KR20070052129A - Polypropylene spunbond nonwoven fabric having multi-layer for mulching and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a multi-layered polypropylene spunbond nonwoven fabric for mulching (weed removal) having a different color on both sides of the nonwoven fabric, having excellent weather resistance, breathability, and drainage, and excellent fruit coloring property, and the method of manufacturing the same. Multi-layered polypropylene spanbonded nonwoven fabric for the polypropylene spanbonded nonwoven fabric has a double layer structure of white color layer on one side and a black color layer on the other side, and the ratio of white color layer is 25 It is -75%, the weight ratio of the color which comprises both surfaces is 0.5-1.5: 1.5-0.5, The said polypropylene resin has a melt index (MI) of 20-80g / 10min, with respect to the whole polypropylene resin, The UV stabilizer is characterized in that it comprises a HALS-based UV stabilizer 0.1 ~ 1.5% by weight.

The nonwoven fabric of the present invention configured as described above can be used for a long time, excellent in breathability and heat retention, while suppressing the transmission of sunlight to maintain weed removal efficiency, while obtaining a reflection effect of sunlight to reach a lot of light to fruit It is a useful invention that can produce fruit with high merchandise value due to excellent coloring of fruits.

Nonwovens, Polypropylene, Breathable, Colorable, Weed Remover.

Description

Polypropylene spunbond nonwoven fabric having multi-layer structure for mulching and manufacturing method thereof

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional photograph of a double-sided dichroism multilayer structure polypropylene spunbond nonwoven fabric for mulching according to an embodiment of the present invention.

Figure 2 is a schematic diagram schematically showing an apparatus for producing a double-sided bi-color multi-layered polypropylene spanbond nonwoven fabric for mulching according to the present invention.

* Explanation of the main signs in the drawings

10: SILO 11,11 ': Raw material weighing device

12,12 ': EXTRUDER

13,13 ': Spin pump (SPINPUMP) and spin beam (SPINBEAM)

14,14 ': quenching chamber

15,15 ': INTERMEDEATE CHANNEL

16,16 ': SUCTION BLOWER

17: SCREEN BELT

18: Calendar (CALENDER)

19: winder

The present invention relates to a multi-layered polypropylene spanbonded nonwoven fabric for mulching (weed removal) and a method for manufacturing the same. More specifically, the nonwoven fabric has a different color on both sides of the nonwoven fabric and has excellent weatherability, breathability and drainage, and excellent fruit coloring. It relates to a multi-layered polypropylene spunbond nonwoven fabric for and a method for producing the same.

As labor costs increase due to industrialization and the aging of the rural population, various measures have been proposed to reduce the labor force, among which various methods have been tried to remove the weeds such as orchards more easily with less labor. For example, conventionally, a black general polyethylene film has been used to cover the soil to prevent weed photosynthesis and to suppress and remove the growth thereof. However, in the case of using such a conventional polyethylene film, the film has a disadvantage that requires a lot of additional labor, such as the lack of breathability and drainage to peel off the vinyl when watering. In addition, there are various problems such as the ability to discharge water or moisture and irrigation during the rainy season or during the dry season, which have the opposite characteristics of inhibiting the growth of fruit trees. In particular, the UV stabilizer is generally dispersed by exposure to sunlight. In the case of this uneven film, the intermolecular chains are broken by the ultraviolet rays of the sun, and the initial properties are lost and easily torn, and the secondary contamination problem is caused by being discarded in the soil instead of being reused due to embrittlement by the ultraviolet rays. .

Thus, in order to prevent secondary contamination as described above, for example, Korean Patent Application Nos. 2002-0074228, 2003-07007670, 2003-7009722, etc. disclose photodegradable and biodegradable films, but One disadvantage of the conventional mulching film is not completely solved.

