KR960001007B1 - The equipment and the method for inorganic fibrous materials - Google Patents

Abstract

producing a fiber with molten solution melted at high temperature and simultaneously coating the produced fiber with a fibrous binder by an injection process; laminating the coated fiber on a transferring net(3); and drying and hardening the inorganic fiber in drying furnace. The fiber is passed between upper and lower first compression conveyors(6) with different speed under the condition that wrinkles are not occurred, heated, passed between upper and lower rollers(7) for surface treatment so as to form a semi-hardened layer on its surface, and passed between upper and lower second compression conveyors(8) of which the transferring speed is slower than that of the first compression conveyors(6) and between compression rollers(9) so as to form the hardened surface layer without occurrence of wrinkles. The obtained fibrous mat has high surface compression strength and high resistance to bending.

Description

Method for improving compressive strength of inorganic fiber plate and its device

Figure 1 (a) is a perspective view of the inorganic fiber plate-like body by a conventional manufacturing method. (b), (c) is a perspective view showing the inorganic fiber plate-like body by the method for obtaining the conventional improved compressive strength.

2 is a longitudinal sectional view of the inorganic fiber plate-like body according to the present invention.

Figure 3 (a) is a conventional manufacturing process diagram. (b) is a manufacturing process chart according to the present invention.

Figure 4 is a side view showing an apparatus for producing an inorganic fiber plate-like body according to the present invention.

5 is an explanatory diagram showing a method for measuring the degree of bending.

* Explanation of symbols for main parts of the drawings

1: Islanding device 2: Surface device

3: transfer nat 4: mill roller

5: initial fiber 6: primary compression conveyor

7: surface treatment roller 8: secondary compression conveyor

9: compression roller 10: drying furnace

11 surface treatment means

The present invention is a method and apparatus for neutralizing the compressive strength of the inorganic fiber platelet body so that the compressive strength of the inorganic fiber platelet is accelerated by converting a part of the inorganic fiber used as the material of rock wool or glass wool from the horizontal irregular state to the vertical irregular state It is about.

In general, inorganic fibers are obtained by melting minerals at high temperature and fiberizing them with a spinning machine such as a spinner wheel. At this time, the fiber binder is sprayed on the surface of the fiber, and the fibers dropped onto the collecting net are transported to a certain thickness and moved in a dryer. By allowing it to cure, it was possible to produce the desired inorganic fiber platelet.

The inorganic fiber platelet produced by this conventional method is shown in Fig. 1 (a).

As can be seen from the conventional inorganic fiber platelets, since inorganic fibers are stacked in an irregular state only horizontally, they are not only easily bent or broken by vertical compression, but also have low durability against tearing in the thickness direction. Is there.

Therefore, such a conventional inorganic fiber plate has a defect that causes the deterioration of the stepped surface is not easily recovered to its original state when the worker is inadvertently stepped on the construction work in the field, causing the functional degradation as a heat insulating material. In addition, when cutting the inorganic fiber plate in processing fixation, since the arrangement of the fibers is only horizontal, swelling and layer separation are easily generated, resulting in poor workability such as easy bending. Therefore, the necessity to make up for it has emerged.

Therefore, conventionally, in order to increase the compressive strength, in the series of manufacturing processes for manufacturing the inorganic fiber platelet, the density of the laminated fibers is increased by giving a difference in overall conveying speed such as the net and the conveying conveyor. In order to obtain a densified inorganic fiber platelet, the overall compressive strength was increased due to the increase in density, even though the fiber arrangement was only in the horizontal direction, thereby improving workability as described above.

According to this method, as the inorganic fibers are densified, the overall strength is improved, and workability is improved. However, a large amount of fiber binders and inorganic fibers are used to improve manufacturing costs and increase unit weight. It was.

Attempts have been made to solve these problems, an example of which can be found in US Pat. No. 2,409,066.

This is the process of realigning the fiber array where some of the fibers are not transported on the horizontal line while passing through the low speed conveyor by passing the initial fiber body conveyed from the collecting net at a lower speed than the collecting net, and the upper side is inclined. The density is partially increased while passing through, and the longitudinal wrinkles are obtained. In this state, the inorganic fiber platelets are in a state in which fibers are horizontally and vertically arranged, so that the compressive strength is improved compared with the conventional horizontal only. Will be obtained.

