JP2011109931A - Porous sintered raising seedling bed, method for producing the raising seedling bed, and cultivation set - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a porous sintered raising seedling bed, a method for producing the porous sintered raising seedling bed, and a cultivation set using the porous sintered raising seedling bed, wherein the porous sintered raising seedling bed is light in weight, has excellent mechanical strength, is excellent in water-holding properties, has no need to water everyday, and is repeatedly usable. <P>SOLUTION: The porous sintered raising seedling bed 1 is produced by: (S13) adding 300 pts.wt. of zeolite particles each having an average particle diameter of 150 μm as mineral particles 4, 300 pts.wt. of glass particles 5 having a softened point of 700°C and having an average particle diameter of 50 μm, 100 pts.wt. of wood powder 3 having an average particle diameter of 150 μm, and 5 pts.wt. of polyol resin 6, and evenly mixing them with a precision dispersing mixer; (S14) adding 5 pts.wt. of isotianate resin 8 to the mixture and evenly mixing them; (S15) press-forming the mixture at normal temperature; and (S16) firing the formed mixture at 700-900°C. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a nursery bed applying a porous sintered body such as a block-shaped porous ceramic molded body having water absorption and water retention, a method for producing the same, and a cultivation set applying the porous sintered body nursery bed It is.

  Materials based on materials other than soil and soil have been developed as base materials for hydroponics and cultivating floors for horticulture. As such a cultivation bed, there exists a thing concerning the invention of patent documents 1 thru / or patent documents 3, for example. In the culture medium for hydroponics described in Patent Document 1, granules or fibrous culture media are filled and sealed in a water-permeable container made of fiber knitted fabric, and one or more plant cultivation openings are formed in this container. By providing it, hydroponics can be carried out easily and efficiently, it has high mechanical strength, can be easily formed into the desired shape, and can be easily disposed of after use without causing environmental problems by incineration or biodegradation A possible hydroponic culture medium is obtained.

  Moreover, in the horticultural cultivation floor described in Patent Document 2, the foamed synthetic resin particles are bonded with a bonding agent to form a plate-like body having a gap between the particles, and a plurality of recesses are formed on the upper surface of the plate-like body. And a water-retaining material is filled in a container capable of storing water, the container is loaded into the concave portion, and a culture medium is placed on the top. According to this, it is said that a horticultural cultivation floor that is excellent in productivity and heat insulation, has good drainage and water retention, is lightweight and easy to transport and construct.

  Furthermore, in the culture medium for plant cultivation described in Patent Document 3 and the production method thereof, in the culture medium mainly composed of rock wool, the culture medium is configured using granular rock wool having a low hydrophilicity to the rock wool. Therefore, it is avoided that excessive moisture is soaked into the granular rock wool, and most of the moisture contained in the medium is retained in the gap formed between the granular rock wool and the sub-material in the gap, and other excess As a result of draining the moisture out of the medium as gravity water, it is said that an excess of moisture does not stagnate in the medium, and a plant cultivation medium that is lightweight and capable of simple moisture management is obtained.

JP-A-11-2255597 JP 2002-360068 A JP 2003-284430 A

  However, these technologies described in Patent Documents 1 to 3 all have low mechanical strength, require attention in handling, and are difficult to reuse. There was a problem that it had to be processed and was also disadvantageous in terms of cost.

  Therefore, the present invention has been made to solve such a problem, is lightweight, has excellent mechanical strength, is easy to handle, has excellent water retention, and does not require watering every day. A porous sintered body nursery bed that can be used repeatedly by using treatment such as washing with hot water after use, a method for producing the same, and a porous sintered body nursery bed The purpose is to provide the cultivation set used.

The porous sintered body nursery bed according to claim 1 has an average particle diameter of 0.1 to 3 mm and a mineral particle having a softening point of less than 800 ° C. and an average particle diameter of 10 to 400 μm. and glass particles, average particle size after uniformly mixing the wood flour in the range of 50Myuemu～400myuemu, mixing these mixtures uniformly with synthetic resin binder, at normal temperature of 150kg / cm ² ~400kg / cm ² It is formed by applying pressure within the range, press molding, and sintering within a range of 700 ° C to 900 ° C.

Here, as “mineral substance particles”, silica (SiO ₂ ), alumina (Al ₂ O ₃ ), titania (TiO ₂ ), zirconia (ZiO ₂ ), silicon nitride (Si ₃ N ₄ ), silicon carbide (SiC) ), Ceramic particles such as ceramic powder and porcelain powder, and natural inorganic particles such as natural zeolite particles, diatomaceous earth powder and rock powder. In particular, ceramic powder, zeolite particles and the like are more preferable because of low cost. Moreover, as “glass having a softening point of less than 800 ° C.”, silicate glass, low-melting glass, or the like can be used.

  Further, the average particle diameter is a value measured by a laser diffraction particle size distribution measuring device Microtrac. In addition, as a method of obtaining “wood powder having an average particle diameter of 50 μm to 400 μm”, for example, after sawdust such as large sawdust and thinned wood chips is dried to a moisture of 20% by weight or less, a pulverizer There is a method of finely pulverizing. By drying the wood chips to a water content of 20% by weight or less, when these are finely pulverized, a large amount of water is released to form a slurry and prevent fine pulverization.

