To what extent should the polishing inside the PVC reactor be achieved?
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I would like to ask: when composite steel plates are used in PVC reaction vessels, isn’t polishing required? To what extent is polishing necessary? Is there any specific standard for this?
Requirements for the manufacturing precision of polymerization reactors: 1. Roughness: The roughness of the inner wall surface of the reactor should be ≤0.1μm, while the roughness of the surfaces of other structural components should be ≤0.5μm. 2. Runout tolerance: The radial runout of the shaft at the seal location of the mixing shaft shall be ≤ 0.20 mm, the radial runout at the shaft end shall be ≤ 1.0 mm, and the axial movement of the mixing shaft shall be ≤ 0.20 mm.
Mechanical + electrolytic polishing Ra≤0.1μm
The surface roughness of the inner wall of the kettle is ≤0.1μm, while that of other structural components is ≤0.5μm.
The equipment is large and complex – how to perform electrolytic polishing?
This post was last edited by clq20040107 on 2010-10-22 at 23:56. At Hubei Shanshui Chemical, each batch is automatically cleaned with high-pressure water after production, without the need for polishing.
Theoretically, the inner wall of the kettle should be as smooth as possible; from a design perspective, it is required that the surface roughness inside be ≤0.1μm. Theoretically, it is also possible to polish the used polymerization reactor to such a level, but the iron shovels used by the reactor cleaning staff during operation cause significant damage to the reactor walls. Since the thickness of the composite stainless steel layer is only 3 mm, if polishing is carried out strictly in accordance with the design specifications, the stainless steel layer will wear out after 2–3 years. Therefore, during major repairs, we usually start by using a high-pressure cleaner to thoroughly clean the interior of the tank, and polish certain areas; if the roughness inside is too poor, those areas are polished as well, though it is not necessary to achieve the design specifications.
Mechanical + electrolytic polishing: Ra≤0.1μm; internal components: Ra≤0.2μm
The kettle body and internal components of the polymerization kettle manufactured by Yibin Jiangyuan Huaji meet the standard of Ra≤0.1μm
Both the kettle body and internal components are subjected to mechanical + electrolytic polishing, with a factory control target of Ra≤0.1μm