However, these inorganic fiber platelets have a problem that the wrinkles are partially formed and thereby the flexural strength is lowered. The longitudinal section of the inorganic fiber platen frame is shown in FIG. 1 (b).

In addition, in US Patent No. 4,567,078 published as a similar technology, this is also performed by the first and second conveyors installed in the advancing direction of the plate-shaped inorganic fiber body, which is continuous by a horizontally installed conveyor consisting of a pair of upper and lower By gradually longitudinally compressing gradually, the overall fiber arrangement is converted from the horizontal to the vertical arrangement to improve the compressive strength.

However, this means that the number of conveyors used in the process of converting the fiber array into the vertical array is also limited by various conditions, and thus the longitudinal compressibility cannot be sufficiently improved, and the flexural strength is also insufficient. The longitudinal cross section of the inorganic fiber plate-shaped object by this is shown in FIG. 1 (c).

In addition, referring to Korean Patent Publication No. 91-9701, this also allows compression to be performed by the first and second conveyors inclined in the advancing direction of the plate-shaped inorganic fiber body, but within the range of preventing wrinkles from forming on the surface of the fiber body. Since it is to improve the formation of the longitudinal wrinkles is prevented to obtain a plate-shaped body in which the fibers are irregularly bonded as shown in Figure 1 (c).

This example platelet can perform longitudinal compression in a somewhat better condition than the aforementioned US Pat. No. 2,409,066, but it is still necessary to perform compression in a limited range that does not cause wrinkles on the surface and back of the inorganic fiber platelet. There is a problem that prevents compression.

In addition, even if the compression is made to the best in the range that does not form such wrinkles by the simple vertical arrangement of the fiber is a problem that the bending occurs badly during construction work and can not easily be broken.

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned problems. First, compressive strength can be prevented from being formed while the compressive density is sufficiently higher than the limit common to previous US patents or Korean patents. Improve the tear resistance and flexural strength, and provide excellent physical properties that can be used evenly in various applications. Secondly, it is possible to prevent swelling or layer separation during cutting operations. The purpose is to improve workability.

The object of the present invention is to recognize that the increase in the thrust due to the simple speed difference of the conveying means is bound to be limited as the wrinkles are formed, and to improve the primary density by placing the speed difference and then to the inner layer and In contrast, by performing a surface treatment process of semi-hardening a constant thickness of the surface, and then by the conveying means having a speed difference for the purpose of improving the density of the second to improve the density again by the increase in the density of the inner layer It can be achieved by allowing the inorganic fibers to form a vertical arrangement while preventing wrinkles on the surface.

3 illustrates a conventional compressive strength neutralization method and a compressive strength intermediate process according to the present invention.

As can be seen from this, the inorganic melt dissolved at high temperature of the present invention is subjected to the spinning in the spinning machine and at the same time the fiber binder is sprayed to coat the fibers, and to be laminated to the transfer net by airflow, whereby the inorganic mineral oil is transferred to the drying furnace. Before the final thickness plate is completed, the compression process is performed by the speed difference of the primary compression conveyor, and then it is heated between the upper and lower surface treatment rollers which are heated and rotated at the same speed as the electric primary compression conveyor. By passing under pressure, a surface hardened layer is formed.

Subsequently, compression is performed again in the secondary compression conveyor by passing it through a secondary compression conveyor having a lower rotational speed than the electric primary compression conveyor. At this time, the inorganic fibers are vertically compressed by the high compression ratio to form wrinkles. It is possible to prevent the formation of wrinkles on the surface by the surface semi-hardened layer by the roller for the upper and lower surface treatment.

In this process, it is possible to prevent the formation of wrinkles while being compressed again at a high density, and in this state, the compression roller is passed through a drying furnace to obtain an inorganic fiber plate body hardened to the final thickness.

The inorganic fiber platelet according to the present invention is shown in FIG. 2.

