Industry-leading high-performance sheet and cast film extrusion machinery configured for premium manufacturing outputs.
High-efficiency custom PP extrusion lines delivering optimal thermal forming properties for diverse commercial packaging and industrial forming applications.
Specialized processing equipment designed to handle high-temperature engineering fluoroplastics, ensuring maximum film durability and chemical resilience.
Pioneering functional solar and encapsulation films using advanced multi-layer co-extrusion technology for superior physical performance metrics.
State-of-the-art co-extrusion system offering high optical clarity and uniform structural integrity across complex three-layer compositions.
Highly robust production setups configured to process heavy composite wood-plastic and stone-plastic building boards with continuous stability.
Mass-production manufacturing systems focused on clean, high-speed thermal molding sheets for food contact packaging.
Extreme precision film extrusion line producing highly regulated interlayers for smart automotive windshield solutions.
Innovative manufacturing plant optimized for processing new energy PPS diaphragms with high thermal and chemical parameters.
In modern civil engineering, underground structures such as high-speed railway tunnels, subway corridors, and highway tubes are designed for a service lifespan exceeding 100 years. Preventing water ingress is paramount to structural longevity. Ethylene-Vinyl Acetate (EVA) and Polyethylene (PE) geomembranes are preferred over PVC due to superior elastomeric behavior at low temperatures, high chemical resistance, and ease of thermal welding. Designing extrusion machinery for these high-grade waterproofing sheets requires precision thermal management, high shear rates, and advanced roll calendering.
Global infrastructure investments demand thicker, wider, and multilayered waterproofing sheets. Modern specifications require composite structures, typically incorporating a signal layer (a thin, brightly colored top sheet) to visually highlight physical damage during rock-bolt installation. EVA extrusion equipment is evolving towards wider configurations (up to 4.2 meters) to minimize seam-welding in the field. Additionally, integrating inline geotextile laminators directly with the extrusion system creates composite drainage-barrier layers in a single pass, saving labor and improving bonding strength.
International engineering contractors are shifting from standard commodity sheets to custom polymer configurations. Key requirements include:
EVA copolymers are highly temperature-sensitive. Excessive heat or high shear forces in the extruder barrel can lead to cross-linking or thermal degradation, compromising the elasticity of the sheet. Gwell’s custom-engineered extrusion systems utilize low-shear, barrier-style single or twin-screws paired with intelligent liquid cooling zones. The T-Die features automatic lip adjustment driven by micro-thermal expanders and integrated beta-ray thickness scanners. This closed-loop control system continuously adjusts the melt flow profile, maintaining the strict tolerance margins required for high-risk tunneling applications.
The cooling and crystallization rate of the EVA sheet determines its ultimate flexibility and puncture resistance. Gwell utilizes a vertical three-roll calender unit equipped with independent dynamic oil heating and cooling controls. Surface embossing patterns (such as diamond, dotted, or smooth finishes) are engraved onto the calender rollers to optimize field-bonding with geotextile layers or shotcrete. Inline dual-station winding systems with automatic tension control ensure that the finished heavy-gauge rolls are tension-free, preventing curl and memory deformation when rolled out on the irregular rock faces of deep tunnels.
China GWELL Machinery is a high-tech enterprise dedicating to the manufacture of plastic extrusion lines for Film, Sheet and Profile. Relying on the powerful technology and equipment of group and innovative spirit , GWELL commits to the development of high-tech products and international market. "Expertise creates customers' values" has always been the company's operating philosophy.
With three manufacturing bases in Taicang, Changzhou, and Liyang, Gwell leverages vertical integration—from raw steel forging and mechanical machining to custom PLC control programming. This structure ensures shorter lead times, strict manufacturing tracking, and rapid response for custom modifications. Gwell collaborates with engineering universities to continuously refine barrier screw designs, screw metallurgy, and energy-saving heater bands, ensuring long-term mechanical reliability under continuous operating conditions.
Engineered for high performance, Gwell’s systems utilize advanced techniques and specialized engineering to deliver reliable solutions.
Collaborate with leading domestic universities and research institutes to develop high-tech polymer extrusion machinery.
Provide end-to-end services from equipment layout and raw material selection to commissioning and training.
Three major production bases with an annual production capacity exceeding 1000 extrusion lines worldwide.
Gwell lines sell globally, meeting the regulatory standards of North America, Europe, Southeast Asia, and beyond.
Our team includes 500+ employees and over 100 senior mechanical and software control engineers.
Explore Gwell's engineering capabilities across our primary product classifications.
GWELL Machinery Co., Ltd. presents the ASA cast film extrusion line, engineered for high weatherability outdoor surfaces.
Specially configured for processing thermoplastic polyurethane (TPU) films used in fabric composite lamination.
Gwell TPU cast film systems provide uniform elasticity and puncture resistance across technical textile membranes.
Engineered for solar backplanes, supplying a reliable alternative to Tedlar films with superior weathering resistance.
GWELL's PVB Wedge Film extrusion line delivers specialized wedge profiles for head-up displays (HUD).
Advanced co-extrusion technology for acoustic and safety glass interlayers in architectural applications.
A specialized manufacturing line tailored for agricultural chemicals and unit-dose detergent packaging.
Processing high-temperature polyimide (PI) materials for high-end electronics insulation substrates.
A leading solution in green polymers, creating eco-friendly consumer goods and soft barrier films.
Highly transparent, heat-shrinkable surface films optimized for furniture decors and premium packages.
