KR100346089B1 - A method of preparing mixed drafting paper for plant growth and a mixed drafting paper prepared by the same - Google Patents

Abstract

The present invention relates to a method for producing plant paper for plant growth and to a plant growth paper obtained by the method. The process of the present invention comprises the steps of (a) preparing a single layer blend paper with 20-40% by weight of one or two or more natural pulp and 80-60% by weight of one or more synthetic pulp selected from polyethylene, polypropylene and polyester. ; or (b) bonding the two layers of the blended paper prepared by step (a) together to produce a double layer blended paper; Or (c) jointly dehydrating a single layer blend paper composed of one or two or more natural pulp and the single layer blend paper prepared in step (a) to produce a double layer blend paper; And (d) surface-treating a single layer or a double layer of the mixed paper prepared in (a) or (b) or (c) by using a calender press roll. The plant growth kneading paper obtained by this can prevent disease from the soil at the time of growth of a seedling, and can impart water permeability, breathability, and moderate water retention.

Description

A method of preparing mixed drafting paper for plant growth and a mixed drafting paper prepared by the same}

The present invention relates to a method for producing a plant growth kneading paper and a plant growth kneading paper obtained by the method, and more particularly, to prepare a kneaded paper consisting of a single layer or a double layer composed of synthetic pulp and natural pulp, and heating the same. The present invention relates to a method for producing a plant growth blend paper characterized by surface treatment, and a plant growth blend paper having excellent breathability and water permeability obtained by the method.

Conventionally, seedling boxes were used to grow young seedlings and seedlings before transplanting rice seedlings.

In the method of growing seedlings which are grown by spraying water for about 20 days in a multi-stage stack on a mold in a greenhouse where temperature and humidity are controlled in order to grow in large quantities in a short time, Pallets must be laid in order to prevent the soil and soil from flowing through the holes, so the method of making seedlings using the existing seedling box is to place kraft paper on the bottom of the seedling box and fill the soil and soil (1) , (2) was used to fill the soil and soil by laying a synthetic film on the bottom of the seedling box, and to fill the soil and soil (3). However, the method of (1) is disadvantageous in that the kraft paper rug is decomposed by the water supplied during the growing period, so that the formation of the mat required when entangled with the root of the seedling is loosened, and the method of (2) above is a film Due to its characteristics, the oxygen supply is insufficient in the roots during the growth process, and the growth of the roots is poor.The rice grows poorly after mechanization and rice paddy. When sluggish and too much moisture, roots are rotted and pests are suffered, so growth management is very difficult. In addition, the method of (3) is easy to supply oxygen from the seedling box to the root has the advantage of rapid growth of the root, but the process of removing the nonwoven from the root mat when the root is entangled with the nonwoven fabric is very cumbersome Root damage is severe, such as cutting off the roots during the removal of the nonwoven fabric.

On the other hand, in the seedling growth method of making a mockup from soil in rice fields and placing seedlings on it and supplying water directly to the rice paddies for 30 days, the method for making seedlings is to use any tool on the inner bottom of the seedling box. Filling soil and soil without laying was used. At this time, after ingesting the nutrients on the seedlings, the roots go down through the holes in the seedling box (Fig. 1), and the roots fall into the soil of the mockup, and the growth takes place actively. Although it takes considerable manpower to separate it from the soil, and also for machine transfer, the roots formed in the seedling box are generated only by the roots formed in the seedling box (Fig. 4). The mat was then rolled up and used for machine transfer. In other words, during the seeding process, the seedlings are severely damaged, and the roots are slowed by the cutting of the roots, so that the rice grows, nutrients such as agricultural water and fertilizers are needed. In order to solve the above problem, before the seedlings are placed on the ridges, the seedlings are made by the method of the above (3), and the seedlings are placed on the ridges to grow, but the nonwoven fabric is basically grounded when forming the web. This very large layer consists of (Fig. 2) rather, the roots tangled with non-woven fibers and entangled roots are rooted in the soil of the groin in search of nutrients, so that the seedlings that have been grown are easily separated from the angsi seedling There is a disadvantage in that the seedlings are severely damaged and the roots are severely damaged by cutting the roots, which impedes the growth of rice.

