一、外观质量
1、 Appearance quality
外观质量指尘埃、孔洞、针眼、透明点、皱纹、褶子、条痕、网印、毛布痕、斑点、浆疙瘩、云彩花、裂口、色泽不一致等肉眼可以观察到的缺陷。
Appearance quality refers to defects that can be observed by the naked eye, such as dust, holes, pinholes, transparent spots, wrinkles, folds, streaks, screen prints, woolen marks, spots, bumps, clouds, cracks, and inconsistent colors.
二、力学性质
2、 Mechanical properties
力学性质又称为机械性质或强度性质，它又分为静态强度和动态强度两种。
Mechanical properties, also known as mechanical properties or strength properties, are divided into two types: static strength and dynamic strength.
静态强度是纸张在缓慢受力的情况下所能承受的大力，又称为终强度。它包括下面几个质量指标：抗张强度、耐破度、撕裂度、耐折度、挺度等。
Static strength is the strong force that a paper can withstand under slow force, also known as final strength. It includes the following quality indicators: tensile strength, burst resistance, tearing resistance, folding resistance, stiffness, etc.
动态强度是指纸张能经受瞬时冲击的强度，它反映了纸张受力后瞬时扩散的动态情况。动态强度主要包括下面几个指标：戳穿强度、环压强度、压缩强度等，这是包装用纸和纸板重要的质量指标。-印刷信封
Dynamic strength refers to the strength of a paper that can withstand instantaneous impact, which reflects the dynamic diffusion of the paper after being subjected to force. The dynamic strength mainly includes the following indicators: puncture strength, ring compression strength, compression strength, etc., which are important quality indicators for packaging paper and paperboard- Printing Envelopes
三、基本物理性质
3、 Basic physical properties
基本物理性质包括纸张的定量、厚度、紧度、平滑度、硬度、松软度、可压缩性、吸收性等纸张为普遍的性能。
The basic physical properties of paper include quantity, thickness, tightness, smoothness, hardness, softness, compressibility, absorbency, and other common properties of paper.
四、化学性质
4、 Chemical properties
纸张的化学性质包括纸张的化学组成、纸张的吸湿性、灰分、施胶度、酸碱性、耐久性。
The chemical properties of paper include its chemical composition, moisture absorption, ash content, sizing degree, acidity and alkalinity, and durability.
五、光学性质
5、 Optical properties
光学性能指白度(亮度)、色泽度、光泽度、透明度、不透明度等。对印刷纸张来说，纸张的光学性能是十分重要的，它直接影响着印刷品的质量。
Optical performance refers to whiteness (brightness), chromaticity, glossiness, transparency, opacity, etc. For printing paper, the optical performance of the paper is very important, as it directly affects the quality of the printed product.
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