  In addition, “synthetic resin binders” include thermoplastic resins such as polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride, polystyrene, polyvinyl acetate, acrylic resins, phenol resins, epoxy resins, polyol resins, isocyanate resins, melamines. Thermosetting resins such as resins, urea resins, unsaturated polyester resins, and alkyd resins can be used, and two or more of these resins can be mixed and used.

  A porous sintered body nursery bed according to claim 2 is the wood powder according to the structure of claim 1, wherein the glass particles are within a range of 200 to 400 parts by weight with respect to 300 parts by weight of the mineral particles. In the range of 100 to 300 parts by weight, and the synthetic resin binder is mixed in the range of 10 to 40 parts by weight.

  The porous sintered body nursery bed according to claim 3 is the constitution of claim 1 or claim 2, wherein the synthetic resin binder is an isocyanate resin, or a polyol resin and an isocyanate resin.

  The porous sintered body nursery bed according to claim 4 is the structure according to any one of claims 1 to 3, and means for uniformly mixing the mineral substance particles, the glass particles, and the wood powder, and these As a means for uniformly mixing the mixture with the synthetic resin binder, a precision dispersion mixer is used. Here, as the “precise dispersion mixer”, a high-speed stirring dispersion machine having a peripheral speed in the range of 20 m / second to 30 m / second can be used. As such a high-speed stirring disperser, for example, there is a horizontal turbulizer (registered trademark) manufactured by Hosokawa Micron Corporation.

The method for producing a porous sintered body nursery bed according to claim 5 has an average particle diameter of 10 μm to 400 μm and a mineral particle having an average particle diameter of 0.1 mm to 3 mm and a softening point of less than 800 ° C. Sintering raw material mixing step of uniformly mixing glass particles within a range and wood powder having an average particle diameter of 50 μm to 400 μm to form a sintering raw material mixture; and said sintering raw material mixture as a synthetic resin binder a binder mixing step of the binder mixture is uniformly mixed and press-molded by applying a pressure in the range of 150kg / cm ² ~400kg / cm ² at room temperature filled with the binder mixture into the press mold, press molding A press molding step for forming a body, and a firing step for firing the press molded body within a range of 700 ° C to 900 ° C.

  The method for producing a porous sintered body nursery bed according to claim 6 is the structure of claim 5, wherein the glass particles are within a range of 200 to 400 parts by weight with respect to 300 parts by weight of the mineral particles. The wood powder is mixed in the range of 100 to 300 parts by weight, and the synthetic resin binder is mixed in the range of 10 to 40 parts by weight.

  The method for producing a porous sintered body nursery bed according to claim 7 is the structure of claim 5 or claim 6, wherein the synthetic resin binder is an isocyanate resin, or a polyol resin and an isocyanate resin.

  The method for producing a porous sintered body nursery bed according to claim 8 is the structure according to any one of claims 5 to 7, wherein a precision dispersion mixer is used in the sintering raw material mixing step and the binder mixing step. Used to mix. Here, as the “precise dispersion mixer”, a high-speed stirring dispersion machine having a peripheral speed in the range of 20 m / second to 30 m / second can be used. As such a high-speed stirring disperser, for example, there is a horizontal turbulizer (registered trademark) manufactured by Hosokawa Micron Corporation.

  The cultivation set which concerns on Claim 9 is the porous manufactured by the manufacturing method of the porous sintered compact nursery bed which concerns on Claims 1 thru | or 4, or the porous sintered compact nursery bed which concerns on Claim 5 thru | or 8. A cultivation set using a sintered nursery bed, a support tray on which the porous sintered nursery bed is floated from the bottom, a light-shielding cylindrical cover placed on the support tray, and the cylinder And a cover member having a plurality of ventilation holes placed on the cover. The support tray and the cylindrical cover are opaque, and the cover member is translucent.

The porous sintered body nursery bed according to claim 1 has an average particle diameter of 0.1 to 3 mm and a mineral particle having a softening point of less than 800 ° C. and an average particle diameter of 10 to 400 μm. and glass particles, average particle size after uniformly mixing the wood flour in the range of 50Myuemu～400myuemu, mixing these mixtures uniformly with synthetic resin binder, at normal temperature of 150kg / cm ² ~400kg / cm ² It is press-molded by applying a pressure within the range and sintered within a range of 700 ° C to 900 ° C.

Thus, by using the wood powder having an average particle diameter of 50 μm to 400 μm, the wood powder becomes whisker-like and is mixed uniformly with the synthetic resin binder. Fillability of glass particles is greatly improved. By press-molding under pressure within this range at room temperature of ^{150kg / cm 2 ~400kg / cm 2} , a strong and dense molded body is obtained. In the firing stage, the wood powder and the synthetic resin binder are burned out when heated to around 400 ° C., and the entire molded body becomes uniform porous, and then the glass particles melt and soften at the softening point of the glass particles. Then, the mineral particles are brought into close contact with each other.

