JPS62134214A - Manufacture of wooden series molded body - Google Patents

Abstract

PURPOSE:To prevent destroying of the laminated or aggregated configuration of material as well as the deviation of position upon arranging the material into a molding mold by a method wherein the aggregated body of material is held by a holder having a configuration corresponding to the configuration of the aggregated body by piercing the aggregated body by a multitude of needle type holding members formed so as to be protruded toward the inside of the holder. CONSTITUTION:When a holder 30 is positioned at the upper side of a laminating vessel 22, the inside of the holder 30 is evacuated by a suction pipe 32 and compressed air or the like is sent from the lower side of the laminating vessel 22, an aggregated body B2 is moved upward since the specific gravity thereof is small and needle type holding members 33 pierce the aggregated body B2. When the aggregated body B2 is risen further, the aggregated body is held by adhering to an upper surface configurating member 31 at the upper part of the holder 30. The holder 30 is moved by a moving means while continuing the holding and evacuation to convey the aggregated body to the upper part of a hot-press molding mold and the evacuation is released whereby the aggregated body is set on the mold.

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, 1, for example, wood chips such as chips are defibrated using a defibrator or the like to form wood fibers, and a binder such as a synthetic resin is added to the wood fibers to form a molding mat as described below. form,
This molding mat is compression molded using hot pressure molding or the like to obtain a hard wood-based molded body, and this wood-based molded body is widely used as a so-called hardboard as a material for construction and furniture. .

Conventionally, in order to manufacture the above-mentioned wood-based molded article, as shown in FIGS. 5 to 7, a molding material serving as a raw material is first manufactured. The manufacturing process for this material is to supply chips C such as wood chips to a hopper 2 of a defibrator 1 shown in FIG. . Steam S is supplied from the top of the steaming tank 4 to soften the chips C so that the fiber content can be easily separated, and the chips C are supplied from the bottom of the tank 4 to the fibrillation disk 6 by the screw feeder 5, and then the chips C are fed to the fibrillation disk 6 by the screw feeder 5, and the chips C are fed to the defibration disk 6 by the screw feeder 5. Chips C by the defibrating disk 6 driven by
is defibrated into woody ffl#1111. The thus defibrated wood fibers are supplied to the dryer IO shown in FIG. 6 by the pressure feeder 7 via the pressure feed pipe 8 and are dried. This dryer 10 uses hot air H supplied from a dryer 11 to dry the above-mentioned wet wooden edge M1 in a meandering drying pipe 12, and then supplies it to a cyclone 13, which removes moisture A. The hot air and fine powder contained therein are removed to obtain a dry wood m@'d2 of about 5 to 40+ us.Next, this wood tam'd2 is supplied from the supply port 1B of the stirrer 15 as shown in Figure @7. ,' 1 to 5% of the water resistance agent (paraffin) is applied from the plurality of spray nozzles 17, respectively.
Adhesive (thermosetting resin such as phenolic resin or thermoplastic resin) is supplied as a binder at a rate of 5 to 10%, and approximately 17% of hemp fiber for deep drawing is supplied as needed for matting. Approximately 7% of polypropylene m fibers and the like as a thermoplastic resin are added, and these are uniformly mixed and stirred by a stirring blade 18 that rotates once, and a wood-based molding material B1 is obtained from a take-out port 19.

Next, the material B1 is supplied to a forming mat material manufacturing device (not shown), and this device performs roll forming, etc.
A molding mat is produced in the form of regular channels and having a thickness of about 10-40+ m. This molding mat is in a state where the wood fibers and hemp fibers, which are the raw materials mentioned above, are pressed together. ! ! Since it is easy to transport and handle, it is stored in the form of a mat and transported in the form of a mat when necessary.

In order to produce a wood-based molded body using the above-mentioned molding mat, the shape of the finished molded body, for example, when compression molding a door trim for an automobile, must be cut to be somewhat thicker than the door trim. Supply the mat material into the compression mold,
Compression molding is performed using this mold by hot pressure molding or the like to obtain a molded object such as a door trim. At this time, if the material forming the molding mat contains a large amount of wood fiber, the molding mat is softened with steam etc. in order to obtain deep drawability, and then further shaped into a predetermined shape using a preforming mold. I tried to do the preforming to make sure that it would work.

(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. In addition to poor properties, there was a problem in that when the mat was cut into pieces somewhat thicker than the finished molded product, the cut off portion was wasted, resulting in poor product yield. Additionally, extra thermoplastic binder is required to make the material matte.

