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印刷纸张的性能要求达标要求

来源:http://www.xinfengyinshua.cn/   发布时间:2021-12-02
纸张能否顺利地高质量地用于印刷,取决于纸张的印刷适性。印刷对纸张的要求是:纸张的色调尽可能地达到同一质地的色泽纯度,纸张的尘埃度不得超过允许的范围,具有最小的透光率,并有保证正常印刷时的机械强度,纸张的厚度、紧度、结构特性等要在同一印刷批量中保持相同,纸边应为直角且斜度误差不能超过±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.
纸张的平滑度:纸张的平滑度直接决定着印刷品的印刷品质。平滑度高的纸张在压印时,能较好地与版面进行接触,使印版上的油墨层能够均匀地转移到纸面上,平滑度低的纸张,会因为印刷时表面的不平整,造成压印时版面与纸张的表面接触不均匀,使油墨层的转移到纸面上进呈现不均匀的现象,如碰上平滑度较低的纸张,可以在印刷时适当地加大印刷时的压力,可以适当地弥补因其表面不平而出现的印迹发虚的现象。
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.
纸张的吸墨性:纸张对油墨的吸收,主要取决于纸张的纤维间的紧密程度(空隙的大小)。当纸张纤维间的空隙小时,因帚化纤维过少,使纤维毛细管的作用受到影响,造成纸张对油墨的吸收性降低;如果纸张纤维间的空隙过大,会因吸收连接料过多而造成油墨颜料一并被吸收,使印刷品出现透印的现象。
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.
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纸张的弹性和塑性:纸张在屯放、印刷等各种过程中,会因为周边环境的不同而发生各种变化。如在外力的作用下,会瞬时地改变自己的形状和尺寸,而当外力停止时,纸张又会恢复到原来的形状和尺寸,这种变形的过程称为敏弹性变形;当纸张受到外力时在一定期捍间间隔内改变了自己的形状和尺寸,外力停止作用时则慢慢地恢复到原来的形状和尺寸,这种变形的过程称为滞弹性变形;当外力取消之后,纸张还是保持在受外力作用时造成的形状与尺寸变形的状态时,称为塑性变形。敏弹性变形、滞弹性变形是一种可逆性的变形,而塑性变形是不可逆的变形。
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.
纸张的表面强度:纸张的表面强度决定着纸张在印刷时其表面的耐磨性、抗掉粉、抗起毛等有决定性的影响。印刷时为了得到较为清晰的网点,会采用一些粘度较高的油墨,如果纸张的表面强度不够,就会容易掉粉、掉毛现象,并粘附在版的表面;如果使用较低粘度的油墨,在平版印刷中,会因油墨与润版液乳化,从而造成印版空白的地方污脏。
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.
纸张的含水量:纸张的含水量的多少,直接影响着印刷品的质量,含水量过多,纸张的强度会降低,在外力的作用下,纸张纤维会被拉出,使塑性变形增强,使印迹的干燥速度受到影响;如含水量过少,纸张会发脆,容易造成破损,产生静电等。由于纸张的含水量与周围的环境有很大的相关性,所以对于印刷机房的湿度和温度都要进行恰当的安排,以保持纸张含水量的平衡。
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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