Textile Knowledge Distribution: There Are A Series Of Strict Requirements For Wool Sampling And Testing.

1. sampling process for Australian wool

The most advanced content of the wool industry in Australia is the sampling and subsequent testing of wool.

Australian wool implements bag sampling.

It can be imagined that the annual workload of testing millions of wool packets is enormous.

In order to ensure the authenticity of the test, wool sampling

Australian wool sampling is divided into two broad categories.

The first is core drilling.

Almost one hundred percent of Australian wool is subject to such sampling.

Because of the huge workload of sampling, Australia's wool industry has developed fully automated sampling machinery.

The principle of core drilling is to insert the drill pipe from the top of the wool bag into the wool bag.

Because the wool bag is extruded under the action of the machine, the drill pipe can be inserted into all layers of the bag and the sample is removed.

According to international Wool Textile Organization (IWTO) drilling core sampling requirements, each batch of sampling weight of 1000 grams.

Core drilling samples will be used to detect fiber fineness, cleaning rate and grass impurity content.

This figure is the present wool.

Unlike other countries, wool sampling is based on core sampling.

The so-called sample grabbing is the random sampling of a number of intact wool samples in the wool bag.

According to the provisions of the International Wool Textile Organization, the sample weight of sample grabbing is 6 kg per sales volume.

There are two uses for such samples. One is to take two further samples in the samples taken from the samples, and finally to prepare at least 60 bristles. The wool cluster is detected by special equipment to get the data of the length, intensity and the percentage of the broken parts, so as to evaluate the quality of the wool more scientifically.

As for the use of these test results, we will give a detailed explanation in the following chapters. Two, display the wool clusters in the specially designed wool exhibition hall, so that the personnel who purchase wool can not only get all kinds of testing data of Australian wool, but also check the real condition of the corresponding raw wool with these data, including the shape, color and other characteristics of wool.

It needs to be emphasized again that the coverage of Australian core drilling is 100%, while that of sampling is about 80%.

This is due to the fact that the detection equipment is not able to detect the strength of the woolen bushes shorter than 55 mm, but most of the side bristles are relatively short, so it is impossible to detect the fur of 100% Australian wool.

The samples were sent to the AWTA in Melbourne and Western Australia for testing after being bagged and sealed by AWTA at the scene.

2. Australian wool detection

1) testing of core drilling samples.

Every batch of Australian wool sold on the market will remove 1000 grams of samples by drilling core sampling.

This sample will be used for the detection of wool base, fineness and grass base. Once the content of hair base is determined, the washing rate can also be calculated.

The concept of "Mao Ji" is to determine the content of pure fiber in raw wool.

As we all know, raw wool usually contains fiber, water, grease, ash and grass.

Wool traders are concerned about fiber content, so judging wool base is one of the most important concerns.

However, in real life, absolutely pure fiber is "invisible, unable to touch".

However, through different kinds of experimental methods, we can define and eliminate all kinds of non fiber components in raw wool, so as to get the pure fiber content theoretically.

The specific methods are:

I) the samples of 1000 grams were divided into two parallel 150 grams of samples after full mixing.

According to the provisions of the International Wool Textile Organization, the two 150 grams of samples must undergo the same test, and then the accuracy of the test will be judged according to the error and the results will be issued.

The remaining 700 grams of wool is known as "archival hair" and preserved.

If the results of the two parallel tests are beyond the scope of the error tolerance, the testing center will further sample and repeat the test from the "file hair".

II) 150 grams of raw wool wool samples were washed by imitation industrial method.

Wash and dry thoroughly, then dry in a 105 degree oven.

The fibers are weighed instantaneously after being thoroughly dried.

By this way, the moisture content in the raw wool can be accurately determined.

At this time, the weight is discharged from the weight of the washed wool.