JP2923608B2 - Contact filter media - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter medium comprising a warp knitted fabric, particularly a contact filter medium. More specifically, one side has a sheet-like ground structure excellent in elasticity, air permeability, and water permeability, and one side has an uneven surface. The present invention relates to the above-mentioned contact filter medium comprising a warp knitted fabric which is rich in undulations while maintaining a pleated nap.

[0002]

2. Description of the Related Art Conventionally, for purifying rivers, purifying domestic wastewater, or purifying with an air purifier or the like, a fiber material is used as a filter material, for example, using a nonwoven fabric or crushed stone aggregate or a wire as a core material. A so-called scourer-like material is known and widely used.On the other hand, a plastic contact material, a nonwoven fabric contact material, and a synthetic fiber cloth are used as contact filter media for decomposing organic substances by microorganisms and purifying water quality. For example, a string-shaped contact material, a string-shaped contact material, or the like is used.

[0003]

However, since the filter material is generally used in a form of being suspended from the upper part in a filtration tank, the filter material is entangled with other filter materials due to increased water caused by a typhoon or the like. There are inconveniences in maintenance such as an increase in resetting cost due to damage, etc.In addition, the use form is restricted such as a long and thin rod shape in order to increase the filtration area by arranging the fibers radially. there were.

[0004] More specifically, by arranging the fibers radially, from the tip to the middle, microorganisms, particularly eutrophic substances such as aerobic bacteria, are purified by degradation treatment, and anaerobic bacteria in the center. In order to form a cycle to decompose dead bodies such as surface microbial communities, activated sludge accumulates from the central part due to continuous use, and eventually a significant decrease in purification capacity due to covering the entire fiber structure Occurred and eventually resulted in maintenance problems, such as manual cleaning.

[0005] On the other hand, those using ordinary filter media are limited in their installation locations, and do not consider the action of decomposing organic substances due to propagation of microorganisms, etc., and simply purify water as a filler or the like. It's just

[0006] The present invention addresses the above situation,
Paying particular attention to the use of warp knitted fabric, it is suitable for decomposing the above organic matter inside the knitted fabric, and by arranging yarn that contributes to form stability, it reduces maintenance after laying and increases the filtration area, and It is an object of the present invention to provide a contact filter medium in which a use form can be arbitrarily selected by setting.

[0007]

That is, the feature of the present invention that meets the above-mentioned object is as follows. First, a large number of parallel chain stitch rows extending in the front and rear two rows, each of which is knitted in the wale direction. The zigzag sideways alternately engaging and engaging the opposing loops of the front and rear opposing chain stitch rows, and the binding yarns for connecting the two chain stitch rows, and the parallel front chain stitch row A plurality of zigzag-shaped courses are laterally swung to form a front-side insertion yarn for knitting a sheet-like ground knitted fabric on the front side, and a rear-side insertion yarn inserted into the rear chain stitch row to bundle the binding yarn. The two front and rear chain stitch rows connected by the connecting yarns are characterized in that a warp knitted fabric held in a napped state with respect to a sheet-like ground knitted fabric is used as a contact filter medium.

According to the second aspect of the present invention, the nap form of the warp knitted fabric is changed. In particular, the opposing loops of the chain stitch row at the zigzag position where the binding yarn does not face the front and rear chain stitch rows. Alternately and in the opposite direction, the engagement position is shifted in the stitch row direction and engaged in a zigzag shape, and the two chain stitch rows are joined to join the front and rear chain stitch rows to form a sheet-like fabric. The knitted fabric was configured so as to have a pleated napped state.

According to the third and fourth aspects of the present invention, the type of the binding yarn in each of the above structures is specified. The former uses a bulky synthetic fiber yarn as a binding yarn, and the latter uses the bulky synthetic fiber yarn. And synthetic fiber monofilament yarn.

The invention according to claims 5 and 6 gives a change to the knitting of the sheet-like ground knitted fabric in the above configuration, the former knitting a half structure as a ground structure, and the latter knitting a mesh structure as a ground structure. I have.

[0011]

[Function] When a warp knitted fabric having a sheet-like knitted fabric on one side and a napped state on the other side is brought into contact with sewage such as a river or a pond as a filter medium, microorganisms adhere to the nap and the knitted fabric.・ Propagate and decompose organic matter in sewage to purify water. The napped part and the ground knitted part on one side increase the contact area, enhance adhesion of microorganisms, and improve purification performance.

When a bulky synthetic fiber yarn is used as the binding yarn, the fiber void increases, the contact area is increased, and when a synthetic fiber monofilament yarn is used in combination, the form stability is enhanced.

