2024 Author: Howard Calhoun | [email protected]. Last modified: 2023-12-17 10:16
PVC of the usual type are sheets that have a porous structure with a rough surface and a matte finish. If PVC is foamed, it is possible to obtain a tear-resistant and hard-feeling material with a smooth glossy surface, having a sandwich structure. Its inner layer will be porous, but the texture will remain uniform.
PVC foam production
In order to foam PVC and format the product from it, production lines are used, consisting of equipment such as an extruder, dies of the necessary calibrators, a cooler, a receiving device and a device that prepares the product for storage. Despite the fact that this production is complex in terms of physical and chemical indicators, the entire technological process takes place in a small, clean and tidy workshop.
The main raw materials in the form of loose mixtures and granules are delivered in plastic bags. On a small raw material site, stainless steel vats with stirrers are installed, into which it is poured,water is added. This is how the process begins, as a result of which foamed PVC will be obtained. Its production at first glance is very simple. Aged in vats for a day, the polymer component interacts with each other, matures, reaches the consistency of a molten mass and is fed into the receiving compartment of the extruder, which should foam the PVC with high quality.
Depending on the productivity of the enterprise, the extruder can be with one or two working screws. Specialists prefer installations with two screws. In them, the molten mass flows in parallel flows, so the temperature remains unchanged for longer, which allows foaming PVC evenly and without effort to achieve the required density in the product.
Screws convey the plastic mass for extrusion. Here (due to excess pressure) it is possible to foam the PVC, and then squeeze it out of the extruder through the holes that give the product volume and shape. Formed profiles, pipes, sheets, films enter the receiving table, from where they are fed onto a moving conveyor belt and are simultaneously cooled.
Cutting and decorating
For cutting PVC products, circular saws are used, equipped with a vacuum cleaner and a collector for fragments. Cutting of products is carried out at high speed. Then a decorative pattern can be applied to the surface. To do this, the process chain includes grainer machines that print images and markings directly on the PVC product. Decorative coating can imitate marble chips, plaster, have other typesclearance.
What is valued and where is it used?
Very valuable qualities such as strength, lightness and fine-mesh structure, which has foamed PVC. The photo attached to this article clearly demonstrates them using a pipe as an example. The porosity is clearly visible on the section, and this despite the fact that the surface of the product is shiny and smooth.
Resistance to external weather and climatic factors, chemical-physical interactions and corrosion has widely opened the door for this material to be used in construction, advertising business, agriculture, thermal power engineering, oil and gas and chemical industries, in everyday life.
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