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PP woven bags (polypropylene woven bags) are multi-functional packaging containers made from polypropylene (PP) plastic flat yarns through weaving technology. With their high strength, light weight, corrosion resistance and environmental friendliness, they have become core packaging materials in agriculture, industry, construction and other fields. The following is a systematic introduction from core characteristics, technical parameters, application scenarios and purchasing points:
I. Core Features and Advantages
1. High Strength and Durability
Tensile strength ≥ 30kN/m (in accordance with national standard GB/T 8946), load-bearing capacity ranging from 20 to 2000kg, superior puncture and tear resistance compared to paper bags.
Strong weather resistance: outdoor service life ≥ 2 years after adding UV stabilizers, freeze-resistant and corrosion-resistant, suitable for harsh environments.
2. Lightweight and Cost Advantage
Gram weight range 45–160g/㎡, 30% lighter than traditional packaging, unit price only 0.5–3 yuan per piece (50kg capacity), cost is only 1/3 of that of jute bags.
3. Functional Diversity
Breathable and waterproof: mesh density adjustable (5×5 to 14×14 mesh), balancing ventilation and moisture-proofing (e.g., onion bags with 8×8mm mesh reduce rot rate by 30%).
Environmentally friendly and recyclable: 100% recyclable, some products use recycled PP material (30–50% content) or PLA blends, with a degradation rate of ≥90% within 180 days.
II. Technical Parameters and Specifications
Key Parameters Table
| Parameter | Range | Example Application |
| Grammage | 45–200g/㎡ | 00g/㎡ can bear 50kg (feed bag) |
| Size | Width: 25–600cm, Length: customizable | Standard fertilizer bag: 45×80cm |
| Denier | 600D–2200D (flat filament fineness) | 1500D for heavy-duty sand and gravel bags |
| Surface Treatment | OPP coating / pearlescent lamination / UV protection | Coating enhances moisture resistance (fertilizer bags) |
Process details
Weaving method: Circular knitting machine (seamless tubular)
Post-treatment: The bag opening can be heat-sealed, threaded or sewn at the bottom; printing supports 9-color customization (screen printing / heat transfer printing).
III. Application Scenarios and Solutions
1. Agricultural Sector (60%)
Grain Packaging: 25/50kg moisture-proof laminated bags, meeting food-grade GB 4806 standards.
Fruit and Vegetable Transportation and Storage: Woven mesh bags (e.g., 8×8mm mesh) for breathability and freshness preservation, reducing compression damage.
2. Industrial and Construction (30%)
Chemical Raw Materials: Acid and alkali-resistant PP bags for loading fertilizers and resins, with anti-leakage powder design.
Geotextiles: 2.5m wide anti-seepage fabric, tensile strength ≥ 35kN/m (for water conservancy projects).
3. Retail and Innovative Applications
Environmentally Friendly Shopping Bags: Layered PP + zipper design, foldable and storable, reusable hundreds of times.
Smart Bulk Bags: Embedded RFID tags for logistics traceability (in the chemical and grain industries).
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IV. Purchasing and Customization Guide
1. Selecting by Scenario
Heavy-duty packaging (mineral sand/construction materials): Choose round-woven fabric + 100g/㎡ weight + reinforced base fabric.
Ventilation requirements (fruits/vegetables/aquatic products): Choose warp knitted mesh bags + HDPE material (e.g., 8×8mm mesh).
Moisture-proof and sealed (food/fertilizer): Choose flat-woven bags + PE inner liner film (0.02–0.04mm thickness).
2. Customization Options
Parameter customization: Mesh density, weight, size (supports 25–150cm width and any length).
Printing and processing: Colorful LOGO printing (≤9 colors), UV protective layer, zipper/handle reinforcement.
3. Quality Inspection
Identification and certification: Check QS mark, execution standards (e.g., GB/T 8946).
Strength test: High-quality bags have flat yarns that are not easily torn longitudinally, and the film does not delaminate after boiling in water for 30 minutes.
V. Environmental Protection Trends and Innovation Directions
Recycled Materials: Recycled PP accounts for 30–50%, with a 20% cost reduction (conforming to GB/T 39199 standard).
Lightweighting Technology: Ultra-fine denier flat yarn (500 denier) achieves a 70g/㎡ high-strength alternative to the traditional 80g/㎡.
Smart Production: Internet of Things (IoT) monitors tension and speed, reducing defective product rate to 0.5%.
Summary
PP woven bags have become the cornerstone of the packaging industry due to their high strength, light weight, and multi-functionality. Their core values lie in:
Scene adaptation: From moisture-proofing grains to allowing fruits and vegetables to breathe, the structure can be flexibly customized;
Environmental upgrade: Degradable materials and recycled materials promote green transformation;
Intelligent efficiency improvement: RFID traceability and automated production reduce costs and increase efficiency.
When purchasing, it is necessary to comprehensively consider the load-bearing requirements, environmental adaptability, and certification standards (such as ISO 9001), and give priority to suppliers that provide process support.
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