Textile perspiration color fastness tester saliva color fastness test
GB/T18401-2010 "National Basic Safety Technical Specifications for Textile Products" stipulates that infant textile products need to be assessed for saliva color fastness. Saliva color fastness refers to the degree of color retention of textiles under the action of artificial simulated saliva.Textile perspiration color fastness tester can conduct this experiment.
Infants and young children like to suck and chew clothes. Under the biochemical action of proteases in human saliva, saliva will promote the decomposition of dyes, which may ingest harmful substances in dyes into the baby's body through the mouth, causing damage to the health of infants and young children. Therefore, saliva color fastness is a color fastness test item specially added for infant clothing.
Shanghai Qianshi Precision Electromechanical Technology Co., Ltd. was established in 2012. It focuses on the research and development, design, and production of textile testing instruments, and provides textile testing instruments and services for academic research units and testing institutions. Shanghai Qianshi is currently one of the most competitive R&D textile testing instrument manufacturers in China. The R&D team is composed of a group of experienced engineers. We are committed to serving customers wholeheartedly and striving to promote technological innovation in textile testing instruments.
Principle of test:
The sample is placed together with the specified adjacent fabric, placed in artificial saliva, and then the excess test solution is removed. The sample is placed between two plates in the test device and a specified pressure is applied. The sample and the adjacent fabric are kept for a certain period under specified conditions. The sample and the adjacent fabric are then dried separately. The discoloration of the sample and the staining of the adjacent fabric are evaluated with a gray sample card or instrument.
Sample preparation:
1. For fabric samples, prepare the sample according to one of the following methods:
a) Take a (100±2)mm*(40±2)mm sample and contact the front side with a (100)*(40)mm multi-fiber adjacent fabric to form a combined sample.
b) Take a (100±2)mm*(40±2)mm sample and sandwich it between two (100±2)mm*(40±2)mm single-fiber adjacent fabrics. The samples are sewn along the short sides to form a combined sample.
2. For yarn or loose fiber samples, take the mass of yarn or loose fiber equal to about half of the total mass of adjacent fabric, and prepare a combined sample by one of the following methods:
A) Sandwich between a piece of (100±2)mm*(40±2)mm multi-fiber adjacent fabric and a piece of (100±2)mm*(40±2)mm undyed fabric, sew along four sides to form a combined sample.
B) Sandwich between two pieces of (100±2)mm*(40±2)mm specified single-fiber adjacent fabric, and sew along four sides to form a combined sample.
Adjacent fabric:
The adjacent fabric used for the test can be selected from single-fiber adjacent fabric or multi-fiber adjacent fabric.
Single-fiber adjacent fabric: If the sample is a pure textile fabric, one adjacent fabric is made of the same fiber as the sample and two adjacent fabrics are made of the specified fiber. If the sample is a blended or interwoven product, one adjacent fabric is made of the main content fiber and two adjacent fabrics are made of the secondary fiber.
Multifiber interlining (DW type): The main components are diacetate, cotton, nylon, polyester, acrylic, and wool.
Test device:
The test device consists of a stainless steel frame and a weight of about 5kg and a bottom area of 115mm*60mm; and a glass plate or acrylic resin plate of about 115mm*60mm*1.5mm. When the combined sample of (100±2)mm*(40±2)mm is sandwiched between the plates, the combined sample can be subjected to a pressure of (12.5±0.9)kPa. The structure of the test device should ensure that the pressure on the sample remains unchanged after the weight is removed during the test.
Artificial saliva preparation:
2002 version test solution preparation: The test solution is prepared with grade 3 water and is ready for use. Each liter of solution contains 3.0g of lactic acid, 0.2g of urea, 4.5g of sodium chloride, 0.3g of KCl, 0.3g of sodium sulfate, and 0.4g of ammonium chloride.
Preparation of the 2019 version of the test solution: The test solution is prepared with grade 3 water and is ready for use. Each liter of the test solution contains 0.17g of magnesium chloride hexahydrate, 0.15g of calcium chloride dihydrate, 0.76g of hydrogen phosphate trihydrate, 0.53g of potassium carbonate, 0.33g of sodium chloride, and 0.75g of KCl. Use a 1% hydrochloric acid solution to adjust the pH value of the test solution to 6.8±0.1.
Dissolve the specified amount of potassium salt and sodium salt in 900mL of grade 3 water, add magnesium chloride and calcium chloride, and stir continuously until they are completely dissolved. Immerse the calibrated pH meter electrode in the solution, slowly add 1% hydrochloric acid solution, and stir gently to make the pH of the solution reach 6.8±0.1. Add grade 3 water to make up to 1000 mL, shake well, and store away from light.