KR20050119766A - Multi-layer spun-bonded fabric and its manufacturing method - Google Patents

Abstract

The present invention relates to a multi-layered spunbond nonwoven fabric and a manufacturing method thereof, wherein the spunbond nonwoven fabric is the outermost layer, and the inner layer is at least one meltblown layer.

(Meltblown) Spunbond nonwoven fabric comprising a nonwoven fabric layer and optionally laminated with at least one or more spunbond nonwoven fabric layers and / or meltblown nonwoven fabric layers, as required, on a continuously driven screen belt. Laminating layers and laminating at least one meltblown nonwoven layer on the spunbond nonwoven layer and optionally at least one spunbond nonwoven layer and / or meltblown nonwoven layer as needed. After lamination, the spunbond nonwoven fabric layer is laminated again and manufactured by thermal adhesion by applying heat and pressure at the same time using a thermal calender, and by optimizing the amount of the meltblown nonwoven fabric, the synthetic resin does not penetrate to obtain an excellent touch. Could.

Description

Multi-layer spunbond nonwoven fabric and its manufacturing method {Multi-layer spun-bonded fabric and its manufacturing method}

The present invention is laminated with a PE (polyethylene) film (sanitary), hygiene, especially infant diapers, back practice pants diapers and adult incontinence diapers, sanitary napkins

The present invention relates to a multi-layered spunbond nonwoven fabric used in a backsheet and a manufacturing method thereof, and more particularly to a spunbond nonwoven fabric as an outermost layer, and an inner layer of at least one meltblown nonwoven layer. At least one spunbond nonwoven layer and / or meltblown nonwoven layer additionally laminated as necessary, wherein the spunbond nonwoven layer is laminated and spanned on a continuously driven screen belt. At least one meltblown nonwoven layer is laminated on the bond nonwoven layer, and at least one or more spunbond nonwoven layers and / or meltblown nonwoven layers are additionally laminated as needed, and then again. Multi-layered spunbond nonwoven fabric characterized by laminating a spunbond nonwoven layer and applying heat and pressure simultaneously using a thermal calender And to a method for producing the same.

Nonwoven fabric is a combination of thin felt-like webs in which the fibers are arranged in parallel, theodolite or in the opposite direction with an adhesive, or by mixing thermoplastic fibers in the web and melting them by means of heat and pressure. Its use is expanding, including industrial fabrics, plastic reinforcement materials, thermal and electrical insulation materials, air bubbles for coated products, export bags, bandages as sanitary agents, diapers, sanitary covers, bibs, napkins, tablecloths, towels, curtains, It is also used in futons, upholstery, medical wicks, bats, petticoats, swimwear, skirts and the like.

In particular, the spunbond nonwoven fabric refers to a nonwoven fabric made by spinning a chemical fiber, and is a kind of nonwoven fabric made by forming a long layer of fiber on a conveyor by blowing the fiber coming out of the nozzle onto a conveyor that runs on the conveyor. There is also an advantageous advantage.

In addition, the meltblown nonwoven fabric refers to the nonwoven fabric manufactured in the meltblown process, and since the web used is microfiber, it has the advantages of being soft and insulated from general nonwoven fabrics such as heat retention and high filtration performance, but the web strength is very weak. It is a drawback, and the most used raw fiber is polypropylene.

The structure and materials used for hygiene have been changed and improved at a rapid rate, and the most important improvements are the thinning (thinning) and softening of the hygiene. In the case of sanitary products, especially in the diaper part, the backsheet material is made of polyethylene film as the outermost layer, and since the mid-1990s, the film nonwoven lamination is formed by laminating with a nonwoven fabric to improve the feel of the film. In the 2000s, in order to further improve the feel of the backsheet, the method of laminating the film and the nonwoven fabric was changed from the conventional thermal lamination to the lamination using synthetic resin.

That is, the conventional non-woven fabric for the backsheet of the diaper has been used a span bond nonwoven fabric series, and the method of laminating the nonwoven fabric and the PE film was mostly a heat adhesion method using a heat calendar. However, the backsheet prepared by the above method has not started to be converted to a method using a synthetic resin (Cold Glue, Hot Glue) in the heat-adhesive method because the touch is not soft.

In case of laminating by spunbond nonwoven fabric and synthetic resin adhesive method, if the weight of nonwoven fabric is high, there is no phenomenon that synthetic resin is not leaked out, but if the weight of spanbond nonwoven fabric is low, synthetic resin is bleeded out and rolled up in the form of roll. There was a problem that the adhesion was degraded.

In particular, when the spunbond nonwoven fabric used in the backsheet is gradually reduced in weight, a problem arises that the synthetic resin penetrates the nonwoven fabric when it is laminated with the film with synthetic resin. Bonded nonwovens are required to have sufficient functionality to block synthetic resin.

