JP3131820U - Dust collection net and collection device - Google Patents

Abstract

Disclosed is a dust collection net and a collection device capable of collecting a wide range of dust with high efficiency by using electrostatic charging.
A collection net is formed in a net-like structure using a thermoplastic resin having a negatively charged electrostatic property and is a net as an air friction net that can be negatively charged by friction with air passing through the net. It has the material 2 and the adhesive layer 3 by which an adhesive is apply | coated to this net | network material 2. FIG. The collection net is charged by friction with air. For this reason, dust is attracted actively and dust is collected efficiently.
[Selection] Figure 2

Description

  The present invention relates to a dust collection net and a collection device for collecting and adsorbing dust in a factory or the like.

  2. Description of the Related Art In automobile body painting factories and the like, a collection sheet for collecting and adsorbing dust is installed in order to prevent dust from adhering to the painted surface of a vehicle body. As such a collecting sheet, there has heretofore been a sheet in which a coating film made of an adhesive is formed on the surface of the sheet, as disclosed in JP-A-63-93372.

  JP-A-2000-61227, JP-A-2002-233800, and JP-A-2004-314008 are technologies previously developed by the applicant, and all show a collection sheet having an adhesive layer on the surface. Has been. Among these, the collection sheet of JP2000-61227A forms a pressure-sensitive adhesive layer except for the dry portions at both edges in the longitudinal direction of the surface, and covers the upper surface of the pressure-sensitive adhesive layer with a release sheet. The collection sheet is peeled off the release sheet after being fixed to the wall surface or floor surface with an adhesive tape or nail using the dry portion.

  The collection sheet of JP-A-2002-233800 is obtained by applying an adhesive to a net-like substrate. Since the net-like substrate has a net structure, it has good air permeability and high dust collection efficiency. In addition, the collection sheet is transported while being covered with a release sheet for convenience during transportation. By making the collection sheet into a net shape, the contact area with the release sheet is reduced and the peelability is improved.

  The collection sheet of JP-A-2004-314008 is an improvement of the mesh structure of JP-A-2002-233800. This collection sheet has a specific network structure, thereby increasing the coating area of the pressure-sensitive adhesive and improving the collection efficiency.

  On the other hand, conventionally, an apparatus for collecting dust using static electricity has been developed. For example, as disclosed in Japanese Patent Laid-Open No. 2002-047627, a propeller member (20) protrudes from the surface of the perforated electrostatically charged panel (16) so as to be rotatable by wind pressure. In the propeller member, the fiber material (18) is implanted so as to contact the surface of the perforated electrostatically charged panel by the rotation of the propeller member, and the fiber material and the perforated electrostatically charged panel are rubbed by the rotation of the propeller member. Static electricity is generated. Dust in the air is attracted to the perforated electrostatically charged panel by the generated static electricity.

  There are also known a dust removal method using a chemically processed chemical mop, a vacuum cleaner equipped with a brush that easily generates negative ions, and a statically charged blade (Japanese Patent Laid-Open No. 9-75285).

  However, in the conventional dust collector using electrostatic charging (Japanese Patent Laid-Open No. 2002-047627), a propeller member having a fiber material is provided on a perforated electrostatic charging panel in order to exert an electrostatic charging effect. By arranging and rotating this propeller member by wind pressure, the fiber material was rubbed against the perforated electrostatic charging panel to generate static electricity. For this reason, in order to generate static electricity in the entire perforated electrostatically charged panel, it is necessary to dispose a large number of complicated propeller members on the entire perforated electrostatically charged panel, which is expensive. In addition, with the use of electrostatic charging (Japanese Patent Laid-Open No. 9-75285) and mops, the cleaning aid is merely a means for removing dust in a narrow range.

  The inventor of the present application eagerly searched for a simple collection means that can collect a wide range of dust with higher efficiency based on a conventional mesh collection sheet and a dust collection device using electrostatic charging.

  The present invention has been made in view of such circumstances, and intends to provide a dust collection net and a collection device capable of easily and efficiently collecting a wide range of dust using electrostatic charging. To do.

  The dust collection net of the present invention is an air friction net that can be negatively charged by friction with air that is formed in a network structure using a thermoplastic resin having electrostatic characteristics that is negatively charged and passes through the network, And a pressure-sensitive adhesive layer formed by applying a pressure-sensitive adhesive to the air friction net.

