Explore our premium machinery range including offset printing lines, multi-station thermoformers, and customized precision thermoforming mold units.
Understanding melt pressure dynamics, L/D ratios, and shear stability in single screw systems.
Why Single Screw Extrusion remains the foundational technology for precision plastic sheet manufacturing.
In modern industrial polymer processing, the Single Screw Extrusion Machine plays a critical role in converting thermoplastic raw materials into high-quality sheets of uniform thickness. Unlike twin-screw systems which excel in compounding and mixing complex additives, single screw extruders are highly optimized for building stable melt pressures and delivering excellent thermal consistency, essential attributes for downstream applications such as thermoforming packaging containers.
The extrusion process is governed by solid conveying, transition melting, and viscous melt metering. As plastic pellets enter the feed zone through the water-cooled hopper throat, they are compacted by the rotating helical screw. The design of this screw—specifically the L/D (Length-to-Diameter) ratio (typically ranging from 28:1 to 33:1 for optimal homogenization) and the compression ratio (normally between 2.5:1 and 3.5:1)—determines the level of shear force and heat applied to the polymer matrix. High-precision ODM manufacturers use bimetallic barrels and custom flight profiles (such as barrier flights or Maddock mixing heads) to control viscosity degradation, minimize surging, and eliminate unmelted particles prior to the melt entering the T-die.
For thermoforming sheet materials such as PP, PS, PET, and bio-based PLA, the single screw extruder must maintain accurate temperature profiling across multiple heating zones. Using PID-controlled ceramic or electromagnetic induction heaters, temperatures are regulated within ±1°C tolerances. Maintaining consistent melt temperature ensures the final extruded sheet has a uniform gauge, preventing localized cooling failures, web tension drops, and structural thinning during thermoforming operations.
From Ruian Seven Star Machinery to Wenzhou Yicai Technology: Decades of innovation in mechanical processing.
The machinery industry is an important manufacturing field, it has its own industry characteristics. Technology-intensive is a major feature of the machinery industry, the machinery industry needs older technical support, including technology design, manufacturing process, automation control and other aspects of technology. Secondly, the manufacturing industry of machinery is complex, which involves the processing, welding, assembly and other complex processes of various metal materials. Mechanical products are widely used in various fields, so the machinery industry is increasingly demanding for environmental protection and energy saving, and international competition is becoming more and more fierce.
The company was founded in 2010, formerly known as "Ruian Seven Star Machinery", and changed to "Wenzhou Yicai Machinery Technology Co., LTD." in 2022. The company is located in Zhejiang Province, one of the coastal provinces in East China, with an experienced R & D team and advanced production equipment. The company mainly produces and sells thermoforming machine, curved offset press, plastic sheet machine and other mechanical equipment. Yicai machinery always adhere to the quality as the core, customer needs as the guidance, and constantly improve the product technology level and service quality, won the trust and praise of our customers.
Dedicated to customized configurations, high-quality component supplies, and comprehensive services.
The purpose of our service is that customers "buy with confidence, use comfortable". We develop appropriate programs according to customer needs, including logo design, equipment appearance color, and parts configuration.
Moving from manual operation to semi-automatic, and finally to fully automated intelligent operation. We insist on continuous innovation and product development to provide competitive solutions for changing market needs.
Our products adopt international advanced production processes and technology. We strictly implement international quality management systems to ensure product stability, durability, and high performance.
Our professional sales team provides exhaustive consulting to help customers understand equipment features, detailed technical parameters, output capacity calculations, and custom options.
We possess global trading experience, supporting clients across multiple continents. We help buyers navigate shipping logistics, customs documentation, and international import procedures.
We source structural and electrical components from top-tier global brands, including Siemens, Schneider, and ABB, mitigating electrical and mechanical failure risks during heavy operation.
Our design, mechanical engineering, and after-sales support technicians have extensive industrial expertise, allowing us to solve process engineering bottlenecks quickly.
We provide comprehensive warranty services, prompt spare parts delivery, and ongoing technical support, ensuring your manufacturing line operates with maximum uptime.
Harnessing the production ecosystem of Zhejiang coastal industrial zone to optimize equipment sourcing costs.
The power of regional manufacturing networks in Wenzhou & Ruian.
Purchasing polymer machinery from Wenzhou Yicai Machinery Technology Co., Ltd. grants global buyers direct access to the most integrated mechanical manufacturing ecosystem in East China. The Wenzhou-Ruian coastal cluster houses thousands of precision machine shops, heat-treatment facilities, and specialized suppliers of raw screw blanks (such as high-grade 38CrMoAlA nitrided steel). This localized industrial concentration drastically lowers the logistics costs of heavy steel frames, gearboxes, and electrical cabinets, allowing us to pass significant capital savings to our clients without compromising raw material specifications.
Moreover, Zhejiang's maritime infrastructure offers excellent logistics options. With proximity to Ningbo Port and Shanghai Port, shipping completed single screw extruders, heavy multi-station thermoformers, and curved offset printers is highly efficient. This supply chain proximity guarantees that spare parts, replacement heater bands, and custom thermoforming molds can be machined, packed, and shipped globally with minimal delay, preventing prolonged line downtime for international factories.
Ensuring CE alignment, ISO standards, and seamless field service support for multinational packaging facilities.
