JPS5861867A - Adhesive supplier for veneer - Google Patents

Abstract

PURPOSE:To adhere even a veneer with a high water content, by drying an adhesive before it is supplied to a veneer, and then supplying the dried adhesive to the veneer. CONSTITUTION:The external surfaces of cooling rolls 6 rotating as shown by arrows are applied in a thin film with adhesives 4 by coating rolls 5, and then the rolls 6 transfers films of the adhesives to the external circumferential surfaces of heat rolls 7 at contacting positions of the heat rolls 7. While the water contained in the adhesive is vaporized, the adhesives are carried as shown by arrows and dried properly before peeled in thin films with peeling knives. The peeled thin-film adhesives 4' are supplied between a top plate 2 and a reverse plate 3 conveyed by conveyors 10 and press rolls 9, and an intermediate plate 1 and the veneers 1-3 are adhered together temporarily by the pressing of the rolls 9 and carried out. Then, the adhesives are cured while heat pressure clamping after cold pressure clamping or cold pressure clamping is performed at need.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention mainly relates to an adhesive supply device (ζ) for veneer veneers, which is used based on a plywood manufacturing method that improves the bonding technology for veneer veneers with a high moisture content.

Conventional 1 In the adhesion technology of veneer veneers (hereinafter referred to as veneers) in the plywood manufacturing process, the biggest cause of adhesion failure such as punctures or insufficient adhesive strength is the dry state of the veneer,
That is, it is well known that this is caused by the moisture content of the veneer.

However, it is currently impossible to make the moisture content of all veneers uniform after drying, and there are large and small variations. In particular, the deterioration of the raw wood situation in recent years has resulted in a significant mix of tree species that are difficult to dry and those that are easy to dry. If it is lowered, various problems such as poor adhesion due to insufficient drying will become apparent at production sites.

Therefore, it is impossible to deal with the current situation and the future without developing practical adhesive technology that is not affected at all or is not easily affected by fluctuations in moisture content. To fundamentally solve this problem, it is necessary to establish a technology that allows bonding of veneers with high moisture content.

By the way, with regard to adhesion technology for veneers with high moisture content, for example, there exists, for example, Japanese Patent Publication No. 54-8929 (title of invention 2: Method for manufacturing plywood). According to the publication, this adhesive technology involves applying a plywood adhesive with a known composition to a veneer, allowing the applied adhesive to dry, and then stacking another veneer on top of it and heat-pressing it. oriented. However, although all of the disclosed results show good results, the following problems are inherent in this technique. That is, a drying device is installed to dry the applied adhesive.

Even if drying conditions consisting of a predetermined temperature and time are set, veneers with a low moisture content may be overdried, or conversely, veneers with a high moisture content may be insufficiently dried. Not only is it impossible to dry the adhesive applied to such a degree, but the adhesive strength after hot pressing also varies significantly and becomes extremely unstable.

This is clear from the fact that the drying conditions in the disclosed examples are variously set depending on the moisture content of the target veneer, and the higher the moisture content, the greater the drying conditions. This is due to the phenomenon that the degree of drying of the applied adhesive is not simply determined by the set adhesive drying conditions l'c, but is largely influenced by the moisture content of the veneer. Therefore, the drying equipment for the applied adhesive has been made considerably larger and has a larger capacity than conventional veneer drying equipment.
In addition, it is well known that there are usually significant differences between the sapwood and core of a single log, and even depending on the location of a single veneer; Considering the problem of producing plywood of stable quality with high moisture content veneer, the drawbacks of this type of technology are difficult to overcome in the practice of plywood manufacturing, which operates in a mass production format, and it is still difficult to overcome. It was insufficient for practical use.

The present invention solves the above-mentioned problems and improves them in order to eliminate the drawbacks of the conventional techniques described above.

Supplying adhesive to veneers, which forms the basis of an adhesive technology that can be easily put into practical use at production sites and is capable of adhering even high moisture content veneers well without being affected by the moisture content of the veneers. It provides equipment.

