JPH0725909B2 - Corona discharge treatment method - Google Patents
Corona discharge treatment methodInfo
- Publication number
- JPH0725909B2 JPH0725909B2 JP2185596A JP18559690A JPH0725909B2 JP H0725909 B2 JPH0725909 B2 JP H0725909B2 JP 2185596 A JP2185596 A JP 2185596A JP 18559690 A JP18559690 A JP 18559690A JP H0725909 B2 JPH0725909 B2 JP H0725909B2
- Authority
- JP
- Japan
- Prior art keywords
- molded product
- corona discharge
- electrodes
- discharge treatment
- resin molded
- 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 - Lifetime
Links
- 238000003851 corona treatment Methods 0.000 title claims description 21
- 238000000034 method Methods 0.000 title claims description 20
- 229920005989 resin Polymers 0.000 claims description 32
- 239000011347 resin Substances 0.000 claims description 32
- 230000004913 activation Effects 0.000 claims description 17
- 208000028659 discharge Diseases 0.000 claims description 17
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 6
- 238000000465 moulding Methods 0.000 claims description 6
- 238000000576 coating method Methods 0.000 description 11
- 239000011248 coating agent Substances 0.000 description 10
- UOCLXMDMGBRAIB-UHFFFAOYSA-N 1,1,1-trichloroethane Chemical compound CC(Cl)(Cl)Cl UOCLXMDMGBRAIB-UHFFFAOYSA-N 0.000 description 7
- 230000002950 deficient Effects 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 238000001514 detection method Methods 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 229920005672 polyolefin resin Polymers 0.000 description 2
- -1 polypropylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 239000012086 standard solution Substances 0.000 description 2
- 229920002725 thermoplastic elastomer Polymers 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Landscapes
- Treatments Of Macromolecular Shaped Articles (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、例えばポリプロピレン等のポリオレフィン系
樹脂からなる樹脂成形品の表面を活性化させるためのコ
ロナ放電処理方法に関するものである。TECHNICAL FIELD The present invention relates to a corona discharge treatment method for activating the surface of a resin molded product made of a polyolefin resin such as polypropylene.
［従来の技術］ 一般に、ポリプロピレン等のポリオレフィン系樹脂は極
性基が少ないので、同樹脂からなる成形品の表面には塗
料、接着剤、印刷剤等が付着しにくい。そのため、前記
樹脂成形品の表面に塗装等を行う場合には、その前処理
としてコロナ放電処理を施して表面を活性化させ、付着
性を向上させている。[Prior Art] Generally, a polyolefin resin such as polypropylene has a small number of polar groups, and therefore a paint, an adhesive, a printing agent or the like is unlikely to adhere to the surface of a molded article made of the resin. Therefore, when coating or the like is applied to the surface of the resin molded product, corona discharge treatment is performed as a pretreatment to activate the surface and improve the adhesion.
このコロナ放電処理は、対向配置された一対の電極と、
両電極間に配設された搬送手段（例えば、ベルトコンベ
ア）とを備えた処理槽内で行われる。すなわち、搬送手
段で樹脂成形品を搬送しながら、両電極間に高電圧を印
加してコロナ放電を発生させ、そのコロナ放電により生
成したオゾンで樹脂成形品の表面を活性化させるもので
ある。This corona discharge treatment includes a pair of electrodes that are arranged to face each other,
It is carried out in a processing tank provided with a conveying means (for example, a belt conveyor) arranged between both electrodes. That is, while the resin molded product is being transported by the transport means, a high voltage is applied between both electrodes to generate corona discharge, and the ozone generated by the corona discharge activates the surface of the resin molded product.
