Absorbing core is the key factor to determine the wearing comfort of diapers. This paper briefly introduces the innovation and development of diaper absorbent paper.

1.Rapid absorption of absorbing core

At present, both international and domestic brands, whether traditional fluff pulp absorbing core or new composite core, are constantly innovating processes to develop products that are thinner, more comfortable, have stronger liquid absorption capacity, have better reverse osmosis effect, and have no faults and lumps, so that there is no burden to wear.

For example, Kimberly Clark developed a diaper core, which is composed of three layers of sap and fluff pulp mixed core. The core thickness increases with the number of layers, and there is at least one longitudinally extending channel in the surface core to disperse urine. The liquid absorption speed is fast, which can well maintain the surface of diapers dry and breathable.

2.Intellectualization of absorbing core

Smart diapers are also in the process of development.

For example, Kimberly Clark's patent CN201480070386.1 discloses a urine odor control system for personal care products, which contains a substrate of activated carbon preparations and an absorption core of silver preparations.

Curiosity company in the United States also released a concept diaper, which puts the moisture sensor in the absorbing core of the diaper. When the sensor detects the change of moisture content in the diaper, it will send a text message to parents through app to remind parents to replace the diaper in time.

3.Thinning of absorbing core

One of the development directions of contemporary diapers is to reduce the addition of fluff pulp and realize a lighter and thinner absorbing core.

For example, a diaper of Hengan Group has upgraded its dual core technology. Its upper layer is an integrated woven core wrapped with dust-free paper and hot-air fluffy nonwovens, and its lower layer is a traditional fluff pulp core. The combination of the two cores greatly reduces the original absorption thickness. Moreover, the addition amount of SAP reached 65.00%, which can absorb 560ml urine at most. While increasing the liquid absorption, the core structure is not agglomerated and broken.

4.Functionalization of absorbing core

Functional absorbing core is still being developed, and some diapers also have certain sterilization, skin care and other functions.

For example, Hengan Group has invented a functional core, which can moisturize, sterilize, deodorize and other functions of diapers on the premise of improving the liquid absorption characteristics of diapers. The bottom layer of the core is the composite of the first water absorbing layer and the adhesive layer, the middle absorbing layer is the stacking and bonding of the first hot air nonwoven material layer, the second water absorbing layer, the second hot air nonwoven material layer and the third water absorbing layer (from bottom to top), and the surface layer is the hot air nonwoven material sprayed with antibacterial agent (the antibacterial agent is made of nano silver, green tea extract, honeysuckle extract, citrus extract, onion extract, etc.).

With the continuous improvement of people's requirements for diapers products such as light, breathable, hygienic and non irritating, the absorbing core of diapers will develop in the direction of diversification and integration, and the structure of absorbent paper is also constantly improving.