KR200270971Y1 - Double layer non-woven fabric geotextiles with high permeability under high load and pressure - Google Patents

Abstract

The present invention, in the nonwoven geotextile, the web is formed of any one or more of polypropylene fiber, polyester fiber having a thickness of 60 to 300 denier, the fibers of the web is randomly arranged and with respect to the longitudinal direction of the web A core layer formed by carding to be stacked inclined at a predetermined angle; Forming a web of any one or more of polypropylene fiber, polyester fiber having a thickness of 7 to 60 denier, carding so that the fibers of the web are randomly arranged and laminated at an angle with respect to the longitudinal direction of the web It provides a double layer nonwoven geotextile having a high permeability coefficient under high load pressure, characterized in that the core layer and the reinforcement layer is three-dimensionally bonded by needle punching.

Description

DOUBLE LAYER NON-WOVEN FABRIC GEOTEXTILES WITH HIGH PERMEABILITY UNDER HIGH LOAD AND PRESSURE}

The present invention relates to a geotextile, and more particularly to a nonwoven geotextile formed of a double layer.

In general, geotextiles are mainly used as flooring of landfills, and are geotextiles that play an important role in not only supporting landfilled waste but also draining leachate or sewage generated from waste. The leachate from waste landfill has strong acidity or alkalinity, and if the garbage decays, the exposure temperature rises to 80 ℃, and geotextile has strong physical properties to withstand the environment of waste landfill such as being exposed to ultraviolet rays or sunlight for a long time. It must consist of materials. For reference, waste landfills should be equipped with a double-order leachate collection and exclusion system by law, and in a sanitary landfill, it can also be a single-order.

The geotextiles are divided into woven geotextiles and nonwoven geotextiles according to the type of material to be constructed.

The woven geotextile is formed by crossing the warp and weft yarns at right angles using a filament yarn or a spun yarn, and usually uses a yarn of about 1,000 to 3000 denier, and mainly uses polyester and polypropylene as raw materials.

The nonwoven geotextile is a form in which long fibers or short fibers are irregularly arranged and bonded. In the case of short fibers, needle punching is performed mainly, and in the case of long fibers, needle punching or heat fusion is performed. Combine by method. Since the nonwoven geotextile has a structure in which constituent fibers are irregularly bonded, the mechanical properties and hydraulic properties are excellent, and polypropylene and polyester fibers are used as materials.

On the other hand, Korean Utility Model Registration No. 225400 "Non-woven fabric geotextiles having excellent transmission coefficient under high load pressure" has a three-ply nonwoven geotextile composed of an inner fiber layer and a pair of outer fiber layers bonded to both sides of the inner fiber layer. Is disclosed.

The conventional three-ply nonwoven geotextile described above is provided with an outer fibrous layer separately on the upper and lower inner fibrous layers. The outer fibrous layers are added to give the tensile performance and the puncture resistance required for protecting the shield and slope stability, and serves to reinforce the strength of the three-ply nonwoven geotextile, but the leachate and sewage discharge time As a layer to increase the permeability, there was a problem in that the permeability was lowered.

In order to solve the above problems, an object of the present invention is to provide a double layer nonwoven geotextile having excellent tensile strength characteristics and high permeability characteristics even under high load pressure conditions such as a waste landfill or a landfill.

In order to achieve the above object, the present invention, in the nonwoven geotextile, forms a web from any one or more of polypropylene fibers and polyester fibers having a thickness of 60 to 300 denier, the fibers of the web is random A core layer arranged and formed by carding to be stacked at an angle with respect to the longitudinal direction of the web; A web is formed of at least one of polypropylene fiber and polyester fiber having a thickness of 7 to 60 denier, and the fiber of the web is formed by carding so that the fibers are randomly arranged and stacked at an angle with respect to the longitudinal direction of the web. It provides a double layer nonwoven geotextile having a high permeability coefficient under high load pressure, characterized in that the core layer and the reinforcement layer is three-dimensionally bonded by needle punching.

1 is a perspective view showing a double layer nonwoven geotextile having a high transmission coefficient under high load pressure according to a preferred embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

100: Bilayer Nonwoven Geotextile

110: core layer

120: reinforcement layer

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, if it is determined that the detailed description of the related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

The present invention provides a nonwoven geotextile consisting of a double layer of a core layer and a reinforcing layer, and the nonwoven geotextile has a web array structure having a high transmission coefficient even under high load / pressure.

1 is a perspective view showing a double layer nonwoven geotextile according to a preferred embodiment of the present invention. The bilayer nonwoven geotextile 100 according to the preferred embodiment of the present invention is composed of a core layer 110 and a reinforcement layer 120 coupled to the upper surface of the core layer 110.

