What are the key points of quality control in the production process of thermal paper?

The key points of quality control in the production of heat-proof paper (waterproof, oil-proof, scratch-proof) involve a number of aspects that are crucial to ensuring the performance and quality of the final product. Here are some key quality control points:

1. Selection and inspection of raw materials

Quality of backing paper: Select high-quality semi-bleached wood pulp paper or fully bleached chemical pulp paper as backing paper to ensure the strength and stability of backing paper.

Thermal coating materials: Thermal coating materials are strictly screened to ensure the purity and stability of their main components (such as colorless dyes, phenols or other acidic substances).

Protective layer material: For the three heat-proof paper, the material selection of the protective layer is particularly critical, and it must have good waterproof, oil-proof and scratch-proof properties.

2. Coating process control

Coating uniformity: Advanced coating equipment and technology are used to ensure that the thermal sensitive coating and protective layer are evenly coated on the base paper to avoid uneven coating thickness.

Thickness control: strictly control the thickness of the coating to meet the performance requirements of the product. Too thick or too thin coating may affect the printing effect and service life of the product.

Drying conditions: After coating, the drying time and temperature should be strictly controlled to ensure that the coating is fully cured and the performance is stable. Insufficient drying may result in insufficient viscosity or easy peeling of the coating, while excessive drying may affect the flexibility and adhesion of the coating.

3. Print and black logo

Printing quality: When printing in color or black and white according to customer requirements, it is necessary to ensure that the printing pattern and text are clear, the color is full, and the position is accurate.

Black label printing: For the three anti-thermal paper that requires machine recognition, special attention should be paid to the printing quality of the black label to ensure that the black label color is full and the edge is clear to improve the machine recognition rate.

4. Cutting and processing

Slitting accuracy: Precisely slitting according to product specifications to ensure that the product size is consistent and the edge is flat after slitting.

Processing process: In the process of die-cutting, gluing and packaging, it is necessary to strictly control the operation process to avoid product damage or pollution.

5. Finished product inspection and storage

Finished product inspection: Strict finished product inspection of the produced three heat-proof paper, including appearance quality, printing effect, waterproof and oil-proof performance.

Storage conditions: Avoid long-term exposure to sunlight or high temperature environments during storage to prevent thermal coating aging or performance degradation. It is also important to keep the storage environment dry and clean.

6. Continuous improvement and prevention

Process optimization: Regularly evaluate and optimize the production process to improve production efficiency and product quality.

Preventive thinking: Establish a preventive quality management thinking, identify and solve potential quality problems in advance by means of data analysis and trend prediction.

In summary, the key points of quality control in the production process of three thermal sensitive paper cover raw material selection and inspection, coating process control, printing and black marking, cutting and processing, finished product inspection and storage, and continuous improvement and prevention. Through strict control of these key points can ensure the production of high quality three heat sensitive paper products.