JP3001479U - Flat tatami filter material - Google Patents

Abstract

(57) [Summary] [Structure] A filter material made of polyester fiber for use in a Hoffman filter device for removing solid foreign matter in cold rolling oil. Flat tatami weave filter material. [Effect] The occurrence rate of rolling flaws can be reduced without increasing the size of the filtration device.
Can be reduced by almost half.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a filter material for removing solid foreign matter in cold rolling oil.

[0002]

[Prior art]

 Solid foreign matter such as metal pieces may be mixed in the cold rolling oil during the rolling process. When such solid foreign matter (hereinafter simply referred to as foreign matter) is mixed in the cold rolling oil, it causes rolling defects on the surface of the rolled product. Therefore, in order to avoid the occurrence of rolling flaws, it is necessary to completely remove foreign matter having a particle size of 60 μ or more by filtration.

For this purpose, usually, a filtration device such as a Hoffman filter device is installed in the circulation circuit of the cold rolling oil to remove foreign matters in the cold rolling oil by filtration. ing. Here, the filter material conventionally used for the filter device is a filter material having a plain weave structure of polyester fiber.

As shown in the conventional example of FIG. 4 and FIG. 5, the plain weave design comprises warp yarns and weft yarns made of fibers having the same diameter, and the warp yarns and the weft yarns are alternately floated and set one by one while keeping a constant interval. It is a tissue filter material that is woven together. A plain weave design is the most basic weaving method, and a typical example is a "standard sieve" using metal wire, which is specified in "JIS Z8801" although the usage and wire diameter are different.

Naturally, with such a plain weave filter material, the particle size of the foreign matter that can be removed by filtration is determined by the size of the openings of the filter material, and a filter material with a small opening is used. By doing so, it becomes possible to filter even foreign matter having a smaller particle size. On the other hand, in order to reduce the mesh size, it is necessary to use fibers having a smaller diameter, and as a result, the strength of the filter material is significantly reduced. Therefore, with a device of the same size, the processing flow rate will drop significantly.

[0006]

[Problems to be solved by the device]

 The present invention has been made in order to solve the above-mentioned problems of the prior art, and achieves an opening of 60 to 70 μm while ensuring a required processing flow rate of cold rolling oil. It is an object of the present invention to provide a filter material for removing foreign matter in cold rolling oil that can be processed.

[0007]

[Means for Solving the Problems]

 The present invention is a filter material for removing solid foreign matter in cold rolling oil, which is characterized in that it has a flat-woven weave design with warp threads and weft threads having different diameters.

[0008]

[Action]

 A typical example of a flat tatami weave structure is the structure of the tatami mat itself, in which the weft threads are arranged in contact with each other, and the weft threads alternate up and down, but the warp threads are straight and do not float. is there. (See FIGS. 1, 2 and 3) In addition, as is commonly seen in the case of tatami mats, warp and weft yarns often have different diameters.

[0009] Table 1 shows the mesh, wire diameter (mm) and mesh size (μm) of the plain weave filter material used in the examples of the present invention and the conventional plain weave filter material. It is shown together. As is clear from Table 1, when compared with the case of the same mesh size, the warp yarn can use a wire diameter of 3 to 5 times that of the conventional plain weave, and the weft yarn can use a wire diameter of 2 to 3 times. Therefore, the strength of the filter material is significantly improved, and it is possible to achieve the opening of 60 to 70 μm while securing the necessary filtration flow rate.

[0010]

[Table 1]

[0011]

【Example】

 FIG. 1 is a plan view of a plain weave design of an embodiment, FIG. 2 is a longitudinal side view thereof, and FIG. 3 is an enlarged perspective view of an intersecting portion of warp and weft of a plain weave weave. 1 and 2 indicate warp and weft, respectively. Since the structure is as shown in FIGS. 1 to 3, it is possible to increase the wire diameter and reduce the mesh opening.

Next, the filter material having the flat tatami weave structure was attached to a filter device to carry out a filter test. In practice, the plain weave filter material was replaced with a plain weave filter material on June 15, and two types of cold rolling oil (A cycle and B cycle) were used depending on the steel type. In each case, the filter material is made of polyester fiber. As the filter material for the flat-woven fabric of the embodiment, a filter material having a wire diameter of 0.1 × 0.15 mm and an opening of 68 μm is used. As the material, the results are obtained when a filter material having a wire diameter of 0.055 mm and an opening of 86 μm is used.

The filtration device used is a Hoffman filter device with a processing flow rate of 9 m ³ / min. FIG. 6 shows the occurrence rate of rolling flaws (monthly average value) when the plain weave filter material of the conventional example was changed to the plain weave design filter material of the present invention (example). The figure shows 100% when the filter material is used (conventional example).

As is clear from FIG. 6, the occurrence rate of rolling flaws could be reduced to almost half without causing a reduction in the processing flow rate.

[0015]

[Effect of device]

 By using the flat weave filter material according to the present invention, the rate of occurrence of rolling flaws can be reduced to almost half that of the plain weave filter material without increasing the size of the filtering device. Is possible.

[Brief description of drawings]

FIG. 1 is a plan view of a plain weave structure of an example.

FIG. 2 is a vertical cross-sectional side view of the flat-woven weave design of the example.

FIG. 3 is an enlarged perspective view of an intersecting portion of the flat weave structure of the example.

FIG. 4 is a plan view of a plain weave design of a conventional example.

FIG. 5 is a longitudinal sectional side view of a plain weave design of a conventional example.

[Fig. 6] Fig. 6 is a diagram showing a change in rolling defect occurrence rate (monthly average value) between a plain weave filter material according to the present invention and a conventional plain weave filter material.

[Explanation of symbols]

 1 warp yarn 2 weft yarn

Claims (1)

[Scope of utility model registration request] 1. A filter cloth for removing solid foreign matter in cold rolling oil, wherein the filter cloth has a flat weave structure having warp yarns and weft yarns of different diameters.