JP3366981B2 - Manufacturing method of wood laminate - 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 manufacturing a wood laminated material, and in particular, after applying an adhesive to a veneer and laminating the veneer, the veneer is inserted into a steam injection type press to apply steam from the side surface of the veneer laminate. The present invention relates to a suitable hot-pressing technique in a method for manufacturing a wood laminated material, which is introduced into an adhesive layer to raise the internal temperature, and then pressure-bonded by upper and lower hot plates to bond and integrate them.

[0002]

2. Description of the Related Art Conventionally, a single plate is coated with an adhesive, a plurality of the single plates are laminated, temporarily pressed and then inserted into the upper and lower hot plates of a hot press or a continuous press, and heated and pressed. There is a manufacturing method in which adhesion and integration are performed. However, this method has a drawback in that the heating and pressing process requires a long time and the productivity is low, which is particularly remarkable in the production of thick products. That is, in a normal hot press or continuous press, since heating is performed from the upper and lower heating plates, heat is transferred from the front and back of the laminated plate to the inside, and the temperature rise for curing the adhesive from the front and back of the laminated plate to the inside. As a result, as the number of laminated veneers increases, it takes more time to transfer heat to the deepest adhesive layer of the laminated plate, and the laminated plate is pressed between the press heating plates until the entire adhesive layer is cured. It is inefficient because it has to be kept in a pressed state for a long time. Even if the temperature of the press heating platen is increased to accelerate the curing time, the temperature rising rate to the adhesive layer inside the laminated plate is not significantly improved, but rather discoloration or puncture of the veneer occurs, which causes a problem.

The productivity can be improved in the case of using small pieces of wood or wood fiber mat as a raw material by utilizing the thermocompression technique of introducing high-pressure steam from the side at the time of compaction. Laminated Veneee
When the adhesive layer is in close contact with the adhesive layer (e.g. r Lumber), uniform heating of the adhesive layer is very difficult because it is difficult to evenly disperse the vapor. There is a problem in accelerating the curing of the adhesive.

[0004]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned drawbacks of the prior art, improves the thermocompression technology of introducing high-pressure steam from the side, and aims to increase the temperature uniformly in all adhesive layers. It is possible to cure the adhesive layer evenly,
Adhesive curing time can be shortened. Therefore, the pressing time for adhesive curing at the time of manufacturing wood laminated materials can be significantly shortened, and moreover, in addition to the conventional batch type, continuous production is also efficient. The purpose is to provide a simple press system.

[0005]

According to the present invention, after depositing a plurality of veneers each having a protruding adhesive layer formed orthogonal to the fiber direction of the veneer, the veneer laminate is placed in a steam jet press. And the steam is introduced into the adhesive layer from the side surface of the veneer laminate to raise the internal temperature, and then the veneer laminate is pressure-bonded by the upper and lower heating plates to be bonded and integrated. The present invention relates to a method for producing a wood laminated material.

Next, the method for producing a wood laminated material according to the present invention will be described in detail by taking a continuous press as an example. Explaining an example of a side surface steam injection type continuous press used in the present invention and a side surface steam injection type continuous pressing method therefor,
As shown in FIG. 1, the press 1 includes an insertion conveyor 2, an upper idle roll 3, an upper tension roll 4, a lower idle roll 5, a lower tension roll 6, and a belt 7.
And a steam injection plate 8, upper and lower heating plates (heating plates) 9 and 10, and a belt sandwiching press 11, and a single plate laminated body 12 provided from the insertion conveyor 2 is provided with an upper idle roll 3 and an upper tension. When the single-plate laminate 12 passes through the steam injection plate 8 while being continuously transported by the belts 7, 7 that are respectively hung between the roll 4 and the lower idle roll 5 and the lower tension roll 6. Then, high-pressure saturated or overheated steam is injected from the many steam injection holes of the steam injection plate 8 to the side surface of the single plate laminate 12 to raise the temperature inside the single plate laminate 12, and then the hot plate 9 concerned. The veneer laminate 12 is heat-pressed by 10 and the adhesive inside the veneer laminate 12 is cured and integrated to form a wood laminate material. Figure 2
The figure shows a state in which high-pressure steam is injected from the multiple steam injection holes of the steam injection plate 8 to the side surface of the single-plate laminate 12, and the steam is turned on (open) and off (closed) by turning the cock 13 on the steam injection plate 8. High-pressure saturated or overheated steam 14 is injected onto the side surface of the single-plate laminate 12 on the belt 7 while adjusting the injection to be suitable.

