JPH0784001B2 - How to convey wood-based molding materials - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for conveying a wood-based molding material used for manufacturing a wood-based molding.

(Prior Art) A so-called hard board is well known as a wood-based molded product, and has been used for a long time as a base material for interior parts of automobiles, cabinets of electric products, and the like. This hardboard is generally obtained by adding a binder to a wood fiber obtained by defibrating wood chips, etc. to obtain a wood-based molding material, making the molding material into a mat by papermaking or roll pressing, and supplying this mat to a molding die. Then, it is manufactured through a step of hot compression molding (see, for example, JP-A-52-11085 and JP-A-56-9480). However, according to such a manufacturing method, complication of the process and a decrease in yield cannot be avoided because matting is required, and the moldability is poor, and it becomes difficult to manufacture a molded product having deep drawing. There was a problem.

Therefore, recently, a method for producing a wood-based molded product has been established in which the above matting is omitted to improve productivity and moldability, and already disclosed in JP-A-60-259372 and JP-A-62-90203.
JP-A No. 62-134215 and the like.
This manufacturing method is a material manufacturing process of manufacturing a wood-based molding material by adding a binder or the like to the wood fiber obtained by disintegrating wood chips, and directly or in a predetermined shape to collect the molding material into a molding die. It is roughly divided into a molding process of supplying and hot compression molding. Usually, the material manufacturing process and the molding process are continuously provided, and by continuously operating the equipment of both processes, the molding material is conveyed from the material manufacturing process to the molding process with almost no contact with the outside air and immediately subjected to thermal compression. I try to mold it. The reason for adopting such a manufacturing mode is that the wood fiber itself has a property of easily absorbing moisture, and this moisture absorption causes defects such as scaly and blister at the time of subsequent compression molding. It is due to consideration to reduce it as much as possible.

(Problems to be Solved by the Invention) Incidentally, in the production of a wood-based molded product, the molding process facility is temporarily stopped for some reason, or the material manufacturing process and the molding process are performed due to the circumstances of the production system. In some cases, the wood-based molding material manufactured in the material manufacturing process must be temporarily stored or transported from a separate area. However, according to the above new method for producing a wood-based molded body, since the wood-based molding material is provided in a fibrous form, it will be remarkably bulky if it is piled up as it is, and the whole is blocked from the outside air. Therefore, it becomes extremely difficult to store or transport it, and it becomes difficult to suppress the moisture absorption of the molding material. Also, due to its bulkiness,
Expansion of storage space and reduction of transportation efficiency are unavoidable, resulting in increased cost burden.

The present invention has been made in view of the above background, and makes it possible to easily store or transport water while suppressing the absorption of moisture from the outside air, thereby effectively dealing with the fluctuation of the manufacturing facility for the wood-based molded body. It is an object of the present invention to provide a method for transporting the obtained wood-based molding material.

(Means for Solving the Problems) In order to solve the above problems, the present invention compresses a wood-based molding material obtained by adding a binder or the like to wood fibers to form a compressed body, and the compressed body is stored in a container. Stored in a container, the upper part of the container is covered with a suction case in the vicinity of the molding equipment, compressed air is circulated between the suction case and the molding equipment, and the compressed air collides with a compressed body in the container. The compression body is disentangled while changing the collision position, and the disentangled forming material is carried on the compressed air and conveyed to the forming equipment.

(Operation) In the method of transporting a wood-based molding material having the above-described configuration, the compacted material is greatly reduced in bulk by once forming a compressed body, which can be stored in a small container and easily stored or transported. Moreover, because of its small bulk, it can be easily shielded from the outside air of the molding material during storage or transportation by using, for example, a sheet. In addition, moisture absorption during disentanglement can be suppressed by forming a closed circuit between the inside of the container and the molding equipment to disentangle the compressed body with the compressed air circulating therein.

(Example) Hereinafter, an example of the present invention is described based on an accompanying drawing.