Namely, the veneer adhesion technology according to the present invention, as directed by the technology described in the above-mentioned publication, actively removes moisture in the adhesive and makes it possible to bond veneers with a high moisture content. Although it is a bit of a hassle.

Rather than drying the applied adhesive after applying the adhesive to the veneer, the adhesive should be dried before being supplied to the veneer and then supplied to the veneer. It is based on Therefore, the adhesive drying device can be significantly downsized, and the adhesive can be stably dried as desired only by the set drying conditions, and the drawbacks of the technique according to the above-mentioned publication are solved at once.

Regarding the apparatus of the present invention for rice grains, a preferred embodiment thereof is shown in FIG. 1, so (5) will be explained based thereon first.

In the figure, 4 is an adhesive, 5 is a coating roll, 6 is a cooling roll,
Reference numeral 7 indicates a heating roll, and 8 indicates a peeling knife. As is clear from FIG. 1, the coating roll 5 coats the adhesive 4 in a thin film onto the outer peripheral surface of the cooling roll 6, which rotates in the direction of the arrow.

Then, the cooling roll 6 is heated to 1 at the contact position with the heating roll 7.
The thin film adhesive is transferred onto the outer peripheral surface of the heating roll 7. and on the outer peripheral surface of the heating roll 7.

The adhesive is transferred in the direction of the arrow while evaporating the moisture contained therein, and after being dried appropriately, it is peeled off as a thin film by a peeling knife 8. Peeled thin film adhesive 4'
is conveyor 10. As shown in Fig. 1, the veneers 1, 2, and 8 are temporarily bonded by being supplied between the top plate 2 and back plate 3 and the middle plate 1, which are conveyed by the pressure roll 9, as shown in Figure 1. and transport it out. After that, although not shown in the figure, the veneers are bonded as usual by cold pressing and then hot pressing, or by curing the adhesive in the cold pressed state □.

(6) Next, an example of drying the adhesive 4 using the apparatus shown in FIG. 1 is as follows. Note that "parts" refers to parts by weight.

Experimental example: (1) Composition of adhesive 4; the base glue was a melamine urea cocondensation resin adhesive (varnish resin manufactured by Shoei Chemical Industry Co., Ltd., product number 5A-(stock)).

(contains about 54% non-volatile resin component) 100 parts.

20 parts flour, 4 parts water, 1 part ammonium chloride.

(2) Temperature of cooling roll 6; 15; (8) Amount of adhesive applied by coating roll 5 to cooling roll 6; 159/square; (4) Outer periphery of cooling roll 6 and heating roll 7. Ratio of speeds on the surface: 1:1, +51 Temperature of the heating roll 7: 90, (6) Time during which the wetting agent applied in a thin film substantially stays on the heating roll 7: 18 (7) Ratio between the speed at the outer peripheral surface of the heating roll 7 and the speed at which the thin film adhesive 4' is supplied to the veneer; 'l to 1° Under the above conditions, the peeling knife 8 The peeled thin film adhesive 4' was continuously obtained in a soft thin film form and was automatically fed between the plates 1 and 2.8. still.

The thin film adhesive 4' has a weight of 125 before drying.
Therefore, the weight was 100, and when the bone dry weight (weight of all non-volatile components) was measured, it was about 75.

In connection with the above experiment, an adhesion test was conducted on 8-braid plywood manufactured by supplying the thin film adhesive 4' between the veneers as described above, and the results were as follows. It is as follows. That is, a front and back veneer with a moisture content of 10% and a thickness of 1.7 nm, and a medium veneer with a thickness of &61111° and a moisture content of θ~120% were heat pressed at 115"C for 8 minutes. 1
The adhesive strength of similar plywood was determined based on the repeated boiling test method stipulated by JAS, and the adhesive strength of t was found to be 1. This was the case with plywood in which the moisture content of the medium veneer was approximately 80 to 55%.

Furthermore, even with plywood using intermediate boards with moisture content outside the above range, the bonding was quite good.

