Introducing Our High-Quality Valve Bags – The Ultimate Packaging Solution for Powders, Granules, and Construction Materials

Our valve bags, also known as pasted valve sacks or block bottom bags, are specifically designed for high-speed automated filling lines. Unlike open-mouth bags, the valve bag features a corner valve that allows for efficient, dust-free filling. Once filled, the material inside presses against the valve, creating a self-closing and sift-proof seal.
Widely used for cement, dry mortar, chemical powders, and food additives, our valve bags are a reliable, high-strength packaging solution.

Why Choose Our Valve Bags?

1.  Superior Strength & Durability:

    Crafted from high-quality [Kraft Paper / PP Woven / Combination Material], our bags offer exceptional tensile and bursting strength. The multi-ply construction ensures safe transportation and storage, even under high stacking pressure.

2.  Excellent Barrier Properties (Optional):

    Laminated:We offer options with PE coating or lamination to provide moisture-proof and waterproof protection, keeping your sensitive products (like chemicals or food ingredients) dry.

    With Inner Liner: For ultra-fine powders (like titanium dioxide, carbon black), we recommend a PE inner liner to prevent any leakage and ensure 100% product recovery.

3.  Dust-Proof & Efficient Filling:

    The precision-cut valve (available with or without a non-return valve insert) minimizes spillage and dust during the filling process, creating a cleaner working environment and saving product loss.

4.  Customization Options:

    Size & Ply:Fully customizable to match your specific filling machine and weight requirements.

    Printing:High-definition flexographic printing up to 6 colors. We can print your logo, product information, and barcodes with vibrant, fade-resistant ink.

    Valve Types:Available in cuffed valve, folded valve, or with a non-return flap to prevent sifting.

5. Eco-Friendly Option:

    Our paper valve bags are made from renewable resources and are recyclable, supporting your brand's sustainability goals.

Common Applications:

Construction:Cement, Gypsum, Plaster, Sand, Dry Mortar, Putty Powder.

Chemicals:Calcium Carbonate, Titanium Dioxide, Carbon Black, Plastic Granules, Resin.

Agriculture & Food:Animal Feed, Grain, Flour, Sugar, Starch, Milk Powder, Food Additives.

Minerals:Silica Sand, Quartz, Bentonite.

Quality Control:

We implement strict quality control at every stage of production. Each batch is tested for:

- Seam Strength: Ensuring the bottom patch is securely attached.

- Tensile Strength: Withstanding the force during filling and handling.

- Air Leakage Test: Guaranteeing a dust-proof seal.

Why Choose Us?

Factory Direct:We are a professional manufacturer with +20 years of experience in flexible packaging.

Free Samples:We provide free samples for quality testing (customer pays shipping cost).

OEM/ODM Service:Your design, your size, your brand.

Quick Response:24/7 online service. Any questions will be replied within 1 hour.

Product Name
Option1: High Strength Kraft Paper Valve Bag Laminated Waterproof 3 Ply Cement Packaging Sacks

Option 2: Custom Printed 2 Ply to 6 Ply PP Woven Valve Bags Heat-Sealed & Leak-Proof for Chemical Powder

Option 3 :  Food Grade PE Inner Liner Valve Bag Dust-Proof Packaging for Milk Powder / Flour / Additives

Option 4:  Top Quality 50kg Multi-Wall Paper Valve Bags for Cement / Sand / Granules

key words
*   Valve bag, Valve sacks, Pasted valve bag, Block bottom bag.

*   Kraft paper valve bag, PP woven valve bag, Cement valve bag, Chemical powder bag, 25kg valve sack, Multi-wall paper bag.

*   Dust-proof valve bags for carbon black, Moisture proof laminated valve bags, Self-closing valve bags for automatic filler, 50kg industrial packaging bags.

 Specification

Product Name    Kraft/PP/Woven Valve Bag /Valve Sack / Pasted Valve Bag

Material  3 Ply Kraft Paper / Kraft Paper + PP Woven / Kraft Paper + PE Film

Ply/Plies  2 / 3 / 4 / Customized

Valve Width  Standard 6-8 cm / Customized

Size    Width: cm x Length: cm x Gusset:cm

Loading  Weight   5kg / 10kg / 25kg / 50kg

Printing  Up to 6 Colors Flexo Printing / Gravure Printing

Lining   With PE Liner / Without Liner

Certification   ISO 9001 / SGS / RoHS / Food Grade Contact Certificate

FAQ

Q1: What is the difference between a valve bag and an open mouth bag?

A: A valve bag has a small opening (valve) in one corner for filling. After filling, the product pressure closes the valve. It is faster and cleaner for automated machines. Open mouth bags require sewing or sealing after filling.

Q2: Can you make the valve with a non-return feature?

A: Yes, we can add a non-return sleeve or insert inside the valve to prevent the fine powder from sifting out after filling.

Q3: What is the standard valve size?
A: The standard valve size is usually around 6-8 cm in width and 10-12 cm in depth, but we can customize it to match your filling spout perfectly.