There are many kinds of non-woven fabrics, and the production process of each non-woven fabric is:

1. Spunlace non-woven fabric: The spunlace process is to eject a high-pressure fine water stream onto one or more layers of fiber webs, so that the fibers are entangled with each other, and then the web is reinforced to have a certain strength.

(1) Spunlace non-woven process:

A. Fiber material→opening and mixing→combing→crossing*laying→draw→→pre-wet→positive and reverse spunlace→post packing→drying→winding ↑ water treatment cycle

B. Fiber material→opening and mixing→combing the messy net→→pre-wet→positive and reverse spunlace→post packing→drying→winding ↑ The different processing methods of the water treatment cycle affect the vertical and horizontal strength ratio of the final product, the process A has better adjustment of the longitudinal and transverse strength ratio of the fiber web, and is suitable for the production of the spunlaced synthetic leather base fabric; the process B is suitable for the production of the spunlace.

(two), pre-wet

The formed web is fed to a hydrophone to be reinforced, first by pre-humidification.

The purpose of pre-wetting is to compact the loose web and sweep the air in the web so that the web can effectively absorb the energy of the water jet after entering the hydroentangled area to enhance the fiber entanglement.

Common pre-wet methods:

1 double mesh clamping

2 perforated roller and mesh curtain clamp

(three), spunlace

The pre-wet fiber web enters the hydroentangled zone, and the water jet hole of the sprinkler head water spray plate emits a plurality of fine water jets, which are directly directed to the fiber web. The water jet causes a portion of the surface fibers in the web to be displaced, including a straight motion that does not agree with the web. When the water jet penetrates the web, it is rebounded by the curtain or the drum, and is scattered to the fiber in different directions. The discord of the net. Under the dual action of the direct impact of the water jet and the rebound of the water flow, the fibers in the web are displaced, interspersed, entangled, and entangled to form an infinite number of flexible entanglements, and then the web is reinforced.

The direct jetting of the water jet to the web prevents the structure of the web from being destroyed, and the degree of force is favorable for the energy of the water jet, which is then beneficial to the function of the spunlace nonwoven material.

The hydroentangling reinforcement methods mainly include three forms: flat net hydroentanglement reinforcement, drum hydroentanglement reinforcement and hydroentanglement reinforcement combined with drum and flat net.

The woven structure of the net curtain and the appearance of the structure of the web The hydroentangled head is arranged along the circumference of the drum, and the web is adsorbed on the drum to receive the eruption of the water jet ejected by the spunlace. The fiber web is adsorbed on the drum, there is no deviation phenomenon, which is conducive to high-speed production. The fiber web moves in the spunlace area, accepts the spunlace surface to relax, does not tighten, which is beneficial to water jet penetration, effective The fibers are entangled.

The drum is a perforated structure of a metal cylinder, and a dewatering device is provided therein, which has a good rebound effect on the water flow compared with the flat net curtain reinforced by the spunlace.

The combination of the drum and the flat net is strengthened in the spunlace reinforcement process. The combined use of the flat type and the rotary drum type can promote the strengths and avoid weaknesses, and exert their respective advantages. The general level and the second level are the drum-type spunlace, the third stage. For flat net type spunlace. The number of spunlace heads and the hydraulic spunlace reinforcement process are 7~12, the common water pressure is 60~250Bar, the unit area quality of the fiber web, the production speed, etc., the water head pressure is generally set. It is low → high → low.

Structural analysis of water jets According to fluid mechanics, water is ejected from a spray hole and can be called a non-submerged free-flowing turbulent jet. After the water jet is ejected from the water spray hole, the lateral jet of the turbulent jet and the frictional resistance of the air convection jet gradually change from the jet of the bundle to the water droplets that are scattered.

(D), dehydration The purpose of dehydration is to remove the retained water in the fiber network in time, so as not to affect the tangling effect of the next spunlace. When the amount of retained water in the fiber web is large, it will cause the water jet energy to scatter, which is not conducive to fiber entanglement. After the completion of the spunlace process, the moisture in the web is reduced to ******, which is beneficial to reduce the drying energy consumption.

