Keywords: dyeing material Additives sampling test Sample retention
1 introduction
My company's wax-anti-printing cloth is mainly sold to the African market . Due to its unique ethnic style characteristics , the printed cloth is required to have features such as bright color , beautiful , rough , uniform double-sided effect , and large background area , so in order to meet the market demand, improve product quality, we dyes select, test, spline, large-scale production applications and other aspects of doing a series of research and innovation, the formation of a mature management methods, including sampling, stay kind, sample test, Test production, sample room management, etc.
2 Company's regulations for the detection of dyes, auxiliaries and chemicals
In order to ensure that the quality of incoming raw materials does not affect the normal production of the workshop and the quality of finished products , according to the company’s production needs , the following regulations are specifically stipulated for the detection of dyestuffs , auxiliaries and chemicals:
2.1 Chemicals: including drugs such as acids, alkalis, and salts
(1) Appearance: Compare the color and status with the standard sample
(2) Determination of content: the percentage of active ingredients tested
The result is judged: if it is 2%, it is qualified; if it is less than the specified content, it is unqualified.
(3) Impurity components: Types and contents of impurities contained in the test
The result is judged: The impurity content is ≤ 0.5%, it is qualified; The impurity content> 0.5%, it is unqualified.
2.2 Dyeing materials: (including reactive dyes, azo dyes, coatings and other dyes)
(1) Appearance: Compare the color and status with the standard sample
(2) Reaction process: comparison of the temperature, solubility and reaction phenomenon of the material with the standard sample
Judgment of results: No abnormality is acceptable; abnormality is unqualified.
(3) Quality measurement: detection of sample-staining force, relative strength, color, color difference, salt and alkali stability
The result is judged :
a . Dyeing force and relative strength with the provisions of the difference between 2% , color ≥ 4 , color difference ≤ 1 , good stability is qualified.
b. Coloring power and relative strength below the specified 2%, color <4, color> 1, poor stability is unqualified.
(4) Various fastnesses: Test sample dry rub, wet rubbing, ironing, soaping fastness
The result is judged :
a . Dry friction ≥ 3 , wet friction ≥ 2 , ironing ≥ 3 , soaping fade> 3-4 , white cloth stained ≥ 3 , is qualified.
b. Dry rub <3, wet rub <2, ironing <3, soaping fade <3-4, white cloth stain <3, then it is unqualified.
2.3 Additives (including: pastes, soaps, fixing agents, softeners, stiffeners, etc.)
A. Finishing Auxiliaries: Softener, Stiffener
(1) Appearance: Compare the color and status with the standard sample
(2) Performance analysis: Compatible with standards, ionicity, starch formaldehyde content
The result is judged:
a. The compatibility, starch, and formaldehyde contents are basically equivalent to the standards, and they are qualified.
b. Compatibility, starch, and formaldehyde content were poorer than the standard, but failed.
(3) Quality measurement: Compared with the standard sample, its solid content, feel, yellowing resistance
The result is judged :
a . Softener solid content ≥9 . 5% (solid agent ≥ 36% solids) , hand and standard samples are basically the same , no yellowing , it is qualified .
b. Softener solid content <9.5% (solid agent content <36%), feel worse than the standard, yellowing, it is unqualified.
B. Soaping agent and fixing agent
(1) Appearance: Compare the color and status with the standard sample
(2) Performance analysis: PH value, compatibility, ionicity, solid content compared with the standard sample
The result is judged:
a. The pH value of 6-9 and compatibility are basically the same as those of the standard sample.
b. If the pH value exceeds 6-9 and the compatibility is worse than the standard, it is unqualified.
(3) Quality Measurement: Various Fastness: Tested Samples Dry, Moist, Iron, Soaping Fastness
The result is judged:
a. (fixing agent solid content ≥ 20%), dry friction ≥ 3, wet friction ≥ 2, ironing ≥ 3, soaping fade ≥ 3-4,
White cloth stained ≥ 3 grades is acceptable.
b. (fixing agent content <20%), dry rubbing <3, wet rubbing <2, rubbing hot <3, soaping fade <3-4, white cloth stain <3, it is unqualified.
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