This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage requirements of polypropylene base fabrics for tufted carpets. This standard applies to base fabrics for tufted carpets woven from polypropylene slit film fibers (hereinafter referred to as "base fabrics"). QB/T 1556-1992 Polypropylene base fabrics for carpets QB/T1556-1992 Standard download decompression password: www.bzxz.net

Light Industry Standard of the People's Republic of China
Polypropylene Base Fabric for Carpet
1 Subject Content and Scope of Application
QB/T 1556-—1992
This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage requirements for polypropylene base fabric for tufted carpet.
This standard applies to base fabric for tufted carpet made of polypropylene slit film fiber (hereinafter referred to as "base fabric"). 2 Reference standards
General principles for testing methods for mechanical properties of plastics
GB/T 1039
GB/T 1040
GB/T 2918
GB/T 8170
GB/T 8946
3 Product classification
3.1 Product varieties
Plastic tensile test methods
Numerical rounding rules for standard environments for plastic state adjustment and testing
Plastic woven bags
Base fabrics are divided into 95×50, 90×50 and 70×65 varieties according to their warp and weft densities. 3.2 Product specifications
Base fabrics are divided into 4.18, 3.78, 3.48 and 3.18 specifications according to their width. 3.3 Product marking
Width, m
Weight per unit area, g/m2
Warp density × weft density, root/10cm
3.4 ​​Marking example
Warp density 95 roots/10cm, weft density 50 roots/10cm, unit area mass 115g/m2, width 4.18m, the base fabric that meets this standard is marked as:
95×50-115-4.18
QB/T 1556
Polypropylene base fabric for carpet
Note: other varieties and specifications of products shall be agreed upon by the supply and demand parties. 4 Technical requirements
4.1 The technical indicators of the cut film fiber of the base fabric shall be implemented in accordance with Appendix A (reference) of GB/T8946. 4.2 The physical performance technical indicators of the base fabric shall comply with the provisions of Table 1. Approved by the Ministry of Light Industry of the People's Republic of China on July 6, 1992 and implemented on March 1, 1993
Density deviation rate of warp and weft
Deviation rate of mass per unit area
Breaking strength
Elongation at breakbZxz.net
Heat shrinkage
Dimensional deviation
QB/T1556—1992
The appearance quality of the base fabric is measured in rolls as one inspection unit and is classified according to the provisions of Table 2. Table 2
Defect Name
Missing (Broken) Warp
Oil Stains
Poor Package Forming
4.4 Grading Rules
Counted as a single, one hole is counted for every 4 cm2 or less, and the distance between two holes is at least 0.5m
Missing (Broken) Warp within 20 cm is counted as one
One hole is counted for every 20 cm
One hole is counted for every occurrence
Overall weft skew is more than 12 cm
Warp (weft) cut film fibers are not arranged in the normal organization, which is called wrong weaving. One hole is counted for every 4 cm2
The width of the broken edge is within 5 cm, and one hole is counted for every 20 cm. The folding phenomenon of the fabric surface caused by poor base fabric packaging is called wrinkles. Within 0.2cm in width and 50cm in length, 1 spot
The surface of the base fabric is stained with oil, dirt, color, etc. Every 10 cm2 or the cumulative number is 1 spot
Poor packaging of the base fabric is a tapered roll
The length of the uneven end surface of one side of the roll, cm
The quality of the base fabric is evaluated by the physical properties and appearance quality. If all physical properties meet the requirements of Table 1, it is qualified. If one of them fails to meet the requirements, it is unqualified. 4.4.1
Technical indicators
≥550
Not less than the nominal length
Technical indicators
Superior products
Not allowed
Not allowed
First-class products | Qualified products
Not allowed
Not allowed
Not allowed
First-class products and qualified products. 4.4.2 The appearance quality is divided into superior products, acceptable products and other evaluations based on the lowest of the 10 defects.
If the physical properties are qualified, the appearance quality grade is used as the final grade of the product. 4.4.3
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5 Test method
5.1 Physical properties
5.1.1 Test conditions
QB/T1556-1992
5.1.1.1 The sample state adjustment and test adopt the standard environmental conditions specified in GB/T2918. 5.1.1.2 The sample state adjustment adopts the method of GB/T1039 in the environment specified in 5.1.1.1. 5.1.2 Sampling
5.1.2.1 Each sample is full width and 1m in length. No sample is taken within 10m at the beginning and end of each roll. No defects are allowed on the sample. 5.1.2.2 The sample should be cut in the area specified in the figure below. 150
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5.1.3 Data processing
Warp cutting area
Numerical rounding shall comply with the provisions of GB/T8170. 5.1.4 Test method for warp and weft density deviation rate 5.1.4.1 Apparatus: steel ruler with a scale of 1 mm, weft cutting area
5.1.4.2 Steps: Place the sample on a horizontal platform and make it in a natural state. Count the number of cut film fibers in the weft and warp directions in 10 cm in the 6 areas specified in the above figure. The starting point is in the middle of the gap between two warp (weft) cut film fibers. When the point is less than one on the last cut film fiber, it is counted as 0.5. Calculate the arithmetic mean (root/10.cm) and deviation rate. 5.1.5 Test method for unit area mass deviation rate Use a steel ruler with a scale of 1 mm to cut 6 samples of 200 mm×200 mm, weigh them separately (accurate to 0.001 g), and calculate the arithmetic mean (g/m2) of unit area mass according to formula (1). G.
Where: G,--unit area mass, g/m2; X,--mass of each specimen, g;
Number of specimens.