この方法では、コロナ放電処理中に樹脂成形品の表面が
十分に活性化されたか否かを確認できない。そのため、
処理後に同表面に水等の液体を垂らしてその接触角を測
定したり、樹脂成形品の表面に濡れ指数標準液を塗布
し、その塗布面における液ぎれ状態を観察したりして、
樹脂成形品表面の活性化度を判定している。これらの方
法は樹脂成形品の表面が活性化されると、その表面張力
が変化することに着目したものである。また、コロナ放
電処理時における放電状態を目視し、放電の色で活性化
の程度をおおまかに判断する方法もある。With this method, it cannot be confirmed whether or not the surface of the resin molded product was sufficiently activated during the corona discharge treatment. for that reason,
After the treatment, dripping a liquid such as water on the surface to measure the contact angle, or applying a wetting index standard liquid to the surface of the resin molded product, and observing the liquid-drained state on the coated surface,
The degree of activation of the surface of the resin molded product is judged. These methods focus on the fact that when the surface of a resin molded product is activated, its surface tension changes. There is also a method of visually observing the discharge state during the corona discharge treatment and roughly determining the degree of activation by the color of the discharge.
［発明が解決しようとする課題］ ところが、前記した接触角を測定する方法や指数標準液
の液ぎれを観察する方法は、いずれもコロナ放電処理後
に行うものであり、その性格上、コロナ放電処理時の不
良発生を防止することはできない。また、放電の色で活
性化の程度を見る方法は、大まかな判定を行うことはで
きるが正確さに欠ける。そのため、コロナ放電処理中に
樹脂成形品表面の活性化の程度を正確に把握し、表面活
性化が不十分な場合には不良品が発生したと判断できる
方法の出現が期待されている。[Problems to be Solved by the Invention] However, the methods for measuring the contact angle and the method for observing the liquid breakage of the exponential standard solution are both performed after the corona discharge treatment. Occurrence of defects cannot be prevented. Further, the method of observing the degree of activation by the color of discharge can make a rough judgment but lacks accuracy. Therefore, it is expected that a method that accurately grasps the degree of activation of the surface of the resin molded product during the corona discharge treatment and can judge that a defective product has occurred when the surface activation is insufficient.
本発明は上述したような事情に鑑みてなされたものであ
り、その目的は樹脂成形品の表面が十分に活性化されな
かったことに起因する不良品の発生を未然に防止するこ
とができるコロナ放電処理方法を提供することにある。The present invention has been made in view of the above-mentioned circumstances, and its object is to prevent the occurrence of defective products due to insufficient activation of the surface of the resin molded product. It is to provide an electric discharge treatment method.
［課題を解決するための手段］ 本発明者は両電極間の輝度と、樹脂成形品が両電極間を
通過するのに要する時間との関係について実験を行った
結果、両者の積が小さくなる程、樹脂成形品の表面活性
度が低下することを見出した。[Means for Solving the Problem] The present inventor has conducted an experiment on the relationship between the luminance between both electrodes and the time required for a resin molded product to pass between the two electrodes, and as a result, the product of the two becomes small. It was found that the degree of surface activity of the resin molded product is lowered.
そこで、本発明は対向配置された一対の電極間に高電圧
を印加してコロナ放電を発生させるとともに、搬送手段
にて樹脂成形品を搬送して両電極間を通過させ、前記コ
ロナ放電により生成したオゾンで樹脂成形品の表面を活
性化させるようにしたコロナ放電処理方法において、前
記両電極間の輝度と、樹脂成形品が両電極間を通過する
のに要する時間との積が予め設定された値よりも小さく
なったとき、樹脂成形品の表面活性化が不十分として、
両電極間の電圧印加及び樹脂成形品の搬送を停止させる
ようにしたコロナ放電処理方法をその要旨とするもので
ある。Therefore, according to the present invention, a high voltage is applied between a pair of electrodes arranged to face each other to generate corona discharge, and a resin molding product is conveyed by a conveying means to pass between both electrodes to generate corona discharge. In the corona discharge treatment method in which the surface of the resin molded product is activated by the ozone, the product of the luminance between the electrodes and the time required for the resin molded product to pass between the electrodes is set in advance. When the value becomes smaller than the above value, it is considered that the surface activation of the resin molded product is insufficient,
The gist is a corona discharge treatment method in which the voltage application between both electrodes and the conveyance of a resin molded product are stopped.
