The forming process of non-woven materials for baby diapers needs the cooperation of multiple processes. In order to let readers have a deeper understanding of the general operation of the whole process. Next, take the application of super Imitation cotton nonwovens in baby diapers as an example, and explain one of the manufacturing processes.

Carding process of super Imitation cotton nonwovens for baby diapers

Mixed open treatment is to loosen single or mixed fiber raw materials, dissociate large fiber blocks and fiber clusters, and play the role of various fiber components in the mixed raw materials. The purpose of this treatment is to mix evenly, make the fiber fully open and avoid fiber damage as much as possible. Due to the limitation of test conditions, the test adopts the method of manual pulling and loosening.

Carding process is the key production process of nonwovens' dry web forming. Double carding consists of two carding machines, one placed in front of the other, and the final fiber web is formed by the superposition of two layers of fiber web; The double cylinder is a carding machine with two cylinders on it. The small one is the chest cylinder and the large one is the main cylinder; The double doffer is the main cylinder, followed by two doffers combing fiber webs. After the first carding machine, the cross laying machine is placed, mainly to improve the mechanical performance in the CD direction, and then draft the fiber web through the drafting machine to play a messy role.

The basic parameters of carding machine are: frame width: 260mm; The diameter of cotton feeding roller is 57mm; The working diameter of stabbing wheel is 68mm; Cylinder working diameter 315mm; Number of cover plates 12: doffer working diameter 168mm; Draft ratio 105.6 times; Overall dimension of the machine 1897x566 × 1072(mm).

Hydrophilic finishing of non-woven materials for baby diapers

The surface hydrophilic finishing process can be divided into impregnation method, dip rolling method, spray method and foam finishing method.

Impregnation method: under the action of a certain tension, rotate the nonwoven sample evenly and cover the runner of hydrophilic agent. When the nonwovens are matched with them, the hydrophilic reagent on the runner surface is transferred to the nonwovens. The post-treatment of sanitary nonwoven covering materials generally adopts impregnation method.

Dip rolling method: soak the fabric in the finishing solution, and then roll the excess finishing agent. The dip rolling method is one dip rolling or two dip rolling. The liquid rate of nonwovens treated by this method is generally between 50 ~ 90%.

Spray the hydrophilic finishing agent evenly on the surface of the nonwovens under certain drying conditions. This method is characterized by high liquid carrying rate, which is 70 ~ 100%.

The foam finishing process is to pump the foam finishing agent to the rolling point of the jaw. When the cloth passes through the rolling chamber, the foam is extruded, so that the finishing liquid is dispersed on cloth and cloth.

Other methods: transferring the finishing agent by using brush, smooth glass plane and other methods can effectively reduce the liquid carrying rate. These liquid feeding methods can reduce the liquid carrying rate to 30% or less.

Finally, the hydrophilic agent concentration, drying temperature and drying time were designed. Different hydrophilic agent concentration will affect the hydrophilic finishing effect of the final product, thus affecting the final liquid penetration performance of baby diapers. Therefore, hydrophilic agent concentration is the most important design parameter. Higher drying temperature and longer drying time can better combine hydrophilic agent with fiber material, so as to achieve the best hydrophilic effect.