JP2009166446A - Method of bonding between joined veneer and substrate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To manufacture with superior productivity a board by bonding veneers in a plurality of layers with a thermosetting adhesive even in using veneers joined in a direction of fibers. <P>SOLUTION: In a slope 9a coated with an adhesive on the entire surface of a veneer 9 and a slope 11a of a veneer 11, one end 9b and the other end 11c, and the other end 9c and one end 11b while they are opposite to each other, are heated for five seconds and tightened with pressure between a projection 1a and a projection 3a to form temporarily joined veneers V1, V2.... Then, two of the temporarily joined veneers are superimposed through an adhesive, heated for 2 minutes and tightened with pressure to form a first board W1. Subsequently, the temporarily joined veneer is superimposed on the top and the rear surface of the first board W1 through an adhesive, heated for 2 minutes and tightened with pressure to form a second board W2. Thereafter, the operation is similarly repeated for the suitable number of sheets to manufacture board. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for bonding a bonded veneer and a substrate.

Conventionally, a plurality of dry veneers (hereinafter referred to as “single plates”) are bonded together by heat-pressing them with a thermosetting adhesive (hereinafter referred to as “adhesive”) such as a phenol resin adhesive. A plate material such as a single plate laminated material or a plywood having a predetermined length is manufactured.
At this time, when the length of the single plate in the fiber direction is shorter than the predetermined length, for example, the ends of the single plate subjected to oblique scarf processing are joined with an adhesive, and cut as necessary to obtain a predetermined length. That is done.
Further, as described in Patent Document 1, as a method of joining, at least one raw veneer of predetermined green veneers to be bonded is processed to form a portion thinner than the predetermined thickness. Then, one thin portion and the other green veneer end are overlapped with an adhesive, and then at least the thin portion is pressed with a heating body, so that all surfaces of the joining surface are There is a method in which the adhesive is cured only in the thin part or only in a part of the thin part and bonded to the other raw veneer.
In this method, as described above, the adhesive is cured and bonded by only the thin part or only a part of the thin part, and the entire adhesive is cured and the entire bonding surface of the single plates is bonded. As described in Patent Document 1, this bonding is performed by heating in a drying apparatus which is the next step.

As another method, the following bonding method has also been proposed.
As shown in FIG. 8 (a), for example, the ends of the single plate in the fiber direction are scarfed, the ends are bonded in advance with an adhesive, and the two bonded single plates are bonded to each other between the surfaces. The base material 101 is manufactured by bonding.
Next, on both the upper and lower surfaces of the base material 101, as shown in FIG. 8 (a), surfaces 103a and 105a (hereinafter referred to as scarf surfaces) in which the fiber direction is parallel to the base material 101 and the left end is scarfed. ), And the single plates 103 and 105 having an adhesive applied to the surface on the substrate 101 side are prepared.
Next, as shown in FIG. 8B, the single plates 103 and 105 are overlapped with the right edge aligned on both the upper and lower surfaces of the base material 101.

Next, as shown in FIG. 9A, the base material 101 has scarf surfaces 107a and 109a on both the upper and lower surfaces of the base material 101, the fiber direction being parallel to the base material 101, and the right end thereof being obliquely formed. Single plates 107 and 109 having an adhesive applied to the side surface and the scarf surface are prepared.
Next, as shown in FIG. 9B, the single plates 107 and 109 are respectively aligned on the upper and lower surfaces of the base material 101, the left side edges are aligned with the left side edge of the base material 101, and the scarf surfaces 107a and 109a are single. The plates 103 and 105 are overlapped with the scarf surfaces 103a and 105a.
Next, as shown in FIG. 10, the adhesive attached thereto is cured by heating and pressing between a pair of hot plates 111 and 113 with a predetermined pressure, and the bases of the single plates 103, 105, 107 and 109 are cured. Bonding to the material 101, bonding of the scarf surfaces of the single plate 103 and the single plate 107, and bonding of the scarf surfaces of the single plate 105 and the single plate 109 are performed simultaneously.
Japanese Patent No. 3824717