［作用］ 一対の電極間に高電圧が印加されコロナ放電が発生する
と、このコロナ放電によってオゾンが生成する。この
際、オゾンが樹脂成形品表面の分子と結合して例えばカ
ルボニル基が生成され、樹脂成形品の表面を活性化させ
る。そして、コロナ放電中の両電極間の輝度と、樹脂成
形品が両電極間を通過するのに要する時間との積が予め
設定された値よりも小さくなったとき、樹脂成形品の表
面活性化が不十分として、両電極間の電圧印加及び樹脂
成形品の搬送が停止される。[Operation] When a high voltage is applied between the pair of electrodes to generate corona discharge, ozone is generated by the corona discharge. At this time, ozone bonds with molecules on the surface of the resin molded product to generate, for example, a carbonyl group, and activates the surface of the resin molded product. Then, when the product of the brightness between both electrodes during corona discharge and the time required for the resin molded product to pass between both electrodes becomes smaller than a preset value, surface activation of the resin molded product is performed. Is insufficient, voltage application between both electrodes and conveyance of the resin molded product are stopped.
［実施例］ 以下、本発明を具体化した一実施例を図面に基づいて説
明する。本実施例では、自動車用マッドガードの製造工
程の一つである、射出成形工程を経て形成された未塗装
の多数の中間成形品６を樹脂成形品とし、これらの中間
成形品６の塗装に先立ちコロナ放電処理が施されるもの
とする。この中間成形品６は、ポリオレフィン系サーモ
プラスチックエラストマー（TPE）よりなるものであ
る。[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. In this embodiment, a large number of unpainted intermediate molded products 6 formed through the injection molding process, which is one of the manufacturing processes for automobile mudguards, are resin molded products, and prior to coating these intermediate molded products 6. Corona discharge treatment shall be applied. The intermediate molded product 6 is made of a polyolefin-based thermoplastic elastomer (TPE).
第１図は本実施例のコロナ放電処理を行うための処理装
置の構成を示す図である。この処理装置の処理槽１は前
後（図の左右）両面が開放されており、後側の開放部分
に木製の遮蔽板1aが開閉可能に取付けられている。ま
た、前記処理槽１内には、モータＭにより周回駆動され
る搬送手段としてのベルトコンベア２が配設されてい
る。FIG. 1 is a view showing the arrangement of a processing apparatus for performing corona discharge processing according to this embodiment. The front and rear (left and right in the drawing) both sides of the processing tank 1 of this processing apparatus are open, and a wooden shield plate 1a is openably and closably attached to the rear open part. Further, in the processing tank 1, a belt conveyor 2 is arranged as a conveying means which is driven to rotate by a motor M.
モータＭとこれに電力を供給する電源３との間には、第
１スイッチ５が接続されている。第１スイッチ５は、マ
イコンを内蔵したコントローラ４の出力側に接続されて
おり、同コントローラ４からの制御信号によってこの第
１スイッチ５が閉じられるとモータＭが作動し、ベルト
コンベア２のベルト2aが矢印Ａ方向へ周回される。その
ため、処理槽１の後側開放部分からベルト2a上に中間成
形品６が供給されると、この中間成形品６はベルト2aの
周回によって前方へ搬送される。A first switch 5 is connected between the motor M and a power supply 3 that supplies electric power to the motor M. The first switch 5 is connected to the output side of a controller 4 having a built-in microcomputer. When the first switch 5 is closed by a control signal from the controller 4, the motor M is activated and the belt 2a of the belt conveyor 2 is driven. Circles in the direction of arrow A. Therefore, when the intermediate molded product 6 is supplied onto the belt 2a from the rear open portion of the processing tank 1, the intermediate molded product 6 is conveyed forward by the circulation of the belt 2a.
