JP2000317288A - Device for sprinkling adhesive to powder and granular material transported by gaseous stream - Google Patents

Abstract

PROBLEM TO BE SOLVED: To completely prevent the closure of a pipeline and to enable continuous operation for a long time by constituting a powder and granular material transporting pipe in such a manner that its cross section of its pipeline expands on the downstream side of an adhesive injection port. SOLUTION: This sprinkling device consists of the small-diameter transporting pipe 11 on an upstream side, the large-diameter transporting pipe 12 on a downstream side, a pipe cross-section expanding part 13 disposed therebetween and an adhesive injecting pipe 14 disposed in the pipe cross-section expanding part 13. The adhesive injecting pipe 14 is connected to the upstream side end of the pipe cross-section expanding part 13, from where the adhesive 14-1 is injected into the transporting pipeline. The adhesive 14-1 is not much dispersed near the injection port and flows concentrically into a vapor stream and, therefore, the vapor stream is as if bar-like foreign matter crosses the stream when viewed from the vapor stream and great Karman's vortex arrays 16 are generated behind the injected adhesive and the stream of the adhesive 14-1 is rapidly dispersed as splashes by the reaction thereof while the stream meanders largely. The splashes are brought into contact with the surface of wooden fibers 15 in the gaseous stream and are eventually sprinkled on its surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for injecting an adhesive into a transport pipe for transporting a granular material by an air current and spraying the adhesive on the granular material. The present invention relates to an apparatus for spraying a system adhesive.

[0002]

2. Description of the Related Art A technique for producing a product such as a board by applying an adhesive to powder or granules and compressing and molding the adhesive into a desired shape is known. For example, when manufacturing a medium wood fiber board (MDF), an organic isocyanate such as a urethane-based resin or an amino-based An adhesive such as resin is injected, and the fiber is glazed on a wood fiber, which is compression-molded to obtain a desired board. However, in such devices, blockage of the transport line often occurs.

In a typical glazing apparatus, the transport line is a stainless steel tube having an inner diameter of about 25 to 150 mm and a diameter of 5 to 15 ba.
r, 150-200 ° C, 1-3t / hr steam flow, 5 ~
A 10 t / hr fiber is transported, and a urethane-based adhesive such as MDI (diphenylmethane diisocyanate) is added to the fiber at an addition rate of about 1 to 3 t / hr. Blockage occurs during operation for about an hour. Therefore, continuous operation can be performed for about several hours, and after such operation, the device needs to be disassembled and cleaned or the closed portion needs to be replaced, so that there is a problem that the operation efficiency of the device decreases and the cost increases. There is a need for a device that can be operated continuously for a long time.

[0004] Further, since such blockage of the transportation pipeline causes a great damage to the entire plant, complete preventive measures are required.

[Problems to be solved by the invention]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to completely prevent the blockage of a powder fluid transport line, thereby enabling continuous operation for a long time. It is to provide a device.

[Means to solve the problem]

[0006] Since the adhesive is injected at a high speed from a nozzle having a diameter of about 6 mm, the adhesive is scattered in the pipe and comes into contact with the wood fiber and is sprinkled.

[0007] The powdery fluid that has been well dusted with the adhesive may be slightly sticky and may adhere to the tube wall. However, the adhesive force is extremely small compared to the fluid resistance due to the air flow.
Therefore, the powder fluid itself does not stay in the pipe wall for a long time. Thus, no blockage of the transport line occurs after the adhesive has been completely sprayed with the powdered fluid.

[0008] The blockage occurs immediately after the adhesive injection, and the reason that the blockage occurs at such a location is that the flow of the injected adhesive is made up of steam and powder fluid flowing through the transport line. It acts as a rod-shaped obstacle projecting into the transport pipeline against the flow of the mixture, and generates a Karman vortex street downstream of the obstacle. This Karman vortex street,
The reaction causes the flow of the injected adhesive to meander violently. Its main meander is the central axis (Z
Axis) and the XZ plane perpendicular to the YZ plane defined by the adhesive injection direction (Y axis), but the secondary meandering also occurs in the YZ plane, so that part of the tube wall Adhesive droplets will adhere.

When the adhesive droplet adheres to the tube wall, the adhesive does not easily peel off because the adhesive force is larger than the fluid resistance due to the air flow, and the adhesive adheres to the powder fluid conveyed by the air flow. Violently collide, causing the deposit on the tube wall to grow, and in some cases, being exposed to high temperatures for a long time, the curing reaction of the deposit proceeds and solidifies. When the solidified sticky substance is generated on the pipe wall, the adhesion of the adhesive droplets is further promoted, and the sticking of the powder and the granular material is further promoted, so that the solidified substance is solidified. The deposited matter grows rapidly and immediately blocks the transport line.

