Preventing Mold in Wood Storage During the Rainy Season: A Guide for Plywood Manufacturers
The mold-prone season from 6 to 7 each year is peak time for board factories. This article provides an actionable anti-mold checklist covering pre-storage treatment, stacking methods, and warehouse conditions to help keep mold rates below 2% during high-humidity months.
During the rainy season, warehouse humidity stays above 75% year-round, marking the period with the highest risk of mold. Preventive measures must focus on three key stages: 1. Pre-entry Treatment: Apply wood preservative to boards within 24 hours after kiln drying, using a water dilution ratio of 1:50-1:100. Spray thoroughly, focusing on edges, end grains, and exposed glue lines. Ensure treated board moisture content remains below 18%. 2. Stacking Method: Elevate stacks at least 15 cm off the floor and 30 cm from walls. Maintain ventilation gaps of 10-15 cm between stacks; never stack tightly against walls or floors. Store batches separately, apply FIFO (first-in, first-out), and avoid burying older stock at the bottom. 3. Warehouse Environment: Use industrial dehumidifiers or ventilation systems to keep relative humidity below 60%. Conduct inspections twice daily (morning and evening), prioritizing internal and lower layers of stacks. If white mold or spots appear, treat locally with wood mold remover and isolate affected boards. Where budget allows, cover stack tops with moisture-proof tarps—but leave side vents open for airflow. After the rainy season, perform a full stack inspection and immediately remove problematic boards to prevent carryover into autumn orders. Following these steps ensures mold rates stay under 2% even in high-humidity southern regions. — Suqian Mudun New Material Technology Co., Ltd.
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Learn more about wood mold prevention, anti-corrosion, and blue stain removal.
Basics of Wood Mold Prevention
Wood mold is caused by the proliferation of mold spores under favorable conditions. Mold growth requires three essential elements: nutrients, moisture, and suitable temperatures. Wood contains abundant cellulose, hemicellulose, and lignin, which serve as natural nutrient sources for mold. When wood moisture content exceeds 20%, mold spores germinate on the wood surface, forming visible mold spots.
Different tree species have varying mold risks. According toChinese Academy of ForestryResearch shows that poplar, with its low density and large pores, absorbs water quickly but dries out rapidly. Pine species (such as Masson pine and Chinese white pine) contain high levels of resin; the oily layer hinders moisture evaporation, causing internal areas to remain highly humid for extended periods and significantly increasing the risk of mold. Select an appropriateWood Mold InhibitorConsider wood species, moisture content, and application scenario.
Wood Mold Inhibitor Selection Guide
When selecting a wood mildewcide, evaluate it across three key dimensions. Mildew efficacy testing can follow:GB/T 18261-2013 "Test Method for Evaluating the Efficacy of Fungicides Against Wood Mold and Discoloration Fungi"method. When selecting a product, penetration is the primary factor; the fungicide must penetrate deep into the wood to establish lasting protection. Water-based fungicides offer strong penetration and are ideal for immersion treatment. Powdered types require thorough dissolution before use, while emulsion types are best suited for surface spraying.
Next is environmental compliance. Exported products must meet the environmental regulations of the destination country, such as the EU's PPWR and import standards in Southeast Asian countries. Finally, consider the protection cycle. Different usage scenarios require different levels of durability; indoor wood storage and outdoor wooden pallets need entirely different protection ratings. MuDun anti-mildew agent provides a complete MSDS and test reports to support...Southeast Asia Foreign Trade Exports。
Wood Mold Prevention Construction Methods
In actual production, wood anti-mold agents are primarily applied using the immersion method. After diluting the agent with water according to the specified ratio, fully immerse the wood in the solution for 3-5 minutes to ensure thorough penetration into the wood interior. Once removed, drain excess solution. The wet wood can proceed directly to subsequent processing steps without waiting to dry.
For large timber or assembled wooden pallets and boards, surface treatment can be applied via spraying or brushing. Wear protective gloves and a mask during application, and ensure the work area is well-ventilated. Water absorption rates and oil content vary by wood species (e.g., poplar, pine, slash pine, larch, mixed hardwood), so adjust the chemical concentration and soaking time accordingly. Learn moreTechnical Solution。
Wood Export Mold Prevention Requirements
Wood products for export typically require mold prevention treatment and supporting technical documentation. Common compliance documents include MSDS (Material Safety Data Sheet), test reports, and declarations of conformity. Mold prevention requirements vary by country and region; the Southeast Asian market primarily focuses on PPWR regulation compliance. Learn moreExport Service Details。
Mildewproofing effect reference for wood mold inhibitorGB/T 18261The testing methods described herein provide comprehensive export compliance documentation, meeting environmental regulations of major Southeast Asian wood-importing countries such as Malaysia, Vietnam, Thailand, and Indonesia. Exporters may refer toState Forestry and Grassland AdministrationPublish the wood export guide, prepare relevant documents in advance, and ensure smooth customs inspection.
