JP2815110B2 - Planting management sheet and manufacturing method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plant management sheet using pulp sludge discharged in a papermaking process and a method for producing the same.

[0002]

2. Description of the Related Art Non-papermaking pulp sludge discharged from a papermaking process in a paper mill is mostly incinerated.

On the other hand, in tree planting, weeds need to be harvested every year for several years after tree planting. However, since this operation requires a large amount of labor, the following planting management sheets have been developed to reduce this labor. ing. This planting management sheet is laid at the base of the seedling to control the growth of weeds.

[0004] The first planting management sheet is a sheet obtained by bonding a high-density plain weave burlap woven fabric to one side of a paperboard or kraft paper made of natural fiber (Japanese Utility Model Laid-Open No. 3-112241). The planting management sheet is provided with a fold for forming a bent piece for achieving close contact with the soil surface and a vegetation-permissible hole groove in a peripheral portion of a sheet body made of plant fiber such as paper. (Japanese Utility Model Application Laid-Open No. 54-182343) and the third
Is a sheet obtained by knitting a sheet made of plant fiber such as paper with a biodegradable or photodegradable plastic (JP-A-5-252838).
It is.

[0005]

However, none of the first to third planting management sheets use pulp sludge as a raw material, and pulp sludge still has an issue of effective utilization as a raw material resource. .

[0006] For each planting management sheet,
It has the following unique issues.

[0007] That is, the first planting management sheet has a problem that the paperboard or kraft paper is corroded at an early stage, has poor durability, and cannot have a long-term weed control effect. This is because in the case of permanent tree planting, the environmental conditions 5 to 6 years after planting have the greatest effect on the growth and material thereafter, and require the most management labor. The planting management sheet used for this also requires the management labor. This is because durability is required to a degree that can alleviate the problem.

[0008] In addition, the first planting management sheet has a problem that it is difficult to obtain a good fit to the laid ground. Weed suppression effect can be obtained only by laying the sheet in close contact with the ground, but high-density plain weave burlap woven fabric does not deform like the shape of the ground, and especially the surrounding area It is easy to occur, and a sufficient weed suppression effect cannot be obtained in this portion.

The second planting management sheet not only has a poor durability due to the early corrosion of the sheet body, but also has a fold provided only in the peripheral portion of the sheet body, and has a whole. Therefore, there is a problem that it is difficult to provide a sufficiently good fit to the laid ground without providing easy deformability.

Further, the third planting management sheet has a problem that not only the manufacturing cost is increased but also it is difficult to obtain a good fit to the ground on which it is laid.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to make it possible to effectively use pulp sludge, to suppress the growth of weeds over a long period of time, and to simplify production and reduce costs. It is an object of the present invention to provide a planting management sheet and a method for producing the same, which can be naturally decayed and converted into organic fertilizer.

[0012]

In order to achieve the above-mentioned object, the invention according to claim 1 is to apply a slurry-like coating material containing pulp sludge as a main component to the surface of the center of a single-faced corrugated cardboard and to dry-adhere it. The ground layer formed by the above, having a plurality of folds immersed in the ground layer by collapse of the ridge of the core in the process of forming the ground layer and peeling the liner of the single-faced cardboard, It is characterized by comprising a sheet-like body having an outer skin layer composed of the above-mentioned core with the opening of the fold part exposed.

Therefore, according to the first aspect of the present invention, the ground layer is brought into contact with the ground, and the outer skin layer is exposed to the air side to be laid. Can be.

Further, pulp sludge cellulose, which is a main component of the coating material forming the ground layer, exhibits a moderately difficult corrosion resistance, thereby imparting durability.

Further, a large number of folds are formed at a narrow interval substantially equal to the pitch of the ridges of the core, whereby easy deformation is imparted to the whole, and good fit to the laid ground is provided. Can be played.

According to a second aspect of the present invention, there is provided the planting management sheet according to the first aspect, wherein the slurry-like coating material is obtained by adding a paste to a pulp sludge that has been loosened with water and having a natural length. It is characterized in that it is obtained by mixing one or two or more kinds of functional components composed of fiber, rice paddy, humus fiber, slow-release fertilizer, and the like.

Therefore, according to the second aspect of the present invention, a strong grounding layer can be formed by the added paste, and the grounding layer can be reduced in weight, water permeability, moisture retention, and heat retention by adding a functional component. Properties and sheet strength can be improved. That is, the natural long fiber mainly contributes to the weight reduction and the improvement of the tensile and tear strength of the sheet, and the chaff and the corrosive fiber mainly contribute to the reduction in the weight, water permeability, moisture retention and heat retention. When a slow-release fertilizer is used as a functional component, a long-term fertilizing effect can be obtained.

Further, the invention according to claim 3 is to apply a slurry coating material containing pulp sludge as a main component to the surface of the core of a single-faced corrugated cardboard, and then pressurize the coated portion to equalize to a constant thickness. After drying, to adhere the coating material,
Thereafter, the liner of the single-faced cardboard is peeled and removed.

