TWI551555B - Disk roll and base material thereof - Google Patents

Description

Disc roll and its substrate

The present invention relates to a disc roll and a substrate thereof suitable for use in the manufacture of flat glass.

The flat glass system continuously supplies the glass melt to the apparatus, and then flows out of the apparatus in a strip shape, and is manufactured by performing cooling by cooling in the outflow. The disc roll has a function of a pair of stretching rolls for holding and feeding the ribbon glass melt.

The disc roll is generally a disc sheet in which a billboard (plate-shaped formed body, base material) is punched into a ring shape, and a plurality of sheets are inserted into a shaft that is a rotating shaft to form a roll-like laminate. Then, the whole is pressurized by the flange provided at the two ends to be fixed. The outer peripheral surface of the disc sheet has a function of a conveying surface of the glass melt.

Since the disc roll conveys the ribbon-shaped glass melt, heat resistance and softness and hardness of the glass surface are not required to be damaged, and a disc roll containing heat-resistant inorganic fibers, mica or clay is known ( Patent Documents 1 to 3).

[Advanced technical literature] [Patent Literature]

Patent Document 1: Japanese Patent Special Table 2010-510956

Patent Document 2: Japanese Patent Special Open 2009-132619

Patent Document 3: Japanese Patent Laid-Open No. 2004-299980

However, mica has the potential to scratch the glass easily. Moreover, from the viewpoint of the diversity of raw materials and the possibility of substitution, it is expected that a disc roll can be produced without using mica as an essential component. Moreover, since it is manufactured by filtering water from an aqueous slurry, in order to manufacture efficiently, it is eager to shorten the drainage time.

It is an object of the present invention to provide a disc roll and a base material which do not have mica as an essential component.

According to the invention, the following substrate for a disk roll or the like is provided.

A substrate for a disc roll comprising: 25 to 50% by weight of ceramic fibers; 5 to 30% by weight of wood knot clay; 2 to 20% by weight of bentonite; and from alumina, ash stone and calcined kaolin The filler selected is 25~45% by weight.

2. The substrate for a disk roll according to the above aspect, wherein the ceramic fiber contains 40% by weight or more and 99% by weight or less of alumina, and 60% by weight or less and 1% by weight or more of cerium oxide.

3. The substrate for a disk roll according to the above aspect, wherein the ceramic fiber contains 70% by weight or more and 80% by weight or less of alumina, and 30% by weight or less and 20% by weight or more of cerium oxide.

4. The substrate for a disk roll according to any one of the items 1 to 3, wherein the filler is alumina.

The substrate for a disk roll according to any one of the items 1 to 3, wherein the filler is a limestone.

The substrate for a disk roll according to any one of the items 1 to 3, wherein the filler is a calcined kaolin.

The substrate for a disc roll according to any one of the items 1 to 6, further comprising a pulp and a starch.

8. The substrate for a disk roll according to 7, wherein the pulp contains 6 to 10% by weight.

9. The substrate for a disk roll according to 7 or 8, wherein the starch contains 1 to 4% by weight.

A disc roll comprising the substrate according to any one of items 1 to 9.

A method for producing a glass, wherein the glass melt is conveyed using the disc roll described in 10; The glass melt is cooled.

According to the present invention, it is possible to provide a disc roll which does not have mica as an essential component and a substrate thereof.

The substrate for a disc roll of the present invention contains: ceramic fiber (aluminum silicate fiber) Etc.), and fillers selected from wood knot clay, bentonite, and alumina, ash, cordierite, and calcined kaolin. It does not contain mica.

The base material contains 25 to 50% by weight, preferably 25 to 45% by weight, more preferably 30 to 40% by weight, based on the ceramic fiber. If the ceramic fiber is less than 25% by weight, heat resistance and thermal shock resistance are lowered. On the other hand, if the ceramic fiber exceeds 50% by weight, the bulk density of the disk material is lowered, resulting in a bulky volume, resulting in poor workability. The possibility.

The ceramic fiber used in the present invention usually contains 40% by weight or more and 99% by weight or less, preferably 40% by weight or more and 80% by weight or less, more preferably 70% by weight or more and 80% by weight or less or less. It is preferably 70% by weight or more and 75% by weight or less. Further, the ceramic fiber usually contains cerium oxide in an amount of 1% by weight or more and 60% by weight or less, preferably 20% by weight or more and 60% by weight or less, more preferably 20% by weight or more and 30% by weight or less, particularly preferably 25 parts by weight. The weight% or more and 30% by weight or less. If the alumina is increased, the heat resistance is increased. The fiber system may be used alone or in combination of two or more.

