Brief description of the advantages of sheet extruder melt pump

Melt pump has many advantages in sheet extruder, which are introduced in detail below:

I. Measurement and stable extrusion

a. High-precision measurement

The melt pump can control the flow rate of the melt. During the extrusion process of sheet materials, there is a high demand for uniform thickness. The melt pump can deliver the melt to the extrusion die at a very stable flow rate through its precise gear structure. For example, it can achieve a flow accuracy of ±1%, which means that when extruding sheets, it can ensure that the amount of melt passing through the die per unit time is almost the same, thus helping to produce sheet products with high thickness accuracy.

b. Stable extrusion pressure

The melt pump can effectively eliminate the pressure fluctuations generated by the upstream screw extruder. During the extrusion process, the screw extruder can cause pressure fluctuations due to factors such as uneven material delivery and slight changes in screw speed. The melt pump is equivalent to a pressure stabilizing device, which can convert this fluctuating pressure into a stable output pressure. It is like installing a pressure regulator in an unstable water flow pipe, allowing the water to flow out at a stable pressure, thus ensuring the continuity and smoothness of the sheet extrusion, reducing uneven thickness or surface quality issues caused by pressure fluctuations.

II. Improvement of product quality

a. Improve the quality of the sheet

Due to the ability of melt pumps to achieve metering and stable extrusion, they have a significant effect on improving the quality of sheet materials. When extruding thin sheets, such as plastic sheets for food packaging, which may have a thickness of between 0.1 and 0.5mm, the melt pump can ensure uniform sheet thickness and avoid local over- or under-thickness. Moreover, it can also make the surface of the sheet more smooth, because the stable melt flow can reduce the turbulence and irregular flow of the melt at the die head, thereby reducing the surface roughness and improving the appearance quality of the product.

b. Improve product performance consistency

For some sheets with strict physical performance requirements, such as those used for insulation in electronic devices, the consistency of their performance is very important. The stable extrusion of the melt pump ensures more uniform molecular orientation and crystallization within the sheet. Because the stable pressure and flow rate make the cooling and forming process of the melt during extrusion more stable, the produced sheet has better consistency in physical properties such as tensile strength and flexibility, ensuring the stability of product quality.

III. Production efficiency and cost control

a. Increase production speed

The melt pump can allow the extruder to operate at higher speeds while ensuring product quality. Due to its ability to stably transport the melt, it reduces the number of downtime caused by quality issues such as uneven thickness that require adjustments. For example, without a melt pump, the extruder may only be able to operate at a lower speed to ensure product quality due to pressure fluctuations or unstable flow. After installing the melt pump, the production speed of the extruder can be increased by 30% - 50%, greatly improving the production efficiency of the sheet.

b. Reduce the waste of raw materials

The metering function of the can reduce the waste of raw materials. During the extrusion process of the sheet, if there is no flow control, it may result in the waste of raw materials due to the excessive extrusion of melt, which may lead to the sheet being too thick and exceeding the standard. The melt pump strictly controls the flow rate to ensure that the thickness of the sheet meets the requirements, thereby reducing the waste generated by products that do not meet specifications and reducing production costs.

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