JPH0856477A - Rockwool molding medium and manufacturing method thereof - Google Patents

Abstract

PURPOSE: To obtain a culture medium of formed rock wool containing a fertilizer homogeneously present in the whole without falling off the fertilizer. CONSTITUTION: This culture medium of formed rock wool is obtained by sprinkling a solid fertilizer over the top surface of fleeces of the rock wool uniformly sprinkled with a binder in fiberizing a raw material mixture into the rock wool, laminating the fleeces sprinkled with the solid fertilizer, hardening the binder by heating, forming a mat A1 and cutting the resultant mat to a required thickness.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rockwool molding medium for plant cultivation and an improvement in its production method.

[0002]

2. Description of the Related Art Conventionally, instead of a medium composed of natural soil,
Rockwool molding medium for plant cultivation using rockwool is often used. The main reasons that rock wool is used as a medium for plant cultivation are that it has excellent water retention and air permeability, is lightweight, and can be industrially mass-produced. However, unlike soil, rockwool does not contain fertilizers by itself, and has a large CEC (cation exchange capacity, fine particles of viscous soil, and coarse particles of sandy soil or rockwool show a small value). The one with a large CEC has a large ability to absorb and retain nutrients and has no ability to retain fertilizer. Therefore, when rock wool is used for other than solution cultivation, sprinkle an aqueous solution of fertilizer on the surface or inside the rock wool. To add fertilizer.

[0003]

Known techniques for adding fertilizer to rock wool include, for example, Japanese Patent Publication 1-5301.
Japanese Unexamined Patent Publication No. 3 discloses a means in which solid fertilizer or an aqueous solution thereof is sprinkled on the surface portion of the rock wool molded body or the solid fertilizer is pressed into the surface portion after molding the rock wool. However, such a fertilizer addition means adds an extra step. When an aqueous solution of fertilizer is used, the aqueous solution itself is acidic, so it is alkaline (pH 7.5-10.
Reacts with rock wool of 0), corrodes rock wool,
It has the drawbacks of lowering its strength, corroding the steel material of the manufacturing equipment used, and requiring a large amount of drying energy.

Further, Japanese Patent Publication No. 3-2490 / 1990 discloses a means for spraying rock wool with an acid or an acid-adjusted adhesive for molding. But,
Normally, in terms of production efficiency, the fertilizer is sprayed as an aqueous solution on the rock wool in the air immediately after the production of rock wool, but when the rock wool and fertilizer are not mixed homogeneously and cut into cubes of a predetermined size, the fertilizer Cubes with high content and cubes with low fertilizer content are created.
There is also a problem that acidic fertilizers corrode the steel materials forming the production line such as the cotton collection chamber.

[0005]

It is an object of the present invention to provide a rockwool molding medium which simplifies the manufacturing process, and in which the added fertilizer is homogeneously present throughout the entire body, the fertilizer does not fall off, and the fertilizer effect continues for a long time. The main purpose is to provide a manufacturing method thereof.

[0006]

The rock wool molding medium according to the present invention comprises a rock wool fleece sprinkled with a binder evenly at the time of fiber production, and a solid fertilizer is sprinkled on the upper surface of the fleece. The gist is that the binder is laminated on and the binder is heat-cured.

Further, the gist of the present invention is that the solid fertilizer coated with a powdery binder is used as the solid fertilizer.

Further, the method for producing a rockwool molding medium according to the present invention comprises a step of forming a rockwool fleece uniformly spread with a binder at the time of fiber-making, and a solid fertilizer or powdery binder on the upper surface of the fleece. The gist of the present invention is to sprinkle the coated solid fertilizer, stack a required number of fleeces sprinkled with the fertilizer, compress and heat the fleece to form a mat.

[0009]

In the rockwool molding medium of the present invention, the solid fertilizer is present between the fleeces that are laminated and formed into a mat, so that the fertilizer is present substantially uniformly throughout the mat, There is no dropout.

