CN108516163B - Process for eliminating static electricity of polyvinyl chloride powder - Google Patents
Process for eliminating static electricity of polyvinyl chloride powder Download PDFInfo
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- CN108516163B CN108516163B CN201810153930.9A CN201810153930A CN108516163B CN 108516163 B CN108516163 B CN 108516163B CN 201810153930 A CN201810153930 A CN 201810153930A CN 108516163 B CN108516163 B CN 108516163B
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- polyvinyl chloride
- chloride powder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B63/00—Auxiliary devices, not otherwise provided for, for operating on articles or materials to be packaged
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Abstract
The invention discloses a process for eliminating static electricity of polyvinyl chloride powder, which comprises the steps of humidifying polyvinyl chloride powder from the upstream after airflow drying in an inlet pipe of a vibrating screen for the first time, then performing vibrating screening and blanking to a secondary conveying pipeline, humidifying the polyvinyl chloride powder in the secondary conveying pipeline for the second time, and then packaging the polyvinyl chloride powder in a packaging bin. The process improves the packaging field environment, the packaging machine discharges materials smoothly, the weighing effect is good, and the defects that the package is full and the weighing is not qualified are avoided.
Description
Technical Field
The invention relates to a polyvinyl chloride (PVC) conveying and packaging process, in particular to a process for eliminating static electricity of polyvinyl chloride powder.
Background
PolyVinyl Chloride (PVC) is a polymer material in which one chlorine atom is substituted for one hydrogen atom in polyethylene. PVC is white powder with an amorphous structure and has small branching degree. The molecular weight of the PVC produced industrially is generally within the range of 5-12 ten thousand, and the PVC has larger polydispersity, and the molecular weight is increased along with the reduction of polymerization temperature. Without a fixed melting point, the material begins to soften at 80-85 ℃, becomes viscoelastic state at 130 ℃, and begins to change into viscous state at 160-180 ℃. The tensile strength is about 60MPa, and the impact strength is 5-10 kJ/m2(ii) a Has excellent dielectric properties.
The existing industrial production method of PVC is a suspension method, and the polymerized slurry is dried to obtain PVC powder, and then the PVC powder is screened and conveyed to a packaging machine for packaging. PVC powder resistivity is great, can produce static in air current drying and powder transportation process, and electrified dust produces very big influence to PVC's packing, when water content control was low when (being less than or equal to 0.1%), can cause phenomenons such as packagine machine unloading difficulty, full bag and dust scattering in the packaging process, not only seriously influences the environment, still leads to appearing weighing phenomenon that is unsatisfactory.
Disclosure of Invention
In order to solve the defects of the prior art, the invention aims to provide the process for eliminating the static electricity of the polyvinyl chloride powder, which improves the packaging field environment, ensures that the blanking of a packaging machine is smooth, has good weighing effect and avoids the defects of full packaging and unsatisfactory weighing.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a process for eliminating the static electricity generated by powdered polyvinyl chloride includes such steps as primary humidifying the powdered polyvinyl chloride, vibration screening, discharging to secondary pipeline, secondary humidifying, and loading in packing bin.
When PVC powder is dried by adopting air flow, because PVC resistivity is larger and static electricity is easy to generate, when the PVC powder with the static electricity is subjected to vibration screening, the phenomena of difficult material passing, material leakage and the like can be caused, and meanwhile, the vibrated PVC powder generates more friction, so that the PVC powder generates the static electricity, and the static electricity influence of the PVC powder is serious. Although one-time humidification can eliminate the static electricity of the PVC powder, the inventor of the invention finds that the phenomena of difficult blanking, full bag and dust flying of a packaging machine still occur in the packaging process in the actual production. Through further research, the generation of static electricity can be eliminated due to the existence of water after the first humidification, but in the vibration process, the volatilization of partial water is accelerated due to friction, so that the friction static electricity can be generated in the process of conveying the PVC powder through a secondary conveying pipeline during blanking, and the packaging difficulty is caused.
The invention also provides a system for realizing the process, which comprises a vibrating screen, a blanking device, a secondary conveying pipeline and a packaging material bin which are sequentially connected, wherein a first humidifying device is arranged in an inlet pipeline of the vibrating screen, a second humidifying device is arranged in the secondary conveying pipeline, an inlet of the first humidifying device is connected with a first steam pipeline, and an inlet of the second humidifying device is connected with a second steam pipeline.
The invention also aims to provide the application of the process in preparing polyvinyl chloride.
The invention has the beneficial effects that:
1. after the process is adopted, the environment of a packaging site is improved, the blanking of the packaging machine is smooth, the weighing effect is good, and the phenomena that the packaging is full and the weighing is not qualified are avoided.
2. The process of the invention has small change range to the existing process and reduces the modification cost.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The humidification of this application is to adding a certain amount of water in the material, the process of increase material humidity.
