VidePak, founded in 2008 and based in Shanghai, is one of China’s top industrial bag manufacturers. With over 17 years of experience and 500+ employees, VidePak specializes in heavy-duty packaging solutions. As a TOP-5 Chinese Polypropylene Woven Bags manufacturer, the company serves a global clientele in construction, agriculture, chemicals and food industries. VidePak combines premium raw materials, advanced equipment, and strict quality controls to deliver reliable PP woven sack products at an annual output of 300 million pieces. Its products are engineered according to international standards (for example, ASTM and ISO guidelines) to meet diverse industrial needs.
Premium Raw Material Sourcing
VidePak emphasizes the use of high-grade, 100% virgin polypropylene resin to ensure consistent bag performance. The company procures PP pellets from leading suppliers such as BASF, Sinopec, Yangzi Chemical and other top-tier brands. These partners provide polypropylene homopolymers with precisely controlled melt-flow indices (MFI) – often around 12 g/10min – ideal for producing uniform tapes on high-speed lines. By vetting resin suppliers for ISO/ASTM certifications and stable quality, VidePak minimizes material variations. Strict incoming inspection checks (melt flow, density, contaminant levels) are applied to each batch of resin. This disciplined raw-material control means every woven fabric starts with polymers that meet global benchmarks for strength, purity and processability.
Partnering with major resin companies also allows VidePak to negotiate volume advantages and cost efficiencies. These long-term supplier agreements have enabled VidePak to reduce material costs while achieving tensile strengths exceeding 35 MPa in its woven fabrics. In short, VidePak’s raw material strategy – relying on virgin PP from renowned producers – underpins the high performance and consistency of its woven bag products.
State-of-the-Art Production Technology
At the heart of VidePak’s manufacturing is its investment in state-of-the-art equipment. All major machines on the PP bag production line are imported from world-leading suppliers. For example, VidePak’s tape extrusion and weaving stations are built by Starlinger, an Austrian firm known for precision engineered extruders and weaving looms. Starlinger lines allow VidePak to tightly control the film extrusion and tape stretching processes – in real time adjusting temperatures within ±1°C – to yield uniform oriented tapes with the desired strength and elongation properties. In addition to Starlinger, VidePak uses high-quality machines from Windmöller & Hölscher (W&H) and other top vendors for coating, printing and bag conversion.
This advanced machinery lineup means VidePak has a full set of production equipment for Polypropylene Woven Bags: twin-screw extruders for resin melting, tape drawing machines to orient the polymer, circular and flat looms to weave fabric, extruders/coaters for optional lamination or coatings, multi-color flexographic printers, automatic cutters and bag closers (sewing/taping/heat sealing), and robotic inspection and packaging systems. Every stage of the line is optimized for heavy-duty output. For example, Starlinger’s circular looms produce tubular PP fabric at high speed (upwards of 40–60 m/min), while integrated quality sensors monitor tape thickness and fabric tension. Together, these technologies enable VidePak to produce large volumes (hundreds of millions of bags per year) with consistently tight tolerances.
Advanced Manufacturing Process
VidePak’s Polypropylene Woven Bag production follows a precise, multi-step process. Each step is designed to maximize bag strength, moisture protection and automation compatibility. A typical manufacturing flow at VidePak includes the following stages:
- Resin Melting and Tape Extrusion: Virgin PP pellets are first dried and fed into twin-screw extruders. The molten polymer is extruded through slit dies to form flat tapes. These tapes are drawn at high speeds – often with a draw ratio of 5–7× – to orient the polymer molecules. Orientation increases the tape’s tensile strength and reduces creep (long-term stretch). VidePak’s Starlinger extruders maintain exact temperatures and speeds so that every tape in a run has uniform molecular orientation. The resulting tapes typically have deniers in the 600–1000D range, balancing strength with fabric weight.
- Fabric Weaving: The oriented tapes are immediately fed into weaving machines. VidePak uses both circular (tubular) looms and flat looms. Circular looms produce a seamless tube of fabric (ideal for open-mouth sacks), while flat looms produce wide rolls that are later cut and sealed (used for side-seam bags or specialized gussets). Woven mesh counts usually range from 8×8 to 12×12 (warp × weft), meaning 8 to 12 tapes per inch in each direction, depending on the bag’s capacity and application. VidePak’s automated looms weave continuously, producing fabrics with grammages from about 50 to 120 g/m². Weaving parameters (tension, density) are continuously monitored to avoid weak spots or flaws.
- Optional Coating or Lamination: For certain applications, VidePak applies surface treatments or laminates to the woven fabric. A thin polyethylene (PE) coating (typically 17–30 g/m²) can be extruded onto the fabric. This PP/PE layer enhances moisture resistance and creates a heat-sealable surface. Alternatively, VidePak can apply biaxially oriented polypropylene (BOPP) film laminates (10–21 µm thick) to the fabric via reverse printed lamination. BOPP lamination significantly improves print quality and surface gloss – ideal for consumer-facing packaging – while also adding a barrier layer. All coatings and laminations in VidePak’s line use polypropylene or polyethylene films compatible with the bag’s polymer, preserving recyclability and strength.
- Printing: The woven fabric (coated or uncoated) then proceeds to VidePak’s printing stations. Using multicolor flexographic presses (up to 8 colors) or gravure systems under BOPP lamination, VidePak can print custom graphics, brand logos, instructions and regulatory information directly on the bag. High-fidelity printing is especially important for fertilizer, grain and chemical bags where clear labeling and barcodes must survive harsh handling. VidePak also offers reverse printing beneath BOPP to protect artwork from abrasion. Pre-treatment (e.g. corona) ensures inks adhere well to the polymer surface. For food or delicate products, low-migration inks and food-grade coatings are used.
- Cutting and Gusseting: After printing, the continuous fabric is cut to length. VidePak uses both cold-knife and hot-knife cutters: a hot knife seals the cut edge to minimize fraying. For bags with gussets, sewing machines or hot air welders create folds in the fabric (increasing bag volume). VidePak offers flat open-mouth bags (side-seam), bottom-gusseted bags, M-gusseted bags, and fully tubular bags without side seams. Assembly also includes perforations or vent holes if required (for example, micro-perforations can allow grains or produce to “breathe” and avoid condensation).
- Forming & Mouth Closure: Each bag is then formed (flat-folded into an open-mouth sack) and prepared for closure. VidePak employs multiple closure systems, chosen by application:
- Fold-over stitching: The top of the bag is folded twice (~20–35 mm each fold) and sewn with heavy-duty polyester or cotton thread. This simple chain-stitch seam spreads stress and prevents fraying. It’s the most cost-effective closure, suited for granular or low-dust goods.
- Tape-over-sew: After folding, a woven PP or PE tape is adhered over the fold and then stitched through both layers. The tape blocks needle perforations, greatly reducing dust leakage from fine powders. VidePak’s machines can apply 50–70 mm wide tapes in-line before sewing.
- Hybrid Liner Seal + Sew: For hygroscopic or sensitive powders (like sugar or detergents), VidePak inserts a polyethylene liner inside the bag. The inner liner (50–90 µm thick LDPE/LLDPE film) is heat-sealed by hot bars or ultrasonic welding at the mouth, forming an airtight inner bag. Then the outer PP bag mouth is folded, tape-sealed, and sewn. This double-layer closure (airtight inside + rugged outside) prevents moisture and odor ingress while still allowing efficient filling.
- Block-Bottom (Hot-Air Welded): For heavy, high-speed products (cement, lime, industrial minerals), VidePak fabricates block-bottom valve sacks. Here, the bag’s bottom is formed by hot-air welding PP fabric layers, creating a brick-like structure that stands on its own. There are no stitch holes at the bottom, so dust retention is excellent. An integrated valve (14–18 cm long) is often welded into the inner seam for fast rotary packing. VidePak’s automated block-bottom line can produce valve sacks at high throughput, and the bags are designed to stack 3–4 meters high without bulging.
Each closure style is automatically processed on VidePak’s assembly lines, with throughput ranging from 15–40 m/min depending on the complexity (plain sewn lines are fastest, hybrids slower).
