JPH0592404A - Manufacturing device of low-density ligneous fiber molded body - Google Patents

Abstract

PURPOSE:To constitute the title device so that uniform mixing can be performed and a molded body whose strength is excellent is obtained in a short time, by a method wherein after raw materials are mixed up with each other by a mixing machine where a spiral guide is installed internally and a plurality of raw material loading pipes are provided, molded into a fixed form and heated by a heater for which steam and high frequency are used together, dried by hot air. CONSTITUTION:Blastpipes 9-11, where blots are fitted to an end part and raw material loading pipes are provided are connected with the part of a mixing machine main body vertically. Water absorbing resin, mistlike high-pressure water, a powder water system adhesive agent and a dried ligneous are fed respectively from a loading pipe 14 of the lower step blast pipe 9, an injection nozzle 13, a loading pipe of the blastpipe 10 and a loading pipe 18 of the blastpipe 11. They are mixed up with each other, raised by a rotation of an inner spiral guide 8 and held into a mixture collecting apparatus 20. When they are fed onto a carrying conveyor 3 by a feeder 2, made into a uniform thickness and heated by a heater 5 for which steam and high frequency are used together, a water system adhesive agent becomes pasty rapidly. Then hot air is blown against the pasty adhesive agent through a hot air duct 26 and the same is dried.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is applicable to a wide range of fields such as packing materials, heat insulating materials, and shock absorbing materials.
.About.0.05) an apparatus for producing a wood fiber molding.

[0002]

2. Description of the Related Art Low-density wood fiber moldings used in a wide range of fields such as packing materials, heat insulating materials, and shock absorbing materials are polyacrylic acid-based polymers in the form of fine particles containing a large amount of water. By adding a powdery water-based adhesive to be mixed to adhere the water-based adhesive to the entire peripheral surface of the polymer particles, add it to the dried wood fibers and uniformly mix using compressed air, The mixture is molded into various shapes and heated by microwaves to generate steam from the water absorbed in the polymer particles, and the steam causes the adhesive to gelatinize, and the gelatinized adhesive is dried. It is manufactured by bonding wood fibers to each other.

[0003]

By the way, in the production of the above-mentioned low-density wood fiber molded body, various raw materials using compressed air, that is, polyacrylic acid-based polymer in the form of fine particles containing a large amount of water, water, A uniform air flow is required in order to uniformly mix a powdery water-based adhesive using as a solvent and dried wood fibers, for example, an existing airflow mixer that moves with a linearly moving air flow. It is very difficult to create a uniform air flow with this, so it is not possible to mix the various raw materials evenly and evenly.
There was a problem that the finished product was not homogeneous. In addition, in order to obtain a uniform mixed state, it has been attempted to mix them in a large capacity mixing chamber, but it is not possible to mix them all at once due to the order in which the various raw materials are mixed. However, there is a problem that it takes a lot of space. Also,
The water absorbed in the polymer particles is heated by microwaves to generate water vapor to gelatinize the water-based adhesive, but it takes time to gelatinize the water-based adhesive. Since the mixing of various raw materials is non-uniform, the distribution of water is also non-uniform, and the gelatinization state of the water-based adhesive is non-uniform, and a uniform low-density wood fiber composition cannot be obtained. Further, there is a problem that the microwave alone causes a running cost and a high manufacturing cost.

The present invention has been proposed in view of the above problems of the prior art, and it is possible to obtain a low-density wood fiber molding which is homogeneous and has excellent strength characteristics in a short time, and is compact and space-saving. An object of the present invention is to provide an apparatus for producing a dense wood fiber molded body.

