Will thermal label paper be affected by pH?

Thermal label paper will be affected by the pH. Specifically, this impact is mainly reflected in the following aspects:

First, the chemical reaction of heat-sensitive coating

The thermal coating on the thermal label paper is mainly composed of a variety of chemical substances, such as color forming agent, color developing agent, sensitizing agent, and stabilizer. These chemicals remain stable over a specific pH range, ensuring the quality and stability of thermal printing. However, when the paper comes into contact with acidic or alkaline substances, the stability of these chemicals may be damaged, leading to unnecessary chemical reactions in the heat-sensitive coating, which in turn affects the printing effect.

Second, the durability of the printed content

The printed content on the heat-sensitive label paper is shown by heating the colorless dye to react chemically with the color developer. The durability of this chemical reaction is affected by a number of factors, of which pH is an important factor. In acidic or alkaline environments, the printed content that has already appeared may be faded or discolored, resulting in reduced readability and durability of the information.

Third, the physical properties of paper

The pH of the paper may also affect its physical properties, such as strength, flexibility and hygroscopic properties. In an acidic environment, the cellulose of the paper is easily destroyed, resulting in reduced strength and fragile paper. In an alkaline environment, the paper may absorb too much water, resulting in enhanced hygroscopicity and poor dimensional stability. These changes in physical properties may have an adverse effect on the use of thermal label paper.

Fourth, response measures

In order to reduce the impact of pH on thermal label paper, the following measures can be taken:

1.Control storage environment: Store heat-sensitive labels in a dry, ventilated, and light-free environment to avoid contact with acid and alkali substances.

2.Select the right paper: Select a heat-sensitive label paper with good acid-base stability according to the specific use scenario.

3.Regular testing: For long-term storage of heat-sensitive label paper, quality testing should be carried out regularly to ensure that its printing effect and physical properties meet the requirements of use.

In summary, thermal label paper is indeed affected by pH, which may be reflected in many aspects such as the chemical reaction of the thermal coating, the durability of the printed content and the physical properties of the paper. Therefore, when using and storing thermal label paper, it is necessary to pay attention to controlling its pH environment to ensure its use effect.