Furthermore, in order to improve deep drawability, in addition to wood m#, long fibers such as hemp or thermoplastic resin net, which are expensive raw materials, are required as mat materials, and when using hemp fibers, additional heat is required. It is necessary to add a curable resin component, and this also poses a problem of high cost.

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 increases the drawing process. As a result, corners where the mat has been 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 finished wood molded product will have a lower density. Another problem was that the strength of the protruding corners of the deep drawn portion was reduced. Incidentally, a similar problem occurs in the case of 85% wood fiber, and a material similar to that used to form the mat is brought into contact with the protruding corners of the deep-drawn part in a so-called patching manner, reinforced, and then heated. I tried to press-form it.

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 producing 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 number 1986-230).
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 300m5 despite forming a molded body
The bonding state of the wood fibers is not very strong.

However, even in such a manufacturing method using material aggregates, when placing the material aggregates formed by various methods such as lamination and suction into a mold for hot-pressing, there may be variations in the shape and density of the aggregates. There has been a problem in that the molded product may be misaligned or misaligned when placed in the mold, resulting in the formation of fragile parts, especially in the deep drawing part, of the molded product after hot-pressing processing. .

The present invention has been made in order to solve the various problems mentioned above, and it manufactures a wood-based hot-press molded product by directly feeding a material aggregate made of a wood-based material into an irregular shape to a mold. In this way, we aim to improve workability and production costs, improve the strength of the molded body, and prevent the positional shift of the material assembly for manufacturing the molded body, especially during the self-conveyance and supply process. The aim is to improve product yield by doing so.

(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. 1. A method for producing a wood-based molded article in which a low-density material aggregate is formed using a raw material, and then this material aggregate is directly supplied into a mold to be hot-press-formed. When supplied to a pressure mold, the aggregate is held by a holder having a shape corresponding to the shape of the aggregate, and the aggregate is pierced by needle-like shape retaining members formed in large numbers protruding inward of the holder. It's what I did.

(Function) Wooden molded products can be manufactured by simply going through the steps described above, so it is possible to form a molding mat using materials such as wood M&M, or cut this molding mat. In addition, there is no need to add a binder for matting, a length of hemp etc. to improve deep drawability, a thermoplastic resin net, a thermosetting resin component, etc. can be reduced. In addition, even when manufacturing a compression molded product having an uneven part (hereinafter referred to as a deep-drawn part) protruding from one or both sides of a flat surface, the corner part of the most protruding part of the deep-drawn part (hereinafter referred to as a shoulder) is produced. )
In order to prevent the mat from becoming thin or brittle, each part of the molded product can be easily molded without forming a preform or performing reinforcement work such as patching when hot-pressing the mat. It can be hot-pressed to a uniform density.

In addition, when transporting the material assembly formed in the previous process to the hot-pressing mold as described above, the material assembly, which has been laminated or aggregated in a substantially uniform and low density, is held in a cage and needle-like shape. The members are used to prevent the laminated or assembled shape of the materials from being destroyed, and also to prevent misalignment when placed in the mold, so even when deep-drawn parts are formed in the wood-based molded product, It is possible to prevent the shoulders of deep drawing from becoming weaker.

(Example) Hereinafter, an example of the method for producing an essential molded article according to the present invention will be described in detail with reference to one drawing.

1 to 3 illustrate one embodiment of the present invention, and the same reference numerals as in FIGS. 5 to 7 indicate the same or corresponding members.

Regarding the process of manufacturing the wood-based materials that serve as raw materials, see Chapter 5.
Since this method is substantially the same as the conventional method explained using FIGS. 7 to 7, only the differences will be explained.

Omit duplicate explanations.

First, a chip C such as a piece of wood is
is defibrated to produce wood fiber Wt, and this wood fiber @W
The steps up to the steps of supplying 1iW2 to the dryer 1O shown in FIG. 6 for drying and then supplying the dried wood 1iW2 to the agitator 15 shown in FIG. 7 are the same as in the conventional method. The difference is in the materials and amounts added to the dry wood fibers W2 from the plurality of spray nozzles 17 when stirring with the stirrer 15 - the water resistance agent (for example, paraffin) is approximately 1 to 5% as before.
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 1 O.
% (preferably 5%). When mixed uniformly with sufficient stirring at this ratio, a molding material made mainly of wood fibers is created, and it can be stored in this state if necessary. You can leave it there.

