Raffia grade PP granules (flat yarn grade PP resin) are the core raw material for producing high-quality PP woven bags widely used in grain packaging, fertilizer bags, cement bags, industrial packaging and agricultural packaging across Southeast Asia. Due to the special tropical climate of Thailand, Indonesia, Malaysia, Philippines and Singapore — high temperature, high humidity, heavy rainfall and strong ultraviolet radiation — ordinary PP granule production formulas often cause yarn breaking, brittle flat yarn, low tensile strength and fast aging of PP woven bags.

This article shares professional application precautions for raffia grade PP granules in PP woven bag production, tailored for Southeast Asian manufacturers, to improve finished bag quality, reduce defective rate and extend outdoor service life.

The performance of PP woven bags directly depends on the parameters of raffia grade PP granules. For the tropical humid and strong UV environment in Thailand, Indonesia, Malaysia, Philippines and Singapore, manufacturers must select qualified flat yarn grade PP particles with stable melt flow rate.

The most popular model for Southeast Asian woven bag factories is T30S (PPH-T03 raffia grade PP granules), which fits local production equipment and climate conditions perfectly.

• MFR (Melt Flow Rate): 2.5–3.5 g/10min (230℃/2.16kg). This is the core index for flat yarn extrusion. MFR higher than 3.5 causes thin and brittle PP flat yarn with poor tensile strength; MFR lower than 2.5 leads to hard extrusion, frequent yarn breakage and low production speed.
• Ash Content: ≤0.03%. Low ash raffia grade PP granules ensure clean flat yarn without black spots and particle impurities, avoiding broken yarn during high-speed weaving.
• Moisture Content: ≤0.02%. Southeast Asia has long rainy seasons and high air humidity. High moisture in PP granules will produce bubble holes in flat yarn during extrusion, resulting in defective woven bags.
• Tensile Strength: ≥38MPa. Guarantee heavy-load bearing capacity for rice bags, fertilizer bags and industrial PP woven bags.

Many woven bag factories in Indonesia, Thailand and Malaysia mix recycled PP granules to control costs. However, improper mixing will greatly reduce the weather resistance of PP woven bags in tropical climates.

• Food-grade packaging woven bags (rice, sugar): 0% recycled material, use pure virgin raffia grade PP granules.
• Industrial woven bags: recycled PP ratio ≤30%–40%. The MFR of recycled material must match virgin T30S PP granules to avoid uneven yarn thickness and strength attenuation.

Excessive recycled materials will cause PP woven bags to age, fade and crack quickly under strong UV in Malaysia, Thailand and Philippines outdoor storage scenarios.

Southeast Asian tropical weather (average ambient temperature 30–38℃, humidity over 80% in rainy season) is completely different from temperate regions. Standard production parameters need targeted adjustment for raffia grade PP granule processing.

Recommended temperature range: 220℃–250℃, die head temperature 230℃–240℃. In rainy seasons of Indonesia and Philippines with extreme high humidity, increase the overall extrusion temperature by 5–10℃ to fully plasticize raffia grade PP granules and eliminate moisture-induced bubble defects.

Do not exceed 260℃, otherwise PP molecular chain degradation will occur, causing yellowing yarn and brittle woven bags.

In hot summer of Thailand, Malaysia and Singapore, ambient temperature remains high all year round. The cooling water temperature of flat yarn production should be controlled at 30℃–35℃ (lower than standard temperate zone parameters) to ensure uniform crystallization of PP flat yarn, reduce shrinkage and prevent finished woven bags from wrinkling and deformation.

Virgin raffia grade PP granules stretching ratio: 7.0–8.0 times; recycled mixed material: 5.0–6.0 times. In high humidity environments, properly increase stretching oven temperature by 5–10℃ to optimize molecular orientation, significantly improving the tensile strength and tear resistance of PP woven bags.

During the long rainy season in Southeast Asia, raffia grade PP granules easily absorb moisture. Before production, dry granules at 80℃–100℃ for 2–4 hours to reduce moisture below 0.02%. This step can reduce the defective rate of PP flat yarn by more than 15%.

Strong ultraviolet radiation is the biggest killer of PP woven bags in Southeast Asia. Ordinary raffia grade PP granules without additives will age, become brittle and lose strength in 3–6 months of outdoor use. Reasonable additive configuration is essential for local woven bag manufacturers.

• UV Stabilizer (0.2%–0.5%): Add UV-531 or high-efficiency composite UV stabilizer to raffia grade PP granules, effectively resisting strong UV rays in Thailand, Malaysia and Philippines, extending the outdoor service life of PP woven bags to 12–24 months.
• Antioxidant (0.1%–0.3%): High temperature in tropical areas accelerates PP oxidation and yellowing. Adding antioxidant B215 can prevent thermal aging during processing and long-term storage.
• Weather-Resistant Masterbatch: Use carbon black or titanium dioxide weather-resistant masterbatch instead of ordinary color masterbatch, to avoid color fading and surface pulverization of PP woven bags.

Improper storage in high-temperature and high-humidity environments in Singapore, Indonesia and other regions will cause performance attenuation of raffia grade PP granules before production.

• Store PP granules in dry and ventilated warehouses, keep humidity below 60%, and use dehumidifiers during rainy seasons.
• Place granule pallets off the ground to prevent ground moisture penetration and moisture absorption.
• Avoid long-term direct sunlight exposure during transportation, use covered containers or trucks to prevent early aging of PP raw materials.
• Sealed raffia grade PP granules have a valid storage period of 6–12 months in Southeast Asian climate.

Combined with the actual production feedback of woven bag factories in Southeast Asia, we summarize common quality problems caused by improper use of raffia grade PP granules and targeted solutions:

For PP woven bag manufacturers in Thailand, Indonesia, Malaysia, Philippines and Singapore, the core of stable product quality is to select low ash, stable MFR raffia grade PP granules (T30S), adjust extrusion and cooling processes adapted to high temperature and high humidity climate, and match professional anti-UV and antioxidant additives. Standardizing raw material storage and production operation can effectively reduce defective products, improve the weather resistance of PP woven bags, and enhance market competitiveness in the Southeast Asian packaging industry.