JP2742887B2 - Method for producing wood laminate by two-component separation coating and production apparatus used therefor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a wood laminate by two-component separation coating and a production apparatus used therefor, and more particularly to a two-component adhesive for wood comprising a main component and a hardener component. Separately and separately applied to the same wood material, and after the separate application, a plurality of pieces of the wood material are laminated and pressed to form an adhesive layer by mixing the main component and the hardener component based on the laminated pressure and adhere. The present invention relates to a method for improving a method for producing a wooden laminate by two-component fractional coating, and a production apparatus suitable for producing the wooden laminate.

[0002]

2. Description of the Related Art Conventionally, when a laminated material is formed by using a two-component adhesive, as a method of applying the adhesive, a main component component and a curing agent component are mixed in advance, and the size liquid is mixed. There is a method of applying to the wood material (lamina) that constitutes the glued laminated wood (size liquid application method). However, in this method, a prior gluing operation is required, and the operation must be performed in a short time. There are drawbacks such as that the main component and the hardener component are apt to cause loss, that the remaining adhesive must be cleaned at the end of the operation, and that it takes a lot of time to complete the operation.

In order to improve this method, a main component and a curing agent component are separately supplied from a storage container, and these components are discharged in a ramen form, and lamina is passed directly under the ramen so as to be continuously separated and applied. In this case, there is proposed a coating method by two-component separation coating in which the adhesive is applied while collecting each component that has come out from the width of the lamina (Japanese Patent Publication No. 4-79709). According to this method, there is an advantage that there is no need for a gluing operation, there is no loss between the main component and the curing agent component, no cleaning operation is required at the end of the operation, the operation is simple, and the operation is easy to handle. . In this separate application method, the main component and the hardener component are mixed during laminating and pressing, and during the curing,
The main component and the hardener component are compatible with each other to form a uniform adhesive layer.

[0004] However, in the separate coating method, although having the above-mentioned advantages, it has a drawback of lacking in the stability of the adhesive force, and the adhesive layer of the large section laminated material for structural use, particularly, manufactured by the separate coating method. Ooze (elution) of adhesives and hardeners occurred during construction of buildings with the structural materials, and improvements from various aspects have been made, but all of them were insufficiently completed. I have. That is, from the viewpoint of the adhesive,
It has been proposed to improve the compatibility with the curing agent, but it has not been the decisive factor for the improvement as before. Also, from the viewpoint of equipment, that is, equipment improvement such as increasing the number density of nozzles for discharging the adhesive in order to ensure that both components of the adhesive are sufficiently mixed during pressing. Has been proposed, but again, it has not been the decisive factor for its improvement. In particular, the problem is when the bonding conditions become unstable, for example, when the lamina has uneven thickness, when the pressing pressure is insufficient, etc. This leads to a situation in which the adhesive performance is remarkably inferior to that of the size liquid coating method for mixing.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a technique capable of overcoming the disadvantages of the prior art. The present invention provides a technique capable of improving the bonding performance even when the bonding conditions become unstable, such as when the lamina has thickness unevenness as described above or when the pressing pressure is insufficient. It is intended to do so. The above and other objects and novel features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

[0006]

SUMMARY OF THE INVENTION The present invention provides a technique for improving the bonding performance even when the bonding conditions become unstable, such as when the thickness of the lamina is uneven, or when the pressing pressure is insufficient. As a result of intensive studies with the aim of providing an adhesive, after the application process, before forming an adhesive layer by mixing the main component component and the curing agent component by lamination pressing, by performing pre-mixing on lamina, the adhesive And the above-mentioned problems that could not be achieved by conventional equipment improvements were successfully solved. That is, the present invention for achieving the above object comprises the following means as described in the claims. (Claim 1) The main component and the hardener component constituting the two-pack type wood adhesive are separately applied to the same wood material separately, and the main component applied to the same wood material after the separate application. And the hardener component are preliminarily mixed on the wood material, and then the main component component and the hardener component are separately applied, and a plurality of the premixed wood materials are laminated and pressed to form the lamination pressure. A method for producing a wooden laminate by two-component separation coating, wherein an adhesive layer composed of the main component and the curing agent component is formed by pressure-mixing based on tightening and bonding is performed. (Claim 2) The method according to claim 1, wherein the premixing is performed by blowing air. (Claim 3) an apparatus for producing a wood laminate for use in the production method of the wood stack by two liquid separating coating of claim 1, coating recovery mechanism of the main agent component and the curing agent component of the coating recovery mechanism And a mixing and stirring mechanism by air blowing, wherein the mixing and stirring mechanism by air blowing has an air supply unit and an air discharge unit having a nozzle capable of discharging air. Equipment for manufacturing wood laminates for application. (Claim 4) The air discharging portion is composed of a nozzle and an air cylinder, and the air cylinder is 30 to 30 with respect to the traveling direction of the wooden material.
The two-part liquid according to claim 3, wherein the nozzle is disposed at an angle of 60 °, and the nozzle installed in the air cylinder is oriented at an angle of 40 to 70 ° with respect to the application surface of the wood material. Equipment for manufacturing wood laminates for separate application. (Claim 5) The discharge port diameter of the nozzle is 0.2 to 2 mm.
5. The apparatus for producing a wood laminate for two-component separation coating according to claim 3, wherein the number of the nozzles is 5 or more per 10 cm of the effective coating width.