処理槽１内においてベルトコンベア２の上下には一対の
電極7,8が対向配置されており、両電極7,8には電源９
と、高圧トランス（図示しない）と、第２スイッチ10と
が接続されている。第２スイッチ10は前記コントローラ
４の出力側に接続されており、同コントローラ４からの
制御信号によってこの第２スイッチ10が閉じられると、
両電極7,8間に高電圧が印加されてコロナ放電が発生
し、オゾン（O3）が生成するようになっている。In the processing tank 1, a pair of electrodes 7 and 8 are arranged facing each other above and below the belt conveyor 2, and a power source 9 is provided to both electrodes 7 and 8.
The high voltage transformer (not shown) and the second switch 10 are connected to each other. The second switch 10 is connected to the output side of the controller 4, and when the second switch 10 is closed by a control signal from the controller 4,
A high voltage is applied between both electrodes 7 and 8, corona discharge is generated, and ozone (O 3 ) is generated.
前記処理槽１内の前部には、輝度計（東京光学機械株式
会社製 LUMINANCE METER BM−５）11が取付けられてい
る。この輝度計11の焦点は前記遮蔽板1a内面の木目に合
わせられており、この状態で輝度計11により両電極7,8
間の輝度Ｃ（cd/m2）が検出される。また、前記ベルト
コンベア２の近傍位置には、そのベルト2aの周回速度Ｓ
（m/分）を検出するための速度検出センサ12が配設され
ている。これらの輝度計11及び速度検出センサ12は前記
コントローラ４の入力側に接続されている。なお、コン
トローラ４の出力側には輝度計11によって検出されたそ
の時々の両電極7,8間の輝度Ｃを表示する表示器13が接
続されている。A luminance meter (LUMINANCE METER BM-5, manufactured by Tokyo Optical Machine Co., Ltd.) 11 is attached to the front part of the processing tank 1. The focus of the luminance meter 11 is aligned with the grain of the inner surface of the shielding plate 1a, and in this state, both electrodes 7, 8 are
The luminance C (cd / m 2 ) between them is detected. In addition, in the vicinity of the belt conveyor 2, the revolving speed S of the belt 2a is
A speed detection sensor 12 for detecting (m / min) is provided. The luminance meter 11 and the speed detection sensor 12 are connected to the input side of the controller 4. A display device 13 is connected to the output side of the controller 4 to display the brightness C between the electrodes 7 and 8 at each time detected by the brightness meter 11.
コントローラ４に内蔵されたメモリには、ベルトコンベ
ア２のベルト2aの周回速度Ｓ毎に、同ベルト2a上の中間
成形品６が両電極7,8間を通過するのに要する時間（以
後、通過時間という）Ｔが関係付けられて記憶されてい
る。すなわち、ベルトコンベア２の前後長さをｌとする
と、Ｔ＝l/Sの関係式で求められる通過時間Ｔが周回速
度Ｓ毎に記憶されている。In the memory built in the controller 4, the time required for the intermediate molded product 6 on the belt 2a to pass between the electrodes 7 and 8 for each orbiting speed S of the belt 2a of the belt conveyor 2 The time T is associated and stored. That is, assuming that the front-rear length of the belt conveyor 2 is 1, the passage time T obtained by the relational expression T = 1 / S is stored for each orbital speed S.
このコントローラ４は輝度計11により検出された輝度Ｃ
（cd/m2）と、速度検出センサ12により検出された周回
速度Ｓ（m/分）に対応する通過時間Ｔ（分）との積を算
出する。そして、コントローラ４は算出された値と予め
設定された設定値Ｂとを比較し、前者の算出値が後者の
設定値Ｂ以上である場合には、前記両スイッチ5,10を閉
じ、算出値が設定値Ｂよりも小さい場合には、両スイッ
チ5,10を開いて両電極7,8間への電圧印加及びベルトコ
ンベア２の周回駆動を停止させるようになっている。な
お、本実施例における前記設定値Ｂは0.04cd/m2・分で
あり、この設定値Ｂは後記する実験結果に基づき決定し
た値である。This controller 4 has a brightness C detected by a brightness meter 11.
