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Nonwovens

As technology improves and updates shoe shoe materials, shoe manufacturing process has been developed to gluing, injection and mechanization and automation direction, a lot of glue applied to replace the traditional hand-stitched footwear technology, viscose already become one of the major footwear categories molding process.
Compared with the method of sewing, bonding SYSTEM shoes high production efficiency, the general method of sewing several times, even several times, in particular for multi-color, a variety of decorative, non-woven variety of styles for producing the leather shoes, sewing law simply can not be compared with the bonding method. Secondly, the legal shoes equipment viscose small investment, a device can produce a variety of shoes; for sewing method to produce a shoe need multiple devices. Thus, as in recent years, a variety of high-performance adhesives continue to emerge, the proportion of bonded substantial increase in the legal shoes footwear, some even completely without sewing footwear manufacturing.
We found that in the case of the adhesive is determined, the operating techniques and methods are bonded decisive factor in the success or good or bad, in which coating method, layer thickness, open time, bonding pressure, ambient temperature and humidity control, etc. is extremely important. In dealing with a good surface to be coated with sticky adhesive, coating uniformity requirements, fully immersed into the air as much as possible to reduce the thickness of the layer of general 0.05mm ~ 0.25mm.
At present, the shoe, the amount of domestic and foreign enterprises most of the fastest growing non-woven fabric with a binder for hot-melt adhesives, hot melt adhesives commonly divided into two categories, polyamides and polyurethanes.
For example, when the lasting polyamide hot melt adhesive, the polyamide in the molten state due to a relatively low viscosity, good flow properties, thereby facilitating the glue and adhesive. Polyamide film tough but not brittle, and the excess glue can be used repeatedly. Such quick-setting type adhesive belongs, fast curing, adhesive seam elasticity is high, with almost all of the uppers, shoe material adhesion. Therefore, these can be widely used in hot melt adhesive bonded natural leather, artificial leather and synthetic leather, etc., and used to make with Baotou, bandages and the like. This temperature varies depending on the use of hot melt adhesives used in the process varies, generally 150 ℃ ~ 180 ℃.
While the polyester hot melt adhesive in the non-woven imitation leather shoe during processing, the polyester hot melt adhesive is heated to be melted in the first storage tank to melt, and then the melted glue from the tank to the heating of the nozzle by a metering pump and by pressure bonding glue sprayed onto the soles, inner soles and finally underpinning pressurized can. From spray coating → → → curing adhesive, the whole process takes only ten seconds, effects, are better quality, more advanced than ever with the bonding process neoprene. Production proved bottom shoes polyester hot melt adhesive bonding, after repeated flexing 75,000 times will not open plastic.
Spewing is one of the necessary raw materials protective reinforcement material. Under normal circumstances, the main raw material Spewing fiber, in which ordinary 6.7dtex long hollow polyester fiber as the main body, with a certain amount of the same size three-dimensional crimped fibers treated with silicone oil if more add some three-dimensional crimp hollow polyester, it can improve the smoothness degree, improve the feel, improve product quality. Various fiber ratio is directly related to the quality and cost of the product, the manufacturers can develop ratio according to their own circumstances, and adjust, if necessary, a certain percentage of incorporation crude polyester, play a supportive role skeleton is conducive improve resilience.
In addition to fiber species, quality and processing methods and conditions, the most important factor is the quality of the adhesive Spewing therefore Spewing adhesive used is also an important development in the field of branched polymers. Spewing adhesives Spewing plays an important role in the production process, which directly affect the quality of the product. Currently, domestic enterprises Spewing commonly used for vinegar C adhesive binders, solid acrylic emulsion adhesives.
Based on production experience, vinegar C mist spray adhesive using the most appropriate. This web is not easily damaged and uniform surface coverage, the glue on the web is generally controlled by the depth of penetration of 60% to 70% of the thickness of the flakes, the intermediate fiber layers can also be bonded to improve the peel strength. Gum use of non-hydrophilic, so that after curing properties of the finished good washing after washing will not aliasing distortion, not loose, dried naturally restitution. It should be noted that the relationship between the amount of glue to the hard and soft, feel, flexibility, strength, permeability and other properties of the finished product, spray more product stiff, poor flexibility; spray less adhesion between the fibers is poor. Therefore, the amount of solid content and adhesive glue depends entirely on the product quality requirements.
In the production of polyester Spewing binder speed jet through the nozzle, cut into tiny droplets of the dispersion sprayed polyester adhesive must therefore have excellent mechanical stability, otherwise the emulsion breaking will be clogged nozzles. Therefore, mechanical shear stability is an important indicator of the adhesive, is particularly noteworthy.
Total polyacrylate emulsion good adhesive properties, easy construction, its high Spewing product hardness, resilience and strong permeability big, strong adhesion, water resistance, in Spewing production applications are relatively high.
It should be noted that the cotton adhesive itself can directly affect the performance of the quality Spewing, such as feel, elasticity and the like. Taking into account the technical and economic total polyacrylic ester monomer emulsion adhesive Lord should choose vinyl acetate, having a glass transition temperature of 20 ℃ ~ 25 ℃.