According to the method of using a solid fertilizer coated with a powdery binder and forming a film around the solid fertilizer in the subsequent heat curing step, the irrigation method is used. The fertilizer gradually dissolves when you do.

Further, according to the method for producing a rockwool molding medium of the present invention, it is possible to easily obtain a rockwool molding medium in which solid fertilizer is homogeneously distributed and which does not fall off from the rockwool mat by a simple process. You can

[0012]

EXAMPLES The present invention will be described in detail below based on examples.

Example 1 A raw material mixture consisting of pig iron slag, basalt, dolomite, etc. was dissolved in a cupola, and, at the same time as fiber formation, a phenol resin as a binder was added in an amount of 1.5 wt% with respect to the fiberized rock wool. Sprayed in proportion, thickness 33mm, density 2
0 kg / m ³ of fleece was obtained, and then 66 g / m of fertilizer consisting of ammonium sulfate, potassium phosphate, potassium sulfate was applied on the fleece.
² sprinkles and then 30 layers of fleece sprinkled with fertilizer on top of each other to compress and heat the phenolic resin to a thickness of 3
00mm, width 580mm, length 1000mm, density 65kg / m
³ mat A ₁ (see FIG. 1) was obtained. This is cut in the length direction and turned over 90 degrees so that the fiber direction (the direction of the fibers forming the fleece) is the vertical direction and trimming is performed to obtain a width of 280 mm, a length of 580 mm and a thickness of 17 mm. Rockwool molding medium A ₂ for raising seedlings (see FIG. 2) was obtained.

Example 2 A raw material mixture consisting of pig iron slag, basalt, dolomite, etc. was dissolved in a cupola, and at the same time as fiber formation, a phenol resin as a binder was added in an amount of 1.5 wt% based on the fiberized rock wool. Sprayed in proportion, thickness 33mm, density 2
0 kg / m ³ of fleece was obtained, which was matted by the pendulum device shown in FIGS. 5 and 6.
First, the above-mentioned fleece is placed on the endless traveling belt conveyor 1 arranged horizontally, and the solid fertilizer coated with the powdery binder obtained by mixing with the mixer is sprinkled from the spout mouth 2 onto the fleece at 67 g / m 2. ² sprinkles, then, while passing the fleece between the pendulum type traveling belt conveyors 3, 3 which can be reciprocated in the lateral direction (arrow direction) at the lower part of the end side of the belt conveyor 1, its lower end discharge port By the operation of dropping on the endless traveling belt conveyor 4 arranged on the side, the fleece is reciprocated in a direction orthogonal to the transfer direction of the belt conveyor to form a zigzag shape. 30 sheets are piled up, the phenol resin is heat-cured while being compressed, and the powdery binder coated with solid fertilizer is heat-cured to form a film. , Thickness 300 mm, width 580 mm, length 1000 mm, mat A ₃ Density 65 kg / m ³ (see FIG. 3)
I got This was cut in the length direction and turned over 90 degrees so that the fiber direction was in the vertical direction, and trimming was performed to obtain a rock wool molding medium A ₄ for growing seedlings having a width of 280 mm, a length of 580 mm and a thickness of 17 mm (Fig. 4). See).

Comparative Example 1 Example 1 was repeated except that an aqueous solution was used as the fertilizer, and the fertilizer was sprayed on rock wool in the air immediately after fiber making.
The same rockwool molding medium was obtained by the same method as described above. The rock wool molding mediums of Examples 1 and 2 and Comparative Example 1 were used as specimens, and as shown in FIG. 7, the diameter of the specimen A was 50 mm from the nine locations (a) to (li). Samples with a thickness of 17 mm were taken, water of 3 times the volume was added to each, and the electrical conductivity of the solution (electrical conductivity in this case means that if salts are dissolved in water, electricity easily flows, The larger the value, the higher the temperature of the dissolved fertilizer component in water.) Is shown in Table 1. As shown in Table 1, Example 1,
It was confirmed that the rockwool molding medium No. 2 had a smaller variation in electric conductivity than the medium of Comparative Example 1 and the fertilizer was homogeneously mixed.

