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Fluff pulp plays a vital role in diapers. As one of the core absorbent materials, the characteristics of diaper fluff pulp directly determine the performance of diapers. Its fibers can quickly absorb and disperse urine with excellent moisture absorption, and work together with polymer absorbent resin (SAP) to form a powerful absorption system, ensuring that diapers remain dry for a long time and effectively reducing the baby's discomfort. In addition, the mesh structure of fluff pulp brings good breathability to diapers, helps reduce moisture accumulation, thereby preventing red buttocks and diaper rash, and carefully protecting the baby's delicate skin. At the same time, the softness of fluff pulp makes diapers fit the baby's body better, reduces friction, and further improves the comfort of wearing. In terms of structural stability, fluff pulp is closely combined with other materials such as SAP and non-woven fabrics to form a stable absorption layer. This structure not only effectively prevents the diaper from deforming or bunching up after absorbing water, but also maintains the integrity and high absorption efficiency of the diaper.

Treated fluff pulp (treated wood pulp) and untreated fluff pulp (untreated wood pulp) are significantly different in many dimensions. Fluff pulp, whether it is virgin wood pulp or recycled wood pulp (such as regenerated pulp), has been chemically or mechanically treated, a step designed to remove impurities and improve the purity and separation of fibers. In contrast, untreated fluff pulp is extracted directly from wood without any further treatment, so it contains more impurities and incompletely separated fibers. In terms of performance, fluff pulp shows higher absorption performance, its fiber structure is uniform, its air permeability is good, and it is soft and delicate, all of which help to improve the comfort of the product. At the same time, fluff pulp is more closely integrated with other materials, and its structural stability is strong, which can effectively prevent diapers from deforming or lumping after absorbing water. In contrast, untreated fluff pulp has poor absorption performance, air permeability and softness, and its structural stability is also insufficient. In terms of application and market demand, fluff pulp is widely used in high-end diapers, sanitary products and other fields due to its excellent performance, meeting consumers' demand for product quality and comfort. Untreated fluff pulp is mostly used in low-end or low-cost products, but as consumers' requirements for product quality and environmental protection continue to increase, its market demand may gradually decrease.

Diapers mainly have the following SAP sheet raw materials types: 1.Fleece pulp core: A traditional core made by mixing fluff pulp and polymer absorbent resin. It has good drainage properties, can quickly absorb urine and lock it in through polymer materials, keeping the baby's skin dry. However, the fluff pulp core is prone to clumping and fracturing due to its loose structure and lack of adhesive fixation. 2.Composite core: composed of dust-free paper, non-woven fabric, and polymer absorbent resin, bonded between each layer of material with hot melt adhesive. This type of absorbent core baby diaper is not prone to clumping or breaking, and can maintain its original shape after absorbing water, making it lightweight and comfortable. Although the process is complex and costly, it has stronger absorption and locking power, providing better comfort and absorption efficiency. 3.Full core body: mainly composed of high polymer water absorbing resin, with fast absorption speed, less reverse osmosis, good breathability, but relatively hard. 4.Ultra thin absorbent core: Similar to a full core, but thinner and more lightweight.

Sanitary napkins, as an indispensable item in women's daily life, the choice of sanitary napkins topsheet material is directly related to the comfort and health of use. So, what are the topsheet materials of sanitary napkins? What are their respective characteristics? The most common sanitary napkins topsheet material is nonwoven. Nonwoven fabrics are soft, breathable, and absorbent. They can quickly absorb and disperse menstrual blood, keep the surface dry, and reduce moisture and discomfort. In addition, nonwoven fabrics also have good wear resistance and tear resistance, are not easy to break, and ensure the service life of sanitary napkins. The topsheet of dry mesh sanitary napkins is carefully made of various perforated films treated with special processes as raw materials. These perforated films are covered with fine micropores, so that liquids such as menstrual blood can quickly penetrate through these micropores into the lower absorbent layer and be effectively absorbed. This design not only ensures the dryness of the surface of the sanitary napkin, but also improves the breathability, reduces moisture and discomfort, and provides women with a more comfortable use experience. In recent years, sanitary napkins with a soft cotton topsheet have also appeared on the market. The soft cotton surface is made of natural cotton fiber, which is softer and more comfortable to the touch and less irritating to the skin. At the same time, the soft cotton surface also has good moisture absorption and breathability, which can keep the private parts dry and clean. However, it should be noted that the price of sanitary napkins with a soft cotton surface is relatively high, and in certain special environments (such as high temperature and humidity), it may be more likely to breed bacteria, so more attention should be paid to keeping them clean and dry when using them.

