WO2012132426A1

WO2012132426A1 - Disk roll and substrate thereof

Info

Publication number: WO2012132426A1
Application number: PCT/JP2012/002147
Authority: WO
Inventors: 渡辺　和久; 中山　正章; 修堀内
Original assignee: ニチアス株式会社
Priority date: 2011-03-31
Filing date: 2012-03-28
Publication date: 2012-10-04
Also published as: TWI579247B; CN103476721A; KR20140031860A; JP2012211052A; KR101880906B1; JP5637915B2; TW201247564A

Abstract

Provided is a disk roll substrate containing 5 wt% or less of 45 µm or larger shot and comprising 20 to 38 wt% of alumina silicate fibers containing between 40 and 60 wt% of alumina and between 40 and 60 wt% of silica; 10 to 30 wt% of kibushi clay; 2 to 20 wt% of bentonite, and 20 to 40 wt% of mica.

Description

Disc roll and its base material

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

The plate glass is produced by continuously supplying a glass melt to the apparatus, flowing down from the apparatus in a strip shape, and cooling and curing the liquid while flowing. The disc roll functions as a pair of pulling rolls, and is used to sandwich the glass melt and forcibly feed it downward.

In general, a disc roll is a roll-like laminate in which a plurality of disc materials obtained by punching a millboard (plate-shaped molded body, base material) into a ring shape are inserted into a shaft serving as a rotating shaft, and flanges arranged at both ends are provided. The whole is pressed and fixed through. The outer peripheral surface of the disk material functions as a conveying surface for the glass melt.

Since the disc roll conveys the glass ribbon melt, it is required that the glass surface is not damaged along with heat resistance, flexibility, hardness, and a disc roll containing heat resistant inorganic fibers, mica, clay, etc. Known (Patent Documents 1 to 3).

Disc rolls are usually produced by suction dewatering molding or papermaking, depending on the drainage quality. The papermaking process is efficient because it can produce larger sheets, but it must have good drainage.

Special table 2010-510956 JP2009-132619A JP 2004-299980

However, inorganic fibers containing 70% by weight or more of high heat-resistant alumina as a raw material are expensive. Moreover, in order to manufacture efficiently, it was manufactured by the papermaking method and the drainage time at the time of draining from an aqueous slurry was calculated | required.
An object of the present invention is to provide a disc roll that can be efficiently manufactured without using expensive fibers and a base material thereof.

According to the present invention, the following inorganic fibers and the like are provided.
1. About 20 wt% to about 38 wt% of alumina silicate fiber containing about 40 wt% or more and about 60 wt% or less of alumina and about 40 wt% or more and about 60 wt% or less of silica with a shot of about 45 μm or more of about 5 wt% or less When,
Kibushi clay about 10 wt% to about 30 wt%,
About 2% to about 20% by weight of bentonite,
A disk roll substrate comprising about 20% to about 40% by weight of mica.
2. The base material for disk rolls according to 1, further comprising pulp and starch.
3. A coarse fiber containing about 40 wt% or more and about 60 wt% or less of alumina and silica of about 40 wt% or more and about 60 wt% or less is crushed to produce an alumina silicate fiber having a shot of about 45 μm or more and about 5 wt% or less. ,
Mixing water, the alumina silicate fiber, Kibushi clay, bentonite and mica to produce an aqueous slurry,
A method for producing a base material for a disk roll, in which a sheet is produced by pouring an aqueous slurry into a mold and filtering it.
4. A disc roll comprising the substrate according to 1 or 2 above.
5. Convey the glass melt using the disc roll described in 4,
A method for producing glass for cooling a glass melt.

According to the present invention, it is possible to provide a disc roll that can be efficiently manufactured without using expensive fibers and a base material thereof.

It is a figure which shows an example of the manufacturing method of glass using a disk roll.

The base material for disk roll of the present invention contains ceramic fiber (alumina silicate fiber), kibushi clay, bentonite and mica.

The ceramic fiber contains 20 to 38% by weight, preferably 25 to 38% by weight, more preferably 25 to 35% by weight. When the ceramic fiber is less than 20% by weight, the heat resistance is low, and when the ceramic fiber is more than 38% by weight, the amount of voids is increased, so that the wear resistance may be deteriorated.

The ceramic fiber used in the present invention contains 40 wt% or more and 60 wt% or less of alumina, preferably 45 wt% or more and 55 wt% or less. Further, the ceramic fiber contains 40% by weight to 60% by weight of silica, preferably 45% by weight to 55% by weight. 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.