On the other hand, in order to solve the breathability which is a problem of the conventional mulching film described above, Korean Patent Application No. 2001-0044745 is named "Agricultural nonwoven laminated film" "Weighing the inorganic material-containing resin for manufacturing breathable film in an extruder 70g / Rolled extension rolls in which a nonwoven fabric weighing less than 90 g / m 2 is supplied to one surface of the film in the molten state of the extruded film while extruding to less than 2 m 2, and the film is continuously laminated with a pressure-stretched mark composition. ) And a breathable film in which an agricultural nonwoven fabric provided with air permeability by rolling in a rolling roll configured as the elastic rubber roll 2 is laminated. In addition, in order to supplement the problems of weathering, breathability, etc. of the conventional mulching film as described above as a single layer of fine polypropylene fibers of a dark monochromatic color such as black or green containing a UV stabilizer uniformly Spunbonded nonwoven fabric was proposed, for example, Korean Patent Application No. 2004-0030299 refers to a green nonwoven fabric as shown in FIG. 1 using a green masterbatch for weed control under the name of "green nonwoven fabric for weed control". The main ingredient is polypropylene (PP) raw material, and green master batch 6% ~ 7% and light stabilizer (UV) 1.2% ~ 20%, depending on the application, after extrusion to 1D ~ 6D also depending on the application A method of manufacturing a green nonwoven fabric by subjecting the surface embossing size to 11%, 14.6%, 15%, 18%, and 19% after heat compression of the hydrophilic agent (HY: water absorbent) after thermal compression. Such a polypropylene green nonwoven fabric prevents embrittlement by ultraviolet rays, which is a disadvantage of the prior art, forms a web with a nonwoven fabric to allow proper drainage in the rainy season, and enables watering without peeling off the mulched nonwoven fabric in the dry season. It has been widely applied.

In particular, the conventional known polypropylene spunbond nonwoven fabric as described above has excellent properties such as economical efficiency, light weight, moldability, chemical resistance, etc., such as sanitary materials such as diapers, sanitary napkins, packaging materials, automotive interior materials, disposable work clothes, etc. In general, polypropylene is known to be vulnerable to ultraviolet rays, but it is known that it is vulnerable to ultraviolet rays. It is also widely used in the field. In particular, nonwoven fabrics used for weed removal in orchards such as grapes and apples have the advantages of addressing weatherability, breathability, and drainage, which have been pointed out as a conventional problem, as described above. It is composed of one color dark color and is installed under the orchard orchard and absorbs and blocks sunlight to prevent weed photosynthesis from the bottom of the orchard, but weeds are removed because of the absorption of sunlight. Fruits grown under fruit trees have poor colorability and are a factor in reducing the merchandise's effectiveness. That is, as described above, the conventional polypropylene nonwoven fabric has a low light transmittance due to the weight and thickness per unit area of the nonwoven fabric, which is excellent in suppressing the growth of weeds by installing the nonwoven fabric. Since the nonwoven fabric absorbs sunlight, in general, when the nonwoven fabric is not installed, the reflection effect such that the sunlight is naturally reflected from the ground is suppressed by the nonwoven fabric, so that it is covered by the leaves of the fruit tree or is grown under the fruit tree. Fruits do not receive enough light, the colorability is lowered, there is a disadvantage that the commodity value falls.

Accordingly, the present inventors have made a thorough study to solve the shortcomings of the above-mentioned conventional monochromatic polypropylene nonwovens, which lower the colorability of fruits when used for mulching, and thus provide the above polypropylene nonwovens having a specific bicolor multilayer structure. Solution to the present invention was completed.

The object of the present invention is excellent weather resistance can be used for many years, not only excellent breathability and warmth, but also maintain the excellent weed removal effect, but does not inhibit the color of the fruit as the non-woven fabric by reflecting without absorbing sunlight To provide a polypropylene spunbond nonwoven fabric for mulching.

Another object of the present invention is to provide a method for easily preparing a polypropylene nonwoven fabric for mulching having excellent characteristics as described above.

Multi-layered polypropylene spunbond nonwoven fabric for mulching of the present invention for achieving the above object;

With respect to the entire polypropylene spunbond nonwoven fabric, one side has a white color layer and the other side has a two-layer structure of a black color layer. The ratio of the white color layer is 25 to 75% by weight of the total spunbond nonwoven fabric, and constitutes both sides. The weight ratio of the color is 0.5 to 1.5: 1.5 to 0.5, and the polypropylene resin has a melt index (MI) of 20 to 80 g / 10 minutes, and the HALS ultraviolet stabilizer is used as an ultraviolet stabilizer for all polypropylene resins. It is characterized by including 0.1 to 1.5% by weight.

