JP6385231B2 - Printing method on the coating surface - Google Patents
Printing method on the coating surface Download PDFInfo
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- JP6385231B2 JP6385231B2 JP2014205558A JP2014205558A JP6385231B2 JP 6385231 B2 JP6385231 B2 JP 6385231B2 JP 2014205558 A JP2014205558 A JP 2014205558A JP 2014205558 A JP2014205558 A JP 2014205558A JP 6385231 B2 JP6385231 B2 JP 6385231B2
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- 238000000576 coating method Methods 0.000 title claims description 77
- 239000011248 coating agent Substances 0.000 title claims description 76
- 238000007639 printing Methods 0.000 title claims description 60
- 238000000034 method Methods 0.000 title claims description 37
- 239000003973 paint Substances 0.000 claims description 34
- 239000000843 powder Substances 0.000 claims description 22
- 229920001187 thermosetting polymer Polymers 0.000 claims description 19
- 238000007641 inkjet printing Methods 0.000 claims description 12
- 239000003960 organic solvent Substances 0.000 claims description 4
- 239000002783 friction material Substances 0.000 description 31
- 239000000463 material Substances 0.000 description 8
- 239000002994 raw material Substances 0.000 description 7
- 239000000853 adhesive Substances 0.000 description 6
- 230000001070 adhesive effect Effects 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 239000011230 binding agent Substances 0.000 description 5
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- 238000004519 manufacturing process Methods 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 4
- 239000003607 modifier Substances 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 229920000728 polyester Polymers 0.000 description 4
- 230000002265 prevention Effects 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 238000007711 solidification Methods 0.000 description 4
- 230000008023 solidification Effects 0.000 description 4
- 238000004381 surface treatment Methods 0.000 description 4
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 239000004519 grease Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 238000007591 painting process Methods 0.000 description 3
- 238000005498 polishing Methods 0.000 description 3
- 239000004593 Epoxy Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000009503 electrostatic coating Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000003856 thermoforming Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000003851 corona treatment Methods 0.000 description 1
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- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
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- 230000000704 physical effect Effects 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 238000009832 plasma treatment Methods 0.000 description 1
- 238000007517 polishing process Methods 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
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- Application Of Or Painting With Fluid Materials (AREA)
Description
本発明は、粉体の熱硬化性塗料からなる塗膜表面へインクジェット式の印刷装置を用いて印刷する印刷方法に関する。 The present invention relates to a printing method for printing on the surface of a coating film composed of a powder thermosetting paint using an ink jet printing apparatus.
自動車のディスクブレーキに使用されるディスクブレーキパッドは、金属製のバックプレートと呼ばれるベース部材の片面に摩擦材を貼り合せた工業製品であり、摩擦材の摩擦面を除く表面全体に粉体の熱硬化性塗料からなる保護用の塗膜を塗布し、その塗膜表面にインクジェット式の印刷装置を用いて各種文字や数字等を印刷している。
ディスクブレーキパッドの製造から印刷までの工程の一例について説明する。
Disc brake pads used for automobile disc brakes are industrial products in which a friction material is bonded to one side of a base member called a metal back plate, and the entire surface excluding the friction surface of the friction material is heated with powder. A protective coating made of a curable coating is applied, and various characters and numbers are printed on the coating surface using an ink jet printing apparatus.
An example of the process from manufacturing the disc brake pad to printing will be described.
＜１＞混合工程
繊維基材、熱硬化性樹脂等の結合材、潤滑材、研削材等の無機摩擦調整材、有機摩擦調整材等の摩擦材原料を所定量配合した摩擦材原料配合物を混合機に投入して均一に分散するまで攪拌混合し、摩擦材原料混合物を得る。
<1> Mixing process A friction material raw material composition containing a predetermined amount of a binder material such as a fiber base material, a thermosetting resin, an inorganic friction modifier such as a lubricant, an abrasive, and a friction material such as an organic friction modifier. The mixture is stirred and mixed until it is uniformly dispersed, and a friction material raw material mixture is obtained.