First, an example of a process for obtaining a wood-based molding material which is an object of the present invention will be described with reference to FIG. 2. First, the wood chips W1 in the storage tank 21 are conveyed to the chip washing machine 22, and further, Transport to defibration machine 23, steam and defibrate,
Obtain wood fiber W2. Next, this wood fiber W2 is sent to the hot air blower 25 of the dryer 24, put on the hot air from the dryer 26 to be dried, and is temporarily stored in the cyclone 27 in the dryer 24. Next, the wood fiber W2 in the cyclone 27 is conveyed to the hopper 29 of the mixer 28, and the mixer main body 30 below the hopper 29 is further conveyed.
Supply to. The mixer main body 30 has a built-in stirring blade and a spray nozzle, and while the wood fiber moves in this,
It is well mixed with a binder, an internal release agent, etc. sprayed from a spray nozzle, and is discharged from its discharge port 30a as a wood-based molding material.

The wood-based molding material discharged from the mixer 28 is usually
It is conveyed to a cyclone, which will be described later, in the molding process by pneumatic feeding and used for molding. An example of this forming process will be described with reference to FIG.
It is supplied to the hopper 32 of 31 and is sprayed in the spray container 33 and the laminated container 34 under the hopper 32, and is deposited on the perforated plate 35 in the laminated container 34 to form the material aggregate Wb of the predetermined system. obtain. Next, the laminated container 34 is separated from the spray container 33, the material aggregate Wb is transferred from the laminated container 34 to the holding container 36 by using a separate suction force, and then the holding container 36 is moved to the molding die 37. The suction is released and the material aggregate Wb is put into the molding die 37.
The forming die 37 is composed of a lower die 38, an upper die 39 and a holding frame 40, and is heated to a predetermined temperature in advance, and the material aggregate Wb put into the die is thermally compressed by lowering the upper die 39. After being molded, a molded body P having a thickness of 2.5 mm and a density of about 0.8 g / cm ³ is obtained as an example.

The present invention, in the manufacturing process of the series of wood-based molded article,
It is applied when the wood-based molding material Wa obtained in the material manufacturing process (Fig. 2) is stored directly without being conveyed to the molding process (Fig. 3) and supplied to the molding process as needed. The present invention relates to a method of conveying a wood-based molding material.

In the present embodiment, the wood-based forming material Wa obtained in the above-mentioned material manufacturing process is first compressed by a pressing device (not shown) to a predetermined density to obtain a compressed body, and as shown in FIG. Is stored and stored in the container 1. The compressed body M is
As an example, it has a density of 50 to 200 kg / m ³ and its bulk is 1/3 to 1 as compared with the case where the molding material Wa is simply deposited by its own weight.
It is extremely small at / 15. FIG. 1 shows a delivery device for carrying out the method of the present invention, which is installed near the molding process. This transfer device includes a suction case 2 having the same opening area as the container 1. The suction case 2 is driven to move up and down by the operation of the lifting cylinder 3. When the container 1 is positioned below the suction case 2 and the suction case 2 is lowered, the suction case 2 and the suction case 2 are separated from each other. The open ends of the two are in close contact with each other via the seal member 4, and a space 5 isolated from the outside is defined inside them.

The suction case 2 is provided with a plurality of cylinders 6a and 6b (only two cylinders are shown here for convenience of description) slidably in the vertical direction. The cylinders 6a and 6b are connected to a cylinder 7 fixed to the upper surface of the suction case 2, and are vertically moved by the drive of the cylinder 7 so that the compression body M in the container 1 can be moved.
A constant distance L can be maintained between the and.
Then, the one cylinder 6a is connected to the cyclone 8 with a bug installed in the molding step (FIG. 3) by the duct 9a,
The other cylinder 6b is a suction fan attached to the cyclone 8.
It is connected to 10 by duct 9b. As a result, a closed circuit is formed between the space 5 defined by the container 1 and the suction case 2 and the cyclone 8 via the suction fan 10 so that compressed air circulates therein. Become.