In the nonwoven fabric according to the present invention, the white color layer of the polypropylene spunbond nonwoven fabric is natural (NATURAL) color or white (WHITE COLOR), the black color layer is black (BLACK) or dark green (DARK GREEN), It may be DARK BLUE COLOR.

According to another configuration of the present invention, the polypropylene spunbond nonwoven fabric is characterized in that the weight per unit area is 40 ~ 120g / ㎡, the thickness is 0.1 ~ 1.0mm.

According to the present invention, the UV stabilizer contains 0.1 to 1.5% by weight, preferably 0.3 to 1.0% by weight. If the amount of UV stabilizer added is less than 0.1 wt% with respect to the total polypropylene resin, the weather resistance effect is insufficient. If it exceeds 1.5 wt%, the workability is poor and the cost is increased, such as pressure increase and trimming. This is undesirable.

According to another configuration of the present invention, the ratio of the weight ratio of the other colors on both sides of the nonwoven fabric constituting the entire nonwoven fabric is suitable ratio of 0.5 to 1.5: 1.5 to 0.5, if one color is the weight ratio of the other color If it is lower than 0.5, it is not preferable because the lower side is a white color, the solar reflection effect is lowered, and when the black color is black color, it is difficult to exert its characteristics, respectively.

Method for producing a multi-layered polypropylene spunbond nonwoven fabric for mulching of the present invention for achieving the above another object;

a) melting 5 to 20% by weight of UV stabilizer and 95 to 80% by weight of polypropylene with a kneader to prepare a UV stabilizer-containing master batch chip;

b) melt kneading 30 to 85 wt% of the pigment and 15 to 70 wt% of the polypropylene to produce a white batch masterbatch chip;

c) melt kneading 15-40% by weight of pigment and 60-85% by weight of polypropylene to produce a black master batch chip; And

d) a polypropylene chip having a melt index (MFR) of 20 to 80 g / 10 min is inserted in each of the different extruders, and each extruder contains the master batch chip containing the UV stabilizer obtained in step a) and b to each of the extruders Insert the master batch chips of each color obtained in step) to c), melt, mix and homogenize, melt spinning through spinneret, form filament through cooling and stretching process, and then move continuously. Forming and transporting a web of different colors on both sides of the layer in a multi-layer on the heat-adhesive calendar, characterized in that it is produced by imparting shape stability.

According to another configuration of the present invention, the spinneret of the extruder is characterized in that composed of two to five spin beams (SPIN BEAM).

According to another configuration of the present invention, the calender roll is characterized in that one side is an embossing roll having a bonding rate of 10 to 30%, the other side is composed of a plate roll smooth surface.

According to another configuration of the invention, the pressure of the calendar is 50 ~ 100 dyne / cm, the temperature is characterized in that 130 ~ 170 ℃.

According to another configuration of the present invention, the pigment of step b) is TiO ₂ and the pigment of step c) is characterized in that the carbon black.

According to the configuration of the present invention, the UV stabilizer-containing master batch chip prepared in step a) to be inserted into each extruder to adjust the amount of the UV stabilizer is contained 0.1 to 1.5% by weight relative to the total polypropylene resin, The reason is as described above.

It is preferable that the extruder used for manufacture of the double-sided bicolor multilayer structure spanbonded nonwoven fabric which concerns on this invention is what consists of two or more spin beams. In addition, according to the present invention can be used for many years to increase the economical efficiency, the UV stabilizer used to increase the weather resistance is made into a master batch chip (master batch chip) in order to improve the workability, thereby in the master batch chip It solved the problem of dispersibility and pressure increase of spinning process in nonwoven fabric manufacturing process. Preferably, in order to maximize the performance of the UV stabilizer, the UV stabilizer contained in the master batch chip has a content of 5 to 20% by weight. The master batch chip may be manufactured by melting an ultraviolet stabilizer and polypropylene with a kneader.