Therefore, according to the third aspect of the present invention, the ridge of the center core is inverted into a U-shape inevitably forming a fold in the step of equalizing the applied portion to a constant thickness while pressing. .

[0020]

Embodiments of the present invention will be specifically described below with reference to the drawings.

FIG. 1 shows a planting management sheet as one embodiment of the present invention. The sheet 1 has a grounding layer 8 mainly composed of pulp sludge formed on the surface of the core 3 of the single-faced cardboard 2, a plurality of folds 5 immersed in the grounding layer 8, and a single-sided surface. It is roughly configured as a sheet-like body having a skin layer 9 composed of the core 3 in which the liner 4 of the cardboard 2 is peeled off to expose the opening 5a of the fold 5.

This sheet 1 is a single-sided cardboard 2 shown in FIG.
Is manufactured according to the manufacturing process shown in FIG.

The single-sided corrugated cardboard 2 has a corrugated core 3 in which peaks 3a and valleys 3b are alternately continuous, and a valley 3b of the core 3
And a sheet-like liner 4 adhered to the sheet.

The single-sided cardboard 2 is placed so that the core 3 is located on the upper side (FIG. 3A), and a slurry-like coating material 6 containing pulp sludge as a main component is applied to the surface of the core 3. (FIG. 3 (b)).

The slurry-like coating material 6 contains pulp sludge as a main component, and a sizing agent is added to the pulp sludge. Preferably, natural long fibers, chaff, humus fibers,
It is constituted as a slurry-like composition in which one or more kinds of functional components composed of slow-release fertilizers and the like are mixed. The pulp sludge is used after the coagulated and dewatered lump discharged from the papermaking process of a paper mill is loosened with water to an appropriate water state.

For example, carboxymethylcellulose (CMC) is used as a paste, manila hemp is used as a natural long fiber, and humus fiber is used, for example, obtained by crushing dead leaves and dead trees deposited on mountain skin. Can be

As slow-release fertilizers, there are decomposition rate adjusting type fertilizers which can adjust the decomposition rate to some extent by changing the size of particles because they are weakly hygroscopic and hardly soluble in the form of nitrogen, and synthetic resins. There is a coating type in which the fertilizer component gradually dissolves through the capillaries of the coating layer, and any of these can be used. Specific examples of the decomposition rate control type include isobutylidene 2 urea, urea form (urea + formaldehyde), crotonylidene 2 urea (urea + acetaldehyde), and guanyl urea. The others are for paddy fields.

The paste imparts tackiness to the coating material 6 and contributes to stabilization of the dispersion state of the pulp sludge in the system.
A strong ground layer 8 can be formed by the addition of the paste.

Further, by adding a functional component, the weight of the ground layer 8, water permeability, moisture retention, heat retention, and the strength of the sheet 1 can be improved. That is, the natural fiber mainly contributes to the weight reduction and the improvement of the tensile and tear strength of the sheet 1, and the chaff and the humus fiber mainly contribute to the weight reduction, the water permeability, the moisture retention and the heat retention. Further, when a slow-release fertilizer is used as a functional component, a long-term fertilizing effect can be obtained.

As described above, since the functional components have different functions and effects depending on the components used, various examples of blending can be considered depending on the application. For example, in paddy fields or fallow lands, functional ingredients are not blended, and those with slightly poor water permeability can be used. Is used. Fruits and vegetables in the open field (eg eggplants, tomatoes, etc.) have a short period of use, exhibit fertilizer effects in an appropriate moisture state, and promote growth. Reference numeral 1 denotes an example of the composition of the slurry-like coating material 6 (per m ² ).

[0031]

[Table 1] Since the raw materials have different moisture contents, the capacity ratio (%)
Is convenient. In addition, humus fiber is added in place of natural long fiber and / or chaff, and the slow-release fertilizer is, for example, 0.3 vol. %.

The slurry-like coating material 6 applied to the surface of the core 3 is then leveled to a certain thickness by using a roller 7 (FIG. 3C). In this step, the ridges 3a of the core 3 are crushed by the pressure of the rollers 7 and inverted into a U-shape, and the folds 5 having openings 5a on the back surface of the core 3 and immersing in the coating material 6 are formed. Is done. In this manner, the folds 5 are inevitably formed in the process of forming the ground layer 8 without going through the steps for forming the folds 5.

The roller 7 at this time is shown in FIG.
As shown in the figure, the core 3 is installed so as to be parallel to the peak 3a, and is run in a direction perpendicular to the peak 3a. If the roller 7 is installed so as to be orthogonal to the peak 3a and runs along the peak 3a, there is a possibility that a good fold 5 may not be formed.

Next, the slurry coating material 6 is dried (FIG. 3D). In this drying step, the slurry-like coating material 6 is solidified while enclosing the fold 5, and the ground layer 8 is formed on the surface of the core 3.

After the ground layer 8 is formed, the liner 4 constituting the single-faced cardboard 2 is peeled off (FIG. 3E). In this peeling step, the peeling of the liner 3 causes the outer skin layer 9 made of the core 3 having the fold 5 with the opening 5 a exposed to the outside.
Is formed.

