CN111676565B - Extension-resistant tensile high-performance industrial filter cloth and preparation method thereof - Google Patents

Abstract

The application aims to provide an anti-extension anti-stretching high-performance industrial filter cloth and a preparation method thereof. The warp yarns are respectively interwoven with the surface weft yarns, the middle weft yarns and the inner weft yarns according to a set weaving rule to form a filter cloth surface layer, a filter cloth middle layer and a filter cloth inner layer. The warp yarns shuttle back and forth among the filter cloth surface layer, the filter cloth middle layer and the filter cloth inner layer, and are mutually crossed and exchanged at the joint of the filter cloth middle layer and the filter cloth surface layer and the joint of the filter cloth inner layer, and are crossed and exchanged at the interval of the filter cloth middle layer, so that the space between the filter cloth surface layer and the filter cloth inner layer is divided into a plurality of tubular channels for inserting the filtering parts; wherein each warp yarn is shuttled according to the respective initial position in the order of the surface layer, the middle layer, the inner layer and the middle layer as a cycle. Compared with the prior art, the filter cloth provided by the application is simple in structure, and can better avoid the influence on the stretch-proofing performance and the anti-stretching performance due to the weak link in the local area.

Description

Extension-resistant tensile high-performance industrial filter cloth and preparation method thereof

Technical Field

The invention relates to a filter cloth, in particular to an anti-extension anti-stretching high-performance industrial filter cloth and a preparation method thereof.

Background

The industrial filter cloth is a filter medium woven by natural fibers and synthetic fibers and is mainly used for solid-liquid separation, industrial dust removal, smoke filtration and the like.

Currently, in the practical use process of industrial filter cloth, in some application fields, such as special filter equipment, for example, a filter press, filtrate is filtered in an extrusion manner, so that the pressure and tension applied to the industrial filter cloth during the working process of the special filter equipment are relatively large, and therefore the industrial filter cloth is required to have relatively high tensile strength and relatively high elasticity so as to have relatively high tensile resistance and tensile elongation resistance.

However, in the existing industrial filter cloth, yarns made of fibers with stretch resistance and stretch resistance are mostly adopted to weave a single-layer structure or a multi-layer composite structure, however, in the actual process, because the single-layer structure has poor filtering effect, and a local area is very easy to cause long-term use due to weak links, if a multi-layer structure is adopted, the integral stretch resistance and stretch resistance are affected due to the weak links which are easily caused by loose connection between layers.

In addition, in general, in order to improve the tensile resistance and the extension resistance of the industrial filter cloth, the warp and weft yarn density is dense, the fabric coverage coefficient is large, but the filter holes are small, so that the filtering effect is influenced.

Disclosure of Invention

The invention aims to provide the extension-resistant high-performance industrial filter cloth and the preparation method thereof, the structure is simple, and the problem that the extension-resistant performance and the extension-resistant performance are influenced by weak links in local areas can be better avoided.

In order to solve the technical problem, the invention provides an extension-resistant tensile high-performance industrial filter cloth, which comprises:

surface weft yarns for forming the surface layer of the filter cloth;

an inner weft for forming an inner layer of the filter cloth;

n groups of weft yarns for forming the middle layer of the filter cloth, wherein N is a positive integer;

warp yarns are interwoven with the surface weft yarns, the middle weft yarns and the inner weft yarns respectively according to a set weaving rule to form the surface layer of the filter cloth, the middle layer of the filter cloth and the inner layer of the filter cloth;

the warps shuttle back and forth among the filter cloth surface layer, the filter cloth middle layer and the filter cloth inner layer, and are mutually crossed and interchanged at the connection part of the filter cloth middle layer and the filter cloth surface layer and the connection part of the filter cloth inner layer, and are mutually crossed and interchanged at the interval part of the filter cloth middle layer, so that the space between the filter cloth surface layer and the filter cloth inner layer is divided into a plurality of tubular channels for inserting filtering parts; wherein each warp yarn is shuttled according to the respective initial position in the order of the surface layer, the middle layer, the inner layer and the middle layer as a cycle.

Further preferably, at least some of the warp yarns and the weft yarns are first yarns for resisting extension and second yarns for resisting stretching respectively; wherein the first yarns have an initial modulus that is less than the initial modulus of the second yarns; the elongation at break of the first yarn is greater than the elongation at break of the second yarn; wherein the first yarn has a rebound of greater than 85% at 3% proof stress; the second yarn has an initial modulus greater than 6N/tex; the second yarn has a breaking strength greater than 0.5N/tex.

Further preferably, the first yarn comprises any one or combination of polybutylene terephthalate fiber (PBT), 1, 3-propylene terephthalate fiber (PTT), polyurethane fiber (PU) and polyethylene terephthalate fiber (PET); the second yarn comprises: any one or combination of Carbon Fiber (CF), polyethylene terephthalate fiber (PET), poly (p-phenylene terephthalamide) fiber (PPTA), ultra-high molecular weight polyethylene fiber (UHMWPE) and polyamide fiber (PA).

Further preferably, the first yarn and the second yarn further comprise: any one or a combination of polyphenylene sulfide fiber (PPS), polytetrafluoroethylene fiber (PTFE), polyphenylene sulfide fiber (PPS) and polyether ether ketone (PEEK).

Further preferably, the covering coefficients of the surface layer of the filter cloth, the inner layer of the filter cloth and the middle layer of the filter cloth are 1600-2700; at least one of the warp yarns and the weft yarns comprises: a fiber yarn composed of a plurality of profile fibers; the cross section of the profiled fiber is in any one or combination of a triangle, a Y-shaped, a pentagon, a trilobal, a quadralobal, a pentalobal and a fan shape.

Further preferably, the method further comprises the following steps: a connecting member for connecting adjacent two filter elements; wherein, the connecting piece includes: the filter comprises a first lantern ring sleeved on one filter component, a second lantern ring sleeved on an adjacent filter component, and a connecting shaft for connecting the first lantern ring and the second lantern ring; the first lantern ring and the second lantern ring are both provided with through holes for sleeving filtering components and flexible components which are annularly arranged in the through holes and are used for being in close contact with the filtering components; and the size of the through hole is gradually increased from the outer side to the inner side where the filter component is sleeved.

Further preferably, the connecting member further includes: and the two opposite ends of the tension spring are respectively connected with the first sleeve ring or the second sleeve ring and can be sleeved on the filter part.

Further preferably, the pore diameter of the filtration pores in the filtration cloth is 80% or more of 5um or less; the air permeability of the stretch-proof high-performance industrial filter cloth is 10-30 mm/s under the pressure of 125 Pa.

Further preferably, the width of the tubular channel is 1-10 cm; and the materials of the filtering components arranged in the tubular channels in the two adjacent layers are different.

The application also provides a preparation method for preparing the stretch-proof high-performance industrial filter cloth.

Compared with the prior art, the application also has the following beneficial effects:

the anti-stretching high-performance industrial filter cloth has the advantages that the structure is simple, and the phenomenon that the anti-stretching performance and the anti-stretching performance are influenced due to the fact that weak links appear in local areas can be well avoided.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:

FIG. 1: the three-dimensional structure of the anti-stretching high-performance industrial filter cloth in the first embodiment of the invention is shown in the figure;

FIG. 2: a schematic cross-sectional view of one cycle of a stretch-resistant, high performance industrial filter cloth according to a first embodiment of the invention;

FIG. 3: the schematic use state diagram of the anti-extension tensile-resistant high-performance industrial filter cloth in the first embodiment of the invention;

FIG. 4: a schematic use state diagram of the anti-extension tensile-resistant high-performance industrial filter cloth in the third embodiment of the invention;

FIG. 5: a structural schematic diagram of an anti-stretching high-performance industrial filter cloth in a fourth embodiment of the invention;

FIG. 6: the structure of the connecting piece is schematically shown when the connecting piece is connected with each filtering component in the fourth embodiment of the invention;

FIG. 7: a schematic structural diagram of a fourth embodiment of the present invention when two adjacent connecting members are connected to each other;

FIG. 8: a specific structure diagram of a connecting piece in a fourth embodiment of the invention;

FIG. 9: a side view of a connector in a fourth embodiment of the invention;

reference numerals: the industrial filter cloth comprises an industrial filter cloth 1, a filter cloth surface layer 11, a surface layer weft yarn 111, a middle layer weft yarn 121, an inner layer weft yarn 131, a filter cloth middle layer 12, a filter cloth inner layer 13, a tubular passage 14, a filter part 15, a first lantern ring 16, a magnetic ring 164, a flexible part 165, a through hole 166, a connecting part 17, a connecting shaft 171, a clamping groove 172, a head 173, a rotating shaft 174, a tension spring 18, a second lantern ring 19, warp yarns 21, warp yarns 22 and warp yarns 23.