  The sintered body produced in this way becomes porous with fine through-holes in communication, has air permeability, absorbs water when water is poured and retains the entire sintered body, and exceeds the amount of water retained when water is further poured. Moisture is removed from the sintered body and drops. Furthermore, since the surface becomes rough according to the particle shape of the mineral particles, the roots of the plants are easily entangled, and the roots can be stretched in the large voids, so that the growth of the plants is not hindered. Moreover, when press-molding, by using a mold in which unevenness of 1 mm to 5 mm is formed on one side, it is possible to form a surface on which the roots of plants can be easily entangled and rooted.

  Furthermore, since it is porous, it is lightweight, and since the molten glass functions as a binder, it has excellent mechanical strength and is extremely easy to handle. And since it consists only of a mineral substance and glass, it is strong also to a heating, and after use, it can be used repeatedly many times by performing hot water disinfection, boiling disinfection, and flame disinfection.

  In this way, it is lightweight, has excellent mechanical strength, is easy to handle, has excellent water retention, does not require watering every day, can promote plant growth, and is heated after use. By performing a treatment such as washing with water, a porous sintered body nursery bed that can be used repeatedly is obtained.

  In the porous sintered body nursery bed according to claim 2, the glass particles are in the range of 200 to 400 parts by weight and the wood powder is in the range of 100 to 300 parts by weight with respect to 300 parts by weight of the mineral particles. In addition, since the synthetic resin binder is mixed within the range of 10 to 40 parts by weight, in addition to the effect of the invention according to claim 1, penetration of the sintered body obtained by firing the formed body The size and distribution of the holes become more appropriate, and a sintered body having a higher strength can be obtained.

  In the porous sintered body nursery bed according to claim 3, since the synthetic resin binder is an isocyanate resin, or a polyol resin and an isocyanate resin, in addition to the effects of the invention according to claim 1 or 2, the isocyanate resin By forming a strong urethane bond with wood powder, press molding can provide a more secure and dense product. Then, by firing this dense formed body, the wood powder and the synthetic resin binder are burned out, and a uniform porous sintered body can be obtained.

  In the porous sintered body nursery bed according to claim 4, as a means for uniformly mixing mineral particles, glass particles and wood flour, and a means for uniformly mixing these mixtures with a synthetic resin binder, a precision dispersion mixer Therefore, in addition to the effects of the inventions according to claims 1 to 3, these raw materials are mixed more reliably and uniformly, so that a dense and high-strength sintered body can be obtained more reliably. it can.

In the method for producing a porous sintered body nursery bed according to claim 5, first, in the sintering raw material mixing step, mineral particles, glass particles, and wood powder are uniformly mixed to form a sintering raw material mixture, and then binder mixing In the process, the sintered raw material mixture is uniformly mixed with the synthetic resin binder to form a binder mixture. The binder mixture, in the press molding process, is filled into the press mold, is pressed at a pressure in the range of 150kg / cm ² ~400kg / cm ² at room temperature, this firm and dense molded body by is obtained . Then, in the firing step, by firing this dense product, the wood powder and the synthetic resin binder are burned out, and a uniform porous sintered body can be obtained.

  The sintered body produced in this way becomes porous with fine through-holes in communication, has air permeability, absorbs water when water is poured and retains the entire sintered body, and exceeds the amount of water retained when water is further poured. Moisture is removed from the sintered body and drops. Furthermore, since the surface becomes rough according to the particle shape of the mineral particles, the roots of the plants are easily entangled, and the roots can be stretched in the large voids, so that the growth of the plants is not hindered. Also, in the press molding process, by using a press mold in which irregularities of 1 mm to 5 mm and grooves with a depth of 1 mm to 5 mm are formed on one side, the roots of plants can be more easily entangled and the roots can be stretched. Can be formed.

  Furthermore, since it is porous, it is lightweight, and since the molten glass functions as a binder, it has excellent mechanical strength and is extremely easy to handle. And since it consists only of a mineral substance and glass, it is strong also to a heating, and after use, it can be used repeatedly many times by performing hot water disinfection, boiling disinfection, and flame disinfection.

  In this way, it is lightweight, has excellent mechanical strength, is easy to handle, has excellent water retention, does not require watering every day, can promote plant growth, and is heated after use. It becomes the manufacturing method of the porous sintered compact nursery bed which can be repeatedly used by processing, such as washing with water.

  The method for producing a porous sintered body nursery bed according to claim 6 is based on 300 parts by weight of mineral particles, 200 parts by weight to 400 parts by weight of glass particles, and 100 parts by weight to 300 parts by weight of wood flour. In addition to the effects of the invention according to claim 5, in addition to the effects of the invention according to claim 5, the sintered product obtained by firing the formed body is because the synthetic resin binder is mixed within the range of 10 parts by weight to 40 parts by weight. The size and distribution of the through-holes of the body become more appropriate, and a sintered body with better strength can be obtained.

  In the porous sintered body nursery bed according to claim 7, since the synthetic resin binder is an isocyanate resin, or a polyol resin and an isocyanate resin, in addition to the effect of the invention according to claim 5 or 6, the isocyanate resin By forming a strong urethane bond with wood powder, press molding can provide a more secure and dense product. Then, by firing this dense formed body, the wood powder and the synthetic resin binder are burned out, and a uniform porous sintered body can be obtained.

