What is the difference between spunbond and meltblown?

With the widespread use of meltblown fabric making machine and spunbond fabric making machine, meltblown fabric and spunbond fabric have come to play an important role. But what exactly is the difference between them? Below, we will explore together.

1. In addition to the melt entering the spinning chamber, the hot draft air stream also enters the spinning chamber and is ejected together from the spinning assembly. The production site is hotter and the draft air stream is noisier.

2. On the collection device relying on the residual heat of the fibers’ self-solidification into meltblown fabric, generally does not need other solidification equipment (such as a hot rolling mill, etc.), and the main equipment configuration is relatively simple.

3. The meltblown process has many forms of collection devices, while the spunbond method can generally only be received with a mesh belt. In some meltblown systems, the receiving device does not even need to become a net fan.

4. Cooling devices for the meltblown method are not necessary. However, in the case of cooling devices, some product properties are improved. In contrast, the spunbond method must be equipped with a cooling device.

5. The fiber diameter of meltblown nonwovens is disordered and varied, and is distributed in a certain pattern. Is the same fiber, and the diameter of its various places is not equal, but the average diameter is much smaller than spunbond, and the structure is dense. The diameter of the fibers of spunbonded non-woven fabric is uniform and consistent, and the structure of the fiber network is loose.

6. The fiber diameter of meltblown nonwovens is distributed between 2 and 10 µm so that the draft speed required can be at the speed of sound or higher (340-500 m/s). The drafting speed of the spunbond process is generally only 40 to 100m/s. 7.

7. Meltblown nonwovens rely on residual heat for self-bonding between fibers. As a result, the strength of meltblown fabrics is much lower than that of spunbonded fabrics, and the elongation at break is also lower, and they are not abrasion-resistant and not used independently.

8. Meltblown process used in the spinneret for a single row of holes, each meter width of the number of holes only 1380 ~ 1960, in operation can not have any spinneret hole blockage phenomenon, the use of a shorter cycle. The number of holes in the spunbond process is 5,000 to 7,000, which allows the blockage of some spinnerets during operation. Therefore, under the same conditions of single-hole flow, the output of meltblown cloth is less than 1/3 of the same width of spunbond, and the current average output per meter width is only about 50kg/hour.

9. The quality of the meltblown fabric is related to the size of the distance between the spinneret and the receiving device (receiving distance DCD), which determines the characteristics of the product and its application (field of use), a very important process parameter in the production of meltblown fabric. The spunbond process does not necessarily require adjustment of the receiving distance, which generally only affects the uniformity of the spunbond fabric.

10. The meltblown process has a lower yield due to the use of hot air drawing and the raw material price is higher than the spunbond process. Therefore, the energy consumption per unit of production will be 2 to 4 times more than the spunbond method, and the production costs are higher.

11. There are two applications for meltblown technology, one is to produce meltblown fabrics in the form of a stand-alone meltblown line. The other is as a system in a multi-spinning system composite line, forming a production line in the form of SMS, SMMS, etc. to produce composite nonwoven products.

 

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Post time: Nov-30-2022

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