JP3855233B2 - Coating composition for the mouthpiece of a plate-like material and its coating method - Google Patents

Coating composition for the mouthpiece of a plate-like material and its coating method Download PDF

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JP3855233B2
JP3855233B2 JP2002118299A JP2002118299A JP3855233B2 JP 3855233 B2 JP3855233 B2 JP 3855233B2 JP 2002118299 A JP2002118299 A JP 2002118299A JP 2002118299 A JP2002118299 A JP 2002118299A JP 3855233 B2 JP3855233 B2 JP 3855233B2
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coating
plate
coating agent
liquid
minutes
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JP2003313503A (en
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徹 山崎
克明 田中
靖 田代
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株式会社J−ケミカル
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【0001】
【発明の属する技術分野】
本発明は、木質板、無機質板、有機・無機発泡体及びプラスチック、金属との複合板等の板状物の木口面の塗装方法に関するものである。
【0002】
【従来の技術】
木質板、無機質板、有機・無機発泡体及びプラスチック、金属との複合板等の板状物の表面には、原材料や製造工程に起因する凹凸、虫食い穴、割れ等の様々な欠陥部があり、そのままでは製品の外観が悪い上に仕上げ塗装、オーバーレイ等の二次加工時に問題となることが多い。
そのため、板状物表面の欠陥部を補修すると共にその表面性を向上させるために、種々の塗料を塗装する方法が採られてきた。
しかし、これらの塗装はあくまでも板状物の表面に限られており、その側面、すなわち木口面に関しては、これまで等閑にされてきたといっても過言ではない。合板等の木質板状物の場合、板状物の表面を塗装しても、温度や湿度の変化による板状物自体の収縮・膨張に表面の塗膜が追随、同調できず、塗膜が強靭かつ可撓性に富む場合には板状物が塗膜を突き上げて目浮きが生じ、逆に塗膜が脆弱な場合には塗膜が割れてクラックが発生することがある。
【0003】
そのため、合板などでは、剥き出しの木口から水分・湿気が徐々に滲入し、膨潤してしまい商品価値を損ねることが多かった。また、木口が剥き出しであるために、石膏ボード等の無機質板では端から脆弱化して欠損したり、塗装表面にユラギが発生したりすることが多い。単板積層板(LVL)やロックウール板などでは、木口面の凹凸等欠陥部がそのままになっているため、外観が見劣りするという問題があった。
一方、最近になって木口面をテーピングする方法も提案されてはいるが、作業が煩雑で、設備費用及び材料費が高くなるなどの欠点があり、また凹凸のある板状物に均一にテープ等を貼付するのは至難の技で、充分な補修効果が得られていないのが実情である。
板状物には通常、表面塗装等の表面加工が主として行われることから、塗装または加工装置の多くは、板状物は表面または裏面を上面とした状態で塗付装置等に送り込まれてくる構造となっている.そのため、本発明で塗付すべき木口面は通常直立面となっている。このような状態の木口面にむらなく塗付できる塗付剤および塗布方法が必要である。
【0004】
【発明が解決しようとする課題】
本発明の目的は、板状物の木口面に関する上記の問題点を克服し、品質の優れた板状物を製造するための木口用塗料およびその塗装方法を提供せんとするものである。
【0005】
【課題を解決するための手段】
この目的のために本発明者らは鋭意、検討を重ねた結果、特定の性状の塗料、更には木口に当該塗料をならい加圧し得る塗装方法を用いることにより、板状物の木口面を完全に補修・塗装できることを見出し本発明を完成した。
【0006】
すなわち、本発明は、板状物の木口用塗料組成物であって、下記(1)のスランプ試験による3分後の流動化幅が200mm以下及び流動化率が1.2以下で、下記(2)による塗膜の吸水率が1.0%以下であることを特徴とする板状物の木口用塗料組成物である。
(1)液状の塗料組成物100mlを内径50mmの円筒状容器に採取し、プラスチック板等の表面平滑なプレートで該容器の開口面を覆い反転させた後、直ちに容器を上方向へ引き上げ、引上げ1分後と3分後の塗料組成物のプレート面上での広がり直径(mm)を測定し、3分後の値を流動化幅とし、下式(I)による1分後と3分後の直径の比率を流動化率とする。上記において、塗料組成物が常温で液状物の場合はその状態で測定し、塗料組成物がホットメルトタイプのものの場合は、加熱して完全に液状として用い、円筒状容器および上記プレートは40℃に保温したものを使用して測定する。
流動化率 = 3分後の直径(mm)/1分後の直径(mm) (I)
本試験において,円筒状容器は内容物である塗料が容易に流出する材質からなるものであればよく、プラスチック製でも金属製でもよい。塗料組成物がホットメルト・タイプの場合には、加温時の流動化率を測定するため、金属製のものが好ましい。同様に,プレートも硬質ポリ塩化ビニル、ポリエチレン等のプラスチック板の他、ガラス板、ステンレス鋼等の金属板であってもよい。
【0007】
(2)30cm角のコンクリート型枠用合板等の合板表面に、塗料組成物(150g/m2)を均一に塗装し、120℃で3分乾燥する。該塗装合板の中央部に内径60mm、長さ150mmの例えばアクリル樹脂製透明パイプを直立設置し、パイプの下端を接着剤で合板に完全にシールし、室温で7日間養生した後、該合板とパイプの重量を測定する。当該パイプ内に50mmの高さまで注水し3時間静置する。当該パイプ内の水を捨てて合板とパイプの重量を測定する。下式により吸水率を求める。
吸水率(%)=〔(B−A)/A〕×100 (II)
但し、A:処理前の重量(g)
B:処理後の重量(g)
本試験におけるパイプは、塗装合板に完全シール状態で接着でき、吸水性のないものであれば使用できる。上記パイプの他に、例えば、ガラス管などが使用できる。
また本発明は、上述の特性の他に、105℃で3時間乾燥した際の不揮発分が50%以上であり、塗料組成物が常温で液状物の場合は、23℃における粘度が0.1〜100Pa・Sであり、ホットメルトタイプの場合は加温して完全に液状となる温度における粘度が0.1〜100Pa・Sであることを特徴とする板状物の木口用塗料組成物である。
さらに、本発明は送り装置により連続的または間歇的に搬送される板状物の木口面に塗付装置を用いて塗付剤を塗付する際に、塗付剤として上記塗料組成物を用いることを特徴とする板状物の木口塗装方法である。
【0008】
【発明の実施の形態】
本発明における板状物としては、合板(針葉樹合板、広葉樹合板、複合板、コンクリート型枠合板)、パーティクルボード、ハードボード、MDF、OSB、LVL等の木質板、フェノールフォーム、ユリアフォーム、メラミンフォーム、スチレンフォーム等の発泡板状物、セメント板、珪酸カルシウム板、クレー板、マグネシウム板、グラスウール板、ロックウール板等の無機質板、板紙、木毛板、金属サイジング板等があり、これらは予め表面を塗装した後に使用することもできる。
【0009】
本発明における塗料組成物は、流動化幅、流動化率および吸水率が上記範囲に入るものは全て使用できるが、具体的には、エポキシ樹脂、ウレタン樹脂、アクリル樹脂、およびユリア樹脂、メラミン樹脂、フェノール樹脂等のホルムアルデヒド系樹脂等がある。これらは溶液型、エマルジョン型のいずれも使用できる。更には湿気硬化型ウレタン樹脂塗料、EVA、BEP、ポリプロピレン(PP)、ポリエチレン、ポリスチレン、ポリウレタン等からなるホットメルト型塗布剤等も使用できる。これらは、1種単独でまたは2種以上を混合して使用することもできる。
また、本発明の塗料組成物には、塗料の分野で通常使用される、クレー、タルク、チタン、ガラス繊維、雲母、炭酸カルシウム等の無機物、木粉、小麦粉等の有機物を充填剤として配合しても良い。更には、必要に応じて撥水剤、架橋剤、カップリング剤、粘度調整剤、顔料、紫外線吸収剤、酸化防止剤等を配合しても良い。
【0010】
塗料組成物は、スランプ試験による流動化幅が3分後で200mmより大きいと、塗付直後に垂れてしまい、乾燥後に上下方向に厚みむらを生じ均一な塗膜を得ることができない。
また、塗膜の吸水率が1.0%を越えると、木口面に塗布したとき塗膜を通して木口面から湿気が板状物内部に浸透し、目浮きやクラックの発生を助長することになり好ましくない。
