JPH06271331A - Production of high strength rock wool compact - Google Patents

Abstract

PURPOSE:To more efficiently and stably produce a rock wool compact having 120kg/m<3> density, 100mm size and 2.8kgf/mm<2> strength. CONSTITUTION:When rock wool fibers coated with a thermosetting resin are deposited on a conveyor type cotton collector and hardened in a conveyor type continuous heating and compacting furnace to produce a rock wool compact, plural upper and lower rolls are arranged at the inlet side of the continuous heating and compacting furnace and the speed of rotation of the rolls is gradually reduced from the upper stream side of the forward direction of the rock wool fibers toward the downstream side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a high-strength rockwool molded product, and more particularly, a high-strength rockwool molded product having a higher strength than other rockwool molded products having the same density and the same thickness.

[0002]

2. Description of the Related Art Rock wool fibers are usually mixed with molten blast furnace slag, cold slag (bulk blast furnace slag) or basalt with an auxiliary material such as silica sand for component adjustment, and melted in an electric furnace or cupola. It is manufactured by blowing away the molten slag with centrifugal force or compressed air to form fibers. Then, a thermosetting resin generally called a binder is sprayed onto the rockwool fiber, and then a required amount of the rockwool fiber is laminated and molded. A product manufactured by curing the binder in the rock wool laminated and formed in this manner is called a rock wool molded product, and is used as, for example, a heat insulating material or a sound absorbing material.

FIG. 1 is a schematic view showing the state of lamination of a conventional rockwool molded article 10. As will be understood from this, usually, the rockwool fiber 12 is simply laminated, and in the thickness direction, That is, it can be seen that they are not oriented vertically in the drawing. Although only two fibers are shown in the drawing, the rock wool fiber is laminated in multiple layers from bottom to top.

When the laminated body is folded in the process before firing, each laminated portion 16 of the laminated body constituting the rockwool molded product 14 is oriented in the thickness direction as shown in FIG. . This is called a fold of rockwool fiber. It is known that firing in this state gives a rockwool molded product with the folds maintained, and the strength is improved as compared with other products having the same density and the same thickness.

Conventionally, in order to obtain this fold, for example, in Japanese Patent Publication No. Sho 63-19338, as shown in FIG. 3, a conveyor section by a belt conveyor is provided in the fold step before firing, and the traveling speed of the conveyor in this conveyor section. The rockwool fiber was folded by making the speed faster than the line speed in the firing furnace.

FIG. 3 shows an outline of a production line for that purpose. In the figure, a rock wool fiber production apparatus (not shown)
The rockwool fiber 1 is coated with a thermosetting resin in advance and laminated and molded in the belt conveyor type cotton collector 2.
Then, in the folding device section 3 composed of a belt conveyor, a fold is applied to the rock wool fiber by adjusting the line speed, and the thermosetting resin is cured in the continuous heating molding furnace 4, so that the fold state is fixed and necessary. It secures strength. The line speed of the folding device unit 3 is set to V ₁ ,
If the line speed of the heat forming furnace 4 is V ₂ , then V ₁ / V
₂ = 1.0 to about 1.5.

However, in this method, slippage occurs between the belt conveyor and the rockwool fiber, and a large fold is not obtained. Also, an extreme change in the line speed distorts the rockwool fiber laminate itself and stabilizes it. Then, a situation in which a rock wool molded product cannot be manufactured occurs, so it is difficult to obtain high strength.

Since the conditions are different, it is difficult to generalize it, but the strength of the conventional rock wool molded product is about 1.4 kgf / mm ² for a 100 mm product with a density of approximately 120 kg / m ^3. It is being appreciated. Also, the line speed of the heat forming furnace was at most 2 m / min.

[0009]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a more efficient and stable method for producing a high-strength rockwool molded article, and more specifically a density of 120
It is an object of the present invention to provide a method capable of more efficiently and stably producing a rock wool molded product having a strength of 2.8 kgf / mm ² or more in a 100 mm product of kg / m ³ at a line speed of 2 m / min or more.

[0010]

In order to solve the above problems, the present inventors have focused on the fact that a large fold has not been obtained due to the slip of rockwool fiber, and the lock has to be strengthened. Knowing that it is necessary to realize the folds of wool fiber in a stable manner, in order to realize it, it is necessary to arrange multiple 5
By installing a folding device composed of ~ 8 compression rollers, and gradually lowering the line speed while sandwiching rock wool fiber between the upper and lower rolls, the line speed and folding of the surface-collecting machine that constitutes the preceding laminated molding part Since it can be changed to 1/3 of the line speed of the equipment,
The inventors have completed the present invention, knowing that a large fold can be obtained and high strength can be obtained in both compression strength and bending strength.

Here, the gist of the present invention is that after the rock wool fiber coated with a thermosetting resin is deposited on a conveyor type cotton collecting machine, it is also thermoset in the same conveyor type continuous heating and molding furnace. In the method for producing a rockwool molded article in which a curable resin is cured and molded, a plurality of upper and lower rolls are provided on the inlet side of the continuous heating molding furnace, and the rotational speed of these rolls is from the upstream side to the downstream side in the traveling direction of the rockwool fiber It is a method for producing a high-strength rockwool molded product, which is characterized in that it is adjusted so as to gradually decrease toward the side.

According to a preferred aspect of the present invention, by making the rotation speed of at least one upper roll of the plurality of upper and lower rolls smaller than the rotation speed of the corresponding lower roll, more stable production can be achieved. It will be possible.

