Multi-layer color-printed woven packaging bags with white coating on the valve opening

Applicable materials:
Tree whitewash, lime powder, calcium powder, putty powder, plaster powder, cement, dry-powder coatings, waterproofing powder, and other dry-powder construction materials.

Key features:
The valve opening is pre-formed, eliminating the need for manual bag support and reducing dust spillage by more than 90%. After filling, the valve seals automatically, obviating the need for additional sealing. The square-bottom design ensures stable stacking without tilting. A multi-layer composite structure provides excellent moisture resistance and leak-proof performance, safeguarding the quality of the whitewash. Filling speed ranges from 6 to 15 seconds per bag, making it ideal for high-speed production lines. Elegant printing enhances appeal, catering to both retail and construction markets.

Core Advantages:
High dust resistance (valve-mouth filling), high filling efficiency (6–15 seconds per bag), moisture and leak prevention, high strength due to multi-layer composite structure, alkali corrosion resistance, compatibility with high-speed filling lines, and no need for manual sealing.

Material and Craftsmanship:
The base material is a woven fabric made of PP (polypropylene) or HDPE (high-density polyethylene), with an inner barrier layer of PE film or aluminum foil (either laminated or co-extruded as an inner liner). An optional kraft paper outer layer can be added, creating a multi-layer composite structure. The bag style is a valve bag with a square bottom, and the valve type can be either a sleeve-style or a flip-top design. Printing is carried out using 2- to 7-color rotogravure color printing followed by lamination, resulting in vibrant, abrasion-resistant, and alkali-corrosion-resistant graphics.

Valve port structure:
Pre-formed valve mouth that automatically seals after filling, eliminating the need for additional sealing operations.

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, suitable for stacking and transporting loads weighing 10 to 25 kg.

Moisture resistance:
The water vapor transmission rate is reduced by more than 90% (in multilayer composite structures), effectively preventing the whitewash from absorbing moisture, caking, hardening, and losing efficacy.

Corrosion resistance grade:
★★★★★ (Highly resistant to alkaline components such as lime and cement, as well as additives.)

Packaging drop test:
With a 25 kg load and a 1.2-meter free fall, the product remains intact and does not leak powder after being dropped on all six sides.

Printing Standards:
Solvent-resistant ink, compliant with building-material packaging labeling standards. 100% barcode/QR code scan rate.

Customization Scope:
Multi-color overprinting of the brand logo, product name, net content, implementation standards, instructions for use, recommended mixing ratios, and precautions. Warning labels (e.g., “Moisture-Proof,” “Drop-Resistant,” “Keep Out of Reach of Children”), barcodes, QR codes, metrology marks, environmental recycling symbols, and usage illustration images may also be added.

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

Packaging specifications:
Customizable: loading weight (10 to 25 kg, with common options of 10 kg, 15 kg, 20 kg, and 25 kg), bag dimensions (length × width × bottom width), valve opening size (80–120 mm), inner-bag material (PE or aluminum foil), number of inner-bag layers, and print area.

Applicable to:
Whitewash manufacturers, lime powder processing enterprises, calcium powder plants, putty powder plants, dry-powder coating producers, and building-materials export traders.

Price and Minimum Order Quantity:
Negotiable; inquiries welcome.