As introduced in the background art, the defects of difficult blanking, full bag, dust flying and the like of a packaging machine in the packaging process exist in the prior art, and in order to solve the technical problems, the application provides a process for eliminating the static electricity of the polyvinyl chloride powder.
The application provides a typical implementation mode of a process for eliminating polyvinyl chloride powder static electricity, wherein polyvinyl chloride powder which is dried by airflow from the upstream is humidified for the first time in an inlet pipe of a vibrating screen, then is subjected to vibrating screening and blanking to a secondary conveying pipeline, and the polyvinyl chloride powder in the secondary conveying pipeline is humidified for the second time and then enters a packaging bin for packaging.
When adopting the pneumatic drying PVC powder, because the PVC resistivity is great, produce static easily, when the PVC powder that has static carries out the shale shaker, can cause the material difficulty, phenomenon such as race material, the PVC powder through the vibration has produced more friction simultaneously, thereby further make the PVC powder produce static, thereby the static influence that leads to the PVC powder is serious, therefore this application has carried out humidification for the first time in the inlet tube of shale shaker, through humidification for the first time, firstly, polyvinyl chloride powder has been eliminated because the static of pneumatic drying production behind the humidification, secondly, because the existence of water makes polyvinyl chloride surface can not take place the charge redistribution, thereby the static that produces when having prevented the shale shaker. Although one-time humidification can eliminate the static electricity of the PVC powder, the inventor of the application finds that the phenomena of difficult blanking, full bag and dust flying of a packaging machine still occur in the packaging process in the actual production. Through further research discovery, although the existence of water can the production of static elimination after humidification for the first time, nevertheless in the vibration process, because the volatilization of partial moisture has been accelerated to the friction results in for the PVC powder can produce the friction static at the unloading in-process of secondary conveying pipeline transport, has caused the difficulty of packing, therefore this application has carried out the humidification for the second time in secondary conveying pipeline, has prevented that the PVC powder from producing the friction static at secondary conveying pipeline.
Preferably, the first humidification is to introduce 0.3-0.4 MPa of steam into an inlet pipe of the vibrating screen.
Preferably, in the first humidification, the amount of water added is such that the polyvinyl chloride powder contains 0.15 to 0.35 mass% of water.
Preferably, the second humidification is to introduce 0.2 +/-0.01 MPa of steam into an inlet pipe of a secondary conveying line.
Further preferably, the second humidification of the polyvinyl chloride powder is carried out after the steam introduced into the secondary transfer line is atomized.
Further preferably, the size of atomized liquid drops of the steam after atomization is 2-8 mm.
Preferably, the outlet direction of the second humidification is perpendicular to the conveying direction of the polyvinyl chloride powder. If the outlet direction of the humidification is the same as the conveying direction of the polyvinyl chloride powder, the polyvinyl chloride powder is difficult to be uniformly mixed with water, the amount of the humidified water is increased, and the product quality of the polyvinyl chloride powder is reduced. If the outlet direction of humidification is opposite to the conveying direction of polyvinyl chloride powder, so that the polyvinyl chloride powder is in countercurrent contact with water, the polyvinyl chloride powder can be easily and uniformly mixed with the water, but the conveying of the polyvinyl chloride powder is hindered, and meanwhile, part of the polyvinyl chloride powder can be hindered by a humidifying device, so that the normal production of the process is influenced. This application adopts perpendicular humidification, and the water of humidification makes polyvinyl chloride powder spiral advance in secondary pipeline, not only can with make polyvinyl chloride powder easily with water misce bene, can not disturb the transport of polyvinyl chloride powder moreover.
Preferably, in the second humidification, the amount of water added is such that the polyvinyl chloride powder contains 0.15 to 0.35 mass% of water.
Another embodiment of this application provides a system for realize above-mentioned technology, including shale shaker, glassware, secondary conveying line, the packing feed bin that connects gradually, is equipped with first humidification device in the inlet pipeline of shale shaker, is equipped with second humidification device in the secondary conveying line, the first steam pipeline of first humidification device's access connection, second humidification device's access connection second steam pipeline.
Preferably, the second humidifying device is an atomizing device.
Further preferably, the spraying direction of the atomization device is perpendicular to the flow direction of the polyvinyl chloride.
In a third embodiment of the present application, there is provided a use of the above process for preparing polyvinyl chloride.
In order to make the technical solutions of the present application more clearly understood by those skilled in the art, the technical solutions of the present application will be described in detail below with reference to specific examples and comparative examples.
Examples
A process for eliminating polyvinyl chloride powder static electricity comprises a vibrating screen, a blanking device, a secondary conveying pipeline and a packaging material bin which are sequentially connected, wherein a first humidifying device is arranged in an inlet pipeline of the vibrating screen, an atomizing device is arranged in the secondary conveying pipeline, an inlet of the first humidifying device is connected with a first steam pipeline, an inlet of the atomizing device is connected with a second steam pipeline, and the spraying direction of the atomizing device is perpendicular to the flowing direction of polyvinyl chloride.
