In the industrial handling and international trading of ultra-sensitive commodities in 2026—such as refined white sugar, hygroscopic chemical additives, powdered caustic soda, milk powder, and fine minerals—complete barrier isolation against ambient humidity, dust leakage, and microbial exposure is essential. A minute trace of moisture ingress can cause extensive powder caking and structural spoilage of an entire shipping container. SherkatTrade manufactures heavy-duty 50kg PE Lined Woven Polypropylene (PP) Sacks at our specialized polymer textile complex in Isfahan, combining the superior mechanical tensile strength of a woven outer sack with the absolute hermetic impermeability of an internal virgin polyethylene liner.
Our manufacturing lines utilize 100% pure virgin food-grade low-density polyethylene (LDPE/LLDPE) to extrude tubular inner liners ranging from 25 to 50 microns in thickness. These liners are pre-inserted and aligned within the outer woven PP sack with automated precision, preventing twisting, bunching, or snagging during high-speed automated packing spout operations.
Every production run is calibrated under strict ISO 9001 and ISO 22000 food packaging quality systems:
| Industrial Sector | Typical Fill Commodity | Critical Necessity of Dual-Layer Construction |
|---|---|---|
| Sugar & Sweeteners | Refined white sugar, raw cane sugar, powdered dextrose | Stops caking and prevents sugar crystals from bonding to outer woven tapes |
| Petrochemicals & Resins | Powdered polymers, sensitive masterbatches, caustic soda | Hermetic containment blocking toxic dust escape and atmospheric hydration |
| Specialty Minerals & Clays | Kaolin, micronized bentonite, calcium carbonate | Eliminates fine particle sifting, maintaining clean shipping containers |
| Food & Dairy Ingredients | Industrial milk powder, whey protein, gluten, egg powder | Preserves delicate amino acids and lipids against oxidation and mold |
The seamless virgin polyethylene liner acts as an impermeable physical barrier, keeping sensitive sugar and chemical powders bone-dry during maritime transport.
Because the internal liner is a continuous solid film with zero weave gaps, micron-sized powders cannot puff out through the sack walls during handling.
Packers can independently heat-seal the inner PE liner mouth before sewing the outer woven bag, creating an airtight, tamper-evident double closure.
Food-grade commodities touch only the pristine, sterilized virgin polyethylene liner, completely isolated from external handling contamination.
| Quality Parameter | SherkatTrade 50kg PE Lined Sack | Standard Unlined PP Sacks | Low-Grade Recycled Liner Sacks |
|---|---|---|---|
| Moisture & Humidity Barrier | 100% Hermetic & Waterproof | Rapid moisture seepage through weave | Pinhole leaks in brittle recycled liner |
| Hygienic Purity & Odor | 100% Virgin Food-Grade, odorless | Direct contact with woven tapes | Pungent burnt chemical plastic smell |
| Liner Alignment in Packing | Precision aligned, no bunching | No liner present | Liner bunches up at the bottom |
| Outer Fabric Tensile Strength | > 850 N / 50 mm | < 600 N / 50 mm | < 500 N, rapid tear propagation |
| Bottom Seam Reliability | Double-fold with dust-proof cord | Simple single-thread chain stitch | Splitting liner seam causing total spill |
No, SherkatTrade formulates the inner liner with high puncture-elasticity polymers that flex under heavy-gauge needles without running or splitting along the stitch line.
Standard plain lined sacks start from 1 export bale (1,000 bags), while custom-printed orders start from 3,000 bags.
Yes, we can tailor the liner thickness from 20 microns up to 60 microns based on the density and sensitivity of your product.
Contact the SherkatTrade industrial packaging export department for technical datasheets, sample packs, and firm volume quotations:
| Dimensions | 60x100 cm |
| Weight per Bag | 110g (including liner) |
| Material | Standard Woven Polypropylene |
| Color | Pure White |
| Printing Type | Flexographic Printing |
| Load Capacity | 50 kg |
| Closure Type | Double Sewn Bottom |
| UV Treatment | Yes |
| Food Grade | Yes |
| Custom Size Available | Yes |