  The present invention focuses on the fact that dust tends to be positively charged due to friction with air, and uses a thermoplastic resin that has negative electrostatic properties due to friction with air as a material for the collection net that collects dust. ing. Here, the “electrostatic property” refers to a property that a thermoplastic resin is charged by friction with air.

  The air friction net has a mesh structure and is formed using a material having electrostatic characteristics that is negatively charged by friction with air.

  The air friction net has a large number of meshes having air permeability. For this reason, dust passes through the mesh together with air while being charged positively by friction with air. Since the air friction net is formed of a material having electrostatic characteristics that is negatively charged by friction with air, the air friction net is negatively charged by friction with air passing through the mesh. Therefore, the air friction net actively attracts positively charged dust passing through the mesh by negative static electricity.

  Further, the air friction net has a good air flowability due to its mesh structure, and has a large contact area with air. Therefore, the collection net exhibits electrostatic characteristics that are negatively charged by friction with air. Moreover, the chance of contact with dust floating in the air increases, and the dust is attracted efficiently.

  Thus, the network structure of an air friction net | network is a structure which is easy to rub with air, and can demonstrate the electrostatic characteristic of a thermoplastic resin effectively.

  Furthermore, the air friction net has a pressure-sensitive adhesive layer formed on a mesh-like base material. For this reason, the dust attracted to the air friction net by static electricity adheres to the adhesive layer and is reliably collected.

  Moreover, the collection net | network of this invention may coat | cover with a peeling sheet previously, when conveying to an installation place. In this case, since the collection net is a network structure, the contact area with the release sheet is smaller than that of the plate-like body. For this reason, a peeling sheet can be smoothly peeled from a collection net.

  Here, in the present invention, when static electricity is generated in the dust collector, static electricity is generated in the air friction net by friction of the collection net, which is a collector, with the air. On the other hand, in Japanese Patent Application Laid-Open No. 2002-047627, the propeller is rotated by wind pressure, whereby the fiber material is rubbed against the perforated electrostatic charging panel to generate static electricity in the perforated electrostatic charging panel. Therefore, the mechanism for generating static electricity is friction with air in the present invention, and in Japanese Patent Application Laid-Open No. 2002-047627, it is friction with a friction material, and both have different techniques for generating static electricity.

  In the present invention, it is not necessary to install a plurality of static electricity generators such as a propeller member and a fiber material in the entire collector when generating dust in the dust collector. In the present invention, the air friction net has a mesh, has a large area in contact with the air, and further, the air and the friction are repeated by the circulation of the air. For this reason, the air friction net is frictionally charged with air flowing through the mesh and is negatively charged. Therefore, the collection net can be constantly charged negatively without requiring a large-scale device, and can actively attract dust. Moreover, the attracted dust is reliably collected by the adhesive layer. Therefore, it is possible to collect dust more easily and efficiently than Japanese Patent Application Laid-Open No. 2002-047627.

  The thermoplastic resin forming the air friction net has an initial frictional voltage (meaning absolute value; the same shall apply hereinafter) of 0.5 kV or more and a half-life of 50, as measured in accordance with JIS L1094: 1997 method. It is more than 1 second, It is preferable that it is 1 or more types chosen from the group of polyester, polyethylene, polyvinyl chloride, polyvinylidene chloride, and a fluororesin. In this case, strong static electricity can be generated in the collection net, and dust can be more actively attracted.

  The pressure-sensitive adhesive layer has an electrostatic property that is negatively charged, and has an initial frictional band voltage (absolute value) of 0.5 kV or more and a half-life of 50 seconds or more as measured in accordance with the JIS L1094: 1997 method. It is preferable that it consists of a certain acrylic resin. In this case, electrostatic characteristics are exhibited not only by the air friction net but also by the adhesive layer. Therefore, strong static electricity can be generated in the collection net, and dust can be attracted more actively.

  There is also a dust collecting device characterized by having a collection net and a vibration generator for applying vibration to the collection net.

  According to this collection device, the collection net is forcibly vibrated, so that it is rubbed against the air and strongly electrostatically charged negatively. For this reason, dust can be attracted more positively, and the collection performance is further improved.

  Further, the vibration generator only needs to have a mechanism for continuously vibrating the collection net, and a simple device is sufficient. Therefore, the conventional large-scale drive source is not required. Therefore, power consumption can be kept low.

