BOPP Laminated Woven Bag with Block Bottom

Made by Starlinger Ad star machine, bags with Block bottom and valve mouth, either back seamed or tubur construciton. Typical specification is 70GSM scrim+18GSM lamination+18GSM glossy or matt BOPP, and we have different quality level of high-friction for customer’s selection. Up to 9 colors with roto gravour printing. Carton palletized package for full automatic filling process.

 

 

Structural design for block bottom stability

This bag adopts a “block bottom” form that gives it a stable rectangular base. The body is composed of polypropylene woven fabric laminated with BOPP film, combining the strength of pp woven bags with surface protection from bopp packaging. The block bottom aids stacking and load distribution, reducing deformation under filled weight. Because of lamination, the bag also resists moisture intrusion and maintains dimensional stability, which is often required when bopp laminated woven bags carry granular or powdered bulk goods. The reinforced rectangular base helps in automated filling lines and in palletized shipping, making this design preferred among bulk bag suppliers who demand consistency across many units.

 

Materials, printing and finishing options

The laminated composite construction uses virgin polypropylene woven cloth plus BOPP layers. The lamination supports high-fidelity multicolor printing directly on the surface, enabling brands to place logos or instructions without needing external labels. Printing can be applied to the outside BOPP surface. Top and bottom finishing methods vary: the top can be heat cut, cold cut, or hemmed; the bottom is formed into the block shape and sealed by stitching or other sealing methods. Customers can choose gloss or matte BOPP finishes and anti-slip surface treatments to match handling conditions. The finished bopp bag can thus meet both strength and visual branding demands with the structural integrity of a pp woven bag at its core.

 

Manufacturing and packaging workflow

The production runs from weaving to lamination to bag making in a streamlined process to maintain uniform quality. The block bottom design helps simplify the filling process in factories, and bags are typically palletized for transport. This packaging method aligns with automated filling lines to reduce manual handling. Quality checks are performed to ensure fold accuracy, lamination adhesion, and base integrity. For industries handling bulk flows—such as agriculture, chemicals, or raw materials—these pp woven sacks with block bottoms offer an operationally efficient and structurally reliable packaging option.

 

 

 

Product Advantages
 

Structural and System Design Strengths

The design of UNIPACK's polypropylene woven bags reflects comprehensive engineering coordination by a reputable pp woven bags manufacturer and bopp film laminated manufacturer, delivering a robust packaging system structured for bulk handling. Key features such as the block-bottom configuration provide a self-supporting base that enhances stackability and minimizes deformation. The multi-layer construction combining woven polypropylene with advanced BOPP lamination optimizes the balance between tensile strength and moisture resistance. Finishing options, including heat or cold cuts and hems, allow customization tailored to various filling and sealing machinery, facilitating adaptability to diverse industrial packaging lines. This integration capability ensures that the system meets stringent operational requirements for durability and consistency.

 

Performance, Usability, and End-User Value

From a performance perspective, these bags offer excellent tensile strength and moisture barrier properties essential for protecting bulk materials in transit and storage. The laminated surface produced by a leading bopp film laminated manufacturer enables high-quality printing, critical for compliance labeling and brand differentiation. The ergonomic block-bottom design supports efficient handling and transportation, reducing labor and damage-related costs. For users, the reliable performance under mechanical stress and exposure to environmental factors translates to minimized material loss and enhanced packaging lifecycle, contributing positively to operational cost-efficiency. The product’s compatibility with automated filling equipment further streamlines workflows, reducing downtime and ensuring consistent throughput in industrial packaging facilities.

 

 

Use Scenarios

Agriculture and seed packaging

Users of seeds, fertilizers or grains require strong, stable bags that protect contents and enable clear branding. The block bottom variant supports stacking in storehouses, and the bopp laminated bags permit direct printing of product information and brand identity. The pp woven sack structure resists tears while the lamination shields contents from moisture during storage and transport.

 

Industrial materials and powders

In sectors such as chemicals, minerals or construction additives, materials often demand rugged packaging. Using block bottom pp woven bags, manufacturers can ensure stability during filling and handling. The lamination protects against leakage or contamination. With printed surfaces, bopp laminated woven bags offer traceability and compliance labeling directly on the bag.

 

Retail bulk and consumer product packaging

For bulk food items, pet feed or grain sold in large retail packs, these bags offer both strength and aesthetic appeal. The stable base helps them sit upright on shelves, and brands can present neat packaging with high-quality printing. The combination of pp woven laminated bag structure and bopp packaging surface supports consumer visibility while maintaining industrial robustness.

 

 

 

About Us

 

UNIPACK is a packaging enterprise founded in 2005 with deep experience in woven plastic solutions. Our operations are based in Jiangsu, with production facilities in Shandong, Anhui, Zhejiang, plus overseas lines in Vietnam and Cambodia.

 

Our specialization includes pp woven bags, bopp laminated woven bags, block bottom structures, and related packaging for sectors such as agriculture, chemicals, and industrial goods. We control the full production chain—fabric weaving, lamination, printing and bag forming—to maintain consistency and reliability. As one of the professional bopp bags manufacturers, we commit to timely delivery, open communication and stringent inspection to ensure product quality across markets.

 

 

 

FAQ

 

What materials are used in your PP woven bags and how do they benefit industrial packaging?

We use virgin polypropylene woven fabric as the core material, combined with BOPP film lamination. This composition provides durable strength, moisture resistance, and enhanced printing capability, which is essential for industrial packaging, palletizing, and long-term storage needs. Our role as a pp woven bags manufacturer ensures reliability.

 

Can I order customized sizes and printing for BOPP laminated woven bags?

Yes, we offer full customization for size, finishing, and multi-color printing up to 9 colors on the bopp bags exterior surface. Our OEM services allow you to tailor bags for specific industrial applications, including block-bottom structures for stacking stability and branding requirements.

 

How do you ensure product quality and timely delivery of wholesale polypropylene woven bags?

We control the entire production chain—from weaving polypropylene fabric to lamination, printing, and bag formation. This oversight ensures consistent manufacturing standards and reliable delivery schedules. Typically, lead times range from 30 to 60 days based on bag type and order volume.

 

What shipping and payment terms do you provide to international buyers?

We support widely accepted trade terms including FOB, CIF, and DDP to accommodate different logistics needs. Payment terms generally require a 30% deposit with the balance due before shipment. Our experience as a bopp film laminated manufacturer helps us streamline international trade processes efficiently.