JPS62134218A - Manufacture of wooden series molded body - Google Patents

Abstract

PURPOSE:To improve workability and lower manufacturing cost, increase the strength of a molded body and contrive the stabilizing of the configuration of the aggregated body of material as well as the uniforming of wood fibers by a method wherein wooden series molding material is scattered from an upper part to laminate and form the thick section of the aggregated body of material, which becomes the deep draw section of the molded body, while sucking the thick section, thereafter, the whole of the aggregated body of material is sucked to laminate and mold it. CONSTITUTION:In an aggregated body manufacturing device 30, material B1, supplied to a dispersing device 33, is scattered and laminated on a predetermined position by switching air blow-off ports 31a, 31a to left-and-right by switching a valve 43. The valve V1 is opened and the valve V2 is closed immediately after starting the scattering of the material B1 and the evacuation of only a divided suction chamber 37a is effected whereby the material B1 is laminated on only the inflated section 35a of a configurating member 35. When the material B1 is laminated to the height of a height sensor 40, suction is effected from suction pipes 38b, 38b also through the valve V2 and the aggregated body B2 is laminated under a condition that the upper surface thereof is flat, thereafter, the aggregating process of the aggregated body B2 is finished when another height sensor 41 has detected the lamination of the upper surface side of the material B1.

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 wood-based molding material.

(Prior art) In general, 1. For example, chips such as wood chips are defibrated using a defibrator or the like to form wood H&M, and a binder such as a synthetic resin is added to the wood fibers to form a molding mat as described below. This molding mat is then compression-molded using hot pressure molding, etc. to obtain a hard wood-based molded product, and this wood-based molded product is widely used as a material for construction and furniture as so-called hardboard. It's being used.

Conventionally, in order to manufacture the above-mentioned wood-based molded article, first, a molding material serving as a raw material is manufactured. The manufacturing process of this material is as shown in FIG.
The chips C are supplied to the steaming tank 4 by the following steps. 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 supplied to the fibrillation disk 6 by the screw feeder 5 on the bottom side of the tank 4, and the chips C are fed to the fibrillation disk 6 by the screw feeder 5 on the bottom side of the tank 4 The wood fibers are rubbed together by a defibrating disk 6 driven by a fibrillating disk 6, and are defibrated into wood fibers Wl. This defibrated Kiga fiber M1 old is supplied to the dryer 10 shown in FIG. 5 via the pressure feeding pipe 8 by pressure feeding 4'17'. This dryer IO uses hot air H supplied from a dryer 11 to dry the above-mentioned wet wood fibers Wl through a meandering drying tube 12, and then supplies it to a cyclone 13, which converts the wet wood fibers Wl into hot air containing moisture A. Removes fine powder. In this way, 5-40m+.

Next, the wood fibers W2 are fed to the supply port I6 of the stirrer 15 as shown in FIG.
water resistant agent (
1 to 5% of paraffin), 5 to 10% of adhesive (thermosetting resin such as phenolic resin or thermoplastic resin) as a binder, and hemp fiber for deep drawing. About 17% and about 7% of polypropylene fibers as a thermosetting resin necessary for making a cloak are added, and these are uniformly mixed and stirred by the rotating stirring blade 18, and the wood-based molding material is released from the outlet 19. B! get.

Next, using the material B1, a mat material for molding is manufactured using a mat manufacturing apparatus 20 as shown in FIG. This mat manufacturing device 20 is connected to a hopper 2 via a transport pipe 21.
Material Bl is supplied to hopper 22, and material E? is supplied from the bottom side of this hopper 22. 1 to deposit the material Bl on the conveyance belt 23a of the belt conveyor 23 that is being driven, and this deposited material B
1 is heated by the brake heater 24 provided above the conveyance belt 23a, and then the pressure rollers 25 and 25 provided above and below, respectively, are heated.
... to form a flat plate, and finally the hot pressure rollers 2fl, 2 provided on the feed side of the pinching roller 25...
The molding mat 27 is obtained by hot pressing from both the upper and lower surfaces using B. When manufacturing a molded article having a deep drawing part by compression molding using this molding mat 27, in addition to the above-mentioned wood fibers, hemp #a male for deep drawing molding, thermoplastic resin net, etc. are also added. If these are pressed into a pressed state, they can be easily handled during storage and transportation, so they are stored on the side of the mat and transported as needed.

