Appearance inspection:
First of all, the appearance of the paste needs to be inspected. Observe the color, texture, impurities and other conditions of the paste, and you can judge the quality of the paste. The normal paste should be milky white or yellowish, uniform in texture, and free of impurities. If the paste has problems such as uneven color and impurities, it means that the quality is not good.
pH detection: Secondly, the pH value of the paste needs to be detected. The pH value is an indicator of the acidity and alkalinity of the paste, and the pH value of the qualified paste should be between 5-8. If the pH is too high or too low, it will have an impact on the paper and the bonding properties. The pH value of the paste can be adjusted by adding an appropriate amount of acid or alkali to ensure the stability of its bonding properties.
Adhesion test:
Adhesion is one of the most important properties of paste, which directly affects the adhesion of paper. The cohesiveness of the paste can be tested experimentally. The paste is evenly applied between the two sheets of paper, and the pressure test is performed with an instrument to record the tensile force value when the paper is separated. If the tensile force value is too low, it means that the adhesive performance of the paste is not good;If the tensile force value is too high, it means that the adhesive properties of the paste are too strong. It is necessary to select the appropriate paste adhesion performance to ensure the bonding effect of the paper.
Anti-mildew detection:
Anti-mildew is another important performance indicator of paste. In a humid environment, the paste is prone to mold growth, which not only affects the adhesion of the paper, but also pollutes the environment. Therefore, it is necessary to test the anti-mildew strength of the paste. It is possible to simulate a humid environment under experimental conditions to observe whether the paste is mold growing. If mold growth is found, it means that the anti-mildew power of the paste is insufficient, and an appropriate amount of anti-fungal agent needs to be added to improve the anti-mildew power.
Cold Resistance Testing:
Cold hardiness is the ability of a paste to maintain its adhesion properties at low temperatures. In winter or low temperature environments, if the cold resistance of the paste is not good, it will lead to a decrease in the adhesive effect of the paper. Therefore, it is necessary to test the cold resistance of the paste. The paste can be placed in a low temperature environment to observe whether it crystallizes and precipitates. If crystallization, precipitation and other phenomena are found, it means that the cold resistance of the paste is insufficient, and an appropriate amount of antifreeze needs to be added to improve the cold resistance.
In short, the handling of the paste test report requires a comprehensive inspection and analysis of its appearance, pH value, adhesion, mildew resistance and cold resistance and other performance indicators to determine its quality and scope of application. For different properties of paper and different use environments, different types of pastes need to be selected to meet their needs such as bonding and protection. At the same time, it is necessary to pay attention to safety issues such as moisture-proof, sunscreen, and fireproof during storage and use to ensure the quality and safe use of the paste.