PVC geomembrane
1. Superior impermeability: PVC geomembranes effectively block water penetration with an extremely low coefficient of permeability, making them suitable for anti-seepage projects such as canals and landfill sites.
2. Good chemical corrosion resistance: Exhibits excellent resistance to acids, alkalis, salts, and other chemical substances, making it suitable for aggressive environments such as chemical industrial parks and wastewater treatment plants.
PVC geomembrane is a high molecular flexible waterproof material primarily made from polyvinyl chloride (PVC) resin, manufactured through calendering or extrusion processes. It is widely used in various civil, hydraulic, and environmental engineering projects, and has become one of the key materials in modern impermeability engineering due to its excellent anti-seepage performance and adaptability to construction conditions.
I. Core Characteristics of PVC Geomembrane
1. Outstanding Anti-Seepage Performance
The permeability coefficient of PVC geomembrane is extremely low, typically ranging between 10⁻¹¹ and 10⁻¹² cm/s, far lower than that of clay and concrete. It effectively blocks the infiltration of water, leachate, and other liquids, making it an ideal impermeable barrier.
2. Excellent Chemical Resistance
PVC geomembrane exhibits strong resistance to chemical substances such as acids, alkalis, and salts, making it suitable for use in corrosive environments like chemical plants, sewage treatment tanks, and landfills.
3. Superior Flexibility and Deformation Adaptability
The material is soft and highly extensible, capable of accommodating uneven foundation settlement or structural deformation without cracking. It is particularly suitable for complex terrains and dynamic loading conditions.
4. Convenient Installation and Reliable Joints
PVC geomembrane can be joined using methods such as hot-air welding, solvent bonding, or mechanical fastening. The resulting seams are strong, the construction process is fast, and the requirements for on-site conditions are relatively low.
5. High Cost-Effectiveness
Compared to EVA or HDPE membranes, PVC has lower raw material costs and a mature processing technology, offering greater advantages in overall project cost and making it ideal for large-scale applications.
6. Environmental Friendliness and Durability
PVC geomembranes produced with eco-friendly formulations are non-toxic and harmless, with some products being recyclable. Under normal conditions, their service life can exceed 15 years.
II. Plasticization and Calendering (Mainstream Process)
This is the core stage in the production of PVC geomembranes, with a typical process flow as follows:
1. Feeding and Plasticization
The blended dry powder is fed via a conveying system into an open mill or internal mixer, where it is melted and plasticized under heat and shear force, forming a viscoelastic melt.
2. Filtration and Homogenization
The melt passes through a filtration extruder to remove impurities (such as undispersed particles, "fish eyes", etc.), ensuring material purity.
3. Calendering
The melt is fed into a four-roll or three-roll calender, where it is pressed into a continuous sheet film through the nip between heated rolls under high temperature and pressure. Roll temperatures are controlled in zones (typically 160–190 °C) to ensure complete plasticization without scorching.
4. Traction and Cooling
The film is drawn off by take-off rolls and cooled and shaped through a series of cooling rolls to prevent thermal deformation. Cooling is typically achieved by a combination of roll cooling and air cooling.
5. Surface Treatment and Winding
Optional embossing treatment can be applied to increase surface friction, suitable for sloped engineering applications;
After passing through an automatic length-measuring device, the film is wound by a winder into large finished rolls, with typical widths of 4–8 meters and lengths up to 50–100 meters.
III. Main Application Areas
1. Environmental Protection Engineering
·Landfills: Used as impermeable liners and final cover systems to prevent leachate from contaminating soil and groundwater.
·Hazardous Waste Disposal Sites: Employed to isolate toxic and hazardous substances, ensuring the safety of surrounding ecological environments.
·Wastewater Treatment Facilities: Applied in oxidation ponds, equalization tanks, and sedimentation basins to prevent sewage leakage.
2. Hydraulic and Water Resource Management
·Reservoirs and Artificial Lakes: Laid on the bottom or slopes to reduce water loss and improve water storage efficiency.
·Irrigation Canals and Waterways: Used as a lining impermeable layer to significantly reduce seepage losses during water conveyance.
·Dams and Cofferdams: Enhance anti-seepage capacity and improve the flood resistance safety of engineering structures.
3. Municipal and Building Engineering
·Underground Structures: Used for waterproofing and moisture protection in subway tunnels, underground utility tunnels, and the roof slabs of underground parking garages.
·Roof Gardens and Landscape Water Bodies: Provide lightweight waterproofing solutions that support the development of urban vertical greening.
4. Agriculture and Aquaculture
·Water Storage Tanks and Irrigation Systems: Prevent seepage of agricultural water, improving water use efficiency.
·Aquaculture Ponds: Construct standardized fish or shrimp farming ponds to maintain clean water quality and prevent cross-contamination by pathogens.
5. Industrial and New Energy Engineering
·Photovoltaic Power Stations: Used for impermeable treatment of component foundations or site drainage systems.
·Salt Pan Crystallization Ponds: Prevent brine leakage and enhance salt production efficiency.
·Petrochemical Tank Farms: Serve as impermeable isolation layers to prevent leakage risks.
Shandong Yuanpeng Environmental Protection Technology Co., Ltd. was founded in 2022 with a registered capital ofRMB 50 milion. The company employs over 300 people, and its production facility covers 35,000 square metersEquipped with a professional technical and R&D team, the company is a comprehensive company integratingproduction, sales, and after-sales service.
Some production lines have reached full automation. Annual sales volume reached 120 million yuan. The company has established long-term partnerships with organizations such as CREC, CSCES, CCCC, MCC Group, POWERCHINA, Tongyuan Design Group, CSMDI, BMEDI, and others.
