Definition of dry heat shrinkage rate: Under specified conditions, measure the length change of the sample before and after dry hot air treatment, and calculate its dry heat shrinkage rate. Dry heat shrinkage test principle: Using a dry heat shrinkage instrument or a thermal cycle oven, in hot air at a constant temperature, after a specified time, measure and calculate the pre-tensioning of the dipped yarn, cord and cord. Dry heat shrinkage rate, dry heat shrinkage force and free dry heat shrinkage rate of dipped yarn, the testing instrument recommends Changzhou Shuanggu Dunda Electromechanical Technology Co., Ltd. to independently produce SG625 dry heat shrinkage tester.

Applicable standards: HG/T 2821.2-2012 Dipped polyester cords for V-belts and V-ribbed belts - Part 2: Types of industrial filaments for flexible cords, test conditions, heat treatment temperature, °C, test length, heat treatment time, s, unit linear density, pretension, cn /dtex Test conditions for dipped polyester cords per package test times - 150±1 250mm 180 (3 minutes) 0.02±0.002 1 GB16604-2017 Polyester Industrial Filament Test Conditions Heat Treatment Temperature ℃ Heat Treatment Time s Unit Linear Density Pre-addition Tension cn/dtex Test length Number of test samples Test times per sample Test condition one 177±1 120 (2 minutes) 0.05±0.001 250mm 20 1 Test condition two 190±1 300 (5 minutes) 0.01±0.001 250mm 20 1 GB /T 30312-2013 Test method for heat shrinkage of dipped yarn, cord and cord GB T 9101-2017 Nylon 66 dipped cord fabric

Industrial Filament Type Test Conditions Heat Treatment Temperature °C Test Length Heat Treatment Time s Unit Linear Density Pre-tension cn/dtex Test Times per Package Nylon 66 Dipped Cord Test Conditions - 160 250mm 120 (2 minutes) 0.05±0.005 1 if The customer uses the oven method to test, the temperature is 150 ℃ ± 2, the heat treatment time is 30 minutes, the length of the sample is 1 meter, and the length of the sample is measured after placing it in a constant temperature room for 1 hour. GB∕T 36020-2018 Test method for chemical fiber dipped cords Test conditions Heat treatment temperature ℃ Heat treatment time s Unit linear density Pretension cn/dtex Test length Test times per sample Dipped nylon 6 cords 160±2 120 (2 minutes) 0.05±0.005 250mm±1mm > 5 times dipping nylon 66 cord 177±2 120 (2 minutes 0.05±0.005 250mm±1mm > 5 times dipping polyester cord 177±2 120 (2 minutes) 0.05±0.005 250mm ±1mm >5 times dipping para-aramid cord 177±2 120 (2 minutes) 0.2±0.01 250mm±1mm >5 times FZ/T 54013 Nylon 66 Industrial Filament Test Conditions Heat Treatment Temperature ℃ Heat Treatment Time s Unit Line Density Pretension cn/dtex Test Length

Number of test samples Test conditions for each sample Test conditions 177±1 120 (2 minutes) 0.05±0.005 250mm 20 1 FZ/T54022-2019 Colored polyester industrial filament test conditions Heat treatment temperature ℃ Heat treatment time s Unit linear density pretension cn/dtex Test length, number of test samples, number of tests per sample, test condition one 177±1 600 (10 minutes) 0.05±0.001 250mm 20 1 Test condition two 190±1 900 (15 minutes) 0.01±0.001 250mm 20 1 FZ/ T54044-2011 Nylon 6 Industrial Filament Test Conditions Heat Treatment Temperature ℃ Heat Treatment Time s Unit Linear Density Pre-tension cn/dtex Test Length Test Samples Number of Tests per Sample Test Condition One 160±1 120 (2 minutes) 0.05±0.005 250mm 20 1 FZ/T 50050-2020 Test method for dry heat shrinkage of synthetic fiber industrial filaments