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印刷紙張的性能要求達標要求

來源:http://www.703248.com/   發布時間:2021-12-02
紙張能否順利地高質量地用于印刷,取決于紙張的印刷適性。印刷對紙張的要求是:紙張的色調盡可能地達到同一質地的色澤純度,紙張的塵埃度不得超過允許的范圍,具有最小的透光率,并有保證正常印刷時的機械強度,紙張的厚度、緊度、結構特性等要在同一印刷批量中保持相同,紙邊應為直角且斜度誤差不能超過±3mm。
Whether the paper can be used for printing smoothly and high quality depends on the printability of the paper. The requirements for printing paper are: the color tone of the paper shall reach the color purity of the same texture as far as possible, the dust degree of the paper shall not exceed the allowable range, have the minimum light transmittance, and ensure the mechanical strength during normal printing, and the thickness, tightness and structural characteristics of the paper shall be the same in the same printing batch, The paper edge shall be right angle and the slope error shall not exceed ± 3mm.
紙張的平滑度:紙張的平滑度直接決定著印刷品的印刷品質。平滑度高的紙張在壓印時,能較好地與版面進行接觸,使印版上的油墨層能夠均勻地轉移到紙面上,平滑度低的紙張,會因為印刷時表面的不平整,造成壓印時版面與紙張的表面接觸不均勻,使油墨層的轉移到紙面上進呈現不均勻的現象,如碰上平滑度較低的紙張,可以在印刷時適當地加大印刷時的壓力,可以適當地彌補因其表面不平而出現的印跡發虛的現象。
Smoothness of paper: the smoothness of paper directly determines the printing quality of printed matter. The paper with high smoothness can better contact with the layout during embossing, so that the ink layer on the printing plate can be evenly transferred to the paper surface. The paper with low smoothness will cause uneven contact between the layout and the surface of the paper during embossing due to the uneven surface during printing, so that the transfer of the ink layer to the paper surface is uneven, such as touching the paper with low smoothness, The pressure during printing can be appropriately increased, and the phenomenon of false imprinting due to uneven surface can be appropriately compensated.
紙張的吸墨性:紙張對油墨的吸收,主要取決于紙張的纖維間的緊密程度(空隙的大?。?。當紙張纖維間的空隙小時,因帚化纖維過少,使纖維毛細管的作用受到影響,造成紙張對油墨的吸收性降低;如果紙張纖維間的空隙過大,會因吸收連接料過多而造成油墨顏料一并被吸收,使印刷品出現透印的現象。
Ink absorption of paper: the absorption of ink by paper mainly depends on the tightness between the fibers of the paper (the size of the gap). When the gap between paper fibers is small, there are too few broomed fibers, which affects the function of fiber capillary and reduces the absorption of paper to ink; If the gap between the paper fibers is too large, the ink and pigment will be absorbed together due to excessive absorption of connecting materials, resulting in the phenomenon of through printing of the printed matter.
濟南畫冊印刷
紙張的彈性和塑性:紙張在屯放、印刷等各種過程中,會因為周邊環境的不同而發生各種變化。如在外力的作用下,會瞬時地改變自己的形狀和尺寸,而當外力停止時,紙張又會恢復到原來的形狀和尺寸,這種變形的過程稱為敏彈性變形;當紙張受到外力時在一定期捍間間隔內改變了自己的形狀和尺寸,外力停止作用時則慢慢地恢復到原來的形狀和尺寸,這種變形的過程稱為滯彈性變形;當外力取消之后,紙張還是保持在受外力作用時造成的形狀與尺寸變形的狀態時,稱為塑性變形。敏彈性變形、滯彈性變形是一種可逆性的變形,而塑性變形是不可逆的變形。
Elasticity and plasticity of paper: paper will change due to different surrounding environment in various processes such as storage and printing. For example, under the action of external force, it will change its shape and size instantaneously, and when the external force stops, the paper will return to its original shape and size. This deformation process is called sensitive elastic deformation; When the paper is subjected to external force, it changes its shape and size within a certain interval. When the external force stops, it slowly returns to its original shape and size. This deformation process is called anelastic deformation; When the external force is cancelled and the paper remains in the state of shape and size deformation caused by external force, it is called plastic deformation. Sensitive elastic deformation and anelastic deformation are reversible deformation, while plastic deformation is irreversible deformation.
紙張的表面強度:紙張的表面強度決定著紙張在印刷時其表面的耐磨性、抗掉粉、抗起毛等有決定性的影響。印刷時為了得到較為清晰的網點,會采用一些粘度較高的油墨,如果紙張的表面強度不夠,就會容易掉粉、掉毛現象,并粘附在版的表面;如果使用較低粘度的油墨,在平版印刷中,會因油墨與潤版液乳化,從而造成印版空白的地方污臟。
Surface strength of paper: the surface strength of paper determines the wear resistance, powder dropping resistance and fuzzing resistance of the surface of paper during printing. In order to obtain a clearer dot during printing, some inks with high viscosity will be used. If the surface strength of the paper is not enough, it will be easy to lose powder and hair, and adhere to the surface of the plate; If the ink with lower viscosity is used, the blank of the printing plate will be dirty due to the emulsification of the ink and the fountain solution in lithography.
紙張的含水量:紙張的含水量的多少,直接影響著印刷品的質量,含水量過多,紙張的強度會降低,在外力的作用下,紙張纖維會被拉出,使塑性變形增強,使印跡的干燥速度受到影響;如含水量過少,紙張會發脆,容易造成破損,產生靜電等。由于紙張的含水量與周圍的環境有很大的相關性,所以對于印刷機房的濕度和溫度都要進行恰當的安排,以保持紙張含水量的平衡。
Water content of paper: the water content of paper directly affects the quality of printed matter. If the water content is too much, the strength of paper will be reduced. Under the action of external force, the paper fiber will be pulled out to enhance the plastic deformation and affect the drying speed of imprinting; If the water content is too low, the paper will be brittle, easy to cause damage and generate static electricity. Due to the great correlation between the water content of the paper and the surrounding environment, the humidity and temperature of the printing room should be properly arranged to maintain the balance of the water content of the paper.
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