Next, the process of forming a material aggregate using the molding material B1 will be explained using FIG. 3. The aggregate manufacturing apparatus 20 shown in FIG. 3 includes a spraying container 24 formed of, for example, an iron plate into a roof shape, and a spraying container 24 provided at the lower side of the spraying container 24 for distributing the above-mentioned molding material B1 such as wood fiber. It is roughly constituted by a stacking container 22 to be stacked. A sprayer 23 for spraying the material 81 supplied through a pressure feed pipe (not shown) is provided at the top of the spraying container 24, and an air sprayer 23 is provided at the top of the spraying container 24. Inside the blowout volume "Jjt21, there is an air Suita outlet 21a.
, 21a are formed. Between the spraying container 24 and the stacking container 22, 1. A fitting part 29 is provided to prevent the material B1 from spilling out to the surroundings when the material B1 floats and descends. A vacuum pipe 22a for evacuating the inside is connected, and a bottom shaped member 25 such as a wire mesh or punched metal is provided above the vacuum pipe 22a to regulate the bottom shape of the assembly. A height sensor 2 is mounted on the side wall above the lower shaped member 25 of the laminated container 22 to detect the amount of laminated material B1 in order to make the aggregate a desired thickness.
8 is provided. In addition, the code|symbol 27 is the container 2 for spraying.
An air supply pipe 28 supplies air into the air supply pipe 4, and reference numeral 28 is a switching valve thereof.

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

First, open the switching valve 2 and open the air supply pipe 2.
7 to supply air into the spraying container 24 and stacking the stacking container 2.
2, and the raw material Bl, which is supplied by a pressure feed pipe (not shown) to this air flow, is sprayed from the lower surface of the sprayer 23 and dropped in a floating state toward the laminated container 22. At this time, air outlets 21a, 21a are opened on both sides of the air outlet container 21.

By switching the air blown from 21a to the left and right with the switching valve 28, or by closing both, the material B
1 will be scattered and stacked at predetermined locations. Also, from the bottom side of the stacking container 22, a vacuum pipe 2 is connected.
Vacuuming is performed by 2a, and the lower shaped member 25
Since a special air current is formed on the lower side of the stacking container 22 through the stacking container 22, as shown by the arrow in the figure, the materials are stacked along the shape of the lower shaped member 25. It turns out. In this way, the stacked materials Bl gradually take the shape of a material assembly, and the height sensor 2G provided on the side wall of the stacking container 22 detects the switching valve 2.
8, all the set sensors are vi of material Bl.
When the layer amount is detected, the old material is removed, and at the same time, the supply of air from the air supply pipe 27 is also stopped, completing the formation of the material aggregate B2.

Next, with reference to FIGS. 1 and 2, the process of conveying the material assembly B2 to the mold for thermoforming will be explained.
First, the spraying container 24 and the stacking container 22 shown in FIG.
are separated, and as shown in FIG. 2, the transport container 30 is positioned above the stacking container 22. This retainer 30 has 1. It has a shape that approximately corresponds to the shape of the t& layer container 22.

A top-shaped member 31 such as a wire mesh or punched metal is provided on the upper side so as to correspond to the shape of the upper side of the material assembly B2, and a suction pipe 32 for sucking the inside of the retainer 30 is further provided on the upper side. is connected. On the lower surface 30a of the top plate of the retainer 30, a needle 33 as a shape retaining member as shown in FIG. 2 is formed to protrude into the retaining space. In this embodiment, the needle 33 is attached to the retainer 3o.
A large number of fine protrusions 33a protrude downward from the top plate 30a of the needle and are alternately formed at arbitrary positions on the outer peripheral surface of the small diameter needle. This protrusion 33a may have a tapered surface on the lower side and a locking surface on the upper side so as to entangle the wood fibers. Therefore, as shown in FIG. When the inside of the cage 30 is suctioned by a device and compressed air is sent in from the lower side of the laminated container 22 as shown by the arrow, the aggregate B2 moves upward due to its light specific gravity, and this movement causes the material to aggregate. Since the body B2 has a low density, the needle-like shape retaining member is the material aggregate B2.
2, and when the assembly B2 rises further, it is held in close contact with the upper surface shaped member 31 at the upper part of the retainer 30.It is held in the manner as described above, and the cylinder, etc. The retainer 30 is moved by a moving means that does not move, and is conveyed to the upper part of a mold for thermoforming, which will be described later.
Setting in the mold can be performed by releasing the suction.

The material assembly B2 set in a mold (not shown) as described above is heated and pressurized at a constant temperature and pressure to complete a compression molded body.

The effect peculiar to the above embodiment is that the small diameter needle 33 is used as the needle-like shape retaining member, and the floating E of the material aggregate B2 is
Use force to pierce the button into the material assembly B2
Since the positional shift is prevented, even a simple configuration can produce a remarkable effect.

