JPH02192907A - Molding device for ligneous board - Google Patents

Abstract

PURPOSE:To improve productivity by enabling molding whose yield is favorable and making use of a shortening effect of a hot pressing time especially with a steam injection press device, by performing continuously and in a short period of time press molding of a particle board or a fiber board. CONSTITUTION:A net conveyor 2 conveying a molded ligneous board prior to a press process is provided. A steam injection press device 7 heat-pressing a mat 6 conveyed by the net conveyor 2 is provided. The steam injection device 7 is constituted so that the same is movable along a conveying direction of the net conveyor 2 with a wheel 8 supported at the lower part. Press molding is performed by injecting high-pressure steam through a press plate surface while moving the steam injection press device 7 at the same speed as the belt conveyor 2 along a conveying direction from a predetermined initial position. Then the steam injection press device is moved along an anticonveying direction up to the predetermined initial position from a press molding completing position. With this construction, it is constituted so that steam injection press molding is performed in succession to a part where press molding is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wood board forming apparatus, and more particularly to a forming apparatus capable of continuously press-forming wood boards such as particle board and fiberboard.

[Conventional technology]

Wooden boards such as particle board and fiberboard are made of small pieces of wood (particles) and fibers (fibers).
After adding a binder (adhesive) such as a phenol resin to the mat and forming it into a mat, the mat is hot-pressed to harden the binder and recombined to form a plate.

By the way, the hot-pressing plate forming process affects product quality and yield, and also determines productivity111! This is an important process, and improvements have been made to hot press equipment.

A hot press machine is widely known as a hot press machine used in the hot pressing process, but in recent years, high temperature and high pressure steam is injected into particle mats and fiber mats from upper and lower platens. Steam injection press equipment is attracting attention.

In the case of hot mold presses, the supply of thermal energy necessary to cure the binder relies on heat conduction from the hot mold, whereas in steam injection presses, the injected water vapor flows into the mat. It diffuses and carries thermal energy. In the case of steam injection press equipment, the steam injected from the platen instantly reaches the center layer of the mat, and the entire mat is heated to the curing temperature of the binder, so steam injection press equipment requires less heat than hot press equipment. This method has the advantage that it can be expected to significantly shorten the pressing time and improve productivity.

[Problem to be solved by the invention]

In this way, if a steam injection press machine is used in the heat-pressing process of wood boards, productivity can be expected to be improved compared to using a heat-forming machine, but it is difficult to press unformed mats of a predetermined size. In the conventional forming process, in which sheets are hot-pressed by being intermittently supplied to a press machine, the size of the wood board that can be formed is limited by the size of the hot form in the press machine, and the end faces must be cut after forming the board. Since they must be aligned and shaped, the yield is poor, and even if a steam injection press device were used, for example, the effect would be limited to simply shortening the hot pressing time. For this reason, it has been desired to provide an apparatus that can press-form wood boards more efficiently.

[Purpose of the invention]

The present invention has been made in response to the above-mentioned demands, and it enables the continuous forming of wood boards with a high yield by performing the press forming process of wood boards continuously and in a short time. An object of the present invention is to provide a wood board forming device that can effectively utilize the shortening effect of hot pressing time by an injection press device.

[! ! ! Means to solve the problem]

In order to achieve the above object, the wood board forming apparatus according to the present invention includes a belt conveyor that conveys the formed wood board before the pressing process, and a steam injection press that forms the wood board conveyed by the belt conveyor with a steam injection press. and a movement actuator that moves the steam injection press apparatus along the transport direction and counter-transportation direction of the wooden board by the belt conveyor, and the movement actuator moves the steam injection press apparatus to a predetermined position. While moving from the initial position along the conveying direction at the same speed as the belt conveyor, high-pressure air is injected from the press plate surface to perform press forming, and the steam injection press is moved to the press forming end position. By moving the sheet from the sheet to the predetermined initial position along the counter-conveying direction, steam injection press forming is performed continuously on the previously press formed part.

