JPS622678B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a drying device for drying veneer veneers, etc., and in particular to a drying device for drying veneer veneers, etc., in which the veneer to be dried is held under pressure between a fixed heating plate and a movable heating plate. Regarding drying equipment.

In general, veneer veneer immediately after being cut with veneer lace contains water with a moisture content of 60 to 100%, so it cannot be used as is, so it must be dried to reduce the moisture content.
It is necessary to dry it to about 10%. For this reason, a so-called hot air circulation drying method has been used in which the veneer veneer is fed into a hot air drying oven, but this method has low thermal efficiency and the veneer veneer becomes distorted during drying, resulting in poor quality. It was difficult to obtain the product.

In order to solve this problem, the applicant must first:
Provided a method of heating and drying a veneer veneer by sandwiching it between a fixed heating plate and a movable heating plate via an endless stainless steel belt (Japanese Patent Application Laid-Open No. 1983-1999).
(See Publication No. 126555).

However, this type of heating plate has a stainless steel endless belt between the heating surface of the fixed heating plate and the movable heating plate and the veneer veneer to be dried, so heat transfer to the veneer veneer is poor, and the use period is long. One drawback was that the endless belt was damaged by the heat.

Furthermore, without using such an endless belt, for example, a rod-shaped bushier may be brought into contact with the rear edge of a veneer veneer placed on a fixed heating plate, and the veneer veneer may be propelled by this bushier. However, in this case, the problem is that when the movable heating plate is separated after the veneer veneer is hot-pressed, the veneer veneer shrinks, the overall length becomes shorter, and the yield of the veneer veneer after drying decreases. It was hot. Furthermore, the height of the pusher needs to be lower than the thickness of the veneer veneer during hot pressing, and therefore, even if the veneer veneer has a slight warp, the propulsion will not be ensured. There was a risk that the position of the veneer veneer in the advancing direction would shift or that the veneer veneer would overlap.

Furthermore, in this type of drying equipment, the release of moisture from the veneer veneer occurs mainly when the movable heating plate is separated, but the release of moisture is suppressed because the surface of the veneer veneer becomes dense due to heat pressure. There was also the problem of being exposed.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a drying apparatus equipped with a fixed heating platen, a movable heating platen that can approach and move away from the fixed heating platen, and a transport mechanism for transporting a veneer to be dried between these heating platens. , the veneer to be dried is directly hot-pressed by both heating plates, the veneer veneer placed on the heating plate is transported reliably, and the drying efficiency and yield of the veneer veneer after drying are improved. The goal is to provide equipment.

An embodiment of the drying apparatus of the present invention will be described below with reference to the drawings.

FIG. 1 is a side view schematically showing an embodiment of the present invention, and FIG. 2 is a plan view taken along line AA in FIG. 1.

In FIGS. 1 and 2, reference numerals 1 and 1 indicate fixed heating plates, and on the heating surfaces of these fixed heating plates 1 and 1, there are approximately 4 consecutive concave grooves 2 at equal intervals,
2,...2 are engraved. These fixed heating plates 1, 1 are arranged in series on the same horizontal plane, and in this state, the grooves 2 are shifted in the width direction so as not to coincide with the veneer transport direction through both heating plates 1, 1. are formed on the fixed heating plates 1,1.

In each of these grooves 2, 2, . . . 2, endless chains 3, 3, . The mechanism 5 rotates them at the same circumferential speed.

As shown in FIG. 3, the endless chains 3, 3,...3 have a link 3a formed with an overhang 3b, and an attachment 3d having a protrusion 3c implanted on the upper surface of the overhang 3b, which is inserted into the bolt hole 3e. A veneer veneer plate is pierced on the outer periphery by inserting a bolt into the hole and tightening and fixing it, or by forming a pierced body 3c directly on the link 3a that constitutes the endless chain 3 as shown in FIG. 4 or 5. A piercing body is formed.

