JPH08207954A - Uneven mesh-form sheet - Google Patents

Abstract

PURPOSE: To provide an uneven mesh-form sheet which has an air permeability or water passing property and cushioning property together with a thickness, and is suitable for various types of underlayer materials or water draining materials, etc. CONSTITUTION: An uneven mesh-form sheet 1 is obtained by forming a large number of protuberances 3 continuously and under a zig-zag arrangement on a net-form sheet 2. The protuberances 3 are alternately formed on the front and rear sides of the uneven mesh-form sheet 1, and a protruding part 3A on the front surface forms a recessed part 3b on the rear surface. Also, it is preferable that the top of the protuberance 3 presents a flat surface. The longitudinal and lateral meshes of the net-form sheet are both 0.1-3.0mm, preferably 0.52-2.0mm. The thickness of the sheet is 0.3-2.0mm, preferably 0.5-1.5mm. Also, the height (h) of the protuberance 3 is 10-20mm, preferably 3.0-15mm. A pitch (p) is 10-30mm, preferably 15-20mm. A thermoplastic resin is suitably used as the material for the sheet 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concavo-convex reticulated sheet, and more particularly to a concavo-convex reticulated sheet which can be used as various underlaying materials, draining materials, etc. Is.

[0002]

2. Description of the Related Art Conventionally, various underlay materials, such as underlay materials for growing fruits and vegetables, partition plates between packages being transported, underlay materials for product cases, etc., or draining materials such as filters for preventing clogging of underdrain pipes, kitchens, etc. In many cases, it is required that the material used for the drainage material used for the drainage port, the drainage material for civil engineering work, and the like has a certain thickness and retains air permeability or water permeability. However, no such material has been known to date. In particular, since the above performance is important for the underlayment material for growing fruits and vegetables, this example will be described below.

Conventionally, there are two methods for growing fruits and vegetables such as melons: a method of growing fruits and vegetables separated from the ground surface and a method of placing fruits and vegetables on the ground. In the former method, a horticultural net is stretched vertically from the ground, and the stalks of fruits and vegetables are crawled on the net to grow. Fruits and vegetables that grow in the middle of the stem need to be hung by various methods and held until harvest so that they do not fall by their own weight. In contrast,
In the latter method, the stems of fruits and vegetables are allowed to crawl freely on the ground to grow. In this case, since there is a concern that the fruits and vegetables will be soiled or have a high humidity disorder, a straw or pedestal should usually be placed under the fruits and vegetables to reduce contact with the ground. As described above, in the conventional growing method, a gardening net must be stretched or fruits and vegetables must be hung one by one, or fruits and vegetables must be prepared on a pedestal with high cost, and one by one carefully The problem was that I had to be careful and ride on it. Therefore, there is a demand for an underlayment material for cultivating fruits and vegetables, which is capable of preventing soiling and humid damage and saving labor by ensuring a distance between the fruits and vegetables and the ground.

[0004]

SUMMARY OF THE INVENTION In view of the above circumstances, it is an object of the present invention to provide a concavo-convex reticulated sheet that secures voids with a thickness due to concavities and convexities and retains air permeability or water permeability and cushioning properties. And

[0005]

The concavo-convex mesh sheet of the present invention is characterized in that a large number of protrusions are formed on the net sheet. It is preferable that a large number of protrusions are alternately formed on the front and back of the sheet. Due to the projections and depressions formed by the projections, the sheet has a thickness for ensuring a void.

[0006]

1 is a partial perspective view showing an example of an uneven mesh sheet of the present invention. The concavo-convex net-like sheet 1 is formed by forming a large number of protrusions 3 on a net-like sheet 2 continuously and in a staggered arrangement. These protrusions 3 are alternately formed on the front and back of the concavo-convex mesh sheet 1, and the convex portion 3A on the front surface forms the concave portion 3b on the rear surface, and the concave portion 3 on the front surface.
B has a convex portion 3a formed on its back surface. The tops of the protrusions 3 preferably have a flat surface, and between the protrusions 3A and 3A that are diagonally adjacent to each other (or the recess 3b).
And 3b) and between the concave portions 3B and 3B (or the convex portion 3).
It is preferable that (between a and 3a) is a continuous curved surface and changes smoothly. FIG. 2 is a partially enlarged plan view of the flat net-shaped sheet 2 before processing. The vertical and horizontal meshes a and b of the net sheet 2 are both 0.1 to 3.0 m.
m, preferably 0.5 to 2.0 mm. If the mesh size is less than 0.1 mm, drainage and air permeability are insufficient,
Further, if it exceeds 3.0 mm, there is a concern that the protrusion 3 may be damaged during processing, which is not preferable. The net sheet 2 has a thickness of 0.3 to 2.0 mm, preferably 0.5 to 1.5 mm. If the thickness is less than 0.3 mm, the load may not be able to withstand the load as the underlaying material when the protrusions 3 are high.

