JPS595119B2 - Foam molding method for foam printing panels - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for foaming foamed ink printed on the surface of a panel made of synthetic resin, for example, and the gist thereof is a panel 2 on which unfoamed foamed ink 1 is printed on both sides of the panel. The hot air generators 3 arranged on both sides of the panel 2 blow hot air onto the surface of the panel 2 to foam the foamed ink 1, and the hot air suction unit 4 immediately sucks the hot air on the surface of the panel. The present invention relates to a method of foam molding a characteristic foam printing panel.

Conventionally, unfoamed foamed ink is printed on the surface of a material such as iron or paper whose softening temperature or ignition temperature is higher than the foaming temperature of the foamed ink, and then this is passed through a heat drying oven. It was heated and foamed.

However, when a material such as a synthetic resin has a softening temperature lower than the foaming temperature 5 of the foamed ink and is passed through a heat drying oven, the material deforms before the foamed ink foams.
Also, the heat drying oven required a lot of energy to raise its temperature. The present invention has been made in view of the above points, and its purpose is to foam ink printed on a material such as a synthetic resin whose softening temperature is lower than the foaming temperature of the foamed ink. Another object of the present invention is to provide a foam molding method for a foam printing panel in which there is no fear that the material will be deformed due to heat.

The present invention will be described in detail below with reference to the accompanying drawings.

What is shown in FIG. 1 is the entire foaming device for foaming ink, which is roughly divided into a hot air generator A, a panel traveling device B, and a cooling device C. As shown in FIG. 3, the panel traveling device B consists of a vertical rotation roller 5 and a pair of horizontal rotation rollers 6, and the vertical rotation roller 5 is rotatably supported.
One or both of the pair of horizontal rotating rollers 6 are driven to rotate. As shown in FIG. 3, the lower surface of the panel 2 is placed on the vertically rotating rollers 5, and both sides of the panel 2 are sandwiched between the horizontally rotating rollers 5 and 6 to move the panel 2 in the feeding direction. It is meant to be transported. Here, the interval between the horizontal rotation rollers 6 can be adjusted according to the thickness of the panel 2. 2
is a panel made of a synthetic resin extrusion molded product, and 30 decorative patterns are printed on both surfaces of the panel 2 using unfoamed foam ink 1.

As shown in FIG. 1, the panel 2 is transported in an upright position by the panel transport device B. The hot air generator A is a device for carrying out the method of the present invention, and has a configuration 35 as shown in FIG.

In other words, the hot air generator A is a device in which a central hot air generating section 3 and hot air suction sections 4 provided adjacent to both sides of the hot air generating section 3 are integrally formed. The vertically elongated openings 3a and 4a at the tips are aligned flush. Compressed air is sent into the hot air generating section 3 from the air supply port 7 at the rear, and this compressed air is heated to a temperature higher than the foaming temperature of the foaming ink 1 by an electric heater (not shown) in the hot air generating section 3, and is heated to the opening. Hot air is blown out from 3a. The hot air suction unit 4 is connected via a suction duct 8 to a suction device (not shown) using a fan, a pump, etc., and the hot air generation unit 3
The hot air blown out from the opening 4a is sucked into the hot air suction section 4, so that the compressed air or hot air flows through the path shown by the arrow in FIG. Reference numeral 9 denotes an air volume adjustment valve provided within the suction duct 8.

While the panel 2 is being re-fed by the panel traveling device B, the panel 2 is moved by the hot air generator A as shown in FIG.
Hot air is blown onto both sides of the panel, the foamed ink 1 is foamed, and a bulging decorative pattern is formed on the surface of the panel 2. The hot air blown out from the hot air generating section 3 is immediately sucked by the hot air suction section 4, so the hot air does not spread and the area in which the hot air hits the panel 2 is very narrow.
Even when the surface of the panel 2 is heated, the temperature inside the panel 2 does not rise, and the pressure on the surface of the pulse 2 does not rise much even when hot air is blown onto it. As a result, even if the foaming ink 1 has a foaming temperature higher than the softening temperature of the panel 2, it can be foamed without deforming the panel 2. In this hot air generator A, the range in which the temperature of the panel 2 is increased is approximately only about the width of the hot air generator 3. In other words, what is shown in Figure 5 is an actual heat distribution graph, and the horizontal axis is panel 2.
Distance along X(n]n), vertical axis is hot air temperature T(°C)
Therefore, the temperature is almost only within the width a of the hot air generating portion 3. This experiment was conducted under the following conditions. V-J! 1-JVI
Width a of the opening 3a of the hot air generating section 3 - 20mrn Width b of the opening 4a of the hot air suction section 4 = 10? 0.5 to 1.0 kg of compressed air supplied to the hot air generating section 3 Power consumption of the electric heater in the hot air generating section 3 24 KW (AClOOV) Suction device Maximum air volume 5.3 m3/Min Maximum static pressure 8611101Ag Cooling device C is A mist is generated and the mist is sprayed onto the surface of the panel to cool the panel 2. As the mist, low-temperature water vapor generated by an ultrasonic humidifier or the like is preferable to something like steam.

This cooling device C is placed immediately after the hot air generator A, and immediately cools the panel 2 heated by the hot air generator A to prevent further deformation of the panel 2. In addition, when foaming the foaming ink 1 printed on both sides of the hollow panel 2, which is a molded product, as shown in FIGS. Cooling air 12 is blown into the hollow interior 11 of the panel 2 up to the front end opening 10b to cool the panel 2 from the hollow interior 11 of the panel 2 to prevent its deformation and to reduce the pressure on the surface of the panel 2. hollow interior 11
This prevents the pressure from becoming low.

As described above, the present invention uses a hot air generating section to blow hot air onto the surface of a molded product such as a panel on which unfoamed foamed ink is printed, thereby foaming the foamed ink. Because hot air is sucked in immediately,
The hot air does not spread, the area where the hot air hits the panel is very small, the surface of the panel is heated, but the temperature inside the panel does not rise, and even when hot air is blown, the pressure on the panel surface does not increase much. As a result, there is an advantage that even foamed ink whose foaming temperature is higher than the softening temperature of the panel can be foamed without deforming the panel.

In addition, a panel with unfoamed foamed ink printed on both sides is stood up, and the foamed ink is foamed by hot air generators placed on both sides of the panel, so it is similar to when the foamed ink on both sides is foamed with the panel horizontal. There is no heat build-up on the bottom surface of the panel, and there is no heat imbalance between the two sides of the panel due to heat build-up, making it easy to balance the heat between the left and right sides of the panel, making it difficult to deform, and the panel has a beautiful finish. There are advantages.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing a foaming device for foaming ink used in carrying out the present invention, Fig. 2 is a perspective view showing a hot air generator, Fig. 3 is a perspective view showing a panel traveling device, and Fig. 4 is a perspective view showing a foaming device for foaming ink used in carrying out the present invention. FIG. 5, a horizontal cross-sectional view for explaining the operation of the device, is a heat distribution graph of hot air.

Claims (1)

[Claims] 1. A panel with unfoamed foamed ink printed on both sides is stood up, and hot air is blown onto the surface of the panel by hot air generators placed on both sides of the panel to foam the foamed ink.
A foam molding method for a foam printing panel, characterized in that hot air on the surface of the panel is immediately sucked by a hot air suction section.