JP3066135B2 - Manufacturing equipment for low density wood fiber moldings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a low-density (0.5%)
To 0.05) An apparatus for producing a wood fiber molded body.

[0002]

2. Description of the Related Art A low-density wood fiber molded article used in a wide range of fields such as packing materials, heat insulating materials, and shock absorbing materials is composed of a polyacrylic hydrochloric acid-based polymer, which contains a large amount of water and is formed into a fine particle, by using water as a solvent. By adding and mixing a water-based adhesive in the form of a powder, the water-based adhesive is adhered to the entire surface of the polymer particles, added to the dried wood fiber, and uniformly mixed using compressed air. The mixture is formed into various shapes and heated by microwaves to generate water vapor from the water absorbed in the polymer particles, the adhesive is gelatinized by the water vapor, and the gelatinized adhesive is dried. It is manufactured by bonding wood fibers together.

[0003]

By the way, in the production of the low-density wood fiber molded article, various raw materials using compressed air, that is, a polyacrylic hydrochloric acid-based polymer which contains a large amount of water and is formed into fine particles, water A uniform air flow is required to uniformly mix the powdery water-based adhesive and the dry wood fiber using as a solvent, for example, an existing air-flow mixer that moves with a linearly moving air flow It is very difficult to create a uniform air flow in this case, and as a result, various raw materials cannot be mixed uniformly without unevenness.
There was a problem that the finished product was not homogeneous. In order to obtain a uniform mixing state, mixing in a large-capacity mixing chamber has been attempted.However, since the mixing of various raw materials cannot be performed at once, the mixing pipe is not used in existing air-flow mixers. Therefore, there is a problem that a large space is required. Also,
The water absorbed in the polymer particles is heated by microwaves to generate water vapor to gelatinize the water-based adhesive, but this takes time to gelatinize the water-based adhesive. In addition, since the mixing of various raw materials is uneven, the distribution of water is also uneven, and the gelatinization state of the water-based adhesive becomes uneven, so that a uniform low-density wood fiber formation cannot be obtained. Further, there is a problem that the running cost is increased by using the microwave alone, and the manufacturing cost is increased.

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned problems, and it is possible to obtain a low-density wood fiber molded article having uniform strength and excellent strength characteristics in a short time, and at the same time, to be compact and take up little space. An object of the present invention is to provide an apparatus for manufacturing a dense wood fiber molded article.

[0005]

According to the present invention, in order to achieve the above object, a spiral guide is provided in a cylindrical mixer main body, and a blower and a raw material are charged from below to the middle of the mixer main body. A plurality of blower tubes provided with pipes are connected, and a raw material mixer in which a mixture collector is connected via a transfer pipe to an upper end portion of the mixer body, and a raw material mixer connected to the raw material mixer 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 a required amount, and forming the material supplied from the mixture supply feeder 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 producing a low-density wood fiber molded article of the present invention, various raw materials are uniformly mixed at a predetermined mixing ratio in the raw material mixer to form a material of the low-density wood fiber molded article. This is supplied to the molding means by the supply feeder to form a low-density wood fiber molded article of a predetermined shape by the molding means, and this is heated by steam and radio frequency combined heating by a steam / radio frequency combined heater. The water-based adhesive is heated to gelatinize the water-based adhesive, and the gelatinized water-based adhesive is dried with hot air using a hot-air dryer to bond the wood fibers to each other to produce a low-density wood fiber molded product.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an apparatus for producing a low-density wood fiber molded article according to the present invention.

