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Basic knowledge of desiccant(2)
1.2Introduction of package materials
Tyvek
Made of PE material. Super high tear strength, tensile strength, excellent dustproof, good air permeability, excellent antibacterial properties. High-cost.
Reticulated paper
The reticulated paper is made up of three layers of material: outer fibrous paper, middle PET reticulate rib, and inner PE film. It has high tear strength and tensile strength, excellent dustproof property, poor permeability and easy to be punctured.
Ordinary nonwoven fabric
PET spunbonded non-woven fabric, spray PE glue.
Tear strength, tensile strength and sealing strength are all general, permeability is very good, and the price is low.
Material name | tear strength | Tensile strength | Sealing strength | Dustproof | Permeability | cost |
Tyvek | good | good | commonly | good | good | high |
Reticulated paper | good | good | commonly | good | bad | secondary |
nonwoven fabric | commonly | commonly | commonly | commonly | good | good |
1.3Introduction of barrier packing materials
Metal and glass containers can completely block water vapor, while other materials such as PE bags and composite bags can not.
In order to determine a reasonable shelf life, a suitable barrier bag must be selected when desiccant packaging.
In other products packaging, we also need to consider the use of barrier bags, which involves the calculation of desiccant dosage.
Different barrier packaging bags have different water vapor barrier properties. Water vapor transmission rate (WVRT) is the most commonly used index to describe this performance.
Barrier packaging water vapor transmission rate list
Material name | HDPH bag | LDPE bag | MDPE bag | Compound bag(PA/PE,PET/PE) | Aluminum foil bag(PET/AL/PE) | |
Thickness mm | 0.05 | 0.1 | 0.2 | 0.14 | 0.1 | 0.1 |
WVTR g/m2.d | 约1.8 | 1 | 0.5 | 0.35 | 1.1 | <0.1 |
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