Nonwovens, also known as nonwovens, are constructed from oriented or random fibers. It is called a cloth because it has the appearance and some properties of the cloth.
First, the characteristics of non-woven fabrics ：The non-woven fabric has no latitude and longitude lines, and it is very convenient to cut and sew, and it is light and easy to shape. Nonwoven fabric breaks through the traditional textile principle, and has the characteristics of short process flow, fast production rate, high output, low cost, wide application and many sources of raw materials.
It is less strong and durable than woven fabrics and cannot be washed like other fabrics. Since the fibers are arranged in a certain direction, they are easily cleaved from a right angle direction, and the like, and therefore the improvement of the production method is mainly to prevent the improvement of the split.
Second, the classification of non-woven fabrics，According to the different production processes are divided into:
(1) Spunlaced nonwoven fabric
The high-pressure fine water stream is sprayed onto one or more layers of the fiber web to entangle the fibers with each other, so that the fiber web can be reinforced and has a certain strength.
Features: 1. Flexible entanglement, does not affect the original characteristics of the fiber, does not damage the fiber. 2. The appearance is closer to traditional textiles. 3. High strength and low fluffing. 4. High hygroscopicity, fast moisture absorption. 5. Feel soft and drape. 6. The appearance of the pattern is changeable. 7. The production process is long and the floor space is large. 8. The equipment is complex, energy consumption is high, and water quality requirements are high.
Product application: medical curtain, surgical gown, surgical cover cloth, medical dressing material, wound dressing, medical gauze, aviation rag, clothing lining fabric, coated base fabric, electronic industry advanced rag, cotton pad, wipes, mask covering Materials, etc.
(2) Heat sealing nonwoven
It refers to adding fibrous or powdery hot-melt bonding reinforcement material to the fiber web, and the fiber web is further fused and cooled to form a cloth.
Features: The surface of the bonded hot-rolled surface is relatively smooth, and the point-bonded hot rolling is relatively fluffy.
Product application: production of baby diapers and women's sanitary napkin covering materials, ointment base fabric, clothing lining, masks and so on.
(3) Pulp airlaid non-woven fabric
Also known as dust-free paper, dry papermaking non-woven fabrics. It uses the air-laid technology to open the wood pulp fiber board into a single fiber state, and then uses a gas flow method to agglomerate the fibers on the mesh curtain, and the fiber web is further reinforced into a cloth.
Features: good fluffiness, soft handfeel and super absorbent.
Product application: medical hygienic materials, especially high-absorbency disposable hygiene products (such as diapers, sanitary napkins, wet wipes, wipes, etc.).
(4) Wet non-woven fabric
The fiber raw material placed in the water medium is opened into a single fiber, and at the same time, different fiber raw materials are mixed to form a fiber suspension slurry, and the suspended pulp is transported to a web forming mechanism, and the fiber is meshed in a wet state and then reinforced into a cloth.
Features: 1. High production speed, up to 400m / min. 2. Can make full use of short fibers. 3. The product fiber network has good uniformity. 4. Large water consumption and high one-time investment.
Product application: 1. Special paper: dust / liquid filter paper, tea bags. 2. Industrial: filter, insulation material, sound absorbing material. 3. Medical use: medical backing, medical tape, surgical bag wrapping materials. 4. Civil use: wallpaper, etc.
(5) Spunbond nonwoven
After the polymer has been extruded and stretched to form continuous filaments, the filaments are laid into a web, and the web is then subjected to self-bonding, thermal bonding, chemical bonding or mechanical reinforcement to make the web into no Woven cloth.
Features: 1. The web consists of continuous filaments. 2. Excellent tensile strength. 3. There are many process changes, which can be reinforced by various methods. 4. The filament has a wide range of fineness.
Product application: 1. Polypropylene (PP): geotextile, tufted carpet base fabric, coated base fabric, medical materials, coated materials for disposable products. 2. Polyester (PET): filter material, lining material, tufted carpet base fabric, agricultural materials, packaging materials, etc.
(6) Meltblown nonwoven fabric
The process of melt-blown non-woven fabric: polymer feeding---melt extrusion---fiber formation---fiber cooling---forming into the net---reinforcing into cloth.
Features: 1. The web consists of very thin, short fibers. 2. The fiber has good uniformity and soft handfeel. 3. Good filtration performance and liquid absorption performance. 4. The strength of the fiber web is poor.
Product application: filter materials, medical and health materials, clothing materials, battery separator materials, wiping materials.
(7) Needle-punched nonwoven fabric
It is a kind of dry non-woven fabric. The needle-punched non-woven fabric is a puncture effect of a lancet, and the fluffy fiber web is reinforced into a cloth.
Features: 1. Flexible entanglement between fibers, with good dimensional stability and elasticity. 2. Good permeability and filtration performance. 3. Feel rich and fluffy. 4. Various collection patterns or three-dimensional molded products can be manufactured according to requirements.