With this configuration, the steam injection press device moves at the same speed as the belt conveyor conveys the formed wood board before the pressing process, and the steam injection press sheet forming is completed. Since the steam injection press device is returned to the predetermined initial position and press forming is performed continuously on the previously pressed portion, press forming can be performed while the belt conveyor is continuously operated.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a diagram showing the overall configuration of a wood board forming apparatus 1 according to the present invention, and this wood board forming apparatus 1 forms wood boards such as particle board and fiberboard under heat.

Here, a net conveyor 2 is provided which conveys the formed wooden board before the pressing process from the left end to the right end in the figure. In the net conveyor 2, a net-like belt 3 through which steam passes is sequentially fed by a driving motor 4, and small pieces of wood (particles) or fibers are coated with a binder (adhesive) such as phenol resin. A forming station is installed at the top of the left side to form the added material into a mat shape.
The pine nuts continuously formed at this forming station are sequentially conveyed horizontally and laterally by the net conveyor 2.

Further, a steam injection press device 7 is provided which heats and presses the MAFTORO conveyed by the belt conveyor 2. This steam injection press device 7 can be moved along the transport direction of the net conveyor 2 by wheels 8 supported at the bottom, and a press travel cylinder 9 as a moving actuator with one end fixed. The other end is supported, and by the expansion and contraction of the press travel cylinder 9, the net conveyor 2 is driven to move in the transport direction and in the counter-transport direction of the MAFTORO.

The steam injection press device 7 includes a press cylinder 10
Accordingly, the lower steam injection platen 11 moves in the vertical direction in the figure, and is configured to come into contact with and leave the lower steam injection platen 12 in a parallel state. Further, as shown in FIG. 2, a plurality of injection nozzles 13 for injecting steam into the maturo are opened on the press surfaces (press plate surfaces) of the lower steam injection pressure platen 11 and the lower steam injection pressure platen 12. Steam is supplied to these injection nozzles 13 via supply pipes 14 buried in the pressure platen 12.13 for each nozzle row, and the supply pipes 14 are provided with an injection amount adjusting valve 15 (not shown). Steam is sent from a steam generator.

Moreover, cooling plates 16.
7, and a cooling water supply pipe 18 for circulating cooling water is embedded in this cooling plate 16,17. When the thermal energy from the upper steam injection platen 11 and the lower steam injection platen 12 is transferred to the maturo that will be hot-pressed next time, the binder will harden before hot-pressing.
The cooling plates 16 and 17 are designed to prevent thermal energy from being transferred from the hot press. In addition to the heat cutoff by the cooling Fi 16° 17, the baths on the Matsutro insertion side of the injection nozzles 13 provided on the upper steam injection pressure plate 11 and the lower steam injection pressure plate 12 are divided into smaller parts, and the injected steam is transferred to the cooling plate 16.17 side. This prevents the thermal energy from flowing to the matsuro before the hot pressure press, and, together with the cooling plates 16 and 17, double prevents the thermal energy from being transmitted to the maturo before the hot press.

Incidentally, among the cooling plates 16 and 17, the lower steam injection pressure plate 11
The crimping surface of the cooling plate 16 attached to the lower steam injection platen 11 is formed in an arc shape that is further away from Matsutoro as it moves away from the lower steam injection platen 11. This is to prevent large differences in level between the two.

Next, the process of pressing a wooden board using the wooden board forming apparatus 1 will be explained.

First, in this embodiment, 77
The conveyance speed of the top 6 was set to 5 am/S, and the upper steam injection pressure plate 11
and lower steam bite pressure! The dimensions of the platen 112 are 112 mm wide x 1000 mm long, the speed in the conveying direction (forward) of the steam injection press W7 by the press running cylinder 9 is 5 m/s, and the speed in the opposite direction (backwards) is 1501 m/s. It is.

Further, the time required for the hot press process by the steam injection press device 7, that is, the time required from the lowering of the lower steam injection platen 11 to the hot press time including steam injection - the raising of the upper steam injection platen 11 is assumed to be 180 seconds.

Under these conditions, the net conveyor 2 is constantly operated at the above-mentioned conveyance speed, and the steam injection press device 7 is moved from a predetermined initial position on the left side in FIG. The movement is started at the same speed of 5 fins/s, and at the same time as the start of this movement, the lowering (pressurization) of the upper steam injection platen 11 for the heat pressure process is started (see FIG. 3).