The electric power and drying degree of the thin film adhesive 4' were adjusted according to (
By changing the conditions in items 5) and (6) to make it higher than the above experimental example, we created a dryer thin film adhesive, produced plywood in the same way, and conducted an adhesive strength test. was obtained in a plywood using a medium board with a higher moisture content than in the previous example.

In contrast, when we lowered the degree of drying of the adhesive and used a thin film adhesive that did not dry out, high adhesive strength was obtained on plywood using medium board with a lower moisture content.

In this manner, the apparatus according to the present invention can supply the dried adhesive between the veneers while drying the adhesive as desired under various conditions, thereby producing an adhesive with a low moisture content. It is clear that this method is intended for bonding veneers with a high moisture content and forms the basis of the bonding technique described above. However, when drying as described above is carried out at a certain level of drying in this device, the adhesive tends to stick to the peeling knife 8 provided when peeling the adhesive, resulting in a phenomenon that makes peeling difficult. Invite. Therefore, when carrying out such light drying to supply adhesive between the veneers (9), it is necessary to dry the adhesive between the veneers 2 and 8, as in the apparatus illustrated in FIGS. A device is used that directly contacts the outer peripheral surface of the heating roll 7.

That is, a veneer conveying device using a pressure roll 9' or the like is installed to transfer the dried adhesive to the adhesive surface of the veneer. Note that the other members in FIG. 1 are the same as those in the device shown in FIG. 1, and the details will be described later. In addition, if the degree of drying of the adhesive 4 is increased to a certain level and the drying described above is carried out, the opposite is true.

The thin film adhesive 4' is broken and peeled off by the peeling knife 8. Therefore, in order to supply the adhesive between the veneers by drying the adhesive thoroughly, the broken adhesive should be spread as uniformly as possible on the adhesive surface of the veneers (not shown in the figure). In addition, a spraying device is attached to the peeling knife 8 so that the spray can be sprayed without any gaps. In this case, when uniformly distributing thin film pieces that have been crushed in a disorderly manner or in an orderly manner, a crushing device for further crushing the thin film pieces is attached in conjunction with the peeling knife 8, and the thin film pieces are crushed into powder. It is more effective (lO) to spray with a sprayer after spraying.

In any case, it is important to set the drying conditions or other conditions for the adhesive so that it can be easily peeled off as a thin film by the peeling knife 8.
As shown in Figure 1, it becomes extremely simple. Hereinafter, the matters that serve as a guideline for drying the adhesive in this manner will be described in detail.

First, let's talk about the moisture content of the adhesive. In the present invention, a known water-soluble plywood adhesive mainly composed of urea resin, melamine resin, puenol resin, water-based vinyl urethane resin, or co-condensed resin or mixed resin thereof is used as the adhesive. These adhesives are usually 40 to 55
It is commercially available as an aqueous solution containing water.

Use these as a base glue, and add water, flour, ammonium chloride, and other thickeners as necessary.

A curing agent and other additives such as a plasticizer and a filler are added, and the mixture is prepared into a commonly used standard formulation or a known special formulation, and then supplied to the apparatus of the embodiment shown in FIG. At this time, depending on the type of base glue, the adhesive 4 should be in a liquid form with less moisture.

The moisture content is preferably approximately 86 to 70%.

Next, using the apparatus of the present invention, a considerable amount of moisture may be removed from the initial state to create a thin film adhesive 4', but the moisture content should be within the range of approximately 15 to 85 cm. Desirably, the moisture content is about 18 to 88 inches.

Set the drying conditions of the device. In addition, in the case of the above experimental example,
, Adhesive 4 prepared with an initial moisture content of 40% was used and dried to about 25%.

Furthermore, if the adhesive 4 is dried under heated conditions as in the apparatus shown in FIG. Before reaching this point, the adhesive performance of the thin film adhesive 4 tends to deteriorate or its ductility tends to be lost. Therefore, when drying involves heating, the temperature is desirably about 110"C or less.

