Cold Room PU Sandwich Panel Line

Publication Date: Oct 12, 2026

The cold room PU sandwich panel line is an automated integrated production system tailored for thermal insulation panel manufacturing. It completes full-process production from raw material processing to finished panel shaping, delivering high-performance panels exclusive for cold storage and refrigeration space construction.

The entire production workflow of the cold room PU sandwich panel line starts with systematic surface material pretreatment, which lays a solid foundation for consistent finished product quality. The line is equipped with professional uncoiling and flattening units that handle coiled metal facing materials, the mainstream surface materials for cold room panels. These units operate at a stable constant speed to automatically release coiled materials, while multi-stage roller leveling structures eliminate common surface defects including wrinkles, uneven tension and subtle structural irregularities. This pretreatment process ensures the flatness and dimensional uniformity of surface materials, avoiding subsequent bonding gaps and surface deformation. Besides, the system supports continuous material feeding without frequent shutdowns, effectively improving production continuity and laying a reliable structural basis for the later foaming and composite molding process of polyurethane core materials.

After surface material pretreatment, the production line enters the roll forming stage, which shapes flat metal sheets into specialized profiles suitable for cold room assembly. Different from ordinary building panels, cold room sandwich panels require precise edge and groove structures to ensure tight splicing and airtightness of cold storage enclosures. The roll forming module adopts multi-group precision rolling dies that gradually bend and shape flat metal plates through repeated gradual pressing, avoiding sudden stress deformation that may damage the material structure. The whole forming process is fully automated with adjustable rolling parameters to adapt to different panel thickness and width specifications. Uniform profile precision ensures seamless assembly of finished panels on construction sites, effectively reducing cold air leakage and enhancing the overall thermal insulation effect of cold room structures.

Raw material proportioning and high-precision mixing is the core preliminary process that determines the thermal insulation performance of PU sandwich panels. The line is fitted with an independent multi-component metering system for polyurethane raw materials, mainly including polyol and isocyanate components matched with special auxiliary materials. Each metering unit achieves accurate flow control of single raw materials through stable transmission structures, realizing strict proportional matching during real-time mixing. This precise proportioning mode avoids performance defects such as uneven foaming, loose core structures and reduced heat insulation efficiency caused by material ratio deviation. The closed mixing environment also prevents external impurities from mixing in, ensuring the purity and reaction activity of polyurethane materials for subsequent foaming reactions.

Continuous PU foaming injection is the key stage forming the sandwich panel’s thermal insulation core. After uniform mixing, the liquid polyurethane composite materials are transported to the high-pressure injection device of the production line, which evenly sprays the raw materials onto the inner surface of the lower profiled metal sheet at a fixed flow rate. The injection range and thickness are precisely controlled to match the preset panel specifications, ensuring consistent core material distribution across the entire panel area. As the production line runs continuously, the upper and lower metal facing materials form a closed cavity, providing a stable space for polyurethane foaming expansion. The liquid materials start mild chemical reactions immediately after injection, laying the foundation for forming dense closed-cell structures that are critical for thermal insulation and pressure resistance.

Double-belt pressing and constant-temperature curing is a vital link to realize composite molding of sandwich panels. The semi-finished panels with injected PU materials enter the heated double-belt press device, where upper and lower circulating conveyor belts apply uniform and stable pressure to the panels. The internal temperature of the press is kept within a stable range to accelerate the cross-linking and curing reaction of polyurethane materials. Under dual effects of constant pressure and constant temperature, the liquid PU materials expand fully, fill the entire cavity, and gradually solidify into a rigid foam core. This process ensures tight bonding between the foam core and metal surfaces without degumming or hollowing, and shapes uniform closed-cell structures to endow panels with stable mechanical strength and excellent thermal insulation properties.

Intelligent fixed-length cutting and edge trimming processes ensure the dimensional accuracy and appearance quality of finished panels. After complete curing and molding, continuous integrated panel blanks are transmitted to the flying cutting unit, which adopts automatic induction positioning to complete fixed-length cutting according to set parameters. The cutting device runs synchronously with the production line speed to avoid shutdown cutting, maintaining continuous production efficiency. Meanwhile, the edge trimming mechanism finely polishes panel edges to remove burrs, uneven residual materials and irregular margins generated during cutting and molding. Precise post-processing makes panel sizes fully standardized, ensuring smooth on-site assembly and good splicing tightness between adjacent panels for cold room construction.

Surface protection and film covering treatment effectively improves the durability and usability of cold room PU sandwich panels. The production line is equipped with an automatic film covering module that attaches special protective films on both sides of finished panels after cutting and trimming. These protective films can prevent surface scratches, oxidation and corrosion during subsequent transportation, stacking and construction processes, maintaining the flat and smooth surface state of metal panels. The film covering process is highly automated with uniform film pasting and no bubbles or wrinkles, ensuring an intact protective layer. This process optimizes the finished product quality, reduces post-construction surface maintenance work, and extends the service life of panels in long-term low-temperature and humid cold room environments.

Automatic stacking and finished product output realize efficient and orderly collection of manufactured panels. The tail end of the production line is equipped with an intelligent stacking system that automatically adsorbs, lifts and arranges finished panels according to fixed specifications. The system controls the stacking speed and spacing accurately to avoid collision and extrusion damage between panels, keeping the structural integrity and surface quality of finished products. The stacked finished panels are neat and standardized, convenient for subsequent packaging, transportation and warehouse storage. The automated stacking mode replaces manual operation, greatly improves production efficiency, reduces labor costs, and realizes seamless connection with the front-end continuous production process.

The overall automated control system of the production line ensures stable and consistent long-term operation. The whole line adopts integrated programmable control to uniformly adjust and monitor parameters such as feeding speed, material ratio, pressing temperature, cutting size and operating rhythm. The intelligent control module can automatically identify and adjust subtle parameter deviations during operation, maintaining the stability of each production link. It also has real-time operation monitoring and fault early warning functions, which can timely feed back abnormal conditions such as material blockage and parameter errors. This intelligent management mode simplifies operation procedures, reduces manual operation errors, and ensures long-term stable output of high-quality cold room PU sandwich panels.

The cold room PU sandwich panel line delivers prominent comprehensive performance advantages for cold storage construction applications. Panels produced by this line feature dense closed-cell foam cores, extremely low thermal conductivity and excellent heat preservation and cold insulation effects, which can effectively reduce the energy consumption of cold room refrigeration systems. The tight composite structure of metal surface and PU core endows panels with good compression resistance, impact resistance and structural stability, adapting to long-term low-temperature and high-humidity working environments. In addition, the integrated production process ensures consistent product quality, standardized panel specifications and convenient installation, making the line a core equipment for efficient and high-quality manufacturing of cold room thermal insulation panels.

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