How to choose thermal paper

How to make thermal paper

 

Thermosensitive paper is a kind of processing paper; its manufacturing principle is in the quality of the original paper coated with a layer of "thermosensitive coating. Thermosensitive paper coating thermosensitive components are mainly two kinds: one is a colorless dye called leuco dye; The other is the color reagent. This type of thermal paper is also known as a two-component chemical, thermal recording paper.

Thermosensitive paper on the heat of colorless dye and chromogenic agent chemical reaction to produce color, so the use of thermosensitive paper in the fax machine to receive a signal to print or directly with a thermosensitive printer printed, graphic and text is shown. Because the variety that USES colorless dye has a lot of kinds, the handwriting color that shows so has different, have blue, Burgundy, and black to wait. Common lottery tickets use thermal paper.

How to choose thermal paper

 

Thermosensitive printing paper is generally divided into three layers, the bottom layer for the paper base, the second layer for thermosensitive coating, and the third layer for the protective layer, which mainly affects the quality of thermosensitive coating or protective layer.

If uneven thermal paper coating, it will lead to print, in some places darker, some local color shallow, significantly lower print quality; if the thermal coating of the chemical formula is unreasonable, it can cause printing paper to save time becomes very short, good printing paper after printing can save (under the condition of normal temperature and avoid direct sunlight) five years, are now more long-term thermal paper can save ten years, but if the thermal coating formula is not reasonable, maybe only a few months.

Protective coatings are also critical for retention time after printing. The protective layer is above the thermosensitive layer to protect the thermosensitive layer, resist chemical corrosion, prevent label contamination (such as hand sweat, bloodstains on blood bank labels, etc.), and protect the print head. It absorbs some chemical reaction that generates heat-sensitive coating light, slows the deterioration of paper, and the thermal sensor can protect the printer is not damaged, but if the protective coating is not even, not only can it greatly reduce the thermal protection coating, even in the printing process will appear tiny particles protective coating fall off, friction printer thermal element, lead to the damage of print heat-sensitive components.

Quality identification of thermosensitive paper

1. appearance:

If the paper is very white, the protection of the paper coating and thermosensitive coating is not reasonable; added too much phosphor, the better paper should be slightly green. Paper smoothness is not high or looks like uneven paper coating; if the paper looks like reflected light is very strong and added too much phosphor, the quality is not good.

2. fire:

Fire roasting method is also very simple, with a lighter on the back of the paper heating, if the heating, the paper is out of color for brown, thermal sensitive formula is not very reasonable, preservation time may be relatively short if the black part of the paper has a small stripe or color block uneven, uneven coating. After heating, better quality paper due to the black-green (with a little green), and color block uniform, from the center to the surrounding color gradually faded.

3. Comparison and identification of sunlight exposure:

If you rub the printed paper with a highlighter and leave it in the sun (to speed up the reaction of the thermosensitive coating to light), which paper darkens fastest means, it will last less time.