CN113580614A - Anti-static polytetrafluoroethylene plastic film and preparation device thereof - Google Patents

Anti-static polytetrafluoroethylene plastic film and preparation device thereof Download PDF

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Publication number
CN113580614A
CN113580614A CN202110865023.9A CN202110865023A CN113580614A CN 113580614 A CN113580614 A CN 113580614A CN 202110865023 A CN202110865023 A CN 202110865023A CN 113580614 A CN113580614 A CN 113580614A
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CN
China
Prior art keywords
tank
particle deposition
blow molding
plastic film
aluminum sheet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202110865023.9A
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Chinese (zh)
Inventor
高祥忠
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tongcheng Xiangyun Plastic Industry Co ltd
Original Assignee
Tongcheng Xiangyun Plastic Industry Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tongcheng Xiangyun Plastic Industry Co ltd filed Critical Tongcheng Xiangyun Plastic Industry Co ltd
Priority to CN202110865023.9A priority Critical patent/CN113580614A/en
Publication of CN113580614A publication Critical patent/CN113580614A/en
Pending legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29DPRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D7/00Producing flat articles, e.g. films or sheets
    • B29D7/01Films or sheets
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B13/00Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
    • B05B13/02Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work
    • B05B13/0278Arrangement or mounting of spray heads
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/20Arrangements for agitating the material to be sprayed, e.g. for stirring, mixing or homogenising
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38Packaging materials of special type or form
    • B65D65/42Applications of coated or impregnated materials

Abstract

The invention discloses an anti-static polytetrafluoroethylene plastic film and a preparation device thereof, relates to the technical field of anti-static plastic films, and aims to solve the problems that most of the existing anti-static plastic films in the prior art adopt a physical deposition mode to carry out anti-static film coating treatment, but the film base binding force of the production place of the physical vapor deposition technology is weak, the coating is not wear-resistant, and the longer service life cannot be ensured. The aluminum sheet vapor spray tank is arranged on two sides of the PE particle deposition tank, the aluminum sheet vapor spray tank is connected with the PE particle deposition tank through a gas port, a tank body base is arranged at the bottom of the PE particle deposition tank, a sealing cover is arranged at the top of the PE particle deposition tank, the sealing cover is rotatably connected with the PE particle deposition tank through hinges and is fixedly connected with the tank body base and the PE particle deposition tank, a vacuum pump is arranged at the top of the sealing cover, and the vacuum pump extends to the inside of the PE particle deposition tank.