  In the method for producing a porous sintered body nursery bed according to claim 8, since mixing is performed using a precision dispersion mixer in the sintering raw material mixing step and the binder mixing step, the invention according to claims 5 to 7 is provided. In addition to the effect, these raw materials are more reliably and uniformly mixed, so that a dense and high-strength sintered body can be obtained more reliably.

  The cultivation set which concerns on Claim 9 is the porous manufactured by the manufacturing method of the porous sintered compact nursery bed which concerns on Claims 1 thru | or 4, or the porous sintered compact nursery bed which concerns on Claim 5 thru | or 8. A cultivation set using a sintered nursery bed, a support tray that supports the porous sintered nursery bed in a floating state from the bottom, a light-shielding cylindrical cover that covers the support tray, and a cylindrical cover A cover member having a plurality of ventilation holes placed on the support tray, the support tray and the cylindrical cover are opaque, and the cover member is translucent.

  As a usage method of a cultivation set, first, water containing liquid fertilizer is put into a support tray, and a porous sintered body nursery bed is placed on the support tray. At this time, the amount of water containing liquid fertilizer is adjusted so as to be immersed to about half the thickness of the porous sintered body nursery bed. Subsequently, seeds of a plant to be nurtured are sown on a porous sintered body nurturing bed, covered with paper wetted with water, covered with a cylindrical cover, and covered with a lid. By placing the cultivation set thus assembled in an environment that is equal to or higher than the germination temperature of seeds, germination and growth occur in 1 to 2 days. If necessary, remove the lid and the cylindrical cover when it grows to the required height, and light it to make it green.

  As described above, the porous sintered body nursery bed according to the present invention has a porous structure in which fine through holes communicate with each other, has air permeability, absorbs water when water is poured, and retains the entire sintered body. When water is poured, water exceeding the water retention amount is removed from the sintered body and dripped. Because it has such a moisture control function, once it is set as described above, it is not necessary to add water for one to two weeks, and even an amateur can easily cultivate plants at home. Can do. Particularly, it is suitable for cultivation of sprout vegetables such as kaiware radishes and buckwheat noodles because it grows in a shaded state with an opaque cylindrical cover, a support tray and a translucent lid.

  In this way, by applying the moisture control function of the porous sintered body breeding seedling bed, it is possible to save the labor of watering, and it becomes a cultivation set that can be easily cultivated in the home even by a completely amateur.

FIG. 1 is a flowchart showing a method for manufacturing a porous sintered body nursery bed according to Example 1 of the present invention. FIG. 2 is a perspective view (photograph) of a porous sintered body nursery bed manufactured by the method for manufacturing a porous sintered nursery bed according to Example 1 of the present invention. FIG. 3 is a perspective view showing the configuration of a cultivation set to which the porous sintered body nursery bed according to Example 1 of the present invention is applied. Fig.4 (a) is a longitudinal cross-sectional view which shows the structure of the cultivation set which concerns on Example 1 of this invention, (b) is a partial expanded sectional view. FIG. 5 is a perspective view (photograph) showing a plant cultivated in the cultivation set according to Example 1 of the present invention together with a porous sintered body breeding seedling bed. FIG. 6 is a perspective view (photograph) of a porous sintered body nursery bed manufactured by the method for manufacturing a porous sintered nursery bed according to Example 2 of the present invention. FIG. 7: is a perspective view (photograph) which shows the plant grown with the cultivation set which concerns on Example 2 of this invention with a porous sintered compact breeding seedbed. FIG. 8A is a perspective view of a porous sintered body nursery bed manufactured by the method for manufacturing a porous sintered nursery bed according to Example 3 of the present invention, and FIG. 8B is a cross-sectional view taken along line AA in FIG. is there.

  In practicing the present invention, wood powder having an average particle size in the range of 50 μm to 400 μm is required. Here, the average particle diameter of the wood flour is a value measured by a laser diffraction particle size distribution measuring device Microtrac. The economical way to obtain wood flour with an average particle size of 50 μm to 400 μm is to dry wood chips such as thinned wood, small-diameter wood, bark, sawn timber, and large sawdust to 20% by weight or less. After that, it is preferable to pulverize. By drying the wood chips to a moisture content of 20% by weight or less, it is possible to prevent the pulverized product from becoming a slurry and preventing fine pulverization.

  In order to finely pulverize the dried wood chips into a wood powder having an average particle diameter of 50 μm to 400 μm, it is preferable to use a fine pulverizer having a peripheral speed of 50 m / second to 80 m / second. As such a fine pulverizer, there is a micron colloid mill manufactured by Kawamoto Tekko Co., Ltd., for example. Further, with respect to such wood flour, glass particles having a softening point of less than 800 ° C. and glass particles in the range of 10 μm to 400 μm and mineral particles in the range of average particle diameter of 0.1 mm to 3 mm are uniformly distributed. In order to mix, it is preferable to use a high-speed stirring disperser within a range of a peripheral speed of 20 m / sec to 30 m / sec. As such a high-speed stirring disperser, for example, there is a horizontal turbulizer (registered trademark) manufactured by Hosokawa Micron Corporation.

