Introduction to types, applications and standards of stainless steel mesh
2024-06-20 16:15:09
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There are many types of stainless steel grades, including austenite, ferrite, martensite and duplex stainless steel. Since austenite has the best comprehensive performance, is non-magnetic and has high toughness and plasticity, austenitic stainless steel is the best stainless steel wire for wire mesh processing. Austenitic stainless steel has grades such as 302 (1Cr8Ni9), 304 (0Cr18Ni9), 304L (00Cr19Ni10), 316 (0Cr17Ni12Mo2), 316L (00Cr17Ni14Mo2), and 321 (0Cr18Ni9Ti). From the content of chromium (Cr), nickel (Ni), and molybdenum (Mo), 304 and 304L wires have good comprehensive performance and corrosion resistance, and are currently the most used wires for stainless steel mesh; 316 and 316L contain high nickel and molybdenum, which are most suitable for drawing fine wires, and have good corrosion resistance and high temperature resistance. They are the best choice for high-mesh dense mesh.
In addition, friends who do wire mesh processing need to be reminded that stainless steel wire has a time effect. After it has been placed at room temperature for a period of time, the processing deformation stress is reduced. Therefore, stainless steel wire that has been placed for a period of time is better for making woven mesh.
Since stainless steel mesh is acid-resistant, alkali-resistant, high-temperature-resistant, tensile-resistant and wear-resistant, it is particularly suitable for screening and filtering under acidic and alkaline environmental conditions, such as mud mesh in the petroleum industry, filter mesh in the chemical and chemical fiber industry, pickling mesh in the electroplating industry, and for gas and liquid filtration and other media separation in metallurgy, rubber, aerospace, military, medicine, food and other industries.
Types and characteristics of stainless steel mesh
Types of stainless steel mesh: stainless steel woven mesh, stainless steel square hole mesh, stainless steel dense mesh, stainless steel wire mesh, stainless steel filter mesh, stainless steel screen mesh.
Classification of stainless steel woven mesh:
1. Stainless steel square hole mesh
(1) Specifications and definitions of square mesh: The specifications of square mesh are expressed by the basic size of the mesh and the wire diameter. For example, the square mesh with the specification of "0.15/0.1" has a mesh of 0.15mm and a wire diameter of 0.1mm. The mesh is made of radial wires and weft wires interwoven together, so it is also divided into radial mesh and weft mesh. When the radial mesh = weft mesh, it is a square mesh. When the radial mesh is larger than the weft mesh, it is called a radial long hole mesh; when the radial mesh is smaller than the weft mesh, it is called a weft long hole mesh. The diameters of the warp and weft wires of the square mesh are equal, and the warp shrinkage is generally greater than the weft shrinkage (that is, the warp wire is more curved in the mesh); the square mesh has both plain weave and twill weave.
(2) The porosity and filtration efficiency of square mesh: The porosity of square mesh refers to the percentage of the total mesh area of the metal mesh to the area of the metal mesh. The size of the porosity directly affects the screening efficiency of the screen. The screen with a large porosity has a higher screening efficiency. When the square mesh is used as a filter, it can block the minimum diameter size of most solid particles, which is called the filtration efficiency of the square mesh. The filtration efficiency of the square mesh is its mesh size.
(3) Due to the length of the article, we will not introduce the 23 main mesh defects, their causes and prevention methods of square mesh in detail today. If you are interested, you can call our hotline 7722111 and we will give you a detailed introduction.
(4) The influence of the (hole/wire) ratio of square mesh on the weaving process: From the perspective of weaving theory, the (hole/wire) ratio of square mesh should not be less than 1. It is generally difficult to weave when the (hole/wire) ratio is less than 1, and its minimum limit is 0.7. Usually, high-mesh square mesh with a weaving ratio of 1-1.5 is mostly woven with twill. However, when the ratio is greater than 1.35, especially greater than 1.5, it is advisable to use plain weave. If twill weave is used, the warp and weft wires are easily interwoven and the mesh is skewed; when the ratio is less than 1.35, it is advisable to use twill weave. If plain weave is used, a large number of warp breaks are easily generated, which greatly increases the difficulty of weaving the mesh.
(5) Characteristics and applications of square hole mesh: Characteristics: smooth surface, flexible wires, tight interweaving, precise mesh holes; uniform structure, uniform thickness, acid and alkali resistance, corrosion resistance, etc. Suitable for petroleum, chemical, rubber, metallurgy, medicine, food and other industries.
