Room-temperature PTFE filter felt in non-woven production equipment: How to accurately control the heat setting process?

Heat setting is one of the core processes of the room-temperature PTFE filter felt production line in non-woven production equipment. This process precisely controls the heating temperature and duration to treat the pre-pretreated plain felt at high temperature to achieve the desired setting effect. This process not only makes the fibers more tightly bonded and enhances the overall strength of the material, but more importantly, it ensures that the filter felt can maintain a stable shape and size during subsequent use and processing.

However, it is not easy to control the heat setting process. Excessive temperature or too long time may cause excessive shrinkage of the fibers, thereby affecting the flexibility and air permeability of the material. The decrease in flexibility means that the filter felt is prone to deformation when subjected to external forces, which in turn affects its filtration efficiency and service life; while the decrease in air permeability may lead to an increase in filtration resistance, which increases the energy consumption when air or fluid passes through the filter felt. On the other hand, if the temperature is insufficient or the time is too short, the expected setting effect may not be achieved, making the filter felt prone to changes in shape and size during subsequent processing and use, thus affecting its overall performance and stability.

In order to achieve precise control of the heat setting process, the normal temperature PTFE filter felt production line in the non-woven fabric production equipment is usually equipped with advanced temperature control equipment and precise timing devices. The application of these devices ensures that each batch of filter felt can achieve the best setting effect.

Temperature control equipment is a key component in the heat setting process. It can monitor and adjust the temperature in the heating chamber in real time to ensure that the temperature is always kept within the preset range. These devices usually use advanced sensors and control systems to achieve rapid response and precise adjustment of temperature. For example, some high-end non-woven fabric production equipment uses a PID (proportional-integral-differential) temperature control system, which can automatically adjust the heating power according to the deviation between the actual temperature in the heating chamber and the preset temperature, thereby achieving precise control of the temperature.

At the same time, precise timing devices are also an indispensable part of the heat setting process. It can accurately record the time of the heating process to ensure that each batch of filter felt can complete the setting process within the specified time. These timing devices usually adopt electronic or mechanical designs with high precision and stability, which can achieve precise control and recording of time. In some advanced non-woven fabric production equipment, the timing device is also combined with the temperature control device to form an intelligent control system. The system can automatically adjust the heating temperature and duration according to the preset process parameters, thereby realizing the full automation control of the heat setting process.

Although advanced temperature control equipment and precise timing devices provide a strong guarantee for the precise control of the heat setting process, in practical applications, it is still necessary to pay attention to some factors that may affect the setting effect and adopt corresponding optimization strategies.

The type and characteristics of the fiber are one of the important factors affecting the heat setting effect. Different types of fibers have different thermal shrinkage rates and melting points, so it is necessary to select the appropriate heating temperature and duration according to the characteristics of the fiber. For example, for PTFE fiber, due to its high melting point and good thermal stability, a higher heating temperature and a longer duration can be selected for heat setting. For some fibers with a large heat shrinkage rate, it is necessary to appropriately reduce the heating temperature and shorten the duration to avoid performance degradation caused by excessive fiber shrinkage.

The thickness and density of the filter felt are also key factors affecting the heat setting effect. Thicker filter felts require longer heating time and higher temperatures to ensure that the internal fibers are fully set; while denser filter felts require higher temperatures to penetrate the fiber layer and achieve the desired setting effect. Therefore, in actual production, the heating temperature and duration need to be adjusted according to the thickness and density of the filter felt to ensure that each batch of filter felt can achieve the best setting effect.

The design and material selection of the heating cavity also have an important impact on the heat setting effect. The heating cavity needs to have good thermal insulation performance and uniform heating ability to ensure uniform and stable temperature distribution during the heating process. The material of the heating cavity also needs to have sufficient high temperature resistance and corrosion resistance to ensure long-term stable operation. In order to meet these requirements, some advanced non-woven fabric production equipment uses multi-layer insulation structure and high-temperature alloy materials to manufacture the heating cavity, thereby improving the heat setting effect and the durability of the equipment.