JPH0157930B2 - - Google Patents

Description

Detailed Description of the Invention A. Field of Industrial Application The present invention relates to a seedling-raising block obtained by cutting a mineral fiber pine, and when the seedling-raising block is housed in a floor box and placed under seedling-raising conditions, the seedling-raising form is This is a seedling-raising block that does not cause deformation, maintains good seedling-raising performance, and can improve workability with a rice transplanter, especially as a paddy rice nursery.

B. Prior art It is already known that mineral fiber pine such as rock wool, slag wool, and glass wool can be used as a plant cultivation medium, and especially when used for raising seedlings, blocks of mineral fiber pine cut into appropriate dimensions are used. There is.

The above-mentioned mineral fiber mat is made by melting mineral raw materials and blowing them away using centrifugal force or jets of air to form fibers, which are then placed on a net conveyor together with a spray adhesive (mainly thermosetting resin adhesives such as phenol resin are used). It is manufactured by collecting and heat-treating the cotton in layers.
Therefore, the fibers constituting the mat are laminated in multiple layers oriented in random directions parallel to the mat surface, and the fibers are partially bonded to maintain their shape.

When this mineral fiber pine is cut and blocks are used as seedlings, the fibers are oriented horizontally, resulting in poor permeation of irrigation water, inhibition of plant root growth, and low pressure resistance in the thickness direction. It had a tendency to be compressed by the medium, and was insufficient as a culture medium. In order to avoid this problem, a seedling growing block has been proposed in which the laminated surface of the random web is oriented vertically.

C. Problems to be Solved by the Invention In the conventional seedling raising block, which is made by cutting a block of mineral fiber pine with its random web layered surface vertically, most of the constituent fibers are oriented in the thickness direction, and the block has excellent water permeability and pressure resistance. Although it is preferable in terms of shape retention, etc., the connectivity in the planar direction is reduced, making it more likely to cause cracking and collapse, and the dimensional stability in the stacking direction of the random web is low, and shrinkage in the planar direction occurs when it contains water. When the seedlings are placed in a nursery box, irrigation creates a gap between the inner wall of the box and the sown rice seeds and soil cover fall into the gap, making it difficult to sow the seeds evenly. At the same time, shrinkage and deformation further increased, resulting in uneven growth of seedlings and problems such as uneven density of seedlings. This problem causes fluctuations in the number of seedlings to be planted, particularly when mechanical rice planting is carried out by mounting rice seedling boxes on a rice transplanter, and a solution to this problem has been desired.

D. Means for Solving the Problems The present invention has succeeded in eliminating the problem of unidirectional shrinkage in the planar direction of the mineral fiber seedling-raising block in which the random web lamination surface is vertical.

That is, in the present invention, a plate-like body obtained by bending and folding a mat in which random webs of mineral fibers are laminated into a continuous wave shape is cut along a plane perpendicular to the generatrix of the wave shape, and the blocks are cut. This is a mineral fiber seedling raising block for box floor use, characterized in that the random web lamination surface is vertical with the cut surface being the top or bottom surface.

As shown in the perspective view of FIG. 1, the seedling-raising block of the present invention has an upper surface A where the ends of the fibers formed by laminating a random web of mineral fibers bent and folded in a continuous wave pattern are exposed, and a random web-like flat surface. It is a rectangular parallelepiped with a side surface B and a front surface C in which the end surface of the random web laminate is vertically exposed, and the opposing surfaces have the same surface condition.

FIG. 2 is a perspective view of a mineral fiber plate for manufacturing the above-mentioned seedling-raising block, in which random web laminated mats obtained by a conventional manufacturing method are assembled by bending and folding them into a continuous wave shape. It is cut into square plates.

The top surface B′ is a random web-like plane, A′ shows the fiber ends in which the random web laminate is bent and folded into a continuous wave shape, and the front surface C′ shows the end surface of the random web laminate in the horizontal direction. It's showing up.
Then, this plate-like body is cut into parts at a plane perpendicular to the generatrix of the folded wave type as shown by the dashed lines, and the cut planes are turned 90 degrees to become the upper or lower surface, as shown in FIG. The seedling growing block shown in is obtained.

