JP2521310Y2 - Filter cloth for suction dehydration belt of water treatment dehydrator - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter cloth for a suction dewatering belt of a belt press type dewatering machine in wastewater treatment, which has good cake releasability, moderate hardness, and durable filtration. Regarding to provide cloth.

[0002]

2. Description of the Related Art In wastewater treatment, sludge reacted in a sludge reaction tank with a coagulant is separated into cake and filtrate by using a belt press type dehydrator. The fiber material of the filter cloth used at this time is polypropylene, nylon,
Although it is polyester, polypropylene is most often used.

Further, since the cake has a good peeling property, a woven fabric made of polypropylene spun yarn is often raised and used as a filter cloth. Besides, felt and the like are also used as a filter cloth, but when a coagulant is used, clogging easily occurs, which is not preferable.

[0004]

However, it is said that the spun yarn-raised product has a weak physical strength in the transverse direction and has a problem in durability because the weft is raised. In addition, it has been pointed out that wrinkles and distortions during use can occur due to the lack of stiffness in spun yarn fabrics.

[0005]

Means for Solving the Problems The inventors of the present invention have made extensive studies on means for solving the above problems, and have established the following new techniques.

[0006] Synthetic monofilament yarn is added to the weft of synthetic fiber spun yarn to be raised to have strength and elasticity. In other words, the weft yarn is made into a monofilament core state, then woven, and then raised by means of thistle, wire or emery.

However, it is said that the cored yarn cannot be raised, and in the study by the present inventors, the spun yarn wound around the monofilament with the decorative twisted yarn and the plied yarn has a tightness of the spun yarn. It was not suitable for this application because it could hardly brush strongly.

Therefore, the present inventors apply a strong tension (0.5 to 1.0 g / D) to the monofilament yarn as shown in FIG. By tying them together at the same time, the spun yarn is arranged around the monofilament yarn with moderate softness by natural twisting by releasing the yarn, and by weaving this yarn as a weft yarn, it is possible to nap after weaving. I found that Of the composite yarn used for the weft of the present invention
Wire diameter is within the range of 3 times the diameter of monofilament thread
, Filtration rate, cake release, filtrate clarity, filter cloth
It is preferable from the balance of the life of

[0009]

The woven fabric woven with the yarn thus prepared as the weft yarn can be subjected to the raising treatment in the same manner as the conventional woven fabric with the spun yarn, has a strong strength in the weft direction, is durable, and is sucked and dehydrated. It is easy to handle because it is elastic even when it is processed as a filter cloth for belts, and it does not wrinkle during use and has excellent dimensional stability.

[0010]

[Examples] Example Warp Polypropylene spun yarn 24s / 2 (24th twin yarn) Weft polypropylene spun yarn 24s / 2x2 + polypropylene monofilament yarn 150D (Two 24th twin yarns are combined around a monofilament yarn of 150 denier) Yarn) Texture 2/1 Twill weave Density 39 threads / inch Weft 34 threads / inch

Conventional example warp polypropylene spun yarn 24s / 1 (24th count single yarn) weft polypropylene spun yarn 24s / 2 (24th count twin yarn) texture 2/1 twill weave density 50 warp / inch 47 weft / inch

In both the examples and conventional examples, one side was raised by wire raising and then heat setting was performed at 150 ° C. for 5 minutes at 5 m / min. Then, with the raised side as a table, driving belts were attached to both ends as shown in FIG. Table 1 shows the results of comparison, which was sewn as an endless belt and was attached to a Sekisui RF type dehydrator manufactured by Sekisui Environment Co., Ltd. shown in FIG. 3 for sludge treatment.

[0013]

[Table 1] Performance comparison between example and conventional example ○ Good, △ Somewhat difficult, × Bad

[0014]

[Effect of the Invention] The product of the present invention has a significantly increased breaking strength and durability. In addition, since it has an appropriate hardness, it is easy to perform sewing work, and even when it is used as a suction / dehydration belt, a uniform cake can be taken out without wrinkles or distortion. Further, the peeling of the cake was as good as the conventional product, and the effect of raising the hair was sufficient.

[Brief description of drawings]

1] -Conceptual diagram of compound yarn

FIG. 2 is a schematic view of an endless suction / dehydration belt with a drive belt attached. The symbol ⇔ is the weft direction

FIG. 3 is a conceptual diagram of a Sekisui RF dehydrator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Spun yarn 2 ... Monofilament yarn 3 ... Tension adjusting device 4 ... Driving belt 5 ... Application filter cloth 6 ... Suction dehydration belt 7 ... Suction dehydration unit

Claims (1)

(57) [Scope of utility model registration request] 1. A synthetic fiber span is used as a warp and is subjected to high tension.
Of synthetic fibers by spinning a spun yarn of engagement <br/> formed fibers under no tension around the monofilament yarns, of the spun yarns
The natural twist that occurs when the twist is released
A filter cloth for a suction dewatering belt of a water treatment dehydrator, characterized in that a composite thread in which a spun thread is softly wound around is constructed as a weft, and then one side is raised with a stirrup, wire, emery or the like to form a filter cloth. .