JPS6344026B2 - - Google Patents
Info
- Publication number
- JPS6344026B2 JPS6344026B2 JP56028660A JP2866081A JPS6344026B2 JP S6344026 B2 JPS6344026 B2 JP S6344026B2 JP 56028660 A JP56028660 A JP 56028660A JP 2866081 A JP2866081 A JP 2866081A JP S6344026 B2 JPS6344026 B2 JP S6344026B2
- Authority
- JP
- Japan
- Prior art keywords
- cylindrical body
- paint
- coating
- drying
- solvent
- 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.)
- Expired
Links
- 239000003973 paint Substances 0.000 claims description 41
- 239000011248 coating agent Substances 0.000 claims description 36
- 238000000576 coating method Methods 0.000 claims description 36
- 239000002904 solvent Substances 0.000 claims description 14
- 238000001035 drying Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 7
- 238000007664 blowing Methods 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 4
- 239000007921 spray Substances 0.000 description 6
- 238000001704 evaporation Methods 0.000 description 4
- 238000005187 foaming Methods 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 239000004593 Epoxy Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000007601 warm air drying Methods 0.000 description 1
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
Description
【発明の詳細な説明】
本発明は缶詰用の缶胴体の如き中空円筒体の内
面に溶剤を多量に含む液体塗料をスプレーし、所
望厚さの塗膜を形成する方法の改良に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a method for spraying a liquid paint containing a large amount of solvent onto the inner surface of a hollow cylindrical body such as a can body for cans to form a coating film of a desired thickness.
このような内面塗膜を形成するにあたり、従来
は、先づ、塗装機内で円筒体をその軸線のまわり
に回転させつつ、スプレー塗装し、塗装機から取
出したあと、乾燥焼付炉（以下、焼付炉という）
に運び入れ、静止状態（非回転状態）で乾燥（溶
剤を蒸発させる）、焼付けを行つて、目的とする
塗膜を得ている。しかし、ここでスプレー塗布さ
れる塗料は溶剤を多量に含有しており、液状であ
るから、円筒体が静止状態におかれたときに流下
するような量を塗布するとその流下により塗りム
ラを生ずるので、そういうことがないよう、一回
の塗布量は、円筒体が静止状態にあつてもその塗
料が円筒体内面に沿つて流下しない範囲の量に制
限されてしまい、従つて、薄く塗つて一旦焼付
け、その上に又薄く塗つては焼付けるように、塗
布→乾燥焼付けを何度か反覆して、円筒体が静止
状態におかれたとき、もし乾燥工程を経ていなけ
れば、流下を防止できない程度の塗布量で得られ
る厚みの塗膜（所望塗膜）を形成させているのが
現状である。 Conventionally, to form such an internal coating film, the cylindrical body was first spray-painted while rotating around its axis in a coating machine, and after being removed from the coating machine, it was heated in a drying baking oven (hereinafter referred to as baking oven). (called a furnace)
The target coating is obtained by drying (evaporating the solvent) and baking in a stationary (non-rotating) state. However, the paint sprayed here contains a large amount of solvent and is in liquid form, so if the amount applied is such that it flows down when the cylindrical body is in a stationary state, the flow will cause uneven coating. Therefore, to prevent this from happening, the amount of paint applied at one time is limited to an amount that does not flow down along the inner surface of the cylinder even when the cylinder is in a stationary state. When the cylinder is placed in a stationary state after repeating the process of coating and drying several times, such as once baking, applying a thin layer on top of the coating, and then baking it, if the cylinder has not gone through the drying process, it will not flow down. The current situation is to form a coating film (desired coating film) with a thickness that cannot be prevented.
もし、はじめから所望厚みの塗膜になるよう
に、厚く塗料を塗布し、乾燥（溶剤を蒸発させ
る）、焼付けが一回ですむようにすれば、工程は
簡単となり、燃料節約にもなることは明らかであ
る。そのためには静止状態で流下しないような粘
度の高い塗料を使用すればよいが、高粘度の塗料
（即ち、固形分含有率の高い塗料）はノズルから
の均一なスプレーがむずかしいので、スプレー塗
布の塗料としては用いられていない。 It is clear that if the paint could be applied thickly to get the desired thickness from the beginning, then dried (to evaporate the solvent) and baked only once, the process would be simpler and fuel would be saved. It is. To achieve this, it is best to use a paint with a high viscosity that does not flow down when it is stationary, but high viscosity paints (i.e. paints with a high solids content) are difficult to spray uniformly from the nozzle, so spray application is difficult. It is not used as a paint.