The raw ceramic fiber usually contains unfibrinated material (shots), and the number of shots can be reduced by degreasing by a dry or wet method.

The ceramic fiber used in the present invention contains 5% by weight or less, preferably 2% by weight or less, of shots (unfibridized) of 45 μm or more. Disc rolls manufactured using fibers with many shots may damage the glass surface. The size of the shot is usually about 45 to 5000 μm.

The base material contains 10 to 30% by weight, preferably 15 to 25% by weight of Kibushi clay. When Kibushi clay is included in this range, the surface lubricity (smoothness) becomes good.

Bentonite is contained in an amount of 2 to 20% by weight, preferably 2 to 15% by weight, more preferably 3 to 15% by weight, and further preferably 5 to 15% by weight. If bentonite is not included, fixing and agglomeration are insufficient and drainage is deteriorated. Conversely, if there is too much bentonite, the properties of the slurry will be high and the drainage will be poor.

Mica is added to improve the followability of the disk material shaft to thermal expansion. Since the shaft into which the disk material is inserted is made of metal, when exposed to a high temperature, the shaft expands thermally and extends along the axial direction. At this time, since the disk material has a lower coefficient of thermal expansion than metal, the disk material cannot follow the elongation of the shaft, and the disk materials are separated from each other. On the other hand, mica has a very thin layer structure, and when heated, it undergoes a crystal transformation, but at that time, it tends to expand in the layer direction, and this expansion in the layer direction leads to thermal expansion of the shaft of the disk material. The follow-up performance increases.

As mica, white mica (mascobite; K ₂ Al ₄ (Si ₃ Al) ₂ O ₂₀ (OH) ₄ ), black mica, gold mica (progobite; K ₂ Mg ₆ (SiAl) ₂ O ₂₀ (OH) ₄ ), Paragonite, lepidonite, fluorine synthetic mica and the like can be used, but white mica is preferable in consideration of the above-mentioned followability.

The base material contains 20 to 40% by weight, preferably 25 to 35% by weight of mica. If mica is less than 20% by weight, the ability to follow the thermal expansion of the shaft will be low, and if it exceeds 40% by weight, it will be difficult to disperse uniformly in the slurry, and there is a concern that variations in physical properties of the disk base material will increase. Is done.

The base material of the present invention can contain an agglomeration aid and an organic binder in addition to the above components as long as the effects of the present invention are not impaired.

As the organic binder, organic fibers (pulp) and starch are preferable. When organic fibers (pulp) are included, compressive properties can be developed, and the amount can be, for example, 2 to 10% by weight, or 6 to 10% by weight. Further, when starch is contained, the strength of the disk material can be exhibited, and the amount can be, for example, 1 to 10% by weight, or 1 to 4% by weight.

The base material of the present invention can be 90% by weight or more, 95% by weight or more, 98% by weight or more, and 100% by weight of ceramic fiber, kibushi clay, bentonite and mica as inorganic components.

The base material of the present invention contains the above components in the above range, thereby obtaining a disc roll in which heat resistance and strength are maintained in a good balance even when the amount of inorganic fibers is small.

The base material can be manufactured by forming an aqueous slurry containing inorganic fibers, kaolinite and mica into a plate shape and drying it. At this time, it is efficient and preferable to use a papermaking method. That is, an aqueous slurry containing a predetermined amount of inorganic fiber, kaolinite and mica, if necessary, a coagulant aid, organic fiber, organic binder, etc. is prepared, and this aqueous slurry is formed into a plate shape by a paper machine and dried. Thus, a substrate can be obtained. The thickness of the substrate can be set as appropriate and is generally 2 to 10 mm.

Next, a method for manufacturing a disk roll will be described. Usually, a ring-shaped disc material is punched from a base material, and a plurality of the disc materials are inserted into a metal (for example, iron) shaft to form a roll-like laminate, and the whole from both ends via flanges arranged at both ends. Is fixed with a nut or the like with a slight compression applied to the disk material. Bake if necessary. And a disk roll is obtained by grinding the outer peripheral surface of a disk material so that it may become a predetermined roll diameter.
The structure of the disc roll includes a specification in which the entire shaft is covered with the disc material, a specification in which the shaft is covered with the disc material only in a portion where the glass contacts, a specification having a single shaft, etc. is there.

For example, as shown in FIG. 1, a glass roll 100 of the present invention is used to sandwich and convey a glass melt 100, and the glass melt 100 can be cooled and cured to produce glass.

