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Method for Determining the Direction of Paper Grain

Method for Determining the Direction of Paper Grain

As the primary material used in printing, paper’s performance plays a crucial role in determining print quality and the success of post-printing processes. Among the many properties of paper, the direction of grain—also known as the fiber direction—is a particularly important physical characteristic. The grain direction refers to the predominant alignment of fibers within the paper. This direction significantly influences the paper’s physical properties, including but not limited to tear resistance, curling, and dimensional stability. Here, we will introduce several methods for detecting the grain direction of paper. Each of these methods has its own unique characteristics and is suited to different applications and precision requirements.

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2024

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07

How to reduce the impact of paper fiber flow

How to reduce the impact of paper fiber flow

As the primary substrate material in printing production, the quality of paper directly determines both the print quality and the feasibility of post-printing processes. Among the many properties of paper, the direction of grain is a critically important factor. The grain direction not only affects the physical characteristics of the paper but also directly influences the accuracy of image and text registration during the printing process, the stability of paper feed, and the final quality of post-printing products. Therefore, a thorough understanding and mastery of the characteristics of paper grain direction and its impact on printing and processing are of great significance for enhancing print quality and improving production efficiency.

27

2024

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07

The impact of silk flow on paper properties

The impact of silk flow on paper properties

The grain direction of paper refers to the predominant orientation of paper fibers on the sheet. During the manufacturing process of machine-made paper, as the pulp is spread onto the moving wire mesh to form the paper web, the fibers tend to align in a general direction dictated by the flow of the pulp. This directional alignment is known as the grain direction. The grain direction is an important characteristic in the paper-making process, significantly influencing the paper’s performance, print quality, and post-printing processing.

26

2024

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07

The concept of wire marks on printed paper

The concept of wire marks on printed paper

The grain of paper, simply put, refers to the predominant orientation of fibers within the paper. During mechanical papermaking, pulp is evenly sprayed onto a continuously moving wire mesh. As moisture gradually evaporates from the pulp and fibers interweave with one another, a sheet of paper with sufficient strength and toughness is ultimately formed. In this process, the direction of pulp flow determines the general alignment of the fibers; this directional alignment is known as the grain direction of the paper.

25

2024

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07

The curing principle of saturated polyester resin

The curing principle of saturated polyester resin

Saturated polyester resin is an extremely important polymer material that plays an indispensable role in numerous industrial sectors. The chemical composition of saturated polyester resin is complex and highly refined; its core raw materials primarily revolve around diols and dicarboxylic acids. These two components undergo a polycondensation reaction to form the resin’s basic skeletal structure. In addition, to tailor specific properties of the resin or enhance its functionality, triols (such as trimethylolpropane and trimethylolethane) or other monoalcohols and monocarboxylic acids may also be introduced as auxiliary ingredients. When selecting raw materials, we can make choices based on the intended application area of the polyester resin and the performance characteristics required. For instance, among aromatic dicarboxylic acids, isophthalic acid is more favored than its counterparts, such as orthophthalic acid, in the synthesis of polyester resins due to its outstanding resistance to salt spray, chemical corrosion, and superior water resistance. As a result, isophthalic acid is widely used in applications where high resin performance is critical. This strategic selection approach ensures that saturated polyester resins can meet the diverse demands of the market.

24

2024

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07

Modification methods for epoxy resins

Modification methods for epoxy resins

Epoxy resins have established a prominent position in numerous fields thanks to their outstanding overall mechanical properties, strong adhesion, low shrinkage, excellent stability, and superior electrical insulation performance. However, after curing, the highly cross-linked molecular structure of epoxy resins leads to increased internal stresses, resulting in limitations such as high brittleness, poor fatigue resistance, inadequate thermal stability, and weak impact toughness. These inherent shortcomings restrict the broader application scope of epoxy resins. To overcome these limitations, many technicians have conducted extensive research on epoxy resin modification, striving to improve its brittleness, enhance its fatigue resistance, boost its thermal stability, and increase its impact toughness through innovative modification methods and technological approaches. By doing so, they aim to expand the application areas of epoxy resins and meet increasingly diverse needs.

23

2024

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07

Structural Classification of Modified Epoxy Resins

Structural Classification of Modified Epoxy Resins

Modified epoxy resins, as an important class of polymeric materials, can significantly enhance their performance through chemical or physical modifications to the base epoxy resin, thereby meeting a broader range of more specific application requirements. The classification of modified epoxy resins is primarily based on their chemical structural characteristics and the manner in which epoxy groups are incorporated. This classification approach aims to distinguish between different types of modified epoxy resins, facilitating a better understanding of their properties, applications, and the chemical changes that occur during the modification process. By taking into account differences in chemical structure—such as the composition of the main chain, functional groups on side chains, crosslinking density, and how epoxy groups bond with other molecules or functional groups—it becomes possible to systematically categorize and analyze modified epoxy resins.

22

2024

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07

The Importance of Coating Application Viscosity

The Importance of Coating Application Viscosity

Viscosity has a direct impact on the application performance of coatings. During application, if the viscosity of a coating is too high, it becomes more difficult to apply because high viscosity implies greater internal resistance and poor flowability. This can lead to uneven coating application, resulting in brush marks or sagging. Conversely, if the viscosity of the coating is too low, although it flows easily, the coating may fail to adhere properly to the substrate, run excessively, or form an overly thin film, thereby compromising both the protective performance and aesthetic appeal of the coating.

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2024

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07

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