Description

Anti-static polytetrafluoroethylene plastic film and preparation device thereof
Technical Field
The invention relates to the technical field of anti-static plastic films, in particular to an anti-static polytetrafluoroethylene plastic film and a preparation device thereof.
Background
The functional film is an important variety in packaging materials, is often an indispensable material in some specific packaging fields, has a very important position in plastic packaging materials, along with the rapid development of the electronic industry, the integration level of electronic circuit boards is higher and higher, the high density of electronic components on a mainboard, the compactness of wiring, even the wide adoption of surface-mounted components are easy to cause electrostatic damage to circuit boards, when national institutions test integrated circuits in certain large-scale communication system equipment, one third of the faulty integrated circuits are found to be broken down by electrostatic discharge, and the electrostatic damage to the integrated circuits can be avoided by packaging products by using the antistatic film.
However, most of the existing anti-static plastic films adopt a physical deposition mode to carry out anti-static film coating treatment, but the film base binding force of the production place of the physical vapor deposition technology is weak, and the coating film is not wear-resistant, so that the longer service life cannot be ensured; therefore, the existing requirements are not met, and an anti-static polytetrafluoroethylene plastic film and a preparation device thereof are provided for the requirements.
Disclosure of Invention
The invention aims to provide an anti-static polytetrafluoroethylene plastic film and a preparation device thereof, which are used for solving the problems that most of the existing anti-static plastic films proposed in the background technology adopt a physical deposition mode to carry out anti-static film coating treatment, but the film base binding force of the production place of the physical vapor deposition technology is weak, the coating film is not wear-resistant, and the longer service life cannot be ensured.
In order to achieve the purpose, the invention provides the following technical scheme: a preparation device of an anti-static polytetrafluoroethylene plastic film comprises a PE (polyethylene) particle deposition tank, an aluminum sheet vapor spraying tank and a blow molding platform box, wherein the aluminum sheet vapor spraying tank is arranged on two sides of the PE particle deposition tank, the aluminum sheet vapor spraying tank is connected with the PE particle deposition tank through a gas state port, a tank body base is arranged at the bottom of the PE particle deposition tank, a sealing cover is arranged at the top of the PE particle deposition tank and rotatably connected with the PE particle deposition tank through a hinge, the tank body base is fixedly connected with the PE particle deposition tank, a vacuum pump is arranged at the top of the sealing cover and extends to the inside of the PE particle deposition tank, a vapor deposition chamber is arranged inside the PE particle deposition tank, a central rotary drum is arranged inside the vapor deposition chamber and rotatably connected with the tank body base, and the outer surface of the central rotary drum is of a net structure, the inside of the central rotary drum is provided with a particle mixing cavity, the inner side of the vapor deposition cavity is provided with a vertical row of nozzles, and the vertical row of nozzles are connected with the gas-state port through a pipeline.
Preferably, the top of the blow molding platform box is provided with a fixed box cover, a wiring sleeve rail is arranged between the fixed box cover and the blow molding platform box, and the wiring sleeve rail is connected with the fixed box cover and the blow molding platform box through screws.
Preferably, the two sides of the blow molding platform box are both provided with constant-temperature hot tanks which are fixedly connected with the blow molding platform box, and movable horizontal grooves are formed in the blow molding platform box.
Preferably, the inside in activity horizontal groove is provided with down the metal magnetic plate, and the top of metal magnetic plate is provided with down the metal magnetic plate, metal magnetic plate and last metal magnetic plate all set up to sliding structure down, and the inside of metal magnetic plate and last metal magnetic plate is provided with copper line magnetism chamber down.
Preferably, one end of the aluminum sheet gas-phase spraying tank is provided with a gas-state output end, the other end of the aluminum sheet gas-phase spraying tank is provided with a raw material input end, and the outer surface of the gas-state output end is provided with an output valve port.
Preferably, the top of the aluminum sheet vapor spray can is provided with an evaporation heater, the evaporation heater is fixedly connected with the aluminum sheet vapor spray can, and the top of the evaporation heater is provided with a power module.
Preferably, one side of the aluminum sheet gas-phase spray tank is provided with a targeting plate, the outer surface of the targeting plate is provided with a plurality of injection ports.
An antistatic polytetrafluoroethylene plastic film comprises PE particles and aluminum powder, wherein the aluminum powder accounts for 3-5%
Compared with the prior art, the invention has the beneficial effects that:
