Cement woven bag production equipment: technical points and production process analysis

In the building materials packaging industry, cement woven bags, as an economical and practical packaging method, are widely used for packaging powdery and granular materials such as cement, fertilizers, and building materials. Their production quality and efficiency are directly dependent on the technical level and stability of cement woven bag production equipment. This article will delve into the core components, technical features, and production processes of cement woven bag production equipment, providing professional reference for relevant industry professionals.

1. The core components of cement woven bag production equipment

Cement woven bag production equipment is an automated production line that integrates multiple processes such as wire drawing, weaving, coating, printing, cutting and sewing. It mainly consists of the following parts:

1. Wire drawing units : Wire drawing is a fundamental step in woven bag production, and its quality directly determines the strength and durability of the bag. Wire drawing units melt-extrude polypropylene (PP) or polyethylene (PE) pellets, then stretch and shape them into flat yarns. Modern wire drawing units are typically equipped with a high-efficiency extruder, precision die head, cooling water tank, traction device, and winding system to ensure uniform flat yarn density and high tensile strength.
2. Circular looms : Circular looms are the core equipment for woven bag production. They weave flat yarns into tubular fabrics through warp and weft interweaving. Depending on the loom structure, they can be divided into four-shuttle and six-shuttle circular looms. High-performance circular looms feature high speeds, low failure rates, and controllable weaving density, making them suitable for producing woven fabrics of varying weights and widths.
3. Coating unit : To enhance the moisture-proof and leak-proof properties of woven bags and enhance their printability, the woven fabric is typically coated. The coating unit uses hot-melt technology to evenly laminate polyethylene film onto the surface of the woven fabric. Critical control points include coating temperature, pressure, and speed.
4. Printing presses : Woven bags require printing of company logos, product information, and other content. These are typically printed on flexographic or gravure printing presses. Modern printing presses are often equipped with automatic color registration systems, drying units, and exhaust gas treatment equipment to ensure clear printing and environmental compliance.
5. Cutting and bottom sewing machine : The coated and printed tubular fabric is cut to the desired length and the bottom of the bag is sewn together using a bottom sewing machine. This process requires high cutting precision and strong stitching to prevent unraveling or bag breakage during use.

2. Technical Characteristics and Innovation Trends

With the deepening of intelligent manufacturing and green production concepts, cement woven bag production equipment continues to optimize in technology and process, mainly reflected in the following aspects:

• Automation and Intelligence : Modern equipment generally utilizes PLC control systems, human-machine interfaces (HMIs), and sensor technology to automate the entire process, from material input to finished product. Intelligent systems monitor equipment operating status in real time, automatically adjust process parameters, and provide fault diagnosis and early warning capabilities, significantly improving production efficiency and product consistency.
• Energy-saving and environmentally friendly design : The new wire drawing unit adopts high-efficiency energy-saving motors and heat recovery systems to reduce energy consumption; the coating and printing processes use water-based inks, solvent-free composite technologies and other technologies to reduce VOCs emissions, complying with environmental protection policy requirements.
• Modularity and flexibility : To meet the market demand for multiple varieties and small batches, equipment design tends to be modular, which can quickly switch production specifications (such as bag width, weight, color, etc.) to reduce downtime.
• Enhanced material adaptability : The equipment can process recycled plastic particles or bio-based materials, supporting the sustainable development of the industry.

3. Overview of production process

The typical production process of cement woven bags includes:

1. Raw material preparation : Mix polypropylene granules with color masterbatch, filling masterbatch, etc. in proportion, and send them into the extruder after drying.
2. Wire drawing : The material is melt-extruded, cooled, drawn, heat-set and then rolled into a flat yarn spindle.
3. Weaving : The flat yarn is woven into tubular fabric using a circular loom, and the weaving density and defects are detected in real time.
4. Coating and printing : The tubular cloth is laminated with a film through a coating unit, and then printed and dried.
5. Cutting and bottom sewing : Cut the tube cloth according to the set size and complete the bag making through the bottom sewing machine.
6. Inspection and packaging : The finished bags are inspected for strength, sealing and printing quality, and are packaged and stored after passing the inspection.

4. Equipment selection and maintenance recommendations

When selecting cement woven bag production equipment, consider factors such as production scale, product type, budget, and after-sales support. It's recommended to prioritize equipment with mature technology and high stability, and pay attention to the manufacturer's technical service capabilities. Routine maintenance should include regular cleaning of the die, lubrication of moving parts, and sensor calibration to extend equipment life and ensure product quality.

Technological advances in cement woven bag production equipment have not only driven greater efficiency and greenness in the packaging industry, but have also reduced packaging costs for cement companies and enhanced their product image. In the future, with the continuous emergence of new materials and processes, this field will continue to undergo iterative upgrades. For manufacturers, keeping up with technological trends and optimizing equipment configuration will be key to improving their competitiveness.

Through the above analysis, we hope to provide practical reference for industry practitioners and help achieve high-quality production goals.