What Types of Valve Bags Can a Valve Bag Making Machine Produce?
When you walk into a warehouse, a cement plant, or even a food packaging facility, you'll often see stacks of neat, block-shaped bags with a small valve opening in the corner. These are called valve bags. They look simple, but they are the result of a carefully designed manufacturing process. Behind them stands a powerful piece of equipment: the valve bag making machine.
What is a Valve Bag?
A valve bag is a type of industrial packaging bag designed with a special valve or spout that allows for easy filling and automatic sealing. Instead of being tied, stitched, or heat-sealed manually, the valve system closes as the bag is filled. This makes the process faster, cleaner, and more efficient.
Valve bags are widely used in industries such as:
● Cement packaging
● Chemicals and fertilizers
● Food products like flour, sugar, and starch
● Building materials such as lime, gypsum, or dry mortar
● Plastics and resins
Their block shape and flat bottom make them stable for stacking, while the valve system prevents spillage and contamination.
How a Valve Bag Making Machine Works?
A valve bag making machine usually consists of two main systems:
✅ Tuber Machine
● Converts rolls of paper or plastic film into continuous tubes.
● Handles cutting, gluing, and folding to form the base tube.
● Can add inner PE film lining for barrier protection.
✅ Bottomer Machine
● Takes the pre-made tubes and forms the bottoms.
● Applies glue, folds corners, and creates the valve opening.
● Ensures precise shapes for block or pinch bottom designs.
Together, the tuber and bottomer machines create a seamless workflow that results in strong, well-shaped bags ready for filling.
Tecon High Speed Bottomer Machine
Types of Valve Bags Produced by a Valve Bag Making Machine
A modern valve bag making machine is flexible and capable of producing multiple variations, depending on the needs of the industry.
1. Paper Valve Bags
Paper valve bags are probably the most common and traditional type. Made from kraft paper, they are eco-friendly and recyclable. They are often used for packaging cement, flour, starch, and animal feed.
● Layers: Machines can produce bags with 1–4 layers, depending on the strength required.
● Printing: High-quality flexographic printing can be applied for branding and product information.
● Options: Machines can produce both unlined and polyethylene (PE)-lined paper valve bags for moisture-sensitive products.
2. PE Valve Bags (Polyethylene Valve Bags)
For industries where moisture protection is critical, PE valve bags are the preferred choice. These bags are water-resistant and tear-resistant, making them suitable for chemicals, resins, or powdered building materials.
● Transparency: Some PE valve bags are semi-transparent, so the product can be partially visible.
● Sealing: The valve can be heat-sealed after filling to ensure complete protection.
● Durability: Stronger than paper bags, making them ideal for heavier materials.
3. Paper-Poly Valve Bags (Hybrid Valve Bags)
A growing trend is the combination of paper and PE film layers. These hybrid bags combine the eco-friendly look of paper with the strength and moisture barrier of plastic.
● Applications: Used in fertilizers, construction materials, and specialty chemicals.
● Aesthetic: They look premium, making them appealing for branded products.
● Performance: Combines stackability, durability, and product protection.
4. Block Bottom Valve Bags
Also known as square-bottom bags, these are the most stable type. Thanks to their brick-like shape, they stack perfectly on pallets without slipping.
● Advantages: Ideal for long-distance transport and export.
● Uses: Cement, gypsum, and food powders are often packed in block-bottom bags.
● Machine Role: A bottomer machine is essential for creating these flat, well-formed bottoms.
5. Pinch Bottom Valve Bags
These are paper bags with a pre-applied hot-melt adhesive. After filling, the top is sealed by folding and heating, creating a tamper-proof closure.
● Best For: Food-grade packaging, seeds, milk powder, or pharmaceutical powders.
● Look: Provides a very neat, premium finish.
● Machine Requirement: Precision cutting and glue application are necessary in the tuber and bottomer processes.
6. Custom-Designed Valve Bags
Many industries require custom valve bag designs:
● Anti-slip surfaces for easier stacking.
● Vent holes for products that release air during filling (like cement).
● Special coating for chemical resistance.
● Handle cut-outs for retail-friendly packaging.
Modern valve bag making machines can be adjusted to produce these specialized features.
Why Choose Tecon Valve Bag Making Machines?
When it comes to valve bag production, not all machines are the same. Tecon is a manufacturer that specializes in this field, offering high-quality equipment designed specifically for valve bag production.
● Over years of industry experience, Tecon machines have been used in cement plants, food packaging factories, and chemical industries worldwide.
● Known for durability, automation, and efficiency, helping companies cut costs and improve packaging quality.
● Provides customized solutions for unique bag requirements.
If you're considering investing in valve bag production, Tecon offers a complete production line solution—from tuber to bottomer.
Conclusion
A valve bag making machine can produce a wide variety of bag types, including paper valve bags, PE valve bags, hybrid paper-poly bags, block bottom bags, and pinch bottom bags. Each type serves a specific purpose in industries like cement, chemicals, fertilizers, and food packaging.
With specialized equipment like Tecon's tuber machines and bottomer machines, manufacturers can ensure top-quality bags that meet the strict demands of modern packaging. Whether you need moisture protection, stackability, or a premium finish, Tecon has the expertise and technology to deliver.
For more details or to explore how Tecon can help with your packaging solutions, we invite you to contact Tecon at info@newtecon.com directly and learn more about valve bag making machines.