What is the coating process of BOPP color thermosensitive synthetic paper?

The coating process of BOPP color thermosensitive synthetic paper is a critical step that determines the final performance and printing effect of the paper. The following are the detailed steps of the coating process for BOPP color thermosensitive synthetic paper:

Surface treatment:

Before coating, it is usually necessary to perform surface treatment on BOPP film, such as corona treatment. The purpose of this step is to improve the surface tension of the film, enhance the adhesion of the coating layer, and ensure that the thermosensitive coating can firmly adhere to the film.

Preparation of coating solution:

Coating liquids are usually composed of thermosensitive color changing materials, adhesives, fillers, and other additives. These ingredients need to be mixed uniformly in specific proportions to ensure that the coated film has stable thermal sensitivity and good printing effect.

Coating operation:

Apply the prepared coating solution evenly onto the surface of BOPP film through the coating equipment. The coating process requires strict control of the concentration, coating amount, and coating speed of the coating liquid to ensure the uniformity and thickness consistency of the coating.

Common coating techniques include wet coating, gravure coating, and reverse coating. These technologies have advantages such as simple equipment, low processing costs, and suitability for large-scale production.

Drying and curing:

The coated film needs to undergo drying and curing treatment to remove solvents or moisture from the coating and ensure a tight bond between the coating and the film substrate.

The temperature and time for drying and curing need to be adjusted according to the composition and properties of the coating to ensure complete curing and good scratch and chemical resistance.

Rolling and slitting:

The dried and cured film will be rolled into a uniform large roll. During the winding process, it is necessary to control the tension of the contact roller and pressure roller to maintain the flatness and tightness of the large film roll.

According to customer requirements, large film rolls will be cut into appropriate sizes. The slitting process requires strict control of slitting accuracy and edge quality to ensure the quality and performance of the final product.

Timeliness processing and quality inspection:

The sliced film usually needs to undergo aging treatment to further improve its physical properties and stability. The processing time for timeliness is usually between 24 and 48 hours.

Finally, quality inspection is conducted on the aged film, including appearance quality, physical properties, printing effect, and other aspects. Ensure that the final product meets relevant standards and customer requirements.

In summary, the coating process of BOPP color thermosensitive synthetic paper is a complex and delicate process that requires strict control of process parameters and quality requirements at each stage. By optimizing the coating process and formula, the performance and quality of BOPP color thermosensitive synthetic paper can be further improved to meet the application needs of more fields.