JPH11147206A - Manufacture of plywood - Google Patents
Manufacture of plywoodInfo
- Publication number
- JPH11147206A JPH11147206A JP31830297A JP31830297A JPH11147206A JP H11147206 A JPH11147206 A JP H11147206A JP 31830297 A JP31830297 A JP 31830297A JP 31830297 A JP31830297 A JP 31830297A JP H11147206 A JPH11147206 A JP H11147206A
- Authority
- JP
- Japan
- Prior art keywords
- plywood
- formaldehyde
- solution
- formaldehyde scavenger
- aqueous
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000011120 plywood Substances 0.000 title claims abstract description 56
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims abstract description 199
- 239000002516 radical scavenger Substances 0.000 claims abstract description 34
- 239000007864 aqueous solution Substances 0.000 claims abstract description 18
- 239000000243 solution Substances 0.000 claims abstract description 18
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 8
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims abstract description 6
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 claims abstract description 6
- 150000001875 compounds Chemical class 0.000 claims abstract description 5
- 239000004202 carbamide Substances 0.000 claims abstract description 4
- 235000019270 ammonium chloride Nutrition 0.000 claims abstract description 3
- 239000000853 adhesive Substances 0.000 claims description 15
- 230000001070 adhesive effect Effects 0.000 claims description 15
- 238000007731 hot pressing Methods 0.000 claims description 12
- 230000000694 effects Effects 0.000 description 6
- 239000002023 wood Substances 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229920001807 Urea-formaldehyde Polymers 0.000 description 2
- YRKCREAYFQTBPV-UHFFFAOYSA-N acetylacetone Chemical compound CC(=O)CC(C)=O YRKCREAYFQTBPV-UHFFFAOYSA-N 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 2
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 229920000877 Melamine resin Polymers 0.000 description 1
- 239000004640 Melamine resin Substances 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000009408 flooring Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007761 roller coating Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 235000010265 sodium sulphite Nutrition 0.000 description 1
- 238000002798 spectrophotometry method Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000011232 storage material Substances 0.000 description 1
Landscapes
- Veneer Processing And Manufacture Of Plywood (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ホルムアルデヒド
の放出量を低減させた合板の製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing plywood with reduced formaldehyde emission.
【０００２】[0002]
【従来の技術】近年、木質系住宅内装材から室内に放出
されるホルムアルデヒドが化学物質過敏症の原因物質と
して問題視されている。すなわち、木質系住宅内装材は
合板、パーティクルボード、ＭＤＦ、化粧用集成材とい
った木質系基板に化粧加工を施したものが多いが、上記
基板の製造に使用された接着剤からホルムアルデヒドが
揮発するものである。2. Description of the Related Art In recent years, formaldehyde released from wood-based house interior materials into rooms has been regarded as a problem as a causative substance of chemical sensitivity. In other words, wood-based house interior materials are often made of wood-based substrates such as plywood, particle board, MDF, and laminated laminated wood, but the formaldehyde is volatilized from the adhesive used to manufacture the above-mentioned substrates. It is.
【０００３】例えば、合板は複数枚の単板を接着剤で張
り合わせることにより製造されるが、上記接着剤として
は原料中にホルムアルデヒドを含むユリア樹脂系接着
剤、メラミン樹脂系接着剤、フェノール樹脂系接着剤が
多用されている。したがって、合板を用いた木質系住宅
内装材（天井板、収納材、床材、腰板、巾木、回り縁、
パネル材等）からは、合板の製造に使用された接着剤中
に残留しているホルムアルデヒドや接着剤の分解により
生じたホルムアルデヒドが放出される。For example, plywood is manufactured by laminating a plurality of veneers with an adhesive. Examples of the adhesive include a urea resin-based adhesive containing formaldehyde in a raw material, a melamine resin-based adhesive, and a phenol resin. System adhesives are frequently used. Therefore, wood-based house interior materials using plywood (ceiling boards, storage materials, flooring, siding boards, skirting boards, peripheral edges,
Panel material) releases formaldehyde remaining in the adhesive used in the manufacture of the plywood and formaldehyde generated by decomposition of the adhesive.
