Fluorescent Whitening Spunlace Nonwoven Fabric Product

I. Product Foundation: Diverse High-Quality Base Materials, Meeting Whitening Scenario Requirements

The whitening effect and user experience of fluorescent whitening spunlace nonwoven fabric start with the precise selection and scientific proportioning of raw materials for the spunlace base materials. Our company carefully selects various high-quality fibers such as polyester, viscose, pure cotton, and bamboo fiber, and combines the requirements for base material whiteness, skin-friendliness, and washability in different scenarios to create spunlace base materials that balance basic performance and whitening compatibility, providing a stable carrier for the uniform adhesion and long-lasting effect of fluorescent whitening agents:

Polyester Fiber: Endows the base material with excellent tensile strength, tear resistance, and washability, ensuring that the base material does not deform or break after whitening processing and repeated washing (such as in home textiles); at the same time, polyester fibers have strong adsorption stability for fluorescent whitening agents, reducing the loss of agents during use and ensuring that the whitening effect does not fade over time, suitable for scenarios with high durability and washability requirements such as home and packaging;

Viscose Fiber: Has excellent moisture absorption and a porous fiber structure, which can quickly and evenly adsorb fluorescent whitening agents, ensuring a whitening effect without dead corners; at the same time, its soft and skin-friendly touch makes the product more comfortable in hygiene products and medical skin-contact scenarios, avoiding rough skin sensation caused by whitening processing, suitable for close-fitting use requirements;

Pure Cotton Fiber: Natural, environmentally friendly, and biocompatible, with no irritation or odor, and a good natural whiteness base, which can present a more natural "bright white" texture after fluorescent whitening rather than a harsh "pale white"; after pairing with the whitening process, it becomes the preferred base material for scenarios with strict requirements for safety and visual quality such as baby hygiene products and high-end medical auxiliary materials;

Bamboo Fiber: Has good breathability and is environmentally degradable, with natural textures on the fiber surface that enhance the binding force with fluorescent whitening agents, preventing agent shedding; at the same time, the natural antibacterial properties of bamboo fiber combined with the whitening effect form a "function + appearance level" dual advantage, suitable for scenarios such as high-end home decoration and eco-friendly hygiene products that pursue both naturalness and quality.

We flexibly adjust the raw material ratio according to customer needs - for example, in washable scenarios such as home textiles, the proportion of polyester can be increased (such as 60% polyester + 40% viscose), while for baby hygiene products and medical auxiliary materials, viscose / pure cotton / bamboo fiber are mainly used. Each batch of base materials undergoes multi-dimensional testing including weight (adjustable from 20 to 180g/㎡), original whiteness (≥80 degrees), strength, and breathability, with errors controlled within a very small range to ensure stable base material performance and lay a solid foundation for the precise implementation of the fluorescent whitening post-treatment process.

II. Core Technology: "Spunlace Base Material + Immersion and Impregnation Fluorescent Whitening", Achieving Uniform and Long-Lasting Whitening

The core technology of our fluorescent whitening spunlace nonwoven fabric lies in the combination of "spunlace base material + immersion and impregnation fluorescent whitening process", which achieves uniform and long-lasting whitening. Through the precise control of the immersion and impregnation process, the fluorescent whitening agent is evenly distributed throughout the base material, ensuring a uniform and lasting whitening effect without affecting the original flexibility and breathability of the base material. This technology not only enhances the appearance quality of the product but also ensures its safety and durability, providing customers with high-quality whitening solutions that meet their specific needs. Our company's fluorescent brightening spunlaced non-woven fabric strictly follows the step-by-step process model of "first making the spunlaced base material, then conducting fluorescent brightening finishing treatment". According to the characteristics of different base materials and brightening requirements, we take the immersion and pressing method as the core processing method, customize and optimize the finishing treatment plan, and achieve the triple guarantee of "stable base material + uniform brightening + long-lasting effect" through refined control, ensuring that the product has excellent and safe brightening performance:

(1) Pre-treatment of spunlace base material: Enhance the adsorption of brightening agents

Before the fluorescent brightening finishing treatment, we conduct targeted pre-treatment on the spunlace base material to create conditions for the uniform adsorption and long-lasting effect of the brightening agents:

For base materials with strong moisture absorption such as viscose, pure cotton, and bamboo fiber, we use low-temperature drying (temperature 60-70℃) to remove excess surface moisture, avoiding the impact of moisture on the concentration stability of the brightening agents, and at the same time remove the tiny impurities on the surface of the base material (such as fiber fuzz) to ensure that there are no "spots" in the brightening effect;

For synthetic fiber base materials such as polyester, we use a weakly alkaline solution (pH value 7.5-8.0) for mild treatment to activate the active groups on the surface of the fibers, enhancing the adsorption capacity of the base material for the fluorescent brightening agents, and avoiding uneven adhesion of the agents due to the hydrophobicity of the fibers, ensuring a consistent brightening effect overall.