The width of the link 3a is equal to or slightly smaller than the depth of the grooves 2, 2, ... 2 formed in the fixed heating plates 1, 1, and ,2,...2 has an endless chain 3,3,...
3, etc., so that only the piercing bodies 3c protrude onto the heating surfaces of the fixed heating plates 1, 1. In addition, the endless chains 3, 3, ... 3, as shown in FIGS. 6 and 7 (FIG. 7 is a bottom view of FIG. 6), have a large number of nails attached to a heat-resistant belt 6 such as a stainless steel belt, a metal mesh belt, etc. It is also possible to replace the endless belt with the thread 6a embedded therein or the comb-shaped cutter 7 similar to a chain saw as shown in FIG. 8 by using an attachment 7a attached to the endless chain or belt.

Further, in the illustrated example, two fixed heating plates 1, 1 are arranged in series, but the number may be increased or decreased as necessary, or they may be arranged in parallel. When arranging them in parallel, an endless chain or an endless belt may be provided in the gap between each heating plate.

On the other hand, in FIG. 1, above the fixed heating plates 1, 1, movable heating plates 8, 8 each having a heating surface of the same size move up and down in the direction of arrow C along a guide column (not shown). It is set up so that you can do it.

The movable hot platens 8, 8 can be raised and lowered by driving devices 9, 9, . . . 9, such as a hydraulic device, for example. These driving devices 9, 9...9 are arranged at each of the four corners above the movable heating plates 8, 8, and each driving device 9 is driven synchronously. Note that a configuration may be adopted in which the upper part is a fixed heating plate and the lower part is a movable heating plate. The above fixed heating plates 1, 1 and movable heating plates 8, 8
is heated to a predetermined temperature by a heat source such as heated steam, thermo oil, or electric heat. A veneer veneer carrying-in table 10 is arranged at the front end of the fixed heating platen on the veneer veneer entrance side, and a carrying-out table 11, which also serves as a veneer peeler, is arranged at the rear end of the fixed heating platen 1 on the veneer veneer outlet side. is located. 12, 12,…
Reference numeral 12 denotes height-adjustable stoppers for regulating the thickness of the veneer veneer, which are protruded from the four corners of the movable heating plates 1, 1, so that the veneer veneer is not pressed more than necessary.

Next, the operation of the device of the present invention will be explained.

As shown in FIG. 1, the plywood veneer V sent from the carrying table 10 onto the endless chain 3
Fixed hot platen 1 by endless chain 3 driven in the direction
The rear edge of the veneer veneer V is fixed on the heating plate 1.
The endless chain 3 is temporarily stopped at the upper position. This stopping may be done manually, or may be done automatically using a sensor such as a photoelectric element or a limit switch.

Next, the movable heating platen 8 descends to pierce the veneer veneer V into the piercing bodies of the endless chain 3, and at the same time pressurize and heat it. After heating for a certain period of time, the movable heating plates 8, 8 are raised, the endless chain 3 is driven, and the same operation is repeated thereafter. During this time, water evaporates from the heat-pressed veneer veneer V, but the veneer veneer V is pierced by a large number of piercers, and minute cracks are generated around the puncture marks. Drying efficiency is significantly improved because moisture evaporates directly from inside the board. In addition, the veneer veneer is pierced by a large number of pierced bodies 3c and many cracks are formed, and the shrinkage force is reduced by the cracks, so that a reduction in yield due to shrinkage of the veneer veneer V is prevented.
As shown by the imaginary line in Fig. 1, an anvil roll R covered with an elastic material such as rubber is arranged on the sprocket 4 on the entrance side of the veneer veneer, and the pierced body is sequentially inserted from the tip of the veneer veneer V. If 3c is pierced, cracks will be formed in the veneer V in order,
This also stretches the veneer veneer, further enhancing the above effect.

In addition, in this embodiment, heat transfer from the fixed heating plates 1, 1 is reduced in the portion of the veneer veneer V that corresponds to the concave groove of the fixed heating plates 1, 1; The positions of the concave grooves 2, 2,...2,
Concave grooves 2, 2,... of fixed heating plate 1 on the outlet side of the veneer veneer
Since the positions No. 2 and 2 are offset in the width direction of the heating plate, heating can be performed over the entire surface of the veneer veneer, and uneven drying will not occur.