流動化率が1.2より大きいと、塗付剤が垂れ均一な塗膜が得られない。また塗料組成物(塗付剤)の伸びが大きく、木口面の補修すべき充填部に穴が開き、安定した防水性能を得ることができない。
一方、塗付剤としてホットメルトや湿気硬化型のウレタン樹脂などを使用する際には、105℃で3時間乾燥した際の不揮発分が50%以上であり、かつ加温し、完全に液状となる温度における粘度が0.1〜100Pa・Sであることが必要である。当該範囲をはずれた場合には、垂れやカスレが多発し、適切な塗付作業が行なえなくなる。
【0011】
塗付剤を塗付するための塗付装置は、被塗物である板状物を塗付部に送り込む送り装置と、塗付剤を供給する部材と、塗付剤を塗付する部材と、必要に応じて付加される塗付された塗膜面を摺圧するならい加圧する部材とからなる。
板状物の送り装置としては、通常この分野で使われているものが使用でき、例えば、ローラコンベア、無端ベルト、送りロール等が挙げられる。
塗付剤を板状物の木口面へ塗付するには、塗付剤供給部材から供給される塗付剤を、塗付する部材(塗付部材)により塗付し、塗付された塗付剤をならい加圧する部材により摺圧することによって行なう。本発明においてならい加圧とは、塗付部材またはブレード状のならい加圧部材の先端部が被塗物木口面に適当な面積で接するように加圧されて塗付された塗付剤を摺圧することをいう。ならい加圧部材としては、リバースロール、ドクターロール、ドクターナイフ等が使用される。
【0012】
塗付剤供給部材としては、塗付剤(塗料組成物)が比較的低粘度の液体の場合には、バットによるが、高粘度、高固形分あるいは二液混合の速硬化型の塗付剤の場合には、フイゴ状箱、シリンダー加圧型の注入機、ミキシングローター、スタテイックミキサー等を備えた押出し機等の供給部材が好適である。
上記においてフイゴ状箱とは、先端に向けて収斂する形で厚さが減少する箱型で、先端に幅方向に伸びた細幅のスリット状の塗布液吐出口を有し、該吐出口の上縁が更に先方に延びた舌片を有する塗付剤供給部材を言う。スリット状の吐出口より被塗物面に塗付された塗付液は前記舌片によって摺圧することができるため、塗付する部材とならい加圧部材とを兼ねさせることができる。
【0013】
塗付剤を塗付する部材および塗付剤をならい加圧する部材としては、以下の形態がある。塗付剤が比較的低粘度の場合には、塗付ロールとリバースロールを板状物の搬送方向に前記順序で板状物の木口面に当接する位置に配置し、塗付ロールで塗付剤を塗付し、リバースロールで塗付された塗付剤をならい加圧する。塗付ロールへの塗付剤の供給は、塗付ロールの近傍に配置したバット内の塗付液(塗付剤)を特殊な形状の供給ロールを介して塗付ロールに供給するか、またはフイゴ状箱に滞留する塗付液を板状物の木口面または塗付ロール面に吐出させて供給する。供給ロールは斜状にしたバータイプもしくは表面にスパイラル状に溝を設けたスパイラルロールなどが使用できる。この他、円筒内にスパイラルスクリューを内蔵した供給補助装置によってバット内の塗付液を汲み上げる方式によってもよい。上記において、リバースロールに代えてドクターナイフ状の金属板またはプラスチック板、もしくは固定したバーなどによって塗布液をならい加圧してもよい。
【0014】
なお、塗付量を多くするために、板状物の木口面に先端を近接させ得る単一もしくは複数の回転可能な翼や凹凸状のギヤタイプの塗付ロールを用いても良い。塗付剤はバットよりロールの上に流す循環タイプも使用することができる。
塗付剤が高粘度、高固形分あるいはニ液混合の速硬化型の場合には、塗付剤を塗付する部材および塗付剤をならい加圧する部材としては、1)先端に向けて厚さが収斂した形のナイフ状ないしはフイゴ状の形状のもの、2)エクストルーダーないしはカーテンコーターが好適である。
【0015】
また、塗付剤を塗付する部材および塗付剤をならい加圧する部材がロール状の場合に、塗付装置が温度調整機能を有すると共に板状物の木口面と接する面が開閉自在のガイド板による蓋がついた箱内に格納された構造のものも使用でき、この場合には、ドクターロールは板状物が送られてこない時は塗付ロール側に移動するため塗付剤の乾燥を防止できる
さらには、塗付剤を塗付する部材および塗付剤をならい加圧する部材が1)ナイフ状の形状を有するブレードであり、かつ該ブレードが板状物の木口面と平行および/または平行かつ垂直に設置されてなるもの、2)板状物の両木口面に平行して設置され、かつ塗付剤が木口面の一片に接触するように塗付液溜まりを切り込んだ形状を有するものも使用できる。その際、全面的に切込が入ると、塗付剤が収斂せず溢れ出てしまうため、所定の位置で切込みを抑える必要がある。
【0016】
【実施例】
以下に本発明の実施例を説明するが、本発明はこれらの例に限られるものではない。
【0017】
実施例および比較例
板状物として、合板、針葉樹合板(LVL)、OSB(配向性ストランドボード)、ファイバーボード(木毛板)、珪酸カルシウム板(珪カル板)、ロックウール板、発泡コンクリート板(フォーム)の各板を用いた。板厚(木口面の幅)はそれぞれ9〜12mmのものを使用した。
使用した塗付剤を以下に示す。
A:メラミン樹脂[(株)ホーネンコーポレーション製 ML-725]
配合:ML-725/塩化アンモニウム=100/1
B:水性ビニルウレタン樹脂[主剤:(株)ホーネンコーポレーション製
IW-130 架橋剤:(株)ホーネンコーポレーション製 K-1600]
配合:IW-130/K-1600=100/15
C:湿気硬化型ウレタン樹脂[(株)ホーネンコーポレーション製 IW-310]
D:エチレン・酢酸ビニル系ホットメルト[(株)ホーネンコーポレーション製HP-320]
E:ベンジリックエーテル型フェノール樹脂ホットメルト[(株)ホーネンコーポレーション製 PC-1F]
F:エポキシ樹脂[主剤:(株)ホーネンコーポレーション製 HE-11X架橋剤:(株)ホーネンコーポレーション製 ES-K01]
配合:HE-11X/ES-K01=100/20
G:アクリル系シーラー[(株)ホーネンコーポレーション製 AS-002]
H:酢酸ビニル樹脂エマルジョン[(株)ホーネンコーポレーション製VW-621]
I:手補修用アクリル変性パテ[(株)ホーネンコーポレーション製 HTP-13]
J:エポキシ樹脂エマルジョン[主剤:(株)ホーネンコーポレーション製 ES-005
架橋剤:(株)ホーネンコーポレーション製 ES−K01]
配合:ES-005/ES−K01=100/20
【0018】
各塗付剤の流動化幅、流動化率等の各特性並びに各塗装条件は各々表1、表2に示す。塗装後の板状物の結果も表1および2に併せて記載した。表中の目浮き、ゆらぎ、木口面のクラックは目視によって判定し、○は良好、●は良、△はやや不良、▲は不良、×は不可の各状態を示す。
但し、各実施例における塗付方法およびならい加圧の手段は、以下に各図にしたがって説明する方法および手段によって行った。
実施例1、2、3 図1
実施例4 図5
実施例5、6 図6(歯車状の塗付ロール122を板状物4の搬送方向と同
じ方向に回転させたとき「ならい加圧なし」)
実施例7 図8
実施例8〜11 図2
比較例1、2 図1
比較例3、4 図2
比較例5、6 図5(フィゴ状箱111の舌片113を板状物に強く押し当てない
様にしたとき「ならい加圧なし」)
比較例7、8 図1
【0019】
【表1】

Figure 0003855233
【0020】
【表2】
Figure 0003855233
【0021】
以下に本発明の塗付方法の実施例のいくつかを図面にしたがって説明する。以下の説明において、特記しない限り表裏面を上下とし、木口面を側面とした木口面の塗布方法を示す。
【0022】
図1は、木口面をロールで塗布し、リバースロールでならい加圧する塗付方法の一例を示す。図1Aは側面模式図、同図Bは平面図を示す。図中、1は塗付する部材としての塗付ロール、2は塗付剤をならい加圧するためのリバースロール、3は塗付剤を塗付ロールに供給するためのスパイラル状の溝を設けた塗付剤供給ロール、4は板状物、5は塗付剤、6は塗付剤掻き取り部材、7は塗付剤のバット、8は塗付剤供給ロールの外周を覆う半円筒体を示す。
バット7内の液状塗布剤5をロール面にスパイラル状の溝を設けた塗付剤供給ロール3の回転によって鉛直方向上部に移動させ、塗付ロール1面に転写させる。塗付ロール1に転写された塗付液(塗付剤)5は,塗付ロール1によって板状物4の木口面4aに塗布される。塗付された塗付液5aは、塗付ロール1よりも板状物4の搬送方向下流側に配置されたリバースロール2によってならい加圧され表面平滑に仕上げられる。塗付のみで、ならい加圧をしない場合は、リバースロール2は板状物に当接させない。
上記においてスパイラル状溝付き供給ロール3は、必要に応じて、塗付ロール1との当接面を除く外周を半円筒体8で覆うことによって塗付液の上昇をより確実なものとすることができる。
【0023】
リバースロール2に付着した塗付液はドクターナイフ状の掻き取り部材6によって掻き取りバット7内に戻す。
この塗付装置によるときは、塗付剤5は溶剤型またはエマルジョン型の液状塗付剤が好ましいが、液状とし得るものであればホットメルト型のものであってもよい。ホットメルト型塗付剤の場合は、バットおよび塗布ロール等を加温または加熱できるタイプとするとよい。バット内の溶剤型またはエマルジョン型塗付液は、別に設けた塗付液槽内の塗付液を循環させて均質な塗付液とする。
【0024】