FIG. 1 is a schematic structural view of an apparatus for producing a low-density wood fiber molded article 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 above-mentioned raw material mixer (1) is a spiral guide (rotated at an appropriate speed by a rotation driving means (not shown) in a cylindrical mixer body (7)). 8) is arranged, and three blower tubes (9) (10) (11) are connected at an arbitrary interval below the middle portion of the mixer body (7). The lower blower tube (9) has a blower (12) attached to the end, and connects a nozzle (13) for spraying mist-like high-pressure water and a charging tube (14) for charging the superabsorbent resin in the middle. ing. The blower tube (10) at the middle stage has a blower (15) attached to the end, and is connected to a feed pipe (16) for feeding a powdery water-based adhesive using water such as starch as a solvent in the middle. . The upper blower tube (11) has a blower (17) attached to the end, and is connected to a feed pipe (18) for feeding dry wood fiber in the middle. A transfer pipe (19) is connected to the upper end of the mixer body (7), and a mixture collector (20) such as a cyclone dust collector is attached to the transfer pipe (19). Therefore,
The blower (12) of the lower blower tube (9) and the blower (1
The air flow is generated by the blower (15) of (0) and the blower (17) of the upper blower tube (11), and is sent into the mixer main body (7) while being sprayed from the nozzle (13). Water is injected into the lower blower pipe (9), and the charging pipe (14)
(16) (18) Higher water-absorbent resin, water-based adhesive, and dried wood fiber are blown into respective air ducts (9) (10)
Input to (11). Then, first, atomized high-pressure water injected from the high-pressure water injection nozzle (13) and superabsorbent resin injected from the superabsorbent resin injection pipe (14) are guided in the mixer body (7). The polyacrylic acid-based polymer gradually rises while spiraling along (8), and in the meantime, atomized high-pressure water is absorbed by the superabsorbent resin to form fine particles containing a large amount of water. Then, the polymer and a powdery water-based adhesive made of, for example, starch or the like supplied from a water-based adhesive charging pipe (16) are passed along the guide (8) in the mixer body (7). It gradually rises while helically circling, during which time a water-based adhesive adheres to the entire surface of the polymer to form a polymer. Further, the polymer and the dry wood fiber fed through the wood fiber feeding pipe (18) Guides inside the mixer body (7) While gradually rising while spirally rotating along (8), a mixture (A) which becomes a material of a low-density wood fiber molded article by uniformly mixing the polymer and the dried wood fiber is formed, When the mixture (A) reaches the upper end of the mixer 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 of the low-density wood fiber molded product, and the air stream is released to the atmosphere.

[0010] The mixture supply feeder (2) is connected to a 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 transport section (3a) of the transport conveyor (3) according to the required amount.

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

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

[0013] The combined steam / high frequency heater (5)
A steam duct (21) is arranged above the transport section (3a) of the transport conveyor (3), and the electrode plates (22) and (23) are moved up and down with the transport section (3a) of the transport conveyor (3) interposed therebetween. The high-pressure and high-pressure steam from the steam supply means (not shown) is sprayed from a steam duct (21), and the high-frequency generation means (not shown) is provided on both electrode plates (22) and (23). Electromagnetic wave from the two electrode plates (22)
By generating high frequency during (23), the mixture (A) placed and transported on the transport section (3a) of the transport conveyor (3) is heated using both steam and high frequency.

In the hot air dryer (6), a hot air duct (26) to which a heater (24) and a blower (25) are attached is provided below the transport section (3a) of the transport conveyor (3). By blowing hot air warmed by a heater (24) by a blower (25) from this hot air duct (26),
The mixture (A) placed and transported on the transport section (3a) of the transport conveyor (3) is dried with hot air.

Next, the procedure for producing a flat wood fiber molded product in the apparatus for producing a low density wood fiber molded product having the above-described structure will be described.

First, in a raw material mixer (1), various raw materials are mixed at a predetermined mixing ratio (for example, water: superabsorbent resin: water-based adhesive:
Wood fiber = 30: 1: 1: 5) is uniformly mixed to form a mixture (A) which is a material for a low-density wood fiber molded product. That is, the lower blast tube (9), the middle blast tube (10) and the upper blast tube (11) of the raw material mixer (1).
By driving each of the blowers (12), (15), (17) to generate an air flow, while sending this air into the mixer body (7),
The high-pressure water injection nozzle (13) injects high-pressure water in the form of a mist into the lower blower pipe (9), and the injection pipes (14) (16) (1
8) When the superabsorbent resin, the water-based adhesive and the dried wood fiber are put into the respective blower pipes (9), (10), and (11), first, the atomized spray injected from the high-pressure water injection nozzle (13) High-pressure water and superabsorbent resin introduced from the superabsorbent resin inlet pipe (14) guide the mixer body (7) inside the mixer body (7).
While gradually rising while spiraling along the, the polyacrylic acid-based polymer in the form of fine particles containing a large amount of water absorbed in the form of mist in the superabsorbent resin is formed,
Thereafter, the polymer and a powdery water-based adhesive made of, for example, starch or the like, which are fed from the water-based adhesive charging pipe (16), spirally move along the guide (8) in the mixer body (7). While gradually rising while turning, the polymer becomes a polymer in which a powdery water-based adhesive has adhered to the entire surface of the polymer,
Further, while the polymer and the dry wood fiber fed from the wood fiber feeding pipe (18) gradually rise while spirally turning along the guide (8) in the mixer body (7). Then, the polymer (A) is uniformly mixed with the dried wood fiber to form a mixture (A) which is a material of a low-density wood fiber molded product. When the mixture (A) thus formed reaches the upper end of the mixer body (7),
The mixture (A) is fed to the mixture collector (20) via the transfer pipe (19), where it is separated from the air stream, and the mixture (A) is supplied to the mixture collector (20) as a material of the low-density wood fiber molded product. As it is collected, the air stream is released to the atmosphere. Then, the mixture (A) collected by the mixture collector (20) as the material of the wood fiber molded body is sent to the mixture supply feeder (2). The mixture (A) may be further mixed with a mixer such as a rotary type or a tumbler type as needed, and then supplied to the mixture supply feeder (2).

The mixture (A) sent to the mixture supply feeder (2) is dropped and supplied onto the transport section (3a) of the transport conveyor (3) in accordance with a required amount, and is transported by the transport section (3) of the transport conveyor (3). 3a) It is placed and transported in a stacked state on top. Thereafter, 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). An excess amount of the mixture (A) conveyed is scraped off, and the thickness of the mixture (A) is made uniform to form a flat plate. When the mixture (A) is formed into a flat plate in this manner, the mixture is conveyed to the combined steam / high-frequency heater (5) by the conveyor (3), where the mixture is sprayed from the steam duct (21). Is heated in combination with the water vapor and the high frequency generated between the pair of electrodes (22) and (23). Then, since the inside of the low-density wood fiber molded body is heated by high frequency and the outside is heated by steam, the water absorbed in the polymer particles is heated by high frequency to generate steam, and the steam and the steam duct (21) The water-based adhesive is rapidly heated by the water vapor sprayed from the water, and gelatinizes the water-based adhesive adhering to the entire surface of the polymer particles. This is conveyed to a hot-air dryer (6) by a conveyor (3), and the gelatinized water-based adhesive is quickly dried by hot air blown from a hot-air duct (26) to perform flat air drying. A dense wood fiber molded product is obtained.

In the raw material mixer (1) in the apparatus for manufacturing a low-density wood fiber molded article of the embodiment of the present invention described above,
A spiral guide (8) is provided inside the cylindrical mixer body (7) so that the air flow circulates while swirling, so that various raw materials, that is, high-pressure water, high-pressure water, Water absorbent resin,
By sequentially feeding the water-based adhesive and the wood fiber, the materials of the low-density wood fiber molded article in order can be surely mixed. In addition, the equipment is downsized, and the equipment space and equipment cost are remarkably reduced. Be reduced.
In addition, since the materials are mixed while being swirled, various raw materials can be uniformly mixed without unevenness, and a low-density wood fiber molded product having a uniform and excellent strength characteristic can be obtained. Furthermore, when gelatinizing the water-based adhesive, the water absorbed by the polymer particles is steamed from the outside, and gelatinization of the water-based adhesive is performed by combined heating of the inside and the high frequency from the inside. The water-based adhesive can be gelatinized in a shorter time than in the case where heating is performed, and the running cost is very low.

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

If it is desired to further shorten the production of the low-density wood fiber molded body, a conveyor (3), a doctor blade (4), a press molding machine (2)
7) The steam / high frequency combined heater (5) and hot air dryer (6) are housed in a high-temperature and high-pressure container, and the 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 do it. Furthermore, in the above-described embodiment, the case where a flat low-density wood fiber molded body is manufactured has been described. However, by providing an optional forming means instead of the doctor blade (4), a low-density wood fiber having an arbitrary shape is provided. A molded article can be manufactured. For example, in the case of molding a packing material, a large number of compacts (28) formed in a predetermined shape by a wire mesh as shown in FIG. 4 are prepared, and the molded body (28) is directly fed from the raw material mixer (1). The mixture (A) is packed by utilizing the air flow, and the mixture is heated and gelatinized by using the steam and the high frequency combined heater (5) to heat and gelatinize the mixture, and then the hot air is dried by the hot air dryer (6). The packaging material is manufactured by drying.

[0021]

As described above, a spiral mixer is provided inside a cylindrical mixer main body, and a raw material mixer for mixing various raw materials while swirling them is used. The material of the low-density wood fiber molding can be surely mixed, and can be uniformly mixed without unevenness, and a low-density wood fiber molding having excellent strength characteristics can be obtained. The apparatus is downsized, and the equipment space and equipment cost can be significantly reduced. In addition, since the water-based adhesive is heated and gelatinized by combined heating of steam and high frequency, the water-based adhesive can be heated and gelatinized in a shorter time than the heating of high frequency alone, and the running cost is low. A low-density wood fiber molded article can be provided at low cost.

[Brief description of the 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 apparatus for producing a low-density fiber molded body according to the present invention.

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

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 raw material mixer 2 mixture supply feeder 3 transport conveyor 3a transport section 4 doctor blade 5 steam / high frequency combined heater 6 hot air dryer 7 mixer body 8 spiral guide 9 lower blower pipe 10 middle blower pipe 11 upper blower Pipe 12 Blower 13 High-pressure water injection nozzle 14 Input pipe for superabsorbent resin 15 Blower 16 Input pipe for water-based adhesive 17 Blower 18 Input pipe for wood fiber 19 Transfer pipe 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

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B27N 1/00-5/00

Claims (1)

(57) [Claims] 1. A spiral guide is provided inside a cylindrical mixer body, and a plurality of blowers provided with a blower and a raw material charging pipe are connected from below to the middle of the mixer body, and mixing is performed. A raw material mixer in which a mixture collector is connected to an upper end portion of the container body via a transfer pipe; and a raw material mixer connected to the raw material mixer of the raw material mixer and fed from the raw material mixer of the raw material mixer. A feeder for supplying the material of the low-density wood fiber molded article according to a required amount; forming means for forming the material supplied from the mixture supply feeder into a predetermined shape; forming the material in a predetermined shape by the forming means Steam / high-frequency heater for heating and gelatinizing the low-density wood fiber molded body thus obtained, and hot air for drying the low-density wood fiber molded body heated and gelatinized by the steam / high-frequency heater together After the various raw materials are mixed at a predetermined mixing ratio in the raw material mixer, the raw materials are supplied to the forming means by the supply feeder to form a predetermined low-density wood fiber molded body. The water contained is heated by the combined use of steam and high frequency by the above steam / high frequency heater to heat the contained water to gelatinize the water-based adhesive, and further, the gelatinized water-based adhesive is hot-air dried by the hot-air dryer. An apparatus for producing a low-density wood fiber molded product, wherein a low-density wood fiber molded product having a predetermined shape is produced.