This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of polyurethane dry process artificial leather. This standard applies to polyurethane artificial leather made by dry process with polyurethane as the main component, solvents, additives and other auxiliary materials added, and suede as the base material. GB/T 8949-1995 Polyurethane dry process artificial leather GB/T8949-1995 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Polyurethane dry-processing artificial leather
Polyurethane dry-processing artificial leather1 Subject content and scope of application
GB/T 8949--- 1995
Replaces GB894988
This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of polyurethane dry-processing artificial leather (hereinafter referred to as PU leather).
This standard applies to polyurethane artificial leather made of polyurethane as the main component, with solvents, additives and other auxiliary materials added, and suede cloth as the base material, and processed by dry processing.
2 Reference standards
GB2828 Batch inspection counting sampling procedures and sampling tables (applicable to continuous batch inspection) GB2918 Standard environment for plastic specimen state adjustment and testing GB/T6673 Determination of length and width of plastic film and sheet GB/T8948 Polyvinyl fluoride artificial leather
Test method for tensile properties of plastic film
GB 13022
3 Product classification
Products are divided into Class A, Class B, and Class C according to their use (see Table 1). Table 1
4 Technical requirements
4.1 Specifications
4.1.1 Thickness and its limit deviation shall comply with the provisions of Table 2. Approved by the State Bureau of Technical Supervision on December 8, 1995 Main uses: Clothing, gloves, bags, luggage, furniture Implementation on August 1, 1996 Category A, B, C GB/T 8949-1995 Width and its limit deviation shall comply with the provisions of Table 3. Table 3 Category A, B, C 4.1.3 Length of each roll and its limit deviation ≥ 1000 The length is generally 50m/roll, and the limit deviation is + 0.10m. 4.1.4 The number and length of each roll shall comply with the provisions of Table 4, Table 4
Number of sections, sections
Length of each section, m
Superior products
Note: For each additional section (i.e. cut ends and uncut joints), the ruler should be 0.1m. 4.2 Appearance
The appearance shall comply with the provisions of Table 5.
Superior products
Delamination (including bubbles, empty shells and poor lamination) Pinholes
Traces, wrinkles
Oil stains, impurities and other defects
4.3 Physical and mechanical properties
The physical and mechanical properties shall comply with the provisions of Table 6.
Not allowed
Not allowed
Not allowed
Not allowed
First-class products
First-class products
Basically the same
Not allowed
Not obvious
Not obvious
Limit deviation
Limit deviation
Qualified products
Qualified products
Basically the same
Basically clear
No Allowable
Not obvious
Not obvious
Not obvious
Tensile load
Elongation at break
Tear load
Peel load
Cold resistance
Surface color fastness, grade
Anti-adhesion, grade
Folding fastness
5Test method
Warp, weft
Superior product
≥120
≥120| |tt||5.1 Sample condition adjustment and test environment
GB/T8949—1995
≥100
≥100
Qualified products
≥100
≥100
Superior products
≥170
≥210
-Qualified products
≥150
≥200
No cracks
Qualified products|| tt||Superior products
≥140
≥190
25,000 times, no cracks
≥300
≥300
≥280
≥280
Qualified products
≥250
≥250
According to the standard environment and normal deviation range in GB2918, the sample state adjustment time is not less than 4h, and the test is carried out under this condition.
5.2 Sampling
Take a length of about 0.65m from the sample, remove 50mm on both sides of the width direction, and the arrangement and size of the sample cutting are shown in the figure. Www.bzxZ.net
5.3Thickness
GB/T8949—1995
Product n0m
1-Tensile load and elongation at break test sample (length 200mm width 30mm); 2-Tear load test sample (length 150mm width 30mm); 3Peeling load test sample (length 150mm2 width 30mm); 4-Surface color fastness test sample (length 220mm width 60mm); 5-Anti-adhesion test sample (length 60mm2 width 60mm); 6-Folding fastness test sample (length 70mm2 width 45mm); 7-Cold resistance test sample (length 60mm2 width 20mm) shall be carried out in accordance with the relevant provisions of GB/T8948.
5.4Width
shall be carried out in accordance with the relevant provisions of GB/T6673. 5.5Length
shall be carried out in accordance with the relevant provisions of GB/T6673. 5.6 Appearance
Visual inspection under natural light.
5.7 Tensile load and elongation at break
Perform in accordance with the relevant provisions of GB/T8948.
5.8 Tear load
Perform in accordance with the relevant provisions of GB/T8948.
5.9 Peel load
5.9.1 Apparatus
Tensile testing machine, which shall comply with the provisions of GB13022; constant temperature drying oven, with air blowing device.
5.9.2 Test steps
Take three samples, and use appropriate amount of adhesive to stick the coating to the same leather coating together, and then place the bonded samples in a constant temperature drying oven at 135±5°C, dry for 10 minutes, and then take out the samples and cool them to room temperature. 364
GB/T8949-1995
After 2h, peel the sample after bonding by hand, separate the coating and base fabric of the sample to 50mm, and then clamp the separated ends on the fixture of the tensile testing machine and stretch at a speed of 200mm/min. Observe the peeling of the sample and record the maximum load of the sample peeling.
5.9.3 Test results
The arithmetic mean of each group of samples, accurate to 1N; a.
b, the sample coating is completely broken, and the maximum reading indicated by the pointer is the peeling load of the sample; .
