JPH046937Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a heat-sensitive recording paper in which a coloring agent and a coloring agent react with each other upon receiving heat, thereby producing a colored image.

(Prior Art and Problems) Thermosensitive recording paper is used in a wide range of fields as a recording medium for facsimiles, various computers, and the like. However, most conventional thermal recording papers have a basis weight of 150 g/m ² or less with respect to their base paper. The reason for this is that until now there has been little need for more than 150g/ ^m2 , and other reasons include
This is because heat-sensitive recording paper of 150 g/m ² or more has problems in the manufacturing process, particularly in the applicability of coating liquid and curling. Particularly in the case of the latter reason, that is, when applying heat-sensitive paint to the base paper, a bar coater, blade coater, air knife coater, etc. are used as coating equipment, but when the basis weight of the base paper increases, when using a bar coater, When using a blade coater with a bar, there is a problem that the contact profile with the blade is not uniform, making it difficult to obtain a uniform coated surface. Furthermore, when coating a web of paper and applying the coating to the next web, paper splicing is performed in continuous operation. The paper connection on the coating device is usually done by attaching the new paper to be applied next to one of the rotary winding supports of the unreel stand in the coating device (the old web is set on the other support). A roll of paper is set, glue is applied to the starting end of the paper, and it is left on standby. When the application of the old paper is finished, the supporting section is rotated to join the end of the old paper to the new paper, and at the same time, the old paper is cut. It is done by this method.

However, in this paper joining method, when the base paper has a basis weight of, for example, 150 g/m ² or more, it is difficult to join them together even with gluing, and it is also difficult to cut them. For this reason, when coating base paper with a basis weight of 150 g/m ² or more, continuous operation is difficult.

The above problems also apply to air knife coaters.

Furthermore, when the base paper has a basis weight of 150 g/m ² or more, curling tends to occur when the coating liquid is applied and dried, and the curls that occur are difficult to correct.
Therefore, there are problems in that it is difficult to use with printers, faxes, etc., and it also lacks quality suitability for various uses.

However, on the other hand, the field of use for thermal recording paper is gradually expanding, and there is a trend to use thick thermal recording paper with a basis weight of 150 g/m ² or more for tags, tickets, cards, price tags, etc. be. However, in reality, there are problems in the manufacturing process and quality as described above, and the current situation is that full-scale practical use has not been reached.

(Problems to be Solved by the Invention) The object of the invention is to provide a thick thermosensitive recording paper with a basis weight of 150 g/m ² or more and no curling, without the above-mentioned manufacturing problems. .

(Means and effects for solving the problems) The present invention provides a thermosensitive recording paper 3 in which a base paper 1 is provided with a recording layer 2 containing a coloring agent and a coloring agent as main components. This could be achieved by joining the above paper sheets together.

To manufacture thermal recording paper with such a configuration, first, a thermal coating liquid is applied to a base paper with a basis weight of 150 g/m ² or less,
After drying, another base paper will be bonded via an adhesive (including lamination processing and adhesive processing). In this case, since it is possible to bond other base papers via adhesive to form multiple layers as required, products of any basis weight can be manufactured.

Furthermore, if a magnetically processed sheet is bonded to the back surface of the other base paper, it can also be used as magnetic thermal paper. Furthermore, it is also possible to impart a tamper-proofing function by coloring the adhesive.

Note that if the surface of the recording layer is overcoated with a polymeric substance or the like, a thick thermal paper with excellent storage stability can be obtained.

(Effects of the invention) The obtained thermal recording paper does not curl, so it can be used in printers, fax machines, etc. without any problems, and can be used for tags, tickets, etc.
It has the advantage of being suitable for use in fields where thick materials are required, such as carts and price tags.

[Brief explanation of the drawing]

1 and 2 are side sectional views of the thermal recording paper according to the present invention. 1...Base paper, 2...Recording layer, 3...Thermosensitive recording paper, 4...Adhesive layer, 5...Base paper.

Claims (1)

[Scope of utility model registration request] A thermosensitive recording paper 3 in which a base paper 1 is provided with a recording layer 2 containing a coloring agent and a coloring agent as main components, characterized in that the base paper is made up of at least two or more paper sheets joined together. thermal recording paper.