KR20030057787A - Multi-layer spunbond - Google Patents

Abstract

PURPOSE: Multi-layer spun bond non-woven fabric is characterized by laminating non-woven fabrics different in structure and properties. The multi-layer spun bond non-woven fabric is capable of being light, intercepting sunbeam properly and controlling rearing of weeds. CONSTITUTION: The multi-layer spun bond non-woven fabric is comprised of a surface layer(1) and a back layer(3) manufactured with spun bond non-woven fabrics having 1-3 denier of fineness and a medium layer(2) manufactured with melt blown non-woven fabric having 0.01-0.1 denier of fineness. Weight per unit area is 30-60 gsm.

Description

Multi-layer spunbond

The present invention relates to a multi-layered spanbonded nonwoven fabric useful for inhibiting weed growth such as crops and orchards by appropriately blocking sunlight required for plant growth.

Conventionally, a herbicide or a mulch vinyl covering method has been commonly used as a weed prevention or weeding method in crops, orchards, etc. In the case of using a herbicide, there is a risk of soil contamination or acidification. There are problems such as killing beneficial microorganisms or influxing to the crops shipped as products, and adversely affecting the human body.In the case of using mulching vinyl, the mulching vinyl isolates the soil from the air, so oxygen is used as the root of the soil and crops. There is a problem that the supply is limited and the culture of beneficial microorganisms is suppressed to promote acidification of the soil and to slow down the growth of crops.

On the other hand, in recent years, a lot of methods to cover the top of the soil while blocking the heat and heat insulation, but the general non-woven fabric is used because the thicker side of the thicker the moisture content of the soil and thicker shade, so Harsh roots, such as the roots of nonwovens. Therefore, in order to solve this problem, Korean Patent Publication No. 1998-32 uses a very fine synthetic yarn of approximately 3 ± 0.2 denier and 0.8-1.5 mm thick nonwoven fabric embossed on both sides to prevent soil acidification and weed growth. The use of a nonwoven fabric is disclosed. In this case, since the fineness of the fibers constituting the nonwoven fabric is about 3 denier, the unit weight must be high to block sunlight.

The present invention has been made to solve the above problems, multi-layered non-woven fabric having a different structure and characteristics by stacking in a multi-layer to block the sunlight properly even at low weight, especially a multi-layered span with excellent effect of inhibiting the growth of weeds Its purpose is to provide bond nonwovens.

1 is an exemplary view of a cross-sectional structure of a multi-layer span bond nonwoven fabric of the present invention.

<Description of the code | symbol about the principal part of drawing>

1: Surface layer 2: Intermediate layer 3: Back layer

The present invention has a structure in which a microfiber melt blown layer is laminated as an intermediate layer (2) between a span bond layer used for the surface layer (1) and the back layer (3), that is, a span bond layer / mel in one method of achieving the above object. A nonwoven fabric having a multilayer structure of tumbled / spanbond layers is disclosed, and the present invention will be described in detail below.

Since the spunbond nonwoven fabric used for conventional weed growth suppression is mostly composed of filaments of 2.0 to 3.0 denier level, in order to effectively block sunlight, relatively heavy weight products having a weight of 60 gsm or more per unit area have been used. They developed a structure in which microfiber melt blown in the range of 0.01 to 0.1 denier was laminated between span bonds to effectively block sunlight even with a low volume.

In general, spunbond forms a non-woven fabric by forming a filament through a confinement of a constant spinning hole size and solidifying and stretching it through a cooling device. It is a dense nonwoven fabric by minimizing blowing with strong air.

In the present invention, as the spunbond nonwoven material constituting the surface layer 1 and the back layer 3, polypropylene having a melt index (MFR) in the range of 25 to 60 g / 10 minutes is particularly useful, but is not limited thereto. These can also be used as needed. In addition, the fineness of the fibers constituting the span bond layer is preferably about 1 to 3 denier, and preferably about 10 to 60 gsm per unit area of the span bond portion.

In the present invention, in the case of the meltblown nonwoven fabric laminated between the span bond layers as the intermediate layer 3, it is preferable to use synthetic resin (especially polypropylene) having a melt index in the range of 800 to 1000 g / 10 minutes. In addition, the fineness of the fibers constituting the melt blown layer is about 0.01 to 1 denier microfiber, and the weight per unit area of the melt blown portion is preferably in the range of 1 to 30 gsm.