Further, when the ground structure of the sheet-like ground knitted fabric is knitted with a half structure, expansion and contraction increases, and when knitted with a mesh structure, effects such as ventilation and water permeability are enhanced.

[0014]

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

1 and 2 are perspective views showing embodiments of the contact filter medium of the present invention, and FIGS. 3 to 8 are organization diagrams of the embodiments.

First, in FIG. 3, reference numerals 2 and 4 denote chain stitch rows extending in the wale direction in two front and rear rows.
Reference numeral 3 denotes a binding thread that alternately engages with the opposing loops of the front and rear opposing chain stitch rows and swings in a zigzag manner, and connects the chain stitch rows. 2
As shown in FIG. 1, the insertion yarn inserted into the front side stitch row 2 is swung in a zigzag manner from side to side for about 2 to 10 courses in a zigzag manner to be integrated with the chain stitch section as shown in FIG. The sheet-like ground knitted portions 6 are formed.

Reference numeral 5 denotes a state in which the binding yarns 3 are bundled by swinging the rear chain stitch row 4 in the lateral direction, preferably by about 2 to 4 courses, to maintain the napped state with respect to the ground knitting portion 6. As a whole, the warp knitted fabric is formed into a warp knitted fabric A as shown in FIG. 1 in which one side is in a sheet shape and the other side is in a napped state with the aid of the insertion yarn 5 to assist in maintaining the napped state.

The warp knitted fabric A having the above structure is knitted by a double Russell machine, and the front needle row F or the rear needle row B is chain-knitted to knit the front and rear chain stitch rows 2 and 4. At the same time, the front and rear chain stitch rows 2 and 4 are connected to each other with a binding yarn 3 to knit a knitted fabric in a raised state with respect to the ground structure, and the insertion yarn 1 is inserted into the chain stitch row 2 in the front needle row. The structure of one sheet-like ground knitted fabric 6 is knitted in a zigzag manner by laterally oscillating from about 2 to 10 courses, while the rear needle row is laterally skewed from about 2 to 4 courses using the insertion yarn 5. The warp knitted fabric A of the present invention is obtained by bundling the binding yarn 3 by shaking in the direction to maintain the napped state with respect to the ground knitted fabric 6.

The yarn used in the knitting of the warp knitted fabric may be a double raschel yarn such as a synthetic fiber yarn such as nylon, polyester, or polypropylene, a polyurethane elastic fiber yarn, or a natural fiber yarn such as cotton, depending on the use and purpose. Any thread can be used as long as it can be set on the machine,
Although it is arbitrarily selected, a synthetic knitting fabric or a synthetic fiber-based multifilament yarn is used for the chain knitting yarn that binds the binding yarn, and a thermoplastic synthetic fiber multifilament yarn is used for the binding yarn, especially a bulky yarn that has been subjected to bulky processing. Alternatively, it is preferable to use a synthetic fiber monofilament yarn aligned with this.

Particularly, when a monofilament is used for the binding yarn 3, it is suitable for maintaining the shape.

By using colored yarns for the yarns to be used, it is possible to consider landscapes such as ponds, riverbeds, and the sea.

FIGS. 4 and 5 show changes in the ground structure of the sheet-like ground knitted fabric 6 in the warp knitted fabric. The ground structure of the ground knitted fabric in FIG. On the other hand, FIG. 4 shows that the ground structure is expanded and contracted as half structures 7 and 8, and FIG.
With good water permeability and good shape change, the present invention can respond to each requirement as needed.

FIGS. 6 to 8 show that the warp knitted fabric A holds a knitted fabric composed of both chain stitch rows 2 and 4 and the binding yarn 3 in a raised state with respect to the ground knitted fabric 6. This shows a case where a napped state is provided.

That is, in this case, the engaging position is shifted in the stitch row direction alternately and in the opposite direction in the chain stitch row of the front needle row and the rear needle row where the binding yarn 11 does not face directly. They are engaged and zigzagged and connected by shaking, thereby forming a knitted fabric A 'as shown in FIG. 2 having a pleated shape, that is, a corrugated plate shape or a bellows shape. Note that FIGS. 7 and 8 show the deformation of the tissue shown in FIG. 6 as in FIGS. 4 and 5 with respect to FIG.
The same reference numerals indicate states of the same parts. The yarns used in FIGS. 6 to 8 are the same as those described above. Reference numeral 5 'in the drawing denotes an insertion thread inserted into the chain stitch row 4 on the rear side and having a role of reinforcement.

