Detailed explanation of textile testing projects - China Garment Website_China's popular garment and fashion information platform

Detailed explanation of textile testing items

We are familiar with fabric testing such as ISO, SGS, Oeko-Tex Standard 100, BV certification, etc. We have a certain understanding of these inspection certificates, but we may not know much about the fabric testing items. The following article will explain the specific items of fabric product testing.

The testing of fabric products generally consists of six major items and multiple small items

Physical properties

Density, yarn count, weight per square meter, spinning yarn twist, spinning yarn strength, fabric structure , fabric thickness, loop length, fabric coverage factor, fabric shrinkage or weaving shrinkage, skew deformation, tensile strength, tearing strength, seam slippage, seam strength, bonding strength, single yarn strength, spinning Unit linear density strength of the thread, anti-snagging, crease recovery angle test, stiffness test, water repellency test, leakage resistance, elasticity and recovery force, air permeability, water vapor permeability, general clothing flammability, children’s evening clothing flammability properties, bursting strength, wear resistance test, pilling resistance, etc.

Yarn count: refers to the thickness of the yarn, represented by Ne, and its definition is: when the public moisture regain is 9.89% Multiples of 840 yards of length of 1 pound of cotton yarn.

Density: the number of yarns spun per INCH.

Weight per square meter: Weight in ounces per square yard of fabric or weight per square meter of fabric per square meter.

Tensile strength: When a fabric of a certain size is stretched by a tensile strength machine at a constant rate until it breaks. The force is the measured tensile strength. The tensile strength test includes grab sample method and strip method. The specific test method is selected according to different test standards and customer requirements.

Tear strength: A sample of a certain size is clamped on the tear strength tester, and a slit is cut in the middle. Determine the tearing direction. The force used by the tearing strength meter to tear the sample from the incision is the measured tearing strength.

Seam slippage: After folding the fabric of a certain size, sew along the width direction and a certain distance away from the seam. After cutting, use a tensile strength meter to stretch to a certain suture opening at a constant rate. The force used to stretch to a certain suture opening or the opening distance when stretching to a certain strength is the seam slippage we measure. Seam slippage There are two methods: fixed opening force measurement and fixed force opening measurement. The specific test method is selected according to different testing standards and customer requirements. Seam slippage is generally only used for testing woven fabrics.

Seam Strength: As with seam slippage, use a tensile strength meter to stretch the seam at a constant rate. The force used to break the thread is the measured seam strength. The seam strength can be performed at the same time as the seam slippage. It is generally only used for testing woven fabrics.

Bursting strength: Under certain conditions, add an expansion property to a flat fabric at a suitable angle expansion force until it breaks, this force is the bursting force.

Abrasion resistance: Under known pressure, put the test specimen and standard friction cloth mounted on the specimen clamp Rub each other against each other under a certain pressure and in a certain trajectory until the fabric has the number of broken yarns or holes required by the customer. Record the number of frictions at the end of the experiment, which is the measured wear resistance value. Dimensional stability

Dimensional stability for machine washing, dimensional stability for hand washing, dimensional stability for dry cleaning, and dimensional stability for steam.

Shrinkage test Purpose: To determine the dimensional stability of woven or knitted fabrics after repeated washing in a household washing machine. 2) Principle: Before cleaning, mark the size on the sample, and measure the change in mark after cleaning to infer the dimensional change of the sample. 3) Process: Select the cleaning and drying method, cycle and drying times according to the fabric type and customer requirements, add standard cleaning agent and appropriate water level to start cleaning and drying, and then obtain the test results.

Appearance persistence

The appearance stability of water washing, machine washing, appearance stability of hand washing, appearance stability of dry cleaning

Chemical performance analysis

PH content, formaldehyde content, lead content, azo dye test, heavy metal content test, water absorption, moisture Content, odor, cotton silk finish effect, hot pressing, dry heat, storage sublimation, acid spots, alkali spots, water spots, phenolic yellowing, etc.

Formaldehyde test: Extract free formaldehyde or released formaldehyde from a certain amount of fabrics in a certain way, and then pass Colorimetric test to calculate the formaldehyde content. The specific test is carried out according to customer requirements. Fabric products can improve the wrinkle resistance of the product through resin finishing. This resin finishing agent is directly synthesized from formaldehyde, so after these A certain amount of formaldehyde will remain on the fabric after resin treatment. The cross-linking agent in the pigment printing paste and the fixing agent used after direct dye and reactive dye coloring will cause a certain amount of formaldehyde to remain on the workwear material.

pH value test: Use a pH meter to accurately measure the acidity and alkalinity of the fabric solution, and read it on the pH meter The value is the measured pH value.

Water repellent, oil repellent stain removal test: Use a certain method to test the fabric’s resistance to water, oil, and stains The measurement is mainly carried out on fabrics that have been finished with three-proof finishing.

Fire test: Place the sample on the fire tester according to regulations and burn it to see the flame spread time.

Prohibited azo dye testing: It is an important quality monitoring project in the international fabric workwear trade, and it is also an ecological fabric One of the basic quality indicators of a product, it is mainly analyzed and tested by gas chromatography. There are three methods for testing azo dyes, fabric products (fabric products except polyester and genuine leather), polyester (polyester), and genuine leather (genuine leather). Therefore, the ingredients of the product must be provided when doing the AZO test.

Ingredient analysis

cotton, linen, wool (sheep, rabbit), silk, polyester, viscose, spandex, nylon, velvet Quantity, etc.

Fiber composition analysis: First, conduct a qualitative analysis of the fibers of the fabric. There are many kinds of qualitative analysis, including combustion method, melting point method, hand visual inspection method, microscope section analysis method, etc. Generally, the microscope section analysis method is adopted, that is, using a microtome to slice the fiber and then viewing it under a microscope. Based on its appearance, the fiber type is inferred, and then different solvents are used for different fibers. Qualitative analysis to calculate the specific ingredient content.

Ecological fabric product control project: banned azo dyes, carcinogenic dyes, allergenic dyes, extractable heavy metals, five Chlorophenol, organochlorobenzene and chlorotoluene, free formaldehyde, organotin compounds, banned phthalate plasticizers, pesticides, hexavalent chromium, nickel release, total lead, total cadmium, pH value, Dyeing fastness, etc.

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AAA�Dye, allergenic dyes, extractable heavy metals, pentachlorophenol, organochlorobenzene and chlorotoluene, free formaldehyde, organotin compounds, banned phthalate plasticizers, pesticides, hexavalent chromium, nickel Release amount, total lead, total cadmium, pH value, dyeing fastness, etc.

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