1. the PE particle deposition tank and the aluminum sheet gas-phase spray tank are matched for use, raw material particles of a blown film body can be processed, the blown molding table box is matched with a blow molding machine for use and is positioned on one side of the output end of the blow molding machine, a film material formed by blow molding needs to be processed inside the blown molding table box, a lower metal magnetic plate and an upper metal magnetic plate are arranged inside the blown molding table box, the lower metal magnetic plate and the upper metal magnetic plate are respectively positioned above and below the film material, the metal magnetic plates can generate magnetic force after being electrified, when the film material passes through the metal magnetic plates, aluminum inside the film material can be adsorbed and moved to the surfaces of two sides of the film material, so that an internal film coating is formed, and the film body cannot lose effectiveness due to long-time external force friction when in use;
2. according to the invention, PE raw material particles are poured into a central rotary drum in a PE particle deposition tank, then gas particles in an aluminum sheet gas-phase spraying tank are input through a gas-phase port, the gas particles are sprayed in an atomized manner by vertical nozzles on two sides of a cavity, the central rotary drum rotates highly at the moment, so that the particles in the gas-phase spraying tank are stirred, the particles are continuously contacted with a gas-phase aluminum material in the stirring process to be adsorbed on the particles, the melting point temperature of aluminum is 660 ℃, the melting point of a PE material is 85-110 ℃, and when the particles are subsequently subjected to hot melting, the temperature is controlled below the melting point of the aluminum, the structure of the aluminum cannot be influenced by the temperature, and meanwhile, the aluminum material can be fused into a film body material, so that the binding force of a film base is improved.
Drawings
FIG. 1 is an overall front view of the present invention;
FIG. 2 is a schematic view of the internal structure of the PE particle deposition tank of the present invention;
FIG. 3 is an enlarged schematic view of the structure at A of the present invention;
FIG. 4 is a schematic view of a blow molding station box configuration of the present invention;
FIG. 5 is a schematic view of the structure of the aluminum sheet vapor spray can of the present invention.
In the figure: 1. a PE particle deposition tank; 2. spraying an aluminum sheet gas phase; 3. blow molding a platen box; 4. a gaseous port; 5. a tank body base; 6. sealing and closing the cover; 7. a vacuum pump; 8. a gaseous output; 9. feeding raw materials into a terminal; 10. an evaporation heater; 11. a power supply module; 12. an injection port; 13. a targeting plate; 14. an output valve port; 15. a constant temperature heating tank; 16. fixing the box cover; 17. routing and sleeving rails; 18. a lower metal magnetic plate; 19. an upper metal magnetic plate; 20. a copper wire magnetic cavity; 21. a movable horizontal groove; 22. a vapor deposition chamber; 23. a central drum; 24. a particle mixing cavity; 25. vertical rows of nozzles.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1-3, an embodiment of the present invention is shown: a preparation device of an anti-static polytetrafluoroethylene plastic film comprises a PE particle deposition tank 1, an aluminum sheet vapor spray tank 2 and a blow molding platform box 3, wherein the PE particle deposition tank 1 and the aluminum sheet vapor spray tank 2 need to be matched for use, raw material particles of a blow molding film body can be processed, the blow molding platform box 3 needs to be matched with a blow molding machine for use and is positioned on one side of the output end of the blow molding machine, a film material formed by blow molding needs to be processed inside the blow molding platform box 3, the aluminum sheet vapor spray tanks 2 are arranged on two sides of the PE particle deposition tank 1, the aluminum sheet vapor spray tanks 2 and the PE particle deposition tank 1 are connected through a gas port 4, a tank body base 5 is arranged at the bottom of the PE particle deposition tank 1, a sealing cover 6 is arranged at the top of the PE particle deposition tank 1, the sealing cover 6 is rotationally connected with the PE particle deposition tank 1 through a hinge, and the tank body base 5 is fixedly connected with the PE particle deposition tank 1, the top of the sealing cover 6 is provided with a vacuum pump 7, the vacuum pump 7 extends to the inside of the PE particle deposition tank 1, the inside of the PE particle deposition tank 1 is provided with a vapor deposition chamber 22, the inside of the vapor deposition chamber 22 is provided with a central rotary drum 23, the central rotary drum 23 is rotatably connected with the tank body base 5, the outer surface of the central rotary drum 23 is of a net structure, the inside of the central rotary drum 23 is provided with a particle mixing chamber 24, the inner side of the vapor deposition chamber 22 is provided with a vertical nozzle 25, the vertical nozzle 25 is connected with the gas port 4 through a pipeline, PE raw material particles are poured into the central rotary drum 23 inside the PE particle deposition tank 1, then the sealing cover 6 at the top is closed, air inside the tank body is pumped out through the vacuum pump 7 above the sealing cover 6, the whole vapor deposition chamber 22 is maintained in a vacuum state, when gas particles inside the aluminum sheet vapor deposition tank 2 are input through the gas port 4, the vertical nozzles 25 on two sides of the cavity can spray the aluminum material in an atomized form, the central rotary drum 23 rotates highly at the moment, the particles inside the cavity are stirred, the particles can be continuously contacted with gaseous aluminum materials in the stirring process to be adsorbed on the particles, the melting point temperature of the aluminum is 660 ℃, the melting point of the PE material is 85-110 ℃, and when the particles are subsequently subjected to hot melting, the temperature is controlled below the melting point of the aluminum, the structure of the aluminum cannot be influenced by the temperature, meanwhile, the aluminum materials can be fused into the film body material, and the binding force of the film base is improved.