The coating and base fabric of the sample cannot be peeled off by hand, and the peeling load of the sample is qualified. If a group of samples cannot be peeled off, the test result is qualified.
5.10 Surface color fastness
Carry out according to the relevant provisions of GB/T8948.
5.11 Anti-adhesion
5.11.1 Apparatus
Constant temperature drying oven with air blowing device.
5.11.2 Test steps
Take six samples, and match the coatings together in three groups. The three groups of samples are clamped between two glass sheets of 60mmX60mm×3mm, and a 1kg weight is pressed on the clamps. They are placed in a drying oven at a temperature of 80±2℃. After keeping the temperature constant for 3h, take out the samples, place them at room temperature for 30min, and then open the matched samples by hand. 5.11.3 Test results
The test results are determined in the following way. Level 5: Can be peeled off lightly.
Level 4: Peeled off with a little force.
Level 3: Peeled off with a certain amount of force, and the surface is not damaged. Level 2: Peeled off under gravity, and incomplete peeling occurs. Level 1: Cannot be peeled off.
Take the lowest value of the three groups of samples as the test result. 5.12 Folding fastness
Perform according to the relevant provisions of GB/T8948.
5.13 Cold resistance
Perform according to the relevant provisions of GB/T8948. The test temperature is shown in Table 7. Table 7
Superior products
-20℃
6 Inspection rules
6.1. Inspection classification
6.1.1 Factory inspection
First-class products
The factory inspection items are all items in the technical requirements except the folding fastness of categories A and B. 6.1.2 Type inspection
Under normal circumstances, the inspection is carried out once every 6 months. If one of the following situations occurs, a type inspection should be carried out. a. When the process formula changes;
b., when resuming production after a long-term shutdown;
Qualified products
GB/T8949--1995
When the superior quality supervision agency proposes type inspection requirements. 6.2 Factory inspection
6.2.1 Batching and sampling
6.2.1.1 Batching
PU leather should be inspected by batch. PU leather with the same formula, same specification, same pattern and same color is a batch, and the quantity of each batch shall not exceed 2 square meters.
6.2.1.2 Sampling
The inspection of specifications and appearance adopts the general inspection level I, secondary sampling plan and AQL of 6.5 specified in GB2828 (see Table 8). For physical and mechanical properties, one roll is randomly selected from each batch for inspection. Table 8
Batch range
N(roll)
16～25
51～90
91~150
151～280
281～500
6.2.2 Judgment rules
6.2.2.1 Judgment of qualified items
Sample size
Cumulative sample size
Number of qualified judgments
Number of unqualified judgments
The judgment of the sample units of specifications and appearance shall be carried out in accordance with 4.1 and 4.2 of this standard respectively. If the inspection results of the sample units meet the requirements of Table 8, the specifications and appearance are judged to be qualified.
If there are unqualified items in the physical and mechanical properties inspection results, double sampling shall be taken from the original batch and the unqualified items shall be re-inspected. If all the re-inspection results are qualified, the physical and mechanical properties are judged to be qualified. 6.2.2.2 Determination of qualified batches
If all items are qualified, the batch of PU leather is qualified. If any one item is unqualified, the batch of PU leather is unqualified. 6.3 Type inspection
6.3.1 Sampling
Randomly select one roll from the PU leather that has passed the factory inspection for appearance and specification inspection, and select 1m for physical and mechanical properties inspection. 6.3.2 Determination rules
Appearance and specifications shall be carried out in accordance with Articles 4.1 and 4.2 of this standard respectively. If unqualified, 3 rolls of the original PU leather shall be randomly selected for re-inspection. If all the re-inspection results are qualified, the appearance and specifications shall be judged to be qualified. GB/T8949-1995
If any item is unqualified in the physical and mechanical properties inspection, double sampling shall be re-taken from the original batch, and the unqualified items shall be re-inspected. If all the re-inspection results are qualified, the physical and mechanical properties shall be judged to be qualified. If the appearance, specifications, and physical and mechanical properties are all qualified, the type inspection is considered qualified. 7 Marking, packaging, transportation, and storage
7.1 Marking
Each roll of product should be accompanied by a certificate of conformity and have the following markings: a.
Manufacturer name and address;
Product name;
Registered trademark;
Product specification;
Quality grade;
Production date and production batch number;
Implementation standard number;
Inspector code.
7.2 Packaging
The product is rolled into a neat round roll with the core with the coating facing inward. Both ends of each section in the roll are stamped with inspection stamps. Each roll of product is generally packed with film or packaging paper.
7.3 Transportation
When transporting products, they cannot be heavily pressed. They should be loaded and unloaded gently. They should not be exposed to the sun or rain, and the packaging should be kept intact. 7.4 Storage
7.4.1 The product should be stored indoors with good ventilation and dryness, and should not be near heat sources. 7.4.2 Under the above conditions, the performance of the product should meet the requirements of this standard within a storage period of no more than one year from the date of production. Additional remarks:
This standard was proposed by the China Light Industry General Association.
This standard is under the jurisdiction of the National Technical Committee for Standardization of Plastic Products. This standard was drafted by Shijiazhuang No. 1 Plastic Factory. The main drafters of this standard are Wang Xiuping and Wang Wuying. 367
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