The planting management sheet 1 manufactured as described above is laid with the ground layer 8 in contact with the ground and the outer skin layer 9 exposed to the atmosphere, so that the laid portion is shielded from light and weeds are removed. Growth can be suppressed.

The cellulose of the pulp sludge, which is the main component of the coating material 6 forming the ground layer 8, exhibits a moderately hard corrosive property, thereby imparting the durability of the sheet 1 itself.

Further, a large number of folds 5 are formed at narrow intervals substantially equal to the pitch of the ridges 3 of the core 3, whereby easy deformation is imparted to the entire sheet 1, and And a good fit can be achieved. For example, as shown in FIG. 4, when the sheet 1 is applied to the shore 10, the sheet 1 can be bent with the fold 5 as a starting point, and can be easily formed into a shape along the cross-sectional shape of the shore 10. Thereby, the adhesion to the shore surface of the ground layer 8 is improved, and the growth of weeds can be effectively suppressed.

The folds 5 also serve as a pool for rainwater, enabling efficient water supply via the ground contact layer 8 and contributing to the promotion of growth of managed plants.

Further, since most of the grounding layer 8 of the sheet 1 is formed of inexpensive pulp sludge, pulp sludge can be effectively used, cost can be reduced, and anticorrosive raw materials can be used. Not used
It rots naturally and can be converted to organic fertilizer.

In the method of manufacturing the sheet 1, since the folds 5 can be formed in the process of equalizing the application portion of the slurry application material 6, the process for forming the folds 5 is omitted. It is unnecessary, so that the process can be simplified and the manufacturing cost can be reduced.

Further, the planting management sheet 1 having added humus fiber to improve moisture retention and heat retention can be used as a vegetable cultivation sheet in a high temperature period of summer, so that the plant management sheet 1 can be 4 to 4 times in comparison with the bare ground temperature. It can be maintained at a low temperature of 7 ° C. and can contribute to extending the cultivation period.

[0043]

According to the present invention, as described in detail above, the following effects can be obtained.

That is, according to the first aspect of the invention, pulp sludge which has been conventionally incinerated is used as a raw material, durability is imparted by moderately hard corrosiveness of cellulose of pulp sludge, To provide a good fit to the laying ground due to the easy deformation imparted to the whole by the folds having the openings exposed on the surface of the skin layer, and to easily form the ground layer and the skin layer. It is possible to effectively use pulp sludge, and to effectively suppress the growth of weeds over a long period of time, and it is easy to manufacture and can reduce the cost. A planting management sheet can be provided.

According to the second aspect of the present invention, the addition of a functional component can improve the water permeability, moisture retention and heat retention of the ground layer, and the strength of the sheet, and also has a slow effect as a functional component. When a fertilizer is used, a long-term fertilizing effect can be obtained, which can suppress the growth of weeds and promote the growth of managed plants.

Further, according to the third aspect of the present invention, the folds can be formed in a step of equalizing the coating portion to a constant thickness while applying pressure. It is possible to provide a method for manufacturing a planting management sheet, which does not require a step, can simplify the step, and can reduce the manufacturing cost.

[Brief description of the drawings]

FIG. 1 is a perspective view of a planting management sheet as one embodiment of the present invention.

FIG. 2 is a perspective view of a single-sided cardboard as a raw material of the planting management sheet of FIG.

3 shows a manufacturing process of the planting management sheet of FIG. 1,
(A) is a cross-sectional view of a single-sided cardboard, (b) is a step of applying a slurry-like coating material, (c) is a step of leveling the coating material, and (d).
7A is a cross-sectional view after the ground layer is formed by drying the coating material, and FIG.

FIG. 4 is a cross-sectional view showing an application example of the planting management sheet of FIG.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 planting management sheet 2 single-sided cardboard 3 core 4 liner 5 fold 5 a opening (of fold) 6 slurry-like coating material 8 ground layer 9 skin layer

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁶ , DB name) A01G 13/00

Claims (3)

(57) [Claims] 1. A grounding layer formed by applying a slurry-like coating material containing pulp sludge as a main component on a surface of a core of a single-sided cardboard, and drying and attaching the slurry-like coating material; and a peak of the core in the process of forming the grounding layer. Having a plurality of folds which are immersed in the grounding layer due to collapse of the portion and having a plurality of folds formed at the same time, and having an outer skin layer made of the core which exposes an opening of the fold by peeling off a liner of the single-sided cardboard. A planting management sheet comprising a sheet. 2. The planting management sheet according to claim 1, wherein the slurry-like coating material is obtained by adding a paste to pulp sludge that has been loosened with water, and to which natural long fibers, chaff, humus fibers, A planting management sheet comprising a mixture of one or more functional components comprising slow-release fertilizers. 3. A slurry-like coating material containing pulp sludge as a main component is applied to the surface of the core of a single-faced cardboard, the coated portion is pressed to a uniform thickness while being dried, and then dried. And then removing the liner of the single-faced cardboard by removing.