JP2020000972A - Resin mesh element, resin wire and surface treatment method of these - Google Patents

Abstract

To provide a resin mesh element and a resin wire where a phenomenon that a treating object is attached to a resin mesh element is suppressed and sieve clogging and the like can be suppressed when predetermined treatment such as sieving, filtering or the like is performed to the treatment object such as particulate matter, a powdery material and the like and to provide a surface treatment method of the resin mesh element and the resin wire.SOLUTION: In the surface treatment method of a resin mesh element and a resin wire according to the present invention, fine flaws are generated by fine shot blast treatment on the contact surface of the resin mesh element used for a portion contacting with a material to be treated and the arithmetic average roughness (Ra) of the contact surface is 0.3-1.2 μm. In the resin mesh element and the resin wire according to the present invention, the fine flaws are generated on the contact surface contacting with the material to be treated and the arithmetic average roughness (Ra) of the contact surface is 0.3-1.2 μm.SELECTED DRAWING: Figure 12

Description

  The present invention relates to a resin sieve for sieving (classifying) an object to be treated such as a granular substance or a powdery substance, or a resin sieve used for filtering an object to be treated. The present invention relates to a filter, a mesh element (net-like element) used for the sieve or the filter, a mesh element (net-like element) used for other purposes, a resin wire used for these, and a surface treatment method for these.

  2. Description of the Related Art Conventionally, for example, weaving a metal sieve (a metal wire rod) for powder (powder substance: powder) or granular substance such as flour, potato starch, constarch, matcha powder, cocoa powder, powdered sugar, powder medicine, and the like. Sieve using a mesh element composed of, for example, for classification, decoration, charging into a measuring instrument, and the like.

  As the metal sieve, for example, a sieve in which a mesh-like element (mesh element) obtained by knitting metal wires with a predetermined gap (opening) therebetween and extending over the bottom surface of the cylindrical element, or a handle, is used. There are various types such as handy type sieves.

Japanese Utility Model Laid-Open No. Hei 5-18680 Japanese Patent Application No. 2017-048308

  Here, when the above-mentioned granular substance or powdery substance (hereinafter also simply referred to as powdery substance or object to be processed) is sieved, the powdery substance adheres to the mesh element (net-like element) and There is a fact that a phenomenon (clogging) that closes a gap (a mesh or a sieve) therebetween frequently occurs within a short time from the start of work.

  In addition, in order to suppress abrasion, a wire mesh having a wear-resistant material such as ceramic fixed to the upper surface of the mesh (a material contact portion) has been proposed, as in a wire mesh for a sieve described in Patent Document 1.

  However, according to experiments by the inventors, it has been confirmed that when the powdery substance is sieved, even if the wire is covered with ceramics or the like, clogging due to the adhesion of the powdery substance is not effective.

  For this reason, the applicant of the present application has conducted various researches and experiments, and as a result, in Patent Document 2, a large number of fine projections are formed by a fine shot blasting process in a contact area in contact with a granular substance or a powdery substance. A metal mesh element (sieving element) and a metal mesh element capable of suppressing a phenomenon in which a particulate substance or a powdery substance adheres to a metal mesh element for sieving (wire mesh for sieving), thereby suppressing clogging of the sieve. Suggested a sieve.

  By the way, the same clogging problem as described above also exists in the case of a resin sieve, but in the case of a resin sieve, there is a point that it is required to manufacture the sieve relatively inexpensively, and so on. It is not compatible with the cost increase due to coating, etc. It also has the problem that it is easy to peel off due to the application of a hard coating on the surface of a relatively soft resin. : Powder) or particulate matter.

  However, resin sieves are extremely useful if clogging of the sieves can be suppressed by forming a large number of fine projections by fine shot blasting or the like in a contact area with a powdery substance or the like to be processed. This can contribute to increasing the possibility of using the resin sieve for sieving small-sized powder (powder substance: powder) or granular substance.

