Views: 4 Author: Site Editor Publish Time: 2022-02-09 Origin: Site
"Polyester-cotton" and "cotton-polyester", the order of the two words changed into two different fabrics.
"Polyester-cotton" (TC) fabric means that the composition of polyester accounts for more than 50%, and the composition of cotton is less than 50%;
Advantages: The gloss is brighter than pure cotton, the hand feels smooth and crisp, and it is not easy to wrinkle, and the higher the polyester composition, the less likely the fabric will wrinkle.
Disadvantages: The skin-friendly is not as comprehensive as it is, and it is not comfortable to wear without comprehensive fabrics.
"Cotton polyester" (CVC) is just the opposite, which means that the composition of cotton is more than 50%, and the composition of polyester is less than 50%, also known as CVC varieties.
Advantages: The luster is slightly brighter than pure cotton cloth, the cloth surface is flat, clean without yarn ends or impurities. It feels smooth and stiff, and is more wrinkle-resistant than cotton.
Disadvantages: The skin-friendly is not as comprehensive as it is, and it is not comfortable to wear without comprehensive fabrics.
1. Looking at the appearance, we all know that polyester is a kind of chemical fiber, the surface is smoother than cotton, and the reflective surface is larger. Therefore, the surface of all-polyester cloth is smooth and has the luster of chemical fiber. Relatively speaking, all-cotton cloth is relatively matte, Polyester and cotton are relatively easy to distinguish. And the polyester-cotton blended fabric produced now, the yarn is blended with polyester staple fiber and cotton, one of the purposes is to make the polyester-cotton fabric have a cotton-like appearance, and it is difficult to judge the "fake and real". If it is a polyester-cotton grey fabric, the more cotton on the fabric, the more yellow the color, and the higher the cotton composition.
2. The hand feel is different. Polyester cloth has a smooth, straight and cold feeling, while cotton cloth has a soft, easy-to-fold and warm feeling. Same as above, polyester-cotton staple fiber blended cloth with high cotton content is difficult to judge accurately by hand feeling alone.
3. Calculate the composition ratio from the specification
We have learned how to calculate the theoretical gram weight calculation formula of polyester-cotton woven fabric before. If the fabric is full polyester in warp and weft yarn or full polyester in warp and weft yarn, we can calculate the theoretical ratio of polyester-cotton fabric composition through the formula. For example: 30*200D/120*60 twill, the number of 200D converted to D is 5315/200=26.6S
Theoretical gram weight of cloth = warp yarn weight + weft yarn weight
=0.1*(Warp density/2.54)*(583.1/Warp yarn 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, it can be concluded that the cotton content=91.8/144.3=63.6%
In the same way, this method can be extended to other woven fabrics with different warp and weft materials.
4. Combustion method, this is the main method for judging the composition and proportion of polyester and cotton, here are two concepts, the first is to judge the composition, and the second is to judge the proportion of the composition. Obviously, it is more difficult to judge the proportion of ingredients. Judgment ratio is achieved through the bipolar analysis method and the comparative analysis method.
First of all, let's look at the performance characteristics of the combustion of cotton and polyester. Then the characteristics of the polyester-cotton blended fabric in the middle are definitely biased in the middle of the performance characteristics of cotton and polyester. , so as to determine the approximate ratio.
Then through the comparative analysis method, the proportion of components is further determined. That is, by comparing and burning a cloth with a known proportion, the proportion can be judged more accurately. The polyester/cotton 65/35 blended fabric we produce and sell has been chemically tested by a third party, and the actual ratio is polyester/cotton 65.5/34.5, which can be used as a comparison reference. The proportion of conventional varieties on the market is mostly polyester-cotton 40/60, 45/55, 65/35, 80/20 and other fixed specifications, so it will be easier to judge.
So what characteristics do we have to observe when burning
First: smoke, the smoke produced by the burning of undyed cotton cloth is blue smoke or white smoke, while the polyester cloth is black smoke. The polyester-cotton blended fabric is black smoke with black flying floc, the higher the polyester content, the darker the smoke and the less flying floc.
Polyester cotton burns with black smoke
Second: the smell, the cotton cloth has a burning paper smell, the polyester cloth has a pungent burning glue smell, and the polyester-cotton blended fabric also has a pungent burning glue smell.
Third, the burning speed and state, the cotton cloth is flammable, and it will continue to be accompanied by igniting sparks after it is extinguished. The polyester-cotton blended fabric is between the two. The more bright sparks appear when burning, the larger the area, and the longer the sparks smouldering time after extinguishing, the more cotton it contains.
Pure cotton burning
Fourth, burning residues, non-dyed cotton fabrics are off-white ash, which melts when touched, while polyester fabrics are hard black lumps with a smooth surface. The polyester-cotton blended fabric is between the two, with black hard lumps, and the surface is not smooth. It will be crushed but not completely melted by rolling. The more polyester it contains, the harder the residue and the smoother the surface.
By observing the above aspects and comparing with the standard polyester-cotton 65/35 or a known ratio, the approximate composition ratio can be judged.
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