＜２＞予備成型工程
計量した摩擦材原料混合物を予備成型用型に投入し、プレス装置を用いて加圧して摩擦材予備成型品を得る。
<2> Preliminary molding process The measured friction material raw material mixture is put into a preforming mold and pressurized using a press device to obtain a friction material preform.
＜３＞バックプレート洗浄・表面処理・接着剤塗布工程
金属製のバックプレートを洗浄し、防錆処理等の表面処理を行い、摩擦材の貼着予定面に接着剤を塗布する。
<3> Back plate cleaning / surface treatment / adhesive application step A metal back plate is washed, subjected to a surface treatment such as a rust prevention treatment, and an adhesive is applied to the surface where the friction material is to be adhered.
＜４＞加熱加圧成型工程
予備成型工程で得られた摩擦材予備成型品と、接着剤を塗布したバックプレートとを重ねて熱成型用型に投入し、プレス装置を用いて加熱加圧して摩擦材を成型すると同時に、バックプレートに摩擦材を貼り付ける。
<4> Heat and pressure molding process The friction material preform formed in the preforming process and the back plate coated with the adhesive are stacked and placed in a thermoforming mold, and heated and pressurized using a press device. At the same time that the friction material is molded, the friction material is applied to the back plate.
＜５＞熱処理工程
摩擦材の成型品を炉の中で加熱して、摩擦材に結合材として含まれる熱硬化性樹脂の硬化反応を完了させる。
<5> Heat treatment step The molded product of the friction material is heated in a furnace to complete the curing reaction of the thermosetting resin contained in the friction material as a binder.
＜６＞研磨工程
砥石を具備する研磨装置を用いて摩擦材の表面を研磨し、摩擦面を形成する。
<6> Polishing process The surface of the friction material is polished using a polishing apparatus including a grindstone to form a friction surface.
＜７＞塗装工程
防錆や商品価値の向上を目的とし、摩擦材の摩擦面を除く表面全体に粉体の熱硬化性の塗料を静電塗装し、加熱して塗料を焼き付ける。
<7> Painting process For the purpose of rust prevention and improvement of commercial value, electrostatic coating is applied to the entire surface excluding the friction surface of the friction material, and the paint is heated and baked.
＜８＞印刷工程
塗膜の表面に、製造業者の商標、品番、材質名、ロット番号、バーコード等の複数の印字マークを、インクジェット式の印刷装置を用いて印刷する。
<8> Printing process A plurality of print marks such as a manufacturer's trademark, product number, material name, lot number, and barcode are printed on the surface of the coating film using an ink jet printing apparatus.
＜９＞選択工程
必要に応じて、チャンファーと呼ばれる面取り部を形成するチャンファー加工工程や、スリットを加工するスリット加工工程、バーナーや熱板により摩擦面を焼くスコーチ工程を適宜実施する。
<9> Selection Step If necessary, a chamfer processing step for forming a chamfer called a chamfer, a slit processing step for processing a slit, and a scorch step for baking the friction surface with a burner or a hot plate are appropriately performed.
このようにして製造したディスクブレーキパッドは、梱包作業性の要請から、各ディスクブレーキパッドのバックプレートの表面に他の摩擦材の摩擦面を接面させて積み重ねた状態で出荷している。 The disc brake pads manufactured in this way are shipped in a state of being stacked with the friction surfaces of other friction materials in contact with the surface of the back plate of each disc brake pad because of the demand for packing workability.
従来の塗膜表面への印刷技術にはつぎのような問題点を有する。
＜１＞複数のディスクブレーキパッドを重ねた状態で運搬すると、振動によって、バックプレートの表面に印刷した印字マークが摩擦材の摩擦面に存在する研削材等の硬質の原料に削り取られて識別できなくなるという問題が生じる。
＜２＞印字マークの摩滅防止を目的として、摩擦材の摩擦面同士を向い合せて梱包すると、梱包作業の効率が極端に低下するといった問題がある。
＜３＞印字マークの剥落は運搬中に限らず、ブレーキ装置に組み込んで使用する際にも、キャリパやピストン等の周辺部品との摩擦により印字マークが剥落する。さらにブレーキフルードやブレーキ鳴き止め用のグリス等の油脂にインクが侵されることにより印字マークが消滅して識別できなくなるという問題がある。
＜４＞一方で、塗装工程でディスクブレーキパッドに形成される塗膜自体にも、ブレーキフルードやブレーキ鳴き止め用のグリス等の油脂に侵されないように高い耐油性が要求されており、塗料として、エポキシ系塗料、ポリエステル系塗料、エポキシ-ポリエステル系塗料等の耐油性の高い熱硬化性塗料が使用されている。
しかし、このような耐油性の高い塗膜に対しては、印刷工程で用いられるインクの濡れ性が極めて悪く、塗膜とインクの充分な密着性を得ることができず、印字マークの耐摩擦性と耐油性を低下させる要因となっている。
＜５＞塗膜表面へのインクの濡れ性を向上させるため、塗膜表面に、コロナ処理、プラズマ処理、またはフレーム処理等の前処理を施す方法も考えられるが、処理装置が煩雑となり、処理工数や製造コストが増加するので好ましくない。
The conventional printing technology for coating surfaces has the following problems.
<1> When transported in a state where a plurality of disc brake pads are stacked, the print mark printed on the surface of the back plate is scraped off by a hard material such as an abrasive existing on the friction surface of the friction material due to vibration. The problem of disappearing arises.
<2> If the friction surfaces of the friction material face each other for the purpose of preventing the print marks from being worn, there is a problem that the efficiency of the packing operation is extremely reduced.
<3> The print mark is not peeled off during transportation, but the print mark is also peeled off due to friction with peripheral parts such as a caliper and a piston when used in a brake device. Further, there is a problem that the ink mark is lost due to the oil impregnated with grease such as brake fluid or brake squealing grease and the printed mark disappears and cannot be identified.
<4> On the other hand, the coating film itself that is formed on the disc brake pad in the painting process is also required to have high oil resistance so that it is not affected by oil such as brake fluid and grease for brake squeal. Oil-resistant thermosetting paints such as epoxy paints, polyester paints, and epoxy-polyester paints are used.
However, for such a highly oil-resistant coating film, the wettability of the ink used in the printing process is extremely poor, and sufficient adhesion between the coating film and the ink cannot be obtained. This is a factor that reduces the oil resistance and oil resistance.
<5> In order to improve the wettability of the ink on the coating film surface, a pretreatment method such as corona treatment, plasma treatment, or flame treatment may be applied to the coating film surface. Since man-hours and manufacturing costs increase, it is not preferable.
また従来の一般的な印字手段をディスクブレーキパッド等の工業製品へ適用する場合にはつぎのような問題点を有する。
＜１＞特許文献１に開示されたレーザー光を照射して刻印する方法にあっては、塗装を除去して刻印するため、刻印した部位の塗膜が薄くなり、塗膜強度が低下しやすくなる。
＜２＞特許文献２には、素材に単層又は複層の塗膜層を形成する工程、前記塗膜層が未硬化の状態の上に、インクジェットにより印字マークを形成する工程、必要に応じて加熱、又は活性エネルギー線を用いてインクと塗膜を同時に硬化させる工程を経て印字するインクジェット印字方法が開示されている。
特許文献３には、耐熱性基材表面に、耐熱性塗料を塗布し、未硬化着色塗膜を形成し、次いで該塗膜表面に、溶剤可溶性含金属染料及び溶剤可溶性の耐熱性結合剤を主成分とし、前記塗料より比重及び表面張力が小さく前記塗料とは異色のインクをインクジェット印刷法にて吐出し、マーキング膜を形成し、次いで得られたマーキング膜及び前記塗膜を同時に硬化せしめることを特徴とするマーキング方法が開示されている。
特許文献４には、素材の表面に塗料またはインクにより下地層を形成する下地層形成処理工程と、下地層形成工程で形成された下地層が生乾き状態の時に、その下地層の表面に、インクジェットプリンタにより所定の画像を油性インクによりプリントするプリント処理工程とからなることを特徴とするインクジェット式プリンタによる画像プリント方法が記載されている。
これらの特許文献２〜４に開示された従来の印刷技術は過酷な環境での使用を前提としていないために、ディスクブレーキパッドのように過酷な環境で使用されることが多い工業製品に適用した場合には、印字マークの剥落を防止できるだけの耐久性が得られない。
Further, when the conventional general printing means is applied to an industrial product such as a disc brake pad, it has the following problems.
