JP2021016846A - Support net for pleat filter compound - Google Patents

Abstract

To provide a support net for pleat filter compound which can improve water permeability of a pleat filter.SOLUTION: A support net for pleat filter compound, which is compounded into a filter for a pleat filter, comprises a support net body comprising a fabric. With respect to plural warps which are adjacent in a complete organization (1 repeat) unit of the support net body comprising the fabric, a proportion such that a pitch dimension becomes Px is 50% to 80%, a proportion such that the pitch dimension becomes m Px (m is a numeric value of 1.5 or more and 4 or less) is 20% to 50%.SELECTED DRAWING: Figure 2

Description

The present invention relates to a support net for a pleated filter composite.

Conventionally, a filter has been used for filtering particulate matter and the like from a filtering fluid such as air and water, and a pleated filter as shown in Patent Document 1 is known. In this pleated filter, for example, as shown in FIG. 11, a sheet-shaped filter member is folded into a form having a plurality of folds (folded) to form a tubular shape, and the pleated filter is housed in a tubular cage 101. used. In FIG. 11, the pleated filter 100 is arranged along the outer peripheral surface of the tubular intermediate core member 102.

Here, the pleated filter is generally formed by folding a filter member formed by compounding a support for pleating filter compounding with a porous filter element. This support is a sheet-like body having an opening larger than the hole of the filter element, in order to prevent the pleated filter (filter element) from losing its shape, and further to reduce water permeability due to contact between folds. It is provided to suppress.

As the support laminated on the filter element, for example, a long fiber non-woven fabric such as a spunbonded non-woven fabric, a resin sheet having a plurality of lattice-shaped openings, or the like is used.

Since such a pleated filter has a fold structure, the contact area with the filtering fluid flowing into the cage is increased even though it is compact, and excellent filtering performance can be exhibited.

Japanese Unexamined Patent Publication No. 2003-47809

As described above, the pleated filter has excellent filtration performance, but further improvement in filtration performance is desired. One approach is to improve the filter element itself for the purpose of improving water permeability in order to increase the utilization rate of the filter element, but if the water permeability is increased too much, the filtration performance will deteriorate, so this filter element There is a limit to the improvement of the pleated filter, and it is difficult to obtain a pleated filter that exhibits excellent water permeability.

The present invention has been made to solve such a problem, and pays attention to a support composited with a filter element, and can improve the water permeability of the pleated filter composite support net. The purpose is to provide (support).

The above object of the present invention is a support net for compounding a pleated filter to be composited with a filter for a pleated filter, the support net body made of a woven fabric is provided, and the complete structure of the support net body made of the woven fabric (1 For a plurality of adjacent warp yarns in the repeat) unit, the ratio of the pitch dimension to Px is 50% to 80%, and the ratio of the pitch dimension to m · Px (m is a value of 1.5 or more and 4 or less) is 20%. Achieved by a pleated filter composite support net characterized by ~ 50%.

Further, the above object of the present invention is a pleated filter composite support net that is composited with a filter for a pleated filter, and includes a support net main body made of a woven fabric, and a complete structure of the support net main body made of the woven fabric. For a plurality of adjacent wefts in the (1 repeat) unit, the ratio of the pitch dimension to Py is 50% to 80%, and the ratio of the pitch dimension to n · Py (n is a numerical value of 1.5 or more and 4 or less). It is achieved by a support net for pleated filter composites, characterized by being 20% to 50%.

Further, the above object of the present invention is a pleated filter composite support net that is composited with a filter for a pleated filter, and includes a support net main body made of a woven fabric, and a complete structure of the support net main body made of the woven fabric. For a plurality of adjacent warp threads in the (1 repeat) unit, the ratio of the pitch dimension to Px is 50% to 80%, and the ratio of the pitch dimension to m · Px (m is a numerical value of 1.5 or more and 4 or less). The ratio of the pitch dimension to Py is 50% to 80% and the pitch dimension is n · Py (n is a value of 1.5 or more and 4 or less) with respect to a plurality of adjacent wefts having a pitch dimension of 20% to 50%. This is achieved by a pleated filter composite support net characterized in that the proportion is 20% to 50%.

