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Shenzhen Dankai fully analyzes the process of Teflon PTFE molded tube
- Categories:Industry news
- Author:Miss PTFE tube
- Origin:Miss PTFE tube
- Time of issue:2010-01-12 15:21
- Views:
Shenzhen Dankai fully analyzes the process of Teflon PTFE molded tube
- Categories:Industry news
- Author:Miss PTFE tube
- Origin:Miss PTFE tube
- Time of issue:2010-01-12 15:21
- Views:
In-depth analysis of Teflon PTFE molded tube process
Teflon generally refers to Teflon. Teflon is another name for Polytetrafluoroethylene, the English abbreviation is PTFE, (commonly known as "Plastic King, Hara"), and the chemical formula is -(CF2-CF2)n-. The brand name Teflon®, in China, due to the pronunciation, the trademark "Teflon" is also called "Teflon", "Teflon", "Teflon", "Teflon", "Special "Furon" and so on are all transliterations of "Teflon".
Teflon molding process introduction: Teflon is a material that is difficult to mold. Its characteristics determine that it cannot be injection molded. It can only be molded by molding and pushing. Teflon molding process is the most commonly used method. Teflon Dragon molding can process plates, rods, tubes, tapes, sealing rings, diaphragms and parts with metal inserts.
Figure 1: ptfe Teflon molded tube Source: Shenzhen Dankai
Teflon compression molding method: Teflon compression molding includes four steps of mixing, preforming, sintering and cooling. Pre-forming is to add PTFE powder evenly into the mold and press at room temperature to form a compact pre-form (ie rough); sintering is to heat the pre-form to above the melting point, and to cool down from the sintering temperature to room temperature the process of.
Some Teflon is pressurized once above the melting point temperature. This kind of forming mold is called a hot press mold, and the corresponding mold is called a cold press mold.
Attention should be paid to the influence of compression ratio (generally PTFE is 4-6) and molding shrinkage rate (generally PTFE is 2.6-4.5%) when molding PTFE.
The first step: It is best to use suspension method to polymerize the resin as the raw material, and the soft and fine powder with a particle size of 20-500 microns is the best.
The second step: the pressing process must be "deflated", the preforming pressure is 17-35 MPa, and the holding time depends on the thickness of the blank. For example, a 100 mm thick blank should be held for 15 minutes.
Step 3: When Teflon sintering, it should be noted that the heating speed can be 20-120℃ for hours. The larger the product, the slower the heating speed. The resin sintering temperature of Teflon suspension method is higher, which is 370-380℃, while the dispersion method The resin sintering temperature is lower, 360-370℃, and the sintering temperature is high, the shrinkage rate and porosity will increase accordingly, and the sintering time should be properly controlled.
The fourth step: cooling, generally use slow cooling, the speed is 15-25 ℃ hours, in special circumstances, such as a few thin plates with a thickness of less than 5 mm or thin-walled tubes formed by pressing, rapid cooling is used.
Sometimes Teflon products are annealed for 4-6 hours at a temperature of 100-120°C.
Picture 2: ptfe Teflon film source: Shenzhen Dankai
Shenzhen DanKai Technology Co., Ltd. (ShenZhen DanKai Technology Co.,ltd.), whose predecessor was Dongguan Dandi Insulation Material Co., Ltd. Fluoroplastic Material Factory, which was established in 1998, specializes in FEP, PFA, PTFE and other fluoroplastic pipes. An intelligent manufacturing enterprise for the research and development, production, sales and service of rod, sheet and film products and other insulating materials. The company has a senior R&D team with international standards and a production line of fluorine plastic products imported from abroad. Some fluoroplastic products have passed ISO9001, SGS, FDA certification, and have been fully affirmed by domestic and foreign cooperative customers such as Huawei, Foxconn, Midea, ZTE, Intel, and AirTAC. At the same time, we can use imported Japanese Daikin, American Chemours/U.S. DuPont, Russian Halopolymer, Dongyue, and Juhua raw materials to customize and process various specifications of fluoroplastic products.
The main products of the company are: ①Tubes: Ptfe tube, Fep tube, Pfa tube, Pvdf tube; ②Heat shrinkable tube: Ptfe heat shrinkable tube, Fep heat shrinkable tube, Pfa heat shrinkable tube, Pvdf heat shrinkable tube; ③Plate rod Membrane: Ptfe board and rod film, Fep board and rod film, Pfa board and rod film, Pvdf board and rod film; ④Insulation materials: silica gel, PE, PVC, UPE, etc.; ⑤Special category: PFA imported connector, spiral tube, spring tube , Rotary cut tube, welding rod, tee, straight-through, gasket, joint, taper rod, flared tube, sealing tube, braided tube, bellows, etc.
This article is original by Miss Teflon tube, welcome to pay attention, and let you grow knowledge together!
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