Some standard content:
GB/T5325--1997
This standard is revised on the basis of GB/T5325-89. The fabric scoring adopts the standard "Cotton Fabric (After Finishing) Export Inspection Standard" of Japan Textile Inspection Association, the standard "Final Defect Inspection Method" of France CRTM (Miloz Textile Research Center) and the "Polyester-Cotton Defect Appearance Inspection Standard" of Hong Kong Lianye Textile Co., Ltd. In order to facilitate implementation, the content of the standard is combined with the characteristics of polyester-cotton blended fabrics, and is as close to the cotton cloth standard as possible. The scoring method for fabric defects is changed from 4 points to 10 points. The standard level of superior products is equivalent to the international advanced level, and the first-class products are close to the international general level. In terms of the applicability of the standard, it is clearly applicable to the identification of the quality of all kinds of blending ratios of polyester content of 50% and above. As the current cloth machine is developing towards wide width, the cloth width has increased to 230cm and above. Appendix A, Appendix B, Appendix C, Appendix D, Appendix E, and Appendix F of this standard are all standard appendices. This standard shall replace GB/T532589 from the date of entry into force. This standard is proposed by China National Textile and Apparel Council.
This standard is under the jurisdiction of Shanghai Textile Standard and Metrology Institute. Drafting units of this standard: Shanghai Textile Standard and Metrology Institute, Hebei Provincial Textile and Apparel Council. 81
1 Scope
National Standard of the People's Republic of China
Combed polyester /cotton grey fabrics
Combed polyester /cotton grey fabricsGB/T5325-1997
Replaces GB/T5325-89
This standard specifies the classification, requirements, scoring of fabric defects, test methods, inspection rules and marking, and packaging of combed polyester/cotton grey fabrics.
This standard is applicable to the quality assessment of polyester/cotton blended fabrics with a polyester blending ratio of 50% or more, woven, and for clothing, excluding jacquard fabrics.
2 Cited standards
The clauses contained in the following standards constitute the clauses of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T406--93 Cotton gray cloth
GB/T3923.1--1997 Textile fabrics - Tensile properties of fabrics - Part 1: Determination of breaking strength and elongation at break - Strip method GB/T4666-1995 Determination of length of woven fabrics GB/T4667-1995 Determination of width of woven fabrics GB/T4668-1995 Determination of density of woven fabrics FZ/T10004--93 Inspection rules for cotton and chemical fiber pure and blended gray cloth FZ/T1 0006—93 Inspection of cotton and chemical fiber pure and blended grey fabrics for cotton knots, impurities, defects and grid rates FZ/T10009--1996 Marking and packaging of cotton and chemical fiber pure and blended grey fabrics ZB/TW04006.2--89 Correction method for the breaking strength of cotton and chemical fiber pure and blended products due to temperature and regain Correction method for the breaking strength of grey fabrics
3 Classification
Combed polyester-cotton blended grey fabrics are classified by variety and specification, and are formulated by the production department according to user needs. 4 Requirements
4.1 Technical requirements Items
The technical requirements for combed polyester-cotton blended grey fabrics include six items: fabric organization, width, density, breaking strength, cotton knot defect grid rate, and fabric surface defects.
4.2 Grading rules
4.2.1 The grades of combed polyester-cotton blended grey fabrics are divided into superior, first, second and third grades, and those below third grade are substandard. 4.2.2 The grade of combed polyester-cotton blended grey fabrics is based on piece. Fabric organization, width, and fabric surface defects are graded by piece, and density, breaking strength, and cotton knot defect rate are graded by criticism. The lowest grade among the six items is the grade of the piece. 4.2.3 See Table 1 and Table 2 for the grading rules.
Approved by the State Bureau of Technical Supervision on June 30, 1997, 82
Implementation on December 1, 1997
Fabric structure
Root/10cm
Breaking strength
Nep defect rate
Not more than
GB/T 5325-1997
Grading provisions in Table 1
According to design provisions
According to product specifications
According to product specifications
Calculated according to the standard calculation formula for breaking strength in Appendix F (Appendix to the standard)
Polyester fiber content, %
Total tightness of fabric,
80 and below
Above 80
When the width deviation exceeds 1.0%, the warp density deviation is -2.0%. Cloth with too narrow width or too wide width shall be packaged separately. 60 and below
Superior products
Conforms to design
Superior products
First-class products
Second-class products
Third-class products
110 and below
Above 110
～150 Below
150 and above
～190 and below
4.2.4 The length, width, and density in the warp and weft directions must be guaranteed to meet the standard requirements after being packaged. 4.2.5 Provisions for cloth surface evaluation, etc.
