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Why is it said that the processing of polytetrafluoroethylene custom parts differs from that of common polytetrafluoroethylene parts?

2019-07-26View Original

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Are polytetrafluoroethylene custom parts different from common polytetrafluoroethylene parts? Common polytetrafluoroethylene products include polytetrafluoroethylene rods, pipes, and sheets. Both the molding and extrusion processes for polytetrafluoroethylene involve linear motion, and the powder does not flow; therefore, it is possible to design molds specific to the custom-shaped parts that need to be manufactured. However, many custom-shaped polytetrafluoroethylene parts cannot be directly molded into finished products – instead, they must first be turned into standard polytetrafluoroethylene components or semi-finished products that can be molded in one step. Continuous efforts are being made to develop new applications for polytetrafluoroethylene, taking advantage of its outstanding properties such as resistance to high temperatures and low temperatures, resistance to corrosion from almost all organic solvents and chemicals, excellent electrical insulation properties, a very low coefficient of friction, and non-stick characteristics. These properties enable its widespread use in various fields such as chemistry, aviation, pharmaceuticals, electronics, and construction. Polytetrafluoroethylene is a thermoplastic resin that, even when exposed to temperatures above its melting point of 327°C or even its high-temperature decomposition temperature of 380°C, only softens rather than melting. This results in very poor fluidity of the resin, which in turn limits the possibilities for processing it into products. Are polytetrafluoroethylene custom parts different from common polytetrafluoroethylene parts? Common polytetrafluoroethylene products include polytetrafluoroethylene rods, pipes, and sheets. Both the molding and extrusion processes for polytetrafluoroethylene involve linear motion, and the powder does not flow; therefore, it is possible to design molds specifically for the custom-shaped parts that need to be manufactured. However, many custom-shaped polytetrafluoroethylene parts cannot be directly molded into finished products – instead, they must first be turned into standard polytetrafluoroethylene components or semi-finished products that can be molded in one step. Due to the high cost of polytetrafluoroethylene, it is necessary to find alternative methods to develop polytetrafluoroethylene products in various shapes and sizes, in order to save materials. In the design of PTFE custom parts, with the aim of reducing losses, ensuring a uniform density of PTFE within the product is a key factor that must be taken into account during the design process. Due to the non-fluidity of perfluoropolymer resin, it is only by ensuring uniform filling of the powder in the mold that a consistent density can be maintained under pressure. For square, circular, or other straight-shaped tubes that can be molded directly, they can be produced in one go without the need to first create plates or rods that must then be cut into the desired shapes. Items such as bushings, corner pieces, and washers fall into this category; generally, it is easy to design molds and carry out the processing for such products. As shown in the figure below, all that is required is a good understanding of the manufacturing process and its key aspects.......................duolingptfe

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