【０００４】[0004]
【発明が解決しようとする課題】前述した理由から、近
年、ホルムアルデヒド放出量の少ない合板が強く要望さ
れており、ＪＡＳでも合板のホルムアルデヒド放出量に
関する規格が制定されている。これに対し、合板からホ
ルムアルデヒドを放出させないためには、ホルムアルデ
ヒドを含まない接着剤を用いることが最も好ましいが、
この方法では合板の製造コストが高くなる。For the reasons described above, plywood with a low formaldehyde emission has been strongly demanded in recent years, and JAS has established a standard for the formaldehyde emission of plywood. On the other hand, in order not to release formaldehyde from the plywood, it is most preferable to use an adhesive containing no formaldehyde,
This method increases the cost of manufacturing plywood.
【０００５】また、合板からのホルムアルデヒド放出量
を低減させる手段として、合板にホルムアルデヒドキャ
ッチシートを貼付する手段がある。しかし、この手段で
は十分なホルムアルデヒド放出量の低減効果を得ること
ができない上、ホルムアルデヒドキャッチシートの貼付
ラインが別途必要となるため合板の生産性が低下し、し
かも製造コストがかなり上昇する。As means for reducing the amount of formaldehyde released from plywood, there is a means for attaching a formaldehyde catch sheet to plywood. However, this method cannot provide a sufficient effect of reducing the amount of formaldehyde emission, and requires a separate line for attaching a formaldehyde catch sheet, which lowers the productivity of plywood and significantly increases the production cost.
【０００６】本発明は、上記事情に鑑みてなされたもの
で、合板からのホルムアルデヒド放出量を十分に低減さ
せることができる上、合板の生産性を低下させず、しか
も製造コストを大きく上昇させることのない合板の製造
方法を提供することを目的とする。[0006] The present invention has been made in view of the above circumstances, and it is possible to sufficiently reduce the amount of formaldehyde released from plywood, not to reduce the productivity of plywood, and to significantly increase the manufacturing cost. It is an object of the present invention to provide a plywood-free manufacturing method.
【０００７】[0007]
【課題を解決するための手段】本発明者は、前記目的を
達成するために鋭意検討を行った結果、ホルムアルデヒ
ドと反応してホルムアルデヒドを捕捉する化合物である
ホルムアルデヒド捕捉剤の水溶液を３０〜６０℃に加温
し、この加温したホルムアルデヒド捕捉剤水溶液をホッ
トプレス工程直後のまだ熱い状態の合板に付着させた場
合、下記〜の作用効果が得られ、前記目的が効果的
に達成されることを見出した。Means for Solving the Problems As a result of extensive studies to achieve the above object, the present inventor has found that an aqueous solution of formaldehyde scavenger, which is a compound that reacts with formaldehyde to scavenge formaldehyde, is heated at 30 to 60 ° C. When the heated aqueous formaldehyde scavenger solution is adhered to the still hot plywood immediately after the hot pressing step, the following effects are obtained, and the object is effectively achieved. I found it.
