Paintline defects.ppt

1、Paint Application Common Defects/Trouble Shooting,涂料的应用 常见缺陷/解决对策,Build up 积漆,Appearance:外观表现 Running of the paint film in rivulets 漆膜在形成过程中形成的。,Cause: 原因 Improper thinners: too slow evaporating不适当的稀释剂:蒸发太慢 Excessive film thickness 漆膜过厚 Paint temperature too high涂料温度过高 Gun position out of place 喷枪位置

2、偏离,Build up积漆,Prevention预防 Use recommended thinner as specified 使用指定推荐的稀释剂 Adjust air pressure 调节空气压力 Use specified film thickness 使用指定的漆膜厚度 Maintain constant paint temperature 保持固定的涂料温度 Adjust gun position 调整喷枪的位置,Orange Peel 橘皮,Appearance:外观表现 Resembles the skin of an orange像橘子皮一样,Causes:原因 Insuff

3、icient thinner added to the paint 稀释剂添加不足 Improper thinning solvent: too fast evaporating 不适当的溶剂：蒸发过快 Low film thickness 膜厚太薄 Improper air pressure 不适当的空气压力 Paint temperature too low 油漆温度过低,Orange Peel 橘皮,Prevention:预防 Lower viscosity of paint 降低涂料的黏度 Reduce with slower evaporating solvents减少蒸发过慢的溶剂

4、 Proper air and application equipment adjustments适当的空气和应用设备的调整 Maintain constant paint temperature 保持固定的涂料温度 Use specified film thickness使用指定的漆膜厚度,Crater 火山口 (Fisheyes鱼眼, Pinholing针孔),Appearance:外观表现 Small crater-like depressions in the film 漆膜上像火山口一样的小坑,Causes:原因 Improper cleaning of substrate底材清洗不

5、当 Oil, water or other contaminant in spray lines喷涂线上有油、水或其他污染物 Silicone or other contaminant in working area atmosphere在工作区域空气中有硅酮或其他污染物 Low film thickness降低漆膜厚度,Crater火山口,Prevention:预防 Surface to be painted must be thoroughly clean and dry待喷涂的表面必须彻底清洗和干燥 Use specified film thickness使用指定的漆膜厚度 Use pr

6、oper maintenance to prevent contaminants from entering spray lines. 使用适当的维护,防止污染物进入喷涂线。 Eliminate contaminants from entering application areas. 消除应用范围的污染物,Blistering气泡 (Solvent Popping溶剂起泡, Pinholes针孔),Appearance: 外观表现 Broken edged craters if the blisters have burst 气泡破裂就会成为火山口,Causes:原因 Excessive f

7、ilm build: trapped solvents漆膜过厚:溶剂不能完全 Insufficient flash-off time before baking烘烤前流平时间不足 Excessive temperature in first oven zone烘烤过急 Gasses trapped in the substrate, are forced out when the coating is baked at high temperatures. 气体困在底层,高温烘烤时强强行挥发出来,Blistering气泡,Prevention:预防 Use specified film thi

8、ckness使用指定的膜厚度 Reduce temperature in first oven zone降低烤炉前段的温度 Increase flash-off time prior to baking增加烘烤前的流平时间 Reduce overall oven temperature烤炉温度整体降低,Particles/Dirt 颗粒与脏污,Appearance:外观表现 Foreign particles dried in paint film外来的颗粒干燥在漆膜上,Cause: 原因 Improper cleaning of the substrate 底材清洁不当 Defective

9、air regulator cleaning filter空气调节器清洗滤网有缺陷 Dirty working area工作区域不干净 Defective or dirty air inlet filters in spray booth and/or ovens 喷房或烤炉的空气滤网有缺陷或不洁净 Dirty spray equipment 喷涂设备不洁净 Dirt in oven or paint 烤炉或涂料不洁净 Insufficient agitation of paint 油漆搅拌不充分,Particles/Dirt颗粒与脏污,Prevention:预防 Clean surface

10、thoroughly 彻底清洁表面 Agitate paint thoroughly before using涂料使用前搅拌充分 Be sure all equipment are clean 确认所有设备清洁 Replace air inlet filters if dirty or defective更换有缺陷或脏污的空气滤网 Maintain a clean spray area. 保持洁净的喷涂环境 Clean or replace:清洗或更换 filters in solvent lines, air regulator, compressor, paint lines, spray

