The origin and development of needle punched non-woven fabrics

Needle punched non-woven fabric

Needle punched non-woven fabric is a type of dry process non-woven fabric, which involves loosening, combing, and laying short fibers into a fiber mesh. Then, the fiber mesh is reinforced into a fabric through a needle. The needle has a hook, which repeatedly punctures the fiber mesh and reinforces it with the hook, forming a needle punched non-woven fabric. Non woven fabric has no distinction between warp and weft lines, and the fibers in the fabric are messy, with little difference in warp and weft performance.

The common production process for needle punched non-woven fabrics is screen printing. Some holes in the screen printing plate can pass through the ink and leak onto the substrate. The remaining parts of the screen on the printing plate are blocked and cannot pass through the ink, forming a blank on the substrate. With a silk screen as the support, the silk screen is tightened on the frame, and then photosensitive adhesive is applied on the screen to form a photosensitive plate film. Then, the positive and negative image bottom plates are glued onto a non-woven fabric for sun drying, and exposed. Development: The non ink parts on the printing plate are exposed to light to form a cured film, which seals the mesh and prevents ink transmission during printing. The mesh of the ink parts on the printing plate is not closed, and ink passes through during printing, forming black marks on the substrate.

The development of needle punched non-woven fabrics

The concept of needle punched non-woven fabric comes from the United States. As early as 1942, the United States produced a new type of fabric like product that was completely different from textile principles, because it was not made by spinning or weaving, it was called non-woven fabric. The concept of needle punched non-woven fabric has continued to this day and has been adopted by countries around the world. Let’s follow the editor to learn about the origin and development of needle punched non-woven fabrics.

In 1988, at the International Nonwoven Fabric Symposium held in Shanghai, Mr. Massenaux, Secretary General of the European Nonwoven Fabric Association, defined non-woven fabric as a fabric like material made from directional or disorderly fiber webs. It is a fiber product made by applying frictional force between fibers, or its own adhesive force, or the adhesive force of an external adhesive, or combining two or more forces, that is, by friction reinforcement, bonding reinforcement, or bonding reinforcement methods. According to this definition, non-woven fabrics do not include paper, woven fabrics, and knitted fabrics. The definition of non-woven fabric in the Chinese national standard GB/T5709-1997 “Terminology for Textiles and Non woven Fabrics” is: oriented or randomly arranged fibers, sheet like fabrics, fiber webs or mats made by friction, bonding, or a combination of these methods, excluding paper, woven fabrics, knitted fabrics, tufted fabrics, continuous woven fabrics with entangled yarns, and wet shrink felt products. The fibers used can be natural fibers or chemical fibers, which can be short fibers, long filaments, or fiber like substances formed on the spot. This definition clearly stipulates that tufted products, yarn knitted products, and felt products are different from non-woven fabric products.

How to clean needle punched non-woven fabrics

Choose a neutral detergent with a pure wool logo and no bleach for cleaning, hand wash separately, and do not use a washing machine to avoid damaging the appearance.
When cleaning needle punched non-woven fabrics, use gentle hand pressure, and even the dirty parts only need to be gently rubbed. Do not use a brush to scrub. Using shampoo and silk conditioner to clean needle punched non-woven fabrics can reduce the phenomenon of pilling. After cleaning, hang it in a ventilated area and let it dry naturally. If drying is required, please use low-temperature drying.

The insulation cycle of needle punched nonwoven fabric

Greenhouse growers are not unfamiliar with insulation. As long as the weather turns cold, they will be put into use. Compared with traditional insulation materials, insulation quilt covers have the advantages of small heat transfer coefficient, good insulation, moderate weight, easy rolling, good wind resistance, good water resistance, and a service life of up to 10 years.

1. The needle punched non-woven insulation layer consists of three layers, and the needle punched non-woven insulation cover is made of waterproof non-woven fabric. Low ventilation can also reduce the heat dissipation of temperature to a certain extent, playing a certain role in the insulation effect of the thermal insulation cotton quilt.

2. The needle punched non-woven fabric insulation core is the main insulation layer. The insulation effect of needle punched non-woven insulation blankets mainly depends on the thickness of the inner core. The insulation core is evenly laid on the inner layer of the insulation blanket.

3. The important factor inside insulation is the thickness of the core, the thickness of the core, and the better the insulation effect. When using insulation materials in greenhouses, thick insulation blankets are usually chosen. The thickness of the greenhouse insulation core is usually 1-1.5 centimeters, while the insulation layer thickness used in engineering is 0.5-0.8. Choose insulation materials with different thicknesses according to different applications.

4. Needle punched non-woven fabric, as the main material for greenhouse insulation quilts, has the characteristics of high tensile strength, non loosening, weather resistance, and no fear of corrosion. The cycle of needle punched non-woven fabric greenhouse insulation quilts is generally 3-5 years.

The principle of selecting fiber varieties in the production of needle punched non-woven fabrics

The principle of selecting fibers is a crucial and complex issue in the production of needle punched non-woven fabrics. Generally, the following principles should be followed when selecting fibers.

1. The fibers selected for needle punched non-woven fabric should be able to meet the performance requirements of the product’s intended use.
Classification and selection of needle punched non-woven fabric fiber raw materials.

2. The specifications and properties of needle punched non-woven fabric fibers should be adapted to the processing capacity and characteristics of production equipment. For example, wet web forming generally requires fiber length to be less than 25mm; And combing into a web generally requires a fiber length of 20-150mm.

3. Under the premise of meeting the above two points, it is better to have a lower price for fiber raw materials. Because the cost of needle punched non-woven fabric mainly depends on the price of fiber raw materials. For example, nylon has good performance in all aspects, but its price is significantly higher than polyester and polypropylene, which limits its application in needle punched non-woven fabrics.