  As described above, according to the present invention, since the collection net has a mesh structure, there is a large area in contact with air. In addition, the collection net constantly rubs against the air due to air circulation. Since the air friction net is formed using a material having electrostatic characteristics that is negatively charged by friction with air, it is negatively charged by friction with air. For this reason, the air friction net can be constantly charged negatively without requiring a large-scale device, and can actively attract dust. The attracted dust is reliably collected by the adhesive layer.

  Further, since the collection net is spread over a relatively wide range, a wide range of dust can be collected.

  Therefore, according to the present invention, it is possible to provide a collection net and a collection device for dust that can collect a wide range of dust with high efficiency by using electrostatic charging.

  The dust collection net of the present invention has an insulating air friction net formed in a network structure using a thermoplastic resin, and an adhesive layer formed by applying an adhesive to the air friction net.

  The thermoplastic resin forming the air friction net has an electrostatic property that is negatively charged. This thermoplastic resin has an initial frictional voltage of 0.5 kV or more and a half-life of 50 seconds or more as measured according to JIS L1094: 1997 method. The thermoplastic resin is measured by the shape of the material. The shape of the material is a plate-like body, a sheet-like body, or a fabric. Here, the “initial frictional charging voltage” is a charging voltage measured by rubbing with a friction cloth while rotating a test piece in accordance with a method defined in JIS L1094 method (1997). The average value of the test results. According to the method defined in the JIS L1094 method (1997), “the half-life of the charged voltage” means that the charged voltage is reduced to ½ after the test piece is charged in the corona discharge field. This is a value obtained by measuring time.

  When the initial frictional voltage is less than 0.5 kV, the collection performance of the collection net may be reduced. A more preferable initial frictional voltage is 1.0 kV or more.

  If the half-life of the charged voltage is less than 50 seconds, the collection performance of the collection net may be reduced. A more preferable half-life is 120 seconds or more.

  As the thermoplastic resin having electrostatic characteristics, polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride, polyester, acrylic, fluorine resin, or the like is used. These are negatively charged by friction with air, have an overwhelmingly high charge amount, and have a long half-life. For this reason, strong static electricity characteristics can be exhibited and dust can be actively attracted. Examples of polyvinyl chloride include soft polyvinyl chloride and hard polyvinyl chloride. Hard polyvinyl chloride is preferable because it has a higher electrostatic property and a higher collection effect. As the fluororesin, it is preferable to use polytetrafluoroethylene (hereinafter referred to as “PTFE”).

  The collection net has a negatively charged electrostatic property, and preferably has an initial frictional voltage of 0.5 kV or more as measured in accordance with the JIS L1094: 1997 method. In this case, it is effectively negatively charged due to friction with air, and positively charged dust can be actively attracted, thereby exhibiting excellent collection performance. More preferably, the frictional voltage is 0.5 kV or higher, desirably 1.0 kV or higher. Thereby, stronger static electricity can be generated and dust can be attracted strongly.

  The half-life of the charging voltage of the collection net is preferably 0.5 seconds or more as measured according to the JISL 1094: 1997 method. In this case, the collection net can be continuously charged. More preferably, the half-life is 1 second or longer, desirably 10 seconds or longer. Thereby, the sustainability of static electricity is further improved.

  The air friction net is formed by knitting a thread made of a thermoplastic resin into a mesh shape. The yarn is preferably a monofilament from the viewpoint of air permeability, but may be a multifilament, a staple or an aggregate thereof (twisted yarn or the like).

  As shown in FIGS. 2 and 4, the mesh structure of the air friction net is formed by connecting a plurality of warp knitting portions 22 each having a loose loop 21 connected in a chain shape and adjacent warp knitting portions 22 horizontally. It is preferable to have a weft portion 23 that forms a mesh 20 between the warp knitting portions 22 and a bridging portion 24 that is formed in the mesh 20 by crossing the yarn diagonally or in an X shape. In this case, not only the mesh 20 but also the warp knitted portion 22 has good air permeability, and the friction with the air increases the chance of contact with dust contained in the air. Further, since the mesh 20 is partitioned diagonally or in an X shape by the bridging portion 24, it becomes easy to collect dusts of various sizes, which are floating in the air.