The height h of the protrusions 3 formed on the net-like sheet 2 is 1.0 to 20 mm, preferably 3.0 to 15 m.
m. When h is less than 1.0 mm, it is too thin to prevent soiling and humidity damage when used as underlayment for fruits and vegetables, and when it exceeds 20 mm, it may not be able to withstand the load as underlayment. Neither is preferable. The pitch p of the protrusions 3 is 10 to 30 mm,
It is preferably 15 to 20 mm. If p exceeds 30 mm, it is difficult to stabilize the article on the sheet. It should be noted that the protrusions 3 are alternately formed on the front and back of the concavo-convex net-like sheet 1, for example, by forming the convex portions 3A on the front surface to become the concave portions 3b on the back surface, the shapes of the front and back surfaces are the same, and the front and back surfaces are not distinguished. The uneven mesh sheet 1 can be used, and the workability is improved.

To form the protrusion 3, the gear 3 is pressed from both sides of the flat net-like sheet 2 to form the protrusion 3.
Forming an embossing roller, for example, Japanese Patent Publication No. 5-121
The device disclosed in Japanese Patent No. 39 can be used. As the shape of the projection 3, various shapes such as a cylindrical shape, a polygonal prism shape, a truncated cone shape, a truncated pyramid shape, an eyebrow shape, and a dome shape can be used. Further, as the arrangement of the protrusions 3, various arrangements such as a square arrangement, an oblique arrangement, and an irregular arrangement can be used. Also,
The projections 3 may be convex stripes, and the entire uneven mesh sheet 1 may be corrugated.

FIG. 3 is an explanatory view showing a state in which the protrusion 3 is formed by the embossing roller. Gears 4 that mesh with each other
By inserting the net-like sheet 2 between a and 4b and plastically deforming the tooth tips from both sides, the net-like sheet 2
Protrusions 3 are formed on the ridges to produce the uneven mesh sheet 1. A plurality of sets of gears are arranged in a direction perpendicular to the drawing. In the case shown in FIG. 3, the projections 3 are formed on both the front surface and the back surface of the net-shaped sheet 2, but the projections 3 may be formed only on one surface side of the front surface or the back surface. Also, the adjacent protrusions 3
The distance between the protrusions 3 may be increased so that the protrusions 3 remain flat.

As the material for the net yarn of the net-like sheet 2 used in the present invention, any material can be used as long as it is a thermoplastic resin. Specifically, polyolefins,
Polyvinyl chloride, polycarbonate, polystyrene, A
BS etc. are mentioned. However, it is preferable that the material resin has appropriate rigidity so that the unevenness of the sheet is not crushed by the load when used as an underlay material. Polypropylene is particularly preferable because it has excellent water resistance, chemical resistance, and heat resistance. The unprocessed net-shaped sheet 2 is preferably unstretched, and is partially stretched depending on the molding temperature in the process of molding the protrusions.

When the uneven mesh sheet of the present invention is used as an underlayment sheet for growing fruits and vegetables, it is laid in the field before the fruits and fruits are set, or after the fruits and fruits are laid under the fruits and vegetables, so that the soiling of the fruits and vegetables can be reduced. Humidity disorders can be easily prevented. In addition, the sheet of the present invention is easy to collect after harvest of fruits and vegetables, and is therefore effective for reuse. When it is used as a partition plate for carrying luggage, the cushioning property and the air permeability between the luggage can be maintained, and the luggage is not significantly damaged even when it is transported for a long time.
The underlay material of the product case can absorb the shock and protect the product due to its cushioning property. Further, when used as a filter for preventing clogging of an underdrain pipe, since a substantial filtration area per unit cross-sectional area is large, clogging hardly occurs, and the function as a filter can be maintained for a long time. As a draining material used in a kitchen or the like, clogging is less likely to occur due to a large filtration area even with respect to easily clogged garbage. Further, it is particularly suitable as a drainage material for civil engineering work because of its large strength and large filtration area, and a large amount of accumulated water can be drained in a short time.

