What are the difficulties in the production process of three proof thermal paper?

The production process of three proof thermal paper has the following difficulties:

1、 Raw material selection and proportioning

Selection of Chemicals: Thermal sensitive coatings use over a dozen types of chemicals, including colorless dyes, colorants, sensitizers, fillers, adhesives, stabilizers, and lubricants. The selection of these raw materials not only affects the printing effect of thermal paper, but also directly affects its waterproof, oil resistant, and scratch resistant properties. Therefore, how to accurately select and proportion these raw materials is a technical difficulty.

Selection of substrate: The substrate for three proof thermal paper is usually paper, BOPP film, PET film, etc. Different substrates have a significant impact on the adhesion of coatings and the performance of the final product. Therefore, when selecting a substrate, factors such as its applicability, cost, and production efficiency need to be considered.

2、 Coating process

Uniformity of coating: The coating of thermal paper needs to be evenly distributed to ensure color consistency during printing. However, in the actual production process, it is difficult to ensure the complete uniformity of the coating due to factors such as coating equipment, process parameters, and raw material properties. This requires precise control of coating equipment and processes to improve the uniformity of the coating.

Thickness control of coating: The thickness of the coating has a significant impact on the performance of thermal paper. Excessive coating may result in poor printing performance and even damage to the print head; However, overly thin coatings may not provide sufficient waterproof, oil resistant, and scratch resistant performance. Therefore, how to accurately control the thickness of the coating is a technical difficulty.

3、 Drying and solidification

Control of drying speed: The purpose of drying is to fix the thermal coating applied to the surface of the thermal paper. However, excessive drying speed may result in incomplete curing of the coating, affecting the performance of the final product; However, a slow drying speed may reduce production efficiency. Therefore, it is necessary to precisely control the drying speed to ensure complete curing of the coating.

Setting of curing temperature: Curing temperature is one of the key factors affecting the performance of coatings. Excessive curing temperature may cause coating deterioration or damage to the substrate; However, a too low curing temperature may not fully cure the coating. Therefore, it is necessary to set an appropriate curing temperature based on the composition and performance requirements of the coating.

4、 Quality control and testing

Quality stability: Due to the presence of various chemicals in the coating of thermal paper, its performance may be affected by environmental factors such as temperature and humidity. Therefore, it is necessary to strictly control the production environment and process parameters during the production process to ensure the stability of product quality.

Improvement of testing methods: In order to ensure that the performance of the three proof thermal paper meets the requirements, a series of tests need to be conducted, including waterproofing, oil resistance, scratch resistance, printing effect, etc. However, these detection methods may be affected by factors such as equipment, personnel, and technical level, so it is necessary to continuously improve and enhance the accuracy and reliability of the detection methods.

In summary, the production process of three proof thermal paper involves multiple technical difficulties, requiring strict control of raw material selection and ratio, coating process, drying and curing, as well as quality control and testing. Through continuous technological innovation and process improvement, these difficulties can be gradually solved, and the production efficiency and product quality of three proof thermal paper can be improved.