Production Process Of PU Sandwich Panel Machine

The production process of PU sandwich panel machine mainly includes multiple links such as raw material preparation, mixed foaming, laminated molding, cutting and trimming, as well as quality inspection and packaging.

sandwich panel machine

Raw material preparation
The main raw materials for pu sandwich panels include isocyanates, polyols, catalysts, foaming agents, and foaming agents. These raw materials need to be accurately measured in specific proportions to ensure the quality and performance of the product. Among them, the molar ratio of isocyanates to polyols is usually controlled between 1.05-1.2, with an error not exceeding ± 0.5%.

Mixed foaming
In the mixed foaming stage, polyols react with isocyanates at a specific temperature to form end NCO prepolymers. Subsequently, the pre polymer, catalyst, foaming agent and other additives are mixed evenly and injected into the mold through a high-pressure mixing head. In the mold, the mixed material will quickly foam and solidify, forming a polyurethane foam layer with certain strength and thermal insulation performance.

Laminated molding
Laminated molding is one of the key steps in the production of polyurethane sandwich panels. At this stage, the foamed and cured polyurethane foam layer and double-sided steel plate (or other facing plates) are hot pressed and compounded through a laminating machine. The temperature of the laminating machine is usually controlled between 50-80 ℃, and the pressure is between 0.3-0.8 MPa. Through hot pressing, a firm bond will be formed between the polyurethane foam layer and the steel plate, thus ensuring the overall strength and stability of the sandwich panel.

Cutting and trimming
Cutting and trimming is the process of adjusting the dimensions and surface treatment of the produced polyurethane sandwich panels. At this stage, cutting equipment is used to cut the sandwich panel into the required size, and edge trimming and surface cleaning are carried out to ensure the appearance quality and dimensional accuracy of the product.

Quality Inspection and Packaging
Quality inspection is an important step in ensuring the quality of polyurethane sandwich panels. At this stage, various performance indicators such as thermal conductivity, compressive strength, and fire resistance will be tested on the produced sandwich panels. Only sandwich panels that meet relevant standards and requirements can be judged as qualified products. Subsequently, the qualified products will be packaged for storage and transportation.

The production process of pu sandwich panel machine is a complex and delicate process, which requires strict control of process parameters and quality standards in each link. By continuously optimizing production processes and improving the automation level of production equipment, the production efficiency and product quality of pu sandwich panels can be further improved.