As the core material for reinforcement, anti-seepage, and isolation in geotechnical engineering, geogrid production line equipment configuration needs to closely match product types (plastic, steel plastic, fiberglass, polyester fiber), specification parameters, and production capacity requirements. The following is a systematic review of the rational selection logic from three aspects: requirement anchoring, core configuration by type, and general optimization principles.

1、 Anchor core requirements first: avoid blind configuration

Before selecting, three key points need to be clarified:

Product type: Is it a unidirectional/bidirectional plastic grille, steel plastic composite grille, fiberglass grille, or polyester grille? The core processes of different types vary greatly;

Specification parameters: width (such as 2-6m), tensile strength (such as ≥ 80kN/m), mesh size (such as 25 × 25mm), thickness (such as 1.5-4mm) - directly determine the accuracy and power of the equipment;

Capacity and site: daily output (such as 5-20 tons), factory length (production line usually 30-80m), environmental requirements (such as rust removal/waste gas treatment).

2、 Key points of core configuration by type

1. Plastic geogrid (unidirectional/bidirectional)

Core process: extrusion → flat film forming → stretching → shaping → winding

Extrusion system:

Screw selection: HDPE/PP raw materials are preferred to use twin-screw extruders (length to diameter ratio 25-30), which have good mixing uniformity and are suitable for adding fillers for modification; Capacity matching needs to be calculated: for example, the hourly output is 100kg, and the screw diameter can be selected from 65-90mm;

Mold head: A flat film mold head (with a thickness control of 1.5-3mm) is used for one-way grids, and subsequent longitudinal and transverse stretching is required for two-way grids. The accuracy of the mold head (such as ± 0.05mm) directly affects the uniformity of the product; Suggest choosing hard chrome plated mold heads, which are wear-resistant and durable.

Stretching device:

Unidirectional grille: longitudinal stretching machine (traction force ≥ 50kN), heating method selected as infrared+hot air combination (temperature uniformity ± 5 ℃), to avoid local overheating and fracture; Adjustable stretch ratio (3-8 times);

Bidirectional grille: Stretching vertically first and then horizontally (or vice versa), horizontal stretching requires a wide stretching machine (with a width of more than 6m), using chain type fixtures and synchronized tension control to prevent edge wrinkling.

Auxiliary system:

Cooling and shaping: a combination of water tank and air cooling to ensure stable product shape;

Winder: Automatic correction (photoelectric sensor)+tension control, suitable for winding 6m wide to avoid deviation.

2. Steel plastic geogrid

Core process: Steel wire pretreatment → Plastic composite extrusion → Cooling and shaping → Cutting

Steel wire system:

Wire laying rack: multi axis (such as 20-40 axis) tension control wire laying to avoid uneven tension of steel wire;

Pre treatment: Black steel wire requires mechanical rust removal machine (instead of acid washing, environmentally friendly), followed by coating with adhesive (such as epoxy resin) to enhance the adhesion between steel wire and plastic;

Composite extrusion:

Co extrusion die head: outer HDPE/PP, middle steel wire mesh; The mold head needs to accurately position the steel wire to prevent deviation;

Cooling: Segmented water cooling to ensure strong adhesion between plastic and steel wire (peel strength ≥ 30N/cm).

3. Fiberglass geogrid

Core process: Fiberglass yarn weaving → Resin coating → Curing → Cutting

Weaving system: warp knitting machine (brittle fiberglass yarn, stable warp knitting structure), selected high-speed warp knitting machine (speed ≥ 1000r/min), precise tension control (± 1N);

Coating curing:

Coating device: Modified asphalt/polyester resin coating, with controlled coating amount (e.g. 100-150g/㎡);

Curing oven: infrared heating (temperature 120-150 ℃), constant temperature zone length ≥ 5m, ensuring complete curing of resin;

Surface treatment: Embossing device (increases friction coefficient), optional film coating (anti-aging).

3、 General optimization principle: Improve efficiency and quality

Automation and online detection:

Automatic feeding system (reducing manual labor and avoiding raw material contamination);

Online thickness detector (laser/ultrasonic), tensile strength sampling device, real-time adjustment of process parameters;

Automatic cutting (fixed length/width), replacing manual labor and improving accuracy.

Environmental protection and energy consumption control:

Exhaust gas treatment: extrusion of VOCs using activated carbon adsorption+catalytic combustion (compliant emissions);

Energy saving motors: Variable frequency energy-saving motors are selected for extruders and stretching machines, reducing energy consumption by 15%;

Waste heat recovery: The waste heat from the stretching heating system is used to preheat the raw materials, reducing energy waste.

Flexibility and Scalability:

Equipment reserved interfaces: For example, the unidirectional grid production line can be upgraded with bidirectional stretching modules, and the steel plastic wire can be equipped with the function of adjusting the thickness of the steel wire coating layer;

Adjustable parameters: The stretching ratio, temperature, and speed all need to be digitally adjustable to adapt to the production of multi specification products.

After sales and maintenance:

Select manufacturers with mature cases and provide installation, debugging, and operator training;

Key components (such as mold heads and stretching fixtures) need to be easily replaceable, and spare parts (such as screws and heating tubes) should be supplied in a timely manner.

4、 Common Misconceptions to Avoid

Only focusing on price and neglecting accuracy: cheap molds can easily lead to uneven product thickness, with a defect rate of over 10%;

Lack of environmental protection configuration: production lines with acid pickling, rust removal, and no waste gas treatment face the risk of shutdown and rectification in the later stage;

Neglecting site adaptation: For example, a 6m wide production line requires a factory length of ≥ 50m and a width of ≥ 8m, and the layout should be planned in advance.

The configuration of the geogrid production line needs to be customized according to demand: first clarify the product and production capacity, and then focus on the core process components (mold head, stretching machine, tension control), taking into account automation, environmental protection, and scalability. Reasonable configuration can not only reduce production costs, but also ensure stable product quality and enhance market competitiveness.