The product of (cd / m 2 ) and the passage time T (minutes) corresponding to the orbital speed S (m / minute) detected by the speed detection sensor 12 is calculated. Then, the controller 4 compares the calculated value with a preset setting value B, and when the former calculated value is equal to or larger than the latter set value B, both the switches 5 and 10 are closed to calculate the calculated value. Is smaller than the set value B, both switches 5 and 10 are opened to stop the voltage application between the electrodes 7 and 8 and the circulatory drive of the belt conveyor 2. The set value B in this embodiment is 0.04 cd / m 2 · min, and the set value B is a value determined based on the experimental results described later.
次に、前記処理装置を用いて中間成形品６の表面にコロ
ナ放電処理を施す方法について説明する。Next, a method of subjecting the surface of the intermediate molded product 6 to corona discharge treatment using the above-mentioned processing apparatus will be described.
まず、中間成形品６の表面に確実にコロナ放電処理が行
われるように、同中間成形品６をトリクロロエタンで洗
浄する前処理を行う。このときの洗浄方法としては、
トリクロロエタンの蒸気（約74℃）中に中間成形品６を
所定時間（約20秒間）放置する方法、温められたトリ
クロロエタンを中間成形品６に所定時間（約20秒間）吹
き付ける方法、トリクロロエタンの蒸気（約74℃）中
に中間成形品６を所定時間（約20秒間）放置した後、温
められたトリクロロエタンを中間成形品６に所定時間
（約20秒間）吹き付ける方法がある。前記トリクロロエ
タンによる洗浄が終わったら、中間成形品６を乾燥（90
℃×15分）し、付着しているトリクロロエタンを蒸発さ
せる。First, a pretreatment of washing the intermediate molded product 6 with trichloroethane is performed so that the surface of the intermediate molded product 6 is surely subjected to corona discharge treatment. As a cleaning method at this time,
Method of leaving the intermediate molded product 6 in the steam of trichloroethane (about 74 ° C.) for a predetermined time (about 20 seconds), spraying warmed trichloroethane onto the intermediate molded product 6 for a predetermined time (about 20 seconds), steam of trichloroethane ( There is a method in which the intermediate molded product 6 is allowed to stand for a predetermined time (about 20 seconds) in about 74 ° C., and then warmed trichloroethane is sprayed onto the intermediate molded product 6 for a predetermined time (about 20 seconds). After washing with the trichloroethane, dry the intermediate molded product 6 (90
(° C x 15 minutes) and evaporate the attached trichloroethane.
次に、前記中間成形品６を処理装置に投入する。そし
て、処理装置のスタートスイッチ（図示しない）がオン
操作されると、コントローラ４は第１スイッチ５及び第
２スイッチ10を閉じるための制御信号を出力する。この
制御信号に基づき両スイッチ5,10が閉じられると、ベル
トコンベア２が周回駆動されるとともに、両電極7,8間
に高電圧が印加される。前記電圧印加により両電極7,8
間でコロナ放電が発生し、これにともないオゾンが生成
する。このとき、オゾンが中間成形品６表面の分子と結
合して例えばカルボニル基が生成され、同中間成形品６
の表面が活性化される。Next, the intermediate molded product 6 is loaded into the processing device. Then, when a start switch (not shown) of the processing device is turned on, the controller 4 outputs a control signal for closing the first switch 5 and the second switch 10. When both switches 5 and 10 are closed based on this control signal, the belt conveyor 2 is orbitally driven and a high voltage is applied between both electrodes 7 and 8. Both electrodes 7,8 by applying the voltage
Corona discharge occurs between the two and ozone is generated with it. At this time, ozone bonds with molecules on the surface of the intermediate molded product 6 to generate, for example, a carbonyl group, and the intermediate molded product 6
The surface of is activated.
