As an indispensable material in modern construction and industrial fields, PE polyester color-coated sheets are favored for their excellent color stability, weather resistance and corrosion resistance. Its excellent quality is not only derived from high-quality raw materials, but also inseparable from exquisite production technology. This article will deeply explore the production process of PE polyester color-coated sheets and reveal the source of its quality.

一、Raw material preparation

1. Substrate selection

The substrates of PE polyester color-coated sheets are mostly galvanized sheets or galvanized sheets. These substrates have good corrosion resistance and processability, providing a solid foundation for the subsequent processing of color-coated sheets. When selecting substrates, their chemical composition, mechanical properties and surface quality must be strictly controlled to ensure that the substrate meets production requirements.

2. Coating preparation

Coating is the key to forming the color and protective layer of color-coated sheets. PE polyester coatings are composed of polyester resins, pigments, fillers, additives, etc., and must undergo precise weighing, mixing and grinding processes to ensure the uniformity and stability of the coating. At the same time, the coating formula must be adjusted according to product requirements to meet different usage environments and performance requirements.

二. Production process

1. Surface pretreatment

The substrate needs to be pretreated before coating to remove impurities such as oil, rust and scale, and improve the adhesion and corrosion resistance of the coating. Common surface pretreatment methods include chemical cleaning, electrolytic cleaning and sandblasting. Among them, chemical cleaning mainly uses pickling solution to remove oxides and rust on the surface of the substrate; electrolytic cleaning further removes impurities on the surface of the substrate through electrolysis; sandblasting uses high-speed sprayed sand particles to impact the surface of the substrate to form a rough microstructure and enhance the adhesion of the coating.

2. Coating and curing

The substrate after surface pretreatment enters the coating stage. Coating is usually carried out by roller coating or spraying, and the prepared PE polyester coating is evenly coated on the surface of the substrate. The thickness and uniformity of the coating must be strictly controlled during the coating process to ensure the color consistency and protective effect of the color-coated board. After coating, the substrate needs to enter the curing furnace for high-temperature baking to cause the resin in the coating to undergo a cross-linking reaction to form a hard coating film. The curing temperature and time need to be adjusted according to the type and performance of the coating to ensure the quality and performance of the coating film.

3. Cooling and post-processing

The cured color-coated sheet needs to be cooled to reduce its surface temperature and improve its hardness and wear resistance. The cooling method is usually air cooling or water cooling. After cooling, the color-coated sheet needs to be post-processed, including edge trimming, cutting and packaging. During the post-processing process, care should be taken to protect the surface of the color-coated sheet from damage to ensure the quality of the finished product.

三.、Quality control

1. Raw material inspection

Before the raw materials enter the factory, strict quality inspection is required, including chemical composition analysis, mechanical property testing and surface quality inspection. Only raw materials that meet the requirements can enter the production line for use.

2. Process control

Strict control is required for each link in the production process, including the cleanliness of surface pretreatment, the uniformity of coating preparation and coating, and the temperature and time of curing. Through a combination of online testing and random inspection, problems in the production process can be discovered and corrected in a timely manner to ensure the stable and reliable quality of the color-coated sheet.

3. Finished product inspection

Finished product inspection is a key link in ensuring the quality of color-coated sheets. The inspection content includes appearance quality, dimensional accuracy, coating thickness and adhesion. Only color-coated plates that have passed strict inspection can be sold from the factory.

Conclusion

The source of the quality of PE polyester color-coated plates lies in their exquisite production technology and strict quality control. By selecting high-quality raw materials, optimizing production process and strengthening quality control, high-quality color-coated plates with bright colors, good weather resistance and strong corrosion resistance can be produced. These color-coated plates are not only widely used in construction, home appliances and industry, but also bring more convenience and beauty to people's lives and work.