With the continuous development of society, the continuous improvement of people's living standards and the continuous enhancement of health awareness, disposable sanitary products have been widely used in people's daily life. Among them, the market penetration of diapers continues to improve. Especially in recent years, diapers have developed very rapidly and the market competition is also very fierce. As one of the raw materials of diapers, PP side tape witnessed the development of diapers. Today, let's take a look at side tape.
PP side tape is an adhesive tape that is convenient for the fixed position of diapers and is set at the back waist of diapers. After the diaper is worn, it can be glued to the front waist to connect the front and rear sides of the diaper into a whole, forming a "pants" type.
The current side tape includes the bottom film and lining film attached to the back waist of diapers. The bottom film and the lining film are mainly formed by hot-melt bonding of the plastic film and the bonding layer. Among them, the plastic film is generally made of PE and PVC materials with certain strength and thickness to ensure that it has the property of repeatedly tearing off the front waist sticker.
However, the hot melt adhesive on the adhesive layer of the bottom film can easily penetrate into the surface of the plastic film, causing infection of the baby's skin. In addition, the front waist of diapers is usually made of non woven fabric. When it is torn from the front waist sticker, the non woven fabric is easy to be adhered by the hot melt adhesive on the lining film, affecting its service life. Therefore, there is still room for improvement.
PP side tape is composed of PP casting film, CPP, BOPP or OPP and hot melt adhesive. In the past, side tape products required multiple equipment for processing. That is to say, in order to complete the processing of the product, it needs a separate squeegee, Slitter, coiler and laminating machine. In addition, the past process belongs to the off-line adhesive scraping composite process. Due to the need for multi-stage process processing, it is prone to quality problems, consuming human and material resources, resulting in increased costs.
The patent No. cn201010618492.2 discloses a left and right waist stick bonding device on a diaper production line, which comprises a press bonding roller shaft. The press bonding roller shaft is fixedly connected with an eccentric sleeve, and a ring sleeve is movably connected around the eccentric sleeve through a bearing. The inner ring of the ring sleeve is made of steel and the outer ring is made of elastic material with certain hardness. During non press fitting, the ring sleeve rotates with the press fitting adhesion aid roller shaft and its eccentric ferrule. When the eccentric position of the eccentric sleeve and the adsorption roller jointly exert pressure on the diapers and their left and right waist stickers, the ring sleeve can rotate with the adsorption roller and synchronize with the linear speed of the adsorption roller and diaper products. Even if it cannot be synchronized, the elastic effect of the outer ring of the ring sleeve can jointly overcome the tensile deformation of the products, folds and skewness of the left and right waist stickers, The qualified rate of the product is improved. However, this technology has high production cost, poor stability and low production capacity, so there is room for further development.
The birth and development of diapers reflect the continuous progress of modern society, the continuous improvement of people's living standards and the continuous development of production technology. Nowadays, diapers are more and more widely used. Understanding the relevant knowledge of PP side tape is conducive to better use of diapers.