Continuous PU Sandwich Panel Line

Sinowa is a well-known manufacturer and technical service provider of high-end polyurethane insulation board production lines and various high-performance cold roll forming machine in China. Our main products include polyurethane double-sided color steel sandwich panel production line, polyurethane and phenolic soft facing insulation panel production line and high-efficiency roll forming machines.

Sinowa has invested outstanding efforts in continuous pu sandwich panel line, This is why our products are more efficiency, quality, automatic control technology, environmental protection, energy consumption indicators and the appearance and safety protection are comprehensively leading, Some subversive design changes in many major technical points,these major innovations make our products excellent in price/performance and user experience.

Sinowa is committed to the development and manufacturing of high-end and high-efficiency continuous pu sandwich panel line. Our sandwich panel production lines are leading the way in efficiency, automatic control, human-computer interaction, environmental protection and energy consumption. Using system integration and bus control technology, it realizes the automatic integrated linkage control of the entire production line, and can achieve remote interactive communication, which has the world-class level and a comprehensive leading high-performance production line in the market.

The continuous PU sandwich panel line represents a mature and advanced integrated manufacturing mode for producing composite thermal insulation and structural building panels, adopting fully automated continuous foaming, composite bonding, rolling forming and continuous cutting processes to integrate thin outer protective face materials and rigid polyurethane foam core materials into an integral lightweight composite structure in one continuous production flow. Unlike intermittent production processes that rely on manual auxiliary feeding and segmented pressing, the continuous production mode ensures that every finished panel maintains consistent structural density, uniform bonding compactness and stable overall mechanical performance throughout the entire production cycle, eliminating structural differences and performance deviations that often occur in batch discontinuous production. The core structural design logic of all panels produced by this production line follows the classic composite force-bearing principle similar to traditional I-beam structures, where the upper and lower outer face sheets undertake most of the in-plane tension, compression and bending loads, while the internal rigid polyurethane foam core bears all shear forces and disperses external pressure impact, forming a scientific combination of thin-wall stress-bearing surface and light-weight shear-resistant core. This unique structural collaboration mode endows the finished PU sandwich panels with the dual core advantages of ultra-light weight and high overall structural strength, fundamentally breaking the performance limitations of traditional single-layer building enclosure materials that struggle to balance structural bearing capacity, thermal insulation effect and construction convenience, and gradually becoming a core preferred material for modern prefabricated construction, low-temperature storage engineering, special environmental protection facilities and mobile modular building projects.

The structural performance of panels manufactured by the continuous PU sandwich panel line can be classified into multiple core categories according to differences in core foam density optimization ratio, face sheet material matching form, internal structural reinforcement design and overall stress-bearing structural rigidity, each tailored to adapt to different external load environments, service life requirements and complex application scenarios. The first major category is conventional light-load general structural PU sandwich panels, which are the most widely produced and versatile structural type in continuous production lines, featuring a standard matching design of medium-density rigid polyurethane foam core and ordinary thin metal face sheets. The internal foam core of this type of panel adopts a uniform and fine closed-cell foaming structure formed by continuous high-pressure foaming and uniform curing, with stable internal cell structure and no hollow gaps or uneven foaming areas inside the core layer. The face sheets on both sides are tightly compounded with the foam core through high-temperature continuous bonding integration, forming an inseparable integral composite structure without layered separation risks in conventional use environments. In terms of structural performance, this light-load general structural panel focuses on basic wind pressure resistance, daily mechanical impact resistance and uniform load-bearing capacity, with excellent structural stability under conventional natural environmental loads and ordinary building enclosure stress conditions. Its overall structural design does not pursue ultra-high ultimate bearing strength, but prioritizes balanced comprehensive performance, moderate self-weight and convenient on-site cutting and installation, ensuring that the panel can maintain long-term structural integrity without deformation, warping or core delamination under the action of conventional wind loads, slight vibration and daily external extrusion. This structural type also has inherent good cold bridge suppression performance, as the integral continuous composite structure avoids the cold bridge heat loss phenomenon caused by segmented assembly and gaps in traditional building enclosure structures, maintaining stable structural thermal insulation while ensuring basic structural safety.

The second category is high-strength heavy-load reinforced structural PU sandwich panels, which are upgraded and optimized on the basis of conventional general panels by adjusting the core material formula, increasing local structural reinforcement density and optimizing the thickness matching ratio of face sheets and core layers, specially developed for engineering scenarios requiring long-term bearing of heavy superimposed loads, strong wind pressure impact and frequent mechanical external forces. In the continuous production process, this type of panel adopts a high-density enhanced polyurethane foam core formula, with improved foaming compactness and internal cell wall thickness, effectively enhancing the core’s shear resistance and compressive deformation resistance. The face sheets use thicker and higher tensile strength materials, and the continuous production line adopts enhanced rolling composite and high-pressure curing processes to further improve the bonding strength between face sheets and core layers, ensuring that no relative sliding or layered separation occurs between different structural layers even under long-term heavy load and strong external force extrusion. Structurally, this reinforced panel can withstand long-term superimposed stacking pressure, frequent mechanical collision impact and extreme wind pressure loads in harsh environments, with excellent structural deformation resistance and fatigue resistance. It will not produce permanent bending deformation or internal core damage under the action of alternating strong external forces for a long time, and can maintain stable overall structural performance throughout the long service cycle. Different from light-load general panels that focus on basic enclosure functions, heavy-load reinforced structural panels take ultimate structural bearing capacity and long-term structural durability as the core design goals, optimizing every structural stress link from internal core shear resistance to external face tension and compression, adapting to harsh working conditions with high structural safety requirements.