2. Stainless steel dense mesh (commonly known as mat-type mesh)
(1) Specifications and definition of dense mesh: The specifications of dense mesh are expressed as "warp mesh number x weft mesh number / warp diameter x weft diameter". Its wire diameter can be as fine as 0.02mm, and its mesh number can be as high as 2800 mesh. From the specification of dense mesh, it can be seen that its warp and weft wire diameters and warp and weft mesh numbers are different. Generally, dense mesh is made of coarse warp wires and fine weft wires interwoven, and the mesh surface presents longitudinal convex stripes; reverse dense mesh (also called contrast dense mesh) is made of fine warp wires and coarse weft wires interwoven, and the mesh surface presents transverse convex stripes. Its radial wires are more than the weft wires per unit area, and the absolute ratio of warp mesh to weft mesh is greater, so it is more difficult to weave; the key to the change between the two is that the mesh opening in a single direction can be equal to zero; this kind of mesh interweaving is dense mesh, commonly known as mat-type mesh. Dense mesh can be woven in plain or twill.
(2) Filtration of dense mesh: There are three types of filtration of dense mesh: nominal filtration, absolute filtration, and actual filtration. Nominal filtration and absolute filtration are structural parameters of dense mesh. For a certain specification, it is a fixed value. For all dense meshes, its nominal filtration is its nominal pore size, and its absolute filtration is its absolute pore size.
The actual filtration degree refers to the filtration degree under actual use conditions. It is directly affected by temperature, pressure, use time, medium viscosity, number of bending times of the filter hole, etc. Therefore, the actual filtration degree is a variable value.
The dense mesh has three layers of filter holes for filtering. The first and third layers are the filter holes on the front and back sides of the mesh. The filtered substances must first pass through the first or third layer of filter holes. We call these two layers of filter holes the first gate. The second layer of filter holes in the mesh is a cross-sectional triangular hole, which is the hole we calculate the filtration value of the dense mesh. We call it the second gate of the filter. The actual filtration value of the dense mesh is determined by the actual size of the two gates, which are generally not equal in size.
(3) Warp and weft shrinkage of dense mesh: For general dense mesh, since the warp is coarse and the weft is fine, the warp does not bend in the mesh, so there is no warp shrinkage; while the weft bends and deforms greatly in the mesh, so the weft shrinkage is also large. For reverse dense mesh, since the warp is fine and the weft is coarse, the weft does not bend in the mesh, so the warp bends and deforms greatly, so the warp shrinkage is also large. The size of the weft shrinkage of the dense mesh directly affects the weaving quality of the mesh. Dense mesh with a large weft shrinkage has a large weft clamping force and is prone to weft breakage bright spots.
(4) Characteristics and applications of dense mesh: Characteristics: high precision, precision, stable filtering performance, high load strength, high temperature resistance, high pressure resistance, corrosion resistance, etc. Suitable for aviation, aerospace, military industry, scientific research, petroleum, chemical fiber, metallurgy, medicine, food and other industries.
3. Classification of stainless steel mesh by weaving type: The weaving form of stainless steel woven mesh has developed from the simplest plain weave (two heddle) to multi-weave (5 heddle, 8 heddle or above) weaving; the mesh surface has developed from single layer to multi-layer, and there are more and more weaving forms.
1) 1/1 plain weave 2) plain dimpled weave 3) incompletely covered twill dimpled weave 4) 2/2 twill 5) 1/2 half twill 6) fully covered twill dimpled weave 7) broken twill 8) reverse plain dimpled weave 9) reverse twill dimpled weave 10) herringbone twill 11) herringbone twill 12) V-shaped twill 13) 5-harness satin 14) weft knitting 15) warp knitting 16) spiral string weave…
Here is a brief introduction to the three commonly used weaving methods:
(1) Plain weave
Plain weave is a method in which every other warp and weft yarn are interwoven up and down. It is the simplest, most common and most common weaving method.
(2) Twill weave
The characteristic of twill weaving is that the warp interlacing points or weft interlacing points continuously form a sagittal twill cycle on the mesh surface, and there must be at least 3 warp threads and 3 weft threads. These two conditions are indispensable. The twill lines that tilt from the lower right to the upper left are called left twill; the twill lines that tilt from the lower left to the upper right are called right twill.
(3) Satin weave
Satin weaving is a more complex weaving process. Its main feature is that the interlacing points are not continuous, but evenly and sparsely distributed in a loop. Its interlacing parameter R is greater than or equal to 5, that is, the number of warps or wefts in a loop of the interlacing points of the satin mesh should be at least 5, and the interlacing point flying number S (the number of interlacing points between each other is called the interlacing point flying number) and R are not integer multiples of each other and cannot have a common divisor, otherwise the distribution of the interlacing points will be uneven.
