Fireproof PU Sandwich Panel Machine

The fireproof pu sandwich panel machine is a highly automated professional equipment system specifically designed for producing polyurethane (PU) sandwich composite panels with excellent fireproof performance. This sandwich panel production line represents advanced manufacturing technology for modern building materials, capable of continuously producing lightweight, high-strength, and fire-resistant building panels that meet Class A or B1 standards.

sandwich panel machine

The entire polyurethane sandwich panel manufacturing line usually consists of multiple functional modules, including core units such as metal coil unwinding system, pretreatment equipment, polyurethane foaming system, composite compression molding unit, automatic cutting device, cooling section, stacking and packaging system, and central control system. Through PLC automation control and precision sensor monitoring, the entire pu sandwich panel line can achieve efficient and accurate continuous production.

The essential difference between fire-resistant polyurethane sandwich panels and traditional EPS sandwich panels is the use of a special flame-retardant formula polyurethane material. This material forms a dense carbide layer at high temperatures, effectively isolating oxygen and heat transfer, thereby achieving excellent fire resistance. The pu sandwich panel production line ensures the stability and consistency of product performance by precisely controlling parameters such as raw material ratio, foaming temperature, and pressure.

Core equipment composition and functional analysis

• Metal panel pretreatment system
  The metal panel pretreatment system is a key front-end equipment of the production line, mainly composed of an uncoiler, a leveling machine, a cleaning device, and a pretreatment unit. The unwinding machine adopts a hydraulic expansion shaft design, which can carry 3-5 tons of metal coil, and is equipped with an automatic centering device to ensure that the material is transported in the center. The leveling machine consists of 9-13 sets of rollers, which eliminate stress and deformation caused by the transportation and storage of the coil material.
  The pretreatment process includes four stages: chemical degreasing, water washing, phosphating treatment, and drying, using a spray treatment process. The specially designed spray system ensures that the treatment liquid evenly covers the surface of the plate, and the surface tension of the treated metal plate reaches 38-42dynes/cm, providing an ideal interface for subsequent composite. The pre treated metal plate is dried through a hot air circulation drying system, with a temperature controlled between 80-120 ℃ and residual moisture below 0.5%.

• Polyurethane high-pressure foaming system
  The core technology of fire-resistant polyurethane sandwich panels lies in their high-pressure foaming system, which consists of raw material storage tanks, temperature control units, high-pressure metering pumps, mixing heads, and conveying pipelines. The storage tank is equipped with stirring and heating devices to maintain a constant temperature of 25 ± 2 ℃ for isocyanates (MDI) and polyols. The precision of the high-pressure metering pump can reach ± 0.5%, ensuring precise control of the ratio of the two components between 1:1 and 1:1.1.
  The self-cleaning mixing head with innovative design adopts hydraulic drive, with a mixing pressure of 120-150 bar and a speed exceeding 6000 rpm, achieving nanoscale uniform mixing of raw materials. The system also integrates a special flame retardant addition device, which can accurately add phosphorus based, nitrogen based flame retardants or nano-sized aluminum hydroxide materials, making the finished product meet the A2 level fire protection requirements in GB8624-2012 standard.

• Continuous Composite Forming Unit
  The continuous composite molding unit is the largest part of the production line, usually consisting of a preheating section, a foaming section, a curing section, and a cooling section, with a total length of up to 30-50 meters. The preheating section adopts infrared heating method to preheat the metal panel to 40-50 ℃, promoting the adhesion between polyurethane and metal. The foaming section is equipped with a dual track pressure system, with an adjustable pressure range of 0.05-0.3MPa, ensuring uniform and consistent foaming thickness.
  The curing stage adopts a gradient temperature control design, gradually reducing the temperature from 80 ℃ to 50 ℃, to complete the complete crosslinking reaction of polyurethane. The latest technology adopts a microwave-assisted maturation system, which can shorten the maturation time by more than 30%. The cooling section is equipped with a dual system of water cooling and air cooling to ensure that the temperature of the board drops below 35 ℃ before leaving the machine, avoiding deformation during subsequent cutting.

Advanced Technology and Quality Control System

• intelligent control system
  The modern fireproof pu sandwich panel line is equipped with an intelligent control system based on industrial concepts. Integrated PLC, HMI, and remote monitoring module, capable of real-time monitoring of multiple process parameters.
  The polyurethane sandwich panel production line also adopts an advanced visual inspection system, which uses a high-resolution CCD camera to perform 100% online inspection on the surface of the panel, and can identify defects above 0.1mm.

• Energy saving and environmental protection technology
  The latest fireproof polyurethane sandwich panel production line integrates multiple energy-saving and environmental protection technologies: the foaming system adopts closed-loop cleaning technology, reducing solvent consumption by more than 90%; The exhaust gas treatment device reduces VOCs emissions to below 20mg/m ³ through catalytic combustion; The heat recovery system can recover over 60% of the waste heat for preheating the sheet metal.
  The polyurethane sandwich panel production line also innovatively adopts a water-soluble release agent spraying system, which reduces organic volatile emissions by 85% compared to traditional oil-based release agents. In terms of noise control, through overall sound insulation design and shock absorption treatment, the working environment noise is kept below 75dB, which meets occupational health and safety standards.

The products produced by the fireproof polyurethane sandwich panel production line are widely used in:

• Industrial plants and storage facilities
  

• Commercial buildings and large-scale complexes
  

• Cold chain logistics warehouse
  

• Cleanrooms and pharmaceutical factories
  

• Prefabricated building module

Investors should consider their market positioning, financial strength, and technical support needs when choosing equipment, and prioritize equipment suppliers with mature processes and service capabilities to ensure that the pu sandwich panel machine can quickly reach production standards and obtain good investment returns after being put into operation.