Discover China Gwell's premium intelligent extrusion machinery solutions engineered for high performance, thermal stability, and strict quality control across global industrial domains.
Subway and transit infrastructure developments operate in highly taxing environments. Rapid urbanization requires deep underground excavations that face sustained hydrostatic pressures, dynamic tectonic shifts, and acidic or alkaline groundwater tables. In modern civil construction, the integrity of the concrete lining depends heavily on the barrier performance of the waterproofing membrane. Traditional PVC and HDPE sheets often struggle with long-term flexibility, cracking under cold cycles, or suffering damage during concrete pours.
Ethylene-Vinyl Acetate (EVA) copolymer waterproofing membranes have emerged as the industry gold standard. Because of their unique chemical structures combining flexible ethylene monomer chains with polar vinyl acetate groups, EVA sheets provide exceptional elongation properties, superior self-healing capabilities, and reliable thermal welding integrity. This ensures that the subway tunnel's structural lining remains completely isolated from water ingress throughout a multi-decade operational lifespan.
“Subway tunnel linings are built to last over a century. The extrusion process of EVA sheets must ensure uniform crystallization, zero micro-voiding, and high thickness precision to maintain constant structural integrity under pressure.”
To satisfy these demands, China Gwell has engineered a turnkey EVA waterproofing sheet extrusion line that incorporates advanced gravimetric feeding, a highly homogeneous screw geometry, an automatic T-Die system, and a precision calendar cooling setup. By optimizing the raw polymer blend in-line, manufacturers can produce multi-layered geotextile-bonded composites that dramatically reduce installation times on-site.
A high-quality EVA waterproof sheet is not just a result of quality raw materials; it is directly shaped by the thermal and mechanical characteristics of the extrusion line. China Gwell's system features a series of proprietary design updates engineered to maximize polymer properties:
EVA is highly sensitive to thermal degradation and shear-induced discoloration. Gwell utilizes a custom single or co-rotating twin-screw extruder with a high L/D ratio of 33:1 or 35:1. The screw profile features custom mixing elements designed to homogenize the melt at lower temperatures, preventing vinyl acetate group breakdown.
Equipped with internal deckling systems, Gwell's T-die provides precise control over multi-layer configurations (such as EVA core layer + signal backing layer). Real-time automatic thermal bolt adjustments control thickness variances to under ±1%, ensuring compliance with international civil engineering tolerances.
This specialized module bonds a non-woven geotextile to the hot extruded EVA sheet directly. By combining these steps, the machine eliminates the need for secondary adhesive processes, creating a composite material that functions as both a drainage layer and a waterproof barrier.
The global waterproofing market is undergoing a rapid transition. Driven by massive investments in public transit networks, underground expressways, and high-speed railway tunnels, the demand for resilient waterproofing membranes is growing at an annual rate of over 6.5%. Regions like East Asia, Western Europe, and North America have updated their national building codes to mandate higher physical specifications for materials used in underground systems.
For example, the European Standard EN 13491 and the American ASTM D5385 specify stringent test protocols for water resistance and elongation under high hydrostatic loads. Extruding membranes that meet these criteria consistently requires highly accurate machinery control loops, which has increased pressure on manufacturers to upgrade older calender lines to automated co-extrusion setups.
Moreover, sustainability is a key focus in modern construction. Key project owners are increasingly selecting manufacturing partners that utilize low-emission extrusion setups. China Gwell's EVA waterproof sheet extrusion lines feature integrated energy-saving heating modules and closed-loop water cooling systems. These systems consume up to 20% less energy per ton than traditional models, aligning with global green building standards.
Modern transit systems rely heavily on robust underground networks. High-quality waterproof membranes are essential to prevent structural damage and extend the lifespan of these multi-billion-dollar investments.
Different environments require custom approaches to waterproofing. Gwell's extrusion technology allows producers to customize sheet properties for specific physical conditions:
These tunnels must endure extreme hydrostatic pressure and chemical wear from salt water. Our extrusion lines produce specialized multi-layered EVA/ECB (Ethylene Copolymer Bitumen) sheets. These membranes prevent salt ions from degrading the lining, protecting the reinforcing steel from premature corrosion.
