JP2568845B2 - Roll for transporting glass - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention is used for rolls used for transporting a material to be heat-treated in the glass industry, for example, a sheet glass layer furnace, a tempered glass heat treatment furnace, and the like. It relates to a glass transport roll.

(Prior Art) Generally, in a glass transporting roll, a heat-resistant roll is disposed at right angles to a traveling direction of a material to be heat-treated in a heat treatment furnace for various sheet glasses.

The heat-resistant rolls are juxtaposed in the furnace or outside the furnace. In particular, the heat-resistant rolls juxtaposed in the furnace are required to have heat resistance, wear resistance, and smoothness.

Conventionally, as this type of roll, a metal roll, an asbestos roll, a carbon roll, and the like are often used.

Generally, high heat-resistant Cr steel or Ni steel is selected for the metal roll used for the glass transport roll.However, since the roll itself is very hard, foreign matter is caught between the roll and the product. At the time of use, the product was damaged, the product was cracked, and when used at a high temperature, a metal oxide film appeared on the roll surface, and the oxide film was fused with the glass, which was not good.

Also, taking advantage of the characteristics of natural asbestos, cutting a molded sheet using a rubber-like binder into a so-called donut-shaped annular body, compressing and laminating a plurality of these annular bodies, and then finishing the surface. To form a heat-resistant roll for use.

However, this heat-resistant asbestos used to form a roll, SiO ₂ 37 to 42% by weight, containing 14 wt% of other H ₂ O containing MgO 39 to 42% by weight, and when used in 600 ° C. or higher However, H ₂ O molecules are detached from the structure, and the fiber strength is significantly deteriorated. Therefore, the heat-resistant roll formed using such asbestos has a drawback that when used as a transport roll for heat treatment of various glasses exposed to high temperatures, the roll surface is significantly worn and the life of the roll is short. I was

On the other hand, according to Japanese Patent Publication No. 58-58415, a large number of asbestos joint sheets are inserted, high-pressure press-molded to form a sleeve, and the sleeve is tightened from both ends and fixed to a roll iron core. A roll excellent in heat resistance and abrasion resistance sintered at 500500 ° C. is disclosed.

In addition, a carbon roll in which sleeve-shaped carbon is inserted into a metal shaft has excellent surface smoothness and face-to-face aggression, but it is weak against thermal shock and may chip or crack when used at high temperatures. There was a drawback of falling off.

By the way, the applicant of the present invention has previously disclosed in Japanese Patent Application No. 59-253092, a raw material comprising an aluminosilicate amorphous fiber, an inorganic filler, an organic binder and a sintering aid having a bulk specific gravity of 0.5 g.
There is proposed an application relating to a high heat-resistant roll in which a so-called donut-shaped annular sheet molded and processed so as to have a diameter of / cm ³ or more is fitted and fixed to a metal shaft.

Further, the roll of the application is impregnated and impregnated with an inorganic colloid solution over the entire roll, further improving the sinterability and improving the abrasion resistance of the roll with Japanese Patent Application No. 61-258781,
It is specified.

(Problems to be Solved by the Invention) In the conventional metal roll, the surface hardness is too hard, so that the product may be damaged, the product may be broken, or the surface of the metal roll may be damaged due to the adhesion of foreign matter. The resulting metal oxide coating has the disadvantage of fusing to the product.

The heat-resistant roll obtained by the invention of Japanese Patent Publication No. 58-58415 has a high density, and it is possible to reduce the wear of the roll to increase the density of the cylindrical body. Because of the assembling, the fibers in the sheet were broken, and cracks were formed in the shaft direction when the roll was heated, and the sheets fell off.

Further, in a carbon roll, a metal shaft is cracked or dropped due to a difference in coefficient of thermal expansion of a carbon sleeve.

On the other hand, in the roll obtained by the invention proposed in Japanese Patent Application No. 59-253092, an aluminosilicate amorphous fiber and an inorganic filler are sintered by a sintering aid (viscosity) and bonded together.
Although the abrasion resistance is improved, there is a disadvantage that the abrasion of the roll proceeds until the roll is sufficiently heated and sintered.

Furthermore, since the roll has a fiber as its main component thicker than asbestos and a large variation in fiber diameter, a fine uneven pattern is formed on the roll surface, and the pattern is conveyed by the roll. There was a drawback that it was transferred to glass or the like and was not suitable as a glass transport roll.

On the other hand, according to Japanese Patent Application No. 61-258781, an inorganic colloid solution is impregnated and impregnated into a roll mainly composed of an aluminosilicate amorphous as a raw material in an amount of 7 to 50 g / m ^{2 in} terms of solid content to obtain smoothness and baking. Although rolls with improved binding properties have been proposed, the impregnation amount is determined by joint opening due to sintering shrinkage, and has the drawback of being vulnerable to thermal shock because it is applied to the entire roll. doing.

In view of these circumstances, an object of the present invention is to improve abrasion resistance, surface smoothness, and thermal shock resistance of a roll for glass transport using aluminosilicate fiber as a main raw material.