  For example, as shown in FIGS. 2 and 5, the pressure-sensitive adhesive layer 3 is formed on the warp knitted portion 22 of the air friction net, and is formed so as to close a part of the mesh 20. When an oblique or X-shaped bridging portion is formed in the mesh, the X-shaped bridging portion is more likely to form a film-like pressure-sensitive adhesive layer in the mesh than in the oblique bridging portion. Here, the pressure-sensitive adhesive layer is preferably formed so as to open at least a part so as not to fill all the meshes of the air friction net. This is because, when the entire mesh is filled with the adhesive layer, the air permeability of the collection net is lowered, and the dust collection performance may be lowered.

  The pressure-sensitive adhesive layer can be formed by applying a pressure-sensitive adhesive to the air friction net using a brush, a roller, or the like. The material of the pressure-sensitive adhesive layer is preferably an acrylic pressure-sensitive adhesive having the same electrostatic characteristics as the material of the air friction net. In this case, the pressure-sensitive adhesive layer can be negatively charged, and the dust collection efficiency is further improved.

  The collection net is preferably vibrated by a vibration generator.

  The vibration generator preferably applies a continuous vibration having a vibration frequency of 10 to 600 times / minute and a vibration width of 3 to 500 mm to the collection net. When the number of vibrations is less than 10 times / minute or when the vibration width is less than 3 mm, the amount of static electricity generated in the collection net may be reduced. When the number of vibrations exceeds 600 times / minute or when the vibration width exceeds 500 mm, the vibration is too strong and it is difficult for dust to adhere to the collection net.

  More preferably, the number of vibrations of the vibration generator is 20 to 100 times / minute, and the vibration width of the vibration generator is 20 to 100 mm. In this case, strong static electricity can be generated by friction with air, and dust collection efficiency is further improved.

  The vibration generator vibrates the collection net in a direction such as up and down, left and right, and front and rear. The vibration generator has, for example, a motor and a crank that converts the rotational motion of the motor into a reciprocating motion, and connects the collection net to the crank. Alternatively, the vibration generator may be a high-frequency generator and may transmit high-frequency vibrations to the collection net by contacting the collection net. Further, the collection net can be vibrated by a vibration generator such as an electric vibrator or an air vibrator.

  In transporting the collection net to the installation location, it is preferable to cover the surface of the collection net with a release sheet for convenience of transportation. The release sheet may be a film made of polyethylene, polyester, OPP, CPP or the like, or a kraft paper, high-quality paper, etc. laminated with a polyolefin-based or other synthetic resin film. Among these, it is preferable to use polyethylene. This is because the release sheet made of polyethylene is hydrophobic and has its surface peelable. Further, a release agent may be applied to the release sheet surface. As the release agent, it is preferable to use a non-silicon system. Silicone release agents have good releasability, but when installed in an automobile paint factory, there is a possibility that a phenomenon such as the paint being repelled on the painted surface may result in a defective product.

  Examples of the present invention will be described in comparison with comparative examples.

Example 1
As shown in FIGS. 1 and 2, the dust collection net 1 of this example includes a net material 2 formed in a network structure using a thermoplastic resin having a negatively charged electrostatic property, and a net material. 2 and the pressure-sensitive adhesive layer 3 applied to the substrate 2. The collection net 1 is vibrated by a vibration generator 8.

  The net material 2 is an air friction net that can be negatively charged by friction with air passing through the mesh. The thermoplastic resin forming the net material 2 is hard polyvinyl chloride having electrostatic characteristics that are negatively charged.

  As shown in FIG. 2, the net material 2 is formed by knitting a monofilament (500 denier) made of hard polyvinyl chloride into a mesh shape with a Russell type knitting machine. The mesh structure of the net material 2 is such that a plurality of warp knitting portions 22 in which loose loops 21 are connected in a chain shape and adjacent warp knitting portions 22 are connected horizontally to form a mesh 20 between the warp knitting portions 22. A weft portion 23 to be formed and a bridging portion 24 formed by obliquely crossing a monofilament at the center of the mesh 20. The thickness D of the warp knitting portion 22 is 1.1 mm ± 0.2 mm, and the dimension L of the mesh 20 is 5 mm ± 1 mm. The outer dimension of the net material is 1 m × 1 m.