Detailed Description

The concept of the invention will be illustrated below by way of example with reference to specific examples of an industrial filter cloth with high performance, which is resistant to stretching and is resistant to stretching for sewage treatment or drinking water filtration treatment.

Implementation mode one

As shown in fig. 1 to 3, a first embodiment of the present invention provides an extension-resistant, stretch-resistant, high-performance industrial filter cloth, such as an industrial filter cloth 1, which is mainly composed of warp yarns, surface layer weft yarns for forming a surface layer 11 of the filter cloth, inner layer weft yarns for forming an inner layer 13 of the filter cloth, and a plurality of sets of weft yarns for forming an intermediate layer 12 of the filter cloth.

The warp yarns (refer to the warp yarns 21, 22 and 23 in fig. 2) are interwoven with the surface layer weft yarns, the middle layer weft yarns and the inner layer weft yarns (refer to the surface layer weft yarns 111, the middle layer weft yarns 121 and the inner layer weft yarns 131 in fig. 2) according to a set weaving rule to form the filter cloth surface layer 11, the filter cloth middle layer 12 and the filter cloth inner layer 13.

The warp yarns shuttle back and forth among the filter cloth surface layer 11, the filter cloth middle layer 12 and the filter cloth inner layer 13, and are mutually crossed and interchanged at the joint of the filter cloth middle layer 12 and the filter cloth surface layer 11 and the joint of the filter cloth inner layer 13, and are crossed and interchanged at the interval of the filter cloth middle layer 12, so that the space between the filter cloth surface layer 11 and the filter cloth inner layer 13 is divided into a plurality of tubular channels 14 for inserting filtering parts; wherein each warp yarn is shuttled according to the respective initial position in the order of the surface layer, the middle layer, the inner layer and the middle layer as a cycle.

The above results show that: the stretch-proof high performance industrial filter cloth 1 in this embodiment forms an independent filter cloth surface layer 11, a filter cloth middle layer 12 and a filter cloth inner layer 13 with corresponding warps through three layers of wefts, and simultaneously, the filter cloth middle layer 12, the filter cloth inner layer 13 are connected into a whole with the filter cloth surface layer 11 and the filter cloth inner layer 13 by each group of warps or part of warps shuttling among the filter cloth surface layer 11, the filter cloth middle layer 12 and the filter cloth inner layer 13, and the space between the filter cloth surface layer 11 and the filter cloth inner layer 13 is divided into a plurality of tubular channels 14, and the tubular channels 14 which can be inserted with the filter part 15 and are independent are formed by the mutual cross exchange of warps at the connection part and the interval part. And because the warp that constitutes each layer can adopt same loom to make, therefore its tension can keep unanimous, thereby make the difference of the shrinkage factor of every warp less, and be a part of each layer respectively, and then make and form into an organic whole between top layer, intermediate level and the nexine, be difficult for appearing the weak link, because when receiving external force impact or horizontal stretching, all receive tensile effect between each layer, the atress is even and be difficult for appearing the weak link because of the connection between layer is not inseparable between the layer, consequently, the industrial filtration cloth that this application provided simple structure, and can avoid local region to appear the weak link and influence stretch resistance and anti extensibility nature betterly, improved tensile resistance and anti extensibility nature. Here, it is worth saying that the high performance in the present embodiment only refers to the industrial filter cloth in the prior art, which has better stretch-proof performance and stretch-proof performance, and is not described again.

In addition, the filter cloth cuts the filtrate for many times through the plurality of tubular channels 14, so that the filtering effect of the filter cloth can be increased, and the compression resistance of the filter cloth is enhanced.

Further preferably, at least some of the warp yarns and the weft yarns are first yarns for stretch resistance and second yarns for stretch resistance, respectively; wherein the initial modulus of the first yarn is less than the initial modulus of the second yarn; the first yarn has an elongation at break greater than the elongation at break of the second yarn. Wherein the first yarn has a rebound at 3% set elongation of greater than 85%; through the cooperation of the first yarns and the second yarns with the performances, the stretch-proofing performance of the industrial filter cloth is mainly determined by the second yarns, the defect that the stretch-proofing performance of the filter cloth in the prior art is poor due to the fact that the breaking strength of part of the yarns is low can be overcome, the filter cloth is mainly determined by the stretch-proofing performance of the second yarns when stressed, meanwhile, the filter cloth has good rebound resilience when stressed to impact or stretched by means of the high elastic recovery rate of the first yarns, the stability of the structure is kept, and therefore the stretch-proofing performance of the industrial filter cloth is good.

Further, as a preferable mode, the initial modulus of the second yarn in this example is more than 6N/tex; the breaking strength of the second yarn is more than 0.5N/tex, and the second yarn has higher tensile resistance. And when the initial modulus of the first yarn is less than 0.6N/tex and the elongation at break is more than 18%, the first yarn has higher anti-extension performance.

Obviously, the first yarn and the second yarn in this embodiment may also be the same type of yarn, and the stretch-proof performance of the yarn satisfy the above conditions, and therefore, the detailed description thereof is omitted.

In order to meet the actual use requirement, the first yarn can be composed of any one or the combination of polybutylene terephthalate fiber (PBT), 1, 3-propylene terephthalate fiber (PTT), polyurethane fiber (PU) and polyethylene terephthalate fiber (PET); the second yarns may be composed of any one or a combination of Carbon Fibers (CF), polyethylene terephthalate fibers (PET), poly (paraphenylene terephthalamide) fibers (PPTA), ultra-high molecular weight polyethylene fibers (UHMWPE), and polyamide fibers (PA). Therefore, through the mutual cooperation between the first yarns with high elastic modulus and the second yarns with high tensile modulus, the industrial filter cloth has high tensile property by means of the two yarns, and meanwhile, the industrial filter cloth has high elasticity by means of the second yarns, so that the anti-stretching property is improved. In addition, the high elasticity of the first yarns can ensure that the filter holes of the filter cloth can not expand greatly under the condition of long-term stress, and the filter cloth has good filtering performance and can be repeatedly used for a long time.

In detail, the warp yarns in the present embodiment may be preferably arranged in such a manner that the first yarns and the second yarns are arranged at equal intervals; meanwhile, the weft yarns can also be arranged in a mode of arranging the first yarns and the second yarns at intervals, so that the industrial filter cloth can have better tensile property and anti-stretching property no matter stressed in the warp direction or the weft direction.

In addition, the first and second yarns in this embodiment further comprise: any one or a combination of polyphenylene sulfide fiber (PPS), polytetrafluoroethylene fiber (PTFE), polyphenylene sulfide fiber (PPS) and polyether ether ketone (PEEK). The fibers are mixed in the first yarn and the second yarn and twisted into fibers, so that the first yarn and the second yarn have high-temperature-resistant and corrosion-resistant functions, and the formed filter cloth has high tensile resistance, high ductility resistance and high-temperature-resistant and corrosion-resistant performances.