[0012]

【Example】

<Example 1> As the net sheet 2, an extrusion net made of polypropylene (trade name: Nisseki Conwed Net XN9567, manufactured by Conwed Co., Ltd.) was used, and the method shown in Fig. 3 (Japanese Patent Publication No. 5-12139). ) Was used to produce an uneven mesh sheet 1 shown in FIG. The net-like sheet 2 has meshes a and b of 1.0 mm and a thickness of 0.5 mm, a protrusion height (h) of 5 mm, and an uneven pitch (p) of 20 mm. This was cut into a width of about 30 cm, spread on a melon field, and the fruit-bearing melon was put on this and grown. In the growing process of the melon, there was no soil burn or moisture damage, and good quality melon could be harvested. Further, since the present invention is in the form of a sheet, it can be easily laid, has excellent workability as compared with the conventional method of mounting on a pedestal, and can save labor.

<Embodiment 2> FIG. 4 is a schematic vertical sectional view showing a state of use of a drainage material for civil engineering work. In order to discharge the water 6 accumulated on the land 9 having poor water absorbability contacting the wall 5 during the construction from the lower part of the wall surface, the uneven mesh sheet 1 was placed in parallel with the wall 5 via the nonwoven fabric 7. Water 6 is an uneven mesh sheet 1
Through the inside of the non-woven fabric 7 in parallel with the wall surface,
It flowed into the drain pipe 8 installed below the nonwoven fabric 7. In addition, an appropriate water collecting port 8a is provided on the upper part of the drain pipe 8,
The water flowing down in the nonwoven fabric 7 is discharged into the drainage pipe 8. With the above structure, the water 6 can be discharged through the drain pipe 8 in a short time, and no clogging occurs during that time.

[0014]

According to the concavo-convex net-like sheet of the present invention, the concavities and convexities of the projections impart a thickness to the sheet, whereby voids can be secured and air permeability, water permeability, and cushioning properties can be maintained. Therefore, when it is used as an underlaying material for growing fruits and vegetables such as melons, it is possible to prevent soiling and humidity damage and simplify the work up to harvesting. In addition, as a partition plate between parcels during transportation, cushioning property and breathability are retained to protect the parcel, and as an underlay material of a product case, the cushioning property can protect the product from impact. Further, when used as a filter for preventing clogging of an underdrain pipe, since the substantial filtration area is large, clogging is unlikely to occur, and clogging is unlikely to occur even as a draining material for handling kitchen waste in a kitchen or the like.
Further, it is suitable as a drainage material for civil engineering work because it has a large strength and a large filtration area, and a large amount of water can be discharged in a short time. The sheet of the present invention is low in cost, and can be washed and repeatedly used.

[Brief description of drawings]

FIG. 1 is a partial perspective view of an example of an uneven mesh sheet.

FIG. 2 is a partially enlarged plan view of a net-shaped sheet before processing.

FIG. 3 is an explanatory diagram showing a state in which a protrusion is formed.

FIG. 4 is a schematic vertical sectional view showing a usage state of a drainage material for civil engineering work.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Uneven mesh sheet 2 Net-like sheet 3 Projection 3A Front surface convex portion 3a Back surface convex portion 3B Surface concave portion 3b Back surface concave portion 4a, 4b Gear 5 wall 6 Water 7 Non-woven fabric 8 Drain pipe 8a Water inlet 9 Land a, b eyes When the height of the protrusion is the pitch of the protrusion

Claims (2)

[Claims] 1. A concavo-convex net-like sheet comprising a net-like sheet having a large number of projections formed thereon. 2. The concavo-convex net-like sheet according to claim 1, wherein the plurality of protrusions are alternately formed on the front and back sides of the sheet.