Airlaid in SAP applications
Currently SAP airlaid its super-absorbent, water retention capacity in agriculture, forestry, water retention areas, sanitary materials such as absorbent core widely used. Flexibility Airlaid air molding process is very suitable for different densities of fiber, powder molding uniformly mixed in any proportion. This provides a theoretical basis for the SAP applications in airlaid production. Here in the airlaid SAP application for a discussion.
1, SAP applications in air-laid in
Discussion 2.1 SAP add in the way in airlaid
①SAP fully mixed with the fluff fiber molding: This airlaid are relatively good in terms of the absorption speed, absorption capacity, but in the production process will result in the loss of SAP increased production costs. In the production process of the web surface there is a large part of the SAP would remain in forming mesh belt, on the one hand caused by SAP waste, on the other hand causes blockage forming mesh network with SAP will not only affect the web forming and to network with cleaning bring some difficulties. This way of adding SAP airlaid web surface due to a certain amount of SAP, SAP can not keep dry sex airlaid surface.
② join the SAP web core: this way to avoid the production process to add SAP SAP airlaid paper waste can be kept after the dry surface of the water. However, the gelation point of adhesion and hard water after SAP could easily lead to the phenomenon of the web punctured surface, can also cause inter-layer sliding action.
③ surface fibers within the middle is a mixture of SAP and fluff fiber: This add only way to avoid wasteful production of airlaid production process, keeping the surface of the web to overcome dryness and then wet, they can prevent coagulation interlayer adhesive and even sliding action. This is an ideal way to add SAP.
2, SAP Features
Capable of absorbing and retaining several times their own weight of the polymer material of the supremacy of thousands of times is called a water-absorbent polymer material referred to as SAP, SAP is a non-water-soluble polymer resin has a high water absorption capacity, under compression and can still retain the absorbed liquid.
① rapid absorption, the absorption rate is generally in 2-45sec.
② absorption capacity: water multiples high, reaching 120-170 times, solubility, gel strength after water drop.
③ water absorption ratio and speed: a multiple of the lower water absorption, water faster.
④ blend of water-absorbing agent is actually a resin having the common characteristics.
⑤ speed and particle size, the larger the particle, the longer absorption time, long saturation time.
2.2 SAP airlaid production should pay attention to several issues:
Mixed ①SAP and fluff fibers.
Whether in the actual production in SAP and fluff fiber mix is very important, and this is directly related to the performance of the product pipetting size and uniformity of aspiration, but also to avoid gel blocking and hard surface point punctured the web and prevent the interlayer sliding effect has an important role.
In SAP powder evenly mixed with the fiber before, be sure to keep the dryness of SAP, which directly affects the SAP metering, transport, dispersion and mixing of SAP and fluff fibers.
2.3 SAP on SAP's requirements:
Absorption time, absorption factor, viscosity, particle size is generally choose polyacrylate like SAP, its water absorption capacity, high water retention capacity, low cost manufacturing method is easy. Select the absorption rate in general: 3-6sec, water multiples: 120-170 times, particle size: 60-100 mesh, must have sufficient viscosity, high-bulk capacity: 10-17 times, water retention ability, and then wet a small, easy produce liquid back osmosis.
2.4 SAP amount of the airlaid
SAP maximum amount can be up in the air-laid in 55%, SAP airlaid amount in accordance with the general use of the product may be. If used for health, and underestimate the content of the pads and other absorbent core for SAP, 20-25%, if used as baby diapers, ***** incontinence products, agriculture, forestry, water retention, SAP dosage in: 30-35%.
2.5 SAP for fluff fiber requirements:
Requirements fluff fiber soft, fluffy and high fiber thick and long: 2.7-3.0tntn, low fines content, pad good integrity, reticular fibers evenly, network Rally for: 7 N or more, strong adhesion for SAP and so on. In actual production more suitable for GP, NF485 and other types of fluff pulp. With the further improvement airlaid forming process, I believe there are more inorganic fibers, organic fibers and powder applied to the production, develop more new products.