However, these methods have the following problems.
Usually, when bonding single plates with an adhesive, in order to obtain a sufficient adhesive force, it is necessary to heat the adhesive to a predetermined temperature and to press the single plates with a predetermined force. .
In this regard, in the former method, when the adhesive is cured by heating with a drying apparatus, the forces that are pressed against each other are hardly applied to the joint surface of the end of the single plate, and thus the obtained adhesive force is small.
Therefore, these bonded single plates could not be used for a single plate laminated material for construction, or a plate material such as plywood, except for a special case in consideration of the position of the bonding portion.
Of course, in the method of the patent document, by maintaining the pressure contact with the heating body, it is sufficient to cure not only the thin part of the joint surface or part of the thin part but also the entire adhesive of the joint part. However, in this case, it takes a long time to cure the entire adhesive, resulting in poor productivity.
Moreover, in the method described in Patent Document 1, the target veneer was a raw veneer containing a lot of moisture, but if this is a dried veneer, the time required for sufficiently curing the entire adhesive However, the productivity was not good as well.

On the other hand, in the latter method, the single plate 103, 105, 107, 109 is bonded to the base material and the scarf surfaces of the single plate are bonded at the same time, and sufficient bonding strength is obtained in both bondings. However, there were the following problems.
That is, as shown in FIGS. 8B and 9B, it is necessary to transfer the single plates 103, 105, 107, and 109 to predetermined positions of the base material 101 one by one and overlap them. Compared with the case where the single plates with the joined parts are transferred and overlapped, the time required is long, and the productivity is poor.

Usually, for example, in order to cure the phenol resin adhesive between two single plates to such an extent that the two single plates are not separated by a force that is received in the manufacturing process of the plate material (hereinafter referred to as primary curing) According to experiments, it has been confirmed that when both the single plates are pressed at a pressure of about 8 kilograms per square centimeter, the adhesive may be kept heated at about 100 ° C. for at least about 30 seconds.
In addition, in order to cure the same adhesive to the extent that it has sufficient adhesive strength as a product (hereinafter referred to as secondary curing), at the same pressure and temperature, it takes at least one minute to heat and clamp. It was confirmed that.
Furthermore, it was also confirmed that when the adhesive was heated at the same pressure, for example, at about 190 ° C., the adhesive would be in a secondary curing state in about 2 to 3 seconds.
Therefore, in the present invention, the ends of a plurality of single plates constituting each layer of the plate material are gathered together through an adhesive, and the center in the thickness direction of the single plate of the end surfaces to be bonded by heating in a short time. Only the part of the adhesive close to the surface of the veneer is secondarily cured and joined in a state where it is not separated by the force received in the subsequent plate manufacturing process (hereinafter referred to as temporary joining). When a veneer is laminated on a substrate with an adhesive and pressed with a heated body, the uncured adhesive between the end faces of the veneer is almost secondarily cured, and the temporarily bonded veneer and base The adhesive between the materials is at least secondarily cured.

The time for temporary joining of the single plates to be performed before being overlaid on the base material is short, and the time for making the temporary joint sufficiently strong, and for bonding the temporarily joined single plate and the base material Since time is taken at the same time, productivity is improved.
Furthermore, although it is a method of improving productivity, the strength of joining of single plates can be made sufficient.

  Hereinafter, the present invention will be described together with an example of an embodiment shown in the drawings.

In the partial front view, 1 and 3 are heating bodies heated to about 200 ° C. by being fixed to the heating parts 5 and 7 heated by an electric heater (not shown), respectively. is there.
As shown in FIG. 1, the heating body 1 has an inclined surface 9 a formed obliquely at the end of the single plate 9 so as to be pressed near the ends of the single plates 9 and 11 by an operation described later. Each of the protrusions 1a having a flat pressure surface with a predetermined length is formed at a position opposite to the vicinity of the one end 9b and the other end 9c, and a recess 1b is provided between the two protrusions 1a.
Similarly, the heating body 3 is also provided with two protrusions 3a having a flat pressure surface having a predetermined length and a recess 3b at a position opposite to both protrusions 1a.
The heating unit 5 is connected to an air cylinder (not shown) and is normally in the raised position shown in FIG. 1 and is controlled as follows by an operation signal from a controller (not shown).
That is, by operating the air cylinder, the single plates 9 and 11 are each 8 kg per square centimeter between the two protrusions 1a of the heating element 1 and the two protrusions 3a of the heating element 3 as described later. It is provided so as to be able to pressurize with a moderate force for 5 seconds, and when 5 seconds elapses, the air cylinder operates in reverse, and is controlled to move to the raised position and wait.
The heating unit 7 is fixed to a base (not shown).