In order to solve the shortcomings of the conventional seedling growth method (I) and the seedling method (II), the present inventors have excellent root growth with excellent permeability and excellent breathability, good mat formation, and root cutting during transplanting. As a result of researches to develop a material that forms a mat to facilitate the migration, single or double layers of mixed pulp made of synthetic pulp and natural pulp used for food packaging and fruit cultivation bags (Korean Patent Nos. 150270, 153073 and Surface treatment of 153412) has found that the above object can be achieved and the present invention has been completed.

Accordingly, it is an object of the present invention to provide a method for producing plant paper for plant growth.

Still another object of the present invention is to provide a vinegar for plant growth prepared by the above method.

1 shows a seedling box.

2 shows a nonwoven fabric.

Figure 3 shows the plant growth kneading paper of the present invention.

Figure 4 shows the roots appearing under the seedling box when only the seedling box is applied to the nail spot.

Figure 5 shows the roots appearing under the seedling box when the plant growth kneading paper of the present invention is applied to the seedling box.

In order to achieve the above object, the production method of the present invention comprises a) 20 to 40% by weight of one or two or more natural pulp and 80 to 60% by weight of one or more synthetic pulp selected from polyethylene, polypropylene and polyester. Preparing a blended paper; And b) characterized in that it comprises a step of surface treatment using the calender paper prepared in the step (a) using a calendar press roll. In addition, the production method of the present invention, before the step (b), 20 to 40% by weight of one or two or more kinds of natural pulp and one or more synthetic pulp 80 to 60 in the single layer blend paper of step (a) Bonding and dehydrating another single-layer kraft paper composed of weight percent to prepare a double-layer kraft paper or paper made of one or two or more natural pulp in the single-layer kraft paper of step (a) above It is characterized in that it further comprises a step of manufacturing a double-layer kneaded paper by bonding dehydration.

In addition, the plant growth kneading paper of the present invention is a single layer kneading paper consisting of 20 to 40% by weight of one or two or more kinds of natural pulp and 80 to 60% by weight of one or more synthetic pulp selected from polyethylene, polypropylene and polyester. ; Or a bilayer blended paper consisting of two layers of mixed paper consisting of 20 to 40% by weight of one or two or more kinds of natural pulp and 80 to 60% by weight of one or more synthetic pulp selected from polyethylene, polypropylene and polyester. It is a bilayer blended paper of honcho paper composed of paper and one or two or more kinds of natural pulp. The honcho paper is surface-treated with a calender press roll, and the pores are small and uniform, and the surface is smoothly treated.

Hereinafter, the present invention will be described in more detail.

According to the present invention, in order to give excellent permeability and breathability as a plant growth kneading paper, synthetic pulp and natural pulp are kneaded to prepare a single or double layer kneading paper. Plant growing kneaded paper is made from mixed pulp consisting of 20-40% by weight of one or two or more natural pulp and 80-60% by weight of one or more synthetic pulp selected from polyethylene, polypropylene and polyester, because If the content of natural pulp is less than 20% by weight, the pores are blocked after heat treatment, and the drainage and aeration are not good, and the growth of the roots is impeded. This is because the seedlings are torn by growth. Here, the paper is manufactured to have a total basis weight of 30 ~ 150g / cm ² , if the basis weight is less than 30g / cm ² , even if the surface treatment, the pores are too large to prevent rooting and difficult to prevent rooting and tearing due to careless handling during use If the basis weight is more than 150g / cm ² pore is too small because the surface treatment to prevent rooting is blocked because the pores are clogged because there is a problem that water and air can not penetrate. Seedlings mixed with synthetic pulp and wood pulp increase dry tensile strength and wet tensile strength, and when one type of synthetic pulp is used, the melting point of the synthetic pulp is low, and when two or more kinds of synthetic pulp are used, By heating the surface to the temperature between the melting points of the high melting point pulp, the pore size of the surface of the blended paper becomes smaller and more uniform, and the surface becomes smooth while maintaining the breathability and permeability formed by the existing natural pulp. Makes good. In addition, synthetic pulp acts as a binder on the natural pulp is excellent in dimensional stability and improved water resistance to be used repeatedly.