[0007]

According to the above-mentioned means of the present invention, by premixing on a wooden material, the main component and the hardener component can be sufficiently mixed during laminating and pressing. The compatibilization of the main component and the curing agent during curing will also be performed sufficiently, and as a result, when lamina has uneven thickness or when the pressing pressure is insufficient, the bonding conditions will be unstable. In such a case, a uniform adhesive layer can be formed and excellent adhesive performance can be exhibited.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for producing a wooden laminate by two-component separation coating according to the present invention and a production apparatus used therein will be described below with reference to the drawings. FIG. 1 is a main part configuration diagram of a manufacturing apparatus showing an embodiment of the present invention. As shown in FIG. 1, the manufacturing apparatus 1 includes a main component component application and recovery mechanism A having a main component tube 3 for applying a main component component 2 constituting a two-pack type wood adhesive, and a curing agent component 4. And a hardening agent application / collection mechanism B having a hardening agent tube 5 for applying the air, and a blowing / mixing / stirring mechanism 7 for blowing air 6. The main agent component 2 is supplied to each of the main agent tube 3 constituting the application and recovery mechanism A of the main agent component, the curing agent tube 5 constituting the application and collection mechanism B of the curing agent component, and the mixing and stirring mechanism 7 for blowing air 6. Supply pipe 8, supply pipe 9 for supplying hardener component 4
And a supply pipe 10 for supplying air 6. The main agent component 2 is supplied to the main agent tube 3 via a supply pipe 8, and the curing agent component 4 is supplied to the curing agent tube 5 by a supply pipe 9.
Supplied via The components 2 and 4 are individually discharged in the form of a ramen onto the application surface of the wooden material 11 that has been moved and supplied from one direction from the main agent tube 3 and the hardening agent tube 5, and the wooden material that passes immediately below the components. The material 11 is continuously and separately applied. FIG. 2A is an explanatory view of a main part of a manufacturing apparatus showing a similar embodiment of the present invention viewed from the side. FIG.
As shown in (A), the inside of the storage container 12 for the main component 2
By a pump 13 housed in, through the supply pipe 8,
The main agent component 2 is supplied to the main agent tube 3, and the main agent component 2 is discharged from the main agent tube 3 in the form of a ramen as described above, and is applied to the wooden material 11.
Is collected in the container 12. Similarly, as shown in FIG.
The hardening agent component 4 is supplied to the hardening agent tube 5 through the supply pipe 9 by the pump 15 housed inside the storage container 14 of the hardening agent component 4, and the ramen-shaped portion is formed from the hardening agent tube 5 as described above. The hardener component 4 is discharged down to the wooden material 11
In this case, the hardener component 4 that is outside the width of the wooden material 11 and comes out of the container 1
Collect in 4.

