Some standard content:
GB/T17492--1998
This standard is equivalent to ISO9044:1990 "Industrial Wire Mesh-Technical Requirements and Inspection". This standard is consistent with ISO9044 in terms of main technical content, but according to my country's national conditions, the following two modifications are made: 1) Figure 5 in ISO9044 is modified, and "Figure 6 Reading microscope for measuring mesh size less than 1mLm" is added. 2) The last paragraph in 5.1 is deleted. This standard was proposed by the Ministry of Machinery Industry of the People's Republic of China. This standard is approved by the National Technical Committee for Standardization of Screen Screening and Particle Sorting Methods. The drafting units of this standard are: Machinery Standardization Research Institute of the Ministry of Machinery Industry, State-owned Factory 540, and State-owned Xiajing Machinery Factory. The main drafters of this standard are Deng Yue, Song Ruxuan, and Jia Xiupo. GB/T 17492199B
ISO before
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National standard ISO 9044 was formulated by ISO/TC 24 Technical Committee on Screen Screening and Other Sorting Methods. 1 Scope
National Standard of the People's Republic of China
Industrial woven wire cloth
Technical requirements and testingCB/T 17492 — T998
eq1S0 9044:1990
This standard specifies the terms and general uses of industrial woven wire cloth for screening and filtering, and also specifies tolerances, technical requirements and inspection methods.
This standard applies to industrial metal wire woven square hole mesh, whose materials are steel, stainless steel or non-ferrous metals: it is not applicable to metal wire woven mesh plated after weaving, pre-bent and welded metal wire screens. The use of metal wire woven mesh not used for screening should be restricted because screening has other prerequisites. Different requirements can be agreed upon by the supplier and the buyer when ordering.
Cited Standards
The following standards contain clauses that, through reference in this standard, constitute the original text of this standard. At the time of publication of this standard, the versions shown are valid. All standards are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards, GB/T5330--1985 Industrial thick gold wire woven square hole screen GB/T8605--1985 Industrial mesh metal wire GB/T10611-1988 Industrial screen mesh size series 3 Definitions
This standard adopts the following definitions
3.1 Mesh size u
The distance between two adjacent warp or weft wires measured in the middle of the projection plane (see Figure 1). Figure 1 Mesh size, wire diameter and hole spacing
3.2 Wire diameter
The true diameter of the wire on the wire screen,
Note: The wire diameter may change slightly during the weaving process. 3.3 Pitch P (distance between two adjacent center lines): GB/T 17492-1998) nominally the sum of the hole size and the wire diameter (see Figure 1). 3.4 Warp All longitudinal wires in the weaving process. 3.5 Weft All transverse wires in the weaving process. 3.6 Number of holes per unit length The number of holes counted in a row on a given unit length. Note: The number of holes in a 25.4 mm long mesh is also called the "hanging mark" and is no longer used. 3.7 Open area percentage A.
9) The percentage of all mesh areas to the screening area on the entire screening surface + b) The ratio of the square of the basic size of the mesh to the square of the basic hole spacing = (+ d), rounded to an integer percentage value: 3.8 Weaving type
The way the warp and weft are interwoven.
(+ × 100%
Note: Industrial wire mesh is woven with plain or twill to form square holes (Map 2). D
) Plain weave group
b) Twill weave
Figure 2 Weaving type
3.9 Stability of wire mesh
The stability of the interweaving of the warp and weft of the wire mesh depends on the interweaving tension and connection strength between the warp and weft: it is affected by the tensile strength of the material, the ratio to d and the weaving type. 3.10 The mass per unit area Pn
is calculated using the following formula:
618.1(w + d)
wherein; d is the wire diameter, mm
mesh size, mm
p is the material density, kg/m.