In addition, the filter cloth can be provided with a filtering function by inserting the filtering part 15 into the tubular passage 14, for example, a material such as an adsorbent or an ion exchanger is inserted, thereby having strong practicability. The cross section of the tubular passage 14 is not limited to a circular shape, and may be other tubular shapes such as an elliptical shape and a flat shape.

In addition, since the warp yarns are shuttled in the same cycle, the independent tubular passages 14 can be uniformly distributed and have the same size no matter what weave structure is adopted, and the filling and the arrangement of the filter element 15 are convenient.

Preferably, the width of the tubular passage 14 in the present embodiment is 1 to 10 cm. To meet the assembly requirements of the different filter elements 15. The intermediate layer in the present embodiment is preferably a single layer.

In addition, in the present embodiment, the cover factor of the filter cloth surface layer 11, the filter cloth inner layer 13, and the filter cloth intermediate layer 12 is 1600 to 2700, and at least one of the warp and the weft includes: a fiber yarn composed of a plurality of profile fibers; wherein, the section shape of the profiled fiber is any one or the combination of a triangle, a Y shape, a pentagon, a trefoil, a quadralobe, a pentagon and a fan.

Through the supporting of mutually supporting between dysmorphism fibre and dysmorphism fibre or the non-dysmorphism fibre in the warp, can be under the circumstances of guaranteeing filter cloth intensity, make warp or woof that have the dysmorphism fibre can produce more hole, and make warp and woof interweave the back, even the range between warp and the woof is comparatively inseparable, but compare with traditional filter cloth, under equal longitude and latitude yarn density, its hole quantity is more, and be the distribution of irregularity mostly, be less than 1 mu m ~ 20 mu m usually, therefore, it can be when filtering the granule, with the help of the quantity advantage in hole, the air permeability of filter cloth has been promoted, promote the filter effect promptly, be difficult for producing the jam.

Through the aperture setting of this filter cloth and above-mentioned structural parameter for the filter cloth is when the initial stage is filtered, and the filter cloth can not be passed through effectively to granule more than 5um in the filtrating, can play prefiltration's effect. In addition, since the filter cloth of the present embodiment adopts a multi-layer structure, the filtering effect of the single-layer filter cloth, which accounts for 80% or more of the pore diameter of 5um or less, is the same as the filtering effect of the single-layer filter cloth, which accounts for 90% or more of the pore diameter of 5um or less, used in the prior art, so that the process structure can be simplified, the filtering effect can be ensured, and the water permeability per unit time can be increased.

In addition, the air permeability of the industrial filter cloth 1 in the embodiment is preferably 10-30 mm/s, so that the filtering efficiency is ensured while the filtering effect is not influenced.

In addition, as a preferable mode, in one weave circulation, the warp and weft yarn density of the surface layer and the inner layer in the embodiment is the same, and the warp and weft yarn density of the middle layer is 1-1/4 times of the warp and weft yarn density of the surface layer and the inner layer. Also, the length of each warp yarn in the middle layer is the same within one stitch cycle.

It should be noted that the warp yarns and the weft yarns in the present embodiment are not limited to the yarns using the previous parameters, and other yarns with high stretch resistance and/or high stretch resistance in the prior art may be used, which is not described herein again.

In addition, the embodiment also provides a preparation method of the extension-resistant and stretch-resistant high-performance industrial filter cloth 1, which comprises the following steps:

step 1: each warp yarn shuttles back and forth according to the sequence of the surface layer, the middle layer, the inner layer and the middle layer according to the respective initial position, and is respectively interwoven with the surface layer weft yarn, the middle layer weft yarn and the inner layer weft yarn to form a filter cloth surface layer, a filter cloth middle layer and a filter cloth inner layer; the warp yarns shuttle back and forth among the filter cloth surface layer, the filter cloth middle layer and the filter cloth inner layer, and are mutually crossed and exchanged at the joint of the filter cloth middle layer and the filter cloth surface layer and the joint of the filter cloth inner layer, and are crossed and exchanged at the interval of the filter cloth middle layer, so that the space between the filter cloth surface layer and the filter cloth inner layer is divided into a plurality of tubular channels for inserting the filtering parts.

And, before step 1, the method further comprises the following steps:

step 01: adopting yarns with the anti-extension and/or anti-stretching performance as warp yarns;

step 02: the yarn with the stretch-proof and/or stretch-proof performance is adopted as the weft yarn, wherein the warp yarn and the weft yarn at least comprise one yarn with the stretch-proof performance and one yarn with the stretch-proof performance or one yarn with the stretch-proof performance and the stretch-proof performance.

Step 03: and arranging the yarns with the stretch resistance and the yarns with the stretch resistance at equal intervals in the warp direction and the weft direction. The equal spacing arrangement can be 1:1 spacing arrangement, and can also be 1:2 spacing arrangement or other multiples of spacing arrangement.

In addition, as an optimal mode, in order to meet the actual application requirements, balance the filtering efficiency and the filtering effect and reasonably control the production cost of the industrial filter cloth while ensuring the anti-extension performance and the anti-stretching performance of the industrial filter cloth, the linear density of the warp yarns and the weft yarns of the industrial filter cloth in the embodiment is preferably 60-1000 dex; the twist of the filter cloth of the warp and the weft is 200-800T/M; the average pore diameter of the filter pores is preferably 1-20 um. The warp density of the industrial filter cloth is preferably 60-200 pieces/inch; the warp density is preferably 60 to 200 threads/inch.

Second embodiment

A second embodiment of the present invention provides a stretch-resistant, high performance industrial filter cloth, which is substantially the same as the above-described embodiments except that, as shown in fig. 3 and 4, the middle layer in this embodiment is a double-layer or multi-layer spacing structure to match different types of filter members 15 to meet the filtering requirements of different filtrates. In which the individual warp yarns may be crossed and interchanged several times in the intermediate layer at the intervals of the tubular passage 14 according to the above-described circulation pattern, so as to form a double-layer and multi-layer spacing configuration.

In addition, the middle layer is a spacing structure with more than two layers; wherein, the material of the filter component that sets up in the tubular passage in adjacent two-layer is different, consequently, when filtering liquid through this industrial filter cloth, with the help of filter component 15 in the tubular passage of different layers, filters different substances in the filtrating for the filtrating can be effectively and abundant filtration. In addition, different substances in the filtrate are adsorbed or exchanged through the filtering components 15 made of different materials, so that the different substances in the filtrate can be exchanged and recovered. For example: the sodium resin releases Na + during filtration, and exchanges and adsorbs cations such as Ca2+, Mg2+ in the filtrate to adsorb and recover metals such as Ca and Mg, thereby reducing the hardness of water in the filtrate, for example, softening drinking water or gypsum water.

As shown in fig. 4, the industrial filter cloth is described by taking a three-layer structure as an example, wherein the first layer is a filter member made of activated carbon filter material, the second layer is a filter member made of cation resin, and the third layer is a filter member made of anion resin, so as to realize filtration with different functions.

In detail, as a preferable mode, each tubular passage of the industrial filter cloth in the present embodiment is partially coated with a water release coating to form a water blocking area, and forms a fluid passage through which filtrate sequentially flows through each tubular passage. Thereby prolonging the filtering length and the filtering time of the filtrate with the same volume in the industrial filter cloth so as to improve the purifying effect.

In addition, when the material of the filter component that sets up in the tubular passage in adjacent two-layer is different, can make the filter component of different materials all be located this fluid passage in proper order to make filtrating pass through each filter component according to fluid passage's flow direction, so that the filtrating can contact with different filter components, realize multi-functional filtration, for example different ionic filtration, satisfy different purification process's demand.

