Static electricity removing device for EPLA (expandable polylactic acid) particles

Abstract

The utility model relates to the field of biodegradable material production equipment.The electrostatic eliminating device comprises a guide cylinder arranged at a discharging port of an EPLA particle production system, and EPLA particles can fall into the guide cylinder from the discharging port and fall into a collecting module along the guide cylinder to be collected; an ion wind generation module is arranged on the guide cylinder, and the ion wind generation module can blow ion airflow into the guide cylinder so as to neutralize static electricity on EPLA particles. The static electricity on the surfaces of the EPLA particles is removed through the ionic wind, the influence on the mechanical performance and the forming performance of the EPLA particles is small, the control difficulty in the EPLA particle static electricity removing process is reduced, and the operation convenience is improved.

Description

Technical Field

[0001] This application relates to the field of equipment for the production of biodegradable materials, and in particular to a device for destaticating expanded polylactic acid (EPLA) particles. Background Technology

[0002] EPLA (Expanded Polylactide) is a biodegradable polylactic acid foam material, mainly made from starch extracted from biological resources such as corn, cassava, and sugarcane through fermentation and chemical synthesis. During the EPLA pelletizing process, because the cutter is made of metal, friction occurs between the metal cutter and the plastic polymer, generating static electricity on the EPLA particles. Under the influence of static electricity, the EPLA particles attract each other, forming clumping. These clumping particles can cause blockages in the subsequent pipeline transportation process, thus affecting the conveying efficiency of the EPLA particles and consequently affecting the filling of the mold. This results in the EPLA particles failing to fill the mold completely, leading to poor product molding quality.

[0003] To prevent EPLA particles from agglomerating, the current approach is to add antistatic agents to the EPLA particles. These agents reduce static electricity buildup and lower the risk of particle clumping and clogging pipes. However, controlling the amount of antistatic agent is difficult. Too little agent results in ineffective antistatic effects, while too much agent may affect the physical and mechanical properties of the material, making the process of destaticating EPLA particles challenging to manage. Therefore, there is an urgent need to develop an EPLA particle destatication device. Utility Model Content

[0004] To address the challenge of controlling the static removal process of EPLA particles, this application provides a static removal device for expanded polylactic acid (EPLA) particles.

[0005] The destatic device for expanded polylactic acid (EPLA) particles provided in this application adopts the following technical solution:

[0006] An antistatic device for expanded polylactic acid (EPLA) particles includes a guide tube disposed at the discharge port of an EPLA particle production system. EPLA particles can fall into the guide tube from the discharge port and fall along the guide tube to a collection module for collection. The guide tube is equipped with an ion wind generating module, which can blow an ion airflow into the guide tube to neutralize the static electricity on the EPLA particles.

[0007] By adopting the above technical solution, EPLA particles flow along the guide tube as they fall from the discharge port into the collection module. The ion wind generation module generates an ion airflow and blows the ion airflow into the guide tube, covering the surface of the EPLA particles. This neutralizes the static electricity on the surface of the EPLA particles. Compared with adding antistatic agents, this solution has less impact on the mechanical properties and molding performance of EPLA particles, reduces the difficulty of controlling the static electricity removal process of EPLA particles, and improves the convenience of operation.

[0008] Preferably, the guide tube is provided with a gathering member, which is located above the ion wind generating module, so as to guide the EPLA particles to gather towards the center of the guide tube.

[0009] By adopting the above technical solution, the EPLA particles are gathered to the middle position of the guide cylinder using the aggregating component, avoiding contact between the EPLA particles and the ion air bar, which would lead to the redistribution of charge on the particle surface, thereby improving the neutralization effect of static electricity on the EPLA particle surface.

[0010] Preferably, the gathering member includes a frustum-shaped cylinder with its larger end facing upwards and its smaller end facing downwards.

[0011] By adopting the above technical solution, the truncated cone can uniformly gather the EPLA particles at the edge towards the center of the guide tube.

[0012] Preferably, there are at least two sets of ion wind generating modules, which are evenly spaced along the circumference of the guide tube.

[0013] Preferably, the ion wind generating module is in three groups, and the three groups of ion wind generating modules are arranged at 120° intervals along the circumference of the guide tube.

[0014] By adopting the above technical solution, three sets of ion wind generating modules are used to blow ion airflow onto EPLA particles. This allows the force of the ion airflow blown by the three sets of ion wind generating modules to be canceled out when the EPLA particles fall, reducing the deviation of the falling trajectory of the EPLA particles and thus improving the stability of the falling EPLA particles.

