Bag sewing machine base (http://www.liyujn.com/) Development and application of an Introduction 
 Microwave frequency is about 300 MHz ~ 300 GHz, the wavelength of 100 cm to 1 mm in the range of the electromagnetic wave, it is a very special electromagnetic spectrum. Microwave chemistry is the use of modern microwave technology to study the material under the action of the microwave field in the physical and chemical behavior of a science. Is a new interdisciplinary frontier. Microwave technology can be increased molecular motion. Increase the average molecular energy, reduce the activation energy, so the field is mainly used to improve the chemical reaction rate, and even change the chemical reaction mechanism. Start a new reaction channels; for some reactants are polar. The product of a non-polar or weakly polar reaction is reversible. Microwave heating while improving yield. Since the efficiency of microwave organic synthesis, organic chemistry has greatly stimulated research workers enthusiasm for microwave organic synthesis. 
 In order to meet the needs of workers in organic synthesis, microwave synthesis of a variety of professional instrument continuously available, the main representative of the Discover America Peian based company focused single-mode microwave synthesizer; Swedish production Initiator/Initiator6 Microwave Synthesis instrument. Shanghai Xin Yi domestic microwave chemical technology company's MAS-1-type atmospheric pressure microwave synthesis instrument and Technology, Nanjing Jiang Ling produced LMMC a 201 atmospheric pressure microwave synthesis instrument. The microwave synthesizer performance is good, but expensive, often imported parts in the 5 to 6 million yuan, domestic parts in 2 to 3 million yuan. As the research needs, we use to transform the domestic microwave oven developed a "microwave synthesis instrument, the instrument after two years of application, found the overall design is feasible, but the biggest problem is fixed in the microwave reaction flask iron clamp on the wall . 
 After a period of microwave radiation, generated in the process due to iron clamp with a small amount of iron oxide material, and iron oxide are low microwave dielectric loss. To surface charge accumulation, and because of grain boundary defects, tied a lot of space charge, making the iron clamp of the temperature. Or even discharge, seriously affecting the normal use of the device. Through research. We design with excellent insulation. Microwave penetration strong, good self-lubricating, corrosion resistant to various chemicals, high temperature PTFE plastic Ht as the basic material, machining method using PTFE spiral Cutting and sewing machine first. Microwave synthesizer as the reaction flask supporting frames. The PTFE Spiral Cutting and sewing machine has a simple structure, safe to use. Adjust freely and to form a variety of highly different experimental Cutting and sewing machine. To meet in the microwave synthesizer installed in a variety of different models of the size of the reaction flask needs. Ensure the normal use of the microwave synthesizer. 
 2 Experimental 
 2.1 Instruments and Accessories 
 C616 type lathe. Jinan First Machine Tool Plant; Microwave Synthesizer U.S. 700 W domestic microwave oven by the restructuring; electronic digital calipers (0 ~ 150 mm), Guilin Guanglu digital detection Co.; SXHW electronic energy-saving digital temperature thermometer . Zhengzhou Great Wall Industry Corporation; WCT-2C microcomputer differential thermal balance, Beijing Optical Instrument Factory. Accessories include: YT15-type flat knife, knife external thread, internal thread cutter, boring tools and cutter. Are purchased parts. 
 3 Results and discussion 
 3.1 PTFE Spiral Cutting and sewing machine assembly 
 The A-type spiral, that is, height h = 30 mm threaded tube followed by the three groups combined, you can assemble the A-type PTFE spiral Cutting and sewing machine. The Cutting and sewing machine is the minimum height the height of A-type coil 30 mm. Maximum height will be less than 30 mm × 3 mm, the minimum height and maximum height in between can be adjusted with ease. Similarly, the B-type spiral can be assembled out of B-type PTFE spiral Cutting and sewing machine. As the A-and B-type coil made of the common parts, so A-and B-type coil assembly can also be mixed into other high PTFE spiral Cutting and sewing machine. So A-and B-type spiral coil design science, which could be assembled. Flexible use, this is the other Cutting and sewing machine are not available. In addition. Cutting and sewing machine we designed tubular, the inner diameter of the threaded tube 24 mm, round bottom glass reaction flask can securely and safely stand on the spiral Cutting and sewing machine, and the glass surface reaction force by bottle four weeks large. The force is uniform, will not damage the glass reaction flask. As a self-lubricating PTFE, Teflon spiral Cutting and sewing machine and therefore in the course of oil and can also rotate freely without special effects. 
 3.2 PTFE Spiral Cutting and sewing machine performance testing 
 We assembled A-and B-type PTFE spiral Cutting and sewing machine used in the home-made microwave synthesizer, and performance testing. Good condition, the power of microwave radiation response of different bottles. Heating at different times, PTFE Spiral Cutting and sewing machine at room temperature of 10 ℃ is always consistent and that is not heat. Is PTFE spiral Cutting and sewing machine does not absorb microwaves. Microwave loss can be almost through. Can be seen from the table. PTFE Spiral Cutting and sewing machine no ignition occurred. PTFE Spiral Cutting and sewing machine shows no charge accumulation. In addition, we use computer WCT-2C type differential thermal balance made PTFE heat resistance test. Found at 324 ℃ PTFE materials have a smaller weight loss peak, suggesting that the PTFE material used in the 324 ℃ the following are safe. We can see from the data in Table l, Teflon spiral Cutting and sewing machine in the process of microwave radiation does not heat up the experiment, we found that reaction bottle of water within 2 ~ 3 min in boiling already, that PTFE spiral Cutting and sewing machine safety and reliability. 
 3.3 PTFE Spiral Cutting and sewing machine applications 
 Developed Type A and Type B PTFE spiral Cutting and sewing machine used in the microwave synthesis instrument made for the synthesis of 1-naphthaleneacetic acid methyl ester, after two months of intermittent use, in normal operation, no abnormal phenomenon. 
 4 Conclusion 
 (1) PTFE Spiral Cutting and sewing machine simple structure. Design, the experiment is different from the ordinary scissors Cutting and sewing machine, and also different types of industrial hydraulic Cutting and sewing machine, with original spiral tubular type of innovation. 
 (2) Spiral Cutting and sewing machine selection science. This special electromagnetic microwave grasp the characteristics of excellent insulation choice, microwave penetration. Good corrosion resistance, high temperature PTFE as substrate, suitable for use in harsh conditions.