What Are Block BOPP Bags?
At first glance they look like vivid bricks; in reality they are flexible woven sacks engineered to stand upright. Block BOPP Bags—also called block-bottom BOPP woven bags or brick sacks—combine a polypropylene (PP) woven body with a biaxially-oriented polypropylene (BOPP) printed shell and a square gusseted base. The design delivers carton-like stacking with the lightweight strength of raffia, making these bags a favourite for rice, pet food, fertiliser, and powdered chemicals.
Key Features of Block BOPP Bags
Why are producers swapping pillow sacks for Block BOPP Bags? Three pillars define their appeal:
- Shape Retention – Square bottom and side gussets keep pallets tidy; bag expansion held to < 6 %.
- Visual Impact – Ten-colour rotogravure on BOPP achieves 150 dpi, turning each face into billboard real estate.
- Durability – 70–120 gsm woven PP fabric resists > 90 N puncture (ISO 7755) and supports 10–50 kg loads without tearing.
| Parameter | Typical Range | Test / Source |
|---|---|---|
| Width | 350–600 mm | Alibaba ID 1600994432100 |
| Length | 450–950 mm | Made-in-China ID fJ8bKcLqRVH2 |
| Bottom Width | 90–160 mm | Peer TDS, fertiliser grade |
| Fabric Weight | 70–120 gsm | SGS audit 2025 |
| BOPP Laminate Thickness | 18–25 µm | ASTM D6988 |
| Safe Load | 10–50 kg | ISO 21898 |
| Stack Compression | Pass 600 kg | ISO 2233, 24 h |
How Block BOPP Bags Are Made
VidePak starts with virgin PP pellets drawn into flat tapes on Austrian Starlinger FX 6.0 extruders, stretched at 1∶6.8 for maximum tensile strength. More than 100 circular looms weave the tapes into seamless fabric tubes at 160 rpm. German W&H coaters then apply a three-layer BOPP film—ink-trap, core, and heat-seal—at 290 °C. Ten-colour gravure presses print graphics with ±0.1 mm registration before the laminate is gusset-folded, block-bottom formed, and ultrasonically sealed. Each Block BOPP Bag receives a drop-test (0.8 m, full payload) and an air-leak inspection to guarantee seal integrity.
Where Block BOPP Bags Excel
Pet-food brands crave shelf pop; fertiliser exporters need cube efficiency; rice millers demand tear strength. Block BOPP Bags tick all three boxes. A Thai rice processor increased container fill by 14 % after switching, while a Brazilian kibble maker reported a 22 % sales lift due to improved graphics. The bags’ flat faces also simplify QR code scanning for traceability programs across the EU and Japan.
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Founded in 2008, VidePak operates 16 extrusion lines, 100 + looms, and 30 lamination & printing machines from W&H and Starlinger. With 568 employees and US $80 million annual sales, we customise Block BOPP Bags for clients on five continents—delivering strength, flexibility, and advanced material engineering in every brick-stable sack.
In today’s fast-paced world, packaging plays a vital role in ensuring the safe storage and transportation of goods. Block BOPP (Biaxially Oriented Polypropylene) bags have become a top choice in many industries because of their impressive strength, flexibility, and the advanced technology used in their production. These bags are designed to handle a wide range of products—from agricultural goods to retail items—ensuring their protection from damage during transit. This article highlights the key benefits of Block BOPP bags, their production process, and the technologies that make them stand out.
What Are Block BOPP Bags?
Block BOPP bags are made from polypropylene, a plastic material that is stretched in both directions to increase its strength and durability. This unique manufacturing process makes the bags tear-resistant, yet flexible enough to accommodate various shapes and sizes of products.
For instance, in the agricultural industry, Block BOPP bags are commonly used to package fertilizers and grains, where their ability to resist tears and punctures during transportation is crucial. Similarly, in retail, these bags provide excellent protection for consumer goods, such as snacks or dry foods, ensuring they remain intact and secure.
Quality Control and Standardization
The quality of Block BOPP bags is a major reason for their popularity. Manufacturers follow strict quality control measures to ensure that each bag meets high standards for strength and durability. One of the key factors contributing to their quality is the use of 100% virgin PP (polypropylene) and PE (polyethylene) pellets. Using fresh raw materials ensures that the bags have optimal strength and flexibility, as opposed to using recycled materials, which may lead to defects.
For example, in packaging food products, where safety is a priority, bags made from virgin PP and PE pellets are essential because they ensure the bags won’t tear or leak, thus preventing contamination.