  The present invention has been made in view of the above circumstances, and has a relatively simple and low-cost structure, and has a predetermined process such as sieving or filtering an object to be processed such as a granular substance or a powdery substance. When applying, the phenomenon in which the object to be treated adheres to the resin mesh element (screening screen or filtration screen) can be suppressed, and clogging of the screen (screen, screen, filter) can be suppressed. An object of the present invention is to provide a resin mesh element (net-like element) and a resin wire used for these elements. It is another object of the present invention to provide a surface treatment method for such a resin mesh element and a resin wire.

For this reason, the surface treatment method of the resin mesh element according to the present invention,
A fine flaw is formed by fine shot blasting on a contact surface of a resin mesh element used for a portion in contact with a substance to be treated, and the arithmetic average roughness (Ra) of the contact surface is 0.3 to 1.2 μm. It is characterized by doing.

The surface treatment method of the resin wire according to the present invention,
A fine flaw is formed by fine shot blasting on the contact surface of a resin wire used for a part in contact with the substance to be treated, and the arithmetic average roughness (Ra) of the contact surface is set to 0.3 to 1.2 μm. It is characterized by the following.

The resin mesh element according to the present invention,
A mesh element made of resin used in a portion that comes into contact with a substance to be treated, in which a fine flaw is formed on the contact surface, and the arithmetic average roughness (Ra) of the contact surface is 0.3 to 1.2 μm. It is characterized by the following.

  In the resin mesh element according to the present invention, the resin mesh element may include a crossed resin wire.

  In the resin mesh element according to the present invention, the resin wire may be a polyethylene wire.

  In the resin mesh element according to the present invention, the resin wire may be a nylon wire.

  In the resin mesh element according to the present invention, the fine scratches may be formed by fine shot blasting.

The resin wire according to the present invention,
A resin wire used for a part that comes into contact with a substance to be treated, wherein a fine flaw is formed on the contact surface, and the arithmetic average roughness (Ra) of the contact surface is 0.3 to 1.2 μm. It is characterized by.

  ADVANTAGE OF THE INVENTION According to this invention, when performing predetermined processings, such as sieving or filtering with respect to a to-be-processed object, such as a granular substance or a powdery substance, although it is a comparatively simple and low-cost structure, A resin mesh element (mesh element) capable of suppressing the phenomenon in which an object adheres to a resin mesh element (screening screen or filtration screen) and suppressing clogging of a screen (screen, mesh, filter). ), And a resin wire used for these. Further, according to the present invention, it is possible to provide a surface treatment method for such a resin mesh element and a resin wire.