[0005]

In order to achieve the above-mentioned object, the present invention has a cylindrical mixer body internally provided with a spiral guide, and a blower and a raw material feeding device from the lower side to the middle of the mixer body. It is connected to a raw material mixer in which a plurality of blower pipes provided with pipes are connected and a mixture collector is connected to the upper end of the mixer body via a transfer pipe, and to the mixture collector of the raw material mixer. , A supply feeder for supplying the material of the low-density wood fiber molded body sent from the mixture collector of the raw material mixer according to the required amount, and the material supplied from the mixture supply feeder are formed into a predetermined shape Forming means, a steam / high frequency combined heater for heating / gelatinizing the low-density wood fiber molded body formed into a predetermined shape by the forming means, and heated / gelatinized by the steam / high frequency combined heater Providing an apparatus for manufacturing a low density wood fiber molded article made density wood fiber molded body and a hot air drying with hot air dryer.

[0006]

According to the apparatus for manufacturing a low-density wood fiber molding of the present invention, the raw material mixer is used to uniformly mix various raw materials at a predetermined mixing ratio to mold the material of the low-density wood fiber molding, This is supplied to the forming means by the supply feeder to form a low-density wood fiber formed body having a predetermined shape by the forming means, and the mixture is heated by steam and high frequency combined heating by a steam / high frequency combined heater. The water is heated to gelatinize the water-based adhesive, and the gelatinized water-based adhesive is dried in the hot air dryer with hot air to bond the wood fibers to each other to produce a low-density wood fiber molded body.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a low-density wood fiber molding manufacturing apparatus according to the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic block diagram of an apparatus for producing a low-density wood fiber molding according to the present invention.
(1) is a raw material mixer, (2) is a mixture supply feeder,
(3) is a conveyor, (4) is a molding means, for example, a doctor blade, (5) is a steam / high frequency combined heater,
(6) is a hot air dryer.

As shown in FIG. 2, the raw material mixer (1) has a spiral guide () which is rotationally driven at an appropriate speed by a rotational driving means (not shown) in a cylindrical mixer main body (7). 8) is provided, and three blower pipes (9), (10) and (11) are connected below the middle portion of the mixer body (7) at arbitrary intervals. The blower pipe (9) in the lower stage is equipped with a blower (12) at its end, and is connected with a nozzle (13) for injecting mist-like high-pressure water and an input pipe (14) for injecting superabsorbent resin in the middle. ing. The blower pipe (10) in the middle stage is equipped with a blower (15) at its end, and is connected with a feed pipe (16) for feeding a powdery water-based adhesive containing water such as starch as a solvent in the middle thereof. .. The blower pipe (11) in the upper stage is provided with a blower (17) at its end, and is connected with an input pipe (18) for injecting dried wood fiber in the middle. A transfer pipe (19) is connected to the upper end of the mixer main body (7), and a mixture collector (20) such as a cyclone dust collector is attached to the transfer pipe (19). Therefore,
Lower blower (9) blower (12), middle blower (1
The air flow is generated by the blower (15) of (0) and the blower (17) of the upper blower pipe (11), and this is sent into the mixer main body (7), and atomized high pressure from the nozzle (13). Water is injected into the blower pipe (9) in the lower stage, and at the same time, the input pipe (14)
(16) (18) Super absorbent resin, water-based adhesive and dried wood fiber blower tube (9) (10)
Add to (11). Then, first, the atomized high-pressure water jetted from the high-pressure water jet nozzle (13) and the superabsorbent resin injected from the superabsorbent resin injection pipe (14) are guided in the mixer main body (7). A polyacrylic acid-based polymer in the form of fine particles in which a large amount of water was absorbed by the superabsorbent resin absorbing mist-like high-pressure water in the meantime while spirally rotating along (8) and rising. Then, the polymer and a powdery water-based adhesive such as starch which is charged from the water-based adhesive injection pipe (16) are guided along the guide (8) in the mixer body (7). Spirally spirals and gradually rises, and during that time it becomes a polymer with a water-based adhesive attached to the entire surface of the polymer, and this polymer and dried wood fiber fed from the wood fiber feed pipe (18) Inside the mixer body (7) It spirally turns along (8) and gradually rises, during which the polymer and the dried wood fiber are uniformly mixed to form a mixture (A) which is a material for a low-density wood fiber molded body, When the mixture (A) reaches the upper end of the mixer main body (7), the mixture (A) is sent to the mixture collector (20) via the transfer pipe (19), where the mixture (A) A)
The mixture (A) is collected by the mixture collector (20) as a material for the low-density wood fiber molded body, and the air stream is discharged into the atmosphere.

