Catalyst PE Square Bottom Valve Bag

In terms of packaging design, Catalyst PE Square Bottom Valve Bag need to take into account the chemical properties of catalysts, such as moisture resistance, pollution prevention, and corrosion resistance. Their advantages and size selection have both similarities with ordinary water-soluble fertilizer square-bottom bags and optimizations targeting the characteristics of catalysts. The following is a detailed introduction.

1. Targeted Protective Performance

It has high barrier properties. It uses multi-layer co-extruded PE materials, such as PE+EVOH composite films, which can effectively block oxygen, water vapor, and external pollutants. This prevents the catalyst from deactivating due to moisture absorption, oxidation, or contact with impurities, and is especially useful for sensitive catalysts such as precious metal catalysts and molecular sieves.

The chemical resistance of PE material is also good. It is inert to most acids, alkalis, and organic solvents, and can resist the erosion of volatile gases that may be generated by the catalyst. This prevents the bag from being damaged or the dissolution of impurities from affecting the performance of the catalyst.

There is also an anti-static design. Some catalysts, such as powder catalysts, are prone to generating static electricity due to friction. The square-bottom bag can be added with anti-static masterbatch to reduce dust adsorption and the risk of static sparks, making storage safer.

2. Structural and Functional Advantages

It has good stability and load-bearing capacity. The square-bottom structure makes the bag highly upright, which is convenient for stacking in the warehouse, with a stacking height of 3-5 layers. Moreover, the bottom adopts a reinforced heat-sealing process, and the load-bearing capacity can reach 20-100kg. Ordinary water-soluble fertilizer bags usually have a maximum of 50kg, so it is suitable for packaging large doses of catalysts.

In terms of sealing and re-opening design, in addition to conventional heat sealing, a zippered seal or one-way exhaust valve can be added. This makes it convenient for small-dose access in laboratories or multiple feedings in industrial production, while maintaining the sealing effect.

Considerations are also given to dust prevention and visualization. The surface of the bag can be covered with a matte or glossy PE film to reduce dust adhesion. Some bags are made of transparent materials or have visual windows, which facilitate observing changes in the color and state of the catalyst, such as whether it is caked or discolored.

3. Production and Environmental Protection Characteristics

Customized printing is well done. Professional information such as catalyst name, CAS number, danger signs like "corrosive" and "flammable", and storage conditions such as temperature and humidity can be printed on the bag. This can comply with dangerous goods packaging specifications, such as UN certification.

In terms of recyclability and compliance, PE materials can be recycled through physical recycling. Some catalyst packages also need to meet standards such as FDA and ISO to ensure that the materials will not migrate and pollute the catalyst.

The size of catalyst packaging is usually customized according to the usage scenarios, such as laboratories and industrial production, and the form of the catalyst, such as powder, granules, and blocks. The common specifications are as follows:

1. Laboratory/Small Batch Packaging (1-10kg)

The 1kg package has a size of approximately 20cm in width × 30cm in length × 10cm in bottom width, suitable for reagent-grade catalysts and small samples for scientific research.

The 5kg package has a size of about 30cm in width × 45cm in length × 15cm in bottom width, which is commonly used for pilot experiments and small batches of catalysts.

The 10kg package has a size of 35cm in width × 55cm in length × 20cm in bottom width, applicable to small production batches and catalyst carriers.

2. Industrial Bulk Packaging (25-100kg)

The 25kg package generally has a size of 48cm in width × 75cm in length × 25cm in bottom width, and the bottom will be supported by hard cardboard to prevent waist collapse.

3. Packaging for Special Form Catalysts

The size of the packaging for granular catalysts can be reduced by 10%-15% to reduce the shaking space, and the bottom will be added with grid lines to prevent rolling.

For the packaging of liquid catalysts, a PE inner bag can be built into the square-bottom bag, and this inner bag is solvent-resistant. The size will be calculated according to the liquid density, for example, 1L is approximately equal to 1kg, corresponding to the size of the 1kg specification.

In terms of material selection, Catalyst PE Square Bottom Valve Bag should be chosen according to the characteristics of the catalyst. You can choose HDPE, that is, high-density, which is resistant to acids and alkalis; you can also choose LDPE, low-density, which is flexible and impact-resistant; you can also choose modified PE, such as cross-linked PE, which can withstand high temperatures up to 80°C.

In terms of certification requirements, dangerous goods catalysts need to pass transportation certifications such as UN31HA and IMO, and the packaging size must also comply with the stacking standards of dangerous goods containers.

Anti-static testing is essential. The packaging of powder catalysts must pass the surface resistance test, and the resistance value must be ≤10^9Ω to avoid dust explosions caused by static electricity.

If a more accurate size or material scheme is needed, it is recommended to provide the specific type of catalyst, such as hydrogenation catalyst, polymerization catalyst, and the usage scenario.

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