In this pleated filter composite support net, the ratio (Px / Dx) of the pitch dimension Px to the diameter Dx of the warp is in the numerical range of 4 to 11, and the pitch dimension Py and the diameter Dy of the weft are The ratio (Py / Dy) is preferably in the numerical range of 4 to 11.

Further, in the support net main body made of the woven fabric, with respect to the plurality of warp threads and the plurality of weft threads, the odd-numbered warp threads are configured to pass above the odd-numbered weft threads and below the even-numbered weft threads, and are even numbers. The second warp is preferably configured to pass below the odd-numbered weft and above the even-numbered weft.

Further, it is preferable that the average opening of the warp and the average opening of the weft in the complete structure (1 repeat) unit of the support net body made of the woven fabric is 0.12 mm or more and 0.9 mm or less.

The fiber diameters of the warp and weft are preferably 20 μm or more and 500 μm or less.

Further, the support net body can be configured as a woven fabric of thermoplastic fluororesin fibers.

According to the present invention, it is possible to provide a support net for a pleated filter composite that can improve the water permeability of the pleated filter.

It is a schematic block diagram which shows the support net for the pleated filter composite which concerns on this invention. It is an enlarged view of the main part of FIG. It is a schematic structural plan view which shows the woven fabric of the pitch dimension such as warp and weft. It is a schematic configuration plan view which shows an example of the support net for pleated filter compound which concerns on this invention. It is a schematic cross-sectional view of the support net for a pleated filter composite which concerns on this invention. It is an enlarged view of the main part of the support net for compounding a pleated filter seen from the arrow D direction of FIG. It is explanatory drawing for demonstrating the pleating part in a pleated filter. It is explanatory drawing for demonstrating the test apparatus subjected to the water flow test performed by the inventor of this invention. FIG. 5 is a schematic configuration plan view of the complete structure of a support net for a pleated filter composite made of a woven fabric according to an example subjected to a water flow test conducted by the inventor of the present invention. It is a graph which concerns on the water flow test result. It is explanatory drawing for demonstrating the pleated filter.

Hereinafter, the pleated filter composite support net according to the present invention will be described with reference to the accompanying drawings. The drawings are partially enlarged or reduced to facilitate understanding of the configuration. The pleated filter composite support net 1 according to the present invention is used by being composited with a porous filter element, prevents the filter element from losing its shape, and further folds and contacts. It is provided to suppress a decrease in water permeability between folds.

Here, the type of the filter element to which the pleated filter composite support net 1 is composited is not particularly limited, but for example, a depth filter or a membrane filter can be preferably used. The depth filter is a type of filter that internally captures foreign matter (particles), and the membrane filter is a type of precision filtration filter that catches foreign matter (particles) on the surface of a porous membrane.

The pleated filter composite support net 1 according to the present invention includes a sheet-shaped support net main body 2 as shown in the schematic configuration plan view of FIG. Such a pleated filter composite support net 1 is laminated on a sheet-shaped filter element and then partially heat-bonded to form a composite to form a filter member, and then the figure described in the background art. As shown in 11, it is folded into a form having a plurality of folds (folded) to form a tubular form, and is housed in a tubular shape cage for use. The pleated filter composite support net 1 may be configured to be laminated only on one side of the filter element, or the filter element may be sandwiched between two pleated filter composite support nets 1 (filter). (Pleated filter composite support net 1 may be laminated on both sides of the element).

As shown in FIG. 1, the sheet-shaped support net main body 2 is configured as a woven fabric composed of a plurality of warp threads 3 and a plurality of weft threads 4, and a predetermined interval is provided between adjacent warp threads 3. In addition, a predetermined interval is provided between the adjacent weft threads 4. With such a configuration, the support net main body 2 is configured to include a plurality of rectangular void portions (lattice-shaped openings 5) surrounded by the warp threads 3 and the weft threads 4.