尤も、塗装機を出た後、焼付炉に至る間及び焼
付炉内において、塗布済円筒体を回転させるよう
にすれば、塗料の流下を防止し得るがしかし、そ
うするためには、焼付炉の構造が複雑となり、非
現実的である。そのため、今に到るも、従来の反
覆方式が踏襲されているのが実情である。 Of course, it is possible to prevent paint from flowing down by rotating the coated cylindrical body after it leaves the coating machine, before reaching the baking oven, and within the baking oven. The structure is complicated and unrealistic. Therefore, the current situation is that the conventional repetition method is still followed.
本発明は、塗布済円筒体を塗装機から取出した
後もなおその円筒体を回転させ続け、その間に、
その塗料を、円筒体が静止状態におかれても、流
下しない程度にまで乾燥（溶剤を蒸発）させた上
で、焼付炉に搬送することにより、上記の問題を
解決したものである。 The present invention continues to rotate the coated cylinder even after it is removed from the sprayer, while
The above problem was solved by drying the paint (evaporating the solvent) to the extent that it would not flow down even if the cylinder was kept stationary, and then transporting it to the baking oven.
即ち、本発明は、塗装機内で、中空円筒体を自
身の軸線のまわりに回転させながら、溶剤を多量
に含む液体塗料を該円筒体内面に仕上げ塗膜にな
る量だけスプレー塗装し、
該塗布終了後、塗布済円筒体の回転を実質的に
停止することなく、該円筒体を塗装機から取出
し、取り出した該円筒体を引き続き回転させなが
ら該円筒体内面に20〜60℃の温風を吹き付けて、
該円筒体内面の塗料中の溶剤の一部を蒸発させる
ことにより、該円筒体の回転を停止しても該塗料
が流下しない程度に該塗料を乾燥させてから、該
円筒体の回転を停止させた状態で該円筒体を搬送
して乾燥焼付炉に入れて該塗料を乾燥焼付けする
ことを特徴とする中空円筒体内面への塗膜形成法
を提供するものである。 That is, the present invention involves spraying a liquid paint containing a large amount of solvent onto the inner surface of the cylinder in an amount that will form a finishing film while rotating the hollow cylinder around its own axis in a coating machine. After finishing, the coated cylinder is taken out from the coating machine without substantially stopping its rotation, and hot air of 20 to 60°C is blown onto the inner surface of the cylinder while continuing to rotate the cylinder. Spray it,
By evaporating a part of the solvent in the paint on the inner surface of the cylindrical body, the paint is dried to the extent that the paint will not flow down even if the rotation of the cylindrical body is stopped, and then the rotation of the cylindrical body is stopped. The present invention provides a method for forming a coating film on the inner surface of a hollow cylindrical body, characterized in that the cylindrical body is conveyed in a drying state and placed in a drying and baking oven to dry and bake the paint.
以下、本発明方法の具体例を、第１図について
説明する。 A specific example of the method of the present invention will be described below with reference to FIG.
図中、Ａ，A1，A2，A3は有底中空円筒体、１
は塗装機１０における該円筒体の間欠移行路、
２，２′，３′は円筒体を支持する回転自在の支持
ロール、４は該回転自在ロール２′，３′と協力し
て円筒体を挾み、円筒体を自身の軸線のまわりに
回転させる平ベルト、５，５′は塗料塗布用スプ
レーノズル、６は塗布済の円筒体A3を塗装機１
０から受ける下方傾斜シユート、７は該傾斜シユ
ート上を転動降下する円筒体内面に向つて温風を
吹きつける温風吹きつけ部品である。 In the figure, A, A 1 , A 2 , A 3 are hollow cylinders with bottoms, 1
is an intermittent transition path of the cylindrical body in the coating machine 10,
2, 2', 3' are rotatable support rolls that support the cylindrical body; 4 cooperates with the rotatable rolls 2', 3' to sandwich the cylindrical body and rotate the cylindrical body around its own axis; 5 and 5' are spray nozzles for coating the paint, 6 is the coated cylindrical body A 3 , and the coating machine 1
A downwardly inclined chute 7 received from 0 is a hot air blowing component that blows hot air toward the inner surface of the cylindrical body that rolls down on the inclined chute.
