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BuKe factory >> Questions >> 紙張變形的原因是什麽

紙張變形的原因是什麽

From:Buke printing factory of China | Author:China Bukeprinting factorybook0755 | Published time: 2020-10-09 | 371 Views | 🔊 Click to read aloud ❚❚ ▶ | Share:
紙張的伸縮率,也稱作紙張的變形量。是指紙張在潤濕和乾燥後尺寸的相對變化。因為衡量尺寸的增減,往往是通過變化後尺寸與試樣原來尺寸的百分率來表示的,所以人們就稱它為紙張的伸縮率

紙張變形的原因是什麽

紙張的伸縮率,也稱作紙張的變形量。是指紙張在潤濕和乾燥後尺寸的相對變化。因為衡量尺寸的增減,往往是通過變化後尺寸與試樣原來尺寸的百分率來表示的,所以人們就稱它為紙張的伸縮率


紙張纖維是一種親水性物質,即因吸收水分而膨脹,因釋放水分而收縮。所以,紙張的變形量主要取決於其纖維的膨脹與收縮。這種變形主要是直線尺寸的改變,其改變的原因是:水分在纖維之間的滲透與消失,使纖維之間發生了相對位移(長度、寬度發生了變化)。膠印用紙一般要求其變形量盡量小,這樣將給印刷質量的提高帶來一定的好處。


由於操作工藝所引起的紙張變形有:


①紙張在印刷之前的弔晾處理不充分,紙張的濕度不適當;


②版面水分掌握得不夠恰當,一般原因是水量過大;


③車間里的溫度和濕度不合適,或者是變化無常;


④對半成品的管理工作,不符合規定。

紙張變形的原因是什麽
紙張變形的原因是什麽

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