前記処理装置の作動時には、両電極7,8間の輝度Ｃが輝
度計11にて検出されるとともに、ベルトコンベア２のベ
ルト2aの周回速度Ｓが速度検出センサ12にて検出され
る。コントローラ４は、検出されたその時々の輝度Ｃ及
び周回速度Ｓを取り込み、その周回速度Ｓに対応する通
過時間Ｔと輝度Ｃとの積を算出する。そして、前記のよ
うに算出された値と、設定値Ｂ（この場合0.04cd/m2・
分）とを比較する。このとき、算出値が設定値Ｂ以上で
あれば前記両スイッチ5,10を閉状態に保持する。When the processing device is operating, the luminance C between the electrodes 7 and 8 is detected by the luminance meter 11, and the orbital speed S of the belt 2a of the belt conveyor 2 is detected by the speed detection sensor 12. The controller 4 takes in the detected brightness C and the orbiting speed S at each time, and calculates the product of the passing time T corresponding to the orbiting speed S and the brightness C. Then, the value calculated as described above and the set value B (0.04 cd / m 2 ·
Min). At this time, if the calculated value is greater than or equal to the set value B, both switches 5 and 10 are held in the closed state.
ところで、何らかの原因によりベルトコンベア２のベル
ト2aの周回速度Ｓが低下したり、輝度Ｃが減少したりし
て、この輝度Ｃと、中間成形品６の通過時間Ｔとの積が
設定値Ｂ（0.04cd/m2・分）よりも小さくなると、中間
成形品６の表面活性化が不十分として、コントローラ４
は第１スイッチ５及び第２スイッチ10を開くための制御
信号を出力する。これらの両スイッチ5,10が開かれる
と、両電極7,8間への電圧印加及びベルトコンベア２の
周回が停止される。このため、処理装置の作動が自動的
に停止され、不良品の発生が未然に防止される。By the way, the circulating speed S of the belt 2a of the belt conveyor 2 is lowered or the brightness C is decreased for some reason, and the product of the brightness C and the passage time T of the intermediate molded product 6 is a set value B ( If it is smaller than 0.04 cd / m 2 · min), the surface activation of the intermediate molded product 6 is insufficient and the controller 4
Outputs a control signal for opening the first switch 5 and the second switch 10. When both switches 5 and 10 are opened, the voltage application between the electrodes 7 and 8 and the circulation of the belt conveyor 2 are stopped. Therefore, the operation of the processing device is automatically stopped, and the generation of defective products is prevented.
なお、前記コロナ放電処理が正常に行われた中間成形品
６は、塗装工程へ移行される。この工程で中間成形品６
にアクリルウレタン系の塗料が塗布され、室温で約10分
放置された後、85℃で30分間反応硬化される。すると、
中間成形品６の表面に塗膜が形成される。The intermediate molded product 6 that has been normally subjected to the corona discharge treatment is transferred to the coating process. Intermediate molded product 6 in this process
Acrylic urethane-based paint is applied to the product, left at room temperature for about 10 minutes, and then cured at 85 ° C for 30 minutes. Then,
A coating film is formed on the surface of the intermediate molded product 6.
ここで、（輝度Ｃ）×（通過時間Ｔ）と、中間成形品６
表面の活性化度との関係について実験を行った。その結
果を表−１に示す。この実験では中間成形品６表面の活
性化度として、同表面に対する塗膜の密着性を調べた。
この密着性試験は塗膜に碁盤の目状に切り込みを入れて
100個の塗膜片を形成し、これに工業用テープを貼着
し、その後同テープを剥がしたときに、中間成形品６か
ら剥離する塗膜片の数を数えるものである。また、表−
１には参考までに、コロナ放電処理が行われた中間成形
品６の表面に水滴を垂らしたときの接触角（゜）も併記
した。Here, (luminance C) × (passing time T) and the intermediate molded product 6
Experiments were conducted on the relationship with the degree of surface activation. The results are shown in Table-1. In this experiment, as the degree of activation of the surface of the intermediate molded product 6, the adhesion of the coating film to the surface was examined.
For this adhesion test, make a notch in a grid pattern on the coating film.
When 100 coating film pieces are formed, an industrial tape is adhered to this, and then the tape is peeled off, the number of coating film pieces peeled from the intermediate molded product 6 is counted. Also, the table −
For reference, 1 also shows the contact angle (°) when a water drop is dripped on the surface of the intermediate molded product 6 that has been subjected to corona discharge treatment.
