Some standard content:
National Standard of the People's Republic of China
Needle-punched carpet
1 Subject content and scope of application
GB/T 15051—94
This standard specifies the technical requirements, test methods, inspection rules and requirements for marking, packaging, transportation and storage of needle-punched carpet products. This standard is applicable to needle-punched carpets made of synthetic staple fibers such as polypropylene and polyester, which are made by piercing the fiber web with needles on a needle-punching machine to make the fibers entangled with each other, and applying adhesive on the back of the carpet and heating to solidify. Needle-punched carpets made of other staple fibers can also be used as a reference.
2 Reference standards
Test method for colour fastness to rubbing of textiles
GB3920
GB6529
Standard atmosphere for conditioning and testing textilesGB8170
GB 11049
Rules for rounding off values
Burning behaviour of floor coveringsTablet test at room temperatureProcedure for inspection of imported textiles
ZBW55002i
QB 1087
QB1089
QB1091
Sampling and test specimen cutting method for physical testing of machine-made carpetsTest method for thickness of machine-made carpets
Test method for reduction of thickness of carpets under dynamic loadQB/T 1188
3 Terminology
Test methods for carpet quality
3.1 Damage: holes, tears, cuts, etc. on the carpet body. Stains: The carpet surface is stained with oil, color spots, rust spots, glue spots, etc. 3.2
3.3 Unclear stripes and patterns: The carpet surface has defects or disordered patterns. 3.4 Glue penetration: The glue liquid seeps into the carpet surface.
3.5 Uneven glue coating: The back of the carpet lacks glue or the thickness of the glue layer is uneven. 3.6 Bad carpet edge: The carpet edge is not flat.
Crease: The carpet body has irreversible stripes. 3.7
3.8 Scorch: The carpet body shows scorch marks such as melting, discoloration, etc. 4 Product classification
4.1 Product varieties
According to the different structural characteristics of the carpet surface, needle-punched carpets are divided into four varieties: stripes, patterns, suede, and felt. 4.2 Product specifications
Approved by the State Bureau of Technical Supervision on May 7, 1994 and implemented on December 1, 1994
GB/T 1505194
The specifications of needle-punched carpets are differentiated according to the fiber web raw materials, unit area mass (g/m2), thickness (mm) and width (m). 4.3 Product marking
Marking meaning:
Standard number
-Width (m)
Thickness (mm)
Unit area mass (g/m2)
One stripe
Marking example
-Pattern
A needle-punched carpet with a unit area mass of 800g/m2, a thickness of 6mm, and a width of 2m is marked as: Polypropylene needle-punched striped carpet 800-6-2GB/T15051 Note: The raw material name of the fiber is placed before the needle-punched carpet. Technical requirements
5.1 Intrinsic quality technical indicators
Should comply with the provisions of Table 1 (limited to products with a fiber content of 500g/m2 and above. If it is lower than this limit, the supply and demand parties shall enter into another agreement). Table 1
Test Items
Thickness Reduction Rate under Dynamic Load1))
Appearance Change (Four-foot)
Lower Limit Deviation of Mass per Unit Area
Color Fastness to Light (Xenon Arc)
Color Fastness to Rubbing (Dry)
Flammability (Horizontal Method, Tablet)
Superior Products
Stripes≤35
Pile ≤40
Felt ≤20
Technical Index
First-class Products
>2～3
Qualified Products
Damage Length≤75 (At least seven out of eight pieces are qualified) Note: 1) For the thickness or structure of patterned carpets, if there are separate test areas, this item shall be assessed, otherwise no test shall be conducted. 5.2 Appearance Quality
Shall comply with the provisions of Table 2.
5.3 Grading rules
Defect name
Unclear stripes and patterns
Uneven glue coating
Bad blanket edge
Lower limit deviation of width
GB/T 15051--94
Superior product
Not allowed
Not obvious
Not allowed
Not obvious
Not allowed
Not allowed
Not allowed
Not less than the specified size
First-class product
Not allowed
Not obvious
Not obvious
More obvious
Not obvious
Qualified product
More obvious
Not obvious
5.3.1 Needle-punched carpets are divided into three grades: superior product, first-class product and qualified product according to their internal quality technical indicators and appearance quality. Those lower than qualified products are substandard products.