  As shown in FIG. 2, the pressure-sensitive adhesive layer 3 is formed on the filament surface of the net material 2. In the warp knitting portion 22 of the net material 2, a gentle loop 21 is formed, and the adhesive layer 3 is formed in a film shape in some of the loops 21. The pressure-sensitive adhesive layer 3 is formed not only in the loop 21 but also on the surface of the filament constituting the warp knitting portion 22, the weft yarn portion 23 and the end passing portion 24 so as to cover the filament. The pressure-sensitive adhesive layer 3 is formed by applying an acrylic pressure-sensitive adhesive to the net material 2.

  As shown in FIG. 1, the collection net 1 has an outer frame 11 that supports the net material 2 and a wire 12 that extends the outer frame 11 from the ceiling 5 at the installation location.

  The collection net 1 is vibrated in the vertical direction by a vibration generator 8. Between the wire 12 and the outer frame 11, a spring portion 13 that holds the outer frame 11 while allowing vertical vibration is interposed.

  The vibration generator 8 is installed on the floor surface 6 below the collection net 1. As shown in FIG. 3, the vibration generator 8 includes a motor 81, a crankshaft 82 that converts the rotation of the motor 81 into a reciprocating motion in the vertical direction, and a housing 85 that accommodates these. One end of the crankshaft 82 is rotatably supported with respect to the housing 85 via a bearing 84. The crankshaft 82 is connected to the outer frame 11 of the collection net 1 by a connecting rod 83. The vibration generator 8 applies continuous vibration with a vibration frequency of 50 times / minute and a vibration width of 50 mm to the collection net 1 in the vertical direction.

  In installing the collection net 1, the surface is covered with a polyethylene release sheet in advance and transported to the site. After installation, the release sheet is peeled from the collection net.

(Example 2)
This example is the same as Example 1 except that the net material is made of monofilament yarn (400 denier) made of polyethylene.

(Comparative Example C1)
This example is the same as Example 1 except that the net is made of monofilament (480 denier) made of 6-nylon.

(Comparative Example C2)
This comparative example is the same as Example 1 except that the net material is made of copper wire (diameter 0.25 mm).

(Examples 1-a, 2-a, Comparative examples C1-a, C2-a)
In this example, the collection net used in Examples 1 and 2 and Comparative Examples C1 and C2 is in a stationary state without being vibrated. Examples corresponding to Examples 1 and 2 and Comparative Examples C1 and C2 are referred to as Example 1-a, Example 2-a, Comparative Example C1-a, and Comparative Example C2-a in this order.

(Comparative Examples 1-b and 2-b, Comparative Examples C1-b and C2-b)
In this example, the net materials of Examples 1 and 2 and Comparative Examples C1 and C2 are spread at the installation place without applying an adhesive. The net material is given vertical vibrations similar to those in the above-described examples and comparative examples. Examples corresponding to Examples 1 and 2 and Comparative Examples C1 and C2 are referred to as Comparative Example 1-b, Comparative Example 2-b, Comparative Example C1-b, and Comparative Example C2-b in this order.

(Comparative Examples 1-c, 2-c, Comparative Examples C1-c, C2-c)
In this example, the net materials of Examples 1 and 2 and Comparative Examples C1 and C2 are spread on the installation site in a stationary state without applying an adhesive and without applying vibration. As examples corresponding to Examples 1 and 2 and Comparative Examples C1 and C2, they are referred to as Comparative Example 1-c, Comparative Example 2-c, Comparative Example C1-c, and Comparative Example C2-c in this order.

(Experimental example 1)
The electrostatic characteristics of the net material used in the dust collecting apparatus of the present invention were measured together with a comparative example.

  Materials used for the net material according to the present invention include rigid polyvinyl chloride (sample 1), PTFE (sample 2), acrylic (sample 3), polyethylene (sample 4), polyester (sample 5), soft polyvinyl chloride ( Sample 6), urethane (sample 7), and polypropylene (sample 8) were used. As comparative materials, 6-nylon (sample 9), wool (sample 10), cotton (sample 11), natural rubber (sample 12), cedar (sample 13), true chu (sample 14), copper (sample 15) ), Aluminum (sample 16), stainless steel (sample 17), and zinc (sample 18).

  The friction charge voltage and the half life of the charge voltage of the above materials were measured according to JISL 1094 (1997). The material was used for measurement in the form of a plate, sheet or cloth.

