JPH08169027A - Method and equipment for manufacturing molded article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the blocking of the opening of a supply passage by introducing high temp. gas or steam into the mixture positioned within a press mold in the mainly oblique direction with respect to a press direction. SOLUTION: In a press, the cavity 3 provided to the lower part 1 of a press tool is filled with a mixture and a press ram 2 is sunk in the direction shown by an arrow 4 to compress the mixture positioned within the cavity 3. Conduits 6 are provided to the lower part of the press tool and the press ram 2 and, for example, high temp. steam is supplied through the conduits 6. Gathering pipes 7 are provided to the lower part of the press tool and the respective supply passages 8 for high temp. gas or steam opened to the cavity 3 extend from the gathering conduits 7 in an obliquely downward direction. These supply passages 8 are inclined by 45 deg. with respect to the press direction.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a method for producing a shaped body from a non-flowable mixture of chips and / or fibrous materials and a thermosetting binder, which mixture comprises:
The present invention relates to a method of finish-pressing and hardening with a press having a press mold closed on the entire surface, and applying at least a part of heat energy necessary for hardening by a hot gas or steam introduced into a mixture during pressing. .

[0002]

2. Description of the Related Art Such a method is disclosed in European Patent Application Publication No. 4
It is known from the specification of 43053. This known method relates to the production of moldings from non-flowable mixtures, such as pressing the moldings from the mixture under the action of pressure and heat in a hot pressing process. In such known methods, hot gas or steam is introduced into the mixture located in the press mold in a direction substantially perpendicular to the pressing direction. Such means result in a rapid and uniform introduction of the gas or vapor into the closed press mold, so that the pressing and setting times are reduced to a minimum.

Although this known method works very satisfactorily, however, a portion of the mixture is caught in the openings of the feed channels through which the gas or vapor is guided into the mixture. It is actually known that there is a risk of blockage. This hinders the rapid and uniform introduction of gas or vapor. Such disadvantages occur especially when the tip or fiber portion of the mixture is the size of, or smaller than, the openings in the feed channel.

[0004]

The object of the present invention is to improve the method mentioned at the beginning to eliminate the above technical problems,
It is an object of the present invention to provide a method for preventing the opening of the supply path from being blocked.

[0005]

In order to solve this problem, in the method of the present invention, a high temperature gas or steam is introduced into a mixture located in a press die mainly in a direction oblique to the pressing direction. I did it.

[0006]

Practical use of the technical means according to the invention does not impair the rapid and uniform introduction of the gas or vapor into the mixture located in the press mould, while significantly reducing the tendency of the supply channels to become blocked. To be This is obviously due to the fact that the force component acting on the particles of the mixture is smaller than in the known method, so that fewer particles are caught in the feed channel openings. Furthermore, the particles, which may still be caught, are re-applied by the pressing part which slides by the opening.

Advantageous methods of the invention and devices for carrying out the method of the invention are described in claims 2 to 9.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described with reference to the embodiments shown in the drawings.

The press shown in FIG. 1 comprises a lower part 1 of the press tool and a press ram 2. This press
The position is shown after the cavity 3 of the lower part 1 of the press tool is filled with the mixture and the press ram 2 is submerged in the direction of the arrow 4 to compress the mixture located in the cavity 3. After the mixture has been compressed, ie when the shaped body is finish pressed, the shaped body still has the height indicated by the dashed line 5. The press shown in FIG. 1 is provided for pressing a block-shaped or board-shaped molded body.

The non-flowable mixture contains lignocellulose, such as crushed and dried wood chips, bacas fiber, etc., mixed with a heat-curable artificial resin such as melamine urea formaldehyde resin or phenol formaldehyde resin. Advantageously, it is made of a fibrous material. If it is desired to give the finished pressed body some elasticity, the binder may comprise a component of thermoplastics. Instead of crushed and dried wood or bagasse fibers, fibers of other materials such as glass fibers or rock wool fibers may be used alone or by mixing a plurality with one another. These materials are admixed with suitable, preferably organic, binders.

As further seen in FIG. 1, the lower part 1 of the press tool and the press ram 2 are provided with a conduit 6. Hot steam, for example, is supplied through these conduits. The steam heats the press. further,
It can be seen that the lower part 1 of the press tool is provided with a collecting conduit 7. Starting from such a collecting conduit, each supply channel 8 for the hot gas or vapor, which opens into the cavity 3, extends. The supply path 8 provided above the broken line 5 extends obliquely downward. That is, these supply channels are inclined at an angle of 45 ° with respect to the pressing direction indicated by arrow 4. Only the supply channel 9 located below the broken line 5 extends in the horizontal direction.

FIG. 2 shows the structure of a press such as is used for the plus working of annular shaped bodies. This press is shown in a position where the cavity 10 is filled with the mixture, i.e. before pressing the shaped body. This press includes, for example, an annular press ram 11, a press tool upper portion 12 and a cover 13 thereof.
And consists of. The cover 13 can be opened to fill the cavity 10 with the mixture. When a force is applied at a right angle to the cover 13, the press tool upper part 1
2 moves downward, and the press ram 11 is pushed into the cavity 10. This compresses the mixture located in this cavity. This pressing direction is indicated by the arrow 14. Further, as can be seen from FIG. 2, in such a press, the press ram 11,
The conduit 6 is again provided in the upper part 12 of the press tool and in the cover 13. These conduits have the same function as in the press shown in FIG. Furthermore, the upper part 12 of the press tool is provided with a collecting conduit 7 and a supply channel 8. These supply channels 8 are also arranged at an angle of about 45 ° with respect to the pressing direction (arrow 14).