Core layer

The core layer 110 may use synthetic fibers or natural / synthetic mixed fibers as raw fibers, and preferably, any one or more of polypropylene fibers and polyester fibers.

The thickness of the raw fiber is preferably in the range of 60 to 300 denier, and the weight per unit area of the web formed from the raw fiber is preferably in the range of 800 to 1800 g / m ² . The thickness of the raw fiber and the weight per unit area of the web may be determined in consideration of the environment of the target site to be installed and related laws, for example, the height of the landfill of the landfill, the load of the waste and the amount of leachate generated.

The polypropylene fiber is a synthetic fiber made of a propylene polymer, has a low specific gravity, is light, and is resistant to acids and alkalis and is excellent in chemical resistance. The polyester fiber is a synthetic fiber obtained by spinning polyester such as a condensation polymer of terephthalic acid and ethylene glycol, and has chemical stability, high mechanical strength, and excellent durability.

In particular, the core layer 110 does not simply stack horizontally continuous one or more of the polypropylene fibers and polyester fibers, but inclined by a predetermined angle, preferably 40 to 50 degrees, with respect to the longitudinal direction of the web. Laminate to form a web.

In this way, when the web is inclinedly stacked, the permeation performance of leachate is excellent, but the tensile strength variation of the web in the longitudinal and width directions is reduced, thereby increasing the overall tensile strength of the web, and crushed gravel mainly used in the leachate drainage layer in a waste landfill. It also has strong puncture resistance to such materials.

2. Reinforcement layer

The reinforcement layer 120 may use synthetic fibers or natural / synthetic mixed fibers of the same or different materials as the core layer, and preferably polypropylene fibers. The reinforcing layer 120 is bonded to the upper surface of the core layer 110 serves to reinforce the tensile strength and the puncture resistance of the core layer (110).

The raw fiber thickness of the reinforcing layer 120 is preferably in the range of 7 to 60 denier thinner than the original fiber thickness of the core layer 110, the weight per unit area of the web formed from the raw fiber is also 180 to 220 g less than the core layer The / m ² range is preferred. The thickness of the raw fiber and the weight per unit area of the web may be determined in consideration of the raw fiber thickness of the core layer 110 and the weight per unit area of the web.

In addition, like the core layer 110, the reinforcement layer 120 also does not simply stack the original fiber horizontally and continuously, but forms the web by stacking the film at an angle with respect to the longitudinal direction of the web, preferably 40 to 50 degrees. By doing so, while excellent in permeation performance for leachate, etc., the variation in tensile strength in the longitudinal and width directions of the web is reduced, thereby increasing the overall tensile strength of the web.

On the other hand, the manufacturing process of the double layer nonwoven geotextile of the present invention consists of a core layer forming process, reinforcing layer forming process and layer bonding process.

The core layer forming process and the reinforcing layer forming process may be achieved by releasing the fiber tuft of polypropylene or polyester, which is an original fiber, and simultaneously reducing the size of the fiber, thereby bleeding the fiber tuft. Hopping step of discharging a certain amount of fiber tufts per predetermined time, carding for separating small tufts, forming each fiber into a thinly spread web, and arranging the fibers inclined to form a predetermined angle with the length direction of the web ( Carding step, and forming step of adjusting the thickness and width of the web.

In addition, the layer bonding process is a needle punching step of joining a two-dimensional web arrangement into a three-dimensional web arrangement by placing a needle plate on the upper surface of the core layer and repeating the up and down motion of the plate attached with needles. Cutting step of cutting (Cutting) and winding the winding (Winding) step of winding the cut web in the form of a roll.

<Example 1-1>

A core layer is formed of polypropylene fibers having a thickness of 150 deniers, a reinforcement layer is formed of polypropylene fibers having a thickness of 10 deniers, and a reinforcement layer is laminated on the core layer, and needle punched to obtain a weight per unit area of 1000 g / A bilayer nonwoven geotextile of m ² was formed.

<Example 1-2>

A core layer is formed of polypropylene fibers having a thickness of 120 deniers, a reinforcing layer is formed of polypropylene fibers having a thickness of 40 deniers, and a reinforcing layer is laminated on the core layer, and needle punched to obtain a weight per unit area of 1200 g / A bilayer nonwoven geotextile of m ² was formed.

<Example 1-3>

A core layer is formed of polypropylene fibers having a thickness of 80 deniers, a reinforcing layer is formed of polypropylene fibers having a thickness of 60 deniers, a reinforcing layer is laminated on the core layer, and needle punched to obtain a weight of 1400 g / unit. A bilayer nonwoven geotextile of m ² was formed.

