CN110819157A - Production process of double-layer epoxy powder - Google Patents
Production process of double-layer epoxy powder Download PDFInfo
- Publication number
- CN110819157A CN110819157A CN201911195391.6A CN201911195391A CN110819157A CN 110819157 A CN110819157 A CN 110819157A CN 201911195391 A CN201911195391 A CN 201911195391A CN 110819157 A CN110819157 A CN 110819157A
- Authority
- CN
- China
- Prior art keywords
- materials
- stirring
- double
- epoxy powder
- mixing
- 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
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/80—Processes for incorporating ingredients
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/03—Powdery paints
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
The invention discloses a production process of double-layer epoxy powder, which comprises the following steps: s1, premixing the raw materials, weighing corresponding raw materials according to a formula, adding the weighed raw materials into stirring equipment for stirring and mixing, simultaneously adding corresponding additives, cleaning the stirring equipment by a cleaning device after mixing is finished, S2, performing melt extrusion mixing, putting the premixed materials into the melt mixing extrusion equipment for secondary mixing, ensuring that the components of each powder coating particle are the same, keeping the quality of the coating product stable, S3, cooling and granulating, immediately cooling strip-shaped plastic materials discharged from an extruder into cold water to form elastic strip-shaped products, and cutting the elastic strip-shaped plastic materials into granular materials by a granulator to obtain semi-finished products for crushing, wherein the raw materials comprise the following components: can stir epoxy powder's raw materials, can wash production facility simultaneously, and can retrieve the clout in the production process.
Description
Technical Field
The invention relates to the field of epoxy powder production and processing, in particular to a double-layer epoxy powder production process.
Background
The epoxy powder is a thermosetting non-toxic coating, forms a high molecular weight cross-linked structure coating after curing, has excellent chemical corrosion resistance and higher mechanical property, particularly has optimal wear resistance and adhesive force, is solid, has no solvent and pollution, has high powder utilization rate, and is a high-quality corrosion-resistant coating for buried steel pipelines.
However, the existing epoxy powder cannot stir the raw materials of the epoxy powder in the production and manufacturing process, the raw materials of the epoxy powder are not sufficiently mixed, the production equipment cannot be cleaned, waste materials are easily accumulated in the production equipment, and the excess materials in the production process cannot be recycled, so that the waste of resources is caused.
Disclosure of Invention
The invention mainly aims to provide a double-layer epoxy powder production process which can effectively solve the problems in the background technology.
In order to achieve the purpose, the invention adopts the technical scheme that:
a production process of double-layer epoxy powder comprises the following steps:
s1, premixing the raw materials, weighing the corresponding raw materials according to the formula, adding the weighed raw materials into stirring equipment, stirring and mixing, adding the corresponding additives, and cleaning the stirring equipment by a cleaning device after mixing;
s2, melt extrusion mixing, namely putting the premixed materials into melt mixing extrusion equipment for secondary mixing, ensuring that the components of each powder coating are the same, and keeping the quality of the coating product stable;
s3, cooling and granulating, wherein the strip-shaped plastic material from the extruder is immediately cooled in cold water to become an elastic strip-shaped product, and the elastic strip-shaped product is cut into granular materials by a granulator to obtain a semi-finished product for crushing;
s4, crushing and grading sieving, namely, putting the granular materials into a crusher for crushing, conveying the crushed granular materials into a screening machine through a conveying device, and screening the granular materials through the screening machine to conveniently screen the granular materials with the same specification and size;
s5, recovering excess materials, wherein a lot of excess materials are generated in the crushing and sieving processes, and the excess materials are pumped into a recovery tank through a pumping device and a pumping pipe, so that the excess materials are recycled;
s6, packaging the product, wherein the thermoplastic powder coating is generally not afraid of pressure and is not easy to be affected with damp, the product is packaged by a kraft paper bag with a polyethylene plastic lining, and the finished product needs to be stored in a storehouse with good air drying and ventilation and is required to be far away from a fire source and a heat source.
Preferably, the stirring device in the step S1 is composed of a stirring tank, a motor, a stirring shaft and stirring blades, the top of the stirring tank is provided with a feeding hopper, and the raw materials of the epoxy powder are composed of phenolic aldehyde modified epoxy resin, a curing agent, a leveling agent, a degassing agent, a curing accelerator, mesolite, phthalocyanine blue, titanium dioxide and precipitated barium sulfate.