Calculate the deviation rate from the average unit area mass G and the nominal unit area mass G. 5.1.6 Test method for breaking strength and breaking elongation
QB/T1556-1992
5.1.6.1 The test equipment shall comply with the provisions of Chapter 3 of GB/T1040. The effective width of the clamp shall not be less than 60mm, the distance between the clamps shall be 200mm, and the test speed shall be (200±20)mm/min. 5.1.6.2 Cut 6 specimens in the warp and weft directions, 300mm long and 50mm wide, and the test steps shall be carried out in accordance with Chapter 4 of GB/T1040. 5.1.6.3 Test results: The breaking strength is accurate to 2N, and the breaking elongation is accurate to 1%. Calculate their arithmetic mean values. 5.1.6.4 If the sample breaks, slips off or affects the accuracy in the fixture during the test, the sample should be replaced and repeated. 5.1.7 Test method for thermal shrinkage
5.1.7.1 Apparatus: constant temperature oven, vertical ruler with 1mm graduation (with a clamp at the upper end), pre-tensioned hammer (0.5±0.1) cN/tex, stopwatch.
5.1.7.2 Steps
a. Extract 6 pieces of cut film fibers in the warp and weft directions in the specified area, with a length of about 700mm. b. Clamp the samples into the clamp at the upper end of the vertical ruler, hang the pre-tensioned hammer at the lower end of the sample, wait for 30s, and mark the zero point and 500mm (i.e. the length of the sample before heating). c.
Take out the sample, put it into an oven at (132±1)℃ (lay 4 layers of gauze on the shelf), and dry it for 20 minutes. d. Take out the sample, cool it to room temperature, hang it on a vertical ruler, align the mark on one end with the zero point, hang the original tension weight, wait for 30 seconds, measure the length between the two marks (i.e. the length of the sample after heating) and record it, accurate to 1mm. Calculate the heat shrinkage rate (%) according to formula (2). Lo= L × 100
E(%) =
Where: E heat shrinkage rate,
L. --- Length of sample before heating, mm;
Average length of sample after heating, mm.
5.1.8 Determination of width deviation
Use a steel ruler with a length greater than the width and a friction of 1mm. Within a range of not less than 10m at one end of the sample roll, measure the width dimensions at five locations with an accuracy of 0.01m, and calculate the width deviation according to formula (3). =×100
Where: D—width deviation rate, %;
L—average value of measured width, m;
Ls—specified width, m.
5.2 Appearance quality
(3)
Inspect by visual inspection under sufficient light. Mark the defects, record and grade them. Defect record cards are packed with the rolls. 6 Inspection rules
Inspection is divided into factory inspection and type inspection.
6.1 Factory inspection
6.1.1 Physical properties of breaking strength, breaking elongation and thermal shrinkage are sampled and inspected by batch. 6.1.2 Appearance quality is inspected in full.
6.2 Type inspection
6.2.1 Type inspection should be carried out in the following cases. a. After formal production, if there are major changes in organizational structure, materials and processes, which may affect product performance; b. During normal production, inspection should be carried out periodically after a certain amount of production has been accumulated; c.
When the national quality supervision agency proposes a type inspection requirement. 6.2.2 Type inspection Physical properties and appearance quality shall be sampled and inspected by batch. Products of the same variety, material, specification and processing process that are continuously produced shall be considered as a batch. The number of samples to be taken is shown in Table 3.114
Sample size
6.3 Judgment rules
Below 50
QB/T 1556—1992
50～~100
101~200
Above 200
6.3.1 Physical properties shall be inspected as specified in Table 1. If one of the indicators is unqualified, it is allowed to double sample from the batch of products for re-inspection. If the re-inspection is qualified, the batch of products shall be judged as qualified products. If it is still unqualified, the batch of products shall be judged as substandard products. 6.3.2 Appearance quality shall be inspected as specified in Table 2. If one of the indicators is lower than the original product quality requirements during type inspection, it is allowed to double sample from the batch of products for re-inspection. If the re-inspection reaches or exceeds the original product quality requirements, the batch of products is judged to be original products; if it still does not reach the original product quality requirements, the quality of the re-inspection result is used as the quality of the batch of products. 7 Marking, packaging, transportation, storage
7.1 Marking
7.1.1. Product marking
The production unit shall provide the user with the following product markings: a.
Manufacturer name:
Product name;
Trademark;
Product mark;
Quantity;
Color;
Product quality, etc.
Packaging mark
The basic contents of the packaging mark are:
Manufacturer name;
Product name;
Trademark;
Product mark;
Product grade;
Product quantity;
Color;
Manufacturing date;
Reminder: "No hooks allowed", "Moisture-proof and sun-proof", etc. 7.2 Packaging
7.2.1 The length of each roll of the base fabric is 800~1000m. 7.2.2 The base fabric adopts an overall closed packaging, which should ensure that the product is not damaged, can prevent dirt and moisture, and is easy to store and transport. 7.3 Transportation and storage
7.3.1 The base fabric should be protected from sunlight and rain during transportation. 7.3.2 The base fabric should be stored indoors and placed horizontally. The storage period shall not exceed one year. Additional Notes:
This standard was proposed by the Quality Standards Department of the Ministry of Light Industry. This standard is under the jurisdiction of the National Carpet Standardization Center. This standard was drafted by Beijing Yanshan Petrochemical Company Chemical Fiber Carpet Factory, Wuxi Plastic Flooring Material Factory, Chengde Jute Chemical Fiber Textile Factory, and Tianjin Carpet Research Institute.
The main drafters of this standard are Wu Binyi, Yang Pinghong, Qian Xiaoqin, Yan Huimin, and Xia Jiadie. 115
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