Overcoming cross-border technical barriers through proactive certification and support.
Sourcing industrial single screw extruders globally requires absolute alignment with localized electrical and safety directives. At Wenzhou Yicai Machinery, our machines are designed to meet strict CE (Conformité Européenne) directives and ISO9001:2015 quality control systems. We customize the control cabinets with UL-compliant components for North American buyers, and arrange specific safety interlocks, protective shrouds, and dual-channel emergency stop circuits to meet regional workplace safety regulations (like OSHA in the US or CE machinery directives in Europe).
To support overseas operation, we offer digital remote diagnostic assistance. By installing Ethernet/IP modules in our PLC units, our factory engineers can remotely monitor temperature curves, motor load variations, and hydraulic pressures in real-time, helping local operators troubleshoot minor setup issues without waiting for an on-site technician. For complex installations, Wenzhou Yicai deploys specialized installation teams to assist with mechanical alignment, water-cooling setup, and operator training directly at the client's facility.
High-quality machinery to serve every stage of your plastic processing, printing, and packaging factory line.
Comprehensive quality guarantees and strict project timeline control from raw materials to final packaging line delivery.
We promise that our product quality assurance system covers the whole process from raw material procurement, production and processing, finished product inspection to after-sales service.
Since the establishment of the company, we have always placed the customer's position at the top of the pyramid, and we will fill the needs of customers as the goal of progress.
In the process of customization, we track the entire assembly sequence of the factory products to ensure structural alignment and delivery on time.
Our extrusion and thermoforming machinery lines produce thin-gauge thermoformed packaging products for the food service and logistics industries.
Evaluating clean energy profiles, bio-degradable polymer setups, and automation trends.
Industrial developments shaping single screw design and downstream processes.
The global plastics processing industry is undergoing a rapid transition toward carbon footprint reduction and material circularity. These changes directly impact how single screw extrusion systems are manufactured. Modern factories require machinery that can handle variable viscosity resins, including post-consumer recycled (PCR) PP/PET and bio-based plastics like Polylactic Acid (PLA). PLA processing requires specialized screw profiles with lower shear rates to prevent premature thermal degradation, along with vacuum venting ports on the barrel to eliminate trapped moisture without hydrolysis.
Furthermore, energy consumption has become a primary driver of cost-performance metrics. Standard induction heater bands are being replaced by high-efficiency electromagnetic heating jackets, reducing heat radiation loss and energy consumption. Additionally, direct-drive permanent magnet motors are replacing older worm-gearboxes, resulting in quieter operations, less thermal wear, and higher mechanical torque efficiency at slow rotational speeds, ensuring long-term operational sustainability.
Peek inside our production facility and assembly floor where heavy equipment and tooling are produced.
Common questions concerning single screw extruder design parameters, maintenance, and custom ODM configurations.
For PP sheet processing, an L/D ratio of 30:1 or 33:1 is recommended to ensure complete polymer plasticization without shear degradation. For PET extrusion, which is highly sensitive to moisture and thermal breakdown, a vented barrel setup with an L/D ratio of 30:1 combined with a vacuum degasification zone is crucial to remove moisture before polymer degradation occurs.
Standard nitrided screws (e.g. 38CrMoAlA) show wear within 12-18 months when processing materials with abrasive mineral fillers like calcium carbonate or talc. Bimetallic screws feature a fused alloy layer (typically containing nickel, cobalt, or tungsten carbide) that provides up to 3 to 4 times greater resistance to wear, making it essential for processing filled or recycled plastics.
Our ODM services include design of customized screw geometries for specialized polymer formulations (including biodegradable plastics), modifications to structural frames to fit compact layouts, and integration of customized T-dies. We also offer customization of screen changers (manual hydraulic vs continuous backflush) and color branding to match existing factory standards.
Melt pressure stability is critical to prevent sheet thickness variations. Our single screw systems utilize high-precision melt pumps situated between the screw tip and the extrusion die. The pump uses close-tolerance counter-rotating gears to isolate screw pulsation and feed the die with a constant volumetric flow, ensuring down-channel thickness variation remains within ±1%.
The manufacturing process ranges from 45 to 75 days, depending on custom requirements. Standard single screw extruders with conventional dimensions are built in about 45 days. Fully customized lines featuring multi-layer co-extrusion feedblocks, automated calender stacks, and bespoke PLC configurations require up to 75 days, which includes 72 hours of dry testing prior to shipment.
We provide comprehensive installation site preparation layouts. The client must arrange a level concrete floor with sufficient load-bearing capacity, cooling water loops (normally via an industrial water chiller system), and electrical connections matching the specified voltage (e.g. 380V/50Hz/3Ph or 460V/60Hz/3Ph). We provide step-by-step schematics to ensure smooth site integration.
Analyze our sheet extruders, co-extrusion machinery, and specialized auxiliary wrapping systems.
As a high-tech enterprise, we provide production solutions in the fields of plastic sheet extrusion, thermoforming molds, and inline curved offset printing. Talk to an expert designer to customize your next packaging line.
101, Unit 1, Building 20, Zilai Industrial Park, Wanquan Town, Pingyang County, Wenzhou City, Zhejiang Province, China
Yicai Machinery
