As the base material of composite materials, glass fiber must have its own characteristics. As we said before, glass fiber has the characteristics of higher tensile strength, better elastic modulus and better rigidity than other fiber materials. Many downstream manufacturers also value this, so the strength of glass fiber is also a very important indicator in fiberglass factories.
Many times when faced with changes in the strength of glass fiber, everyone is at a loss. In fact, the change in glass strength is nothing more than two aspects: one is the change in the strength of the glass fiber itself, and the other is the damage caused by post-processing of the original filament.
Changes in the strength of the glass itself:
1. Changes in the composition of glass, such as changes in the content of Al2O3 and alkali metals, will definitely affect changes in the strength of the glass. Changes in the content of other metal ions will also have an impact, but the magnitude of the impact is different.
2. The glass fiber production process also has a great impact on the strength of the glass fiber. The glass fiber production process is a temperature drop process. The temperature drop process is too fast, which has a great impact on the strength of the glass. There are also glass So is the tension in the fiber during winding.
3. Changes in the sizing agent, because the sizing agent mainly changes the physical properties of the glass fiber to make it better for production, so the change of the sizing agent is also a big test for the strength of the glass fiber.
4. Whether the coating of the sizing agent is complete or not. The impact of poor oiling on the strength of the glass is fatal.
5. Changes in spray volume and wet yarn moisture content will also have some impact on the strength of glass fiber. This is mainly affected by the placement time. During the production process of glass fiber, there are more or less partial cracks on the fiber surface. During the process, we use spray and infiltration agent to reduce the temperature. The water adheres to the glass fiber and fills the cracks in the glass fiber. If it is left for a long time, the erosion of the glass cracks will become more and more serious, and the strength of the glass fiber will definitely be affected. .
6. Changes in the drying process, temperature changes, time changes, purely in the over-drying or undrying state, the strength of the glass fiber will definitely be different.
Damage caused by post-processing of raw silk:
To turn glass fiber raw yarn into a finished product, there must be secondary processing, such as twisted yarn, which requires the raw yarn to be twisted, plied yarn to be plied, and direct yarn to undergo the most primitive packaging before it can be turned into a finished product. Therefore, most of the damage caused by post-processing of raw silk is said to be caused by friction damage. Of course, the secondary processing environment may also have an impact, but this is relatively weak.
Analyzing changes in the strength of glass fiber based on a single reason, the change in strength of glass fiber may be limited, but when several factors are added up, the change in strength is no longer as simple as one plus one.
Based on the above direction, I still recommend that you need to do the following tests:
1. Strength data of the finished glass fiber itself (which can determine the strength change of the finished product)
2. Strength data of the raw fiber after drying (it can determine whether it is the drying process or the sizing agent) Change)
3. Strength data of wet yarn (change in strength of glass fiber itself)
4. Friction resistance data of finished product (change in strength of downstream client products)
5. Friction resistance data of raw yarn after drying (secondary Process changes in processing)
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