<1> In the method of engraving by irradiating the laser beam disclosed in Patent Document 1, since the coating is removed and engraving is performed, the coating film at the engraved portion becomes thin, and the coating film strength is likely to decrease. Become.
<2> Patent Document 2 includes a step of forming a single layer or a multi-layer coating layer on a material, a step of forming a print mark by inkjet on an uncured state of the coating layer, as necessary An ink jet printing method is disclosed in which printing is performed through a step of simultaneously curing an ink and a coating film using heating or active energy rays.
In Patent Document 3, a heat-resistant coating is applied to the surface of a heat-resistant substrate to form an uncured colored coating film, and then a solvent-soluble metal-containing dye and a solvent-soluble heat-resistant binder are applied to the coating film surface. The main component is a specific gravity and surface tension smaller than that of the paint, and ink of a different color from the paint is ejected by an ink jet printing method to form a marking film, and then the resulting marking film and the coating film are simultaneously cured. A marking method is disclosed.
In Patent Document 4, when a base layer is formed on the surface of the material with a paint or ink, and when the base layer formed in the base layer formation step is in a dry state, an ink jet is formed on the surface of the base layer. An image printing method using an ink jet printer is described, which comprises a print processing step of printing a predetermined image with oil-based ink by a printer.
Since the conventional printing techniques disclosed in these Patent Documents 2 to 4 are not premised on use in a harsh environment, they are applied to industrial products that are often used in a harsh environment such as a disc brake pad. In such a case, it is not possible to obtain durability sufficient to prevent the print mark from peeling off.
本発明は以上の点に鑑みて成されたもので、その目的とするところは、粉体の熱硬化性塗料からなる塗膜表面に、インクジェット式の印刷装置を用いてインクを印刷する印刷方法において、塗膜表面とインクとの密着性を向上させつ、耐久性の高い印字マークを得ることができる、塗膜表面への印刷方法を提供することにある。 The present invention has been made in view of the above points, and an object of the present invention is to provide a printing method for printing ink on the surface of a coating film made of a powder thermosetting paint using an ink jet printing apparatus. In the above, it is an object to provide a printing method on the coating film surface, which can improve the adhesion between the coating film surface and the ink and obtain a highly durable printing mark.
本発明者らは鋭意検討を重ねた結果、ディスクブレーキパッドに粉体の熱硬化性塗料を塗装した後、加熱することにより塗料を焼き付け、塗膜の固化が完了する前に塗膜表面にインクジェットプリンタを用いて印刷することにより耐久性の高い印字マークを得られることを知見した。 As a result of intensive studies, the present inventors have applied a powder thermosetting paint to the disc brake pad, and then baked the paint by heating, before the solidification of the paint film is completed, the ink jet is applied to the paint film surface. It has been found that a highly durable print mark can be obtained by printing using a printer.
またこの印刷方法は、ディスクブレーキパッド以外の、粉体の熱硬化性塗料からなる塗膜が形成される工業製品においても好適である。 This printing method is also suitable for industrial products other than the disc brake pad, in which a coating film made of a powder thermosetting paint is formed.
