What is the Inner Liner of a FIBC Bulk Bag?

The Inner Liner of a FIBC Bulk Bag (also called Jumbo Bag or Big Bag), serves as an essential component for protecting the dry flowable contents of the bag, ensuring their quality, safety, and integrity during transportation and storage. By selecting the right material and customization options, the Inner Liner can be tailored to meet the specific needs of the product being stored.

1. The most widely acceptable definition

An Inner Liner is a secondary layer or bag mounted inside the primary structure of the FIBC Bulk Bag. It is typically made from materials such as polypropylene (PP), aluminum foil, or other specialized materials depending on the requirements for moisture, oxygen, and contamination control.

2. The main functions

- Moisture and Oxygen Barrier: The Inner Liner provides a barrier to protect the dry flowable contents from moisture and oxygen, which probably undermine to the quality and shelf life of many products.

- Contamination Control: By creating a clean, isolated environment, the Inner Liner helps prevent contamination from foreign matter intrusion, such as dirt, dust, and other impurities.

- Leakage Prevention: The Inner Liner ensures that the dry flowable contents do not leak out, maintaining the integrity and safety of the product during transportation and storage.

- Product Preservation: For sensitive products, such as food, pharmaceuticals, and chemicals, the Inner Liner can be tailored and customized to provide the specific protection needed to maintain product quality and safety.

3. Materials of Inner Liners

Inner Liners can be made from various materials, depending on the specific requirements of the product being stored. Some commonly used materials include:

3.1 Polypropylene (PP): 

A versatile and cost-effective material that provides good moisture and oxygen barrier properties. Recommended products with this type Inner Liners:

- Food Products: Grains, sugars, flours, starches, nuts, spices, and other dried food items.

- Agricultural Products: Fertilizers, pesticides, and other agricultural chemicals.

- Minerals and Ores: Non-hazardous minerals and ores that do not require specialized chemical resistance.

3.2 Aluminum Foil: 

Most offen used along with FIBC Bulk Bag Tapes, offers superior protection against moisture, oxygen, and light, making it ideal for sensitive products.

- New Energy Battery Materials: Lithium-ion battery positive and negative electrode materials, Lithium iron phosphate battery materials.

- Food Products: Dairy products, fats and oils, condiments, and other food items that require protection from light, oxygen, and moisture.

- Pharmaceuticals: Active pharmaceutical ingredients (APIs), excipients, and other pharmaceutical raw materials that need to maintain their potency and purity.

- Patrol Chemicals: Certain chemicals that are sensitive to light, oxygen, or moisture and require high-barrier packaging.

3.3 Specialized Materials: 

For highly specialized applications, such as those requiring chemical resistance or temperature stability, specialized materials may be used.

4. Tailored Designs on Customization

Inner Liners can be customized to fit the specific needs of the product and the bag. 

- Size and Shape: The Inner Liner can be tailored to fit the dimensions of the FIBC Bulk Bag perfectly.

- Material Selection: The choice of material can be tailored to provide the required level of protection for the product.

- Printing and Labeling: Custom printing and labeling options can be added to the Inner Liner for identification and traceability purposes.

Bojin BR6721 is specially designed for constructing FIBC Bags, Bulk Bags, Big Bags, Ton Bags. Excellent adhesion and strength, long-lasting holding power, resists abrasion, scuff and tearing, seamlessly bonding the Inner Liners(e.g. aluminum liner) and the Outer Bags. Keep the liner layer integrity and better prevent moisture and oxygen.