To manufacture a wood-based molded product using the above-mentioned molding mat 27: 1. For example, when hot-pressing an automobile door trim, cut the molded product into a piece somewhat larger than the shape of the completed molded product, and then heat the molded product. Place it in a pressure mold and heat-press the wood-based molded product. At this time, if the raw material constituting the molding mat 27 contains a large amount of wood fiber, this mat 27
By placing it in the side mold, an uneven part (hereinafter such a shape is referred to as a deep drawn part) is formed that protrudes on one or both sides of a flat plate, such as the armrest part of a door trim.
Because sufficient deep drawability cannot be obtained, the molding mat is softened using steam, etc., and then preformed using a preforming mold to form a predetermined uneven shape so that it conforms to the shape of the hot pressure molding mold. was.

(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, in order to facilitate supply to the compression molding process, it was necessary to form a molding mat using a wood-based material and cut the mat into a predetermined shape, making the manufacturing process complicated and labor intensive. Not only is the properties poor, but when the mat is cut to be somewhat thicker than the finished molded product, the cut off portion is wasted, resulting in an increase in production costs. In addition, a binder is required to make the material into a mat, and to further improve deep drawability, the material for the mat needs to be long fibers such as hemp or thermoplastic resin net, which are expensive raw materials in addition to wood fibers. Therefore, when using hemp fiber, it is necessary to add an extra thermosetting resin,
In these respects as well, there was a problem that the cost was high.

In addition, if the material contains a large amount of wood tag, it is necessary to soften the mat with steam and preform it into the shape of the molded object in order to improve deep drawability, which not only increases the number of processing steps but also increases the drawing process. The corners of the stretched mat become thin, and if this preform is fed into a mold and compression molded as is, the thinned corners will have a low density, and the finished wood molded product will have a low density. Another problem was that the strength of the bent portion was reduced. Incidentally, a similar problem arose in the case of 85% wood fiber, and the same material as that used to form the mat was applied to the bent portions to reinforce it, in a so-called patching manner, and then compression molded.

By the way, recently, in order to solve the above-mentioned problems, the inventors of the present invention have formed a low-density material aggregate using a molding material made of wood fibers, and have directly molded this material aggregate into a mold. We have proposed a method for producing wood-based molded products in which the wood-based molded products are supplied to the wood and subjected to hot-pressure molding.
No. 3).

Unlike conventional mats, the aggregate formed from this molding material has an extremely low density, with a specific gravity of only 0.0.
It is light at 0.08 to 0.05, and has a thickness of 50 m to 300 cm, and the bonding state of the wood la, * is not very strong.

However, even in the manufacturing method using the above-mentioned material aggregate, although the molding material has some moisture in the process of forming the material aggregate, it has an extremely low specific gravity, so it remains constant. It takes a considerable amount of technology to form a uniform, low-density aggregate using a large amount of material into a certain shape 1, for example, the thick inside of the aggregate that becomes the deep drawing part of the molded body after molding. However, there was a problem in that a material aggregate having a desired density and shape could not be formed by simply assembling wood fibers randomly.

The present invention has been made to solve the above problems, and a material aggregate made of wood fibers formed into an irregular shape is directly supplied to a mold and compression molded to produce a wood-based molded article. In addition to improving workability and production costs and increasing the strength of the molded product, in the #a fiber lamination process, we aim to stabilize the shape of the material aggregate and make the wood m fibers uniform, reducing manufacturing costs. The aim is to make further improvements.

(Means for Solving the Problems) The method for producing a wood-based molded article according to the present invention for achieving the above object is characterized in that a wood-based molded article is produced by adding a binder containing a synthetic resin or the like to wood fibers and stirring the mixture. First, a low-density material aggregate is formed using a molding material, and then this material aggregate is directly supplied and arranged in a mold, and then hot-press molded to produce a wood-based molding having a deep drawing part. In the method for manufacturing a molded body, when forming the material aggregate, the wood-based molding material is scattered from above a container for laminating material aggregates having a predetermined shape, and the The thick part of the material aggregate that will become the constriction part is suctioned to form a layer, and then the entire material aggregate is suctioned to form an aN, thereby forming a low-density, irregularly shaped material aggregate. It is in.

