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Excellent Carding Effect Creates High-quality Industrial Felt

Views: 62     Author: Site Editor     Publish Time: 2020-12-22      Origin: Site

Industrial felt may look just like ordinary fabrics, but they perform much better. It has recently become a key conveyor part in extrusion line for being durable, heat resistant, and hard-wearing. However, high-quality industrial felts can not be achieved without carding. Let's take a look!

Carding machine

The function of this machine is to open and comb heat resistant fibers to remove impurities. And the curled or lumpy fiber mass will become a state of a straight single fiber. At the same time, it also can remove the short lint with impurities left in the ginning process. Finally, it will pass the combed fibers to the next stage to process into felts.

The process of carding Kevlar fiber

1. Feeding

To a large extent, the grip of the feeding part has a lot to do with the carding effect of the licker-in roller. A proper holding force allows a better grip on the fiber for carding. Otherwise, it will cause uneven lateral carding of the roller. As a result, a poor grip can lead to poor quality of the felt layer, and the fiber cannot be fully combed.

2. Licker-in/Taker-in

The main role of the licker-in roller is to remove impurities and short lint in the fiber. Its combing quality directly affects the carding quality of the cylinder. And it is also closely related to the uniformity of the felt, the degree of fiber damage, and so on. In addition, many factors affect the combing effect, such as licker-in specifications and speed, feeding technology, combing board craft, etc.

The licker-in area can remove 50-60% of the impurities in the feeding fiber. And the rest residues enter into the flat strips or fall out in other stages. Actually, modern carding efficiency is about 80-90%. And the removal efficiency can reach 95-99% by combining the opening and cleaning process with the carding machine. Therefore, the final impurity content is only 0.05-0.3%.

The forming of Kevlar layers

3. Cylinder, flats, and doffer

After the initial combing of licker-in, the filament and dust in the fiber are easier to be taken away. The reason is that they have more contact area with cylinder needle teeth. But fine impurities and short lint often stay, even pressed into the flats to form flat strips. Thus, detailed carding between the flats is particularly important for further removal. Finally, doffer presses the carded fibers into fiber layers. This allows well mixing of fiber in carding and merging process.

4. Stripping

The purpose of stripping device is to peel off the fiber layers condensed on the doffer surface into a fiber web. The fibers that remain on the surface of the cylinder will return to the plats. Then the needle teeth will repeatedly comb to completes the longitudinal blending of fibers. And to carry out the fiber blending along the transverse direction while forming the web.

The above mentioned are the main processes of carding fibers. Such advanced equipment is the basis for our ability to produce high quality felts. It also ensures our heat-resistant felts are pure without any impurity, giving our products long service life. If you want to know more or inquire about Calm-brand felt products, please feel free to contact us at toby@gdcalm.com. We are very pleased to receive your message!

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