JPH0753209B2 - Bag filter cloth - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bag filter cloth made of glass fiber.

[0002]

2. Description of the Related Art A bag filter is a heat-resistant cloth sewn into an elongated tubular shape and is used as a filter medium for removing or collecting dust from relatively hot dust-containing gas discharged from various factories. . In particular, a bag filter using glass fiber is excellent in heat resistance, durability and dust collection effect, for example, carbon black collection in the carbon black industry, kiln exhaust gas in the cement industry, clinker, dust from cooler exhaust gas. It is used in a wide range of fields such as the recovery and removal of waste gas, the removal of dust from the exhaust gas of electric furnaces and converters in the steel and steel industry, and the removal of dust from the exhaust gas of municipal waste incinerators.

The characteristics of the cloth used in such a bag filter are that the dust collection efficiency is high, that is, there is little dust leakage, the air permeability is high (gas pressure loss is small), and the strength of the cloth is high. It does not break with respect to ventilation pressure, the service life of the cloth is long,
For example, it is required to have high resistance to repeated bending that occurs during pulse backwashing.

FIG. 2 shows a manufacturing process of a conventional bag filter cloth made of glass fiber. That is, a conventional bag filter cloth is a glass monofilament that is spun, a starch-based binder is applied (sizing step), twisted and twisted to produce a glass yarn, and after weaving this glass yarn, Caramelize process to burn off starch-based binder,
It is manufactured by applying a resin such as a silicone resin or a tetrafluoroethylene resin on the surface of the cloth and heat-treating it. There is also known a product in which a part of the glass yarn is bulked (bulky processing), and the bulky yarn is used in combination with a filament yarn which is not bulked.

In the above, sizing with a starch-based binder is carried out in order to prevent yarn breakage and fluff generation in the lower twist, the upper twist and the weaving process. Further, the application of the resin to the surface of the glass cloth improves the corrosion resistance, wear resistance, lubricity, and dust releasability (dust removal effect), for example, H ₂ O, SOx, NOx, COx, H
It is made to prevent deterioration even when it comes into contact with high-temperature exhaust gas containing Cl or dust, and to improve durability.

[0006]

In the above conventional bag filter, since the starch-based binder is used in the sizing step, the adhesion rate of starch on the surface of the glass yarn is 1.0 to 1.0%.
It adheres at 2.0%. When a resin such as silicone resin or tetrafluoroethylene resin is directly applied to the cloth obtained by weaving this glass yarn, the adhesiveness between the glass fiber interface and the resin interface is not good and the resin is effectively applied. Can not do it. For this reason, the starch-based binder applied to the yarn surface is semi-baked (ignition loss of 0.2 at a temperature of 700 to 850 ° C for 20 to 60 seconds) that minimizes the deterioration of glass fiber.
It was necessary to apply the resin after carrying out the so-called caramelizing step of ~ 0.35%).

However, it has been found that when the above-mentioned caramelizing step is performed, the cross strength is lowered due to the heat history received at that time, and the durability of the bag filter is deteriorated. In addition, the caramelization process must be half-baked in order to minimize the deterioration of strength, and the starch remains in a state where it is not completely burned off, so that the adhesiveness of the resin cannot be said to be sufficient.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object thereof is to provide a bag filter cloth which prevents deterioration due to a caramelizing process, has improved strength, and has improved durability. To provide.

[0009]

In order to achieve the above object, the bag filter cloth of the present invention is obtained by weaving using a plastic size yarn and applying a resin without caramelization. Characterize. Here, the plastic size yarn means a yarn sized by a plastic binder and twisted, or a bulky yarn obtained by bulking the yarn.

The present invention will be described in more detail below with reference to preferred embodiments.

FIG. 1 shows an example of a manufacturing process for obtaining the bag filter cloth of the present invention. That is,
In the spinning step, the glass is drawn out from a platinum nozzle to form a filament, a plastic binder is applied (sizing) to the monofilament, and the filament is twisted and twisted to obtain a filament yarn. A bulky yarn is obtained by subjecting a part of this filament yarn to bulky processing (bulky processing). Then, the filament yarn and the bulky yarn are used together, and the bag filter cloth of the present invention is obtained by applying a resin to the surface of the filament yarn and heat-treating it without subjecting to a caramelizing step.

In the above, the diameter of the glass monofilament is preferably 3 to 8 μm, more preferably 5 to 7 μm. When the filament diameter exceeds 8 μm, the filament itself is hard, so the required folding endurance cannot be obtained even when sizing with a plastic binder, and when the filament diameter is less than 3 μm, the manufacturing cost becomes too high and it is not economical. . The yarn count is 11.2 to 3,000.
0 Tex is preferable, and 22.5 to 2,000 Tex is more preferable.