Further, as a heating and pressing device for bonding a single plate to a plurality of layers, it is provided as shown in FIG.
In FIG. 3, the heating elements 17 and 19 are both heated to 190 ° C. by steam or the like.
The lower heating body 19 is fixed, and the upper heating body 17 is lowered and approached to the heating body 19 from the upper standby position (not shown) by the operation of a hydraulic cylinder (not shown). Moreover, it is provided so that it can be raised to the standby position from the pressed state.
The hydraulic cylinder is set to have a pressure of about 8 kilograms per square centimeter when the heating body 17 is lowered and the single plate is clamped with the heating body 19.
The time during which the heating body 17 continues to be clamped with the pressure by the lowering of the heating body 17 is set as will be described later, and when the set time elapses, the hydraulic cylinder is operated and the heating body 17 is raised to a standby position.

The heating and pressing apparatus in the embodiment is configured as described above, and the operation thereof will be described next.
First, as shown in FIG. 1, for example, an angle θ between the two ends of the two wood species to be joined, for example, 4 mm thick, in the fiber direction between the single plates 9 and 11 of cedar, as shown in FIG. In order to obtain an inclined surface 9a having an angle of about 7 degrees, the scar 10 is cut off obliquely with a circular saw to form the defect 10.
The single plate 11 is similarly processed so as to form the defect portion 12 so that the inclined surface 11a parallel to the inclined surface 9a is obtained.
The inclined surfaces 9a and 11a also appear as lines similar to those in FIG. 1 even in a cross section parallel to the fiber direction of the single plates 9 and 11, and these lines are virtual lines orthogonal to the front and back surfaces of the single plates 9 and 11. That is, it intersects with the virtual line XX in the vertical direction in FIG.

Next, about 0.016 grams per square centimeter is applied to one of these inclined surfaces 9a and 11a, for example, the entire surface of the inclined surface 9a.
Next, as shown in FIG. 1 with the heating unit 5 in the standby position, the single plates 9 and 11 are supported and arranged by a support member (not shown).
That is, one end 9b of the inclined surface 9a and the other end 11c of the inclined surface 11a are opposed to each other between the right protruding portion 1a and the protruding portion 3a so that the fiber direction of the single plates 9 and 11 is the left-right direction. On the other hand, it arrange | positions so that the other end 9c of the inclined surface 9a and the one end 11b of the inclined surface 11a may oppose between the left protrusion part 1a and the protrusion part 3a.

Next, in order to perform the first pressing process in this state, the air cylinder is operated and the heating unit 5 is lowered.
Therefore, as shown in FIG. 2, the single plate 9 and the single plate 11 contact one end 9b of the inclined surface 9a and the other end 11c of the inclined surface 11a, and the other end 9c of the inclined surface 9a and one end 11b of the inclined surface 11a. It will be in the state that hit.
As a result, at the end portions of the single plates 9 and 11, the portions left after the processing of the defect portions satisfy the defect portions.
In this state, the end portions of the single plates 9 and 11 are heated and pressed for 5 seconds by both the protruding portions 1a and the protruding portions 3a.

In this heat pressing, the thickness of the single plate 9 decreases as it approaches the one end 9b, and the distance between the protrusion 1a and the portion of the inclined surface 9a close to the upper surface of the single plate 9, that is, the thickness of the single plate. It is small.
For example, in FIG. 2, the thickness of the single plate at a location 5 mm to the left from the one end 9b is about 0.6 mm.
Therefore, the heat from the protrusion 1a pressed from above over the one end 9b reaches the inclined surface 9a on the one end 9b side through the thin portion of the single plate 9 in about 1 second, and near the one end 9b. The adhesive is heated at a temperature close to 200 ° C. and secondarily cured in about 2 to 3 seconds.
Similarly, heat from the protrusion 3a pressed from below across the one end 11b of the veneer 11 reaches the inclined surface 11a on the 11b side in a short time, and the adhesive near the one end 11b is secondarily cured. Let
As a result, the single plates 9 and 11 are temporarily joined at the end portions. Hereinafter, these single plates are referred to as temporary joint single plates, and this portion is referred to as a temporary joint portion T.
In the curing of these adhesives, the portions that directly contact the single plates 9 and 11 of the heating elements 1 and 3 are the protruding portions 1a and 3a, and the area of the direct contact is smaller than that in the case where there is no protruding portion and the entire surface is applied to the single plate. Small.
Therefore, even if the pressure of the air cylinder for lowering the heating unit 5 is lowered, the pressure acting between each projection 1a and the projection 3a can be increased.
Further, the vicinity of the one end 9b of the single plate 9 and the vicinity of the one end 11b of the single plate 11 can be intensively heated.
Further, even if the moisture inside the veneer 9 and the veneer 11 is vaporized by heat from the protrusions 1a and 3a, the vapor is easily discharged into the atmosphere from the recesses 1b and 3b. The curing of the agent is performed better.