  In order to uniformly mix the synthetic resin binder with the mixture of wood powder, glass particles, and mineral particles thus mixed, the peripheral speed is also within the range of 20 m / sec to 30 m / sec. It is preferable to use a high-speed stirring disperser. As the synthetic resin binder, a polyol resin and an isocyanate resin are particularly preferable. When the mixture of wood powder, glass particles, and mineral particles has a certain amount or more of moisture, sufficient bonding can be achieved even by using only the isocyanate resin. You can gain power.

  When a polyol resin and an isocyanate resin are used as a synthetic resin binder, if they are mixed, a reaction occurs immediately depending on the temperature and a urethane bond starts to form. However, only the polyol resin is mixed with wood powder, glass particles, and mineral particles. Since the reaction does not occur even if they are mixed together, the polyol resin can also be mixed in addition to the mineral particles, the glass particles and the wood powder in the sintering raw material mixing step. And just before implementing a press process, what is necessary is just to add and mix an isocyanate resin as a binder mixing process.

  Specific examples of the polyol resin include polyoxyethylene glycerether, polyoxypropylene glycerether, polyoxybutylene glycerether, and the like. Furthermore, as the isocyanate resin, specifically, polyethylene polyphenyl polyisocyanate or the like can be used.

  When carrying out the cultivation set according to the present invention, it is more preferable from the viewpoint of cost and lightness to use a support tray, a cylindrical cover, and a lid material produced by injection molding a synthetic resin (plastic). . Here, as the synthetic resin, thermoplastic resins such as polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride, polystyrene, polyvinyl acetate, acrylic resin, phenol resin, epoxy resin, polyol resin, isocyanate resin, melamine resin, Thermosetting resins such as urea resin, unsaturated polyester resin, and alkyd resin can be used.

  Examples of the present invention will be described below, but the present invention is not limited to these examples.

[Example 1]
First, a porous sintered body nursery bed and a manufacturing method thereof according to Example 1 of the present invention will be described with reference to FIGS. 1 to 5. FIG. 1 is a flowchart showing a method for manufacturing a porous sintered body nursery bed according to Example 1 of the present invention. FIG. 2 is a perspective view (photograph) of a porous sintered body nursery bed manufactured by the method for manufacturing a porous sintered nursery bed according to Example 1 of the present invention. FIG. 3 is a perspective view showing the configuration of a cultivation set to which the porous sintered body nursery bed according to Example 1 of the present invention is applied. Fig.4 (a) is a longitudinal cross-sectional view which shows the structure of the cultivation set which concerns on Example 1 of this invention, (b) is a partial expanded sectional view. FIG. 5 is a perspective view (photograph) showing a plant cultivated in the cultivation set according to Example 1 of the present invention together with a porous sintered body breeding seedling bed.

  Initially, the manufacturing method of the porous sintered compact breeding seedbed which concerns on the present Example 1 is demonstrated with reference to the flowchart of FIG. As shown in FIG. 1, first, wood chips 2 such as thinned wood, small-diameter wood, lumber mill ends, bark, and large sawdust such as cedar were coarsely pulverized by a crusher (wood crusher) (step S10). Subsequently, this coarsely pulverized wood powder was hot-air dried to a water content of 20% by weight or less with a hot air dryer (step S11), and finely pulverized with a fine pulverizer (step S12) to obtain wood powder 3.

  Here, as a fine pulverizer, a micron colloid mill manufactured by Kawamoto Tekko Co., Ltd. was used, and the pulverization turbine blades were pulverized at a peripheral speed of 50 m / second to 80 m / second. When the average particle diameter of the obtained wood powder 3 was measured with a laser diffraction particle size distribution measuring device Microtrac manufactured by Nikkiso Co., Ltd., the average particle diameter was 150 μm.

  Next, with respect to 300 parts by weight of the zeolite particles having an average particle diameter of 0.15 mm as the mineral particles 4, 300 parts by weight of the glass particles 5 having a softening point of 700 ° C. and an average particle diameter of 50 μm, Sintering raw material mixing in which 3 parts by weight of wood flour 3 and 5 parts by weight of polyol resin 6 are added and mixed uniformly with a precision dispersion mixer (horizontal turbulizer (registered trademark) TCX-14 manufactured by Hosokawa Micron Corporation) The process was implemented (step S13).

  Here, as the zeolite particles 4, sun zeolite was used. Further, as glass particles 5 having a softening point of 700 ° C., glass cullet powder was used. As the polyol resin 6, “SANNICS (registered trademark) GP-400” manufactured by Sanyo Chemical Industries, Ltd., which is polyoxypropylene glycerether, was used. Since the sintered raw material mixture 7 thus manufactured can withstand long-term storage at room temperature, it is efficient and economical to perform the next binder mixing step using only the necessary amount each time it is pressed. The porous sintered body nursery bed 1 can be manufactured.

  Subsequently, a binder mixing step is performed (step S14). That is, 5 parts by weight of the isocyanate resin 8 is added to 100 parts by weight of the wood powder 3 in the sintered raw material mixture 7, and the capacity is the same as that of the mixer (TCX-8) ("TCX-14"). Were mixed uniformly to produce a binder mixture 9. Here, as the isocyanate resin 8, “Lupranate (registered trademark) M-20S” manufactured by BASE INOAC Polyurethane Co., Ltd., which is a polyethylene polyphenyl polyisocyanate, was used.