The synthetic resin stored in the silo is transferred to a dosing for weighing raw materials and fed to the extruder by a certain amount, and the raw materials supplied to the spunbond portion are melted and kneaded in the extruder. It is filamentized by spinning through a detent consisting of an orifice. In the case of melt blown, the molten synthetic resin is blown into the air with strong air from both sides when it is spun through the mold to make it extremely fine. The radiated filaments are solidified by the cooling air injected through the honeycomb-shaped chamber and are drawn by the pressure of the air blown from the upper part and the air sucked from the lower part of the conveyor belt, and are laminated on the conveyor belt at a constant weight.

In the present invention, a single or two or more composite spanbonded nonwoven fabrics prepared as described above are used as the front layer (1) and the back layer (3), and a single or two or more composite meltblown nonwoven fabrics are laminated between the intermediate layer (2). A nonwoven fabric having a structure is manufactured. The multilayered web is thermally laminated and bonded using a roll roll or the like to impart mechanical properties and shape stability. At this time, the configuration of the calendar roll is preferably emboss roll (Embossroll) having a bonding rate of 10-19% and the other side is composed of rolls with smooth surfaces, but both sides may be composed of emboss rolls. Do. The surface layer, the back layer, and the intermediate layer may be composed of a single spunbond nonwoven fabric or a meltblown nonwoven fabric, but are not limited thereto. The surface layer 1, the back layer 3, or the like may be formed using two or more composite layers. The intermediate layer 2 can be constructed.

On the other hand, the weight per unit area of the final product of the nonwoven fabric having the above configuration is suitable in the range of about 30 ~ 60gsm, if less than 30gsm it is difficult to effectively inhibit weed growth due to the high transmittance of sunlight, and if it exceeds 60gsm The effect is insufficient.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, wherein various characteristics of the manufactured nonwoven fabric were measured using the following methods.

<The tensile strength>

Using a tensile strength tester (Instron) measuring equipment by using the ASTM D1682-64 method, a sample piece of 5cm in width and 7.5cm in sample length was analyzed under the condition of 300mm / min tensile speed.

〈Mt. Shinto〉

The elongation at maximum tensile strength measured by the method of ASTM D1682-64 was determined.

<thickness>

Measurement was made using a dial gauge.

〈Full Island〉

The diameter of the filament was measured using a microscope.

〈Light Transmittance〉

Using the equipment that can measure the light transmittance, the light transmitted through the nonwoven fabric is measured by CCD camera, and it is expressed as% of the light transmitted through the original light.

Example 1

The spunbond nonwoven fabric constituting the surface layer and the back layer uses polypropylene having a melt index (MFR) of 60 g / 10 minutes as the main raw material, and the polypropylene having a melt index of 900 g / 10 minutes as the main raw material of the meltblown nonwoven fabric constituting the middle steel layer. To prepare a laminated nonwoven fabric having the characteristics as shown in Table 1 below, the physical properties are shown in Table 1 to evaluate.

Example 2

As shown in Table 1 in Example 1, a composite laminated nonwoven fabric was produced with a weight of 60 g per 1 m 2, and the physical properties thereof were shown in Table 1 below.

Comparative Example 1

As shown in Table 1 in Example 1, a composite laminated nonwoven fabric was prepared with a weight of 20 g per unit of 2 m 2, and the physical properties thereof are shown in Table 1 below.

Comparative Example 2

As shown in Table 1 in Example 2, a composite laminate nonwoven fabric was produced with only 60 g of weight per 1 m 2 of the composition by spunbonding without melt blown lamination, and the physical properties thereof are shown in Table 1 below.

TABLE 1

As can be seen from the above examples and comparative examples, the multi-layered spunbond nonwoven fabric according to the present invention can properly block sunlight at low weight by laminating the surface layer and the spunbond nonwoven fabric using a meltblown nonwoven fabric in the intermediate layer. In particular, it is an agricultural nonwoven fabric useful for inhibiting weed growth.

Claims (4)

Multi-layered spunbond nonwoven fabric with the surface layer and the back layer composed of spanbonded nonwoven fabric with 1 ~ 3 denier degree of fineness, and the middle layer composed of meltblown nonwoven fabric with 0.1 ~ 0.1 degree of fineness with 30 ~ 60gsm per unit area. The multi-layer spanbonded nonwoven fabric of claim 1, wherein the spanbonded nonwoven fabric has a weight per unit area in the range of 10 to 60 gsm. The multi-layer spunbond nonwoven fabric of claim 1, wherein the meltblown nonwoven fabric has a weight per unit area in the range of 1-30 gsm. The nonwoven fabric of claim 1 wherein the spanbonded nonwoven fabric uses polypropylene having a melt index of 25 to 60 g / 10 minutes as the main raw material, and the meltblown nonwoven fabric comprises polypropylene having a main material melt index of 800 to 1000 g / 10 minutes. Used multi-layer spanbonded nonwovens.