The double-layer plastic sheet extruder is a high-efficiency composite extrusion system designed for the production of functional and multi-layer plastic sheets. By integrating dual-channel co-extrusion, precise material ratio control, and modular twin-screw technology, this machine enables the fabrication of high-performance sheet materials with tailored properties such as barrier protection, impact resistance, anti-static functionality, and biodegradability. It is widely used in food packaging, industrial logistics, medical applications, daily chemical packaging, and environmentally friendly materials. Offering full support for materials like PET, PE, PP, ABS, PLA, and PBAT, and thicknesses ranging from 0.2mm to 5mm, the equipment delivers superior flexibility for both standard and custom production demands.
The double-layer plastic sheet extruder, with its dual-channel collaborative forming technology and composite structure design, provides high-performance and multi-functional sheet production solutions for multiple industries:
In the food packaging scenario, the equipment produces composite sheet materials such as PET/PE and PP/PS through a double-layer co-extrusion process, which are used to make high-barrier preservation trays, microwave lunch boxes and easy-tear lid base materials. The twin-screw independent temperature control system can precisely match the melt index of the inner and outer layer materials (with an error of ≤±1.5%). Combined with vacuum adsorption shaping technology, it ensures that the surface flatness of the sheet material reaches ±0.02mm, while meeting the composite performance requirements such as oil resistance and high-temperature resistance (≥121℃), and conforming to international food contact safety standards such as FDA and LFGB.
To meet the demands of industrial protection and logistics packaging, the equipment can produce functional double-layer sheets such as HDPE/impact-resistant modified layer and ABS/conductive layer, which are used to manufacture moisture-proof pads, anti-static trays for electronic components, and buffer liners for heavy equipment. The dual-station co-extrusion die head supports dynamic adjustment of the ratio of inner and outer layer materials (1:9 to 9:1). Through the tension closed-loop control of the traction machine, the tensile strength of the sheet material is increased by more than 25%, and at the same time, multi-dimensional performance optimization such as puncture resistance and anti-aging is achieved, making it suitable for harsh environments such as storage and transportation, and mechanical manufacturing.
In medical settings, double-layer plastic sheet extruders can produce PP/breathable film composite sheets (for aseptic packaging of surgical instruments) and PE/antibacterial layer sheets (for medical trays). Through a cleanroom-level production environment and an online ultraviolet sterilization device, the microbial contamination rate is ensured to be less than 0.1CFU/cm². In the field of daily chemical products, it excels in processing PE/pearlescent layer sheet materials (inner lining of cosmetic boxes) and PS/anti-slip coating sheet materials (trays of personal care products). Relying on the quick-change color screw design, it can achieve continuous production of multi-color series sheet materials within 30 minutes, helping brands upgrade their differentiated packaging.
In the field of environmental protection, the equipment supports double-layer co-extrusion of PLA/PBAT biodegradable materials. Through the nitrogen-protected extrusion process, the oxidation and degradation of the materials are prevented, and the degradation rate of the finished product can reach over 95%. It is widely used as the base material for degradable shopping bags and tableware. In agricultural scenarios, double-layer PE/UV-resistant sheet materials can be used to produce greenhouse insulation film and seedling tray base plates. The dual-channel design enables the inner layer to retain water and absorb moisture, while the outer layer is resistant to sunlight and aging. Combined with an energy-saving electromagnetic heating system, the production capacity can reach 500-1200kg per hour, balancing efficient production and low carbon emissions.
The equipment adopts a modular twin-screw structure (the screw length-to-diameter ratio is optional from 30:1 to 40:1), supporting full-specification coverage from 0.2mm ultra-thin composite films to 5mm thick-walled structural sheets. For special requirements (such as anti-counterfeiting watermark layer, temperature-sensitive color-changing layer), a third functional layer co-extrusion module (customizable) can be integrated. Combined with CAE mold flow analysis to optimize the flow channel distribution, it ensures that the peel strength of the composite interface is ≥3N/15mm. Its intelligent control system can monitor the pressure difference of the double-layer melt in real time (with an accuracy of ±0.1MPa) and automatically generate production data reports, providing high-reliability composite sheet solutions for high-end fields such as aerospace and precision electronics.