FIG. 2 is an optical digital microscope image (50 ×) showing an unprocessed (before performing fine shot blasting) PP wire after the powdery substance adhesion test according to one embodiment of the present invention is performed. is there. It is an optical digital microscope image (50 times) which expands and shows the unprocessed PP wire before the adhesion test of the powdery substance which concerns on embodiment same as the above. It is the optical digital microscope image (50 times) which expands and shows the processed PP wire (after performing the fine shot blasting process) after performing the adhesion test of the powdery substance which concerns on embodiment same as the above. It is the optical digital microscope image (50 times) which expands and shows the processed PP wire rod before performing the adhesion test of the powdery substance which concerns on embodiment same as the above. It is an optical digital microscope image (50 times) which expands and shows the untreated nylon wire rod after performing the adhesion test of the powdery substance which concerns on embodiment same as the above. It is an optical digital microscope image (50 times) which expands and shows the untreated nylon wire before performing the adhesion test of the powdery substance which concerns on embodiment same as the above. It is an optical digital microscope image (50 times) which expands and shows the processed nylon wire rod after performing the adhesion test of the powdery substance which concerns on embodiment same as the above. It is an optical digital microscope image (50 times) which expands and shows the processed nylon wire rod before performing the adhesion test of the powdery substance which concerns on embodiment same as the above. It is a figure which shows the measurement result of the surface roughness (Ra) of the PP wire rod before and after performing the fine shot blast processing which concerns on embodiment. It is a figure which shows the surface shape data of each PP wire rod corresponding to the sample number 1-5 after performing the fine shot blast processing which concerns on embodiment. It is a figure which shows the surface shape data of each PP wire rod corresponding to the sample number 1-5 before performing the fine shot blast processing which concerns on embodiment. It is a laser microscope photograph (50 times) which expands and shows the surface of the PP wire after the fine shot blast processing which concerns on embodiment same as the above. It is a laser microscope photograph (50 times) which expands and shows the surface of the PP wire before the fine shot blasting process which concerns on embodiment same as the above. It is a figure which shows the measurement result of the surface roughness (Ra) of the nylon wire before applying the fine shot blasting process concerning embodiment same as the above. It is a figure which shows the surface-shape data of each nylon wire rod corresponding to the sample number 1-5 after performing the fine shot blast processing which concerns on embodiment. It is a figure which shows the surface shape data of each nylon wire rod corresponding to the sample number 1-5 before performing the fine shot blast processing which concerns on embodiment. It is a laser microscope photograph (100 times) which expands and shows the surface of the nylon wire rod after performing the fine shot blast processing which concerns on embodiment same as the above. It is a laser microscope photograph (100 times) which expands and shows the surface of the nylon wire before performing the fine shot blast processing which concerns on embodiment same as the above. It is a figure which shows the result of the tensile test regarding the PP wire rod which performed the fine shot blast processing which concerns on embodiment same as the above. It is a figure which shows the result of the tensile test regarding the nylon wire rod which performed the fine shot blast processing which concerns on embodiment same as the above.

  Hereinafter, an embodiment according to the present invention will be described with reference to the accompanying drawings. The present invention is not limited by the embodiments described below.

  Here, as described in Patent Document 2, the present inventors perform fine shot blasting on a metal sieve to form fine scratches (irregularities) on the surface of the member. When sifting powders such as starch, constarch, matcha powder, cocoa powder, powdered sugar and powdered medicine (powder substance: powder) or granular substances (hereinafter also referred to simply as powdery substance) New knowledge has been obtained that powder substances are less likely to adhere and clogging is eliminated.

  Then, in order to confirm the tensile strength, when a tensile test was performed on a metal wire rod subjected to fine shot blasting, it was confirmed that the tensile strength was higher than that of the untreated one. . This is presumed that, in the case of a metal wire, application of compressive stress to the metal surface acts as resistance.

  On the other hand, the present inventors have found that a resin sieve may be beneficial if it has a clogging suppression effect. Therefore, a resin wire for a resin sieve (for example, a PP wire "a polypropylene wire"). Was subjected to fine shot blasting to form numerous (innumerable) fine scratches (fine irregularities) on the surface in contact with the powdery substance (fine scratches (fine irregularities) were formed to make the surface matte) However, a new finding has been obtained that powdery substances are less likely to adhere and clogging is eliminated.

  However, when a tensile test was performed on the treated resin wire that had been subjected to fine shot blasting to check the tensile strength, the tensile strength was lower than that of the untreated resin wire. Was confirmed.

  For this reason, when performing fine shot blasting on a resin-made wire, it is necessary to consider processing conditions that can withstand the expected use method (usage mode).

  Therefore, the present inventors have conducted various researches and experiments, and as a result, have succeeded in finding processing conditions for a resin-made wire rod that can exert an effect of suppressing the adhesion of powdery substances while maintaining strength.

Hereinafter, preferable conditions when the resin wire is used for a resin sieve or another resin mesh element (net-like element) will be described.
FIG. 1 shows the experimental results of the present inventors.
When the arithmetic average roughness (Ra) of the resin wire surface was changed by changing the processing time of fine shot blasting and the specifications of the media, the degree of adhesion of the powdery material was confirmed.
A resin wire having fine scratches (fine irregularities) of about Ra = 0.3 to 1.2 μm on its surface (resin wire having a matte surface with fine scratches (fine irregularities)) is effectively powdery. It has been confirmed that the adhesion of the substance can be suppressed, and the clogging can be effectively suppressed when used for a resin sieve.