4.2.5.1 The total score allowed for each piece of cloth
Ａ·L
Where: A—the total score allowed for each piece of cloth, points; the number of scores allowed per meter, points;
L—the length of the piece, m.
Calculate to one decimal place and round to an integer. 4.2.5.2 If the sum of all defect scores in a piece of cloth exceeds the allowable total score, it is a downgraded product. 4.2.5.3 If the same defect or continuous score within 0.5m is 10 points, it is a downgraded product. Allowable deviation
First-class product
Conforms to the design
Second-class product
Does not meet
Design requirements
Exceeds—1. 5%
Over 1.0%
Over ~ 8. 0%
Over 8.0%
Conform to standard
190 and above
~230 and below
4.2.5.40.5m with more than half width of unnoticeable horizontal bar, double weft plus full 4 points, score 10 points for downgraded products. Not conforming to
standard provisions
Third grade products
Average score/m
230 and above
++++*+*(1)
5 Grading of fabric defects
5.1 Inspection of fabric defects
GB/T 5325—1997
5.1.1 During the inspection, the illumination brightness on the cloth surface is 400±1001x. 5.1.2 The scoring is based on the front side of the cloth. For plain weave fabrics and chevron twill fabrics, the front side is the shift print side. For twill fabrics, the left oblique side () is the front side, and for yarn fabrics, the right oblique side (\) is the front side. 5.1.3 During the inspection, the cloth should be placed flat on the workbench, and the inspector should stand beside the workbench to clearly see the For obvious defects. 5.2 The scoring of fabric defects is shown in Table 3.
Table 3 Scoring of fabric defects
Total length
Score number
Defect classification
Obvious defects in warp
Obvious defects in weft
Serious defects
Not obvious
Score of root number
Length score
More than half width as strip.
5 cm and below
5cm and below
Half width and below
More than 5 cm~20 cm
More than 5cm~20 cm
More than half width
2 When the score of serious defects is inconsistent with the score of root number and length, the score shall be strictly followed. 5.3 The maximum cumulative score in 1m is 10 points.
5.4 Defects measurement
5.4.1 Defect length is measured by the maximum length in the warp or weft direction. 5
Above 20 cm～50 cm
Above 20 cm～half width
Half width and below
Below 1 cm
Above 50 cm～100 cm
Above half width
Above half width
5 pieces and above
1cm and above
5.4.2 For defects in the warp (weft) direction, the defects within 1 cm in width in the weft (warp) direction shall be scored as strips. For defects exceeding 1 cm in width, each 1 cm shall be counted as a strip, and the defects less than 1 cm shall be counted as a strip.
5.4.3 For obvious defects and serious defects in the warp direction, if the length exceeds 1m, the excess part shall be scored again according to Table 3. 5.4.4 If there are two or more defects occurring intermittently within a line within 5 cm in the warp (weft) direction, the score will be based on the continuous length. 5.4.5 When there are two or more obvious defects in the warp (weft) direction (including the paralysis points with different names) in a line, the total amount or the separate amount shall be scored lightly according to the severity.
5.4.6 Common break or parallel (including front and back) includes separation of 1 or 2 good yarns, and separation of 3 or more good yarns, which shall not be considered as common break or parallel (twill and satin fabrics are treated as common break or parallel within a complete organization). 5.5 Explanation of defect scoring
5.5.1 Provisions for distinguishing obvious and not obvious when scoring the following defects 5.5.1.1 Sparse weft and dense weft are obvious when they are clearly seen when stacked, and not obvious when they are clearly seen in a single layer but not clearly seen when stacked. In case of dispute, they shall be distinguished by the number of points.
