What are the production standards for three proof thermal paper?

The production standards for three proof thermal paper mainly include the following aspects:

1、 Material standards

The material of the three proof thermal paper should be environmentally friendly and free of heavy metals and other harmful substances to ensure the safety and environmental friendliness of the product. At the same time, the selection of raw materials should also consider their water resistance, oil resistance, acid and alkali resistance properties to meet the special requirements of three proof thermal paper.

2、 Production process and process standards

Beating and blending:

The beating concentration and free degree of coniferous wood pulp and broad-leaved wood pulp need to be controlled within a certain range to ensure sufficient fiber separation and good pulp bonding strength.

When preparing the pulp, it is necessary to mix coniferous wood pulp and broad-leaved wood pulp in a certain proportion to achieve ideal paper properties.

Internet Forming and Squeezing:

The slurry needs to be sprayed into the mesh through the slurry box for molding and dehydration, and the ratio of the lip plate opening of the slurry box to the top mesh dehydration needs to be controlled within a certain range.

In the pressing step, the pressure of the shoe pressing line should be moderate to ensure the compactness and strength of the paper.

Drying and sizing:

The paper needs to be dried to remove excess moisture.

In the gluing process, the original starch needs to be cooked and gelatinized before being applied to the surface of the paper to improve its surface strength and printing performance.

Pressing and coiling:

In the calendering process, the pressure of the calendering light and the temperature of the calendering roller need to be controlled within a certain range to ensure the glossiness and flatness of the paper.

When coiling, it is necessary to maintain the neatness and tightness of the paper.

3、 Quality standards

The quality standards for three proof thermal paper usually include the following aspects:

Quantitative: Refers to the mass per unit area of paper, which needs to be controlled within a certain range to ensure the uniformity and stability of the paper.

Whiteness: Refers to the degree of whiteness of paper, which must meet certain standards to ensure printing quality and aesthetics.

Breathability: refers to the ability of paper to pass through gases, which needs to be controlled within a certain range to ensure the waterproof and oil resistant properties of the paper.

Tensile strength: refers to the ability of paper to resist tensile forces, which must meet certain standards to ensure the durability and stability of the paper.

Smoothness: Refers to the flatness of the surface of paper, which must meet certain standards to ensure printing quality and aesthetics.

Water absorption: refers to the ability of paper to absorb moisture, which needs to be controlled within a certain range to ensure the waterproof performance of the paper.

Moisture: refers to the moisture content in paper, which needs to be controlled within a certain range to ensure the stability and durability of the paper.

Ash content: refers to the content of inorganic substances in paper, which must meet certain standards to ensure the purity and quality of the paper.

4、 Specific standards

For special three proof thermal paper, such as used for thermal lottery paper, thermal label paper, etc., specific performance requirements must also be met, such as better image preservation performance, protective performance, etc. Meanwhile, with the increasing awareness of environmental protection, more and more three proof thermal paper is adopting environmentally friendly materials and processes to reduce pollution to the environment.

In addition, it is worth noting that with the continuous advancement of technology and changes in the market, the production standards for three proof thermal paper are also constantly updated and improved. Therefore, enterprises should closely monitor changes in relevant standards and regulations during the production process to ensure product compliance and market competitiveness.

In summary, the production standards for three proof thermal paper cover multiple aspects such as materials, production processes and techniques, quality, and specific standards. The formulation and implementation of these standards are of great significance for ensuring the quality, safety, and environmental friendliness of three proof thermal paper.