As will be briefly described with reference to fig. 4, after the weaving of the raw cloth of the industrial filter cloth is completed, the raw cloth filter cloth is placed on a mold having a shape similar to that of the filter member 15, and a water-release coating is applied to an area where the water-blocking area is located through the mold and dried to cool therein. The water-barrier region is shown in the region a1 in fig. 4 and the regions a1 and B1 in fig. 3, while the filter region in the intermediate layer is shown in the region a2 in fig. 4 and the regions a2 and B2 in fig. 4. After the filtrate permeates into the middle layer from the surface layer of the filter cloth, the filtrate flows through the filter member 15a in the tubular passage 14a, enters the tubular passage 14B from the permeation region a2, flows through the filter member 15B, enters the tubular passage 14c from the permeation region B2, flows through the filter member 15c, and permeates from the inner layer of the filter cloth to the outside.

Third embodiment

A third embodiment of the invention provides an industrial filter cloth with high performance of stretch resistance and tensile resistance, which is a preferred embodiment of one or two of the above embodiments.

In this embodiment, a single-shaft dobby loom is used for weaving, in which warp and weft yarn densities are woven according to the parameters in table 1 below to obtain a gray fabric, and the gray fabric is refined, heat-set, dried, and then subjected to a finishing process, such as calendering at a pressure of 1.5MPa, to obtain a finished filter cloth. Here, the refining temperature in the present example is preferably 90 ℃. The heat-setting temperature is preferably 130 to 180 ℃. The average pore diameter of the filter pores of the industrial filter cloth is between 1 and 20 mu m; the warp and weft density is preferably 90 to 150 pieces/inch, and the linear density of the warp and weft is preferably 60 to 200 dtex.

And then, taking 5 samples with the specification of 5cm by 5cm at three positions randomly for the produced filter cloth finished product, placing the samples into filtering equipment for testing, observing the filtrate condition of the stretch-resistant and stretch-resistant high-performance industrial filter cloth 1, and carrying out statistical calculation on various parameters, wherein the parameters are shown in the following table 1. Wherein, A represents that the filtrate is clear and has no pollution, B represents that the filtrate is clear and has slight pollution, C represents that the filtrate is turbid and has obvious pollution, and D represents that the filtrate is turbid and has serious pollution. Wherein A represents that the solid content in the filtrate is 0-0.5% (not including 0.5%); b represents that the solid content in the filtrate is 0.5-2.0% (not including 2.0%); c represents the solid content in the filtrate is 0-10.0% (not including 10.0%); d represents that the solid content in the filtrate is more than or equal to 10.0 percent. Wherein, the solid content in the filtrate can be calculated after being filtered by the extension-resistant and stretch-resistant high-performance industrial filter cloth 1, weighed and dried to obtain the solid content. In the present embodiment, the coverage coefficient of the filter cloth is obtained by the following calculation formula:

wherein: NW: warp density of the fabric (root/inch); DW: the fineness of the warp filaments in the fabric (dtex); nf: weft density of the fabric (root/inch); df: the fineness of the weft filaments in the fabric (dtex).

In addition, the finished filter cloth is tested according to the JISL1096-2010 standard before filtration;

in addition, after filtering, the finished filter cloth is subjected to uniaxial tension test on a fabric strength tester, and the average value is calculated, wherein the test temperature is 20 ℃ and the relative humidity is 65%.

In this embodiment, the invention is described below with reference to some preferred examples:

example 1

On a single-beam dobby loom, yarns with single-bundle fiber cross-sectional shapes being oval and the specification being 100dtex-PET are used as warp yarns, and yarns with single-bundle fiber cross-sectional shapes being oval and the specification being 100dtex-PET are used as weft yarns I; and the yarn with the cross section of the single-bundle fiber in a pentalobal shape and the specification of 100dtex-PET is used as a second weft yarn, wherein the ratio of the first weft yarn to the second weft yarn is 3: 1. Weaving with 12 heald frames according to the warp and weft yarn density (surface layer and inner layer of 90 x 72 pieces/inch; middle layer of 45 x 36 pieces/inch) in the following table 1 to obtain a grey cloth, refining, heat setting, drying, and finishing, such as calendering at a pressure of 1.5MPa, to obtain a finished filter cloth. Wherein, the surface layer, the middle layer and the inner layer are all plain weave, and the three layers adopt the connection mode of mutual exchange.

As can be seen from table 1 below: the proportion of the pore diameter of the surface layer and the inner layer of the filter cloth provided by the embodiment 1 below 5um accounts for more than 80 percent; the coverage factor is 1620; the air permeability is 13.7 mm/s; the filtering effect grade is C; a warp break strength of about 3197N; the weft break force was approximately 2661N.

Example 2

On a single-beam dobby loom, yarns with single-bundle fiber cross-sectional shapes being oval and the specification being 100dtex-PET are used as warp yarns, and yarns with single-bundle fiber cross-sectional shapes being oval and the specification being 100dtex-PET are used as weft yarns I; and the yarn with the cross section of the single-bundle fiber in a pentalobal shape and the specification of 100dtex-PET is used as a second weft yarn, wherein the ratio of the first weft yarn to the second weft yarn is 3: 1. Weaving with 12 heald frames according to the warp and weft yarn density (106 × 100 yarns/inch for the surface layer and the inner layer and 53 × 50 yarns/inch for the middle layer) in the following table 1 to obtain a grey fabric, refining, heat setting, drying, and finishing, for example, calendering at a pressure of 1.5MPa, to obtain a finished filter cloth. Wherein, the surface layer, the middle layer and the inner layer are all plain weave, and the three layers adopt the connection mode of mutual exchange.

As can be seen from table 1 below: the proportion of the pore diameter of the surface layer and the inner layer of the filter cloth provided by the embodiment 2 below 5um accounts for more than 82 percent; coverage factor is 2060; the air permeability is 12.3 mm/s; the filtering effect grade is C; the warp break strength is about 3766N; the weft break strength was about 3005N.

Example 3

On a single-beam dobby loom, yarns with single-bundle fiber cross-sectional shapes being oval and the specification being 100dtex-PET are used as warp yarns, and yarns with single-bundle fiber cross-sectional shapes being oval and the specification being 100dtex-PET are used as weft yarns I; and the yarn with the cross section of the single-bundle fiber in a pentalobal shape and the specification of 100dtex-PET is used as a second weft yarn, wherein the ratio of the first weft yarn to the second weft yarn is 3: 1. Weaving by 12 heald frames according to the warp and weft yarn density (surface layer and inner layer of 120 x 120 pieces/inch; middle layer of 60 x 60 pieces/inch) in the following table 1 to obtain a grey cloth, refining, heat setting, drying, and finishing, such as calendering at a pressure of 1.5MPa, to obtain a finished filter cloth. Wherein, the surface layer, the middle layer and the inner layer are all plain weave, and the three layers adopt the connection mode of mutual exchange.

As can be seen from table 1 below: the proportion of the pore diameter of the surface layer and the inner layer of the filter cloth provided by the embodiment 3 below 5um is more than 83%; the coverage factor is 2400; the air permeability is 11.5 mm/s; the filtering effect grade is C; a warp break strength of about 4261N; the weft breaking force was about 3415N.

Example 4

On a single-beam dobby loom, yarns with single-bundle fiber cross-sectional shapes being oval and the specification being 100dtex-PET are used as warp yarns, and yarns with single-bundle fiber cross-sectional shapes being oval and the specification being 100dtex-PET are used as weft yarns I; and the yarn with the cross section of the single-bundle fiber in a pentalobal shape and the specification of 100dtex-PET is used as a second weft yarn, wherein the ratio of the first weft yarn to the second weft yarn is 2: 1. Weaving by 12 heald frames according to the warp and weft yarn density (surface layer and inner layer of 120 x 120 pieces/inch; middle layer of 60 x 60 pieces/inch) in the following table 1 to obtain a grey cloth, refining, heat setting, drying, and finishing, such as calendering at a pressure of 1.5MPa, to obtain a finished filter cloth. Wherein, the surface layer, the middle layer and the inner layer are all plain weave, and the three layers adopt the connection mode of mutual exchange.