By such curing of the adhesive, the single plate 9 and the single plate 11 are temporarily joined.
When the time for the heating and pressing is 5 seconds, the air cylinder is activated and the heating unit 5 rises to the standby position shown in FIG. 1 to stand by and stops the heating and pressing.
The above operations are repeated as many times as necessary to temporarily joint single plates having the same thickness as described above, and the temporarily joined single plates are cut to a predetermined length by a cutting device such as a saw to temporarily have a temporary joint T. A large number of bonded single plates V1, V2, V3, V4, V5, V6,.

In these temporary bonded single plates, for example, the adhesives of the inclined surfaces 9a and 11a other than the vicinity of the both end portions are slightly cured by the heat stored in the single plate after the heat pressing. It has not yet reached a sufficient bonding force.
However, the force received by the temporary bonded veneer being lifted or transferred in the subsequent process, that is, the process until the temporary bonded veneer is overlapped with an adhesive to produce a plate material as described later. Is extremely small compared to the force received when a plate manufactured using a temporary bonded single plate is used as a structural material, for example.
Therefore, in these temporarily joined single plates, the temporarily joined portion T is hardly separated by the force received in the process until the overlapping.
Further, in this embodiment, for example, in the case of both inclined surfaces 9a and 11a in FIG. 2, both inclined surfaces 9a and 11a are at one end 9b and the other end 11c and the vicinity thereof, and at the other end 9c and one end 11b. 2 and its vicinity are joined, so that both the inclined surfaces 9a and 11a are connected to one end compared to the case where only the vicinity of the center of both inclined surfaces 9a and 11a is joined in the left-right direction in FIG. It is difficult to separate even if it receives a force to peel off from the part.

Next, of these temporary bonded single plates, first, the two temporary bonded single plates V1 and V2 are bonded by the heating elements 17 and 19.
As shown in FIG. 3, the heating body 17 is bonded to the lower surface of the temporary bonding veneer V1 between the heating body 17 and the heating body 19 in a standby position sufficiently away from the heating body 19 upward. The agent is applied and placed on the temporarily bonded veneer V2 in a state where the fiber directions are overlapped with each other, for example, manually.
These single plates V1 and V2 can be moved and superposed, etc., because each temporary joint location T is temporarily joined as described above, and can be performed without any trouble.

Next, in order to perform the second pressing step, the heating body 17 is lowered, and the superimposed temporary bonding single plates V1 and V2 are heated and pressed with the heating body 19 at the pressure for 2 minutes.
In this heating and pressing, the heat from the heating members 17 and 19 is bonded to the single plates V1 and V2 through the single plates V1 and V2 from the outer surfaces of the two pressed single plates V1 and V2, respectively. Will be transmitted to the drug.
Therefore, this heat first reaches each temporary joint location T, and the adhesive that has not been cured at each temporary joint location T is also cured. At this time, the pressure is almost the same even at the temporary joint location T as described above. Therefore, the temporary joint portion T is joined with sufficient strength.
Further, by the pressing for 2 minutes, the heat also cures the adhesive between the single plates V1 and V2 to be in a second-cured state, which will be described later, and the single plates V1 and V2 are integrated with sufficient strength. The plate material is W1.
In addition, after the elapse of 2 minutes, the heat transmitted from the heating bodies 17 and 19 is accumulated in the single plates V1 and V2 and becomes high temperature.
After the elapse of 2 minutes, the heating body 17 is raised and stopped at the standby position.