The substrate contains 5 to 30% by weight, preferably 5 to 25% by weight, more preferably 5 to 20% by weight of the wood knot clay. If the wood knot clay is contained within this range, the surface lubricity (smoothness) is good.

The bentonite system contains 2 to 20% by weight, preferably 2 to 15% by weight, more preferably 5 to 15% by weight. If it does not contain bentonite, it will be fixed. Insufficient cohesion leads to poor water filtration. On the other hand, if there is too much bentonite, the viscosity of the slurry will increase, and there is a possibility that the drainage water is deteriorated.

The present invention further contains alumina, ash, cordierite or calcined kaolin as a filler. The substrate of the present invention may contain two or more of these fillers.

The substrate contains 25 to 45% by weight of the filler, preferably 28 to 42% by weight. When the filler is less than 25% by weight, the surface smoothness (smoothness) of the assembled roller is lowered. On the other hand, if it exceeds 45% by weight, there is a punchability when the substrate is punched into a ring shape. Reduce the possibility.

The base material of the present invention may contain a coagulating aid or an organic binder in addition to the above components, within the range which does not impair the effects of the present invention.

The organic binder is preferably organic fiber (pulp) or starch. When the organic fiber (pulp) is contained, the compression property is exhibited, and the content thereof 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 sheet can be exhibited, and the content thereof can be, for example, 1 to 10% by weight or 1 to 4% by weight.

The base material of the present invention may be 90% by weight or more, 95% by weight or more, 98% by weight or more, 99% by weight or more, or 100% by weight, based on the total amount of the ceramic fiber, the kraft clay, the bentonite, and the filler.

The substrate of the present invention contains the above-mentioned components in the above range, and even if mica is not contained, a disc roll having a good balance of heat resistance, strength, and hardness can be obtained.

The substrate can be produced by a papermaking method or a dehydration molding method in which a slurry is supplied to one side of a molding die such as a gold mesh, and suction is performed from the other surface. Manufacturing. Specifically, an aqueous slurry containing a predetermined amount of ceramic fibers, kraft clay, bentonite, a filler, and optionally a cohesive aid, an organic binder, and the like is prepared, and the aqueous slurry is molded and dried. The substrate was obtained. The thickness can be set as appropriate, generally 2 to 30 mm.

Next, a method of manufacturing the relevant disc roll will be described. Usually, the annular disk sheet is punched out from the substrate, and the plurality of the disk sheets are inserted into a shaft made of metal (for example, iron) to form a roll-shaped laminate, which is disposed at the two ends. The flange is pressed against the entire end from both ends, and is fixed by a nut or the like while a certain compression is applied to the disc sheet. Calcination is carried out as needed. Then, the outer peripheral surface of the disc sheet is ground in a manner of a predetermined roll diameter to obtain a disc roll.

The structure of the disc roll includes a specification in which the entire shaft is covered by the disc, a specification in which the shaft contacting only the glass is covered by the disc, a specification having a single shaft, and the like.

As shown in Fig. 1, the glass roll 10 of the present invention is used to hold and transport the glass melt 100, and the glass melt 100 is cooled and hardened to produce glass.

[Examples] [Substrate for disc rolls containing various fillers] [Example 1]

Preparation: refractory inorganic fiber (containing yttrium oxide fiber containing 70% by weight or more of alumina and 30% by weight or less of cerium oxide) 30% by weight, oxidized An aqueous slurry of 32% by weight of aluminum, 20% by weight of kraft clay, 10% by weight of bentonite, 6% by weight of pulp, and 2% by weight of starch, and formed into a dried size of 200 mm × 200 mm by suction dehydration molding. ×6mm substrate for disc roll (book cover board).

After the density of the substrate for the obtained disc roll was measured, the following evaluations (1) to (8) were carried out. The results are shown in Table 1.

(1) Heat shrinkage rate

The substrate for the disc roll was cut into a width of 30 mm and a length of 150 mm, and after heating at 900 ° C for 3 hours, the length in the line direction and the thickness direction was measured, and the heat shrinkage ratio was evaluated according to the following formula. The heat shrinkage ratio in the relevant thickness direction may cause separation between the discs if the shrinkage is too large, so the smaller the better.

[(measured value before heating - measured value after heating) / measured value before heating] × 100

(2) Bending test of the original plate (bending strength and flexural modulus)

The substrate for the disc roll was kept in a heating furnace maintained at 900 ° C for 3 hours, and then naturally cooled to room temperature. The test piece having a width of 30 mm and a length of 150 mm was cut out from the substrate, and the "autograph AG-100kND" manufactured by Shimadzu Corporation was used, and the bending strength and the flexural modulus were evaluated in accordance with JIS K7171. If the bending elastic modulus is too large, the peeling resistance is lowered, so the smaller the better. .

