Geomembrane Production Line

Geomembrane in addition to raw materials and specifications there are many different, the production method is also divided into two kinds, namely, blown film and film, corresponding to the process for the blow moulding process and extrusion process. The geomembrane produced by the two production processes have certain differences, but also have their own advantages, the following we will analyse the advantages and disadvantages of the two production processes.

I. Cast film

Laminating film, also known as cast film, is a non-stretching, non-directional flat extruded film produced by melt cast quenching, single-layer cast and multilayer co-extruded cast in two ways. Its production process is like this: first of all, the ingredients, will be high-density polyethylene particles, colour masterbatch, carbon black and other raw materials after a certain proportion of proportioning, mixing evenly into the silo, and then by extruding the raw materials through the extrusion machine temperature melting into a fluid, by the screw extrusion in the film lip extrusion by traction through the steel rod or rubber roll forming cooling, which the size of the gap between the rollers is the thickness of the geomembrane, and finally hauling the cutting edge of the rolls.

The advantages of the film is high production efficiency, different thicknesses can be adjusted at will, low cost, high gloss geomembrane finished product, good flexibility, the minimum thickness can be done 0.2mm, the disadvantage is that the thickness is not uniform.

II. Blown film

Blown film production process is a three-layer co-extruded blow molding production method, the production process is the raw material through the three heating screw feed into the blow molding machine die head, heated and melted into a melt inside, these melts are extruded under the action of the pressure of the head, and in the position of the head to form a cylindrical, compressed air by the die head upward blowing up the formation of a certain diameter of the film bubble, by the traction rollers upward stretching and cooling to form a geomembrane, in the downward stretch after the curl, traction division by the spreading of the membrane. The geomembrane is then stretched and cooled downwards by the traction rollers to form the geomembrane, then extended downwards by curling, and then split into rolls by traction.

The advantage of blow moulding process is that the thickness of geomembrane is uniform, the tensile strength is high and the quality of the membrane is stable, the disadvantage is that the production cost is high, the price is not advantageous, the gloss and elongation are not as good as that of the laminating membrane.

In the case of using the same raw materials, the geomembrane produced by the two processes have their own advantages and disadvantages. Because of the low cost, good flexibility, tunnel engineering and civil engineering use more, while the blow moulding process because of the uniform thickness of the product, quality stability is higher, more suitable for landfills, reservoirs, tank farms, seepage control and other quality requirements of the project. But no matter which process, as long as in accordance with the standard production, the quality is up to standard, we go in accordance with the needs of the project to choose the appropriate can.

Nanjing Suminoe Precision Machinery Co., Ltd. has professional cast film production line, the company's main cast film manufacturing production line: TPU hot melt adhesive film production line, CPP/CPE cast film production line, EVA solar energy encapsulation adhesive film production line, PE sanitary breathable film production line, PVDF cast film production line, PP 3D film production line, medical blood purification film production line, multilayer co-extruded barrier film production line, LLDPE winding film production line production line, LLDPE winding film production line and so on.