表−１から明らかなように、通過時間Ｔと輝度Ｃとの積
が0.04cd/m2・分よりも大きい場合には、塗膜片が全く
剥がれないのに対し、同積が0.04cd/m2・分以下では塗
膜片が剥がれてしまった。これは、通過時間Ｔと輝度Ｃ
との積が0.04cd/m2・分以下では、中間成形品６の表面
が十分なレベルまで活性化されていないからである。従
って、前記通過時間Ｔと輝度Ｃとの積で、コロナ放電処
理による中間成形品６表面の活性化度を正確に把握する
ことができる。 As is clear from Table-1, when the product of the transit time T and the brightness C is larger than 0.04 cd / m 2 · min, the coating film piece is not peeled at all, whereas the product is 0.04 cd / m 2. At m 2 / min or less, the coating film pieces peeled off. This is the transit time T and the brightness C
This is because the surface of the intermediate molded product 6 is not activated to a sufficient level when the product of and is 0.04 cd / m 2 · min or less. Therefore, the product of the passage time T and the brightness C can accurately grasp the degree of activation of the surface of the intermediate molded product 6 by the corona discharge treatment.
このように本実施例によれば、通過時間Ｔと輝度Ｃとの
積で中間成形品６の表面が十分に活性化されたか否かを
処理中に判定でき、十分に活性化されていない場合に
は、両電極7,8間への電圧印加及び中間成形品６の搬送
を停止させるようにしたので、活性化が十分に行われな
かったことに起因する不良品の発生を未然に防止するこ
とができる。そのため、従来技術における、コロナ放電
処理後に水滴等の接触角を測定したり指数標準液の液ぎ
れ状態を観察したりするという活性化の程度を確認する
作業が不要となった。As described above, according to the present embodiment, it is possible to determine during processing whether the surface of the intermediate molded product 6 has been sufficiently activated by the product of the passage time T and the brightness C, and when it is not sufficiently activated. In this case, since the voltage application between both electrodes 7 and 8 and the conveyance of the intermediate molded product 6 are stopped, the generation of defective products due to insufficient activation is prevented. be able to. Therefore, in the prior art, the work of confirming the degree of activation, such as measuring the contact angle of water droplets or the like after the corona discharge treatment and observing the liquid drop state of the index standard liquid, becomes unnecessary.
なお、前記実施例では両電極7,8間への電圧印加及びベ
ルトコンベア２の駆動を停止させるときの下限の値のみ
を設定したが、上限値も併せて設定してもよい。前記表
−１と同様の実験を行った結果、輝度Ｃと通過時間Ｔの
積の好ましい上限値は2.0cd/m2・分であり、50cd/m2・
分を越えると、塗膜表面が老化するおそれがあることが
分かった。このことから、上限の設定値を50cd/m2・分
とし、前記積が0.04〜50cd/m2・分の範囲から外れたと
きに、両電極7,8間への電圧印加及びベルトコンベア２
の駆動を停止させるようにすれば、不良品の発生をさら
に確実に防止できる。In the above embodiment, only the lower limit value for stopping the voltage application between the electrodes 7 and 8 and the driving of the belt conveyor 2 is set, but the upper limit value may be set together. As a result of performing the same experiment as in Table 1, the preferable upper limit of the product of the brightness C and the passage time T is 2.0 cd / m 2 · min, and 50 cd / m 2 ·
It has been found that if the amount exceeds the limit, the coating film surface may be aged. From this, when the upper limit setting value is set to 50 cd / m 2 · min and the product deviates from the range of 0.04 to 50 cd / m 2 · min, voltage application between both electrodes 7 and 8 and the belt conveyor 2
By stopping the driving of, it is possible to more reliably prevent the occurrence of defective products.