Preferably, the temperature of the extrusion in the step S2 is divided into a first zone temperature and a second zone temperature, the first zone temperature is 105-113 ℃, the second zone temperature is 90-99 ℃, the material is extruded in the extruder through the first zone temperature zone and then through the second zone temperature zone, and the extrusion speed is 800Z/S.
Preferably, the extruder in step S3 can divide the head into a right-angle head and an oblique-angle head according to the material flow direction of the head and the included angle of the central line of the screw, the extruder is a screw extruder, the screw extruder depends on the pressure and the shearing force generated by the rotation of the screw, so that the material can be fully plasticized and uniformly mixed, the material is molded through a die, and the cooling time of the extruded material is half an hour.
Preferably, in the step S4, the pulverizer is driven by a strong airflow through high-speed shearing and hammering, and the powder is filtered by a stainless steel screen to obtain the required powder, the pulverizer is provided with a dust collector, so that the pulverizer is free from powder pollution, has the characteristics of low temperature, low noise, high efficiency and the like, is suitable for pulverizing dry brittle materials, and is provided with screens with different apertures, so that granular materials with the same specification and size can be conveniently screened.
Preferably, the pumping device comprises an exhaust fan, a connecting pipe and a connector in the step S5, the connecting pipe is fixed with the recovery tank through the connector, the exhaust fan and the recovery tank can be connected, the pumping pipe is used for connecting the recovery tank with the sieving device, and a sealing device is arranged between the recovery pipe and the sieving device and between the recovery tank and the sieving device.
Preferably, the sealing of the kraft paper bags in step S6 is performed by a sealing machine, so that the sealing property of the kraft paper bags can be ensured.
Preferably, the stirring shaft of the stirring device in the step S1 is connected with a cleaning brush, the cleaning brush is connected with the stirring shaft through a connecting rod, and the cleaning brush is in contact with the inner wall of the stirring tank of the stirring device.
Compared with the prior art, the invention has the following beneficial effects: stirring equipment can stir epoxy powder's raw materials, can make epoxy powder's raw materials mix more abundant, and belt cleaning device can wash production facility simultaneously, has improved production facility's cleanliness, and clout recovery unit can retrieve the clout in the production process, can guarantee the inside cleanness of production facility on the one hand, can carry out recycle to the clout simultaneously.
Drawings
FIG. 1 is a schematic view of a process flow of a double-layer epoxy powder production process of the present invention;
FIG. 2 is a schematic flow diagram of the pre-mixing of raw materials for a dual layer epoxy powder process of the present invention;
FIG. 3 is a schematic view of the crushing and multi-stage sieving process of a double-layer epoxy powder production process according to the present invention;
FIG. 4 is a schematic flow diagram of the excess material recovery of the double-layer epoxy powder production process of the present invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
Examples
A production process of double-layer epoxy powder comprises the following steps:
s1, premixing the raw materials, weighing the corresponding raw materials according to the formula, adding the weighed raw materials into stirring equipment, stirring and mixing, adding the corresponding additives, and cleaning the stirring equipment by a cleaning device after mixing;
s2, melt extrusion mixing, namely putting the premixed materials into melt mixing extrusion equipment for secondary mixing, ensuring that the components of each powder coating are the same, and keeping the quality of the coating product stable;
s3, cooling and granulating, wherein the strip-shaped plastic material from the extruder is immediately cooled in cold water to become an elastic strip-shaped product, and the elastic strip-shaped product is cut into granular materials by a granulator to obtain a semi-finished product for crushing;
s4, crushing and grading sieving, namely, putting the granular materials into a crusher for crushing, conveying the crushed granular materials into a screening machine through a conveying device, and screening the granular materials through the screening machine to conveniently screen the granular materials with the same specification and size;
s5, recovering excess materials, wherein a lot of excess materials are generated in the crushing and sieving processes, and the excess materials are pumped into a recovery tank through a pumping device and a pumping pipe, so that the excess materials are recycled;
s6, packaging the product, wherein the thermoplastic powder coating is generally not afraid of pressure and is not easy to be affected with damp, the product is packaged by a kraft paper bag with a polyethylene plastic lining, and the finished product needs to be stored in a storehouse with good air drying and ventilation and is required to be far away from a fire source and a heat source.
