KR20140031860A - Disk roll and substrate thereof - Google Patents

Abstract

20 to 38% by weight of alumina silicate fibers, including 40% to 60% by weight of alumina, and 40% to 60% by weight of silica, and 10 to 30% by weight of clay at the base, Base material for disc rolls containing 2 to 20 wt% knight and 20 to 40 wt% mica.

Description

Disc rolls and their base materials {DISK ROLL AND SUBSTRATE THEREOF}

The present invention relates to a disc roll suitable for the production of sheet glass and a base material thereof.

Plate glass is produced by continuously supplying a glass melt to a device, causing it to flow in a strip in the device, and cooling and curing while flowing. The disc rolls function as a pair of tension rolls and are used to sandwich the strip-shaped glass melt and forcibly push it downward.

Disc rolls are generally roll-shaped laminates by inserting a disc material punched into a ring shape of a mill board (plate-shaped molded body, base material) into several shafts of rotational axis, and the whole through a flange arranged at both ends. It is fixed by pressing. The outer circumferential surface of the disk material functions as the transport surface of the glass melt.

Since the disc roll conveys a strip-shaped glass melt, a disc roll containing heat resistant inorganic fibers, mica, clay, etc. is known so as not to damage the glass surface with heat resistance, flexibility, and hardness (Patent Documents 1 to 3). ).

Disk rolls are generally produced by suction dewatering molding or paper knitting, depending on whether the water filterability is good or bad. In the papermaking method, a larger sheet can be produced, so the efficiency is good, but the water filterability should be good.

1. Japanese Patent Application No. 2010-510956 2. Japanese Patent Publication No. 2009-132619 3. Japanese Patent Laid-Open No. 2004-299980

However, inorganic fibers containing 70% by weight or more of high heat-resistant alumina as a raw material were expensive. In addition, in order to manufacture efficiently, it can manufacture by the paper-floating method, and the thing of the short time of the filtrate at the time of filtrating with an aqueous slurry was calculated | required.

It is an object of the present invention to provide a disk roll and its base material which can be produced efficiently without using expensive fibers.

According to the present invention, the following inorganic fibers and the like are provided.

1. About 20% to about 38% by weight of alumina silicate fibers containing about 40% by weight or more and about 60% by weight or less of about 40% by weight or less and about 40% by weight or less of alumina having a short length of about 45 μm or less. %Wow

At the time of donation, about 10 wt%-about 30 wt% of clay (purpose clay)

About 2% to 20% by weight of vent knight

Base material for disc rolls containing about 20% to about 40% by weight of mica.

2. In addition, the base material for the disc roll described in 1, including pulp and starch.

3. Grind the coarse fiber containing about 40% by weight to about 60% by weight of alumina and about 40% by weight to about 60% by weight of silica to prepare alumina silicate fibers having a short length of about 45 μm and about 5% by weight.

An aqueous slurry was prepared by mixing water, the alumina silicate fiber, clay at the base, bent knight, and mica.

The manufacturing method of the base material for disk rolls which manufactures a sheet | seat by putting an aqueous slurry into a mold and giving it.

4. A disc roll containing the base material described in 1 or 2.

5. The manufacturing method of the glass which conveys a glass melt using the disk roll of 4, and cools a glass melt.

According to the present invention, it is possible to provide a disk roll and its base material which can be efficiently produced without using expensive fibers.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows an example of the glass manufacturing method using a disk roll.

Base materials for disc rolls of this invention include ceramic fibers (alumina silicate fibers), clay on base, bent knight and mica.

The ceramic fiber contains 20 to 38% by weight, preferably 25 to 38% by weight, more preferably 25 to 35% by weight. If the ceramic fiber is less than 20% by weight, the heat resistance is low, and if the ceramic fiber is more than 38% by weight, the amount of voids is increased, which may deteriorate wear resistance.

The ceramic fiber used for this invention contains 40 weight% or more and 60 weight% or less of alumina, Preferably it contains 45 weight% or more and 55 weight% or less. In addition, the ceramic fiber contains 40% by weight or more and 60% by weight or less of silica, preferably 45% by weight or more and 55% by weight or less. You may use a fiber 1 type or in mixture of 2 or more types.

The average fiber diameter of ceramic fibers is usually about 2 to 5 μm.

Ceramic fibers as raw materials usually contain microfibers (shorts) and can be shortened by pulverizing (or dropping particles) by a dry or wet method.