(Function) By going through the above process, it is possible to manufacture a wood-based molded product, so it is possible to form a molding mat using materials such as wood fibers and fibers, and to cut this molding mat. In addition, it is possible to omit the process of forming a mat, and to use a binder to create a mat, long fibers such as hemp to improve deep drawability, etc.
Addition of thermoplastic resin net, 8 curable resin, etc. can be unnecessary or reduced. In addition, even when deep drawing is performed to produce a compression molded product having deep drawn parts, each part of the molded product can be easily adjusted without forming a preform or performing reinforcement work such as so-called patching. Density can be made uniform.

Furthermore, when using wood fibers to form a wood-based molded body having, for example, a deep-drawn part, it is necessary to form the material aggregate into a predetermined shape in advance, but as described above, By going through an aggregate formation process, wood fibers in a floating state with low specific gravity are sucked from below, and first, the inside of H, which will be the deep drawing part after forming, is aggregated into the desired shape φ density. After that, the entire material can be sucked to form an irregularly shaped material aggregate, so that the shape of the aggregate can be stabilized and the density of the woody laminated material can be made uniform. Therefore, by performing hot-pressing molding using this aggregate, it is possible to exhibit excellent moldability, particularly in drawing processing of wood-based molded bodies having deep drawn parts, and to improve the yield.

Working as described above, it is possible to omit several steps compared to the conventional method, and it is also possible to provide an aggregate containing wood fibers uniformly in a stable shape, which improves workability during hot-press molding. In addition, even when deep drawing is performed, the density of the compact can be made uniform and the strength of the deep drawn part can be increased, and the yield can also be improved.

(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 the drawings.

1 to 3 are for explaining one embodiment of the present invention. FIG. 1 is a schematic cross-sectional view showing the process of forming the material assembly, and FIGS. 2 and 3 are for wood-based molding. FIG. 3 is a schematic cross-sectional view illustrating the steps of placing a material aggregate formed of raw materials in a hot-pressing mold and compression-molding them. Note that the same reference numerals as in FIGS. 4 to 7 indicate the same or corresponding members.

First, regarding the process of manufacturing the wood fiber that is the raw material,
Almost the same as the conventional method explained using FIGS. 4 to 6.
Therefore, only the differences will be explained and duplicate explanations will be omitted.

First, wood fibers Wl are produced by defibrating chips C such as wood chips using solution #t@1 shown in FIG. 4, and wood fibers W2 are produced by drying with the dryer 10 shown in FIG. , up to the process of supplying this wood fiber W2 to the agitator 15 shown in FIG. 6 are the same.

The difference is in the materials and amounts added when stirring in stirring 4'i15. A water-resistant agent (for example, paraffin) is added in an amount of about 1 to 5%, which is approximately the same as conventional methods, but since matting is not performed in the present invention, a binder and an adhesive (thermosetting resin such as phenolic resin) are added. It is only necessary to add about 2 to 10% (preferably 5%) of the thermoplastic/resin), and when mixed uniformly with sufficient stirring at this ratio, the molding material B1 mainly composed of wood fibers is completed,
It can also be stored in this state if necessary.

Next, a process of manufacturing an aggregate from the molding material B1 using the material aggregate manufacturing apparatus 30 as shown in FIG. 1 will be described.

First, the aggregate manufacturing device 30 includes a dispersion container 34 formed of a rectangular iron plate, for example, and a molding material B1 such as the above-mentioned wood fiber, which is provided on the lower side of the dispersion container 34.
It is generally constituted by a lamination container 32 in which the materials are laminated or deposited. Inside the spraying container 34, there is a pressure feeding pipe (
A sprayer 33 is provided for spraying the material Bl supplied through a sprayer (not shown), and a sprayer 33 is provided at the top of the spraying container 34 for regulating the spraying direction of the material B1.

An air blowing container 31 having air blowing ports 31a, 31a inside is provided. A fitting part 34a is provided between the scattering container 34 and the stacking container 32 to prevent the material B1 from spilling out to the surroundings when the material B1 floats and descends. Further, on the bottom side of the container 32 for the ablation layer, there is provided a lined member 35 made of wire mesh, punching metal, etc. that regulates the bottom shape of the aggregate, and a bulge formed by this lined member 35. 35a
The bottom side of the stacking container 32 surrounding the stacking container 32 is partitioned by a partition plate 36 into a divided suction chamber 3 corresponding to the bulged portion 35a. a and a divided suction chamber 37 corresponding to the other parts.
b, 37b are formed. The divided suction chamber 3
Suction pipes 38... are connected to 7a and 37b, respectively, and the suction chamber 3? A valve Vl is provided in the suction pipe 38a connected to the suction chamber 37b.

