What Is Fluff Pulp?

After bleaching, extract the organic solvent extract and other wood pulp and straw pulp.

Fluff pulp

This entry lacks an overview map . Supplementing related content makes the entry more complete and can be upgraded quickly. Come on!

After bleaching, extract the organic solvent extract and other wood pulp and straw pulp.

Is a kind used to produce various

According to the use of fluff pulp, the properties of fluff pulp can be summarized into 3 parts, that is, the general properties of fluff pulp, the properties of fluff pulp boards, and the properties of fluff. The general properties of fluff pulp include whiteness, organic solvent extract, fiber length and its distribution; the properties of fluff pulp board include quantitative, tightness, burst resistance, moisture; the properties of fluff include specific volume, moisture absorption time and moisture absorption speed Moisture absorption.

Compared with ordinary pulp board, the fluff pulp board has longer fibers and the strength of the fiber itself is better. When producing fluff pulp products such as sanitary napkins, it is easy to dissociate into single fibers on the fluffing machine, and less dust is generated during processing. The general requirements for fluff pulp products are good water absorption and rapid diffusion; the fluff pulp fibers must have high whiteness, the fibers must be soft, have a certain elasticity and good core pad integrity, and meet the specified hygienic indicators.

Organic solvent extract

The content of organic solvent extracts in softwood materials is high; the content of organic solvent extracts in hardwoods is small. Organic solvent extracts from coniferous wood are mainly abietic acid, terpene compounds, fatty acids and unsaponifiables; organic solvent extracts from hardwood are mainly fatty acid and organic solvent extracts from non-wood raw materials are mainly fats and waxes. . Different raw materials and different types and contents of organic solvent extracts have different effects on fluff pulp quality.

Resin-based ingredients

According to the present experience of fluff pulp production and the introduction of relevant data, it is believed that high resin content will significantly affect the absorption rate and capacity of fluff pulp, but alkali pulp can easily remove softwood resin, so it is now used The softwood fluff pulp produced by the chemical method has very good absorption performance; although the content of the organic solvent extract in the hardwood raw material is low, it contains resin components that are not easy to remove. These resin components remaining in the pulp will hinder the absorption of liquids. Therefore, the quality of hardwood fluff pulp is worse than that of softwood fluff pulp. In general, the resin composition has little effect on the absorption performance of chemical fluff pulp, while the quality of chemical mechanical fluff pulp is greatly affected by the resin. Organic solvent extracts from non-wood raw materials are also very easy to remove in pulping, so organic solvent extracts from non-wood raw materials are not the main problem preventing non-wood raw materials from making fluff pulp.

Plant fiber raw materials

As is known to all, the raw material of plant fiber mainly contains chemical components such as cellulose, hemicellulose and lignin, among which it is required to completely remove lignin in pulping, and hemicellulose is partially retained according to actual conditions. Cellulose and hemicellulose in pulp fibers are hydrophilic substances, while hemicellulose molecules contain more free hydroxyl groups, which makes pulp fibers highly hydrophilic, which makes it easy for the fibers to swell and increase fibers. Flexibility. During paperboard making and dehydration drying, the fibers are compressed under the surface tension of water, so that free hydroxyl groups form hydrogen bonds, which gives the paper and paperboard a bonding strength. However, the use of fluff pulp is different from ordinary cardboard or pulp board. The first step in the use of fluff pulp is dry raising. Only after raising can different fluff pulp products be produced. This requires the combination of fluff pulp pulp board fibers. Weak, the bulk of the fluff pulp board should be large, only in this way the fluff pulp board is easy to fuzz. Therefore, the proper removal of some hemicellulose during the production of fluff pulp is advantageous for the use of fluff pulp. However, this will inevitably cause problems such as increased chemical consumption, reduced pulp yield, and increased costs. Therefore, raw materials with high hemicellulose content are not suitable for the production of fluff pulp. This is why fluff pulp is mostly produced from softwood materials. the reason.

Fiber composition and fiber morphology

The length and strength of the fluff pulp fibers have a great impact on the performance of the fluff pulp. It is generally believed that the longer the fiber length, the greater the strength of the fiber itself, and the greater the thickness of the fiber, the greater the thickness of the fluff pulp pulp board copied, and the easier it is to fuzz. The fiber is less damaged during dusting and less dust. The fluff pulp after the dusting has large gaps between the fibers after forming, good liquid absorption performance, and good core pad integrity. In addition to fiber morphology, for the production of fluff pulp from non-wood raw materials, the influence of miscellaneous cells must be considered. Generally, the content of heterocells in coniferous materials is 5% -10%, the content of heterocells in hardwoods is 20% -40%, and the content of heterocells in non-wood fiber materials is 35% -54%. These hybrid cells are very weak by themselves and are easily broken during the pulping process, which is the main reason for the loss of hair and powder of cultural paper. According to the existing research conclusions and papermaking practice, it is found that the paper or paperboard produced by the pulp with a large amount of mixed cells has greater tightness, and the more fine components in the fluff pulp, the greater the tightness of the fluff pulp pulp board copied, and The higher the breakage, the less likely it is to fuzz.

It is precisely because the fluff pulp board is required to have a relatively high bulk thickness, low burst resistance, easy raising, and good absorbency. Therefore, nowadays fluff pulp is mostly produced by coniferous wood. If the production of fluff pulp from non-wood raw materials is feasible, it is necessary to fully consider the effect of the content of heterocells on the properties of fluff pulp.

The so-called superstructure refers to the details of raw materials beyond the resolving power of ordinary optical microscopes. Different raw materials, different cells of the same raw material, and different details on the cells have different superstructure characteristics. The influence of superstructure on the properties of fluff pulp is also a factor to be considered when producing fluff pulp. Research and practice have proved that the absorption performance of fluff pulp is more sensitive to the beating degree of pulp. In the production process of fluff pulp, due to cooking, washing, bleaching, concentration, or the hydraulic disintegration of commercial pulp boards and dry damaged paper, it is inevitable The ground is subject to mechanical forces, so the fibers will more or less microfibrillate, exposing more free hydroxyl groups, which will reduce the bulk of the fluff pulp and increase the fiber bonding strength, which is not conducive to the fluff pulp board fuzzing. . Therefore, when selecting the raw material for fluff pulp, the greater the thickness of the fiber cell wall and the fine fiber winding angle, the stiffer the fibers, and the worse the binding force, the thicker the fluff pulp board caused by copying, and the more energy needed for fluffing. Low, which is advantageous for copying bulky fluff pulp boards.

Coniferous wood is the best raw material for producing fluff pulp, but China's forest resources, especially coniferous wood resources are scarce. Therefore, the development of new raw materials to produce fluff pulp has important practical significance for China. It should be noted that when selecting raw materials, the properties and processing properties required for fluff pulp should be fully understood, and the chemical composition, cell composition and superstructure of the raw materials should be analyzed to determine the feasibility of producing fluff pulp.

The density of the liquid absorbent layer of a sanitary napkin is an important indicator in production. Low density can increase the absorption rate and total absorption of liquid, but it can reduce the diffusion rate of liquid and increase the anti-humidity. Increasing the density can help the liquid to diffuse.

For the multi-layer design of the absorption layer, the principle of using large void material on top and small void material on bottom is beneficial to the diffusion and absorption of liquid to the small void material, and it can reduce the back osmosis.

The multifunctional liquid-absorbing composite material has a fluffy liquid-absorbing layer, a liquid-transmitting diffusion layer and a high-density liquid-storing layer in one material.