In regions prone to earthquakes, tunnel linings experience frequent shear movements. Standard membranes can shear and tear under these forces. An EVA membrane produced with Gwell's low-temperature extrusion process retains its elasticity up to 700% elongation, allowing the sheet to stretch and deform without losing its waterproofing seal.
Deep metro stations located in humid, subtropical climates often experience internal temperatures exceeding 40°C. Waterproofing sheets must resist microbial attacks and physical sagging. By adjusting the copolymer vinyl acetate percentage and integrating specialized UV-thermal stabilizers in Gwell's multi-component gravimetric dosing unit, the sheet maintains its structural stability over time.
Explore Gwell's diversified production capabilities. We design and deliver precision extrusion systems categorized below into Cast Film, Board Extrusion, Sheet Extrusion, and Solar Encapsulation lines.
GWELL Machinery Co., Ltd., a leading manufacturer of plastic extrusion lines, proudly presents its ASA film solutions.
TPU Laminating Film is a thin film material made from thermoplastic polyurethane, optimized for durable bonding.
The TPU films produced on GWELL's TPU Film Extrusion Line are versatile and suitable for a wide range of industrial packaging and automotive protection designs.
PVDF solar backplane membrane: PVDF membrane serves as an alternative to Tedlar for solar panel backing and protection.
GWELL's PVB Wedge Film Extrusion Line represents a significant advancement in the manufacturing of safety glass interlayer webs.
The PVB interlayer film extrusion line integrates advanced cooling systems with robust mechanical frames for auto and structural glass.
GWELL's PVA Water Soluble Film Extrusion Line is a specialized manufacturing setup tailored for packaging and eco-friendly films.
Polyimide (PI) is one of the highest-performing organic polymer materials, widely used in aviation, aerospace, and electronics.
CHINA GWELL, a leading innovator in plastic extrusion technology, proudly presents its state-of-the-art PEVA cast film lines.
GWELL Machinery, renowned for its expertise in extrusion technology, presents the high-yield PETG decorative film system.
GWELL's WPC and SPC Extrusion Line represents a cutting-edge technological advancement in the production of interior and exterior flooring.
High Production Efficiency: With automated controls and optimized process parameters, the line guarantees consistent quality.
Specialized equipment for engineering plastics processing, providing superior chemical and temperature resistance.
GWELL's PE HDPE Board Extrusion Line is a state-of-the-art production line dedicated to manufacturing heavy-duty sheets.
GWELL's PC PMMA Board Extrusion Line is a sophisticated manufacturing system engineered to produce optical-grade clear panels.
GWELL's GPPS Diffuser Plate Machine is an advanced and efficient equipment designed for optical and lighting applications.
High thermal conductivity composite sheets, designed for industrial sealing and heat-sink applications.
Specialized production line designed to manufacture interior refrigerator inner containers with high draw ratio capabilities.
A versatile co-extrusion setup designed to process multiple thermoplastic polymers with rapid material changes.
PCT/PCTG sheet is a high-performance transparent copolyester material that combines rigidity with excellent impact resistance.
TPO and TPE Sheets are innovative materials with rubber-like flexibility, processed with low thermal stress.
GWELL Machinery Co., Ltd. presents its high-precision rigid PVC sheet line, perfect for industrial barriers and packaging.
GWELL's PP Two-Tone Sheet Extrusion Line is a state-of-the-art manufacturing system designed for customized color profiles.
The PP PS Sheet Extrusion Line utilizes advanced flat-die technology to produce packaging-grade blister sheets.
PLA Degradable Sheet (Polylactic Acid) represents a biodegradable alternative for eco-friendly consumer packaging.
GWELL, a leader in plastics extrusion equipment, proudly presents its high-purity multi-layer PET barrier sheet lines.
Specially designed for low-temperature thermoplastic splint materials, satisfying rigorous medical certifications.
The PC PMMA Optic Sheet Extrusion Line represents a cutting-edge manufacturing solution for optical light guides and screens.
Equipped with precision die designs and advanced temperature control to ensure structural safety compliance.
GWELL is proud to present its state-of-the-art SGP Solar Film Extrusion Line, designed for structural safety laminates.