(Means for Solving the Problems) In order to achieve this object, in the heat-resistant roll according to the present invention, a roll surface of a disc roll mainly made of aluminosilicate fiber having a shot content of 30% or less, The thickness T of the impregnated layer impregnated with the inorganic colloid solution is 1 mm ≦ the thickness T of the impregnated layer ≦ 0.5 (R ₁ −R ₂ ) / 2 (I) R ₁ : Roll outer diameter (mm) R ₂ : Metal shaft outer diameter (Mm) Impregnated and dried so as to satisfy the formula (I).

Further, the roll has a double roll structure in the ceramic portion, and the inorganic colloid solution of the surface layer forms a strong dry gel solid layer to improve smoothness and sinterability. In addition, since the inorganic colloid solution does not penetrate into the inside, the flexibility of the fiber remains, and it functions as a cushion material for relaxing stress due to the heat shrinkage of the shaft and the roll, thereby improving thermal shock resistance.

The glass transport roll requires the surface smoothness of the roll. This is because it is necessary to remove coarse particles (especially 150 μm or more) because the irregularities on the surface of the roll are transferred directly to the glass. That is, shots (granules) are removed from the aluminosilicate fiber by a wet method. When the shot content exceeds 30%, 150 μm is contained in the fiber.
m or more shots are included, which is not preferable as a raw material for a disc roll requiring the surface smoothness of the roll. In addition, removing shots finer than necessary also removes fibers having a large fiber diameter, resulting in poor fiber yield and high cost. Therefore, shots having a shot content of 10 to 20 wt% and a shot of 150 μm or more are preferably Is preferred.

(Effect of the Invention) In the heat-resistant roll according to the present invention as described above, the impregnated and impregnated inorganic colloid solution is formed on the disc roll constituting the roll so as to form the impregnated layer represented by the formula (I).
By drying, the roll has a double roll structure, so the surface layer is reinforced to maintain the smoothness required for glass transport, and the wear resistance is also improved. Furthermore, even in a place where temperature conditions are severe, such as layer conveyance, the roll inner layer functions as a cushioning material, and the roll follows the heat shrinkage of the shaft, preventing cracks, falling off, etc., and improving thermal shock resistance. .

Next, the most typical embodiment of the present invention will be specifically described.

(Example) Example 1 800 kg of water and a commercially available silica-alumina fiber having a shot content of 50% (trade name: ibiwool) were charged into a vessel with a stirrer having a volume of 1 m ³ and stirred for 15 minutes. A slurry solution of silica-alumina fiber was prepared. On the other hand, flow rate 170 / min, water pressure
1.5 kg / cm ² of pressurized water was sent in, and the fiber slurry was guided at a flow rate of 80 / min from the top of the cylindrical vessel to the center of the vortex, and after loosening the flocs, the slurry was discharged from the center of the vortex. It was collected on a 30-mesh wire mesh.

By performing such a treatment, coarse shots (150 μm or more) in the silica-alumina fiber were removed, and the content of shots having a particle size smaller than that could be reduced to 20% or less.

Next, the above treated silica-alumina fiber 29
0 g, 72 g of alumina fine powder, 72 g of Kibushi clay and 54 ml of acrylate latex (solid content: 45%) were added to 25 pieces of water and sufficiently stirred and mixed to form a slurry. To this slurry, 118 ml of a 7.5% solution of a polyacrylamide-based pseudo-collecting agent and 400 ml of a 10% solution of a sulfuric acid band were added, and a sheet having a wet thickness of 18 mm was formed by a paper machine.

Next, after performing dehydration press molding to a thickness of 6 mm in a wet state and drying, the sheet was punched into a disk having concentric circles to obtain a donut-shaped annular body (2). A predetermined number of the annular bodies are inserted and laminated on a metal shaft (1) as shown in FIG. 1, and both ends thereof are fixed with metal washers (3) and nuts (4) to smooth the roll surface. The surface of the roll was dipped with a silica sol solution (solid content: 20%) while rotating the roll so that the thickness of the impregnated layer became 1 mm, and then dried at a temperature of 105 ° C. Table 1 shows the physical properties of the rolls thus obtained. The size of the test roll used in this example was 65 mm in surface length, 55 mm in outer diameter of the ceramic part, and 22 mm in inner diameter.

The surface hardness of the forming roll was measured by JISK using a hardness meter for hard rubber and plastic.
Measured by 7215.

Further, in the abrasion test, a roll fired at 650 ° C. for 4 hours was placed on a rotor plate (7) (rotating a sandpaper to a steel plate) by rotating a forming roll (6) using a tester shown in FIG. And a constant weight (9) was applied thereto, and the abrasion weight loss of the forming roll when the rotor plate was rotated at a rotation speed of 72 rpm was measured.

Further, the spalling test was conducted in an electric furnace maintained at 650 ° C. and at room temperature for 5 cycles of 1 hour cycle.

The surface smoothness of the roll was determined based on whether or not the difference between the irregularities exceeded 200 μ as measured by a surface roughness meter.

