The designer of the mold structure can choose arbitrarily

Process characteristics For lining tee products, the following points should be emphatically considered: Structural design drawings 1 and 2 show two types of lining products. At present, only FEP resin is used in China. The extruded E1 resin has good processing fluidity and a melt index of 4-12. 


The lining product mainly adopts M3 type that is molding resin, and its melt index is 0. After a few days, cracking and other phenomena gradually appeared, so it cannot be used. Picture 1 Picture 2 Selection of resin materials Generally speaking, melt-processable fluoroplastics (FEP, PFA, PVDF, ETFE, PTFE) are suitable for molding lining products. On the other hand, the product configuration, especially the internal organ configuration, should be adapted to the molding pressure injection molding. 


Therefore, the designer of the mold structure can choose arbitrarily. In comparison, the former has a slightly more complicated mold structure and more troublesome operations such as assembly and disassembly, but the product integrity is slightly better.. The difference is only with no pouring port (Figure i) and with pouring port (Figure 2). On the one hand, the product must have good versatility, BBQ grill mat that is, the relevant structural dimensions and installation dimensions should be as consistent as possible with the relevant standards in the valve. 


The research and investigation of the products of these two structures shows that there is no difference in corrosion resistance and pressure (16MPa).8-2. For smaller village parts, extruded E2 type can also be used, with a melt index of 2 to 4. In some advanced industrial countries, lining parts of these different materials have been developed. It is prone to product cracking (discovered when the mold is removed) or in the molding process.The design of the lining product is the basis for designing the mold. 


The latter has simple mold structure and process operation, but the integrity of the lining product is not as good as the former. According to GB9351, FEP resin is used for molding and extrusion. They complement each other and form a lineup of lining fluorine products with extremely wide adaptability. 


However, due to its relatively low molecular weight, the product has poor resistance to stress cracking. These products have their own advantages in terms of physical and chemical properties, price and cost, processing adaptability and working condition adaptability

The thickness of the coating depends on the coating system used

The processing adopts a proper method to make the micro-powder-like coating particles adhere to the workpiece, and then the coated micro-powder is melted in the oven. The coating material melts with the bonding agent to form a network structure. This mixture is atomized by high-pressure air and sprayed on the surface of the workpiece. 


We use organic solvents to dissolve the grease and heat it to about 400°C to completely volatilize. Sintering Preparation of the workpiece In order to obtain sufficient surface adhesion on the surface of the workpiece, all the grease on the surface to be coated must be removed first. Wet dispersion coating spraying The spray coating material must be uniform.


 The processing steps of dispersion coating are divided into the following steps: 1. The thickness of the coating depends on the coating system used. The bonding ability of the coating with the surface layer of the workpiece can be improved by applying bonding additives and primers. Sintering The step of sintering is to heat the workpiece to a higher temperature until an irreversible reaction occurs. 


The thickness of the coating may vary from a few microns to 200 microns? 0. Dry 4. Dispersion coating The processing method of dispersion coating is to make the coating material uniformly distributed in the solvent to form a dispersion liquid, a kind of wet processing in which solid substances are mixed in the liquid. 2.2 mm? 


Drying The PTFE adhesive tape Manufacturers wet coating is heated in an oven, and the temperature is controlled below 100°C until most of the solvent has evaporated. Wet dispersion coating spraying 3. Preparation of the workpiece 2.html Teflon coating, Teflon coating,. The next step is to clean the workpiece and make the surface rough by mechanical means of sandblasting. 


Using this coating method avoids the use of solvents and subsequent divergence when the coating is attached.Teflon spraying process, how to spray 1. Powder coating The method of powder coating processing is dry processing? The coating material used here is in the form of extremely fine solid particles

Wipe the surface to be adhered with acetone

In F adhesive, select (vinylidene fluoride/perfluoropropylene) copolymer as the main material of the adhesive, and its formula is shown in Table 3. T530 adhesive, the adhesive is a one-component, solvent-based adhesive, suitable for PTFE and PTFE self-bonding or PTFE and stainless steel mutual bonding. Only vinylidene fluoride polymers have a certain degree of solubility. The total time from workpiece processing to bonding to use does not exceed ten minutes, and their shear strength can be as high as 9-16Kg/cm2. 


Table 2 lists the J-2012 adhesive formulation and curing performance. Fluorine-containing adhesives are solvent-based adhesives prepared from vinylidene fluoride polymers, such as domestic F-2, F-5, SG-506, T530 and other brands and fluororesin produced by Raychem in the United States. The first two types of adhesives have better bonding effects, but they take a long time. J-2012 type epoxy resin adhesive[6] J-2012 is a two-component, solvent-free modified epoxy resin adhesive, which can be cured at room temperature or under heating. 


It is not only suitable for fluoroplastics and metals, but also for metals Bonding and repairing with other non-metallic materials. Bonding PTFE and stainless steel with F adhesive can obtain high bonding strength, and has excellent heat resistance and oil resistance.There PTFE BBQ Mats are two main types of adhesives for PTFE bonding: fluorine-free adhesives and fluorine-containing adhesives. This is inconsistent with the fast-paced and high-efficiency in modern production. 


Bonding process: Wipe the surface to be adhered with acetone or ethanol solution, dry, apply T530 glue directly on the surface to be adhered, bond and apply pressure to bond, and it will be adhered firmly in 5-10 minutes. Fluoropolymer F adhesive [7] Because general fluoropolymers do not have melting properties, they cannot melt and flow at high temperatures, and it is difficult to meet the fluidity necessary for adhesives. Fluorine-free adhesives include polyacrylate-based adhesives and epoxy-based adhesives with poor bonding effects, and silicone-based adhesives with better bonding effects, such as domestic F-4S, F-4D, FS-203, CJ-91 and other brands. 


The latter two adhesives are new types of adhesives that have appeared recently. etc.. Here are some excellent adhesives. SG-P-10 adhesive, the adhesive is a two-component, solvent-based adhesive bond composed of primer P-10 and instant super glue SG-506, suitable for fast bonding of PTFE and PTFE workpiece materials Together. They are fast and efficient. Bonding process: wipe the surface to be adhered with acetone or ethanol solution, and dry; brush the surface to be adhered with primer P-10 and dry (3~5min); use super glue SG-506 to quickly bond Connect, 3~8s to stick firmly

  عناوين مطالب پربازدید