White of office paper. Blueprint paper technical specifications Printing is not that simple and RGB does not work here

03.04.2020

One of the main technical characteristics of paper is undoubtedly its whiteness. It is measured in CIE units by the name of the French Institute of Photometry - Comision Internationale de LEclairage ... But in order not to get confused in the concepts of brightness, lightness or whiteness used, let's make a small digression. Any light is an electromagnetic wave emitted by a source of natural origin, for example the sun or other kind of exciter, such as an incandescent light bulb, etc. The transmitted electromagnetic waves have different lengths and are perceived by us only partially. We cannot see ultraviolet or infrared radiation, and some sound waves... Newton was the first to refract a ray of light through a prism and deduced the range of the visible spectrum for the human eye from red to violet: KOZHZGSF. At this level, we perceive colors and their shades. Our eye is designed in such a way that it reads the number of reflected waves from objects and, at the command of the brain, recodes them into shape and color. This is how we determine the geometry, the level of visibility and other qualities of an object. Different materials have different properties of reflecting electromagnetic waves. Some reflect them well, others poorly, some reflect partially. As a result, we get a completely different picture of impulses returned from the object to the retina.

In a practical way, it was revealed that each color has its own length of electromagnetic wave, therefore, the reflection or absorption of a particular frequency saturates the brain with the corresponding color. For example, with uniform reflection of all waves equally, we see white color and vice versa, when completely absorbed, black. Our retina is designed in such a way that “rods” are responsible for the monochrome section, and “cones” are responsible for color perception. If the lighting is insufficient, the organs responsible for the black and white image work and vice versa, when active lighting appears, the latter are turned off and the cells responsible for the color work. Moreover, those same "cones" understand only three colors - these are red, green and blue. Here it is not difficult to recall the device of a color TV, where three RGB color guns, when combined, make the entire gamut of reproducible colors. Black is missing, but it initially has the color of the screen.

Not everything is so simple in print, and the RGB scheme does not work here:

The fact is that the initial medium for printing is paper, and it is initially white (in our case, we are considering printing on white paper). This means that the plane of the printed sheet itself will reflect the electromagnetic waves. We get a reflected image after absorbing part of the spectrum with a paper sheet. When watching TV or a monitor, on the contrary, we get a direct image directed to our retina.

So, we come to the most interesting:

As we already know, a different CMYK color scheme is used for printing - cyan, magenta, yellow and black. The point is that mixing different colors with each other gives us a certain result: for example, when mixing yellow and blue, it turns out green, and our brain does not distinguish the color created during the synthesis from the electromagnetic wave of the original origin. Blue neutralizes yellow, red neutralizes green, etc. in a circle, yellow neutralizes blue and green neutralizes red. Also with paper, its whiteness depends on the constituent components in its manufacture. We know that cellulose contains a substance called legnin, which is yellow in color. Without bleaching, our paper looks brown and is used in cardboard making. It is inconvenient to write and use such a composition. Therefore, various bleaches are used in the production. Including, drugs are added that most well reflect the waves of the so-called blue spectrum, absorbing yellow. As an example, in everyday life we \u200b\u200buse blue for bleaching bed linen.

And now about the essence of our question, whiteness:

Returning to the concept of whiteness, we mean the reflection from the printed sheet over the entire plane at the same time the total quantity (quality) of the incident light or electromagnetic waves. Our brain perceives this as white or a color with shades of white. In order for our eye to perceive white, the same blue additives are used in priority, neutralizing yellowness, including fluorescent ones, which reflect more rays than hitting the plane. It is no coincidence that the CIE whiteness parameter is measured as a percentage and, as a rule, is more than 100% - for example, paper has a CIE whiteness of 146%, Ballet Classic 153%, and Ballet Premier 161%. We already know how this is possible. A few words about the essence of measuring this parameter. It was revealed empirically, using a photometer device by comparison with a reference sample. The developers of the method were French scientists from the institute indicated above, after which the unit of measurement is named.

Brightness is measured as a percentage of ISO:

Brightness is determined by measuring the reflection of one wave of blue, which, as we already know, neutralizes yellow. This parameter is also measured as a percentage and does not go beyond 100%. It is measured in ISO units - the units of the generally accepted standard of measurement quality. For example, the brightness of the Svetocopy paper ISO \u003d 95%, respectively, the higher this figure, the more contrast the printed sheet looks. The highest reflection in the blue spectrum makes the perception of monochrome prints clearer.

Therefore, for printing office documents, mainly carried out on monochrome printers brightness is more important than whiteness ... And when printing photographs or color printing, a more neutral medium is required to convey the entire palette of colors, without emitting any light wave. For printing photographs, paper with a high whiteness value is used, not brightness.