Accordingly, an object of the present invention is to optimize the melt blown amount of the inner layer to have a soft touch without penetrating the synthetic resin, so that the diaper span is suitable for backsheets for infant diapers, back practice pants diapers, adult incontinence diapers, sanitary napkins, etc. To provide a bond nonwoven.

Another object of the present invention is to provide a method for easily manufacturing a multi-layered spunbond nonwoven fabric of the above object.

In order to achieve the above objects as well as other easily expressed objects, in the present invention, the spunbond nonwoven fabric is the outermost layer, and the inner layer has at least one meltblown nonwoven layer and at least as needed. At least one spunbond nonwoven layer and / or meltblown nonwoven layer may be additionally laminated, with a spunbond nonwoven layer laminated on a continuously driven screen belt and at least one over the spunbond nonwoven layer. Laminate the meltblown nonwoven layer of the layer, and additionally the at least one spunbond nonwoven layer and / or the meltblown nonwoven layer if necessary, and then stack the spunbond nonwoven layer again. And the heat calender is applied to heat and pressure at the same time to produce heat-adhesive, the amount of melt blown nonwoven fabric is optimized If you do not feel the transmission server was able to get a good effect.

The present invention is described in more detail as follows.

The multi-layered spunbond nonwoven fabric according to the present invention has a spunbond nonwoven fabric as the outermost layer, the inner layer has at least one meltblown nonwoven layer, and at least one or more spunbond nonwoven layers and / or meltblown nonwoven fabrics as necessary. The layers are characterized as being additionally stacked.

In addition, the method for producing a multi-layered spunbond nonwoven fabric according to the present invention is to laminate a spanbonded nonwoven fabric layer on a continuously driven screen belt, and to laminate at least one meltblown nonwoven fabric layer on the spunbonded nonwoven fabric layer as needed. At least one or more spanbonded nonwoven fabric layers and / or meltblown nonwoven layers are additionally laminated, followed by further lamination of the spunbonded nonwoven fabric layer and thermally adhesive by applying heat and pressure simultaneously using a thermal calender.

In the present invention, in order to prevent the resin adhesive from penetrating the nonwoven fabric in the process of laminating a low-weight spanbond nonwoven fabric and polyethylene film using a synthetic resin adhesive, the basic nonwoven fabric is composed of a spanbond nonwoven fabric / meltblown nonwoven fabric / spunbond nonwoven fabric. It consisted of multilayer. Here, the spanbonded nonwoven fabric layer forming the outer layer can be composed of one or more layers, and the inner meltblown nonwoven layer can also be composed of one or more layers, and the number of layers to be formed is not limited. Hereinafter, the multi-layered spunbond nonwoven fabric of the present invention will be referred to as "SMS-based nonwoven fabric".

The weight of the SMS-based nonwoven fabric is preferably 8-18 gsm (g / m 2), more preferably 10-13 gsm is effective, and when the weight exceeds 18 gsm, there is an economic problem, when less than 8 gsm, strength and touch There was a disadvantage of degradation.

The melt blown nonwoven fabric constituting the SMS-based nonwoven fabric is preferably 0.3 to 2 gsm, more preferably 0.5 to 1.5 gsm. If the amount of melt blown nonwoven fabric included in SMS-based nonwoven fabric is too small, less than 0.3gsm, the tissue is not dense and effectively prevents the penetration of synthetic resin. If it exceeds 2gsm, the tissue becomes dense and effective to block the penetration of synthetic resin. There is a problem that does not exhibit a touch.

That is, if the amount of the meltblown nonwoven fabric is too small, the pore size formed by the fibers constituting the nonwoven fabric and the inter-fiber lamination becomes large, so that the synthetic resin in the fluid form cannot be effectively blocked, and the meltblown nonwoven fabric If the amount is too large, it becomes a paper-like feel and loses the meaning of synthetic resin lamination.

Spunbond nonwoven fabrics melt molten plastic resin and extrude into a plurality of orifices to form filaments, cool with cooling air imparted from a cooling chamber to solidify the filaments, and draw fibers of small diameter through stretching.

Resin used in the present invention is a polyolefin-based polypropylene resin, the meltblown nonwoven fabric manufacturing method is a known method commonly used in the art to which the present invention belongs Melt Index (MI: Melt Index) of 800 ~ 1200g Melting a 10-minute polypropylene resin and blowing it into a number of orifices blows it with strong hot air from both sides of the detention to form a microfiber. Usually, the fibers constituting the meltblown nonwoven fabric have a thickness of 1 to 5 탆.

The main function of the present invention is to effectively block the permeation of the synthetic resin adhesive in the fluid form, and expressing this function is because the weight per unit area of the meltblown nonwoven layer, that is, the meltblown nonwoven layer acts as a large influence factor. The weight per unit area of tumbled nonwovens shall be 0.3 to 2 gsm.