本発明は、粉体の熱硬化性塗料からなる塗膜表面に、インクジェット式の印刷装置を用いてインクを印刷する印刷方法に関し、以下の技術を基礎とするものである。 The present invention relates to a printing method for printing ink on the surface of a coating film made of a thermosetting paint of powder using an ink jet printer, and is based on the following technique.
（１）粉体の熱硬化性塗料からなる塗膜表面に、インクジェット式の印刷装置を用いてインクを印刷する印刷方法であって、前記印刷を、熱硬化性塗料を焼き付けた後、塗膜が完全に固化する前に行い、印刷後に塗膜の固化を完了させる印刷方法において、印刷に用いるインクは有機溶剤を使用したインクであり、印刷時における前記塗膜の表面温度が１００℃〜１８０℃である印刷方法。
（２）被塗装物がディスクブレーキパッドであることを特徴とする（１）の印刷方法。
(1) A printing method in which ink is printed on a coating film surface made of a powder thermosetting paint using an ink jet printing apparatus, and the coating is performed after baking the thermosetting paint. In the printing method in which the solidification of the coating film is completed after printing, and the ink used for printing is an ink using an organic solvent, the surface temperature of the coating film during printing is 100 ° C to 180 ° C. Printing method that is in ° C.
(2) The printing method according to (1 ), wherein the object to be coated is a disc brake pad.
本発明によれば、粉体の熱硬化性塗料からなる塗膜表面に、インクジェット式の印刷装置を用いてインクを印刷する印刷方法において、塗膜表面とインクとの密着性を向上させて、耐久性の高い印字マークを印刷することができる。 According to the present invention, in the printing method of printing ink on the surface of a coating film made of a thermosetting paint of powder using an ink jet printer, the adhesion between the coating film surface and the ink is improved, Printing marks with high durability can be printed.
以下に図面を参照しながら、本発明を実施するための形態について説明する。 Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
＜１＞塗膜表面への印刷方法の概要
本発明は粉体の熱硬化性塗料からなる塗膜表面へ向けて、インクジェット式の印刷装置を用いて各種の印字マークを印刷する印刷方法であり、熱硬化性塗料を焼き付けた後、塗膜が完全に固化する前に印刷を行い、印刷後に塗膜の固化を完了させる印刷方法である。
<1> Outline of printing method on coating film surface The present invention is a printing method for printing various print marks using an ink jet printing device toward a coating film surface made of a thermosetting paint of powder. In this printing method, after the thermosetting paint is baked, printing is performed before the coating film is completely solidified, and solidification of the coating film is completed after printing.
＜２＞印刷対象
本例ではディスクブレーキパッドを対象に説明するが、印刷対象は粉体塗装を施す製品であればディスクブレーキパッドに限定されず、過酷な環境で使用される各種の工業製品に適用可能である。
<2> Print target In this example, the disc brake pad is described as an object. However, the print target is not limited to the disc brake pad as long as it is a product to which powder coating is applied, and various industrial products used in harsh environments. Applicable.
＜３＞ディスクブレーキパッドの製造から印刷までの工程
ディスクブレーキパッドの製造から印刷までの作業工程の一例について説明する。
<3> Steps from manufacture of disc brake pad to printing An example of work steps from manufacture of disc brake pad to printing will be described.
＜３．１＞混合工程
繊維基材、熱硬化性樹脂等の結合材、潤滑材、研削材等の無機摩擦調整材、有機摩擦調整材等の摩擦材原料を所定量配合した摩擦材原料配合物を混合機に投入して均一に分散するまで攪拌混合し、摩擦材原料混合物を得る。
<3.1> Mixing step Friction material raw material blending predetermined amounts of fiber base materials, binders such as thermosetting resins, inorganic friction modifiers such as lubricants and abrasives, and friction material raw materials such as organic friction modifiers The product is put into a mixer and stirred and mixed until it is uniformly dispersed to obtain a friction material raw material mixture.
