I. Core Challenges of Storage during the Rainy Season

During the rainy season, the humidity often exceeds 70%. Polypropylene staple fibers are prone to absorbing moisture, leading to a decline in performance (such as reduced strength and caking), and targeted protection is required.

Ii. Environmental Control Standards

Humidity management

The humidity in the warehouse is strictly controlled at 45% to 55%, and industrial dehumidifiers and temperature and humidity sensors are equipped for real-time monitoring.

The ground is covered with PE moisture-proof pads. The shelves should be at least 30cm away from the wall to prevent water seepage and condensation on the wall.

Temperature requirement

Maintain a constant temperature of 15-28℃, with a temperature difference of no more than 8℃ between day and night. Use the air conditioner to cool down during high-temperature periods.

Iii. Packaging Optimization Plan

Three-layer composite seal

Inner layer: aluminum foil moisture-proof film + middle layer: tear-resistant woven bag + outer layer: UV protective film. The sealing is double-sealed with hot melt adhesive and mechanical pressure strips.

The opened fibers have been processed

Repack the vacuum bags and place silica gel desiccant in each bag (suggested dosage: 1kg of fiber /10g of desiccant).

Iv. Stacking and Ventilation Specifications

Rainy season stacking restrictions

The stacking height should be no more than 5 layers, and a "well" shaped structure should be adopted, with a ventilation gap of 10-15cm left between layers.

Forced ventilation

Ventilate for at least 3 hours every day (avoiding the rainy period), and cover the top with a breathable dust-proof cover.

V. Emergency Measures for the Rainy Season

Emergency treatment for moisture damage

Activate the mobile dehumidification vehicle or the low-temperature drying lamp (temperature < 50℃) within 2 hours.

Mold prevention

The warehouse is disinfected monthly and the edges and corners of the fibers are inspected for clumping.

Vi. Transportation and Daily Maintenance

Transportation: The vehicle must be airtight and rainproof. Loading and unloading should avoid rainy days.

Inspection: Conduct random checks on the fiber status every week, with a focus on monitoring the underlying packages.

Precautions

Do not store together with acids, alkalis and other chemicals (volatile corrosive gases are prone to occur during the rainy season).

For long-term storage, it is recommended to unpack regularly (once every three months).

Through the above measures, the physical properties and processing applicability of polypropylene staple fibers during the rainy season can be effectively guaranteed. If you need professional support, you can consult Haian County Qinfeng Chemical Fiber Co., LTD.

Hai'an County Qinfeng Chemical Fiber Co., Ltd. specializes in production and sales：polypropylene staple fiber, polyester Staple Fiber, functional polypropylene staple fiber, functional polyester staple fiber, hydrophilic polyester staple fiber,  polypropylene, PP staple fiber, polyester staple fiber.