5. Water treatment and circulation

The water used in the spunlace non-woven production process is very large. When the output value reaches 5 tons/day, the water needs to be about 150m3~160m3 per hour. In order to save water and reduce production costs, about 95% of the water must be recycled through water treatment.

Water requirement for spunlace non-woven process <> When the suspended solid content is high, the service life of the filter bag and filter element will be shortened.

Organic matter dissolved or colloidal is easily turbid and produces color. These materials are easily deposited on the walls of the water jet holes and adhere to the fibers, which then affect the whiteness of the product.

The mash group composed of microorganisms will quickly block the water spray hole after being transported by the high-pressure water pump, causing the pressure of the water spur head to rise suddenly, causing parking when it is serious.

Inorganic salts dissolved in water, whether an anion or a cation therebetween, have an effect on the hydroentanglement process. Calcium and magnesium ions produce dust in pipes and equipment, and iron, manganese and copper ions simply produce colored substances. For the production of white sanitary materials, the content should be strictly controlled. When the chlorine ion content is high, the equipment is easily corroded.

A combination of various fibers and a multi-layered fiber is a spunlace nonwoven fabric, but this is not officially called a spunlace nonwoven fabric, and it is called a nonwoven fabric because it is Instead of passing the textile, the textile process was turned into an automatic eruption. Combining the various fibers through the process of eruption enhances the durability of the fabric and then increases the quality of the fabric.

2. Heat-bonded non-woven fabric: Thermally-bonded non-woven fabric refers to the addition of fibrous or powdered hot-melt adhesive reinforcement material to the fiber web, and the fiber web is then reinforced by heating and melting to form a cloth.

Third, pulp airlaid non-woven fabric: airlaid non-woven fabric can also be called dust-free paper, dry papermaking non-woven fabric. It uses the air-laid skill to open the wood pulp fiber board into a single fiber condition, and then uses the airflow method to agglomerate the fiber on the mesh curtain, and the fiber mesh is further reinforced into a cloth.

4. Wet-laid non-woven fabric: The wet-laid non-woven fabric is to open the fibrous material placed in the aqueous medium into a single fiber, and to mix the different fiber materials to form a fiber suspension slurry, and the suspended pulp is transported to the forming mechanism. The fibers are netted in a wet state and then reinforced into a cloth.

5. Spunbond non-woven fabric: Spunbond non-woven fabric is a filament laid after the polymer has been extruded and stretched to form a continuous filament. The filament is then bonded by itself, thermally bonded, and chemically. Bonding or mechanical reinforcement means that the web becomes a non-woven fabric.

6. Meltblown non-woven fabric: The process of melt-blown non-woven fabric: polymer feeding---melt extrusion---fiber composition---fiber cooling---forming into the net---reinforcing into cloth.

7. Needle-punched non-woven fabric: Needle-punched non-woven fabric is a kind of dry-laid non-woven fabric. The needle-punched non-woven fabric is a puncture effect using a lancet, and the loose fiber web is reinforced into a cloth.

Eight, stitching non-woven fabric: stitching non-woven fabric is a kind of dry non-woven fabric, stitching method is the use of warp knitting coil structure on the fiber mesh, yarn layer, non-woven materials (such as plastic sheet, plastic thin The metal foil or the like or a combination thereof is reinforced to form a nonwoven fabric.

Nine, hydrophilic non-woven fabric: mainly used for the production of medical and health materials to achieve a better feel and not scratch the skin. Like sanitary napkins and sanitary gaskets, the hydrophilic function of hydrophilic nonwoven fabrics is used.

For more information about electronic non-woven fabrics, dust-proof and dust-free cloth, waterproof non-woven fabrics of Kunshan Junchuang Electronic Materials Co., Ltd., please contact Xiaobian.