The production method can produce single layer blended paper consisting of natural pulp and synthetic pulp using only long or circular net paper machine, and 20-40% by weight of natural pulp and polyethylene, polypropylene and poly 80-60 wt% of one or more synthetic pulp selected from esters may be used to prepare a single layer of mixed paper, and the two single layers may be bonded and dehydrated to prepare a double layered mixed paper. In addition, one of the long paper paper machine or ring paper paper machine is composed of one or two or more kinds of natural pulp 100% single-layer blended paper, and the other one natural pulp and one or more synthetic pulp selected from polyethylene, polypropylene and polyester The mixture may be composed of 20 to 40:80 to 60% by weight of a single layer blend paper, and the two single layers may be bonded and dehydrated to prepare a double layer blend paper. In the case of a monolayer, it is preferable to use it for seedling raising of seedlings with a large pore size and a good permeability, and in the case of a double layer, the pore size is small and dense and good water retention.

Synthetic pulp used in papermaking according to the invention is produced from polyolefin-based resins such as homopolymers or copolymers of ethylene or propylene, for example polyethylene, polypropylene, ethylene propylene copolymers and polyester resins. The resin is prepared as a fine fibrous material by melting in a solvent and spinning through a nozzle using the resin as a main raw material. In this case, it is preferable to attach 2.5 wt% of hydrophilic polyvinyl alcohol to impart dispersibility in water not possessed by a synthetic resin. The fiber length of the synthetic pulp is 0.1-10 mm.

Synthetic pulp is used alone or in combination of two or more synthetic pulp having a melting point difference for the preparation of mixed paper of the present invention. When one type of synthetic pulp is used in the preparation of the blended paper of the present invention, the surface of the blended paper is smoothed while maintaining the breathability and permeability formed by the existing natural pulp by heating the surface at the melting point of the synthetic pulp to prevent rooting. However, there are disadvantages in that the working conditions are difficult and the uniformity of the surface state of the product is lowered. Therefore, more preferably, by mixing two or more kinds of synthetic pulp having different melting points properly by heating the surface at a temperature between the melting point of the low melting point pulp and the high melting point pulp, the pore size can be easily adjusted under more stable working conditions, thereby providing a smooth surface treatment. In this case, when the mixing amount of the low melting synthetic pulp is large, the pores are filled to prevent permeation and permeation, and when the mixing amount is small, the effective surface treatment to prevent root penetration may not be achieved. Synthetic pulp in the present invention is a polyethylene (low melting point: about 135 ℃), polypropylene (intermediate melting point: about 165 ℃) and polyester (high melting point: about 265 ℃) each alone or two or more selected from these It can be mixed and composed of two kinds of polyethylene, polypropylene or polyethylene and polyester or polypropylene and polyester mixed composition or three kinds of polyethylene and polypropylene and polyester, the two kinds of synthesis The pulp composition is polyethylene: polypropylene = 10-50: 90-50% by weight, polyethylene: polyester = 10-50: 90-50% by weight, and polypropylene: polyester = 10-50: 90-50% by weight. In the% ratio, the three synthetic pulp composition is polyethylene + polypropylene: polyester = 10-50: 90-50% by weight or polyethylene: polypropylene + polyester = 10-50: 90-50 weight% ratio.

Natural pulp used in the preparation of honcho paper according to the present invention may be used by mixing one or two or more selected from wood pulp, cotton pulp, bamboo pulp. In particular, wood pulp is good, and representative examples thereof include mechanical pulp, chemical pulp, chemical kraft pulp or semichemical pulp.

In order to obtain optimal physical properties in the present invention, dehydrated honji paper produced in a paper machine is dried in a drier and heat treated. The heat treatment method may be carried out using a heating roll of a conventional long mesh type or circular mesh type paper machine, and may also be performed by a hot air heat treatment machine or other infrared heater. Most preferably, it is processed in a hot air heat treatment machine. The heat treated honcho paper is surface treated to control root permeability, and it is most preferable to use a separate calender press roll to make the pores small and uniform and to smooth the surface. The surface treatment temperature in calender press roll is determined by the type of synthetic pulp used.When one synthetic pulp is used, the melting point of the synthetic pulp raw material, and when two synthetic pulp are used, It is made at the intermediate temperature between the melting point of the melting point and the high melting point synthetic pulp. When three kinds of synthetic pulp are used, the treatment temperature is determined depending on the content ratio, but is approximately the temperature between the low melting point and the middle melting point, or The treatment temperature is determined at temperatures between high melting points. In the present invention, it is more preferable to use two or more kinds of synthetic pulp in order to easily control the heating surface treatment conditions and to make the blend paper surface state and the pore size uniform. On the other hand, it is also possible to bond the calender press roll to a heating roll, but it is difficult to perform delicate surface treatment due to surface adhesion caused by pressure and shorten the life of press roll due to heat. It is preferable to process and use it.

