JPS63274590A - Relief printing - Google Patents

Abstract

PURPOSE:To enable relief printing even after printing ink is dried by projecting a heat ray on a printed matter to cause printing ink to generate heat and softening relief powder sprayed previously to left it adhere the printing ink. CONSTITUTION:Printed matter 1 is transmitted below a hopper 3 by a conveyor 2, and relief powder 4 is sprayed through tiny holes at the bottom. Later, the printed matter 1 is transported to a heating flash part 6 by a conveyor 5, and a heat ray is projected to the printed matter by a xenon lamp 7. Then the heat ray is absorbed by printing ink, resulting in the softening subsequent temporary sticking of a relief powder particles to each other or to the printing ink. Next, extra relief powder particles 4 are wiped off the printed matter 1, and the printed matter 1 is sent to a heating part 13 by a conveyor 12 to melt the relief powder 4 so that it stands out in relief on the surface of the printing ink. Consequently, the relief powder 4 need not be sprayed before the drying of the printing ink, but relief printing can be performed freely at any time.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to an embossing printing method.

(Prior Art) Embossing and printing, in which a printed part such as a character or a design is formed so as to be raised from the surface of a sheet of paper, are already well known. This is done by sprinkling embossing powder (for example, polyamide dimer acid resin) on the printed area and heating it, so that the embossing powder melts and adheres to the printed area.

By the way, in the past, in this type of printing, after printing with printing ink, embossed powder was sprinkled while the printing ink was not drying, and the embossed powder was temporarily attached using the adhesive force of the printing ink at that time. After setting it aside, the excess embossing powder is brushed off, and then it is heated.

According to this method, the intended embossing printing is possible, but as can be understood from the above explanation, the embossing powder cannot be applied immediately after printing for a short period of time (for example, about 1 hour) before the printing ink dries. This has the disadvantage that it has to be sprayed, and therefore, after the printing ink has dried, it is no longer possible to carry out this type of slag printing.

(Problems to be Solved by the Invention) An object of the present invention is to propose a printing method that enables arbitrary relief printing even after the printing ink has dried.

(Means for Solving the Problems) This invention first sprinkles embossing powder on the surface of a printed matter, and then irradiates the printed matter with heat rays for a short period of time.

The printing ink is heated, and the heat generated softens the previously sprinkled embossing powder, and this softening causes the embossing powder to temporarily adhere to the printing ink. It is characterized in that it is brushed off from the surface of the printed matter, and then the printed matter is heated to an extent that the embossed powder is dissolved in the same manner as in the past.

(Example) An example method of this invention will be explained with reference to the drawings.

1 is a printed matter that has already had the required printing completed on its surface.

This is first sent to the lower part of the hopper 3 by the conveyor 2. The hopper 3 stores an embossing powder 4, and when the hopper 3 is subjected to electromagnetic vibration, for example, the embossing powder 4 is scattered over the entire surface of the printed matter 1 that has been previously sent through a small hole in the lower surface.

The printed product 1 is then conveyed by a conveyor 5 into a heating flash section 6 . The heating flash unit 6 is constituted by, for example, a strobe lamp or a xenon lamp 7 that irradiates heat rays.

The printed matter 1 is then irradiated with the heat rays emitted from this.

When the printing ink on the surface of the printed material absorbs this heat ray, the printing ink generates heat. The heat softens the embossed powder on the surface of the printing ink, causing the embossed powder to temporarily adhere to each other and to the printing ink that is generating heat.

If the printing ink is heated in this manner and the embossed powder is attached, there is no need to spread the embossed powder until the printing ink dries as in the conventional method.

The surface of the printed matter must not change color due to the heating of the printing ink by the heating flash unit 6.

Furthermore, since the embossed powder softens at about 100°C, it is preferable to heat the lamp 7 by emitting light instantaneously.
Here, heating was performed by irradiating with a 700 W xenon lamp 7 for several milliseconds.

Note that the degree of heat absorption differs depending on the type of printing ink or its color, so even if the embossing powder is spread evenly, the amount of embossing powder adhering to the printing ink will vary depending on the printed area. become. Specifically, the amount of adhesion on non-printed areas or light-colored areas is small, and the amount of adhesion is large on dark-colored areas.

After this, excess raised powder is brushed off from the surface of the printed product 1, for example by using a plurality of feed rollers 8 as shown in the figure.
The printed material 1 is transported upward using a transport mechanism 9 consisting of
If you apply 0 and vibrate, excess embossed powder will be easily shaken off. 0 In the figure, 11 is a spring roll for collecting embossed powder.

Thereafter, the printed matter 1 is sent to the heating section 13 by the conveyor 12 in the same manner as before, and heated there to dissolve the embossed powder. The heating section 13 is constituted by, for example, an infrared heater 14, and the embossed powder is melted by the heat generated therefrom. The dissolved embossed powder adheres to the surface of the printing ink in a raised manner as in the conventional method. 15 is a paper tray.

(Effects of the Invention) As detailed above, according to the present invention, there is no need to spray embossing powder until the printing ink dries.
Therefore, it is possible to perform embossing printing on printed matter at any time and at any time.

[Brief explanation of drawings]

The figure is a front view of an apparatus for explaining a method according to an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Printed matter, 4... Embossed powder, 6... Heating flash section, 13... Heating section.

Claims (1)

[Claims] The embossing powder is first sprinkled on the surface of the printed matter, and then the printed matter is irradiated with heat rays for a short time to generate heat in the printing ink, and the heat generated at that time softens the previously sprinkled embossing powder. The embossed powder is temporarily attached to the printing ink by softening, and then the excess embossed powder is brushed off from the surface of the printed matter, and then the embossed powder adhering to the surface of the printed matter is dissolved. An embossment printing method characterized in that the printing ink is heated to a certain degree and adhered to the surface of the printing ink in a raised manner.