The biggest enemy of clothing life is damage. Moreover, the strength of the fabric is also a concern of upstream and downstream textile enterprises, which not only affects the quality of the finished product, but also has an important impact on the process. Even affect product shipments.
Appraisal indicators of clothing strength are mainly divided into: fabric breaking strength, tearing strength, seam strength, cracking degree, bursting strength and bursting strength. The evaluation items and requirements for different products are also different.
GBT 3923.1—1997 "Tensile properties of textile fabrics-Part 1 Determination of breaking strength and elongation at break" Strip method ";
GBT 3923.2—1998 "Tensile properties of textile fabrics-Part 2 Determination of breaking strength" Grab sample method ";
GBT 19976—2005 "Determination of bursting strength of textiles; steel ball method";
GBT 7742.1—2005 "Textiles; bursting properties of fabrics; determination of bursting strength and bursting expansion; hydraulic method";
The tear strength of the fabric is selected from GBT 3917—2009 "Tear Properties of Textiles" according to the standard;
Peel strength According to the washing condition of the product, select the corresponding standard and inspection method according to FZT 80007-2006 "Test Method for Peel Strength of Adhesive Interlining Clothing";
Cracking and seam strength are tested in accordance with the methods marked in the appendix after the product standard.
Certain product-specific inspection indicators can also be inspected at this time, such as the thermal insulation and breathability of thermal underwear. The test standard involved is GBT 11048—2008 "Determination of Thermal and Moisture Resistance of Textiles under Physiological Comfort and Steady Conditions ", GBT 5453-1997" Determination of breathability of textile fabrics "; standards for hair removal rate and water absorption of towel products include GBT22798-2009" Test method for hair removal rate of towel products ", GBT 22799-2009" Test method for water absorption of towel products " ", As well as clothing with fillers, such as cotton clothing, it must also be checked whether the fillers meet the GB 18383" General Technical Requirements for Fiber Products Used for Battling ".
The breaking strength test is performed on a fabric sample of a specified size and stretched at a constant elongation rate until it breaks.
At present, the main products for evaluating the strength of fabric breakage are washed clothing, denim clothing and bedding.
There are two main test methods: GB / T 3923.1-2013 "Textile fabric tensile properties Part 1: Determination of breaking strength and elongation at break (strip method)" and GB / T 3923.2-2013 "Textile fabric tensile Properties Part 2: Determination of breaking strength (grab sample method).
There are two types of testing methods for tearing strength: impact pendulum method and trousers test method.
The impact strength test of the impact pendulum method is to fix the sample on the fixture, cut the sample into a cut, and release the pendulum at the position of the maximum potential energy. When the movable fixture leaves the fixed fixture, the sample is torn in the direction of the cut Cracking, the work done to tear a certain length of fabric is converted into tearing force. The test standard is GB / T 3917.1—2009 "Tear properties of textiles. Part 1: Determination of tear strength by impact pendulum method". This method is mainly used in the detection of denim clothing in daily testing.
The tear strength test of the trouser-shaped sample is to clamp the two legs of the trouser-shaped sample so that the cut line of the sample is straight between the upper and lower clamps. Operate the instrument to apply tensile force to the direction of the incision, record the tearing force until the tear is within a specified length, and calculate the tearing force by the electronic device. The test standard is GB / T 3917.2—2009 "Tear properties of textiles. Part 2: Determination of tear strength of trouser-shaped specimens (single seam)". This method is mainly used in the daily testing of conventional products such as shirts, men's and women's suits.
Yarn slip resistance at woven seams
The measurement of the anti-slip of yarns in woven fabric seams refers to folding a rectangular sample and sewing it along the width direction, then cutting it along the crease, holding the sample with a holder, and applying it perpendicular to the seam direction Tensile load is a measure of the amount of slippage that occurs when a predetermined load is applied.
In daily testing, the commonly used standard is GB / T 13772.2-2008 "Determination of slip resistance of yarns at seams of woven fabrics-Part 2: Constant load method", which is mainly used for testing of conventional woven fabrics.
When the project detects the finished garment, we will test the yarn slip at the seam of the garment (also known as the degree of cracking) according to the requirements and methods specified in the corresponding product standard. Different product standards have different regulations on sample size, constant load value, sampling location, and result judgment. such as:
GB / T 2664—2009 “Men's Suits and Coats” and GB / T 2665—2009 “Women's Suits and Coats” stipulate that the applied load is
Fabric: (100 ± 2) N, Lining: (70 ± 1.5) N
GB / T 18132—2008 "Silk Clothing"
Fabric: Applied load (67 ± 1.5) N with a gram weight> 52g / m2, satin type applied load (45 ± 1.0) N with a gram weight ≤52g / m2 or> 67g / m2, and lining load (70 ± 1.5 ) N.
Burst Strength & Burst Strength
The bursting strength test is to hold the specimen in a ring specimen holder on a fixed base. The spherical ejector rod vertically faces the specimen at a constant moving speed to deform the specimen until it breaks. Powerful.
The test standard is GB / T 19976—2005 "Determination of bursting strength of textiles. Steel ball method", which is mainly used for the inspection of knitted products.
The burst strength test is to clamp the sample on an extensible diaphragm, and apply liquid pressure under the diaphragm to expand the diaphragm and the sample. Increase the volume of the liquid at a constant rate until the specimen breaks, and the burst strength and burst expansion can be measured.
The test standard is GB / T 7742.1—2005 "Textiles. Burst performance of fabrics. Part 1: Determination of burst strength and burst expansion. Hydraulic method". It is mainly used for the inspection of wool knitwear.
Key points of the strong test
First of all, the humidity control of the sample should not be forgotten. All strength tests require pre-conditioning, conditioning and testing in accordance with GB / T 6529.
Second, the choice of test method is a prerequisite. It is a prerequisite to choose the correct standard and test method according to the characteristics of the product.
Again, pay attention to the details of the sampling. The selected sample should be representative, avoiding wrinkles and cloth edges, and the sampling position should be more than 150mm from the cloth edges. Every two samples shall not contain the same warp or weft, that is, take the step method. The size of the sample and the setting of the instrument should strictly follow the requirements of the standard.
Finally, it is important to determine whether the test results are valid. Determine whether the test results are valid according to the standard requirements. If you discard the test results, you need to re-sample for testing. Special circumstances that occurred during the test should also be recorded.