1. Ink summer effect
The fundamental reason for the summer effect of ink is that some changes in ink are caused after the temperature rises. Printing inks are mainly composed of pigments and binders, in addition, there are some fillers and additional materials. The black ink used for newsprint printing usually uses mineral oil as a binder, and the colored ink usually uses vegetable oil as a binder.
After the black ink is printed on the paper, the binder (mineral oil) in the ink is initially on the surface of the paper, but after a period of aging (4-6 months), the mineral oil is almost completely absorbed by the paper due to its The ability to absorb oxygen is poor. The binding material left on the paper is rarely cross-linked, and there is no stiff structure, only some fragile and fragile structures, so many small ink particles are formed.
After the vegetable oil ink is printed on the paper, the binder (vegetable oil) in the ink is also on the surface of the paper at the beginning, but due to its strong ability to absorb oxygen, after a period of aging, part of the vegetable oil is absorbed by the paper, but there are still Many remain on the paper surface and stick together with the pigment. Because vegetable oils have an unsaturated double-chain structure, they can form some cross-linked stiff structures and attach to fibers.
When old newspapers printed with mineral oil inks and vegetable oil inks are broken in a disintegrator, mineral oil inks are easier to shatter than vegetable oil inks, so the eric value after shredding is high (effective residual ink particle concentration) and after sufficient washing, The concentration of irreversible redeposited ink particles in the pulp is also greater, which has a greater impact on the whiteness of waste paper pulp.
2. Ink summer effect on whiteness
The whiteness of Canadian deinked pulp is the lowest from June to August every year. The whiteness of the deinked pulp in the northern United States is the lowest from July to August every year, which is about 1.4% lower than normal. The whiteness of waste paper desizing in our factory is also the lowest from July to August every year. For example, the minimum whiteness pass rate in 1998 was 46.2%, the minimum whiteness pass rate in 1999 was 71.2%, the minimum whiteness pass rate in 2000 was 2.6%, and the minimum whiteness pass rate in 2001 was 11.3%. This shows that no matter which country or region, the summer effect of ink deinking of waste paper is widespread.
bookcase with doors is a type of storage furniture that combines open shelves for displaying books or other items with enclosed compartments behind doors. This design allows you to have both visible display space and hidden storage options. When looking for a bookcase with doors, consider the following factors:
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Size and Space: Measure the available space in your room to ensure the bookcase will fit comfortably. Consider both the width and height of the bookcase, taking into account the clearance needed for opening the doors.
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Design and Style: Bookcases with doors come in various styles, ranging from traditional to modern. Consider the design elements such as the shape, detailing, and finish to ensure it complements your existing decor.
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Material: Choose a bookcase made from a material that suits your style and durability preferences. Common options include wood (such as oak, pine, or walnut), metal, or a combination of materials. Consider the material's durability, maintenance requirements, and compatibility with your existing furniture.
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Door Type: Evaluate the type of doors that the bookcase offers. Common door types include hinged doors, sliding doors, or bi-fold doors. Each type has its advantages in terms of accessibility, space-saving, and aesthetic appeal. Consider which type suits your needs and preferences.
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Storage Capacity: Assess the storage capacity of the bookcase, both in terms of open shelves and enclosed compartments. Consider the number and height of the shelves, as well as the size and configuration of the enclosed compartments. Ensure the bookcase can accommodate the items you plan to store.
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Adjustable Shelves: Look for a bookcase with adjustable shelves. Adjustable shelves allow you to customize the spacing between shelves to accommodate books of different sizes or to create space for larger items. This flexibility can be useful if you have a diverse collection of books or plan to display other objects on the shelves.
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Functionality: Consider the functionality of the bookcase with doors. Evaluate if the doors have locks or magnetic closures if you require additional security or to keep dust away from the items inside. Additionally, check if the bookcase has any additional features like drawers, adjustable feet for stability, or wire management systems.
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