11、 booths and ovens 空气调节器、压缩机、喷涂线、喷房、调漆室和烤炉的滤网 Keep all paint containers closed to prevent contamination. 保持所有的油漆容器关闭,以防止污染 Schedule a maintenance/cleaning day every week每周定期保养一次 Flush paint lines thoroughly with clean solvent when not in use and prior to changing paints 喷涂线不用时和使用前需使用溶剂彻底冲洗,Particles/

12、Dirt 颗粒与脏污,Particles/Dirt颗粒与脏污,Gloss Issues 光泽问题,Appearance: 外观表现 Gloss is higher, or lower than acceptable standard 光泽高于或低于可接受的标准 Causes of High Gloss:光泽过高的原因 Paint film is under-cured 漆膜没固化完全 Excessive film thickness 漆膜过厚 Insufficient agitation of paint 油漆搅拌不充分 Mixing ratio incorrect 油漆配比不正确 Cause

13、s of Low Gloss:光泽过低的原因 Paint film is over-cured 漆膜过度固化 Insufficient film thickness 漆膜过薄 Insufficient agitation of paint油漆搅拌不充分 Mixing ratio incorrect油漆配比不正确 Topcoats applied onto uncured priming coats 底漆没有完全固化的条件下喷涂面漆,Gloss too high 光泽过高,Prevention:预防 Use recommended curing times 使用推荐的固化时间 Use speci

14、fied film thickness 使用制定的漆膜厚度 Agitate paint thoroughly before using 使用前充分搅拌 Use correct specification for mixing 使用正确的油漆配比,Gloss too low 光泽过低,Prevention:预防 Use recommended curing times 使用推荐的固化时间 Increase film thickness 降低膜厚 Agitate paint thoroughly before using 使用前彻底搅拌 Use recommended thinners. 使用推荐

15、的稀释剂 Use correct specification for mixing 使用正确的油漆配比,Colour difference 色差,Appearance:外观表现 colour does not match approved standard. 颜色和已承认的颜色不一致 Causes: 原因 Difference in gloss due to over curing or under curing.固化的程度造成光泽的差异 Paint contaminated with other colours油漆含有其他颜色 Excessive or insufficient film t

16、hickness 漆膜的薄厚差异 Insufficient agitation of paint 油漆搅拌不充分 Wrong specified viscosity 错误的油漆黏度,Colour difference 色差,Prevention:预防 Agitate paint thoroughly before using. 使用前充分搅拌 Clean all paint lines and agitation equipment thoroughly before switching colours. 切换颜色之前彻底清洁喷涂线和搅拌设备 Employ proper application

17、 techniques when spraying metallics喷涂时使用适当的应用技术 Apply correct film thickness 应用正确的膜厚 Use recommended curing times 使用推荐的固化时间 Ensure viscosity is correct 确认油漆的黏度没有问题,Pigment Stand Up 色浆颗粒突起,Associated with Aluminium Basecoats 和底漆中的铝粉结合在一起 Pigments stand up 色素颗粒突起 Specification failure to substrate 咬底,

18、Pigment stand up,Pigment stand up,Prevention:预防 Prevent dry spray 避免喷涂过干 Apply wetter coats 应用湿膜涂装,Questions & Answers?,Thanks,Q&A,硬化劑是噴漆必要加的嗎? 硬化劑對於噴漆的品質有何影響? 必需的！如果不加将不会干透，其作用是在一定的温度下使反应加快！对于功能有决定性作用。 2. 如何來判定噴漆需要”幾塗幾烤”, 影響的因素有哪些? 底材材質, 顏色 or 噴漆材質, 顏色? 根据颜色，素材来决定，一般比较炫的亮色要打底，用非颜色本身素材时也要打底。一般黑白银等色一底 3. 現行的遮噴治具有哪幾種? (木模, 塑膠單pcs模, 真空模 , 各自的優缺點為何?) 如何來選定適合的遮噴治具? 遮蔽没有产品要求高，但也要开磨具来打产品。,4. 自動線與手動線的差異, 速度, 產能, 品質 或是 產品特徵限制? 自动线的重复性很强。直接调程序。手动线要靠人来控制，对人的要求很高。 5. 皮革漆, 金屬漆個別不同的漆對於素材的噴漆面表面有任何要求限制 (粗糙度?)嗎? 皮革漆对素材表面要求不是太高，当然，抛光的表面还是比不抛光的好。对于高光产品，最好是抛光的，更，光滑。,6. 噴漆製程在沒有 coating 後製程前, 能夠達到的硬度要求為何?