Hereinafter, the present invention will be embodied through Examples and Comparative Examples. However, the present invention is not limited only to the following examples.

<Example 1>

After adding 40% natural pulp, kraft wood pulp, 30% high density polyethylene synthetic pulp and 30% polypropylene synthetic pulp to dissociated paper in a long paper machine, fully beaten it, mix it with a basis weight of 30g / cm ² , and proceed through dehydration and dryer process. The surface was heated to 135-160 ° C. in a calendar press roll. The physical properties (tensile strength, wet tensile strength, permeability, permeability, and coefficient of friction; the same below) and the results of application of the seedling box (root permeation, seedling tension and seedling time; the same) are shown in Table 1. Indicated. The application of seedling box is to put seedlings in the bottom of the seedling box, fill the soil and soil, sow seeds, put seedling boxes in the rice paddy, grow the seedlings and grow the seedlings (usually 35-45 days for seedlings). The case takes 10-15 days).

<Example 2>

In Example 1, 20% natural pulp kraft wood pulp and 20% manila mapulp were composed of 30% polyester synthetic pulp instead of 30% polyethylene synthetic pulp. Table 1 shows the results of evaluation of the properties and application of the seedling box of the single-layer kneaded paper prepared and manufactured in the same manner except that the basis weight was 60 g / cm ² .

<Example 3>

In Example 1, instead of 40% natural wood kraft wood pulp 40% manila hemp pulp, synthetic pulp composed of high density polyethylene synthetic pulp 10%, polypropylene synthetic pulp 20%, polyester synthetic pulp 30%, Table 1 shows the properties of the monolayer kneaded paper prepared and manufactured in the same manner as in Example 1, and the results of the application of the seedling box in the calender press roll except that the surface weight was 120g / cm ² by surface treatment at 135 to 190 ° C. .

<Example 4>

The Kraft wood pulp and 10% of Manila hemp pulp, 10% of natural pulp to being ring Glauber's salt, high-density polyethylene synthetic pulp of 30% and a polypropylene into the synthetic pulp to 50% of a synthetic pulp, that producing the horn propelled by basis weight 40g / cm ² Except for the same, the physical properties of the single-layer blended paper manufactured and manufactured in the same manner as in Example 1 and the results of the application of the seedling box are shown in Table 1.

Example 5

In Example 4, a natural pulp, a Kraft wood pulp of 15% and a Manila hemp pulp, 5%, and composed of a synthetic pulp to 50% high density polyethylene synthetic pulp of 30% and the polyester synthetic pulp in the same manner except that a basis weight of 80g / cm ² Table 1 shows the properties and application results of the seedling box application of the prepared single-layer knotweed paper.

<Example 6>

In Example 4, 5% natural pulp kraft wood pulp and 15% manila mapulp were composed of synthetic pulp with high density polyethylene synthetic pulp 30%, polypropylene synthetic pulp 20% and polyester synthetic pulp with a basis weight of 130 g / cm. Table 1 shows the properties of the single-layer blended paper produced and manufactured in the same manner except for ² , and the result of the application of the seedling box.

<Example 7>

In the long paper machine, 20% natural pulp kraft wood pulp and 10% manila mapulp are composed of synthetic pulp, 25% high density polyethylene synthetic pulp, and 45% polypropylene synthetic pulp. Grassland in cm ^2, and hwanmang into groups dissociating pulp of fourdrinier paper machine with the same configuration in a paper machine were thoroughly beaten, by a bonding propelled being propelled to exit from the pulp phase through the cylinder in the head box of being ring Glauber's salt in Chapter Glauber's salt being After the dehydration and drying process, heat treatment was performed at a calender press roll at 135 to 160 ° C. to prepare a blended paper having a basis weight of 80 g / cm ² . Table 1 shows the properties of the prepared double layer kneaded paper and the result of application of the seedling box.