a) Sparse weft: It is obvious when there are less than 2 weft yarns within 1cm in the warp direction. b) Density: The weft density within 0.5cm in the warp direction is 25% or more (the weft density is 20% or more when the weft density is below 40%). 5.5.1.2 When the unobvious sparse weft and double weft are mixed together, the score is based on the obvious horizontal bar. 8
GB/T5325--1997
5.5.1.3 The tear marks that reach the standard sample are obvious, and those that do not reach the standard sample but are visible are not obvious. 5.5.1.4 The seven defects of bamboo knot, coarse warp, coarse weft, warp shrinkage, tear marks, poor correction, and oil stains are obvious when they reach the standard sample. 5.5.2 The starting point and regulations for scoring the following defects 5.5.2.1 Edge tissue and defects 1 cm away from the edge (including edge tissue) are not scored, but raw edges, dragging yarn, cat ears, concave edges, rotten edges, gapped edges, deep oil rust defects, holes and jumps scored 10 points should be scored. If the defects extend beyond 1 cm from the edge, the score should be added. For the selvedge of shuttleless woven fabric, the length of the hair on the twisted edge is stipulated to be 0.3-0.8 cm. If it exceeds the specified length, 1 point will be scored for each meter. If the twisted edge yarn does not play the role of twisting edge, 1 point will be scored for every 2 cm of warp length. The width of the woven-in selvedge on both sides does not exceed 2.5 cm. If it exceeds the specified length, 1 point will be scored for each meter. The edge defects that affect the organization are scored 1 point for every 2 cm. If there are special requirements for the edge organization, the score shall be based on the requirements. 5.5.2.2 Defects within 0.5 cm in length in the warp direction: 1 point for every 3 rotten edges; 1 point for every 3 oil rust defects, non-fading color defects, cloth flower, broken warp, and edge support defects; 1 point for every 6 loose warps, skipped yarns, sunken yarns, and star jumps (two star jumps are counted as one). 5.5.2.3 Two double wefts with a length of 1 cm in the warp direction are scored as obvious defects in the weft direction, and 1 point for a single double weft of 5 cm or more. 5.5.2.4 3 points for each yarn with a length of more than 2 cm on the surface, and 1 point for each yarn with a length of more than 3 cm on the edge (one in and one out is counted as one).
5.5.2.5 1 point for every 2 yarns with rough edges within 5 cm in the warp direction. 5.5.2.6 Each debris with a thickness of less than 0.3 cm is scored 1 point, and debris with a thickness of 0.3 cm or more and metal debris (including porcelain) is scored 10 points (measurement of debris thickness).
5.5.2.7 Each straight strip with 1 to 2 ridges in the weft direction is scored 1 point, and the warp shrinkage wave with 1 to 2 ridges is scored 1 point for half the width and less, and 3 points for more than half the width.
5.5.2.8 Flat-root linear feet are scored a maximum of 5 points. 5.5.2.9 2 strands are broken in the warp and weft directions. 5.5.2.10 Double warps, multi-strand warps, thick warps, parallel tightness, hoop tracks, wear marks, wooden stick wrinkles, needle tracks, side support eyes, hoop threading errors, wrong fibers, flower warps, and long strip shadows are scored up to the third grade.
5.5.2.11 For the double warp and single broken warp of hoop path, wrong threading, needle path, side support eye, wear mark, flower warp, long strip shadow, lotus leaf edge, wooden stick wrinkle, high-density fabric and khaki fabric, the score will be 1 point per meter.
5.5.2.12 For three or more consecutive wefts that are not obviously wrong, the score will be reduced by half. 5.5.2.13 Loose weft shrinkage will not be scored. Twisted weft shrinkage and looped weft shrinkage (2 pieces are counted as 1 piece) within 0.5m and less than 0.5cm will be scored 1 point for every 2 pieces. 5.5.2.14 Shallow oil paralysis will be reduced by half.