【０００８】加温したホルムアルデヒド捕捉剤水溶液
をホットプレス工程直後の合板に付着させると、ホルム
アルデヒド捕捉剤水溶液が合板中に良好に浸透するとと
もに、ホルムアルデヒド捕捉剤と接着剤中のホルムアル
デヒドとが効率的に反応してホルムアルデヒドが効果的
に捕捉される。その結果、合板のホルムアルデヒド放出
量に関するＪＡＳ規格のＦ１（平均ホルマリン濃度（水
中濃度）０．５ｍｇ／ｌ以下）を達成することができ
る。 ホルムアルデヒド捕捉剤水溶液を合板に付着させる装
置は、既存の合板製造ラインに付設できるため、生産性
の低下を招かない。 ホルムアルデヒド捕捉剤水溶液を合板に付着させるだ
けであるため、大きなコストアップ要因とならない。 ホルムアルデヒド捕捉剤は無害であり、しかも揮発性
物質ではないため、安全面、健康面で問題がない。 合板の板厚、構成、樹種によらず優れたホルムアルデ
ヒド放出量低減効果を得ることができる。 加温したホルムアルデヒド捕捉剤水溶液をホットプレ
ス工程直後の合板に付着させた場合、その後にホルムア
ルデヒド捕捉剤水溶液の水分が蒸発し易い。When the heated aqueous solution of formaldehyde scavenger is attached to the plywood immediately after the hot pressing step, the aqueous solution of formaldehyde scavenger permeates well into the plywood, and the formaldehyde scavenger and the formaldehyde in the adhesive are efficiently separated. Reacts to effectively trap formaldehyde. As a result, it is possible to achieve F1 (mean formalin concentration (concentration in water) of 0.5 mg / l or less) according to the JAS standard for formaldehyde emission from plywood. The device for attaching the aqueous solution of formaldehyde scavenger to the plywood can be attached to an existing plywood production line, so that productivity does not decrease. Since only the formaldehyde scavenger aqueous solution is attached to the plywood, it does not cause a significant cost increase. Since the formaldehyde scavenger is harmless and not a volatile substance, there is no problem in safety and health. An excellent formaldehyde emission reduction effect can be obtained regardless of the thickness, configuration, and tree type of the plywood. When the heated aqueous formaldehyde scavenger solution is adhered to the plywood immediately after the hot pressing step, the water content of the aqueous formaldehyde scavenger aqueous solution tends to evaporate thereafter.
【０００９】本発明は、上記知見に基づいてなされたも
ので、硬化後にホルムアルデヒドを放出する接着剤によ
り単板を張り合わせて合板を製造するに当たり、ホット
プレス工程の直後にホルムアルデヒド捕捉剤水溶液を３
０〜６０℃に加温した状態で合板表面に付着させること
を特徴とする合板の製造方法を提供する。The present invention has been made on the basis of the above findings. In manufacturing plywood by bonding veneers with an adhesive that releases formaldehyde after curing, an aqueous formaldehyde scavenger aqueous solution is used immediately after the hot pressing step.
Provided is a method for manufacturing a plywood, which is attached to a plywood surface while being heated to 0 to 60 ° C.
【００１０】以下、本発明につきさらに詳しく説明す
る。本発明において、ホルムアルデヒド捕捉剤水溶液と
しては、ホルムアルデヒドと反応してホルムアルデヒド
を捕捉する化合物の水溶液を用いる。上記化合物として
は、例えば、尿素、チオ尿素及び塩化アンモニウムから
選ばれる１種以上を好適に用いることができる。また、
ホルムアルデヒド捕捉剤水溶液には亜流酸ナトリウム等
の硫酸塩又は亜硫酸塩を添加することができ、これによ
って一層優れたホルムアルデヒド放出量低減効果を得る
ことができる。Hereinafter, the present invention will be described in more detail. In the present invention, an aqueous solution of a compound that reacts with formaldehyde to trap formaldehyde is used as the aqueous solution of formaldehyde scavenger. As the compound, for example, one or more selected from urea, thiourea and ammonium chloride can be suitably used. Also,
A sulfate or sulfite such as sodium sulfite can be added to the aqueous formaldehyde scavenger solution, whereby a more excellent formaldehyde emission reduction effect can be obtained.
【００１１】本発明では、上記ホルムアルデヒド捕捉剤
水溶液をホットプレス工程直後の合板の表面に付着させ
る。ホットプレス工程とは、単板に接着剤を塗布して重
ね合わせた後、通常１１０〜１４０℃程度で重ね合わせ
た単板を加熱加圧して接着剤を硬化させる工程である。
したがって、ホットプレス工程の直後における合板（単
板を重ね合わせたもの）の温度は、通常５０〜１００℃
程度になっている。本発明では、ホットプレス工程終了
後３分以内、特に２分以内にホルムアルデヒド捕捉剤水
溶液を合板表面に付着させることが望ましい。In the present invention, the aqueous formaldehyde scavenger solution is adhered to the surface of the plywood immediately after the hot pressing step. The hot pressing step is a step of applying an adhesive to the veneers and superimposing the veneers, and then heating and pressing the veneer veneers usually at about 110 to 140 ° C. to cure the adhesives.