Subsequently, the temporary joining single plates V3 and V4, in which the adhesive is applied to the surface on the first plate member W1 side, in the state where the first plate member W1 is supported by the manual operation between the heating bodies 17 and 19, are used as the first plate member. W1 and fiber direction are made the same, and it superimposes on the 1st board | plate material W1, and then the heating body 17 is lowered | hung and it clamps for 50 second by the same pressure as the above as shown in FIG.
In this heating and pressing, the adhesive applied to the single plates V3 and V4 immediately receives heat from the single plates V1 and V2 having the high temperature heat, and is cured when the temperature reaches about 100 ° C. Begin to.
Further, the heat from the single plates V1 and V2 is also transmitted to the temporary joint locations T of the single plates V3 and V4, and the adhesive is cured at the locations T.
On the other hand, the heat transferred from the outer surfaces of the single plates V3 and V4 by the heating bodies 17 and 19 is also first applied to the single plates V3 and V4 as in the case where the first plate material W1 is manufactured by heating and pressing as shown in FIG. Each temporary joining point T is reached, and the adhesive that has not been cured at each temporary joining point T is cured.
The heat is also transferred to the adhesive applied to the single plates V3 and V4 through the single plates V3 and V4, and the curing of the adhesive proceeds in sequence to be integrated into the second plate material W2.
Further, the heat is transferred to the adhesive between the single plates V1 and V2 through the single plates V1 and V2, and the curing of the adhesive is further promoted.
Next, after 50 seconds have elapsed, the heating element 17 is raised and waited.

Subsequently, as shown in FIG. 5, the single plates V5 and V6 having the adhesive applied to the surface on the second plate material W2 side are overlapped with the second plate material W2 with the same fiber direction as the second plate material W2, and similarly 50 The second plate material W3 is bonded by heating and pressing for 2 seconds, and thereafter, the same operation is repeated a predetermined number of times to sequentially bond the temporary bonded single plates.
However, when the two temporary bonded single plates are bonded to the upper and lower surfaces of the plate material W (n-1) obtained by pasting so as to be the last plate material Wn, the time for the heat-pressing is set. 2 minutes.

In the present embodiment, the plate material Wn is manufactured by the method as described above.
That is, first, the end portions of the single plates are temporarily bonded so as not to separate in a short time, and the obtained temporary bonded single plates V1, V2, V3, V4, V5, V6,. Using the tightening time, the adhesive at the temporary joining point T is sufficiently cured and joined.
Therefore, the plate material Wn can be manufactured with high productivity.

The plate material Wn is manufactured as described above. The reason why the heating and pressing time in these methods is changed to 2 minutes or 50 seconds as described above will be described next.
As shown in FIG. 3, the case where the single plates V1 and V2 are first heated and pressed by the heating bodies 17 and 19 will be described.
In this case, the heat for curing the adhesive between the single plates V1 and V2 is only the heat transferred from the heating bodies 17 and 19 through the single plates V1 and V2.

Until the heat acting on the adhesive reaches about 100 ° C., there is a difference depending on the type of tree of the veneer. For example, in the case of a veneer having the above thickness, the temperature of the heating bodies 17 and 19 is It takes about 50 seconds to 1 minute.
Therefore, in order to secondarily cure the adhesive between the veneers V1 and V2, the time for applying heat of about 100 ° C. in the pressed state is at least about 1 minute as described above. It is heated and pressed for a minute.

Next, for example, in the case where the single plates V3 and V4 are heated and pressed to the first plate W1 by the heating members 17 and 19 to form the second plate W2, the reason for setting the heating and pressing time to 50 seconds will be described.
Heat is accumulated in the first plate W1 to which the single plates V3 and V4 are heated and pressed by heating for 2 minutes by the heating bodies 17 and 19 described in FIG.
Therefore, as shown in FIG. 4, when the single plates V3 and V4 are heated and pressed on the upper and lower surfaces of the first plate material W1 by the heating bodies 17 and 19, respectively, the adhesive applied to the single plates V3 and V4. The agent immediately receives the heat from the first plate W1, and in the experiment, it becomes 100 ° C. or higher in about 20 seconds and begins to harden.
Therefore, in order to primarily cure the adhesive applied to the single plates V3 and V4, the heating and pressing time is set to 50 seconds.

