Shreeji Engineering

Artificial Grass Monofilament Extrusion Line

A monofilament extrusion line melts polymer pellets (PP / HDPE / LLDPE), extrudes them through a spinneret to form strands, cools the strands, stretches or draws them to orient polymer chains (raising tensile strength), optionally textures or crimps the filaments, and finally winds them onto spools for tufting into artificial turf.
Core purpose: to produce uniform, high-tensile synthetic grass yarn in the required denier, shape, and color.

Typical Line Components

• Raw material feeding / dosing system — hopper with gravimetric or volumetric feeders for color and additive dosing.

• Extruder(s) — single or twin-screw extruder with screw diameters commonly 45–90 mm and L/D ratio of 28–35:1; equipped with multiple heating zones and temperature control.

• Melt pump / static mixer — stabilizes melt pressure and ensures color uniformity before entering the die.

• Die head / spinneret — shapes the filament (round, U-profile, C-profile, etc.); number of holes and die design determine the final yarn profile.

• Cooling system — water quench tanks or air cooling units to solidify the extruded filaments.

• Stretching / drawing units — multi-roller draw systems (typically 7 or more rollers) and hot-air ovens for molecular orientation and crystallization; draw ratios depend on polymer and desired filament properties.

• Texturing / crimping unit (optional) — air-texturing or mechanical crimping for softer, more natural-looking filaments.

• Winding / take-up system — multiple spindle winders or bobbin winders (e.g., 24 spindles) for collecting yarn, controlled via PLC and HMI interface.

Common Polymers and Their Use

• LLDPE / HDPE — preferred materials for artificial turf due to excellent weather resistance, UV stability, and softness. HDPE provides superior durability and wear resistance.

• PP (Polypropylene) — cost-effective option with good processability, though lower in UV and abrasion resistance compared to HDPE or LLDPE.