How to determine paper density?

Friends, today we’ll talk about paper density – a parameter that very often determines the properties of a paper product, especially its strength. Density also affects paper transparency

The transparency of paper is determined by passing rays of light through the paper. Transparency is most often considered a disadvantage of paper, as text printed on the other side of the sheet becomes visible. It turns out that thicker paper is less transparent

. толщиномер для бумаги помогает определить ее плотность

Nowadays, there are many types of paper on the market, so it will not be difficult for any person to choose paper that is thicker and not transparent.

This is important not only for printers, but also for artists. When drawing on thick paper, it warps less from water in the paints and absorbs the paints themselves better, creating the effect of deep, rich color.

What is paper weight?

In general, a measure of paper density is the number of grams per square meter of sheet surface – g/sq. m.

This formulation is confusing because it does not mean density, but the ratio of mass to the area of ​​a paper sheet. It turns out that it is more correct to say: surface area of ​​the leaf.

But this name is long and is not popular when describing paper parameters. The second inaccuracy lies in the formulation of density. Often it refers to bulk density, which is measured in grams per cubic meter –  g/cubic. m. офисная бумага снегурочка в упаковке с обозначением плотности бумаги

For example, speaking about paper density Svetocopy or Snow Maiden
A4 format for a laser printer, which is equal to 80 g/sq. m. we are talking about specific gravity, not thickness. Paper thickness is measured in microns or millimeters.

Such confusion in concepts came to us from America, where the weight of 500 sheets is taken as density
paper of a specific format. In Europe and a number of CIS countries, the ISO international classification standard is used.

It turns out that when talking about paper density, we are talking about the weight of a sheet with an area of ​​1 square meter. As a result, the higher the paper density, the thicker the paper sheet.

How to determine paper density by thickness толщиномер для вычисления плотности бумаги

The paper thickness is usually written on the packaging and there is no reason not to trust the manufacturer. True, an error is allowed in the production of paper, but no more than 5 – 10%, which affects the final density of the product.

If you received a sheet of paper without packaging, and you want to find out its density, then you can take calipers

or thickness gauge

(aka micrometer) and measure the thickness of the paper by hand.

Knowing the thickness of standard paper, you can determine its density
. Below are paper weights and thicknesses.

Glossy paper thickness and weight:

  • 90 gr./sq. m. – 0.106 mm
  • 115 g/sq. m. – 0.108 mm
  • 130 gr./sq. m. – 0.109 mm
  • 150 gr./sq. m. – 0.1-0.11 mm
  • 170 gr./sq. m. – 0.12-0.125 mm
  • 200 gr./sq. m. – 0.17 mm
  • 250 gr./sq. m. – 0.18-0.19 mm
  • 300 gr./sq. m. – 0.22 mm

Thickness and density of matte paper:

    • 90 g/sq. m. – 0.106 mm
    • 115 g/sq. m. – 0.109 mm
    • 130 gr./sq. m. – 0.1-0.11 mm
    • 150 g/sq. m.- 0.12-0.13 mm
    • 170 gr./sq. m. – 0.14 mm
    • 200 gr./sq. m. – 0.18-0.19 mm
    • 250 gr./sq. m. – 0.22-0.23 mm
    • 300 gr./sq. m. – 0.31 mm

плотность офсетной бумаги очень высокая, но бумага тонкая

Thickness and density of office paper:

  • 80 g/sq. m.
    – 0.1 mm (104 microns)

It is worth remembering that the density of paper can be different with the same thickness.

Provided the same density, thicker paper will be looser, which can negatively affect when printing on inkjet
printers with water-based inks.

Thin paper will be more compressed. A striking example of such paper is offset paper, on which the ink is not absorbed, but dries quickly on the surface.

Purpose of paper depending on density

Below is a ranking by paper density, which is often used in printing for the manufacture of products for various purposes

  • 40-70 g/sq. m.
    – “newsprint” papers have such a low density. They are used for printing inexpensive forms, extremely cheap handouts, leaflets and newspapers. Often falls under the definition of “ offset
    “. как определить плотность бумаги с помощью штангенциркуля своими руками
  • 80 gr./sq. m.
    – this is the density of classic office document paper. Often this paper is called “80 gram offset paper” or “80 gram offset paper.”
  • 90-115 gr./sq. m.
    – the most popular weight for coated paper. We are used to seeing such paper in the form of advertising flyers for “Sushi Menu at Home” in our hallways and mailboxes.
  • 130 g/sq. m.
    – material for “advanced” leaflets and booklets. Due to the fact that it looks more presentable, it attracts more attention. Also often found in brochure blocks.
  • 150 gr./sq. m.
    – a thick leaflet, flyer or booklet – when the advertisement needs to be placed on the table in a restaurant or bar counter.
  • 170 g/sq. m.
    – such thick paper
    often used for printing wall, desk, and other calendars.
  • 200 g/sq. m.
    – often used for the cover of expensive brochures or books. Also suitable for making quality flyers, booklets and wedding invitations.
  • 250 g/sq. m.
    – often used for printing postcards, mass-produced inexpensive business cards or presentations.
  • 300 g/sq. m.
    – the most popular paper for business cards, because 95% of high-quality business cards are made on this type of paper.

So that you don’t get bored when reading about paper thickness, watch a cute and kind cartoon about the role of a paper airplane
in a person’s life – a cartoon about love with good sound design in the best style of a French animatographer from the Disney company.