The white color is formed by a white master batch chip comprising 30 to 85% by weight of TiO ₂ and 15 to 70% by weight of polypropylene as a pigment, and black to 15 to 40% by weight of carbon black and 60 to 85 as a pigment. The polypropylene resins, which are each formed by black master batch chips in weight percent, and which are used to make each master batch chip, generally have a polypropylene resin having a melt index (MI) of 20 to 80 g / 10 minutes for nonwoven fabrics. It is preferable to use the one having the same melt index to produce a master batch chip. If the melt index (MI) is outside the range of 20 ~ 80g / 10 minutes, the workability of forming the nonwoven fabric is poor, which is not preferable.

The nonwoven fabric finally produced according to the present invention is preferably adjusted so that the content of the UV stabilizer is 0.1 to 1.5% by weight based on the total polypropylene resin, more preferably 0.3 to 1.0% by weight. If the amount of UV stabilizer added is less than 0.1 wt% with respect to the total polypropylene resin, the weathering effect is insufficient. If it exceeds 1.5 wt%, the workability is poor and the cost increases due to the pressure increase and trimming. Not preferred. In addition, as described above, the weight composition of the other color on both sides of the nonwoven fabric constituting the entire nonwoven fabric is suitably in a ratio of 0.5 to 1.5: 1.5 to 0.5, and if one color is lower than 0.5 than the color weight ratio of the other, It is not preferable because it becomes difficult to exhibit the characteristics of each color layer in which the light reflection effect is lowered or the weed removal effect is lowered.

The multi-layered polypropylene spunbond nonwoven fabric for mulching of the present invention configured as described above uniformly contains an ultraviolet stabilizer to solve the problem of embrittlement of the nonwoven fabric for removing weeds by solar ultraviolet rays, thereby enabling long-term use, and hydrophobic polypropylene. It is composed of fine fibers, so it is excellent in breathability and warmth, and it is easy to discharge internal moisture, and it can reduce damages such as pests caused by excessive humidity during precipitation and rainy season, and it is easy to process water and liquid fertilization without removing the nonwoven fabric in the dry season. It is possible to save labor, and in particular, the dual structure in which different colors are laminated on both sides of the nonwoven fabric, so that natural or white colors are directed upwards, and dark or black or brown colors are directed toward the ground, thereby transmitting sunlight. To maintain weed removal efficiency and another If obtained by the effect of sunlight reflected to go to the bottom of the fruit or fruit with leaves in a difficult natural light fruit has an effect that allows you to produce high-value fruit products by a light touch.

In addition, the manufacturing method of the multi-layered polypropylene spunbond nonwoven fabric for mulching according to the present invention is not a complicated process of impregnation or spray processing for physically attaching the UV stabilizer contained in accordance with the present invention to the fiber surface as described above. By adopting the method of making a master batch and dispersing it in polypropylene fiber, the workability of the work process is better, and the expression of each color is not a complicated process such as dyeing and the like but rather a complicated process of two-sided dichroism. It is excellent in workability by manufacturing and using a master batch chip of each color having a.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

1 is a cross-sectional photograph of a multi-layered polypropylene spunbond nonwoven fabric manufactured according to an embodiment of the present invention, and FIG. 2 schematically shows an apparatus for manufacturing a mulching double-sided dichroic multi-layered polypropylene spunbond nonwoven fabric according to the present invention. It is a schematic diagram.