However, on the other hand, since drying at a high temperature of 100°C or higher has the advantage of being able to be achieved in a very short time, it is necessary to carry out the drying at a high temperature while suppressing the progress of the condensation reaction as necessary. Sometimes. For example, by adding a hardening agent such as ammonium chloride to a trace amount to zero, or by adding hexamethylenetetramine, etc., the pH of the adhesive 4 is adjusted to weak acidity, neutrality, or alkalinity. The drying process is carried out on the stone. Of course, this kind of PH operation of the adhesive 4 can be employed even when drying is carried out at a low temperature of 40 to 100 ° C. or at room temperature without heating the heating roll 7 at all. In the case of employing the adhesive, ammonium chloride or the like is added to the thin film adhesive 4' or the bonding surface of the veneer when supplying the dried wafer adhesive 4' to the veneer.

It is desirable to readjust the pH to improve adhesive curing conditions under hot or cold pressing.

In addition, in anticipation of the condensation reaction that will proceed during the drying process at such an arbitrary temperature, the degree of condensation of the base glue used may be lowered in advance.

(13) However, if the progress of the condensation reaction does not cause any particular problems such as deterioration of the adhesive performance or loss of ductility, on the contrary, the -xlj route is changed to the high condensation type g) in which the degree of condensation is increased in advance. It is also possible to use

On the other hand, increasing the ductility of the thin film adhesive 4' facilitates smooth and stable supply between the veneers, and also provides good adhesion to the veneers even after being supplied between the veneers. This is important in terms of ensuring safety. Therefore.

In order to increase the ductility, if necessary, known plasticizers are added to the base glue used.

For example, in the case of an amino resin adhesive, an appropriate amount of a plasticizer such as tricresyl phosphate or cresyl diphenyl phosphate is added.

Additionally, this type of plasticizer often has the function of a lubricant as well, and therefore also improves the releasability of the thin film adhesive 4' to some extent. but.

Basically, the ductility of the thin film adhesive 4' largely depends on the degree of dryness of the adhesive 4.

That is, a thin film adhesive 4' having a relatively high water content has a high ductility, while a thin film adhesive 4' having a low water content tends to have a low ductility (14). Incidentally, 80g of item (8) in the above experimental example
/square, term (6) to 87 seconds, and term (7) to 1
:8, 1:2, 1:1.5, but the moisture content of the thin film adhesive 4' after drying was about 82 inches, which was higher than that of the experimental example. It was in a softer and more ductile state.

In addition, the ratio of the speed at the outer circumferential surface of the heating roll 7 in item (7) above and the speed at which the thin film adhesive 4' is supplied to the veneer is l.
By changing from =1 as described above, the adhesive on the heating roll 7 is.

The peeling knife 8 removes the veneer while reducing its thickness based on the speed-up ratio, but if such speed-up peeling is actively employed, a thin film can be created to meet the various conditions of the veneer to be bonded. A technique is established in which the thickness of the adhesive 4' can be freely adjusted. Specifically, in the apparatus shown in FIG. 1, the veneer conveyance and feeding device is configured so that the conveyance speed thereof can be set at a desired speed increase ratio. Of course, the same effect can be achieved even if the speed of the outer peripheral surface of the heating roll 7 can be lowered freely, but in the case of the apparatus of this embodiment, a change in the rotational speed of the heating roll 7 changes the drying conditions of the adhesive.

Furthermore, these nine types of accelerated peeling also make it possible to peel off moderately dry adhesive from the outer peripheral surface of the heating roll 7 before the peeling knife 8, if necessary. In this case, the peeling position is set in accordance with the above-mentioned speed without particularly requiring a peeling device such as the peeling knife 8. But in any case.

The delayed operation of the drying adhesive, which changes the thickness of the thin film at the time of drying of the adhesive and the thin film thickness at the time of supplying the veneer, produces a thin film adhesive 4 with some kind of agitation phenomenon when the thickness changes. ′
Achieve ultra-thin flowers.