A process for producing a double-layer epoxy powder as illustrated in fig. 1: and in the step S1, the stirring equipment consists of a stirring tank, a motor, a stirring shaft and stirring blades, the top of the stirring tank is provided with a feed hopper, and the raw materials of the epoxy powder consist of phenolic aldehyde modified epoxy resin, a curing agent, a leveling agent, a degassing agent, a curing accelerator, mesolite, phthalocyanine blue, titanium dioxide and precipitated barium sulfate.
A process for producing a double-layer epoxy powder as illustrated in fig. 1: the temperature of the extrusion in the step S2 is divided into a first zone temperature and a second zone temperature, wherein the first zone temperature is 105-113 ℃, the second zone temperature is 90-99 ℃, the material is extruded in the extruder through the first zone temperature zone and then through the second zone temperature zone, and the extrusion speed is 800Z/S.
A process for producing a double-layer epoxy powder as illustrated in fig. 1: in the step S3, the extruder can divide the head into a right-angle head and an oblique-angle head according to the material flow direction of the head and the included angle of the central line of the screw, the extruder is a screw extruder, the screw extruder depends on the pressure and the shearing force generated by the rotation of the screw, so that the material can be fully plasticized and uniformly mixed, the material is molded through the die, and the cooling time of the extruded material is half an hour.
A process for producing a double-layer epoxy powder as illustrated in fig. 1: in the step S4, the pulverizer is driven by strong airflow through high-speed shearing and hammering, the required powder is obtained by filtering through a stainless steel screen, the pulverizer is provided with a dust suction device, powder pollution is avoided, the pulverizer has the characteristics of low temperature, low noise, high efficiency and the like, dry brittle materials are pulverized, screens with different apertures are arranged in the screening machine, and granular materials with the same specification and size can be screened conveniently.
A process for producing a double-layer epoxy powder as illustrated in fig. 4: the pumping device comprises an exhaust fan, a connecting pipe and a connector in the step S5, the connecting pipe is fixed with the recovery tank through the connector, the exhaust fan and the recovery tank can be connected, the pumping pipe connects the recovery tank with the sieving device, and a sealing device is arranged between the recovery pipe and the sieving device and between the recovery tank.
A process for producing a double-layer epoxy powder as illustrated in fig. 1: and in the step S6, sealing the kraft paper bags by a sealing machine, so that the tightness of the kraft paper bags can be ensured.
A process for producing a double-layer epoxy powder as illustrated in fig. 1: and in the step S1, a cleaning brush is connected to the stirring shaft of the stirring equipment, the cleaning brush is connected with the stirring shaft through a connecting rod, and the cleaning brush is in contact with the inner wall of the stirring tank of the stirring equipment.
It should be noted that, in the production process of the double-layer epoxy powder, when in use, corresponding raw materials are weighed according to a formula, the weighed raw materials are added into stirring equipment for stirring and mixing, so that the raw materials of the epoxy powder can be more fully mixed, meanwhile, corresponding additives are added, after the mixing is finished, the stirring equipment is cleaned through a cleaning device, the stirring equipment drives a cleaning brush to clean, the cleanliness of the production equipment is increased, the premixed materials are put into melting mixing extrusion equipment for secondary mixing, the components of each powder coating are ensured to be the same, the quality of the coating product is kept stable, strip-shaped plastic materials from an extruder immediately enter cold water for cooling, the strip-shaped plastic materials are changed into elastic strip-shaped products, the elastic strip-shaped products are cut into granules through a granulator to obtain semi-finished products for crushing, the granular materials are firstly put into a crusher for crushing, the granular material after smashing passes through conveyor and carries to the sieve separator in, sieve granular material through the sieve separator, conveniently select the same granular material of specification size, smash and sieve the in-process and have a lot of clouts production, pump the clout through pumping device and pumping pipe and send the clout to the recovery jar in, realize carrying out recycle to the clout, avoid appearing the waste of resource, thermoplastic powder coating is not afraid of generally to be pressed, also be difficult for weing, the kraft paper bag with the polyethylene plastic inside lining is packed, air drying need be deposited in to the finished product of packing, in the storehouse that ventilates well, and keep away from fire source and heat source, realize epoxy's production and processing.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (8)