Of course, in this 50 seconds, the adhesive applied to the single plates V3 and V4 is in a primary curing state, but then receives heat as follows and becomes substantially in a secondary curing state.
That is, the heat of the first plate material W1 gradually decreases as it is consumed for the primary curing, but the veneers V3, V4 are heated and pressed by the heating bodies 17, 19 for the 50 seconds. Also heat is accumulated.
As a result, after the 50 seconds have elapsed, the heat accumulated in the single plates V3 and V4 is applied, and the adhesive applied to the single plates V3 and V4 proceeds.
However, immediately after the elapse of 50 seconds, since the heating elements 17 and 19 are separated from the single plates V3 and V4, the force for pressing the single plates V3 and V4 to the first plate material W1 acts. This is not a preferable state for good adhesion.

However, as shown in FIG. 5, when the single plates V5 and V6 are heated and pressed to the second plate W2 by the heating members 17 and 19, the single plates V3 and V4 are naturally pressed to the first plate W1. The force to act will also act.
As a result, after the single plates V5 and V6 are heat-pressed to the second plate W2, the adhesive applied to the single plates V3 and V4 is heated to approximately 100 ° C. due to the necessary pressure. It will be cured in a wet state.
The curing time of the adhesive in this state is 1 minute or more in total except for the time when the pressing force is not applied in the middle, so that the adhesive is substantially in a secondary curing state. Become.
In the following, since the heat acts on the adhesive in the same manner also in the case of heating and pressing before the second plate material W2, the third plate material W3 and the last plate material Wn, the heating and pressing time is set to 50 seconds. There is no problem.

Next, when the last plate material Wn is used, the reason why the heating and pressing time by the heating bodies 17 and 19 is 2 minutes will be described.
In this case, the last single plate Vy, Vz is heated and pressed to the W (n-1) plate material, and the adhesive applied to the W (n-1) plate material side of the single plate Vy, Vz is cured. Of course, the heating and pressing time for bonding the single plates Vy and Vz to the W (n-1) th plate material is only this time.
Therefore, in order to bring the adhesive into a secondary curing state, the heating and pressing time is set to 2 minutes.

Next, a modified example will be described.
1. In a cross section parallel to the fiber direction, between the end portions of two single plates to be joined, in a cross section parallel to the fiber direction, a portion where an edge line of the end portion intersects a virtual line orthogonal to the front and back surfaces of the single plate The defect portion having at least one side from the center position in the orthogonal direction of the single plate, the defect portion having such a shape as to meet the defect portion when the end portions are brought together. Alternatively, it may be formed as follows.
That is, when the two single plates 21 and 23 having the defect portion are brought together, (a), (b), (c), (d) and (d) of FIG. 6 shown in the positional relationship corresponding to FIG. It may be a defective part as shown in (e).
Moreover, the defect | deletion part like (a) of FIG. 7, (b), and (c) may be sufficient.
6 and 7, the alternate long and short dash line is an imaginary line passing through the center position of the single plate in the orthogonal direction.

A veneer having a chipped portion at the end in the fiber direction is heated and pressed in the same manner as described with reference to FIG. By doing so, the adhesive is cured at a portion surrounded by a circle in FIGS. 6 and 7, and the single plates become temporary bonded single plates.
In addition, in the defect | deletion part of (b) and (c) of FIG. 7, although the location which an adhesive hardens becomes only one side above the said dashed-dotted line of a single plate, it acts in the board | plate material manufacturing process after that similarly. There is no problem with the force of the degree without separation.
Of course, even in a defective portion other than the defective portions shown in FIGS. 7B and 7C, only one side of the heating elements 1 and 3 is heated in the heating and pressing shown in FIG. By pressing at normal temperature, the part where the adhesive is cured may be only on one side of the one-dot chain line of the single plate.

2. The chipped portion formed at the end of the single plate in the fiber direction may be formed by removing with a cutter or the like in addition to the circular saw, or formed by compressing and plastically deforming with a heated pressure member. You may do it.
3. In the embodiment, the time for temporary joining and the time for heating and pressing by the heating body in the first pressing process and the second pressing process were set as described above, but these times are the temperature of the heating body, What is necessary is just to change suitably according to the tree species of a single board, the thickness of a single board, the kind of adhesive agent to be used, etc.
4). In the second pressing step in the embodiment, after pressing the thermosetting adhesive for the first time until the temporary bonding veneer and the base material are not separated, the next temporary bonding veneer The first-cured adhesive was secondarily cured by heat-pressing to bond the first to second.
However, as described above, the adhesive may be left without being heated at all after first curing. In this case, although it takes time, the adhesive is gradually cured and is almost in a secondary cured state.
5. As described with reference to FIG. 2, two single plates were temporarily joined by pressing with the heating elements 1 and 3 having the recess 1b or the recess 3b, but some trees have relatively good air permeability. Yes, in such a case, the steam generated inside the veneer during heating and pressing is easily discharged into the atmosphere. Therefore, the heating elements 1 and 3 are similarly implemented without providing the recess 1b or the recess 3b. You may do it.

