Continuous PU Sandwich Panel Production Line

The continuous pu sandwich panel production line is a high-end manufacturing system in modern construction industry that integrates machinery, chemical engineering, and automation control. It is designed for efficient production of various types of insulation sandwich panels.

sandwich panel line

The continuous pu sandwich panel production line manufactures building panels with excellent thermal insulation properties by compounding surface materials such as color steel plates and aluminum foils with core materials such as polyurethane (PU), polyisocyanurate (PIR), or rock wool.

The core value of continuous polyurethane sandwich panels is reflected in three aspects: production efficiency brought by high automation, flexible production achieved by modular design (which can quickly switch to produce different specifications of products), and quality consistency guaranteed by precision control systems.

Unlike traditional intermittent production equipment, the continuous sandwich panel production line realizes the full process automation from coil unwinding to finished product stacking. A standard sandwich panel production line is usually between 45-100 meters long and integrates more than ten functional units such as unwinding, forming, foaming, curing, and cutting. This continuous operation mode increases production efficiency by 5-8 times compared to traditional methods, while precise temperature and pressure control gives the product a more uniform cell structure and more stable physical properties.

The material pretreatment system usually includes a dual station unwinding machine, a laser correction device, and a multifunctional forming unit. The hydraulic unwinding machine equipped with high-end equipment can handle steel coils weighing up to 5 tons. The unwinding tension is precisely controlled by a magnetic powder brake, and the deviation is controlled within ± 1mm by a photoelectric correction system.

The forming unit adopts gradient forming technology, which gradually deforms the flat coil into the designed plate shape through 16-22 rolling processes. The latest generation of equipment is equipped with a fast mold changing system, which can complete the plate type change in 15 minutes, saving 70% of time compared to traditional methods.

The foaming and laminating system consists of a precision collaborative unit consisting of a high-pressure foaming machine, a mobile pouring machine, and a double track laminating machine. Modern high-pressure foaming machines use servo metering pumps with a flow accuracy of ± 0.5%, combined with static mixers to achieve a mixing uniformity of over 98% for polyols and isocyanates.

The double track laminating machine is the largest equipment in the system, with a standard length of 24 meters and a pressure chamber composed of two sets of tracks. The technologically advanced models use electric servo lifting instead of traditional hydraulic cylinders, with a thickness adjustment accuracy of ± 0.1mm, and completely solve the common problems of asynchronous and oil leakage in hydraulic systems. The track shoes are made of special alloy steel that has undergone vacuum quenching treatment, with a surface hardness of HRC60 or higher. Combined with a precision guide rail system, the running straightness is maintained within 0.2mm/m. In terms of temperature control, the new equipment adopts a partitioned hot air circulation system, which controls the temperature difference between each area within ± 2 ℃ through PID algorithm, which is particularly critical for the high-temperature curing of PIR materials.

The post-processing system has achieved a magnificent transformation from the formed sheet to the final product. The follow-up cutting center is equipped with dual circular saws and hydraulic knives, using visual recognition or encoder positioning, with a cutting accuracy of ± 1mm. The palletizing robot achieves automatic stacking through vacuum suction cups or electromagnetic fixtures, and the latest system has the function of automatically identifying plate types and optimizing stacking modes, increasing loading rates by more than 15%.

The product specification range demonstrates the flexibility capability of the production line. In terms of thickness, it can produce boards with a thickness of 20-250mm, which can be quickly adjusted by replacing the side sealing blocks; The width is usually 900-1220mm, and special designs can be extended to 1500mm. The length can theoretically be infinitely extended, but in practice, it is generally controlled within 2-20 meters due to transportation limitations. The material combination is highly diverse: the surface layer can be made of color steel plate, aluminum foil, cement fiber board, etc; In addition to PU/PIR, the core material can also be adapted to inorganic materials such as rock wool, glass wool, mineral wool, etc., to meet different fire rating requirements.