Block-bottom, valve-top, anti-static, UV-stabilized, UN-certified, and food-grade configurations. Engineered solutions for applications that go beyond standard woven PP bags.
All specifications are fully customizable. Contact us to discuss your exact requirements.
| Block Bottom | Sewn or glued square bottom for self-standing bags |
|---|---|
| Valve Top | Internal or external valve for automated filling equipment |
| Closure Options | Draw-cord, heat seal, pinch bottom, fold-and-stitch, valve |
| Anti-Static | Conductive threads or surface treatment, tested to IEC 61340 |
| UV Stabilization | UV inhibitors in PP resin, rated for 800+ hours accelerated exposure |
| Food-Grade | Virgin PP, CFIA and FDA compliant, certificate of conformance provided |
| UN Certification | Tested and marked per UN packaging standards for dangerous goods |
| PE Liner | 50 – 150 micron polyethylene, loose or form-fit |
| Foil Liner | Aluminium foil laminate for oxygen and aroma barrier |
| Base Fabric | Woven polypropylene, 60 – 120 GSM, coated or uncoated |
Valve-top bags are designed for automated bag-placing and filling systems that operate at high speeds with minimal dust emission. The valve accepts the filling nozzle, seals after filling through product weight compression, and eliminates the need for secondary closure operations. This configuration is standard in cement plants, dry-mix mortar facilities, and chemical powder packaging lines across Canada.
Products classified as dangerous goods under the Transportation of Dangerous Goods Act require UN-certified packaging that has been tested and approved for the specific hazard class. Sackora supplies UN-marked woven PP bags with the required drop, stack, and vibration test certifications. Anti-static treatment is added when the product or environment presents an ignition risk from electrostatic discharge.
Block-bottom bags with BOPP lamination and food-grade liners create a retail-ready package that stands on the shelf, displays branded graphics on a flat face panel, and protects product freshness. This configuration is used by specialty food producers, pet food brands, and agricultural co-operatives that sell directly to consumers or through retail distribution channels.
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Learn More →A block-bottom bag has a flat, rectangular bottom that allows the bag to stand upright on its own when filled. This creates a clean, professional appearance on retail shelves and pallets. Use block-bottom bags when your product is sold at retail, when you need stable pallet stacking without external support, or when your brand presentation requires a flat face panel for printed graphics.
A valve-top bag has a small opening (typically 10–15cm diameter) sewn into the top panel. The bag is placed on an automated bag-hanging system, a filling nozzle inserts into the valve, and product flows in under gravity or air pressure. When the target weight is reached, the nozzle withdraws and the valve self-closes under the weight of the product. No sewing, heat sealing, or manual closure is needed, which reduces labour and eliminates dust at the fill point.
UN certification requires that the bag pass a series of performance tests specified by the United Nations for the transport of dangerous goods. These include drop tests from a specified height, stacking tests under load, and vibration tests simulating transport conditions. The bag is then assigned a UN packaging code and marking that identifies the approved hazard class, packing group, and maximum gross weight. Sackora supplies bags with valid UN test reports and correct marking for Canadian TDG and international IATA compliance.
Yes. Specialty features are modular and can be combined. For example, you can order a valve-top bag with anti-static treatment and a PE liner, or a block-bottom bag with UV stabilization and food-grade certification. We will confirm compatibility during the quoting process and advise on any combinations that require specific engineering considerations.
PE (polyethylene) liners are the most common and provide moisture protection at low cost. They are available in loose-insert or form-fit configurations from 50 to 150 microns. Foil liners use aluminium foil laminated to PE and provide oxygen, moisture, and aroma barriers for the most sensitive products — coffee, spices, and hygroscopic chemicals. Your choice depends on the sensitivity of the product, required shelf life, and storage conditions. We recommend the minimum liner specification that meets your protection requirements to optimize cost.
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