[0015] Preferably, the ion wind generating module includes an ion wind bar, and the guide tube has mounting ports that correspond one-to-one with the ion wind bar. The air outlet of the ion wind bar is connected to the inner cavity of the guide tube through the mounting ports so that the ion airflow can come into contact with EPLA particles.

[0016] By adopting the above technical solution, the needle-shaped electrodes in the ion bar will generate a corona discharge phenomenon. The corona discharge ionizes the surrounding air molecules, generating positive and negative ions. The high-pressure gas built into the ion bar blows these charged ions into the guide tube in the form of airflow through the installation port, covering the surface of the EPLA particles and achieving rapid neutralization of static electricity.

[0017] In summary, this application includes at least one of the following beneficial technical effects:

[0018] 1. As EPLA particles fall from the discharge port into the collection module, they flow along the guide tube. The ion wind generation module generates an ion airflow and blows the ion airflow into the guide tube, covering the surface of the EPLA particles. This neutralizes the static electricity on the surface of the EPLA particles, has little impact on the mechanical properties and molding performance of the EPLA particles, reduces the difficulty of controlling the static electricity removal process of EPLA particles, and improves the convenience of operation.

[0019] 2. The EPLA particles are gathered in the middle of the feed tube by the frustum cylinder, which avoids the EPLA particles from coming into contact with the ion air bar and causing the charge on the particle surface to redistribute, thereby improving the neutralization effect of static electricity on the EPLA particle surface. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of an antistatic device for expanded polylactic acid (EPLA) particles according to Embodiment 1 of this application.

[0021] Figure 2 This is a top view of the device in this embodiment.

[0022] Figure 3 It is along Figure 2 A cross-sectional view along line AA in the middle.

[0023] Explanation of reference numerals in the attached drawings: 1. Guide tube; 11. Mounting port; 2. Ionizing air generating module; 21. Ionizing air bar; 3. Feeding tube; 31. Feeding port; 4. Collection module; 5. Gathering component; 51. Frustum cylinder. Detailed Implementation

[0024] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0025] This application discloses an antistatic device for expanded polylactic acid (EPLA) particles. Example 1

[0026] Reference Figure 1 , Figure 2 and Figure 3An antistatic device for expanded polylactic acid (EPLA) particles includes a guide cylinder 1 and an ion wind generating module 2. A discharge cylinder 3 is located at the end of the EPLA particle production system. The EPLA particle production system transports the EPLA particles granulated by the pelletizing system to the discharge cylinder 3 through a pipeline. A discharge port 31 is located at the bottom of the discharge cylinder 3, and a collection module 4 is located directly below the discharge port 31. The collection module 4 is a collection cylinder into which the EPLA particles fall and are then packaged. The guide cylinder 1 is positioned between the discharge cylinder 3 and the collection cylinder. The top of the guide cylinder 1 is fixedly connected to the discharge cylinder 3, and its top opening is connected to the discharge port 31. The bottom opening of the guide cylinder 1 is located above the collection module 4, allowing the EPLA particles in the discharge cylinder 3 to fall along the guide cylinder 1 into the collection module 4.

[0027] Reference Figure 2 , Figure 3 In this embodiment, three sets of ion wind generating modules 2 are used as an example. In other embodiments, the number of ion wind generating modules 2 can be any number of two, four, five, or six sets, and the central angles corresponding to two adjacent ion wind generating modules 2 are the same. The three sets of ion wind generating modules 2 are arranged at 120° intervals along the circumference of the guide tube 1 so that the force of the ion airflow blown by the three sets of ion wind generating modules 2 can be canceled out by the falling EPLA particles, reducing the deviation of the falling trajectory of the EPLA particles and thus improving the stability of the falling EPLA particles. The ion wind generating modules 2 can blow out charged ions in the form of airflow to cover the surface of EPLA particles, thereby neutralizing the static electricity on the surface of EPLA particles.

[0028] As EPLA particles fall from the discharge port 31 into the collection module 4, they flow along the guide tube 1. The ion wind generating module 2 generates an ion airflow and blows the ion airflow into the guide tube 1, covering the surface of the EPLA particles. This neutralizes the static electricity on the surface of the EPLA particles. Compared with adding an antistatic agent, this solution has less impact on the mechanical properties and molding performance of the EPLA particles, reduces the difficulty of controlling the static electricity removal process of the EPLA particles, and improves the convenience of operation.