Further, in the production Spewing process, the raw materials used are mainly separate synthetic staple fibers, so that not only requirements for Spewing binder fibers have good adhesion, and must have good mechanical stability and dilution stability.
No matter what kind of material used as a fabric, in order to improve the adhesion of clothing quite wide, generally require the use of materials as a feel good lining fabric production. Interlining adhesives usually choose hot melt adhesive. Currently, the type of hot melt adhesive in the domestic market are more representative of the product is a polyethylene acetate - vinyl acetate copolymer systems, polyamide, polyvinyl chloride and the like.
Hot melt adhesives based on solvent resistance, washability, adhesion and other characteristics can be divided into sham binder and fully bonded by two. The former unit bond is weak, the lack of resistance to dry cleaning and washing, with easy paste with iron and other features. Its main purpose is to rationalize the sewing job, ethylene - vinyl acetate copolymer fall into this category. The latter units strong adhesion, good water resistance, resistance to dry cleaning, the product used for coating a large area of permanent adhesive sheet, repeatedly washed with easy peel-curing property is excellent, polyamide, high density polyethylene belongs mortgage this category.
Interlining with a body of hot melt adhesive is a thermoplastic resin, which is heated and melted, cold coagulation, having adhesiveness. These resins without considering their common use of their characteristics, can produce a variety of different properties of hot-melt adhesives.
When selecting the type and parameters of hot melt adhesives, needs depending on the type of fabric and interlining fabric, material, structure, quality and fabrics after finishing way to consider and decide on the process parameters of hot melt adhesives, and in accordance with various coating methods to select the technical parameters of hot melt adhesive. Furthermore, the choice of interlining, the adhesive should also be sewn aspects and consumer performance considerations, it is critical bond strength and feel. You also need to consider the type of low-temperature processing, heat flow characteristics, adhesion, resistance to washing, and prices.
Use the sewing stage after bonding interlining, product feel Rouran, beautiful body. It depends on the fabric and lining fabric bonding temperature range, and melting characteristics of hot melt adhesives. Bonding conditions beyond the scope of the problem of leaking or bonding strength occurs on the back; even if certain processing conditions, different materials also need to adjust the bonding temperature and pressure. In addition, since the difference pressing machine conditions will result is different, and therefore must be tested before use before hot fusion.
From the finishing process, the dry process is a thermal fusion adhesive powder or a film coated on a fabric, a wet slurry, or a hot-melt adhesive to melt the coating on the fabric. Coating processing is done on a single device, is divided into semi-finished fabric, coating, drying or baking sintering, to receive the amount of squaring, and rolling five steps. Currently, the coating bonded interlining processing methods, the application of dry powder point the most widely followed by dusting and wet slurry point method. Although only a very small portion of the fiber coating interlining coating process, but its production speed, superior product performance and other production characteristics of the preparation for it brings good prospects for development.
In the electrostatic flocking printing process, the adhesive is applied by a blade-type uniformly coated on the surface of the nonwoven fabric. Currently imports flocking machine for domestic use, in most cases, twice sizing process, and made homemade flocking machines are generally used once sizing process. In the production of these electrostatic flocking machine printing flocking products, the original must be transformed into a sizing device may have a certain pattern of the rotary metal roller, an adhesive under pressure via the rotary screen mesh drain printed onto the non-woven cloth. Therefore, when used in electrostatic printing flocking process, quality problems often occur following general electrostatic flocking.
The first is a small mesh, easy to produce blocking network phenomenon, frequent forced outages to clean the mesh, in addition, after the binder were missing on a non-woven fabric, often in front of flocking and drying to produce a small amount of "flow collapse." phenomenon, so the pattern edge sharpness decline, especially in flower sharp corners.
Based on this, after passing through several start-up study found that electrostatic printing flocking adhesive addition to the general electrostatic flocking adhesive properties, but also must have the following five special requirements. First, the adhesive must have a higher twist and thixotropy. Twist should generally be in 30pa · s ~ 35pa · s or so, at room temperature without any "flow collapse 'phenomenon; the second is the adhesive must have a higher tensile strength and body with fabric adhesive strength fluff; three the adhesive must have a viscosity with shear rate of decline as quickly as possible rheological properties to ensure that the adhesive has a high viscosity though; Fourth, the binder emulsion to a fine particle size and uniform emulsion stability especially good mechanical stability to the extent possible, the emulsion formation time to be longer appropriate; five adhesive must be absolutely clean and free of any mechanical impurities.
In addition, for no end of cloth flocking process, the need for adhesive attachment set, easy to peel the adhesive deposition until after the device. Inasmuch as the backing plate must support, and with the flock layer movement, into the oven baked, cured release film, the actual production, you must cycle operation. After curing the adhesive layer is formed and must also be easy to peel off the backing plate, it is generally the material is not acceptable. For these two problems, the general circulation of the conduction band in the way of surface coating, and then peel off the adhesive with silicone solutions to basically be able to meet the requirements.
In addition, as a non-circular bottom cloth flocking conduction band, technical modification capacity and quality performance is higher, must have good flatness, non-deformation, high temperature, good tensile strength and other characteristics, and are coated with silicone pro attached sex is better.

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