Therefore, the temperature of the plywood (laminated veneer) immediately after the hot pressing step is usually 50 to 100 ° C.
It is about. In the present invention, it is desirable that the aqueous solution of formaldehyde scavenger be adhered to the surface of the plywood within 3 minutes, particularly within 2 minutes after the completion of the hot pressing step.
【００１２】この場合、本発明では、ホルムアルデヒド
捕捉剤水溶液を３０〜６０℃に加温した状態で合板の表
面に付着させる。ホルムアルデヒド捕捉剤水溶液の温度
が３０℃未満であると、ホルムアルデヒド捕捉剤水溶液
が合板中に浸透しにくくなるとともに、ホルムアルデヒ
ド捕捉剤とホルムアルデヒドとの反応効率が低下する。
また、ホルムアルデヒド捕捉剤水溶液の温度が６０℃を
超えると、ホルムアルデヒド捕捉剤の効果が低下する場
合が生じる。ホルムアルデヒド捕捉剤水溶液のより好ま
しい温度は、３５〜５５℃である。In this case, in the present invention, the aqueous formaldehyde scavenger solution is adhered to the surface of the plywood while being heated to 30 to 60 ° C. When the temperature of the aqueous solution of formaldehyde scavenger is lower than 30 ° C., the aqueous solution of formaldehyde scavenger does not easily penetrate into the plywood, and the reaction efficiency between the formaldehyde scavenger and formaldehyde decreases.
Further, when the temperature of the aqueous solution of formaldehyde scavenger exceeds 60 ° C., the effect of the formaldehyde scavenger may decrease. A more preferred temperature of the aqueous formaldehyde scavenger solution is from 35 to 55C.
【００１３】ホルムアルデヒド捕捉剤水溶液を合板の表
面に付着させる方法としては、スプレー塗布、ローラー
塗布、はけ塗り等の任意の方法を採用することができ
る。また、ホルムアルデヒド捕捉剤水溶液は合板の片面
のみに付着させてもよく、両面に付着させてもよいが、
より高いホルムアルデヒド放出量低減効果が得られる点
で両面に付着させることが適当である。As a method of adhering the aqueous formaldehyde scavenger solution to the surface of the plywood, any method such as spray coating, roller coating, brushing, etc. can be adopted. Also, the aqueous formaldehyde scavenger solution may be attached to only one side of the plywood, or may be attached to both sides,
It is appropriate to adhere to both surfaces in that a higher formaldehyde emission reduction effect can be obtained.
【００１４】ホルムアルデヒド捕捉剤水溶液の合板の表
面への付着量は、ホルムアルデヒド捕捉剤水溶液の濃度
等に応じて適宜設定できるが、通常、２〜６ｇ／ｍ2、
特に３〜５ｇ／ｍ2程度とする。ホルムアルデヒド捕捉
剤水溶液の付着量が多すぎると、合板表面のべたつき、
合板の含水率増加などが生じて後の加工工程で問題が起
こることがある。The amount of the aqueous solution of formaldehyde scavenger attached to the surface of the plywood can be appropriately set according to the concentration of the aqueous solution of formaldehyde scavenger, but is usually 2 to 6 g / m 2 ,
In particular, it is about 3 to 5 g / m 2 . If the amount of the formaldehyde scavenger aqueous solution is too large, the surface of the plywood becomes sticky,
In some cases, a problem may occur in a later processing step due to an increase in the moisture content of the plywood.
