Process flow of paper-plastic composite bags

1. Raw material preparation:

- Paper: usually kraft paper, coated paper, etc.

- Plastic: such as polyethylene (PE), polypropylene (PP), etc.

2. Paper processing:

- Paper needs to be pre-processed by cutting, cleaning, etc. to ensure that the surface is flat and free of impurities.

3. Printing:

- Printing on paper can be single-color or multi-color printing, and the printed content can be text, patterns, etc.

4. Coating:

- Apply adhesive on one side of the paper to facilitate bonding with the plastic layer.

5. Composite:

- The paper coated with adhesive is composited with plastic film by hot pressing or cold pressing.

6. Drying:

- The composite paper-plastic material needs to be dried to ensure that the adhesive is completely cured.

7. Slitting:

- The large roll of composite material is slit according to the required size.

8. Bag making:

- The slit materials are made into bags, which can be flat bags, self-sealing bags, zipper bags, etc.

9. Quality Inspection:

- Check the quality of finished bags, including size, printing quality, bonding strength, etc.

10. Packaging:

- Pack qualified paper-plastic composite bags and prepare them for shipment.

11. Storage and Transportation:

- Store the packaged paper-plastic composite bags in a dry and ventilated environment and transport them.

This process may vary depending on the specific product requirements and production equipment. Paper-plastic composite bags are widely used in packaging in food, chemical, building materials, and other industries.

FIBC (Flexible Intermediate Bulk Container) bulk bags are an essential tool for transporting and storing bulk materials in industries like construction, agriculture, and chemicals. They are versatile, cost-effective, and can handle a wide variety of products, from cement and sand to chemicals and food ingredients. However, understanding the factors that influence their price and the technology behind specific types of bags, like the white gravel tonne bag, is essential for making informed decisions in industrial applications.

The price of FIBC bulk bags can vary widely depending on several factors, including the material used, the bag’s design, capacity, and the level of customization required. On average, the price of a standard FIBC bulk bag ranges from $3 to $10 per unit, but prices can increase or decrease based on the following factors:

1. Material Choice: The common material for FIBC bags is woven polypropylene (PP), a durable and lightweight plastic that is resistant to moisture, tearing, and UV degradation. Basic bags made from standard polypropylene tend to be on the lower end of the price spectrum. However, more advanced bags made with special coatings or additional features, such as UV-resistant or food-grade coatings, will typically cost more.

2. Bag Size and Capacity: FIBC bags come in various sizes, typically ranging from 500 kg to 2000 kg of capacity. The larger the bag, the higher the cost, due to the increased material and production complexity. For example, a small bag with a capacity of 500 kg will generally cost less than a larger 2000 kg bag, which requires more material, additional reinforcements, and a more robust design.

White gravel tonne bags, typically used in construction and landscaping for the storage and transport of gravel, sand, and other aggregates, have a unique structural design to accommodate the specific demands of such materials. The structural technology behind these tonne bags is tailored to provide strength, durability, and efficient handling, ensuring that the bags can safely carry heavy loads without risk of failure.

1. Material Selection: The primary material used in the construction of white gravel tonne bags is woven polypropylene (PP), known for its strength, flexibility, and resistance to environmental conditions. Polypropylene is chosen for its ability to withstand the weight of heavy aggregates like gravel, as well as its resistance to water, mildew, and UV rays. While the material itself is strong, the structural integrity of the bag is enhanced through its specific weave and stitching patterns.

2. Reinforced Webbing and Stitching: The design of a white gravel tonne bag often includes reinforced webbing around the top, base, and corners. This webbing acts as the primary load-bearing support and is crucial for evenly distributing the weight of the gravel. Without this reinforcement, the bag could risk tearing or deforming under heavy loads. The corners, which are subject to the stress during lifting, are usually double-stitched for additional durability.

3. Load Capacity and Shape: White gravel tonne bags are typically designed to carry one tonne (1000 kg) of material, but their design allows for some flexibility. The bags are built with a square or rectangular shape that helps them maintain stability during lifting and transport. This shape also ensures that the contents remain evenly distributed, preventing any excessive strain on specific areas of the bag. A well-designed tonne bag has a balanced load distribution, the risk of structural failure during handling.