This is in accordance with the Zenhon principle of adhesion, in which ultra-thin and uniform adhesion is best. The following is a disclosure of the basic matters.

The apparatus of the present invention will be described in detail below using one embodiment shown in the drawings and other examples.

First, attention will be paid to the cooling roll 6° and the heating roll 7 of the apparatus shown in FIG. 1. The outer peripheral surfaces of these two rolls constitute a transfer surface that transfers at a predetermined speed. That is, the coating roll 5 is located between the coating position where the adhesive 4 is applied to the outer circumferential surface of the cooling roll 6 and the peeling position where the peeling knife 8I is applied, and is substantially used as a conveying medium for the adhesive and agent. It forms a transfer surface that forms a . As described above, the heating roll 7 constitutes one cloth of the transfer surface, and also functions as an adhesive drying device.

Further, the cooling roll 6 stabilizes the coating amount by the coating roll 5 while keeping the adhesive 4 at a low temperature immediately before coating at the coating position, and also prevents the transfer of the adhesive to the heating roll 7. It's smooth. That is, the cooling roll 6 is provided primarily to eliminate coating failures caused by heat transfer from the heating roll 7. Therefore, in addition to setting the temperature of the heating roll 7 to a low temperature, especially when no coating failure is caused.

It is not necessary to install cooling means such as the roll. Therefore, a coating device such as a coating roll 5 may be installed directly on the outer peripheral surface of the heating roll 7 to set the coating position (17) of the adhesive 4. In such a case, the transfer surface is composed of a single member such as the outer peripheral surface of one roll, and the drying device dries the adhesive over the entire area from the coating position to the peeling position. It will be implemented.

Regarding the electric power and coating roll 5, the roll is cooled if necessary to ensure stable coating on the transfer surface. When performing accelerated peeling as described above, the coating amount is relatively thick and the coating is applied in the form of a thin film. In relationships.

Allows for gap adjustment. 7 again. The rotation direction or rotation speed of the transfer surface relative to the transfer direction may be the same as usual. In addition, any coating equipment such as a coating roll 5I rotating blade coater, spray, or other coating equipment capable of coating, casting, or dispersing adhesive in a thin film may be installed in relation to the transfer surface. It is possible.

Also, by a combination of two or more arbitrary members, such as the outer peripheral surfaces of two rolls, the cooling roll 6 and the heating roll 7, an endless belt and an endless belt (18), an endless belt and the outer peripheral surface of a roll, etc.

If a series of transfer surfaces are formed by appropriately dividing the transfer surface in the transfer direction, the transfer speed of the transfer surfaces can be relatively adjusted. For example, in the case of the illustrated apparatus, the feeding speed ratio of the outer circumferential surfaces of the cooling roll 6 and the heating roll 7 is set to 1=1;
:Also in 2.

It can also be set to 2:1. Adjustment of this type of speed ratio allows the adhesive thickness on the transfer surface to be adjusted as required during the transfer of the adhesive.

Further, regarding the transfer surface, the transfer surface does not necessarily have to be a flat surface. For example, the cooling roll 6 in the device shown in FIG. 1 may be coated with rubber and have many small screw-shaped grooves formed on its outer circumferential surface, like a well-known spreader roll, and the heating roll 7 may be coated with hard chrome. It can also be a plated flat rigid surface. Of course, it is possible to add desired unevenness to the outer surface of the heating roll if necessary, but since the shape of the transfer surface has a considerable effect on the thin film adhesive 4', it is possible to add desired unevenness to the outer surface of the heating roll. The gap is set based on the state of the thin film adhesive 4 to be used. For example, 0.08
I.

Those with a uniform thickness of 0.07 mm, 0.1 mm, 0.15 mm, 0.2 mm, etc., those with uneven thickness actively formed in the feeding direction and the lateral direction, or in the feeding direction, Along the line extending in the supply direction, 1 as if cut and separated.
Items with narrow widths lined up in the direction of the groove, and items with extremely narrow thread-like items lined up in the same way, giving the overall shape of a thin film: Other shapes The geometric state of the transfer surface is set depending on the state. Furthermore, since it is largely related to the state of application of the adhesive by a coating device, etc., it is also possible to preferably create a desired thin film adhesive by controlling the state of application or by using a combination thereof.