- Inspection, Counting & Palletizing: Throughout production, quality sensors and vision systems monitor critical parameters (seam accuracy, tape alignment, print registration). Every batch undergoes statistical inspection: seam strength is tested, welded joints are peel-tested, and liner seals are checked for integrity. Fully-formed bags are then run through automated counting machines and stacked on pallets for shipment. VidePak labels each pallet with batch numbers and inspection records, ensuring traceability.
In summary, VidePak’s manufacturing process is end-to-end: from PP resin to finished bag, every stage is controlled. The company’s ability to integrate extrusion, weaving, coating, printing and conversion equipment into one synchronized workflow enables exceptional consistency and scale.
Product Variety and Design Flexibility
VidePak offers a diverse product range of polypropylene woven packaging to meet different customer needs. Beyond standard open-mouth sacks, the company produces:
- Valve Bags: Top-sealing bags with an inner liner and external valve for gravity or piston filling. Suitable for cement, dry mortar, fertilizers and any flowable powders. VidePak can manufacture both cylindrical bags (tubular woven) and bag body plus gusset styles.
- Block-Bottom Bags (Self-standing): As mentioned, these have a brick-shaped bottom formed by heat welding. They provide excellent pallet stability and dust containment. Valve versions enable rotary packing speeds of thousands of bags per hour.
- Laminated BOPolypropylene Woven Bags: Polypropylene fabric laminated with printed BOPP film. These bags offer high-definition graphics and glossy finishes. They’re ideal for retail-oriented products where shelf appeal matters (premium grains, pet foods, specialty chemicals). The lamination also adds a moisture barrier.
- Coated/Uncoated Woven Bags: VidePak makes both uncoated (breathable) and coated (PE-coated) versions. Uncoated bags are used when ventilation is needed (rice, fertilizer with need to vent moisture). Coated bags (with 20–30 g/m² PE layer) are used when moisture resistance or heat sealability is required (sugar, salt).
- Inner-Lined Bags: For food-grade or highly hygroscopic products (flour, milk powder, food salt), VidePak can insert PE liners (usually 50–90 µm thick) into the woven bag. The liner can be either a separate film sleeve or an ultrasonically welded patch, depending on design. This barrier keeps contents dry and hygienic.
- Customized Sizes and Prints: VidePak’s capabilities allow any size from small 5 kg retail bags up to jumbo 50 kg bulk sacks. Through custom tooling, they offer flat, padded, or gusseted shapes (including M-gussets for uniform stacking). Customers can choose up to 8-color flexo prints with options like matte or glossy varnish. Furthermore, features like easy-open tear tapes, reinforced spouts, or even transparent windows can be integrated.
A few examples of VidePak’s common specifications include 25 kg and 50 kg formats. For instance, a 25 kg rice bag might be made of 70 g/m² uncoated PP fabric (10×10 mesh) with micro-perforations, printed in 6 colors, and closed with a 30 mm double-fold plus a 60 mm PP over-tape. A 50 kg cement bag might use 65 g/m² tubular PP fabric with a 20 g/m² coating, constructed as a welded block-bottom bag with a 15 cm valve. In all cases, materials and dimensions can be fine-tuned: fabric GSM (grammage) from 60–120 g/m²; closure width; valve length; coating weight – all are set per customer requirement.
Performance and Key Features
Polypropylene woven bags from VidePak are engineered for strength, durability and handling efficiency:
- High Strength-to-Weight Ratio: Thanks to oriented PP tapes, the bags deliver very high tensile and burst strengths relative to their weight. Typical fabrics from 60–90 g/m² can support the loads of 25–50 kg of product. VidePak’s fabric often exceeds 30–40 MPa tensile in one direction. This means the bags can be handled roughly on conveyors or forklifts without tearing.
- Tear and Puncture Resistance: The interlaced tape structure stops tears in their tracks. Even if a yarn breaks, the remaining network carries the load. VidePak’s sealing and heat-setting processes minimize abrasion points. The result is excellent resistance to punctures (from edges of pallets or bulging products).
- Dimensional Stability: Oriented PP tapes have low creep. VidePak’s heat-setting and annealing stages ensure that bags maintain their shape under load. Pallets of stacked bags remain square and stable, reducing “bag-sag” in storage.