In the press molding process, the binder mixture 9 is filled in a mold of a press molding machine and press-molded by applying a pressure of 200 kg / cm ^{2 at} room temperature to obtain a generated shape 10 (step S15). In Example 1, a plate-shaped molded body that becomes the porous sintered body breeding nursery bed 1 as shown in FIG. 2 was molded as the generated molded body 10, but it is a room temperature press and does not require uniform heating from the outside. Therefore, it is possible to form a formed product having a thickness of up to 50 mm ^t as a thick product.

  In addition, by providing fine holes on the upper and lower mold cavity surfaces and providing a device that can be sucked with a vacuum pump through a filter, the mold can be used when filling the mold with a binder mixture or press molding. Since excess air and generated gas can be removed, a formed shape having more stable density and strength can be formed, which is more preferable.

  After the generated shaped body 10 thus obtained is released from the mold, it is fired at a firing temperature of 800 ° C. in the firing step (step S16). More specifically, the temperature is first increased from room temperature to 400 ° C. at 30 ° C./hour and held at 400 ° C. for 3 hours, and then heated from 400 ° C. to 600 ° C. at 50 ° C./hour to 600 ° C. At 600 ° C. to 800 ° C. at a rate of 50 ° C./hour, kept at 800 ° C. for 3 hours, and then gradually cooled to 100 ° C. for about 5 hours and taken out. Thus, it is possible to obtain a porous sintered body nursery bed 1 that is lightweight but has excellent mechanical strength, is easy to handle, and can be used repeatedly by being treated with hot water after use. Can do.

  A photograph of the porous sintered body nursery bed 1 according to Example 1 manufactured in this way is shown in FIG. As shown in FIG. 2, in the method for producing the porous sintered body nursery bed 1 according to Example 1, zeolite particles having an average particle size of 0.15 mm are used as the mineral particles 4. Since the unevenness of the surface of the body is small and relatively smooth, a plurality of grooves having a depth of 3 mm are formed in parallel. Therefore, in step S15 of FIG. 1, a press die having a cavity shape capable of forming a plurality of such 3 mm deep grooves in parallel is used.

  Next, a cultivation set to which the porous sintered body nursery bed 1 according to Example 1 manufactured in this way is applied will be described with reference to FIGS. 3 to 5. As shown in FIG. 3, in the cultivation set 11 according to the first embodiment, the support tray 12 that supports the porous sintered body nursery bed 1 in a state of floating from the bottom, and the light shielding that covers the support tray 12. A cylindrical cover 13 and a lid member 14 having a plurality of ventilation holes placed on the cylindrical cover 13, the support tray 12 and the cylindrical cover 13 are opaque, and the lid member 14 is translucent. It is. The support tray 12 and the cylindrical cover 13 are made of polyvinyl chloride resin, and the lid member 14 is made of a translucent acrylic resin.

  As a method of using the cultivation set 11, first, water containing liquid fertilizer is put into the support tray 12, and the porous sintered body nursery bed 1 is placed on the support tray 12. At this time, the amount of water containing liquid fertilizer is adjusted so as to be immersed to about half the thickness of the porous sintered body nursery bed 1. Subsequently, seeds of radish radish are sowed on the porous sintered body breeding seedling bed 1, and a sheet of newspaper wet with water is hung thereon, covered with a cylindrical cover 13 and covered with a lid member 14. 4A and 4B show longitudinal sections of the cultivation set 11 assembled in this way. By placing the cultivation set 11 in an environment that is equal to or higher than the germination temperature of the seeds of radish radish, it germinates and grows in 1 to 2 days.

  As described above, the porous sintered body nursery bed 1 becomes porous with fine through holes communicating with each other, has air permeability, absorbs water when water is poured, retains the entire sintered body, and further pours water. Moisture exceeding the water retention amount is removed from the sintered body and dripped. Since it has such a moisture control function, once it is set as described above, it is not necessary to add water for one to two weeks, and even a completely amateur can easily cultivate radish radish at home. be able to.

  The photograph of the radish sprouts cultivated using the cultivation set 11 which concerns on the present Example 1 is shown in FIG. As shown in FIG. 5, radish radish grows on the surface of the porous sintered body breeding seed bed 1. In this Example 1, the tube cover 13 and the lid 14 are removed and light is applied 5 days after germination (stem length 6 cm), but when it is desired to grow to a longer stem length, it is about 10 cm. You can keep shading until you grow up. After harvesting the Japanese radish, if the porous sintered body nursery bed 1 is placed in boiling water and boiled, washed and disinfected, the cultivation set 11 can be assembled again to grow plants such as the Japanese radish.

  Thus, in the porous sintered body nursery bed 1 according to Example 1 and the method for producing the same, it is lightweight and has excellent mechanical strength, is easy to handle, has excellent water retention, and is watered daily. Therefore, it is possible to promote the growth of the plant, and after use, the porous sintered body nursery bed that can be used repeatedly by performing a treatment such as washing with hot water and a method for producing the same.

  Moreover, in the cultivation set 11 which concerns on the present Example 1, by applying the water regulation function of the porous sintered body nursery bed 1, the trouble of watering can be saved, and even a completely amateur can easily cultivate a plant at home. can do.

