What key parameters need to be controlled when extruding steel skeleton reinforced pipes?

1. Temperature control
Temperature is one of the most critical parameters in the extrusion process. The extruder is usually divided into multiple heating sections, and the temperature of each section needs to be set according to the melting characteristics of the plastic raw materials. For example, for the commonly used polyethylene (PE) raw materials, the temperature of the front section of the extruder can be set slightly lower so that the raw materials can gradually soften; the temperature of the middle section needs to be higher to make the raw materials fully melted; the temperature of the back section gradually decreases to avoid overheating and degradation of the molten plastic. The temperature of the mold also needs to be precisely controlled to ensure that the molten plastic can be quickly cooled and shaped in the mold. The mold temperature will be lower than the temperature of the extruder to prevent excessive flow of the plastic in the mold.
2. Pressure control
During the extrusion process, the pressure is mainly generated by the extrusion of the plastic raw materials by the screw. The pressure in the extruder can be controlled by adjusting parameters such as the screw speed, the opening of the back pressure valve, and the feeding speed. Appropriate pressure can ensure the uniform distribution and full melting of the plastic raw materials in the screw, thereby improving the uniformity and strength of the product. However, excessive pressure may cause excessive wear of the screw and barrel, and even cause equipment failure. Therefore, it is necessary to regularly detect and adjust the pressure in the extruder to ensure that it is within a reasonable range.
3. Screw speed
The screw speed is an important factor affecting extrusion production efficiency and product quality. A faster screw speed can improve production efficiency, but it may also cause the plastic raw material to stay in the screw for too short a time, fail to fully melt and mix, and thus affect product quality. On the contrary, a slower screw speed is conducive to the full melting and mixing of plastic raw materials, but may reduce production efficiency. Therefore, it is necessary to reasonably adjust the screw speed according to production needs and product requirements. For products that require higher strength and uniformity, the screw speed can be appropriately reduced; for products that require higher production efficiency, the screw speed can be appropriately increased.
4. Feeding speed and extrusion speed
The feeding speed refers to the speed at which the raw material enters the extruder, while the extrusion speed refers to the speed at which the molten plastic is extruded from the mold. These two parameters need to be coordinated to ensure the stability and continuity of the extrusion process. If the feeding speed is too fast, it may cause the screw to overload or the extruder to be blocked; if the feeding speed is too slow, it may cause the extrusion speed to decrease, affecting production efficiency. The extrusion speed needs to be adjusted according to product requirements. For products that require thicker wall thickness, the extrusion speed can be appropriately reduced; for products that require thinner wall thickness, the extrusion speed can be appropriately increased.
5. Mold design and adjustment
The mold is another important parameter in the extrusion process. The design of the mold needs to take into account factors such as the shape, size and extrusion speed of the product. Reasonable mold design can ensure that the molten plastic is evenly distributed in the mold and quickly cooled and shaped. Wear and blockage of the mold are also important factors affecting product quality and production efficiency. Therefore, it is necessary to regularly inspect and maintain the mold to ensure that it is in good working condition.
6. Optimization and upgrading of steel skeleton reinforced pipe extrusion production line
With the continuous advancement of technology and the continuous development of the market, the steel skeleton reinforced pipe extrusion production line is also being continuously optimized and upgraded. For example, the use of advanced control systems to achieve automated production, improve production efficiency and product quality; the use of new screw and barrel structures to improve the melting efficiency and mixing uniformity of plastic raw materials; the use of advanced detection technology to achieve online monitoring and quality control, etc. These optimization and upgrading measures help to improve the overall performance and competitiveness of the steel skeleton reinforced pipe extrusion production line.