In particular, in the present invention, as shown in FIG. 2, which is an enlarged view of a main part of FIG. 1, the pitch dimensions of the plurality of warp threads 3 adjacent to each other in the complete structure (1 repeat) unit of the support net main body 2 made of woven fabric are different. The ratio of Px is 50% to 80%, and the ratio of pitch dimensions of m · Px (m is a value of 1.5 or more and 4 or less) is 20% to 50%. Further, with respect to the plurality of weft threads 4 adjacent to each other in the complete structure (1 repeat) unit of the support net main body 2 made of woven fabric, the ratio of the pitch dimension to Py is 50% to 80%, and the pitch dimension is n · Py (n is n · Py). It is configured so that the ratio of (a numerical value of 1.5 or more and 4 or less) is 20% to 50%.

The complete structure (1 repeat) unit of the support net main body 2 made of a woven fabric is the smallest repeating unit of the woven fabric structure, and the complete structure is connected vertically and horizontally to form a woven fabric. In the present invention, in FIG. 1, the region A surrounded by the alternate long and short dash line is a complete tissue (1 repeat) unit, and FIG. 2 shows this complete tissue (1 repeat) unit.

In such a support net main body 2, for example, in a weaving device for forming a woven fabric having the same pitch dimension of the warp 3 and the pitch dimension of the weft 4 as shown in FIG. 3, the warp 3 and the weft 4 at predetermined positions are set. It can be formed by weaving without weaving. The support net main body 2 shown in FIG. 1 has warp numbers 3, 7, 11 and warp threads 3 and weft threads 4 at positions corresponding to warp thread numbers 3, 7, 11 in the woven fabric having a pitch dimension such as warp and weft shown in FIG. Can be formed by weaving without setting in a weaving device. It should be noted that the woven fabric having pitch dimensions such as warp and weft may be woven once and then formed by pulling out the warp 3 and the weft 4 at a predetermined position.

Here, if the support net main body 2 as a woven fabric is formed without simply setting the warp threads 3 and the weft threads 4 at predetermined positions in the weaving device, the reference numerals: B1, B2, C1, and C2 are displayed in FIG. As shown in the above, adjacent warp threads 3 (or adjacent weft threads 4) are not arranged on the upper side and the lower side of one weft thread 4, respectively, and both warp threads 3 (or both weft threads 4) are one weft thread. It may be arranged on the upper side (or lower side) of 4. The support net body 2 in which the adjacent warp threads 3 (or the adjacent weft threads 4) have such an arrangement relationship may have a reduced strength. Therefore, as shown in FIG. 1, a support net made of a woven fabric is preferable. In the main body 2, with respect to the plurality of warp threads 3 and the plurality of weft threads 4, the odd-numbered warp threads 3 are preferably configured to pass above the odd-numbered weft threads 4 and below the even-numbered weft threads 4. Further, it is preferable that the even-numbered warp threads 3 pass under the odd-numbered weft threads 4 and above the even-numbered weft threads 4.

Further, in the configurations shown in FIGS. 1 and 2, "m" in the pitch dimension m · Px of the warp thread 3 is 2, and “n” in the pitch dimension of the weft thread 4: n · Py is also 2. The ratio of the pitch dimension to Px is 2/3 (66.7%), and the ratio of the pitch dimension to m · Px is 1/3 (33.3%). Similarly, the ratio of the pitch dimension to Py is 2/3 (66.7%), and the ratio of the pitch dimension to n · Py is 1/3 (33.3%).

Regarding "m" in the pitch dimension m · Px of the warp 3, if it is smaller than 1.5, it becomes difficult to exhibit good water permeability, and if it is more than 4, the filter element It becomes difficult to exert the function as a support net to prevent the shape from getting out of shape. The same applies to "n" in the pitch dimensions n · Py of the weft 4.

Further, the pitch dimension of the warp 3 described above: Px is preferably configured to be in a numerical range of 0.15 mm or more and 1.05 mm or less, and preferably in a range of 0.15 mm or more and 0.65 mm or less. It is more preferable to configure. Further, it is more preferable to configure the value so that the numerical range is 0.15 mm or more and 0.45 mm or less. The same applies to the pitch dimension of the weft 4: Py.

Further, the number of meshes of the support net main body 2 configured as a woven fabric is preferably configured to be in the range of 20 or more and 200 or less, and more preferably in the range of 25 or more and 150 or less. The number of meshes means the number of meshes between the vertical line and the horizontal line of 25.4 mm (1 inch).

