What are the printing processes for long-lasting three proof thermal paper?

The printing process of long-lasting three proof thermal paper mainly includes the following key steps:

1、 Selection of paper substrate

Substrate requirements:

Choose high-quality paper with a certain thickness and strength as the substrate, such as high-quality wood pulp paper, to ensure stability and durability during the printing process.

2、 Coating thermal sensitive pigments and pre coatings

Coating thermal sensitive pigments:

Apply a layer of "thermosensitive coating" (thermosensitive color changing layer) on the base paper, which is mainly composed of various chemical substances such as colorless dyes, color developing agents, sensitizers, stabilizers, adhesives, etc. These components can undergo chemical reactions under heating conditions, releasing colors.

Coating pre coating:

Pre coating is commonly used to improve the smoothness, ink absorption, and printability of paper. The pre coating coating liquid may contain dispersants, inorganic pigments, water retention agents, defoamers, styrene butadiene latex, and other components.

3、 Apply top coating

The function of top coating:

The top coating is the key to achieving the "three protections" (waterproof, oil resistant, and friction resistant) characteristics of long-lasting thermal paper. It improves the durability and anti pollution ability of paper by coating a special protective layer on the thermosensitive coloring layer.

Composition of Top Coating Liquid:

May contain dispersants, inorganic pigments, zinc stearate, polyvinyl alcohol, VAE latex, polyethylene wax microparticles, etc. These components work together to improve the porosity, ink absorption, wear resistance, and anti adhesion of the coating.

Coating method:

By using methods such as roll coating, spray coating, metering rod coating, or film transfer coating, the top coating liquid is evenly applied to the surface of the thermal paper.

4、 Drying and curing

Drying method:

After coating, the paper needs to undergo drying and curing treatment to ensure that the coating firmly adheres to the paper and achieves the best printing effect. There are various drying methods, including airflow drying under low temperature conditions and rapid drying using ultraviolet lamps.

5、 Subsequent processing

Cutting and packaging:

Cut and package the dried thermal paper to meet different market demands.

Quality inspection:

Throughout the entire production process, strict quality inspections are conducted on raw materials, semi-finished products, and finished products to ensure that the quality of thermal paper meets standards and customer requirements. The testing content includes the flatness of the paper, the uniformity of the coating, the printing effect, and durability.

6、 Special process (optional)

Die cutting, hot stamping, laminating, etc.:

According to customer needs, special treatments such as die-cutting, hot stamping, and laminating can be performed on thermal paper to increase the added value of the product.

7、 Precautions

Process control:

Throughout the entire printing process, it is necessary to strictly control parameters such as coating thickness, drying temperature, and time to ensure product quality.

Environmental requirements:

With the increasing awareness of environmental protection, more and more long-lasting three proof thermal paper is made of environmentally friendly materials that can be recycled and reused.

In summary, the printing process of long-lasting three proof thermal paper is a complex and delicate process involving multiple steps and links. Through scientific formula design, strict process control, and comprehensive quality testing, high-quality and high-performance long-lasting three proof thermal paper can be produced.