When discussing the production process of spunlace nonwovens, we have to understand the process of spunlace in detail. The process involves not only the precise injection of high-pressure microstreams, but also the entanglement of the web under the impact force and the strong support of the resulting web. These links together constitute the complete process of spunlace technology, and also determine the unique properties of spunlace non-woven fabric.
Common spunlaced process processes include preparation of fiber raw materials, opening and mixing, carding into nets, pre-wet treatment, positive and negative spunning (to ensure strict water treatment cycle), post-finishing, drying and winding. Among them, pre-wetting and spilling are the key steps in the process flow and have a crucial impact on the performance of the final product. Next, we will delve into the details of these two processes.
In the common spunky process flow, pre-wetting and spunky are indispensable key links. The purpose of the pre-wetting treatment is to provide the appropriate humidity for the fibers to prepare for the subsequent spilling process. Spines, on the other hand, impact the fiber network through high pressure water flow to make it tightly combined and improve the physical properties of the product. The fine control of these two processes has a decisive impact on the quality of the final product.
The formed mesh is sent to the spinger for reinforcement, the first step of which is pre-humidification. The purpose of this process is to compact the loose mesh and expel the air from it, ensuring that the mesh can efficiently absorb the energy of the water jet once it enters the spool region, thereby enhancing the entanglement between the fibers.
The prewetting method of double mesh clamping can effectively reduce the unexpected displacement of fibers in the fiber mesh during prewetting, and compact compress the input prewetting area of the fluffy fiber mesh. This method not only has excellent control effect of fiber mesh and high quality of pre-wetting, but also is very suitable for high-speed production lines above 200m/min.
Spunling process, as a key step in the reinforcement of the fiber network, further strengthens the entanglement between the fibers through the action of high-pressure water jets, thereby improving the overall strength and stability of the product. This process not only plays a vital role in the field of nonwovens, but also is widely used in many other industries, making important contributions to the quality improvement and performance optimization of products.
Spunky reinforcement technology is the key link of fiber network reinforcement, which mainly includes three ways: flat spunky, hub spunky and composite spunky. In the automobile industry, spin hub spinger technology has been widely used.
The technology of spin hub spinger reinforcement has unique advantages. In this process, the water tip is evenly arranged along the circumference of the rotating hub, and the fiber net is close to the surface of the rotating drum, which avoids the phenomenon of deviation and is very suitable for high-speed production needs. At the same time, under the action of hub rotation, the fiber network moves curved in the spool area, which makes one side of the fiber network relax and the other side compress when accepting spool, thus optimizing the penetration effect of water jet. When the water jet penetrates the fiber network, it will be bounced by the hub and scattered to the opposite side of the fiber network at different angles. This dual action leads to the displacement, interpenetration, entanglement and hugging of the fibers in the fiber network, forming a large number of flexible entanglement nodes, and then realizing the firm reinforcement of the fiber network. In addition, the process can also be used in the limited space of the fiber network for several times of positive and negative spurring treatment.
The hub is usually a metal cylinder punch structure and is equipped with a dewatering device. The function of the dewatering device is to remove the retained water in the fiber network in time to ensure the subsequent reinforcement effect of spines. If the water retention is too much, it will affect the energy concentration of the water jet, which is not conducive to the entanglement of the fiber. Therefore, reducing the moisture in the fiber mesh to a minimum after the spunling process not only helps to improve product quality, but also reduces the drying energy consumption.
The selection of the number of water spikes and the control of water pressure are very important in the process of spill reinforcement. In general, the number of commonly used water spines is 712, and the water pressure range is 60250Bar. The specific setting should be comprehensively considered according to the factors such as the mass per unit area of the fiber network and the production speed, and the pressure distribution strategy of low → high → low is usually adopted.
The above is a detailed introduction to the spunlaced non-woven fabric process. It is hoped that this information will help you gain a deeper understanding of this critical process. At the same time, we also look forward to discussing the process improvement and innovation of automotive raw materials with more peers.