5.5.3 Scoring of defects in processing
5.5.3.1 Water stains and stains will not be scored.
5.5.3.2 For double warp, path, hoop path, dense path, tear marks and cloud weave in bleaching defects, the score will be reduced by half, and deep oil defects will be doubled. 5.5.3.3 The score of star jump, dense line and uneven stripe in printing shall be reduced by half. Double warp, line, wrong threading, long stripe shadow, light oil defect, single double weft, cloud weaving, slight needle line, soot yarn, flower warp, flower weft and inconspicuous wrong weft shall not be scored. 5.5.3.4 Light oil defect and oily yarn without washing oil shall not be scored. 5.5.3.5 Dark oil defect, oily yarn, soot yarn and non-fading color defect shall not be scored without washing. 5.5.3.6 Defects within 5cm of the cloth head due to processing shall not be scored (but the six defects must be cut). 5.5.4 Provisions on defect handling
5.5.4.1 The six defects of sparse lines, 0.5cm or more ripped edges, 1cm holes or rotten edges, mismatched shuttles and 2cm or more jumps must be cut off in the weaving factory.
5.5.4.2 Metal debris woven into the fabric must be removed from the fabric. 5.5.4.3 All defects that can be repaired in the weaving factory must be repaired before leaving the factory. 6 Test methods
6.1 Breaking strength determination shall be carried out in accordance with GB/T3923.1. 85
6.2 Length determination shall be carried out in accordance with GB/T4666.
6.3 Width determination shall be carried out in accordance with GB/T4667.
6.4 Density determination shall be carried out in accordance with GB/T4668.
GB/T5325—1997
6.5 Inspection of cotton knots and impurities shall be carried out in accordance with FZ/T10006. 7 Inspection rules
In accordance with FZ/T10004.
8 Marking and packaging
8.1 In accordance with FZ/T10009.
8.2 False open shear defects should be rated as 10 points or 5 points, which are difficult to repair. 86
A1 Obvious defects in warp direction
GB/T5325—1997
Appendix A
(Appendix to the standard)
Specific contents of various defects on the surface of the cloth
Slub knot, coarse warp, wrong use of yarn, wrong threading of the heald, wrong threading, wrong threading, long strip shadow, multi-strand warp, double warp, tightness of parallel line, loose warp, tight warp, hanging warp, shrinkage ripple, shrinkage square eye, broken warp, broken defect, sunken yarn, skipped yarn, star jump, cotton ball, knot, edge support defect, edge support eye, needle path, wear mark, wooden roller wrinkle, lotus leaf edge, cat ear, rotten edge, concave edge, dragging yarn, poor finishing, wrong fiber, coal ash yarn, flower warp, oil warp, oil flower yarn, oil stain, rust warp, rust stain, cloth flower, non-fading color warp, non-fading color stain, water stain, stain, starch spot. A2 Obvious defects in the weft direction
Wrong weft (including thick, thin, tight, loose), uneven strips, missing weft, double weft, hundred feet (including linear and saw-shaped), weft shrinkage (including loop weft shrinkage, twisted weft shrinkage), rough edges, cloud weaving, weaving of debris, flower weft, oil weft, rust weft, non-fading color weft. A3 Crossbar
Tears, sparse weft, dense weft.
A4 Serious defects
Hole, edge gap, flower jump, warp shrinkage wave pattern (starting from three frets), three consecutive loose warps, hanging warps (including 1~2 good yarns separated), unconnected shuttle, 10 knots in the entire 5cm width of the warp direction or edge support defects of broken yarn, continuous 1cm rotten edges, metal debris weaving, 0.3cm thick debris weaving, starch spots affecting the organization, mildew spots, and poor finishing that damages the bottom of the cloth. A5 Among the obvious defects in the warp direction and the obvious defects in the weft direction, some defects are common to these two categories, such as bamboo knots, skipped yarns, and warp shrinkage. When classifying, only the obvious defects in the warp direction are included. If these defects appear in the weft direction, they should be scored as obvious defects in the weft direction. A6 If there are general points on the cloth that are not included in the above classification, they should also be scored as long as they meet the scoring conditions. A7 Among the obvious defects in the warp direction and the obvious defects in the weft direction, some defects with the same name can be divided into obvious and not obvious according to the inspection regulations. Not obvious ones will not be scored. In case of dispute, whether the printed and dyed fabric is evaluated as an obvious defect after reasonable processing of printing and dyeing, and the bad fabric will also be evaluated accordingly. Appendix B
(Appendix to the standard)
Explanation of defect names
B1 Hole: 3 or more warp and weft yarns are broken together or the warp and weft yarns are broken alone (including those separated by 1 to 2 good yarns), and the warp and weft yarns are looped 0.3cm, the reverse side looks like a hole.