As can be seen from the final plate-like body according to the present invention is a structure in which the inorganic fibers of the surface hardening layer is horizontally arranged and firmly bonded, and the inner layer is a structure in which the inorganic fibers are vertically arranged and combined to form wrinkles. While the longitudinal compression ratio can be improved by the inorganic fibers arranged, the flexural strength is reinforced by the surface hardening layer and the inorganic fibers of the inner layer, thereby obtaining excellent physical properties with little warpage or damage.

An example of a specific apparatus for carrying out this invention is shown in FIG.

As can be seen from this, the inorganic melt melted at a high temperature is used to prepare the fiber in the islanding apparatus 1, apply a binder, and then introduce it into the collector 2 by a feeder.

The introduced fibers are very well ventilated and are slightly laid down by the mill rollers before being transported to the outside of the collecting device 2 and stacked in a conveying net 3 which allows the fibers to be laminated by air suction at the bottom. The initial fiber body (5) will be formed while being compressed.

In addition, such a closed roller (4) is to compact the initial fiber body 5 in a suitable state for the longitudinal compression process and at the same time to prevent the movement of air flow in and out of the collecting device (2).

Subsequently, the density of the initial fiber 5 passed through the collecting device 2 should be maintained at an appropriate density for a smooth compression process, and in practice, it is preferable to be in the range of 19 Kg / m 3 to 40 Kg / m 3.

This initial fiber body 5 is also introduced into the primary compression conveyor 6 which consists of a pair of upper and lower sides rotated by a drive roller.

At this time, the feed speed by the primary compression conveyor (6) is kept lower than the moving speed of the initial fiber body 5 is introduced, the longitudinal compression is carried out and the speed difference at this time determines the longitudinal compression ratio.

In addition, the upper side of the primary compression conveyor 6 needs to be inclined, and in this way, it is possible to increase the compression ratio without causing wrinkles to be easily formed by gradually compressing it over the front of the conveyor.

In this way, the primary compression conveyor 6 performs longitudinal compression in a range that does not form wrinkles on the surface of the plate-shaped body, and this compression ratio is a function that varies depending on density and thickness and is usually in the range of 10% to 100%. It is done.

In this state, the first compressed inorganic fiber platelets pass through the surface treatment rollers 7 in a pair of upper and lower bars. The surface treatment rollers 7 according to the present invention provide a surface layer of the primary longitudinally compressed fibers. By pressing and heating slightly to serve to crosslink the resin and the fiber on the surface of the fiber body, even if a very high compression in the second longitudinal compression, the wrinkles do not appear on the surface.

That is, when the fiber body is passed through the surface treatment roller 7 heated at 230 ° C to 350% while compressing the thickness by 10% to 50%, the inner surface of the fiber surface layer is 0.2mm to 2mm thick and the resin is bonded. It is to form a harder semi-hardened layer.

At this time, if the surface temperature of the surface treatment roller 7 is too low, the desired semi-hardened layer is poorly formed, and if the surface temperature is too high, the surface is completely hardened and thus weakens physical properties. Therefore, it is necessary to maintain the above temperature range.

Although the surface treatment means 11 in the form of the surface treatment roller 7 is illustrated in the embodiment of the present invention, the surface treatment means 11 in the form of a rectangular box for blowing hot air may be used. In order to implement this form, it is necessary to adjust the blowing pressure appropriately so as not to penetrate the hot air stream in the thickness direction of the inorganic fiber body so that the surface and the back surface of the fiber can be semi-hardened.

In addition, it is preferable that the rotational speed of the surface treatment roller 7 is the same as the conveying speed of the primary compression conveyor 6 so that the semi-hardening treatment of the surface layer is performed in a state where no compression occurs.

Subsequently, primary compression is carried out and the fiber body having a radiused surface enters the secondary compression conveyor.

Here, the installation angle of the upper side of the secondary compression conveyor 8 is in the same range as the primary compression conveyor 6 so that the longitudinal arrangement of the fibers can be made good and evenly formed.

This secondary compression process in the present invention has a very special meaning.