As shown in FIG. 3A, the adhesive 17 is applied so as to be orthogonal to the fiber direction 16 of the single plate 15. Figure 3
As shown in (B), the adhesive 17 has a semicircular cross section and
A single plate 1 which is applied linearly and has a semicircular adhesive layer 17
A plurality of 5 are deposited. The single plate laminate 12 is inserted into the side surface steam jet type continuous press 1, and steam 14 is added as described above.
After injecting steam into the adhesive layer 17 from the side surface of the veneer laminate 12 by injecting to the side surface orthogonal to the laminating surface of the veneer stack 12 to raise the internal temperature of the veneer laminate 12. ,
The upper and lower hot plates 9 and 10 heat-compress the single-plate laminate 12, and the adhesive 17 inside the single-plate laminate 12 is cured and integrated into a single-plate laminate by a continuous pressing method.

Various kinds of adhesives can be used as the above-mentioned adhesive, such as resorseal-formaldehyde resin adhesive,
Thermosetting of phenol-formaldehyde resin adhesive, melamine-formaldehyde resin adhesive, melamine-phenol-formaldehyde resin adhesive, urea-formaldehyde resin adhesive, epoxy resin adhesive, isocyanate resin adhesive, water-based vinyl urethane resin adhesive, etc. Resin adhesives are preferred. The adhesive includes hardeners such as paraformaldehyde, hexamethylenetetramine, ammonium chloride, polyamines, acid anhydrides, coconut shell powder, walnut shell powder, wood powder, wheat flour, soybean powder, calcium carbonate, zeolite, clay and the like. If necessary, a filler, a thickener such as polyvinyl alcohol, alcohols such as ethanol, methanol, ethylene glycol and the like can be added.

An adhesive 17 is attached to the veneer 15 and has a semicircular cross section.
As a linear coating method, a glue spreader device of a type in which a single plate is passed through a gap between coating rolls to perform roller coating, but a glue liquid is linearly coated from a glue head (ejection port) A coating method using a glue extruder apparatus of the type of flowing out and coating is preferable. An example of a coating system using this glue extruder device is shown in FIG.
As described below, a resin tank 19 and a slurry mixer 20 are installed on the upper portion of the pump 18, and the resin 18 is supplied with the main resin as an adhesive agent from the resin tank 19.
The slurry mixer 20 liquefies the curing agent (which may include a filler, etc.) and supplies it to the pump 18.
The pipe 2 is supplied to the pipe (static mixer) 21.
The mixture is uniformly mixed in 1 and the glue solution is linearly flown out from a glue head 23 having a large number of holes (nozzle holes) 22 at the tip of the tube 21 and applied to the adhered surface of the veneer 15. According to the coating system using this glue extruder,
Since the glue liquid is ejected linearly from the glue head, the application area is reduced, so that penetration and evaporation of the glue liquid that the roller system has are prevented, the deposition time can be extended, and the adhesive performance is also improved. In the present invention, it is preferable to use an adhesive suitable for a glue extruder apparatus of a type in which an adhesive paste solution is linearly flown out from the above-mentioned glue head, and a thixotropic agent such as ultrafine particulate anhydrous silica is used. It is preferable to use a resorcinol resin adhesive composition containing a resorcinol resin having a structural viscosity index adjusted to an appropriate range.

FIG. 3C shows an embodiment in which a protrusion-shaped adhesive layer is formed by using an adhesive sheet, and a plurality of single plates 15 on which the protrusion-shaped adhesive layer 17 is formed by the adhesive sheet.
In the same manner as above, the single plate laminate 12 is inserted into the side surface steam injection type continuous press 1, and the steam 14 is applied from the side surface orthogonal to the lamination surface of the single plate laminate 12 to the adhesive layer. After being introduced into 17, the internal temperature is raised, and then the single-plate laminate 12 is heat-pressed by the upper and lower hot plates 9 and 10, the adhesive is hardened and integrated to form a single-plate laminate material by the continuous pressing method. .

The veneer used in the present invention may be a coniferous tree or a hardwood species, and typical coniferous trees include pine, spruce pine, Todo pine, larch, bay pine, hemlock, bay fir, Examples include white fur, red cedar, agathis, and alder wood, and for hardwood, South Sea wood such as lauan, birch, beech wood, and the like.

According to the invention, the fiber direction 16 of the veneer 15 is
After depositing a plurality of veneers having a protrusion-shaped adhesive layer 17 formed orthogonally to the above, the veneer laminate 12 is inserted into the side surface steam jet type continuous press 1, and steam 14 is applied to the veneer laminate 1
The method of introducing into the adhesive layer 17 from the side of the laminated surface of No. 2 and raising the internal temperature, and then pressing the single plate laminated body 12 with the upper and lower heating plates 9 and 10 to bond and integrate them is adopted. When the steam 14 is introduced into the adhesive layer 17 from the side surface with respect to the laminated surface of the veneer laminate 12, a gap is formed between the veneers to form a passage for the steam 14 and to diffuse the jet steam 14 well. As a result, rapid supply of heat energy to the adhesive layer 17 by high-pressure steam and acceleration of curing of the adhesive 17 can be performed quickly, and it is possible to uniformly raise the temperature of all adhesive layers. According to the present invention, since the conventional hot press method is heating from the press heating platen, the larger the number of laminated veneer sheets, the longer the pressing time for press hardening to cure the adhesive. In the layer curing, unlike the conventional method, not only the front and back layers but also all the adhesive layers up to the inner layers start to be cured simultaneously and evenly, so that the adhesive curing time can be shortened. Further, when the side steam injection type continuous press is used, it is possible to provide an efficient method capable of continuously producing a laminated wood material by the continuous pressing method. Furthermore, since the protruding adhesive layer 17 is formed so as to be orthogonal to the fiber direction 16 of the veneer 15, it is possible to obtain a wood laminated material having high strength.