6). In the above embodiment, as shown in FIGS. 3, 4 and 5, two temporary bonded single plates are sequentially bonded by the heating elements 17 and 19, but the single plate having a small thickness or relatively heat transfer. In the case of a single plate that is easily processed, a total of four temporary bonded single plates, for example, two from the top and two from the bottom may be bonded at a time.
7). In the said Example, as shown in FIGS. 4 and 5, the time required to bond the temporary bonded single plates by heating and pressing them one by one sequentially with the heating bodies 17 and 19 does not separate the single plates. The adhesive was primarily cured for a short period of time, and then the temporarily cured adhesive was secondarily cured by further heat-pressing the temporary bonding veneer.
However, in each heating and pressing, time is wasted, but the heating and pressing time may be lengthened so that the adhesive is secondarily cured by one heating and pressing.
8). In the above embodiment, as shown in FIGS. 4 and 5, a single plate temporarily bonded to all layers constituting the plate material was used. For example, in consideration of aesthetics, the outermost layer was not bonded to the fiber direction. A single plate that is continuous may be used.

It is a partial front explanatory view of an example. It is operation | movement explanatory drawing of an Example. It is operation | movement explanatory drawing of an Example. It is operation | movement explanatory drawing of an Example. It is operation | movement explanatory drawing of an Example. It is explanatory drawing of the example of a change of the defect | deletion part formed in the fiber direction edge part of a single plate. It is explanatory drawing of the example of a change of the defect | deletion part formed in the fiber direction edge part of a single plate. It is operation | movement explanatory drawing of a prior art. It is operation | movement explanatory drawing of a prior art. It is operation | movement explanatory drawing of a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Heating body 1a ... Projection part 3 ... Heating body 3a ... Projection part 10 ... Defect part 12 ... Defect part 13 ... Single board 15 ... Single board 17 ..Heating body 19 ... Heating body T ... Temporary joining locations V1, V2, V3, V4, V5, V6 ... Temporary joining single plate W1 ... First plate material W2 ... Second plate material

Claims (3)

In the cross-section parallel to the fiber direction between the fiber direction ends of the two dried veneers to be joined, a position where the edge line of the end intersects a virtual line orthogonal to the front and back surfaces of the veneer, The defect having at least one side from the center position in the orthogonal direction of the veneer, the defect having a shape that satisfies the defect when the ends are brought together in the fiber direction Deficient part forming step of forming a part,
An adhesive application step of applying a thermosetting adhesive to at least one of the surfaces of the deficient parts formed on the two dry veneers,
Bringing the two dry veneers together in the fiber direction so as to satisfy each other's defect portion;
When pressing the both end parts brought together from both the front and back sides of the single plate with a pair of pressing bodies, at least a pressing body on the side close to the position where the edge line of the end portion intersects the virtual line In the heated state, a part of the applied adhesive is cured, so that the two single plates are integrated, but in the other part, the first pressure is pressed for such a time that the adhesive is not cured. Tightening process,
A bonded veneer manufacturing process for manufacturing a bonded veneer in which a plurality of dry veneers are integrated by repeating these steps as appropriate,
The bonded veneer is heated to the base material via a thermosetting adhesive, and at least to the extent that the bonded veneer and the base material are not separated by a heating element arranged to cover the entire bonded veneer. Time for the thermosetting adhesive to cure, a second pressing step for pressing,
The manufacturing method of the board | plate material which consists of.   The manufacturing method of the board | plate material of Claim 1 which is an adhesive agent coating process of apply | coating a thermosetting adhesive to the whole surface of the at least one surface of the surface where the defect | deletion part formed in the said 2 dry veneer faces each other.   3. The plate material according to claim 1, wherein the plate material is a defective portion forming step of forming surfaces that are inclined with respect to the front and back surfaces of the single plate and parallel to each other between the ends in the fiber direction of the two dried single plates to be joined. Manufacturing method.

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