- Moisture and Chemical Resistance: Polypropylene is inherently resistant to water and many chemicals. Uncoated Polypropylene Woven Bags will not degrade if splashed, and PP does not absorb moisture. For extra protection, VidePak’s coated bags form a near-impermeable barrier. PP’s inert nature also suits many fertilizers and industrial chemicals that might react with paper or other materials.
- UV Stability (optional): Outdoor storage can degrade unprotected PP fabric over time. VidePak adds UV stabilizers to the polymer when needed (programs of 200–1600 hours testing) to ensure bags remain ductile under sun exposure. This is crucial for long-term use in agriculture or construction storage yards.
- Customization for Handling: VidePak applies features to improve downstream use. Anti-slip embossing or coatings can be applied to bag surfaces to prevent pallet slipping. Tear-open tapes or perforated pull-tabs can be built in for consumer convenience. Gussets allow the bag to sit flat or expand without tipping. These thoughtful touches increase efficiency and reduce damage or spillage.
- Graphics and Labeling: High-quality flexo printing or BOPP-laminated graphics allow clear product and branding information. Bags can display batch numbers, logos, barcodes and usage instructions. UV varnishes or laminations protect the print from scuffing.
In essence, VidePak’s Polypropylene Woven Bags combine the core mechanical strengths of the woven PP fabric with application-specific enhancements (coatings, closures, prints) to meet each customer’s needs. They outperform many alternatives (like simple paper sacks) in ruggedness and versatility while remaining cost-effective.
Production Capacity and Scale
VidePak’s facilities are built for large-volume production. The company’s multiple production lines can churn out hundreds of millions of bags annually. In fact, VidePak boasts an annual capacity of 300 million polypropylene woven bags, ensuring it can meet even the largest bulk orders. (The combined capacity of all bag types, including FIBC and paper sacks, is even higher.)
Key points about VidePak’s production scale:
- Multiple Lines: The plant operates many parallel lines for tape extrusion, weaving and bag conversion. This means high uptime – if one line is in changeover, others continue. Combined with shift-based operation, VidePak can handle surges in demand.
- Automated Controls: Each machine is linked to a central monitoring system. If any segment slows or produces off-spec fabric, the line can auto-adjust speed or temporarily pause. This automation keeps efficiency high and scrap rates low.
- Raw Material Logistics: To sustain this throughput, VidePak maintains large silos and storage for PP resin. Just-in-time protocols ensure continuous feeding of extruders. Similarly, printed fabrics are moved via conveyors to converting lines, minimizing manual handling.
- Workforce and Expertise: With 500+ skilled staff, VidePak has dedicated teams in extrusion, weaving, bag-making, printing and quality control. Many operators have decades of experience. Their expertise ensures that even at 300M bags/year, quality never slips.
- Large-Scale Output: As a result, VidePak regularly fills ocean containers and railway cars for export orders. It has the capacity to support multinational clients, supplying thousands of tons of bags annually for cement plants, grain exporters, chemical warehouses and more.
In short, VidePak is not just a custom bag maker – it is an industrial-scale factory. Its large capacity allows economies of scale and reliable supply. Customers ordering tens of millions of bags annually can count on VidePak’s ability to deliver on time, every time.
Industry Applications: From Cement to Agriculture
VidePak’s polypropylene woven bags serve virtually every bulk packaging segment. Some of the major application areas include:
- Construction Materials: Cement, dry mortar, white cement, sand and other minerals. These products often require high-strength bags with low dust leakage. VidePak’s welded block-bottom or valve bags are ideal here, providing cube-efficient stacking and near-perfect seal. Cement bags from VidePak frequently incorporate a PE coating to handle moisture in storage.
- Fertilizers and Chemicals: NPK fertilizers, compound fertilizers, powdered chemicals (like salt or soda ash). These powders can be hygroscopic or corrosive. VidePak offers lined and coated bags to prevent moisture ingress. Strong stitched or taped seams keep fines from escaping. Custom printing can include safety warnings and analytics data for agrochemicals.