Next, regarding the drying device for drying the adhesive coated on the transfer surface, in the device shown in FIG.
As mentioned above, is the main device.

In the case of this type of drying device, the applied adhesive is heated and dried from one side, but a drying device that heat-dries the coated adhesive from both sides can also be used if necessary.

Moreover, if a microwave drying device is attached, heating drying can be carried out from inside. All of these drying devices involve some kind of heating at a certain temperature, including well-known thermal radiation type, thermal convection type, and thermal conduction type drying devices, such as pigeon drying devices, vacuum drying devices, etc. If this method is adopted, drying can be carried out at normal temperature (room temperature). In any case.

The installation position of the drying device is on the transfer surface.

As long as the adhesive is dried between the coating position and the peeling position, the position and installation range are not particularly limited.

In addition, when the peeled thin film adhesive is further dried at the peeling position using a peeling knife or the like, an arbitrary drying device may be provided as necessary other than natural drying.

Regarding the peeling device, in addition to the peeling knife 8 shown as an example, a contact type device such as a known air knife can also be used. and.

The peeling position set by the device does not necessarily have to be set fixedly, but may be movable such that the peeling knife 8 shown in the figure is movable on the transfer surface. It is convenient to adjust the drying degree of the adhesive if configured as follows.

In addition, in the device shown in Figure 1, the peeling knife 8 separates from the conveying surface at an appropriate time and applies the tip of the dried adhesive to any location on the adhesive surface of the veneer that is being conveyed or is stopped. If a transfer mechanism using the knife is provided so that the adhesive is transferred and then returned to its original position, it becomes extremely convenient to start supplying the thin film adhesive to the veneer at the start of one operation.

Regarding the transportation device for paddy veneers, as shown in the embodiment shown in FIG.
Any configuration may be used as long as it is possible to supply the thin film adhesive to at least one of the adhesive surfaces. In the case of the illustrated device, the middle veneer 1 is straight.

The other top veneer 2 is conveyed in a curved line (22) along the pressure roll 9, either continuously or intermittently, but the manner in which the two are conveyed can be changed as desired. In addition, as shown in Figure 1, when supplying the thin film adhesive 4', 2
When the conveying device is configured to feed one of the adhesive surfaces of two veneers first and then the other, one side should be close to each other or at least lightly in contact with each other, as shown in the third figure. After a short period of time and a short distance, the other side comes close to each other, or at least lightly touching each other; Good too. Of course, both adhesive surfaces are applied at almost the same time,
They may be in close proximity or at least lightly in contact with each other, and furthermore, the thin film adhesive 4 may be in contact with either adhesive surface.

Keep it close and extend it at the right time.

It may also be a conveying device in which adhesive surfaces having a certain area are brought into substantially simultaneous contact, at least lightly. In such a case, if the thin film adhesive extends close to the veneer, it is considered that it has already been supplied between the bonding surfaces of the veneer.

In addition, it is not always necessary to apply pressure while supplying a thin film adhesive between two veneers, as in the case of the pressure roll 9 shown in FIG.
It is sufficient to interpose a thin film of adhesive between the veneers under their own weight. This is because the state of temporary adhesion may be performed in a subsequent step, if necessary. In addition, the pressure roll 9 is
It is desirable that the outer peripheral surface is coated with an elastic material, and if necessary, 1
Any number of grooves may be formed in the circular direction.

The groove allows tensioning of a single feed member such as a needle belt and improves the curved conveyance of the veneer. Further, if necessary, the pressure roll 9 can be a heated high-temperature roll.

Also, since the illustrated apparatus is an embodiment for 8-brie plywood, the two veneers to be bonded are as follows.

