What should we pay attention to when purchasing various types of paper products in our factory?

writing paper

Paper quality:

Whiteness and color: the whiteness should be moderate. If it is too high, too much fluorescent whitening agent may be added, which will affect the visual effect and health of writing. Generally, the whiteness should be 80%-90%, and the color should be uniform to avoid the inconsistency of macula or gray scale.

Smoothness: for pen writing, smoothness is required, and touching the paper surface with hands should feel delicate. Paper with poor smoothness will lead to pen tip wear and uneven ink penetration, which can be detected by a professional smoothness tester, and the value is suitable between 20-50 seconds.

Strength and toughness: the paper can't be easily damaged during writing, and it needs a certain tensile strength. Generally, the breaking length is about 3,000-5,000m, and the folding endurance (double folding times) is not less than 5 times.

Specification adaptation:

Size: Choose the appropriate size according to the actual use, such as A4, A3, B5, etc. Make sure that the paper size meets the requirements of printers, copiers or writing stationery.

Thickness (gram weight): the gram weight is generally 60-80g/m2. If it is too thin, it is easy to penetrate ink; if it is too thick, it will increase the cost and make it inconvenient to bind. For example, 60-70g/m2 of paper is enough for ordinary office writing, and 70-80g/m2 is more suitable for documents that need to be written on both sides.

Printing paper (copy paper)

Print adaptability:

Ink absorbability: the paper should be able to absorb ink or carbon powder well, so that the printed handwriting or pattern is clear and firm. Through the printing test, observe the effect after printing, and there should be no blurring, powder dropping and other phenomena.

Paper jam probability: this is the key factor to pay attention to when purchasing printing paper. Stiffness and static electricity of paper will affect the probability of paper jam. The paper with moderate stiffness can pass through the paper path of the printer smoothly, and the paper with small static electricity is not easy to adsorb together and cause paper jam. Stiffness can be measured by a stiffness meter. Generally, the longitudinal stiffness is about 70-100mN, and the lateral stiffness is about 30-50mN.

Optical properties and stability:

Whiteness and glossiness: It is better to keep the whiteness at 90%-95% and the glossiness should be even, which can make the printed colors more vivid and true. Too high gloss may cause reflection and affect reading. Generally, the gloss is between 20% and 30%.

Dimensional stability: In the printing process, the paper cannot be obviously deformed due to heat or moisture. Its expansion rate should be controlled within 0.5% to ensure the alignment accuracy of printing.

wrapping paper

Protection performance:

Strength and toughness: the paper used for packaging products should be able to withstand certain pressure and friction to prevent the products from being damaged during transportation and storage. For example, the edge crush strength of corrugated paper is high, generally, the edge crush strength of single corrugated paper is not less than 4000N/m, and the edge crush strength of double corrugated paper is not less than 7000 N/m..

Moisture-proof: If the packaged products are sensitive to humidity, such as food and electronic products, the packaging paper should have good moisture-proof performance. By coating the paper surface with moisture-proof coating or selecting a paper material with moisture-proof performance, such as aluminum foil composite paper, its water vapor permeability is extremely low, which can effectively protect the product.

Appearance and printability:

Color and texture: Choose the color and texture of the wrapping paper according to the product positioning and brand image. For example, the wrapping paper of high-grade products can choose glossy and delicate paper, while the wrapping paper of environmental protection products may prefer to choose paper with natural color and texture.

Printability: If you need to print product information, patterns, etc. on the packaging paper, you should consider the printability of the paper. The surface roughness and ink absorption of paper will affect the printing effect. For example, coated paper has a smooth surface and good ink absorption, which is suitable for printing high-quality color patterns, while the printing effect of kraft paper is more natural and simple.

toilet paper

Health and safety standards:

Quality of raw materials: The raw materials of toilet paper are mainly wood pulp or bamboo pulp. High-quality raw materials are the basis to ensure the quality of toilet paper, and harmful chemicals and impurities should be avoided. For example, the quality of toilet paper produced by virgin wood pulp is better, while the toilet paper produced by recycled fiber may contain more bacteria and impurities.

Microbiological indicators: To meet the relevant national hygiene standards, the total number of bacterial colonies should not exceed 600CFU/g and the total number of fungal colonies should not exceed 100CFU/g, and pathogenic pyogenic bacteria should not be detected.

Usage performance:

Softness and water absorption: Softness is an important index to measure the comfort of toilet paper, and you can obviously feel the softness of paper by touching it with your hands. Strong water absorption, generally the horizontal liquid absorption height is not less than 30mm/10min, so as to ensure a good wiping effect.

Strength and no chipping: In the process of use, toilet paper should not be easily broken, and at the same time, the phenomenon of chipping should be minimized. It can be evaluated by simple pulling and wiping tests, and the paper should have a certain tensile strength, and there is basically no paper residue on the hands after wiping.