JPH02100620A - Pot for transplanting - Google Patents

Abstract

PURPOSE:To obtain an agricultural and horticultural pot for transplanting composed of a film prepared by laminating polyvinyl alcohol-based thin films having short and thin cracks and mutually bonding the thin films and having breathability, water permeability, water retention characteristics and durability. CONSTITUTION:For example, one or more kinds of polyvinyl alcohol with >=1400 average polymerization degree and >=98.5% saponification degree are blended with a plasticizer (e.g., glycerin) as necessary, dispersed into water or dissolved into water and then formed into a film. The resultant polyvinyl alcohol-based film 10 is subjected to slitting, stretching and heat treatment to be formed into a thin film having cracks (A) of a short and thin shape and the obtained thin films are laminated and bonded to prepare a laminated film. The objective pot is composed of the above-mentioned laminated film and can improve growth rate of seedlings without soil-overflow or root projection in potting.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a pot used for transplanting in seedling management of fruits, vegetables, flowers, etc.

(Conventional techniques and their problems) Transplanting fruits, vegetables, flowers, etc. requires the most labor in raising and managing seedlings, and has a large impact on subsequent growth.

Transplanting is performed with the purpose of providing better seedling-raising conditions according to the growth of the seedlings, and the expected effect is [F
] As the seedlings grow, they will be densely planted and will be prevented from becoming soft and elongated ■ Promote root development and reduce the amount of soiling during planting ■ In the hot bed for planting, the bed temperature will drop during seedling raising, so move it to a new hot bed. On the contrary, it prevents a drop in temperature.■ It is possible to weed out defective seedlings and obtain good seedlings.

However, in recent years, it has become common practice to transfer seedlings to pots during transplantation, which is a so-called hoisting operation. Kechiage has the advantage of requiring less planting, which reduces labor and makes seedling management easier. The necessary functions of the transplant pot used in this case are air permeability, water permeability, and water retention, and clay pots have traditionally been used. However, although clay pots are porous and breathable and allow for good root growth, they have the drawbacks of being easily damaged and expensive.

Alternatives include plastic pots and peat moss pots, but plastic pots are not breathable and can cause rooting if overwatered. In addition, beet pots have a strong water absorption and water retention capacity and are humid, which causes the roots to grow longer and become soft, causing roots to gather on the pot wall and form a root band, which eventually causes aging and poor growth.

In order to solve these problems,
No. 25 proposes a transplant pot in which thermoplastic synthetic fiber webs are partially thermocompressed and bonded. The pot has excellent air permeability and water permeability, but because it uses thermoplastic synthetic fibers, it has poor water retention and requires frequent watering.

The present invention has been made in view of the problems mentioned above,
The purpose of the present invention is to provide a durable transplanting pot that has air permeability, water permeability, and appropriate moisture absorption and water retention properties.

(Means for solving the problems between the two) The purpose of the above is to create a film made of a film body made by laminating and bonding multiple sheets of polyvinyl alcohol thin film having a large number of striped small cracks. This is achieved by using a transplant pot.

Polyvinyl alcohol having a large number of small striations as used in the present invention (hereinafter polyvinyl alcohol is abbreviated as PVA)
The thin film preferably has an average degree of polymerization of 1400 or more and a saponification change of 3.
Aqueous dispersion or aqueous solution of at least 8.5% PVA (at least one type and, if necessary, a plasticizer such as glycerin or polyalkylene ether) is prepared by casting, coagulation, or extrusion. It is obtained by slitting, stretching, heat-treating, and widening a PVA-based thin film obtained by forming a film by a known film-forming method such as the method.

Any known method may be used to form a PVA-based thin film having a large number of fat-like small fissures by slitting, stretching, heat-treating, and widening the PVA-based thin film. For example, a PVA thin film containing PVA with an average degree of polymerization of 1750 and a degree of saponification of 99.5% and 10% by weight of glycerin as a plasticizer is slit into appropriate widths with a Cameron cutter or razor blade, and then 5.5% at 180°C or higher. Stretched to more than twice the original size, then heat treated at 200°C or more, with a widening ratio of 1.0 to 2.
You can get it out by expanding it twice. The stretching method can be easily carried out, for example, by using rollers or a chamber under heating and utilizing the speed difference between two sets of pinch rolls, and if necessary, multistage stretching of two or more stages may be performed. .

Further, the heat treatment may be performed by any known method, and is easily carried out using a chamber or cylinder heated to 200°C or higher, but in order to further enhance the heat treatment effect, it is better to use the latter cylinder. preferable.

Further, the timing of the heat treatment is usually 20 to 60 seconds. Furthermore, any known method may be used to widen the width, and it can be easily carried out using a cross guider one-way method, a spring method, or the like. A PVA thin film with an average degree of polymerization of 1400 or less and a saponification degree of 98.5% or less is unfavorable in terms of practical dimensional stability and strength of the resulting PVA thin film, which has a large number of striped small fissures. . In addition, if the stretching temperature is below 180°C, there will be a problem in terms of stretchability, and if the stretching ratio is lower than 5.5 times, the splitting properties and the strength of the PVA thin film with many striped small tears will be reduced. Practical dimensional stability is poor, which is not preferable. Furthermore, if the heat treatment temperature is lower than 200°C, the heat setting effect will be poor and the practical dimensional stability will be poor, which is also not preferred.

The upper limit of the stretching and heat treatment temperature is a temperature that does not cause thermal decomposition, generally 220 to 250°C.