Two sets of middle plate veneer 1 are used as a common veneer (drawing number l and 2.1
and 8), and a thin film adhesive 4' is supplied to each of them, but suppose that instead of the medium veneer 1, the one discharged from the pressure roll 9 shown in the figure is used after the adhesive hardens or as it is in the fiber direction. If the pressure rolls 9 are adjusted as desired and carried in again, the pressure rolls 9 will be carried out in the form of 5 braises. Also, if we replace raw veneer II and supply two stacked veneers, two sets of two veneers will be carried out. In this way, the device of the present invention is basically attached regardless of whether the fiber directions are crossed or parallel.

I'm going to construct it as described above, with two veneers to be glued together, without any connection.

If necessary, target two sets of one set or multiple sets,
It is often constructed as a combined device that supplies thin film adhesive to these devices simultaneously or at some distance or time. In such a case, the apparatus is mainly designed so that the veneer conveying device is shared by each group. For example, the pressure roll 9 is one example.

In addition, in the apparatus shown in Figure 1, each veneer is cut into a predetermined length in advance, and the veneers are brought in with the gaps narrowed as necessary, and any veneer can be cut into a predetermined length. Alternatively, all of the veneers can be delivered in a continuous long strip.

(25) Regarding the moisture content of the veneer used, as is clear from the results of the adhesion test described above, the moisture content of the veneer was as low as described above by the device of the present invention and other devices. As disclosed above, the lower the moisture content of the adhesive, the higher the adhesive strength when adhering to a veneer with a high moisture content. Therefore, it is desirable to adjust the moisture content of any veneer used in advance based on this tendency. In addition to uniformly performing such operations on the entire veneer from the inside to the surface layer, such operations are performed mainly on the adhesive surface layer as needed. For example, when using a veneer whose moisture content is too high, a known veneer heating device such as a heating flat plate or a heating roll is installed in conjunction with the apparatus of the present invention.

After drying the surface layer of the adhesive surface by heating and drying for a short period of time, the adhesive is preferably supplied by the apparatus of the present invention while there is a difference in moisture content between the adhesive surface and the inside.

After that, it is transported to the cold pressing and hot pressing processes.

In this case, the veneer may be brought into the apparatus of the present invention with a rise in temperature, but the retained heat (26) of the veneer will be used for subsequent hot pressing or cold pressing. It may also contribute to the hardening of the adhesive.

In some cases, for the purpose of increasing the temperature of the veneer.

A similar heating device may also be installed.

On the other hand, in the case of a veneer whose moisture content is too low, for example, water, hot water, steam, other formalin, various adhesives in water-soluble state, etc.
Spraying of acidic aqueous solutions such as diluted hydrochloric acid or ammonium chloride water, etc., with water as the main ingredient and a secondary target added.

It is desirable to install a humidifying device that humidifies the surface layer of the adhesive surface of the veneer by coating. Of course, it may also be installed together with the veneer heating device.

However, it is more preferred that the adhesive film 4' corresponds to the moisture content of the veneer to be used. For example, a veneer moisture content meter is provided to detect the moisture content of the veneer, and based on the detected content, the degree of drying of the thin film adhesive 4' is automatically or manually adjusted. For example, as shown in Figure 2,
A moisture meter 11 is installed to detect the water condition of the IIM type adhesive 4', and based on the detection contents of the moisture meter 11 and the veneer moisture content meter, the humidifying spray shown in FIG. 8 is automatically applied. Alternatively, it can be configured to be operated manually.

In this case, desirably, one humidifying spray 12 is provided on each side of the thin film adhesive 4', so that the amount of steam ejected for humidification can be controlled individually.

In addition, the optional thin film adhesive humidifying device such as the humidifying spray is 8
Basically, it is provided at any position for the thin film adhesive supplied between the veneers from the peeling position, but if necessary, for the adhesive present on the transfer surface before being peeled off. I'll prepare the L tag again. Not only steam, but also hot water, water-soluble adhesives such as Polmarine, acidic aqueous solutions such as diluted hydrochloric acid or ammonium chloride water, and water containing various additives added to adhesives. It is also possible to add a target substance to the thin film adhesive 4'. However, when C and mainly water are added like this.