The above-mentioned seedling-raising blocks are usually formed into a size that allows them to be closely accommodated in a seedling-raising box by gluing a plurality of them on the side surface B thereof.

E. Effect As described above, in the seedling raising block of the present invention, since the laminated surfaces of the random webs are vertical, most of the constituent fibers are oriented in the vertical direction, and the laminated random webs are bent and folded into continuous waves. Since it is folded, the laminated surface extends substantially laterally in the interior, and the corrugated top surface forms a planar random web layer on the side.

Therefore, this seedling-raising block maintains good water permeability, air permeability, compression resistance, penetration of plant roots, etc. in the thickness direction, and also has good properties such as shape retention and non-shrinkage in the lateral and frontal directions. This results in desirable performance.

F Example 25 mm thick, sprayed with approximately 2% by weight of phenolic resin using a normal multi-rotor type manufacturing machine.
After obtaining a rock wool mat with a density of 20 kg/m ³ , the mat was bent and folded into a continuous wave shape on a conveyor, compressed and assembled, and dried with hot air at 250°C to a thickness of 140 mm.
It was made into a plate-like body with a density of 64 kg/m ³ .

Cut the plate into a piece with a width of 20 mm and a thickness of 140 mm.
280 mm wide, 20 mm thick, long. It was made into a seedling raising block for box beds with a height of 580 mm.

On the other hand, as a comparative example, a normal constituent fiber random web layer was oriented and laminated parallel to the mat surface at a density of 64.
Cut the rock wool mat of Kg/m ³ to a width of 20 mm.
A block with a thickness of 140 mm and a length of 580 mm was made, the cut surface was changed to be the top surface or the bottom surface, and the two pieces were glued together in the same manner as above to obtain a seedling growing pine with the same dimensions as above.

When both of these were housed in a floor box with an inner diameter of 280 x 580 mm and thoroughly watered, the product of the present invention had almost no shrinkage, but the comparative example had a width shrinkage of 9 to 10 mm, and the gap between the floor box and the wall was A void was created.

Next, when we sowed the germinated water seedlings and covered them with soil (approximately 5 mm thick), we were able to work smoothly with the product of the present invention without any problems, but with the comparative example, it was difficult to also fell into the voids, making the sowing and covering of soil uneven.

Moreover, as a result of growing seedlings for 30 days, the seedlings using the product of the present invention had good growth with no unevenness throughout, whereas the comparative example had further non-uniform shrinkage in the width direction during handling. The seedling density was uneven, and the growth of the seedlings was uneven.

When this seedling raising box was placed on a rice transplanter and planted, it was found that in the case of using the product of the present invention, the roots of the seedlings were removed smoothly using the planting claws, and a uniform number of seedlings were planted. In the example, root removal failure occurred in some areas and the number of plants planted was uneven.

Effects of the Invention As explained above, in the mineral fiber seedling block of the present invention, all of the random web lamination surfaces are vertical, and are also arranged in the width direction and length direction of the block, so that they are aligned in the thickness direction. compression resistance,
It has properties such as water permeability, air permeability, shape retention in the plane direction, and non-shrinkage, and can provide particularly good growing conditions as a seedling block for box beds, improving workability with rice transplanters. It is possible.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention, and FIG. 2 is a perspective view of a mineral fiber plate used to obtain the product of the embodiment. A...Top surface, B...Side surface, C...Front surface.

Claims (1)

[Claims] 1 A plate-like body obtained by bending and folding a pine laminated with random webs of mineral fibers into a continuous wave shape is cut into a block at a plane perpendicular to the generating line of the wave shape, and the block is cut into blocks. 1. A mineral fiber seedling block for use in a box bed, characterized in that the laminated surface of the random web is vertical with the cut surface thereof being the upper surface or the lower surface.