The ceramic fiber used in the present invention contains only 45 μm or more of short (unfiber) 5% by weight or less, preferably 2% by weight or less. Disc rolls produced using short-shot fibers may damage the glass surface. The size of a shot is about 45-5000 micrometers normally.

The base material comprises 10-30 wt%, preferably 15-25 wt%, clay at the base. The inclusion of clay in this range at the base provides good surface lubricity (smoothness).

The bentite contains 2 to 20% by weight, preferably 2 to 15% by weight, more preferably 3 to 15% by weight, still more preferably 5 to 15% by weight. If no bentite is included, fixation and flocculation are insufficient, resulting in poor freeness. On the contrary, when too much bentite is used, the slurry property is increased, and the freeness is deteriorated.

Mica is added to increase the followability to the thermal expansion of the shaft of the disk material. Since the shaft into which the disk member is inserted is made of metal, when the shaft is exposed to high temperature, the shaft expands and extends along the axial direction. At this time, the disk material has a lower coefficient of thermal expansion compared to the metal, so that the disk material does not follow the elongation of the shaft, and the disk materials are peeled off. On the other hand, mica has a very thin layer structure, and when heated, it causes crystal transformation, but it tends to expand in the layer direction at that time, and the expansion in this layer direction increases the followability to the thermal expansion of the shaft of the disk material. .

As mica, white mica (Mascobyte; K ₂ Al ₄ (Si ₃ Al) ₂ O ₂₀ (OH) ₄ ), black mica, gold mica (Progobit; K ₂ Mg ₆ (SiAl) ₂ O ₂₀ (OH) ₄ ), paragonite, rapid night, fluorine synthesized mica and the like can be used, but in view of the following traceability, back mica is preferred.

The base material includes 20 to 40% by weight of mica, preferably 25 to 35% by weight. If the mica is less than 20% by weight, the trackability to the thermal expansion of the shaft is lowered, if it is 40% by weight or more, it is difficult to evenly disperse in the slurry, and there is a concern that the physical properties of the disc base material become large.

The base material of the present invention may include a coagulant aid and an organic binder in addition to the above components within the scope of not losing the effects of the present invention.

As an organic binder, organic fiber (pulp) and starch are preferable. When the organic fiber (pulp) is included, the compressive properties are expressed, and the amount thereof can be, for example, 2 to 10% by weight or 6 to 10% by weight. When starch is included, the strength of the disk material is expressed, and the amount thereof may be, for example, 1 to 10% by weight or 1 to 4% by weight.

The base material of the present invention, as an inorganic component, may be 90% by weight, 95% by weight, 98% by weight or 100% by weight of ceramic fibers, base clay, bent knight, and mica combined.

The base material of the present invention includes the above components in the above ranges, whereby a disc roll in which the amount of inorganic fibers is maintained at least in balance of heat resistance and strength can be obtained.

The base material may be prepared by molding and drying an aqueous slurry including inorganic fibers, kaolinite and mica in a plate shape. At this time, it is efficient and preferable to use paper knitting. That is, by preparing an aqueous slurry containing a predetermined amount of inorganic fibers, kaolinite and mica, a coagulant aid, an organic fiber, an organic binder, and the like, and forming the aqueous slurry in a plate shape with a paper-floating machine and drying it, You can get the material. In addition, the thickness of a base material can be set suitably, and 2-10 mm is common.

Next, the manufacturing method of a disk roll is demonstrated. Generally, a ring-shaped disk material is punched out of the base material, and the disk material is inserted into a plurality of pieces of metal (for example, iron) shafts to form a roll-shaped stack, and both ends are provided through flanges disposed at both ends. Press the whole and fix it with a nut or the like while applying some compression to the disk material. It is baked if necessary. And a disk roll can be obtained by grinding the outer peripheral surface of a disk material so that it may become a predetermined roll diameter.

The structure of a disc roll includes the thing of the specification in which the whole shaft is covered with the disc material, the thing of the specification in which the shaft is covered with the disc material only in the part which glass contacts, etc., the specification of a single shaft.

For example, as shown in FIG. 1, using the disk roll 10 of this invention, the glass melt 100 is clamped and conveyed, and the glass melt 100 can be hardened | cured, and glass can be manufactured.