(2) Fluorescent brightening finishing treatment: Immersion and pressing method, customized brightening plan

Relying on a customized fluorescent brightening production line, we select brightening agents that meet national environmental protection standards (such as stilbene and coumarin types) based on the customer's requirements for brightening degree (adjustable white value 85-95 degrees), safety (such as baby and medical grade), and wash resistance, and achieve efficient and uniform brightening through the immersion and pressing method, ensuring that both the brightening effect and safety performance meet the standards:

Selection of brightening agents: We strictly select environmentally friendly fluorescent brightening agents that comply with GB 18401-2010 "National Basic Safety Technical Specifications for Textile Products" and OEKO-TEX® Standard 100, ensuring no harmful heavy metals (such as lead and mercury) and no release of volatile organic compounds; for baby and medical scenarios, we use "low-migration" brightening agents (migration amount ≤ 5mg/kg) to avoid migration after contact with the human body, ensuring usage safety; at the same time, we can adjust the type of brightening agent according to the base material type - direct brightening agents for cotton fibers and disperse brightening agents for polyester to maximize the brightening effect;

Core processing method: Immersion and pressing method - full-width uniform, deep brightening

The immersion and pressing method is the optimal process for achieving "uniform brightening of the entire base material". Through the three-step process of "immersion - pressing - curing", the fluorescent brightening agents deeply penetrate the base material fibers, avoiding uneven brightening in certain areas. The specific process control is as follows:

Immersion step: Completely immerse the spunlaced base material in a customized concentration of fluorescent brightening agent solution (concentration adjustable from 0.5% to 2%, precisely controlled according to the target white value), and use low-speed stirring (30-50r/min) to ensure uniform solution concentration; at the same time, control the immersion time (10-20 seconds) to allow the agents to fully penetrate the interior of the fibers rather than just adhering to the surface, ensuring the brightening effect is "from the inside out" and avoiding local loss of brightness due to subsequent friction;

Pressing step: Use a double-roller precision pressing machine, precisely control the roller pressure (0.3-0.5MPa) and speed (5-8m/min) to remove the excess brightening agent solution on the surface of the base material, ensuring the liquid-carrying rate is controlled at 60%-80% (adjusted according to the moisture absorption of the base material) - a too low liquid-carrying rate will result in insufficient brightening, while a too high rate may cause "dripping" leading to local excessive concentration. Through pressing control, the full-width liquid-carrying rate error of the base material is controlled within ≤3%, ensuring uniform brightening. Curing and shaping stage: A low-temperature hot air circulation drying process (80-100℃) is adopted to slowly cure the brightening agent, allowing the additives to form a stable bond with the fibers (such as hydrogen bonds and van der Waals forces), while avoiding the damage to the base material properties caused by high temperatures (such as the yellowing of pure cotton fibers at high temperatures). At the same time, the drying time is controlled (2-5 minutes) to ensure that the brightening agent is completely cured. For the wash-resistant type, after 10 washes, the whiteness attenuation rate is ≤5%, and the brightening effect is long-lasting and stable.

Three. Product advantages: Multiple characteristics combined, empowering the "appearance level + safety" dual demands

With diverse high-quality base materials and the immersion and padding fluorescent brightening process, our company's fluorescent brightening spunlace non-woven fabric has multiple core advantages, which can flexibly meet the demands of different fields for "high whiteness, high safety, and high adaptability", providing strong support for the upgrading of customer products:

Uniform and long-lasting brightening: Through the immersion and padding method, the entire base material is uniformly brightened, and the whiteness value can be precisely controlled at 85-95 degrees (customized according to customer needs), without local "white spots" or "dark areas". The curing process ensures that the brightening agent is stably combined with the fibers. For the wash-resistant type, after 10 washes, the whiteness attenuation rate is ≤5%. In outdoor usage scenarios (such as packaging materials), after 3 months of sun exposure, the whiteness change rate is ≤3%, meeting long-term usage requirements.

Safe and non-irritating: Environmentally friendly low-migration fluorescent brightening agents are selected, meeting the safety standards for infants and medical use. It has passed skin irritation tests (no redness or itching reactions), heavy metal tests (lead and mercury content ≤1mg/kg), and formaldehyde tests (≤20mg/kg), and can be safely used in infant hygiene products, medical auxiliary materials, and other close-to-skin scenarios, avoiding health risks caused by the migration of brightening agents.

Strong base material adaptability: Different base material characteristics (such as polyester, viscose, pure cotton, and bamboo fiber) are customized with brightening agent types and immersion and padding process parameters - pure cotton fibers focus on "natural bright white", polyester focuses on "wash-resistant brightening", and viscose focuses on "skin-friendly brightening", achieving "one base material, one solution", without sacrificing the original advantages of the base material (such as the skin-friendliness of pure cotton and the wash-resistance of polyester).