(3) Bending test at filling (bending strength and flexural modulus)

A disk sheet having a width of 30 mm and a length of 150 mm was cut out from the substrate for the disk roll, and the disk was placed by a stainless steel plate, and compressed so as to have a thickness of 10 mm and a density of 1.35 g/cm ³ in a compressed state. After maintaining for 10 hours in a heating furnace maintained at 900 ° C, it was naturally cooled to room temperature. After cooling, the open compression force was used as a measurement sample, and "autograph AG-100kND" manufactured by Shimadzu Corporation was used, and the bending strength and the bending elastic modulus were evaluated in accordance with JIS K7171.

(4) Thermal conductivity

The substrate for the disk roll was cut out, and a disk having a width of 50 mm and a length of 100 mm was cut out, and the disk was placed by a SUS plate, and compressed so as to have a thickness of 10 mm and a density of 1.35 g/cm ³ . In the state of maintaining at 900 ° C for 10 hours, it was naturally cooled to room temperature. After cooling, the open compression force is used as a measurement sample, and the surface of the sample is used in accordance with the transient thermal metal wire method of JIS R2618, using a rapid thermal conductivity meter QTM-500 (manufactured by Kyoto Electronics Manufacturing Co., Ltd.). The thermal conductivity was measured in the middle of the temperature.

(5) Thermal expansion coefficient

A disk sheet having an outer diameter of 60 mm and an inner diameter of 20 mm was punched out from a substrate for a disc roll containing ceramic fibers, and a roll stack was formed on a stainless steel shaft so as to have a length of 100 mm and a density of 1.35 g/cm ³ . After maintaining for 10 hours in a heating furnace maintained at 900 ° C, it was naturally cooled to room temperature. The cooled sample was cut out to 5 × 5 × 20 mm and used as a measurement sample. Using a thermal mechanical analysis device "TMA8310" from Rigaku Electric Co., Ltd., the temperature was raised from room temperature to 900 ° C in air at a rate of 5 ° C / min, and the coefficient of thermal expansion was measured. The coefficient of thermal expansion is such that the tracking property against the shaft is increased, and therefore it is preferably large.

(6) Compression heating recovery rate

A disk sheet having a width of 30 mm and a length of 50 mm was cut out from a substrate for a disc roll containing ceramic fibers, and was compressed by a stainless steel plate so as to have a thickness of 20 mm and a density of 1.35 g/cm ³ , and then fixed. Set as a sample.

The obtained sample was heated at 600 ° C for 5 hours, and then cooled to room temperature of 25 ° C. The recovery rate was obtained by dividing the length restored by the compression force applied to the disk sheet by the original length. Further, the obtained disc roll was heated at 900 ° C for 10 hours, and the recovery rate was measured in the same manner as above. The compression heating recovery rate is good for tracking the thermal expansion of the shaft, and is preferably a large value.

(7) peeling resistance

A disk sheet having an outer diameter of 60 mm and an inner diameter of 20 mm was punched out from a substrate for a disk roll, and a roll was laminated on a stainless steel shaft having a diameter of 100 mm and a packing density of 1.35 g/cm ³ . Get a disc roll.

The disc roll was placed in an electric furnace maintained at 900 ° C, taken out after 15 hours, and quenched to room temperature 25 ° C. Then, this heating and quenching cycle is repeated until the disc roll is cracked or the disc is separated, and the number of cycles in which the crack or the disc is separated is counted. The more the number of cycles, the better the peeling resistance.

In addition to the above, the ShoreD hardness of the disc before the peeling resistance test was evaluated, and the disc sheet after the crack or after the separation of the disc (after the test) was hard. degree.

(8) Load deformation

A disk sheet having an outer diameter of 60 mm and an inner diameter of 20 mm was cut out from a substrate for a disk roll, and a roll stack was formed on a stainless steel shaft having a diameter of 20 mm so as to have a length of 100 mm and a packing density of 1.35 g/cm ³ . Layer, and make a disc roll.

The disc roller supports the two ends of the shaft by means of a gantry, and a load of 10 kgf/cm is applied to the roller surface composed of the disc by a pressing member at a distance of 1 mm/min, and the load deformation amount at this time is measured (room temperature) ).

Further, the disc 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, and the amount of load deformation (900 ° C, 10 hours) was measured in the same manner as above. Since the amount of load deformation is related to softness, it is preferably a large value.

[Examples 2, 3, Reference Example 1]

In place of the alumina, the calcined kaolin, the ash, and the cordierite were respectively used in the composition shown in Table 1, and the substrate for the disc roll which was subjected to suction dehydration molding was applied, and the same procedure as in Example 1 was carried out (1). ) ~ (8) evaluation of the physical properties. The results are shown in Table 1.