Modern composite board systems targeting structural building panels and rigid waterproof flooring products.
High efficiency extrusion setups yielding recyclable concrete formwork panels with superior lifespans.
Extreme engineering plastics processing systems focused on chemical-resistant industrial paneling.
Gwell's high-capacity board line delivering uniform thickness and excellent impact-resistance characteristics.
Sophisticated multi-roll calendering systems optimized for high optical clarity polycarbonate sheets.
High optical uniformity systems producing precise light diffusion sheets for consumer LED panels.
Highly specialized composite systems integrating matrix substrates for industrial seal gaskets.
Optimized for thermal molding stability, manufacturing interior liners for refrigeration systems.
Multi-purpose board lines offering configuration flexibility for various automotive and sanitary applications.
Processing premium transparent copolyester structures with high impact resistance and rigidity.
Innovative elastomer sheet systems for automotive interiors, providing soft-touch tactile responses.
Pioneering sheet lines with high surface hardness ratings for display and safety glazing panels.
Specialized dual-color feedblock systems designed for stationeries and organizational dividers.
Engineered for food contact applications, offering high throughput and stable mechanical performance.
Pioneering biodegradable polylactic acid sheet systems targeting green packaging developments.
High-efficiency thermoforming sheet lines with integrated crystallization and moisture control.
Ultra-clean configuration for biocompatible polycaprolactone sheets used in low-temperature splints.
Providing high surface finish quality and minimal internal stress for optoelectronic parts.
Precision co-extrusion technology designed for aircraft, railway transit, and electrical casings.
Processing ionoplast interlayers designed for structural safety glass and solar module encapsulation.
Premium photovoltaic encapsulation lines generating stable polymer structures for solar modules.
Corrosion-resistant structural composite profile systems replacing aluminum solar mounting panels.
Advanced microporous separator production systems engineered for hydrogen fuel cell designs.
Pioneering solar encapsulation film lines featuring automatic shrinkage control and low cross-linking cycles.
Features high transparency and aging resistance properties for double-glass PV panels.
Multi-layer co-extrusion technology combining POE and EVA attributes for premium PID resistance.
High-efficiency safety glass lamination structures optimized for building-integrated photovoltaics.
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Gwell production lines conform to strict international safety and machinery building directives.
Expert answers addressing the extrusion, metallurgy, and processing queries of international engineers.
For modern railway and subway tunnels, the standard thickness ranges from 1.2 mm to 2.5 mm, depending on geological conditions and hydrostatic head pressures. Gwell's extrusion lines are designed to handle sheets up to 3.0 mm, maintaining strict thickness tolerances using integrated automated T-Dies.
The automatic T-Die uses closed-loop thermal expansion bolts connected to an inline beta-ray thickness gauge. If a thickness variation is detected across the sheet web, the PLC adjusts the power to the corresponding thermal bolt, altering the die lip gap in real-time. This reduces start-up calibration times and keeps thickness variations under ±1.5%, saving raw material.
The signal layer is a thin (usually 0.2 mm to 0.3 mm) light-colored (yellow or white) layer co-extruded onto a darker backing sheet. When the sheet is fastened to the tunnel rock face, any scratch or puncture during construction exposes the dark backing, providing a visual cue for inspectors to repair the damage before concrete is poured.
EVA is highly shear-sensitive and prone to thermal degradation if processed at excessive temperatures. We design low-shear barrier screws with a high L/D ratio (30:1 or 33:1) and incorporate multi-point ceramic barrel heaters with independent air-cooling fans. This maintains consistent melt temperatures and prevents polymer chain scission, preserving the required tensile strength and elongation metrics.
EVA and POE require precise low-shear screw configurations to prevent cross-linking, alongside dedicated calendering rolls to manage crystallization. PVC requires specialized anti-corrosion chrome plating on screws, dies, and barrels due to the release of hydrochloric gas at high temperatures. Gwell offers dedicated, metallurgy-optimized extrusion setups for each polymer family.
Gwell offers complete project coordination, including factory footprint layout design, remote commissioning assistance via IoT connectivity, and on-site engineering dispatch for installation, screw calibration, and operator training. Our spare parts inventory is managed across three Chinese production bases to support fast global logistics.
Gwell collaborates with global component manufacturers to ensure maximum machinery uptime and parts availability.
Heavy-duty, precision-engineered polymer processing lines designed for commercial fabrication plants.
High-yield geomembrane extrusion configurations yielding robust tensile and tear-resistant profiles for lining canals, reservoirs, and foundations.
Robust extrusion systems designed to process high-adhesion SGP safety glass interlayers under clean-room conditions.
Precision co-extrusion configurations yielding architectural BIPV PVB films with optimized electrical insulation properties.
High-capacity machinery built to extrude thick, high-density polyethylene sheets for engineering panels and marine structural applications.
Specialized PVDF casting configurations delivering high thickness accuracy for photovoltaic backsheets and clean energy systems.
Proprietary wedge-profile control systems producing premium HUD interlayers with uniform optical characteristics.
Cleanroom-integrated extrusion lines engineered for processing thin Polyimide cast films for high-end electronic substrates.
High-efficiency calendar lamination machinery configured to produce scratch-resistant, eco-friendly PCTG decorative surfacing sheets.
GWELL's R&D capability and precision machining capability are widely recognized by global tunneling contractors and engineering agencies. Connect with our engineering sales team to design your custom extrusion layout.
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