- Agricultural Products: Grains (wheat, rice, corn), seeds, feed, sugar, flour and more. Here the balance of strength and breathability matters. Uncoated woven bags with micro-perforations help ventilate rice and grains, avoiding condensation. Anti-slip treatments and gussets help in automated bagging lines. For example, a 25 kg rice bag will be lighter GSM, with a double-fold/tape seal for dust control.
- Animal Feed: Horse feed, dog food, birdseed etc. Often sold in retail packs (5–25 kg) but needing industrial ruggedness. VidePak’s custom-print laminated bags (with bright colors and clear product info) suit this market. The anti-slip texture keeps feed stacked securely in transport.
- Chemicals and Minerals: Pigments (TiO₂, CaCO₃), plastic resins, ceramics, foundry sand. Many of these materials are abrasive or dusty. VidePak’s PP fabric is resistant to chemical attack and abrasion. Customers often choose welded or tape-sealed closures to trap fine powders.
- Food Ingredients: Sugar, flour, milk powder, rice bran oil cakes. Food safety is paramount here. VidePak provides food-grade liners (FDA or EFSA approved polyethylenes) and clean manufacturing areas. The woven fabric itself is non-toxic PP. Tight sealing (double-fin welded liner plus taped mouth) ensures hygiene for export-grade foods.
- Environmental and Specialty: Water treatment chemicals, horticulture substrates, sandbags for flood control. For outdoor or specialty uses, VidePak can offer UV-resistant fabrics, waterproof liners, or heavier-duty grammages.
Across all these industries, VidePak’s bags are prized for consistent performance. For example, fertilizer producers report far fewer bag ruptures on conveyors when switching to VidePak’s 80 g/m² coated woven bags versus older fabrics. Grain traders appreciate the reduced infestations and spoilage due to the moisture barrier. Cement plants achieve faster filling and cleaner handling with VidePak’s valve sack designs.
Ultimately, any dry bulk good in the 5–50 kg range is a candidate for VidePak’s Polypropylene Woven Bags. By matching bag features to product needs, VidePak engineers help customers save money: fewer dust claims, less product waste, faster filling lines, and sturdier pallets.
Quality Assurance and International Standards
Quality is a core promise of VidePak. The company implements rigorous quality control at every stage:
- Standards Compliance: Production processes and testing adhere to international benchmarks. VidePak references ASTM standards (such as ASTM D5494 for bag mass, ASTM D6961 for seam strength, ASTM D6392 for burst strength) and ISO standards (like ISO 9001 quality management, ISO 22000 for food safety where applicable). Materials certificates (CoA) from resin suppliers are cross-checked with internal tests.
- In-Process Monitoring: During extrusion and weaving, VidePak continuously measures fabric GSM (using online sensors), tape tensile (via pull sensors) and dimensions. Any deviation triggers an alarm or immediate correction. This ensures uniform fabrics that exactly meet spec (e.g. 65 g/m² ± 2 g/m²).
- Mechanical Testing: Finished bag samples are routinely tested in the lab. Tests include:
- Tensile and Elongation: Grab tests to confirm the fabric meets the required strength (e.g. >300 N in warp/weft).
- Seam Strength: A stitched bag mouth is pulled until failure, ensuring seam strength typically above 50 kgf.
- Drop and Impact: Filled bags (weighing 50 kg) are dropped from ~1 meter height in multiple orientations to simulate handling. There should be no burst and minimal damage.
- Leakage/Vibration Test: Bags filled with fine powder are vibrated on conveyors to check for dust escape, especially on tape-sealed vs sewn closures.
- Burst Test: Hydraulic bursting tests gauge the bursting pressure of the bag (often >3–5 kPa depending on GSM).
- Abrasion and UV Ageing: For outdoor applications, sample bags undergo accelerated UV exposure (weeks to months) and flexing to simulate long-term use.
- Finished Product Inspection: Every lot of finished bags is subject to a 100% visual inspection or scanning. Barcode readers and cameras spot printing errors, mis-cuts or perforations. Operators count output and inspect for defects before palletizing.
- Traceability: Each production run is logged with resin batch, machine settings, operator and test data. This traceability means any issue can be traced to the source. VidePak maintains detailed records, aiding continuous improvement.