That is, in the present invention, the conveying speed of the fiber body by the secondary compression conveyor (8) is lower than that of the primary compression conveyor (6), and therefore there is a compressive force to continue to be conveyed in the conveying progress direction and the vertical arrangement by this force Secondary compression occurs in which the fibers are not vertically arranged. Particularly, in the present invention, since the surface hardened layer of the fiber body has a low fluidity unlike the inner layer, the inorganic fibers of the inner layer are corrugated vertically by a high compression ratio. Even if arranged, the surface hardening layer is such that the wrinkles of the inner layer is not exposed.

The result is that the compression ratio can be significantly increased as compared with the conventional method in which the compression ratio is largely limited so that wrinkles are not formed in the surface layer by simply giving a speed difference.

As a result of the actual experiment, when the feed rate of the initial fiber body 5 is 6 m / min, the speed of the compression conveyor can be lowered to a minimum of 4.5 m / min to 5 m / min to prevent the formation of wrinkles, in the case of the present invention It has been confirmed that the can be lowered to 2m / min to 2.5m / min and can greatly improve the compression ratio by this speed difference.

The platelet compressed in this way is made more stable through the compression roller 9, and then the binder sprayed on the fiber is completely cured while passing through the drying furnace 10, and the thickness of the final platelet is completed and cut to the required size. Will be packaged and shipped.

Looking at the present invention in more detail by the specific embodiment as follows.

Example 1

In this embodiment, in order to compare the compressibility of the fiber horizontally arranged plate-shaped body according to the conventional manufacturing method with the compression rate of the conventional manufacturing method, which performs the compression step, the fiber horizontally arranged plate by the conventional manufacturing method. The compression rate of the upper body was 0%, and the compression rate of the inorganic fiber plate-like body according to the present invention was compared with the compression rate according to the conventional manufacturing method which performs the compression process.

First, the density of the initial fibrous body 5 is 50Kg / m 3, which is manufactured by a conventional manufacturing method to produce the plate-shaped body shown in FIG. When the result of compression by introducing into the compression conveyor was 0%, the density of the initial fiber was set to 50Kg / m 3 and 12.5m in order to manufacture the plate shown in Fig. 1 (c) by the conventional compression method. It is introduced into the primary compression conveyor with the feed rate of / min to perform the first vertical compression, and it is introduced into the secondary compression conveyor with the feed rate of 10m / min to perform the secondary vertical compression. Although 25% of compression results were obtained, in the present invention, the density of the initial fibrous body 5 was 50Kg / m 3 and introduced into the primary compression conveyor 6 having a feed rate of 14.6m / min. Direction is compressed and the surface treatment roller 7 is Show on the surface, and then was cured by introducing the secondary compression conveyor (8) having a feed rate of 10m / min was obtained a compression ratio of a result of the second 46% so that the compression is performed in the vertical direction.

These results can be seen that wrinkles do not occur on the surface of the inorganic fiber plate-like body even though the result is about 80% better than the compression rate of 25% of the plate-shaped body by the conventional compression method.

Example 2

In this embodiment, the compressive strength and the bending strength of the plate-shaped body in which the inorganic fibers by the conventional manufacturing method is horizontally arranged, the inorganic fiber plate-shaped body manufactured by the conventional compression method, the inorganic fiber plate-shaped body manufactured by the present invention, The flexural properties and the compressibility were compared.

First, in the present embodiment, the density of the inorganic fiber platelet manufactured by the method according to the present invention was 120 Kgf / m 3 and the thickness was 100 mm. The measurement specimen was cut to 400 x 400 mm to 10% of the original thickness. The compressive strength is 1328Kgf / m2 when the load is divided by the unit area at the deformation point, which is 736Kfg / m2 of conventional fiber array, and 1072Kfg / m2 of inorganic fiberboard type by the conventional compression method. It can be seen that it is significantly improved compared to the case.

In addition, the inorganic fiber platelet according to the present invention as described above was cut into specimens of 150 x 200 mm and measured with a span length of 150 mm, and the bending strength of 10.9 Kgf was found. It is 11.5Kgf, but the 1Kgf deflection in terms of bending strength, it can be seen that the improvement of 2Kgf than the 8.9Kgf of the bending strength of the inorganic fiber plate-like body by the conventional compression method.

