JPH0441145Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention is applicable to glassy foam materials that are often used for insulation, heat insulation, cold insulation, lightweight building materials, etc., and are particularly required to have at least one smooth surface. The present invention relates to an apparatus for manufacturing a glassy porous material.

(Prior art and its problems) As disclosed in Japanese Patent Publication No. 44-26942, a vitreous foam raw material is introduced between a pair of upper and lower endless metal belts and guided to a heating furnace for firing and shaping. It is publicly known. Further, Japanese Patent Publication No. 50-4368 discloses that an alkali silicate raw material is introduced between a pair of upper and lower endless belts made of wire mesh or punched metal, and then fired and shaped in a heating furnace.

In order to use a vitreous foam as an interior, exterior, or exterior wall material, the outer surface of the foam is required to be smooth, except in rare cases where it is patterned. According to the previously disclosed example, in the former case, as shown in the attached drawing, many areas of the belt are exposed outside the heating furnace, but due to repeated rapid heating and cooling and the influence of the foaming pressure of the raw material, etc. Deformation strain occurs in the form of wrinkles, and the wrinkles are imprinted on the surface of the fired glassy foam, making it difficult to use as a product as it is.

On the other hand, the latter foams hydrated alkali metal silicate, and the accompanying drawings disclose that the upper belt is housed in a heating furnace, but the belt is shaped like a wire mesh in order to dissipate a large amount of water vapor. Alternatively, punching metal or the like is used. Of course, the resulting foam cannot have a flat surface because the mesh and holes of the belt are imprinted, and separate grinding and polishing means are required to obtain a flat surface. In this invention, there is no need to dissipate moisture, etc., and the upper surface of the raw material can be heated uniformly by passing it through the belt, and of course, a belt with a flat surface is used to form a smooth surface on the foam. The belt is housed in a furnace for uniform heating, and a belt tensioning mechanism is installed to prevent belt deformation over a long period of time, making it possible to stably produce a multifoam material with a smooth surface. It provides equipment.

(Means for Solving the Problems) The present invention is an apparatus for forming a plate-like body by sandwiching raw materials for a glassy porous body between a pair of upper and lower endless heat-resistant belts and firing them in a heating furnace. The heat-resistant belt is a belt that forms a flat surface, the entire belt is housed in a heating furnace, and the axis is arranged in the width direction of the belt, and the upper and lower sides of at least three rolls are arranged in parallel in the running direction. A belt tensioning mechanism is formed by extending the belts alternately, and the belt tensioning mechanism is arranged in the highest temperature region immediately before the forming zone in the furnace.

(Example) The present invention will be described in detail below based on the accompanying drawings.

FIG. 1 is a side sectional view of the present invention, and 1 is a heating furnace which is heated to about 750 to 1000° C. with gas burners on both sides of which are indicated by x marks in the figure. By the way, since the heat is transferred to the multi-foam raw material through the upper flat belt 2, which will be described later, the upper surface of the raw material is heated more uniformly than in the case where the raw material is directly exposed to the flame.

The heating furnace 1 includes a preheating zone A for heating and raising the temperature of raw materials, a firing zone B for foaming and fusing the raw materials in the almost maximum temperature zone, and an upper belt 2 to press the foamed and fused raw materials to form a plate-shaped body. It consists of molding area C.

The upper belt 2 is made of a steel belt that runs by a pulley driven by at least one of its left and right ends, and the entire belt 2 is housed in the heating furnace 1 and kept warm to suppress deformation and strain.

The lower belt 3, like the upper belt 2, consists of a steel mesh belt running on pulleys.
Support rollers 4 and 4' support the respective belts 2 and 3 from above or below, some of which are driven in accordance with the running of the belts.

The deformation strain of the upper belt 2 is mainly a striped deformation parallel to the belt running direction called vertical wrinkles, which occurs when a metal belt is used in a high-temperature furnace. measures will be taken.

5, 5', and 5'' are tension rolls that can be adjusted upward and downward, and the upper belt 2 is alternately stretched over and below these rolls to apply tension and prevent deformation of the belt 2. It is effective to provide the upper belt 2 with more flexibility by providing the tension rolls 5, 5', 5'' near the highest temperature range of the heating furnace 1. The tension roll 5 first compresses the surface of the upper belt 2 in contact with the roll 5 and tensions the opposing surface by large plastic deformation, that is, bending, and then bends the upper belt 2 at the tension rolls 5' and 5''. This operation is repeated while decreasing the degree of flatness to reveal flatness.

Therefore, the number of tension rolls should be at least three, and the number may be increased as necessary. Further, the roll shape may be devised to be shaped like a large drum or a drum depending on the location where deformation strain occurs on the belt.

7 is a device for spraying a release agent slurry onto the surface of the belt 2; the release agent, such as kaolin, prevents the foaming raw material from adhering to the belt 2;

The raw material is then introduced onto the lower belt 3 shown at 8↓, passes through the preheating zone A in the heating furnace 1, foams in the firing zone B, and is press-formed in the forming zone C by the upper and lower belts 2 and 3. In molding zone C, an auxiliary electric heater or gas burner may be provided to adjust the temperature.

The molded body is transferred to a slow cooling furnace in the →9 direction, where it is cooled and becomes a product.

In other words, the present invention stores the upper belt in the furnace.
It is possible to prevent deformation from occurring due to rapid heating and cooling by keeping it warm, and to correct the distortion that occurs by passing it over a tension roll. Conventionally, if such technical measures were not taken, the belt would become deformed and wrinkled within a day or night, and the operation of the device would therefore have to be stopped and the belt replaced. The production loss during that time is enormous, or the glassy foam with the wrinkles imprinted on it has to be subjected to a separate surface polishing process, which deteriorates production efficiency.
Although the cost had been rising, this problem was eliminated and continuous operation for several weeks was made possible.

(Effects of the Invention) The present invention has the effect of being able to stably produce a glassy foam body with a smooth outer surface suitable for building materials and the like over a long period of time.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing an example of the present invention. 1... Heating furnace, 2... Upper belt, 3... Lower belt, 5, 5', 5''... Tension roll.

Claims (1)

[Scope of utility model registration request] In an apparatus for forming a plate-shaped body by sandwiching a raw material for a glassy porous foam between a pair of upper and lower endless heat-resistant belts and firing it in a heating furnace, the upper heat-resistant belt is a belt that forms a flat surface; The entire belt is housed in a heating furnace, and the belt is stretched alternately above and below at least three rolls arranged in parallel in the running direction, with the axis arranged in the width direction of the belt, thereby creating a belt tensioning mechanism. 1. An apparatus for producing a vitreous foam, characterized in that the belt tensioning mechanism is disposed in the highest temperature region immediately before a forming region in a furnace.