The diameters (fiber diameters) of the warp threads 3 and the weft threads 4 are preferably in the range of 20 μm or more and 500 μm or less, and more preferably in the range of 30 μm or more and 300 μm or less. .. Further, it is more preferable to use one having a range of 35 μm or more and 250 μm or less.

Further, the numerical value of Px / Dx, which is the ratio of the pitch dimension of the warp 3 to the diameter (fiber diameter) of the warp 3: Dx, is set to be in the numerical range of 4 or more and 11 or less. It is preferable, and it is more preferable to configure it so that it has a numerical range of 4 or more and 7.5. Similarly, the value of Py / Dy, which is the ratio of the pitch dimension of the weft 4 to Py and the diameter (fiber diameter) of the weft 4 to Dy, may be configured to be in the numerical range of 4 or more and 11 or less. Preferably, it is more preferably configured so as to have a numerical range of 4 or more and 7.5.

Further, the average opening of the warp threads 3 in the support net main body 2 made of woven fabric is preferably configured to be in a numerical range of 0.12 or more and 0.9 or less, and is a numerical value of 0.13 or more and 0.87 or less. It is more preferable to configure it so as to be in the range. Further, it is more preferable to configure the value so that the numerical range is 0.14 or more and 0.85 or less. The same applies to the average opening of the weft 4.

Further, various materials can be used for the warp threads 3 and the weft threads 4 that form the support net main body 2 made of a woven fabric, and for example, it is preferable to use a thermoplastic fluororesin fiber. By constructing the support net main body 2 with such a material, the durability can be improved, and the two can be easily integrated by heat-adhering to the filter element. Examples of the thermoplastic fluororesin fiber include a tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA, melting point 300 to 310 ° C.) and a tetrafluoroethylene-hexafluoropropylene copolymer (FEP, melting point 250 to 280 ° C.). ℃), ethylene-tetrafluoroethylene copolymer (ETFE, melting point 260-270 ℃), polyvinylidene fluoride (PVDF, melting point 160-180 ℃), polychlorotrifluoroethylene (PCTFE, melting point 210 ℃), tetrafluoroethylene -Hexafluoropropylene-perfluoroalkyl vinyl ether copolymer (EPE, melting point 290 to 300 ° C.) or the like can be used.

When a pleated filter is formed by using the pleated filter composite support net 1 according to the present invention as a support member for a filter element, the pleated filter exhibits extremely good water flow performance and further high filtration performance. can do.

Specifically, the pleated filter composite support net 1 according to the present invention has a pitch dimension with respect to a plurality of warp threads 3 adjacent to each other in a complete structure (1 repeat) unit of the support net main body 2 made of a woven fabric, as described above. The ratio of Px is 50% to 80%, and the ratio of pitch dimensions of m · Px (m is a value of 1.5 or more and 4 or less) is 20% to 50%. For a plurality of weft threads 4 adjacent to each other in the complete structure (1 repeat) unit of the support net main body 2 made of woven fabric, the ratio of the pitch dimension to Py is 50% to 80%, and the pitch dimension is n · Py (n is 1). It is configured so that the ratio of .5 or more and 4 or less) is 20% to 50%. The pleated filter composite support net 1 having such a configuration is, for example, a support net formed as a woven fabric having warp / weft equal pitch dimensions as shown in FIG. 3 (warp three pitch dimensions: Px, weft in all regions). The number of warp threads 3 and weft threads 4 that hinder the water flow performance is smaller than that of the support net (support net formed as a 4-pitch dimension Py), and the surface of the filter member is formed with reference to the schematic cross-sectional view of FIG. It is possible to increase the amount of water flowing through in the direction perpendicular to the direction. As a result, it is possible to achieve a high flow rate of the pleated filter, and the filtration performance is improved.

Further, since the pleated filter composite support net 1 according to the present invention is provided with lattice-shaped openings 5 of various sizes, it flows in the direction perpendicular to the paper surface of FIGS. 1 and 2 and passes through the inside of the filter element. The flow of the filtered fluid (in FIG. 5, the flow of the filtered fluid in the direction of the arrow) is more than that of the support net (support net having the configuration shown in FIG. 3) formed as a woven fabric having pitch dimensions such as warp and weft. It becomes complicated, and it becomes possible to improve the distribution performance of the filtered fluid in the plane direction of the filter element, and as a result, it becomes possible to improve the filtering performance of the pleated filter.