5.3.2 The internal quality rating is based on batches (the same raw materials, process parameters, varieties and specifications are considered as a batch); the appearance quality rating is based on rolls.
5.3.3 The product grade is evaluated by combining the internal quality and appearance quality, and the lowest grade of the internal quality and appearance quality is used to determine the grade of the batch of products.
6 Test method
6.1 Appearance quality inspection: The inspector shall visually inspect and feel the blanket surface and blanket back. The width dimension deviation test method is shown in Appendix A (Supplement).
6.2 Intrinsic quality test method
6.2.1 Test conditions
6.2.1.1 Standard atmosphere for humidity adjustment and testing
The standard atmosphere for humidity adjustment and testing adopts the second-level test standard atmosphere specified in GB6529, with a temperature of 20±2C and a relative humidity of 65%±3%. The arbitration test must use the first-level test temperate standard atmosphere. 6.2.1.2 Humidity conditioning
Before the test, condition the sample under the standard test atmosphere specified in 6.2.1.1. Place the sample flat with the use surface facing up and condition for at least 24 hours.
The sampling method shall be in accordance with QB1087.
6.2.3 Calculation of test results
Numerical rounding shall be in accordance with the provisions of GB8170.
6.2.4 Thickness
Test method shall be in accordance with QB1089.
6.2.5 Thickness reduction rate under dynamic load
Test method shall be in accordance with QB1091. Among them, for needle-punched carpets: the number of times the steel foot hits the end point is specified to be 500 times. 97
GB/T 15051--94
The thickness reduction rate under dynamic load is calculated according to formula (1): D = = × 100
Wherein: D——thickness reduction rate under dynamic load, % (accurate to one decimal place); to is the arithmetic mean of initial thickness, mm;
t is the arithmetic mean of thickness after 500 actual impacts, mm. 6.2.6 Unit area mass deviation
The test method shall be in accordance with QB/T1188.
The unit area mass deviation percentage is calculated according to formula (2): D, = m=mo × 100
Wherein: D,-
unit area mass deviation percentage, % (accurate to one decimal place); the arithmetic mean of the measured unit area mass, g/m2; m,
-calibrated unit area mass, g/m2.
6.2.7 Color fastness to light (xenon arc)
The test method shall be in accordance with 5.1.1 of ZBW55002. 6.2.8 Color fastness to rubbing (dry)
The test method shall be in accordance with GB3920. Among them, the end diameter of the friction head of the carpet rubbing color fastness tester is 25mm, the downward pressure is 22N, and the size of the cloth used for the friction test is 80mm×80mm. 6.2.9 Flame resistance (horizontal method, tablet)
The test method shall be in accordance with GB11049. Among them, the humidity adjustment of the sample shall be carried out according to method 4.3(b). The test result is expressed by measuring the maximum distance from the center of each sample to the damaged edge. 6.2.10 Appearance change
The test method and evaluation shall be in accordance with Appendix A (supplement). 7 Inspection rules
Product inspection is divided into factory inspection and type inspection. 7.1 Factory inspection
7.1.1 Appearance quality should be fully inspected. 7.1.2 Internal quality should be sampled for major items, thickness reduction rate under dynamic load, and flame retardancy by batch. The items and sampled quantity shall be agreed upon by both the supplier and the buyer.
7.2 Type inspection
7.2.1 Type inspection shall be carried out in any of the following cases: a.
After formal production, if there are major changes in product structure, raw materials, and process conditions that may affect product performance; during normal production, the product should be inspected periodically (generally not more than one year) after a certain amount of production has been accumulated; when the national quality supervision agency proposes a requirement for type inspection. 7.2.2
Type inspection conducts sampling inspection on the quality of the product, with batches as units. The batch size and sample size are shown in Table 3. Table 3
Batch size
Sample size
7.3 Judgment rules
Below 100
100~200
201~400
Above 400
The test items of intrinsic quality shall be tested in accordance with the standard requirements. If only one of the indicators fails to meet the standard, the batch of products is allowed to double sample and retest the item. If it still fails, the batch of products is judged as unqualified. If it is qualified or better than qualified products after retest, the batch of products is judged as qualified.