In the basic multi-layered spunbond nonwoven fabric (SMS-based nonwoven fabric), a spunbond nonwoven fabric layer is laminated on a continuously driven screen belt, and a meltblown nonwoven fabric layer is laminated on the spunbond nonwoven fabric layer. So it is made of SMS nonwoven fabric.

Herein, the spunbond nonwoven fabric layer and the meltblown nonwoven fabric layer may be one or more layers, and the number of layers is not limited. That is, a spunbond nonwoven layer is laminated on a continuously driven screen belt, and at least one meltblown nonwoven layer is laminated on the spunbond nonwoven layer, and at least one or more spunbond nonwoven layers and / or meltbles, if necessary. The additional nonwoven layer is additionally laminated, and then the spunbond nonwoven layer is laminated again to form a spanbond such as SMMS (spanbond nonwoven fabric / meltblown nonwoven fabric / meltblown nonwoven fabric / spunbond nonwoven fabric), SSMS, SSMMS, SSMMSS, etc. Various preparations can be made depending on the addition of the meltblown radiation beam.

Multi-layer integrated webs are heat-bonded and sheeted under heat and pressure through a thermal calender.

The following Examples and Comparative Examples illustrate the present invention more specifically, but do not limit the scope of the present invention. Various properties and physical properties in the Examples and Comparative Examples were measured and evaluated by the following method.

(1) Weight: EDANA 40.3-90

(2) Tensile strength and Elongation: EDANA 20.2 -89

(3) Bending Length: EDANA 50.5-99

(4) Hydrostatic Head: DIN53886

Example 1

The multi-layered spunbond was manufactured using a polypropylene resin having a melt flow index (MI: Melt Index) of 1,000 g / 10 min. The weight of the spunbond nonwoven fabric layer was 12.5 gsm, and the weight of the meltblown nonwoven fabric layer was 0.5 gsm. The non-woven fabric of SMS type having a total weight of 13 gsm was prepared, and the properties and physical properties thereof were listed in Table 1.

Example 2

  The SMS-based nonwoven fabric was prepared in the same manner as in Example 1 except that the weight of the spunbond nonwoven fabric layer was 14.7 gsm and the meltblown nonwoven fabric layer was 0.3 gsm and the total weight was 15 gsm. It described in 1.

Comparative Example 1

  A nonwoven fabric was prepared in the same manner as in Example 1 except that the weight of the spunbond nonwoven fabric layer was 13 gsm and that of the meltblown nonwoven fabric layer was 0 gsm and the total weight was 13 gsm. .

Comparative Example 2

   The SMS-based nonwoven fabric was prepared in the same manner as in Example 1 except that the weight of the spunbond nonwoven fabric layer was 15 gsm and the meltblown nonwoven fabric layer was 3 gsm and the total weight was 18 gsm. Described.

Table 1

Item unit Example 1 Example 2 Comparative Example 1 Comparative Example 2 Gross weight gsm 13 15 13 18 Meltblown Nonwoven Layer Weight gsm 0.5 0.3 0 3 Strength (MD) kg / 5cm 2.8 3.4 2.8 3.4 Strength (CD) kg / 5cm 1.4 1.8 1.4 1.8 Water pressure mmH ₂ O 100 120 60 160 Lecture mm 35 38 35 48

As described above, in the present invention, the spunbond nonwoven fabric is the outermost layer, and the inner layer has at least one meltblown nonwoven layer, and at least one or more spunbond nonwoven layers, if necessary, and And / or an additional layer of meltblown nonwoven is laminated, wherein the spunbond nonwoven layer is laminated on a continuously driven screen belt and at least one meltblown on the spunbond nonwoven layer.

(Meltblown) Laminates nonwoven layers and spans at least one layer as needed

(Spunbond) Non-woven fabric layer and / or melt-blown non-woven fabric layer additionally laminated, and then spunbond non-woven fabric layer is laminated again and manufactured by heat bonding by applying heat and pressure at the same time using a thermal calender, melt-blown nonwoven fabric By optimizing the amount of, the synthetic resin was not permeated and the touch was excellent.

Claims (4)

The spunbond nonwoven fabric is the outermost layer, and the inner layer has at least one meltblown nonwoven fabric layer, and at least one or more spunbond nonwoven fabric layers and / or meltblown nonwoven fabric layers are additionally laminated as necessary. Multi-layered spunbond nonwoven fabric. The multi-layered spunbond nonwoven fabric of claim 1, wherein the total weight is 8-18 gsm.  The multi-layered spunbond nonwoven fabric of claim 1, wherein the meltblown nonwoven layer has a weight of 0.3 to 2 gsm. Laminating a spunbond nonwoven layer on a continuously driven screen belt and laminating at least one meltblown nonwoven layer on the spunbond nonwoven layer and optionally at least one spunbond nonwoven layer and / or meltblown nonwoven fabric And further laminating the layer, followed by further laminating the spunbond nonwoven layer and applying heat and pressure simultaneously using a thermal calender.