In addition, as an example of the resin wire according to the present embodiment, for example, a polypropylene wire (PP wire) can be used.
In the present embodiment, as a mesh-shaped element (mesh element: mesh element) 3 woven (crossed) between resin wire rods 1 with a predetermined gap (opening) 2 therebetween, for example, Daio Kasei Co., Ltd. An example is “Dio Crown Net” manufactured by a company, and the surface of the resin wire 1 (PP wire) was subjected to fine shot blasting. More specifically, the PP wire used in the present embodiment has a wire diameter of about φ240 and a rectangular shape (substantially square) of about 900 μm (0.9 mm). (See FIGS. 1 and 2).

Further, as another example of the resin wire according to the present embodiment, for example, a nylon wire can be used.
As a mesh element (net-like element) using the nylon wire according to the present embodiment, for example, “Nylon Mesh NAYTAL” manufactured by Swiss “SEFER” can be given as an example, and the resin wire 1 (nylon mesh) is used. Using a wire, a fine shot blasting process can be performed on the surface. More specifically, as the nylon wire used in the present embodiment, a wire having a wire diameter of about φ90 and a square (substantially square) of about □ 200 μm (0.2 mm) was used. (See FIG. 5, FIG. 6, etc.).

  1 and 2 show the degree of adhesion of the powdery substance of the PP wire "polypropylene wire" which has not been subjected to the fine shot blasting (hereinafter, also simply referred to as "untreated"). FIG. 1 is an optical digital microscope image (50 times) showing an enlarged unprocessed PP wire after a powdery substance adhesion test (a test of sieving the powdery substance), and FIG. It is an optical digital microscope image (50 times) which expands and shows the unprocessed PP wire before the adhesion test of a powdery substance is performed.

  FIGS. 3 and 4 show the degree of adhesion of the powdery substance of the PP wire “polypropylene wire” that has been subjected to the fine shot blasting (hereinafter, also simply referred to as “treated”). FIG. 3 is an enlarged optical digital microscope image (50 ×) showing the processed PP wire after the powdery substance adhesion test is performed, and FIG. 4 is a view before the powdery substance adhesion test is performed. It is the optical digital microscope image (50 times) which expands and shows the processed PP wire rod.

  5 and 6 show the degree of adhesion of the powdery substance to the untreated nylon wire. FIG. 5 is an optical digital microscope image (50 times) showing the untreated nylon wire rod after the powdery substance adhesion test is performed, and FIG. 6 is an optical digital microscope image before the powdery substance adhesion test. It is the optical digital microscope image (50 times) which expands and shows the nylon wire of a process.

  7 and 8 show the degree of adhesion of the powdery substance to the treated nylon wire. FIG. 7 is an optical digital microscope image (50 ×) showing an enlarged view of the treated nylon wire rod after performing the powdery substance adhesion test, and FIG. 8 is a process before performing the powdery substance adhesion test. It is an optical digital microscope image (50 times) showing an enlarged nylon wire.

  From these results, by performing fine shot blasting on a resin wire (for example, a PP wire “a polypropylene wire” or a nylon wire), powdery substances are less likely to adhere, and clogging and the like are eliminated. Was confirmed.

  When these resin wires (for example, PP wires "polypropylene wires" or nylon wires) are used as mesh elements (net-like elements) of screen doors or other filters (filtering elements such as air conditioner filters), It can contribute to prevention of adhesion of dust and dirt, and has advantages such as easy cleaning.

  Here, the surface roughness (arithmetic average roughness: Ra) of the (processed) resin wire after the fine shot blast processing according to the present embodiment is shown in comparison with the case of no processing. Keep it.

  As for the PP wire “polypropylene wire”, as shown in FIG. 9, the average value of the surface roughness (Ra) of the PP wire before the fine shot blast processing according to the present embodiment is 0.1366. On the other hand, the average value of the surface roughness (Ra) of the treated PP wire was 0.5536.

