COSEK black moisture-proof ton bag for grain/feed/chemical raw materials waterproof packaging

1. Dual Moisture Protection: An Effective Barrier Against Water Intrusion

The core function of COSEK moisture-proof bulk bags is "moisture resistance": the outer layer is made of black PP woven fabric (with 2% UV inhibitor added to effectively block ultraviolet rays and prevent material oxidation due to light exposure), while the inner layer consists of a 0.08mm thick PE impermeable membrane (permeability coefficient ≤10⁻¹⁷ m²/s, equivalent to an "invisible raincoat"). These two layers are bonded together with hot-melt adhesive, forming a dual protection system of "physical isolation + chemical barrier." Even in environments with humidity above 90%, the relative humidity inside the bag can remain below 60% (test conditions: 25°C, 90% humidity, 72 hours), effectively solving issues like grain mold and feed clumping. The "drawstring + sealing strip" design at the bag opening (blue drawstring paired with a rubber sealing strip) further enhances airtightness, with a leakage rate below 0.05%.

2. Durable & Anti-Aging: Long-Life Design for Harsh Environments

To withstand challenges such as high temperatures and UV exposure during outdoor transportation, this bag's material formula has been specifically optimized: the black PP woven fabric contains an antioxidant (content ≥0.3%), effectively delaying material aging (aging test: exposed to UV for 1000 hours, strength retention rate ≥85%). The handles are made of blue nylon webbing (with UV-resistant fibers), ensuring no fading or brittleness even after prolonged sun exposure. Field tests show that this bag can be used continuously for over 3 months in outdoor conditions (with two loadings/unloadings per month), whereas standard bags last only 1 month—a 200% increase in lifespan.

3. Transparent Sampling Window: Enhancing Inventory Management Efficiency

The "transparent PE sampling window" (30cm × 20cm) in the middle of the bag is one of this product's innovative features: operators can take small samples for quality inspection (e.g., checking grain moisture or feed freshness) without opening the bag, simply by unzipping the sampling window. This avoids frequent bag openings that could lead to moisture intrusion. The sampling window edges are "heat-sealed" (to prevent zipper detachment) and come with a "dust cover" (can be closed when not in use), ensuring both convenience and hygiene. Customer feedback indicates that using the transparent sampling window reduces inventory inspection time by 50% and error rates by 30%.

4. Customization Services: Tailored Solutions for Special Needs

We offer in-depth customization to meet the moisture-proof needs of different industries:  
- For grain companies: "Vent valves" can be added (to balance internal pressure and prevent bag swelling), along with printed "grain storage guidelines" (e.g., "Keep away from humid environments").  
- For feed companies: The thickness of the PE membrane can be adjusted (0.06mm–0.1mm) based on the feed's hygroscopicity.  
- For chemical raw material companies: "Anti-static coatings" can be applied (resistance ≤10⁸Ω, preventing electrostatic sparks from causing explosions).  
All customized products undergo "moisture-proof performance testing" (GB/T 32654-2016 "Flexible Intermediate Bulk Containers") to ensure they meet customer expectations.

5. Technical Specifications: Data-Backed by Authoritative Testing