Therefore, it has been found that in order to prevent such a blockage of the transport pipeline, it is sufficient to prevent the splash of the adhesive from coming into contact with the pipe wall in the vicinity of the injection port of the adhesive. In order to prevent the adhesive from coming into contact with the pipe wall in the vicinity of the injection port of the adhesive, the present invention is configured to enlarge the cross section of the transport pipe downstream of the injection port of the adhesive. Is to achieve.

Thus, the enlarged section of the cross section of the pipe used here includes:
It is recommended to use a known concentric or eccentric butt welding reducer or the like, but an appropriately designed tapered tube or the like may be used. Also, adjust the diameter of the small diameter part on the upstream side.
d, when the diameter of the enlarged large diameter portion is D, the diameter expansion ratio D / d is 1.2 or more. Although there is no upper limit for this value, it is desirable to be 2 or less in practical use. Also, the length of the enlarged part is H
There is no upper limit for the value of (D−d) / H.

BEST MODE FOR CARRYING OUT THE INVENTION

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a partially cutaway top view showing the configuration of the first embodiment according to the present invention, FIG. 2 is a longitudinal sectional view showing the configuration of the first embodiment, and FIG. 3 is a part showing the configuration of a known glazing apparatus. FIG. 4 is a longitudinal sectional view illustrating the operation of the apparatus shown in FIG. 3, and FIG. 5 is a sectional view taken along a line (A-A) perpendicular to the axis of the apparatus shown in FIG.
6 is a longitudinal sectional view showing a second embodiment of the present invention, FIG. 7 is a longitudinal sectional view showing a third embodiment of the present invention, and FIG. 8 is a longitudinal sectional view showing a fourth embodiment of the present invention. FIG. 9 is a longitudinal sectional view showing a fifth embodiment according to the present invention, and FIG. 10 is a longitudinal sectional view showing a sixth embodiment according to the present invention.

[0013] The sprinkling device 10 shown in Figs. 1 and 2 has a small-diameter transport pipe 11 on the upstream side, a large-diameter transport pipe 12 on the downstream side, and a pipe cross-section provided therebetween. Enlargement section
13, consisting of an adhesive injection pipe 14 provided in the expanded section 13 of the pipe, and in these transport pipes, the defibrated wood fiber 16 is in the Z-axis direction by the high-pressure steam flow, that is, in the central axis direction of the transport pipeline. Are transported from left to right in the direction of the arrow in the figure.

In the present embodiment, a concentric two-shape reducer referred to in JIS B2311 or the like, that is, a simple tapered tubular reducer is used as the tube cross-sectional enlarged portion 13. The adhesive injection pipe 14 is connected to the upstream end of the enlarged pipe section 13, from which the adhesive 14-1 is injected into the transport pipeline. The adhesive 14-1 is not dispersed very much in the vicinity of the injection port and flows in a concentrated manner in the steam flow, so that a stick-like foreign substance crosses the flow as viewed from the steam flow. For this reason, as shown in FIG. 1, a strong Karman vortex street 16 is generated behind the injected adhesive, and the reaction causes the flow of the adhesive 14-1 to form a large meandering and rapidly droplets. The wood fibers 15 are dispersed and brought into contact with the surface of the wood fiber 15 in the air stream, and are sprinkled on the surface.

When this state is compared with that in the known glazing apparatus shown in FIGS. 3 to 5, in the known glazing apparatus 20, the transport conduit 21 is not enlarged, and thus the adhesive injection port 24 is not provided. The adhesive 24-1 to be injected from the container meanders more strongly, and the pipe wall of the transport conduit 21 is close, so that at a position C shown in FIG. Will be done. Once the adhesive sticks in this way, the wood fiber or chip 25 in the air stream collides with the sticky substance, pierces, the deposit grows, and in some cases, is exposed to a high temperature for a long time. The solidification reaction progresses, and solidifies in the middle.

When such solidified projections are formed, the adhesion of the droplets of the adhesive 24-1 is promoted, so that the growth of the projections is further accelerated and the transport pipeline is closed. is there. In this embodiment, since the width of the transport line is widened, the meandering of the adhesive is alleviated, and a margin is formed inside the transport line. And does not adhere to the inner wall of the transport pipe, so that the transport pipeline is not blocked.

Next, in the second embodiment shown in FIG. 6, the sprinkling device 30 is provided between the upstream small-diameter transport pipeline 31, the downstream large-diameter transport pipeline 32, and the middle thereof. It comprises a tube cross-section enlarged portion 33 and an adhesive injection tube. Thus, in the present embodiment, the adhesive injection pipe 34 is provided not at the enlarged pipe section 33 but at the downstream end of the small-diameter transport pipe 31 on the upstream side. The operation and effect of this device are the same as those of the first embodiment already described, and the description thereof will be omitted.

