JPS5917643B2 - How to deposit bonded veneer veneer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for depositing bonded veneer veneers.

Many adhesives used to join dried veneers harden instantly and exhibit adhesive strength, but adhesives for so-called green veneers with a moisture content of around 80 do not harden quickly. There are only a limited number of adhesives available, such as moisture-curable urethane resin adhesives that require several minutes to exhibit adhesive strength.

However, when such adhesives are used to join green veneers, the following problems arise.

In other words, since the adhesive is attached to the surface of the joint of the veneers, when the joined veneers are cut into a certain length and stacked, the stacked veneers will be glued together, and when peeled off. It takes time and effort to remove the veneer, and the veneer may tear if removed forcibly.

When joining veneers using the adhesive described above, the present invention takes into account the location where the adhesive is to be applied, and also takes other measures until the adhesive hardens and exhibits adhesive strength. The problem described in t was solved by maintaining the state in which a plurality of veneers continued to form a veneer of a constant length, that is, the initial bonding relationship position, and by considering the stacking method. Let's explain by example.

As shown in FIGS. 1 and 2, a carry-in conveyor 1, a carry-out conveyor 2, and a depositing device 3 are arranged from the upper side.

A phototube 4 for detecting the presence or absence of a veneer is provided on one hand side of the carry-out conveyor 2, and the drive and stop of the carry-out conveyor 2 is controlled based on the detection signal.

That is, a clutch brake (not shown) is used to drive the carry-out conveyor 2 when the phototube 4 is blocked by the veneer, and to stop it when it is not blocked.

Further, above the upper side of the carry-out conveyor 2, nozzles 5A and 5B are installed for spraying an adhesive, such as a moisture-curing urethane resin adhesive 19, which takes several minutes to harden and exhibit adhesive strength, for a short period of time to the single plate. Provided on both the left and right sides of the transport direction.

Nozzle 5A. 5B performs an operation of spraying the adhesive 19 toward the rear end of the veneer on the carry-out conveyor 2 once every time the phototube 4 changes from a blocked state to an unblocked state; The spraying agent 19 is operated by the nozzle 5.
Only one of the nozzles A and 5B performs the spraying, and each time the veneer hits the fixed length detection limit switch 22 provided on the lower side of the unloading conveyor 2, the spraying is performed by one of the nozzles that was in operation. The switch E associated with the limit switch 22 is configured so that the nozzle is stopped and the other nozzle is allowed to operate.
Equipped with

On the downstream side of the phototube 4, there are two tanks 6 for storing heated and melted Honmelt, and a cooling roll passes through the tanks 6 and adheres the yarn 7 to which the Honmelt is attached to the surface of the veneer under pressure. 8 are provided on the discharge conveyor 2 opposite to the tank 6.

Further, on the lower side of the cooling roll 8, there is a cutter 10 that moves up and down once toward the anvil roll 9 in response to a signal when the tip of the joined veneer sheet hits a limit switch 22.
Equipped with

Further, on the downstream side of the carry-out conveyor 2, a stacking device 3 configured as follows is arranged.

At the same height as the unloading conveyor 2, two movable supports 12 are arranged outside in the direction of movement of the veneers by cylinders 11. A belt 13 that is larger than the unloading conveyor 2 and a limit switch 21 that detects that the veneer has reached a fixed position
Equipped with

An elevating table 14 is arranged below the support body 12, and the elevating table 14
is equipped with a stacking table 16 via a large number of rollers 15, and the stacking table 16 is movable on the lifting table 14 in the same direction as the moving direction of the support 12 by the operation of a cylinder 17 fixed to the lifting table 14. do.

Here, the operation of cylinder 11 and cylinder 17 is configured to be controlled by a signal from limit switch 21.

That is, when the veneer advances on the support 12 and hits the limit switch 21, the cylinder 11 is first actuated by the signal to retract the support 12 outward and then return, while the cylinder 17 is activated. After an arbitrary minute time has elapsed after the signal is issued, the stacking table 16 is activated to move in one direction, and then, similarly after an arbitrary minute time, the stacking table 16 is moved in one direction by the signal that the veneer hits the IJ Mitswitch 21. A control circuit (not shown) including a timer or the like is configured so that the deposition table 16 is moved in the direction by the operation of the cylinder 17.