図2は、図1と同様に液状の塗付剤を塗付する方法の別な例で、塗付ロール11および塗布剤供給ロール31を共に裁頭円錐型(かさ車型)とした例である。図2Aは板状物4の進行方向端面図、同図Bは上面図、同図Cは側面模式図を示す。塗付ロール11面が木口面4aと平行状態で当接するように各ロール面を傾斜させる。
バット7内の塗付液5は、供給ロール31によって持ち上げられて塗布ロール11に転写され、木口面4aに塗付される。図ではロールは2本としたが、塗付ロール11の直径を大きくし、供給ロール31を除く方法で、直接バット7内の塗付液5に塗付ロール11を浸して塗付してもよく、又塗付ロール11と供給ロール31の間に同様な形状の塗付液調整ロール(絞りロール)を設けてもよい。
塗付ロール11のみとするときは、必要に応じて、板状物4を傾斜させて木口面4aを塗付ロール11の面の傾斜に対応させて塗布してもよい。
塗付剤は図1の場合と同様に、溶剤型、エマルジョン型、ホットメルト型のいずれも使用できる。ロールは、円錐型でもかさ車型でもよく、また塗付量を多くするために、塗付ロールまたは供給ロールのいずれかまたは両方のロール面を凹凸状としたベベルギヤ(かさ歯車)型としてもよい。
木口面4aに塗付された塗付液5aはならい加圧部材21によって平滑面に仕上げられる。加圧部材は、ロールでもドクターナイフ状の板状体のいずれも使用できる。
【0025】
図3および図4は二液混合型塗付剤による塗付方法を示す模式図で、図3は混合吐出装置を示し、図4は塗付状態を示す。
混合吐出装置101としてはエクストルーダー等の混合押出しスクリューを備えた装置を使用し、例えば主剤Aと硬化剤Bを装置101に供給し混合して押し出す。
混合された塗付剤5の吐出方法は種々の方法が考えられるが、図4は吐出ヘッド102の先端に多数の吐出ノズル103を設け、このノズル103から塗付液5を木口面4aに押出して塗付する。塗付された塗付液は図1および図2の場合と同様にならい加圧部材で加圧して塗付面を均質化する。混合吐出装置は、主剤と硬化剤をインジェクターにより供給し、スタティックミキサーにより混合するものでもよい。吐出ノズルは塗付すべき木口面の幅に応じた長さの細幅のスリットとしてもよい。
【0026】
図5はスリット状の吐出ノズル(吐出口)から吐出塗布された塗付剤5を吐出口上縁の舌片でならい加圧する本明細書でフイゴ状箱と称した塗付部材によって塗付する方法の一例を示す図である。フイゴ状箱111は、木口面の幅(板厚)よりやや大きめの幅で、図示するように先端に塗付液吐出口112を有し、更にその先端に吐出口上縁が延びた形でならい加圧用の舌片113を有している。吐出口112は木口の幅よりやや狭い長さで、通常、細巾に開口したものとするが、塗付液は舌片113でならすことから小さな孔が連続した形で設けてもよい。フイゴ状箱111は、その後部の塗付剤供給口114から塗付剤5を供給し、吐出口112から吐出させて木口面4aに塗布し、舌片113でならい加圧する。フイゴ状箱111への塗付剤5の供給は、タンクTなどからポンプPなどを用いて耐圧ホース115などで供給するとよい。
フイゴ状箱111は木口面4aと接する角度を変えることによって、先端の舌片113のならい加圧する圧力を変えることができ、木口面4aとより平行に近い状態に配置することによってならい加圧のない状態とすることもできる。
【0027】
図6及び図7は、やや粘度の高い液状塗付剤の塗付方法に関する例である。図6は平面図、図7は断面模式図で、図示するように凹凸面が木口面4aに当たるように配置した歯車状の塗付ロール122を、木口面側の側端が開放された形の塗付液容器123内に配置し、容器123の側壁の一部の可動壁124をピストン125によって容器123の容積を増加・減少させることによって塗付量を調整できるようにした塗布装置121を示すものである。塗布装置121への塗付剤5の供給方法は特に限定されないが、本例ではタンクTから塗付量に応じて装置121内に流れ落ちて供給される構造となっている。塗付ロール122は板状物4の搬送方向と同じ方向に回転(正回転)させてもよく、また逆回転させて木口面4aに塗付された塗付液を摺圧するように作動させても良い。このように塗付ロール122を正回転させることによりならい加圧なしの塗付とし、逆回転させてならい加圧塗付とすることができる。
【0028】
図8及び図9は、前記図6及び図7の変形例で、歯車状の塗付ロールに代えて回転軸131にひょうたん形の塗付翼132を複数個備えた塗付具130を用いた例である。塗付具130は、木口面側の側端が開放された形の塗付液容器133で回転して塗付液を塗付する。塗付具130は正回転又は逆回転させて前記塗付ロール122と同様の作用をさせる。図中、134は板状物4の位置を調整するための調整板、135は塗付された塗付液を均すための加圧板で、それぞれピストン126によって作動される。塗付液容器133への塗付剤5の供給方法は特に限定されないが、本例ではタンクTから塗付量に応じて随時、塗付液容器133内に流れ落ちて供給される構造となっている。又、タンクTは温度調節することもできる。
【0029】
図10は、塗付液をならい加圧する方法の他の例を示す。図中、141は木口面4aのならい加圧板、142は板状物4の表面ならい加圧板、143は同裏面ならい加圧板を示す。
図11(a)に示すように、木口面4aに塗付された塗付液5はならい加圧板141で塗付面を加圧すると板状物4の表裏両面側にはみ出てくる場合がある。板状物4の表裏両面にはみ出た塗付液はそのままだと表裏面の塗膜が平滑にならないなどの問題があるので、はみ出た塗付液は表面及び裏面をならい加圧すると良い。塗付液の粘度が低い場合は、木口面の下方に垂れ下がるのみとなるので、この場合はならい加圧板141と裏面ならい加圧板143のみを用いても良い(図11(b)参照)。塗付液の粘度が若干高い場合には、板状物4の表裏両面側にはみ出すので、表面と裏面のならい加圧板142、143を併せて用いる(図11(c)参照)。
本例の場合、ならい加圧板はドクターナイフ状の薄い鋼板を用いても良いが、互いの加圧板の位置を合わせるのが難しいことから、図10(a)に示すように側面(木口面)、表面及び裏面の各加圧板とも板状物4の進入方向から板状物面に向かって板状物面に接するように次第に接近する曲面を有する厚みのある板体とすると良い。厚みのある板体からなるならい加圧板141、142、143は、図10(a)、(b)のように配置されるため、塗付液5は図11(c)に示すように板状物4の側端部に塗付される。
【0030】
図12と図13は前記図10の変形例で、厚みある板体の側面、すなわち木口面4aに当接する側面に塗付液溜まり151を設けたものをならい加圧板150として用いる方法である。塗付液溜まり151は、図10のならい加圧板に設ける曲面と同様な曲面を設けることにより、塗付された塗付液がならい加圧されるようにする。塗付液溜まり151には、適当な手段によって塗付液を塗付量に応じて供給する。本例のならい加圧板150は、板状物4の幅方向と同じ方向での断面が「』」型のように、板状物4の裏面にも当接する形状としてもよい。この場合、板状物4は例えば送りロール9で送るようにしてもよい。又、塗付液溜り151は、上方が開放されていても良いが、上方に蓋があると加圧塗布により導管や欠点部への充填を向上させることができる。
【0031】
本発明は、上記のとおり塗付剤の粘度及び流動度を所定の範囲の値に定めることによって、ほぼ垂直状態となっている木口面に対しても、平滑で且つ防水性、耐候性等に優れた塗付面が得られる。また、本発明で示す塗布方法及び塗付手段を用いることにより、容易に良好な塗付面を形成することができる。
【図面の簡単な説明】
【図1】本発明の木口面をロールで塗付し加圧する塗布方法の一実施例を示す側面及び断面模式図である。
【図2】本発明の傘車型ロール塗布方法の一例を示す模式図である。
【図3】押出し塗付機の一例を示す断面模式図である。
【図4】押出し塗付機による塗布方法の一例を示す模式図である。
【図5】フイゴ状箱による塗布方法の一例を示す模式図である。
【図6】歯車状ロールによる塗布方法の一例を示す模式図である。
【図7】歯車状ロールによる塗布方法を示す断面模式図である。
【図8】ひょうたん型塗付翼による塗布方法の一例を示す模式図である。
【図9】ひょうたん型塗付翼による塗布方法を示す断面模式図である。
【図10】塗付液をならい加圧する方法の一例を示す模式図である。
【図11】塗付液をならい加圧し塗付する方法の一例を示す断面模式図である。
【図12】塗付液溜りの塗付方法と加圧板により加圧する方法の一例を示す断面模式図である。
【図13】塗付液溜りの塗付方法の一例を示す模式図である
【符号の説明】
1 塗付ロール
2 ならい加圧用のリバースロール
3 塗付剤供給ロール
4 板状物
4a 板状物の木口面
5 塗付剤
6 塗付剤掻き取り部材
7 バット
11 塗付ロール
31 塗付剤供給ロール
111 フィゴ状箱[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for coating the mouth end of a plate-like material such as a wood board, an inorganic board, an organic / inorganic foam, a plastic, and a composite board with metal.