[Example 1]

[Pulverization of Crude Ceramic Fiber]

The crude ceramic fibers ("Fine Flex Bulk Fiber" manufactured by Nichias Inc.) containing 40 to 60% by weight of alumina and 60 to 40% by weight of silica were pulverized to obtain ceramic fibers having a short length of 45 µm or more and 2% by weight or less.

The content rate of the shot was measured in the following order.

(i) A sample of 100 g or more in any part is cut off so that the shot does not fall out of the sample.

(ii) The cut sample is dried at 105 to 110 ° C. for 1 hour, and then weighed to obtain W ₀ .

(iii) The sample is placed in a cylinder and pressure-pulverized at 21 MPa, and the sample using a spatula is released from the cylinder and pressure-pulverized again.

(iv) The pulverized sample is transferred to a sieve having a preliminary size of 45 μm of JIS-Z-8801, and the fibers and fine shots are washed with running water.

(v) The remaining shot in the sieve is dried with a sieve for 1 hour using a dryer.

(vi) After cooling the sieve removed from the dryer to room temperature, remove the fine particles attached to the back of the sieve by tapping the side of the sieve by hand for about 10 seconds.

(vii) The shot remaining on the face of the sieve is transferred to a suitable container. At this time, the shot is shaken off sufficiently with a sieve brush so that the shot does not remain in the sieve, and the separated shot is weighed to be W ₁ .

(viii) The content of short is determined by the following formula and rounded to one decimal place. Short content% = W ₁ / W ₀ × 100

[Manufacture of Disc Roll Base Material]

30% by weight of the ceramic fiber pulverized, 32% by weight of mica, 20% by weight of clay at the base, 10% by weight of bentite, 6% by weight of pulp, and 2% by weight of starch were prepared and dried by papermaking. The base material (mill board) for the disc roll of the subsequent dimension of 200 mm x 200 mm x 6 mm was paper-knitted.

The density | concentration was measured about the obtained base material for ceramic fiber containing disc rolls, and the following (1)-(7) was evaluated. The results are shown in Table 1.

(1) Bending test of disc (bending strength and bending elastic modulus)

The base material for the ceramic fiber-containing disk roll was held in a heating furnace kept at 900 ° C for 3 hours, and then naturally cooled to room temperature. The test piece of width 30mm, length 150mm, and thickness 6mm was cut out from the base material after cooling, and bending strength and bending elastic modulus were evaluated according to JIS K7171 using Shimadzu Corporation "Autograph AG-100kND".

(2) Bending test during filling (bending strength and bending elastic modulus)

Cut 30 mm wide and 150 mm long discs from the base material for ceramic fiber-containing disc rolls, and sandwich the discs with a stainless plate, compress them to a thickness of 10 mm and a density of 1.25 g / cm ³ , and then compress them to 900 ° C. After holding for 10 hours in a maintained heating furnace, the mixture was naturally cooled to room temperature. The compression force after cooling was measured and used as a sample, and the bending strength and the bending elastic modulus were evaluated according to JIS K7171 using "Autograph AG-100kND" by Shimadzu Corporation.

(3) Thermal conductivity

Cut the disk material of width 50mm and length 100mm from the base material for ceramic fiber-containing disk roll and sandwich the disk material with SUS plate, compress it until it is 10mm thick and the density is 1.25g / cm ³ , and in the compressed state After holding for 10 hours in a heating furnace maintained at 900 ℃, it was naturally cooled to room temperature. What opened the compressive force after cooling was made into the measurement sample, and the thermal conductivity in room temperature was measured with the rapid thermal conductivity meter QTM-500 (made by Kyoto Electronics Industry Co., Ltd.) according to the abnormal heating method of JISR2618.

(4) thermal expansion coefficient

Punch a disc material with an outer diameter of 60 mm and an inner diameter of 20 mm from a base material for ceramic fiber-containing disk rolls, roll build a stainless steel shaft to a length of 100 mm and a density of 1.25 g / cm ³ , and hold it for 10 hours in a heating furnace maintained at 900 ° C. After that, the mixture was naturally cooled to room temperature. The sample after cooling was cut out into 5x5x20 mm, and it was set as the sample. The thermal expansion coefficient was measured by raising temperature from room temperature to 900 degreeC in the air at the speed | rate of 5 degreeC / min using the thermomechanical analyzer "TMA8310" by Rigaku Electric Industry Co., Ltd.