As the plastic binder, those containing a coupling agent, a binding agent and a lubricant are preferably used. More specifically, a binder having a composition shown in Table 1 below is used.

[0014]

[Table 1]

The adhesion rate of the binder when sizing with a plastic binder is 0.1 to 0 in terms of loss on ignition.
6%, preferably 0.2 to 0.4%.

As the resin applied to the surface of the glass cloth, graphite dispersion, silicone emulsion, tetrafluoroethylene resin dispersion,
Those containing at least one selected from polybutene emulsions are preferably used.

[0017]

In the present invention, since the plastic size yarn sized with the plastic binder is used as the material, when the surface of the obtained cloth is coated with resin such as silicone resin and tetrafluoroethylene resin, the glass fiber surface is sized. Even if the agent remains, the adhesiveness with the resin is not excluded. Rather, the coupling agent or the like contained in the plastic-based binder improves the adhesiveness between the glass fiber interface and the resin interface and can firmly bond the resin to the glass fiber surface.

As a result, it is not necessary to carry out the caramelizing step, the strength deterioration of the glass fiber due to the caramelizing step can be prevented, and the resin is firmly adhered to the surface of the glass fiber to prevent corrosion, abrasion resistance and lubrication. And dust releasability can be improved. Therefore, the strength and durability of the bag filter cloth can be increased, and the manufacturing process thereof can be simplified.

[0019]

【Example】

Examples 1 and 2 A bag filter cloth using a plastic size yarn was manufactured according to the process shown in FIG. As a plastic binder, 0.5 part by weight of epoxysilane,
Epoxy emulsion 4.0 parts by weight, cationic surfactant 0.3 parts by weight, water 95.2 parts by weight are used. The resin is silicone emulsion (solid content 35%) 3
Parts by weight, graphite dispersion (solid content 22%)
3 parts by weight, tetrafluoroethylene dispersion (solid content
(60%) 8 parts by weight and water 86 parts by weight were used. As warp yarns, filament yarns which are not subjected to the bulkiness processing of the count shown in Table 2 below are used, and as weft yarns, bulky yarns of the count shown in Table 2 are also used. Produced a variety of bag filter cloths.

Comparative Examples 1 and 2 According to the process shown in FIG. 2, a bag filter cloth using starch size yarn was manufactured. As the starch-based binder, 5.0 parts by weight of starch and 95.0 parts by weight of water are used.
By heating for 30 seconds. As the resin, the same resin as in Examples 1 and 2 was used, and the filament yarn and bulky yarn shown in Table 2 were used and twilled in the same manner as in Examples 1 and 2, and two types of bag filter cloths Was manufactured.

With respect to the bag filter cloths of Examples 1 and 2 and Comparative Examples 1 and 2 thus obtained, their mass (g / m ² ), tensile strength (kgf / 25 mm width), and folding endurance (times / 1)
Table 2 shows the results of measuring a 5 mm width load of 1 kg). In addition,
The tensile strength and the folding endurance were measured in each of the warp yarn direction and the weft yarn direction.

[0022]

[Table 2]

As is clear from the results shown in Table 2, the cloths of Examples 1 and 2 have the same weight and correspond to Comparative Examples 1 and 2.
It can be seen that the tensile strength is 1.5 times or more and the folding endurance strength is 2 times or more as compared with the No. Also, mass 410g
/ cross Example 1 m ² is found to have a cross equal to or higher tensile strength and folding endurance of Comparative Example 2 of the mass 530 g / m ^2. This means that, if the same mass, the life is about 1.5 times the increase in strength, if the same lifetime, the mass of the cloth, for example, from 530 g / m ² 410
It means that it can be reduced to g / m ² .

[0024]

As described above, according to the present invention,
By using the plastic size yarn, the caramelizing step can be omitted, thereby improving strength and providing a bag filter cloth having excellent durability. Moreover, since the caramelization process can be omitted, the manufacturing process is also simplified.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an example of a manufacturing process of a bag filter cloth of the present invention.

FIG. 2 is an explanatory diagram showing an example of a conventional manufacturing process of a bag filter cloth.

Claims (3)

[Claims] 1. A cloth for a bag filter, which is obtained by weaving using a plastic size yarn and applying a resin without caramelization. 2. The bag filter cloth according to claim 1, wherein the plastic size yarn is treated with a plastic binder containing a coupling agent, a binding agent, and a lubricant. 3. The resin containing at least one selected from a graphite dispersion, a silicone emulsion, a tetrafluoroethylene resin dispersion and a polybutene emulsion.
Cloth for bag filter described.