The main function of the desiccant is to prevent moisture, so the breathability of each small bag is the key. How to choose a packaging material that is breathable and firm?
Shanghai uses here to list some of the characteristics of packaging materials, and recommend packaging materials used in some industries.
Filter paper
Filter paper, also called cotton paper, coffee filter paper, tea filter paper, is the earliest used packaging material in China.
- Good air permeability and average firmness.
- cheap price
non-woven fabric
Non-woven fabrics, also known as non-woven fabrics, are a kind of fabric that is processed by needle rolling machinery or carding machinery to process various fiber raw materials and is formed or bonded by high pressure. In other words, it is actually similar to the chemical fiber clothes we usually wear, except that it has not been woven. Commonly used raw materials are PE (polyethylene) or PP (polypropylene).
- Good breathability and good firmness.
- Medium price
- Printing is slightly blurred
Composite paper
There are many types of composite paper. Some composite paper has filter paper on the outside (printing surface) and non-woven fabric or PE film on the inside. There are also bleached kraft paper on the outside and non-woven fabric + PE + reinforcing thread on the inside. In short: the thicker the composite paper, the higher the fastness, the poorer the air permeability. vice versa.
- General air permeability and good firmness.
- Medium price
- The bag is a bit hard
OPP
OPP is a transparent packaging material.
- General air permeability and good firmness.
- Medium price
- Transparent packaging, you can see the desiccant raw material inside, used with the color change indicator raw material, and observe the water absorption.
Dupont Tyvek
Tyvek, whose Chinese translation is called "Tyvek", is an olefin material developed by DuPont in 1955 and is made of high-density polyethylene fiber. Tyvek has extremely strong tensile and shear resistance. It combines the advantages of paper, cloth and plastic film. It has the characteristics of light, thin, soft, smooth and tough, waterproof, and not easily deformed. It has more balanced physical properties and is used in structural construction and printing. , Medical packaging, protective clothing and other products, is a new type of application materials.
- General air permeability and excellent firmness.
- Expensive
- Anti-static and no dust leakage
- For medical packaging, and industrial antistatic packaging
- Not resistant to high temperature above 100℃
Teijin long fiber non-woven fabric (Unisel)
Unisel is a PP (polypropylene) + PE (polyethylene) synthetic material developed by Teijin Japan. Unisel has the characteristics of non-woven fabric: soft, breathable, and can withstand high temperatures of 150 ℃. Its tensile and shear resistance is extremely strong, even the scissors are difficult to cut.
- Very high air permeability and excellent firmness.
- Expensive
- High sealing strength
- Flat and smooth surface, clear printing
- Can withstand 150℃ high temperature
- Powder leakage