The third category is special anti-corrosion and moisture-proof stable structural PU sandwich panels, with structural optimization focused on improving the overall structural stability and anti-aging ability in high-humidity, high-corrosion and harsh chemical erosion environments, suitable for special industrial production areas and humid and corrosive service scenarios. In terms of structural design, besides maintaining the basic composite stress-bearing structure of face sheets and foam core, this type of panel adopts anti-corrosion and moisture-proof optimized treatment for the bonding interface between structural layers and the edge sealing structure of the panel body in the continuous production process. The continuous integral edge sealing forming process eliminates structural gaps at the panel edges that are prone to moisture penetration and corrosive medium infiltration, effectively preventing humid air and chemical corrosives from entering the interior of the core layer to corrode the bonding interface and damage the internal structural stability. The internal foam core adopts a closed-cell structure with low water absorption rate, which will not absorb moisture and expand or deteriorate in structural performance after long-term use in high-humidity environments, maintaining stable shear resistance and structural integrity for a long time. The outer face sheets are matched with anti-corrosion structural materials, and the overall composite structure has strong resistance to chemical corrosion, atmospheric oxidation and humid erosion, avoiding structural performance attenuation and local structural damage caused by environmental corrosion. This structural type does not pursue excessive ultimate bearing capacity, but focuses on the long-term structural stability and anti-aging performance of the panel in adverse environments, ensuring that the structural bonding strength and mechanical properties do not decline with the extension of service time in high-corrosion and high-humidity working conditions.

The fourth category is thin-type flexible deformable adaptive structural PU sandwich panels, a special lightweight structural type produced by adjusting the continuous production process parameters, reducing core foam density appropriately and optimizing the flexibility matching of face sheet materials, mainly used for special-shaped building surfaces, curved enclosure structures and mobile temporary building facilities that require adaptive bending and deformation installation. Different from rigid structural panels that emphasize rigidity and deformation resistance, this structural panel is designed with moderate structural flexibility on the premise of ensuring basic structural safety, enabling the panel to undergo appropriate bending and adaptive deformation within a certain range during installation without core cracking, face sheet damage or bonding layer separation. In the continuous production process, the foaming curing time and composite pressing pressure are precisely adjusted to make the internal foam core have both basic shear bearing capacity and certain flexible deformation performance, and the matching face sheets also have good bending resistance and ductility. This special structural design enables the panel to adapt to various curved and special-shaped building enclosure layouts, solving the installation difficulty that traditional rigid sandwich panels cannot adapt to complex curved structural surfaces. While meeting the adaptive deformation installation requirements, the panel still maintains good basic thermal insulation and structural wind resistance performance, balancing flexible adaptability and basic structural safety, and providing reliable composite enclosure materials for personalized and special-shaped building design.

Each structural performance type of PU sandwich panels produced by the continuous PU sandwich panel line corresponds to targeted and differentiated practical application scenarios, covering multiple fields such as industrial construction, cold chain logistics storage, commercial public buildings, prefabricated mobile buildings, special environmental protection facilities and transportation auxiliary facilities, realizing the precise matching of panel structural performance and engineering use demand. Conventional light-load general structural PU sandwich panels are most widely used in the enclosure construction of ordinary industrial factory buildings, logistics warehouses, standard steel structure workshop roofs and wall enclosures, as well as exterior wall thermal insulation and roof enclosure of ordinary commercial buildings and civilian public facilities. These conventional building enclosure scenarios do not require the panels to bear excessive heavy loads or resist extreme harsh external forces, but focus on basic structural stability, good thermal insulation effect, fast on-site installation speed and long-term daily service durability. The lightweight characteristics of the panels reduce the overall structural load of the main building steel frame, effectively lowering the engineering construction cost and structural design difficulty, while the integral continuous composite structure ensures that the building enclosure has good wind and rain resistance and thermal insulation and energy-saving effects. In addition, this type of panel is also commonly used for simple prefabricated activity rooms, temporary construction office facilities and ordinary residential building exterior wall thermal insulation transformation projects, meeting the basic structural use and thermal insulation functional needs of conventional civil and industrial buildings with balanced and stable comprehensive performance.