  In measuring the frictional voltage of the material, the test piece was attached to a rotating drum of a frictional voltage measuring machine and rotated to be rubbed with the friction cloth. This measured the electrostatic charge generated in the material.

  When measuring the half-life of the charged voltage of the material, after removing the material, it was placed on the turntable of the half-life measuring machine, and after applying the voltage of (+) 10 kV for 30 seconds while rotating the turntable The application was stopped. While the turntable was rotated as it was, the charged voltage was measured over time. Then, the time (s) until the charged voltage was attenuated to 1/2 of the initial charged voltage was recorded.

  The measurement results of the frictional voltage and half-life of the material are shown in Table 1.

  From the table, the net material (samples 1 to 8) used in the dust collecting device of the present invention is a thermoplastic resin, and all of them are negatively charged. Rigid polyvinyl chloride (sample 1), PTFE (sample 2), acrylic (sample 3), and polyethylene (sample 4) have a friction voltage (absolute value) as large as 1.0 kV or more and a half-life of 120 seconds or more. It was long.

  In contrast, 6-nylon (sample 9) and natural materials and metals (sample 10-18) were positively charged. 6-Nylon is a thermoplastic resin, but is considered to be positively charged due to its hydrophilicity. The wool of sample 10 was positively charged and had a long half-life, but the other samples 11 to 18 had a small charged voltage.

(Experimental example 2)
The friction voltage and the half-life of the voltage of the collection net (sample A) and net material (sample B) of Example 1 were measured in the same manner as in Experimental Example 1. The measurement results are shown in Table 2.

  As known from the table, the frictional voltage of the net material was -2.1 kV and the half-life was 20 seconds. The collection net formed by applying an acrylic adhesive to the net material had a frictional band voltage of 1.1 kV and a long half-life of 120 seconds or more. From this, it is understood that the net material and the collection net have a property of being strongly long and negatively charged.

  The half-life of the collection net with the adhesive (sample A) was longer than that of the collection net without the adhesive (sample B). The frictional voltage of the collection net with adhesive (sample A) was lower than that of the collection net without adhesive (sample B).

  The net material used for the collection net is formed using hard polyvinyl chloride. Compared to the case of a plate-like body (Sample 1 in Table 1), the net material showed a lower value than the net material made of hard polyvinyl chloride. This is because the net material has a mesh structure, and the area and volume occupied by the projected material per unit area are smaller than the plate-like body. For this reason, it is considered that the net material has a narrow chargeable region and a relatively small value of the charged voltage and the half-life compared to the plate-like body.

(Experimental example 3)
Several materials used in Experimental Example 1 were selected, and the change with time of the air frictional voltage was measured.

  The material used for the measurement was a plate or cloth as in Experimental Example 1. In the measurement, the test piece was attached to the rotating drum of the frictional voltage measuring machine used in Experimental Example 1, and rotated without being in contact with the friction cloth. In this case, the material is rubbed with air and static electricity is generated. This charged voltage was measured after 5 minutes and 15 minutes. The measurement results are shown in Table 3.

  As is known from the table, polyester and hard polyvinyl chloride were more strongly charged by air friction than other materials, and kept charged for a long time.

(Experimental example 4)
The number of dust deposits of the collection devices of the above examples and comparative examples was measured.

  As described above, an acrylic adhesive was applied to the collection net, and the collection net was continuously vibrated with a vibration frequency of 50 times / minute and a vibration width of 50 mm.

  For the measurement, the collection net was installed in the area adjacent to the space of the automobile factory painting booth. The collection nets were spread vertically in the area. In addition, in order to eliminate errors in the stretching conditions, the stretching positions were periodically changed. The number of dust deposits after 3 months was counted. Counting the number of attached dust was performed with a 40 × magnifier (hand type). For each sample, 10 fields of view (1 field of view = about 1 in the mesh) were measured, and the average value per field of view was taken as the number of dust deposits.

  The measurement results of Examples 1 and 2 and Comparative Examples C1 and C2 are shown in Table 4. The measurement results of Examples 1-a and 2-a and Comparative Examples C1-a and C2-a are shown in Table 5. The measurement results of Comparative Examples 1-b, 2-b, C1-b, and C2-b are shown in Table 6. Table 7 shows the measurement results of Comparative Examples 1-c, 2-c, C1-c, and C2-c.

