High-gloss thermosensitive paper and a manufacturing process thereof

Abstract

The invention relates to high-gloss thermosensitive paper and a manufacturing process thereof, wherein a base paper layer, a prime coat layer, a thermosensitive chromogenic layer and a top coating protection layer are sequentially arranged from bottom to top. The manufacturing process comprises: (1) selecting a coating substrate; (2) preparing a prime coat later coating liquid; (3) preparing a thermosensitive chromogenic layer coating liquid; (4) preparing a top coating protection layer coating liquid; and (5) respectively beating each coating liquid into the material grooves of a coating machine, sequentially coating a paper base material with a prime coat layer, a thermosensitive chromogenic layer and a top coating protection layer by using a metering rod coating method, discharging outof the machine, carrying out calendering, and sub-cutting to obtain the finished product, wherein the three layers are coated at one time. According to the present invention, the coating surface of the product has significant gloss, the gloss can reach 60-70% according to the different abilities of the calendering equipment during the processing, and after the product is printed, the thermosensitive color developing part is black and has bright light effect so as to achieve the beautiful thermosensitive printing effect.

Description

technical field [0001] The invention relates to the technical field of heat-sensitive paper, in particular to a high-gloss heat-sensitive paper and a manufacturing process thereof. Background technique [0002] Heat-sensitive materials are generally made by coating heat-sensitive functional coatings on the coating substrate. The most common coating substrate used is paper, which is the most versatile, and there are some special applications such as water or humid environments that are not suitable. When paper substrates are used, or the labels of some high-end products, etc., film substrate heat-sensitive materials such as BOPP and PET are usually used. [0003] So far, the heat-sensitive materials on the market are basically matt or semi-matt on the coating surface. The reason is that the end users have no specific requirements for the surface gloss of the product, and the reason is more because of the heat-sensitive material. The particularity of the coating and the low s...

AI Technical Summary

Problems solved by technology

Generally, calcined kaolin is used for the base coat or mixed with hollow balls. Due to the high proportion of calcined kaolin and less adhesive, the primer of the base coat is not fine enough, which is not conducive to the improvement of the final gloss; In addition to organic components such as coloring agent, color developer, sensitizer, etc., a part of light calcium, silica, washed kaolin and other fillers with certain absorption capacity and relatively low wear value are also used. Generally, latex and PVA are used as adhesives. The proportion of the total amount of adhesive is generally not more than 10% of the total dry weight, and the solid content of the general coating is within 30%, so the contribution of the chromogenic layer to the gloss is also limited; the coating of the top coating protective layer The amount generally does not exceed 2g / m 2 , too high will affect the definition of thermal printing, and the thin coating thickness is not conducive to the improvement of gloss; in the process of top coating protective layer coating, because it needs to adapt to the ink absorption and drying in the printing process, a large amount of light calcium is generally used, etc. Inorganic fillers, or adding a certain amount of silica, silica will produce a matting effect, the use of a large amount of fillers makes the proportion of adhesives unable to reach a sufficient amount, and it is difficult to achieve high gloss performance

Based on the above, the unfavorable factors such as low solid content, low coating weight, low adhesive dosage and the use of some matting fillers make it difficult for traditional heat-sensitive coatings to achieve high gloss performance

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