The production process of BOPP color thermal synthetic paper

The production process of BOPP color thermal synthetic paper is a complex and fine process, which combines the bidirectional stretching technology of BOPP film with the coating technology of thermal sensitive coating. The following is a detailed description of the production process:

First, raw material preparation

1.Polypropylene raw material: Select high-quality polypropylene particles as the substrate raw material to ensure the physical properties and chemical stability of the film.

2.Thermal coating materials: Prepare color thermal coating materials containing thermal agents, which are usually in the form of microcapsules or dyes and are capable of rapidly chemical reactions when heated to produce color images or text.

Second, BOPP film production

1.Melt extrusion: The polypropylene raw material is heated and melted to form a viscous fluid melt. In this process, the heating temperature and melting time need to be strictly controlled to ensure the stability of the melt quality.

2.Filtration and metering: filtration and metering of the melt after melting to remove impurities and maintain the uniformity of the melt.

3.Casting and cooling: the melt is cast into a film through the mold, and the film is cooled and shaped quickly by the cooling device. In this process, the cooling speed and temperature need to be controlled to avoid internal stress and deformation of the film.

4.Bidirectional drawing: In a special drawing machine, the cooled film is stretched bidirectional (longitudinal and transverse). By stretching process, the molecular chain arrangement of the film is more orderly, and the mechanical and optical properties of the film are improved. During the drawing process, the drawing temperature and drawing ratio need to be strictly controlled to achieve the best drawing effect.

5.Shaping and winding: the stretched film is heat treated by the shaping device to make the molecular structure of the film more stable. The film is then rolled to facilitate subsequent processing and transportation.

Third, heat sensitive coating

1.Coating preparation: The thermal sensitive coating material is evenly mixed and adjusted to the appropriate coating viscosity.

2.Coating process: roll coating, scraper coating or spraying, the thermal sensitive coating material is evenly coated on the surface of the BOPP film. During the coating process, the coating speed and coating amount need to be controlled to ensure the uniformity and thickness consistency of the coating.

3.Drying and curing: The coated film is dried and cured by a drying device, so that the heat-sensitive coating is firmly attached to the surface of the film. The drying temperature and time need to be controlled during the drying process to avoid cracks or discoloration of the coating.

Fourth, follow-up treatment and inspection

1.Cutting and packaging: According to the need, the large roll of BOPP color thermal synthetic paper is cut into small rolls of different specifications, and the packaging is processed.

2.Quality inspection: Strict quality inspection of the produced BOPP color thermal synthetic paper, including appearance inspection, thickness measurement, tensile strength test, thermal performance test, etc., to ensure that product performance meets the standard requirements.

Fifth, environmental Protection and Sustainability

Focus on environmental protection and sustainability in the production process, the use of non-polluting production processes and equipment to ensure that the waste discharge in the production process meets environmental standards. At the same time, encourage the recycling of waste film and coating materials to achieve the recycling of resources.

In general, the production process of BOPP color thermal synthetic paper is a comprehensive production process integrating polymer material processing, coating technology and precision mechanical control. By continuously optimizing the production process and improving the product quality, the market demand for high-performance and environmentally friendly synthetic paper can be met.