3. The inspection of stainless steel woven mesh must be carried out in accordance with the technical requirements of the national standard GB/T5330-2003, and the relevant measuring tools and testing instruments must be used correctly. The quality inspection of stainless steel square hole mesh is 100% inspection, and the sampling method is not used.
1. Inspection of stainless steel wire diameter, deviation and material quality. The surface of stainless steel wire should be smooth and bright, without longitudinal marks, burrs, rust and other defects; the wire diameter tolerance should meet the regulations and the material should meet the requirements.
2. Inspection of weaving precision. It is divided into 3 levels: first-level precision, the mesh limit deviation cannot exceed 6%; second-level precision does not exceed 9%; third-level precision does not exceed 12%; mainly the inspection of the arithmetic mean of the mesh and the inspection of the large mesh size.
3. Inspection of weaving quality. It is impossible for metal wire mesh to be free of manufacturing defects during the production process. Generally, metal wire mesh delivered in rolls is not allowed to have major defects, but a small number of important defects and a certain number of general defects are allowed.
Major defects mainly refer to:
(1) The warp and weft are not interwoven firmly. When rubbing the warp and weft threads up and down with the fingers of both hands, the warp and weft threads are obviously loose and displaced.
(2) Severe curling, mesh size greater than or equal to 0.18mm, 1m long mesh surface natural curling diameter less than 80mm; mesh size less than 0.18mm, 1m long mesh surface natural bending diameter less than 60mm, should be judged as unqualified;
(3) The mesh is seriously tilted, and the warp and weft threads on the mesh surface are not vertical by more than 4 degrees in the weaving width;
(4) Multiple creases over a large area;
(5) The radially large mesh size exceeds the tolerance;
(6) Large area density is out of tolerance;
(7) There is a large area of weft running and the mesh surface is uneven;
(8) The diameters of the warp and weft yarns are seriously out of tolerance;
(9) Holes, half-cut wefts, and large forks;
(10) Severe color unevenness over a large area and severe mechanical damage.
The main defects are:
1) Forks and holes (more than 3 broken warps); 2) Half-cut wefts (length greater than 50mm); 3) Partial unevenness of the mesh surface; 4) Sparse and dense lines; 5) Local wrinkles, creases, and ripples; 6) Slight curling; 7) Slight mesh slant; 8) Large skipped lines (length greater than 10mm); 9) Large loose lines, double lines, parallel lines (length greater than 30mm), ruffles or wavy edges.
General defects refer to: single broken wire, weft nest, back nose, small loose wire, small jumper, wrong twist, slightly uneven mesh surface, slight curling, dotted oil stains, small debris, slightly wavy edges, etc. The number of general defects cannot exceed 5 per 10 square meters.
4. Inspection of mesh width and length. The standard mesh roll length of the wire mesh is 30.5 meters, and only a positive tolerance of +0.5m is allowed, and negative tolerance is not allowed. Each roll of mesh can be composed of 1 section or up to 3 sections, and the minimum length of the smallest mesh section should be no less than 2 meters; within the mesh width of 2 meters, only a positive tolerance of +20mm is allowed, and negative tolerance is not allowed.
5. Inspection of dense mesh. Unlike square hole mesh, the inspection of mesh size between warp threads and weft density shall be measured using a steel ruler with a graduation value of 1mm or a reading microscope with a graduation value of 0.05mm and a magnification of 25 times. There shall be at least 3 measuring points, and the connecting lines between the points shall not be parallel to the warp and weft lines. The distance between the measuring points and the edge of the mesh shall not be less than 20mm; the number of large mesh holes between warp threads shall not exceed 3% of the total number of warp threads. The specifications of the dense mesh, the deviation of the mesh size between warp threads, and the density of the weft threads shall comply with the national standards. The dense mesh shall be flat and clean, and the weft threads shall be closely arranged without gaps or bright spots; there shall be no mechanical damage, creases, rust spots, etc. Introduction to categories, applications and standards
Stainless steel mesh is the most common, widely used, and largest-selling metal wire mesh on the market. What people usually refer to as stainless steel mesh is mainly stainless steel woven mesh.