In order to manufacture a bilateral bi-layer multi-layered nonwoven fabric according to the present invention, as shown in FIG. 2, a span bond manufacturing process consisting of at least two spin beams 13 is required, and the main raw material has a melt index (MI) of 20 to 80 g. Use a polypropylene chip for 10 minutes. If the melt index of the polypropylene chip as the main raw material is less than 20g / 10 minutes, there is a problem that the melt viscosity is too high, resulting in inferior desabilization. There is a disadvantage that the radioactivity is too low. First, from 0 to 5% by weight of the total master weight polypropylene and UV stabilizer master batch chip and white master batch chip containing 30 to 85% by weight of TiO ₂ in the spin beam of one spinning process (SPUNBOND UNIT "A") Input. The white masterbatch The TiO ₂ is less than 30% by weight of the master batch chip and a drawback could not increases the amount of the master batch chip, economical, TiO ₂ When using a master batch chip of more than 85% by weight or more than 5% by weight is not easy to spin, there is a problem that the physical properties of the nonwoven fabric produced is lowered. In another spinning process (SPUNBOND UNIT "B"), the spin beam uses the same raw material polypropylene and UV stabilizer master batch chip, but with TiO ₂ Black master batch chip containing 15 to 40% by weight of carbon black or each master batch chip to obtain bicolor such as dark green or dark blue without using master batch chip containing If the concentration of carbon black in the master batch chip is 15 wt% or less, it is not economical because the amount of the master batch chip needs to be increased in order to obtain the desired black color, and if the concentration of the carbon black exceeds 40 wt%, dispersibility and spinning workability There are disadvantages to this deterioration.

The manufacturing method of the multi-sided multi-layered multi-layered polypropylene spanbonded nonwoven fabric for mulching of the present invention is the same after the conveyor belt in the method of manufacturing the single-colored spunbonded nonwoven fabric, and is made in the same facility, It consists of a raw material weighing device 11, an extruder 12, and a quenching chamber 14. The polypropylene resins stored in the silo 10 are transferred to the raw material metering devices 11 and 11 'for weighing the raw materials, and are supplied to the extruders 12 and 12' by a predetermined amount. In addition, the master batch chip containing UV stabilizer and the color master batch chip corresponding to the color to be obtained are also transferred to each of the other raw material weighing devices 11 and 11 'and weighed by a certain amount, and each extruder 12 and 12' is weighed. Supplied. The supplied raw material and each master batch chip are melted and mixed in a hot extruder 12, 12 'and spun through a mold composed of a plurality of orifices, resulting in a fine thickness of 20-30 μm. The spun polymer is cooled and solidified by the cooling air injected through the honeycomb quenching chambers 14 and 14 ', and the suction blower suctioned from the lower part of the conveyor belt (screen belt) 17, Stretched by the pressure of 16 'of air, it is laminated | stacked by constant weight on the conveyor belt 17 which is continuously driven. Typically, one beam BEAM composed of a detaining filament constituting the nonwoven fabric layer may be 2 to 5 beams in the present invention. If there are two or less beams, the two colors desired to be obtained in the present invention cannot be manufactured, and as the number of the beams increases, more multi-layered spunbond nonwoven fabrics can be produced, and a wide range of color weight ratios can be selected to produce nonwoven fabrics having various weight ratios. However, if the number exceeds 5, there is a problem such as excessive increase in investment cost during initial installation rather than an improvement in weight uniformity. The weight ratio of the color to be laminated on the conveyor belt 17, which is continuously driven, is adjusted by the weight of the spin pumps 13 and 13 'in front of the spin beam, and is laminated at a constant weight. At this time, the weight ratio of the color on both sides of the total weight of the nonwoven fabric is suitable, the ratio of 0.5 ~ 1.5: 1.5 ~ 0.5, when the ratio of the natural color or white color is less than 0.5, the amount of reflection of sunlight is less, coloring the fruit If the weight ratio of the black or dark color is less than 0.5, the effect on the effect is not large, and the herbicidal effect is lost when the weight ratio of each is greater than 1.5, and the color of the opposite side becomes less than 0.5, so the same problem as described above. Occurs. The formed web is combined with heat and pressure in calendar 18 to impart mechanical properties and morphological stability, wherein the construction of the calendar 18 roll is an embossing roll with a bonding rate of 10 to 30% on one side and the other on the other side. It consists of a plate roll with a smooth surface. If the bonding ratio is less than 10%, there is a disadvantage that the formed web is insufficient in form stability and low in strength, so that it cannot be applied as a cloth. If the bonding rate is more than 30%, the film is excessively large and the touch is poor and it is easily torn. There is a problem losing. The pressure of the calendar given at this time is 50 ~ 100 dyne / cm, the temperature is about 130 ~ 170 ℃. The basis weight of the produced polypropylene spunbond nonwoven fabric is 40-120 g / m <2>, and it is preferable for mulching to make thickness 0.1-1.0 mm. If the basis weight of polypropylene spunbond nonwoven fabric is less than 40g / m2 and the thickness is less than 0.1mm, it is not suitable for weed removal such as low nonwoven fabric properties and easy tearing. If the basis weight is more than 120g / ㎡, and the thickness is more than 1.0mm, it is too thick, the heat transfer is difficult to perform heat calendering to give shape stability, such as peeling occurs. This problem becomes difficult and excessive economic burden upon installation.