<Example 8>

30% natural kraft wood pulp and 70% manila mapulp are put into dissociated paper in a persimmon papermaking machine, fully reflecting the confession, and the paper is weighed at 70 g / cm ² . 10% high-density polyethylene synthetic pulp and 50% polypropylene pulp are added to the dissociation furnace, and then fully pulverized. After passing through a calender press roll, the surface was heated to 135 to 160 ° C. to prepare a kneaded paper having a basis weight of 140 g / cm ² . Table 1 shows the properties of the prepared double layer kneaded paper and the result of application of the seedling box.

Example 9

In Example 8, only 100% of manila manpulp, which is a natural pulp, was used to make paper at a basis weight of 20 g / cm 2, and the ring manor was 15% of kraft pulp, 15% of manila manpulp, and a high-density polyethylene which is a synthetic pulp. Table 1 shows the physical properties and application results of the seedling box application of the bilayer kneaded paper prepared in the same manner except that the total basis weight was 40 g / cm 2 composed of 35% pulp and 35% polyester pulp.

<Example 10>

In Example 8, 70% natural pulp kraft pulp and 30% manila mapulp in papermaking paper machine were used for papermaking at a basis weight of 50 g / cm 2, and the papermaking papermaking machine made up of 30% natural pulp kraft pulp, 10% manila mapulp, It is composed of 20% of polypropylene pulp, 40% of polyester pulp, which is synthetic pulp, and mixed with a total basis weight of 100g / cm 2, and then surface treated at 160 ~ 190 ℃ by calender press roll. Table 1 shows the results of the evaluation of the properties and application of the seedling box.

<Example 11>

In Example 8, only 100% of natural pulp kraft pulp was used in papermaking paper, and paper was weighed at a basis weight of 50 g / cm 2, and the circular paper paper machine was made of natural pulp of 20% kraft pulp, 10% manila manpulp, and synthetic pulp of high density polyethylene 15 Physical properties of double-layered blended paper prepared in the same manner, except that the mixture was composed of%, polypropylene pulp 20%, and 35% polyester pulp and mixed with a total basis weight of 100 g / cm 2, and then surface-treated at 160 to 190 ° C. in a calender press roll. Table 1 shows the results of the application and the seedling box application.

<Example 12>

In Example 8, the natural pulp is 40% manila manpulp, the synthetic pulp is composed of high density polyethylene 25%, polypropylene pulp 25%, and polyester pulp 10%. Table 1 shows the properties and application results of the seedling box application of the double-layer blended paper prepared in the same manner except that 100% of the graft pulp, which is a natural pulp, was made with a total basis weight of 60g / cm 2.

Example 13

In Example 8, 10% natural pulp kraft pulp, 20% manila mapulp, 30% synthetic pulp, 30% polypropylene pulp, and 40% polypropylene pulp were used for papermaking. Table 1 shows the physical properties and application results of the seedling box application of the bilayer kneaded paper prepared in the same manner except that 30% of the pulp, kraft pulp, and 70% manila mapulp were used.

<Example 14>

In Example 8, the long perforated paper machine was composed of natural pulp kraft pulp 30%, manila mapulp 5%, synthetic pulp 15% high density polyethylene, and polyester pulp 50%, and the basis weight was 60g / cm 2, Table 1 shows the properties and application results of the seedling box application of the bilayer blended paper prepared in the same manner except that 70% natural kraft pulp and 30% manila mapulp were used as the total basis weight of 120 g / cm 2.

<Example 15>

In Example 8, the long paper paper machine was composed of natural pulp kraft pulp 10%, manila malp pulp 15%, synthetic pulp polypropylene pulp 15%, polyester pulp 60% and papermaking at a basis weight of 40 g / ㎠, The natural properties and seedlings of the double-layered blended paper prepared in the same manner except that 100% of manila manpulp, which is a natural pulp, was mixed with a total basis weight of 80 g / cm 2, and then surface-treated at 160-190 ° C. in a calender press roll. Box application evaluation results are shown in Table 1.