And humidifying the polyvinyl chloride powder which is dried by the airflow from the upstream for the first time in an inlet pipe of the vibrating screen, then vibrating and screening, blanking to a secondary conveying pipeline, humidifying the polyvinyl chloride powder in the secondary conveying pipeline for the second time, and then packaging in a packaging bin.
The first humidification is to introduce 0.3 MPa steam into an inlet pipe of a vibrating screen.
In the first humidification, the amount of water is added so that the polyvinyl chloride powder contains 0.15 to 0.35 mass% of water.
The second humidification is to introduce 0.2MPa of steam into the inlet pipe of the secondary conveying pipeline.
And the steam added into the secondary conveying pipeline is atomized to carry out secondary humidification on the polyvinyl chloride powder.
The size of the atomized droplets of the steam atomized was 6 mm.
The outlet direction of the second humidification is vertical to the conveying direction of the polyvinyl chloride powder.
In the second humidification, the water is added so that the polyvinyl chloride powder contains 0.15 to 0.35 mass% of water.
Through the improvement, the packaging field environment is improved, the blanking of the packaging machine is smooth, the weighing effect is good, and the phenomena that the packaging bag is full and the weighing is not qualified are avoided.
Comparative example 1
The difference is that the first humidification is performed only in the inlet duct of the vibrating screen and no humidification is performed in the secondary transfer line, as in the example.
The PVC powder is rubbed with the pipe wall in the conveying process to generate static electricity, so that the subsequent packaging is difficult.
Comparative example 2
The same as in the example, except that the humidification was not performed in the inlet pipe of the vibrating screen, the humidification was performed only in the secondary transfer line (the same as the second humidification in the example)
Static electricity is generated during sieving to cause the phenomena of difficult sieving, material leakage and the like of materials.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (6)
1. A technology for eliminating the static electricity of polyvinyl chloride powder is characterized in that polyvinyl chloride powder which is dried by airflow from the upstream is humidified for the first time in an inlet pipe of a vibrating screen, then is subjected to vibrating screening and blanking to a secondary conveying pipeline, and the polyvinyl chloride powder in the secondary conveying pipeline is humidified for the second time and then enters a packing bin for packing; the outlet direction of the second humidification is vertical to the conveying direction of the polyvinyl chloride powder; wherein, the steam added into the secondary conveying pipeline is atomized to carry out secondary humidification on the polyvinyl chloride powder; in the second humidification, adding water to enable the water content of the polyvinyl chloride powder to reach 0.15-0.35%; the first humidification is to introduce 0.3-0.4 MPa of steam into an inlet pipe of the vibrating screen; in the first humidification, adding water to enable the water content of the polyvinyl chloride powder to reach 0.15-0.35%; the second humidification is to introduce 0.2 +/-0.01 MPa of steam into an inlet pipe of a secondary conveying pipeline.
2. The process for eliminating static electricity in polyvinyl chloride powder according to claim 1, wherein the size of atomized liquid drops of the steam after atomization is 2-8 mm.
3. A system for realizing the process of any one of claims 1 or 2, which is characterized by comprising a vibrating screen, a blanking device, a secondary conveying pipeline and a packaging material bin which are connected in sequence, wherein a first humidifying device is arranged in an inlet pipeline of the vibrating screen, a second humidifying device is arranged in the secondary conveying pipeline, an inlet of the first humidifying device is connected with a first steam pipeline, and an inlet of the second humidifying device is connected with a second steam pipeline.
4. A system according to claim 3, wherein the second humidification means is an atomisation device.
5. The system of claim 4, wherein the spray direction of the atomization device is perpendicular to the flow direction of the polyvinyl chloride.
6. Use of a process according to any one of claims 1 or 2 for the preparation of polyvinyl chloride.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810153930.9A CN108516163B (en) | 2018-02-22 | 2018-02-22 | Process for eliminating static electricity of polyvinyl chloride powder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810153930.9A CN108516163B (en) | 2018-02-22 | 2018-02-22 | Process for eliminating static electricity of polyvinyl chloride powder |
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| Publication Number | Publication Date |
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| CN108516163A CN108516163A (en) | 2018-09-11 |
| CN108516163B true CN108516163B (en) | 2020-07-17 |
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| CN101066157A (en) * | 2007-03-28 | 2007-11-07 | 云南昆船设计研究院 | Tunnel type heating and moistening machine spraying steam in two sides |
| CN205998178U (en) * | 2016-08-27 | 2017-03-08 | 瑞阳制药有限公司 | Eliminate flexible package fill powder quick-fried powder powder spreading device |
| CN206766387U (en) * | 2017-05-07 | 2017-12-19 | 龙岩新奥生物科技有限公司 | A kind of barrel-shaped dress sodium butyrate packing device |
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