The diaper absorbent core of baby diapers is the core component that realizes its urine absorption function, which mainly relies on the excellent performance of polymer absorbent resin (SAP). SAP can absorb and lock a large amount of water, and its water absorption capacity is so strong that it can reach hundreds or even thousands of times its own weight. In the structure of diapers, absorbent polymer exists in granular form and is mixed with fluff pulp to form the absorbent layer. When urine touches the surface layer of the diaper (usually made of non-woven fabric), the urine will be quickly received and transferred to the diversion layer, which is also made of non-woven fabric to ensure that the urine can be evenly distributed to the absorbent layer. In the absorbent layer, the hydrophilic group of SAP immediately takes effect, quickly attracting and fixing water molecules, causing the SAP particles to swell and fuse with each other, thereby efficiently absorbing urine. SAP itself has the property of being insoluble in water, so it can absorb a large amount of urine without exudation. At the same time, its excellent water retention capacity ensures that the urine is firmly locked inside the diaper, effectively preventing urine backflow or leakage. In summary, the process of urine absorption by polymers in baby diapers is a complex system involving multiple efficient steps such as urine reception, conduction, absorption and locking. This process ensures that diapers can quickly and effectively absorb and lock urine, providing babies with a lasting dry and comfortable experience.

Super absorbent polymer , as the core of sanitary napkin absorbent materials, is undoubtedly a perfect combination of technology and comfort when used in sanitary napkins. SAP has demonstrated the following outstanding effects: Extraordinary water absorption performance: SAP has excellent water absorption capacity, which can quickly absorb and firmly lock a large amount of liquid, such as menstrual blood, to ensure that the sanitary napkin remains dry in the face of turbulent liquid flow, effectively relieving moisture and discomfort.   Stable water retention performance: After absorbing water, SAP will form a stable gel structure, which is difficult to release water molecules even under external pressure. This excellent water retention performance prevents the sanitary napkin from quickly re-seeping after absorbing liquid, thus keeping it dry for a long time. Significant anti-side leakage effect: SAP's water absorption and expansion characteristics form a solid barrier inside the sanitary napkin, effectively preventing the liquid from spreading to both sides, significantly reducing the risk of side leakage.   Improved comfort: SAP is soft and skin-friendly, making the sanitary napkin fit the skin better during use, significantly reducing friction and discomfort, and improving the overall user experience. In summary, super absorbent polymer (SAP), as a key absorbent material in sanitary napkins, plays multiple important roles such as water absorption, water retention, leakage prevention and comfort improvement, bringing women a more comfortable and dry experience during menstruation.

Spandex, as an elastic material, is crucial in the application of baby diapers and other disposable sanitary products (including adult diapers, pull-up pants and safe pants). Its main functions are reflected in the following aspects: First, Spandex used in baby diapers greatly improves the fit of diapers with its excellent stretch and recovery properties. It can ensure that the diaper tightly wraps the baby's legs, lower abdomen or the body curve of the adult user, effectively preventing urine and feces from overflowing, and providing all-round protection. Second, Spandex gives diapers higher elasticity, making the product softer and more comfortable, adapting to different body shapes and movements, thereby improving the user experience.   Furthermore, Spandex also increases the softness of diapers, enhances the comfort and fit of the product, reduces friction and irritation to the skin, and protects the skin health of users.   In addition, the elastic application of Spandex in diapers, such as elastic waist, ear stickers and waist ring designs, significantly improves the leak-proof performance of diapers, effectively prevents liquid side leakage and back leakage, and keeps diapers dry and clean.   Finally, as consumers' demand for diaper elasticity continues to increase, the application scope of spandex has gradually expanded from basic leg circumferences and three-dimensional guards to more parts, meeting the diverse needs of different users for diaper fit, comfort and aesthetics. In summary, spandex plays multiple roles in disposable sanitary products such as baby diapers and is a key factor in improving diaper quality and user experience.