  FIG. 10 shows the surface shape data of each PP wire corresponding to the (processed) sample No. 1-5 after the fine shot blasting shown in FIG. FIG. 12 shows a laser microscope photograph (50 times) showing the surface of the treated PP wire rod in an enlarged manner.

  FIG. 11 shows the surface shape data of each PP wire corresponding to (unprocessed) sample No. 1-5 before performing the fine shot blasting process shown in FIG. FIG. 13 shows a laser microscope photograph (50 times) showing an enlarged surface of an untreated PP wire.

  On the other hand, as for the nylon wire, as shown in FIG. 14, the average value of the surface roughness (Ra) of the nylon wire before the fine shot blast treatment according to the present embodiment is 0.14. On the other hand, the average value of the surface roughness (Ra) of the treated nylon wire was 0.867.

  FIG. 15 shows the surface shape data of each nylon wire corresponding to (processed) sample No. 1-5 after performing the fine shot blasting process shown in FIG. Further, FIG. 17 shows a laser microscope photograph (100 times) showing the surface of the treated nylon wire rod in an enlarged manner.

  FIG. 16 shows surface shape data of each nylon wire corresponding to (untreated) sample No. 1-5 before performing the fine shot blasting process shown in FIG. Further, FIG. 18 shows a laser microscope photograph (100 times) showing the surface of an untreated nylon wire rod in an enlarged manner.

  Further, a tensile test was performed on a resin wire (PP wire) having fine scratches (fine irregularities) formed on the surface thereof by applying a fine shot blasting process, and as shown in FIG. 19, Ra = 0. A resin wire (PP wire) material having fine scratches (fine irregularities) of about 0.4 to 0.8 μm and further about 0.3 to 1.2 μm formed on the surface can maintain a predetermined strength. It was confirmed that the processed value was within the range of the untreated variation, and at the same time, it was confirmed that the effect of suppressing the adhesion of the powdery substance could be exhibited at a high level.

  Similarly, when a tensile test was performed on a resin wire (nylon wire) having fine scratches (fine irregularities) formed in a satin pattern on the surface by performing a fine shot blast treatment, as shown in FIG. A resin wire (nylon wire) having fine scratches (fine irregularities) of about 0.7 to 1.0 μm, further about 0.3 to 1.2 μm formed on the surface can maintain a predetermined strength. It was confirmed that the processed value was within the range of the untreated variation, and at the same time, the effect of suppressing the adhesion of the powdery substance could be exhibited at a high level.

  As described above, according to the present embodiment, a resin wire having fine scratches (fine unevenness) formed on the surface thereof in a satin shape by performing a predetermined fine shot blasting process (arithmetic averaging of the contact surface with the object to be processed) According to the resin wire rod whose roughness (Ra) is roughened to about 0.3 to 1.2 μm, the effect of suppressing the adhesion of the powdery substance can be exerted at a high level while maintaining a predetermined tensile strength.

  In other words, according to the present embodiment, it is possible to perform a predetermined process such as sieving or filtering an object to be processed such as a granular substance or a powdery substance while having a relatively simple and low-cost configuration. In addition, a resin mesh capable of suppressing a phenomenon in which an object to be treated adheres to a resin mesh element (a sieve net or a filtration net), thereby suppressing clogging of sieves (screen, mesh, filter). An element (net-like element) and a resin wire used for these elements can be provided. Further, according to the present embodiment, it is possible to provide a surface treatment method for such a resin mesh element and a resin wire.

  Here, here, a measure different from the concept of making the powdery substance slippery with respect to the surface of the resin wire (the contact surface, the contact area with the sieve object), that is, the contact of the resin wire, The powdery material is unlikely to slip on the surface, but roughening the surface of the wire (the contact area with the sieve object) with fine scratches makes it difficult for the powdery material to adhere to the contact surface of the resin wire. The knowledge that clogging is eliminated is based on the finding that the surface (contact surface, contact area with the sieve object) of a resin wire is roughened (roughened) by fine scratches (fine protrusions, fine protrusions), It is considered that the presence of the compound reduces the contact area between the powdery substance (particles) and the wire, thereby reducing the intermolecular force.