[0002]
[Prior art]
There are various defects such as irregularities, wormholes, cracks, etc. due to raw materials and manufacturing processes on the surface of wooden boards, inorganic boards, organic / inorganic foams and plastics, composite boards with metal, etc. If it is left as it is, the appearance of the product is poor, and there are many problems in secondary processing such as finish painting and overlay.
Therefore, in order to repair the defective part on the surface of the plate-like object and improve the surface property, methods of applying various paints have been adopted.
However, these paintings are limited only to the surface of the plate-like object, and it is no exaggeration to say that the side surfaces, that is, the end surfaces, have been made quiet so far. In the case of woody plate-like materials such as plywood, even if the surface of the plate-like material is painted, the coating film on the surface follows the shrinkage / expansion of the plate-like material due to changes in temperature and humidity, and the coating film cannot be synchronized. When it is strong and flexible, the plate-like object pushes up the coating film to cause eye floating, and conversely, when the coating film is fragile, the coating film may break and cracks may occur.
[0003]
For this reason, in plywood and the like, moisture and moisture gradually infiltrated from the exposed end of the wood and swelled, and the commercial value was often impaired. Moreover, since the end of the wood is bare, an inorganic board such as a gypsum board often becomes brittle from the end and is damaged, or a wrinkle is generated on the painted surface. Single plate laminates (LVL), rock wool plates, and the like have a problem in that the appearance is inferior because defects such as concavities and convexities on the mouth end are left as they are.
On the other hand, recently, a method for taping the end of the mouth has also been proposed, but there are drawbacks such as complicated work, high equipment costs and material costs, and uniform tape on uneven plates. Affixing etc. is a difficult technique, and the actual situation is that a sufficient repair effect has not been obtained.
Usually, surface processing such as surface coating is mainly performed on a plate-like object, so that many of the coating or processing apparatuses are sent to a coating apparatus or the like with the front surface or back surface of the plate-like object being the upper surface. It has a structure. Therefore, the end face to be coated in the present invention is usually an upright surface. There is a need for a coating agent and a coating method that can be applied evenly to the mouth end of such a state.
[0004]
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION An object of the present invention is to overcome the above-mentioned problems relating to the plate-like end of a plate-like material and to provide a wood-end paint and a method for coating the same for producing a plate-like product having excellent quality.
[0005]
[Means for Solving the Problems]
For this purpose, the present inventors have intensively studied, and as a result, by using a paint having a specific property, and further using a coating method that can pressurize the paint by applying the paint to the mouth, As a result, the present invention was completed.
[0006]
That is, the present invention is a coating material for a mouthpiece of a plate-like material, wherein the fluidization width after 3 minutes by the slump test of (1) below is 200 mm or less and the fluidization rate is 1.2 or less, and the following (2) A coating composition for a mouthpiece of a plate-like product, characterized in that the water absorption rate of the coating film is 1.0% or less.
(1) Collect 100 ml of the liquid coating composition into a cylindrical container with an inner diameter of 50 mm, cover the opening of the container with a smooth surface plate such as a plastic plate, invert the container, and then immediately pull the container upward and pull it up. The spread diameter (mm) on the plate surface of the coating composition after 1 minute and 3 minutes was measured, the value after 3 minutes was taken as the fluidization width, and after 1 minute and 3 minutes according to the following formula (I) Let the ratio of the diameters be the fluidization rate. In the above, when the coating composition is a liquid at room temperature, it is measured in that state. When the coating composition is of a hot melt type, it is heated and used completely as a liquid, and the cylindrical container and the plate are 40 ° C. Measure using a sample kept warm.
Fluidization rate = Diameter after 3 minutes (mm) / Diameter after 1 minute (mm) (I)
In this test, the cylindrical container may be made of a material from which the paint as the contents easily flows out, and may be made of plastic or metal. When the coating composition is of a hot melt type, a metallic one is preferable in order to measure the fluidization rate during heating. Similarly, the plate may be a plastic plate such as hard polyvinyl chloride or polyethylene, or a metal plate such as a glass plate or stainless steel.
[0007]
(2) A paint composition (150 g / m 2 ) is evenly applied to the surface of a plywood such as a 30 cm square concrete formwork plywood and dried at 120 ° C. for 3 minutes. A transparent pipe made of, for example, acrylic resin having an inner diameter of 60 mm and a length of 150 mm is installed upright in the center of the coated plywood, and the lower end of the pipe is completely sealed to the plywood with an adhesive and cured for 7 days at room temperature. Measure the weight of the pipe. Water is poured into the pipe to a height of 50 mm and left for 3 hours. Discard the water in the pipe and measure the weight of plywood and pipe. Obtain the water absorption rate using the following formula.
Water absorption rate (%) = [(B−A) / A] × 100 (II)
A: Weight before treatment (g)
B: Weight after treatment (g)
The pipe in this test can be used as long as it can adhere to a painted plywood in a completely sealed state and does not absorb water. In addition to the pipe, for example, a glass tube can be used.
In addition to the above-mentioned properties, the present invention has a non-volatile content of 50% or more when dried at 105 ° C. for 3 hours, and when the coating composition is a liquid at room temperature, the viscosity at 23 ° C. is 0.1-100 Pa. S, and in the case of a hot melt type, the viscosity is 0.1 to 100 Pa · S at a temperature at which it is heated and becomes completely liquid, and is a platy coating composition for a mouthpiece.
Furthermore, this invention uses the said coating composition as a coating agent, when apply | coating a coating agent using the coating device to the front end of the plate-shaped material conveyed continuously or intermittently by a feeder. This is a method for painting a plate-like object.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
As the plate-like material in the present invention, plywood (softwood plywood, hardwood plywood, composite board, concrete formwork plywood), particle board, hard board, wood board such as MDF, OSB, LVL, phenol foam, urea foam, melamine foam , Foam boards such as styrene foam, cement boards, calcium silicate boards, clay boards, magnesium boards, glass wool boards, rock wool boards and other inorganic boards, paperboard, wood wool boards, metal sizing boards, etc. It can also be used after painting the surface.
