Nonwoven equipment for hygiene application-Explanation of the components of diapers
It is understood that a group of survey data on diapers shows that 20.47% of users are very concerned about the breathability of diapers when choosing baby diapers. The sweat holes of the baby's skin sweat glands are very small, and the temperature of the skin cannot be well controlled. For example, the permeability of the diapers is poor. After the urine is absorbed, the heat and moisture are gathered in the diapers, which is easy to make the baby feel stuffy and hot, and may make the little farts red, swollen, and inflamed, leading to Irritant diaper dermatitis.
Due to the humid and hot environment inside diapers when urine is produced, from a professional perspective, the so-called breathability actually refers to the water vapor permeability, which can be expressed by the water vapor transmission rate (g/cm2 · 24h). The bottom film, also known as the outermost layer of diapers, is usually the main factor affecting the breathability of diapers, and it is also the layer that needs to come into contact with the baby's skin, just like the skin layer. The non-woven material used for the bottom film utilizes water droplets (minimum droplet diameter 20 μ m) And water vapor molecules (diameter 0.0004 μ m) The difference achieves waterproof and breathable effects.
The surface layer is one of the main components of baby diapers and is also a very important part. The surface layer is in direct contact with the baby, so the comfort of the surface layer will also directly affect the baby. The following are the performance requirements for each component of diapers and the selection of non-woven fabrics.
The surface layer is the part that directly contacts the human skin, so it is required to have dry, comfortable, and soft characteristics. During the use of diapers, urine needs to quickly penetrate the surface layer, so the surface layer needs to have good hydrophilicity, and can penetrate multiple times with minimal infiltration. At present, the surface layer of diapers on the market mainly uses spunbond and hot air nonwoven fabrics.
Ten years ago, 80% of the surface layer of diapers was made of spunbond non-woven fabric. In recent years, people's pursuit of the softness and comfort of diapers has become increasingly strong. Hot air non-woven fabric is increasingly used in the surface layer due to its fluffy and soft properties. And spunbond nonwoven fabric has high strength, good water absorption performance, and is dry and comfortable, and is still one of the main materials for the surface layer. Through the improvement of formula and equipment, the softness of spunbond nonwoven fabric has been greatly improved, but the fluffiness is still not as good as that of hot-air nonwoven fabric. The development trend of surface layer is characterized by fast penetration rate, dryness, softness, and cotton sensation.
2. Bottom layer
The function of the bottom layer is to prevent urine leakage. In the early days, paper diapers mainly used PE film as the bottom layer. With the increasing demand for comfort from consumers, the bottom layer composed of nonwoven fabric and PE film emerged. The softness of the bottom layer is one of the important criteria for consumers to judge the softness of diapers. Therefore, non-woven fabrics used for the bottom layer not only have the characteristics of impermeability, less fuzzing, and good strength, but also need to have a fabric like soft touch and wear resistance.At present, spunbond nonwoven fabrics are the main material for bottom layer nonwoven fabrics due to their low cost, good wear resistance, softness, and thinness. However, due to the soft and fluffy characteristics of hot air nonwoven fabrics, many diaper products have switched to hot air nonwoven fabrics for the bottom layer in recent years. However, hot air nonwoven fabrics are made of short fibers, and their shaping effect is not as good as spunbond nonwoven fabrics. Compared to spunbond nonwoven fabrics, the fuzzing is slightly more severe. In recent years, many hot air nonwoven manufacturers have greatly reduced fuzzing by adding ironing rollers and other processes. Soft, cotton textured, wear-resistant, and lightweight are the development directions for the bottom layer.
3. Waist circumference
The non-woven fabric used for the waistline of drawstring pants needs to have the characteristics of good strength, less fuzzing, and strong fabric feel. Currently, spunbond non-woven fabric is mainly used. Some companies try to use elastic film and hot air nonwoven fabric for waist circumference, but the strength of the seam bonding of the hot air nonwoven fabric is weak. In addition, although the hot air nonwoven fabric is relatively fluffy, it is thicker for waist circumference and has no special feel. Currently, it is not the main material selected for waist circumference. Soft and fluffy, wear-resistant, and breathable are the development trends of waist circumference.
4. Leak proof edge partition
The main function of the leak proof barrier is to prevent urine from leaking out from both sides. Therefore, the use of non-woven fabrics for leak proof barriers requires good water repellency, high strength, and softness. Currently, spinning and melting non-woven fabrics (SMS) are mainly used. The development trend of leak proof edges is to have high barrier properties, softness, cotton texture, and lightness.
5. Core wrapping layer
The main function of the core wrapping layer is to prevent SAP and fluff slurry from loosening and leaking, and materials with good coverage, hydrophilicity, and softness should be selected. The material used before was toilet paper. However, due to the poor wet strength of toilet paper and its tendency to break after absorbing water, more and more core body wrapping layers are currently using spunbond non-woven fabrics. The development trend of core encapsulation is good wet strength, softness, hydrophilicity, and low infiltration.
6. Diversion layer
The diversion layer is located below the surface layer, and its function is to accelerate liquid penetration and diffusion, reducing liquid infiltration. The non-woven fabric used for the guide layer should have the characteristics of hydrophilicity, fast liquid penetration, and good liquid diffusion. In the early days, spunbond non-woven fabrics or perforated films were mainly used as the guide layer, but in recent years, hot air or chemically bonded non-woven fabrics have been mainly used. In order to improve visual effects, different colored non-woven fabrics are also used as the guide layer. Improving the flow velocity, expanding the flow area, and making the liquid evenly distributed are the development trends of the flow layer.
7. Front waist patch
The front waist patch needs to have characteristics such as high strength, easy adhesion, non fuzzing, and high peel strength. Previously, it was mostly composed of spunbond nonwoven fabric and film, or spunbond nonwoven fabric and film composite and re embossed materials, but due to its high cost, it has gradually been replaced by spunbond nonwoven fabric. The development direction of front waist patches is high strength, comfortable feel, and elegant appearance.
8.Left and right stickers (ear straps)
The left and right stickers need to have the characteristics of high strength, good uniformity, and softness and comfort. Previously, spunlaced non-woven fabrics were commonly used, but due to the lower cost of spinning and melting non-woven fabrics(SMS), they have become the mainstream in the market.
In recent years, high-speed spunbond and meltblown nonwoven equipment such as SMS, SMMS, and SSMMS have become increasingly popular among medical and sanitary material manufacturers in the application range of sanitary materials. More and more people are using SMS, SMMS, and SSMMSnonwoven equipment for hygiene applicationto produce sanitary material related products,just like baby diapers and adult diapers.
Zhejiang Yanpeng Nonwoven Machinery Co.,Ltdis a professional manufacturer of nonwoven fabric production line which engaged in development and production for many years. Our company has focused on making nonwoven production line since 2008, We can provide customized single S, SS ,SSS spunbond nonwoven production line,SSMS, SMMS SMS spunmelt (spunbond & meltblown) production lines,and other PP,PET/PLA Biodegradable non woven machine, BiCo spunbond production line to our customers.
Yanpeng people will continue to be dedicated to the development of non-woven equipment and related products.We sincerely want to return our customers with cost-effective products and best service.
Our polypropylene(PP) spunbond nonwovenequipment is constantly updated after years of production practice, which makes the design ofnon-woven fabricproduction line more perfect and the operation easier.Our equipment is constantly improving. Our equipment is constantly improving, under the premise of complete specifications, superior performance, excellent quality and beautiful color, it can also add recycled material and filling to reduce the cost of products.
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