On the other hand, the respective ducts 9a, 9b are connected at two points in the middle thereof by bypass ducts 11a, 11b, respectively. Each bypass duct 11a, 11b has a pair of switching valves 12
It is opened and closed by a and 12b, and the cylinders 6a and 6b are selectively switched between the discharge side and the suction side by simultaneous operation of these switching valves 12a and 12b. That is, the compressed air discharged from the suction fan 10 is ejected into the space 5 from either the cylinder body 6a or the cylinder body 6b by the operation of the switching valves 12a and 12b, and collides with the compression body M in the container 1. Dissolve this. Then, the disentangled forming material Wa is carried to the cyclone 8 by riding on the compressed air sucked into the other cylinder.

A fiber bin 13 is connected below the cyclone 8, and the molding material Wa is dropped into the fiber bin 13 by opening the rotary valve 8a below the cyclone 8. The fiber bin 13 contains a conveyor 14, a doffing roller 15, etc., and the molding material Wa dropped from the cyclone 8 is further unraveled by the doffing roller 15, and the assembling device is provided from an opening 16 at the bottom thereof. It is supplied to the hopper 32 (FIG. 3) of 31.

Hereinafter, a method of carrying a wood-based molding material using the carrying device having the above configuration will be described.

In the present embodiment, the wood-based forming material Wa produced in the material forming step (Fig. 2) is compressed to form the compressed body M, and the compressed body M is stored in the container 1 and, for example, in a remote area. Transport by land to the vicinity of a certain molding process (Fig. 3). The container 1 is covered with a lid to cover the opening, or a sheet covers the entire container 1 to shield the compressed body M from the outside air.

And after waiting for the container 1 to be loaded, remove the cover,
Next, the suction cylinder 2 is lowered by the operation of the lifting cylinder 3 to be coupled to the container 1, and subsequently the cylinders 6a, 6b are lowered by the operation of the cylinder 7 so that the tips of the cylinders 6a, 6b and the compression body are compressed. The distance L with M is kept constant. At this time, the switching valves 12a and 12b are switched to the fully closed side of the bypass ducts 11a and 11b. Next, the suction fan 10 is operated. By the operation of the suction fan 10, compressed air is sent to the one tubular body 6b through the one duct 9b and is ejected from the tubular body 6b into the space inside the suction case. This jet of compressed air flows through the container 1
It collides with the internal compressed body M and disentangles it, and the fibrous molding material Wa generated thereby is sucked into the other cylindrical body 6b.
The molding material Wa sucked into the tubular body 6b is the other duct 9a.
Through the cyclone 8 and separated from the compressed air and stored in the fiber bin 13 below the cyclone 8. On the other hand, the separated compressed air circulates through the suction fan 10.

Thus, the jetting of the compressed air from the one tubular body 6b advances the disentanglement of the compressed body M below the tubular body 6b, and the compressed body M on one side is discharged.
Is gradually dug down. Therefore, the cylinders 7a and 6b are lowered by the operation of the cylinder 7 so that the distance L between the upper surface of the compression body M and the upper surface of the compression body M is always kept constant. As a result, the pressure of the compressed air that collides with the compressed body M is maintained constant, and the disentanglement proceeds efficiently. Next, when the disentanglement progresses appropriately, the bypass ducts 11a and 11b are opened by operating the switching valves 12a and 12b. Then, the compressed air is fed to the other tubular body 6b through the bypass duct 11b, and the sensitivity is such that the compressed body M in the lower portion of the other tubular body 6a is disentangled. The disentangled forming material Wa is sucked into the one cylindrical body 6b, and bypass duct 11a, duct 9a.
It is conveyed to the cyclone 8 through. In this way
The outlets of the compressed air are alternately switched by operating the switching valves 12a and 12b, whereby the compressed body M in the container 1 is disentangled to every corner.

The switching valves 12a and 12b may be operated, for example, by providing a position sensor in the suction case 2 to monitor the digging condition of the compression body M, and switching based on the result.
Alternatively, it is possible to empirically grasp the amount of digging and switch the time setting.