[Reference Example 2]

In place of alumina, the muscovite is used instead, and the refractory inorganic fiber is made of ceramic fiber (40 to 60% by weight of alumina and 60 to 40% by weight of cerium oxide), and papermaking is performed to form a dish having the composition shown in Table 1. The substrate for the sheet roll was evaluated in the same manner as in Example 1 except for the physical properties of (1) to (8). The results are shown in Table 1. Show. The base materials of Examples 1 to 3 and Reference Example 1 were found to have the same grade or superior characteristics as the base material of Reference Example 2 in terms of heat shrinkage of the original sheet and the like.

[Substrate for Disc Roller Containing Alumina] [Example 4-5]

With respect to the substrate for a disk roll of Example 1, the content of the inorganic fiber and the wood knot clay was changed and the physical properties were evaluated. Specifically, the substrate for a disk roll having the composition shown in Table 2 was formed by suction dehydration, and the physical properties of (1) to (8) were evaluated in the same manner as in Example 1. The results are shown in Table 2. Know that it contains The substrate of alumina is particularly excellent in the amount of load deformation.

[Substrate for disc roller containing asbestos] [Examples 6-8]

With respect to the substrate for a disk roll of Example 3, the contents of inorganic fibers, kraft clay, and pulp were changed and physical properties were evaluated. Specifically, the substrate for a disc roll having the composition shown in Table 3 was formed by suction dehydration, and the physical properties of (1) to (8) were evaluated in the same manner as in Example 1. The results are shown in Table 3.

(industrial availability)

The disc roll of the present invention can be used for the production of flat glass (especially glass for liquid crystal and glass for plasma display).

The embodiments and/or the embodiments of the present invention are described in detail above, but those skilled in the art can easily exemplify the exemplary embodiments and/or without departing from the novel disclosure and effect of the present invention. Various changes are added to the embodiment. Accordingly, various modifications are intended to be included within the scope of the invention.

The contents of the documents described in this specification are all incorporated in the present application.

10‧‧‧ disc roll

100‧‧‧ glass melt

Fig. 1 is a view showing an example of a method of manufacturing glass using a disk roll.

Claims (15)

A substrate for a disc roll comprising: 25 to 50% by weight of ceramic fibers; 5 to 30% by weight of wood knot clay; 5 to 20% by weight of bentonite; and selected from alumina, ash stone and calcined kaolin The filler is 25 to 45% by weight; and does not contain mica. The substrate for a disc roll according to the first aspect of the invention, wherein the ceramic fiber contains 40% by weight or more and 99% by weight or less of alumina, and 60% by weight or less and 1% by weight or more of cerium oxide. The substrate for a disc roll according to the second aspect of the invention, wherein the ceramic fiber contains 70% by weight or more and 80% by weight or less of alumina, and 30% by weight or less and 20% by weight or more of cerium oxide. The substrate for a disc roll according to any one of claims 1 to 3, wherein the filler is alumina. The substrate for a disc roll according to any one of claims 1 to 3, wherein the filler is a limestone. The substrate for a disc roll according to any one of claims 1 to 3, wherein the filler is calcined kaolin. The substrate for a disc roll according to any one of claims 1 to 3, further comprising a pulp and a starch. The substrate for a disc roll according to claim 7, wherein the pulp contains 6 to 10% by weight. The substrate for a disc roll according to claim 7, wherein the starch contains 1 to 4% by weight. A method for producing a substrate for a disc roll, wherein the aqueous slurry is prepared and dried; the aqueous slurry contains: 25 to 50% by weight of the ceramic fiber; and 5 to 30% by weight of the wood joint clay %; bentonite 5~20% by weight; and 25~45% by weight of filler selected from alumina, ash stone and calcined kaolin; and does not contain mica. A disc sheet comprising: 25 to 50% by weight of ceramic fibers; 5 to 30% by weight of wood knot clay; 5 to 20% by weight of bentonite; and a filler selected from alumina, ash stone and calcined kaolin 25~ 45% by weight; and does not contain mica. A method of producing a disk sheet, wherein the substrate for a disk roll according to any one of claims 1 to 9 is punched out of the annular disk sheet. A disc roll comprising a disc sheet of claim 11 of the patent application. A method of manufacturing a disc roll by inserting a disc sheet of the eleventh application of the patent application into a metal shaft to form a roll-like laminate, which is disposed at both ends of the roll-shaped laminate The flange is fixed in accordance with the state in which the two ends are pressurized. A method for producing a glass by using a disc roll of claim 13 to carry out the transfer of the glass melt; and cooling the glass melt.