3 Reasons for Color Difference in Plastic Pellets Extruder Machine

Plastic pellets extruder machine is a machine that transforms waste plastic or raw plastic materials into plastic pellets by melting, extruding, cutting and other processes. However, in actual production, sometimes there is the problem of color difference, that is, the color of plastic pellets is not uniform.
The color difference not only affects the quality of the plastic granules but also the appearance and performance of the subsequent products. In this article, we will discuss in depth the reasons for the color difference in the production of plastic pellets extruder machine and the solutions.

Inconsistent quality of plastic raw materials

Diversity of raw material sources

Plastic raw materials often come from multiple suppliers or recycling sources, and the composition of the plastic from each source may vary, leading to color differences in the plastic.

Improper mixing ratios

During the regeneration process of plastic pellets extruder machine, mixing different sources and types of plastics in an unreasonable manner can lead to uneven colors and color differences.

Solutions

• Choose stable raw material suppliers and establish long-term stable cooperative relationship to ensure the stability of raw material quality.
• Strictly control the ratio and proportion of raw materials to avoid excessive mixing. Try to keep a single source of plastic raw materials used in plastic pellets extruder machine.

Improper temperature control of plastic pellets extruder machine

Unstable melting temperature

In the production process of plastic pellets extruder machine, the instability of melting temperature will lead to inconsistency of the color of the plastic melt and color difference.

Uneven cooling temperature

Cooling is an important step in the process of plastic pellets extruder machine, if the cooling is not uniform, it will lead to inconsistent temperature on the surface of the pellet, thus producing color difference.

Solutions

• Regular maintenance and repair of the recycled plastic pelletizing machine to ensure the stability of the temperature control system.
• Optimize the design of the cooling system to ensure that the cooling effect is uniform, to avoid differences in particle temperature.

Unreasonable screw design

Mismatch of screw structure

Plastic pellet melting machine screw is the key component to melt and extrude the plastic, if the screw structure does not match, it is easy to lead to the uneven flow of molten plastic, resulting in color difference.

Residue contamination

The accumulation of residues inside the screw may lead to the mixing of plastics of different colors, resulting in color difference.

Solutions

• According to different plastic types and characteristics, choose a suitable screw structure to ensure uniform flow of plastic melt.
• Clean and maintain the screw regularly to avoid residue buildup.