That is, the method for suppressing powder adhesion according to the present invention is established by reducing the intermolecular force between the powder and the mating surface (here, for example, a mesh element, a wire, or the like).
In other words, it is intended to suppress adhesion and improve sliding by forming composite fine projections (convex) on the mating surface and reducing the contact area with the powder.
Here, as a specific example of a method of randomly forming countless fine protrusions (fine scratches, fine irregularities) on the surface of a resin wire rod in a countless (patterned) shape, a case in which a fine particle blast (fine shot blast) treatment is performed explain.

  In the present embodiment, when a PP wire is used as the resin wire 1, a wire having a wire diameter of about φ240 μm is used as shown in FIG. A mesh element (net-like element) 3 knitted (intersecting) at a predetermined gap 2 (aperture) of about 900 μm.

  Further, in the present embodiment, when a nylon wire is used as another example of the resin wire 1, as shown in FIG. 4, a wire having a wire diameter of about φ90 μm is used, and the wire 1 is mesh-sized. A mesh element (net-like element) 3 was knitted (intersecting) at # 70 (a predetermined gap 2 (opening) of the wire 1 was about 200 μm).

  The fine shot blasting performed in the present embodiment was performed by injecting fine particles (fine blasting medium) using a fine shot blasting device and causing them to collide with the resin wire 1.

  The fine shot blasting process according to the present embodiment is a process in which fine particles having specifications (material, shape, size, etc.) that are predetermined according to the purpose are formed on the surface of a resin product (wire, mesh element, mesh element, etc.). Is mixed with a compressible gas and subjected to high-speed collision to form fine scratches (irregularities) on the surface (to make the surface matte with many fine scratches (irregularities)).

  Specifically, the fine particles (fine shot blasting media) used in the fine shot blasting process have a polygonal shape in order to easily damage the surface of the wire 1, and are made of silicon carbide, alumina, or the like. Fine particles (blasting media) of ceramics such as ceramics can be used.

  For example, as an example of media for fine shot blasting (also referred to as precision blasting or microblasting), easily available (commercially available) SiC (silicon carbide) -based and alumina-based fine particles (mesh size # 400 ~ About $ 8000).

  The fine shot blasting process according to the present embodiment was performed by injecting fine particles (fine blasting medium) from an injection device as described below and causing the fine particles to collide with the mesh element 3 (resin wire 1).

  In the present embodiment, the fine shot blast processing is performed on the mesh element 3 formed by knitting the resin wire 1, but after the fine shot blast processing is performed on the resin wire 1 first, It is also possible to knit in a mesh shape.

(Injection device)
For example, various types of pneumatic blasting devices can be used. For example, compressed air is supplied into a tank into which shots (media for fine blasting) are charged, and conveyed by the compressed air. Direct pressure type blasting device that injects shots from a blast gun by applying it to a separately provided compressed air flow, gravity type blasting device that ejects shots dropped from a tank onto compressed air, generated by compressed air injection Various blasting devices such as a suction type blasting device which sucks a shot by the negative pressure and injects the shot with the compressed air can be used.

[Shot (media for fine shot blast)]
The shot (media for fine shot blasting) used in the present invention has a hardness equal to or higher than that of a metal product to be subjected to fine shot blasting, and is made of beads of SiC (silicon carbide), alumina, and high-speed steel. 6 (A) and 6 (B) (see FIG. 6 (A) and FIG. 6 (B)), for example, a JIS abrasive having a particle size of about 3000 and an average particle size distribution of about 4 μm can be used. If necessary, three or more types of approximate particle sizes can be mixed and used.