[0013]

EXAMPLES Next, examples of the present invention will be shown. Example 1 Using an extruder type coating machine (manufactured by Oshika Shinko Co., Ltd .; SRT coating machine) having a hole diameter of 3 mm and a hole interval of 5 mm, a resorcinol-formaldehyde resin adhesive having structural viscosity (manufactured by Oshika Shinko Co., Ltd .; trade name Dia) Nord 300
No.), which is orthogonal to the fiber direction, has a semicircular cross section and is applied linearly to form irregularities on the surface of the veneer.
mm, width 300 mm, length 1000 mm) 39 sheets are stacked and then inserted into a side steam injection type continuous press, pressure 1 kg /
6 kg of steam pressure using 6 steam injection nozzles attached to the side at equal intervals of 100 mm while temporarily tightening at cm ^2.
/ Cm ² at after steam injection 2 min, pressure 10 kg / c
A single plate laminated material integrally bonded was obtained by pressing at m ² for 5 minutes.

Example 2 A cedar veneer (thickness 3 mm, width 300 mm, laid on an adhesive sheet made of a resorcinol-formaldehyde resin adhesive (manufactured by Oshika Shinko Co., Ltd .; trade name: Dianol No. 300) orthogonal to the fiber direction. A single-plate laminated material integrally bonded and obtained in the same manner as in Example 1 except that a length of 1000 mm) was used.

[0015]

EFFECTS OF THE INVENTION According to the present invention, the heat energy can be rapidly supplied to the adhesive layer, the temperature can be uniformly increased to all the adhesive layers, and the curing of the adhesive can be accelerated quickly. It is possible to shorten the adhesive curing time. Further, by using the continuous pressing method, it is possible to provide a more efficient method capable of continuously producing a wooden laminated material. Further, it is possible to obtain a wood laminated material having high strength. The present invention can be applied not only to a single-plate laminated material but also to a laminated material using a sawn plate.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an example of a side steam jet type continuous press used in the present invention,

FIG. 2 is an explanatory view of an example of side surface steam injection according to the present invention,

3A is an explanatory view of an example of a coating mode in the present invention, FIG. 3B is an explanatory view of an example of the same stacking mode, and FIG. 3C is an explanatory view of an example of another stacking mode;

FIG. 4 is an explanatory view showing an example of a coating method using a glue extruder according to the present invention,

[Explanation of symbols]

1 ... Side steam injection type continuous press 2 ... Insertion conveyor 3 ... Upper idle roll 4 ... Top tension roll 5 ... Lower idle roll 6 ... Lower tension roll 7 ... Belt 8 ... Steam injection plate 9 ... Upper heating plate 10 ... Lower heat plate 11 ... Belt clamp press 12 ... Single plate laminated body 13 ... Cock in the steam injection plate 8 14 ... Steam 15 ... Single plate 16 ... Fiber direction 17 ... Adhesive 18 ... Pump 19 ... Resin tank 20 ... Slurry mixer 21 ... Tube (static mixer) 22 ... Nozzle 23 ... glue head

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Hikaru Sasaki 13-76, Kibatanyama, Uji-shi, Kyoto (72) Inventor, Fumiro Shirai, 1-4-1, 114, Teramoto, Itami-shi, Osaka (72) Inventor, Kuro Inui, Osaka 2-16-3 Tsutsumi-cho, Yao-shi, Japan (56) References JP-A-3-205101 (JP, A) JP-A-63-28601 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B27D 1/04 B27D 3/04 B27D 5/00

Claims (2)

(57) [Claims] 1. After depositing a plurality of veneers each having a protruding adhesive layer formed orthogonal to the fiber direction of the veneer, the veneer laminate is inserted into a steam jet type press to apply the vapour. A method for producing a wood laminated material, which comprises introducing the adhesive from a side surface of the board laminated body to raise an internal temperature, and then pressing and bonding the single board laminated body with upper and lower heating plates to integrally bond them. 2. The adhesive layer has a semicircular cross section and a linear contact.
The method for producing a wood laminated material according to claim 1, which is a binder layer .