Formula (2) gives the mass per unit area, and the actual value is allowed to be 3% lower. Note: Typical values of β for various materials can be found in the relevant material manual. For example, the mass basis per unit area of carbon steel with a density of 7850 kg/m\ can be calculated using formula (2), as follows: 12.7
7 850 3
618. 1(w +d) — + d
Taking carbon steel wire mesh as an example (e=7850 kg/m*), when the hole spacing p and the mass basis per unit area pA are known, the wire diameter d can also be calculated using formula (2), see formula (3);
3.11 Mesh block
GB/T 17492 — 1998
Wire mesh cut from a roll with a specified side length, angle or radius. 3.12 Mesh strip
Wire mesh cut from the length and width of a standard mesh roll with a specified width. 3.13 Major defects
Machining defects that significantly affect the mesh size or surface quality of the wire mesh. 3.13.1 Holes
Comprehensive destruction of the weave pattern caused by mechanical damage during the weaving process, constituting a major defect. 3.13.2 Half-cut weft (weft)
Major defect caused by one or more wefts of insufficient width woven into the mesh. 3.13.3 Sparse
Wire mesh-Major defect caused by uneven wefts over a length of the mesh. 3.13.4 Skipped
Major defect caused by wefts that are not interwoven over a length of the mesh. 3.13.5 Loose warps
Major defect caused by warps that are longer than the adjacent warps. 3.13.6 Loose wefts
Major defect caused by wefts that are longer than the adjacent wefts. 3.13.7 Rip
Major defect caused by tears of unequal lengths in the mesh. Note: Rip generally occurs near the edge. 3.13.8 Warp thinning
The main defect caused by a single mesh that is too wide in the warp direction. 3.13.9 Weft thinning
The main defect caused by a row of meshes that are too wide in the weft direction. 4 Technical requirements
4.1 General
The technical requirements for the mesh size, wire diameter, mesh size and wire diameter combination of industrial metal wire woven meshes should refer to GB/T 10611, GH/T 8605 and GB/T 5330. 42 Tolerance of mesh size
The calculation of mesh size tolerance is shown in formula (4) to formula (6). Note: In formula (4) to formula (6), the units of X., Y., z. and \ are μm. The subscript symbol \,\ represents various industrial metal wire meshes\. 4.2.1 The deviation of mesh size from the basic size should not exceed the value of X. X, is the maximum permissible deviation of a single mesh measured in one direction (warp or weft) and can be calculated using the following formula: [2reo r5
where:, is the maximum value when =.
A mesh exceeding the value of X, is considered a major defect (see 3.13.8 and 3.13.9). .(4)
4.2.2Y, is the limit deviation of the arithmetic mean of the mesh sizes measured and calculated in the warp or weft direction. The arithmetic mean of the actual mesh size
4.2.3Z. is the dictionary mean of X. and Y. GB/T 17492
*+ 1. 61× 1.5
4.2.4 The number of meshes with mesh sizes between "+X,\ and \w+Z. should not exceed 6% of the total number of meshes.+++++
According to experience, since the negative deviation of a single mesh size does not affect the screening process, 2,and X, values have only positive deviations. The mesh size tolerance values are shown in Table 1 and the diagram is shown in Figure 3. Table 1 Mesh size tolerances
Basic mesh size
Mesh size tolerances of metal wire mesh made of the following materials Stainless steel or non-ferrous metal (except copper and aluminum) +X/w
Steel, copper or aluminum
+++++++( 6)
4.3 Permissible number of weaving defects
GB/T17492
2—1998
Basic mesh size w
Figure 3 Diagram of arrangement of X,,Y. and Z.
w+z, e+x,
4.3.1 Commercially produced metal wire mesh cannot be free of weaving defects. The supplier and the buyer must reach an agreement on the nature and number of major defects allowed per unit area of the metal kitchen wire mesh. The percentage of the metal wire mesh yield rate shall be agreed upon by the purchaser and shall vary according to the size of the metal wire mesh block. 3.2 Unless otherwise agreed upon by the purchaser and the supplier, the number of major weaving defects allowed is shown in Table 2. Table 2 Allowable number of major defects
Basic size of mesh extension,
0. 25≤1
0. 125≤w 0. 25
0.D63≤w0.125
Maximum number of major defects per 10m
4.3.3 The allowable number of mesh block weaving defects and their locations shall be agreed upon by the purchaser. Otherwise, the allowable number of mesh block weaving defects shall comply with the provisions of Table 2.
4.3.4 Unless otherwise specified, minor defects that do not produce oversized mesh holes or significantly affect the surface quality of the metal wire screen shall be considered acceptable.
