The pipe wall of the winding pipe is loosely lined

Winding tube loose lining method cuts the molded PTFE rod into a thin strip with a lathe, and manually or mechanically winds the PTFE thin strip on a pre-designed mold to reach the required thickness , And then wrap three or four layers of alkali-free glass ribbon on the outside in the same way. It has good corrosion resistance and temperature resistance and is one of the ideal anti-corrosion methods. The PTFE steel lined composite pipe is made of two parts lining a PTFE lined pipe and a steel jacket. The outermost layer is tied with iron wire, and then sent to the sintering furnace to form.

Extrusion tube tight lining method The extruded PTFE tube whose outer diameter is slightly larger than the inner diameter of the steel pipe is pulled into the steel pipe by a mechanical method, and it is closely attached to the inner wall of the steel pipe through natural recovery, and then heated and flanged. Overview PTFE plastic has excellent corrosion resistance and heat resistance. Its integrity and uniformity are related to factors such as the tension during winding, the thickness of the film, the cleanliness of the film surface, the temperature and time during sintering, and it is difficult to grasp. When this kind of tube is produced, it has a large degree of freedom, from small diameter to large diameter.

There are roughly the following methods for lining tetrafluoroethylene pipes; one is the tight lining method, which is composited by mechanical methods through a certain process, and there is no gap between the lining layer and the matrix; second, the loose lining method is to use PTFE The vinyl tube is directly inserted into the steel pipe without any equipment and then both ends are flanged; the third is the powder metallurgy molding method (applicable to pipe fittings such as tees, crosses, elbows, reducers, etc. Principle features .

In all respects, extruded pipes are ideal for lining. PTFE BBQ Grill Mat Therefore, the maximum wall thickness of the winding pipe is not more than 3mm, the production process is many, the control is not strict, the processing method is mainly manual, the quality is unstable, and the powerful detection method is lacking, and the pipe wall of the winding pipe is loosely lined. tube. It can withstand almost any concentration of strong acid, strong alkali, strong oxidizing medium and organic solvent, and its chemical resistance exceeds all existing plastics.

It has strong integrity, smooth and clean inner surface, and is easy to inspect. With the development of tetrafluoroplastic molding technology and maturity of anti-corrosion technology, the application of tetrafluoroethylene lining in chemical production will become more and more common, among which tetrafluoroethylene steel-plastic composite pipe is an important application.

Wound tube is a kind of more widely used in the first production. Due to the large number of winding layers, it is difficult to control the process, and it is difficult to guarantee the integrity and uniformity after sintering. After sintering, it is taken out and cooled with water, and then demolded by manual or mechanical methods, and then covered Insert the steel pipe and complete it after flanging.

When the negative pressure and temperature difference fluctuate greatly, the pipeline is easy to collapse and the flange flanging part is easy to break. The tube is wound with turning film and sintered. However, its diameter is affected by processing equipment and can only process straight pipes below 300mm

The pipe wall of the winding pipe is loosely lined

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