Another important feature of Block BOPP bags is their adherence to positive tolerance standards. This ensures that every bag has consistent dimensions, which helps prevent issues like overfilled or underfilled bags that could burst. In industries like chemicals or construction, where bags are required to hold heavy loads, maintaining these standards is crucial for preventing failures.
Advanced Material Engineering
What truly sets Block BOPP bags apart is the advanced material engineering involved in their production. The use of high-quality equipment from industry leaders like Starlinger ensures that these bags are made with precision and consistency.
Starlinger machinery helps optimize the stretching of the polypropylene film, making the bags stronger without compromising their flexibility. This technology ensures that each bag meets precise thickness requirements, which is crucial for ensuring that the bags are both durable and flexible enough to handle various products.
For example, when shipping heavy items like cement or chemicals, these bags need to maintain their strength under weight. The precise engineering of Block BOPP bags ensures that they won’t break or tear, even under stress. Similarly, the flexible nature of these bags allows them to adjust to the shape of the contents, minimizing the risk of damage during transportation.
Custom Printing and Durability
Block BOPP bags also stand out for their ability to be custom printed with high-quality designs. The bags can be printed using flexographic printing, a process that ensures sharp, vibrant images that last for a long time. This is particularly useful for businesses that want to display their logos or product information on the packaging.
For example, many brands in the food industry use printed Block BOPP bags to showcase their products on store shelves. The high-quality print ensures that the branding remains visible and clear throughout the entire supply chain, even in challenging environments like high humidity or direct sunlight.
Moreover, the printing on these bags is durable, meaning it won’t fade easily over time, which is essential for maintaining brand visibility.
Advantages of Block BOPP Bags
- Strength and Durability
Block BOPP bags are known for their incredible strength. The biaxial stretching process gives the bags a high level of tear resistance, making them perfect for heavy-duty applications. Whether transporting chemicals or agricultural products, these bags hold up well under rough handling and harsh conditions. - Flexibility
Despite their strength, Block BOPP bags are also flexible. This flexibility makes it easy to handle and stack the bags, especially when packing them into containers or shelves. This versatility is useful for industries that need to ship products of various shapes and sizes. - Customization
These bags can be customized in various ways, such as different sizes, colors, and printing designs. This makes them ideal for businesses that want to enhance their brand’s visibility and create a distinct identity in the market. - Moisture and UV Protection
Block BOPP bags are also resistant to moisture and UV rays. This means they can protect sensitive products, such as food or chemicals, from environmental damage during storage and transport. For example, agricultural products that are sensitive to moisture can stay dry, even in rainy conditions. - Sustainability
The materials used in Block BOPP bags are fully recyclable, making them an eco-friendly option. By using high-quality, virgin materials, these bags can be recycled without compromising their performance, contributing to sustainable packaging practices.
Product Parameters
| Feature | Description |
|---|---|
| Material | 100% Virgin PP and PE pellets |
| Bag Type | Block BOPP bags |
| Thickness | Customizable based on product requirements |
| Printing | High-quality flexographic printing |
| Tensile Strength | High resistance to tears and punctures |
| Moisture Resistance | Excellent protection against moisture |
| UV Resistance | Protects contents from UV rays |
| Customization | Available in various sizes, colors, and prints |
FAQs
1. Why are Block BOPP bags stronger than regular polypropylene bags?
The biaxial stretching process used in manufacturing Block BOPP bags increases the tensile strength of the polypropylene, making these bags more durable and tear-resistant than regular polypropylene bags.
2. Can Block BOPP bags be customized with logos and designs?
Yes, Block BOPP bags can be printed with custom logos and designs using flexographic printing, which ensures the branding stays vibrant and clear for a long time.
3. How does Starlinger equipment improve the quality of Block BOPP bags?
Starlinger equipment provides precise control over the manufacturing process, ensuring that the bags are made to exact specifications. This leads to consistent strength and durability.
4. Are Block BOPP bags recyclable?
Yes, Block BOPP bags are made from recyclable materials, which makes them an environmentally friendly packaging option.
5. What industries benefit most from using Block BOPP bags?
Block BOPP bags are ideal for industries like agriculture, chemicals, retail, and construction, where durability, flexibility, and protection are crucial.
Conclusion
Block BOPP bags offer a perfect balance of strength, flexibility, and advanced material engineering. With their tear resistance, customization options, and ability to protect products from moisture and UV rays, these bags are ideal for a wide range of industries. The use of high-quality materials and precision manufacturing processes ensures that Block BOPP bags maintain consistent performance, making them a reliable choice for businesses looking to improve their packaging solutions.
For more information on the latest innovations in packaging, explore industrial woven packaging bags and the craftsmanship behind BOPP woven bags.