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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.

Release paper is an indispensable part of the sanitary napkin raw materials. Its position in sanitary napkins is mainly located in the viscose part of its bottom layer. Specifically, depending on the structural design of the sanitary napkin, the release paper may cover the following key positions: Bottom center: The bottom center of the sanitary napkin is usually coated with viscose to fix it on the underwear. Release paper will cover this layer of viscose to prevent the viscose from losing its stickiness or sticking to other materials during packaging, transportation and storage. Wing release paper: Some sanitary napkins are designed with wings, which are also usually coated with viscose to better fix on the sides of the underwear. In this case, the release paper will also cover the viscose part of the wing to ensure that the viscosity of the viscose is not affected before use.   Tail part (if applicable): For some specially designed sanitary napkins, such as those with tails, the tail part may also be coated with viscose. Release paper will also cover the viscose part of the tail to protect its stickiness. In summary, the position of the release paper in the sanitary napkin is to cover the bottom adhesive part, including the bottom center, the wing part (if applicable), and the tail part (if applicable). These designs are all to ensure the stickiness and hygiene of the sanitary napkin before use, and at the same time make it easy for consumers to peel off the release paper and stick the sanitary napkin accurately on the underwear during use.

The spunlace nonwoven process is an advanced fiber processing technology that uses high-pressure water to spray the fiber web so that the fibers are entangled with each other to form a cloth. The entire process includes fiber web formation, pre-wetting, spunlace reinforcement, post-treatment, drying and shaping, curling and cutting. First, fibers such as polyester, viscose, and wood pulp are spread into a uniform fiber web through air or water flow. Then, a pre-wetting treatment is carried out to compact the fiber web and remove the air so that the fiber web can absorb the energy of the water jet more effectively. Then, the fiber web is fed into the spunlace machine, and the high-pressure water jet is sprayed onto the fiber web at a high speed, causing the fibers to displace, intersperse and entangle, forming flexible entanglement points and reinforcing the fiber web. There are three types of spunlace reinforcement methods: flat net, rotating hub, and a combination of the two, which can meet different production needs. The spunlace nonwoven process has the characteristics of environmental protection, high strength, softness, breathability, and adaptability. No chemical adhesives are used, and the environmental performance is excellent; the tightly entangled structure formed by high-pressure water flow gives it high strength and durability; good softness and skin-friendliness are suitable for close-fitting products; the tiny channels between fibers are conducive to air circulation and have good air permeability; it is suitable for a variety of fiber raw materials and can be customized according to customer needs. Spunlace nonwoven fabrics are widely used in medical and health, personal care, household goods and industrial fields. Such as medical supplies such as surgical gowns, masks, bandages, disposable sanitary products such as sanitary napkins and diapers, cleaning supplies such as rags and mops, as well as filter materials, insulation materials, packaging materials, etc. In short, the spunlace non-woven fabric process, with its unique characteristics and excellent performance, has brought convenience to people's lives and work in many fields.

Diapers are a must have item for modern babies. The core of diapers directly affects the product quality such as water absorption and breathability. At present, there are four main types of diaper cores: Wood pulp core (fluff pulp): It is a mixture of wood pulp and polymer water-absorbing resin, without stratification. Its advantage is that wood pulp fibers can effectively comb urine into the core, and polymer materials lock urine to keep the surface dry. However, the presence of wood pulp leads to easy lumps and fractures. Despite this, its excellent urine combing performance is still adopted by major international brands. The thinness is average, the water absorption and breathability are good, the softness is moderate, and the lumps and fractures are more obvious. Dual core (second-generation core): The structure is similar to sheet stacking, combining the super absorbent polymer  guide layer and the wood pulp layer, optimizing the water absorption and structural design. The wood pulp layer combs urine, and the polymer layer absorbs, with strong water absorption capacity and large water absorption. However, the stacking structure plus non-woven fabric is prone to soft lumps. The thinness is average, the water absorption is excellent, the air permeability is slightly weak, the softness is good, and the problem of lumping and faulting is moderate. Glue core (third generation core): It is mixed with hot melt adhesive, non-woven fabric and polymer absorbent resin, and is layered. The polymer ensures the absorption amount, and the glue bonding remains flat and does not clump. However, after absorbing water, the whole expands, the air permeability is poor, and it may cause discomfort to the baby. Insufficient technology may cause the glue to smell or harden, and the cost is high. The thinness is average, the water absorption is good, the air permeability is very poor, the softness is moderate, and the problem of lumping and faulting is less. Braided core: It is woven with breathable, flexible, and moisture-proof materials, filled with polymer absorbent primers, and has a special surface layer on the outside. The non-laminated structure is thin and not easy to clump and fault, and the diversion effect is good. But the cost is high. The thinness is excellent, the water absorption, air permeability, and softness are all good, and the problem of lumping and faulting is less. To sum up, various core structures have their own advantages and disadvantages, and parents can choose suitable products according to their baby's needs and budget.

