The towel for brain burning weighs square grams, enough for you to drink a pot!

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.

  Towel is a fabric with loop structure, which is made of three system yarns interwoven with each other. The yarns of these three systems are wool warp, ground warp and weft. Most of the hotel towels are woven towels. In addition to the material and yarn count, there are also requirements for the weight of the front strip and the specifications after washing. The weight of the front strip is an important indicator of the contract, and the specifications after washing are an auxiliary indicator. The sales price of towels is equal to the weight of towel strips multiplied by the unit price per gram. Although the specification of towels has nothing to do with the price, it is related to the appearance and visual effect and the heavy hand feel of towels. The specifications of towels are divided into two dimensions: before washing and after washing. Most of the purchase dimensions of hotels default to the size after washing. According to the characteristics of the towel structure and the weaving process, the absolute difference between the size of the towel before and after washing in the weft direction (width) is 1-2cm, and the difference between the size of the towel before and after washing in the warp direction (length) is 5-6%. The towel size is an auxiliary factor, as long as the previous and subsequent batches are basically consistent.

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:

Method 1

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.

Method 2

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. In the table, data 2 and 3 belong to the same dimension. Data 2 is consistent with the real transaction, and there is no problem with the independent existence of the two data. However, when it is associated with the square gram weight, due to the particularity of towel tissue, it is easy to deform after washing, so there is great uncertainty in the measurement of length and width. Therefore, there is a large deviation in the square gram weight. Data 3 has no practical significance; Data 1 and 4 belong to the same dimension. Data 1 can be accurately tested, but it is not practical; Data 4, no practical significance.

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:

one

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.

two

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.

three

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. To sum up, no matter which test method is used to determine the square gram weight of towels, it lacks scientificity, rationality, practicality and feasibility. It should not be used as an important indicator of the transaction. It can be used as an auxiliary indicator together with the towel specification. It is not suitable to pass the measurement assessment for the time being.

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%. No matter whether you understand the above description or not, in order to reduce the ambiguity between the two sides of the transaction, remember one point: try not to use the square gram weight index; Even if it is adopted, it should not be used as an assessment indicator; It must be used, and it is required to be used as an assessment indicator. It must be sealed for comparison. Otherwise, for both sides of the transaction, it will be a pot of raw rice, waiting to cry!

The above are purely personal views. I hope that all experts and scholars will criticize and correct me!