Each of the warp knitted fabrics obtained as described above is used as a contact filter medium by suspending it in a pond, riverbed, underwater, or the like, or fitting it into a frame as appropriate. The mode of use can be appropriately implemented according to the place of use and the situation of use.

Thus, during use, a large amount of microbial communities are fixed in the three-dimensional space volume of the knitted fabric including the binding yarns 3 and 11, and a water purifying action is achieved under an environment suitable for the coexistence conditions of the microbes.

[0027]

According to the present invention, as described above, the binding yarn is held in a raised state by the chain stitch rows on the sheet-like knitted fabric, so that the surface area as the filter medium can be effectively used and the increase can be achieved. As well as being suitable for attaching and breeding microorganisms, it can enhance the decomposing action of organic substances and improve the water purifying action.

In addition, since it is a warp knitted fabric and its installation shape can be freely selected, it can be installed in any place, and also has the advantage of oscillating at any time in water or the like and increasing the contact ratio with sewage. is there.

Further, by using a bulky synthetic fiber yarn as the binding yarn, the surface area as a filter medium can be increased, the contact ratio can be further increased, and the shape can be stabilized by using monofilament yarns in combination. In addition, by appropriately selecting the ground structure of the ground knitted fabric, it is possible to easily cope with a case where elasticity, water permeability, air permeability, and the like are required.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing an example of a warp knitted fabric used for a filter medium of the present invention.

FIG. 2 is a schematic perspective view showing another embodiment of the warp knitted fabric used for the filter medium of the present invention.

FIG. 3 is an organization diagram of one example of the warp knitted fabric according to FIG. 1, which is knitted with a chain stitch structure.

FIG. 4 is an organization chart in which the warp knitted fabric according to FIG. 1 is knitted in a half organization.

FIG. 5 is an organization chart in which the warp knitted fabric according to FIG. 1 is knitted with a mesh structure.

FIG. 6 is an organization diagram in which the warp knitted fabric according to FIG. 2 is knitted with a chain stitch structure.

FIG. 7 is an organization chart in which the warp knitted fabric according to FIG. 2 is knitted in a half organization.

FIG. 8 is an organization diagram in which the warp knitted fabric according to FIG. 2 is knitted with a mesh structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front insertion thread 2 Front chain stitch row 3 Binding thread 4 Rear chain stitch row 5 Rear insertion thread 6 Sheet knitted fabric 7,8 Half structure 9,10 Mesh structure 11 Binding yarn

Claims (6)

(57) [Claims] 1. A plurality of side-by-side chain stitch rows that are knitted and extended in the wale direction in two front and rear rows, respectively, and alternately engage with opposing loops of front and rear opposing chain stitch rows to form a zigzag shape. A binding yarn that swings sideways and connects the two chain stitch rows;
A plurality of courses are zigzagly traversed side-by-side with respect to the parallel chain stitch row on the front side, a front insertion yarn for knitting a sheet-like ground knitted fabric on the front side, and the binding yarn inserted into the rear chain stitch row on the rear side. A contact comprising a rear insertion yarn to be bundled, and a warp knitted fabric in which two front and rear chain stitch rows joined by the binding yarn are held in a napped state with respect to the sheet-like ground knitted fabric. Filter media. 2. A plurality of side-by-side chain stitch rows, each of which is knitted and extended in the wale direction in two front and rear rows, and opposing loops of chain stitch rows at zigzag positions that do not face each other in the front and rear chain stitch rows. And, in the opposite direction, the engaging position is shifted in the stitch direction, and the zigzag side is wound in a zigzag shape to connect the two chain stitch rows, and the zigzag A plurality of courses, and a front insertion yarn for knitting a sheet-like ground knitted fabric on the front side and a rear insertion yarn inserted into the rear chain stitch row to reinforce the chain stitch row. A contact filter medium comprising a warp knitted fabric in which front and rear chain stitch rows connected by a yarn are held in a pleated raised state with respect to a sheet-like ground knitted fabric. 3. The binding yarn according to claim 1, wherein the binding yarn is a bulky synthetic fiber yarn.
Or the contact filter medium of 2. 4. The contact filter medium according to claim 1, wherein the binding yarn comprises both bulky synthetic fiber yarn and synthetic fiber monofilament yarn. 5. The contact filter medium according to claim 1, wherein the ground knitted fabric is knitted in a half structure. 6. The contact filter medium according to claim 1, wherein the ground knitted fabric is knitted with a mesh structure.