Is the aluminum foil lunch box hygienic and practical
Release time:
Sep 22,2023
1、 What is' Bai Ke Ding '?
White coating, commonly known as primer or undercoat, is a common white background color on packaging aluminum tubes. Its academic name is "saturated polyester resin", and chemically refers to a large class of polymers containing ester groups - COO - in the main chain structure.
It is mainly used for coil coatings, and can be used as the top coat, primer, back coat, etc. of coil coatings according to different resin properties and structures. The primer is usually white, but with the trend of diversified design, the color of aluminum pipe primer in consumer products has also become more diverse.
2、 How to apply primer on packaging aluminum pipes?
Some people may think that the primer is printed on the aluminum tube with printing ink, but in reality, it is applied to the surface of the aluminum tube through the "primer" processing program, which is to apply "saturated polyester resin". The specific process is:
1. The packaging aluminum tube that is stamped into a tubular shape undergoes a process of decoration, annealing, and internal spraying before coming to the roller of the bottom coating machine. When the bottom coating rotary table rotates, it drives the aluminum tube on the roller to press onto the rubber roller covered with primer, and the primer is applied to the aluminum tube.
2. The aluminum pipe with a good primer must be sent to an oven at around 180 degrees Celsius and baked at high temperature for several minutes to fuse the resin particles and solidify into a smooth protective film. After baking, let it stand and wait for the primer to cool before proceeding with the subsequent printing process.
3、 The Function of Primer "Baikeding"
1. Protect the surface of packaging aluminum tubes
The polyester resin used for the primer has good flexibility and adhesion, and can tightly bond with the surface of aluminum to form a protective film. This protective film has strong scratch resistance, can withstand slight scratches and collisions, and prevents oxidation and corrosion of aluminum materials.
2. Add decorative aesthetic effects
The primer can mask the original color of the aluminum tube, changing the overall visual effect of the packaging. The primer is mostly white and applied to the outer wall of the entire packaging aluminum tube. But now, in order to meet the diverse needs of packaging design, different colors can be chosen as primers, greatly improving the aesthetics of packaging aluminum tubes.
3. Improve the quality of printing
The trademarks, product descriptions, patterns, etc. printed on the packaging aluminum tube are all designed by brand merchants. However, in the production process, it is the process of primer that provides a good foundation for printing. The smoother and finer the primer, the better the subsequent ink printing effect, and the higher the quality of the produced packaging aluminum tubes.
Packaging aluminum tubes can be used for filling paste products such as cosmetics, toothpaste, lubricating grease, glue, etc., thanks to the sealing, oxidation resistance, corrosion resistance, and environmental friendliness of the aluminum tubes themselves. But as a packaging material for consumer products, in addition to having good sealing effect, it also needs to meet consumers' aesthetic needs. Every process in the production of packaging aluminum tubes is crucial.
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