Narrow ridges 窄脊
smoother surface 较光滑
Result 结构
Geometry of ridges 几何脊
Two printing dots just after printing 仅印刷后的效果 Two printing dots after drying 烘干后效果
Wide ridges 宽脊
Quality Type of Remark Quality Type of gravure Bemerkung gravure roller 备注 重量 roller 印刷辊种类 1. Line screen Problem 1. Linienraster Problem: 线纹 问题: torn herausgerissene out screen Rasterlinien lines 2. HR Raster 去除线纹 2. HR screen HR 纹 3. R- und KR Raster 3. R- and KR screen R/ KR 纹
21-LR 30/12
Name of the Geometry 几何名称
The screen engravings are described by 筛纹网格为: •Opening 开口 •frustum 平截头体 •ridge 脊状 •Depth 深度 •big volume of the screen engravings: high coating weight 筛纹网格的大容量：涂层重量大 6
Round plate
Example 举例
CircumFerence 周长 (mm)
Diameter 直径
Substance Deflection 物质 偏差
Surface表面 length of roll 辊长
2
Structure of the gravure roller II 印刷辊结构 II
• given coating weight for the layer 涂层重量 • prescribed type of screen 筛纹制定种类 • flow behaviour of the lacquer 漆品流动情况
Factors of influence for choice of a replacement gravure roller选择替换印刷辊影响因素
Conventional gravure printing the surface opening of the screen engravings is the same, the depth Varies 传统网版印刷辊表面的筛纹网 格开口大小一样，但深度不同
Autotype gravure printing the surface of the screen engravings differs, the depth is the same 碳印网版印刷辊表面的筛纹 网格开口大小不同，深度一 致
• Reasons 原因
– abrasive (hard) pigments flatten the screen engravings研磨（ 硬性）颜料会磨平筛纹网格 – grinding off by doctor blade 刮墨刀磨损
• Effects 结果
– faults in the printed image (p.ex. sample at limit, polish master stripe) 印刷效果不佳（）
– cross diagonal screen 交叉斜纹 – chromed surface of printing cylinder 5 印刷辊的铬制表面
The name of gravure rollers 网版印刷辊的名称
Name of gravure rollers网版印刷辊的名称
Format格式:
•abbreviation for measurements of the roller滚筒尺寸的缩写 •in may machines only gravure rollers of one format can run
Type of screen 筛纹种类
Lines per cm 线纹量/厘米 screen engravings per cm 筛纹网纹量/厘米 12th roller of this kind of roller 此种辊之12号
Replacement gravure roller 替换印刷辊
Conversion by means of the coating weight of standard lacquer on the replacement roller 据替换辊上的标准漆涂层的重量进行 8
Attrition of the gravure roller 印刷辊磨损
not so smooth surface 不很光滑
7
Gravure roller and printing quality 印刷辊和印刷质量
Printing quality印刷质量: – characterised by 特点为:
• smooth position 光滑 • flow of lacquer 流畅
Construction 结构 • seamless rolled steel roll无缝钢筒 • sealed round plates 密封圆盘 • Pivots 枢轴 Demands 要求 • exact concentric running同心旋转 • little unbalance 平衡 • high flexural strength 高挠曲强度
• Appearance 表现
– chromed gravure rollers 铬制印刷辊
• after approx. 400 000 - 600 000 m 约400 000 - 600 000 米
– ceramic gravure rollers 陶制印刷辊
• after approx. 1 - 2 mio m 约1 000 000 – 2 000 000 米
chromed gravure rollers 铬制印刷辊 • metal core-copper layer-Chrome layer 金属芯—铜层—铬层 Ceramic rollers 陶制辊 • Layers层面: metal core-chromium oxide layer金属—铬氧化层
Steel cylinder (carrier) 钢辊（载体） Chromium oxide layer (screen) 铬氧化层（筛纹）
The gravure roller 印刷辊
Training for production staff 生产部门培训
1
Structure of the gravure roller 印刷辊结构
Construction of cylinder 滚筒结构
Unbalance drill pivot Steel tube
4
Types of gravure rollers 印刷辊种类
Types of screens 筛纹种类
• name is corresponding to the form of the printing dots 根据印刷点的形状命名
Structure of the screen筛纹结构
• Example例如:
• Countermeasure 解决办法
– reclaim of the surface of the gravure roller 替换印刷辊表面
9
Steel cylinder (carrier) 钢辊（载体） Soft copper layer (screen) 软铜层（筛纹）
Hard chrome layer 硬铬层
•Field of application适用范围: • Field of application适用范围: large quantity of running meters 大量印刷 soft pigments 软性颜料 strong wearing (hard) pigments fine screened image 完美的印刷效果 3 耐磨（硬）性颜料
Abbrev Type of screen Description 缩写 筛纹种类 说明 Abbr. Rastertyp Beschreibung R Cross diagonal Form of screen R Kreuzdiagonalraster Nä pfchenform: screen engravings: Cross diagonal screen Stumpfpyramide frustum pyramid 交叉斜纹 HR Hell-Klischograph Wellenfö rmige 筛纹网格版：平 Hell engraver 截头体棱锥 Nä pfchen am HR Hell-engraver Waved screen Umfang engravings at the LR Linienraster Linien am Line screen circumference 圆 Umfang > meist 周上有波浪筛纹 45° LR Line screen Lines at the K Keramikraster Schuppenartige Ceramic screen circumference > 线纹 Struktur 45° most 圆周上 有线纹>45° K Ceramic screen Scaly structure 陶纹 鳞片结构
Printing principle halftone gravure printing
网版印刷原理
• Small screen engravings are stamped into the cylinder (approx. 80 mio per cylinder).印刷辊上刻有微小的筛纹网格（约80,000,000个/辊） • The printing ink fills the screen engravings. 印刷油墨填入网格 • The doctor blade scrapes the surplus ink. 刮墨刀除去多余的油墨 • During printing process the colour from the screen engravings is passed on to the foil. 印刷中辊上的颜色转印至薄膜