In addition, in the bending property showing the degree struck down with respect to the horizontal plane when only 100 mm x 1000 mm and 50 mm thick specimens were spread across the width, the inorganic fiber platelet according to the present invention was 33 mm, but the conventional fiber horizontal array platen was 31 mm. It is almost the same level, and in the case of the inorganic fiber plate-shaped body by the conventional compression method, it turns out that it is 47 mm and it improved greatly.

In addition, when the compression ratio of a conventional fiber horizontally arranged platelet is 0%, the compressibility of the inorganic fiber platelet according to the conventional compression method is 90%, and the inorganic fiber platelet according to the present invention described above has a compression rate of 150%. It can be seen that the compression ratio has been greatly improved.

Based on the above results, the inorganic fiber platelet according to the present invention significantly improves the compressive strength and compressibility of the platelet body according to the conventional compression method, while the flexural strength and bending, which are weak points of the platelet body by the conventional compression method. Since it has excellent physical properties with little difference in properties, it is possible to provide various uses and provide excellent quality inorganic fiber platelets having excellent workability.

Claims (8)

At the same time, the mineral melt dissolved at a high temperature is mixed with the spinning machine 1, and the fiber binder is sprayed to coat the fibers, which are laminated to the collecting net by airflow, and the inorganic fibers transported by this are heated and cured in a drying furnace to obtain a final thickness. The upper and lower surface treatment to form a plate-shaped body of the first compression conveyor within the range that does not cause wrinkles on the surface by the speed difference of the primary compression conveyor, and then heated and rotated at the same speed as the battery primary compression conveyor By passing between rollers at a constant pressure, a surface semi-hardened layer is formed, and then passing through a secondary compression conveyor with a lower rotational speed than the electric primary compression conveyor, so that the compression is again performed on the secondary compression conveyor. As the fibers are erected vertically, they are compressed and The compressive strength of the inorganic fibers mogul method platelets, characterized in that the not to have wrinkles by processing the surface radius hwacheung formed by roller surface is formed. The method according to claim 1, wherein the upper and lower surface treatment rollers have a temperature in the range of 230 ° C to 350 ° C. The method of claim 1, wherein the upper and lower surface treatment rollers compress the thickness of the fiber in the range of 10% to 50%. The method according to claim 1, wherein the thickness of the surface semi-hardened layer formed by the upper and lower surface treatment rollers is in the range of 0.2 to 2 mm. The method of claim 1, wherein the density of the initial fibrous body is in the range of 10 Kgf / ㎥ to 40 Kgf / ㎥ the compressive strength neutralization method of the inorganic fiber plate-like body. A collecting device (2) for receiving a conveying net (3) to which fibers can be laminated by a feeder after applying a binder and a binder after producing a binder by using an inorganic melt melted at a high temperature; In the known ones, such as dryers 10 for crosslinking fibers and resins, a drive roller is provided which is longitudinally compressed while moving the initial fiber body 5 at a lower speed than the conveying speed of the conveying net 3. A primary compression conveyor 6 composed of a pair of upper and lower surfaces, and surface treatment means 11 for applying a high heat to form a semi-hardened layer while applying a slight pressure to the front and rear surfaces of the fiber body passing through the primary compression conveyor. ) And, by the secondary compression conveyor 8 which transfers the inorganic fiber body formed with the semi-hardened layer harder than the inner layer at a lower speed than the conveying speed of the electric primary compression conveyor 6, the inorganic fiber of the inner layer has a high pressure. Yulol inorganic fiber sheet compressive strength mogul apparatus body, characterized in that so that wrinkles are not exposed by the surface hardening layer is generated as the compression. 7. A surface treatment means (11) according to claim 6, characterized in that it consists of surface treatment means (11) made of a pair of surface treatment rollers (7) which are rotated at the same speed as the conveying speed by the primary compression conveyor (6) and heated to a high temperature. Compressive strength neutralizer of inorganic fiber plate body. 7. An apparatus according to claim 6, characterized in that it comprises a surface treatment means (11) adapted to supply hot air to the front and back surfaces of the fibrous body at an appropriate pressure.