Dry cleaning fastness is one of the important indicators for assessing the wearability of textiles. GB/T 5711-1997 "dry fastness fastness" test for textile color fastness stipulates an important test method for textile color fastness to dry cleaning. It is widely adopted by China's relevant product standards. It was issued in September 11, 2015 and implemented in June 1, 2016. The revised standard is more in line with the development needs of the industry and is of great practical value. This article analyzes the major changes in the revised standard contents, which helps to promote the new standards and help the experimenters to carry out the inspection work better.

I. major changes

1.1 standard name

The standard name is revised from the "dry fastness fastness to dry cleaning" of textile color fastness experiment to "fastness to dry fastness of four vinyl chloride" in textile color fastness experiment. The new standard clearly sets the title of four vinyl chloride, so that the standard application scope is more clear, easy to find and use.

1.2 test principle

The new standard has revised the testing principle. The details are shown in Table 1.

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The textile samples and stainless steel sheets were put into cotton cloth bags and stirred in vinyl chloride. Then the samples were extruded or centrifuged to remove the liquid and dried in hot air. The discoloration of the samples was evaluated by using a gray card to evaluate discoloration. At the end of the experiment, the filtered solvent was compared with the blank solvent by transmission light, and the color of the solvent was evaluated by grey card.

The textiles were bonded together with the prescribed lining fabric and placed in a cotton cloth bag with stainless steel sheets and stirred in four vinyl chloride. Then the sample and the lining fabric were extruded or centrifuged to remove the liquid.

As shown in Table 1, the testing principles of the new version have changed as follows:

1.2.1 test samples

The test sample added the required lining fabric, and the change of samples was mainly to adapt to the change of rating.

1.2.2 rating objects

The new revision of the standard adopts ISO 105-D01:2010 "textile fastness: part D01: color fastness to dry cleaning of four vinyl chloride". The standard lining fabric is used to evaluate the color fastness to dry cleaning of the sample, replacing the previous assessment of the color grading of the reagent after dry cleaning. Another method of testing the standard AATCC TM 132 used by the American textile chemist and the association of coloring experts has also adopted this method.

1.2.3 rating method

It has increased the color and stain of the instrument.

1.3 safety warning

Four vinyl chloride is one of the commonly used dry cleaning agents for textiles. However, the substance has stimulant and anesthetic effects. After inhalation, acute poisoning has irritation on the upper respiratory tract, and chronic effects may lead to fatigue and vertigo. If there are no protective measures, repeated skin contact can cause dermatitis and eczema. Dry cleaning fastness is a routine test item. The experimenters will be exposed to a large amount of work. This chapter increases the toxicity of four vinyl chloride and the correct operation method, which is conducive to protecting the health and safety of the experimenters.

1.4 reagents and materials

(1) as a result of the change of testing principle, the chapter on reagents and materials has correspondingly increased the requirements for lining fabrics. The new standard can choose multi fiber liners and single fiber linings to maintain consistency with international standards.

(2) the size requirements of undyed twill have been removed, and the final sample bag size is only required in the seventh chapter sample, which reduces the waste of two tailoring and consumables.

1.5 equipment

(1) in this chapter, the ventilation cabinet requirements are increased, and the ventilation cabinet is included in the equipment required by the standard so as to make it a necessary condition for testing and ensure the health of the experimenters.

(2) increased the use of instruments for rating purposes, which is appropriate for the change of rating methods.

1.6 sample

Due to the change of testing principle, the corresponding standard sample preparation method has been revised.

1.6.1 fabric samples

When the sample is made of fabric, the front is stitched with a piece of multi fiber liners or sandwiched between two single fiber lining fabrics to form a combined sample.

1.6.2 yarn or loose fiber

Yarns can be woven into fabrics, and samples are prepared according to fabric. For testing yarn or loose fiber, the yarn or dispersion fiber is about half the total quality of the lining fabric. The new standard provides for the sampling quantity of yarn and bulk fiber, which avoids the test deviation and quality disputes caused by different sampling quantities.

1.7 operation procedure

(1) increase the inspection links before the experiment to ensure that the inner, cover and sealing devices of the stainless steel vessels are dry, so as to prevent leakage or interfere with the experimental results due to moisture interference.

(2) increased the regulations for injecting liquid and taking out samples in the ventilation cabinet, and deleted the old version of "drying the sample in hot air at a temperature of 60 degrees and 5 degrees Celsius", and changed it to dry in suspension. The operation in the ventilator can prevent some poisonous vapors, gases and particles from spreading, so as to avoid the inhalation of laboratory staff.

Two, suggestions

The new version of the standard has more detailed provisions in terms of safety. In order to avoid sudden emergencies, it is hoped that the following two points will be included in the next revision: first, set up eye washing and safety shower devices near the operating platform; two, it is necessary first aid measures, for example, when skin contact is contacted, remove clothes and wash with soap and water in time. When inhaled, leave the scene quickly and move to the fresh air.

Three. Conclusion

In the commercial dry cleaning process, there is often a mixture of multi colored clothes. Therefore, it is common that the dyes from the clothes are polluted by other dyes. The color of the standard lining fabric can be used to evaluate the impact of the falling dyes on the clothing, and the suitable ingredients or materials can be selected according to the color of the lining fabric.The revised standards are more in line with the development needs of the industry, while maintaining consistency with international standards, which is conducive to the import and export trade of China's textile products.

(source: light industry standards and quality, 2016 second issue)