【００１５】[0015]
【発明の実施の形態】単板にユリア樹脂系接着剤を塗布
して重ね合わせた後、ホットプレス工程を行った。さら
に、５０℃に加温したホルムアルデヒド捕捉剤水溶液
（尿素水溶液）をホットプレス工程終了後２分以内に合
板の両面にスプレー塗布した。塗布量は４ｇ／ｍ2とし
た。得られた合板を乾燥させた後、その片面に化粧紙を
貼って化粧板を作製した。化粧紙を貼らない合板及び上
記化粧板を別々の測定室に放置し、それぞれのホルムア
ルデヒド放出量を１ヶ月間にわたって測定した。ホルム
アルデヒド濃度の測定は、アセチルアセトンによる吸光
光度法で行った。その結果、上記合板及び化粧板のいず
れもが、１ヶ月間にわたって合板のホルムアルデヒド放
出量に関するＪＡＳ規格のＦ１を満足することがわかっ
た。すなわち、検出されたホルマリン濃度（水中濃度）
は最大値でも０．５ｍｇ／ｌ以下であった。DESCRIPTION OF THE PREFERRED EMBODIMENTS After applying a urea resin-based adhesive to veneers and superimposing them, a hot pressing step was performed. Further, an aqueous formaldehyde scavenger solution (aqueous urea solution) heated to 50 ° C. was spray-coated on both surfaces of the plywood within 2 minutes after the completion of the hot pressing step. The coating amount was 4 g / m 2 . After drying the obtained plywood, decorative paper was stuck on one side of the plywood to prepare a decorative plate. The plywood without the decorative paper and the decorative plate were left in separate measurement rooms, and the amount of formaldehyde released was measured for one month. The measurement of the formaldehyde concentration was performed by an absorption spectrophotometric method using acetylacetone. As a result, it was found that both the plywood and the decorative board satisfy the JAS standard F1 regarding the formaldehyde emission amount of the plywood for one month. That is, the detected formalin concentration (concentration in water)
Was at most 0.5 mg / l.
【００１６】[0016]
【発明の効果】以上説明したように、本発明の合板の製
造方法は、合板からのホルムアルデヒド放出量を十分に
低減させることができる上、合板の生産性の低下を生じ
させず、しかも製造コストを大きく上昇させることがな
い。As described above, the method for manufacturing a plywood according to the present invention can sufficiently reduce the amount of formaldehyde released from the plywood, does not cause a decrease in the productivity of the plywood, and furthermore, the production cost is reduced. Does not rise significantly.
Claims (3)
着剤により単板を張り合わせて合板を製造するに当た
り、ホットプレス工程の直後にホルムアルデヒド捕捉剤
水溶液を３０〜６０℃に加温した状態で合板表面に付着
させることを特徴とする合板の製造方法。1. In producing plywood by bonding veneers with an adhesive that releases formaldehyde after curing, immediately after the hot pressing step, an aqueous formaldehyde scavenger solution is attached to the surface of the plywood while being heated to 30 to 60 ° C. A method for producing plywood, characterized in that:
ムアルデヒド捕捉剤水溶液を合板表面に付着させる請求
項１に記載の合板の製造方法。2. The method for producing a plywood according to claim 1, wherein the aqueous formaldehyde scavenger solution is adhered to the surface of the plywood within 3 minutes after completion of the hot pressing step.
素、チオ尿素及び塩化アンモニウムから選ばれる１種以
上の化合物を含む水溶液である請求項１又は２に記載の
合板の製造方法。3. The method according to claim 1, wherein the aqueous formaldehyde scavenger solution is an aqueous solution containing at least one compound selected from urea, thiourea and ammonium chloride.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9318302A JP3029597B2 (en) | 1997-11-19 | 1997-11-19 | Plywood manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9318302A JP3029597B2 (en) | 1997-11-19 | 1997-11-19 | Plywood manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11147206A true JPH11147206A (en) | 1999-06-02 |
| JP3029597B2 JP3029597B2 (en) | 2000-04-04 |
Family
ID=18097693
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9318302A Expired - Fee Related JP3029597B2 (en) | 1997-11-19 | 1997-11-19 | Plywood manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3029597B2 (en) |
-
1997
- 1997-11-19 JP JP9318302A patent/JP3029597B2/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| JP3029597B2 (en) | 2000-04-04 |
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