B2 Broken edge: 3 or more warp and weft yarns are broken or one warp yarn is broken in the edge structure (including 1 to 2 good yarns are separated). Two double-sided yarns are counted as one yarn, and 1 yarn is counted as one yarn if 3 or more yarns are broken continuously. B3 Jumped flowers: 3 or more warp and weft yarns are separated from each other, including the separation of complete structures. Rotten edge: Starting from the edge, one weft yarn is broken in the edge structure, and 3 or more yarns are broken in one place. B4
Poor correction: The fabric surface is scraped and fuzzy, wrinkled and uneven, the warp and weft yarns are unevenly crossed or only repaired, B6
Mold spots: Mold spots (spots) appear on the fabric after being damp. B7 Rough edge: Due to poor edge shearing or other reasons, the weft yarn is abnormally brought into the fabric (including double weft and missing weft less than 5 cm from the edge).
Knot: Knot that affects the quality of the subsequent process. B8
Weft shrinkage: weft yarn twists into the fabric or loops appear on the fabric surface (including warp loops and loose weft shrinkage three-corner). B10 Edge support defect: the edge support or the hair roller causes the yarn in the fabric to fluff or break. B11 Cotton balls: the yarn is rubbed during weaving and the fiber becomes ball-shaped. 87
Slub knot: short thick section on the yarn.
GB/T5325—1997
Star jump: 1 warp or weft yarn skips 2 to 4 yarns to form a star-shaped shape. Jumped yarn: 1 to 2 warp yarns or weft yarns skip 5 or more. Broken defect: the broken ends of the warp yarn are woven into the fabric. Drag yarn: the uncut yarn ends dragged on the fabric surface or the edge of the fabric. Sundries: flying flowers, waste silk, oil spots, leather, wood, metal (including porcelain) and other sundries are woven in. Broken warp: the warp yarn in the fabric is broken.
Sunk yarn: due to poor lifting of the reed, the warp yarn floats on the reverse side of the cloth. Wrong threading of the reed: the reed is not threaded according to the process requirements, resulting in disordered fabric. Wrong fiber: foreign fiber yarn is woven in.
Thick warp: the warp yarn with a diameter of 5 cm or more is woven into the cloth. Hanging warp: the tension of some warp yarns in the fabric is too large. Tight warp: the twist of some warp yarns is too large.
Loose warp: the tension of some warp yarns is relaxed and woven into the cloth. Tight and loose line: the tension of single yarn is uneven when twisted into ply yarn. Double warp: two warp yarns are woven in parallel in a single yarn (thread) fabric. Path: the warp direction of the fabric is unevenly striped. Wrong threading of the hoop: the hoop is not threaded according to the process requirements, resulting in uneven arrangement of the warp yarns on the cloth. Needle path: due to the poor point-pecking weft break automatic stop device, dense needle marks are caused in the warp direction. Side support eye: the side support roller causes dense puncture marks on the edge of the fabric. Warp shrinkage: Part of the warp yarn relaxes after being subjected to unexpected tension, causing the fabric surface to show blocky or strip-shaped undulations. B33
Removal marks: The traces of fuzz and smearing of the fabric surface after the fabric is removed. B34
Double weft: Two weft yarns are woven into the fabric in a shed of a single weft fabric. Weft loss: Three or more weft yarns are woven into the fabric in the shed (including continuous double weft). Soot yarn: Yarn contaminated by soot in the air (single-layer inspection shall prevail, for oil cards). B36
Dense route: The weft density is more than the process standard. Sparse weft: The weft density is less than the process standard. B39
Uneven weft: The poor weft yarn weft can be clearly distinguished from the normal yarn when stacked up. B40
Cloud weaving: The weft yarn density is alternating between sparse and dense in a regular pattern. Wrong weft: Weft yarns with a diameter of 5 cm or more, tight twist and loose twist yarns are woven into the fabric. Extra weft: Due to changes in the cotton content or old weft yarns, the fabric surface color is different, and there are 1 to 2 dividing lines. Extra warp: Due to changes in the cotton content, the fabric surface color is different. Hundred feet: 1 to 2 weft yarns are missing in a complete structure of twill or satin fabric (including multi-head hundred feet). Water stains: The traces left after the fabric is stained with water. Stains: The traces left after the fabric is stained. Wear marks: Long strips of marks formed in the warp direction of the fabric due to friction. 3 Wood wrinkles: The creases formed by three layers of fabric folded together in the warp direction. B48
Flounces: The edge of the fabric is in the shape of lotus leaves.
