How to prepare the coating of tag coated paper?

The coating preparation of tag coated paper is a complex and fine process, which directly affects the printing effect and performance of the final product. The following are the general steps and key elements for the preparation of tag coated paper coating based on relevant knowledge and experience:

First, basic steps of coating preparation

1. Raw material selection:

Pigments: Choose high quality pigments, such as precipitated calcium carbonate, ground calcium carbonate and kaolin, which have an important impact on the whiteness, hiding power and gloss of the coating.

Adhesives: Commonly used adhesives include natural adhesives and synthetic adhesives, such as latex, starch, etc., which have a key role in the bond strength and flexibility of the coating.

Additives: including dispersants, lubricants, defoamers and water resistants, these additives are used to improve the flow, smoothness and printing adaptability of coatings.

2. Raw material pretreatment:

Pigment treatment: In order to reduce the microbial content of the pigment and improve the stability of the paint, the pigment can be treated with a long-term anticorrosive fungicide. The specific treatment method and the amount of fungicide need to be determined according to the specific situation of the pigment and the requirements of the coating formula.

Adhesive treatment: Although the microbial content of the adhesive itself is not high, in order to further improve the stability and quality of the paint, the adhesive is sometimes sterilized.

3. Mixed preparation:

The treated pigment, adhesive and appropriate amount of additives are mixed evenly according to a certain proportion to form a stable coating system. The mixing speed and time need to be paid attention to in the mixing process to ensure that the components are fully dispersed and mixed.

4. Quality control:

After the preparation of the paint, a series of quality testing and control measures need to be carried out, such as microbial content detection, viscosity detection, pH detection, etc., to ensure that the paint meets the relevant standards and requirements.

Second, key elements and precautions

1.Raw material quality: The quality of raw materials directly affects the performance of the coating and the quality of the final product. Therefore, it is necessary to strictly check the selection of raw materials to ensure that the quality of raw materials meets the relevant standards and requirements.

2.Accurate ratio: The ratio of the coating needs to be precisely controlled, and the ratio between different raw materials will directly affect the performance of the coating and the printing effect of the final product. Therefore, in the preparation process, it is necessary to strictly follow the formula requirements.

3.Mixing evenly: In the mixing process, it is necessary to ensure that the components are fully dispersed and evenly mixed to avoid agglomeration or stratification. This helps to improve the stability and printing adaptability of the paint.

4.Microbial control: Since the paint may contain microorganisms, these microorganisms can affect the stability and quality of the paint. Therefore, effective microbial control measures need to be taken in the preparation process, such as the use of fungicides to treat raw materials.

5.Safety and environmental protection: In the preparation process need to comply with the relevant safety and environmental protection regulations and requirements to ensure the safety and environmental protection of the operation process. At the same time, it is also necessary to pay attention to the disposal and recycling of waste.

In summary, the coating preparation of tag coated paper is a complex and delicate process, which requires strict control of key elements such as raw material quality, accurate ratio, uniform mixing and microbial control. Through scientific and reasonable preparation method and strict quality control measures, the tag coated paper coating with excellent performance and good printing effect can be prepared.