As can be seen from table 1 below: the proportion of the pore diameter of the surface layer and the inner layer of the filter cloth provided by the embodiment 4 below 5um is more than 85 percent; the coverage factor is 2400; the air permeability is 13.2 mm/s; the filtering effect grade is B; a warp break strength of about 4257N; the weft break strength was about 3471N.

Example 5

On a single-beam dobby loom, yarns with single-bundle fiber cross-sectional shapes being oval and the specification being 100dtex-PET are used as warp yarns, and yarns with single-bundle fiber cross-sectional shapes being oval and the specification being 100dtex-PET are used as weft yarns I; and the yarn with the cross section of the single-bundle fiber in a pentalobal shape and the specification of 100dtex-PET is used as a second weft yarn, wherein the ratio of the first weft yarn to the second weft yarn is 1: 1. Weaving by 12 heald frames according to the warp and weft yarn density (surface layer and inner layer of 120 x 120 pieces/inch; middle layer of 60 x 60 pieces/inch) in the following table 1 to obtain a grey cloth, refining, heat setting, drying, and finishing, such as calendering at a pressure of 1.5MPa, to obtain a finished filter cloth. Wherein, the surface layer, the middle layer and the inner layer are all plain weave, and the three layers adopt the connection mode of mutual exchange.

As can be seen from table 1 below: the proportion of the pore diameter of the surface layer and the inner layer of the filter cloth provided by the embodiment 5 below 5um accounts for more than 90 percent; the coverage factor is 2400; the air permeability is 13.9 mm/s; the filtering effect grade is A; a warp break strength of about 4263N; the weft break strength was about 3556N.

Example 6

On a single-beam dobby loom, yarns with single-bundle fiber cross-sectional shapes being oval and the specification being 100dtex-PET are used as warp yarns, and yarns with single-bundle fiber cross-sectional shapes being oval and the specification being 100dtex-PET are used as weft yarns I; and the yarn with the cross section of the single-bundle fiber in a pentalobal shape and the specification of 100dtex-PET is used as a second weft yarn, wherein the ratio of the first weft yarn to the second weft yarn is 1: 2. Weaving by 12 heald frames according to the warp and weft yarn density (surface layer and inner layer of 120 x 120 pieces/inch; middle layer of 60 x 60 pieces/inch) in the following table 1 to obtain a grey cloth, refining, heat setting, drying, and finishing, such as calendering at a pressure of 1.5MPa, to obtain a finished filter cloth. Wherein, the surface layer, the middle layer and the inner layer are all plain weave, and the three layers adopt the connection mode of mutual exchange.

As can be seen from table 1 below: the ratio of the pore diameter of the surface layer to the pore diameter of the inner layer of the filter cloth provided in example 6 of 5um or less is 93% or more; the coverage factor is 2400; the air permeability is 15.6 mm/s; the filtering effect grade is A; a warp break strength of about 4265N; the weft break strength was approximately 3611N.

Example 7

On a single-beam dobby loom, yarns with single-bundle fiber cross-sectional shapes being oval and the specification being 100dtex-PET are used as warp yarns, and yarns with single-bundle fiber cross-sectional shapes being oval and the specification being 100dtex-PET are used as weft yarns I; and the yarn with the cross section of the single-bundle fiber in a pentalobal shape and the specification of 100dtex-PET is used as a second weft yarn, wherein the ratio of the first weft yarn to the second weft yarn is 1: 2. Weaving with 12 heald frames according to the warp and weft yarn density (149 x 118 yarns/inch for the surface layer and the inner layer and 74 x 59 yarns/inch for the middle layer) in the following table 1 to obtain a grey cloth, refining, heat setting, drying, and finishing, such as calendering at a pressure of 1.5MPa, to obtain a finished filter cloth. Wherein, the surface layer, the middle layer and the inner layer are all plain weave, and the three layers adopt the connection mode of mutual exchange.

As can be seen from table 1 below: the ratio of the pore diameter of the surface layer to the pore diameter of the inner layer of the filter cloth provided in example 7 of 5um or less accounts for 91% or more; the coverage factor is 2670; the air permeability is 11.3 mm/s; the filtering effect grade is A; the warp breaking strength is about 5823N; the weft break strength was about 3951N.

Example 8

On a single-beam dobby loom, a single-bundle fiber yarn with an oval cross-sectional shape and a specification of 100dtex-PET is used as a warp yarn, and an elastic fiber yarn with a single-bundle fiber cross-sectional shape of oval and a specification of PBT/PET is used as a weft yarn I; and the yarn with the cross section of the single-bundle fiber in a pentalobal shape and the specification of 100dtex-PET is used as a second weft yarn, wherein the ratio of the first weft yarn to the second weft yarn is 1: 2. Weaving with 12 heald frames according to the warp and weft yarn density (149 x 118 yarns/inch for the surface layer and the inner layer and 74 x 59 yarns/inch for the middle layer) in the following table 1 to obtain a grey cloth, refining, heat setting, drying, and finishing, such as calendering at a pressure of 1.5MPa, to obtain a finished filter cloth. Wherein, the surface layer, the middle layer and the inner layer are all plain weave, and the three layers adopt the connection mode of mutual exchange.

As can be seen from table 1 below: the ratio of the pore diameter of the surface layer to the pore diameter of the inner layer of the filter cloth provided in example 8 of 5um is 93% or more; the coverage factor is 2670; the air permeability is 12.6 mm/s; the filtering effect grade is A; the warp breaking strength is about 5813N; the weft break strength was about 3012N.

Example 9

On a single-beam dobby loom, single-bundle elastic fiber yarns with elliptical fiber cross-sectional shapes and PBT/PET specifications are used as warp yarns, and single-bundle elastic fiber yarns with elliptical fiber cross-sectional shapes and PBT/PET specifications are used as weft yarns I; yarns with five-leaf cross-section shapes and 100dtex-PET specifications of single-bundle fibers are used as weft yarns, wherein the ratio of the weft yarn I to the weft yarn II is 1: 2. Weaving with 12 heald frames according to the warp and weft yarn density (149 x 118 yarns/inch for the surface layer and the inner layer and 74 x 59 yarns/inch for the middle layer) in the following table 1 to obtain a grey cloth, refining, heat setting, drying, and finishing, such as calendering at a pressure of 1.5MPa, to obtain a finished filter cloth. Wherein, the surface layer, the middle layer and the inner layer are all plain weave, and the three layers adopt the connection mode of mutual exchange.

As can be seen from table 1 below: the ratio of the pore diameter of the surface layer to the pore diameter of the inner layer of the filter cloth provided in example 9, which is less than 5um, is more than 96%; the coverage factor is 2670; the air permeability is 15.3 mm/s; the filtering effect grade is A; a warp break strength of about 4833N; the weft break strength was about 3002N.

Example 10

On a single-beam dobby loom, yarns with a single-bundle fiber cross section in a five-leaf shape and a specification of 110dtex-PPTA (poly-p-phenylene terephthalamide) fiber are adopted as warp yarns; elastic fiber yarns with elliptical cross-sectional shapes and PBT/PET specifications of single-bundle fibers are used as weft yarns I; and the second weft yarn is the yarn with the cross section of the single-bundle fiber in a pentalobal shape and the specification of 100 dtex-PET. Wherein the ratio of the weft yarn I to the weft yarn II is 1: 2.

Weaving with 12 heald frames according to the warp and weft yarn density (149 x 118 yarns/inch for the surface layer and the inner layer and 74 x 59 yarns/inch for the middle layer) in the following table 1 to obtain a grey cloth, refining, heat setting, drying, and finishing, such as calendering at a pressure of 1.5MPa, to obtain a finished filter cloth. Wherein, the surface layer, the middle layer and the inner layer are all plain weave, and the three layers adopt the connection mode of mutual exchange.