第１図に示される装置において、先づ中空円筒
体Ａは、矢印ａの方向から下降して支持ロール
２，３（３は図示してない）によりその軸線が水
平になるように支持され、移行路１に沿つて間欠
前進を開始する。A1は間欠前進してノズル５と
対面する位置にきた円筒体であり、この円筒体
A1は支持ロール２′，３′と、走行している平ベ
ルト４とにより挾まれ、平ベルト４の走行により
自身の軸線のまわりに回転させられる。一方、ノ
ズル５は円筒体A1と対面したときにのみ溶剤を
多量に含む液体塗料を円筒体A1の内面に向つて
噴射（スプレー）するように制御される。次のノ
ズル５′に対応する位置（この位置での円筒体を
A2で示す）においても円筒体の内面に溶剤を多
量に含む液体塗料が塗布される。本例ではこれら
２ケ所で同じエポキシフエノール樹脂塗料を用
い、夫々塗布量を60mg／ｄcm2（乾燥時）とした。
円筒体は、ノズル５での塗布開始時から、ノズル
５′での塗布を経て、支持ロール２′から離れるま
での間、平ベルト４により回転させられつつ前進
する。円筒体は回転しているので、その内面に
ほゞ均一に塗料が塗布される。 In the apparatus shown in FIG. 1, a hollow cylindrical body A is first lowered in the direction of arrow a and supported by support rolls 2 and 3 (3 not shown) so that its axis is horizontal; Start intermittent forward movement along transition path 1. A 1 is a cylindrical body that has moved forward intermittently and has come to a position facing the nozzle 5;
A 1 is held between support rolls 2', 3' and a running flat belt 4, and is rotated around its own axis by the running of the flat belt 4. On the other hand, the nozzle 5 is controlled so as to inject (spray) the liquid paint containing a large amount of solvent toward the inner surface of the cylindrical body A 1 only when it faces the cylindrical body A 1 . The position corresponding to the next nozzle 5' (the cylinder at this position is
A 2 ) also applies a liquid paint containing a large amount of solvent to the inner surface of the cylinder. In this example, the same epoxy phenol resin paint was used at these two locations, and the coating amount was 60 mg/dcm 2 (dry) at each location.
The cylindrical body advances while being rotated by the flat belt 4 from the start of coating with the nozzle 5, through the coating with the nozzle 5', and until it leaves the support roll 2'. Since the cylinder is rotating, the paint is applied almost uniformly to its inner surface.
塗布済後の円筒体A3は支持ロールと平ベルト
とから離れ、塗装機１０を離脱し、予じめ設けら
れた傾斜シユート６上に落下するが、それまでの
回転による慣性により、平ベルトから離脱後も、
シユート上に落下するまで回転を停止することが
なく、また、傾斜シユート上を転動下降するとき
は、当然、回転し続けることになるので、何れに
せよ、塗布済後の円筒体A3が、塗装機１０を離
脱した直後、静止状態にあつたならば流下するよ
うな量の塗料を塗布した場合であつても、塗料の
流下は回避させる。この場合、回転速度は、塗料
の粘度や塗布量などの諸条件を勘案し、適宜の値
に定めればよい。例えば傾斜シユート上を転動降
下する円筒体の回転数を増減するためにその傾斜
角度を調整したり、或いは又、その回転速度を均
一にする手段として、該シユートとの間に円筒体
を挾むように他の平ベルトを設け、該ベルトで強
制的に転動させてもよい。これらは設計上の問題
である。 After coating, the cylindrical body A 3 separates from the support roll and the flat belt, leaves the coating machine 10, and falls onto the pre-installed inclined chute 6, but due to the inertia caused by the previous rotation, the flat belt Even after leaving the
It does not stop rotating until it falls onto the chute, and it naturally continues to rotate when rolling down the inclined chute, so in any case, the cylindrical body A3 after coating Immediately after leaving the coating machine 10, even if the paint is applied in an amount that would flow down if it were in a stationary state, the paint is prevented from flowing down. In this case, the rotational speed may be set to an appropriate value in consideration of various conditions such as the viscosity of the paint and the amount of coating. For example, the inclination angle of a cylindrical body rolling down on an inclined chute may be adjusted to increase or decrease its rotational speed, or the cylindrical body may be sandwiched between the chute and the chute as a means of making the rotational speed uniform. It is also possible to provide another flat belt so as to force the rotation. These are design issues.