Referring to fig. 4, a fixed box cover 16 is disposed on the top of the blow molding table box 3, a routing sleeve rail 17 is disposed between the fixed box cover 16 and the blow molding table box 3, the routing sleeve rail 17 is connected with the fixed box cover 16 and the blow molding table box 3 through screws, a blow molding film needs to pass through the routing sleeve rails 17 on both sides, the film which is just molded has a high temperature and is not completely cooled and molded, the internal molecular structure of the film in the state is still in a changing state and can intervene through an external force, so that the surface temperature of the film needs to be maintained at the initial temperature of the blow molding through the temperature released by the constant temperature hot tank 15, the constant temperature hot tanks 15 are disposed on both sides of the blow molding table box 3, the constant temperature hot tank 15 is fixedly connected with the blow molding table box 3, a movable horizontal groove 21 is disposed in the blow molding table box 3, and a lower metal magnetic plate 18 is disposed in the movable horizontal groove 21, and the top of metal magnetic sheet 18 is provided with metal magnetic sheet 19 down, metal magnetic sheet 18 and last metal magnetic sheet 19 all set up to sliding construction down, and the inside of metal magnetic sheet 18 and last metal magnetic sheet 19 is provided with copper line magnetism chamber 20 down, metal magnetic sheet 18 and last metal magnetic sheet 19 are located the top and the below of coating material respectively down, metal magnetic sheet can produce magnetic force after the circular telegram, when the coating material passes through between the metal magnetic sheet, the inside aluminium of coating material will be adsorbed the both sides surface that removes the coating material, thereby form an inside coating film, thereby the condition that the coating film became invalid can not lead to because of long-time external force friction when the film body uses like this appears.
Referring to fig. 5, one end of the aluminum sheet vapor spraying can 2 is provided with a gaseous output end 8, the other end of the aluminum sheet vapor spraying can 2 is provided with a raw material input end 9, the outer surface of the gaseous output end 8 is provided with an output valve port 14, the top of the aluminum sheet vapor spraying can 2 is provided with an evaporation heater 10, and the evaporation heater 10 is fixedly connected with the aluminum sheet vapor spray can 2, the top of the evaporation heater 10 is provided with a power supply module 11, one side of the aluminum sheet vapor spray can 2 is provided with a targeting plate 13, and the outer surface of the target plate 13 is provided with a plurality of injection ports 12, the injection ports 12 are used for placing aluminum sheets or aluminum powder into the aluminum sheet vapor spray tank 2 from the raw material input end 9, then the aluminum in the tank body is heated by the evaporation heater 10 and evaporated to form a gaseous state, then the direction of the gaseous aluminum is adjusted by the target plate 13, and the gaseous aluminum is injected into the PE particle deposition tank 1 in a pressurizing mode.
An antistatic polytetrafluoroethylene plastic film comprises PE particles and aluminum powder, wherein the aluminum powder accounts for 3-5%.
The working principle is as follows: when in use, the output valve port 14 on the surface of the gaseous output end 8 at one end of the two groups of aluminum sheet vapor spraying tanks 2 is connected to the gaseous port 4 of the PE particle deposition tank 1, then PE raw material particles are poured into the central rotary drum 23 in the PE particle deposition tank 1, then the sealing close cover 6 at the top is closed, air in the tank body is pumped out through the vacuum pump 7 above the sealing close cover 6, the whole vapor deposition cavity 22 is maintained in a vacuum state, then aluminum sheets or aluminum powder are placed in the aluminum sheet vapor spraying tank 2 from the raw material feeding end 9, then the aluminum in the tank body is heated through the evaporation heater 10 and evaporated into a gaseous state, then the direction of the gaseous aluminum is adjusted through the targeting plate 13 and is injected into the PE particle deposition tank 1 in a pressurizing mode, when gas particles in the vapor spraying tank 2 are input through the gaseous port 4, the vertical nozzles 25 on two sides of the cavity can spray the particles in an atomized form, at the moment, the central drum 23 rotates highly, so that the particles inside are stirred, the particles are continuously contacted with gaseous aluminum materials in the stirring process to be adsorbed on the particles, the particles are subsequently put into a blow molding machine for hot melting, the blow molding table box 3 is positioned on one side of the output end of the blow molding machine, the film formed by blow molding needs to be processed inside the blow molding table box 3, a lower metal magnetic plate 18 and an upper metal magnetic plate 19 are arranged inside the blow molding table box 3, the lower metal magnetic plate 18 and the upper metal magnetic plate 19 are respectively positioned above and below the film, the metal magnetic plates can generate magnetic force after being electrified, when the film passes through the metal magnetic plates, the aluminum inside the film can be adsorbed and moved to the two side surfaces of the film, so as to form an internal coating film, therefore, the condition that the coating film fails due to long-time external force friction is avoided when the film body is used.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims (8)