[0009]
As the coating composition in the present invention, those having fluidization width, fluidization rate and water absorption within the above ranges can be used. Specifically, epoxy resin, urethane resin, acrylic resin, urea resin, and melamine resin can be used. And formaldehyde resins such as phenol resins. These can be used in either a solution type or an emulsion type. Furthermore, moisture-curable urethane resin paints, EVA, BEP, polypropylene (PP), polyethylene, polystyrene, hot melt coating agents made of polyurethane, etc. can be used. These can also be used individually by 1 type or in mixture of 2 or more types.
In addition, the coating composition of the present invention contains inorganic substances such as clay, talc, titanium, glass fiber, mica and calcium carbonate, and organic substances such as wood flour and wheat flour, which are usually used in the field of coating materials, as fillers. May be. Furthermore, you may mix | blend a water repellent, a crosslinking agent, a coupling agent, a viscosity modifier, a pigment, a ultraviolet absorber, antioxidant, etc. as needed.
[0010]
If the fluidization width in the slump test is greater than 200 mm after 3 minutes, the coating composition will drip immediately after application, and unevenness in thickness will occur in the vertical direction after drying, making it impossible to obtain a uniform coating film.
Also, if the water absorption rate of the coating film exceeds 1.0%, moisture is infiltrated into the plate-like object from the surface of the mouth through the coating film when applied to the surface of the mouth, which is not preferable because it promotes the occurrence of floating eyes and cracks. .
When the fluidization rate is greater than 1.2, the coating agent drips and a uniform coating film cannot be obtained. Also, the elongation of the coating composition (coating agent) is large, and a hole is opened in the filling portion to be repaired on the end of the mouth, so that stable waterproof performance cannot be obtained.
On the other hand, when using hot melt or moisture-curing urethane resin as a coating agent, the non-volatile content when dried at 105 ° C for 3 hours is 50% or more and is heated to be completely liquid. It is necessary that the viscosity at a certain temperature is 0.1 to 100 Pa · S. If it falls outside the range, dripping and blurring occur frequently, making it impossible to perform appropriate application work.
[0011]
The coating apparatus for applying the coating agent includes a feeding device that feeds a plate-like object to be coated to the coating unit, a member that supplies the coating agent, and a member that applies the coating agent. And a member that pressurizes the applied coating surface that is applied as necessary.
As the plate-like material feeding device, those usually used in this field can be used, and examples thereof include a roller conveyor, an endless belt, a feeding roll, and the like.
In order to apply the coating agent to the end of the plate-like material, the coating agent supplied from the coating agent supply member is applied by the member to be applied (coating member), and the applied coating is applied. It is carried out by sliding pressure with a member that pressurizes the additive. In the present invention, the superficial pressurization means that the coating agent applied by applying pressure so that the tip of the coating member or the blade-like superficial pressurizing member is in contact with the surface of the object to be coated in an appropriate area. It means to press. As the pressurizing member, a reverse roll, a doctor roll, a doctor knife or the like is used.
[0012]
As a coating agent supply member, when the coating agent (coating composition) is a liquid with a relatively low viscosity, depending on the vat, a high viscosity, high solid content or two-component mixed fast-curing coating agent is used. In this case, a supply member such as an extrusion machine equipped with a figo box, a cylinder pressurization type injection machine, a mixing glotter, a static mixer or the like is suitable.
In the above description, the figo-shaped box is a box shape that converges toward the tip and decreases in thickness, and has a narrow slit-like coating liquid discharge port extending in the width direction at the tip. The coating material supply member has a tongue piece whose upper edge extends further forward. Since the application liquid applied to the surface of the object to be coated from the slit-shaped discharge port can be slid by the tongue piece, it can serve as a pressure member as well as a member to be applied.
[0013]
Examples of the member to be applied with the coating agent and the member to be pressurized along with the coating agent include the following modes. If the coating agent has a relatively low viscosity, place the coating roll and reverse roll in the order of contact with the top edge of the plate-like material in the order of conveyance in the plate-like material, and apply with the coating roll. Apply the agent and pressurize the agent applied with the reverse roll. Supply of the coating agent to the coating roll is performed by supplying the coating liquid (coating agent) in the vat arranged in the vicinity of the coating roll to the coating roll via a special-shaped supply roll, or The coating liquid staying in the figo-like box is supplied by being discharged onto the plate end or coating roll surface. The supply roll can be a slanted bar type or a spiral roll having spiral grooves on the surface. In addition, a system in which the coating liquid in the bat is pumped up by a supply auxiliary device incorporating a spiral screw in the cylinder may be used. In the above, instead of the reverse roll, the coating liquid may be pressurized by a doctor knife-like metal plate or plastic plate, or a fixed bar.
[0014]
In order to increase the coating amount, a single or a plurality of rotatable wings or uneven gear-type coating rolls whose tips can be brought close to the end of the plate-like object may be used. A circulating type in which the coating agent is allowed to flow over a roll from a vat can also be used.
When the coating agent is a high viscosity, high solid content or two-component mixed fast-curing type, as a member to apply the coating agent and a member to pressurize the coating agent, 1) Thickness toward the tip A converging knife-like or figo-like shape, 2) an extruder or a curtain coater is preferred.
[0015]
In addition, when the member to which the coating agent is applied and the member to be pressurized along with the coating agent are in the form of a roll, the coating device has a temperature adjustment function and the surface that contacts the front end of the plate-like object can be opened and closed. It is also possible to use a structure stored in a box with a lid with a plate. In this case, the doctor roll moves to the coating roll side when the plate-shaped object is not sent, so the coating agent is dried. Further, the member to which the coating agent is applied and the member to be pressed in accordance with the coating agent are 1) a blade having a knife-like shape, and the blade is parallel to the end surface of the plate-like material and / or Or parallel and vertically installed, 2) installed in parallel to both sides of the plate-like object, and cut into the coating liquid reservoir so that the coating agent contacts one piece of the side of the mouth. It can also be used. At that time, if the entire cut is made, the coating agent does not converge and overflows, so it is necessary to suppress the cut at a predetermined position.
[0016]
【Example】
Examples of the present invention will be described below, but the present invention is not limited to these examples.
[0017]
Examples and comparative examples As plywood, plywood, softwood plywood (LVL), OSB (oriented strand board), fiber board (wood wool board), calcium silicate board (silical board), rock wool board, foamed concrete board Each plate of (form) was used. The plate thickness (the width of the end face) was 9 to 12 mm.
The used coating agent is shown below.
A: Melamine resin [ML-725, manufactured by Honen Corporation]
Formula: ML-725 / Ammonium chloride = 100/1
B: Water-based vinyl urethane resin [Main agent: IW-130 manufactured by Hornen Corporation] Crosslinking agent: K-1600 manufactured by Hornen Corporation
Formula: IW-130 / K-1600 = 100/15
C: Moisture curable urethane resin [IW-310, manufactured by Hornen Corporation]
D: Ethylene / vinyl acetate hot melt [HP-320 manufactured by Hornen Corporation]
E: Benzyl ether type phenolic resin hot melt [PC-1F manufactured by Honen Corporation]
F: Epoxy resin [Main agent: HE-11X cross-linking agent manufactured by Hornen Corporation: ES-K01, manufactured by Hornen Corporation]
Formula: HE-11X / ES-K01 = 100/20
G: Acrylic sealer [AS-002 manufactured by Honen Corporation]
H: Vinyl acetate resin emulsion [VW-621, Honen Corporation]
I: Acrylic modified putty for hand repair [HTP-13 manufactured by Hornen Corporation]
J: Epoxy resin emulsion [Main agent: ES-005 manufactured by Hornen Corporation
Crosslinking agent: ES-K01 manufactured by Hornen Corporation
Formula: ES-005 / ES-K01 = 100/20
[0018]
Tables 1 and 2 show the characteristics of each coating agent, such as the fluidization width and fluidization rate, and the respective coating conditions. The results of the plate-like product after coating are also shown in Tables 1 and 2. In the table, eye floating, fluctuation, and cracks on the mouth end are visually determined, and ○ indicates good, ● indicates good, Δ indicates slightly poor, ▲ indicates poor, and × indicates impossible.
However, the application method and the pressurizing means in each example were carried out by the methods and means described below with reference to the drawings.
Examples 1, 2, and 3
Example 4 FIG.
Examples 5 and 6 FIG. 6 (Gear-shaped coating roll 122 is the same as the conveying direction of plate-like object 4.
