Auto-Fill Square Bottom Valve Woven Bag | For Gypsum & Wall Putty Powder | Basic Custom Text Printing | Factory Direct

Product Overview:
This product is a square-bottom valve bag, specifically designed for automated filling of powdered building materials such as gypsum powder and putty powder. The square-bottom valve structure is compatible with high-speed valve bag filling machines, enabling automatic filling and automatic sealing, resulting in high filling efficiency and minimal dust leakage. Standard printing supports customizable text to meet basic identification needs while effectively controlling packaging costs. Supplied directly by the manufacturer, it offers significant price advantages, with stable and reliable quality.

Applicable Materials:
Gypsum powder (construction gypsum, high-strength gypsum, model gypsum), putty powder (interior putty, exterior putty), cement, dry-mix mortar, leak-stop compound, self-leveling mortar, grout, tile adhesive, and other powdered building materials.

Core Advantages:
Square-bottom valve design for automated filling, high filling efficiency with low dust emission, standard printing with customizable text, direct manufacturer supply offering price advantages, suitable for gypsum/putty powder, self-sealing valve requiring no additional closure.

Square-Bottom Valve for Automated Filling:
This product features a square-bottom valve bag design, specially developed for automated filling production lines. The valve is a pre-formed sleeve structure that fits tightly with the filling nozzle during operation. After filling, the nozzle retracts, and the valve closes automatically under the pressure of the bag's contents, requiring no manual sewing or heat sealing. During the valve filling process, material flows through a closed channel, minimizing dust leakage, improving the working environment in the filling area, and reducing material loss.

Customization Scope:
Dimensions (length, width, and bottom width) can be customized according to filling weight. Valve specifications (length and diameter) can be tailored to the filling nozzle. Printing supports single-color standard printing, with custom text content, font, and layout. Thickness (woven fabric weight) can be adjusted as needed. Optional PE lamination or PE inner liner can be added for moisture protection.

Suitable for Gypsum/Putty Powder Packaging:
This product is optimized for the characteristics of powdered building materials such as gypsum powder and putty powder. It is made of PP woven fabric with high weaving density and adequate weight, offering excellent tensile strength and puncture resistance, effectively resisting abrasion and puncturing by powder particles during filling and handling.

Moisture Resistance:
This product is designed without lamination or inner liner, providing general moisture resistance. Gypsum powder and putty powder are sensitive to moisture; if exposed, they may cake, harden, and lose effectiveness. For long-term storage or use in high-humidity environments, it is recommended to opt for PE lamination or a PE inner liner.

Valve Specifications:
Valve length is generally 80–120mm, and valve diameter is customized according to the filling nozzle size. Valve position options include center valve or offset valve. The valve is integrally formed with the bag body, with no risk of delamination or detachment. After filling, the valve closes automatically with no additional operations required.

Material & Process:
The outer layer is made of PP woven fabric, with fabric weight customized according to load requirements. The bag type is a square-bottom valve bag, with a square, three-dimensional bottom. The valve is of a sleeve type, integrally formed. Printing uses standard gravure printing, single-color, supporting custom text content.

Packaging Drop Test:
Under a 40kg load, after a 1.2m free fall test, the bag shows no rupture or leakage after six-sided drops.

Advantages of Direct Manufacturer Supply:
Produced directly at the source factory with no intermediate links, offering significant price advantages. Uniform raw material procurement and standardized production processes ensure stable and controllable quality. Independent production capacity allows flexible scheduling and coordination of urgent orders. Quality issues are handled unconditionally, with reliable after-sales support. Standard MOQ is 5,000 bags, with negotiable lower quantities for new customers.

Packaging Specifications:
Filling weight can be customized to 20kg, 25kg, 40kg, etc.

Environmental Compliance:
The product is made from virgin PP materials, recyclable. Export certification is supported.

Target Customers:
This product is suitable for gypsum powder manufacturers, putty powder producers, cement plants, dry-mix mortar companies, leak-stop compound and self-leveling material manufacturers, building material packaging purchasers, and powdered building material export traders.

Price & MOQ:
Specific pricing and minimum order quantity (MOQ) are negotiable.