PU sandwich panel manufacturer

Cold storage panel are typically composed of double-layer galvanized steel sheets and a layer of polyurethane (PU or PIR) insulation core material. Their thermal conductivity is only 0.024–0.041 W/m·K, providing excellent insulation performance. Common panel thicknesses include 50mm, 75mm, 100mm, 150mm, and 200mm. Thicker panels offer better insulation, lower refrigeration unit load, and more stable internal temperature.   The thickness of the cold storage panel directly determines the energy consumption, temperature control stability, and overall lifespan of the cold storage facility. Improper thickness selection can easily lead to temperature fluctuations, frost formation on the walls, increased power consumption, and panel deformation and damage. Storage temperature is the sole core factor in selecting panel thickness.   1. Fresh-keeping cold storage (+2℃ ~ +10℃) | 50–75mm is preferred. This temperature range is often used for preserving fruits and vegetables, fresh produce, dairy products, and in temperature-controlled food processing workshops. The temperature difference between the inside and outside is small, and the operating conditions are relatively simple. 50–75mm thick insulated cold storage panel fully meet the requirements, effectively blocking outdoor heat penetration and maintaining a stable internal temperature environment. This thickness offers high cost-effectiveness, balancing construction costs and long-term energy consumption, making it the optimal choice for above-zero cold storage.   2. Low-Temperature Cold Storage (-5℃ ~ 0℃) | 80–100mm is preferred This is primarily used for the low-temperature storage of cooked food, semi-finished meat products, and beverages. This temperature range already possesses low-temperature properties; using thin 50mm panels would result in insufficient insulation, leading to heat penetration, condensation on the panels, and dampness on the inner walls, damaging the storage environment.   80–100mm thick cold storage panel is the standard configuration for this scenario, significantly reducing hot and cold air exchange, eliminating condensation and frost problems, ensuring long-term stable operation of the cold storage, and effectively reducing energy consumption.   3. Conventional Cold Storage (-10℃ ~ -25℃) | 100–150mm is preferred  This temperature range is commonly used in commercial frozen goods, seafood, and meat cold storage warehouses, and is also the most frequently used freezing condition in cold chain engineering.   The industry prioritizes 100–150mm thick insulation panels. The high-density, thickened core material effectively locks in the low temperature, prevents cold air leakage, and reduces the frequency of refrigeration equipment start-ups and shutdowns.   4. Ultra-Low Temperature Quick-Freezing Storage (-30℃ ~ -55℃) | 150–200mm is preferred Quick-freezing workshops, deep-sea food storage, and medical low-temperature storage scenarios experience extreme temperature differences, requiring stringent insulation performance. Ordinary thickness panels are unsuitable.   150–200mm thick high-density cold storage panels are a mandatory standard for these projects. They can withstand extreme temperature shocks, preventing frost penetration, panel deformation, and temperature imbalances, protecting high-value goods. Although the initial investment is slightly higher, it ensures long-term stable operation of the cold storage and is a reliable solution for ultra-low temperature projects.   In conclusion, the appropriate thickness of the cold storage panel depends on the storage temperature of the cold storage facility. Selecting PU/PIR cold storage panel of different thicknesses based on varying temperature requirements can mitigate construction risks, reduce energy waste, and result in a cost-effective, stable, and durable high-quality cold storage unit.  

Sandwich panels are typically constructed by bonding two layers of facing material—such as color-coated galvanized steel sheets, aluminum sheets, or fiberglass cloth—with an insulating core. Depending on the core material, they are classified into PU, PIR, EPS, and rock wool sandwich panels. A comparative analysis of these types follows. Performance iIndex PU Sandwich Panel PIR Sandwich Panel EPS sandwich panel Rock wool Sandwich panel Thermal Conductivity（W/(m・K)） 0.022-0.028 0.018~0.023 0.038-0.042 0.040-0.048 Density(kg/m³） 36~45 kg/m³ 40~50 kg/m³ 10~18 kg/m³ 90~150 kg/m³ Hygroscopicity ≤ 3% ≤ 2% Low (closed-cell structure, water absorption rate ≤ 4%) High (porous structure, water absorption rate can reach 5%-10%) Fire Rating B2 B1 B2 Non-flammable (Class A), does not release toxic gases at high temperatures Sound insulation performance Moderate Moderate Lower High Weather Resistance Better (its UV resistance is superior to EPS, but still requires protection) Better than PU Poor (Subject to aging and deformation due to long-term exposure to ultraviolet rays) Excellent (resistant to high and low temperatures, anti-aging, unaffected by ultraviolet rays) Compressive / Flexural Strength Higher (with good toughness and strong impact resistance) Better than PU, more stable Medium (Susceptible to Impact Damage) High (strong in rigidity, but with high brittleness, prone to cracking) Cost Higher Highest Lowest Moderate   Based on the comparative analysis of the four types of core-material sandwich panels across various aspects: PIR sandwich panels offer the best thermal insulation and better fire resistance, delivering high overall cost-effectiveness, they are suitable for high- and low-temperature cold storage, blast-freezing facilities, cold-chain logistics warehouses, and EU-standard industrial plants. PU sandwich panels rank second in thermal insulation performance and are suitable for standard constant-temperature facilities, steel structure enclosures, temporary structures, and roofing or wall panels. EPS sandwich panels provide good thermal insulation at a low cost; being lightweight and easy to install, they are ideal for simple industrial buildings, temporary modular structures, construction site hoarding, and warehouses with lower specifications. Rock wool sandwich panels, distinguished by their superior fire resistance, are suitable for large shopping malls, office buildings, high-rise structures, hazardous chemical warehouses, explosion-proof workshops, and projects requiring Class A fire safety ratings.

