In the bulk packaging industry, FIBC (Flexible Intermediate Bulk Containers), also known as ton bags, bulk bags or jumbo bags, play an irreplaceable role in the storage and transportation of dry bulk materials such as chemicals, building materials, granules and minerals. With the increasing demand for packaging durability, moisture resistance and dustproof performance in various industries, the lamination process of FIBC has become a core technology affecting product quality and application scope. This article will deeply interpret the mainstream lamination processes of FIBC, their advantages and application scenarios, and introduce how our company uses mature lamination technology to provide customized solutions for global customers.
Mainstream Lamination Processes of FIBC: Extrusion Lamination and Dry Lamination
FIBC lamination refers to compounding a layer of PE or PP film on the surface of PP woven base fabric to form a dense protective layer, which can effectively make up for the defects of woven fabric such as poor sealing and easy dust leakage. At present, there are two mainstream processes in the industry: extrusion lamination (cast coating) and dry lamination (pre-coated film), among which extrusion lamination is the most widely used due to its cost advantage and stable performance.
1. Extrusion Lamination (Cast Coating): Cost-Effective and High-Efficiency Core Process
As the most popular lamination process in the FIBC industry, extrusion lamination adopts a one-step forming method, which has the characteristics of high production efficiency, strong bonding fastness and low cost, and is suitable for mass production of conventional laminated FIBC. Its specific process flow is as follows: first, the PP woven base fabric is subjected to corona treatment to improve surface tension and enhance the bonding effect with the film; then, PP/PE particles mixed with UV anti-aging masterbatch or antistatic masterbatch are melted at 250-280℃ by an extruder and extruded into a thin melt film through a T-die; next, the melt film is hot-pressed with the pretreated base fabric at 220-240℃, and pressed by a composite roller at 80-100℃ to realize seamless bonding without bubbles or white exposure; finally, it is cooled and shaped by a cold water roller, aged at constant temperature for 24-48 hours to release internal stress, and then cut and sewn into finished products.
The key parameters of this process directly determine the product quality: the thickness of the laminated film is usually 8-15μm, and double-sided lamination has the best waterproof effect, with a moisture permeability of less than 5g/㎡·24h; the control of temperature and pressure is the core-too low temperature will lead to film peeling, and too high temperature will make the base fabric brittle; adding UV anti-aging formula can make the FIBC resist outdoor exposure for 1-3 years, greatly extending its service life.
2. Dry Lamination (Pre-Coated Film): High-End Customized Optional Process
Dry lamination is mainly used in high-demand scenarios such as high barrier, high bonding fastness and aluminum foil composite. Its process principle is to coat polyurethane adhesive on the pre-coated film (PE/PP/PET), then hot-press it with the PP woven base fabric, and cure it for 24-48 hours to complete the compounding. Compared with extrusion lamination, dry lamination has the advantages of uniform film thickness and high flatness, but its cost is higher, and there is a risk of adhesive residue, so it is mostly used for high-end customized FIBC in food, pharmaceutical and other industries.
Types of FIBC Lamination and Industry Application Directions
According to the different positions of lamination, FIBC can be divided into three types: single-sided outer lamination, single-sided inner lamination and double-sided lamination, which are suitable for different industry scenarios to meet diverse packaging needs:
◆Single-sided outer lamination: The outer layer is waterproof and dustproof, and the inner layer has high friction to prevent slipping, which is suitable for packaging ordinary powders, building materials and other products;
◆Single-sided inner lamination: The inner layer is smooth, anti-sticking and easy to unload, with low residue, which is suitable for fine powders in food and chemical industries;
◆Double-sided lamination: Full sealing, excellent moisture-proof and anti-seepage performance, strong weather resistance, which is suitable for outdoor storage, marine transportation and high-humidity environment, and can effectively protect materials from moisture and pollution.
Our Company: Professional Laminated FIBC Manufacturer with Advanced Technology and Customized Capabilities
As a professional manufacturer and exporter focusing on FIBC R&D, production and sales, we have rich experience in the lamination process of FIBC, and have built an integrated production system covering raw material selection, process control, quality inspection and after-sales service, serving more than 60 countries and regions around the world.
In terms of lamination technology, we adopt advanced extrusion lamination equipment and strict process control standards: we select high-quality PP/PE raw materials, add professional UV anti-aging, antistatic and flame-retardant formulas according to customer needs, and the peeling strength of laminated FIBC reaches more than 3N/5cm, which is far higher than the industry standard; our dust-free workshop and professional dust removal equipment ensure the cleanliness of the production process, and the qualified product rate reaches 99.86%. We can provide customized services such as single-sided/double-sided lamination, film thickness adjustment, and functional formula addition, and tailor suitable laminated FIBC solutions for customers in building materials, logistics, chemical industry, granule industry and other fields.
In addition, we have passed ISO 9001 and CE certifications, with stable production capacity of 100,000 pieces per month and the shortest delivery cycle in the industry. Our professional technical team and 24-hour pre-sales and after-sales service team can timely solve customer consultation and after-sales problems, and track the production progress and transportation status of orders in real time, making customers' purchase experience more worry-free. For more product details and customized quotes, please contact us via email: dzsybags@dzmaterial.com or visit our official website:https://www.dzmaterial.com/
Conclusion
The lamination process is the key to improving the performance of FIBC and expanding its application scope. With the continuous upgrading of industrial packaging demand, high-quality laminated FIBC will become the mainstream choice in the bulk packaging market. Our company is committed to integrating advanced lamination technology into every link of production, adhering to the concept of "high quality, customization and high cost performance", and providing reliable bulk packaging solutions for global customers. Whether you need ordinary laminated FIBC or high-end customized products, we can meet your needs with professional strength and sincere service.
