1 In the modern economic environment, the application fields of FRP products are expanding, and the requirements for FRP products, especially the process requirements, are also increasing. For the mainstream of FRP products, mechanically formed FRP pipes and storage tanks, the requirements for the forming process are more stringent, which makes the process of mechanical forming more precise and more reasonable, so that the products can be reduced under the conditions of the market. Its own manufacturing costs, stable process performance, making it more competitive. According to the previous winding production experience, in the case of a mechanically wound fixed length pipe, the winding length can only be approximately equal to the required length and cannot be exactly equal. In the actual winding process, in order to ensure the length requirement, the residence time is often increased at the end, causing serious accumulation of the end and wasting material. If the residence time is not enough, the winding length cannot meet the requirements. Therefore, it is urgent to study the trajectory problem of the doffing point on the surface of the mandrel. After writing the mathematical formulas, these problems found that the analytical solution could not be obtained by conventional mathematical methods, and the computerized step-by-step simulation method could obtain the approximate solution, and the accuracy can meet the requirements. Therefore, under the condition that the current computer is popularized, the method of step-by-step simulation can be applied to solve the trajectory problem of the doffing point. This paper focuses on the trajectory of the yarn drop point on the wire tip, which is an important part of the analysis of the trajectory of the doffing point on the surface of the mandrel. 2 Trajectory analysis According to the yarn stroke in the actual production process, draw 2, the radius of the opening circle of the wire mouth is ri, the plane where it is located is A1, the center of the circle is 0. The radius of the core mold is r2, the overhanging point D and the core The vertical plane of the die axis is A3, the center of the section is P. The distance from the tip of the wire to the surface of the mandrel is h. The distance from the yarn to the tip of the wire is d. The stable point B of the yarn on the nozzle is from the extended circle of the wire. length. 7 The intersection of the yarn and the yarn comb is A, the plane perpendicular to the plane A1 of the filament nozzle is A2.A in the plane A2, and the projection of A in A1 is CAB is the actual yarn. In the middle, the projection of the doffing point D on the plane A1 is F, the projection of P at A1 is E, E is also the projection of point B on A3, and G is the extension line of D on the PE, which is the extension line of the tangent of point B. One point, BD is the actual yarn. The tension f1 acting on the yarn AB is equal in magnitude to the tension f2 acting on the BD, and the directions are different. F1=f2=f. For the yarn AB: the distance between the core O9 and the midpoint of the tip of the wire is medium, the component of the straight line f3 in the tangential direction of point B is f4: for the yarn BD: f5 at point B The component on the tangent is f6. The tension component perpendicular to the yarn tip at the drop point B on the yarn tip can be balanced by the yarn tip, and the components f4 and f6 on the tangent must be equal in magnitude and opposite in direction. Otherwise B will then slide until the stable point, so that f4 and f6 are balanced. Therefore, the formula (1) is equal to (1), and it can be obtained that K1K3, for the obtained formula (3), cannot be solved by the conventional formula. A step-by-step solution using a computer. Considering the actual representative quantity of S, the value of S is 0CS. (Continued from page 60) Recycled resins were prepared from the extracts produced by decomposition, and the mechanical properties of these resins were investigated to investigate the method of chemical recovery and reuse of thermosetting resins. The main conclusions are: the amine curing agent MDA-cured bisphenol F-type epoxy resin can be completely decomposed by nitric acid to obtain a decomposition product-residue and extract. After the yield of the residue reaches a maximum, it rapidly decreases and then stabilizes. The yield of the extract decreased after reaching a maximum of 60% by weight, but the change was small. The neutralized extract is used to replace part of the resin, mixed with the bisphenol F type epoxy resin, and cured to form a recycled resin. In the case of using the amine curing agent MDA, the strength of the recycled resin decreases with the amount of neutralized extract. This is because the neutralized extract and the resin and curing agent are not completely reacted. When the acid anhydride curing agent PA is used, when the content of the neutralized extract is less than 10% by weight, the strength of the recycled resin is increased with the content of the neutralized extract, and when the content is higher than 10% by weight, the strength is changed. It is very slow. The glass transition temperature (Tg of the recycled resin is higher than that of the original resin and is high with the concentration of the neutralized extract. This is related to the formation of a high-density network structure. Therefore, the thermosetting epoxy resin can be used in the latter type. The method is chemically recycled and reused. (4) The mechanism of decomposition of this epoxy resin in nitric acid solution will be further discussed and studied in future work. Potassium (K) is one of the three essential macronutrients, along with
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Analysis of the trajectory of yarn drop on the yarn nozzle