The above is an example in which the endless band is arranged only on the fixed heating platen side, but in the present invention, it can also be arranged on the movable heating platen 8 side as described below.

FIG. 9 shows a side view of such an embodiment, and FIG. 10 shows an end view taken along line BB in FIG. 9. Note that in FIGS. 9 and 10, parts common to FIGS. 1 and 2 are designated by the same reference numerals.

In the embodiment shown in FIGS. 9 and 10, concave grooves 2, 2, .
2 are formed in a straight line along the plywood veneer transport direction or at positions shifted in the width direction, and within these grooves 2, 2, ... 2, a series of endless belts are commonly installed in the fixed heating plates 1, 1. 3, 3,...3 are arranged. Note that the endless belt 3 may be provided for each fixed heating platen 1, 1. On the other hand, the fixed heating plate 1,
Similar grooves 2', 2', . . . 2' are formed at positions shifted in the width direction from the grooves 2, 2, . . . 2 of 1.
Also in these concave grooves 2', 2', ...2', there is a series of endless (or separate movable heating plates 8, 8) in which a large number of protrusions 3C' are implanted in both movable heating plates 8, 8. Belts 3', 3', . . . 3' are provided.

These endless belts 3', 3', .
The sprocket 4' on the plywood unloading side moves horizontally as shown by the imaginary line to absorb the slack of the endless belt 3'. 13,13
is a guide roll for preventing the endless belt 3' from sagging, which is elastically supported by springs 14, 14. In this embodiment, shallow grooves 15 and 15' are formed on the heating plate surfaces of fixed heating plates 1, 1 and movable heating plates 8, 8 facing endless belts 3 and 3'. Rubber-like elastic bodies 16 and 16' are filled inside 15', respectively.

In the embodiment described above, the veneer veneer is pierced by the pierced bodies 3c, 3c' of the upper and lower endless belts 3, 3', so that the cutting quality according to the present invention is further improved.
Also, a rubber-like elastic body 1 is provided on the opposing surface of the piercing bodies 3c and 3c'.
6 and 16' are arranged, so even if the piercing bodies 3c and 3c' penetrate deeply into the plywood veneer, there is no risk of damage to the tips of the piercing bodies 3c and 3c' or the heating plate surface. Does not occur.

In addition, in this embodiment, the movable heating plates 8, 8
When rising, there is a risk that part or all of the veneer veneer may be lifted up by the upper endless belt 3'. To prevent this, for example, as shown in FIGS. 11 and 12 (FIG. 12 is a partial sectional view taken along the line CC in FIG. 11), endless belts 3', 3',...3'
A groove 17 may be formed in the movable heating plate 8 along the movable heating plate 8, and a take-off bar 18 may be protruded from the position of the groove 17 so that it can be moved up and down so as to be accommodated in the groove 17. 19, 19 is a take-off bar 18 at one end
while fixing the other end to the top surface of the spring 2.
Pass through the movable heating plate 8 through the nut 2
1 and 21 are support bolts that are secured to the movable heating plate 8.

According to this embodiment, when the movable heating plate 8 is lowered, the take-off bar 18 comes into contact with the veneer veneer V and moves into the groove 17 against the elastic force of the spring 20, as shown in FIG. 12B. Stored endless belt 3,
3,...3, but at the initial stage of the rise of the movable hot platen 8 after hot pressing, the take-off bar 18 suppresses the veneer veneer V due to the elastic force of the spring 20, as shown in Figure A. Continuing, on the other hand, the upper belts 3', 3', . After this, the movable heating platen 8 further rises, and the take-off bar 18 also separates from the veneer veneer V, as shown in FIG. 11, and in this state, the lower endless belts 3, 3,... The veneer veneer V is driven and moved to the next hot press position. Note that the take-off bar is not limited to a spring, and a cylinder or other lifting device may be used to raise and lower the take-off bar.

