How to make BOPP color thermal synthetic paper?

The production of BOPP color thermal synthetic paper is a relatively complex process involving multiple process steps and raw material ratios. The following is a general production process, but please note that the details may vary depending on the production equipment and raw materials.

1. Raw material preparation

Main raw materials: The main use of polypropylene (PP) resin, especially isotactic polypropylene, its content needs to reach a high standard (such as 95% to 97%) to ensure the tensile strength and physical properties of the film.

Functional fillers: Add functional fillers as needed, such as pigments, dyes, etc., to give the paper a specific color and functional characteristics.

Additives: including antioxidants, lubricants, fluorescent whitening agents, titanium dioxide, etc., to improve the processing properties of paper and the performance of the final product.

2. Mix and mix

The polypropylene resin, functional fillers and various additives are mixed evenly according to a certain proportion. The mixing process requires strict control of the proportion of raw materials and mixing quality to ensure the performance of the final product.

3. Extrusion and plasticizing

The mixed raw material is fed into the extruder for plasticizing. The processing temperature of the extruder is generally about 250 ° C, and the specific temperature is adjusted according to the temperature resistance of the raw material and the performance of the extruder.

In the plasticization process, the raw material is melted into a uniform melt after high temperature and high pressure in the extruder.

4. Casting and stretching

Casting sheet: The molten polypropylene melt is extruded into a thick sheet through the die head and quickly cooled into a regular thick sheet. The cooling process usually uses a chill roller and a sink, and the temperature is controlled at 30 ~ 45 ° C.

Longitudinal tensile: longitudinal tensile treatment of the cast, the tensile ratio is generally between 4.5 and 5.5. During the stretching process, the temperature of the preheating zone, the stretching zone and the shaping zone should be controlled to ensure the uniformity and tensile strength of the film.

Transverse stretching: transverse stretching of the cast sheet, the tensile ratio is generally between 9 and 10. Transverse drawing also needs to control the temperature of the preheating zone, drawing zone and setting zone, as well as the drawing speed, in order to achieve bidirectional drawing of the film.

5. Surface treatment and coating

Surface treatment: Corona treatment or other surface treatment is performed on the stretched film as required to improve the surface tension of the film and improve the adhesion of the coating layer.

Coating: Coating thermal sensitive coating, bottom coating and protective layer on the surface of the film. The coating process requires strict control of the composition, concentration and amount of coating liquid to ensure the performance of the final product.

6. Winding and slitting

The coated film is rolled into a uniform large film roll. During the winding process, the tension pressure of the contact roll and the pressure roll should be controlled to maintain the flatness and tightness of the large film roll.

The large film rolls are cut to the appropriate size according to customer requirements. The cutting precision and edge quality should be strictly controlled in the scuttling process.

7. Aging and testing

The cut film was aged. Aging treatment is generally completed within 24 to 48 hours to improve the physical properties and stability of the film.

The quality of the film after aging is checked, including appearance quality, physical properties, printing effect and so on. Ensure that the final product complies with relevant standards and customer requirements.

The above production process is for reference only, and the specific details may vary depending on the production equipment and raw materials. In the actual production process, it needs to be adjusted and optimized according to the specific situation.