The device shown in FIG. 3 is a variation of the press of FIG. The molded product manufactured by such a press is a pallet. Such pallets are known, for example, from EP 179927. These pallets mainly consist of a horizontal platform with hollow legs having a conical or pyramidal shape. The press shown in FIG. 3 comprises a stationary press tool lower part 15 and a vertically movable press tool upper part 16. This press is shown in FIG. 3 in a position after the upper part 16 of the pressing tool has already been inserted into the lower part of the pressing tool, that is to say after pressing the shaped body. As shown in FIG. 3, the lower part 15 of the press tool is provided with as many recesses 17 as there are pallet legs. The upper part of the press tool has a corresponding number of ridges 18.
Furthermore, the lower part 15 of the press tool has a collecting conduit 7 and a supply channel 8 in the same way as shown in FIG.
The upper part 16 of the press tool is provided with a collecting conduit 19 which extends into the ridge 18. From this collecting conduit, the supply channels 20 and 21 project into the hollow chamber 22 of the lower part 15 of the press tool. In the case of this embodiment, the supply path 2
0 is directed obliquely upward, and the supply passage 21 is directed obliquely downward.

[Brief description of drawings]

FIG. 1 is an example of a press having the features of the present invention.

FIG. 2 is another embodiment of a press having the features of the present invention.

FIG. 3 is a modified example of the press of FIG.

[Explanation of symbols]

1 lower part of press tool, 2 press ram, 3 cavity, 4 arrow, 5 broken line, 6 conduit, 7
Collecting conduit, 8,9 supply path, 10 cavities,
11 press ram, 12 press tool upper part,
13 cover, 14 arrow, 15 press tool lower part, 16 press tool upper part, 17 recess, 18
Ridge, 19 collecting conduits, 20, 21 supply path,
22 cavities

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location B29K 105: 12

Claims (9)

[Claims] 1. A method for producing a shaped body from a non-fluidic mixture of chips and / or fibrous materials and a thermosetting binder, the mixture being pressed with a press die which is completely closed. In the method in which the hot gas or steam introduced into the mixture during pressing is applied to at least a part of the heat energy required for hardening, the hot gas or steam is pressed into the press mold. A method for producing a shaped body, which is characterized in that the mixture is introduced into the mixture located in a direction mainly oblique to the pressing direction. 2. The method according to claim 1, wherein the direction of introducing the hot gas or steam into the mixture located in the press mold is inclined by an angle of about 45 ° with respect to the pressing direction. 3. An apparatus for carrying out the method according to claim 1 or 2, wherein: (a) a stationary pot-shaped lower part (1) of the press tool having a cavity (3) is provided; A vertically movable press ram (2) adapted to the cavity (3) is provided, and (c) a plurality of feeds are provided on the wall of the lower part (1) of the press tool, which is positioned parallel to the press direction. A shaped body, characterized in that a channel (8) is arranged, said supply channel opening into at least one collecting conduit (7) connected to a reservoir for hot gas or vapor. Equipment to manufacture. 4. The feed channel (8) provided in the inner wall of the lower part of the press tool in the region where the press ram (2) moves beside it is inclined at an angle of about 45 ° with respect to the pressing direction (4). The apparatus of claim 3, wherein the apparatus is arranged in parallel. 5. The supply channel (9) provided near the bottom of the lower part (1) of the pressing tool is arranged at right angles to the pressing direction (4). apparatus. 6. A device for carrying out the method according to claim 1 or 2, characterized in that: (a) a vertically movable press tool upper part (12) with a cavity (10) is provided; ) A stationary press ram (11) fitted to the cavity (10) is provided, and (c) the press direction (1) of the upper part (12) of the press tool.
4) a plurality of supply channels (8) on the wall parallel to
An apparatus for producing a shaped body, characterized in that the supply path is open to at least one collecting conduit (7) connected to a reservoir for hot gas or vapor. 7. The feed channel (8) is inclined in the region of the inner wall of the upper part (12) of the press tool in which the press ram (11) moves beside by an angle of about 45 ° with respect to the pressing direction (14). 7. The device of claim 6, wherein the devices are arranged in parallel. 8. At the bottom of the lower part (15) of the press tool,
A plurality of recesses (17) are arranged, the lower surface of the upper part (16) of the press tool is provided with a corresponding number of recesses (17) of ridges (18) which fit into the recesses, and , At least one collecting conduit (19) being arranged in each ridge (18), said collecting conduit being open to a supply channel (20, 21) extending towards the edge of the ridge The device according to claim 3. 9. A supply channel (20) provided in an upper region of the ridge (18) is directed obliquely upward, and the ridge (1) is provided.
9. The device according to claim 8, wherein the supply channel (21) provided at the tip of 8) points obliquely downward.