Although it depends on the composition of the thin film adhesive and the degree of drying, its moisture content should be approximately 5 g or less per square meter on one side, preferably a trace amount of about 8.6 to 0.89 g.

That is, since the thin film adhesive 4 has a lower moisture content, it tends to lack permeability (wetting, bonding) to veneers, and this tendency is particularly low for veneers with low moisture content. Although the addition of a small amount of water significantly improves this tendency,
This rewetting technology has an extremely large effect.

For example, the plywood subject to the above-mentioned adhesion test was manufactured by nailing low moisture content veneer to the top veneer and back veneer, but most of the veneers did not break at the bonding surface without causing wood damage. This occurred between the board and the adhesive surface. Therefore, steam was sprayed onto both sides of the thin film adhesive, and plywood was produced again under the same conditions, with the aim of leaving approximately 0.89 moisture per square meter on each side, and an adhesive strength test was conducted. However, the adhesion of this area was greatly improved. Conversely, if the adhesive surface layer of the low moisture content veneer is moderately humidified,
Similar improvements in adhesion were obtained when a veneer with a moderately high moisture content was tested in the same manner.

As described in detail above, even if the device of the present invention could be implemented in the past (29), it would be expensive, the equipment would be large, and the process would be complicated, making it insufficient for practical use. It forms the basis of a new bonding technology that can be achieved extremely easily, including bonding high moisture content veneers, as well as low moisture content veneers as needed. To realize veneer adhesion that solves the problems of veneer shrinkage, cracking, and poor adhesion all at once due to the extremely difficult drying of the veneer, thereby contributing to the current and future plywood manufacturing industry. Very obvious.

Note that the present invention device is applicable not only to veneers but also to other types of sawn boards.
Sheet-like materials made of any material, such as plywood, wood boards, 9 papers, and 1 plastic.

In the production of a laminate in which plate-like objects are laminated and bonded in a desired combination, it can also be provided as a supply device for a thermosetting water-soluble adhesive.

[Brief explanation of the drawing]

What is shown in FIGS. 1 to 5 is an embodiment of the present invention (30), and FIGS. 1, 4, and 5 are side views of different embodiments, and FIGS. FIG. 2 is a partial side view. In the figure, 1...Middle plate veneer, 2...Top veneer, 8...Back plate veneer, 4...Adhesive, 4'...Thin film adhesive, 5...Coating roll, 6 ...Cooling roll. 7: heating roll, 8: peeling knife, 9: pressure roll, 9': pressure roll, 11: moisture meter 12: humidifying spray. Patent Applicant' Meinan Seisakusho Co., Ltd. 5 67 Procedural Amendment (Police 6) November 21, 1980 Director General of the Patent Office Haruki Shimada 1, Indication of the Case Patent Application No. 161696 of 1981 '2, Title of the Invention Plywood veneer edge 4 salt sound) A lost ship - 14 3. Relationship with the case of the person making the amendment Patent applicant postal code 474 Telephone (0562) 47-22
11 Address: 3-130-5 Kajita-cho, Obu City, Aichi Prefecture
, Target of correction B) One mouthful of whole milk

Claims (1)

[Scope of Claims] The present invention is equipped with a coating device for coating a plywood adhesive such as a grass resin adhesive in a thin film on the transfer surface. An adhesive drying device for reducing the moisture content of the thin film adhesive Q is provided at a position downstream from the adhesive coating position of the device in the transport direction of the transfer surface, and a peeling device is further provided at a downstream position as required. A peeling position is set at which the adhesive is peeled off from the transfer surface, and the thin film adhesive peeled off at the peeling position is supplied to the adhesive surface of the veneer veneer. A device for supplying adhesive to a veneer veneer, comprising a veneer veneer conveying device.