円筒体A3が、上記シユート上を転動降下して
いる間に、その塗料を、円筒体を静止状態におい
たとしても流下しない程度に乾燥させるため、温
風吹きつけ部品７から、矢印ｂ方向に温風（60
℃）を５秒間吹きつけた。これにより液体塗料の
溶剤量の50％が蒸発した。次いでその円筒体を乾
燥焼付炉に搬入し、常法通り、缶底を上にして直
立させて搬送し塗料を乾燥し焼付けした。 While the cylindrical body A 3 is rolling down on the above-mentioned chute, in order to dry the paint to such an extent that it will not flow down even if the cylindrical body is kept stationary, hot air blowing part 7 blows the paint in the direction of arrow b. warm air (60
°C) for 5 seconds. This caused 50% of the solvent content of the liquid paint to evaporate. Next, the cylindrical body was carried into a drying and baking oven, and the paint was dried and baked by transporting it upright with the bottom of the can facing up, as usual.
そのあとで、塗膜のムラ、発泡の有無を検査し
たが、ムラは認められず、又発泡個所もなかつ
た。 Thereafter, the coating film was inspected for unevenness and foaming, but no unevenness was observed and no foaming was observed.
尚本例に用いた円筒体は、ドーム形の底壁をも
つものであつたので、特に底壁に附着した塗料の
溶剤の少なくとも50％を蒸発させるように、底壁
附近には、上記温風を風速0.5〜1.5ｍ／秒位の速
さで流した。 Since the cylindrical body used in this example had a dome-shaped bottom wall, the above-mentioned temperature was applied near the bottom wall to evaporate at least 50% of the solvent in the paint attached to the bottom wall. The wind was flowed at a speed of about 0.5 to 1.5 m/sec.
底壁が平坦な円筒体についての実験では、塗膜
量を100mg／ｄcm2（乾燥時）とし、温風による乾
燥を、塗料の流下が停止するまで（この場合の溶
剤量の蒸発は50％をはるかに下まわる）行つてか
ら、乾燥焼付けを行つたが、この場合も良好な塗
膜が形成された。 In an experiment on a cylindrical body with a flat bottom wall, the coating amount was 100 mg/dcm 2 (dry), and drying with hot air was continued until the paint stopped flowing (in this case, the evaporation of the solvent amount was 50%). After dry baking, a good film was formed.
さらに上記の２つの例において夫々、温風温度
を20℃とし吹きつけを20秒としたが、何れにおい
ても良好な塗膜が得られた。 Furthermore, in each of the above two examples, the hot air temperature was 20° C. and the blowing time was 20 seconds, but good coating films were obtained in both cases.
言うまでもないが、上記温風乾燥によつて、も
はや静止状態にあつても流下しない程度に塗料が
乾燥されたならば、もはや円筒体を回転させる要
はなくなるから、円筒体の回転は、そういう乾燥
状況になるまでの間保持されゝば充分である。 Needless to say, once the paint has been dried to the extent that it will not flow down even when it is in a stationary state through the warm air drying described above, there is no longer any need to rotate the cylindrical body, so rotation of the cylindrical body is It is sufficient if it is maintained until the situation arises.
以上、本発明によるときは、静止状態においた
ならば流下を防止できない程度の塗布量を、円筒
体に適用した場合であつても、塗装機から離脱後
も尚、該塗布済円筒体を回転状態に維持してその
塗料の流下を防ぎ、且つ、その間に、静止状態に
おいたとしても流下しない程度に該塗料を乾燥さ
せてから、焼付炉に搬入するので、仕上り品にお
ける塗料のムラは発生せず、又発泡現象もなく、
さらに、円筒体内面に、はじめから所望厚の塗膜
を形成するに足る量の塗料を適用しておくことが
できるから、焼付炉での作業を一度ですませるこ
とができ、また焼付炉内ではもはや円筒体を回転
させる要がないから、従来の炉をそのまゝ利用で
きる、など、幾多の効果が得られる。 As described above, according to the present invention, even when a coating amount is applied to a cylindrical body to the extent that it would not be possible to prevent the coating from flowing down if the cylindrical body is kept stationary, the coated cylindrical body can still be rotated even after being removed from the spray machine. The paint is maintained in a stable condition to prevent the paint from flowing down, and during this time the paint is dried to the extent that it will not flow even if it is kept stationary before being transported to the baking oven, so there will be no unevenness in the paint on the finished product. There is no foaming phenomenon.
