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Non-woven fabrics' production principle

Views: 5     Author: Site Editor     Publish Time: 2022-10-26      Origin: Site

The most important link of non-woven fabric is summarized in four words: forming mesh and strengthening. Therefore, this paper briefly introduces several of the most common mesh forming and reinforcement methods.

Production principle of non-woven fabrics

1. Cotton is mainly combed into mesh

Similar to the carding principle in spinning, the differences between carding and netting are as follows

(1) The generation of nonwoven carding process --- the arrangement and orientation of fibers in the fiber mesh requires "clutter technology" and "condensation technology" to achieve the isotropic characteristics of nonwoven materials

(2) The fiber web of nonwoven materials has high unit area density (g/m2) and thickness (mm), so some fiber webs from the carding machine need to be laid and overlapped

Principle of combing into a net

Carding is the key process of web forming. The small cotton bundles that are opened, mixed and prepared are combed into a thin web composed of single fibers for laying and stacking, or directly reinforcing, or weaving a web with fibers arranged in disorder through air flow.

The equipment used for carding can be either "roller type" carding machine or "cover type" carding machine.

The fibers in the fiber web directly output by the doffer of the carding machine are arranged in a longitudinal parallel manner, with good directivity; The fibers are arranged in two dimensions after being combed or cross laid by "clutter roller" and "condensation roller":

After the air flow is formed, the fibers are arranged in three dimensions with good non orientation.

2. The reinforcement methods are mainly acupuncture and spunlace

(1) Principle of acupuncture reinforcement technologyNon-woven fabric with activated carbon manufacturers - Jiatecairfilter

Use the needle with barb on the edge of triangular section (or other sections) to puncture the fiber mesh repeatedly. When the barb passes through the fiber mesh, the surface and local inner fibers of the fiber mesh are forced to penetrate into the fiber mesh. Due to the friction between fibers, the original bulky fiber mesh is compressed. When the needle pushes out the fiber mesh, the inserted fiber bundles leave the barbed surface and remain in the fiber mesh. In this way, many fiber bundles entangle the fiber mesh so that it can no longer return to its original fluffy state. After many times of acupuncture, a considerable number of fiber bundles are penetrated into the fiber mesh to form a "three-dimensional structure", which makes the fibers in the fiber mesh intertwine with each other, thus forming a needle punched nonwoven material with a certain strength and thickness.

(2) Technological principle of spunlace reinforcement

The principle of reinforcing the fiber mesh with spunlace method is similar to that of the needling process, but instead of needling, multiple micro water jets generated by high pressure are used to jet the fiber mesh. After the water jet passes through the fiber mesh, it is entrusted to hold the rebound of the net curtain and insert the fiber mesh again. Therefore, under the hydraulic action of high-speed water jet in different directions, the fibers in the fiber mesh will have displacement, interpenetration, entanglement and cohesion, so as to strengthen the fiber mesh.

3. Spunbonded method

Traditional textile process:

Qinghua → carding → drawing → roving → spinning → winding → warping → sizing → reeding → weaving → cloth

General nonwoven process flow:

Fiber raw material → netting → reinforcement → nonwovens

The nonwovens process using chemical fibers as raw materials can also be shrunk, that is, polymer → mesh → reinforcement → nonwovens, which is the spunlaid process and melt blowing process nonwovens technology.

In terms of high polymer reinforcement technology, in addition to the traditional acupuncture and spunlace methods, there is also a hot rolling method.

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