Welcome to the DESU PET blister sheet production site! Today, we will take you to experience the production process of yellow and purple PET plastic sheets, and explore the difference between colored PET sheets and transparent PET sheets.
PET plastic sheet production process
DESU’s PET plastic sheet production line adopts advanced extrusion-cooling-stretching process. The production process can be roughly divided into the following steps:
- Raw material preparation: Mix and dry PET granules, masterbatch, additives and other raw materials.
- Melt extrusion: The mixed raw materials are fed into the extruder and melted into PET melt under high temperature and pressure.
- Filtration and purification: Filter the PET melt to remove impurities and gases.
- Flat film molding: The PET melt is cast into a thin film PET sheet through a mold.
- Cooling and shaping: The PET sheet is cooled and shaped by a cooling roller.
- Stretching: The PET sheet is biaxially stretched to improve its mechanical strength and transparency.
- Cutting and finishing: The PET sheet is cut and finished according to specifications to make a finished product.
Production of colored PET plastic sheets
The production of colored PET sheets is basically the same as that of transparent PET sheets, but there is an additional step of adding masterbatch. In the raw material preparation stage, in addition to raw materials such as PET resin and additives, masterbatch needs to be added. Masterbatch is an additive composed of pigments, carriers, dispersants, etc., which can give color to plastic products.
The difference between colored PET sheets and transparent PET sheets
Color: Colored PET sheets have color, while transparent PET sheets are colorless.
Transmittance: The transmittance of colored PET sheets is lower than that of transparent PET sheets. The transmittance of colored PET sheets depends on the amount and dispersion of pigments. The greater the amount of pigment, the lower the dispersion and the lower the transmittance.
Application: Colored PET sheets are often used to make food packaging boxes, beverage bottles, cosmetic bottles, toys, etc., because the color can attract consumers’ attention and improve the visual effect of the product. Transparent PET sheets are often used to make food packaging boxes, beverage bottles, electronic product shells, etc., because transparency can show the appearance of the product and improve the grade of the product.
Comparison between colored PET sheets and transparent PET sheets
| Characteristics | Colored PET sheets | Transparent PET sheets |
| Color | Yes | No |
| Transmittance | Low | High |
| Applications | Food packaging, beverage bottles, cosmetic bottles, toys, etc. | Food packaging, beverage bottles, electronic product shells, etc. |
| Advantages | Attract consumer attention and improve product visual effects | Show product appearance and improve product grade |
| Disadvantages | Low transmittance | Easy to scratch |
Factors affecting the transmittance of colored PET plastic sheets
The factors affecting the transmittance of colored PET sheets mainly include:
- Masterbatch dosage: The more masterbatch is used, the lower the transmittance.
- Masterbatch type: Masterbatch with strong light absorption will reduce the transmittance, while masterbatch with strong scattering will increase the transmittance.
- PET sheet thickness: The thicker the PET sheet, the lower the light transmittance.
- PET sheet surface smoothness: The smoother the PET sheet surface, the higher the light transmittance.
Choose DESU
DESU is a famous PET sheet manufacturer in China, with a 20,000 square meter factory and 12 co-extrusion production lines and 4 coating production lines. The annual output exceeds 50,000 tons, and customers from more than 30 countries have chosen us. It mainly produces PP, PET, HIPS and other blister sheets.