Conventionally, the main component 2 and the hardener component 4 were separately applied as described above, and then laminated and pressed to form a laminated body. Air 6 is blown onto the main component 2 and the hardener component 4 that have passed through the application step to perform mixing and stirring. The mixing and stirring
The mechanism 7 includes an air supply unit 16, a supply pipe 10 that supplies the air 6, and an air discharge unit 17. The air supply unit 16 has a compressor, and the electromagnetic valve 1
8 and a regulator 19 are added to control the air amount and air pressure. Air discharge unit 17
Is provided with a nozzle 20 and an air cylinder 21. As shown in the drawing, the main agent component 2 and the hardener 4 are individually discharged from the main agent tube 3 and the hardener agent tube 5 in the form of a ramen on the application surface of the wooden material 11 that has been moved and supplied from one direction. An air comprising a nozzle 20 and an air cylinder 21 while controlling the amount of air and the air pressure with the solenoid valve 18 and the regulator 19 from the compressor 16 to the wood material 11 that has been subjected to the continuous separation application. Air is supplied to the discharge unit 17, and air is blown from the nozzle 20 to the main component 2 and the hardener 4 to mix and agitate the main component 2 and the hardener 4, thereby performing preliminary mixing on the wood 11. Do. However, even if the mixing and stirring means 7 is provided and air 6 is sprayed on the main component 2 and the curing agent component 4 after the application to perform the mixing and stirring, the mixing of the adhesive layer is forcibly performed by the pressure of the air. Even if the stirring is performed, it is a problem whether or not a stable adhesive layer can be formed. In this case, at the time of the preliminary mixing, as shown in FIG. 2B, the air cylinder 21 is arranged at an angle (X) of 30 to 60 °, particularly 45 ° with respect to the traveling direction of the wooden material 11. Is preferred. Thereby, the mixing and stirring by spraying the air 6 with the main component 2 and the curing agent component 4 after the application can be performed more favorably, and when the angle (X) is less than 30 °, it is difficult to perform good mixing and stirring. In addition, even if it exceeds 60 °, it is difficult to achieve good mixing and stirring. Further, as shown in FIG. 2A, it is preferable that the nozzle 20 is disposed at an angle (Y) of 40 to 70 °, particularly 60 ° with respect to the application surface of the wooden material 11. Thereby, the mixing and stirring by spraying the air 6 with the main component 2 and the curing agent component 4 after the application can be performed more favorably, and when the angle (Y) is less than 40 °, it is difficult to achieve good mixing and stirring. In addition, even if it exceeds 70 °, it is difficult to achieve good mixing and stirring. The mixing and agitation can be performed satisfactorily and satisfactorily by performing the mixing with the arrangement angle of the air cylinder 21. Further, the discharge port diameter of the nozzle 20 is 0.2 to 2 mm.
Is preferably within the range. If the discharge opening diameter of the nozzle 20 is less than 0.2 mm, the area where the air 6 comes into contact with the main component 2 and the hardener component 4 is reduced, and it is difficult to perform effective mixing and stirring. However, the rate at which the adhesive comes out from the width of the wooden material 11 increases. For the same reason, the it is preferred that the pressure of air 6 to be discharged from the nozzle 20 indicated by the regulator 19 is made to be 2 to 10 kg / cm ^2, less than the pressure of 2 kg / cm ^2,
The blowing pressure at which the air 6 comes into contact with the main component 2 and the curing agent component 4 becomes small, and it is difficult to perform effective mixing and stirring.
On the other hand, when it exceeds 10 kg / cm ² , the rate at which the adhesive comes out from the width of the wood 11 increases, even if it is good for mixing and stirring. In the present invention, it is preferable that five or more nozzles 20 are provided per 10 cm of the effective coating width. If the number is less than 5 per 10 cm of the effective coating width, the adhesive components may not be sufficiently mixed and stirred,
It is difficult to achieve the technology of improving the bonding performance even when the bonding conditions become unstable, such as when the thickness of the wooden material is an object of the present invention and when the pressing pressure is insufficient or the like. .

Wood materials used in the present invention include small square wood, lamina, plywood and the like. In addition, examples of the main component used in the present invention include a resorcinol adhesive. Further, the curing agent component used in the present invention includes formaldehyde and the like.

Hereinafter, the present invention will be described in more detail with reference to the following examples. Embodiment 1 FIG. Separate coating and recovery mechanism and mixing and stirring as shown in Fig. 1 and Fig. 2
An apparatus for manufacturing a wood laminate having a mechanism was assembled. The air cylinder was provided with 18 nozzles having a diameter of 1 mm per 10 cm of the effective coating width. The air cylinder was arranged at an angle of 45 ° with respect to the laminating direction, and the nozzle installed in the air cylinder was angled at 60 ° with respect to the lamina application surface . The ejection ratio of the main agent component and the curing agent component is set to be 100 to 50, and the laminating speed is 50 m / min.
The coating amount was adjusted to 350 g / ^{m 2.} The pressure of the compressor was adjusted to 5 kg / cm ² , the main component and the hardener component were applied, and five 30 mm-thick Yonematsu laminas passed under the air cylinder were superimposed on each other.
Thickness unevenness was intentionally generated by sandwiching a 5 mm spacer, and bonding was performed at 20 ° C. under a pressure of 10 kg / cm ² for 18 hours. The bonded glulam had an adhesive property that sufficiently satisfies the JAS standard for structural large-section glulam. Table 1 shows the results.