Pulp spots: The pulp blocks attached to the fabric surface affect the fabric structure. Fabric blooming: Colored fibers are mixed into the yarn and woven into the fabric. Wide and narrow width: The upper and lower deviations of the width exceed the standard requirements. Concave edge: recessed into the edge of the fabric by 0.5cm or more.
Cat ears: protruding from the edge of the fabric by 0.5cm or more. B54
GB/T 5325—1997
B55 Sparse yarn: weft yarn density is less than 5 yarns per 1cm. Appendix C
(Standard Appendix)
Correction for rapid determination of fabric breaking strength In routine tests and factory internal quality control inspections, rapid tests can be carried out under normal atmospheric conditions, and then converted to standard temperature and regain for correction, but the temperature and humidity at the inspection site must be kept stable. C1 Breaking strength correction formula
Corrected breaking strength (N) = measured breaking strength (N) × strength correction coefficient.........( Cl )
c2 The correction coefficient for the breaking strength of combed polyester-cotton blended (polyester blending ratio is 50% or more) natural color fabric shall be implemented in accordance with ZB/TW04006.2.
Appendix D
(Appendix to the standard)
Inspection regulations
D1 During routine tests and factory internal quality control tests, rapid tests can be carried out under normal atmospheric conditions. D2 Batch regulations
D2.1 The production and storage quantity of one shift or one stack of three shifts in the same variety finishing workshop is considered as one batch. If one shift is considered as one batch, if there is a single shift, it will be incorporated into the calculation of the adjacent batch; if there are two shifts, the two shifts will be considered as one batch. D2.2 If the storage quantity of one stack of three shifts is less than 300 pieces, it can be accumulated to 300 pieces, but if the accumulation in one week is still less than 300 pieces, it must be considered as one batch per week (this limit does not apply when the variety is changed). D2.3 Once the batch timing point is determined, it shall not be changed after sampling. D3 Physical indicators and cotton nep inspection of polyester-cotton fabrics shall be carried out in batches, and the evaluation shall be carried out according to the evaluation results. D4 Physical indicators and cotton nep inspection shall be based on the evaluation results of one inspection. D5 If the warp and weft density do not meet the specifications due to the wrong hoop number or weft density gear of individual machines, the cloth produced by the individual machine can be removed and downgraded if it can be clearly divided. The batch of cloth should be resampled for inspection and grading. If it is not clearly divided and exceeds the allowable tolerance range, the whole batch should be downgraded. D6 Inspection cycle
Physical indicators and cotton knots should be inspected once for each batch. When the quality is stable, the inspection cycle can be extended, but at least once a week. In case of large changes in raw materials and processes or physical indicators and cotton knots are downgraded, batch by batch inspection should be carried out immediately until there is no downgrade for three consecutive batches, and then the original inspection cycle can be restored.
D7 Sampling quantity
Inspection fabric samples should be randomly sampled from each batch of polyester-cotton natural fabric after finishing and before packaging. The sampling quantity should not be less than 0.5% of the total number of pieces and should not be less than 3 pieces.
D8 Test method
D8.1 For length test of polyester-cotton fabric, take the folded fabric, with each fold equal to 1m. First measure the fold width, then count the number of folds, and use a steel ruler to measure the actual length of the remaining part less than 1m, accurate to 0.01m (based on the side designated by the inspector). The part less than 0.01m will not be counted. Calculation formula:
Piece length or section length = actual fold length × number of folds + actual length less than 1m.........( D1 )
The fold length should be measured by spreading the cloth flat on a platform. Use a steel ruler to evenly measure the upper and lower pages (5-10cm from the edge) of 5 folds (double for connected pieces of cloth) within 5m from the head and tail of the cloth. The arithmetic mean of the 10 measured numbers shall be taken as the actual fold length of the cloth. The measurement shall be accurate to 0.1cm and the average number shall be calculated accurate to 0.01cm, rounded to 0.1cm. D8.2 The width of polyester-cotton fabric should be inspected by piece. Use the folded fabric, spread it flat on the platform, and measure 5 places evenly with a steel ruler, but not less than 2m from the head and tail of the fabric. The arithmetic mean of the measured numbers is taken as the average width of the fabric. The calculation is accurate to 0.01cm and rounded to 0.1 cm.