The present invention is configured as described above, for example, and its effects will be explained next.

Raw veneer with high moisture content immediately after cutting with veneer lace 1
When 8A is conveyed by the carry-in conveyor 1, it is detected by the phototube 4 and the carry-out conveyor 2 is driven.

There, the raw veneer 18A is transferred to the unloading conveyor 2, and the threads to which the real melt is attached are transferred to the raw veneer 1 by the cooling roll 8.
It progresses while being attached to the surface of 8A.

Although hot melt does not exhibit strong adhesion strength for veneers with high moisture content, it is sufficient to withstand the external forces that the bonded veneers are subjected to before being deposited.

When the green veneer 18A is transported as described above and the phototube 4 is no longer blocked by the green veneer 18A, one drive of the carry-out conveyor 2 is stopped, and the green veneer 18A stops and stands by.

Therefore, the nozzle 5A is activated as shown in FIG. 3 by a signal from the phototube 4, and the moisture-curable urethane resin adhesive 19 is
Spray in spots toward the rear end of the green veneer 18A.

Next, when the following green veneer 18B is conveyed by the carry-in conveyor 1, the front end of the green veneer 18B comes into contact with the rear end of the green veneer 18A, and the photocell is cut off and the unloading conveyor 2 is driven, so that the green veneer 18
The process progresses with the adhesive 19 attached to the joint between A and the green veneer 18B, and at the same time, the yarn 7 to which the hot melt is attached is moved from the surface of the green veneer 18A to the green veneer 1 by the cooling roll 8.
It is continuously adhered to the surface of 8B.

When the raw veneers 18A and 18B further advance and the rear end of the raw veneer 18B passes through the phototube 4 and is no longer blocked, the conveyor 2 stops and the adhesive 1 is discharged from the nozzle 5A.
Raw veneers 18A and 18 that were sprayed with No. 9 and bonded
B is on standby.

By repeating the above operations, the green veneers are sequentially joined to form a band-shaped group of veneers. When the front end of the green veneer 18A hits the limit switch 22, the cutter 10 moves up and down in response to that signal.
The joined raw veneer is cut to a certain length.

As a result, as shown in the plan view of Fig. 5, the joined veneers are held in close contact with each other by the threads 7 to which the hot melt is attached, and the adhesive 19 is attached to one side in the conveying direction to a certain length. The result is a veneer (hereinafter referred to as a fixed-length veneer) 20: Also, the signal from the limit switch 22 is transmitted to the switch E, and the nozzle 5A, which had been operating until now, is
is stopped, the nozzle 5B is enabled for spraying, and the adhesive 19 is sprayed on the opposite side of the raw veneer from the side of the green veneer being transported until the next signal is issued from the limit switch 22.

The fixed length veneer 20 advances downward with the movement of the conveyor 2, and when it reaches the position of the support 12, the belt 1
3 and is conveyed independently, and finally hits the limit switch 21.

Thereupon, the support body 12 is once horizontally moved outward by the operation of the cylinder 11, and the fixed length veneer 20 is dropped and deposited on the stacking table 16.

After an arbitrary minute time, that is, after the regular length veneers 20 are dropped and deposited, the cylinder 17 is activated, and the stacking table 16 moves to the side of the regular length veneers 20 to which the adhesive 19 is attached and waits.

Next, in a similar operation, adhesive 19 is applied to the joint part by the nozzle 5B in the opposite direction of travel to that of the fixed-length veneer 20, and the fixed-length veneer 20' held by the thread 7 is conveyed. Been,
Similarly, when the limit switch 21 is hit, the support body 12 moves horizontally and the fixed length veneer 20' is deposited on the stacking table 16.

At this time, since the stacking table 16 moves horizontally after depositing the fixed-length veneer 20, even if the next fixed-length veneer 20' is deposited, the adhesive on the surface of the fixed-length veneer 20 has not yet hardened. The agent 19 does not come into contact with and adhere to the regular length veneer 20'.

After depositing the length veneer 20', the cylinder 17 is actuated to move the length veneer 20 in the opposite direction to that for the length veneer 20.
The deposition table 16 moves to the side to which the adhesive 19 of 0' is attached.