As can be seen from table 1 below: the proportion of the pore diameter of the surface layer and the inner layer of the filter cloth provided in the embodiment 10 being less than 5um is more than 92%; the coverage factor is 2670; the air permeability is 15.1 mm/s; the filtering effect grade is A; a warp break strength of about 16921N; the weft breaking force was about 3826N.

Example 11

On a single-beam dobby loom, yarns with a single-bundle fiber cross section in a five-leaf shape and a specification of 110dtex-PPTA (poly-p-phenylene terephthalamide) fiber are adopted as warp yarns; elastic fiber yarns with elliptical cross-sectional shapes and PBT/PET specifications of single-bundle fibers are used as weft yarns I; and the second weft yarn is a yarn with a five-lobe cross section of single-strand fiber and the specification of 110dtex-PPTA (poly-p-phenylene terephthamide fiber). Wherein the ratio of the weft yarn I to the weft yarn II is 1: 2. Weaving with 12 heald frames according to the warp and weft yarn density (149 x 118 yarns/inch for the surface layer and the inner layer and 74 x 59 yarns/inch for the middle layer) in the following table 1 to obtain a grey cloth, refining, heat setting, drying, and finishing, such as calendering at a pressure of 1.5MPa, to obtain a finished filter cloth. Wherein, the surface layer, the middle layer and the inner layer are all plain weave, and the three layers adopt the connection mode of mutual exchange.

As can be seen from table 1 below: the ratio of the pore diameter of the surface layer to the pore diameter of the inner layer of the filter cloth provided in example 11, which is less than 5um, is 95% or more; the coverage factor is 2670; the air permeability is 14.9 mm/s; the filtering effect grade is A; a warp break strength of about 17725N; the weft break strength was about 7023N. The preferred polyphenylene terephthalamide fiber (PPTA) is adopted in the embodiment, and Kevlar29 fiber is selected as the specification, the elongation at break is 3.6%, the breaking strength is 2.03N/tex, and the specific modulus is 49N/tex, so that the formed yarn has good tensile property and ductility resistance.

Example 12

On a single-beam dobby loom, yarns with single-bundle fibers, wherein the cross section of each yarn is oval and the specification of each yarn is 100dtex-PET, are used as warp yarns; the weft yarn is a yarn with a single-bundle fiber cross-section of oval shape and 100dtex-PET specification. Weaving with 12 heald frames according to the warp and weft yarn density (surface layer and inner layer of 90 x 72 pieces/inch; middle layer of 45 x 36 pieces/inch) in the following table 1 to obtain a grey cloth, refining, heat setting, drying, and finishing, such as calendering at a pressure of 1.5MPa, to obtain a finished filter cloth. Wherein, the surface layer, the middle layer and the inner layer are all plain weave, and the three layers adopt the connection mode of mutual exchange.

As can be seen from table 1 below: the proportion of pore diameters of the surface layer and the inner layer of the filter cloth provided in example 12 being less than 5um is more than 78%; the coverage factor is 1620; the air permeability is 10.5 mm/s; the filtering effect grade is C; the warp break strength was about 2925N; the weft breaking force was about 1941N.

Example 13

On a single-beam dobby loom, yarns with single-bundle fibers, wherein the cross section of each yarn is oval and the specification of each yarn is 100dtex-PET, are used as warp yarns; the weft yarn is a yarn with a single-bundle fiber cross-section of oval shape and 100dtex-PET specification. Weaving with 12 heald frames according to the warp and weft yarn density (149 x 118 yarns/inch for the surface layer and the inner layer and 74 x 59 yarns/inch for the middle layer) in the following table 1 to obtain a grey cloth, refining, heat setting, drying, and finishing, such as calendering at a pressure of 1.5MPa, to obtain a finished filter cloth. Wherein, the surface layer, the middle layer and the inner layer are all plain weave, and the three layers adopt the connection mode of mutual exchange.

As can be seen from table 1 below: the ratio of the pore diameter of the surface layer to the pore diameter of the inner layer of the filter cloth provided in example 13 being 5um or less is 90% or more; the coverage factor is 2670; the air permeability is 5.3 mm/s; the filtering effect grade is A; a warp break strength of about 5275N; the weft breaking force was about 3827N.

Comparative example 14

The method comprises the following steps of (1) adopting yarns with elliptical single-bundle fiber cross-section and 100dtex-PET specification as warp yarns; the weft yarn is a yarn with a single-bundle fiber cross-section of oval shape and 100dtex-PET specification. Weaving by using 12 heald frames according to the warp and weft yarn density (90 × 72/inch) in the following table 1 to obtain an independent single-layer grey cloth, refining, heat setting and drying the grey cloth, then performing after-finishing treatment, such as calendering treatment under the pressure of 1.5MPa to obtain a finished filter cloth, and forming the filter cloth with a multi-layer structure by sewing. Wherein, each layer of the filter cloth is a plain weave.

As can be seen from table 1 below: the filter cloth provided in example 14 has a pore diameter of 5um or less accounting for 75% or more; the coverage factor is 1620; the air permeability is 7.1 mm/s; the filtering effect grade is D; the warp break strength was approximately 2636N; the weft break force was approximately 1916N.

Comparative example 15

The method comprises the following steps of (1) adopting yarns with elliptical single-bundle fiber cross-section and 100dtex-PET specification as warp yarns; the weft yarn is a yarn with a single-bundle fiber cross-section of oval shape and 100dtex-PET specification. The cloth is then refined, heat-set, dried, and post-finished, for example, calendered at a pressure of 1.5MPa to produce a finished filter cloth, using a single layer of gray cloth woven with 12 frames according to the warp and weft yarn density (90 x 72 yarns/inch) in table 1 below. Wherein the weave of the single-layer filter cloth is a plain weave.

As can be seen from table 1 below: the filter cloth provided in example 14 has a pore diameter of 5um or less accounting for 75% or more; the coverage factor is 1620; the air permeability is 12.3 mm/s; the filtering effect grade is D; a warp break strength of about 1267N; the weft break force was about 1018N.

In conclusion: as can be seen from examples 1 to 3: when the adopted materials and the proportion of the warp yarns and the weft yarns are the same, the breaking strength of the warp yarns and the weft yarns is continuously increased along with the increase of the density of the warp yarns and the weft yarns. Also, according to example 1 and comparative example 13; when the yarn adopts the cross section of special-shaped cross section, the breaking strength is obviously improved. It is understood from example 1 and comparative example 15 that the breaking strength of the filter cloth in the present application can be gradually lowered without being affected by the warp and weft yarn density of the intermediate layer and the weak loops appear.

From examples 4 to 6, it can be seen that: along with the increase of the proportion of the yarn formed by the fibers with the special-shaped cross sections in the weft yarns, the breaking strength of the weft yarns is slightly improved.

From examples 7 to 9, it can be seen that: when the warp and weft yarn density and the fabric cover coefficient are the same, the breaking strength is slightly reduced along with the increase of the proportion occupied by the yarns formed by the elastic fibers.

From examples 9 to 10, it can be seen that: when the warp yarn part is woven by using yarns with ultrahigh breaking strength, such as poly (p-phenylene terephthalamide) (PPTA) fibers with tensile resistance, the breaking strength in the warp direction can be remarkably improved, so that the filter cloth has higher tensile resistance in the warp direction. And the weft yarns of the filter cloth adopt the matching of the first yarns formed by the stretch-resistant PET fibers and the second yarns formed by the stretch-resistant PBT/PET elastic fibers, so that the filter cloth also has better tensile property and stretch resistance, but compared with the warp yarns adopting ultrahigh breaking strength, the weft breaking strength of the filter cloth still has a larger difference with the warp breaking strength.