4.4 Cutting tolerance of mesh
The size and deviation of the mesh shall be specified. Unless otherwise agreed, a cutting tolerance of ±0.5% shall be allowed, and at least a deviation of the hole distance (force = +) length shall be allowed. Note: If the mesh of the wire mesh is required to be at right angles, it is possible to cut along the warp and/or weft, and the wires at the reverse edge may be separated from the two. 4.5 Flatness of woven wire mesh
Woven wire mesh may curl in the direction of the warp and/or weft, because it is not possible to ensure that the wire mesh is absolutely flat. 4.6 Surface condition
Due to the weaving process, the woven wire mesh may be covered with a layer of oil film. GB/T 17492 1998
The surface may have traces of wire drawing and/or weaving processing. Note: Generally speaking, there is a difference in the curvature of the warp and weft. 4.7 Materials
The purchaser shall select the materials, which are related to the following conditions: 8) the final use of the wire mesh, such as environmental corrosion protection, food industry, etc., b) further processing, such as molding, welding and surface treatment. The materials shall be marked according to the relevant standards. If there is no standard, the marking shall be based on the relevant commercial technical regulations. 5 Inspection
5.1 General
Inspection shall be carried out on the principle of being able to detect defects or deviations of the wire mesh with the least number of items. The wire mesh shall be inspected according to the following procedures and steps: and) weaving defects and damage;
h) maximum deviation of mesh size;
c) mean value of mesh size;
d) wire diameter.
5. 2 Inspection device
The inspection device for measuring mesh size and wire diameter shall be adapted to the tolerance to be measured. 5.3 Determination of mesh size
The inspection device for measuring mesh size is shown in Figures 4 to 6. When measuring mesh size less than 1 mm, a reading microscope or a projector can be used. Figure 4 Small caliper for measuring mesh size greater than 4 mm Figure 5 Magnifying glass for measuring mesh size greater than 1 mm 5.3.1X: Maximum single value
GB/T 17492— 1998
Figure 6 Reading microscope for measuring mesh size less than 1 mm When calculating the inspection results, the side width of 10 mm on both sides is not taken into account. For mesh size greater than 5 mm, the side width equivalent to two meshes on each side is not taken into account.
Note: Meshes that are too large in the warp direction and deviate from the basic value by about 10% ("warp thinness", see 3.13.8) can be measured directly on the light-transmitting plate without optical instruments.
5,3.2X: Arithmetic mean
5.3.2.1 General
The arithmetic mean of the mesh size should be measured in the warp and weft directions respectively. In order to obtain a representative value, it is necessary to measure the number of meshes specified in Table 3 or below.
5.3.2.2 When measuring the mesh size in the warp direction of a metal wire mesh with a mesh size of less than or equal to 0.5 mm, measure according to the number of rows and the number of meshes per row specified in Table 3. Note that rows cannot be repeated. Since there is no specification in Table 3 The distance between the rows is fixed, so 2% of the mesh can also be tested. For rolled metal woven mesh, generally speaking, a strip of mesh block with the entire width should be tested. In order to check the uniformity of the mesh in the weft direction, it is recommended to test 5 roughly equidistant rows of holes for each roll of mesh. On short sections and mesh blocks, 5 measuring rows of holes should also be tested, with 10 mesh holes in each row. 5.3.2.3 For metal woven mesh with mesh size greater than 0.5mm, 5 roughly equidistant rows of 10 mesh holes in each row should be tested in the whole roll. All sizes of the mesh in the warp and weft directions are tested in this way. The same is true for short sections and mesh blocks. Table 3 The number of mesh rows and mesh numbers required to measure the mesh in the warp direction 1
Basic size of mesh
0. 25w≤0.5
0.125w0.25
0.063w0.125
Number of tested columns
Number of mesh holes per ten tested columns
Approximate number of mesh holes per length of 1
Between 1000 and 2500
Between 2500 and 4000
Between 4000 and 10000
Between 10000 and 20000
GB/T 17492—1998
Use one of the following methods to determine the wire diameter after weaving: a) measure the wire untied from the wire heald net (see Figure 7); b) if there is enough protrusion, use the measuring instrument to directly measure the base wire on the tree;) calculate it by the formula of unit area density [Formula (3); d) use the optical projection method.