The following examples and comparative examples further illustrate the present invention in detail, but do not limit the scope of the present invention. Measurement and evaluation of various characteristic values in the examples and comparative examples were performed as follows.

[Assessment Methods]

(1) Weight per unit area (weight: g / m 2): Measured according to the method of ASTM D 3776-1985.

(2) Tensile strength: Tensile strength of tensile tester was measured by tensile strength 300mm / min. It was.

(3) Tensile elongation: The elongation at the time of maximum elongation measured by the method of said (2) was calculated | required.

(4) Weather resistance: 1200hr using Weater-O-mether facility (Light source: Xenon Arc, Black Panel Temp: 63 ℃, Relative Humidity: 50%, Irradiation: 0.35W / ㎡, Cycle: Spray 18min / Light 102min) After irradiation, the strength was measured as in (2) above, and the retention ratio was compared with the initial strength.

(5) Thickness: Measured using dial gauge.

(6) Haze: The haze of each nonwoven fabric was measured using a haze meter equipment.

(7) Manufacturing workability, installation workability, fruit coloring, weed removal effect: According to the Examples and Comparative Examples evaluated the ease of manufacturing operation according to the radioactive and silkiness according to the Examples and Comparative Examples, the nonwoven fabric thus produced is orchard The convenience of the installation work was evaluated, and the fruit was grown in the installed state to visually determine the coloring and weed removal effect of the fruit.

Example  One

In the present embodiment, the main raw material for the spunbond nonwoven fabric was polypropylene having a melt index (MI) of 35 g / 10 minutes, and using 15 wt% of polypropylene having 35 g / 10 minutes of the melt index using CHIMASSORB944 as an ultraviolet stabilizer. Master batch chips were prepared by uniformly kneading. 6 kg of the master batch chip was added to a raw material storage tank, and 89.4 kg of polypropylene, which is a main raw material, was added thereto. Spunbonded "A", the white beam color spunbonded nonwoven fabric layer is added to 85% by weight of the TiO ₂ to a melt index of 35g / 10 minutes polypropylene is homogeneously kneaded with the master batch chip 0.6kg to be formed, and the Span In the bond "B" beam, 4 kg of a master batch chip in which 20% by weight was uniformly kneaded in polypropylene having a melt index of 35 g / 10 minutes was charged to form a black spunbond nonwoven layer. From the raw material storage tank, the raw material metered and fed constantly in the raw material weighing device installed in each spin beam and each master batch chip are melted and kneaded in the extruder of each spanbond unit, and the filament is spun through spinneret. After forming, it is cooled by cooling air and stretched by suction air under the belt, so that the weight ratio of spin beams "A" and "B" is 1: 1 on the conveyor belt which continuously drives the filament having the fineness of 2.5 denier. By adjusting the RPM of the embossing roll (Emboss roll is 168 ℃, Plate roll is 166 ℃, the pressure is 98dyne / cm crimped under the conditions to give shape stability. Multi-layered polypropylene spunbond nonwoven fabric for mulching with excellent weatherability and fruit colorability of 80g was prepared. Table 1 shows the detailed manufacturing conditions. The characteristics of the non-woven fabric was prepared as shown in Table 2, respectively.

Example  2

In the same manner as in Example 1, except that the white color master batch chip was not added to the spin beam “A” in Example 1, and the natural color of the polypropylene was inherent. A two-sided bicolor (NATURAL & BLACK) multilayered polypropylene spanbonded nonwoven fabric was prepared.