The comparison between example 10 and example 11 shows that: the filter cloth is characterized in that high-elasticity yarns, such as the yarns formed by anti-ductility PBT/PET elastic fibers, are used as first yarns, and the yarns formed by ultrahigh breaking strength yarns, such as the yarns formed by poly-p-phenylene terephthamide fibers (PPTA), with tensile resistance are used as second yarns to be matched, so that the filter cloth still has higher breaking strength in the weft direction, namely, better tensile resistance is achieved, and meanwhile, the breaking elongation of the first yarns is greater than that of the second yarns, so that the breaking strength of the filter cloth in the weft direction mainly depends on the second yarns, and the tensile resistance of the filter cloth can be greatly improved and the filter cloth also has higher tensile resistance through the matching of the first yarns and the second yarns.

In addition, the poly (p-phenylene terephthalamide) fiber (PPTA) in the present embodiment may be replaced with a Carbon Fiber (CF), a poly (ethylene terephthalate) fiber (PET), a poly (p-phenylene terephthalamide) fiber (PPTA), an ultra-high molecular weight polyethylene fiber (UHMWPE), a polyamide fiber (PA), or the like. Further, the PBT/PET elastic fiber may be replaced with polybutylene terephthalate fiber (PBT), 1, 3-propylene terephthalate fiber (PTT), polyurethane fiber (PU), polyethylene terephthalate fiber (PET), or the like, for example: the adopted polyamide fiber (PA) has the elongation at break of 25-55%, the breaking strength of 0.38-0.62 and the initial modulus of 0.17-2.65, so that the formed yarn has good tensile property and anti-stretching property. And will not be described in detail herein.

It is understood from examples 1 to 3 and comparative example 11 that, when the texture parameters of the filter cloth are the same, the air permeability is decreased as the cover factor is increased, but the ratio of the pore diameter of 5um or less is gradually increased, and the filtering effect is gradually increased. Moreover, when the filter cloth woven by the yarns made of the profiled fibers is adopted, compared with the filter cloth woven by the yarns not made of the profiled fibers, the air permeability is higher under the same coverage coefficient, the proportion of the pore diameter below 5um is larger than eighty percent, and the filtering effect is better.

It can be seen from example 12 and comparative example 14 that the filter cloth having a multi-layer structure has a larger proportion of pore sizes of 5um or less and a better filtering effect under the same coverage factor.

As is clear from examples 4 to 6, the ratio of the pore diameter of 5um or less is increased and the air permeability is increased with the increase in the ratio of the yarn composed of the conjugate fibers at the same covering factor, and the filtration effect is not decreased but increased from class B to class a.

It can be known from embodiments 7 to 8 that, under the same cover factor, when the filter cloth that the yarn that adopts profiled fiber to constitute and the yarn that elastic fiber constitutes went on weaving, the filter cloth that the yarn that adopts profiled fiber to constitute was weavingd alone relatively, its air permeability is better, and the aperture is higher at the proportion that the yarn that adopts profiled fiber to constitute less than 5um, is favorable to guaranteeing the filter effect, promotes filtration efficiency.

Moreover, as can be seen from examples 8 to 9, the air permeability is better along with the increase of the proportion of the yarns composed of the elastic fibers, and the proportion of the pore diameter below 5um is higher, which is beneficial to improving the filtration efficiency while ensuring the filtration effect.

In addition, in this embodiment, as can be seen from example 1 to comparative example 15, the multi-layer stretch-proof and stretch-proof high performance industrial filter cloth has a long service life for a single-layer stretch-proof and stretch-proof high performance industrial filter cloth, and the yarn woven by the yarn made of elastic fiber and the yarn made of profiled fiber has a longer service life, so it can be seen that the filter cloth can be maintained in an effective slightly tensioned state for a long time by the cooperation between the yarn made of elastic fiber and the yarn made of profiled fiber, that is, under the elastic action of the yarn made of elastic fiber, so that when the filter cloth is used for a long time, the filter cloth can avoid that the filter holes in a partial region are enlarged due to the impact of the liquid to be filtered in the long-term use process, so that the filter cloth is damaged and cannot be effectively filtered, and the filter cloth has to be replaced in time.

As can be seen from the above and the following table 1, when the warp and weft yarn densities of the surface layer and the inner layer of the industrial filter cloth in the embodiment are greater than 90 × 72 and the cover factor is greater than 1600, and the warp and weft yarn densities of the middle layer are greater than 45 × 46 and the cover factor is greater than 800, the warp breaking strength is greater than 3000, the weft breaking strength is greater than 2600, and the industrial filter cloth has high tensile resistance, anti-stretching performance and filtering performance.

In addition, the PET fibers used in the above examples 1 to 12 and comparative examples 13 to 15 are preferably high-strength low-elongation type, and have 18 to 28% elongation at break, 0.53 to 0.62N/tex breaking strength and 6.17 to 7.94N/tex initial modulus, so that the resulting yarn has good tensile and anti-elongation properties.

TABLE 1

Embodiment IV

As shown in fig. 5 to 9, a fourth embodiment of the present invention provides an extension-resistant, stretch-resistant, high-performance industrial filter cloth, which is a further improvement of the extension-resistant, stretch-resistant, high-performance industrial filter cloth 1 mentioned in any of the above embodiments, and the improvement comprises: a connecting member 17 for connecting adjacent two filter elements 15; wherein, the connecting piece 17 includes: a first sleeve ring 16 sleeved on one filter element 15, a second sleeve ring 19 sleeved on an adjacent filter element 15, and a connecting shaft 171 for connecting the first sleeve ring 16 and the second sleeve ring 19; wherein, the first lantern ring 16 and the second lantern ring 19 are both provided with a through hole 166 for sleeving the filter component 15 and a flexible component 165 annularly arranged in the through hole 166 and used for closely contacting the filter component 15; the size of the through hole 166 gradually increases from the outside toward the inside of the sleeve filter member 15. By the structure, the user can tightly sleeve the first sleeve ring 16 and the second sleeve ring 19 on the filter element 15, and simultaneously, the position of the first sleeve ring 16 and the second sleeve ring 19 on the filter element 15 can be adjusted according to actual requirements. And, make two adjacent filter members 15 link together through the connecting piece 17, not only can make each filter member 15 link as an organic whole, still can make filter member 15 and industrial filter cloth form an organic whole, therefore when industrial filter cloth receives the pulling force that warp direction exerted, or the impact of filtrate, can promote tensile resistance and anti-extension performance when the industrial filter cloth is stressed. The flexible member 165 may be a rubber ring, a foam ring, or a metal spring.

In addition, the connecting piece 17 can facilitate the arrangement and the adjustment of the positions of all the filtering components and the assembly and the disassembly between the filtering components and the industrial filter cloth.

The connecting member 17 further includes: the two opposite ends are respectively connected with the first lantern ring 16 or the second lantern ring 19 and can be sleeved on the tension spring 18 on the filter part 15. The tension spring 18 can keep the first collar 16 and the second collar 19 in tension, and cannot be easily detached from the filter element 15.

In addition, the outer sides of the first collar 16 and the second collar 19 are provided with an annular groove 162 formed by sinking towards the inner side for clamping and connecting the connecting shaft 171; wherein. The connecting shaft 171 has a locking groove 172 which forms a snap-fit connection with the inner wall of the annular groove 162 of the first collar 16 or the second collar 19. One end wall of the locking groove 172 may be used to abut against an inner wall of the annular groove 162 of the first collar 16 or the second collar 19.

In addition, the first collar 16 and the second collar 19 may have magnetism, for example, the first collar 16 and the second collar 19 may be magnetic rings themselves, or magnetic rings may also be provided therein, and in the present implementation method, it is preferable that the collar bodies 161 of the first collar 16 and the second collar 19 have annular grooves on the inner side walls of the through holes 166 for placing the magnetic rings 164, so that the connecting shaft 171 can be automatically attracted to the position connected with the first collar 16 and the second collar 19 under the magnetic action, and therefore, in actual operation, the clamping grooves 172 of the connecting shaft 171 can be automatically attracted to the position clamped with the inner walls of the annular grooves 162 through the magnetic rings 164, or manually implemented, thereby facilitating the connection and the detachment between the two adjacent filter components 15.

