Square-valve woven bags, 40x55 cm, for cement packaging; stackable, stable, non-slip, and wear-resistant.

Applicable materials: 
Whitewash (tree whitewash), lime powder, calcium powder, putty powder, plaster powder, cement, dry-powder coatings, waterproofing powder, and other dry-powder construction materials.

Core Advantages: 
Stable, non-tilting palletizing; anti-slip bottom pattern design; wear-resistant and puncture-proof; high dust resistance (for valve-mouth filling); high filling efficiency (6–15 seconds per bag); compatible with high-speed filling lines; no manual sealing required.

Material and Craftsmanship: 
The base material is woven PP (polypropylene) or HDPE (high-density polyethylene) fabric, with an optional PE barrier film on the inner layer (either laminated or co-extruded as an inner liner). The bag style is a square valve bag with a flat bottom; the valve can be either cuff-style or flap-style. Printing is carried out using 2- to 7-color rotogravure, resulting in clear, durable, and abrasion-resistant graphics.

Anti-slip design: 
The bag bottom and body can be optionally equipped with anti-slip embossing or an anti-slip coating, effectively increasing the coefficient of friction and preventing slippage during stacking.

Wear resistance: 
The woven fabric is manufactured using a high-density weaving process, resulting in a smooth, tightly packed surface that is resistant to abrasion and puncture, making it suitable for long-distance transportation and repeated handling.

Valve port structure: 
Pre-formed valve ports automatically seal after filling, eliminating the need for additional sealing operations and reducing dust spillage by more than 90%.

Applicable filling method: 
Compatible with dedicated valve-fillers (impeller-type, screw-type, and pneumatic), ideal for high-speed rotary filling systems.

Tensile strength: 
≥700 N/50 mm (30% above the national standard), capable of withstanding stacking and transportation under a load of 40 to 50 kg.

Moisture resistance (optional): 
Laminated products exhibit a water vapor transmission rate reduction of more than 90%, effectively preventing feed and fertilizers from becoming damp, caked, or deteriorating.

Stacking stability: 
The square valve opening design ensures that the bag maintains a full, square shape after filling, enabling neat and stable palletizing without tilting. The 40×55 cm size is compatible with standard pallets, optimizing warehouse space utilization.

Packaging drop test: 
With a 50 kg load, a 1.2-meter free fall, and six-sided drop tests, the product remains intact and leak-free.

Printing standards: 
Solvent-resistant ink, compliant with cement and coating packaging labeling standards. 100% barcode/QR code scan rate.

Customization Scope: 
Multi-color overprinting of brand logos, product names, and usage instructions. Optional inclusion of warning labels (“Moisture-Proof,” “Sun Protection”), barcodes, QR codes, metrology markings, anti-slip embossing, and environmental recycling symbols.

Environmental Compliance: 
Made from virgin materials and recyclable. Supports hazardous packaging export certification.

Key features: 
Palletizing Stability: Square valve design ensures a square bag shape after filling, preventing tilting during stacking.

Non-slip and wear-resistant: Optional non-slip sole pattern; high-density woven fabric for superior friction resistance and puncture protection.

High dust containment: valve-mouth filling reduces dust spillage by more than 90%.

High efficiency: filling speed of 6–15 seconds per bag, compatible with high-speed production lines.

Seal-free: the valve opening self-seals, eliminating the need for manual sewing or heat sealing.

Packaging specifications: 
40×55 cm (length × width), loading capacity 40–50 kg, valve opening size 80–120 mm, with optional inner bag and laminated film. 
Special Note: 
The 40×55 cm square valve bag is specifically designed for packaging 40–50 kg of material and is compatible with standard pallets (100×120 cm). Each layer can hold 5–6 bags, with a stacking height of 8–10 layers. Its anti-slip design effectively reduces the risk of bag slippage during transportation and storage, making it ideal for long-distance shipping and high-stack storage applications.

Price and Minimum Order Quantity: 
Negotiable; inquiries welcome.