”No pressurization when rotating in the same direction”)
Example 7 FIG.
Examples 8-11 FIG.
Comparative Examples 1 and 2
Comparative Examples 3 and 4
Comparative Examples 5 and 6 FIG. 5 (The tongue 113 of the figo box 111 is not pressed strongly against the plate-like object.
When you do, “No pressure applied”)
Comparative Examples 7 and 8
[0019]
[Table 1]
Figure 0003855233
[0020]
[Table 2]
Figure 0003855233
[0021]
Several examples of the coating method of the present invention will be described below with reference to the drawings. In the following description, unless otherwise specified, an application method of the mouth end surface with the front and back surfaces being up and down and the end surface being the side surface is shown.
[0022]
FIG. 1 shows an example of a coating method in which the end surface is coated with a roll and pressurized with a reverse roll. 1A is a schematic side view, and FIG. 1B is a plan view. In the figure, 1 is a coating roll as a member to be coated, 2 is a reverse roll for pressurizing following the coating agent, 3 is provided with a spiral groove for supplying the coating agent to the coating roll Coating agent supply roll, 4 is a plate, 5 is a coating agent, 6 is a coating agent scraping member, 7 is a coating agent bat, and 8 is a semi-cylindrical body covering the outer periphery of the coating agent supply roll. Show.
The liquid coating agent 5 in the bat 7 is moved to the upper part in the vertical direction by the rotation of the coating agent supply roll 3 provided with spiral grooves on the roll surface, and transferred to the coating roll 1 surface. The coating liquid (coating agent) 5 transferred to the coating roll 1 is applied to the wood end surface 4 a of the plate-like object 4 by the coating roll 1. The applied coating liquid 5a is pressurized and finished with a smooth surface by the reverse roll 2 disposed downstream of the coating roll 1 in the conveying direction of the plate-like object 4. The reverse roll 2 is not brought into contact with the plate-like object when only the application is performed and no pressure is applied.
In the above, the spirally-grooved supply roll 3 covers the outer periphery excluding the contact surface with the coating roll 1 with a semi-cylindrical body 8 as necessary, thereby ensuring the increase of the coating liquid. Can do.
[0023]
The coating liquid adhering to the reverse roll 2 is returned to the scraping bat 7 by the doctor knife-like scraping member 6.
When using this coating apparatus, the coating agent 5 is preferably a solvent-type or emulsion-type liquid coating agent, but may be a hot-melt type as long as it can be liquid. In the case of a hot-melt type coating agent, it is preferable to use a type that can heat or heat the vat and coating roll. The solvent-type or emulsion-type coating liquid in the vat is circulated through a coating liquid in a separately provided coating liquid tank to form a uniform coating liquid.
[0024]
FIG. 2 is another example of a method of applying a liquid coating agent in the same manner as in FIG. 1, and is an example in which both the coating roll 11 and the coating agent supply roll 31 are frusto-conical (shackle type). . 2A is an end view in the traveling direction of the plate-like object 4, FIG. 2B is a top view, and FIG. 2C is a schematic side view. Each roll surface is inclined so that the surface of the coating roll 11 abuts in parallel with the end surface 4a.
The coating liquid 5 in the bat 7 is lifted by the supply roll 31, transferred to the coating roll 11, and applied to the end surface 4a. In the figure, the number of rolls is two, but the diameter of the coating roll 11 is increased and the coating roll 11 is directly immersed in the coating liquid 5 in the bat 7 by the method of removing the supply roll 31. Alternatively, a coating liquid adjusting roll (squeezing roll) having a similar shape may be provided between the coating roll 11 and the supply roll 31.
When only the coating roll 11 is used, if necessary, the plate-like object 4 may be inclined and the end surface 4a may be applied in correspondence with the inclination of the surface of the coating roll 11.
As in the case of FIG. 1, any of a solvent type, an emulsion type, and a hot melt type can be used as the coating agent. The roll may be a cone type or a bevel wheel type, and may be a bevel gear (bevel gear) type in which either or both of the coating roll and the supply roll have an uneven surface in order to increase the coating amount.
The coating liquid 5a applied to the end surface 4a is finished to a smooth surface by the follow-up pressure member 21. As the pressure member, either a roll or a doctor knife-like plate can be used.
[0025]
3 and 4 are schematic diagrams showing a coating method using a two-component mixed coating agent, FIG. 3 shows a mixed discharge device, and FIG. 4 shows a coating state.
As the mixing and discharging apparatus 101, an apparatus having a mixing and extruding screw such as an extruder is used. For example, the main agent A and the curing agent B are supplied to the apparatus 101, mixed and extruded.
Although various methods can be considered for discharging the mixed coating agent 5, FIG. 4 shows that a large number of discharge nozzles 103 are provided at the tip of the discharge head 102, and the coating liquid 5 is extruded from the nozzle 103 onto the end surface 4 a. Apply. The applied coating solution is pressurized with a pressure member in the same manner as in FIGS. 1 and 2 to homogenize the coated surface. The mixing and discharging apparatus may supply the main agent and the curing agent with an injector and mix them with a static mixer. The discharge nozzle may be a narrow slit having a length corresponding to the width of the end face to be coated.
[0026]
FIG. 5 shows that the coating material 5 discharged and applied from the slit-shaped discharge nozzle (discharge port) is applied by a coating member referred to as a figo-shaped box in the present specification that pressurizes along the tongue at the upper edge of the discharge port. It is a figure which shows an example of a method. The figo box 111 has a width slightly larger than the width (plate thickness) of the mouth end surface, and has a coating liquid discharge port 112 at the tip as shown in the figure, and further has an upper edge of the discharge port extending at the tip. It has a tongue 113 for pressurizing. The discharge port 112 has a length that is slightly narrower than the width of the end, and is usually opened narrowly. However, since the coating liquid is smoothed by the tongue piece 113, a small hole may be provided continuously. The figo-like box 111 supplies the coating agent 5 from the coating agent supply port 114 at the rear thereof, discharges it from the discharge port 112, applies it to the wooden end surface 4 a, and pressurizes it with the tongue piece 113. The supply of the coating agent 5 to the figo-like box 111 is preferably performed from the tank T or the like using the pressure hose 115 or the like using the pump P or the like.
By changing the angle of contact with the mouth surface 4a, the figo-shaped box 111 can change the pressure applied to the tongue piece 113 at the tip, and the pressure can be increased by placing it closer to the mouth surface 4a. It can also be in a state without.
[0027]
6 and 7 are examples relating to a coating method of a liquid coating agent having a slightly high viscosity. FIG. 6 is a plan view, and FIG. 7 is a schematic cross-sectional view. As shown in the figure, a gear-shaped coating roll 122 arranged so that the concavo-convex surface is in contact with the mouth end surface 4a is shown, with the side end on the end end side being opened. The coating device 121 is disposed in the coating liquid container 123, and the movable wall 124, which is a part of the side wall of the container 123, can be adjusted by increasing or decreasing the volume of the container 123 by the piston 125. Is. The method for supplying the coating agent 5 to the coating device 121 is not particularly limited, but in this example, the coating agent 5 flows from the tank T into the device 121 according to the coating amount and is supplied. The coating roll 122 may be rotated (forward rotation) in the same direction as the conveying direction of the plate-like object 4, or may be reversely rotated so as to slidably apply the coating liquid applied to the end surface 4 a. Also good. In this way, the coating roll 122 can be rotated in the forward direction to perform coating without pressure, and can be rotated in the reverse direction to perform pressure coating.
[0028]
FIGS. 8 and 9 are modified examples of FIGS. 6 and 7, in which a coating tool 130 having a plurality of gourd-shaped coating blades 132 on the rotating shaft 131 is used instead of the gear-shaped coating roll. It is an example. The applicator 130 is rotated by the application liquid container 133 having a side end on the side of the mouth end opened to apply the application liquid. The applicator 130 is rotated in the forward or reverse direction to perform the same action as the applicator roll 122. In the figure, 134 is an adjustment plate for adjusting the position of the plate-like object 4, and 135 is a pressure plate for leveling the applied coating liquid, each of which is operated by the piston 126. The method for supplying the coating agent 5 to the coating liquid container 133 is not particularly limited, but in this example, the coating liquid 5 is supplied from the tank T by flowing down into the coating liquid container 133 as needed according to the coating amount. Yes. The temperature of the tank T can also be adjusted.