Comparative Example 1 In a production apparatus for a sperm body having only a separate coating and collecting mechanism without a mixing and stirring mechanism , in the same manner as in Example 1, the main component component and the curing agent component were discharged at a ratio of 100 to 50, and the laminating speed was increased. After applying the main agent component and the curing agent component to 30 mm-thick Yonematsu lamina at 50 m / min and an application amount of 350 g / m ² , five such laminas are overlapped, and 0.5 mm is applied to both ends of each adhesive layer. , A thickness unevenness is intentionally generated, and a pressure of 1 kg / cm ^{2 at} 20 ° C.
Bonding was performed under the pressing condition of 8 hours. However, the main component and the curing agent component of the adhesive layer did not spread, mixing was insufficient, and an adhesive force that passed the JAS standard of a large-sized laminated structural material was not obtained. Table 1 shows the results.

[0013]

[Table 1]

Although the invention made by the inventor has been specifically described based on the embodiments, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the gist of the invention. Needless to say, For example,
In the above-described embodiment, the example in which the pre-mixing is performed by blowing air is shown. However, another gas may be used instead of air, or a means such as mixing and stirring using a roller may be used.

[0015]

The effects obtained by the representative ones of the inventions disclosed in the present application will be briefly described as follows. That is, according to the present invention, the main component and the hardener component are sufficiently mixed during the lamination pressing, and the compatibilization between the main component and the hardener component during the pressing curing is also achieved. Will be done enough,
Even when lamination has uneven thickness or when the bonding conditions become unstable, such as when the pressing pressure is insufficient, a uniform adhesive layer can be formed and excellent adhesive performance can be exhibited. The present invention can be applied to general lamination techniques of various laminates in addition to the above-mentioned wood materials.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a main part of a manufacturing apparatus showing an embodiment of the present invention.

FIG. 2A is an explanatory view of a main part of a manufacturing apparatus showing a similar embodiment of the present invention viewed from a side, and FIG. 2B is an explanatory view of a positional relationship between an air cylinder and a wooden material.

[Description of Signs] 1 ... Laminate Manufacturing Apparatus 2 ... Main Agent Component 3 ... Main Agent Tube 4 ... Hardener Component 5 ... Hardener Tube 6 ... Air 7 ... Air 6 Blow Mixing and Agitating Mechanism 8 ... Supply Pipe 9 ... Supply Pipe 10 ... supply pipe 11 ... wood material 12 ... storage container 13 ... pump 14 ... storage container 15 ... pump 16 ... air supply unit 17 ... air discharge unit 18 ... solenoid valve 19 ... regulator 20 ... nozzle 21 ... air cylinder A ... Coating and collecting mechanism B: Coating and collecting mechanism for curing agent component X: Angle Y: Angle

Continued on the front page (51) Int.Cl. ⁶ Identification code FI B32B 21/13 B32B 21/13

Claims (5)

(57) [Claims] A main component and a hardener component constituting a two-pack type wood adhesive are separately applied to the same wood material, respectively, and the main agent component is applied to the same wood material after the separate application. And the hardener component are preliminarily mixed on the wood material, and then the main component component and the hardener component are separately applied, and a plurality of the premixed wood materials are laminated and pressed to form the lamination pressure. A method for producing a wooden laminate by two-component separation coating, wherein an adhesive layer composed of the main component and the curing agent component is formed by pressure-mixing based on tightening and bonding is performed. 2. The method according to claim 1, wherein the preliminary mixing is performed by blowing air. 3. A manufacturing apparatus of a wood laminate for use in the production method of the wood stack by two liquid separation coating according to claim 1, the main agent component of the coating recovery mechanism and the curing agent component of the coating recovery mechanism And a mixing and stirring mechanism by air blowing, wherein the mixing and stirring mechanism by air blowing has an air supply unit and an air discharge unit having a nozzle capable of discharging air. Equipment for manufacturing wood laminates for application. 4. An air discharge section comprising a nozzle and an air cylinder, wherein the air cylinder has a width of 30 to 30 with respect to the traveling direction of the wooden material.
The two-part liquid according to claim 3, wherein the nozzle is disposed at an angle of 60 °, and the nozzle installed in the air cylinder is oriented at an angle of 40 to 70 ° with respect to the application surface of the wood material. Equipment for manufacturing wood laminates for separate application. 5. The discharge port diameter of a nozzle is 0.2 to 2 mm.
5. The apparatus for producing a wood laminate for two-component separation coating according to claim 3, wherein the number of the nozzles is 5 or more per 10 cm of the effective coating width.