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1. Definition and Calculation of Yield

Yield refers to the ratio of the number of qualified products to the total number of products produced during the production process, usually expressed as a percentage. It reflects the efficiency and quality control level of the production process, directly affecting production costs and the profitability of the enterprise. The formula for calculating yield is relatively simple, usually calculated by dividing the number of qualified products by the total number of products produced, and then multiplying by 100%. For example, in a certain production cycle, if a total of 1,000 products are produced, of which 900 are qualified, the yield is 90%. A high yield means a low scrap rate, indicating the effectiveness of the enterprise in resource utilization and production management. Conversely, a low yield usually leads to resource waste, increased production costs, and decreased market competitiveness. When formulating production plans, yield, as one of the key indicators, helps management evaluate the performance of the production line and provides a basis for subsequent process improvements.

2. Specific Impacts of Glass Fiber Drawing Process Parameter Optimization on Yield

2.1 Drawing Temperature

During the drawing process, the temperature of the molten glass needs precise control. Temperatures that are too high or too low will affect the formation and quality of the glass fibers. Too high a temperature reduces the viscosity of the molten glass, making fiber breakage more likely; too low a temperature results in poor fluidity of the molten glass, making drawing difficult, and the internal structure of the fibers may be uneven, affecting the yield.

Optimization Measures: Employ advanced heating technologies, such as resistance heating, induction heating, or combustion heating, to achieve higher energy efficiency and temperature uniformity. Simultaneously, strengthen the monitoring and maintenance of the temperature control system to ensure temperature stability.

2.2 Drawing Speed ​​

A stable drawing speed is essentially another way of saying stable output. Any fluctuation in speed will cause changes in the glass fiber diameter, thus affecting performance and reducing output. If the speed is too high, it will produce finer fibers that are insufficiently cooled, resulting in low strength and a high breakage rate; if the speed is too low, it will produce coarser fibers, which will not only reduce production efficiency but may also cause problems in subsequent processing steps.

Optimization Measures: Automation of the drawing machine, such as an automatic roll-changing drawing machine, can minimize time losses caused by roll changes, stabilize the drawing speed, and thus increase output. Precise control of the drawing speed can also ensure fiber strength and high production efficiency.

2.3 Spinneret Parameters

The number of orifices, orifice diameter, orifice diameter distribution, and temperature of the spinneret. For example, if the number of orifices is too high or too low, it will lead to uneven glass melt flow, and the fiber diameter may be inconsistent. If the spinneret temperature is uneven, the cooling rate of the glass melt during the drawing process will be inconsistent, thus affecting fiber formation and performance. Optimization measures: By designing a suitable spinneret structure, using an eccentric platinum furnace, or varying the nozzle diameter in a gradient manner, the fluctuation of fiber diameter can be reduced, the yield can be improved, and thus a stable fiber drawing operation can be achieved.

2.4 Oiling & Sizing Agent 

The quality of the oil and sizing agent – and how evenly they’re applied – really matter for how easy the fibers are to process and what your final yield looks like. If the oil isn’t spread evenly or the sizing agent isn’t up to par, the fibers might stick together or snap during later steps. 

Optimization measures: Pick the right oil and sizing formulas, and fine-tune how they’re applied so everything gets a smooth, even coat. Also, keep your oiling and sizing systems well-maintained so they keep running like they should.