8 Marking, packaging, transportation and storage
8.1 Marking
8.1.1 Product marking
The production unit shall provide consumers with product markings, the basic contents of which are: a.
Manufacturer name;
Product name,
Trademark,
Manufacturing date;
Product quality, etc.;
Product mark.
Packaging mark
Basic content:
Manufacturer name;
Product name,
Trademark;
Product mark, color and quantity;
Product grade, etc.;
Manufacturing date;
Prompts such as "No hooks allowed", "Moisture-proof", "Do not press heavily", etc. 8.2 Packaging
Needle-punched carpet packaging should ensure that the product is not damaged, can prevent dirt and moisture, and is easy to store and transport. 8.3 Transportation, storage
Carpets should not be pressed heavily during transportation and storage, and should be kept away from sunlight and rain, moisture, and fire sources. The ambient temperature should not exceed 40℃. 99
A1 Width
A1.1 Principle
GB/T 15051—94
Appendix A
Test method and evaluation of appearance change
(Supplement)
Measure the width of the carpet at different locations with a ruler. A1.2 Measuring tool
Steel tape measure, the length of which should be greater than the width of the carpet, scale value, mm. A1.3 Measuring method
A1.3.1 Unroll the carpet and lay it flat, and then measure it after it is in a relaxed state. A1.3.2 Measure the width of at least five different locations of each roll of carpet, accurate to 1 mm. A1.3.3 Calculation of test results
The width deviation percentage is calculated according to formula (A1): = ×100
Wherein: D—
width dimension deviation percentage, % (accurate to one decimal place); l—arithmetic mean of the measured width dimension, mm (accurate to 1 mm); L.—nominal dimension, mm.
A2 Test method for appearance change (four-legged) A2.1 Scope
This method specifies the test procedure for the appearance change of needle-punched carpet under the mechanical action of a four-legged drum tester. A2.2. Principle
A four-legged body with four polyurethane is placed in a drum covered with a carpet sample. The sample is randomly rolled and stepped on in the drum for a specified number of times, and the carpet surface produces appearance structure and color changes. A2.3 Equipment
A2.3.1 Rolling polyethylene round tube, inner diameter 200~210mm, cylinder depth 190～~195mm, wall thickness 6mm, roller speed 50±2r/min. And a cover to close one end. A2.3.2 Quadruped (treader): a casting composed of four metal cylinders at the top, each cylinder is embedded with a polyurethane hemispherical foot.
A2.3.3 Vacuum cleaner
A2.4 Selection and preparation of samples
A2.4.1 According to QB1087, the selected samples should represent this batch of products as much as possible. A2.4.2 Cut two samples at adjacent positions, mark the back of the blanket in the same machine direction, take a sample with a length of about 620mm and a width of 185mm in the machine direction as a fatigue sample, and take another sample with a length of 300mm and a width of 185mm in the machine direction as a sample without fatigue test (for comparison of appearance change assessment). A2.5 Test procedure
A2.5.1 Load the sample onto the inner wall of the roller, clamp it with two spring steel wires, scrub the feet of the four-legged body with 95% concentration ethanol, then put it into the roller, cover it tightly, and place it on the support frame. A2.5.2 Preset the counter to 5000 times, wait for the roller to stop automatically, take out the sample, and use a vacuum cleaner to vacuum the sample first along the longitudinal direction of the sample and then along the inclination direction of the pile for 100
. Carry out intermediate stage rating.
