How to ensure the quality of colored copperplate label paper?

To ensure the quality of color copperplate label paper, you can start from the following aspects:

First, raw material selection and testing

1.Raw material quality: Select high quality pulp and coating materials as raw materials. Pulp should be sourced from reliable suppliers to ensure no impurities and uniform fiber length. The coating material should have good adhesion and weather resistance to ensure the printing effect and service life.

2.Raw material testing: Strict testing of raw materials, including smoothness, pH, absorption, dryness, flexibility and surface bonding strength. These indicators directly affect the printability and final quality of the label paper.

Second, production process control

1.Coating process: During the coating process, ensure that the coating is uniform and the thickness is consistent. Too thick or too thin coating will affect the printing effect and physical properties of the label paper.

2.Drying and calendering: During the drying process, the temperature and time should be controlled to avoid deformation or cracking of the label paper. The calender process can improve the gloss and flatness of the label paper, making it more beautiful.

3.Printing process: During the printing process, attention should be paid to adjusting the viscosity, fluidity and dryness of the ink to ensure that the printing ink layer is uniform, bright and not easy to fall off. At the same time, it is necessary to control the printing pressure to avoid problems such as unclear dot printing or powder falling due to excessive pressure.

Third, quality testing and standards

1.Gloss and uniformity: The use of gloss meter to detect the gloss of the label paper to ensure that it meets the specified standards (such as the international general requirements of more than 70% gloss, domestic is between 60-80% according to different uses). At the same time, check whether the surface gloss of the label paper is uniform to avoid affecting the color level and visual effect of the print.

2.Thickness and deviation: Measure the thickness of the label paper and ensure that the thickness deviation is within the specified range (such as the international thickness deviation is usually required within ±2%, and the domestic requirement is within ±3%).

3.Printing effect evaluation: Evaluate the printing effect of the label paper by printing the proof, including the color reproduction degree, handwriting clarity, and detail level richness. Qualified label paper should have a good printing color restoration rate and printing accuracy.

Fourth, storage and transportation

1.Storage environment: The labels should be stored in a dry, ventilated, and dark environment to avoid moisture, mold, or deformation. At the same time, pay attention to avoid contact with corrosive substances, so as not to damage the label.

2.Transportation protection: Pay attention to avoid collision and extrusion during transportation, so as not to damage the appearance and quality of the label paper. At the same time, take moisture-proof measures to ensure that the label paper is dry during transportation.

In summary, by strictly controlling the quality of raw materials, production processes, quality testing and standards, as well as storage and transportation, the quality of color copperplate label paper can be effectively guaranteed.