(5) compression heating recovery rate

The disk material of width 30mm and length 50mm was cut out from the base material for ceramic fiber containing disk rolls, it pinched by the stainless plate, and it compressed and fixed so that it might be set to thickness 20mm and density 1.35 g / cm <^3> as a sample.

The sample obtained was heated at 600 ° C. for 5 hours, then cooled to room temperature 25 ° C., and the recovered length when the compression force applied to the disc material was released was divided by the original length to obtain a recovery rate. Furthermore, the disk roll obtained was heated at 900 degreeC for 10 hours, and the recovery rate was measured similarly to the above.

(6) abrasion test

A disk material having an outer diameter of 80 mm and an inner diameter of 30 mm was punched out from the base material for ceramic fiber-containing disk rolls, and roll rolls were made on a stainless steel shaft having a diameter of 30 mm so as to have a length of 100 mm and a packing density of 1.25 g / cm ³ .

The disk roll was rotated at 900 ° C. for 5 hours while contacting the roll surface of the disk roll with a stainless steel shaft having a diameter of 30 mm made of 5 mm wide grooves at 2 mm intervals, and then cooled to room temperature 25 ° C. to roll the disk roll. The depth of the grooves formed on the surface was measured.

(7) load deformation

A disk material having an outer diameter of 60 mm and an inner diameter of 20 mm was punched out from the base material for ceramic fiber-containing disk rolls, and roll rolls were formed on a stainless steel shaft having a diameter of 20 m so as to have a length of 100 mm and a packing density of 1.25 g / cm ³ .

The disk roll was supported by both ends of the shaft as it was, and a load of 10 kgf / cm was applied at 1 mm / min by a compress to the roll surface made of disk material, and the amount of load deformation (room temperature) at that time was measured.

In addition, the disk roll was held in a heating furnace at 900 ° C. for 10 hours, taken out of the heating furnace, and the load deformation amount (900 ° C. for 10 hours) was also measured in the same manner as above for the cooling to room temperature.

It can be seen from Table 1 that the disk roll of the example has heat resistance, strength, wear resistance, and flexibility without using expensive fibers. Moreover, since there are few shorts, there is little damage to a glass surface.

Examples 2-4, Comparative Examples 1,2

In order to examine the influence of bentite, the disc roll base material and the disc roll were produced and evaluated in the same manner as in Example 1 except that the composition shown in Table 2 was used. The results are shown in Table 2. The roll physical properties were not measured for 30% of the bent nitrite because it was difficult to fabricate the original plate.

(1) Yeosu

The TAPPI-type hand was used to evaluate the free time by a paper floater.

○: less than 100 seconds, △: 100 to 200 seconds, X: 200 seconds or more

(2) sheet appearance

○: good, △: uneven part x: crack

(3) heating shrinkage

The base material for a disk roll was cut out to 30 mm in width and 150 mm in length, and it heated at 900 degreeC for 3 hours, and measured the length of the linear direction and the thickness direction, and evaluated the heat shrinkage rate according to following Formula.

(Measured value before heating-measured value after heating) / measured value before / heating * 100

The disk roll of this invention can be used for manufacture of plate glass, especially the glass for liquid crystals, or the glass for plasma displays.

Although the embodiments and / or examples of the present invention have been described in some detail, those skilled in the art can readily make many changes to these exemplary embodiments and / or examples without departing substantially from the mycological teachings and effects of the present invention. Therefore, many of these modifications are included within the scope of the present invention.

The contents of the document described in this specification are all incorporated herein by reference.

Claims (5)

20 to 38% by weight of alumina silicate fibers containing at least 5% by weight and 45% or more of alumina comprising at least 40% by weight and 60% by weight of silica and at least 60% by weight of silica.
10-30% by weight of clay at the time of donation
With 2-20% by weight of vent knight
Base material for disc roll containing 20-40% by weight of mica.
The base material of claim 1 further comprising pulp and starch.
Crude fibers comprising at least 40% by weight of alumina and at most 60% by weight of silica and at least 60% by weight of silica are prepared to produce alumina silicate fibers of at least 5% by weight of 45 μm or more of short, and the water, the alumina silicate fibers and the base A method for producing a base material for a disc roll, in which a sheet is produced by mixing sea clay, bentite, and mica to produce an aqueous slurry, and pouring the aqueous slurry into a mold and subjecting it to water.
A disk roll comprising the base material according to claim 1.
The manufacturing method of the glass which conveys a glass melt using the disk roll of Claim 4, and cools a glass melt.

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