Learn More About White Cardboard Paper Knowledge
White cardboard, a paper material that is widely used in our daily life and many industries. So, how much do you know about white cardboard? In this article, we will explore various aspects of white cardboard in depth and take you to have a deep understanding of the knowledge related to white cardboard.
Classification of white cardboard
White cardboard is made entirely of chemically bleached wood pulp as raw material, with a quantitative range of 150g/㎡~400g/㎡, and has small elasticity, good toughness, high folding resistance, uniform fiber structure, and good ink absorption performance. At the same time, white cardboard has good printing performance, can clearly present various colors and patterns, has high color reproduction, and is suitable for printing.
In addition, it also has high stiffness and burst resistance, the paper surface is flat and smooth, with high whiteness and good gloss, giving people a clean and elegant feeling. It has moderate thickness, can withstand certain pressure and folding, and is not easy to deform. White cardboard has a single-layer structure and a multi-layer structure, which makes the formula (long and short fiber ratio and layer structure) more diverse, and the characteristics of white cardboard are also diverse.
From the national standard, we can understand the basic performance requirements of white cardboard, including the quantitative (gram weight) and thickness of the main quality control indicators, as well as the gloss, brightness, whiteness, color, smoothness, printing surface roughness, Cobb surface water absorption/ink absorption, PPS printing surface strength, and internal bonding strength related to the surface and printing. Stiffness (bending stiffness), tear strength, folding resistance, etc. related to brand packaging applications. These packaging-related properties will be reflected in products such as hanging, pressure protection products, multiple opening and closing, etc.
According to demand, white cardboard can be divided into cigarette cards, food cards, social cards, copper cards, etc.
Cigarette cards are mainly used for domestic cigarette box packaging. When manufacturing cigarette cards, more attention should be paid to the adaptability of cigarette cards in roll gravure printing and high-speed processes.
Food cards are mainly used for various food packaging, with high safety requirements, and can include liquid packaging base paper, roof packaging base paper, paper cup base paper, instant noodle bowl outer paper, etc.
Social cards are commonly used in products such as pharmaceuticals, electronic products, cosmetics and other mass consumer goods packaging. There are also natural color pulp and bleached pulp combined into coated cow cards, which are mostly used for heavy packaging and cluster packaging.
Copper cards are widely used in the production of clothing tags, book and magazine covers, advertising, business cards, postcards, greeting cards, desk calendars, playing cards, game cards, etc.
In addition, with the diversification of brand personalization and supporting designs, uncoated white cardboard and lightly coated white cardboard have also been favored by designers and the market. They are currently widely used in packaging, clothing tags, business cards, greeting cards, desk calendars, etc. Uncoated white cardboard is therefore called art card or art white card.
Choice of white cardboard
Users often consider the price when using white cardboard, and will also make choices based on naked eye observation, experience judgment and proofing needs. But it is always "inaccurate" to observe the appearance of white cardboard alone. The main reason is that the human eye is greatly affected by external light sources. Compared with the standard numerical reading of electronic sensors under standard conditions, subjective judgment is incapable of doing so.
The whiteness of paper is the basis for accurately presenting printed colors. The whiteness of printing paper plays a decisive role in the hue, brightness and saturation of the printed colors presented. In printing, since the whiteness of paper required for different printed products is different, it is necessary to choose the right paper for color tracking and printing to ensure better printing color quality.
The following measures should be taken when storing white cardboard:
I.Environmental requirements
1. Temperature and humidity control
White cardboard should be stored in a dry and well-ventilated environment. The suitable temperature is generally between 15℃-25℃, and the relative humidity is preferably controlled at 50%-60%. Excessive humidity will cause white cardboard to absorb moisture, causing it to soften, deform, and even develop mildew spots; and too high or too low temperature may also affect the performance of the paper.
2. Avoid direct sunlight
Ultraviolet rays in sunlight will make white cardboard yellow and brittle, so it should be stored in a dark place. You can choose to place it in a dark corner of the warehouse or use a blackout cloth to block it.
II. Packaging and stacking
1. Original packaging storage
If the white cardboard is newly purchased, try to keep the original packaging, because the original packaging usually has a certain moisture-proof, dust-proof and protective effect.
2. Stacking method
White cardboard should be stacked horizontally, avoid tilting or vertical storage to prevent paper deformation. The stacking height should not be too high to avoid excessive pressure on the bottom paper. At the same time, the stability of the stacking should be maintained to prevent collapse.
3. Regular inspection
(1) Check the humidity
Use a hygrometer to check the humidity of the storage environment regularly to ensure that it is within the appropriate range. If the humidity is too high, dehumidification equipment can be used for dehumidification.
(2)Check the state of the paper
Check the appearance of the white cardboard regularly to see if there is any discoloration, deformation, mildew, etc. If there is any problem, deal with it in time.
Through the above measures, the white cardboard can be effectively preserved, its service life can be extended, and it can be ensured that it can maintain good performance during use.
In short, white cardboard occupies an important position in many fields with its unique characteristics. It not only provides high-quality material options for product packaging and cultural supplies, but also adds more creativity and beauty to fields such as advertising. As people's requirements for quality and beauty continue to increase, the application prospects of white cardboard will be broader.
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