[0029] Reference Figure 2 , Figure 3In this embodiment, the ion wind generating module 2 includes an ion wind bar 21. The guide cylinder 1 has mounting ports 11 corresponding to the ion wind bars 21. The ion wind bars 21 are fixedly installed inside the mounting ports 11, with their outlets located within the ports 11 and facing the inner cavity of the guide cylinder 1, allowing the ion airflow to be blown towards the EPLA particles. The ion wind bars 21 are installed at the middle height of the guide cylinder 1. The ion wind bars 21 are connected to an external power supply and an air pump. The needle-shaped electrodes in the ion wind bars 21 undergo corona discharge, ionizing the surrounding air molecules to generate positive and negative ions. The air pump generates high-pressure gas inside the ion wind bars 21. This high-pressure gas blows these charged ions into the guide cylinder 1 through the mounting ports 11 in the form of an airflow, covering the surface of the EPLA particles and achieving rapid neutralization of static electricity.

[0030] Reference Figure 2 , Figure 3 The guide tube 1 is equipped with a gathering component 5, which in this embodiment is a frustum-shaped cylinder 51. The frustum-shaped cylinder 51 is located above the mounting port 11. The large end of the frustum-shaped cylinder 51 is fixedly connected to the inner wall of the guide tube 1. The large end of the frustum-shaped cylinder 51 faces upward and is opposite to the discharge port 31, while the small end of the frustum-shaped cylinder 51 faces downward. The frustum-shaped cylinder 51 gathers the EPLA particles to the middle position of the guide tube 1, avoiding contact between the EPLA particles and the ion bar 21, which would cause a redistribution of the charge on the particle surface, thereby improving the neutralization effect of static electricity on the EPLA particle surface. The EPLA particles carry a charge of 2-5kV when they exit from the discharge port 31, and their charge is reduced to 1-100V after being electrostatically removed by the ion bar 21.

[0031] Reference Figure 3 The dimensional relationships of the various parts in the static elimination device are as follows: the diameter of the discharge port 31 = the inner diameter of the guide tube 1 = D, the length of the guide tube 1 L1 = 2D~10D, the length of the particle air bar outlet L2 = 1.5D~6D, the length of the frustum cylinder 51 L3 = 0.5D~1D, the angle α between the peripheral side wall of the frustum cylinder 51 and the vertical direction = 30°~75°, and the size of D depends on the output of EPLA particles. The larger the output, the larger the value of D.

[0032] The implementation principle of Example 1 is as follows: During the process of EPLA particles falling from the discharge port 31 into the collection module 4, the EPLA particles flow towards the center of the guide cylinder 1 under the guidance of the frustum cylinder 51. Then, the EPLA particles fall along the guide cylinder 1. During the falling process, the ion air bar 21 generates an ion airflow and blows the ion airflow into the guide cylinder 1 and covers the surface of the EPLA particles, thereby neutralizing the static electricity on the surface of the EPLA particles. This solution has little impact on the mechanical properties and molding properties of the EPLA particles, reduces the difficulty of controlling the static electricity removal process of the EPLA particles, and improves the convenience of operation.

[0033] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A device for destaticating expanded polylactic acid (EPLA) particles, characterized in that: The system includes a guide tube (1) located at the discharge port (31) of the EPLA particle production system. EPLA particles can fall from the discharge port (31) into the guide tube (1) and fall along the guide tube (1) into the collection module (4) for collection. The guide tube (1) is equipped with an ion wind generating module (2), which can blow an ion airflow into the guide tube (1) to neutralize the static electricity on the EPLA particles.

2. The destatic device for expanded polylactic acid (EPLA) particles according to claim 1, characterized in that: The guide tube (1) is provided with a gathering member (5), which is located above the ion wind generating module (2) to guide EPLA particles to gather towards the center of the guide tube (1).

3. The destatic device for expanded polylactic acid (EPLA) particles according to claim 2, characterized in that: The gathering component (5) includes a frustum cylinder (51), with the larger end of the frustum cylinder (51) facing upwards and the smaller end facing downwards.

4. The destatic device for expanded polylactic acid (EPLA) particles according to claim 1, characterized in that: The ion wind generating modules (2) are at least two sets and are evenly spaced along the circumference of the guide tube (1).

5. The destatic device for expanded polylactic acid (EPLA) particles according to claim 4, characterized in that: The ion wind generating module (2) consists of three groups, which are arranged at 120° intervals along the circumference of the guide tube (1).

6. The destatic device for expanded polylactic acid (EPLA) particles according to claim 4, characterized in that: The ion wind generating module (2) includes an ion wind bar (21). The guide tube (1) has an installation port (11) that corresponds to the ion wind bar (21). The air outlet of the ion wind bar (21) is connected to the inner cavity of the guide tube (1) through the installation port (11) so that the ion airflow can come into contact with EPLA particles.

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