PTFE, PFA, FEP, PVDF Fluoroplastic products industry experts
Introduction of PTFE lining process
Classification:
Industry dynamics
Author:
PFA tube little sister
Source:
Dankai
Release time:
2022-12-31
Visits:
PTFE PTFE enjoys the reputation of "plastic king" and has extremely high chemical stability. The lining equipment processed with it can withstand almost all strong acids, strong oxidants, and also.
The corrosion of the original agent and various organic solvents is also suitable for a wide temperature range. Through certain processing technology improvement, the use of ≤ 2.5MPa under higher pressure can be realized.
Dankai PTFE lining equipment has been more and more widely used in chemical production enterprises with high corrosion resistance requirements.
For the application of pressure, temperature and other complex conditions of the environment, the PTFE lining structure is usually targeted to improve, such as: in the PTFE layer to add metal
The net can reduce the thermal expansion and contraction of the PTFE lining and improve the negative pressure resistance; the PTFE layer is added to the PTFE layer to improve the temperature resistance and deformation resistance.
PTFE lining can be divided into two kinds of loose lining and tight lining. Loose lining is generally the PTFE belt wound on the corresponding grinding tools, sintering molding on the grinding tools, after demoulding into the equipment, turning over
It is completed after the edge; it is characterized by a gap between the steel body of the equipment and the lining PTFE plate; it is suitable for conveying pipes and reaction cylinders with small temperature changes and positive pressure.
The advantages are simple process, low investment and fast forming. The disadvantage is that in the environment of negative pressure and large temperature changes, it is easy to cause the PTFE plate to collapse, bubble and flange edge.
Cracking and other problems; In the electric spark detection, the vacuum on some PTFE plates may not be detected.
Tight lining is to bond the surface treated PTFE plate to the inner wall of the steel body of the equipment with a special adhesive. The characteristic is that the steel body of the equipment is tight with the lining PTFE plate.
Tight bonding, no gaps; suitable for frequent changes in temperature and pressure and the larger changes in the environment.
Figure 1: PTFE anticorrosive lining Product Source: Network
The advantages are:
1. There will be no leakage point in electric spark detection;
2. The larger volume of the overall equipment lining, reduce the sealing point;
3. Not limited by the shape of the equipment, it can be lined with various forms of equipment, such as square. The disadvantage is that the surface treatment of the inner wall of the steel body of the equipment and the quality of the adhesive determine the stability of the lining.
Qualitative.
Due to the inherent defects of the loose lining process, there are many problems after it is applied to production. The tight lining equipment can be spliced because the lining plates can be spliced, and the spliced gaps are welded.
become a whole and thus are no longer constrained by the shape of the device. Foreign countries as early as the 1980 s on the use of tight lining process to replace the loose lining. In recent years, many domestic manufacturers have passed
Absorbing foreign tight lining technology, developed its own tight lining equipment technology. At present, China's PTFE lining technology has basically reached the international advanced level.
This article is originally created by Teflon's little sister. Welcome to pay attention and take you to grow knowledge together!
Key words:
PTFE, temperature, change, process, arrived, pressure, environment
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