1. The utility model provides a preparation facilities of antistatic polytetrafluoroethylene plastic film, includes PE granule deposition tank (1), aluminum sheet vapour-phase spray tank (2) and blow molding platform case (3), its characterized in that: the aluminum sheet vapor spraying tank (2) is arranged on two sides of the PE particle deposition tank (1), the aluminum sheet vapor spraying tank (2) is connected with the PE particle deposition tank (1) through a gas state port (4), a tank body base (5) is arranged at the bottom of the PE particle deposition tank (1), a sealing cover (6) is arranged at the top of the PE particle deposition tank (1), the sealing cover (6) is rotatably connected with the PE particle deposition tank (1) through a hinge, the tank body base (5) is fixedly connected with the PE particle deposition tank (1), a vacuum pump (7) is arranged at the top of the sealing cover (6), the vacuum pump (7) extends to the inside of the PE particle deposition tank (1), a vapor deposition cavity (22) is arranged inside the PE particle deposition tank (1), a central rotary drum (23) is arranged inside the vapor deposition cavity (22), the central rotary drum (23) is rotatably connected with the tank body base (5), the outer surface of the central rotary drum (23) is of a net-shaped structure, a particle mixing cavity (24) is arranged inside the central rotary drum (23), a vertical row of nozzles (25) are arranged on the inner side of the vapor deposition cavity (22), and the vertical row of nozzles (25) are connected with the gas-state port (4) through a pipeline.
2. The apparatus for preparing an antistatic teflon plastic film as claimed in claim 1, wherein: the top of blow molding platform case (3) is provided with fixed case lid (16), and is provided with between fixed case lid (16) and blow molding platform case (3) and walks traditional thread binding putting (17), walk traditional thread binding putting (17) and pass through bolted connection with fixed case lid (16) and blow molding platform case (3).
3. The apparatus for preparing an antistatic teflon plastic film as claimed in claim 2, wherein: the blow molding platform box is characterized in that constant-temperature hot tanks (15) are arranged on two sides of the blow molding platform box (3), the constant-temperature hot tanks (15) are fixedly connected with the blow molding platform box (3), and movable horizontal grooves (21) are formed in the blow molding platform box (3).
4. The apparatus for preparing an antistatic polytetrafluoroethylene plastic film according to claim 3, wherein: the inside of activity horizontal slot (21) is provided with down metal magnetic plate (18), and the top of metal magnetic plate (18) is provided with down metal magnetic plate (19), metal magnetic plate (18) and last metal magnetic plate (19) all set up to sliding construction down, and the inside of metal magnetic plate (18) and last metal magnetic plate (19) is provided with copper line magnetism chamber (20) down.
5. The apparatus for preparing an antistatic teflon plastic film as claimed in claim 1, wherein: one end of the aluminum sheet vapor spraying tank (2) is provided with a gaseous output end (8), the other end of the aluminum sheet vapor spraying tank (2) is provided with a raw material input end (9), and the outer surface of the gaseous output end (8) is provided with an output valve port (14).
6. The apparatus for preparing an antistatic polytetrafluoroethylene plastic film according to claim 5, wherein: the top of aluminum sheet vapor spray tank (2) is provided with evaporating heater (10), and evaporating heater (10) spouts tank (2) fixed connection with the aluminum sheet vapor, the top of evaporating heater (10) is provided with power module (11).
7. The apparatus for preparing an antistatic polytetrafluoroethylene plastic film according to claim 5, wherein: one side of the aluminum sheet gas-phase spray tank (2) is provided with a target plate (13), the outer surface of the target plate (13) is provided with a plurality of injection ports (12), and the injection ports (12) are provided with a plurality of holes.
8. An antistatic polytetrafluoroethylene plastic film, which is realized based on the preparation device of the antistatic polytetrafluoroethylene plastic film as claimed in any one of claims 1 to 7, and is characterized by comprising PE particles and aluminum powder, wherein the aluminum powder accounts for 3 to 5 percent.
CN202110865023.9A 2021-07-29 2021-07-29 Anti-static polytetrafluoroethylene plastic film and preparation device thereof Pending CN113580614A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110865023.9A CN113580614A (en) 2021-07-29 2021-07-29 Anti-static polytetrafluoroethylene plastic film and preparation device thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110865023.9A CN113580614A (en) 2021-07-29 2021-07-29 Anti-static polytetrafluoroethylene plastic film and preparation device thereof

Publications (1)

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CN113580614A true CN113580614A (en) 2021-11-02

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Family Applications (1)

Application Number Title Priority Date Filing Date
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6395149B1 (en) * 1998-06-30 2002-05-28 3M Innovative Properties Company Method of making light colored, electrically conductive coated particles
CN112372958A (en) * 2020-11-20 2021-02-19 广东工业大学 Injection molding device and method for magnetic polymer composite material

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6395149B1 (en) * 1998-06-30 2002-05-28 3M Innovative Properties Company Method of making light colored, electrically conductive coated particles
CN112372958A (en) * 2020-11-20 2021-02-19 广东工业大学 Injection molding device and method for magnetic polymer composite material

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Application publication date: 20211102