<Example 2-1>

A core layer is formed of a polyester fiber having a thickness of 150 deniers, a reinforcement layer is formed of a polypropylene fiber having a thickness of 10 deniers, a reinforcement layer is laminated on the core layer, and needle punched to obtain a weight per unit area of 1000 g / A bilayer nonwoven geotextile of m ² was formed.

<Example 2-2>

A core layer is formed of a polyester fiber having a thickness of 120 deniers, a reinforcement layer is formed of a polypropylene fiber having a thickness of 40 deniers, a reinforcement layer is laminated on the core layer, and needle punched to obtain a weight per unit area of 1200 g / A bilayer nonwoven geotextile of m ² was formed.

<Example 2-3>

A core layer is formed of polyester fiber having a thickness of 80 denier, a reinforcement layer is formed of polypropylene fiber having a thickness of 60 denier, and then a reinforcement layer is laminated on the core layer and needle punched to obtain a weight of 1400 g / unit. A bilayer nonwoven geotextile of m ² was formed.

<Example 3>

A core layer is formed of polyester fiber and polypropylene fiber having a thickness of 120 denier, a reinforcement layer is formed of polypropylene fiber having a thickness of 40 denier, and a reinforcement layer is laminated on the core layer and needle punched per unit area. A bilayer nonwoven geotextile having a weight of 1200 g / m ² was formed.

Table 1 is a table showing the results of measuring the physical properties of the double-layer non-woven geotextile prepared according to a preferred embodiment of the present invention, Table 2 below is a double-layer nonwoven fabric produced according to each embodiment of the present invention This chart shows the results of measuring the physical properties of the type geotextiles.

Test Items Test Methods unit Test result Tensile Strength (Length) KS K 0520-1995 Kgf 156.5 Tensile Strength (Width) KS K 0520-1995 Kgf 103.4 Tensile Elongation (Length) KS K 0520-1995 Kgf 122 Tensile Elongation (Width) KS K 0520-1995 Kgf 117 Permeability coefficient KS F 2322-1995 Cm / s 2.2 × 10 ^-1 Puncture strength ASTM D 4833 Kgf 102.0 Horizontal Permeability Coefficient (Pressurization Pressure 200㎪) KS K 0752-1998 ㎡ / s 4.9 × 10 ^-5

(Weight per unit area 1000 g / m ² : core layer-800 g / m ² , reinforcement layer-200 g / m ² )

Weight per unit area Permeability Coefficient by Load Pressure (㎡ / sec) 100 kPa 200 kPa 300 kPa 400 kPa 1000 g 6.0 × 10 ^-5 4.9 × 10 ^-5 4.0 × 10 ^-5 3.4 × 10 ^-5 1500 g 6.3 × 10 ^-5 5.8 × 10 ^-5 4.7 × 10 ^-5 3.6 × 10 ^-5 2000 g 6.4 × 10 ^-5 5.9 × 10 ^-5 4.8 × 10 ^-5 3.6 × 10 ^-5

(Experimental Method: KS K 0752-1998)

As described above, the double layer nonwoven geotextile having a high permeability coefficient under high load pressure according to the embodiment of the present invention is not only made of the web layer of the core layer and the reinforcement layer inclined with the longitudinal direction of the web, but also the reinforcement layer is bonded to the upper surface of the core layer. It is excellent in tensile strength and puncture resistance, and has the effect of having high permeability even under high load pressure conditions such as waste landfill.

Claims (3)

In nonwoven geotextile, A web is formed of at least one of polypropylene fibers and polyester fibers having a thickness of 60 to 300 denier, and formed by carding the fibers of the web so as to be randomly arranged and stacked at an angle with respect to the longitudinal direction of the web. A core layer; Forming a web of any one or more of polypropylene fiber, polyester fiber having a thickness of 7 to 60 denier, carding so that the fibers of the web are randomly arranged and laminated at an angle with respect to the longitudinal direction of the web Double layer non-woven geotextile having a high permeability coefficient under high load pressure, characterized in that the core layer and the three-dimensional reinforcement layer by needle punching. The method of claim 1, The web of the core layer is a bilayer nonwoven geotextile having a high transmission coefficient under high load pressure, characterized in that the weight per unit area is 800 to 1800 g / m ² . The method of claim 1, The web of the reinforcing layer is a bilayer nonwoven geotextile having a high transmission coefficient under a high load pressure, characterized in that the weight per unit area of 180 to 220 g / m ² .