JPH0124904B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention is applicable not only to contact materials for wastewater treatment filter beds, but also to earth retaining materials for earthworks, bed materials for hydroponic culture, fish reefs (for spawning), etc. This invention relates to a net-like member that can be used for

[Conventional technology]

Hereinafter, the contact material will be explained as an example.

FIG. 4 is a diagram showing a conventional string-like contact material, in which FIG. 4A is a side view and FIG. 4B is a sectional view thereof. This contact material 20 is a string-like member whose outer surface is covered with a large number of rings of thin fibers such as vinylidene chloride, and has a molded shape with an outer diameter of 25 mm and a tensile strength of about 10 kg, for example. There is.

This contact material 20 can be applied to, for example, a 1m wide expanded rod.
A plurality of contact materials 20 each having a length of 1 to 5 m are strung together at intervals of 30 to 50 mm so that the upper and lower ends are tied together, and the contact materials 20 are hung at predetermined intervals in a contact aeration tank for use. Compared to conventional contact materials, it has a higher porosity and a faster flow rate in the tank, resulting in a better contact effect, and because it holds a larger amount of sludge, a larger volume load can be achieved. Since it is string-shaped, it can be installed freely inside the tank, and settings can be made to suit the structure and volumetric load of the tank. There are some advantages.

[Problem that the invention seeks to solve]

However, as the activated sludge adheres to the fibers of the ring-shaped contact material 20, the surface becomes covered with a sticky substance, and the string-like contact material 20 becomes clogged, with the whole becoming one rod-shaped. There was a problem that the contact area was significantly reduced.

The present invention has been made to solve these problems, and aims to obtain a contact material that maintains the above-mentioned characteristics of the string-like contact material 20 and which does not reduce the contact efficiency, and to obtain a method for manufacturing the same with high productivity. With the goal.

[Means to solve the problem]

(1) In the net-like member according to the present invention, sewing thread is sewn into a wide sheet material so as to form a continuous pattern of squares, and cuts are formed in each square in the same diagonal direction. This is what I did.

(2) The method for manufacturing a net-like member according to the present invention includes:
This is a manufacturing method that includes a sewing process in which sewing thread is sewn into a wide sheet material to form continuous squares, and a process in which cuts are formed in each vertical diagonal direction within each square.

[Effect]

(1) When the net-like member according to the present invention is stretched in the width direction by holding the sewing thread portion on the periphery of the sheet material, each cut is opened and the net-like member is stretched into a net shape, and the sheet material forming each side of the net is stretched in the width direction. The portion stands up so as to form an inclined surface with respect to the sewing thread. Each side of this erected net acts as a contact surface, and the thread supports the tensile load applied to this net-like member. When this net-like member is used as a contact material, microorganisms adhere to the surface of each side of the net, and each side of the net swings according to the flow of wastewater, resulting in high contact efficiency with wastewater. Even if the amount of attached microorganisms increases, the surface area hardly changes, so contact efficiency does not decrease.

(2) The method for manufacturing a net-like member according to the present invention includes:
The sewing process of sewing the sewing thread into the sheet material so as to form squares, and the process of forming diagonal cuts within each square, can be performed as a series of flow processes, making production easier. Improves sex.

[Embodiments of the invention]

(1) Fig. 1 is a front view of an embodiment of the net-like member according to the present invention, and 1 is a wide sheet material, for example, made of a nonwoven fabric with a width W of 2 m and a length of several tens of meters.
(2) is a sewing thread, for example, nylon filament sewing thread type number 3 (tensile strength 9450g/mm ² ) is sewn with lockstitch, chain stitch, or double chain stitch to form a diamond-shaped square. . (3) is a cut formed in each square of the sheet material 1 in the vertical diagonal direction between the intersection parts 2a, and extends in the direction of arrow A with the sewing thread 2 part of the sheet material 1. When,
As shown in FIG. 2, the sheet material 1 is opened from the cut 3, and net sides 1a are formed on both sides of the sewing thread 2, forming curved surfaces and standing upright.

This net-like member 4 has a tensile strength of about 20 kg because the sewing thread 2 is composed of two No. 3 nylon filament threads, and has sufficient tensile strength even when used as a contact material. As with conventional contact materials, even if multiple sheets are stacked and stretched over a frame and used for filter beds, they can be used as a contact material without clogging or deterioration of contact efficiency.