D8.3 The density of polyester-cotton fabric should be inspected by batch. The density is generally inspected by using a density mirror in the middle of the fabric (not less than 5m from the head and tail of the fabric). Generally, the number of warp or weft yarns within 5cm can be inspected, and the result is multiplied by 2. When the density is less than 100 yarns, the density should still be inspected within 10 cm. The warp density must be inspected at five different positions in the same weft direction on the whole width of each piece (two of which should be 5cm away from the edge of the fabric), and the weft density must be inspected at five different positions on each piece. For widths of 110cm and below, the warp density can be inspected 3 times for each piece and the weft density can be inspected 4 times for each piece, and then the arithmetic mean can be calculated respectively. When counting the number of warp or weft yarns, the number must be accurate to 0.5 yarns. The starting point of the count is the middle of the gap between two yarns. If the count reaches the center of the yarn, the last yarn is counted as 0.5 yarns. Any yarn less than 0.5 yarns is counted as 0.25 yarns. Any yarn more than 0.5 yarns but less than 1 yarn is counted as 0.75 yarns. The density is calculated accurately to 0.01 yarns and then rounded to 0.1. When measuring the warp density, the fabric width must be measured at the same time, and the number must be recorded accurately to 0.1cm.
Appendix E
(Appendix to the standard)
Regulations on false cutting and splicing rate
E1 If the user allows false cutting or splicing, false cutting and splicing can be implemented. E2 The total false cutting and splicing rate shall not exceed 25%, of which the splicing rate shall not exceed 10%. Appendix F
Appendix to the standard)
Regulations on the formulation of technical conditions for polyester-cotton blended grey fabrics. Except for the following provisions, the formulation of technical conditions for polyester-cotton blended grey fabrics shall be carried out in accordance with the provisions of Appendix F of GB/T406-1993. F1 The nominal tex number (tex) and standard dry weight (g/100 m) of polyester-cotton blended grey yarn are calculated according to different regains and different blending ratios.
F1.1 Tex number of polyester-cotton blended yarn
Tex number of polyester-cotton blended yarn (tex) =
Where: N. Imperial count of polyester-cotton blended yarn, W. Metric standard moisture regain of polyester-cotton blended yarn, %, W. --- Imperial standard moisture regain of polyester-cotton blended yarn, %. F1.2 Standard dry weight of 100m polyester-cotton blended yarn mc590.5×
Where: m. Standard dry weight of yarn, g; T. Nominal Tex number of yarn, tex,
W. Standard moisture regain of yarn, %.
（F1）
·（F2）
Example: Calculation of the tex number (T) and the metric standard moisture regain (W.) and the imperial standard moisture regain (W.) of 65/35 polyester-cotton blended yarn: W. = 0.4%× 65 + 8.5%× 35 = 3.2%100
0.4% × 65 + 9.89% × 35
GB/T 5325-1997
100 + 3.72%
F2 Establishment of breaking strength standard for polyester-cotton blended grey fabricF2.1 Calculation of breaking strength standard
F2.1.1 The breaking strength of the fabric is expressed as the breaking strength (N) of a 5×20 cm strip. F2.1.2 Breaking strength calculation formula
P.·N·K·T
2×100
Where: Q fabric breaking strength, N;
single yarn first-class breaking strength, cN/tex; - standard density of yarn in fabric, root/10cm, N
K-- utilization coefficient of yarn strength in fabric; T-+ yarn count, tex.
