一、外觀質量
1、 Appearance quality
外觀質量指塵埃、孔洞、針眼、透明點、皺紋、褶子、條痕、網印、毛布痕、斑點、漿疙瘩、云彩花、裂口、色澤不一致等肉眼可以觀察到的缺陷。
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、力學性質
2、 Mechanical properties
力學性質又稱為機械性質或強度性質，它又分為靜態(tài)強度和動態(tài)強度兩種。
Mechanical properties, also known as mechanical properties or strength properties, are divided into two types: static strength and dynamic strength.
靜態(tài)強度是紙張在緩慢受力的情況下所能承受的大力，又稱為終強度。它包括下面幾個質量指標：抗張強度、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.
動態(tài)強度是指紙張能經受瞬時沖擊的強度，它反映了紙張受力后瞬時擴散的動態(tài)情況。動態(tài)強度主要包括下面幾個指標：戳穿強度、環(huán)壓強度、壓縮強度等，這是包裝用紙和紙板重要的質量指標。-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、基本物理性質
3、 Basic physical properties
基本物理性質包括紙張的定量、厚度、緊度、平滑度、硬度、松軟度、可壓縮性、吸收性等紙張為普遍的性能。
The basic physical properties of paper include quantity, thickness, tightness, smoothness, hardness, softness, compressibility, absorbency, and other common properties of paper.
四、化學性質
4、 Chemical properties
紙張的化學性質包括紙張的化學組成、紙張的吸濕性、灰分、施膠度、酸堿性、耐久性。
The chemical properties of paper include its chemical composition, moisture absorption, ash content, sizing degree, acidity and alkalinity, and durability.
五、光學性質
5、 Optical properties
光學性能指白度(亮度)、色澤度、光澤度、透明度、不透明度等。對印刷紙張來說，紙張的光學性能是十分重要的，它直接影響著印刷品的質量。
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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