  As is known from Tables 4 to 7, when hard polyvinyl chloride or polyethylene was used as the net material, the number of dust adhered was larger than when 6-nylon or copper wire was used. This is because rigid polyvinyl chloride and polyethylene are thermoplastic insulators and have a property of being negatively charged by friction with air (Table 1). For this reason, it is considered that these thermoplastic resins actively attracted dust contained in the surrounding air.

  On the other hand, the number of 6-nylon dust deposits was smaller than that of hard polyvinyl chloride and polyethylene. Rigid polyvinyl chloride and polyethylene have the property of being negatively charged, and 6-nylon has the property of being positively charged (Table 1). Most of the dust is hair, fiber waste, and earth and sand, which tend to be positively charged. For this reason, as shown in FIG. 2, it is considered that a large amount of dust 4 is attached to the net material 2 made of hard polyvinyl chloride or polyethylene which tends to be negatively charged. In particular, hard polyvinyl chloride had a higher number of dust deposits than other materials.

  When the collection net was vibrated (Tables 4 and 6), the number of dust adhered was larger than that in the stationary state (Tables 5 and 7). This is considered to be because the electrostatic charge amount of the collection net is increased and more dust is attracted by vibrating the collection net.

  When the adhesive was applied to the net material (Tables 4 and 5), the number of adhered dusts was significantly higher than when the adhesive was not applied (Tables 6 and 7). From this, it was found that dust was reliably collected by the adhesive.

  In addition, also about the net material which uses polyester and PTFE as a raw material, when the number of dust adhesion was measured, the result close | similar to polyethylene (Example 2, 2-a, comparative example 2-b, 2-c) was obtained. Moreover, when stainless steel and zinc (wire) were used, similar results to copper wires (Comparative Example C2, Comparative Examples C2-a, C2-b, C2-c) were obtained.

  In addition, when a similar test was conducted by adding cotton yarn (20'S x 2 twisted yarn, 0.3mmΦ) as a net material separately, the number of dust adhered was slightly more than copper wire and less than nylon. It was.

  From the above, as a material for the net material, thermoplastic resins such as polyethylene, polyester, and fluororesin, including hard polyvinyl chloride, have a negative electrostatic property. Moreover, since the net material has a mesh structure, it can be seen that dust can be actively attracted by air convection and can exhibit excellent collection performance.

  The dust collection net and collection device of the present invention can be installed not only in automobile painting factories, but also in factories that manufacture precision machinery, electrical equipment, foods, and the like.

It is explanatory drawing of the dust collection apparatus of Example 1. FIG. It is explanatory drawing of the collection net | network of Example 1. FIG. 3 is an explanatory diagram of a vibration generator according to Embodiment 1. FIG. It is mesh | network structure of the net | network material (air friction net | network) of this invention, Comprising: It is explanatory drawing which shows the case where it has a bridging part which cross | intersects mesh | network. It is mesh | network structure of the collection net | network of this invention, Comprising: It is explanatory drawing which shows the case where it has a bridge part which cross | intersects mesh | network in X shape.

Explanation of symbols

  1 is a collection net, 11 is an outer frame, 2 is a net material (air friction net), 20 is a mesh, 21 is a loop, 22 is a warp knitting part, 23 is a weft part, 24 is a bridging part, 3 is an adhesive layer , 8 represents a vibration generator.

Claims (4)

  An air friction net that is formed in a network structure using a thermoplastic resin having a negatively charged electrostatic property and can be negatively charged by friction with air passing through the network, and an adhesive is applied to the air friction net A dust collection net characterized by having an adhesive layer.   The thermoplastic resin forming the air friction net has an initial frictional voltage (absolute value) of 0.5 kV or more and a half-life of 50 seconds or more as measured according to JIS L1094: 1997 method. 2. The dust collection net according to claim 1, which is at least one selected from the group consisting of polyester, polyethylene, polyvinyl chloride, polyvinylidene chloride, and fluororesin.   The pressure-sensitive adhesive layer has an electrostatic property that is negatively charged, and has an initial frictional band voltage (absolute value) of 0.5 kV or more and a half-life of 50 seconds or more as measured in accordance with the JIS L1094: 1997 method. The dust collection net according to claim 1 or 2, comprising an acrylic resin.   An apparatus for collecting dust or the like, comprising: the collection net according to any one of claims 1 to 3; and a vibration generator that applies vibration to the collection net.

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