Multilayer Valve Bag Making Machines: Tuber and Bottomer Systems
In industries where bulk products such as cement, chemicals, food ingredients, or seeds need efficient, durable, and cost-effective packaging, multilayer valve bags have become the gold standard. The production of these bags requires precision machinery—specifically, Multilayer Valve Bag Making Machines composed of two essential systems: the tuber and the bottomer. These systems operate in tandem to convert paper reels into finished industrial sacks with high strength, moisture resistance, and filling efficiency
This article delves deep into how these machines function, their key components, manufacturing benefits, and application scenarios.
Understanding Valve Bags and Their Industrial Relevance
Valve bags, often made from multiple layers of kraft paper or laminated materials, are used for the automatic filling and packaging of powder or granular materials. Their structure allows for quick filling through a small valve opening and self-sealing once full, reducing dust leakage and improving handling.
Multilayer valve bags are critical in industries such as:
● Cement packaging
● Chemical powder transportation
● Agricultural seed storage
● Flour and food-grade powder distribution
The increasing demand for high-performance industrial sacks is driving innovation in valve bag converting machinery, particularly systems that integrate tuber machines and bottomer machines.
The Tuber System: Precision in Tube Formation
The tuber machine is the front-end system in a valve bag production line. Its main function is to transform rolls of kraft paper into a continuous tube, which will later be cut and processed into individual bags.
Key Functions of the Tuber:
● Paper unwinding: Multiple reels of paper are unwound simultaneously to create the multilayer structure.
● Edge gluing and folding: The side edges of the paper sheets are glued and folded precisely to form a durable tube.
● Longitudinal pasting: Adhesives are applied between layers and at side seams.
● Printing integration: Tuber machines can include flexographic or inline printing units for brand logos or product info.
● Tube cutting: The continuous paper tube is cut into exact lengths, known as bag blanks, based on the desired final bag size.
Modern tubers are equipped with servo-driven systems, automated tension controls, and high-speed cutting tools, ensuring consistent output even at production rates of over 120 tubes per minute.
Step Cut/Straight Cut Servo Tuber Machine
The Bottomer System: Finishing with Strength and Functionality
Once the paper tubes are created, they are transferred to the bottomer machine. This system applies the finishing touches to produce a functional bag, complete with a sealed bottom and valve opening.
Core Operations of the Bottomer:
● Bottom pre-folding: The ends of the tube are creased to facilitate folding.
● Valve sleeve insertion: A small piece of paper or film is inserted at one end to create a filling valve.
● Bottom pasting: Adhesives are applied to fold and seal the bag bottom, forming a strong, leak-proof closure.
● Bottom folding and pressing: Folding arms and hydraulic presses ensure secure and uniform bonding.
● Stacking and delivery: Finished valve bags are automatically stacked for packaging.
Modern bottomer machines also offer customization features, allowing production of stepped-end bags, flush-cut bags, or internal valve bags depending on the end-user’s filling system.
Advanced Servo Bottomer Machine Suitable for Valve Bags Making
Integration and Automation in Modern Systems
Today’s valve bag making machines are highly automated, allowing seamless synchronization between tuber and bottomer systems. This integration is key for:
● Reducing manual handling and associated labor costs
● Ensuring perfect alignment of printed designs
● Maximizing throughput without compromising quality
● Achieving shorter changeover times for different bag sizes or materials
With the rise of Industry 4.0 and IoT-enabled manufacturing, some high-end bag converting lines include SCADA systems, predictive maintenance modules, and real-time production analytics.
Materials and Sustainability in Valve Bag Production
Most valve bag converting machines are designed to work with:
● Virgin kraft paper
● Recycled paper layers
● PE-coated paper
● BOPP films for lamination
As sustainability becomes a central concern, valve bag machine manufacturers are optimizing machines for eco-friendly valve bag production, including recyclable paper composites and solvent-free adhesives. Moreover, modular valve bag machine designs make it easier to upgrade systems to accommodate biodegradable or compostable layers, further future-proofing production lines.
Application Scenarios: From Cement to Coffee
The versatility of multilayer valve bags makes them the preferred choice across a wide range of industries:
● Construction: Cement, mortar, gypsum, and plaster packaging
● Agriculture: Seed, animal feed, and fertilizer bags
● Food processing: Flour, sugar, spices, and starch bags
● Chemicals: Pigments, resins, and mineral powders
● Petroleum products: Activated carbon, drilling mud, and additives
These application scenarios dictate the required bag specifications—such as moisture barrier performance, weight capacity (commonly 25–50 kg), and print quality.
Choosing the Right Valve Bag Making Machine
When evaluating machinery for valve bag production, consider the following:
● Production capacity (bags per hour)
● Material compatibility (number and type of paper layers)
● Bag size flexibility
● Automation level
● Machine footprint and integration capabilities
● After-sales support and parts availability
Maintenance and Operational Efficiency
To ensure long-term efficiency, modern valve sack production lines include:
● Quick-change modules for rollers, glue units, and folding plates
● Tool-free adjustments for size changes
● Remote diagnostics for predictive maintenance
● Self-cleaning systems for glue applicators and print heads
Operators should be trained to understand the synchronization between tuber and bottomer units and to perform regular inspections of key mechanical parts such as conveyor belts, gluing units, and folding arms.
Market Outlook and Future Innovations
The global market for industrial valve bags is expected to grow due to increasing demand for durable and eco-conscious packaging. As a result, the market for automated valve bag making machinery is also expanding, with innovations focusing on:
● Smart bag traceability
● AI-powered defect detection
● Digital print integration for shorter batch runs
Leading Supplier Spotlight: Tecon Valve Bag Production Lines
For manufacturers seeking a trusted, high-performance solution in valve bag production, Tecon stands out as a leading supplier of fully automated valve bag making machines. With decades of experience in the field of multilayer paper sack machinery, Tecon offers integrated systems that combine precision, efficiency, and adaptability.
If you're looking for a reliable partner to establish or expand a valve bag converting line, Tecon delivers both robust equipment and engineering expertise tailored to your specific application needs.
Multilayer Valve Bag Making Production Line
Conclusion
Multilayer valve bag making machines, powered by the synchronized action of tuber and bottomer systems, are at the heart of high-performance industrial packaging. These machines enable manufacturers to produce strong, customizable, and sustainable valve bags for a diverse set of applications—from cement to chemicals, food to seeds.
With a proven track record and global reach, Tecon’s tuber and bottomer lines offer the speed, reliability, and flexibility modern packaging plants demand—whether you're producing cement valve bags, chemical sacks, or food-grade paper packaging.
By choosing the right valve bag production line—from trusted manufacturers like Tecon—you ensure not only high product quality but also long-term efficiency, scalability, and a competitive edge in your industry. Contact Tecon for more details or to request a custom modern valve bag manufacturing solution.