Why is paper separated into classes and application categories?

As the classification of copy paper is rather arbitrary, the international paper business lacks unified codes and standards for copy paper varieties. There is no comprehensive criteria for classification and every manufacturer introduces his own regulations (А, В, С, А+, В++, Д, etc.).
JSC “Mondi SLPK” produces paper for office equipment following the organization standard STO 00279404-001-2013 (as amended by №1). To obtain further information on paper classes go to the 'Characteristics' section.
In 2018 a national standard GOST for office paper types was issued. This document is to regulate paper classes (varieties).

What are the basic technical characteristics of paper?

Key characteristics of copy paper include thickness, moisture content, opacity and brightness.
Paper thickness is defined as the perpendicular distance between two opposite surfaces of a sheet. Thickness is one of the most important properties and affects many things, including bending resistance. In turn, bending stiffness influences the passage of paper through the printer. Thin paper often shows low resistance. It runs the risk of jamming while paper passes through the office equipment.
High thickness paper is more rigid. Its relative stiffness also increases the risk of jams, since paper cannot bend properly when it goes around shafts, drums, photoreceptors, rollers and turning areas. For standard 80 g office paper, sufficient thickness is at least 100 microns.
The moisture content is the amount of water in the paper. Moisture content is an important factor as moisture affects processing, printing and copying.
With the electrographic (xerographic) printing method, the paper is heated when toner is fixed. Therefore, if the moisture content exceeds 5.3%, the paper tends to curl and wave. It prevents double-sided printing and negatively impacts the quality of printed documents.
Moisture content also directly affects the electrical conductivity of paper. and influences its resilience. 4.0–5.2% is the best moisture content range for office papers.
Opacity. Double-sided printing requires opaque paper. The opacity of paper should be at least 90% to ensure the desired result, i.e. to let through almost no light, so that the text or other visual elements on one side of a sheet are not visible on the reverse side.
Brightness. Brightness refers to the capacity of paper to reflect equally all the colors of the spectrum. Paper is supposed to reflect light from all wavelengths of the entire visible spectrum.
If a sheet of paper is really white, it has high reflectivity. In this case, it absorbs waves of different length equally.
The whiteness value is determined in accordance with the requirements of the International Commission on Illumination (CIE) and corresponds to the visual perception of white paper, whether or not it contains fluorescent whitening substances observed with a daylight source (for example, C / 2 ° or D65 / 10 °).
All measurements of optical characteristics are directly dependent on the light source and the observer. The light source is standardized according to temperature value (“temperature of light”) defined in Kelvins (K). Since natural daylight is characterized by a non-constant spectrum, which depends on time, place, weather, and other case-specific factors, standard daylight sources have been designed to ensure compliance with reproducible conditions.

Why does Snegurochka offer optimal solutions?

As production of high-quality types of paper in Russia is traditionally associated with JSC "Mondi SLPK", improvement of product quality has always been a priority for the company. Manufactured on modern equipment, Snegurochka paper is made from high-quality raw materials and all necessary components. Our close control of the entire technological chain, high proficiency of technical experts, continuously evolving technology, quality improvement and adherence to environmental regulations enable our company to produce office equipment paper that meets international standards. While producing Snegurochka paper, we use only cellulose fiber with high resistance to light and long-term protection against fading. Snegurochka paper offers incredible versatility since it is designed for printing on laser and inkjet printers, copiers and MFP.

How does the paper protect equipment and prolong its life?

Snegurochka office paper is treated with surface sealants (polymer coating). Binders are applied to strengthen the bonds between fibres and increase paper stiffness. Glueing the fibres together, these substances increase the internal strength of the paper, eliminate dusting and the flaking of occasional fibers. The surface coating improves the physical, mechanical, printing and absorption properties of paper. In addition, the high-quality raw materials used in manufacturing Snegurochka and strict control over the content of resins and other inclusions guarantee a long life for your office equipment.

What is important to know about ECF bleaching?

Our company applies ECF technology while bleaching softwood and hardwood pulp (bleaching without elemental chlorine gas, Elemental Chlorine Free). The process of bleaching pulp occurs through the use of chlorine dioxide and oxygen-based bleachers. The introduction of ECF technology for pulp bleaching is primarily focused on environmental protection. It leads to:

- Reduction of highly toxic compounds (chlordioxin) in wastewater.

- Significant reduction in freshwater consumption.

- Higher general industrial safety of the production facility and nearby settlements.

- Production of cardboard and paper which meet strict international environmental standards of the global pulp and paper industry.

How many sheets are there in a ream?

While manufacturing sheet products, we pack paper in reams with 500 sheets per unit. Permissible tolerance should not exceed ± 1% of the norm. These requirements are fixed in the copy paper regulations, section 4.3 Packaging.
Format cutting lines are supposed to pack 500 sheets in a ream. Some reams have 498 sheets because 6 parent rolls supply paper for two production lines. Therefore, the number of sheets in a ream is a multiple of 6. If you check more reams, you will find some with 504 sheets. Thus, the number of sheets in paper reams can be 498, 500 or 504.

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