PTFE, PFA, FEP, PVDF Fluoroplastic products industry experts
Brief description of the manufacturing process of PTFE bellows
Classification:
Industry dynamics
Author:
FEP tube little sister
Source:
FEP tube little sister
Release time:
2008-09-17
Visits:
Introduction of 1. PTFE Bellows
PTFE corrugated pipe is also called PTFE corrugated pipe, Teflon corrugated pipe, Teflon corrugated pipe, Teflon corrugated pipe, Tao flon corrugated pipe, Deflon corrugated pipe. PTFE corrugated pipe is made of special inflation molding, the PTFE pipe in a certain mold heated to a certain temperature, the tube to give a certain internal pressure, so that the pipe transverse expansion (inflation) and then cooling stereotypes and made.
Features:
1. High temperature resistance 260 degrees, acid and alkali resistance, pressure resistance;
High transparency: low refractive index in all plastics;
3, aging resistance: can be exposed to ozone, sunlight for a long time, not aging;
4, corrosion resistance: able to withstand all strong acids, strong oxidants, strong reducing agents and various organic solvents except molten alkali metals, fluorinated media and those above 300 °.
5, the production process can be flanging, flange;
6. Corrugated shape has U-shaped and straight tube, other shapes can be customized;
7. Common colors: translucent, transparent, milky tube.
2. PTFE pipe specifications
Outside diameter (unit: mm) other specifications can be customized:
Metric system: outer diameter 6mm 8mm 10mm 16mm 20mm 25mm 38mm 60mm, etc.
Imperial: 1/8 inch, 1/4 inch, 3/8 inch, 1/2 inch, 3/4 inch, 1 inch.
Figure 1 PTFE bellows source: Teflon tube little sister
3. PTFE bellows FAQ
1. PTFE corrugated pipe forming machine technology:
A corrugated pipe forming machine, comprising a base, a lower mold belt, a hydraulic rod and a fixed tube. The bottom of the base is provided with a shock absorbing pad, and the inside of the base is inlaid with a shock absorbing layer. The base is fixed with a lifting device, and the lifting device is connected with a support plate, the support plate is fixed with a connecting rod, and the connecting rod is connected with a lower conveying device, the lower mold belt is connected with the lower conveying device, and the lower mold belt is connected with a mold, the hydraulic rod is fixed on the support plate, and the hydraulic rod is connected with a connecting plate, the upper conveying device is connected to the connecting plate, and the upper conveying device is fixed with a connecting piece. The upper mold belt is connected on the connecting piece, and both ends of the upper mold belt are connected with bolts, the fixed pipe is fixed on the upper conveying device, and the fixed pipe is provided with a nut. The damping pad is fixed at the bottom of the base, and the shape of the damping pad is wavy. The lower mold belt and the upper mold belt are both connected with molds, and the lower mold belt and the upper mold belt are installed in parallel. The connecting piece includes a sleeve, a convex rod, a spring and a threaded hole. The sleeve is provided with a convex rod, the bottom of the convex rod is connected with a spring, and the convex rod is provided with a threaded hole. There is a threaded connection between the upper mold belt and the upper conveying device, and the width of the upper mold belt is smaller than the width of the upper conveying device.
2. PTFE bellows seal:
At present, most of the applications on the market are filled with PTFE sealing surfaces, which encounter strong corrosive medium with particles, and the rapid wear of the sealing surface leads to the failure of the mechanical seal. And with the diversification of the application range of the pump supporting the main machine, it is often suitable for the medium containing particles, and the requirements for mechanical seals are also increasing. At present, the corrugated pipe mechanical seal devices on the market all use corrugated pipe as the torque transmission method, which makes the product insufficient in high temperature resistance. Disclosure of Invention The purpose of the present invention is to overcome the defects of the prior art and provide a mechanical sealing device for polytetrafluoroethylene bellows with high temperature resistance and strong corrosion resistance, which changes the transmission of polytetrafluoroethylene bellows into a dual transmission structure of polytetrafluoroethylene bellows and screw pins.
3. Turning of PTFE corrugated pipe:
The material of PTFE bellows is flexible, the structure is retractable, it is difficult to clamp when turning, and it is not easy to ensure the accuracy of the corrugated size. To this end, a specific corrugated pipe turning process is determined, and an elastic chuck and a through hole set fixture are designed for the elastic blank. The fixed-size tool is used to ensure the corrugated size, so that the processing accuracy of the corrugated pipe meets the design requirements, the sealing performance is stable and reliable, and the service life is long. It has been widely used in chemical pump mechanical seals. The process is simple, efficient, practical and reliable, and has a good reference for the processing of other plastic elastic thin-walled parts.
Fabrication Process of 4. PTFE Corrugated Pipe
It is made by special inflation molding. It is to heat the PTFE pipe to a certain temperature in a certain mold, and give a certain internal pressure in the pipe to make the pipe expand horizontally (blow up) and then cool and set. This bellows has the inherent properties of polytetrafluoroethylene, but also has high flexibility and elasticity. According to the corrugated shape, there are three types: V type, U type and Ω type. As a connector of corrosion-resistant pipeline, it plays a role in absorbing the change of pipeline length caused by thermal expansion and contraction, and has the function of dislocation connection of large rigid and brittle pipeline. In order to improve the performance, the bellows can also be reinforced with metal rings, metal sleeves, rubber, etc.
5. PTFE bellows use
1. It can be used as tubular reactor and exchanger in special occasions;
2. It can be used as the feeding and discharging pipes of tankers, storage tanks, containers and reaction kettles;
3, can be used to replace the low mechanical strength of graphite, ceramics, glass and other pipes;
4. It can be used for pipeline dislocation connection or to balance pipeline displacement, size change caused by climate or other reasons, or to eliminate the vibration of high frequency machinery.
Shenzhen Dankai Technology Co., Ltd. (ShenZhen DanKai Technology Co., Ltd.), whose predecessor was the Fluoroplastic Material Factory of Dongguan Dandi Insulation Material Co., Ltd. established in 1998, specializes in the research and development, production and sales of FEP, PFA, PTFE and other fluoroplastic tube rod sheet membrane products and other insulation materials. The company has international standards of senior R & D team and the introduction of foreign fluorine plastic products production line. Some fluoroplastic products through ISO9001, SGS, FDA certification, Huawei, Foxconn, the United States, ZTE, Intel, AirTAC and other domestic and foreign cooperation customers fully affirmed. The company's main products are: ① pipes: Ptfe pipes, Fep pipes, Pfa pipes, Pvdf pipes; ② Heat shrinkable tubes: Ptfe heat shrinkable tubes, Fep heat shrinkable tubes, Pfa heat shrinkable tubes, Pvdf heat shrinkable tubes; ③ Plate rod film: Ptfe plate rod film, Feep plate rod film, Pfa plate rod film, Pvdf plate rod film, etc. PE: PE, special, spiral tube, spring tube, rotary cutting tube, welding rod, tee, straight, gasket, joint, cone rod, flared tube, sealing tube, braided tube, corrugated tube, etc. At the same time can be customized according to customer requirements processing production of various specifications of fluorine plastic products.
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