Example 1
[Grease of coarse ceramic fiber]
Crude ceramic fibers containing 40 to 60% by weight of alumina and 60 to 40% by weight of silica (“Fineflex bulk fiber” manufactured by Nichias Corporation) were crushed to obtain ceramic fibers having a shot of 45 μm or more and 2% by weight or less.

The shot content was measured by the following procedure.
(I) A sample of 100 g or more is cut from an arbitrary position so that the shot does not fall off the sample.
(Ii) The cut sample is dried at 105 to 110 ° C. for 1 hour and then weighed to obtain W ₀ .
(Iii) Put the sample in a cylinder, press and pulverize at 21 MPa, use a spatula to loosen the sample in the cylinder, and then press and pulverize again.
(Iv) The ground 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 away with running water.
(V) The shot remaining on the sieve is dried together with the sieve for 1 hour using a dryer.
(Vi) After the sieve taken out of the dryer is cooled to room temperature, fine particles adhering to the back surface of the sieve are removed by hitting the side of the sieve for about 10 seconds by hand.
(Vii) Transfer the remaining shot on the sieve surface to a suitable container. In this case, it dropped enough to pay in the old brush so that the shot does not remain in the sieve, and weighed a shot separated W _1.
(Viii) The shot content is determined by the following formula and rounded to one decimal place. Shot _{_{content% = W 1 / W 0 ×}} 100

[Manufacture of disc roll base materials]
Prepare an aqueous slurry of 30% by weight of the granulated ceramic fiber, 32% by weight of white mica, 20% by weight of Kibushi clay, 10% by weight of bentonite, 6% by weight of pulp and 2% by weight of starch, and after drying by papermaking A paper roll base (millboard) having a size of 200 mm × 200 mm × 6 mm was made.
The obtained ceramic fiber-containing disk roll substrate was measured for density, and then evaluated according to the following (1) to (7). The results are shown in Table 1.

(1) Bending test of original sheet (bending strength and bending elastic modulus)
The ceramic fiber-containing disk roll substrate was held in a heating furnace maintained at 900 ° C. for 3 hours, and then naturally cooled to room temperature. A test piece having a width of 30 mm, a length of 150 mm, and a thickness of 6 mm was cut out from the cooled substrate, and the bending strength and the bending elastic modulus were evaluated according to JIS K7171 using “Autograph AG-100kND” manufactured by Shimadzu Corporation.

(2) Bending test during filling (bending strength and flexural modulus)
A disk material having a width of 30 mm and a length of 150 mm was cut out from the ceramic fiber-containing disk roll substrate, the disk material was sandwiched between stainless plates, and compressed so that the thickness was 10 mm and the density was 1.25 g / cm ³ . After being kept in a heating furnace maintained at 900 ° C. in a compressed state for 10 hours, it was naturally cooled to room temperature. After cooling, the sample released from the compressive force was used as a measurement sample, and the bending strength and bending elastic modulus were evaluated according to JIS K7171 using “Autograph AG-100kND” manufactured by Shimadzu Corporation.

(3) Thermal conductivity A disk material having a width of 50 mm and a length of 100 mm was cut out from the ceramic fiber-containing disk roll base material, and the disk material was sandwiched between SUS plates. The thickness was 10 mm and the density was 1.25 g / cm ³ . Compressed until it was, held in a heating furnace maintained at 900 ° C. for 10 hours, and then naturally cooled to room temperature. After cooling, the sample whose compression force is released is used as a measurement sample, and the surface of the sample is measured at room temperature by a rapid thermal conductivity meter QTM-500 (manufactured by Kyoto Electronics Industry Co., Ltd.) according to the unsteady hot wire method of JIS R2618. The thermal conductivity of was measured.

(4) Coefficient of thermal expansion A disk material having an outer diameter of 60 mm and an inner diameter of 20 mm is punched from the ceramic fiber-containing disk roll base material, roll-built so that the length is 100 mm and the density is 1.25 g / cm ³ on a stainless steel shaft. After being kept in a heating furnace maintained at 900 ° C. for 10 hours, it was naturally cooled to room temperature. The sample after cooling was cut into 5 × 5 × 20 mm and used as a measurement sample. Using a thermomechanical analyzer “TMA8310” manufactured by Rigaku Denki Kogyo Co., Ltd., the temperature was increased from room temperature to 900 ° C. in air at a rate of 5 ° C./min, and the thermal expansion coefficient was measured.