Since the hot pressure process using the steam injection press device 7 requires 180 seconds as described above, the steam injection press device 'J17
runs parallel to net conveyor 2, 5mm/5X180
The thermopressure step including steam injection is completed at a position advanced from the initial position by 900 ml per second. If the steam injection press device 7 is returned to the initial position by the press traveling cylinder 9 immediately from the position where this hot pressure process is completed, the retraction speed is 150++ m/S, so the speed is 900 mm/150 m/s.
■It will return to the initial position in m/S = 6 seconds. Since the net conveyor 2 continues to convey even when the steam injection press device 7 is returned to the initial position, the Matsutoro is conveyed for 6 seconds x 5 ■■ / S = 30 ms during the 6 seconds it returns to the initial position. As a result, 900n++3011=93On (186
Matsutoro will be transported for a period of time (seconds x 5 m/5 = 930 dragons).

However, the platens 11 and 12 of the steam injection press device 7
Since the length in the conveyance direction is 1000n and the length in the conveyance direction is 1000i in one press operation, the maturo is hot-pressed, so when the steam injection press W7 returns to the initial position, the platen 11. 1 for Maftoro sandwiched by 12
000 Tsuru - τ Tomari mm = 70 mm of the heat-pressure flow remains untransferred, and by immediately repeating the heat-pressure process as described above after returning to the initial position, only Maftoro's 70 Dragon is transferred twice. It is possible to continuously form Matsutoro into sheets even though it is heated and pressed over several years.

If continuous board forming can be performed in this way, it will be possible to make continuous wood boards in a short time while fully utilizing the effect of greatly shortening the heat pressing time using the steam injection press equipment M7, and it will be possible to form wood boards continuously in a short time. This can significantly improve efficiency (production efficiency).

Condition C to enable continuous thermoforming as described above: It is a necessary condition that the net conveyor 2 and the steam injection press device 7 move at the same speed in the conveying direction. The steam injection press device 7 is not limited to this, and the steam injection The length of the platens 11 and 12 of the press machine M7 in the conveying direction (1000n in this example)
) is long, continuous thermoforming as described above is possible.

In addition, in the wood board forming apparatus l configured as described above, it is possible to use a Pt% plate press apparatus instead of the steam injection press apparatus 7, but the heat-pressing time is significantly longer than that of the steam injection press apparatus 7. Therefore, particularly efficient hot-pressing can be achieved by using the steam injection press device 7 whose hot-pressing time is a short time of 2 to 3 minutes.

〔Effect of the invention〕

As explained above, according to the wood board forming apparatus according to the present invention, press forming of wood boards such as particle board and fiberboard can be performed continuously and in a short time, so that continuous wood board forming with high yield can be performed. In particular, it is possible to improve the productivity of wood boards by effectively utilizing the effect of shortening the heat pressing time by the steam injection press device.

[Brief explanation of the drawing]

Fig. 1 is a front view of a wood board forming apparatus showing one embodiment of the present invention, Fig. 2 is a partially enlarged perspective view showing a platen of a steam injection press machine in the same embodiment, and Fig. 3 is a front view of a wood board forming apparatus showing an embodiment of the present invention. It is a time chart showing Mf'211 timing. I... Wood board forming device 2... Net conveyor 6... Mud door... Steam injection press device 8... Wheels 9... Press travel cylinder 10... Press cylinder 11... Upper part Steam injection pressure plate 12...lower steam injection pressure plate

Claims (1)

[Claims] A belt conveyor that conveys the formed wooden board before the pressing process, a steam injection press device that forms the wooden board conveyed by the belt conveyor with a steam injection press,
a moving actuator that moves the steam injection press device along the conveyance direction and the counter-conveyance direction of the wooden board by the belt conveyor, and the movement actuator moves the steam injection press device to a predetermined initial position. While moving along the conveying direction at the same speed as the belt conveyor, high-pressure steam is injected from the press plate surface to perform press forming, and the steam injection press device is moved from the press forming end position to the predetermined position. A wood board forming apparatus characterized in that the wood board forming apparatus is configured to perform steam injection press forming continuously on a previously press formed part by moving the wood board to an initial position along the counter-transfer direction.