Example  3

Except for adding 5.0 kg of a dark green phase master batch to the spin beam “B” in Example 1, the multi-layered poly structure for mulching having excellent weatherability and fruit colorability with a weight of 80 g per unit area was excellent. Propylene spunbond nonwovens were prepared.

Example  4

Polypropylene, the main raw material, was used in the same manner as in Example 1 except that the melt index (MI) was 75 g / 10 min. Bond nonwovens were prepared.

Comparative Example  One

In the same manner as in Example 1, except that 1.5 wt% of the UV stabilizer-containing master batch chip was used, a double-sided, bi-color, multi-layered polypropylene spunbond nonwoven fabric having a weight of 80 g per unit area was prepared.

Comparative Example  2

Embossing roll (Emboss roll) is 158 ℃, Plate (roll plate) is 156 ℃, the pressure is 88dyne / cm under the same conditions as in Example 1, except that it gives a shape stability, the weight per unit area is 30g A double-sided, bi-color, multi-layered polypropylene spanbonded nonwoven fabric was prepared for mulching.

Comparative Example  3

Except for imparting shape stability by pressing under a pressure of 108 dyne / cm, the same procedure as in Example 1 was carried out to produce a multi-sided bi-color multi-layered polypropylene spunbond nonwoven fabric having a weight per unit area of 130 g.

Comparative Example  4

Except for setting the weight ratio of spanbond "A" (white color) and spanbond "B" (black color) to 0.5: 1.5, the same procedure as in Example 1 was carried out. Spunbond nonwovens were prepared.

Comparative Example  5

Except for setting the weight ratio of spanbond "A" (white color) to spanbond "B" (black color) at 1.5: 0.5, the same procedure as in Example 1 was carried out. Spunbond nonwovens were prepared.

Comparative Example  6

In the same manner as in Example 1, except that the master batch chip having a black color was added to the spanbond “A” to form a single color, and the weight per unit area was 60 g, a multi-sided bi-color multi-layer polypropylene spunbond nonwoven fabric for mulching was prepared.

Comparative Example  7

Polypropylene as a main raw material was prepared in the same manner as in Example 1 except that the melt index (MI) was 15 g / 10 min. Thus, a double-sided, bi-color, multi-layered polypropylene spunbond nonwoven fabric having a weight of 80 g per unit area was prepared.

Comparative Example  8

Polypropylene, the main raw material, was used in the same manner as in Example 1 except that the melt index (MI) was 85 g / 10 min. Nonwoven fabrics were prepared.

Production conditions division Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 Comparative Example 8 UV stabilizer concentration (% by weight) 0.9 0.9 0.9 0.9 0.225 0.9 0.9 0.9 0.9 0.9 0.9 0.9 color W & B N & B W & G W & B W & B W & B W & B W & B W & B B W & B W & B Color weight ratio 1: 1 1: 1 1: 1 1: 1 1: 1 1: 1 1: 1 0.5: 1.5 1.5: 0.5 1: 1 1: 1 1: 1 Nonwoven Unit Weight (g / ㎡) 80 80 80 80 80 30 130 80 80 60 80 80

* W: WHITE, B: BLACK, N: NATURAL, G: GREEN

   division Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 Comparative Example 8 Weight (g / ㎡) 80.1 80.2 80.0 80.1 80.1 30.5 129.6 80.1 80.3 60.0 80.1 80.1 Thickness (mm) 0.51 0.50 0.50 0.51 0.52 0.21 0.71 0.51 0.52 0.39 0.51 0.51 Strength (kg / 5cm MD 18.3 17.9 17.7 18.2 17.6 7.3 19.5 18.6 18.3 17.9 17.5 18.2 CD 10.3 10.5 10.0 10.1 9.7 3.1 11.8 9.9 10.4 9.5 9.5 9.8 Elongation (%) MD 78 81 76 77 80 90 63 84 82 82 81 89 CD 88 91 86 89 90 92 70 95 93 91 90 96 Weatherability (%) MD 91 89 90 90 48 87 91 88 93 90 56 58 CD 88 90 90 89 45 91 88 90 90 87 54 59 HAZE 2.4 2.5 2.4 2.4 3.0 21.9 2.1 2.6 12.6 2.7 2.4 2.4 Manufacturing workability ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ X X Installation workability ◎ ◎ ◎ ◎ ◎ ◎ X ◎ ◎ ◎ ◎ ◎ Coloring ◎ ◎ ◎ ◎ ◎ X ◎ X ◎ △△ ◎ ◎ Herbicide effect ◎ ◎ ◎ ◎ △ X ◎ ◎ X ◎ ◎ ◎

* Manufacturing workability, installation workability, coloring property and herbicidal evaluation criteria ◎: Excellent, △: Normal, X: Poor.

