Operational Skills for Geogrid Production Line

When operating a geogrid production line, mastering practical skills is the core to guarantee product quality and boost production efficiency. Controls shall be implemented from four dimensions: pre-start preparation, in-process control, fault handling and equipment maintenance. The specific skills are listed below:

I. Before Startup: Basic Skills for Accurate Commissioning

Common raw materials for geogrids are polypropylene (PP) or high-density polyethylene (HDPE). Raw material pretreatment must be completed before startup: select proper grades according to product performance requirements. For instance, high melt-index PP for high reinforcement strength; UV stabilizer masterbatch for superior anti-aging performance. Raw materials shall be stored in dry environments to avoid uneven plasticization caused by moisture absorption.

Pre-setting equipment parameters is critical. The extruder barrel adopts sectional temperature control: 190℃–240℃ for PP and 170℃–220℃ for HDPE to prevent material degradation from local overheating. Use feeler gauges to calibrate hole spacing and gaps of stretching dies, ensuring mesh size deviation ≤±1 mm after stretching. For uniaxial geogrids, set pre-tension of 5%–10%, and adjust the tension of stretching machine chains with fluctuation no more than 0.5 cm. Meanwhile, test-run the cooling system to ensure air and water cooling rapidly remove heat from stretched geogrids and prevent subsequent deformation.

II. During Production: Operating Skills for Core Processes

Plasticization monitoring is the foundation of production. Check whether melt flowing out of the extrusion die is uniform and bubble-free. Silvery bubbles usually result from moist raw materials or insufficient plasticization. Appropriately raise barrel temperature or extend plasticization time.

Stretching technology determines geogrid mechanical performance. Uniaxial geogrids adopt longitudinal stretching with stretch ratio of 6–9 times and speed of 10–15 m/min. Synchronously adjust traction force to avoid geogrid breakage caused by excessive local tension. For biaxial geogrids, perform longitudinal stretching (4–7 times) first, followed by transverse stretching (3–6 times). Match tension in both directions to prevent mesh skewing. Cooling and shaping shall be finished within 0.5s after stretching, cooling geogrids below 40℃ to lock molecular orientation and improve yield strength and tensile resistance.

III. In Case of Abnormalities: Quick Troubleshooting Skills

Targeted solutions are required for frequent production faults:

① Unqualified tensile strength: Check raw material melt flow rate (controlled at 0.5–2 g/10min), sufficient stretch ratio, or material degradation induced by excessive temperature.

② Hole offset or mesh deformation: Regularly polish worn dies and adjust gaps of stretching tension rollers for uniform tension.

③ Surface irregular marks: Stop the machine and recalibrate die gaps, ensuring gap error ≤0.02 mm at all positions. Operators shall record parameters of each batch for traceable adjustment and reduce waste caused by abnormalities.

IV. Maintenance & Safety: Safeguards for Long-Term Stable Operation

After daily production, flush the extruder barrel with raw materials of the same grade to remove residual degraded materials and avoid impurities in next shift. Inspect stretching machine guide rails and chains weekly and fill with high-temperature resistant lubricant. Calibrate tension sensors monthly to guarantee parameter accuracy.

For safety: Do not wear gloves or loose clothing during operation to prevent entanglement in rotating components. Keep raw material storage areas away from fire sources and equip dry powder fire extinguishers. New operators must receive 3-day hands-on training before independent operation and know the location of emergency stop buttons.

In summary, operational skills for geogrid production lines combine theory and practice. Operators need to manage parameter control, quality abnormality disposal and equipment maintenance to realize stable line operation and consistent qualified products.