Next, a third embodiment shown in FIG. 7 will be described. The sprinkling device 40 can connect the upstream small-diameter transport pipe 41 and the downstream large-diameter transport pipe 42 to the flanges 41-1 and 42-1 without using a reducer.
Is a direct connection. The operation of this gliding device is also considered to be self-evident, and the description thereof will be omitted.

Next, a fourth embodiment will be described with reference to FIG. The glazing apparatus 50 is configured by connecting an upstream small-diameter transport pipeline 51 and a downstream large-diameter transport pipeline 62 by an eccentric reducer 53. This device also completely prevents blockage of the transport line.

The embodiment shown in FIG. 9 is the same as the above-described fourth embodiment except that the method of using the reducer is different. The glazing apparatus 60 is configured by connecting an upstream small-diameter transport pipe 61 and a downstream large-diameter transport pipe 62 with an eccentric reducer 63, which is different from the fourth embodiment described above. Differs in the way the reducer is connected. Although depending on the transportation conditions of the powder, the clogging of the transportation pipeline is completely prevented in this embodiment as well.

In the first to fourth embodiments, a reducer is provided further downstream of the large-diameter transport pipe on the downstream side to reduce the diameter of the upstream small-diameter transport pipe. It is recommended to match the pipe diameter of the road.

The glazing device 70 shown in FIG. 10 is a fifth embodiment, which uses the same glazing device as that of the first embodiment. In this, a small-diameter upstream transport pipeline 73, a reducer 74 and a downstream large-diameter transport pipeline 75 are sequentially connected,
This is provided with an adhesive injection tube 76. This embodiment is applied when the transport airflow velocity in the transport pipe is slightly low.

【The invention's effect】

Since the present invention is constructed as described above, according to the present invention, the blockage of the powder fluid transport line can be prevented or the occurrence of blockage can be significantly delayed, and continuous operation can be performed for a long time. There can be provided a device for obtaining.

[Brief description of the drawings]

FIG. 1 is a partially broken top view showing a configuration of a first embodiment according to the present invention.

FIG. 2 is a longitudinal sectional view showing the configuration of the first embodiment.

FIG. 3 is a partially cutaway top view showing the configuration of a known glazing device.

FIG. 4 is a longitudinal sectional view for explaining the operation of the device shown in FIG.

5 is a cross-sectional view (A-A) of the device shown in FIG.

FIG. 6 is a longitudinal sectional view showing a second embodiment according to the present invention.

FIG. 7 is a longitudinal sectional view showing a third embodiment according to the present invention.

FIG. 8 is a longitudinal sectional view showing a fourth embodiment according to the present invention.

FIG. 9 is a longitudinal sectional view showing a fifth embodiment according to the present invention.

FIG. 10 is a longitudinal sectional view showing a sixth embodiment according to the present invention.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masaki Sugawara 1190 Kasama-cho, Sakae-ku, Yokohama-shi, Kanagawa Mitsui Chemicals, Inc. (72) Inventor Yasuhiro Matsuzaka 1190 Kasama-cho, Sakae-ku, Yokohama-shi, Kanagawa Mitsui Chemicals, Inc. Inventor Naohiro Murata 1190 Kasama-cho, Sakae-ku, Yokohama-shi, Kanagawa F-term (reference) 2B260 BA01 BA19 DA01 DA05 EB08 EB13 EB19 EC18 4G035 AC22 AE13 4J040 EF001 MA08 MB02 MB07 NA13

Claims (6)

[Claims] Claims: 1. An apparatus for injecting an adhesive into an airflow in a powder transporting pipe and spraying the adhesive on the powder, wherein the powder transporting pipe is provided with an enlarged pipe section, An apparatus for applying an adhesive to the above-mentioned granular material, wherein an adhesive injection pipe is connected to the enlarged portion or an upstream side thereof. 2. The tube cross-section enlarging portion provided in the powdery material transporting tube is a reducer for continuously enlarging the tube cross-section.
An apparatus for spraying an adhesive on the granular material according to (1). 3. The apparatus according to claim 1, wherein the enlarged pipe section provided in the powder transport pipe is a pipe joint for discontinuously expanding the pipe section. 4. An adhesive is applied to the powder or granule according to any one of claims 1 to 3, wherein a reduced pipe cross section is provided on an upstream side of the enlarged pipe cross section provided in the powder transport pipe. apparatus. 5. The apparatus according to claim 1, wherein the granular material is a defibrated wood fiber. 6. The apparatus according to claim 1, wherein the adhesive comprises an organic isocyanate.