What are pre-opened poly bags?
Core Advantages
- Low Cost
- High Efficiency
- Broad Adaptability
Material of Pre-Opened Poly Bags
The bags are made from 100% virgin LDPE (Low-Density Polyethylene) with the following characteristics:
Safe and Eco-Friendly
Made from pure virgin resin with no odor, impurities, or excessive plasticizers. Compliant with food contact tests and EU environmental regulations, suitable for ordinary foods, daily necessities, and baby products. Meets international import standards, reducing customs clearance risks.
Flexible and Tear-Resistant
Excellent tensile strength, resistant to stretching and puncturing, and remains intact under low temperatures. Ideal for cold chain transport, long-distance shipping, and air freight without cracking or damage.
High Transparency & Smooth Surface
Clear, flat film enhances product display, suitable for e-commerce premium packaging and export shipments.
Easy to Seal
Excellent heat sealing performance; supports heat sealing, tying, stapling, and tape sealing. Fully compatible with automated packaging lines.
Weather-Resistant
Moisture-proof, dust-proof, corrosion-resistant, and optional UV-resistant formulations available for outdoor storage.
Lightweight & Cost-Efficient
Thin and lightweight design reduces logistics costs for cross-border shipping, offering superior cost-performance compared to similar materials.
Features of Pre-Opened Poly Bags
Advantages of Pre-Opened Poly Bags
Efficiency
No manual bag opening required; efficiency increased by over 60%, reducing labor costs.
Low Damage Rate
Precision sealing and virgin material reduce damage rate to below 0.1%, far lower than average.
Cost-Effective
Factory-scale production and lightweight design reduce shipping costs significantly.
Compatibility
Standard 3-inch paper core compatible with global automatic packaging equipment.
Quality Control
Consistent bag count, spacing, and open-mouth alignment enhance presentation.
After-Sales Advantage
Export packaging prevents damage; large orders prioritized for strict deadlines.
Pre-Opened Plastic Bag Styles
By Opening Type:
1. Standard Pre-Opened (Most versatile) | 2. Wide Opening (For irregular items) | 3. Slit-Front (For high-speed line operations)
By Function:
· Transparent Standard (Apparel, stationery) | · Ventilated (Prevents bag bulging) | · Anti-Static (Electronics components) | · UV-Resistant (Outdoor storage) | · Heavy-Duty (Thick, puncture-resistant for tools)
By Appearance:
· Clear Transparent (Best display) | · Milky White (Privacy, light-blocking) | · Colored Custom (Black, blue, red for sorting)
By Seal Type:
· Flat Bottom (Even weight distribution) | · Reinforced Side Seal (Extra strength for heavy items)
Standard Size & Thickness Reference
Custom sizes and thicknesses are available upon request.
| Bag Size (W × L, Inch) | Thickness (Microns) | Recommended Applications | Quantity Per Roll |
|---|---|---|---|
| 3 × 5, 4 × 6 | 38 – 50 μm | Jewelry, small accessories, screws, tiny electronic parts, beauty tools | 2,000 pcs |
| 5 × 8, 6 × 9 | 38 – 76 μm | Stationery, small daily goods, toy parts, masks, accessory packaging | 1,500 pcs |
| 8 × 10, 8 × 12 | 50 – 76 μm | Garment accessories, footwear accessories, household items, digital accessories | 1,200 pcs |
| 10 × 12, 10 × 15 | 50 – 102 μm | Clothing, home textiles, gifts, medium-sized industrial parts | 1,000 pcs |
| 12 × 15, 12 × 18 | 76 – 102 μm | Large garments, bags, medium-duty hardware, household products | 800 pcs |
| 15 × 20, 18 × 24 | 76 – 152 μm | Heavy-duty industrial parts, tools, outdoor products, large household goods | 500 pcs |
Applications Across Industries
Production Process
1. Raw Material Screening: 100% virgin LDPE/HDPE, quality testing for transparency and environmental compliance.
2. High-Temperature Blown Film: Automated high-temp extrusion ensures uniform thickness.
3. Cooling & Forming: Temperature-controlled to maintain flexibility and prevent deformation.
4. Cutting & Trimming: CNC precision ensures neat edges, no burrs.
5. Pre-Opened Forming: Specialized equipment guarantees consistent open-mouth tension.
6. Counting: Smart control for accurate roll quantity.
7. Neat Rolling: Standard 3-inch paper core, aligned bags.
8. Quality Inspection: Check thickness, size, seal strength, open-mouth, transparency, load-bearing.
9. Dust Removal: Ensures clean, export-ready product.
10. Individual Packaging: Moisture-proof, protective wrapping + carton reinforcement.
11. Storage & Shipment: Organized warehouse, batch management, fast shipment.
Quality Control
· Process Monitoring: Real-time thickness, seal, and tension monitoring.
· Physical Testing: Tensile, puncture, seal, low-temp, expansion tests.
· Compliance Certification: ISO9001, FDA, USDA, EU REACH.
· Batch Sampling: Retained samples for traceability.
· Pre-Shipment Inspection: Double-check specifications and quantity.
Printing Technology
· Single/Multicolor Printing: 1–6 color options for logos, barcodes.
· Hot Stamping: Optional gold/silver for high-end branding.
· Anti-Counterfeit Codes: Batch numbers, QR codes, serial numbers.
OEM/ODM Customization
Factory Strengths & Pricing
Factory Direct Advantages: 10+ years exporting, fully automated production lines, daily capacity of millions of rolls. Supports full container and small-batch orders. In-house export team familiar with global customs and clearance procedures.
Price Advantages: Mass production reduces cost; tiered pricing for bulk orders. No middlemen, 10–20% cheaper than competitors. Lower shipping costs due to lightweight design. Special discounts for long-term clients and bulk repeat orders.
Why Choose Us
Frequently Asked Questions
Q1: Are the bags made from virgin material?
A: Yes, 100% virgin LDPE/HDPE; recycled material can be added per request.
Q2: Can you customize sizes and print logos?
A: Yes, full customization of size, thickness, printing (single/multi-color), text, and pattern.
Q3: Which machines are compatible?
A: Standard 3-inch core compatible with global automatic machines, Autobag series, high-speed baggers.
Q4: Are the bags durable and accurately counted?
A: Automated counting and reinforced seals; damage rate <0.1%.
Q5: Are samples free and how fast can they be made?
A: Standard samples free, shipping cost applies; custom samples ready in 1–3 days.
Q6: How long is the delivery time for bulk orders?
A: 15–35 days for custom orders; rush orders prioritized.
Q7: Can mixed specifications be shipped in one container?
A: Yes, supports mixed sizes, thickness, and styles in one shipment.