  The shot (fine shot blasting medium) (group) is mixed with compressed air by the above-described injection device, and for example, an injection pressure of 0.1 to 0.2 MPa, an injection speed of 100 to 200 m / sec, and an injection distance of 100 mm to At 250 mm, intermittent injection is performed for 0.1 to 1 second. That is, the injection of 0, 1 to 1 second is preferably performed repeatedly at intervals of 0.5 to 5 seconds, and fine projections are randomly formed on the surface of the processing target (mesh element 3 or wire 1). Form many.

  FIG. 4 shows, in the present embodiment, a part of a mesh element 3 (knitted with a PP-made wire) having fine scratches (fine irregularities) formed in a satin-like shape on the surface by fine shot blast processing, magnified 50 times. An optical digital microscope image is shown below. FIG. 2 shows an optical digital microscope image in which a part of (unprocessed) mesh element 3 (knitted with a PP wire) before the fine shot blast processing is magnified 50 times.

  Further, FIG. 8 shows that in the present embodiment, a part of the mesh element 3 (a knitted nylon wire) having fine scratches (fine irregularities) formed in a satin pattern on the surface by fine shot blasting processing is increased by 50 times. 2 shows an enlarged optical digital microscope image. FIG. 6 shows an optical digital microscope image in which a part of (unprocessed) mesh element 3 (knitted with PP wire) before the fine shot blast processing is magnified 50 times.

  Further, FIG. 12 is a laser microscope photograph in which a part of a PP wire rod of a mesh element in which fine scratches (fine irregularities) are formed in a satin shape on the surface by fine shot blasting processing in this embodiment is further enlarged. I will show you. FIG. 13 shows a laser microscope photograph in which a part of the (untreated) PP wire before the fine shot blast processing is similarly enlarged.

  FIG. 17 is a laser microscope photograph of a part of a nylon wire rod of a mesh element having fine scratches (fine irregularities) formed on the surface thereof in a pear-skin shape by fine shot blasting in this embodiment. I will show you. FIG. 18 shows a laser microscope photograph in which a part of the (untreated) nylon wire before the fine shot blast treatment is similarly enlarged.

  From these, it can be confirmed that a large number of very fine projections or scratches (concave portions) are randomly formed (in a satin pattern) on the surface of the resin wire 1 of the mesh element 3 (the contact area with the granular material). .

In the present embodiment, the wire diameter of the PP wire is about φ90 μm, but the present invention is not limited to this, and it can be about φ50 μm to φ1000 μm.
Similarly, in the present embodiment, the wire diameter of the nylon wire is about φ240 μm, but the present invention is not limited to this, and it can be about φ50 μm to φ1000 μm.

  In the present embodiment, when a PP wire is used as the resin wire, a mesh size of # 18 to 20 (a predetermined gap (aperture) between the wires is about 900 μm) is taken as an example, but the present invention is not limited to this. The present invention is applicable regardless of the mesh size as long as clogging of the powdery substance and adhesion of dust can be suppressed.

  In the present embodiment, when a nylon wire is used as the resin wire, a mesh size of ♯70 (a predetermined gap (opening) between wires is approximately 200 μm) is taken as an example, but the present invention is not limited to this. The present invention is applicable regardless of the mesh size as long as clogging of the powdery substance and adhesion of dust can be suppressed.

In the present embodiment, the powdery substance is exemplified by powder (powder substance: powder) such as flour, potato starch, constarch, matcha powder, cocoa powder, powdered sugar, powdered medicine, and the like. Although it has been described that the present invention can be applied, the present invention is not limited to these, and can also be applied to the suppression of adhesion of dust and dirt.
That is, the object to be treated according to the present invention includes not only powdery substances and granular substances but also fine substances such as dust and dust whose shape is not specified.

  The cross-sectional shape (cross-sectional shape perpendicular to the longitudinal direction) of the resin wire is not limited to a general circular shape as a wire, but may be an ellipse, a polygon having more than a triangle, a petal, or the like. be able to.

  Further, the mesh element (net-like element) according to the present invention is not limited to the element used for sieving (classification), but may be used for other purposes (for example, a filter element for filtration such as a filter for an air conditioner). It is also applicable when it is done.