The mixture supply feeder (2) is connected to the mixture collector (20) of the raw material mixer (1),
The mixture (A) sent from the mixture collector (20) of the raw material mixer (1) is dropped and supplied onto the transfer section (3a) of the transfer conveyor (3) according to the required amount.

The transfer conveyor (3) is composed of a net conveyor using a belt made of a mesh of metal or plastic having good air permeability, and the mixture (dropped and supplied from the mixture supply feeder (2) ( A) is placed on the transport unit (3a) in a stacked state and transported.

The doctor blade (4) is arranged above the transfer conveyor (3) with a predetermined gap, and is placed in a stacked state on the transfer section (3a) of the transfer conveyor (3). The mixture (A) that is conveyed by the above method is scraped off in excess during the conveyance to make the thickness uniform.

The steam / high frequency combined heater (5) is
The water vapor duct (21) is arranged above the transfer section (3a) of the transfer conveyor (3), and the electrode plates (22) (23) are vertically moved across the transfer section (3a) of the transfer conveyor (3). High-temperature and high-pressure steam is jetted from the steam supply means (not shown) from the steam duct (21), and high-frequency generation means (not shown) is provided on both electrode plates (22) (23). Electromagnetic waves from the two electrode plates (22)
By generating a high frequency between (23), the mixture (A) placed and transported on the transport section (3a) of the transport conveyor (3) is heated by using both steam and high frequency.

The hot air dryer (6) is provided with a hot air duct (26) having a heater (24) and a blower (25) attached below the carrying section (3a) of the carrying conveyor (3), By blowing hot air warmed by the heater (24) from the hot air duct (26) by the blower (25),
The mixture (A) placed and conveyed on the conveying section (3a) of the conveying conveyor (3) is dried with hot air.

Next, an explanation will be given of the procedure for producing a flat wood fiber molded product in the low-density wood fiber molded product manufacturing apparatus having the above construction.

First, various raw materials are mixed in a raw material mixer (1) at a predetermined mixing ratio (for example, water: superabsorbent resin: water-based adhesive:
Wood fiber = 30: 1: 1: 1: 5) to form a mixture (A) which is a material for a low density wood fiber molded body. That is, the lower blower pipe (9), the middle blower pipe (10) and the upper blower pipe (11) of the raw material mixer (1)
Each of the blowers (12) (15) (17) is driven to generate an air flow, which is sent into the mixer body (7),
The high-pressure water injection nozzle (13) injects mist-like high-pressure water into the blower pipe (9) in the lower stage, and the injection pipes (14) (16) (1
8) When the super absorbent resin, the water-based adhesive and the dried wood fiber are put into the blower pipes (9), (10) and (11), first, the atomized water sprayed from the high pressure water spray nozzle (13) is sprayed. The high pressure water and the super absorbent resin injected from the super absorbent resin injection pipe (14) are guided in the mixer body (7).
While spirally swirling along and gradually rising, a superfine water-absorbent resin was absorbed in a mist state to form a polyacrylic acid-based polymer in the form of fine particles containing a large amount of water,
After that, the polymer and a powdery water-based adhesive agent made of, for example, starch which is charged from the water-based adhesive charging tube (16) are spirally formed in the mixer main body (7) along the guide (8). While rotating and gradually rising, it becomes a polymer in which powdery water-based adhesive adheres to one surface of the polymer,
Further, while the polymer and the dried wood fibers charged from the wood fiber charging pipe (18) spirally swirl along the guide (8) in the mixer body (7), while gradually rising. The polymer and the dried wood fibers are uniformly mixed to form a mixture (A) which is a material for the low density wood fiber molded body. When the mixture (A) molded in this way reaches the upper end of the mixer body (7),
It is sent to the mixture collector (20) through the transfer pipe (19) and separated from the air stream, and the mixture (A) is supplied to the mixture collector (20) as a material for the low-density wood fiber molded body. As they are collected, the air stream is released into the atmosphere. Then, the mixture (A) collected in the mixture collecting machine (20) as a material for the wood fiber molded body is sent to the mixture supply feeder (2). The mixture (A) may be supplied to the mixture supply feeder (2) after further mixing with a rotary type, a tumbler type, or the like, if necessary.

The mixture (A) sent to the mixture supply feeder (2) is dropped and supplied onto the transfer section (3a) of the transfer conveyor (3) in accordance with the required amount, and the transfer section (3) of the transfer conveyor (3). 3a) is placed and conveyed in a laminated state. After that, when the mixture (A) is transported to the doctor blade (4) by the transport conveyor (3), the doctor blade (4) is placed in a stacked state on the transport section (3a) of the transport conveyor (3). The excess amount of the mixture (A) conveyed by scraping is scraped off, and the mixture (A) is formed into a flat plate with a uniform thickness. When the mixture (A) is formed into a flat plate shape in this manner, it is conveyed to the steam / high frequency combined heater (5) by the conveyor (3), and the high temperature and high pressure sprayed from the steam duct (21) there. And the high frequency generated between the pair of electrodes (22) and (23) are used for heating. Then, since the inside of the low-density wood fiber molded body is heated by the high frequency and the outside is heated by the steam, the water absorbed in the polymer particles is heated by the high frequency to generate steam, and the steam and the steam duct (21). The water-based adhesive adhered to the entire surface of the polymer particles is rapidly gelatinized by being rapidly heated by the water vapor sprayed from the surface. Then, this is conveyed to the hot air dryer (6) by the conveyer conveyor (3), and the gelatinized water-based adhesive is rapidly hot air dried by the hot air blown from the hot air duct (26) to form a flat plate-shaped low-temperature adhesive. A dense wood fiber molding is obtained.

In the raw material mixer (1) in the above-described apparatus for manufacturing a low-density wood fiber molded body of the present invention,
Since the spiral guide (8) is provided in the cylindrical mixer body (7) so that the air flow is swirled and circulated, various raw materials, that is, high pressure water, high Water absorbent resin,
By sequentially adding the water-based adhesive and the wood fiber, it is possible to surely mix the materials of the low-density wood fiber molded product in order, and further, the equipment is downsized and the equipment space and equipment cost are remarkably increased. Be reduced.
Further, since the materials are mixed in a spiral manner by swirling, various raw materials can be mixed uniformly and evenly, and a homogeneous, low-density wood fiber molding can be obtained. Furthermore, when gelatinizing a water-based adhesive, the water absorbed by the polymer particles is gelatinized by the combined heating of water vapor from the outside and high frequency from the inside. The water-based adhesive can be gelatinized in a shorter time than in the case of heating, and the running cost is very low.

In the above embodiment, the low-density wood fiber molding molded by the doctor blade (4) is heated together with steam and high frequency by the steam / high frequency heater (5), as shown in FIG. A low-density wood material formed by a doctor blade (4) with a press molding machine (27), if necessary, by providing a press molding machine (27) between the doctor blade (4) and the steam / high-frequency heater (5). After pressing the fiber molded body, the steam / high frequency heater (5) may be used to simultaneously heat the steam with steam.

