White ink with HP indigo

HP Indigo白墨印刷 / White ink with HP Indigo

包裝中的樣本最初由總部設於巴黎的Adrienne Bornstein et Pierre Sponchiado公司設計,使用Colorprint Numerique數位印刷機進行印刷,樣本紙張選用curious Metallics Digital Gold Leaf,印刷六層白墨,表現出卓越的彩色印刷性能。

Invitation[France]
Paper: Curious Metallics Digital Gold Leaf 300g
Printing technique: White ink liquid toner digital printing (HP Indigo),6 passes

 

建議事項
白墨為短版印刷的設計師帶來更多可能性,白墨可作為作品的底色或元素,應用於印刷品中的大面積上色,其出色的彩色印刷效果,可以讓成品更精緻。

  • 請印刷多層白墨,提高白色印刷品的不透明度和亮度,白墨的印刷層數取決於紙張的選擇,一般三到五層,紙張顏色越暗,需要印刷越多層。
  • 在帶有特殊效果的白紙(例如Curious Metallics Digital Ice Silver)上印刷白墨,會產生別緻的效果。
  • 在進行四色印刷前,印刷白墨作為底色可讓顏色更加鮮明。
  • 使用霧面白墨可與紙張產生明顯的反差效果,印刷樣本中可以看到白墨與金屬感紙張的組合。
  • 若要在白墨上印色,請在除色後再使用,因為HP Indigo建議油墨覆蓋率不超過250%。
  • 印刷其他顏色之前,請先透過HP Indigo系統設定進行無圖壓痕的空印,空印可以讓白墨稍微變乾,提高印刷品的質量與穩定性。

注意事項
最新HP Indigo印刷機可以在多款彩色美術紙張上印刷白墨,從蠟紙到彩色濃烈的彩紙均包含在內,但需要經過HP Indigo專用塗佈後,即可適用於HP Indigo數位印刷。

  • 請勿使用HP Indigo系統在沒有塗層的紙上印刷,所有沒有塗層的紙張都必須經由特殊處理,才能具備合格的油墨轉印與吸附特性,尤其在印刷白墨時要注意這點。
  • 在未測試的情況下,請勿印刷過多層的白墨,印刷多層白墨可提高白色印刷品的不透明度與亮度,但會導致網紋或油墨痕跡,印刷多層會導致成本提高,也會限制其他色彩在白墨上的表現。
  • 請勿在沒有在沒有校樣版的情況下進行長版印刷,在印刷白墨時,請務必準備一份校樣版並確保白色擁有足夠的不透明度和亮度,且沒有任何明顯的打印瑕疵後再進行長版印刷。
  • 由於印刷白墨比其他顏色更嚴格,所以若在美術紙張上印刷,請勿忽略HP Indigo的一般印刷建議。

 

DOs
White ink opens up a variety of possibilities for designers who are looking at short run prints.White ink can be used as a base coat or as a white element of design, for fine details-thanks to perfect registration or large areas of a print.

  • DO print multiple layers of white ink to increase the opacity and brightness of the white print.The number of layers needed depends on the substrate being printed, with 3-5 layers in general.Darker coloured papers require many more layers of white ink as a base.
  • DO use white ink as a base coat before printing four colour images in order to obtain more vivid colours.Slightly reducing the white area will avoid it showing around the coloured print.
  • DO consider white ink, which is matt, to create a contrasting visual effect with the paper.White ink marries beautifully with metallic finish paper as can be seen in the printed sample.
  • DO use for colour removal.This is particularly important when using colour on white ink as HP Indigo recommends no more than 250% ink coverage.
  • DO run “null” cycles before and after printing the white ink colour separations.Null cycles are image-less impressions which can be selected on the HP Indigo system.These null cycles dry the white ink slightly prior to printing further colours, which helps improve the quality and uniformity of the print.

DON’Ts
The latest HP Indigo presses can print white ink on a wide range of coloured creative papers, ranging from pastels all the way through to rich, intense colours, provided they are optimised for HP Indigo digital printing.

  • DON’T use standard uncoated offset papers on HP Indigo systems. All uncoated papers have to be specially treated to give acceptable ink transfer and adhesion and this is particularly true when printing white ink.
  • DON’T hesitate to print white ink on white papers.You can achieve beautiful results by printing white ink on white papers with special effects, such as Curious Metallics Digital Ice Silver products.
  • DON’T use multiple layers or white ink without a trial.Multiple layers of white ink used to increase the opacity and brightness of the white print may cause ink reticulation.Multiple layers of white ink will also cost more and will limit the coverage of colours on top of the white ink.
  • DON’T commit without a proof.When printing with white ink always run a proof and check that the white is opaque and bright enough, without any obvious print defects, before committing to a longer run.
  • DON’T overlook general recommendations regarding HP Indigo printing on creative papers when using white ink, as white ink printing tends to be more critical than other colours.

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