[0016]

[Table 1]

In addition, Table 2 shows the results of measuring the change with time of electric conductivity by adding three times the volume of water to the sample collected. As shown in Table 2, the increase in electrical conductivity after hydration in Example 2 uses the solid fertilizer coated with the powdery binder, and the binder is spread around the solid fertilizer by the heating step to be performed later. Since a film was formed, it was confirmed that the solid fertilizer was more gradual than the non-coated solid fertilizer, and the fertilizer was slowly eluted.

[0018]

[Table 2]

[0019]

Industrial Applicability As described above, the rock wool molding medium according to the present invention makes the rock wool fleece by evenly sprinkling the binder at the time of rock wool making, and solid fertilizer, or After spreading the solid fertilizer coated with the powdery binder, the fleece is laminated, compressed, and heat-cured to form a mat, so that the solid fertilizer exists between the fleeces and the entire mat is covered. It is distributed substantially homogeneously and there is no fall of fertilizer from the mat.

When fertilizer coated with a powdery binder is used, the binder forms a film around the solid fertilizer in the subsequent heating step. It can be gradually eluted.

According to the method for producing a rockwool molding medium of the present invention, it is possible to easily obtain a rockwool molding medium in which solid fertilizer is homogeneously distributed and does not fall off from the rockwool mat by a simple process.

In addition, according to the method for producing a rockwool molding medium of the present invention, it comprises the above steps,
As described in Japanese Patent Publication No. 1-53013, the number of steps is not increased, and the acidic fertilizer aqueous solution is not used as described in Japanese Patent Publication No. 1-53013 and No. 3-2490. It does not corrode the steel material, and does not require a large amount of drying energy.

[Brief description of drawings]

FIG. 1 is a side view of a rock wool mat showing an embodiment of the present invention.

FIG. 2 is a side view of a rockwool molding medium obtained by cutting from the mat of FIG.

FIG. 3 is a side view of a rock wool mat showing another embodiment of the present invention.

FIG. 4 is a side view of a rockwool molding medium obtained by cutting from the mat of FIG.

5 is a front view of a pendulum device for making the mat of FIGS. 3-4. FIG.

FIG. 6 is a side view of the device.

FIG. 7 is an explanatory diagram of a sampling position of a practical sample.

[Explanation of symbols]

A ₁ , A ₃ Rockwool mat A ₂ , Rockwool molding medium obtained by cutting from A ₄ mat A Sample 1 Horizontal endless traveling belt conveyor 2 Solid fertilizer spout 3 Pendulum type endless traveling belt conveyor 4 Horizontal arrangement Endless traveling belt conveyor

Front Page Continuation (72) Inventor Ikuya Kumagai 3-11-9 Yoshida, Nagano City, Nagano Prefecture (72) Masami Kobayashi 1563 Kazama Soybean Island, Nagano City, Nagano Prefecture

Claims (3)

[Claims] 1. A solid fertilizer is sprinkled on the upper surface of a rock wool fleece which is uniformly sprinkled with a binder at the time of fiber production, and the fleece of the solid fertilizer sprinkle is laminated in a mat shape, and the binder is heat-cured. Rockwool molding medium characterized by 2. The rockwool molding medium according to claim 1, wherein the solid fertilizer is a solid fertilizer coated with a powdery binder. 3. A step of forming a fleece of rock wool in which a binder is uniformly sprinkled at the time of fiber production, and solid fertilizer or a solid fertilizer coated with a powdery binder is sprinkled on the upper surface of the fleece, and the fertilizer is applied. And a step of stacking a required number of fleeces sprinkled with and compressing and heating to form a mat-like shape.