F2.1.3 Decimals in calculation are not counted, and integers are taken. F2.2 Utilization coefficient K of yarn strength in fabric The utilization coefficient K of yarn strength in fabric is shown in Table F1. F2. 2. 13
Table F1 Strength utilization coefficient
Fabric category
Gauze poplin
Thread poplin
Gabardine and
Medium special and below
Medium special and below
Tightness, %
90～110
F2.2.2 Find out the K value by comparing the fabric type and tightness. Warp
Utilization coefficient K,
1.17～~1. 26
1. 11～1.20
1.08～~1.17
1. 24 ～1, 37
0. 90~0. 98
1. 14~1. 24
1,08~1.18
a) When the fabric tightness is within the range listed in Table F1, the K value increases or decreases proportionally. b) When the fabric tightness is less than the range listed in Table F1, it decreases proportionally. c) If the fabric tightness is greater than the tightness range listed in Table F1, the maximum K value in the table is selected. F2.2.3 Yarn is divided into four grades according to its thickness: extra fine, fine, medium and coarse. The specific grades are: Extra fine 4~10 tex (150°~60°) Fine 11~~20 tex (55*~~29°)
Medium 21~32 tex (28°~19°)
Coarse 32 tex and above (18 and below)
Tightness, %
(F3)
Utilization coefficient K
1.10~1.25
1.05~1.20
1.05~1.20
1.21~1.33
1. 21~1. 33
0. 96~~1. 08
0. 94 ～1. 04
0.94~1.04
0. 86 ~0. 96
GB/T5325—1997
The total elongation is 1% for single yarn and 0% for plied yarn. The total fluff rate is 0.6% for coarse fabric and 0.3% for medium and fine fabric (including plied fabric). The number of edge yarns for plain fabric shall be as specified in Table F2. F5
Table F2 Number of edge yarns for plain fabric
Warp yarn countbzxz.net
Number of edge yarns
12 tex and below
Below 127 cm
13~19.5 tex
20 tex and above
127cm and aboveThe K value increases or decreases in proportion. b) When the fabric tightness is less than the range listed in Table F1, it decreases in proportion. c) If the fabric tightness is greater than the tightness range listed in Table F1, the maximum K value in the table is selected. F2.2.3 Yarn is divided into four grades according to its thickness: extra fine, fine, medium and coarse. The specific grades are: Extra fine 4~10 tex (150°~60°) Fine 11~~20 tex (55*~~29°)
Medium 21~32 tex (28°~19°)
Coarse 32 tex and above (18 and below)
Tightness, %
(F3)
Utilization coefficient K
1.10~1.25
1.05~1.20
1.05~1.20
1.21~1.33
1. 21~1. 33
0. 96~~1. 08
0. 94 ～1. 04
0.94~1.04
0. 86 ~0. 96
GB/T5325—1997
The total elongation is 1% for single yarn and 0% for plied yarn. The total fluff rate is 0.6% for coarse fabric and 0.3% for medium and fine fabric (including plied fabric). The number of edge yarns for plain fabric shall be as specified in Table F2. F5
Table F2 Number of edge yarns for plain fabric
Warp yarn count
Number of edge yarns
12 tex and below
Below 127 cm
13~19.5 tex
20 tex and above
127cm and aboveThe K value increases or decreases in proportion. b) When the fabric tightness is less than the range listed in Table F1, it decreases in proportion. c) If the fabric tightness is greater than the tightness range listed in Table F1, the maximum K value in the table is selected. F2.2.3 Yarn is divided into four grades according to its thickness: extra fine, fine, medium and coarse. The specific grades are: Extra fine 4~10 tex (150°~60°) Fine 11~~20 tex (55*~~29°)
Medium 21~32 tex (28°~19°)
Coarse 32 tex and above (18 and below)
Tightness, %
(F3)
Utilization coefficient K
1.10~1.25
1.05~1.20
1.05~1.20
1.21~1.33
1. 21~1. 33
0. 96~~1. 08
0. 94 ～1. 04
0.94~1.04
0. 86 ~0. 96
GB/T5325—1997
The total elongation is 1% for single yarn and 0% for plied yarn. The total fluff rate is 0.6% for coarse fabric and 0.3% for medium and fine fabric (including plied fabric). The number of edge yarns for plain fabric shall be as specified in Table F2. F5
Table F2 Number of edge yarns for plain fabric
Warp yarn count
Number of edge yarns
12 tex and below
Below 127 cm
13~19.5 tex
20 tex and above
127cm and above
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