The first towel in the world was born in 1850 and originated in Britain. It has a history of more than 170 years. From the simplest monochrome plain wool towel at the beginning to the present Satin Edge, satin file, jacquard, printing, twist free towel, cut pile towel, etc., it is one of the textile products with the fastest development speed.
In short, the weight of the towel is the main factor, and the specification is the secondary factor. The primary and secondary factors meet the demands of the buyer and the seller.
In recent years, with the occasional appearance of the square gram weight of towels, the original simple and practical trading demands have become complicated. Then, why is this square gram weight so brain burning?
In order to further clarify the square gram weight of the towel, let's first look at the description of a purchase order of a hotel: square towel, 35 * 35cm (after washing), 65g (before washing), square gram weight 530.61g/m2 (after washing). The seemingly ordinary requirements are actually ambiguous.
Generally speaking, the square gram weight of textiles refers to the mass per unit area of the products. There are two methods to test the square gram weight:
According to methods 1 and 3 of GB / t4669-2008, the fabric is humidified in the standard atmosphere. After the humidification, the length, width and mass of the towel fabric are measured, and the humidification mass per unit area is calculated.
According to method 5 of GB / t4669-2009, the fabric is humidified in the standard atmosphere, and the sample is cut and weighed according to the specified size to calculate the humidification mass per unit area.
Most of the hotel towels are customized products. Behind the changes in specifications, weights and other requirements, there are a lot of complicated towel design and data calculation, as well as process technology adjustment. The seemingly simple hotel towel is not simple at all. Are the above two methods applicable to hotel towel fabric?
Assuming that the test is conducted according to the first method, four groups of data will appear.
Assuming that the second method is used for testing, it is necessary to remove the Satin Edge, satin stop, embroidery and other parts of the fabric that are significantly different from the mass per unit area of the fabric body, and cut the representative sample, that is, the loop part.
There are three uncertainties in this method:
The fabric organization on the towel includes plain cloth, Terry, satin, satin edge, jacquard (large pattern, small pattern), etc. it is a combination of many kinds of organizations. No matter how complex the combination is, the yarn weight and square gram weight can be calculated by the yarn amount. However, it is relatively complicated to calculate the yarn amount of the terry part separately.
Compared with the towel loop part, the square gram weight of the non towel loop part is larger. The weight of the towel strip calculated by the square gram weight of the loop part will be smaller than the actual strip weight.
This test method is to cut the sample with a cutter at the appropriate position of the towel fabric. During the cutting process, the wool loop of the towel is damaged. The damaged and dropped wool loop will affect the accuracy of the weight of the sample.
The above conclusion is not a small compilation of "insights", it is based on the insights of many experts of the home textile standards committee. This conclusion is also confirmed in the national standards of relevant products? In fact, the topic we are discussing today has been fully discussed and unified when the relevant standards were formulated.
Therefore, in the standard GB / t22800-2009 textiles for star rated tourist hotels, the three indicators of strip weight, specification and square gram weight discussed above only assess strip weight, while the other two indicators are not required. It is specified in the standard that the weight of towel strips is equal to the weighted average of 10 weighed towels, and the deviation rate of qualified products is allowed to be greater than - 3.5%.
The above are purely personal views. I hope that all experts and scholars will criticize and correct me!