また、本発明は前記マッドガード以外にも、自動車用バ
ンパ、自動車用モール等の、成形後に塗装、接着、印刷
等が必要な樹脂成形品を対象物とすることができる。In addition to the mudguard, the present invention can also be applied to resin molded articles such as automobile bumpers and automobile moldings that require painting, bonding, printing, etc. after molding.
さらに、前記遮蔽板1aを木以外の材料、例えば鉄板で形
成してもよく、この場合には内面に模様を入れる必要が
ある。Furthermore, the shielding plate 1a may be formed of a material other than wood, for example, an iron plate, and in this case, it is necessary to form a pattern on the inner surface.
［発明の効果］ 以上詳述したように、本発明のコロナ放電処理方法によ
れば、樹脂成形品の表面が十分に活性化されなかったこ
とに起因する不良品の発生を未然に防止することができ
る。そのため、コロナ放電処理後に接触角を測定したり
指数標準液の液ぎれ状態を観察したりするという活性化
の程度を確認する作業が不要となる。[Effects of the Invention] As described in detail above, according to the corona discharge treatment method of the present invention, it is possible to prevent occurrence of defective products due to insufficient activation of the surface of the resin molded product. You can Therefore, it is not necessary to confirm the degree of activation such as measuring the contact angle or observing the liquid state of the exponential standard solution after the corona discharge treatment.
第１図は本発明を具体化した一実施例を示し、コロナ放
電処理を行うために用いられる処理装置の構成を示す図
である。 ２……搬送手段としてのベルトコンベア、６……樹脂成
形品としての中間成形品、7,8……電極、Ｃ……輝度、
Ｔ……通過時間。FIG. 1 shows an embodiment embodying the present invention, and is a diagram showing the structure of a processing apparatus used for performing corona discharge processing. 2 ... Belt conveyor as conveying means, 6 ... Intermediate molding as resin molding, 7,8 ... Electrode, C ... Luminance,
T: transit time.
Claims (1)
電圧を印加してコロナ放電を発生させるとともに、搬送
手段（２）にて樹脂成形品（６）を搬送して両電極（7,
8）間を通過させ、前記コロナ放電により生成したオゾ
ンで樹脂成形品（６）の表面を活性化させるようにした
コロナ放電処理方法において、 前記両電極（7,8）間の輝度と、樹脂成形品（６）が両
電極（7,8）間を通過するのに要する時間との積が予め
設定された値よりも小さくなったとき、樹脂成形品
（６）の表面活性化が不十分として、両電極（7,8）間
の電圧印加及び樹脂成形品（６）の搬送を停止させるよ
うにしたことを特徴とするコロナ放電処理方法。1. A high voltage is applied between a pair of electrodes (7, 8) facing each other to generate a corona discharge, and a resin molding (6) is conveyed by a conveying means (2). Electrode (7,
8) The corona discharge treatment method in which the surface of the resin molded product (6) is activated by ozone generated by the corona discharge, the brightness between the electrodes (7, 8) and the resin When the product of the time required for the molded product (6) to pass between both electrodes (7, 8) becomes smaller than the preset value, the surface activation of the resin molded product (6) is insufficient. As a result, the corona discharge treatment method is characterized in that the voltage application between both electrodes (7, 8) and the conveyance of the resin molded product (6) are stopped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2185596A JPH0725909B2 (en) | 1990-07-12 | 1990-07-12 | Corona discharge treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2185596A JPH0725909B2 (en) | 1990-07-12 | 1990-07-12 | Corona discharge treatment method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0472336A JPH0472336A (en) | 1992-03-06 |
| JPH0725909B2 true JPH0725909B2 (en) | 1995-03-22 |
Family
ID=16173570
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2185596A Expired - Lifetime JPH0725909B2 (en) | 1990-07-12 | 1990-07-12 | Corona discharge treatment method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0725909B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11260220A (en) | 1998-03-13 | 1999-09-24 | Uchiya Thermostat Kk | Thermal protector |
-
1990
- 1990-07-12 JP JP2185596A patent/JPH0725909B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0472336A (en) | 1992-03-06 |
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