Poultry are highly sensitive to temperature; large temperature differences can easily lead to illness and loss of appetite, directly impacting farming profits. Therefore, maintaining a stable temperature in poultry houses is crucial for successful poultry farming. Many farms now use sandwich panels to construct walls and roofs, easily achieving a constant temperature inside the house.   Sandwich panels have a three-layer composite structure: two metal protective panels on each side, and an insulating core in the middle. The middle zinc insulating layer has a very low thermal conductivity, providing excellent insulation. In summer, it blocks outside heat from entering the house, slowing down rapid temperature increases; in winter, it locks in the heat from the house's heating system and the poultry's own heat, preventing cold air from entering and significantly reducing the temperature difference between day and night. Compared to corrugated iron sheds and ordinary brick walls, sandwich panels offer better insulation, preventing stuffy days and cold nights.   The inner lining of the sandwich panels can be changed to suit different farming environments. For example, aluminum foil lining can be used for the roof of higher areas of the poultry house to prevent moisture and reduce condensation. For walls near the ground that are easily splashed with manure and wastewater, cement mortar cloth lining can be used, which is resistant to ammonia and manure corrosion and is not easily damaged by long-term washing. The thickness of the sandwich panels can be selected from 30mm to 50mm; the thicker the panel, the better the insulation effect. Farmers can choose the appropriate thickness based on the local climate and the required insulation level.   During installation, the sandwich panels are tightly joined, and the seams are sealed with sealant to prevent cold air from entering the poultry house and to prevent heat loss. Once the temperature stabilizes, frequent turning of heating or cooling equipment is unnecessary, saving considerable electricity costs. Poultry in a comfortable, constant-temperature environment are less likely to experience stress due to temperature fluctuations, resulting in more regular eating habits, faster growth, and a significantly lower probability of disease.   In summary, sandwich panels are easy to assemble, heat-insulating, durable, and cost-effective. Different thicknesses of sandwich panels can be selected according to different temperature requirements. They can maintain a stable temperature in poultry houses for a long time and improve the growth environment of poultry. They are a practical and cost-effective building material for modern poultry farms.  

The Sandwich panels are widely used in food processing factories due to their excellent thermal insulation, good moisture and water resistance, corrosion resistance, and excellent fire resistance.     1. Excellent thermal insulation performance. Generally, the thermal conductivity of PU/PIR sandwich panels is between 0.020 and 0.024 [W/(m·K)], providing good thermal insulation and effectively controlling indoor and outdoor temperatures to ensure food freshness.   2. Seamless splicing during assembly ensures good sealing, reducing the risk of bacteria and mold growth and enabling dust-free workshops.   3. The core material used in sandwich panels has a high closed-cell rate, is non-absorbent, and offers excellent waterproof and moisture-proof performance, ensuring food freshness.   4. The color-coated steel plates used in sandwich panels have high structural strength, strong load-bearing capacity, and good corrosion resistance.   5. Sandwich panels generally have a fire rating of B1 (PIR sandwich panels) or A (rock wool sandwich panels), offering excellent fire resistance and making them more suitable for high-temperature food processing workshops;   6. Sandwich panels are produced in modular form, requiring only on-site installation and splicing, resulting in simple construction, short construction period, less dust, and high cost-effectiveness.

There are many types of sandwich panels, and common mistakes when choosing industrial sandwich panels include:   1. Focusing solely on price and selecting panels incompatible with the core material. EPS sandwich panels are the cheapest and generally only used in ordinary factories. PU/PIR sandwich panels are chosen for cold storage, while rock wool sandwich panels are chosen for large logistics warehouses.   2.Confusing roofing and wall panels. Wall panels cannot be used directly for roofing. Roofing requires high-strength roofing panels with corrugated peaks to withstand strong winds and rain/snow.   3.Ignoring the density of the core material. Generally, EPS density ranges from 10kg/m³ to 20kg/m³, which can be selected based on different insulation requirements; Rock wool density ranges from 80kg/m³ to 140kg/m³. It is generally not recommended to use less than 90kg/m³ for walls and less than 100kg/m³ for roofs.   4.     Ignoring the thickness requirements of the sandwich panel steel plate The thickness of the top and bottom plates of the sandwich panel can be determined according to the strength requirements of the building. Common thicknesses are 0.4mm to 0.8mm.   5.Ignoring the zinc coating thickness requirements of the sandwich panel Generally, the thicker the zinc coating, the better the corrosion resistance. Industrial buildings typically require AZ100 or AZ150.   6.Ignoring the color coating requirements of the sandwich panel steel plate PE coating can be used in ordinary environments, while PVDF coating can be used in coastal or highly corrosive environments.   7.Incorrect calculation of sandwich panel length, leading to excessive splicing It is recommended to provide CAD drawings. Our technical engineers will calculate the accurate number and length of panels to avoid errors.   8.Ignoring panel load-bearing capacity and span The panel thickness needs to be calculated based on the purlin spacing, load, and wind force of the industrial building to avoid placing orders blindly.