The non woven full laminated PE film is mainly made of polyethylene (PE) material, which has good water resistance and breathability. It is mainly used to prevent urine leakage and keep the skin dry. Backsheet PE full laminating film is usually laminated of PE film or a lamination of PE film and non-woven fabric. The outermost layer is usually PE film, and the inner layer may contain non-woven fabric to increase comfort. The working principle of full lamination film back sheet is based on its material properties. PE film has good water resistance, which can effectively prevent urine from penetrating into the outside of diapers. At the same time, it has good breathability, which can help dissipate moisture and prevent babies from developing red buttocks. The breathability of PE film is achieved through its microporous structure, which allows water vapor to pass through but prevents liquid from passing through, thus achieving the function of breathability and impermeability.

The PE pouch film for sanitary napkin mainly plays a role in maintaining the sterile state of sanitary napkins, preventing bacterial invasion, and avoiding mosquito invasion. The PE pouching film is usually made of PE film material, which has stretchable and waterproof properties and is widely used in the personal care industry, such as women's sanitary napkins, pads, adult diapers and other products. In addition, the design and material selection of the female sanitary napkin pouching PE film are also very important. Modern sanitary napkins typically adopt a 360 degree fully wrapped design, with the outer film wrapping the entire sanitary napkin and adhering it to the outside of the breathable base film through a non fluorescent adhesive to improve the quality and comfort of the sanitary napkins. Different materials of coating also have their own characteristics. For example, PE packing film for sanitary napkin has stretchable and waterproof properties, while non-woven coating is more environmentally friendly, consisting of non-woven fabric and a very thin layer of PE film.

  The frontal tape loop of a diaper is one of the important parts of a diaper. It is usually used to fix the position of the diaper on the baby's body to ensure that the diaper is not easily displaced or loosened. The material and structural design of the front waist tape play a vital role in the comfort, fit and performance of diapers. According to different materials and surface treatments, the front waist tape can be divided into several types, each with different characteristics and advantages. The following are several common types of front waist tape: 1. PP diaper frontal tape Material characteristics: Polypropylene (PP) is a common synthetic plastic with high strength, rigidity and wear resistance, suitable for use in places where strong bonding is required. PP front waist tape usually uses non-woven fabric or film material, which is heat-pressed or bonded to form a solid waist tape. The surface is usually smooth, which is suitable for automatic bonding during the production process. Advantages: Strong adhesion: Polypropylene material can provide strong bonding to ensure that the front waist tape fits firmly on the baby's waist. Lower price: The cost of polypropylene material is low, which can reduce the production cost of diapers. Strong wear resistance: suitable for long-term use, not easy to break or fall off. Disadvantages: Since polypropylene itself does not have good softness, it is sometimes less comfortable and may cause friction to babies with sensitive skin. 2. Knitted frontal tape for diaper Material features: The mesh frontal tape usually uses a combination of polypropylene non-woven fabric and mesh material. The mesh structure makes the tape more breathable while maintaining adhesion. The mesh material itself is relatively thin, soft, and has less friction on the skin. Advantages: Better breathability: The mesh structure can increase air circulation, reduce stuffiness, and help babies stay dry. Soft and comfortable: The mesh material is softer, reduces friction on the skin, and improves comfort. High strength: The mesh structure can provide good resistance to stretching and deformation. Disadvantages: Compared with traditional flat materials, the production process is more complicated, so the cost may be slightly higher. 3. Brush frontal tape Material features: Suede frontal tape usually uses non-woven fabric with fluff on the surface (such as polypropylene non-woven fabric), which makes the surface of the frontal tape softer. Suede structure can enhance the comfort of the waist tape and reduce irritation to the baby's skin. Advantages: Very soft: Suede material is soft and suitable for baby's sensitive skin, which can provide higher comfort. Skin-friendly: Suede material can better fit the baby's waist curve and reduce the discomfort caused by friction. Good breathability: Although suede material looks thicker, its breathability is usually still good. Disadvantages: May be easy to pilling: Because the surface is suede material, after multiple stretching and friction, some pilling may occur, affecting the appearance. High cost: The production cost of suede material is relatively high, so the price of this type of diapers may be more expensive. 4. Nonwoven frontal tape Material features: Nonwoven frontal tape is generally made of polypropylene (PP) or other synthetic fibers, with a smooth surface, which can be processed by heat pressing or bonding. Nonwoven materials have good air permeability and softness, and the production process is simple and the cost is low. Advantages: Good air permeability: The structure of nonwoven fabrics is usually loose, which can provide a certain air permeability and help maintain dryness. Higher comfort: Compared with traditional plastic materials, nonwoven fabrics have certain advantages in softness and comfort. High cost performance: The production cost of nonwoven frontal tape is low, which can provide reasonable performance and low price. Disadvantages: Weak adhesion: Compared with PP frontal tape, the adhesion of nonwoven fabrics may be slightly insufficient, and a stronger adhesive may be required. Low durability: Compared with mesh or suede frontal tape, nonwoven fabrics may be less durable and strong after long-term use. Summary Each type of frontal tape material has its specific advantages and disadvantages. Manufacturers usually choose the right material based on product positioning, target market and cost requirements.