A kind of method for producing non-woven fabrics that uses hot blast and products thereof
The present invention relates to a kind of method for producing non-woven fabrics, be meant a kind of method for producing non-woven fabrics that uses hot blast especially, the invention still further relates to a kind of hot blast Nonwovens that this method of use is produced, it has the advantage of high loft, high water-permeability, highly-breathable, dry and comfortable property, flexibility, is suitable for the surface of the series products of cotton wool, paper diaper.
In the prior art, be suitable for the employed Nonwovenss of surfacing such as cotton wool, paper diaper, the method that adopts the hot pressing running roller is arranged, generally be to use face wheel or engraving flower running roller for making one.On making, this traditional hot pressing wheel method is by the heat pressure adhesive of two or several hot pressing wheels, fiber is combined with each other, and becomes the hot pressing Nonwovens.
Yet this made in a conventional manner hot pressing Nonwovens is because of the thin no thick sense of quality, shortcoming such as is easy to bleed back, the surface is dry and comfortable inadequately, feel and flexibility are not good.
Therefore the purpose of this invention is to provide a kind of method for producing non-woven fabrics that uses hot blast, it need not pass through the hot pressing running roller, no matter face wheel or engraving flower running roller are pressed combination, also combine without chemical agent or hot glue stick, but use hot air circulation, utilize the hot melt of fiber, make fiber in the web and fiber form non-woven because of the relation of hot-air is together with each other.
Another object of the present invention provides the hot blast Nonwovens of a kind of tool high water-permeability, gas permeability, dry and comfortable property, and improvement is generally used at baby paper diaper, cotton wool ... etc. the shortcoming of the embossing Nonwovens of surperficial diafiltration material, to promote the operating characteristic of product.
The objective of the invention is to reach like this, earlier a fibrous raw material is made fiber web through the moulding of the combing effect of a carding machine or specially-shaped machine, then this fiber web is delivered in the hot air apparatus, make the hot blast of hot air apparatus penetrate this fiber web, low-melting fiber in the fiber web, be subjected to the effect of the hot-air of this hot air apparatus and blast and make its fibroreticulate surperficial low melting point composition fusion, make between fiber and fiber to stick together mutually, and make a hot blast Nonwovens with high loft, high strength, softness.
The hot blast Nonwovens that uses the inventive method to produce has the following advantages:
1. flexibility: skin-friendly and comfort are arranged;
2. thickness is arranged: have more thick texture than general embossing Nonwovens;
3. good air permeability: be suitable for subtropical climate; And be different from general material, have sultry sensation during use;
4. permeability is good; Prevent to bleed back, allow going under the flow liquid, on do not come, effectively prevent to bleed back, keep dry and comfortable top layer, surface.
Below with reference to accompanying drawing, the present invention is further described, wherein:
Fig. 1 is that schematic flow sheet is made in a preferred embodiment of the present invention, includes two cycling hot wind wheels in the hot air apparatus.
Fig. 2 is a second embodiment of the invention, and the mode that adopts a plane to carry has only hot blast wheel.
Fig. 3 is a third embodiment of the invention, adopts hot air circulation about in the of.
The present invention is in the selection of fibrous raw material, the meldable fibre that comprises single composition, as polypropylene (PP), polyethylene (PE) fiber, or it is outer for low melting point composition internal layer is two composite fibres of forming of high-melting-point composition, as polypropylene (PP)/polyethylene (PE), polyethylene terephthalate (PET)/polypropylene (PP), nylon (Nylon) 66/ nylon (Nylon) 6, polyethylene terephthalate (PET)/polyamide fiber fibers such as (COPET).
The present invention also can be with the demand of product performance with low melting point meldable fibre and other fiber such as artificial fibre (Rayon), polyethylene terephthalate (PET), nylon (Nylon), paper pulp (Pulp), mix in proportion and mutually and use.
As shown in Figure 1, handling process of the present invention is through the moulding of the combing effect of carding machine 2 or specially-shaped machine and make fiber web 3 with fibrous raw material 1, this fiber web will further be sent in the hot air apparatus 4, so that the hot blast of hot air apparatus 4 penetrates, low-melting fiber in the fiber web 3, the effect of heated air and blast, make the low melting point composition fusion of meldable fibre surface, between fiber and fiber thereby stick together mutually, form a non-woven with high loft, high strength, softness, through after this treatment step, promptly form hot blast Nonwovens 5 of the present invention.At last, this hot blast Nonwovens 5 is batched rolling through coiling machine 6.
In the embodiment shown in fig. 1, include two cycling hot wind wheels 41,42 in the hot air apparatus 4, fiber web 3 promptly is overlying on the surface of this cycling hot wind wheel, and the hot blast that hot air apparatus is produced penetrates and makes between fiber mutually and bind.
And embodiment shown in Figure 2 is the mode that adopts plane conveying 7, has only hot blast wheel 71.Fiber web is penetrated by the hot blast of hot air apparatus 7 equally, and makes the low-melting fiber in the fiber web, and the effect of heated air and blast makes the low melting point composition fusion of meldable fibre surface, between fiber and fiber thereby stick together mutually.
Embodiment shown in Figure 3 is the mode that adopts hot air circulation about in the of, and the hot blast that its hot air apparatus 8 is produced penetrates into another side by fibroreticulate one side, can make the fusion of fiber surface low melting point composition equally, between fiber and fiber thereby stick together mutually.
The hot blast method of forming is different from traditional hot pressing wheel method on its procedure for producing, hot pressing wheel method is by the heat pressure adhesive of two or several hot pressing wheels, fiber is combined with each other, and makes the hot pressing Nonwovens.
And hot blast method of the present invention is to pass the fiber in the cotton layer and the gap of fiber with hot-air, because of the relation of heat with blast, fiber surface thereby softening fusion, fiber is bonded together mutually, the Nonwovens that this kind processing method is produced has advantages such as high loft, highly-breathable, flexibility and comfort.
The hot blast Nonwovens that uses the inventive method to produce is particularly useful for the surfacing of paper diaper, cotton wool, have moisture penetration soon, do not bleed back, advantage such as the surface is dry and comfortable.Improve the hot pressing Nonwovens widely because of shortcoming such as quality approaches, do not have thick sense, is easy to bleed back, the surface is dry and comfortable inadequately, feel and flexibility are not good.
The web of hot blast Nonwovens constitutes, because of the use variation of fiber, the difference and the web number of plies (individual layer or several layers of formation) of material, it is functional also variant, and carding device is also different, it is comb and parallel cotton fibers prior to spinning board number different (example is formed by one or several), therefore can use and make different elasticity according to the needs of reality and required effect.
As previously mentioned, the blast heater of the inventive method is configured with that two circulating airs are wheeled, and the single cycle hot blast is wheeled, and the plane carries, heated air circulation type or the like different modes up and down, all can get a desired effect.
The inventive method need not passed through the hot pressing running roller, no matter face wheel or engraving flower running roller are pressed combination, also combine without chemical agent or hot glue stick, but use hot air circulation, utilize the hot melt of fiber, make fiber and fiber in the web form non-woven because of being together with each other between the hot-air.