China Valve Bag Manufacturers Suppliers - Customized Valve Bag Wholesale

Your Professional Valve Bag Supplier

Haosence Packaging is a professional manufacturer of FIBC big bags with 19 years of industry experience. We focus on producing reliable, multi-functional packaging solutions that help customers improve efficiency and control costs. Our product range includes FIBC big bags, jumbo bags, bulk bags, PP sling bags, valve bags, and other woven packaging products.

Proven Manufacturing Capacity

Over 200 skilled workers and 10 production lines ensure stable output and on-time delivery, even for large-volume orders.

Strict Quality Control

Each bag is inspected individually by a dedicated QC team to meet international standards and buyer expectations.

Global Market Experience

Long-term exports to the USA, Canada, Australia, and Southeast Asia help us support buyers with market-ready solutions and smooth cooperation.

Cement Valve Bag
Cement valve bags are designed for efficient, high-speed filling. Materials can be loaded directly through a hose, and once filled, the valve seals automatically to prevent spillage. Made with high-quality virgin materials, masterbatch,
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Concrete Valve Bag
Concrete valve bags are made from premium polypropylene with UV protection and sealed using heat-weld technology for reliable closure. Their design allows fast filling through the top valve, which automatically seals after filling, making
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Wall Putty Valve Bag
Wall putty valve bags, also known as pasted bottom bags, are designed with a valve opening positioned at the top corner or the bottom of the bag. This feature enables fast and efficient filling, as the filling nozzle is inserted directly
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Fertilizer Valve Bag
Fertilizer valve bags are fully sealed packaging bags with a built-in filling valve. The valve features an internal hook-style fold that automatically closes once the bag is filled, preventing any leakage.Unlike regular open-top bags that
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BOPP Valve Bag
BOPP valve bags are specially designed for reliable, high-speed filling of powders and granules. Made from premium BOPP film, they provide excellent strength, tear resistance, and protection against moisture. These bags can be fully
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Specification

Raw Material	100% Virgin new PP
Layer	Single layer
Dimension	As customer's requirements
SWL	15kg-50kg
Fabric	Coated /uncoated /leakproof
Colour	White, Green,Beige and customization
Printing	According to the client's request, Max 10 colors
Features & Benefits	UV stabilization/Antioxidant
Quality Assurance & Standards	ISO 21898

Advantages of Valve Bag

Secure Seal Mechanism

Polythene valve sacks feature a unique automated valve closure mechanism that provides a secure seal for the product that is initiated by the internal pressure of the product within the sack. This design safeguards your contents from moisture ingress, dust, and contamination throughout the supply chain process, so that they arrive with your customer in perfect condition.

Moisture Resistance

One of the benefits of using valve sacks for dry goods – especially polythene valve sacks – is their superb moisture resistance. This is essential for hydro-sensitive products, such as cement, that are transported in open top lorries or stored outside while awaiting use.

Dust And Contamination Protection

Valve sacks also provide a barrier against dust and biological contaminants, which is critical for industries where product purity is essential, such as agriculture, chemical processing, food processing, and pharmaceuticals.

Streamlined Sealing Process

Conventional packaging methods usually require additional sealing equipment to secure the contents of the bag, which can be labour-intensive and costly. Valve sacks streamline and simplify the packaging process, saving time, space, and money in the pack house.

Safe And Efficient Handling

Bulk valve sacks are designed with ease of handling in mind, and are typically lighter and more flexible than other FIBC bags. This makes them easier and safer to manoeuvre manually, or by machine, during the filling, handling, and transportation chain.

Sustainability And Waste

Many modern valve sacks are manufactured from sustainable materials, with recycled paper valve sacks now available with similar strength and performance characteristics to their polythene equivalents. The efficient design of valve sacks also minimises waste material during the packaging process.

Applications of Valve Bag

Construction Industry: For filling building materials such as cement, sand, etc.

Food Industry: Solid foodstuffs such as sugar, flour, cocoa powder, salt, etc.

Mineral Industry: E.g. garnet, graphite, bentonite, etc.

Agricultural Industry: E.g. seeds, animal feed, fertilisers, etc.

Chemical Industry: Powder and granular materials such as plastic granulate, zinc oxide, etc.

Different Materials Used for Valve Bags

Polyethylene (PE)
Polyethylene is a common material used in valve bag-making machines due to its durability and flexibility. PE valve bags are known for their excellent moisture resistance, making them ideal for packaging products that need protection from humidity.

Polypropylene (PP)
Polypropylene is another popular material for valve bags. PP valve bags are lightweight, strong, and resistant to chemicals, making them suitable for a variety of applications.

Woven Fabrics
Woven fabrics, often made from PP or PE, provide additional strength and durability. These materials are used for heavy-duty applications where the packaging needs to withstand rough handling and transportation.

Paper
Paper valve bags are eco-friendly and provide excellent printability, making them a preferred choice for branding and marketing purposes. They are often used in industries where the packaging needs to be both functional and visually appealing.

Paper-Plastic Composites
These materials combine the benefits of both paper and plastic, offering durability, moisture resistance, and excellent printability. Paper-plastic composite valve bags are versatile and can be used in various industries.

Production Process of Valve Bags

Tape extrusion and orientation: PP sheet is slit into tapes and drawn for strength and low creep.

Weaving: Tapes become fabric on circular/flat looms, GSM and pick density are tuned to fill weight and drop targets.

Coating/lamination (optional): Raises moisture resistance and print fidelity, anti‑slip varnish may be targeted to back panels.

Conversion into block‑bottom valve sacks on dedicated lines, valves are formed and attached with tight dimensional tolerances for the customer’s packers.

Printing (reverse on film or surface on coated fabric), coding, and finishing.

Packaging and Shipping

Packaging	Carton and wooden case, also be packged according to customer requirements.
Shipping	Shipping by sea, by air, by express are acceptable. According to your requirements.

Our Factory

As a direct manufacturer of FIBC bags, we operate with 200+ workers and maintain 10 production lines each month.

Our Certificates

FAQ

Q: What is a valve bag?

A: A valve bag is a packaging bag with a small valve opening for fast filling. The valve closes automatically after filling. A valve bag is widely used for powder and fine materials.

Q: How does a valve bag work?

A: A valve bag is filled through a valve using air or gravity. When filling stops, the valve closes by itself. This design reduces dust and product loss.

Q: What sizes are available for a valve bag?

A: Valve bag sizes usually range from 10 kg to 50 kg. Custom sizes are also available to meet different packing needs.

Q: Does a valve bag need sewing after filling?

A: No, a valve bag does not need sewing. The valve closes automatically, saving time and labor.

Q: Can a valve bag be moisture resistant?

A: Yes, a valve bag can be laminated or include a PE liner. This helps protect products from moisture and contamination.

Q: Can a valve bag be printed with logos?

A: Yes, a valve bag can be printed with logos, product names, and instructions. Printing improves brand visibility.

We're well-known as one of the most reliable valve bag manufacturers and suppliers in China, featured by quality products and good price. Please feel free to wholesale customized valve bag made in China here from our factory. Browse our website now.

BOPP Valve Bag, Cement Valve Bag, valve bag