1. The production process of the double-layer epoxy powder is characterized by comprising the following steps of:
s1, premixing the raw materials, weighing the corresponding raw materials according to the formula, adding the weighed raw materials into stirring equipment, stirring and mixing, adding the corresponding additives, and cleaning the stirring equipment by a cleaning device after mixing;
s2, melt extrusion mixing, namely putting the premixed materials into melt mixing extrusion equipment for secondary mixing, ensuring that the components of each powder coating are the same, and keeping the quality of the coating product stable;
s3, cooling and granulating, wherein the strip-shaped plastic material from the extruder is immediately cooled in cold water to become an elastic strip-shaped product, and the elastic strip-shaped product is cut into granular materials by a granulator to obtain a semi-finished product for crushing;
s4, crushing and grading sieving, namely, putting the granular materials into a crusher for crushing, conveying the crushed granular materials into a screening machine through a conveying device, and screening the granular materials through the screening machine to conveniently screen the granular materials with the same specification and size;
s5, recovering excess materials, wherein a lot of excess materials are generated in the crushing and sieving processes, and the excess materials are pumped into a recovery tank through a pumping device and a pumping pipe, so that the excess materials are recycled;
s6, packaging the product, wherein the thermoplastic powder coating is generally not afraid of pressure and is not easy to be affected with damp, the product is packaged by a kraft paper bag with a polyethylene plastic lining, and the finished product needs to be stored in a storehouse with good air drying and ventilation and is required to be far away from a fire source and a heat source.
2. The process for producing a double-layer epoxy powder according to claim 1, wherein: and in the step S1, the stirring equipment consists of a stirring tank, a motor, a stirring shaft and stirring blades, the top of the stirring tank is provided with a feed hopper, and the raw materials of the epoxy powder consist of phenolic aldehyde modified epoxy resin, a curing agent, a leveling agent, a degassing agent, a curing accelerator, mesolite, phthalocyanine blue, titanium dioxide and precipitated barium sulfate.
3. The process for producing a double-layer epoxy powder according to claim 1, wherein: the temperature of the extrusion in the step S2 is divided into a first zone temperature and a second zone temperature, wherein the first zone temperature is 105-113 ℃, the second zone temperature is 90-99 ℃, the material is extruded in the extruder through the first zone temperature zone and then through the second zone temperature zone, and the extrusion speed is 800Z/S.
4. The process for producing a double-layer epoxy powder according to claim 1, wherein: in the step S3, the extruder can divide the head into a right-angle head and an oblique-angle head according to the material flow direction of the head and the included angle of the central line of the screw, the extruder is a screw extruder, the screw extruder depends on the pressure and the shearing force generated by the rotation of the screw, so that the material can be fully plasticized and uniformly mixed, the material is molded through the die, and the cooling time of the extruded material is half an hour.
5. The process for producing a double-layer epoxy powder according to claim 1, wherein: in the step S4, the pulverizer is driven by strong airflow through high-speed shearing and hammering, the required powder is obtained by filtering through a stainless steel screen, the pulverizer is provided with a dust suction device, powder pollution is avoided, the pulverizer has the characteristics of low temperature, low noise, high efficiency and the like, dry brittle materials are pulverized, screens with different apertures are arranged in the screening machine, and granular materials with the same specification and size can be screened conveniently.
6. The process for producing a double-layer epoxy powder according to claim 1, wherein: the pumping device comprises an exhaust fan, a connecting pipe and a connector in the step S5, the connecting pipe is fixed with the recovery tank through the connector, the exhaust fan and the recovery tank can be connected, the pumping pipe connects the recovery tank with the sieving device, and a sealing device is arranged between the recovery pipe and the sieving device and between the recovery tank.
7. The process for producing a double-layer epoxy powder according to claim 1, wherein: and in the step S6, sealing the kraft paper bags by a sealing machine, so that the tightness of the kraft paper bags can be ensured.