Further, since the pleated filter composite support net 1 is formed as a woven fabric, as shown in FIG. 5, there is a portion where the weft threads 4 are alternately arranged in the upper and lower parts with respect to the warp threads 3 (one thread). There is also a portion where the warp threads 3 are arranged alternately in the upper and lower directions with respect to the weft threads 4 of the above. Due to such structural features, as shown in FIG. 6 as viewed from the direction of arrow D in FIG. 5, a part of the filtered fluid guided into one lattice-shaped opening 5 is a boundary of the opening 5. It is possible to move over the warp threads 3 and the weft threads 4 that form the warp threads 3 and into the adjacent opening 5, which makes it possible to further improve the distribution performance of the filtered fluid in the plane direction of the filter element. It is possible to improve the filtration performance of the pleated filter.

In particular, in the present invention, the value of Px / Dx, which is the ratio of the pitch dimension of the warp 3 to Px and the fiber diameter of the warp 3: Dx, is configured to be in the numerical range of 4 or more and 11 or less. The value of Py / Dy, which is the ratio of the pitch dimension of the weft 4 to Py and the fiber diameter of the weft 4 to Dy, is set to be in the numerical range of 4 or more and 11 or less. By providing such a configuration, a part of the filtered fluid guided into one lattice-shaped opening 5 can easily move over the warp 3 and the weft 4 into the adjacent opening 5, and the filter. The distribution performance of the filtered fluid in the plane direction of the element can be improved.

Further, in the present invention, since the pleated filter composite support net 1 is formed by using the fiber diameters of the warp threads 3 and the weft threads 4 in the range of 20 μm or more and 500 μm or less, the warp threads 3 and the weft threads 4 are used. It becomes easy to form a gap at the intersection (a gap based on a step portion formed in the region indicated by reference numeral E in FIG. 5). As a result, a part of the filtering fluid guided into the one lattice-shaped opening 5 easily moves over the warp threads 3 and the weft threads 4 into the adjacent opening 5, and is filtered in the plane direction of the filter element. The fluid distribution performance can be improved.

Further, the pleated filter composite support net 1 according to the present invention is particularly effective when it is composited with a membrane filter to form a pleated filter. Membrane filters are microfiltration filters of the type that capture foreign substances (particles) on the surface of a porous membrane as described above, and because they have a very small pore size, their water flow performance is generally lower than that of depth filters. Water flow performance is easily affected by the support net, which is a support member. The pleated filter composite support net 1 according to the present invention has the above-mentioned structural features and has the effect of increasing the flow rate of the filtered fluid passing through the filter element, and therefore has general water flow performance. This effect greatly acts on the pleated filter compounded with the membrane filter, which is considered to be relatively low, and the water flow performance can be significantly improved.

Next, since the inventor of the present invention conducted a confirmation test for confirming the effect of the pleated filter composite support net 1 according to the present invention, the test contents and test results will be described below.

In the pleated filter, with reference to FIG. 7, the water flow performance at the portion where the pleated filter composite support nets 1 overlap each other is the lowest, so a model test of this portion was performed. Specifically, as shown in FIG. 8, two pleated filter composite support nets 1 according to the present invention are laminated to form a laminated body of the pleated filter composite support net 1, and silicon is formed on the upper surface side of the laminated body. The sheet 10 and the iron plate 11 are laminated in this order, and similarly, a structure in which the silicon sheet 10 and the iron plate 11 are laminated in this order is also formed on the lower surface side of the laminated body, and the two pleated filter composite support nets 1 Water was passed through the laminate from the left side to the right side in the figure, and the amount of water discharged from the right side of the two pleated filter composite support net 1 laminates was measured. When the amount of water to be discharged is small, it can be determined that the water flow resistance at the portion where the pleated filter composite support nets 1 overlap each other is large, and when the amount of water to be discharged is large, the support for the pleated filter composite is supported. It can be determined that the water flow resistance at the portion where the nets 1 overlap each other is small. The water flow test was conducted by setting the water pressure on the left side (water inflow portion) of the pleated filter composite support net 1 laminate to be 0.5 kPa. Further, each of the pleated filter composite support nets 1 to be laminated is configured as a rectangular shape having a length × width = 21 cm × 10 cm. Further, the silicon sheet 10 and the iron plate 11 are configured as a rectangular shape having a length × width = 30 cm × 21 cm. The thickness of the silicon rubber sheet 10 is 0.3 cm, and the thickness of the iron plate 11 is 2 cm.

