Hot-air nonwoven fabric is a kind of dry heat-bonded nonwoven fabric. After the fibers are carded and formed into a net, the hot air on the drying equipment is used to penetrate the web to form heat and bond. Hot air non-woven products have features such as high bulkiness, soft hand feeling, good dryness, and good air permeability. The thin products made with composite fibers have large gaps between fibers, and liquids can quickly penetrate through the fiber gaps to absorb when used. Layers, therefore, are widely used in disposable products such as baby diapers, adult incontinence pads, feminine hygiene products, as well as napkins, bath towels, disposable tablecloths, etc.; thick products are used to make cold clothes, bedding, baby sleeping bags, mattress, sofa cushions and so on. High-density hot-air nonwoven products can be used to make filter materials, sound insulation materials, shock-absorbing materials, and the like. Compared with spun-bonded nonwovens and hot-rolled non-wovens, the thickness of hot-air nonwovens is greater, and it is more difficult for liquids to penetrate the surface layer to seep back to the surface layer. Therefore, the use of hot-air non-woven fabrics as the surface layer of hygiene products will be even greater. Dry and comfortable.
 
The application of hot air nonwovens to the surface of hygiene products has been led by the Japanese and Korean markets in the past two years. Due to its excellent performance, it has rapidly swept the world. Therefore, the scale of hot air nonwoven fabric manufacturers is rapidly expanding, and their performance on hot air non-woven fabrics research is also deepening. The increase in thickness studied in this paper is one of the most studied by many manufacturers. With the continuous expansion of the domestic personal hygiene products market, the use of hot air non-woven fabrics in personal hygiene products is on the rise and the outlook is very promising. Procter & Gamble, Kimberly-Clark, Kao, Unichai, Hengan and other well-known domestic and foreign sanitary product manufacturers conducted comparative analysis of hot-air non-woven fabrics. The results showed that the thicker and more fluffy fabrics had better liquid penetration and return permeability. The better, the more dry and comfortable. Non-woven fabric manufacturers to improve the thickness, most from the fiber selection and proportioning, carding process adjustments, hot air process adjustments and other aspects of improvement, but due to the number of factors affecting the thickness of non-woven fabrics, coupled with the production capacity is tight, Therefore, the effect of improving the thickness is not ideal.
 
This article focuses on the research of the non-woven fabric production process, discusses the influence of the production process on the thickness of the non-woven fabric, and improves the thickness of the hot air non-woven fabric by adjusting the cooling degree of the combing disorder and the draft speed difference to ensure the same quality of the non-woven fabric produce more hygiene products. At present, it is one of the core competition contents of non-woven fabric manufacturers to increase the thickness without increasing the surface density of nonwoven fabrics.
 
Experimental results
According to the test results and analysis can be drawn
 
(1) By increasing the number of fibers in the transverse direction by increasing the combing disorder, the instrumental test thickness and loft of the hot air nonwoven fabric can be improved.
 
(2)Air-cooled air-cooling is more conducive to increase the thickness and bulkiness of the testing of hot-air nonwoven fabrics, and the lower the cooling temperature, the faster the fiber setting, the smaller the tensile deformation of the web, and the greater the thickness and bulkiness of the instrument test. Easy to maintain.
 
(3) Reducing the cooling roller draft speed difference of the hot stove can make the instrument test thickness and fluffiness of the hot air non-woven fabric better; and the draft speed difference of the hot air stove-carding machine, the draft speed of the take-up roller-cooling roller difference The instrument has less influence on the thickness and bulkiness of the test.