There are many ways to improve the surface softness and overall softness of tissue paper. Appropriate selection and use of viscous agent and release agent can control the coating performance of the Yankee dryer, which is one of the most basic and important methods. Reasonable use of slurry addition,Spraying softeners with softeners or paper sheets is also an important method for papermakers to improve softness. Finally, in the tissue paper processing process,Among them, the use of creams and care agents has a significant effect on the production of high-grade tissue paper products. Which method to choose to improve toilet paper the softness depends on the user's requirements and production conditions.
1.Wrinkle and wrinkle chemicals
Controlling wrinkles is the most mature and basic way to improve softness on ordinary toilet paper machines. Understand the mechanics of the wrinkle scraper.Conditions (squeegee angle, squeegee inclination, squeegee extension, squeegee material structure, applied pressure, etc.) are important, but they are usually considered to belong to the patent scope of tissue paper production.
2.Adding Softener in pulp
The method of adding softeners in pulp has been used for more than 30 years. Mizoline derivatives are typical examples of softeners used in pulp.For example, its function is to reduce the bond between the fibers in the slurry. Simply add this softener to the slurry, it will change the fiber Surface properties reduce the bonding area between fibers and form a lower bonding force between fibers. Although this softener can be effective.It can improve the overall softness, but it will significantly affect the strength of the paper and reduce the tensile strength by more than 15%.Another softening agent added to the pulp is a fiber lubricant. The function of this kind of softener is by adding oily additives or waxy additives.It is added to the paper to reduce the friction properties of the fiber. By reducing the friction inside the paper, the overall softness is slightly improved. Generally speaking, lubricating softeners reduce the tensile strength of the paper by less than 10%. Their function is similar to fabric softeners, which can make the fabric.The feel is softer, but it will not significantly reduce the strength of the fabric. However, lubricating softeners improve the smoothness of the paper and make The paper feels smoother, so as to improve the surface softness. The newly developed softener technology in the pulp makes papermaking.Workers can control the loss of paper strength while achieving the required increase in overall softness and surface softness .New research results have enabled a toilet paper factory in China to use up to 50% of non-wood fibers to produce high-quality facial tissues.This is a considerable achievement. Using this kind of softener for adding in the pulp, the tensile strength decreases less than 10%.
Most softeners are applied by adding the softener to the slurry system. The range of joining positions is from the pulper to the slurry pump. The adjustment box or the head box is a frequently used joining position. The usual practice is to add the softener to the system at a further position, which will allow the softener to have more penetration and reaction time to the fiber, which will reduce more strength. In some situations
In this case, this effect is what people want, but in other cases it is not. It depends on the technical specifications of the final product. In the secondary fiber system, coatings and other impurities from the fiber may reduce the softness of the paper, which is another reason for the poor softness of the paper. In this case, the use of softeners containing penetrating and dispersing agents will improve the use of secondary fibers, but usually requires longer contact time with fibers. The softener is added to the single-layer slurry system. Generally speaking, the amount of softener added should be the most in the range at the beginning.
Lower the value, and then gradually increase the dosage. After each increase in the dosage, pay close attention to its effect on the peeling effect of the Yankee dryer. The maximum addition ratio can be determined according to the strength properties or the variation range of the peel performance of the paper from the Yankee dryer.
3.Softener for spraying paper
Softness is the main surface property of facial tissues and toilet paper sheets. The internal bonding of the paper is an important factor for the strength of the paper. Reducing the degree of fiber bonding on the surface of the paper can minimize the interference of the softener on the internal bonding of the paper and obtain the desired softness. Therefore, spraying softener on the wet paper web before drying can reduce the use cost, and the paper is resistant to While the tensile strength is slightly reduced, the surface of the paper is soft.Spraying softener on the paper before entering the Yankee dryer is a new technology to improve the softness of the paper. It is emphasized again that its role is to modify the surface of the fiber. By reducing the friction properties of the surface of the paper, the surface softness of the paper can be significantly improved. One advantage of softeners for spraying paper is that they are more cost-effective. The actual application effect in a paper mill shows that.The use of softeners for spraying paper instead of softeners added in the pulp can reduce the cost by nearly 50% and save more than US$100,000.A good side effect of using an appropriate softener for spraying paper is that it can improve the coating performance of the Yankee dryer, thereby improving the uniformity of wrinkles and improving the winding operation of the web. Some softeners also have film-forming properties. Because this softener is sprayed on the paper sheet close to the Yankee dryer, the creping process will be affected by the film-forming properties of the softener, and the softener has a mild effect. coating.The function of the modifier makes the Yankee dryer coating have better plasticity and wrinkle function. At this time, it has been seen that it has no effect on the addition speed of the viscous agent or the release agent. The effect of softener for spraying paper is mild and has good effect.It is worth noting that there is no bond between the fibers before the paper is dried, and the fibers rely on the cohesive force of the residual water in the paper to closely contact each other. Since the fibers of the paper are not bonded before entering the Yankee dryer, it is possible to affect the overall softness to some extent by spraying an appropriate softener on the surface of the paper. A suitable example is the softener used for spraying paper sheets in the mesh slot.Application on toilet paper former. An important issue to consider when using softeners for spraying paper is that the amount of paper lint produced at the creping blade may increase.If the wrong softener (generally those with strong debonding effect) is used, a large amount of paper wool can be produced. Please remember that the main function of softener for spraying paper is fiber modification, which can improve surface softness. Although it may slightly improve the overall softness, its use should be consistent with the goals of the papermaker. If the main purpose is to improve the overall softness, then the use of softeners added in the pulp is better than using Softener for spraying paper is more suitable.
4.Cream and care used in the process of tissue paper processing
Spraying softener during tissue paper processing is actually similar to spraying softener on the paper sheet before it enters the Yankee dryer, but its cost is higher, so why use this process? There are two main reasons , First, many toilet paper processors who buy large toilet paper rolls want to improve the softness of their products. For them, the process of improving softness can only be carried out during processing. The second reason is that in order to make the paper have certain characteristics, it is impossible to obtain these characteristics by other methods. To avoid confusion, "cream" and "care agent" must be defined. For our purposes, cream is an additive that can make toilet paper soft, smooth or silky. The care agent can be transferred from the toilet paper to the user's skin and provide skin care.Creams and care agents have some similarities in chemical composition. They often contain lubricants and waxy chemicals that can improve the surface smoothness of toilet paper. But the care agent also contains some components that the cream does not have. They are emollients and humectants, and have a good emollient effect. Emollients are oily chemicals that can replenish the oil content of the skin and help maintain the skin. To a certain extent, its effect is similar to that of a skin cream. Moisturizers are chemicals that help lock in moisture. Their role is to help lock in moisture in the skin and avoid dry skin.Cream is used to improve the surface softness of toilet paper, such as facial tissues and toilet paper. The care agent is more used on facial tissues, especially those facial tissues that are called "nose friendly" by the market. Such facial tissues are suitable for common cold and flu patients.