1. Stainless steel knowledge:
Before talking about stainless steel woven mesh, let us first briefly introduce the relevant knowledge of stainless steel: Any steel that has high chemical stability in the air, water, seawater or various acid, alkali, salt and other aqueous solutions, and does not oxidize, rust or corrode even if placed in it for a long time, is generally called stainless steel.
Stainless steel is a large series of special steels. It plays a role that other steel types cannot replace in the chemical, petroleum, electronics, defense and other industries. At present, the most used metal woven mesh is stainless steel wire. Therefore, we need to understand the influence of several main elements in stainless steel on the performance of stainless steel:
1. Chromium (Cr) is the main factor that determines the corrosion resistance of stainless steel. Metal corrosion is divided into chemical corrosion and non-chemical corrosion. At high temperatures, metal directly reacts with oxygen in the air to form oxides (rust), which is chemical corrosion; at room temperature, this corrosion is non-chemical corrosion. Chromium can easily form a dense passivation film in an oxidizing medium. This passivation film is stable and complete, firmly combined with the base metal, completely separating the base from the medium, thereby improving the corrosion resistance of the alloy. 11% is the lowest limit of chromium content in stainless steel. Steel with a chromium content of less than 11% is generally not called stainless steel.
2． 镍（Ni）是优良的耐腐蚀材料，是在钢中形成奥氏体的主要元素。在不锈钢中加入镍后，组织发生明显的变化。镍在不锈钢中含量增多，奥氏体就会增加，不锈钢的耐腐蚀性、耐高温性、耐加工性就会增强，从而改善钢的冷加工工艺性能。所以含镍越高的不锈钢越适合拔细丝、微丝用。
3.钼（Mo）可以提高不锈钢的耐腐蚀性能。在不锈钢中加入钼，能使不锈钢表面进一步钝化，从而进一步提高不锈钢的耐腐蚀性能。钼在不锈钢中不能形成沉淀析出钼，进而提高了不锈钢的抗拉强度。
4.碳（C）在不锈钢材质中用“0”表示。一个“0”表示含碳量小于等于0.09%；“00”表示含碳量小于等于0.03%。含碳量增高会降低不锈钢的耐腐蚀性，但可提高不锈钢的硬度。
不锈钢牌号类型较多，有奥氏体、铁素体、马氏体及双相不锈钢，而由于奥氏体的综合性能最好，无磁性而且具有高韧性和塑性，所以用于丝网加工的不锈钢丝以奥氏体不锈钢为最好。奥氏体不锈钢有 302（1Cr8Ni9）、304(0Cr18Ni9)、304L(00Cr19Ni10)、316(0Cr17Ni12Mo2)、316L(00Cr17Ni14Mo2)、321(0Cr18Ni9Ti)等牌号。从铬(Cr)、镍（Ni）、钼（Mo）的含量看，304、304L线材具有良好的综合性能及抗腐蚀性能，是目前不锈钢网用量最多的线材；316和316L含镍高，且含钼，最适合微细丝的拉拔，并且具有良好的耐腐蚀性和耐高温性，高目数密纹网非她莫属。
另外，需要提醒丝网加工朋友的是，不锈钢丝具有时间效应，它在常温下放置一段时间后，加工变形应力有所减少，所以放置一段时间后的不锈钢丝做编织网更好用。