In addition, the present invention is not limited to a mesh element (mesh, screen, filter) formed by knitting a resin wire, and includes a group in which a plurality of resin wires are arranged in parallel at a predetermined interval. It is also applicable to a mesh element that forms a mesh by superimposing a plurality of groups arranged side by side at a predetermined interval at an intersecting angle, and the like. Form a fine scratch (fine unevenness) on the surface such as a mesh element that is formed by injecting a mold into a mold or the like and a mesh element in which many fine holes are opened in a resin plate-shaped element. In such a case, the present invention is applicable and included in the scope of the present invention.
That is, the mesh element according to the present invention is synonymous with a “net-like element” including a mesh, a lattice, a grid, and the like.

  Further, in the present embodiment, a case is described in which fine scratches (fine irregularities) are formed on the surface of the resin wire by mechanical fine shot blasting, but the present invention is not limited to this. Fine scratches (fine irregularities) can be formed by chemical etching or plasma processing.

The resin according to the present invention can be a thermoplastic resin.
Thermoplastic is a general term for a resin that softens when heated to an appropriate temperature and has plasticity, and solidifies when cooled.It is a term for a thermosetting resin. These include linear polymers such as polyethylene, polypropylene, polystyrene, polyvinyl chloride such as polyvinyl chloride, and condensation polymers such as polyester and polyamide. "(Brittanica International Encyclopedia, Britannica International reference).

Also, among thermoplastic resins, general-purpose plastics are relatively inexpensive and easy to process, so they are often used in industrial parts and daily necessities. For general-purpose plastics, for example, PE (polyethylene), PVC (polyvinyl chloride), PP (Polypropylene), PS (polystyrene), ABS (acrylonitrile butadiene styrene), AS (acrylonitrile styrene), PMMA (acrylic), PBT (polybutylene terephthalate), PET (polyethylene terephthalate), and the like.
Further, the thermoplastic resin according to the present invention may include engineered plastics, super engineering plastics, and the like, in addition to general-purpose plastics.

Further, the resin according to the present invention may be a polymer material (polymer material).
The polymer material has a molecular weight of more than 10,000 (based on the weight of atoms constituting the molecule = carbon 12).
As the polymer material, synthetic fibers, synthetic resins (plastics, fluorine resins such as “Teflon (registered trademark)” or the like), synthetic rubbers, and the like are assumed.

  The present invention is not limited to the above-described embodiments of the present invention, and various changes can be made without departing from the spirit of the present invention.

1 Resin wire 2 Predetermined gap (opening)
3 mesh elements (net-like elements)

Claims (8)

  A fine flaw is formed by fine shot blasting on a contact surface of a resin mesh element used for a portion in contact with a substance to be treated, and the arithmetic average roughness (Ra) of the contact surface is 0.3 to 1.2 μm. A method for treating a surface of a resin mesh element.   A fine flaw is formed by fine shot blasting on the contact surface of a resin wire used for a part in contact with the substance to be treated, and the arithmetic average roughness (Ra) of the contact surface is set to 0.3 to 1.2 μm. A surface treatment method for a resin wire rod.   A mesh element made of resin used for a portion that comes into contact with a substance to be treated, in which fine scratches are formed on the contact surface, and the arithmetic average roughness (Ra) of the contact surface is 0.3 to 1.2 μm. A resin mesh element, characterized in that:   The resin mesh element according to claim 3, wherein the resin mesh element includes a crossed resin wire.   The resin mesh element according to claim 4, wherein the resin wire is a polyethylene wire.   The resin mesh element according to claim 4, wherein the resin wire is a nylon wire.   The resin mesh element according to any one of claims 3 to 6, wherein the fine scratches are formed by a fine shot blasting process. A resin wire used for a part that comes into contact with a substance to be treated, wherein a fine flaw is formed on the contact surface, and the arithmetic average roughness (Ra) of the contact surface is 0.3 to 1.2 μm. A resin wire rod characterized by the following.