[0013]

Next, the operation of the present invention will be described in more detail with reference to the accompanying drawings. The same members are designated by the same reference numerals. FIG. 4 is a schematic explanatory view of an apparatus for carrying out the method according to the present invention. In the figure, rock wool fibers 1 from a rock wool manufacturing apparatus (not shown) are sprayed with a thermosetting resin, for example, Then, it is developed on the conveyor type cotton collecting machine 2 constituting the laminating and forming section and laminated and formed. After that, it is similarly charged into the conveyor type continuous heating and molding furnace 4 and molded, but according to the present invention, prior to that, it enters the folding device 9 composed of a plurality of upper and lower roll pairs 5-8. Preferably, the upper and lower rolls are provided in pairs.

Here, in the method according to the present invention,
The line speed of the laminated rock wool fibers is gradually reduced by the upper and lower roll pairs 5 to 7 which are compression rollers of the folding device, and the folding of the rock wool fibers is generated in the folding device due to the difference in the line speed.

For example, the line speed of the laminated molding unit 2 is set to V
₃ , the line speed of the folding device 9 is V ₄ , and the line speed of the heating molding furnace 4 is V ₂ , preferably
After setting V ₃ > V ₄ > V ₂ , the roll rotation speeds of the upper and lower roll pairs of the folding device 9 are set to V _4-1 and V _4-2 .
Let V _4-3 and V _4-4 be V _4-1 ≧ V _4-2 ≧ V _4-3 ≧ V
It should be _4-4 . At this time, only the rotation speed of at least one upper roll of each roll pair may be lower than the corresponding lower roll rotation speed.

In this way, while maintaining the fold of the rockwool fiber, it is sent to the firing furnace by the roll pair 8 which is a compression roller linked with the line speed of the subsequent heating molding furnace, and is fired to obtain a high-strength rockwool molded product. Becomes The line speed may be controlled one by one, but the effect does not change even if the speed is changed with a group of rolls.

Although an extreme change in line speed may distort the laminated molding itself and warp the laminated molding, the present invention has a compression roller consisting of a pair of rolls which are paired up and down. Even if the line speed changes extremely, the laminated molding itself will not warp. Furthermore, by changing the peripheral speed of the compression roller paired up and down, the effect of further strengthening can be produced.

In this specification, the surface collecting machine, the heating molding furnace and the like are not particularly described, but they are already known and even in the present invention, they may be used according to the conventional method. Those skilled in the art will readily understand from the above description that the invention is not limited thereby. Next, the present invention will be described more specifically by way of its examples.

[0019]

【Example】

(Example 1) In this example, the line speed in each process of applying a phenol resin to a normal rock wool fiber at a ratio of about 2 wt% and making a rock wool molded product by using the apparatus shown in FIG. It shows collectively in 1. The obtained rock wool molded product had a density of 80 kg / m ³ and a thickness of 50 mm (80 kg / m ³ × 50 mm). It should be noted that a belt conveyor was used in the conventional example to give sliding, and no means was taken in the comparative example.

[0020]

[Table 1]

Regarding the compressive strength, the density was 120 kg / m ³ , the thickness was 100 mm, and the effects were compared in a comparative example (normal product), a conventional equivalent example, and an example. The results are shown graphically in FIG. Regarding bending strength, thickness 50 mm, density 80 kg / m ³ , 120 kg / m ³ , 150
At kg / m ³ , the effects were compared between a comparative example (normal product), a conventional equivalent example, and an example. The results are shown graphically in FIG.

As a result, in the example, as can be seen from FIG. 5, the effect of compressive strength was about twice that of the ordinary product and about 1.5 times that of the conventional equivalent product. Further, as can be seen from FIG. 6, the effect of bending strength was increased by about 60% over the conventional product and by about 30% over the conventional product.

Example 2 Each upper roll was made smaller by 5% depending on the number of rotations of the lower roll. As a result, the compressive strength was increased by 10% as compared with Example 1 and the bending strength was increased by several% as compared with Example 1. Similarly, the results are shown in FIGS.

[0024]

Industrial Applicability According to the present invention, since higher strength can be obtained with the same density and the same thickness, it can be used as a rock wool molded article for a floating floor which cannot be applied by the conventional method.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view showing how a conventional rock wool molded product is laminated.

[Fig. 2] Fig. 2 is a schematic explanatory view showing a state of stacking of a rock wool molded product manufactured by the method according to the present invention.

FIG. 3 is a schematic explanatory view of a conventional rock wool molded article manufacturing apparatus.

FIG. 4 is a schematic explanatory view of a roll wool molded article manufacturing apparatus according to the present invention.

FIG. 5 is a graph showing the results of Examples.

FIG. 6 is a graph showing the results of Examples.

[Explanation of symbols]

1: Rockwool fiber manufacturing department 2: Laminate molding department 3: Folding device (belt conveyor) 4: Firing furnace
(Conveyor) 5, 6, 7, 8: Compression roller

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Rin Hayama 1850 Minato, Wakayama City Wakayama Steel Works, Sumitomo Metal Industries Co., Ltd. (72) Innovator Kiyoji Shinchi 1850 Minato, Wakayama City Sumitomo Metal Industries Co., Ltd. Wakayama Works

Claims (2)

[Claims] 1. Rockwool in which a thermosetting resin-coated rockwool fiber is deposited on a conveyor type cotton collecting machine, and then the thermosetting resin is cured in the same conveyor type continuous heating molding furnace to be molded. In the method for producing a molded article, a plurality of upper and lower rolls are provided on the inlet side of the continuous heating and shaping furnace, and the rotational speeds of these rolls are gradually reduced as the rock wool fibers progress from the upstream side to the downstream side. A method for producing a high-strength rock wool molded product, which comprises adjusting. 2. The high-strength rockwool molded article according to claim 1, wherein the rotational speed of at least one upper roll of the plurality of upper and lower rolls is set lower than the corresponding rotational speed of the lower roll. Production method.