Author：Baby & Adult Diaper Materials FROM：Diaper Materials Manufacturer TIME：2022-07-14
At present, non woven fabrics have been widely used in industry, agriculture and medical fields, and also occupy an important position in the development of the national economy. With the development of society, the degree of industrialization of non woven production has been continuously improved, and the hot rolling process is a relatively common technology in non woven production, and the development prospect is very broad. This paper mainly discusses the influence of hot rolling temperature, pressure and speed on the production quality of thermal bond non woven fabric.
The main function of the temperature generated by the roll is to soften and melt a part of the fiber web, and finally consolidate it into a cloth. The melting point of polypropylene is 165 degrees Celsius. When this temperature value is reached, coupled with the action of the roller pressure, the fiber web can reach a molten state. In this part of production, the problem of sticking rolls is common, and the fibers are also prone to embrittlement, and their strength is insufficient. Therefore, in order to avoid these problems, it is necessary to appropriately lower the set temperature to make its value below the melting point of polypropylene. thermal bond non woven fabric products have different gram weights and different thicknesses, so these differences should be fully considered when setting the roll temperature. Thin products have lower temperature requirements, while products with larger thicknesses require more attention. production at high temperatures. If the hot rolling temperature is set too high, the sticking problem will occur, making the hot rolling non woven fabric hard and brittle, and the quality is not up to standard. It can be seen that the setting of suitable hot rolling temperature is a very important issue.
In the application of the hot calender bonding process, the pressure generated by the roll line is used to compact the web. During this process, the fibers generate heat and exert their thermal conductivity. After the polymer melts, it begins to diffuse and flow. In the production process, if the pressure released by the hot rolling line is insufficient, the compaction density of the fiber web will be affected, the bonding point will not be strong enough, and the strength of the non woven fabric will be reduced. If the pressure generated by the hot rolling line is too large, the high polymer on the fiber web cannot be diffused well, and the non woven fabric produced is prone to breakage.
The production of thermal bond non woven fabric with the diversity of people's needs. Therefore, in the production process, it is also necessary to clarify the actual use of the product according to the different needs put forward by users. The hot rolling pressure is reasonably adjusted.
In the production of thermal bond non woven fabric, there is a direct relationship between the hot rolling speed and the time the rolls heat and pressurize the web. Under the condition of a certain temperature, the faster the running speed of the pressure roller line, the less heat will be provided to the fiber web, and the effect of the melting reaction between the fibers will become worse, so that the strength of the produced product will be reduced. will become lower, and the speed at which the roller line runs directly affects the time it takes for the web to pass through the jaw position. In the production of thermal bond non woven fabric, there is a close relationship between the quality of the bonding structure and the heat transfer and melting effect. These two conditions are also a basis for the production of non woven fabrics. In the production process of high density products, it is necessary to pay attention to the adjustment of the production speed, so that the speed is too low to affect the normal production, and the temperature and pressure of the rolls are adjusted to make up for the adverse effect of the speed on thermal bonding.
To sum up, in the application of the hot rolling process, the three factors of roll temperature, pressure and speed will have a great influence on the quality of the final thermal bond non woven fabric produced. Therefore, it is necessary to accurately and appropriately set the actual parameters of the hot rolling process in the production process. There is an interaction relationship between these three factors. In comparison, the temperature of the roll is a more important factor, and the pressure and speed of the roll play a cooperative role. In the actual production process, it is necessary to rely on experience and production results to explore and summarize the best process parameters in terms of roll pressure, speed and temperature, so that the hot rolling mill can operate more well and exert the greatest effect.
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