(.25mm0 002mm
Figure? Example of a method for measuring wire diameter
5.5 Rapid test method
5.5.1 Principle
This method is used to determine the number of hole spacings within a given length. The principle is to divide the given length by the number of hole spacings to obtain the average hole spacing, and subtract the wire diameter from the average hole spacing to obtain the average mesh size. 5.5.2 Fixed length measurement method
This measurement method should be used preferentially for mesh sizes less than 1mm. At a given length, divide this length by the basic hole spacing (+d) to determine the basic number of mesh holes. Then count the actual number of mesh holes at this given length. The allowable deviation of the actual number of mesh holes relative to the basic number of mesh holes is given in the third column of Table 4. When measuring mesh sizes less than 1m, the device shown in Figure 6 should be used preferentially. Table 4 only gives the approximate value of Y, and its exact value is shown in Table 1Table 4 Deviation of the number of meshes measured by the rapid detection method
Basic mesh size α
0. 25,0. 5bzxz.net
0. 125-0. 25
0. 063-0, 125
0. 032-0. 063
5.5.3 Fixed number length measurement method
Number of meshes
Per 1 mm length
80≤n167
#≥167
Per 25. 4 mm Length
25≤50
50n4100
100≤-200
200≤425
Non-material Deviation of the number of holes in metal wire woven steel mesh Stainless steel or non-ferrous metal thickness
(Except copper and lead)
Steel, copper or aluminum
For wire mesh with a mesh size of 1 to 16 mm, count 10 hole spacings; for smaller mesh sizes of 0.1 to 1 mm, count 20 hole spacings, measure the corresponding length, and then measure the wire diameter using the method specified in Article 5.4. Example (see Figure 8):
Number of hole pitches on the measured length n=10, the length of the measured hole array L=52.5 mm,
Wire diameter d=1.25 mm,
Thus the mesh size
CB/T 17492-1998
—d-52.5
5-1.25=4 mm
Therefore, the average mesh size of the wire mesh is 4 m. cm1
Figure 810 hole pitch measured hole array is 52.5 mm length 5.6 Inspection Certificate
When placing an order, the purchaser may request an inspection certificate, which shall include the following information or part thereof: a) Chemical analysis of the braided wire, i.e. chemical analysis of the material: preferably analysis of the wire drawing manufacturer or wire processing batch or melting number; b) Basic mesh size w of the metal wire braided mesh and diameter d of the metal wire used for braiding. Any additional inspection requirements shall be agreed upon by both the supplier and the purchaser. 6 Delivery
6.1 Coiled mesh
6. 1. 1 Standard mesh rolls shall be 25 m or 30.5 m long. The mesh roll length may have a tolerance of ±10%. The delivery length shall be consistent with the length stated on the bill of lading.
6.1.2 Coiled metal wire braided mesh may consist of a maximum of three sections of mesh, and the minimum length of each section shall not be less than 2.5 m. 6.1.3 For rolled mesh and loose mesh, the mesh width shall not be less than the basic width, but may exceed 2%. The total width shall also be measured. 6.2 Strips
For loose strips, the width shall be specified. If the order is for less than the standard roll, the length of the strips ordered may be reduced accordingly.
6.3 Blocks
For steel blocks cut to size, the side length, length, angle and radius shall be specified. 6.4 Edges
Unless otherwise specified, standard rolls, loose rolls or blocks of woven wire mesh may be shipped with or without edges. 7 Packaging
Wire mesh with a wire diameter of 0.28 mm or less shall be rolled on a wooden or cardboard reel of approximately 50 mm diameter; wire mesh with a wire diameter greater than 0.28 mm may be rolled without a reel. The thicker the wire, the larger the inner diameter of the roll should be. 8 Marking
GB/T 17492—1998
Wire mesh that complies with this standard shall be marked with the following information: a) name and trademark of the manufacturer;
b) material of the wire;
c) basic size of the mesh:
d) basic diameter of the wire;
e) if it is not plain weave, the weaving type shall be marked:
length and width of standard mesh roll or strip, or size and number of mesh blocks; g) if the agreement stipulates, the quality shall be marked.
If the mesh roll consists of 4 segments, the length of each segment shall be marked. Wire mesh strips or blocks shall be marked on the outer packaging. The length and quality of each rolled mesh tea (mesh roll) shall be stipulated according to the agreement.
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