由于不锈钢网具有耐酸、耐碱、耐高温、抗拉力和耐磨性强等特性。所以特别适用于酸、碱环境条件下筛分和过滤。如石油工业作泥浆网、化工化纤工业作筛滤网、电镀工业作酸洗网，以及冶金、橡胶、航天、军工、医药、食品等行业，气体、液体过滤和其它介质分离用。
二、不锈钢网的种类及特性介绍
不锈钢网种类：不锈钢编织网、不锈钢方孔网、不锈钢密纹网、不锈钢丝网、不锈钢过滤网、不锈钢筛网。
不锈钢编织网的分类：
1、不锈钢方孔网
（1）方孔网的规格及定义： 方孔网的规格是用网孔基本尺寸和丝径来表示。例如规格为“0.15/0.1”的方孔网，网孔为0.15mm丝径是0.1mm.。网孔是由径向丝和纬向丝交织而成，因此也分径向网孔和纬向网孔，当径向网孔=纬向网孔时即为方孔网。当径向网孔大于纬向网孔时，称之为径向长孔网；径向网孔小于纬向网孔时，称之为纬向长孔网。方孔网经纬丝直径相等，一般经缩率大于纬缩率（即经丝在网内的弯曲大）；方孔网既有平纹编织，也有斜纹编织。
（2）方孔网的开孔率和过滤度：方孔网的开孔率是指金属网的网孔总面积占金属网面积的百分率。开孔率的大小直接影响到筛网的筛分效率，开孔率大的筛网，筛分率较高。当方孔网作为滤网使用时，它能挡住绝大多数固体颗粒的最小直径尺寸，称为该方孔网的过滤度。方孔网的过滤度是它的网孔尺寸。
（3）方孔网的23种主要网病、产生原因及防止方法，由于篇幅较长今天就不详细介绍了，观众如果感兴趣，可拨打我们的热线电话7722111，我们再作详细介绍。
（4）方孔网（孔/丝）比值对编织工艺的影响：方孔网网孔从编织理论角度上看，其（孔/丝）比值不应小于1，（孔/丝 ）比值小于1时一般很难编织，其最小极限值为0.7。通常编织比值为1—1.5的高目数方孔网，多采用斜纹编织。但是，当比值大于1.35时，特别是大于1.5时，宜采用平纹编织，若采用斜纹编织，经纬丝容易交织不紧而产生网斜；当比值小于1.35时，宜采用斜纹编织，若采用平纹编织，易产生大量断经，大大增加织网的难度。
（5）方孔网的特点和应用： 特点：网面平滑、网丝屈弯等、交织紧密、网孔精确；结构统一、厚度均匀、抗酸碱、耐腐蚀等。适用于石油、化工、橡胶、冶金、医药、食品等行业。
2、不锈钢密纹网（俗称席型网）
（1）密纹网的规格及定义：密纹网规格是用“经目数x纬目数/经直径x纬直径”表示，其丝径可细至0.02mm，其目数可高达2800目。从密纹网的规格表示可以看出，其经纬丝直径和经纬目数是不同的，一般密纹网是粗经丝和细纬丝相交织，网面呈现纵凸条纹；反向密纹网（也叫反差密纹网）是细经丝和粗纬丝相交织，网面呈现横凸条纹，它的径向丝比纬向丝在单位面积内根数多，经目和纬目的绝对比值更大，因此编织难度也更大；这两者变化的关键是单独一个方向的网孔可等于零；这种网面交织就是密纹网，俗称席型网。密纹网可平纹编织，也可斜纹编织。
（2） 密纹网的过滤度：密纹网的过滤度有三种：名义过滤度、绝对过滤度、实际过滤度。名义过滤度和绝对过滤度是密纹网的结构参数，对于一定规格来说，它是一个固定值。所有密纹网，它的名义过滤度也就是它的名义孔径尺寸，绝对过滤度就是它的绝对孔径尺寸。
实际过滤度，是指在实际使用条件下的过滤度。它受温度、压力、使用时间、介质的黏度、滤孔的弯曲次数等条件的直接影响。因此，实际过滤度是一个可变值。
密纹网起过滤作用的有三层滤孔。第一层和第三层为网子正反面表层滤孔，被过滤物质必须先通过第一层或第三层滤孔，我们把这两层滤孔称为第一道门。网子的第二层滤孔为横剖面三角形孔，就是我们计算密纹网过滤度值的那个孔，我们称为滤网的第二道门。密纹网的实际过滤度值，由这两道门的实际大小来决定，这两道门的大小一般是不等的。
（3）密纹网的经缩和纬缩：一般密纹网，由于经丝粗纬丝细，经丝在网内不弯曲，故没有经缩率；而纬丝在网内弯曲变形大，纬缩率也大。反向密纹网由于经丝细纬丝粗，纬丝在网内不弯曲，经丝弯曲变形大，故经缩率也大。密纹网纬缩率的大小，直接影响网子的编织质量。纬缩率很大的密纹网，卡纬力也很大，容易出现纬丝断裂性亮点。
（4）密纹网的特点和应用： 特点：具有高精度、精密细致、过滤性能稳定、负荷强度高、耐高温、高压、耐腐蚀等性能。 适用于航空、航天、军工、科研及石油、化纤、冶金、医药、食品等行业。
3、不锈钢网按编织型式分类： 不锈钢编织网的编织形式由最简单的平纹（两综）编织，发展到多纹（5综、8综以上）编织；网面由单层发展到多层，编织形式也越来越多。
1）1/1平纹网 2）平纹密纹网 3）经不全包斜纹密纹网4）2/2斜纹网 5）1/2半斜纹网 6）经全包斜纹密纹网 7）破斜纹网 8）反向平纹密纹网 9）反向斜纹密纹网 10）人字形斜纹网 11）山字形斜纹网 12）V字形斜纹网 13）5综缎纹网 14）纬编法套网 15）经编法套网 16）螺旋形串条编织网……
下面简单介绍一下常用的三种编织方法：
（1）平纹编织
平纹编织是经纬丝每隔一根就上下相互交织一次，即经纬丝一上一下交织方式，是最简单、最普通和最为常见的编织方法。
（2）斜纹编织
斜纹编织的特征是经交织点或纬交织点在网面上连续构成矢向斜纹循环，至少要有3根经丝和3根纬丝，这两个条件缺一不可。斜纹纹路自右下方向左上方倾斜的，称为左斜纹；斜纹线条自左下方向右上方倾斜的，称为右斜纹。
（3）缎纹编织
缎纹编织是较复杂的一种编织工艺，它的主要特点是交织点并非连续，而是均匀稀疏地分布在一个循环组织内。其交织参数R大于等于5，即缎纹网的交织点的一个组织循环的经丝或纬丝至少应为5根，并且交织点飞数S (相隔的交织点数称为交织点飞数)与R的数值互不为整倍数，不能有公约数，否则交织点的分布不均匀。
三、不锈钢编织网的检验须按照国家标准GB/T5330—2003的技术要求进行，正确使用有关量具和测试仪器。不锈钢方孔网的质量检验是100%检验，不采用抽检方法。
1、不锈钢丝直径及偏差、材料材质的检验。不锈钢丝表面应光滑明亮，不得有纵向拉痕、毛刺、锈蚀等疵点；丝径公差应符合规定，材质符合要求。
2、编织精度的检验。分为3个等级：一级精度，网孔极限偏差不能超过6%；二级精度不超过9%；三级精度不超过12%；主要是网孔算术平均值的检验和大网孔尺寸的检验。
3、编织质量的检验。金属丝网在生产过程中不可能不存在制造缺陷，一般情况下，成卷交付的金属网，不允许存在重大缺陷，允许少量重要缺陷存在，允许一定数量的一般缺陷存在。
重大缺陷主要指：
（1） 经纬交织不牢固，用两手手指上下搓动，经纬丝有明显松动位移现象；
（2）打卷严重，网孔大于等于0.18mm，1m长网面的自然卷曲直径小于80mm;网孔小于0.18mm,1m长网面自然弯曲直径小于60mm,应判定为不合格；
（3）网斜严重，织幅宽度上网面经纬丝不垂直度大于4度；
（4）大面积多条折痕；
（5）径向间特大网孔超过公差；
（6）大面积密度超差；
（7）大面积跑纬，网面凸凹不平；
（8）经丝和纬丝直径严重超差；
（9）破洞、半截纬、较大叉口；
（10）大面积的严重色差不均匀，机械损伤严重。
主要缺陷是指：
1）叉口、破洞（3根以上断经）；2）半截纬（长度大于50mm; 3）网面部分不平； 4）稀密道； 5）局部折皱、折痕、波纹； 6）轻度打卷； 7）轻度网斜； 8）较大跳线（长度大于10mm） 9)较大松线、双线、并线（长度大于30mm）,荷叶边或波浪边。
一般缺陷是指：如单根断丝、窝纬、回鼻、小松线、小跳线、错绞、网面轻度不平、轻微打卷、点状油污、小杂物、轻度波浪边等。一般缺陷数量不能多于10平米5个。
4. Inspection of mesh width and length. The standard mesh roll length of the wire mesh is 30.5 meters, and only a positive tolerance of +0.5m is allowed, and negative tolerance is not allowed. Each roll of mesh can be composed of 1 section or up to 3 sections, and the minimum length of the smallest mesh section should be no less than 2 meters; within the mesh width of 2 meters, only a positive tolerance of +20mm is allowed, and negative tolerance is not allowed.
5. Inspection of dense mesh. Unlike square hole mesh, the inspection of mesh size between warp threads and weft thread density is measured using a steel ruler with a graduation value of 1mm or a reading microscope with a graduation value of 0.05mm and a magnification of 25 times. There are at least 3 measuring points, and the connecting lines between each point must not be parallel to the warp and weft lines. The distance between the measuring points and the edge of the mesh must not be less than 20mm; the number of large mesh holes between warp threads is allowed to not exceed 3% of the total number of warp threads. The specifications of the dense mesh, the deviation of the mesh size between warp threads, and the density of the weft threads should comply with the national standards. The dense mesh should be flat and clean, and the weft threads should be closely arranged without gaps or bright paths; there should be no mechanical damage, creases, rust spots, etc.
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