[0029]
FIG. 10 shows another example of the method of pressurizing the coating liquid. In the figure, reference numeral 141 denotes a pressure plate following the end face 4a, 142 denotes a pressure plate corresponding to the front surface of the plate-like object 4, and 143 denotes a pressure plate corresponding to the same back surface.
As shown in FIG. 11 (a), the coating liquid 5 applied to the end surface 4a may protrude from the front and back sides of the plate-like object 4 when the applied surface is pressurized by the pressure plate 141. . If the coating solution that protrudes from both the front and back surfaces of the plate-like material 4 is left as it is, there is a problem that the coating film on the front and back surfaces does not become smooth. Therefore, the protruding coating solution may be pressurized along the front and back surfaces. When the viscosity of the coating liquid is low, it only hangs down below the end face, and in this case, only the pressure plate 141 and the back surface pressure plate 143 may be used (see FIG. 11B). When the viscosity of the coating liquid is slightly high, the plate-like product 4 protrudes from both the front and back sides, so that the pressure plates 142 and 143 that are the front and back sides are used together (see FIG. 11C).
In the case of this example, a doctor knife-like thin steel plate may be used as the pressure plate, but it is difficult to align the positions of the pressure plates, so as shown in FIG. Each of the pressure plates on the front surface and the back surface is preferably a thick plate body having a curved surface that gradually approaches the plate-like object surface from the approach direction of the plate-like object 4 toward the plate-like object surface. Since the pressurizing plates 141, 142, 143 made of a thick plate are arranged as shown in FIGS. 10A and 10B, the coating liquid 5 has a plate shape as shown in FIG. 11C. It is applied to the side edge of the object 4.
[0030]
FIG. 12 and FIG. 13 show a modification of FIG. 10 in which a thick plate body, that is, a side surface that abuts on the butt face 4a is provided with a coating liquid reservoir 151 and used as a pressure plate 150. FIG. The coating liquid reservoir 151 is provided with a curved surface similar to the curved surface provided on the profile pressure plate in FIG. 10 so that the applied coating solution is pressurized. A coating liquid is supplied to the coating liquid reservoir 151 according to the coating amount by an appropriate means. The pressure plate 150 according to this example may have a shape in which the cross section in the same direction as the width direction of the plate-like object 4 is also in contact with the back surface of the plate-like object 4 like a “” ”type. In this case, the plate-like object 4 may be fed by, for example, a feed roll 9. Further, the upper part of the coating liquid reservoir 151 may be opened. However, if there is a lid on the upper side, the filling of the conduit and the defective part can be improved by pressure application.
[0031]
In the present invention, as described above, by setting the viscosity and fluidity of the coating agent to values in a predetermined range, even with a substantially vertical end, smooth and waterproof, weather resistance, etc. Excellent coated surface can be obtained. Further, by using the coating method and the coating means shown in the present invention, a good coated surface can be easily formed.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a schematic side view and cross-sectional view showing an embodiment of a coating method in which the end surface of the present invention is applied with a roll and pressed.
FIG. 2 is a schematic view showing an example of an umbrella wheel type roll coating method of the present invention.
FIG. 3 is a schematic sectional view showing an example of an extrusion coating machine.
FIG. 4 is a schematic diagram showing an example of a coating method using an extrusion coater.
FIG. 5 is a schematic view showing an example of a coating method using a figo box.
FIG. 6 is a schematic diagram showing an example of a coating method using a gear-shaped roll.
FIG. 7 is a schematic cross-sectional view showing a coating method using a gear-shaped roll.
FIG. 8 is a schematic diagram showing an example of a coating method using a gourd type coating blade.
FIG. 9 is a schematic sectional view showing a coating method using a gourd type coating blade.
FIG. 10 is a schematic view showing an example of a method of pressurizing the coating liquid along with it.
FIG. 11 is a schematic cross-sectional view showing an example of a method of applying pressure by applying a coating liquid.
FIG. 12 is a schematic cross-sectional view showing an example of a coating liquid reservoir coating method and a method of applying pressure with a pressure plate.
FIG. 13 is a schematic diagram showing an example of a method for applying a coating liquid reservoir.
DESCRIPTION OF SYMBOLS 1 Coating roll 2 Reverse roll for pressure-applying 3 Coating agent supply roll 4 Plate-like object 4a Wood-like surface 5 of a plate-like substance Coating agent 6 Coating agent scraping member 7 Butt 11 Coating roller 31 Coating agent supply roll
111 figo box

Claims (13)

板状物の木口用塗料組成物であって、下記(1)のスランプ試験による3分後の流動化幅が200mm以下及び流動化率が1.2以下で、下記(2)による塗膜の吸水率が1.0%以下であることを特徴とする板状物の木口用塗料組成物。
(1)液状の塗料組成物100mlを内径50mmの円筒状容器に採取し、プラスチック板等の表面平滑なプレートで該容器の開口面を覆い反転させた後、直ちに容器を上方向へ引き上げ、引上げ1分後と3分後の塗料組成物のプレート面上での広がり直径(mm)を測定し、3分後の値を流動化幅とし、下式(I)による1分後と3分後の直径の比率を流動化率とする。上記において、塗料組成物が常温で液状物の場合はその状態で測定し、塗料組成物がホットメルトタイプのものの場合は、加熱して完全に液状として用い、円筒状容器および上記プレートは40℃に保温したものを使用して測定する。
流動化率= 3分後の直径(mm)/1分後の直径(mm) (I)
(2)30cm角の合板表面に、塗料組成物(150g/m2)を均一に塗装し、120℃で3分乾燥して塗装合板を作製し、該塗装合板の中央部に内径60mm、長さ150mmの透明パイプを直立載置し、パイプの下端を塗装合板面に接着剤等で接着シールし、室温で7日間養生した後、該パイプ付き合板の重量を測定し、次に当該パイプ内に50mmの高さまで注水して3時間静置し、しかる後当該パイプ内の水を捨ててパイプ付き合板の重量を測定し、下式(II)により吸水率を求める。
吸水率(%)=〔(B−A)/A〕×100 (II)
但し、A:処理前の重量(g)
B:処理後の重量(g)
It is a coating composition for the mouthpiece of a plate-like material, and the fluidization width after 3 minutes by the slump test of (1) below is 200 mm or less and the fluidization rate is 1.2 or less, and the water absorption rate of the coating film by (2) below A coating composition for a mouthpiece of a plate-like material, characterized in that the ratio is 1.0% or less.
(1) Collect 100 ml of the liquid coating composition into a cylindrical container with an inner diameter of 50 mm, cover the opening of the container with a smooth surface plate such as a plastic plate, invert the container, and then immediately pull the container upward and pull it up. The spread diameter (mm) on the plate surface of the coating composition after 1 minute and 3 minutes was measured, the value after 3 minutes was taken as the fluidization width, and after 1 minute and 3 minutes according to the following formula (I) Let the ratio of the diameters be the fluidization rate. In the above, when the coating composition is a liquid at room temperature, it is measured in that state. When the coating composition is of a hot melt type, it is heated and used completely as a liquid, and the cylindrical container and the plate are 40 ° C. Measure using a sample kept warm.
Fluidization rate = Diameter after 3 minutes (mm) / Diameter after 1 minute (mm) (I)
(2) A paint composition (150 g / m 2 ) is uniformly applied to the surface of a 30 cm square plywood and dried at 120 ° C. for 3 minutes to produce a coated plywood. A 150mm transparent pipe is placed upright, and the lower end of the pipe is adhesively sealed to the painted plywood surface with an adhesive or the like. After curing for 7 days at room temperature, the weight of the plywood with pipe is measured, Water is then poured to a height of 50 mm and left to stand for 3 hours. After that, the water in the pipe is discarded, the weight of the plywood with the pipe is measured, and the water absorption is obtained by the following formula (II).
