JPS62250257A - Reticulated member and its production - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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 cultivation, fish reefs (for spawning), etc. The present invention relates to a net-like member that can also be used.

[Conventional technology]

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

FIG. 4 shows a conventional string-like contact material, with FIG. 4(a) being a side view and FIG. 4(b) being a sectional view thereof. This contact material■
is a string-like member whose outer surface is covered with a large number of rings of thin fibers such as vinylidene chloride.For example, the outer diameter of the molding is 25+++m, and the tensile strength is about 1OK9.

This contact material (■) has a length of 1, for example, a 1rrL width extension rod.
3. Tighten the upper and lower ends of the ~5rfL contact material ■.
It is used by stringing multiple pieces at intervals of 0 to 50 mm and hanging them at predetermined intervals in a contact aeration tank.Compared to conventional contact materials, ■High porosity; Since the flow rate in the tank can be fast, the contact effect is good, and since the amount of retained sludge is large, each load can be increased. ■Since it is string-shaped, it can be installed freely inside the tank.

Settings suitable for tank structure and volume load can be made.

There are such advantages.

[Problem that the invention seeks to solve]

However, when activated sludge adheres to the fibers of the ring, the string-like contact material (1) becomes covered with a sticky substance, and the entire ring becomes one rod-shaped, clogging the material. The problem was that the contact area was significantly reduced.

The present invention has been made to solve these problems, and is to provide a contact material that has the above-mentioned properties of the String-like Contact Material Co., Ltd. and does not reduce the contact efficiency.

and to obtain a highly productive manufacturing method thereof. .

[Means to solve the problem]

(11) The net-like member according to the present invention is one in which a sewing thread is sewn to a wide sheet material so as to form a continuous pattern of squares, and cuts are formed in diagonal directions in the same direction for each square. It is.

(2) The method for manufacturing a net-like member according to the present invention includes a sewing process in which sewing thread is sewn into a wide sheet material so as to form continuous squares, and the purpose of each square is sewn in a vertical and diagonal direction. This manufacturing method includes a step of forming cuts.

[For production]

(1) When the net-like member related to this voicing is held by the sewing threads on the periphery of the sheet material and stretched in the width direction, each cut opens and the sheet material forms each side of the net. The part stands up so as to form an inclined surface with respect to the sewing thread. Each side of this upright net acts as a contact surface,
The suture 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, so the efficiency of contact with wastewater is high.
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 a sewing process in which sewing thread is first sewn onto a sheet material so as to form a mesh, and a process in which cuts are made diagonally at each square. can be performed as a series of flow steps, improving productivity.

[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 9450!/rrm2) is sewn using lock stitch, chain stitch, or double chain stitch to form a diamond-shaped square. . (3) is a cut formed in the diagonal direction of the sheet material (1) between the intersection parts (2a), and the sewing thread (2) part of the sheet material (1) is marked with the arrow. A
When stretched in the direction, the sheet material (
1) opens from the cut (3), and net sides (1a) are formed on both sides of the sewing thread (2), forming a curved surface.

This net-like member (4) has a tensile strength of about 20 because the sewing thread f21 is composed of two No. 3 nylon filament sewing threads. It has sufficient tensile strength even when used as a contact material, and like conventional contact materials, it can be used as a filter floor by stacking multiple sheets on a wooden frame.
It can be used as a contact material without clogging or reducing contact efficiency.

FIG. 3 is a diagram for explaining one embodiment of the method for manufacturing the net-like member (4) shown in FIG.
) is J In this example, the width W of each side of the net to be manufactured is 10α and 12 strips are used, each having a length of 1.2 m. (5) is the sewing machine base, and the sewing machine (6a), (6
b) each have a width spacing of 2W, and (6a
) and (6b) are 12 diamond-shaped squares arranged at vertical intervals of the length l in the vertical direction, and the sheet material (1) with a width of 2W in the direction of one arrow C and the opposite direction is arrow B. Each sewing machine (6a) is oscillated in synchronization with the speed fed in the direction.
In step (6b), a triangular wave pattern seam having a width of 2W is formed to form an intersecting portion (2a). In this case, since the sewing machine (6b) is disposed at a distance l from the sewing machine (6a), the sewing machine base (5) forms a diamond-shaped square simply by performing the same rocking motion. (7) is a slitter base, with a width interval W and a vertical direction t! Slitters (8a) and (sb) are arranged at a distance of /2, and the slitters (8a) and (sb) are placed at a distance of move downwards and form cuts (3) in a staggered arrangement pattern in the vertical direction between the intersection parts (2a) and (2a) of the diamond-shaped squares. In this way, the sewing machine base (5) is swung by 2 widths in the direction of arrow C in synchronization with feeding the sheet material (1) in the direction of arrow B, and sewing is carried out with the sewing machines (6a) and (6b). At the same time, the net-like member (4) can be manufactured through a series of steps in which cuts are formed using the slitters (8a) and (sb).

In addition, in the above example, an example was shown in which a nonwoven fabric was used as the sheet material (1), but a woven fabric, a synthetic resin film material, or a sheet material in which many small diameter holes are formed in these may also be used. Furthermore, it may be one in which a synthetic resin foam sheet material is laminated on at least one side, or a foam polyurethane sheet material itself.

In addition, although we have shown an example in which nylon filament sewing thread is used as the sewing thread (2), any sewing thread that provides the necessary tensile strength may be used, and the sewing method can include lock stitching, chain stitching, double stitching, etc. Needless to say, any stitching method that provides high tensile strength, such as chain stitching, will suffice.

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

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

〔Effect of the invention〕

(1) The net-like member according to the present invention is formed by sewing a sheet material with sewing thread so as to form squares, and at the same time, the cuts made diagonally inside each square are arranged in a zigzag 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. Also, there are effects such as less decrease in contact efficiency.

(2) The method for manufacturing a net-like member according to the present invention includes a step of sewing to form a continuous stitch using a plurality of sewing machines disposed at predetermined positions, and a step of sewing the inside of each square. Since this is a method of manufacturing a net-like member by performing the step of forming cuts in the feeding direction (vertical direction) of the sheet material 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 a state in which the net-like member of this embodiment is expanded into a net shape, and FIG. 3 is the portion shown in FIG. ...cut, +41 ...net-like member, (sa), (
sb)...Sewing machine, (8a), (8b)...Slitter. Note that in each figure, the same reference numerals indicate the same parts. Patent applicant: Earthnics Co., Ltd.
” - CM ”) f 3rd Ti1 Voluntary writing of procedural amendments) July 27, 1986

Claims (4)

[Claims] (1) A wide sheet material in which cuts of a predetermined length are arranged in a staggered manner with narrow intervals in the longitudinal direction and at predetermined intervals in the width direction, and the cut intersects at the part between the above cuts. It consists of multiple threads sewn over the entire surface of the sheet material to form a square, and when the sheet material is stretched in both directions by holding the threads on both sides, the sheet material A net-like member that opens from a cut and stands upright forming a curved surface that is inclined with respect to the direction of extension of the sewing thread. (2) The net-like member according to claim 1, wherein the sewing thread is sewn by lock stitch, chain stitch, or double chain stitch. (3) 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. The described net-like member. (4) A sewing process in which sewing thread is sewn into a wide sheet material to form continuous squares, and the sheet material is passed through each of the diamond-shaped patterns to form vertical cuts leaving the intersections of the sewing threads. A method for manufacturing a net-like member, comprising the step of: