JPS62134212A - Manufacture of wooden series molded body - Google Patents

Abstract

PURPOSE:To contrive the reduction of manufacturing cost as well as to improve the strength characteristics of a molded body by a method wherein material, supplied from one direction, is sucked into a configurating member to aggregate and form it and the outer peripheral side of the configurating member is divided into a plurality of suction chambers while the chambers are evacuated sequentially from the most far chamber from the supply port of the material. CONSTITUTION:An upper case 23 is set above a lower case 22, shutters 33, 34 are lifted up to form the aggregating space 35 of the aggregated body of material by configurating members 25, 30 while forming material B2, metered by a constant amount, is sent by pressure to supply it through a pressure sending pipe 21. A suction fan 29 is operated and valves V1, V2, V6 are opened to evacuate the divided chambers 26a, 26b of a suction chamber 26 located at the most far side from the material supplying port 36 of the aggregating space 35 and the divided chamber 31a of the suction chamber 31 while the most far side of the space 35 is filled with the material. A sensor 41 detects it and the valves V3, V7 are opened to fill the material, then, the sensor 42 detects it and next valves V4, V8 are opened, thus, the material of a predetermined amount is filled up to the place whereat the sensor 44 is installed, thus completing the aggregated body B2.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for producing a wood-based molded article, and particularly to a method for producing a direct compression molded article using a molding material made of wood fibers.

(Prior art) In general, wood Im fibers are formed by defibrating chips such as wood chips using a defibrating machine, and a binder such as a synthetic resin is added to this to form a molding mat to be described later. Hard wood-based molded bodies (so-called hardboards) obtained by hot-press molding are widely used as materials for construction and furniture.

Conventionally, in order to manufacture the above-mentioned wood-based molded body, first, a molding material serving as a raw material is manufactured using a fibrillator 1 shown in FIG. What is the manufacturing process for this material?

Wood chips C are put into a hopper 2 of a fibrillator 1, and a screw feeder 3 provided at the bottom of the hopper 2 supplies the chips C to a steaming tank 4. Steam S is supplied from the top of the steaming tank 4 to soften the chips C so that the fibers are easily separated, and then the chips C are fed through the bottom of the tank 4 to the defibration disk 6 by the screw feeder 5. , are rubbed together by a fibrillation disk 6 driven by a motor 7, and fibrillated into wood 1fItamWl. This defibrated wood fiber is old.

It is supplied by the pressure feeder 7 via the pressure feed pipe 8 to the dryer IO shown in FIG. This dryer 1O uses the hot air H supplied from the dryer 11 to dry the above-mentioned wet wood #JIla.
After drying Wl in a meandering drying tube 12, it is supplied to a cyclone 13, and hot air containing moisture A and fine powder are removed by this cyclone 13. In this way, 5-4
This zero-order wood m fiber W2, which yields a woody laa'd2 of about 0rsta, is fed to the supply port 1 of the stirrer 15 shown in FIG.
6, and from the plurality of spray nozzles 17, 1 to 5% of water resistance agent (paraffin) and adhesive (thermosetting resin such as phenol resin or thermoplastic resin) etc. as a binder. About 10% of the material is supplied, and about 17% of hemp!a male is added to strengthen the material, and about 7% of polypropylene fiber etc. is added as a thermoplastic resin necessary for matting.
These are uniformly mixed and stirred by the rotating stirring blade 18, and a wood-based molding material B1 is obtained from the outlet 1θ.

Next, the above-mentioned material B1 is supplied to a molding mat material manufacturing device (not shown), etc., and is molded to a certain standard size.
A molding mat having a thickness of 0 to 40 mm is produced.

This molding mat is made of the above-mentioned raw materials, the wood fibers and 1m of hemp, pressed together and stored.

Since it is easy to transport and handle, it is stored in this way and transported in a matted state when necessary.

In order to produce a wood-based molded article using the above-mentioned molding mat, the mat material is cut into a shape that is slightly thicker than the shape of the completed molded article, for example, an automobile door trim, and then fed into a mold for hot-pressure molding. Then, compression molding is performed using this mold to obtain a molded article such as a door trim. At this time, if the material forming the molding mat contains a large amount of wood mm1, the mat may not be arranged in the side shape, but may protrude from one or both sides of a flat plate such as the armrest part of a door trim. Because sufficient deep drawability of the uneven portion (hereinafter referred to as the deep drawing portion) cannot be obtained, the forming mat is softened with steam, etc., and then preformed using a preforming die to form the desired shape. , molding was performed by following the shape of the hot press mold.

(Problems to be Solved by the Invention) However, the above-mentioned conventional method for manufacturing a wood-based molded article has the following problems.

First, molding mats were formed using materials such as wood fibers as an intermediate form of molding material to facilitate storage, transportation, and other handling. There was a problem in that the manufacturing process was complicated and workability was poor because it required a cutting process. Further, in the cutting process, since the mat is formed to be somewhat thick, there is a cut-off portion, which wastes material and has the problem of poor product yield.

Furthermore, to make the material into a mat, an extra thermoplastic resin binder is required, and in order to further improve deep drawability, long fibers such as hemp, which is expensive as a raw material, must be used as the mat material in addition to wood am. Thermoplastic net is required, linen #J
When II fibers are used, it is necessary to add an extra thermosetting resin component, which also poses a problem of high costs.

In addition, if the material contains a large amount of wood fiber, the mat must be softened with steam and preformed into the shape of the molded object in order to improve deep drawability, which not only increases the number of processing steps but also requires drawing. During processing, the corners where the mat is stretched become thinner, and if this preform is fed into a mold and compression molded as is, the thinner corners will have a lower density and the depth of the finished wood-based molded product will be reduced. Another problem was that the strength of the corners of the constricted portion was reduced. Incidentally, a similar problem occurs in the case of wood fiber lI & 85%, and after reinforcing the material by bringing it into contact with the protruding corners of the deep drawn part in a so-called patching manner with a material similar to the material that formed the mat. I tried to do hot pressure molding.

By the way, recently, in order to solve the above-mentioned problems all at once, the inventors of the present invention formed a low-density material aggregate using the above-mentioned molding material made of wood fibers, and We have proposed a method for manufacturing wood-based molded products in which the material is directly supplied into a mold and directly hot-pressed without passing through a molding mat (unknown, patent application 1980-230).
483), the aggregate formed from this molding material is different from the molding mat described in detail above, and has an extremely low density, a light bulk specific gravity of 0.008 to 0.05, and the same thickness. 50mm to 300mm despite forming a molded body
It is relatively thick, and the binding state of the woody m-fibers is not very strong, just to the extent that they are intertwined.

However, even in such a manufacturing method using a material aggregate, it is difficult to ensure that the aggregate has the desired shape when forming a thick part corresponding to the deep drawing part by various methods such as lamination suction. It is difficult to form, and also when feeding the formed material aggregate to a mold for hot press molding.

The thick part of the aggregate may be deformed, the density may be uneven, or the position may be misaligned when placed in the forming plate.
There was a problem in that a fragile portion was formed in the molded product after hot-pressing, resulting in a decrease in strength.

The present invention was made in order to solve the various problems mentioned above, and it is possible to directly feed a material aggregate made of wood-based material into an irregular shape to a mold without causing any deformation or positional displacement. The aim is to improve workability, reduce production costs by increasing product yield, and improve the strength characteristics of molded bodies, especially those with deep drawing parts, by manufacturing wood-based molded bodies. .

(Means for Solving the Problems) A feature of the method for producing a wood-based molded article according to the present invention for achieving the above object is that a wood-based molded product is produced by adding a binder containing a synthetic resin to wood fibers and stirring the mixture. In a method for producing a wood-based molded article, in which a low-density material aggregate is first formed using a raw material, and then this material aggregate is directly supplied into a mold and hot-press molded, the material aggregate is When forming, the above-mentioned materials supplied from one direction are collected and formed by suction into a layered member formed into an irregularly shaped aggregate shape, and the outer circumferential side of the shaping member is subjected to a plurality of suctions. The chamber is divided into chambers and the material is suctioned sequentially from the farthest part of the supply port.

(Function) It is possible to produce a wood-based molded product simply by going through the steps described above, so you can form a molding mat using a material such as #a wood, or cut this molding mat. In addition, there is no need to add a binder for matting, a length of hemp to improve deep drawability, a thermoplastic resin net, a thermosetting resin, etc. can be reduced.

In addition, even when producing a compression molded body having a deep drawn part, hot pressure forming of the yarn is carried out to prevent the so-called shoulders, which are the protruding corners of the deep drawn part, from becoming thin or brittle. In this case, there is no need to perform preforming or reinforcement work such as so-called patching, and it is possible to make the density of each part of the molded body uniform and perform hot-press molding.

At this time, even when conveying the material assembly in which the materials are laminated or aggregated into a shape having a thick portion corresponding to the molded body to the hot-pressing mold, the shape and density of the material assembly are kept constant. Since the material can be suctioned and supplied to the side forming mold that is held, even when forming a deep drawing part on the molded product, the so-called shoulders etc. are provided with a material of a predetermined density, which prevents the molded product from being fragile. can be prevented.

(Example) Hereinafter, an example of the method for manufacturing a wood-based molded article according to the present invention will be described in detail with reference to one drawing.

FIG. 1 and FIG. 2 illustrate one embodiment of the present invention.
The same reference numerals as in FIGS. 3 to 5 indicate the same or corresponding members.

Regarding the process of manufacturing the wood-based materials that serve as raw materials, please refer to Part 3.
Since this method is substantially the same as the conventional method explained using FIGS.

First, a chip C such as a piece of wood is
is defibrated to produce wood fibers.

The steps up to the steps of supplying this wood fiber Wl to the dryer 1O shown in FIG. 4 and drying it and supplying this dried wood filiW2 to the agitator 15 shown in FIG. 5 are the same as in the conventional method. The difference is that when stirring with the stirrer 15, there are multiple spray nozzles! These are the materials and amounts added to the dry wood edge @'d2 from 7.

The water resistance agent' (e.g. paraffin) is approximately the same as before, 1 to 5%.
However, since matting is not performed in the present invention, the amount of adhesive (thermosetting resin such as phenolic resin or thermoplastic resin) as a binder is 2 to lθ%.
(preferably 5%).If you stir it thoroughly at this rate and mix it uniformly, woody la, 111
A molding material Bl mainly composed of is completed and can be stored in this state if necessary.

Next, the process of forming a material aggregate using the molding material B1 will be explained using FIG. 1. The aggregate manufacturing apparatus 20 shown in FIG. 1 is provided at the open end of a pressure feed pipe 21 that communicates with a pressure feed mechanism (not shown), and is roughly constituted by a lower case 22 and an upper case 23. The lower case 22 is a shaped member made of wire mesh or the like that is given a curved surface shape at an arbitrary point in order to gather the material in a thick shape so as to correspond to a deep drawing part such as an armrest part of an automobile door trim. 25 and a suction chamber 26 formed on the outer side of the shaping member 25.
A plurality of divided chambers 28a, 28b, 2 are formed by a plurality of partition plates 27 corresponding to the curved surface forming portions of the shaping member 25.
Etc, 28d, 28e. As shown in the simplified diagram, each of the divided chambers 28a to 28e is connected to a suction pipe 28, respectively.
The valves v1 to 28e correspond to the divided chambers 28a to 28e, respectively.
v5 is provided. The suction pipes 28 are each connected to a suction fan 29.

Like the lower case 22, the upper case 23 also includes a shaping member 30 having a shape corresponding to the upper surface shape of the material assembly, and a suction chamber 31 provided on the upper side of the shaping member 30. Similarly to the suction chamber 28, this suction chamber 31 is also provided with a plurality of partition plates 32 according to the curved surface forming portion of the shaping member 30.

It is divided into divided chambers 31a to 31d. This divided room 3
1a to 31d are also connected to a suction v28 in the same way as the lower case 22, and this suction pipe 28 is also provided with valves v6 to v8, and these suction pipes 28 of the upper case 23 are also connected to a suction vacuum pump 28. ing.

Shutters 33 and 34 driven by a drive mechanism such as a rack 32 are provided before and after the material supply path of the material gathering space 35 formed by the shaping members 25 and 30, that is, on both sides of the upper case 23 in FIG. ing.

The process of forming a material aggregate using the aggregate manufacturing apparatus 20 having the above configuration will be explained.

First, as shown in FIG. 1, the upper case 23 is set above the lower case 22, the shutters 33 and 34 are lifted upward, and the gathering space 35 for the material assembly is formed by the shaping members 25 and 30. Then, a predetermined amount of weighed molding material B2 is fed and supplied to this gathering space 35 through the pressure feeding pipe 21. At the same time, the suction fan 29 is turned on and the valve V
l, V2. The divided chamber 28 of the suction chamber 2B is located on the farthest side from the material supply port 36 of the gathering space 35 when V13 is opened.
a, 28b and the divided chamber 31a of the suction chamber 31 are evacuated, so that the farthest side of the gathering space 35 is filled with the material. Inside the gathering space 35, sensors 41 to 44 for detecting the filling amount are provided in order from the back side.

When the material is filled on the back side, sensor 4! is valve V3. V
7, both valves are opened, and a portion of the collection space 35 that is somewhat close to the supply port 3B is filled with the material.
This filling amount is also detected by the sensor 42 and the primary valve V4.
V8 is opened to draw suction from the divided chambers 26d and 31c, and the material is also filled during this time. In this way, when a predetermined amount of material is filled up to the location where the sensor 44 is installed, the assembly B2 is completed.

To explain the process of disposing the material assembly B2 formed in this way in a hot-pressing mold, first, the rack 32 is rotated by a drive mechanism (not shown), and the shutter 3
3. 34 moves downward to form a side wall on the upper case 23 and regulates the supply port side and the farthest supply side of the material assembly B2. Then, the shutters 33 and 34 are closed. Then, valves v6 to v9 are opened, and the suction fan 28 is turned on.
is driven again to separate the divided chambers 31 through each suction pipe 28...
When the upper case is raised while suctioning a to 31d, the second
As shown in the figure, the assembly B2 is held by the upper case 23 with its upper surface in close contact with the shaping member 30 of the upper case 23. Thereafter, the assembly B2, which is moved between the lower mold and the upper mold of the mold (not shown) by a drive mechanism (not shown), is moved by stopping the suction in the suction chamber 31 of the upper case 23. , is dropped and positioned within the lower die of the mold.

As described above, the material assembly B2 set in the hot-pressing mold is heated and pressurized at a constant temperature and pressure, and is completed as a compression-molded body.

It should be noted that what has been described above merely shows one embodiment of the present invention, and any modifications or changes may be made without departing from the purpose, structure, and effects of the present invention.

For example, the description has been made assuming that sensors 41 to 44 for detecting the filling amount are provided to detect whether or not the material 81 is placed between the corresponding upper and lower divided chambers of the upper and lower cases 22 and 23. 1 The present invention is not limited to this, but the supply pipe 21
Every time a certain period of time elapses after pressure feeding of the material starts from , the divided chamber 27.
The valves V may be closed sequentially starting from 31, and the time may be managed using a timer or the like, and the material assembly may be formed.

In addition, in the above embodiment, the valves are opened from the farthest side, and when filling is completed, v1 to v
Although the description has been made assuming that all the valves Vl.9 are in the open state, the present invention is not limited to this.
, V2, and Vfl are opened to aspirate the material B1 to complete filling the innermost part, and then the valve V2. At the same time as V8 is closed, valves V3 and V7 are switched to open to fill material B1 into a portion somewhat closer to the supply port 3B than the innermost part, and then valves V3 and V7 are sequentially closed and valves V4. V8 is opened and opened at the same time, and valves V4 and V8 are closed and valve V5. Switch valve V9 open and open at the same time, and finally switch valve V5. Filling of the material B1 into the collection space 35 may be completed with Vl being changed from open to closed. At this time, air flows from the supply port 3B to the innermost part in the collection space 35. Valve v1 shall always remain open so that it is always formed. In this way, by closing the valves at the portions that have already been filled, it is possible to increase the suction force at the desired filling portions, and to save the driving energy of the suction fan, which is a unique effect.

(Effects of the Invention) As described above in detail, according to the method for manufacturing a wood-based molded article according to the present invention, a low-density material aggregate is first formed using a wood-based molding material. Next, in a method of manufacturing a wood-based molded article by directly supplying this material aggregate into a mold and compressing it, the above-mentioned material is fed from one direction when forming the material aggregate.

The material is collected and formed by suction through a shaping member formed into an irregular aggregate shape, and the outer circumferential side of the shaping member is divided into a plurality of suction chambers to the farthest side of the material supply port. Since the suction is performed sequentially from

■ The wood fiber material supplied from one direction is sucked through the shaping member, and the divided suction block formed on the outer circumferential side of the shaping member sucks it from the farthest side of the material supply port to collect the aggregate. Since it is assembled and formed, even if it is a molded object with a complex shape, it is possible to assemble and form the corresponding irregularly shaped material aggregate into the desired shape, improving workability and making it easier to form after completion. Good reproducibility of the body can be maintained.

■ Moreover, since it is possible to directly feed the aggregate into the mold while maintaining the suction state when forming the aggregate, it is possible to reduce the shape and layering of the aggregate during transportation and the density of the aggregate when placing the mold. It is possible to prevent misalignment of the molded product due to such factors, and it is possible to prevent molding defects of the molded product caused by these factors.This also improves workability and improves the strength characteristics of the molded product that has a deep drawing part. You can improve your performance.

■ Conventionally, when forming a wood-based molded article, it is possible to completely omit the manufacturing stage of mat material for molding as an intermediate processing form and the steps of steam softening this mat material and preforming it. This eliminates the need for thermoplastic resin for matting, and eliminates the need for long fibers such as hemp and thermoplastic resin nets for deep drawability, simplifying the manufacturing process and reducing costs. be able to. Furthermore, even if it is necessary to form a deep-drawn part in any part of the molded product, it is possible to form a deep-drawn part in the specified position without patching the so-called shoulders, etc., which may become weak in terms of strength. Strength can be guaranteed.

[Brief explanation of drawings]

FIG. 1 and FIG. 2 illustrate one embodiment of the present invention.
Figure 1 is a schematic cross-sectional view showing the manufacturing process using a manufacturing jig for assembling and forming a material aggregate, and Figure 2 shows the process of conveying the aggregate to a mold using the upper case of the jig. FIG. In addition, Figures 3 to 5 explain the process of manufacturing wood mai, and Figure 3 is a schematic perspective view showing a fibrillator, Figure 4 is a schematic configuration diagram showing a dryer, and Figure 5 is a schematic perspective view showing a fibrillator. FIG. 2 is a partially cutaway perspective view showing the stirrer. 20...Material assembly manufacturing device, 22...Lower case,
23...Upper case, 25.30...What shape member, 2E
l, 31... Suction chamber, 28a to 28e, 31
a to 31d-divided chamber, 28...suction tube, Vl-V
9...Valve, B2...Material aggregate.

Claims (1)

[Claims] (1) First, a low-density material aggregate is formed using a wood-based molding material made by adding a binder containing synthetic resin to wood fibers and stirring the mixture, and then this material aggregate is directly placed into a mold. In a method for producing a wood-based molded body in which the material is supplied and then hot-press-formed, when forming the material aggregate, the material supplied from one direction is shaped to correspond to the shape of the irregularly shaped aggregate. The wood material is collected and formed by suction into the material, and the outer peripheral side of the shaping member is divided into a plurality of suction chambers, and the material is suctioned sequentially from the farthest side of the material supply port. Method for producing a molded body.