Water absorption rate (%) = [(B−A) / A] × 100 (II)
A: Weight before treatment (g)
B: Weight after treatment (g)
105℃で3時間乾燥した際の不揮発分が50%以上であり、塗料組成物が常温で液状物の場合は、23℃における粘度が0.1〜100Pa・Sであり、ホットメルトタイプの場合は加温して完全に液状となる温度における粘度が0.1〜100Pa・Sである請求項1に記載の板状物の木口用塗料組成物。When it is dried at 105 ° C for 3 hours, the non-volatile content is 50% or more. When the coating composition is liquid at room temperature, the viscosity at 23 ° C is 0.1-100 Pa · S. The coating composition for a mouthpiece of a plate-like product according to claim 1, having a viscosity of 0.1 to 100 Pa · S at a temperature at which it becomes completely liquid when heated. 送り装置により連続的または間歇的に搬送される板状物の木口面に塗付装置を用いて塗付剤を塗付する際に、塗付剤が、下記(1)のスランプ試験による3分後の流動化幅が200mm以下及び流動化率が1.2以下で、下記(2)による塗膜の吸水率が1.0%以下であることを特徴とする板状物の木口塗装方法。
(1)液状の塗料組成物100mlを内径50mmの円筒状容器に採取し、プラスチック板等の表面平滑なプレートで該容器の開口面を覆い反転させた後、直ちに容器を上方向へ引き上げ、引上げ1分後と3分後の塗料組成物のプレート面上での広がり直径(mm)を測定し、3分後の値を流動化幅とし、下式(I)による1分後と3分後の直径の比率を流動化率とする。上記において、塗料組成物が常温で液状物の場合はその状態で測定し、塗料組成物がホットメルトタイプのものの場合は、加熱して完全に液状として用い、円筒状容器および上記プレートは40℃に保温したものを使用して測定する。
流動化率= 3分後の直径(mm)/1分後の直径(mm) (I)
(2)30cm角の合板表面に、塗料組成物(150g/m2)を均一に塗装し、120℃で3分乾燥して塗装合板を作製し、該塗装合板の中央部に内径60mm、長さ150mmの透明パイプを直立載置し、パイプの下端を塗装合板面に接着剤等で接着シールし、室温で7日間養生した後、該パイプ付き合板の重量を測定し、次に当該パイプ内に50mmの高さまで注水して3時間静置し、しかる後当該パイプ内の水を捨ててパイプ付き合板の重量を測定し、下式(II)により吸水率を求める。
吸水率(%)=〔(B−A)/A〕×100 (II)
但し、A:処理前の重量(g)
B:処理後の重量(g)
When a coating agent is applied to the end of a plate-like material conveyed continuously or intermittently by a feeding device using a coating device, the coating agent is 3 minutes according to the slump test of (1) below. A method for painting a plate-like object having a later fluidization width of 200 mm or less, a fluidization rate of 1.2 or less, and a coating film water absorption rate of 1.0% or less according to the following (2).
(1) Collect 100 ml of the liquid coating composition into a cylindrical container with an inner diameter of 50 mm, cover the opening of the container with a smooth surface plate such as a plastic plate, invert the container, and then immediately pull the container upward and pull it up. The spread diameter (mm) on the plate surface of the coating composition after 1 minute and 3 minutes was measured, the value after 3 minutes was taken as the fluidization width, and after 1 minute and 3 minutes according to the following formula (I) Let the ratio of the diameters be the fluidization rate. In the above, when the coating composition is a liquid at room temperature, it is measured in that state. When the coating composition is of a hot melt type, it is heated and used completely as a liquid, and the cylindrical container and the plate are 40 ° C. Measure using a sample kept warm.
Fluidization rate = Diameter after 3 minutes (mm) / Diameter after 1 minute (mm) (I)
(2) A paint composition (150 g / m 2 ) is uniformly applied to the surface of a 30 cm square plywood and dried at 120 ° C. for 3 minutes to produce a coated plywood. A 150mm transparent pipe is placed upright, and the lower end of the pipe is adhesively sealed to the painted plywood surface with an adhesive or the like. After curing for 7 days at room temperature, the weight of the plywood with pipe is measured, Water is then poured to a height of 50 mm and left to stand for 3 hours. After that, the water in the pipe is discarded, the weight of the plywood with the pipe is measured, and the water absorption is obtained by the following formula (II).
Water absorption rate (%) = [(B−A) / A] × 100 (II)
A: Weight before treatment (g)
B: Weight after treatment (g)
塗付装置が、塗付剤供給部材、塗付剤を塗付する部材および塗付剤をならい加圧する部材とを有し、かつ塗付剤供給部材から塗付剤を鉛直方向上部へ移動させる補助装置が該塗付剤を塗付する部材に付設されてなる請求項3に記載の板状物の木口塗装方法。The coating apparatus has a coating agent supply member, a member for applying the coating agent, and a member that pressurizes the coating agent, and moves the coating agent from the coating agent supply member upward in the vertical direction. The method for painting a plate-like object according to claim 3, wherein the auxiliary device is attached to a member to which the coating agent is applied. 塗付剤供給部材がシリンダー加圧による注入機であり、塗付剤を塗付する部材および塗付剤をならい加圧する部材が先端が収斂したナイフ状ないしはフイゴ状の形状を有することを特徴とする請求項3に記載の板状物の木口塗装方法。The coating agent supply member is an injection machine using cylinder pressurization, and the member to apply the coating agent and the member to pressurize following the coating agent have a knife-like or figo-like shape with a convergent tip. The method for painting a plate-like object according to claim 3. 塗付剤を塗付する部材および塗付剤をならい加圧する部材がエクストルーダーないしはカーテンコーターである請求項3に記載の板状物の木口塗装方法。The method for coating a plate-like object according to claim 3, wherein the member to which the coating agent is applied and the member to be pressed along with the coating agent are an extruder or a curtain coater. 塗付剤を塗付する部材がロール状であることを特徴とする請求項3または4に記載の板状物の木口塗装方法。The method of coating a plate-like object according to claim 3 or 4, wherein the member to which the coating agent is applied is in a roll shape. 塗付剤を塗付する部材がロール状であり、塗付剤をならい加圧する部材が板状またはロール状であり、かつ塗付装置が温度調整機能を有することを特徴とする請求項7に記載の板状物の木口塗装方法。The member to which the coating agent is applied is in a roll shape, the member to be pressurized following the coating agent is in a plate shape or a roll shape, and the coating device has a temperature adjusting function. A method for painting the mouth of the plate-like material described. 塗付剤を塗付する部材および塗付剤をならい加圧する部材がナイフ状の形状を有するブレードであり、かつ該ブレードが板状物の木口面と平行および/または平行かつ直角に設置されてなる請求項3に記載の板状物の木口塗装方法。The member to which the coating agent is applied and the member to be pressurized in accordance with the coating agent are blades having a knife-like shape, and the blades are installed in parallel and / or parallel and at right angles to the end of the plate-like object. The method for painting a plate-like object according to claim 3. 塗付剤を塗付する部材および塗付剤をならい加圧する部材が板状物の両木口面に平行して設置され、かつ塗付液が木口面に接触するように塗付液溜まりを有することを特徴とする請求項3に記載の板状物の木口塗装方法。A member to apply the coating agent and a member to pressurize following the coating agent are installed in parallel to the both ends of the plate-like material, and has a coating liquid reservoir so that the coating liquid comes into contact with the end of the plate. The method of painting a mouth of a plate-like object according to claim 3. 塗付剤を塗付する部材および塗付剤をならい加圧する部材が板状物の木口面に先端を近接させ得る単一もしくは複数の回転可能な翼であることを特徴とする請求項3に記載の板状物の木口塗装方法。The member for applying the coating agent and the member for applying the pressure by applying the coating agent are single or a plurality of rotatable wings whose tips can be brought close to the end face of the plate-like object. A method for painting the mouth of the plate-like material described. 塗付剤を塗付する部材および塗付剤をならい加圧する部材がギヤータイプで塗付剤の先入れ先出しを可能ならしめる供給装置を有することを特徴とする請求項3に記載の板状物の木口塗装方法。The plate mouthpiece according to claim 3, characterized in that the member for applying the coating agent and the member for pressurizing the coating agent are gear type and have a feeding device that enables first-in first-out of the coating agent. How to paint. 塗付剤を塗付する部材および塗布剤をならい加圧する部材とを有し、塗付剤を鉛直方向に移動させる補助装置が、1)円錐ロール状、あるいは2)ベベルギアー、ウォームギヤー構造のギヤー状および/またはロール状であり、これらを単独または二種以上を組み合わせて、塗付液を鉛直方向に移動させ、木口面に塗付剤を塗付することを特徴とする請求項1または2に記載の板状物の木口塗装方法。An auxiliary device that has a member for applying the coating agent and a member that pressurizes the coating agent in the vertical direction is 1) a conical roll, or 2) a gear with a bevel gear or a worm gear structure. The shape and / or roll shape, these are individual or combining 2 or more types, a coating liquid is moved to the orthogonal | vertical direction, and a coating agent is apply | coated to the end of a mouth. A method for painting the mouth of a plate-like material according to claim 1.
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