A premier solution for solar cell encapsulation, offering excellent UV aging resistance and high light transmission properties.
Equipped with precision dosing systems and automated profiles to ensure consistent mechanical dimensions.
GWELL's PPS (Polyphenylene Sulfide) separator extrusion line is optimized for clean-energy hydrogen fuel cell setups.
GWELL's EVA/POE Solar Film Extrusion Line is a cutting-edge manufacturing solution tailored for photovoltaic encapsulation.
Core features include high-efficiency output, uniform tension winding control, and precise temperature monitoring.
A state-of-the-art manufacturing line dedicated to producing co-extruded solar encapsulation films.
Designed for the high-precision production of safety PVB films used in building-integrated photovoltaics (BIPV).
Industrial requirements for waterproofing are changing rapidly, shifting toward smart manufacturing and active quality validation. To support these developments, China Gwell's engineering department has focused its research and development on several key areas:
Future extrusion setups will integrate smart thickness scanning technology. When the system detects a variance across the sheet, it automatically triggers thermal bolts inside the die head to adjust the opening. This real-time alignment maintains constant thickness profile control with minimal human intervention.
With regulatory focus shifting toward circular materials, Gwell's upcoming screw configurations are designed to process up to 30% recycled ocean-bound plastics and bio-derived EVA resins. Advanced venting ports exhaust volatiles effectively, maintaining structural properties without sacrificing environmental metrics.
To help field inspectors detect tunnel leaks quickly, Gwell is developing dual-color co-extrusion technology. The finished sheet features a thin, bright yellow warning layer over a black base. Any physical abrasion or puncture during backfilling exposes the dark core, allowing installation teams to identify and repair damaged areas before concrete pouring begins.
Gwell ensures all manufactured systems comply with regional mechanical and electrical standards, including the European CE mark, UL directives for North America, and EAC certifications for the Eurasian Customs Union. Each extrusion line undergoes rigorous factory testing before shipment, including simulating high-load operations, to verify thermal stability and safety performance.
Understanding that unexpected downtime on an extrusion line can disrupt project schedules, China Gwell maintains a global network of service engineers. We provide remote system monitoring, preventative maintenance schedules, and rapid on-site support. Our regional warehouses keep critical parts in stock, helping you minimize production interruptions.
China GWELL Machinery is a high-tech enterprise dedicated to the manufacture of plastic extrusion lines for Film, Sheet and Profile. Relying on the powerful technology and equipment of the group and an innovative spirit, GWELL commits to the development of high-tech products and the international market.
“Expertise creates customers' values” has always been the company's operating philosophy, driving continuous technological refinement and global supply chain partnerships.
With multiple domestic production bases, Gwell combines advanced manufacturing capabilities with rigorous testing. We maintain an engineering team of over 100 specialists focused on optimizing extrusion screw geometries, thermal flow stability, and automated control systems.
Our global market presence is supported by competitive logistics, continuous research collaborations, and reliable technical service capabilities.
We collaborate closely with leading universities and materials research institutes to design and build high-tech machinery.
We provide end-to-end support, covering initial project layout design, installation, calibration, and local training.
Our three manufacturing hubs provide a stable annual production capacity of over 1,000 highly integrated extrusion lines.
Gwell products are exported worldwide, supporting construction and packaging projects in over 80 countries.
Our workforce of 500 includes over 100 mechanical and electrical engineers specialized in industrial machinery design.
Read our detailed Q&A to learn more about the engineering behind EVA waterproofing sheets and our extrusion system capabilities.
China Gwell products meet international manufacturing standards. Contact our team to request copies of our compliance and quality certifications.
Gwell will display its latest high-precision extrusion technologies at upcoming international plastics and rubber trade shows.
Gwell launches a new eco-friendly POE synthetic leather extrusion line, catering to automotive interiors and fashion industries.
Gwell's PVB wedge-shaped film production line offers high precision, high efficiency, and high compatibility for safety glass manufacturers.
Consult with China Gwell's engineering team to customize an extrusion line configured for your specific throughput, thickness, and material requirements.
Send Technical InquiryExplore more of Gwell's technical extrusion lines designed for solar encapsulation, green packaging, and specialized engineering plastics.