A PVA thin film with many striped small cracks is laminated on the warp and t! 1 may be any known method. For example, after applying a PVA-based binder to a PVA-based thin film having striped small cracks running in the warp direction by a known method such as a roll coater method or a dipping method,
Lamination can be easily performed by supplying a PVA-based thin film having small streak-like fissures perpendicular to the weft direction and drying it.

In the present invention, the number of layers to be laminated is usually 2 to 3, and the porosity of the striped small joints is 0.1 to 25.
% is preferable, and the area distributed over the entire surface is 20 mm.
It is preferable to have uniform small cracks of t or less.

(Function) Since the present invention uses a PVA-based material, it is extremely resistant to UV deterioration and has excellent weather resistance. In addition, the PVA-based thin film is stretched after slitting to improve the molecular arrangement, and is heat treated. This eliminates moisture absorption and significant swelling when absorbing water, which are inherent disadvantages of PVA-based materials, and imparts practical strength, resulting in excellent durability.

In addition, the provision of a large number of small striped openings and the hydrophilic P
Since it uses VA material, it has breathability, water permeability, and water retention performance. To this end, it has a function that automatically adjusts the amount of moisture that permeates in response to various conditions such as soil temperature, outside temperature, and soil water molecules fi. On the other hand, when the amount of water supplied is small, it absorbs moisture from the atmosphere and prevents the soil from drying out abnormally.

In addition, PVA-based materials emit infrared rays mainly in the 6-17μ wavelength range, which is the cause of sudden temperature drops at night.

That is, the transmittance of heat rays is extremely low, for example, about 1/4 that of polyethylene, and about 1/4 that of polyvinyl chloride, which has relatively high moisture retention.
Since only 2 can pass through, it has high heat retention. Also,
When the temperature rises rapidly during the day, the water-retaining properties of the PVA material prevent excessive temperature rise due to the latent heat of evaporation from the sides.

(Example) Next, the present invention will be explained in more detail based on examples.

As a PVA-based film, the product name is “BELTUFF N-2050”.
J, “Beltuff 8-2950 J, “Beltuff B-29
50J (manufactured by Kanebo Co., Ltd.) was used.

This product is made by slitting, stretching (5.5 times), heat treatment (215 times), and heat treating (215
°C), a small striped part (A in Figure 1) is provided, and the width is widened (widening ratio: 1.0 times when used for lamination in the longitudinal direction, 2.2 times when used for lamination in the latitudinal direction). ), and by laminating and bonding them in the meridian lines, as shown in Figure 2, the film (11) widened in the weft and the film (12) widened in the warp intersect and have a small gap A. It is something. In addition, the porosity of each product is 0
~2%, [Beltuff N-2060J is transparent,
Beltuff 8-2950J is a silver color coated with aluminum powder, and Beltuff B-2950J is colored black with a pigment.The film body is cut and bonded with a polyvinyl alcohol aqueous solution, and the bottom diameter is B g mm. A pot for transplantation according to an example of the present invention having an upper opening diameter i l Q mm and a height of 86 pots was obtained.

Since the transplant pot of the present invention has the minute void A mentioned above, it does not require a hole for draining water, and therefore does not have a hole at the bottom.

For comparison, a commercially available polyethylene transplanting pot of the same size and having a drainage hole at the bottom was prepared.

Next, cyclamen seedlings were raised using the transplant pot of the present invention and a commercially available pot. Cyclamen prefers a climate that is cool in summer and warm in winter, and the optimum growing temperature is 20°C during the day and 12-13°C at night. Diseases often occur when the temperature exceeds 25°C and it is humid. This is what is said to happen.

Hereinafter, the results of comparing the conditions of seedlings raised in transplant pots obtained in Examples of the present invention with commercially available products in terms of rooting, growth degree, and variation in growth will be described.

Regarding rooting, growth rate, and variation in growth, see 1.
Judgment was made by visual observation by 0 experts.

The criteria for this judgment are as follows.

(roots) ○: Few.

△: Normal.

×: Many.

(growth rate) ◎: Very excellent.

○: Excellent.

△: Normal.

×: Inferior.

(variation in growth) O: Not many.

△: Normal.

×: Many.

Table 1 As is clear from the results in Table 1, the transplanting bot of the present invention has an extremely low discard rate of seedlings due to rooting compared to commercially available pots, and also has an extremely high growth rate.
The seedling-raising effect has been greatly improved. Furthermore, when the transplanting pot of the present invention progresses and pops up, there is no drainage hole at the bottom of the pot, so there is no soil spillage or roots popping out, and the workability is good.

(Effects of the Invention) The transplanting pot of the present invention has air permeability, water permeability, water retention, and durability, and there is no soil spillage or root protrusion during planting, and the waste rate of seedlings is low. Because of its high strength, it is suitable for agricultural and public use.

[Brief explanation of drawings]

Figure 1 shows a thin film made by slitting, stretching, and heat-treating a PVA-based film to provide small streak-like tears, and Figure 2 shows the thin film in Figure 1 after being widened, laminated in the warp and warp, and bonded. FIG. Explanation of symbols (10): Polyvinyl alcohol film. (11)...Polyfilm widened to the great extent, (12)...Polyfilm widened to the embryo. A...Striped small dehiscence. Vinyl alcohol system Vinyl alcohol family tree

Claims (1)

[Claims] (1) A transplant pot consisting of a film body made by laminating and bonding multiple sheets of polyvinyl alcohol thin film having a large number of striped small tears.