Although spandex only accounts for 2-3% of the cost of diapers, the performance of spandex directly affects the quality of diapers and the efficiency of diaper production. Generally speaking, spandex yarn for diapers with excellent performance should have three characteristics: suitable elasticity, smooth unwinding and good adhesion. First, spandex yarn for diapers needs to have suitable elasticity and elastic recovery rate. When the elastic recovery is too low, the diaper will not be able to prevent side leakage; when the elastic recovery is too high, the waistline will shrink too tightly, affecting the comfort of wearing. Secondly, elastane spandex for diapers needs to have good unwinding performance. If the machine stops due to broken yarn caused by poor unwinding of spandex, it will directly affect the production efficiency and production cost of diapers. Finally, spandex for diapers should have good adhesion to substrates such as non-woven fabrics. In the production process of diapers, spandex is fixed to the base material by hot melt adhesive or other adhesives. If spandex cannot form a strong bond with the base material, it is very easy for the spandex to separate from the non-woven fabric during the use of the diaper, causing problems such as elastic failure and side leakage of the diaper.

Hot melt adhesives are a type of plastic adhesive whose physical state changes with temperature, but whose chemical properties remain unchanged. They are non-toxic, odorless, environmentally friendly and have high added value. Because they are easy to pack, transport, store, and are pollution-free, and have high bonding strength and fast speed, they are widely used as diaper adhesives to bond the materials between the diaper's edges and layers. The production process of diapers is complex and is composed of a variety of materials, which are bonded by hot melt adhesives. Sometimes mothers will find yellow colloids on the back or surface of diapers, which is called dripping glue. Glue dripping is formed when the pores are blocked when applying glue with a spray gun or a scraper. Although large factories use advanced detection systems, glue dripping cannot be completely avoided. However, glue dripping is only a production defect and will not cause harm to the human body. Mothers can use diapers containing hot melt adhesives with confidence. The smell of hot melt adhesives comes from the inherent smell of its raw materials such as resins and tackifiers. New smells may be generated due to the influence of production and circulation links, but they are generally mild and non-toxic. In the production of diapers, the glue dripping caused by hot melt adhesives is a production defect, which is harmless to the human body and belongs to the scope of product after-sales. Therefore, mothers do not need to worry too much about the smell or glue dripping of diapers containing hot melt adhesives.