Further, Examples 1 to 8 and Comparative Examples 1 to 11 shown in Tables 1 and 2 below were prepared as the pleated filter composite support net 1 to be used in the water flow test. Here, the number of meshes in the table means the number of meshes between the vertical line and the horizontal line of 25.4 mm (1 inch). Further, the number of meshes in Examples 1 to 8 does not mean the actual number of meshes, but all the warp threads 3 and the weft threads 4 are formed with the warp thread 3 pitch: Px and the weft thread 4 pitch: Py, as described above. The number of meshes when the ratio of warp 3 pitch: m · Px and weft 4 pitch: n · Py is assumed to be 0 is described.

Further, in Examples 1 to 8, for a woven fabric formed with warp 3 pitch: Px and weft 4 pitch: Py for all warp 3 and weft 4 using the warp 3 and weft 4 shown in Tables 1 and 2. , The warp 3 and the weft 4 at a predetermined position are formed by weaving without being set in the weaving device, and the shape of the weaving structure in the woven fabric is as follows: warp 3 pitch: Px, weft for all the warp 3 and the weft 4. 4 pitch: For the woven fabric formed by Py, of the adjacent a warp threads 3, b warp threads 3 are not provided (thread removal), and d of the adjacent c weft threads 4 are not provided. The shape in which the weft 4 is not provided (thread is removed) is grasped as being formed as a repeating pattern (complete structure unit: 1 repeat unit).

Specifically, in Examples 1 to 4 and 6, as shown in FIG. 2, of the adjacent warp threads 3: 4, one warp thread 3 is not provided (thread removal), and the warp threads 3 are adjacent to each other. Weft 4: Of the four, it is formed as a woven fabric having a complete structure in which one weft 4 is not provided (threads are removed). Further, in the fifth embodiment, as shown in FIG. 9A, one of the three adjacent warp threads 3: 3 is not provided (thread removal), and the adjacent weft threads are 4: 3. Of the books, one weft 4 is not provided (threads are pulled out) and is formed as a woven fabric having a complete structure, and Example 7 has adjacent warp threads 3: 7 as shown in FIG. 9 (b). Formed as a woven fabric having a complete structure in which two warp threads 3 are not provided (thread removal) in the book and two weft threads 4 are not provided (thread removal) among adjacent weft threads 4: 7. Has been done. Further, in the eighth embodiment, as shown in FIG. 9 (c), three warp threads 3 are not provided (thread removal) among the adjacent warp threads 3: 8, and the adjacent weft threads are 4: 8. Of the books, it is formed as a woven fabric having a complete structure in which three weft threads 4 are not provided (threads are removed). In addition, in FIGS. 9A, 9B, and 9C, the part shown by the dotted line shows the position of the warp thread 3 and the weft thread 4 from which the thread is pulled out.

Here, in the complete structure unit of the woven fabric, the ratio of the pitch dimension of the warp 3 to m · Px is 33.3% in Examples 1 to 4 and 6, and 50% in Example 5 and Example. 7 is 20%, and Example 8 is 20%. The value of "m" in the pitch dimension of the warp 3: m · Px is "2" in Examples 1 to 6, "3" in Example 7, and "4" in Example 8. Become. Similarly, in the complete structure unit of the woven fabric, the ratio of the pitch dimension of the weft 4 to n · Py is 33.3% in Examples 1 to 4 and 6, and 50% in Example 5 and Example. 7 is 20%, and Example 8 is 20%. The value of "n" in the pitch dimension of the weft 4: n · Py is “2” in Examples 1 to 6, “3” in Example 7, and “4” in Example 8. Become.

In Comparative Examples 1 to 11, all the warp 3 and the weft 4 are formed as a woven fabric formed by the warp 3 pitch: Px and the weft 4 pitch: Py shown in Table 1.