As described above, in the above-mentioned embodiment, when joining green veneers, the adhesive 19 is applied to a location offset to the left or right side in the direction of movement of the first veneer, and the green veneer is bonded with the thread 7. While keeping the boards in close contact, the joined green veneers are cut every time the length reaches a certain length, and the adhesive 19 is applied alternately to the left and right sides in the direction of movement of the green veneers. After the changed and joined regular-length veneers are stacked on the stacking table 16, the stacking table 16 is alternately moved to the side of the regular-length veneers to which the adhesive 19 is attached.

Therefore, when the stacked regular-length veneer group is viewed from the lower side of the stacking table 16, the parts to which no adhesive is attached overlap, as shown in FIG. It does not come into contact with the shaku veneer and stick to it.

These stacked standard size veneers are dried in the next step, and the adhesive 19 hardens during the stacking time and the time until drying in the next step, and exhibits sufficient adhesive strength.

In the drying process, hot air at around 150 degrees Celsius is normally blown onto the green veneer to dry it. Hot melt melts at around 120 degrees Celsius, and the threads 7 will peel off, but the adhesive 19 will exhibit sufficient adhesion. Therefore, the bonded state will not collapse.

Although the adhesive 19 is applied only to one end of the regular length veneer and not to the entire surface, it is sufficient to maintain the bonding state of each individual veneer, and even after drying, it remains as one continuous veneer. It is possible to treat it as

Although the present invention has been described above using one embodiment, individual means may be changed as appropriate.

That is, in the above example, a thread coated with hot melt was used to maintain the tightness of the raw veneer of a fixed length, but a cut was made with a knife or the like on the end or surface of the raw veneer. However, a thread may be inserted into the cut to maintain the green veneer in close contact with each other.

Alternatively, without using these special joining means, the green veneer may be held between upper and lower surfaces by belts, and the adhesive 19 may be applied while the green veneer is kept in close contact with each other, and deposited as in the above embodiment. .

On the other hand, the adhesive 19 is deposited at one location on the left and right side of the blade edge in the direction of travel of the veneer in the example, but as shown in FIG. 7, it is deposited at several locations on one end side. At this time, the side of the fixed length veneer to which the adhesive 19 is attached may be pushed out by an appropriate amount, and the adhesive 19 may be deposited without adhering to other veneers.

As described above, in the present invention, when veneers are bonded using an adhesive that takes some time to harden and exhibit adhesive strength, and the adhesive is deposited after being cut to a certain length, the adhesive hardens. Until then, other means are used to maintain the state in which multiple veneers continue to form a veneer of a certain length, that is, the close contact state of the green veneers, so the veneers are separated. Don't let it happen.

Further, the adhesive is attached only to one end side of the veneer,
Moreover, each time the total length of the joined veneers becomes constant, the adhesive is alternately applied to the other end of the veneer,
When the veneer is deposited one by one, the parts of the veneer to which the adhesive is not attached overlap.
There is no problem caused by the adhesive adhering to the upper or lower veneer.

[Brief explanation of the drawing]

The drawings are for showing an embodiment of the present invention, and FIG. 1 is a side view of the embodiment, FIG. 2 is a plan view of FIG. 1, FIG. 3, FIG. 6 and 7 are plan views of the regular length veneers, and FIG. 8 is an explanatory view showing the stacked state of the regular length veneers. 1...Incoming conveyor, 2...Outgoing conveyor, 4...Phototube, 5A, 5B...
Nozzle, 10...Knife, 16...Piling table, 17...Ulinder, 18A, 18B...
...Raw veneer, 19...Moisture-curing urethane resin adhesive, 20...Standard length veneer.

Claims (1)

[Scope of Claims] 1. A step of bringing the front and rear ends of the veneer veneer to be conveyed into close contact with each other and maintaining this state to form a band; a step of attaching an adhesive to a location offset to either the left or right side in a right-angled direction; and cutting the strip-shaped veneer veneer into a fixed-length veneer each time the length of the strip-shaped veneer becomes constant; and a step of changing the adhesive attachment point to an area that is offset to one side opposite to the above, and changing the fixed length veneer to the adhesive attachment point of the previously deposited fixed length veneer. A method for depositing bonded veneer veneers, comprising the steps of depositing them in non-overlapping positions.