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In the hot summer days, people want to be able to wear them cooler, so even wearing a shoe cover requires "cool", and non-woven shoe covers are in line with this requirement. The non-woven shoe cover has good breathability, so that even if the shoe cover is worn in summer, it will not feel hot. Non-woven shoe covers are very comfortable to wear, but do you know how it is shaped? What is its craft? Below I will briefly introduce you to the two manufacturing processes of the non-woven shoe cover.
1. Non-woven shoe cover porous coating process
The most common manufacturing method for the production of porous membranes for filtration is casting. The process is to first disperse the vinegar (such as nitrocellulose) in a suitable solution, called a sol. Add a "porogen" substance to the mixture. The material has a very high boiling point and is insoluble in the vinegar. The prepared solution is poured on the surface of the glass to form a uniform thin suction, and then under strictly controlled conditions. The solution is evaporated. As the solution is reduced, the concentration of the pore-forming substance increases until the solubility of the polyester begins to affect. At this point, the original homogeneous sol begins to change into a gel. When appropriate, the formed film is formed. It is sent to the polycoolant (usually water), so the pore-forming substance and the solution are removed. Now the gel becomes the torsion film of Degu: In addition, the gel can be used to completely lose the solution and the non-dehydration. Dissolving solution, this process is called the thousand method. The formed hard film is a high-porosity colloidal structure. Because of the wide variation of the casting solution and the manufacturing conditions for controlling the gel structure, it is necessary to make a semi-permeable twist film. Craft is the most popular method.
The factors affecting the porosity and pore size of the film are extremely complex. The polyester used to make the film filter must undergo a phase transfer from the sol to the gel. Generally, polyesters have a relatively high relative molecular mass. The nitrocellulose home is a typical ridge suitable for making a torsional membrane filter. A large amount of artificial polyester can be used to make top sputum filter materials, such as polyamine (nylon), acrylic resin, polyacetamide, aromatic or aliphatic polysulfide poly. For each type of food, it must be used. Suitable solutions and pore forming materials. The choice of solution and pore forming material depends on the polarity of the poly 0. Weakly polar polyesters, such as acetate, require weakly polar solutions such as acetone. The strong polar vinegar needs to use a strong polar solution, such as D drunk or drunk. For non-polarized polymerization, it is necessary to use a non-polar solution such as diethyl ether. In any case, the solution must be low in boiling point so that it can be swallowed quickly during the casting process. The added pore-forming material must have a high boiling point in order to ensure that its evaporation rate is much slower than that of the solution. The polarity of the pore-forming material must be stronger than the polarity of the solution, which has a negative effect on the solubility of the vinegar. However, the polarity should not be too strong, otherwise it will cause the two to settle immediately. The concentration of the pore-forming material and its polarity will affect the properties of the film produced by the casting process.
Second, non-woven shoe cover spunlace technology
The spunlace process system can be roughly divided into three major systems, namely the network forming system, the hydroentangling and water treatment circulation system, the drying operation and the finishing system. The network forming system mainly has dry-laid and wet-laid processes; the spunlace reinforcement system mainly consists of flat net water and round drum water; the drying system is round and hot air-through and flat net drying operation box. Large categories, water treatment and water circulation systems are divided into two categories: synthetic fiber filter system and cotton filter system.
The water side method of non-woven fabric production and processing can be subdivided into five systems: (1) into a network system. (2) a hydroentanglement system. (3) Water treatment and water circulation system; (4) Finishing and winding system; (5) Process parameter control system (PLC program control). The spunlace process uses a high-pressure (highest time 250*10`PeK) fine water needle to continuously impact the web, and the amount of fiber per unit area is large, and is not affected by the arrangement direction of the fibers and the moving direction of the web. . The hook of the needle-punched reinforced needle of the dry non-woven fabric is perpendicular to the fiber arrangement, and the direction of the fiber web movement is the same, and the fiber effect is best, and the fiber is easy to slip off, which affects the efficiency of the needle. There is a significant difference between the hydroentanglement process and the consolidation mechanism of the needle-punching process. During the jet-spraying process, the high-pressure water continuously punctures the fiber web, and a part of the fiber is brought from the surface to the bottom of the net under the action of water, when the water needle passes through After the fiber net, it hits the rest of the net. When the water column rebounds to the opposite side of the fiber net, the fiber net is subjected to the actual multi-directional water column. Therefore, in the whole water conservancy process, the fibers in the fiber net directly hydrocede and support the water needle. The double-action of the rebound of the net water column forms irregular entanglement reinforcement in different directions.