The adhesives used in disposable sanitary products are mainly hot melt adhesives based on thermoplastic polymers. This material is applied in a molten state, can wet the adherend, and can achieve rapid bonding by applying light pressure after cooling and hardening. Its main types cover a variety of special adhesives, as follows:   1.Position adhesives are mainly used for the back layer of sanitary napkins. It can firmly stick the sanitary napkin to the underwear and effectively prevent movement. The adhesive has moderate cotton cloth peeling force and excellent anti-transfer performance. It has strong adaptability to seasons and regions and can maintain initial adhesion even in low temperature environments. In addition, it has light color, low odor, is not sensitive to ultraviolet light, is safe and non-toxic to use, and is not easy to cause allergies. 2.Construction adhesives are specially used for bonding non-woven fabrics, perforated films and PE back films, as well as absorbent paper and non-woven fabrics, PE or fluff pulp and other materials. At the same time, it can also effectively bond elastic waistbands and PE back films. Structural adhesives have good thermal stability and suitable open time, and have excellent bonding effect on PE film and non-woven fabrics, no reverse osmosis, no scalding of PE film, and excellent performance on the machine. 3.Elastic adhesives are mainly used to fix elastic materials, so that they can be better bonded to non-woven fabrics and base films, thereby enhancing the close-fitting comfort and leak-proof performance of the product. Elastic adhesives have high creep resistance, good thermal stability and suitable open time, and have good bonding effect on elastic materials and PE backing materials or non-woven fabrics, no reverse osmosis, and are soft and elastic. 4.Wetness indicator adhesives are a kind of hot melt pressure-sensitive adhesive containing PH color developer, which will change color when wetted with urine, playing a prompting role. During use, the glue temperature and parking time of urine indicator adhesive in the glue machine must be strictly controlled to prevent excessive aging and loss of urine indicator function.   These hot melt glues have been widely used in disposable sanitary products such as sanitary napkins, diapers and other products, ensuring that the products have good bonding performance and user experience during use.

Sanitary napkin perforated film, mainly refers to PE perforated film, its functions and effects are very significant, mainly reflected in the following aspects: First, PE perforated film can effectively keep dry. It is composed of PE film and specially designed micropores, which can prevent liquid penetration while allowing air circulation. When menstrual blood flows out, it can be quickly absorbed by the absorbent material of the lower layer through these micropores, so that the surface of the perforated film remains relatively dry, greatly reducing the feeling of moisture and discomfort. Secondly, the perforated film significantly enhances the breathability of sanitary napkins. These cleverly designed micropores provide valuable breathing space for the skin, effectively reducing the stuffiness when wearing sanitary napkins for a long time, thereby improving the comfort of users. This breathability improvement effect is particularly significant in hot weather or when worn for a long time.   Furthermore, the perforated film also has the function of promoting menstrual blood diversion. Micropores not only help to keep dry and breathable, but also cleverly guide menstrual blood to flow more easily to the absorbent material of the lower layer, avoiding the accumulation of menstrual blood on the surface of sanitary napkins, thereby reducing the risk of side leakage and making the use of sanitary napkins safer and more reliable. However, when choosing sanitary napkins, we also need to pay attention to the material selection and personal needs of the perforated film. The perforated film materials and processes used in sanitary napkins of different brands and models may be different, so we need to pay attention to information such as its material and breathability. At the same time, since everyone's physique and needs are different, when choosing sanitary napkins, we should also choose according to our actual needs and comfort.   In summary, sanitary napkin perforated film plays an important role in keeping dry, enhancing breathability, and promoting menstrual blood diversion. But when using it, we still need to pay attention to the material selection and personal needs to ensure the comfort and safety of use.

Sanitary napkin release paper is crucial in the design and use of sanitary napkins. Its main functions include: First, protect stickiness. The bottom layer of sanitary napkins is coated with viscose to fix it to underwear, and the release paper covers the viscose to prevent it from sticking to other materials during packaging, transportation and storage, ensuring that the viscose remains sticky.   Second, it is easy to use. The release paper allows consumers to easily remove the sanitary napkin from the package and stick it to the underwear accurately. It is designed to be easy to peel off and can be separated with just a slight tear without damaging the structure or stickiness of the sanitary napkin. Furthermore, it maintains hygiene. The release paper covers the viscose part to prevent dust, bacteria and other pollutants from directly contacting the viscose, reducing the risk of sanitary napkins being contaminated before use.   Finally, improve product quality. The use of release paper is an important part of the sanitary napkin production process. It requires close integration with the viscose and easy peeling, which places high demands on the production process and material selection. Optimizing the performance of release paper can further improve the overall quality and user experience of sanitary napkins. In summary, sanitary napkin release paper plays an important role in protecting stickiness, facilitating use, maintaining hygiene and improving product quality. It is an indispensable part of the sanitary napkin design and production process, ensuring the convenience and hygiene of sanitary napkins.