[Example 2]
Next, a porous sintered body nursery bed and a method for producing the same according to Example 2 of the present invention will be described with reference to FIGS. 6 and 7. FIG. 6 is a perspective view (photograph) of a porous sintered body nursery bed manufactured by the method for manufacturing a porous sintered nursery bed according to Example 2 of the present invention. FIG. 7: is a perspective view (photograph) which shows the plant grown with the cultivation set which concerns on Example 2 of this invention with a porous sintered compact breeding seedbed.

  First, a method for producing a porous sintered body nursery bed according to Example 2 will be described with reference to FIG. The method for producing a porous sintered body nursery bed according to Example 2 is substantially the same as the method for producing the porous sintered nursery bed according to Example 1 shown in FIG. The difference is that ceramic ground particles are used as the mineral particles 4 instead of zeolite particles. These ceramic pulverized particles are finely pulverized ceramic pieces such as tea bowls and dishes. The average particle diameter was measured with a laser diffraction particle size distribution measuring device Microtrac manufactured by Nikkiso Co., Ltd. Was 0.8 mm. However, particles having a particle diameter of 2 mm to 3 mm were also mixed as coarse particles.

  With respect to 300 parts by weight of the ceramic ground particles 4 as the mineral particles 4, 100 parts by weight of the wood powder 3, 300 parts by weight of the glass particles 5 having a softening point of 700 ° C. and an average particle diameter of 50 μm, and the polyol resin 6 7 parts by weight was added and uniformly mixed with a mixer (TCX-14) to produce a sintered raw material mixture 7. Here, “Sanix (registered trademark) GP-400” manufactured by Sanyo Chemical Industries, Ltd., which is polyoxypropylene glycerether, was used as the polyol resin 6.

  Subsequently, a binder mixing step is performed (step S14). That is, 7 parts by weight of the isocyanate resin 8 was added to 100 parts by weight of the wood flour in the sintered raw material mixture 7, and the mixture was uniformly mixed with a mixer (TCX-8) to produce a binder mixture 9. Here, as the isocyanate resin 8, “Lupranate (registered trademark) M-20S” manufactured by BASE INOAC Polyurethane Co., Ltd., which is a polyethylene polyphenyl polyisocyanate, was used.

Next, a press molding process is performed. That is, the binder mixture 9 was filled in a mold of a press molding machine, and press molded at a room temperature at a pressure of 250 kg / cm ² for 1 minute to produce a formed body 10 (step S15). After releasing the generated shaped body 10 thus obtained from the mold, in the firing step, firing is performed according to the same temperature raising / lowering program as in Example 1 above, and the porous sintered body nursery bed according to Example 2 is obtained. 16 was obtained (step S16).

  As shown in FIG. 6, the porous sintered body nursery bed 16 according to Example 2 manufactured in this way has coarse ceramic pulverized particles 4 distributed over the entire surface, and the surface has many irregularities. It has become a union. Therefore, even if the groove 1a is not formed as in the porous sintered body nursery bed 1 according to the first embodiment, seeds can be planted on the entire surface, and the root becomes easy to get entangled.

  Such a porous sintered body nursery bed 16 according to the present Example 2 is used in place of the porous sintered body nursery bed 1 and cultivated as shown in FIGS. 3 and 4 in the same manner as in Example 1 above. Set 11 was made and cultivated sunny lettuce instead of radish. As a result, as shown in FIG. 7, the sunny lettuce P2 could be grown on the entire surface of the porous sintered body nursery bed 15 according to Example 2.

  Thus, in the porous sintered body nursery bed 16 and its manufacturing method according to the present Example 2, it is lightweight, has excellent mechanical strength, is easy to handle, has excellent water retention, and is watered daily. Therefore, it is possible to promote the growth of the plant, and after use, the porous sintered body nursery bed that can be used repeatedly by performing a treatment such as washing with hot water and a method for producing the same.

  Moreover, in the cultivation set which concerns on the present Example 2, the water adjustment function of the porous sintered body breeding seedling bed 16 is applied, and the effort of watering is saved, and even a completely amateur can easily cultivate a plant at home. be able to.

[Example 3]
Next, a porous sintered body breeding seedbed according to Example 3 of the present invention and a method for producing the same will be described with reference to FIG. FIG. 8A is a perspective view of a porous sintered body nursery bed produced by the method for producing a porous sintered nursery bed according to Example 3 of the present invention, and FIG. 8B is a tray for supporting the porous sintered nursery bed. It is a fragmentary sectional view which shows the state mounted in.

  As shown in FIG. 8A, the porous sintered body nursery bed 20 according to the third embodiment is manufactured by the same manufacturing method as the porous sintered body nursery bed 16 according to the second embodiment. is there. However, as shown in FIG. 8A, the size, thickness, and shape are different from the porous sintered body nursery bed 16, and therefore the cavity shape of the press mold used in the press molding process is different. . Specifically, the thickness t of the porous sintered body nursery bed 20 is 20 mm, and the surface of the porous sintered body nursery bed 16 has cultivation holes 21 with a pitch P = 30 mm, a hole diameter of 15 mm, and a depth of 15 mm. 49 are provided. The size of the porous sintered body nursery bed 20 is 230 mm × 230 mm.