Here, the number and size of the cylinders to be attached to the suction case 2 or the structure of the closed circuit of these cylinders can be varied as shown in FIGS. 4 to 7 instead of the above embodiment. Aspects can be adopted.

FIG. 4 shows that the cylinder attached to the suction case 2 is composed of two large diameter cylinders 61 and a large number of small diameter cylinders 62, and two large diameter cylinders 61 are used as one switching valve. An example in which Va is collected and connected to the suction side duct 9a, and a large number of small-diameter cylinders 61 are grouped, and each is grouped into switching valves Vb and Vc and connected to the discharge side duct 9b. It is shown. In this case, the large-diameter cylinder 61 is always opened to the suction side, and the small-diameter cylinders 62 divided into groups are sequentially opened, so that the flow velocity of the compressed air discharged from the cylinder 62 is reduced by the smaller diameter. And the disentanglement of the compressed body M can proceed more efficiently.

As a modification of the one shown in FIG. 4, as shown in FIG. 5, a large number of small-diameter cylinders 62 are arranged for two large-diameter cylinders 61, and these small-diameter cylinders 62 are arranged. May be divided into groups in the form of stacking. In this case, the compression body M can be disentangled for a larger container 1 by sequentially switching the circuits on the left and right sides of the suction case 2 around the large-diameter cylinder size 61.

Further, as shown in FIGS. 4 and 5 above, a large number of small-diameter cylindrical bodies are used.
As shown in FIG. 6, without using 62, two guide paths 2a parallel to the suction case 2 are provided, and a small-diameter cylindrical body 62 is moved in an airtight manner along each guide path 2a. You can In this case, only two small-diameter cylinders 62 need be used, and the simplification of the device can be achieved.

Further, as a modified example of the one shown in FIG. 6, as shown in FIG. 7, a circular guide path 2b is provided around a large-diameter cylinder 61, and a plurality of small-diameter cylinders are provided along the guide path 2b. The 62 may be moved. In this case, the range covered by the small-diameter cylindrical body 62 is widened, and the compressed body M can be disentangled to the corners of the container 1, which is particularly suitable for a small-sized container 1.

(Effects of the Invention) According to the method for transporting a wood-based molding material according to the present invention, the molding material is stored as a compressed body in a container, and the compressed body is disentangled by compressed air circulating in a closed circuit to form a molding facility. Since it is carried to the storage unit, it is possible to easily suppress the moisture absorption of the molding material during storage or transportation as well as during disentanglement, and also the disentanglement of the compressed body is sufficient, and it is suitable for the production facility for wood-based molded bodies. Even if there is a change, it has an effect of greatly contributing to the stable improvement of the quality of the molded product. Further, by using the molding material as a compressed body, not only the container capacity can be reduced but also the transportation efficiency is improved, and the cost for storing and transporting the molding material can be significantly reduced. Further, since the compressed body is disentangled while changing the collision position of the compressed air, the compressed body in the container can be efficiently disentangled to every corner in the container, and the molding material described above is used as the compressed body. It is possible to maximize the effect.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an example of an apparatus for carrying out the method for conveying a wood-based molding material according to the present invention, and FIG. 2 is an example of a manufacturing process for a wood-based molding material, which is the subject of the present invention. FIG. 3 is a schematic diagram showing an example of a forming process using a wood-based material, and FIGS. 4 to 7 are schematic diagrams showing a modified example of the present conveying device. Wa …… Wooden molding material M …… Compressor 1 …… Container 2 …… Suction case 6a, 6b, 61,62 …… Cylinder 8 …… Cyclone 9a, 9b …… Duct 10 …… Suction fan

Claims (1)

[Claims] 1. A wood-based molding material obtained by adding a binder and the like to wood fibers is compressed to form a compressed body, and the compressed body is stored in a container and stored. Covering with a suction case, circulating compressed air between the inside of the suction case and the molding equipment, colliding the compressed air with a compressed body in the container and changing the collision position to disentangle the compressed body. A method for transporting a wood-based molding material, characterized in that the disentangled molding material is placed on the compressed air and transported to a molding facility.