Further, the average opening value of the warp threads 3 in Table 1 is calculated by the following formula 1.
[Formula 1]: {(warp pitch: Px) x (above a)-(warp fiber diameter: Dx) x (above a-above b) / 1000} / (above a)
The average opening value of the weft 4 in Table 1 is calculated by the following formula 2.
[Equation 2]: {(Weft pitch: Py) x (c above)-(Weft fiber diameter: Dy) x (c above-d d above) / 1000} / (c above)
Regarding Comparative Examples 1 to 11, the concept is that b warp threads 3 are not provided among a adjacent warp threads 3 (d d weft threads 4 are not provided among c adjacent weft threads 4). Therefore, the value of the average opening of the warp 3 is calculated by setting a to 2 and b to 0 in the above equation 1. Similarly, the average opening value of the warp 3 is calculated by setting c in Equation 2 to 2 and b to 0.

The average aperture ratio (%) in Table 1 is calculated by the following formula 3.
[Formula 3]: [(Average opening of warp threads) / {Average opening of warp threads + (a line above-b line above) / (a line above) x (warp fiber diameter: Dx) / 1000} ] × [(Average opening of wefts) / {Average opening of wefts + (c above-d d above) / (c above) × (Weft fiber diameter: Dy) / 1000}] × 100
Regarding Comparative Examples 1 to 11, the concept is that b warp threads 3 are not provided in the adjacent a warp threads 3 (d d weft threads 4 are not provided in the adjacent c weft threads 4). Therefore, a in the above equation 3 is set to 2, b is set to 0, c is set to 2, and b is set to 0, and the value of the average aperture ratio (%) is calculated.

The results of the water flow test (water flow amount) for Examples 1 to 8 and Comparative Examples 1 to 11 are shown in Table 3 below. In Table 3, the average opening shown in Table 1 is also described. Further, with respect to Examples 1 to 8 and Comparative Examples 1 to 11, a graph showing the relationship between the average opening of the warp threads 3 and the amount of water flow is shown in FIG. In the graph of FIG. 10, the value of the average opening of the warp threads 3 is shown on the horizontal axis, and the value of the water flow rate is shown on the vertical axis. Further, in FIG. 10, the data according to Examples 1 to 8 are indicated by ●, and the data according to Comparative Examples 1 to 11 are indicated by ▲. Further, in FIG. 10, the approximate expression of the data according to Examples 1 to 8 and the approximate expression of the data according to Comparative Examples 1 to 11 are also described. In addition, in each of Examples 1 to 8, since the average opening of the warp 3 and the average opening of the weft 4 are configured to have the same value, the overall average opening in the complete structure of the woven fabric. The opening also has the same value as the average opening value of the warp threads 3 shown in Tables 1 and 3.

From Table 3 and FIG. 10, the pleated filter composite support net 1 of the present invention according to Examples 1 to 8 has the same average as compared with Comparative Examples 1 to 11 formed as a woven fabric having pitch dimensions such as warp and weft. Looking at the value of the opening, it can be seen that the amount of water flow has increased significantly. Specifically, for example, when the opening value is 0.6, in the case of the pleated filter composite support net 1 according to the comparative example, the water flow rate is about 70 ml / min, whereas the present invention relates to the present invention. In the case of the pleated filter composite support net 1, it is considered that a water flow rate of about 100 ml / min can be obtained, and the pleated filter composite support net 1 according to the present invention has a low water flow resistance and is extremely good. It can be seen that it exhibits water flow characteristics.

The pleated filter composite support net 1 according to the present invention has been described above, but the specific configuration thereof is not limited to the above embodiment. In the above embodiment, with respect to a plurality of warp threads 3 adjacent to each other in the complete structure (1 repeat) unit of the support net main body 2, the ratio of the pitch dimension to Px is 50% to 80%, and the pitch dimension is m · Px (m is). , 1.5 or more and 4 or less) is configured to be 20% to 50%, and further, the ratio of pitch dimensions to Py is 50% to 80% for a plurality of adjacent weft threads 4. , Py (n is a numerical value of 1.5 or more and 4 or less) is configured to be 20% to 50%, but for example, only for a plurality of adjacent warp threads 3. The ratio of the pitch dimension to Px is 50% to 80%, and the ratio of the pitch dimension to m · Px (m is a value of 1.5 or more and 4 or less) is 20% to 50%. Regarding the pitch, it may be configured so that the pitch dimension is Py in the entire region (the pitch dimension is evenly spaced) (in other words, it may be configured so that n = 0). Similarly, only for a plurality of adjacent weft threads 4, the ratio of the pitch dimension to Py is 50% to 80%, and the ratio of the pitch dimension to n · Py (n is a value of 1.5 or more and 4 or less). May be configured to be 20% to 50%, and the warp pitch may be configured to have a pitch dimension; Px (in other words, an evenly spaced pitch dimension) in the entire region (in other words, n). It may be configured so that = 0).