(5) Compression heating recovery rate A disk material having a width of 30 mm and a length of 50 mm is cut out from a ceramic fiber-containing disk roll base material, sandwiched between stainless plates, and compressed to a thickness of 20 mm and a density of 1.35 g / cm ^3. A fixed sample was used.
The obtained sample was heated at 600 ° C. for 5 hours, then cooled to room temperature 25 ° C., and the restored length when the compression force applied to the disk material was released was divided by the original length to obtain the restoration rate. It was. The obtained disk roll was heated at 900 ° C. for 10 hours, and the restoration rate was measured in the same manner as described above.

(6) Abrasion test A disk material having an outer diameter of 80 mm and an inner diameter of 30 mm is punched out from a ceramic fiber-containing disk roll base material, and a length of 100 mm and a packing density of 1.25 g / cm ³ are formed on a stainless steel shaft having a diameter of 30 mm. Roll build was performed to produce a disk roll.
This disc roll was rotated at 900 ° C. for 5 hours in a state where a stainless steel shaft having a diameter of 30 mm, which was subjected to 5 mm groove processing with a width of 2 mm at intervals of 2 mm, was cooled to a room temperature of 25 ° C. The depth of the groove formed on the roll surface of the disk roll was measured.

(7) Load deformation amount A disk material having an outer diameter of 60 mm and an inner diameter of 20 mm is punched from a ceramic fiber-containing disk roll base material, and a length of 100 mm and a packing density of 1.25 g / cm ³ are formed on a stainless steel shaft having a diameter of 20 m. Roll build was performed to produce a disk roll.
The disk roll was supported at both ends of the shaft by a gantry, and a load of 10 kgf / cm was applied to the roll surface made of the disk material by a compressor at 1 mm / min, and the load deformation amount (room temperature) at that time was measured.
Further, the disk roll was held in a heating furnace at 900 ° C. for 10 hours, taken out from the heating furnace, and then cooled to room temperature, the load deformation amount (900 ° C. for 10 hours) was measured in the same manner as described above.

From Table 1, it can be seen that the disk roll of the example has heat resistance, strength, wear resistance, and flexibility without using expensive fibers. Further, since the shot is small, the glass surface is hardly damaged.

Examples 2 to 4, Comparative Examples 1 and 2
In order to investigate the influence of bentonite, a disk roll substrate and a disk 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. For the bentonite amount of 30%, the roll physical properties were not measured because it was difficult to produce an original plate.

(1) Drainage Evaluation was performed based on the drainage time using a TAPPI type handmade papermaking machine.
○: Less than 100 seconds, Δ: 100 to 200 seconds, ×: 200 seconds or more

(2) Sheet appearance ○: Good, Δ: Uneven, ×: Cracked

(3) Heat shrinkage rate The substrate for disk roll was cut into a width of 30 mm and a length of 150 mm, heated at 900 ° C. for 3 hours, measured for the length in the linear direction and the thickness direction, and heated based on the following formula: Shrinkage was evaluated.
[(Measured value before heating−Measured value after heating) / Measured value before heating] × 100

The disc roll of the present invention can be used for production of plate glass, particularly glass for liquid crystal and glass for plasma display.
Although several embodiments and / or examples of the present invention have been described in detail above, those skilled in the art will appreciate that these exemplary embodiments and / or embodiments are substantially without departing from the novel teachings and advantages of the present invention. It is easy to make many changes to the embodiment. Accordingly, many of these modifications are within the scope of the present invention.
The entire contents of the documents described in this specification are incorporated herein by reference.

Claims

20 to 38% by weight of alumina silicate fiber containing 5% by weight or less of shots of 45 μm or more, 40% by weight to 60% by weight of alumina and 40% by weight to 60% by weight of silica;
Kibushi clay 10-30% by weight,
2-20% by weight of bentonite,
A base material for a disc roll containing 20 to 40% by weight of mica.
The disk roll substrate according to claim 1, further comprising pulp and starch.
A coarse fiber containing 40% by weight or more and 60% by weight or less of alumina and 40% by weight or more and 60% by weight or less of silica is granulated to produce an alumina silicate fiber having a shot of 45 μm or more and 5% by weight or less,
Mixing water, the alumina silicate fiber, Kibushi clay, bentonite and mica to produce an aqueous slurry,
A method for producing a base material for a disk roll, in which a sheet is produced by pouring an aqueous slurry into a mold and filtering it.
A disk roll comprising the base material according to claim 1 or 2.
The glass melt is conveyed using the disk roll according to claim 4,
A method for producing glass for cooling a glass melt.