How does BOPP color synthetic paper achieve color effects?

The process of achieving the color effect of BOPP color synthetic paper involves several steps and key factors, mainly including raw material ratio, production process and possible post-treatment. Here is a detailed breakdown of the process:

First,Raw material ratio

1.Basic material: The basic material of BOPP color synthetic paper is polypropylene (PP), especially isotactic polypropylene (iPP), which has good tensile properties and film formation, and is the main component of synthetic paper.

2.Color masterbatch: In order to achieve the color effect, it is necessary to add color masterbatch to the raw material. The color masterbatch is a kind of aggregate made by evenly dispersing pigments or dyes in the carrier resin, which can uniformly transfer colors to the film during the production of synthetic paper. The type and amount of color masterbatch determines the color depth and tone of the final product.

3.Additives: In addition to the color masterbatch, other additives may be added, such as antistatic agents, smoothing agents, anti-stick agents, etc., to improve the performance and workability of synthetic paper.

Second, the production process

The production process of BOPP color synthetic paper usually includes batching, extrusion, casting, bidirectional drawing, traction, winding, aging, splaying and other steps, which are directly related to the color effect of the batching and extrusion process.

1.Ingredients: According to product requirements, polypropylene, color masterbatch and other additives are mixed evenly in a certain proportion. In this process, the amount and uniformity of the color masterbatch are crucial to the color effect of the final product.

2.Extrusion: The mixed raw materials are plasticized and extruded in the extruder. Extruder processing temperature, screw speed and other parameters will affect the fluidity of the raw material and the uniformity of the film, thus affecting the color effect. In the extrusion process, the color masterbatch is fully mixed with the polypropylene substrate to form a uniform color melt.

Third, two-way stretching

Bidirectional drawing is one of the key steps in the production of BOPP color synthetic paper. The mechanical properties, optical properties and barrier properties of melt films can be significantly improved by longitudinal and transverse stretching. At the same time, the bidirectional stretching also helps to further uniform distribution of the color masterbatch in the film and improve the stability and consistency of the color effect.

Fourth,Post-processing (if any)

In some cases, post-processing may also be required to further enhance the color effect of BOPP color synthetic paper or to meet specific needs. For example, surface coating, printing, stamping and other processes can create a richer color and pattern effect on the surface of synthetic paper.

To sum up, the process of BOPP color synthetic paper to achieve color effect is a complex system engineering, involving raw material ratio, production technology and post-processing and other links. By precisely controlling the parameters and conditions of each link, BOPP color synthetic paper products with bright color, uniform stability and excellent performance can be produced.