Project summary
Paper cement sacks burst and soak up rain. Laminated woven PP block-bottom valve bags fill on the same packers, close dust-tight, stack square and survive wet sites.
The challenge
Cement, white cement and dry-mix producers fill tens of thousands of bags per shift on rotary valve packers. Paper sacks are cheap but fragile: they burst during palletising, tear in transit and absorb rain on open construction sites. Every broken bag is lost product, dust and a complaint.
The specification
- Fabric: woven polypropylene, PE-coated or BOPP-laminated for moisture resistance.
- Construction: square block bottom at both ends for brick-shaped, stable stacks.
- Valve: internal valve for standard cement; heat-sealable valve for premium and export products that must stay dust-tight.
- Fill: 25 kg and 50 kg formats sized to the packer spout.
- Print: brand, product grade, weight and safety information on all faces.
Why it works
- Fewer breakages. Woven PP is many times more tear-resistant than paper at a similar weight.
- Weather resistance. Coated and laminated fabric sheds rain on site.
- Same filling line. Bags are designed to run on existing valve packers.
- Stable pallets. Block bottoms stack square, reducing collapsed loads in trucks and containers.
Products used
Custom Logo Square Bottom Laminated PP Woven Waterproof, Heavy Duty Heat Seal Bottom Gusset Bag Valve Pocket 25KG and Square Bottom Gusset Bag with Valve Pocket Durable 25KG. See valve bags vs open-mouth bags.