  As shown in FIG. 8 (b), the cultivation hole 21 provided in the porous sintered body breeding seedbed 20 has a substantially cylindrical shape. Is placed on the support tray 22, and the support tray 22 is filled with an appropriate amount of water 23 containing liquid fertilizer, so that the water absorption and water retention of the porous sintered body nursery bed 20 function, and the plant P3 germinates and grows. Thus, in the porous sintered body breeding seedbed 20 according to the third embodiment, by providing the substantially cylindrical cultivation hole 21, the germination and breeding of vegetables and flowers are possible, and the plant P3 has a certain size. Once grown, it can be easily transplanted to the main cultivation floor.

  Thus, in the porous sintered body nursery bed 10 and its manufacturing method according to Example 3, it is lightweight and has excellent mechanical strength, is easy to handle, has excellent water retention, and is watered daily. Therefore, it is possible to promote the growth of the plant, and after use, the porous sintered body nursery bed that can be used repeatedly by performing a treatment such as washing with hot water and a method for producing the same.

  Production of porous sintered body nursery beds and the structure, shape, quantity, material, size (width / length / thickness, etc.), production method, etc. of the porous sintered body nursery beds and other parts of the cultivation set Other steps of the method are not limited to the above examples. Note that the numerical values given in the examples of the present invention are not all critical values, and certain numerical values indicate preferred values suitable for implementation. It does not deny implementation.

1,16,20 Porous sintered body nursery bed 2 Thinned wood, small-diameter wood, sawn timber, bark, large sawdust 3 Wood flour 4 Mineral particles 5 Glass particles 6 Polyol resin 7 Sintering raw material mixture 8 Isocyanate resin 9 Binder mixture 10 Generation form 11 Cultivation set 12 Support tray 13 Cylindrical cover 14 Lid

Claims (9)

Mineral substance particles having an average particle size in the range of 0.1 mm to 3 mm, glass particles having a softening point of less than 800 ° C. in the range of 10 μm to 400 μm, and an average particle size in the range of 50 μm to 400 μm after homogeneously mixing the wood flour inner, mixing these mixtures uniformly with synthetic resin binder, press-molded by applying a pressure in the range of 150kg / cm ² ~400kg / cm ² at room temperature, 700 ° C. A porous sintered body nursery bed which is sintered within a range of ˜900 ° C.   With respect to 300 parts by weight of the mineral particles, the glass particles are within a range of 200 parts by weight to 400 parts by weight, the wood flour is within a range of 100 parts by weight to 300 parts by weight, and the synthetic resin binder is 10 parts by weight. It mixes within the range of 40 parts by weight to 40 parts by weight, The porous sintered body nursery bed according to claim 1.   The porous sintered body nursery bed according to claim 1 or 2, wherein the synthetic resin binder is an isocyanate resin, or a polyol resin and an isocyanate resin.   2. A precision dispersion mixer is used as means for uniformly mixing the mineral substance particles, the glass particles and the wood powder, and means for uniformly mixing the mixture with a synthetic resin binder. The porous sintered body breeding nursery bed according to any one of claims 3 to 4. Mineral substance particles having an average particle size in the range of 0.1 mm to 3 mm, glass particles having a softening point of less than 800 ° C. in the range of 10 μm to 400 μm, and an average particle size in the range of 50 μm to 400 μm A sintering raw material mixing step for uniformly mixing the wood flour in the inside to obtain a sintering raw material mixture;
A binder mixing step in which the sintered raw material mixture is uniformly mixed with a synthetic resin binder to form a binder mixture;
Press-molded by applying a pressure in the range of 150kg / cm ² ~400kg / cm ² at room temperature filled with the binder mixture in the press die, a press molding step of a press-molded body,
A sintering step of sintering the press-molded body within a range of 700 ° C to 900 ° C;
The manufacturing method of the porous sintered compact nursery bed characterized by comprising.   With respect to 300 parts by weight of the mineral particles, the glass particles are within a range of 200 parts by weight to 400 parts by weight, the wood flour is within a range of 100 parts by weight to 300 parts by weight, and the synthetic resin binder is 10 parts by weight. It mixes within the range of 40 parts by weight to 40 parts by weight, The method for producing a porous sintered body nursery bed according to claim 5.   The method for producing a porous sintered body nursery bed according to claim 5 or 6, wherein the synthetic resin binder is an isocyanate resin, or a polyol resin and an isocyanate resin.   In the said sintering raw material mixing process and the said binder mixing process, it mixes using a precision dispersion | distribution mixer, The porous sintered compact nursery bed of any one of Claim 5 thru | or 7 characterized by the above-mentioned. Production method. Cultivation set using the porous sintered body nursery bed manufactured by the porous sintered body nursery bed according to claims 1 to 4 or the porous sintered body nursery bed according to claims 5 to 8 Because
A support tray on which the porous sintered body nursery bed is floated from a bottom surface; a light-shielding cylindrical cover that covers the support tray; and a plurality of vent holes that cover the cylindrical cover. The cultivation set characterized by comprising a cover material, the said support tray and the said cylindrical cover are opaque, and the said cover material is translucent.