What Core Materials Can A Continuous PU Sandwich Panel Line Process

Sep 29, 2026

A continuous PU sandwich panel line is a versatile automated production system tailored for manufacturing insulated sandwich panels. It supports multiple mainstream core materials beyond standard PU foam, adapting to diverse insulation, fireproof and structural needs.

Polyurethane foam stands as the most fundamental and widely processed core material by the continuous PU sandwich panel line, serving as the baseline material for the equipment’s design and operational logic. Rigid PU foam features a uniform closed-cell structure, low thermal conductivity, and excellent adhesion performance with metal or composite surface layers, making it ideal for high-efficiency thermal insulation panels. In the continuous production process, the line adopts precise automatic metering and high-speed mixing technology to blend polyol and isocyanate raw materials evenly. The mixed liquid is evenly poured onto the moving base surface layer, then undergoes continuous foaming, leveling and curing under the constraint of the double-belt conveyor system. The whole process realizes seamless integration of foaming and panel forming, ensuring consistent foam density and thickness across the entire panel surface. The continuous PU sandwich panel line can flexibly adjust foaming parameters to produce PU foam cores with different densities, meeting the insulation and structural strength requirements of different application scenarios such as building exterior walls, roofs and cold storage enclosures. Moreover, the integrated processing mode effectively avoids the uneven bonding and hollowing problems that easily occur in manual or semi-automatic production, greatly improving the overall quality stability of PU core sandwich panels.

Polyisocyanurate foam, commonly known as PIR foam, is another high-performance core material fully compatible with the continuous PU sandwich panel line, and it is an upgraded variant of traditional PU foam with optimized molecular structure. Compared with ordinary PU foam, PIR foam boasts enhanced fire resistance, high-temperature stability and structural rigidity, while retaining superior thermal insulation performance. The continuous PU sandwich panel line can complete the switching of material formula and process parameters through simple system debugging, realizing uninterrupted continuous production of PIR core panels. During processing, the equipment’s high-precision batching system accurately controls the proportion of modified chemical additives, which promotes the formation of a more compact and stable cellular structure in PIR foam during the curing reaction. The double-belt constant-temperature curing unit of the line provides a stable reaction environment, ensuring that the PIR core achieves complete cross-linking and solidification, thus endowing the finished panels with stronger flame retardancy and anti-deformation ability. This material processing capability enables the production line to meet the higher safety performance requirements of public buildings, industrial plants and special engineering facilities, expanding the application scope of finished sandwich panels in high-standard insulation and fireproof projects.

Rock wool is a typical inorganic fireproof core material that can be efficiently processed by the continuous PU sandwich panel production line, breaking the single processing limit of organic foam materials for the equipment. Made from natural basalt and other mineral raw materials through high-temperature melting and fiber forming, rock wool has excellent non-combustible performance, sound absorption and vibration reduction effects, making it a preferred core material for fireproof and sound-insulating sandwich panels. When processing rock wool cores, the continuous PU sandwich panel line adjusts the feeding and pressing process modules to adapt to the fibrous structure of rock wool. The automated feeding system neatly arranges rock wool strips or rock wool blankets with uniform thickness, and the precise pressing and positioning device ensures a tight fit between the rock wool core and the upper and lower surface layers. Different from the foaming forming of organic materials, the processing of rock wool focuses on precise positioning, seamless splicing and uniform pressing. The continuous operation mode of the line effectively solves the problems of low efficiency and uneven compaction in traditional intermittent rock wool panel production. Meanwhile, the equipment's adaptive tension control system avoids fiber crushing and layer separation during continuous pressing, ensuring the structural integrity and stable fireproof performance of rock wool core panels.

Glass wool, another high-quality inorganic fiber core material, is fully adaptable to the processing workflow of the continuous PU sandwich panel machine, complementing the material system of rock wool and organic foam. Glass wool is made from recycled glass and mineral raw materials, featuring light weight, ultra-low thermal conductivity, excellent sound insulation and heat preservation performance, as well as good environmental friendliness. In the continuous production process, the continuous PU sandwich panel line optimizes the feeding speed and pressing pressure parameters according to the soft and porous characteristics of glass wool materials. The automated spreading system can evenly lay glass wool cores with different thickness specifications, and the flexible pressing mechanism of the double-belt production unit ensures that the glass wool core is closely bonded with the surface layer without causing fiber compression deformation. The continuous processing mode realizes one-step forming of glass wool sandwich panels, with stable product size consistency and neat edge sealing effect. This processing capability allows the production line to manufacture lightweight and high-insulation panels suitable for indoor partition walls, ceiling systems and low-load building enclosure structures, meeting the lightweight and energy-saving design needs of modern buildings.

Expanded Polystyrene (EPS) foam is a cost-effective lightweight core material that can be stably processed by the continuous PU sandwich panel production line, enriching the equipment's product gradient coverage. EPS foam has the advantages of light weight, good thermal insulation, strong shock resistance and low production cost, and it is widely used in civil building insulation and temporary building enclosure panels. When processing EPS core materials, the continuous PU sandwich panel line adopts a targeted bonding and composite forming process. Different from the in-situ foaming of PU and PIR materials, EPS foam is pre-formed sheet materials, and the production line completes automatic feeding, glue coating, composite pressing and continuous curing of EPS sheets through a matched auxiliary feeding system. The equipment’s precise positioning and conveying system ensures the flatness and alignment of EPS cores during high-speed continuous operation, and the uniform pressure control realizes firm bonding between the core material and the surface layer. The efficient continuous processing mode greatly improves the production efficiency of EPS sandwich panels, while ensuring that the finished products have stable overall flatness and good thermal insulation performance, meeting the large-scale production demand of economical insulation sandwich panels.

The diverse material processing capacity of the continuous PU sandwich panel line stems from its modular and adjustable structural design, enabling it to switch flexibly between organic foam and inorganic fiber core materials. Each core material corresponds to independent adjustable parameters including feeding speed, curing temperature, pressing pressure and batching ratio, ensuring targeted processing for different material characteristics. This multi-material compatibility not only improves the utilization rate and functional diversity of the production line, but also allows manufacturers to produce sandwich panels with different insulation, fireproof, sound insulation and structural properties according to market demands. By matching different core materials with the automated continuous production process, the equipment can stably output high-quality, standardized and serialized sandwich panel products, fully adapting to the differentiated application needs of modern construction, cold chain logistics and industrial facility fields.

Sinowa is a professional manufacturer of sandwich panel machine in china, we provide diversified and high-performance sandwich panel production lines, including fully automatic continuous PU sandwich panel line and customized special lines to meet mass production and personalized order demands. These sandwich panel lines support processing multiple foam core materials, such as PU, PIR, mineral wool, rock wool and glass wool, covering different insulation and fireproof standards.

Featuring stable operation, high efficiency, energy saving and easy maintenance, our PU sandwich panel line deliver sandwich panels with excellent thermal insulation, fire resistance, sound insulation and lightweight durability. The finished panels are widely applied in industrial workshops, warehouse roofing and wall cladding, cold storage insulation, serving global construction and industrial insulation markets.

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