<Example 16>

In Example 8, 25% natural pulp kraft pulp and 75% synthetic pulp polypropylene pulp were prepared in a long paper machine, and the paper weight was 40g / cm 2, and only 100% kraft pulp, which is a natural pulp, was used in a ring paper machine. Table 1 shows the physical properties and application results of the seedling box application of the same double-layer kneaded paper, except that the mixture was heated to a total basis weight of 80 g / cm 2, and then surface-treated at 160 to 190 ° C. in a calender press roll.

<Example 17>

In Example 8, 25% of natural pulp kraft pulp and 75% of synthetic pulp polyester pulp was made in papermaking paper, and the paper weight was 40g / cm2, and only 100% of kraft pulp, which is natural pulp, was used in circular papermaking paper. Table 1 shows the properties and application results of the seedling box application of the same double-layer kneaded paper, except that after the kneaded paper with a total basis weight of 80 g / cm 2, the surface was heated at 260 to 290 ° C. in a calender press roll.

Comparative Example 1

In Example 8, except that surface heat treatment is not performed with a calender press roll, the physical properties of the same manufactured honcho paper and the result of application of the seedling box are shown in Table 1.

Comparative Example 2

Table 1 shows the results of growing using only seedling boxes as in normal farms.

Comparative Example 3

Table 1 shows the properties and application results of the polypropylene agricultural nonwoven fabric (base weight: 80 g / cm ² ) used for seedling boxes.

The physical properties measured in Examples and Comparative Examples of the present invention were measured by the following method.

(1) Tensile strength was tested according to KS M 7014.

(2) Wet tensile strength was tested according to KS M 7027.

(3) The air permeability was tested according to KS M 7020.

(4) The water permeability was set at the bottom of the glass tube having a diameter of 5 cm, and the time for passing 100 ml of water was measured.

(5) Friction coefficient was tested according to ASTM D 1894.

(6) Root penetration observation

(Double-circle): No rooting, and a root does not get stuck in seedling ground.

(Triangle | delta): Although there is no rooting, roots get stuck in a seedling and it is impossible to reuse a seedling.

×: rooting occurrence

(7) Seedling tension (force needed to remove one seedling box from the nail) was measured using a spring balance.

(8) The seeding time measured the time taken to remove 30 seedling boxes.

As described above, the use of the plant growth kneading paper according to the present invention is imparted with permeability, breathability and adequate water retention during the growth of the seedlings, the seedlings have healthy roots, the seedling box can be easily removed from the nail spot, roots This can be done without cutting off the cutting edge, which saves time and labor. In addition, the growing poncho paper is very economical because it can be recovered and reused after use.

Claims (5)

The following processes (a) and (b): a) a process of preparing a blended paper with 20 to 40% by weight of one or two or more types of natural pulp and 80 to 60% by weight of one or more synthetic pulp selected from the group consisting of polyethylene, polypropylene and polyester; And b) a method for producing a plant growth kneading paper, characterized in that it comprises a step of surface treatment using a calendar press roll. The method according to claim 1, wherein before the step (b), 20-40% by weight of one or two or more natural pulp and polyethylene, polypropylene, and polyester are selected from the blended paper prepared in step (a). A method for producing a plant growth kneading paper, characterized in that it further comprises a step of bonding and dehydrating kneading paper composed of 80 to 60% by weight of one or more synthetic pulp. The method of claim 1, wherein before the step (b), further comprising the step of bonding the dehydrated paper made of one or two or more natural pulp to the kraft paper prepared in step (a) Method for producing dragon honchoji. The method according to claim 1 or 2, wherein two kinds of polyethylene and polyester are used in a ratio of polyethylene: polypropylene = 10-50: 90-50% by weight when using two kinds of polyethylene and polypropylene as the synthetic pulp. Polyethylene: Polyester = 10 to 50: 90 to 50% by weight, Polypropylene: Polyester = 10 to 50: 90 to 50% by weight When using three kinds of propylene and polyester, polyethylene + polypropylene: polyester = 10-50: 90-50% by weight or polyethylene: polypropylene + polyester = 10-50: 90-50% by weight Method for producing a plant growing paper characterized in that. The method according to any one of claims 1 to 3, wherein the total basis weight of the blend paper is 30 to 150 g / cm ² .