GB/T15051—94
A2.5.3 Reload the sample into the roller and repeat the above procedure until the end point is 10,000 times, and the roller stops automatically. Take out the sample and vacuum the fatigue sample with a vacuum cleaner according to the above requirements. Leave it for 24 hours before rating, and then rate it. A3 Evaluation of appearance change
A3.1 Scope of application
This method is applicable to the evaluation of needle-punched carpets with changes in carpet surface appearance produced by a four-legged roller tester. A3.2 Carpet surface appearance change
The comprehensive appearance change between the fatigue and non-fatigue sample use surfaces should consider the following characteristics: A3.2.1 Structural change
The carpet surface pile loops and (or) fiber shapes have visible changes. It is due to the mechanical force that the carpet surface thickness is reduced, the pile is flattened, lodged, loosened, and felted, which reduces the clarity of the pile. A3.2.2 Fuzzing
Fibers protruding from the blanket surface that cannot be removed after suction or fibers entangled and compressed and attached to the blanket surface (the result of severe fuzzing). A3.3 Principle
Compare the blanket surfaces of fatigued and non-fatigued specimens, and compare them with standard specimens to visually evaluate the changes in the appearance of the specimens. A3.4 Standard materials and equipment
A3.4.1 Standard specimens
Standard specimens are standard objects for reference in evaluating the changes in the appearance of blanket surfaces. There are five standard levels of standard specimens, namely 5, 4, 3, 2, and 1, which change in sequence and the severity gradually increases. Each standard specimen level includes two samples, non-fatigued and fatigued. Level 5: no change,
Level 4: slight change;
Level 3: moderate change;
Level 2: large change;
Level 1: severe change.
A3.4.2 The lighting device shall use D65 standard light source with illuminance of 11001x. The light shall illuminate the sample surface vertically. The indoor brightness shall be natural or dim.
A3.4.3 Rating table: The size shall be able to display the standard sample and the sample side by side. A3.4.4 The cover frame shall be made of neutral gray, non-reflective material and have a rectangular hole. This is to limit the evaluation work to the general appearance change part of the sample, which will represent the overall appearance change. The size of the hole is 200mm×300mm, and the fatigue specimen, non-fatigue specimen, and standard specimen area of 150mm×200mm can be observed side by side at the same time, see Figure A1. 101
Non-fatigue specimen
Non-fatigue standard specimen
A3.5 Selection and preparation of specimens
Multiple illumination directions
GB/T 15051—94
Evaluated specimens
Grade standard specimens
Xi-lao specimens
Cut-lao standard specimens
Select a fatigue area with general changes that can represent the overall changes of the carpet surface on the fatigue specimen as the evaluation area, and at the same time select a reference area on the non-fatigue specimen area. The reference direction is the same as the specimen marking direction, and they are arranged side by side in the same direction as the reference direction, covered with a cover frame, and the standard specimens to be evaluated (with selected grades) are placed side by side on the rating table. See Figure A1. A3.6 Assessment Procedure
A3.6.1 The selected standard sample is compared with the fatigued sample and the non-fatigued sample. The assessment work shall be carried out visually by at least three persons separately. A3.6.2 Assessment of the change of the carpet surface appearance
Each assessor shall assess the change of the appearance of the sample carpet surface against the grade of the standard sample, and may assess half a grade. Any change in color shall be ignored, and any significant change in appearance specified in this appendix shall be recorded. A3.7 Inspection Report
The inspection report shall include the following items: a.
The test and evaluation methods adopted in this standard and all details of deviations from this standard; instrument model, test endpoint number;
The level of appearance change evaluated by each assessor; the median of the level of appearance change;
“Significant appearance change” that should be noted in the assessment items. Additional notes:
This standard was proposed by the China Light Industry General Association. bZxz.net
This standard is under the jurisdiction of the National Carpet Standardization Technical Committee. This standard was drafted by Tianjin Carpet Research Institute, Shanghai Textile Science Research Institute, Shanghai Petrochemical General Plant Experimental Plant, and Gansu Nonwoven Carpet Factory.
The main drafters of this standard are Zhang Yufen, Li Xiaowen, Xia Jiadie, Zhu Shouheng, Gong Jialai, and Wu Shensha. 102
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