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如何判斷印刷紙張的紙紋方向

From:Buke printing factory of China | Author:China Bukeprinting factorybook0755 | Published time: 2020-10-10 | 548 Views | 🔊 Click to read aloud ❚❚ | Share:
對於捲筒紙,紙張的方向性很容易確定,因生產的原因紙張向就是紙捲的圓周方向。而單張紙的方向就不十分明確,除造紙廠專門標註外,就需要仔細確認

如何判斷印刷紙張的紙紋方向


對於捲筒紙,紙張的方向性很容易確定,因生產的原因紙張向就是紙捲的圓周方向。而單張紙的方向就不十分明確,除造紙廠專門標註外,就需要仔細確認



(1)紙頁捲曲法

將測試紙切成50mm×50mm的試樣,並分別對應記錄下紙張的長邊和短邊,然後放在水面上,再觀察紙張的捲曲方,與捲曲軸平行的方向即為紙張的縱向,這樣即可對應確定原紙長邊或短邊的縱橫方向


(2)抗張強度分辨法

通過確定紙張的抗張強度來分辨紙張縱橫向的一種方法,即為抗張強度分辨法。通常,紙張的縱向強度高,耐折度和抗張強度均較大。通過折紙實驗即可很快確定紙張的縱橫方向。在實驗室中,這種方法往往便捷也很可靠。



(3)紙條彎曲法

在測試紙的相互垂直的方向上各取一條200mm×15mm的紙條,將其平行重疊,再用手指捏住一端,使其另一端自由地彎向手指的左方或右方。如果兩個紙條重合,則上面的紙條為橫向;如果兩個紙條分開,則下麵的紙條為橫向



(4)纖維定向鑒別法

即在顯微條件下觀察紙表纖維的排列方向。另外還可以採用膨脹法、翻執法、濕水伸長測定法、水滴法、拉扯法、撕裂法、觀察等方法判斷紙張的縱橫方向。


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如何判斷印刷紙張的紙紋方向
如何判斷印刷紙張的紙紋方向

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