＜３．２＞予備成型工程
計量した摩擦材原料混合物を予備成型用型に投入し、プレス装置を用いて加圧して摩擦材予備成型品を得る。
<3.2> Preliminary molding step The measured friction material raw material mixture is put into a preforming mold and pressurized using a press device to obtain a friction material preform.
＜３．３＞バックプレート洗浄・表面処理・接着剤塗布工程
金属製のバックプレートを洗浄し、防錆処理等の表面処理を行い、摩擦材の貼着予定面に接着剤を塗布する。
<3.3> Backplate Cleaning / Surface Treatment / Adhesive Application Step The metal backplate is cleaned, subjected to surface treatment such as rust prevention treatment, and the adhesive is applied to the planned adhesion surface of the friction material.
＜３．４＞加熱加圧成型工程
予備成型工程で得られた摩擦材予備成型品と、接着剤を塗布したバックプレートとを重ねて熱成型用型に投入し、プレス装置を用いて加熱加圧して摩擦材を成型すると同時に、バックプレートに摩擦材を貼り付ける。
<3.4> Heating and pressing molding process The friction material preform obtained in the preforming process and the back plate coated with the adhesive are stacked and put into a thermoforming mold, and heated using a press device. At the same time as the friction material is molded by pressing, the friction material is applied to the back plate.
＜３．５＞熱処理工程
摩擦材の成型品を炉の中で加熱して、摩擦材に結合材として含まれる熱硬化性樹脂の硬化反応を完了させる。
<3.5> Heat treatment step The molded product of the friction material is heated in a furnace to complete the curing reaction of the thermosetting resin contained in the friction material as a binder.
＜３．６＞研磨工程
砥石を具備する研磨装置を用いて摩擦材の表面を研磨し、摩擦面を形成する。
<3.6> Polishing Step The surface of the friction material is polished using a polishing apparatus equipped with a grindstone to form a friction surface.
＜３．７＞塗装工程
防錆や商品価値の向上を目的とし、摩擦材の摩擦面を除く表面全体に粉体の熱硬化性の塗料を静電塗装し、加熱して塗料を焼き付けて塗膜を形成する。
<3.7> Painting process For the purpose of rust prevention and improvement of commercial value, electrostatic coating is applied to the entire surface excluding the friction surface of the friction material, and the coating is heated and baked. A film is formed.
＜３．７．１＞粉体塗装装置
粉体塗装装置としては、コロナ帯電方式、摩擦帯電方式の従来の粉体塗装装置を使用することができる。
<3.7.1> Powder Coating Device As a powder coating device, a conventional powder coating device of a corona charging method or a friction charging method can be used.
＜３．７．２＞粉体の熱硬化性塗料
塗膜に用いる粉体の熱硬化性塗料としては、エポキシ系粉体塗料、ポリエステル系粉体塗料、アクリル系粉体塗料、エポキシ-ポリエステル系粉体塗料から選択される粉体塗料を使用することができる。
<3.7.2> Powder thermosetting paint As the powder thermosetting paint used in the coating film, epoxy powder paint, polyester powder paint, acrylic powder paint, epoxy-polyester paint A powder coating selected from powder coatings can be used.
＜３．７．３＞塗装の焼き付け
塗装の焼き付けは、熱風対流式、赤外線による輻射式を使用することができ、塗装の焼き付け条件は、塗料の種類にもよるが、通常は１８０℃〜２５０℃、４分〜３０分の範囲で行う。
<3.7.3> Baking of paint The baking of the paint can be carried out using a hot air convection type or an infrared radiation type, and the baking condition of the paint depends on the type of paint, but is usually 180 ° C to 250 ° C. C., performed for 4 to 30 minutes.