Example 2 A roll prepared from a ring formed in the same manner as in Example 1 was mixed with a 20% solution of silica sol and a 20% solution of alumina sol at a ratio of 3: 1 so that the impregnated layer became 4 mm. Dipped while rotating and dried. The physical properties of the roll are shown in Table 1.

Hereinafter, physical properties of the rolls of Examples 3 to 8 were measured in the same manner after the rolls were prepared, and after the surface treatments shown in Table 1 were performed.

Comparative Example 1 A commercially available asbestos plate was punched out in a donut shape to form disks (2), and a predetermined number of these disks (2) were fitted into a metal pipe and laminated and compressed in the same manner as in Example 1. After fixing both ends with a metal washer (3) and a nut (4), the roll surface was ground smoothly to obtain an asbestos roll. As a result of measuring various physical properties of the roll, physical properties as shown in Table 1 were obtained.

Comparative Example 2 Various physical properties of the roll made of the ring-shaped body (2) produced in the same manner as in Example 1 were measured without treatment with an inorganic colloid. The result is It is shown in the table.

Comparative Example 3 290 g of aluminosilicate fiber treated in the same manner as in Example 1, 81 g of alumina fine powder, 70 g of Kibushi clay, 43 g of magnesia fine powder and 60 ml of nitrile butadiene latex
(Solid content 40%) was added to 25 water and stirred and mixed well to form a slurry. To this slurry, 118 ml of a 7.5% polyacrylamide flocculant and 200 ml of a 20% sulfuric acid band were added. Then, a sheet having a wet thickness of 18 mm was formed by a paper machine.

Next, the wet shape was subjected to dehydration pressing to a thickness of 6 mm and dried to obtain an annular body (2) having concentric circles. A predetermined number of such annular bodies (2) are inserted and laminated on a metal shaft (1) as shown in FIG. 1, and both ends thereof are fixed with a metal washer (3) and a nut (4). Was brush-coated on the surface of the roll having a smooth surface at a rate of 75 g / m ² per surface area, and dried at a temperature of 100 ° C. Table 1 shows the physical properties of the roll thus obtained.

(Effects of the Invention) As is clear from the above, the glass transporting roll of the present invention is a glass transporting roll inside and outside a high-temperature heat treatment furnace, and includes silica-alumina fiber,
In a disk roll in which a large number of annular molded bodies formed of an inorganic filler, an inorganic binder and, if necessary, an organic binder are compression-fitted on a metal shaft, an inorganic colloid impregnation impregnation layer is provided on the surface of the disk roll. A roll double structure is provided by providing so as to satisfy the formula (I). "
The high heat-resistant roll made of the conventional asbestos roll and silica-alumina fiber which is a high heat-resistant fiber (Japanese Patent Application Nos. 59-253092 and 61-258781).
) Has the following excellent characteristics as compared to

(1) The rolls of the present invention are asbestos rolls and Japanese Patent Application No.
Compared with the roll of No. 3092, the amount of wear was reduced,
It has almost the same wear rate as the roll shown in No. 258781, and has no problem in durability due to wear.

(2) With regard to the smoothness of the roll of the present invention, since the inorganic colloid solution was applied as a roll using aluminosilicate fiber, the roll could be used as a glass transport roll.

(3) In the roll of the present invention, the thickness T of the impregnated adhesion layer is (I)
As shown in the formula, the roll has a double structure, and the inside of the roll serves as a cushioning material for relaxing stress caused by thermal shrinkage at high temperatures.
Compared to the roll shown in No. 258781, the spalling test shows no cracks and is resistant to thermal shock, so there is no risk of the roll falling off.

[Brief description of the drawings]

FIG. 1 is a front view of a glass transport roll of the present invention. Second
FIG. 3 is a side view of the same, and FIG. 3 is a perspective view of an abrasion tester used for measuring a wear reduction rate of the roll. DESCRIPTION OF SYMBOLS 1 ... metal shaft, 2 ... annular body, 3 ... metal washer, 4 ... nut, 5 ... inorganic colloid impregnated impregnated layer, T ... impregnated impregnated layer thickness (mm), 6 ... ... Roll for test, 7 ... Support, 8 ... Jig for attaching weight, 9 ...
… Weight for weight adjustment.

Claims (2)

(57) [Claims] 1. The shot content of a metal shaft (1)
A doughnut-shaped molded plate (2) processed to have a bulk density of 0.5 g / cm ³ or more composed of 30% or less of silica-alumina fiber, an inorganic binder and an organic binder is compression-inserted into a transport roll. After the inorganic colloid solution is roll-assembled and polished on the surface, it has a layer (5) impregnated and dried,
A glass transport roll having a double roll structure having an unattached layer inside. 2. The inorganic colloid solution is one or more of silica sol, alumina sol and zirconia sol, and the thickness T of the impregnated and attached layer (5) is represented by the following formula: 1 mm ≦ The thickness of the impregnated layer T ≦ 0.5 (R ₁ −R ₂ ) / 2 (I) R ₁ Roll outer diameter (mm) R ₂ : Metal shaft outer diameter (mm) Feature: Claim 1 Rolls for transporting glass.