- Certification and Audits: VidePak holds certifications such as ISO 9001 (quality management) and may operate under standards like BRC (for food contact) upon request. Periodic internal audits and third-party audits ensure compliance.
Before shipment, VidePak’s Quality team double-checks that all products conform to agreed specifications. The goal is zero surprises: customers can expect that every bag shipped will pass performance tests and visual checks. This quality rigor has earned VidePak a reputation for reliability.
Why Choose VidePak Polypropylene Woven Bags
VidePak stands out as a supplier for several reasons:
- Top-Ranked Manufacturer: Being among China’s largest PP bag producers, VidePak combines scale with expertise. It has the capacity to handle both high-volume contracts and specialized orders.
- Full Virgin Material: By using only virgin PP (never recycled resin), VidePak ensures consistent quality batch-to-batch. Customers benefit from the highest mechanical properties and the lowest contamination risk.
- Advanced Equipment: As mentioned, use of Starlinger, W&H and other premium equipment means better precision and less downtime. VidePak’s investment in technology translates directly into more uniform, defect-free bags.
- Customization and Flexibility: VidePak’s experienced R&D team can tailor bag designs to unique needs. Whether you need a quick sample for testing or a long-term custom solution, they can adjust fiber weights, closures, prints and coatings.
- Competitive Pricing: Thanks to its scale and bulk material procurement, VidePak offers very competitive pricing. Lower failure rates and fewer claims mean a lower total cost of use for customers – the cheaper bag out the door often pays for itself by avoiding spillage and rework.
- Global Reach: VidePak exports to over 70 countries. It is familiar with international shipping regulations (e.g. IATA for air freight, UN M2 label for paper bags, etc.) and can manage logistics for large volume exports. Customers worldwide trust VidePak for on-time delivery.
- Sustainability Focus: Although Polypropylene Woven Bags are inherently durable, VidePak is mindful of the end-of-life. By keeping all layers polypropylene (PP fabric, PP tape, PP coating), many of their products are essentially mono-polymer and easier to recycle. This monomaterial approach aligns with global recycling streams. In addition, VidePak can use some recycled PP in non-food products if requested, blending sustainability with performance.
- Comprehensive Support: Beyond manufacturing, VidePak offers technical consulting. Their packaging engineers can advise on the best bag format, closure or coating for any product. They also help customers with field trials and feedback loops, ensuring the bag performs as expected in real supply chains.
Conclusion: Reliable Bulk Packaging Solutions
In summary, VidePak’s polypropylene woven bags are engineered solutions for modern bulk packaging challenges. By combining premium raw materials (from BASF, Sinopec, Yangzi, etc.), world-class production lines (Starlinger & W&H), and strict quality controls (ASTM/ISO compliance), VidePak delivers bags that consistently meet rigorous industrial requirements. The company’s vast product variety – open-mouth sacks, valve bags, laminated and coated fabrics – means virtually any granular or powdered product in construction, agriculture, chemicals or food can be safely packed.
With an annual capacity of 300 million bags, VidePak ensures even the largest orders can be supplied reliably. Each bag undergoes performance testing (seam strength, drop tests, leak checks) so that only defect-free products leave the factory. In practice, using VidePak’s Polypropylene Woven Bags translates into fewer dust claims, cleaner operations, and stronger pallets for customers.
VidePak is committed to continuous improvement and innovation in woven bag packaging. Its team of packaging engineers stays abreast of new materials (e.g. bio-additives), energy-efficient processes, and automation trends. But at the core, VidePak knows that quality and consistency win in the bulk packaging world. Whether your industry is cement, fertilizer, grain or beyond, VidePak’s polypropylene woven sacks are a proven choice. The company invites you to partner with them for robust, cost-effective, and trustworthy packaging solutions.
Contact details:
Email: Info@pp-wovenbags.com
Headquarters Address: No.57 Jinliang Rd, Pudong, Shanghai P.R.C 201323
Website: https://www.pp-wovenbags.com/
About Us:
Established in 2008, VidePak is dedicated to producing high-quality PP woven bags, BOPP woven bags, valve bags, kraft paper bags, HDPE FFS PE bags, and FIBC ton bags.
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