Furthermore, since enough paint can be applied to the inner surface of the cylindrical body from the beginning to form a coating film of the desired thickness, the work in the baking oven can be done only once; Since there is no need to rotate the cylindrical body, many advantages can be obtained, such as the ability to use conventional furnaces as they are.
第１図は本発明方法の説明図である。
Ａ，A1〜A3……中空円筒体、１……中空円筒
体の移行路、４……平ベルト、５……ノズル、６
……傾斜シユート、７……温風吹きつけ部品。
FIG. 1 is an explanatory diagram of the method of the present invention. A, A1 to A3 ...Hollow cylindrical body, 1...Transition path of hollow cylindrical body, 4...Flat belt, 5...Nozzle, 6
... Inclined chute, 7... Hot air blowing parts.
Claims (1)
りに回転させながら、溶剤を多量に含む液体塗料
を該円筒体内面に仕上げ塗膜になる量だけスプレ
ー塗布する工程、 該塗布終了後、塗布済円筒体の回転を実質的に
停止することなく、該円筒体を塗装機から取出す
工程、 取り出した該円筒体を引き続き回転させながら
該円筒体内面に20〜60℃の温風を吹き付けて、該
円筒体内面の塗料中の溶剤の一部を蒸発させるこ
とにより、該円筒体の回転を停止しても該塗料が
流下しない程度に該塗料を乾燥させる工程、及び 該円筒体の回転を停止させた状態で該円筒体を
搬送して乾燥焼付炉に入れて該塗料を乾燥焼付け
する工程 からなることを特徴とする中空円筒体内面への塗
膜形成法。 ２ 塗料のスプレー塗装を２回に分けて行う特許
請求の範囲第１項記載の方法。[Scope of Claims] 1. Spraying a liquid paint containing a large amount of solvent onto the inner surface of the cylinder in an amount that will form a final coating while rotating the hollow cylinder around its own axis in a coating machine; After the coating is completed, the cylindrical body is taken out from the coating machine without substantially stopping the rotation of the cylindrical body, and the inner surface of the cylindrical body is heated to a temperature of 20 to 60°C while the cylindrical body is continued to be rotated. a step of blowing hot air to evaporate a portion of the solvent in the paint on the inner surface of the cylindrical body to dry the paint to the extent that the paint will not flow down even if the rotation of the cylindrical body is stopped; A method for forming a coating film on the inner surface of a hollow cylindrical body, comprising the steps of transporting the cylindrical body while stopping rotation of the cylindrical body, placing the cylindrical body in a drying and baking oven, and drying and baking the paint. 2. The method according to claim 1, wherein the spray coating of the paint is carried out in two steps.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2866081A JPS57144069A (en) | 1981-02-28 | 1981-02-28 | Painted film forming method inside of hollow cylindrical body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2866081A JPS57144069A (en) | 1981-02-28 | 1981-02-28 | Painted film forming method inside of hollow cylindrical body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57144069A JPS57144069A (en) | 1982-09-06 |
| JPS6344026B2 true JPS6344026B2 (en) | 1988-09-02 |
Family
ID=12254650
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2866081A Granted JPS57144069A (en) | 1981-02-28 | 1981-02-28 | Painted film forming method inside of hollow cylindrical body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57144069A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6022970A (en) * | 1983-07-15 | 1985-02-05 | Toyo Seikan Kaisha Ltd | Painting method of inside surface of 2-piece can |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2103270A (en) * | 1934-10-30 | 1937-12-28 | American Can Co | Can spraying machine |
| JPS4860728A (en) * | 1971-12-03 | 1973-08-25 | ||
| JPS5528726A (en) * | 1978-08-22 | 1980-02-29 | Toyo Seikan Kaisha Ltd | Continuous painting method and line of metal blank for can |
-
1981
- 1981-02-28 JP JP2866081A patent/JPS57144069A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2103270A (en) * | 1934-10-30 | 1937-12-28 | American Can Co | Can spraying machine |
| JPS4860728A (en) * | 1971-12-03 | 1973-08-25 | ||
| JPS5528726A (en) * | 1978-08-22 | 1980-02-29 | Toyo Seikan Kaisha Ltd | Continuous painting method and line of metal blank for can |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57144069A (en) | 1982-09-06 |
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