface of the next target object.

7. The coating method of the micro-screw extruder for coating hot melt adhesive film according to claim 6, characterized in that, The extruder feeding device includes a feeding screw, a barrel, a feeding motor, and a hopper. The feeding screw is connected to the feeding motor and is coaxially installed in the inner hole of the barrel. The feeding motor is installed at the tail end of the barrel. The head of the barrel is fixed to the barrel connecting sleeve and passes through a coaxial through hole in the barrel connecting sleeve and the side wall of the barrel to connect the inner hole of the barrel with the inner hole of the barrel. The hopper is set on the barrel. Step (1) is as follows: Power on the heating device to heat the barrel to the predetermined temperature, and then start the extrusion motor and the feeding motor respectively. The material in the hopper is transported to the barrel under the drive of the feeding screw. The material continues to melt under the shearing, extrusion and mixing action of the screw in the barrel and is continuously extruded into hot melt adhesive through the extrusion die.

8. The coating method of the micro-screw extruder for coating hot melt adhesive film according to claim 6, characterized in that: The cutting assembly includes two supports, two impact cylinders, and a metal wire. The two supports are fixed below the extrusion die, and the two impact cylinders are fixed on the two supports respectively. The piston rods of the impact cylinders are set horizontally, and the two ends of the metal wire are locked and fixed to the piston rods of the two impact cylinders by nuts. The high-speed extension and retraction of the piston rods drives the metal wire to move quickly to cut the extruded hot melt adhesive. The equipment also includes a clamp; one end of the clamp is fixedly connected to the barrel connecting sleeve, and the other end is fixed to a multi-axis robot or a multi-axis slide. Under the driving action of the multi-axis robot or the multi-axis slide, the micro screw extruder is driven to complete the coating action of hot melt adhesive film along the set trajectory. Step (2) is as follows: After the extrusion process stabilizes, start the multi-axis robot or multi-axis slide to drive the micro screw extrusion equipment to move from the origin along the set trajectory to quickly coat the surface of the target object to be bonded with hot melt adhesive film. Step (3) is as follows: After the coating is completed, turn off the feeding motor and the extrusion motor, and start the cylinder to drive the screw to move downward along the axis until the head of the screw hits the surface of the flow channel of the extrusion die, so as to seal the flow channel of the extrusion die and prevent the melt in the barrel from overflowing from the extrusion die; then, start the impact cylinder, and the metal wire is driven by the piston rod of the impact cylinder to quickly cut the hot melt adhesive hanging below the extrusion die; at the same time, the multi-axis robot or multi-axis slide table drives the micro screw extrusion equipment back to the origin to prepare for the coating of hot melt adhesive film on the surface of the next target object.

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