The multi-layered polypropylene spanbonded nonwoven fabric for mulching of the present invention configured as described above solves the embrittlement problem of the nonwoven fabric for removing weeds by solar ultraviolet rays, enabling long-term use, and having excellent breathability and warmth, and discharge of internal moisture. It is easy to reduce the damage such as the occurrence of pests due to wetness during precipitation and rainy season, and it is easy to watering and liquid treatment without removing the nonwoven fabric in the dry season, so that labor can be saved and the weed removal is suppressed by suppressing the penetration of sunlight. While maintaining the efficiency, it is a useful invention to produce a fruit having a high merchandise value by excellent colorability of the fruit by obtaining a lot of light to reach the fruit by the reflection effect of sunlight.

Claims (9)

With respect to the entire polypropylene spunbond nonwoven fabric, one side has a white color layer and the other side has a two-layer structure of a black color layer. The weight ratio of the color is 0.5 to 1.5: 1.5 to 0.5, and the polypropylene resin has a melt index (MI) of 20 to 80 g / 10 minutes, and the HALS ultraviolet stabilizer is used as an ultraviolet stabilizer for all polypropylene resins. Multi-layered polypropylene spunbond nonwoven fabric for mulching, characterized in that it comprises 0.1 to 1.5% by weight. The method of claim 1, wherein the white color layer of the polypropylene spunbond nonwoven fabric is NATURAL COLOR or WHITE COLOR, and the black color layer is BLACK or DARK GREEN, DARK Multi-layered polypropylene spunbond nonwoven fabric for mulching characterized by BLUE COLOR). The multi-layered polypropylene spunbond nonwoven fabric according to claim 1, wherein the polypropylene spunbond nonwoven fabric has a weight per unit area of 40 to 120 g / m 2 and a thickness of 0.1 to 1.0 mm. According to claim 1, wherein the UV stabilizer is multi-layered polypropylene spunbond nonwoven fabric for mulching, characterized in that containing 0.3 to 1.0% by weight. a) melting 5 to 20% by weight of UV stabilizer and 95 to 80% by weight of polypropylene with a kneader to prepare a UV stabilizer-containing master batch chip; b) melt kneading 30 to 85 wt% of the pigment and 15 to 70 wt% of the polypropylene to produce a white batch masterbatch chip; c) melt kneading 15-40% by weight of pigment and 60-85% by weight of polypropylene to produce a black master batch chip; And d) a polypropylene chip having a melt index (MFR) of 20 to 80 g / 10 min is inserted in each of the different extruders, and each extruder contains the master batch chip containing the UV stabilizer obtained in step a) and b to each of the extruders Insert the master batch chips of each color obtained in step) to c), melt, mix and homogenize, melt spinning through spinneret, form filament through cooling and stretching process, and then move continuously. A method for producing a multi-layered polypropylene spunbond nonwoven fabric for mulching, characterized in that the web is formed by multi-layered webs having different colors on both sides of the surface and transported to form a calendar. The method of claim 5, wherein the spinneret of the extruder is composed of 2 to 5 spin beams (SPIN BEAM). The method of claim 5, wherein the calender roll is an embossing roll having a bonding ratio of 10 to 30%, the other side is a multi-layered polypropylene spunbond nonwoven fabric for mulching, characterized in that consisting of a smooth surface roll Way. The method of claim 5, wherein the calender has a pressure of 50-100 dyne / cm and a temperature of 130-170 ° C. 7. The method of claim 5, wherein the pigment of step b) is TiO ₂ and the pigment of step c) is carbon black.

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