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

For example, a small diameter needle 33 is used as a needle-like shape retaining member.
Although the explanation has been made using a drill 4 having a diameter of about 0.5 to 2 mm, the present invention is not limited thereto, as shown in FIG.
0 may be provided in large numbers. Also, when the suction of the holder 30 is started, the material aggregate B2 is moved from the inside of the laminated container 22 to the holder 3.
0, the drill 40 is configured to rotate at the same time as the drill 40 rises to zero, and the continuous spiral groove 40 formed on the outer circumferential surface of the drill 40 is configured to rotate without relying solely on the suction force of the retainer 30.
a may be configured to rotate and screw into the aggregate B2 to raise the aggregate. By configuring in this way, when holding the aggregate B2, the lower tip of the needle-like shape retaining member This has the unique effect of being able to securely hold the assembly by being given a driving force to penetrate into the inside of the assembly B2.

Furthermore, in all of the above embodiments, the material aggregates were formed by a method in which the materials were piled up from the upper side, but the present invention is not limited to this, and the material aggregates are provided vertically facing each other. A material aggregate may be formed by using a container with a lower container and sucking the material floating in the lower container into the upper container (which may also be used as a holder).

(Effects of the Invention) As described above in detail, according to the method for manufacturing a wood-based molded body according to the present invention, first, a low-density material aggregate is formed using a wood-based molding material, Next, in a method for manufacturing a wood-based molded body by directly supplying this material aggregate into a mold and compression molding, the shape of the aggregate is Since the assembly is held by a holder having a shape corresponding to the shape of the holder and pierced by a number of needle-like shape retaining members formed to protrude inward of the holder, the following various effects can be achieved.

■ The material assembly, which is approximately uniformly layered or aggregated at low density, is placed in the mold using a cage and a needle-like shape retaining member so as not to destroy the stacked or aggregated shape of the materials. The body can be held securely. Furthermore, since the aggregate can be placed at a predetermined position in the mold, even if there is a deep drawing part in the wood-based molded product after hot-press molding, there will be no weak parts such as the shoulders. This makes it possible to increase the strength of the molded body and to perform molding at an appropriate position, thereby improving the product yield.

■ It is possible to omit the conventional molding mat manufacturing process, cutting process, patching process, etc.
Workability can be greatly improved throughout the entire manufacturing process of wood-based molded objects.

■ In addition, by omitting the work mentioned in ■, it is possible to prevent the waste of materials such as cut-off parts of the mat that occur during cutting and patch materials, and save the raw material wood fiber. It is also possible to improve the product yield.

■ In relation to the above-mentioned item (■), even when manufacturing a molded body having a so-called deep drawn part, it is possible to immediately apply it to the hot-press forming process by simply making the deep drawn part of the aggregate thick-walled in advance. Unlike molding mats, there is no need for softening with steam or pre-forming, and there is no need for thermoplastic resin for matting. Since resin nets and the like are also not required, the manufacturing process can be simplified and costs can be reduced in this respect as well.

■ Also, unlike the conventional method of using a forming mat and a preform, it is possible to make the density of the formed object uniform and tight in the probe drawing part without the need for so-called batch application, which improves strength. An excellent molded article can be obtained.

[Brief explanation of drawings]

1 to 3 are for explaining one embodiment of the present invention, in which FIG. 1 is a schematic cross-sectional view showing the process of conveying the material assembly into the hot-pressing mold by the holder, and FIG. Similarly, FIG. 3 is an enlarged perspective view showing the needle-like shape retaining member provided in the cage, and a schematic cross-sectional view showing the dead layer process of the aggregate. FIG. 4 is an enlarged perspective view showing a needle-like shape retaining member according to another embodiment of the present invention. Furthermore, FIGS. 5 to 7 explain the process of manufacturing wood fibers, and FIG. 5 is a schematic perspective view showing a fibrillator, FIG. 6 is a schematic configuration diagram showing a dryer, and FIG. FIG. 2 is a partially cutaway perspective view showing the stirrer. 20... Material aggregate manufacturing device, 22... Container for lamination, 30... Holder, 30a... Top plate, 33... Needle (acicular shape retaining member), 33a... protrusion, 4
0... Drill (needle-like shape retaining member), 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 aggregate is supplied and hot-press molded, when the material aggregate is formed and fed to the hot-press mold, it is held by a holder having a shape corresponding to the shape of the aggregate, and A method for manufacturing a wood-based molded body, characterized in that the aggregate is pierced by a plurality of needle-like shape-retaining members formed to protrude inward of the holder.