8. The process for producing a double-layer epoxy powder according to claim 1, wherein: and in the step S1, a cleaning brush is connected to the stirring shaft of the stirring equipment, the cleaning brush is connected with the stirring shaft through a connecting rod, and the cleaning brush is in contact with the inner wall of the stirring tank of the stirring equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911195391.6A CN110819157A (en) | 2019-11-28 | 2019-11-28 | Production process of double-layer epoxy powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911195391.6A CN110819157A (en) | 2019-11-28 | 2019-11-28 | Production process of double-layer epoxy powder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110819157A true CN110819157A (en) | 2020-02-21 |
Family
ID=69543070
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911195391.6A Pending CN110819157A (en) | 2019-11-28 | 2019-11-28 | Production process of double-layer epoxy powder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110819157A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113352663A (en) * | 2021-06-16 | 2021-09-07 | 泰安科鼎特工贸有限公司 | Strapping rope production process |
| CN114591595A (en) * | 2021-12-31 | 2022-06-07 | 泰州市瑞康再生资源利用有限公司 | Method for preparing resin wood-grain board by using organic resin reclaimed material |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1733853A (en) * | 2005-06-01 | 2006-02-15 | 兰州理工大学 | FBE pnenolic aldehyde modified epoxy powder coating and its preparation method |
| CN110128151A (en) * | 2019-04-30 | 2019-08-16 | 浙江琰大新材料有限公司 | A kind of manufacture craft of light thermal-shield refractory castable |
-
2019
- 2019-11-28 CN CN201911195391.6A patent/CN110819157A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1733853A (en) * | 2005-06-01 | 2006-02-15 | 兰州理工大学 | FBE pnenolic aldehyde modified epoxy powder coating and its preparation method |
| CN110128151A (en) * | 2019-04-30 | 2019-08-16 | 浙江琰大新材料有限公司 | A kind of manufacture craft of light thermal-shield refractory castable |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113352663A (en) * | 2021-06-16 | 2021-09-07 | 泰安科鼎特工贸有限公司 | Strapping rope production process |
| CN114591595A (en) * | 2021-12-31 | 2022-06-07 | 泰州市瑞康再生资源利用有限公司 | Method for preparing resin wood-grain board by using organic resin reclaimed material |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN207140159U (en) | A kind of efficient plastic crushing grading plant | |
| CN205364278U (en) | A high -efficient granulator for plastics processing | |
| CN204412423U (en) | A kind of stalk crasher for the production of wood plastic composite | |
| CN110819157A (en) | Production process of double-layer epoxy powder | |
| CN104277353A (en) | Method for producing PVC pipe | |
| CN106513134B (en) | Plastic particle processing device | |
| CN110387096A (en) | Regenerated PVC pipe preparation method can be recycled in one kind | |
| CN206853855U (en) | A kind of straw millstone for being used to produce wood moulding aluminum matrix composite | |
| CN108515638A (en) | A kind of technics of reclaim of plastic waste reuse method | |
| CN113878744A (en) | Plastic color master batch production equipment | |
| CN107186923A (en) | A kind of plastic breaker | |
| CN208392410U (en) | A kind of plastic pellet screening plant | |
| CN207310316U (en) | Twin-screw extrusion water spray Water ring granulator | |
| CN204952832U (en) | Circulation rotary granulator | |
| CN206170417U (en) | Prilling granulator that plastics manufacture was used | |
| JP3771847B2 (en) | Molding method of waste plastic | |
| CN217257610U (en) | Multistage cutting device based on ultra-high molecular weight polyethylene granulator | |
| CN109719859A (en) | The technique new method of solid-liquid mixing granulation in production control | |
| CN113559994B (en) | Crushing and drying integrated equipment for pig feed processing | |
| CN220030871U (en) | Waste material processing apparatus is used in rubber production | |
| CN205853149U (en) | A kind of high efficiency cutting plastic granulator | |
| CN204894280U (en) | Heat is moulded modified master batch flow direction of packaging line of tubular product and is cut grain collection device | |
| CN213732788U (en) | Granulator for rubber production | |
| CN109203284A (en) | A kind of high adaptation prilling granulator of plastic products processing | |
| CN210233648U (en) | Plastics breaker of recycling is retrieved in mill |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20200221 |
|
| WD01 | Invention patent application deemed withdrawn after publication |