In addition, in order to facilitate the connection between two adjacent collars of the connecting shaft 171, a rotating shaft hole 163 for inserting the connecting member 17 may be opened on the annular groove 162, wherein a rotating shaft 174 for inserting the rotating shaft hole 163 is provided at the tail of the connecting shaft 171, and a head 173 of the connecting shaft 171 is a tip portion that can be inserted between layers, so as to be inserted in a pipe passage of the industrial filter cloth to connect the first collar 16 or the second collar 19 on the filter member 15 disposed in the adjacent tubular passage.

It should be noted that the head 173 in this embodiment is a metal body that can be magnetically adsorbed, so as to more precisely realize the engagement between the locking groove 172 and the collar body 164, and facilitate the connection between two adjacent filter components, especially when the filter components are connected through the first collar or the second collar in two adjacent tubular channels, the engagement connection between two adjacent first collars or second collars can be realized without precise connection.

Fifth embodiment

As shown in fig. 2, a fifth embodiment of the present invention provides an extension-resistant, stretch-resistant, high-performance industrial filter cloth, which is a further improvement of the extension-resistant, stretch-resistant, high-performance industrial filter cloth 1 according to any of the above-mentioned embodiments, in that the surface layer 11 and/or the inner layer 13 of the filter cloth may preferably be an electrically conductive layer.

By arranging the surface layer 11 and/or the inner layer 13 of the filter cloth as a conductive layer, the electrostatic phenomenon can be prevented from occurring in the using process, so that the phenomenon that the pipeline is easy to explode due to the contact of dust caused by electrostatic discharge in the dry environment of the pipeline is avoided.

Specifically, the conductive effect can be achieved by coating a conductive coating on the surface layer 11 and the inner layer 13 of the filter cloth, or by forming the weft yarns in the surface layer 11 and the inner layer 13 of the filter cloth by using conductive fibers, or by forming the weft yarns by plating the conductive coating on the surface.

In the present embodiment, it is preferable that the filter cloth surface layer 11 and the filter cloth back layer 13 are provided as conductive layers. For example, when the surface layer 11 and the inner layer 13 of the filter cloth are coated with conductive coatings so that the stretch-resistant and stretch-resistant high-performance industrial filter cloth 1 is placed in a filtering device to filter liquid, the surface layer 11 and the inner layer 13 of the filter cloth can be used as electrodes, respectively, so that ion exchange can be performed after the tubular passage 14 is inserted into the filtering member 15 such as an ion exchange rod, thereby facilitating recycling of part of ions such as noble metal ions.

Thus, in view of the many possible embodiments to which the principles disclosed may be applied, it should be recognized that the above-described embodiments are meant to be illustrative only and should not be taken as limiting in scope. Accordingly, we reserve all rights to the subject matter disclosed herein, including the right to claim any and all combinations of the subject matter disclosed herein, including but not limited to all that comes within the scope and spirit of the following claims.

Claims (10)

1. An anti-extension anti-stretching high-performance industrial filter cloth is characterized by comprising:

surface weft yarns for forming the surface layer of the filter cloth;

an inner weft for forming an inner layer of the filter cloth;

middle layer weft yarns for forming the middle layer of the filter cloth;

warp yarns are interwoven with the surface weft yarns, the middle weft yarns and the inner weft yarns respectively according to a set weaving rule to form the surface layer of the filter cloth, the middle layer of the filter cloth and the inner layer of the filter cloth;

the warps shuttle back and forth among the filter cloth surface layer, the filter cloth middle layer and the filter cloth inner layer, and are mutually crossed and interchanged at the connection part of the filter cloth middle layer and the filter cloth surface layer and the connection part of the filter cloth inner layer, and are mutually crossed and interchanged at the interval part of the filter cloth middle layer, so that the space between the filter cloth surface layer and the filter cloth inner layer is divided into a plurality of tubular channels for inserting filtering parts; wherein, each warp yarn is used as a cycle to shuttle according to the sequence of the surface layer, the middle layer, the inner layer and the middle layer according to the respective initial position;

a filter element disposed within the tubular passage;

a connecting member for connecting adjacent two filter elements; wherein, the connecting piece includes: the filter comprises a first lantern ring sleeved on one filter component, a second lantern ring sleeved on an adjacent filter component, and a connecting shaft for connecting the first lantern ring and the second lantern ring;

the outer sides of the first lantern ring and the second lantern ring are provided with annular grooves which are formed by sinking towards the inner side and used for clamping and connecting the connecting shaft; the connecting shaft is provided with a clamping groove which is clamped and connected with the inner wall of the annular groove; a rotating shaft hole for inserting the connecting piece is formed in the annular groove; and a rotating shaft inserted into the rotating shaft hole is arranged at the tail part of the connecting shaft.

2. The stretch-resistant, high performance industrial filter cloth of claim 1, wherein at least some of the warp and weft yarns are a first yarn for stretch resistance and a second yarn for stretch resistance, respectively; wherein the first yarns have an initial modulus that is less than the initial modulus of the second yarns; the elongation at break of the first yarn is greater than the elongation at break of the second yarn; wherein the first yarn has a resiliency of greater than 85% at three percent constant elongation; the second yarn has an initial modulus greater than 6N/tex; the second yarn has a breaking strength greater than 0.5N/tex.

3. The stretch-resistant, high performance industrial filter cloth of claim 2, wherein the first yarn comprises any one of polybutylene terephthalate fiber (PBT), poly (1, 3-trimethylene terephthalate) fiber (PTT), polyurethane fiber (PU), polyethylene terephthalate fiber (PET), or a combination thereof; the second yarn comprises: any one or the combination of carbon fiber CF, polyethylene terephthalate fiber PET, poly-p-phenylene terephthamide fiber PPTA, ultra-high molecular weight polyethylene fiber UHMWPE and polyamide fiber PA.

4. The industrial filter cloth with the characteristics of extension resistance, tensile resistance and high performance as claimed in claim 1, wherein the covering coefficients of the surface layer of the filter cloth, the inner layer of the filter cloth and the middle layer of the filter cloth are 1600-2700; at least one of the warp yarns and the weft yarns comprises: a fiber yarn composed of a plurality of profile fibers; the cross section of the profiled fiber is in any one or combination of a triangle, a Y-shaped, a pentagon, a trilobal, a quadralobal, a pentalobal and a fan shape.

5. The stretch-resistant, high performance industrial filter cloth according to any one of claims 1 to 4, wherein the intermediate layer is of a double or more layer spacer construction.

6. The industrial filter cloth with the characteristics of extension resistance, tensile resistance and high performance as claimed in claim 5, wherein the first lantern ring and the second lantern ring are both provided with through holes for sleeving a filtering component, and flexible components which are annularly arranged in the through holes and are used for being in close contact with the filtering component; and the size of the through hole is gradually increased from the outer side to the inner side where the filter component is sleeved.

7. The stretch-resistant, high performance industrial filter cloth of claim 6, wherein the connector further comprises: the two opposite ends of the tension spring are respectively connected with the first sleeve ring or the second sleeve ring and sleeved on the filter part; the first and second collars are magnetic.

8. The stretch-resistant, high performance industrial filter cloth of claim 1, wherein the filter pores in the filter cloth have a pore size of less than 5um of greater than 80%; the air permeability of the stretch-proof high-performance industrial filter cloth is 10-30 mm/s under the pressure of 125 Pa.

9. The stretch-resistant, stretch-resistant and high-performance industrial filter cloth according to claim 1, wherein the width of the tubular channel is between 1 and 10 cm; and the materials of the filtering components arranged in the tubular channels in the two adjacent layers are different.

10. A method of making a stretch-resistant, stretch-resistant high performance industrial filter cloth according to any one of claims 1 to 9.

Images