When it is desired to further shorten the production time of the above-mentioned low-density wood fiber molding, a conveyor (3), a doctor blade (4), a press molding machine (2)
7), a steam / high frequency combined heater (5), a hot air dryer (6), etc. are housed in a high temperature and high pressure container, and heating, gelatinization and drying of the water-based adhesive are performed in a high temperature and high pressure atmosphere in the high temperature and high pressure container. Just go. Further, in the above-mentioned embodiment, the case of producing a flat plate-shaped low density wood fiber molded body has been described, but by providing an arbitrary molding means instead of the doctor blade (4), the low density wood fiber of any shape is provided. A molded body can be manufactured. For example, in the case of molding a packing material, a large number of molded bodies (28) formed in a predetermined shape by a wire net as shown in FIG. 4 are prepared, and the raw material mixer (1) is directly fed into the molded bodies (28). The mixture (A) is packed using the air flow, heated by steam and high frequency combined heater (5) with steam and high frequency to heat and gelatinize, and then hot air is dried by hot air dryer (6). The packaging material is manufactured by drying.

[0021]

As described above, since there is used the raw material mixer in which the spiral guide is provided in the main body of the cylindrical mixer to swirl and mix the various raw materials in a spiral shape, there is a certain order. It is possible to surely mix the materials of the low-density wood fiber molding, and moreover, it is possible to obtain a low-density wood fiber molding that is homogeneous and can be mixed uniformly and has excellent strength characteristics. The equipment can be downsized, and the equipment space and equipment cost can be significantly reduced. Also, since the water-based adhesive is heated and gelatinized by the combined use of steam and high frequency, it is possible to heat and gelatinize the water-based adhesive in a shorter time than heating by high frequency alone, and the running cost is low. A low-density wood fiber molding can be provided at low cost.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an apparatus for producing a low density fiber molded body according to the present invention.

FIG. 2 is a detailed view of a raw material mixer.

FIG. 3 is a schematic configuration diagram showing another embodiment of the low-density fiber molded body manufacturing apparatus according to the present invention.

FIG. 4 is a perspective view of a molded body used for manufacturing a packaging material.

[Explanation of symbols]

 1 Raw material mixer 2 Mixer supply feeder 3 Conveyor 3a Conveyor section 4 Doctor blade 5 Steam / high frequency combined heater 6 Hot air dryer 7 Mixer body 8 Spiral guide 9 Lower blast pipe 10 Middle blast pipe 11 Upper blast Tube 12 Blower 13 High-pressure water jet nozzle 14 Injection tube for super absorbent resin 15 Blower 16 Injection tube for water-based adhesive 17 Blower 18 Injection tube for wood fiber 19 Transfer tube 20 Mixer collector 21 Steam duct 22 Electrode plate 23 Electrode plate 24 heater 25 blower 26 hot air duct 27 press molding machine 28 molding A mixture

Claims (1)

[Claims] 1. A cylindrical mixer main body is internally provided with a spiral guide, and a plurality of blower pipes provided with a blower and a raw material feeding pipe are connected from below to the middle of the mixer main body, and mixing is performed. A raw material mixer in which a mixture collector is connected to the upper end of the main body of the vessel via a transfer pipe, and the raw material mixer is connected to the raw material mixer, and is fed from the raw material mixer in the raw material mixer. A supply feeder for supplying the material of the low-density wood fiber molded product according to the required amount, a molding means for forming the material supplied from the mixture supply feeder into a predetermined shape, and a predetermined shape by the molding means. Steam / high-frequency combined heater for heating / gelatinizing the formed low-density wood fiber molded body, and hot air for drying the low-density wooden fiber molded body heated / gelatinized by the steam / high-frequency combined heater with hot air It is composed of a drier, and after mixing various raw materials in the raw material mixer at a predetermined mixing ratio, it is supplied to the molding means by the supply feeder to form a predetermined low-density wood fiber molded body, and this is formed. The water contained in the water-containing adhesive is heated by heating with steam and high-frequency in combination with the steam / high-frequency combined heater to gelatinize the water-based adhesive, and the gelatinized water-based adhesive is dried in hot air with the hot-air dryer. An apparatus for manufacturing a low-density wood fiber molded product, which is configured to manufacture a low-density wood fiber molded product having a predetermined shape.