How to judge the composition proportion of polyester cotton blended fabric quickly

1. Observing the appearance, we all know that polyester is a kind of chemical fiber with a smoother surface larger reflective surface than cotton. Therefore, the surface of polyester cloth is smooth has a luster of chemical fiber. Comparatively speaking, the cotton cloth is relatively matte, the polyester cloth the cotton cloth are relatively easy to separate. The yarn of polyester cotton blended fabric is made of polyester staple fiber cotton. One of the purposes is to make this kind of polyester cotton fabric have a cotton like appearance, which is difficult to judge if it is true false. If it is polyester cotton grey cloth, the more cotton on the cloth surface, the more yellow the color, the higher the cotton composition.

2. The hand feeling is different. Polyester cloth has a cool, smooth, straight cold feeling, while cotton cloth has a soft, easy to fold warm feeling. The same as above, the polyester cotton short fiber blended cloth with high cotton content is difficult to judge accurately only by hand feeling.

3. Calculate the proportion of ingredients through specifications

We have learned how to calculate the theoretical weight formula of T / C shuttle weaving before. If the fabric is t / C weft T / C weft, we can calculate the theoretical proportion of T / C cotton composition through the formula. For example: 30 * 200D / 120 * 60 twill cloth, the number of pieces converted 200D to D is 5315 / 200 = 26.6s

Theoretical weight of cloth = warp weight + weft weight

=0.1 * (warp density / 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

=144.3 g / ㎡

It can be concluded that cotton content = 91.8 / 144.3 = 63.6%

In the same way, this method can be extended to other woven fabrics with different warp weft materials.

4. Combustion method, which is the main method to judge the composition proportion of polyester cotton. Here are two concepts, one is to judge the composition, the other is to judge the proportion of the composition. Obviously, it is difficult to judge the proportion of components. The judgment proportion is realized by two pole analysis comparative analysis.

First of all, let's look at the performance characteristics of the combustion of the cotton cloth the polyester cloth. Then when the polyester cotton blended cloth in the middle burns, all the characteristics must be that the performance characteristics of the cotton cloth the polyester cloth are biased in the middle, so as to judge the approximate proportion.

Then through the comparative analysis method, further determine the proportion of components. That is to say, the ratio can be judged more accurately by comparing a cloth with a known ratio. We produce sell polyester / cotton 65 / 35 blended cloth. After the third-party chemical test, the actual proportion is polyester / cotton 65.5/34.5, which can be used as a reference for comparison. However, the proportion of conventional varieties in the market is mostly fixed specifications such as 40 / 60, 45 / 55, 65 / 35, 80 / 20, etc., which will be easier to judge.

So what characteristics should we observe when burning,

1： The smoke produced by the burning of non dyed cotton cloth is blue smoke white smoke, while polyester cloth is black smoke. The polyester cotton blended fabric is black smoke with black flying flocs. The higher the polyester content, the darker the smoke, the less flying flocs.

Black smoke burning on polyester cotton

2： Smell: the smell of cotton cloth is burning paper, the smell of polyester cloth is pungent burning glue, the smell of polyester cotton blended cloth is pungent burning glue.

3、 Burning speed state: the cotton cloth is flammable, it will continue to be accompanied with hidden sparks after extinguishment. The polyester cloth is difficult to burn, there is no spark after extinguishment. Polyester cotton blended fabric is between the two, the more bright sparks appear during combustion, the larger the area, the longer the latent burning time of Mars after extinction, the more cotton there is.

Pure cotton combustion

4、 Burning residues, non dyed cotton cloth is ash white ash, which will turn when touched, polyester cloth is hard black agglomerate, the surface is smooth. The polyester cotton blended fabric is between the two, with black hard block, the surface is smooth, rolling will be broken but fully opened, the more polyester, the harder the residue, the smoother the surface.

Observe the above aspects standard polyester / cotton 65 / 35 a known proportion comparison, you can judge the approximate composition proportion.