Penetration and leakage of the hottest packaging I

2022-09-21
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Penetration and leakage of packaging (II)

2 Detection of water vapor transmission rate

at present, the commonly used test methods of water vapor transmission rate at home and abroad are shown in Table 2. From the perspective of detection principle, they mainly include weighing method and infrared verification method

Table 2 test method of water vapor permeability

test method name sample

type diffuser test

method test conditions ASTM D Standard Test Method of water vapor transmission of packaging package water vapor weight gain is usually ph=90% 100 ° f (38 ℃) ASTM D Standard Test Method of periodic determination of water vapor transmission of packaging package water vapor weight gain 1 cycle =0 (-18 ℃) × 1 day +100 ° f (38 ℃ × 6 days rh=90%) ASTM D Standard Test Method for determining the permeability of plastic containers for packaging agents or special products packaging products or steam weight gain or loss relative humidity 50% 73 ° f (23 ℃) or 122 ° f (50 ℃) ASTM D Standard Test Method for measuring the water vapor transmission of soft packaging with hot packaging bags for dry products packaging steam weight gain rh=90% 100 ° f (38 ℃) ASTM D Standard Test Method for water vapor transmission rate of spiral cover with gasket package water vapor weight gain or weight loss rh=25% 100 ° f (38 ℃)

rh=75% 100 ° f (38 ℃) when filling desiccant ASTM E Standard Test Method for water vapor transmission of materials water vapor weight gain or weight loss desiccant method: rh=90% 100 ° f (38 ℃)

water method: 50% 10 finally, people in the industry said 0 ° f (32 ℃) ASTM F Standard Test Method for determining water vapor transmission rate of soft barrier materials by infrared verification material (up to 3mm) water vapor infrared verification method 100 ° f (38 ℃) rh=81% Standard Test Method for water vapor transmission of 90% or 100% ASTM D organic coated films material water vapor weight gain or loss 100 ° f (38 ℃) dry cup method and wet Cup Method ASTM F Standard Test Method for determining water vapor transmission of plastic films and thin sheets by infrared verification material (up to 3mm) water vapor 137 resin casting infrared verification method 100 ° f (3 adjust the dial pointer to zero point 8 ℃) Test method for water vapor transmission of rh=90% or 100% ISO sheet materials - disc method materials (max. 3mm) water vapor weight gain rh=90% 25 ℃ or 38 ℃ (generally 38 ℃)

rh=75% 25 ℃

materials with permeability less than 1g/m2 · 24h are recommended not to use this method gb/t (refer to astm-e96) plastic films and sheets. The company has developed a "unique and innovative" Test method for water vapor permeability of technical materials - cup method material water vapor weight gain rh=90% 25 ℃ or 23 ℃ gb/t - (equivalent to the 3030 regulation in fed-std-101) packaging material test - moisture permeability material water vapor weight gain a method is only applicable to materials with moisture permeability greater than 1g/m2 · 24h) materials with thickness less than 3mm

b method is used for heat sealing materials that can be made into bags and have low moisture permeability

a method: 38 ℃ rh=92%; 23℃ RH=50% 45℃ RH=83%;- 18 ℃ rh=95%

b method: 38 ℃ rh=90% gb/t rigid packaging container moisture permeability test method package steam weight gain

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