3? The suction pipes 38b and 38b connected to b are connected in the middle, and then connected to the suction pipe 38a via a valve v2, and then connected to a suction mechanism 38 such as a suction fan.

Further, a height sensor 40 is provided on the side wall of the laminated container 32 to detect when the molding material Bl is filled into the bulging portion 35a of the row member 35.
A height sensor 41 is provided on the upper side wall of 2 to detect the total amount of stacking of the assembly. In addition, the code|symbol 42 is an air supply pipe which supplies air into the spraying container 31, and the code|symbol 43 is the switching valve.

The process of forming a material aggregate using the aggregate manufacturing apparatus 30 having the above configuration will be explained.

First, open the switching valve 43 and open the air supply pipe 42.
The stacking container 3 is supplied with air into the air blowing container 31.
2, and on this air flow, the material B1 supplied to the above-mentioned sprayer 33 through a pressure feed pipe (not shown) is suspended by the air from the air outlet 31a of the air blowing container 31. In this state, it is lowered toward the bottom of the stacked container 22. The material B1 is scattered into the stacking container 32 from the scatterer 33, but at this time, the air blowing container 3
Since air outlets 31a, 31a are open inside the material B1, by switching the air outlets 31a, 31a to the left and right with a switching valve 43, or by closing both, the material B1 is moved to a predetermined position. They will be scattered and stacked. In addition, suction is performed by a suction mechanism 39 on the bottom side of the stacking container 32;
Immediately after the start of dispersing the material Bl, only the valve Vl is opened and the valve v2 is closed, so that suction is performed only in the divided suction chamber 37a of the suction chamber 37, and the material B1 is released from the bulge of the row member 35. Only the portion 35a will be subjected to Jltm. In this state, material is deposited, and material B1
When the stacking containers 32 are stacked up to the height of the height sensor 40 on the side wall of the stacking container 32, an opening signal is sent to the valve v2, and suction is also performed from the suction pipes 38b, 38b via the valve v2. When the materials Bl are gradually stacked in this state, the aggregate B2 is stacked with its upper surface flat, and one or a predetermined number of the height sensors 4... The side stack is detected and a signal is sent, the switching valve 43 is operated to stop the air supply, and all the height sensors 41 detect the stacked amount M of the material B1, and the material assembly B2 is assembled. will end.

When the stacking of the material assembly B2 is completed in the manner described below, it is supplied into the lower mold 48 of the thermoforming mold 45 shown in FIG. 2 by a transport mechanism (not shown). This hot-pressing mold 45 forms two molding spaces C1 by a lower mold 46 having a concave portion c1 and an upper mold 47 having a convex portion C2, and the lower and upper surfaces of both upper and lower molds 48 and 47 are A hot plate 48.48 heated by a heater and a temperature controller (not shown) is provided,
A holding plate 49 is provided on the outer peripheral side of the lower mold 46. Further, the upper mold 47 includes a suction hole 47a and a suction hole 47a.
A suction space 47b located on the upper side of the suction space 4? is formed, and this suction space 4? A suction pipe 50 that sucks the inside of the molding space C when the material aggregate B2 is pressed is connected to b via a valve 51.

As the upper mold 47 descends, the thermoforming mold 45 having the above-mentioned configuration
The valve 51 is opened to vent gas from the material assembly B2, and the wood-based molded body M is compression molded as shown in FIG. Note that, in this wood-based molded body M, a deep drawing layer is formed by the concave portions C1 and convex portions C2 of the mold.

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 and effects of the present invention.

For example, in the above embodiment, air is supplied from the upper side of the dispersion container 34 to feed the floating forming material into the aM container 35 side, and air is also sucked from the lower side of the lamination container 35 to form a material aggregate. Although the shape of the material has been described as being aligned with the linear member, the present invention is not limited to this, and the material is simply sprinkled from above without using air for feeding or suction for forming the shape. The assembly may be formed in a layered manner.By further simplifying the layering mechanism in this way, the unique effect of further reducing the equipment cost is achieved.