Balanced basic performance: After brightening processing, the core performance of the base material, such as flexibility, breathability, and tensile strength, does not significantly decline - no obvious creases after 100 folds, breathability maintained at 500-1500mm/s (adjusted according to the base material weight), and the tensile strength of the processed material is ≤5% lower than that of the original base material, ensuring that the product can enhance the "appearance level" without affecting the usage experience.

Four. Application scenarios: Covering multiple fields, assisting in the "appearance level and safety" dual upgrade

Our company's fluorescent brightening spunlace non-woven fabric, with the advantages of "diverse base materials + immersion and padding brightening + safety performance", has been widely applied in hygiene products, home textiles, medical auxiliary materials, packaging materials, and other fields, becoming the core support for the "appearance level upgrade" and "safety guarantee" of customer products:

Hygiene products field: Viscose / pure cotton / bamboo fiber base materials are selected, and natural brightening is achieved through the immersion and padding method (whiteness value 88-92 degrees), which can be used to make the surface layer of baby diapers, the surface layer of feminine hygiene products, wet wipe base materials, etc. The brightening effect is natural and not dazzling, and it is safe and non-irritating, avoiding discomfort to the delicate skin of infants and women. At the same time, the high whiteness enhances the visual cleanliness of the product.

Home textiles field: Polyester + viscose base materials are selected, and wash-resistant brightening is achieved through the immersion and padding method (whiteness value 90-95 degrees), which can be used to make curtains, sofa covers, towels, bedding, etc. The brightening effect is long-lasting, remaining bright after multiple washes, enhancing the "freshness" of the home environment. At the same time, the weather resistance of polyester ensures that the product does not yellow after sun exposure, extending the service life of home textiles. In the medical auxiliary materials field, we use all-cotton or viscose substrates and medical-grade low-migration fluorescent brighteners (with a whiteness value of 85-90 degrees) to produce medical gauze, medical wiping cloths, and surgical drape linings. The high whiteness makes it easier for medical staff to observe stains (such as bloodstains and drug residues), and it is safe and non-irritating, meeting the hygiene standards of medical scenarios and avoiding the risk of cross-infection.

In the packaging materials field, we use polyester substrates and high-weather-resistant impregnation and bleaching (with a whiteness value of 92-95 degrees) to produce gift wrapping cloth and high-end product lining cloth (such as for cosmetics and jewelry packaging). The high whiteness enhances the "high-end feel" of the packaging, and the wear resistance of polyester ensures that the packaging does not fade or lose its whiteness during transportation, protecting the appearance of the internal products.

V. Brand Commitment: Permanently Maintain Quality, Mutual Benefit and Win-Win

Since its establishment, Changshu Yongdeli Spunlaced Nonwoven Fabric Co., Ltd. has always regarded "sustainable quality" as the core of its development, integrating it throughout the production process of fluorescent brightened spunlace nonwoven fabrics, and safeguarding the "appearance level" and safety of customers' products with professionalism and responsibility:

Raw material end: We strictly select fiber suppliers and fluorescent brightener suppliers. Each batch of raw materials must provide quality inspection reports and safety certifications (such as SGS low-migration test reports for brighteners). After our company's re-inspection (fiber composition, brightener purity, heavy metal content) and confirmation of qualification, they can be used to ensure the safety of the source.

Production end: We are equipped with a professional quality inspection team and precise testing equipment (such as whiteness testers, washing resistance testers, skin irritation testers) to conduct real-time spot checks on key indicators such as the original whiteness of the substrate, uniformity after brightening, washing resistance, and safety. Samples of each batch of products are retained for future reference to prevent "uneven brightening" and "non-compliant safety" products from entering the market 

Service end: We provide customers with a full-process service from "demand communication - substrate selection - brightening scheme design (such as custom whiteness value, adjustment of washing resistance) - sample production - batch production - after-sales tracking". If customers have special requirements for the brightening effect and safety standards (such as baby care grade, medical grade), we can quickly optimize process parameters to ensure that the products precisely meet the actual application scenarios.

In the future, we will continue to be customer-oriented, deepen the research and development of fluorescent brightening technology (such as developing "fluorescent-free brightening" processes and more weather-resistant brightening solutions), expand substrate categories and application scenarios, and strive to become a supplier in the field of fluorescent brightened spunlace nonwoven fabrics that is "reliable in quality, flexible in customization, and professional in service". We will work hand in hand with customers to achieve the long-term development goal of "sustainable cooperation and mutual benefit and win-win", and jointly promote the innovative upgrade of the functional spunlace nonwoven fabric industry that emphasizes both "appearance level and safety".