To determine the technical characteristics, consisting of such parameters as: whiteness, density, opacity and others, it is customary to use the international scale of values \u200b\u200bA +, A, B, C, C +. Thus, the popular office paper Svetocopy according to this classification is classified as class C. Other popular brands are arranged as follows:

Paper classification:

1. The first place is occupied by luxury paper of A + class Ballet brilliant ... The main indicators reveal excellent qualities for:

Whiteness - 168% CIE (svetocopy 146%) Thickness - 113 md (svetocopy 104 md) Density - 82 g / m2 (svetocopy 80 g / m2) Hardness - 150 mH (svetocopy 125mH) and other indicators.

2. In second place is premium grade A paper - Ballet premier distinguished by high degree:

Whiteness 161% CIE Brightness 98% ISO Opacity 93%

3. Third place belongs to paper Ballet Classic , class B, which also has excellent characteristics:

Whiteness 153% CIE Brightness 96% ISO Opacity 92%

4. Paper takes fourth place Ballet universal , C + grade paper:

Whiteness 146% CIE Brightness 95% ISO Opacity 91% Roughness 250 ml / min

5. Paper Svetocopy has almost the same parameters and class C by international classification, moreover, it is ahead of Ballet Universal in terms of the secondary roughness parameter with an indicator of 215 - 250.

Svetocopy Paper White 146% CIE Brightness 95% ISO Opacity 91% Roughness 215 ml / min

Svetocopy office paper specifications:
Indicator name	Svetocopy	Ballet universal	Ballet Classic	Ballet premier	Ballet brilliant
Weight of paper with an area of \u200b\u200b1m2, g	80	80	80	80	82
Thickness, microns	104	104	104	106	113
Hardness MD, mH	125	125	130	135	150
Hardness CD, mH	55	55	55	60	70
Roughness, ml / min	215	250	200	200	160
CIE whiteness%	146	146	153	161	168
ISO D65 / 10% whiteness	105	105	107	110	112
ISO C / 2% whiteness	95	95	96	98	99
Opacity not less than%	91	91	92	93	95
Dennison surface strength, not less	14	14	14	14	16
Surface water absorbency (Cobb g / m2)	25	25	25	25	25
Air permeability ml / min	800	800	800	800	850
Dirt, the number of specks 0.1-0.4 mm2 / m2 no more	10	10	10	10	8
Humidity%	4,6	4,6	4,6	4,6	4,6
Ash content not less than%	18	18	18	18	19
Number of sheets in a bundle	500	500	500	500	500
A4 size mm	210x297	210x297	210x297	210x297	210x297
A3 format size mm	420x297	420x297	420x297	420x297	420x297
Number of packs in a box A4 / A3 pcs	5/5	5/5	5/5	5/5	5/5
Number of boxes in a pallet A4 / A3	48/24	48/24	48/24	48/24	48/24
Pack weight A4 / A3 kg	2,5/5	2,5/5	2,5/5	2,5/5	2,5/5
Carton weight A4 / A3 kg	12/25	12/25	12/25	12/25	12/25
Pallet weight A4 / A3 kg	600/604	600/604	600/604	600/604	600/604
Box volume A4 / A3 m3	0,019/0,033	0,019/0,033	0,019/0,033	0,019/0,033	0,019/0,033
Pallet volume A4 / A3 m3	0,92/0,86	0,92/0,86	0,92/0,86	0,92/0,86	0,92/0,86

Format: A4.
Class: C (C +).
CIE Whiteness: 140-150 +/- 3%.
Density: 72-80 +/- 2-3 g / m2.
Complies with the requirements of GOST R 57641-2017: yes.
Number of sheets in a bundle: 500.
Chlorine Free Bleaching (ECF): Yes.
Aging Resistant: Yes.
Certified according to environmental standards: FSC.
Number of packs on a pallet: 240.

Description

SvetoCopy is the most popular office paper today and is perfect for everyday work. This paper will provide excellent print quality for office documents on all copiers and printers, regardless of their functionality.

SvetoCopy A4 paper is widely used on all types of office equipment due to its characteristics - good smoothness, brightness and roughness, which contributes to the efficiency of office equipment. Sufficient stiffness prevents paper jams, and optimum humidity prevents paper curling. High opacity provides good readability of text on two-sided printing. SvetoCopy of A4 size belongs to the "C" category. Grade "C" paper is the most "basic" option, which is great for everyday use on office equipment. The cost of SvetoCopy packaging, which you can buy in our online store, is relatively low. Competitive prices along with high quality make SvetoCopy available to any consumer. The economy of such paper allows you to copy and print documents in large quantities.

SvetoCopy paper manufacturer is a world leader in its field. SvetoCopy - one of the most common grades on the Russian market - is produced at the Svetogorsk Mill. Here are used modern technologies and the latest equipment for the production, cutting and packaging of paper.