Further, in the above embodiment, the height sensor 40, 41 is provided on the side wall of the container as a method for managing the stacking of materials, but the present invention is not limited to this. For example, a timer circuit or the like may be provided. The stacking of materials may be managed based on time.

(Effects of the Invention) As described above in detail, according to the method for producing a wood-based molded article according to the present invention, a wood-based molding material obtained by adding a binder containing a synthetic resin or the like to wood fibers and stirring the mixture. First, a low-density material aggregate is formed, and then this material aggregate is directly supplied and arranged in a mold, and then hot-press-formed to produce a wood-based molded body with a deep drawing part. In the method of
When forming the material aggregate, the wood-based molding material is sprinkled from above the container for planting the material aggregate in a predetermined shape, and the thickness of the material aggregate, which will become the deep drawing part of the molded body, is Since the interior is laminated and then the entire material assembly is laminated, the following effects are achieved.

■ When forming the material assembly, first, the thick part of the material assembly that will become the deep drawing part of the molded body is laminated, and then the whole is laminated, so it is possible to form a material assembly with low density and irregular shape. It is possible to stabilize the shape of the body and also make the material density of the aggregate uniform, so when hot-pressing the material aggregate, it is possible to prevent defects in hot-pressing due to shape deviation of the material aggregate. This can be prevented, and the simple structure can improve workability and manufacturing costs.

■ The conventional manufacturing and cutting process of molding mats, so-called punching work, etc. can be omitted, and the transportation work of materials can also be simplified, so it is possible to
Workability and manufacturing costs can be significantly improved.

■ In addition, as mentioned above, cutting of the molding puttu and so-called patching work can be omitted, so raw materials can be saved by eliminating the waste of materials such as cut-off parts of the mat and patch materials that occur during cutting, and the product yield can be reduced. It is also possible to improve the

■ Furthermore, even if the molded body has a so-called deep-drawn part and there are many IA fiber parts in the wood-based material used as the molding material, it is possible to simply make the deep-drawn part of the material assembly into a thick-walled shape in advance. , can be immediately subjected to the compression molding process, does not need to be softened with steam or preformed like molding mats, does not require thermoplastic resin, etc. for matting, and has deep drawability. It is also possible to eliminate the need for fibers such as hemp, thermoplastic resin nets, etc. for obtaining the material, so that the manufacturing process can be simplified and costs can be reduced in these respects as well.

・In addition, unlike those manufactured using a manufacturing method that goes through a forming mat or a pre-formed body, the wood-based molded body manufactured by the method of the present invention does not require so-called patching, etc., and the deep-drawn part can be easily removed. The density of the compact can be made uniform and tight, and a compact with excellent strength can be obtained.

[Brief explanation of drawings]

FIGS. 1 to 3 are for explaining one embodiment of the method for manufacturing a wood-based molded body according to the present invention, and FIG. FIGS. 2 and 3 are schematic sectional views respectively showing the steps of setting a material aggregate formed of a wood-based molding material in a compression mold and compression molding it. Moreover, FIGS. 4 to 6 show the process of producing woody HA fiber as a raw material. FIG. 4 is a schematic perspective view showing a fibrillation machine, and FIG. 5 is also a woody HA fiber. FIG. 6 is a schematic diagram showing the dryer shown in FIG. 6A, and FIG. Furthermore, FIG. 7 is a schematic diagram showing the manufacturing process of a conventional molding mat. 30... Material aggregate manufacturing device, 31... Air blowing container, 32... Lamination container, 34... Spraying container,
35... Linear member, 35a... Swollen portion, 38...
・Partition plate, 37...Divided suction chamber, 38...Suction pipe, 45...Thermoforming mold, B! ...Material for molding, B2
...Material aggregate, M...Wood-based molded body, ■...Deep drawing part. Patent applicant: Toyota Motor Corporation (1 person)

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 in the mold. In the method of manufacturing a wood-based molded body having a deep drawn part by heat-pressing the wood-based molded body after supplying and arranging the material to , while scattering the wood-based molding material, first by suctioning the thick part of the material aggregate that will become the deep drawing part of the molded body to form a layer, and then by suctioning the entire material aggregate. A method for producing a wood-based molded article, characterized in that a low-density, irregularly shaped material aggregate is laminated and formed.