FIG. 3 is a diagram for explaining an embodiment of the method for manufacturing the net-like member 4 shown in FIG. 12 stripes are formed when w is 10 cm.
A 1.2m one is used. 5 is the sewing machine base;
Sewing machines 6a and 6b are each arranged at a width interval of 2w, and 12 sewing machines 6a and 6b are arranged at a vertical interval of 1, which is the length l in the vertical direction of the diamond-shaped squares, and are arranged in the direction of arrow C and its opposite direction. The sheet material 1 is oscillated in synchronization with the speed at which the sheet material 1 is fed in the direction of arrow B, so that each sewing machine 6a, 6b has a width of 2w.
Form a triangular wave pattern seam,
A crossing portion 2a is formed. In this case, since the sewing machine 6b is disposed at a distance l from the sewing machine 6a, a diamond-shaped square is formed by simply making the sewing machine base 5 perform the same swinging motion.
7 is a sliver base with width interval w and lengthwise l/
The slits 8a are arranged at a distance of 2,
8b is arranged, and moves up and down with respect to the paper surface in synchronization with the feeding of the sheet material 1 in the direction of arrow B, and moves vertically in a staggered manner between the intersecting parts 2a and 2a of the diamond-shaped squares. The cut 3 is also formed with the arrangement pattern of. In this way, in synchronization with feeding the sheet material 1 in the direction of arrow B, the sewing machine base 5 is swung by a width of 2w in the direction of arrow C to move the sewing machines 6a and 6.
While sewing with b, slits 8a, 8
The net-like member 4 can also be manufactured through the series of steps of forming the cuts in b.

In addition, in the above embodiment, an example was shown in which a nonwoven fabric was used as the sheet material 1, but it may also be a woven fabric, a synthetic resin film material, or a sheet material in which a large number of small-diameter through holes are formed in these materials. may have a synthetic resin foam sheet material pasted on at least one side, or may be a foam polyurethane sheet material itself.

In addition, although an example is shown in which nylon filament sewing thread is used as the sewing thread 2, any sewing thread that can provide the necessary tensile strength may be used, and the sewing method may be lock stitch, chain stitch, or double chain stitch. Needless to say, any sewing method that provides high tensile strength is sufficient.

Further, in the above embodiment, the seams form diamond-shaped squares, but the shape is not limited to this, and a sinusoidal seam pattern or the like may be used.

Furthermore, in the above embodiment, an example was explained in which it is used as a contact material, but it can also be used as an earth retaining material by laying it on a slope in earthworks etc.
In addition, we also use bedding materials for hydroponic culture, fish reefs (for spawning), etc.
It can be used for various purposes, is easy to handle, can be used for a long period of time, and has suitable functions in terms of the functions required for each purpose.

〔Effect of the invention〕

(1) The net-like member according to the present invention is formed by sewing the sheet material with sewing thread so as to form squares, and at the same time, the net-like member is formed so that cuts made diagonally within each square are arranged in a staggered pattern. Therefore, when the cut is extended in the direction in which it is opened, it becomes a net shape with sides that are inclined to the sewing thread, so when used as a contact material for filter beds, high contact efficiency can be obtained and it can be used for a long time. This has the effect of reducing the drop in contact efficiency.

(2) The method for manufacturing a net-like member according to the present invention includes:
A process in which multiple sewing machines placed at predetermined positions are used to sew to form continuous squares, and cuts are made within each square in the feeding direction (vertical direction) of the sheet material. Since this is a method of manufacturing a net-shaped member by performing the steps of 1 and 2 as a series of operations, it is effective in manufacturing with high productivity.

[Brief explanation of drawings]

FIG. 1 is a plan view of an embodiment of the present invention, FIG. 2 is a plan view showing the net-like member of this embodiment in a stretched state, and FIG. 3 is the net-like member shown in FIG. 1. A plan view showing an example of the manufacturing method, No. 4
The figure shows a conventional string-like contact material. 1... Wide sheet material, 2... Sewing thread, 2a...
Crossing part, 3... cut, 4... net-like member,
6a, 6b... Sewing machine, 8a, 8b... Slipper. Note that in each figure, the same reference numerals indicate the same parts.

Claims (1)

[Claims] 1. Cuts of a predetermined length are spaced narrowly in the vertical direction,
and a wide sheet material arranged in a staggered manner at predetermined intervals in the width direction, and sewn over the entire surface of the sheet material so as to form squares that intersect in the areas between the cuts. When the sheet material is stretched in both directions by holding the sewing thread portions on both sides of the sheet material, the sheet material opens from each cut and forms a curved surface that is inclined with respect to the stretching direction of the sewing thread. A net-like member configured to stand upright. 2. The net-like member according to claim 1, wherein the thread is sewn by lock stitch, chain stitch, or double chain stitch. 3. The sheet material according to claim 1, wherein the sheet material is a woven fabric, a non-woven fabric, a synthetic resin sheet material, a perforated sheet material in which a large number of small holes are formed, or a sheet material whose at least one side is a foamed material. Net-like member. 4 A sewing process in which sewing thread is sewn onto a wide sheet material to form continuous squares, and a process in which vertical cuts are formed in the sheet material in each of the diamond-shaped patterns, leaving the intersections of the sewing threads. A method for manufacturing a net-like member, comprising: