Polyester-cotton blended fabric is a variety developed in my country in the early 20s60s , this fiber has the characteristics of stiffness, smoothness, quick drying and durability, and is deeply loved by consumers.
Polyester-cotton fabric refers to a fabric blended with polyester fiber and cotton fiber, which not only highlights the style of polyester but also has the advantages of cotton fabric.
Performance characteristics of polyester cotton
Performance characteristics of polyester fiber
As a new type of differentiated fiber material, polyester fiber has the characteristics of high strength, large modulus, small elongation, and good dimensional stability. The fiber has a soft texture, good cohesion, soft luster, and a certain Core warming effect. Polyester has poor hygroscopicity. Under normal atmospheric conditions, the moisture regain is only about 0.4%. Therefore, pure polyester fabrics feel stuffy when worn. However, the fabrics are easy to wash and dry quickly, and have “Washable and wearable“. Polyester has a higher modulus, second only to hemp fiber, and has excellent elasticity, so the fabric is stiff, wrinkle-resistant, dimensionally stable, and has good shape retention. Polyester has excellent abrasion resistance, second only to nylon, but it is prone to pilling and the pills are not easy to fall off.
Performance characteristics of cotton fiber
The cross-section of cotton fiber is irregular waist-round with a middle cavity; one longitudinal end is a closed tubular cell, which is thicker in the middle and thinner at both ends. The natural curl is a unique morphological feature of cotton fiber. Cotton fiber is resistant to alkali but not acid, and has strong absorbency. The moisture regain of cotton fiber under standard conditions is 7%~8%, and the ratio of its wet strength to dry strength is 1.1~1.15 . Cotton fiber is treated at a high temperature of 10℃ for 8h without affecting its strength. Cotton fiber decomposes at 150℃ and burns with fire at 320℃. Cotton fiber has a low specific resistance and is not prone to static electricity during processing and use.
Advantages of cotton-polyester blends
It not only highlights the style of polyester and cotton but also has the advantages of cotton fabrics. It has good elasticity and wear resistance in dry and wet conditions, stable size, small shrinkage, straightness, not easy to wrinkle, and easy to wash. , quick-drying characteristics. Moreover, it has a bright luster, feels smooth, crisp, and has a certain degree of elasticity. The creases are not obvious after being rubbed by hand and it recovers quickly. However, it also inherits the disadvantages of chemical fiber: it is prone to fluffing and balling at friction points. The fabric made of polyester-cotton blend has a thick, soft feel and is more comfortable to wear. It will not deform, wrinkle or shrink after washing.
Let’s take a look at the comparison between polyester-cotton blends and pure cotton:
Note: Fabric(The weave is plain weave)Specifications: 1#Polyester/Cotton50/50 18.3tex×18.3tex×296×228;2#Pure cotton18.3tex×18.3tex×292×226.
Strength (polyester-cotton blend>pure cotton): refer toGBT3923.1-2013“Textile Fabric Tensile Properties No. 1Part:Strip method for determination of breaking strength and elongation at break) 》Test, Clamping distance200mm, take 3 in both longitude and latitudinal directions Block test.
Abrasion resistance (polyester-cotton blend>pure cotton): refer toGBT21196-2007“Determination of Abrasion Resistance of Textile Martindale Fabrics” /span>1Part:Martindale Abrasion Tester》Test,usually depends on the yarn>
As we all know, polyester is a kind of chemical fiber with a smoother surface than cotton and a larger reflective surface. Therefore, the surface of polyester cloth is smooth and has the luster of chemical fiber. Relatively speaking, the whole cotton cloth is matte. , it is easier to distinguish between 100% polyester fabric and 100% cotton fabric. As for the polyester-cotton blended fabrics currently produced, the yarn is made from a blend of polyester staple fiber and cotton. One of the purposes is to make the polyester-cotton fabric have a cotton-like appearance.“It is difficult to judge by confusing the real”. If it is polyester-cotton gray fabric, the more cotton on the fabric and the yellower the color, the higher the cotton content.
2.The feel is different,
Polyester fabric has a smooth, straight and cold feel, while cotton fabric has a soft and easy-to-fold warm feeling. Same as above, polyester-cotton staple fiber blended fabric with a high cotton content is difficult to accurately judge based on the feel alone.
3.Calculate the ingredient ratio through specifications
before theoretical ratio. For example: 30*200D/120*60Twill fabric, 200Dconverted to D The count is5315/200=26.6S
Theoretical weight of cloth=Warp weight+Weft weight
=0.1*（经 Secret /2.54）*（583.1/warp count)
+0.1*（Weft density/2.54）*（590.5/Weft count)
=0.1*（120/2.54）*（583.1/30)
+0.1*（60/2.54）*（590.5/26.6)
=91.8+52.4
=144.3g/㎡
From this we can get the cotton content=91.8/144.3=63.6%
Similarly, this method can be extended to other woven fabrics with different warp and weft yarn materials.
4.Combustion method,
This is the main method for judging the composition and proportion of polyester and cotton. There are two concepts here. The first is to judge the composition, and the second is to judge the composition proportion. Obviously judging ingredient proportions is more difficult. Judgment of proportion is achieved through bipolar analysis and comparative analysis.
First of all, let’s look at the burning performance characteristics of all-cotton and all-polyester fabrics. Then the burning characteristics of the polyester-cotton blended fabric in the middle must be the performance of all-cotton and all-polyester fabrics. The features are skewed towards the middle to determine the approximate proportion.
Then further determine the proportion of ingredients through comparative analysis. That is to say, by comparing and burning a piece of cloth with a known proportion, you can judge the proportion more accurately. The polyester/cotton65/35 blended fabrics we produce and sell have been chemically tested by a third party and the actual proportion is Polyester/cotton65.5/34.5, can be used as a comparison reference. The proportion of conventional varieties on the market is mostly polyester cotton40/60, 45/55, There are several fixed specifications such as 65/35, 80/20, etc., which will make it easier to judge.
So what characteristics should we observe when burning?
First: smoke. The smoke produced by burning undyed cotton cloth is green smoke or white smoke, while the smoke produced by polyester cloth is black smoke. The polyester-cotton blended fabric is black smoke accompanied by black flying catkins. The higher the polyester content, the blacker the smoke and less flying catkins.
Polyester cotton burns with black smoke
Second: Smell, the 100% cotton fabric smells of burning paper, the 100% polyester fabric has a pungent smell of burning glue, and the polyester-cotton blended fabric also has a pungent smell of burning glue.
Third, the burning speed and state. All cotton fabrics are flammable and will continue to be accompanied by hidden sparks after being extinguished. All polyester fabrics are refractory to flames and will drip fire with hot melt. There will be no sparks after extinguishment. Polyester-cotton blended fabric is somewhere in between. The more bright sparks appear during burning, the larger the area. The longer the sparks remain ignited after being extinguished, the more cotton it contains.
Pure cotton burning
Fourth, the burning residue. The undyed cotton fabric is gray-white ash, which melts at the touch, while the polyester fabric is hard black lumps with a smooth surface. Polyester-cotton blended fabric is somewhere in between, with black lumps and an uneven surface. It will break when rolled but will not completely melt. The more polyester it contains, the harder the residue will be and the smoother the surface will be.
Observe the above aspects and compare them with standard polyester cotton65/35 or a certain known ratio to determine the approximate composition ratio.
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Polyester cotton burns with black smoke
Second: Smell, the 100% cotton fabric smells of burning paper, the 100% polyester fabric has a pungent smell of burning glue, and the polyester-cotton blended fabric also has a pungent smell of burning glue.
Third, the burning speed and state. All cotton fabrics are flammable and will continue to be accompanied by hidden sparks after being extinguished. All polyester fabrics are refractory to flames and will drip fire with hot melt. There will be no sparks after extinguishment. Polyester-cotton blended fabric is somewhere in between. The more bright sparks appear during burning, the larger the area. The longer the sparks remain ignited after being extinguished, the more cotton it contains.
Pure cotton burning
Fourth, the burning residue. The undyed cotton fabric is gray-white ash, which melts at the touch, while the polyester fabric is hard black lumps with a smooth surface. Polyester-cotton blended fabric is somewhere in between, with black lumps and an uneven surface. It will break when rolled but will not completely melt. The more polyester it contains, the harder the residue will be and the smoother the surface will be.
Observe the above aspects and compare them with standard polyester cotton65/35 or a certain known ratio to determine the approximate composition ratio.
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