JPH074112B2 - Artificial medium material for plant cultivation and method for producing the same - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for producing an artificial medium material used for cultivating plants.

(Prior Art) As an artificial medium material for plant cultivation of this kind, for example, an artificial soil composed of porous mineral particles and a composite synthetic fiber having a heat-fusible surface layer 30 to 100% by weight and a high melting point fiber 0 to 70% by weight % Of a fiber material dispersed therein, wherein the composite-type synthetic fibers are fused at mutual melting points to form a three-dimensional network structure. A culture bed for cultivation has already been developed before the application of the present invention.

(Problems to be Solved by the Invention) However, this culture bed for plant growth requires a plurality of specific materials such as a composite synthetic fiber having a heat-fusible surface layer and a high melting point fiber, and a composite fiber is used in the production thereof. Cumbersome processes such as spraying porous mineral particles between layers when carding with card machines or laminating carded fiber aggregates to form a weng, or heating these composite synthetic fibers to make mutual contact However, there are problems such as complicated devices for fusion bonding and advanced technology are required.

(Means for Solving the Problems) The present invention is to sprinkle thermoplastic synthetic resin filaments in a molten state from a required number of downward nozzles to allow the filaments to descend naturally and to form a granular material from a pipe installed at a prescribed position between the nozzles. The artificial culture soil is dropped, and the air is injected from the air injection nozzle installed at the required position between each nozzle and each pipe, and the artificial culture soil in the above-mentioned falling process and the flexibility in the molten state still in the descending process are maintained. The plant cultivation characterized in that it is sprayed onto the filaments and the artificial soil is dispersed and mixed between the filaments, and the filaments are folded and cross-welded to each other to form a three-dimensional network structure and to be cooled and solidified. It is intended to solve such a problem by providing a method for producing an artificial culture medium material.

(Example) First, a thermoplastic synthetic resin is melted, the molten resin is spun out from a downward nozzle 1 provided in a die of an extruder, a filament 2 is formed, and the filament 2 is naturally lowered. Line 2
Is set so that the wire diameter of the nozzle located outside is thin and the wire diameter of the nozzle located inside is large.

The molten resin is preferably colored with a light-shielding color in consideration of the growth of plant roots.

Further, the artificial granulated soil 4 in the form of powder is dropped from the pipe 3 arranged at a required position between the nozzles 1 at the same time when the filament 2 is naturally lowered.

The artificial soil 4 is made of vermiculite, perlite, or a porous inorganic substance such as Kanuma soil with a water-retaining agent of super absorbent polymer particles,
It is composed by mixing resin-coated fertilizer.

The artificial soil 4 is adjusted so that one having a large particle size falls from the pipe 3 located outside and one having a small particle size falls from the pipe 3 located inside.

Further, the filaments 2 in the descending process while maintaining the flexibility in the above-mentioned molten state from the air injection nozzles 5 arranged at the required positions between the nozzles 1 and the pipes 3, and the artificial soil in the descending process. 4, the required amount of air 6 given the required temperature and the required jet speed is continuously or intermittently jetted, and the artificial strips 4 are dispersed and mixed in between the linear strips 2 to bend the linear strips 2. And cross-weld each other.

The air injection nozzle 5 is mounted so as to be rotatable and reciprocally movable in the horizontal direction. Each of the filaments 2 has a large degree of fold of an outer wire having a small diameter and a small degree of fold of an inner wire having a large diameter, that is, the outer filament density is high and the inner filament density is high. To be lower
The amount of the air 6, the temperature, the ejection speed, the rotation speed of the air injection nozzle 5, the reciprocating speed, etc. are appropriately set, and the intermittent or continuous operating state of the air injection nozzle 5 is also appropriately adjusted.

By such an adjustment, the artificial soil 4 having a small particle diameter is mixed in the inner portion having a low linear density, while the artificial soil 4 having a large particle diameter is filled in the outer portion having a high linear density. The fall of the artificial soil 4 between the filaments 2 is reliably prevented.

Next, the filaments 2 continue to descend while the outer edges of the filaments 2 are aligned by the curtain of the water stream 8 falling along the guide plate 7 arranged on the outer peripheral portion, and the air blowing pipe 9 for precooling is sandwiched therebetween. The first take-up roll 10 and the second take-up roll 11 each of which the rotation speed can be adjusted are taken up.

The take-up speed of the second take-up roll 11 is usually set to be slower than that of the first take-up roll 10, so that the filaments 2 which have already been folded to some extent by the air jet nozzle 5 are folded again to the final density. Is adjusted.

That is, if the difference between the take-up speeds of the first take-up roll 10 and the second take-up roll 11 is increased, the degree of fold is increased and the density is increased.

When each filament 2 passes through the second take-up roll 11, it is completely cooled and solidified, and the three-dimensional reticulate body 12 in which the artificial void 4 is filled and held in the inner void portion, that is, the artificial medium material 13 for plant cultivation of the present invention is completed.

If the nozzles 1 are arranged linearly, a flat mat-shaped artificial medium material 13 as shown in the drawing can be formed, and if the nozzle 1 is arranged flatly, a columnar artificial medium material 13 can be formed. is there.

The artificial culture medium material 13 is used after being cut into a required shape, but if necessary, a treatment such as spraying an emulsion resin adhesive or the like on the cut surface to seal the cut surface may be performed.

(Operation and effect of the invention) The present invention causes air to be injected into the artificial soil to be dropped simultaneously with the synthetic resin filaments that melt down from the extruder to disperse and mix the artificial soils between the filaments while simultaneously folding the filaments. Since a three-dimensional network is formed by cross-welding each other, it is not necessary to use a plurality of special materials such as a composite type synthetic fiber having a heat-welding surface layer and a high melting point fiber as in the above-mentioned prior art, and a composite fiber. Carding with a card machine or laminating carded fiber aggregates to form a wing, a troublesome process such as spraying porous mineral particles between layers or heating these composite type synthetic fibers There is no need for a complicated device such as fusion at a contact point and a high level technology, and the present invention has an effect that the above problems can be sufficiently solved. It is something.

[Brief description of drawings]

The drawings are manufacturing process diagrams showing an embodiment of the present invention. 1 ... Nozzle, 2 ... Line, 3 ... Pipe, 4 ... Artificial soil, 5 ... Air injection nozzle, 6 ... Air, 7 ...
Guide plate, 8 ... water flow, 9 ... air blow-out tube, 10 ... first take-up roll, 11 ... second take-up roll, 12 ... three-dimensional mesh body, 13 ... artificial medium material.

Claims (1)

[Claims] 1. A thermoplastic synthetic resin filament in a molten state is spun from a required number of downward nozzles to be naturally lowered, and at the same time, a granular granular artificial soil is dropped from a pipe installed at a required position between the nozzles. Air is jetted from the air jet nozzle installed at the required position between the nozzle and each pipe to the artificial soil in the above falling process and the filaments that are still in the descending process and still maintain the flexibility in the molten state. A method for producing an artificial medium material for plant cultivation, characterized in that the filaments are folded and cross-welded to each other while the artificial soil is dispersed and mixed between the filaments to form a three-dimensional network structure and then cooled and solidified.