FIG. 13 shows an example of application of the apparatus according to the embodiment of the present invention shown in FIG.
and the entire housing 24 except for the outlet 23
covered with. This housing 24 is provided with a ventilation port 25 for releasing water vapor.

In this application, the entire device is covered by the housing 24, which prevents heat dissipation and further improves the thermal efficiency of drying. In addition, the 9th
Of course, it is also possible to cover the device of the embodiment shown in the figures with a similar housing.

As explained in detail above, according to the present invention,
The veneer placed on the fixed heating plate is dried and transported while being pierced by a large number of piercers, which accelerates drying and suppresses shrinkage, improving drying efficiency and yield. At the same time, the conveyance of the veneer veneer can also be carried out in an orderly and reliable manner. In addition, in the above example, an example was explained in which the apparatus of the present invention was used to dry a veneer veneer.
The present invention should not be limited to such embodiments, but can be directly applied to the drying of fiberboard and other similar products.

As explained above, in the present invention, continuous grooves are formed in the heating surface of at least one of the fixed heating platen and the movable heating platen along the conveying direction of the veneer, and in this groove, the An endless belt is provided that has protrusions protruding from the heating surface of the heating platen and is driven in the veneer transport direction by a drive mechanism, so that the veneer to be dried can be directly hot-pressed by both heating platens, and the veneer can be heated directly onto the heating platen. It is possible to reliably convey the veneer veneer placed on the veneer, and to improve the drying efficiency and the yield of the veneer veneer after drying.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram schematically showing an embodiment of the present invention, Fig. 2 is a plan view taken along line A-A in Fig. 1, and Fig. 3 shows the main parts of the endless chain used in the present invention. FIG. 4 is a perspective view showing the essential parts of another example of the endless chain, FIG. 5 is a partial side view showing still another example of the endless chain, and FIG. 6 is an alternative to the endless chain. A side view showing an example of an endless belt used in
Fig. 7 is a bottom view of the same, Fig. 8 is a perspective view showing a comb-shaped cutter used by being attached to an endless chain or an endless belt, Fig. 9 is a side view showing another embodiment, and Fig. 1
0 is a sectional view taken along line B-B in FIG. 9, FIG. 11 is a partial side sectional view showing the operating state of the take-off bar used in the same embodiment, and FIG. 12 is a sectional view taken along line C-- in FIG.
FIG. 13 is a partial sectional view taken along line C, and is a sectional view showing an application example of the present invention. 1...Fixed heating plate, 2...Concave groove, 3...Endless chain, 4...Sprocket, 5...Drive mechanism, 8...
...Movable heating plate, 9...Drive device, 10...Carry-in table, 11...Carry-out table that also serves as veneer peeling, 12...Stopper.

Claims (1)

[Scope of Claims] 1. A drying device equipped with a fixed heating platen, a movable heating platen that can approach and move away from the fixed heating platen, and a transport mechanism for transporting a veneer to be dried between these heating platens. , forming a concave groove continuous along the conveying direction of the veneer on the heating surface of at least one of the heating plates, and having a protrusion protruding from the heating surface of the heating plate in the groove, and driving the heating plate. A drying device characterized by having an endless belt driven in the veneer transport direction by a mechanism. 2. The drying device according to claim 1, wherein the groove is formed in the fixed heating plate, and the endless band is disposed within the groove. 3. The drying device according to claim 1, wherein the grooves are formed in both the fixed heating plate and the movable heating plate, and an endless band is disposed in the groove of each heating plate. . 4. The drying device according to any one of claims 1 to 3, wherein the endless band is made of an endless chain. 5. The drying device according to any one of claims 1 to 4, wherein a veneer peeler for peeling off the veneer to be dried from the endless band is disposed at the end of the endless band in the conveying direction. 6. Shallow grooves are carved along the endless band on the surface of the heating plate facing the surface on which the protrusions are provided, and a rubber-like elastic body is embedded in the shallow grooves. The drying device according to any one of items 1 to 5.