High-strength heavy-load reinforced structural PU sandwich panels are mainly applied to large-span industrial plant roofs and walls, high-rise steel structure building external enclosure, large logistics distribution center storage area partition walls, and building parts that need long-term bearing of superimposed loads and resisting extreme weather impacts. Large-span industrial plants and high-rise steel structure buildings have high requirements for the wind pressure resistance, structural stability and overall deformation resistance of enclosure materials, and need to withstand the test of extreme weather such as strong winds and heavy rains for a long time. The high bearing capacity and strong impact resistance of heavy-load reinforced structural panels can effectively resist external extreme loads, avoiding structural deformation and damage of building enclosure under extreme weather conditions. In large logistics storage areas, partition walls and storage enclosure panels need to withstand frequent forklift collisions, cargo stacking extrusion and daily mechanical friction impact, and the reinforced structural design ensures that the panels will not be damaged or deformed by frequent mechanical external forces, maintaining the long-term stability and safety of the storage space structure. At the same time, this type of panel is also used for the roof and wall enclosure of large stadiums, exhibition halls and other large public buildings with high structural safety requirements, providing reliable structural protection and thermal insulation functions for large public buildings with complex structural stress.

Special anti-corrosion and moisture-proof stable structural PU sandwich panels are widely used in pharmaceutical purification workshops, electronic precision manufacturing workshops, chemical industry production plants, sewage treatment station enclosure structures, low-temperature constant-temperature storage warehouses and coastal high-humidity and high-salt spray building enclosure projects. Pharmaceutical and electronic precision manufacturing workshops have strict requirements for the internal cleanliness, structural sealing performance and anti-corrosion and moisture-proof performance of the enclosure space, and the anti-corrosion and moisture-proof structural design of the panels can effectively prevent moisture and dust from entering the workshop, maintaining the stability of the internal production environment. Chemical production plants and sewage treatment stations are in long-term corrosive and humid working environments, and ordinary building materials are prone to corrosion, aging and structural damage, while the anti-corrosion and moisture-proof stable structural panels can resist long-term chemical medium erosion and humid environment impact, maintaining stable structural performance and service life. Coastal buildings are affected by high salt spray and high humidity all year round, and the anti-corrosion structural design of the panels effectively avoids structural aging and performance attenuation caused by salt spray corrosion, ensuring the long-term safe use of building enclosure structures. Low-temperature constant-temperature storage warehouses also have high requirements for structural moisture-proof and thermal insulation performance, and the integral edge sealing and moisture-proof structural design of the panels prevents cold air leakage and moisture penetration, maintaining the stable low-temperature storage environment and extending the service life of the storage facilities.

Thin-type flexible deformable adaptive structural PU sandwich panels are mainly used for special-shaped architectural decoration enclosure, curved roof modeling of cultural and tourism landscape buildings, personalized creative prefabricated houses, tiny mobile houses and building facade curved thermal insulation and decoration integration projects. Modern architectural design increasingly pursues personalized curved shapes and special-shaped structural modeling, and traditional rigid building enclosure panels cannot adapt to curved surface installation and modeling needs. The flexible deformable adaptive structural panels can be bent and adapted according to the building’s curved surface design requirements, realizing the integrated construction of special-shaped building enclosure and thermal insulation. Cultural and tourism landscape buildings and creative commercial buildings often need unique facade modeling, and the flexible structural characteristics of the panels meet the dual needs of architectural aesthetic modeling and structural enclosure thermal insulation. Prefabricated tiny mobile houses and temporary creative mobile buildings have high requirements for panel lightweight, convenient transportation and rapid assembly, and the thin lightweight and flexible installation characteristics of this type of panel facilitate factory prefabrication and on-site rapid assembly, while adapting to different mobile building structural layout and modeling changes. This special structural panel fills the application gap of traditional rigid sandwich panels in special-shaped and personalized building scenarios, providing more flexible and diverse material choices for modern innovative architectural design and construction.

With the continuous advancement of prefabricated building industrialization and green energy-saving building development concepts, the continuous PU sandwich panel line will continue to optimize production processes and structural design formulas, and the structural performance types of produced panels will be further enriched and refined to adapt to more emerging engineering application scenarios. The core advantage of panels produced by continuous production lies in the high integration and stability of structural performance, realizing the organic unity of structural bearing, thermal insulation energy saving, environmental protection durability and construction efficiency. Different structural performance types of panels achieve precise matching with different engineering needs through targeted optimization of internal core structure, face sheet matching and overall structural reinforcement design, covering conventional building construction, special industrial facilities, cold chain storage logistics, personalized architectural modeling and many other fields. In the future, with the increasing demand for high-efficiency energy-saving and long-life durable building enclosure materials in the construction industry, PU sandwich panels with differentiated structural performance produced by continuous production lines will play a more important role in the field of modern construction and special engineering facilities, continuously promoting the development of the construction industry towards high efficiency, green energy saving and prefabricated integration.