Even when the pleated filter composite support net 1 (support net main body 2) is formed as such a configuration, the same effect as the above-mentioned effect of improving water permeability can be obtained.

Further, in the above-mentioned water flow test, in any of Examples 1 to 8, the value of “m” in the pitch dimension of the warp 3: m · Px and the pitch dimension of the weft 4: “n” in n · Py. The pleated filter composite support net 1 (support net) configured as a woven fabric by making the value of "m" and the value of "n" different from each other so as to have the same value as the value of. Needless to say, the main body 2) may be formed.

1 Support net for pleated filter compound 2 Support net body 3 Warp 4 Weft 5 Opening

Claims (8)

It is a support net for pleated filter compounding that is compounded with a filter for pleated filter.
Equipped with a support net body made of woven fabric,
With respect to a plurality of warp yarns adjacent to each other in the complete structure (1 repeat) unit of the support net body made of the woven fabric, the ratio of the pitch dimension to Px is 50% to 80%, and the pitch dimension is m · Px (m is 1.5). A support net for compounding a pleated filter, characterized in that the ratio of (a numerical value of 4 or less) is 20% to 50%. It is a support net for pleated filter compounding that is compounded with a filter for pleated filter.
Equipped with a support net body made of woven fabric,
With respect to a plurality of adjacent wefts in the complete structure (1 repeat) unit of the support net body made of the woven fabric, the ratio of the pitch dimension to Py is 50% to 80%, and the pitch dimension is n · Py (n is 1.5). A support net for a pleated filter composite, characterized in that the ratio of (a numerical value of 4 or less) is 20% to 50%. It is a support net for pleated filter compounding that is compounded with a filter for pleated filter.
Equipped with a support net body made of woven fabric,
With respect to a plurality of warp threads adjacent to each other in the complete structure (1 repeat) unit of the support net body made of the woven fabric, the ratio of the pitch dimension to Px is 50% to 80%, and the pitch dimension is m · Px (m is 1.5). The ratio of 4 or less is 20% to 50%, the pitch dimension is Py of 50% to 80%, and the pitch dimension is n · Py (n is n) for a plurality of adjacent wefts. , 1.5 or more and 4 or less), which is a support net for a pleated filter composite, characterized in that the ratio is 20% to 50%. The ratio (Px / Dx) of the pitch dimension Px to the diameter Dx of the warp is in the numerical range of 4 to 11, and the ratio of the pitch dimension Py to the diameter Dy of the weft (Py / Dy) is 4. The support net for compounding a pleated filter according to claim 3, which has a numerical range of ~ 11. In the support net main body made of the woven fabric, with respect to the plurality of warp threads and the plurality of weft threads, the odd-numbered warp threads are configured to pass above the odd-numbered weft threads and below the even-numbered weft threads, and are even-numbered. The pleated filter composite support net according to any one of claims 1 to 4, wherein the warp is configured to pass under the odd-numbered weft and above the even-numbered weft. The invention according to any one of claims 1 to 5, wherein the average opening of the warp and the average opening of the weft in the complete structure (1 repeat) unit of the support net body made of the woven fabric is 0.12 mm or more and 0.9 mm or less. Support net for pleated filter compound. The pleated filter composite support net according to any one of claims 1 to 6, wherein the warp and the weft have fiber diameters of 20 μm or more and 500 μm or less. The support net for a pleated filter composite according to any one of claims 1 to 7, wherein the support net main body is a woven fabric of a thermoplastic fluororesin fiber.

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