＜３．８＞印刷工程
バックプレートの部分に、製造業者の商標、品番、材質名、ロット番号、バーコード等の複数の印字マークを、インクジェット式の印刷装置を用いて印刷する。
本発明では、以下に説明するように塗膜が完全に固化する前に印刷を行うことが肝要である。
<3.8> Printing Step A plurality of print marks such as a manufacturer's trademark, product number, material name, lot number, and bar code are printed on the back plate using an ink jet printing apparatus.
In the present invention, as described below, it is important to perform printing before the coating film is completely solidified.
＜３．８．１＞インク
印刷に用いるインクは、顔料系、染料系どちらでもよく、メチルエチルケトン、メタノール、アセトン等の有機溶剤を使用した速乾性のインクを使用するのが好ましい。
<3.8.1> Ink The ink used for printing may be either pigment-based or dye-based, and it is preferable to use a quick-drying ink using an organic solvent such as methyl ethyl ketone, methanol, and acetone.
＜３．８．２＞印刷時における塗膜の表面温度
インクを塗膜に強固に定着させるには、印刷時における塗膜の表面温度が重要である。
印刷時における塗膜の表面温度は工業製品の種別と、塗膜とインキの物性等を考慮して適宜選択する。
すなわち、バックプレートに印刷する場合は、塗装の焼き付け直後において、塗膜表面の温度が６０℃以上であり、塗膜が完全に固化していない状態のときにインクジェット式の印刷装置を用いて印刷を行う。
塗膜の表面温度は６０℃〜２００℃の範囲であり、実用上は１００℃〜１８０℃の範囲であり、１２０〜１６０℃が最適な温度である。
塗膜の表面温度が６０℃を下回ると、塗膜に対するインキの付着性が著しく低下し、２００℃を越えるとインクジェット式の印刷装置のインクジェットヘッド部が熱により変形するといった問題や、インクに含まれる有機溶剤が揮発し、インクジェットヘッド部でインクが詰まるといった問題が生じる。
<3.8.2> Surface temperature of coating film during printing In order to firmly fix the ink to the coating film, the surface temperature of the coating film during printing is important.
The surface temperature of the coating film during printing is appropriately selected in consideration of the type of industrial product and the physical properties of the coating film and ink.
That is, when printing on the back plate, printing is performed using an ink jet printing device when the temperature of the coating film surface is 60 ° C. or higher immediately after baking of the coating and the coating film is not completely solidified. I do.
The surface temperature of the coating film is in the range of 60 ° C. to 200 ° C., practically in the range of 100 ° C. to 180 ° C., and 120 to 160 ° C. is the optimum temperature.
If the surface temperature of the coating film is lower than 60 ° C, the adhesion of the ink to the coating film is remarkably reduced, and if it exceeds 200 ° C, the ink jet head part of the ink jet printing apparatus is deformed by heat, and it is included in the ink. The organic solvent to be volatilized evaporates and the ink is clogged in the inkjet head.
＜３．８．３＞塗膜が完全に固化していない状態とは
本発明において、塗膜が完全に固化していない状態とは、焼き付けによる塗料の硬化反応がほぼ完了しており、塗膜に金属製の刃物を押し当てたときに、塗膜に刃物の跡がつく程度に粘度を保っている状態を意味する。
<3.8.3> What is the state where the coating film is not completely solidified? In the present invention, the state where the coating film is not completely solidified means that the curing reaction of the paint by baking is almost completed. When a metal blade is pressed against the film, it means a state where the viscosity is maintained to such an extent that the blade is marked on the coating film.
塗膜が高温で、且つ、粘度を保った状態でインクジェット式の印刷装置を用いて印刷すると、インクが未固化状態の塗膜組織に浸透してインクの定着性(付着性)が格段に高くなる。
これにより、塗膜を冷却して固化した際における塗膜とインク間の機械的強度が増強されて、耐久性の高い印字マークを得ることができる。
When printing using an ink jet printer with the coating film kept at a high temperature and maintaining viscosity, the ink penetrates into the unsolidified coating film structure, and the fixability (adhesion) of the ink is remarkably high. Become.
Thereby, the mechanical strength between the coating film and the ink when the coating film is cooled and solidified is enhanced, and a highly durable print mark can be obtained.
なお、塗膜が完全に固化した後に、塗膜表面の温度を６０℃以上となるように再加熱して印刷した場合では、上記したようなインクの浸透作用が得られないだけでなく、インクと塗膜間における高い付着強度が得られない。 In addition, when the coating film is completely solidified and printed by reheating so that the temperature of the coating film surface becomes 60 ° C. or higher, not only the ink penetration action as described above is obtained, but also the ink And high adhesion strength between the coating films cannot be obtained.
＜３．９＞塗膜の冷却固化
印字マークの印刷を行った後に塗膜を固化する。
塗膜表面を完全に固化させるための冷却方法としては、例えば強制冷却、室温での自然冷却等を適用することができる。
<3.9> Cooling and solidification of coating film After printing the print mark, the coating film is solidified.
As a cooling method for completely solidifying the coating film surface, for example, forced cooling, natural cooling at room temperature, or the like can be applied.
自動車用ディスクブレーキパッドのバックプレートに使用される自動車構造用熱間圧延鋼板ＳＡＰＨ４４０（厚さ６．０ｍｍ）を被塗装物として用い、表１の条件にて塗装、塗装の焼き付けを実施し、「１２３４５６」の印字マークの印刷を行った。 Using hot rolled steel plate SAPH440 (thickness 6.0 mm) for automobile structure used as the back plate of the disc brake pad for automobiles as the object to be coated, painting and baking were performed under the conditions shown in Table 1. The print mark “123456” was printed.
印字マークの耐久性は耐摩耗性と耐油性を評価した。評価方法および評価基準を表２に示す。 The durability of the printed marks was evaluated for wear resistance and oil resistance. Table 2 shows the evaluation method and evaluation criteria.
実施例１〜３については、印字マークの耐摩耗性と耐油性に関し、実用条件に耐え得る評価が得られ、印刷時の塗膜表面温度が１４０℃の実施例３が最も耐久性に優れていた。
これに対し、印刷時の塗膜表面温度が５０℃である比較例１では、印字マークの耐摩耗性に難点があり、また塗膜表面を室温まで冷却して完全に固化させた後、再加熱により塗膜表面温度を１４０℃にして印刷を行った比較例２においては、耐摩耗性および耐油性において印字マークが剥落して判別不能であった。
About Examples 1-3, evaluation which can endure practical conditions is obtained regarding the abrasion resistance and oil resistance of a printed mark, and Example 3 whose coating-film surface temperature at the time of printing is 140 degreeC is the most excellent in durability. It was.
On the other hand, in Comparative Example 1 where the coating film surface temperature during printing was 50 ° C., there was a difficulty in the abrasion resistance of the printed mark. After the coating film surface was cooled to room temperature and completely solidified, it was restarted. In Comparative Example 2 in which printing was performed with the coating film surface temperature being 140 ° C. by heating, the print marks were peeled off in terms of wear resistance and oil resistance, and thus could not be discriminated.
Claims (2)
インクの一部が前記塗膜に浸透するように、前記粉体の熱硬化性塗料を焼き付けた直後で、かつ塗膜が完全に固化していない加熱状態の塗膜に印刷する印刷方法において、
印刷に用いるインクは有機溶剤を使用したインクであり、
印刷時における前記塗膜の表面温度が１００℃〜１８０℃であることを特徴とする、
塗膜表面への印刷方法。 A printing method for printing on the surface of a coating film formed by baking a powder thermosetting paint applied to the surface of an object to be coated, using an ink jet printing apparatus,
In a printing method for printing on a heated coating film immediately after baking the powder thermosetting paint so that a part of the ink penetrates the coating film, the coating film is not completely solidified ,
The ink used for printing is an ink using an organic solvent,
The surface temperature of the coating film during printing is 100 ° C. to 180 ° C. ,
Printing method on the coating surface.
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