JPH0152413B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a continuous ultraviolet treatment apparatus that continuously irradiates flexible objects such as plastic molded sheets, films, and electric wires with ultraviolet rays.

Conventionally, it has been known to treat various types of plastics with ultraviolet light for the purpose of surface modification, but when this ultraviolet treatment is carried out in the air, oxygen in the air inhibits the crosslinking reaction.
Furthermore, due to energy loss due to air existing between the ultraviolet lamp and the object to be treated, there are disadvantages in that the treatment effect is insufficient and the treatment time becomes longer. Therefore, this ultraviolet treatment is often carried out under a vacuum.For example, when treating soft vinyl chloride resin molded products containing internal additives such as plasticizers, it is necessary to irradiate them with ultraviolet light of 200 nm or less. When cross-linking is created on the surface of a material to prevent leaching of plasticizers, etc., the processing time is shorter when this is performed under vacuum compared to processing under atmospheric pressure.
It is reported that it can be reduced to less than 1/10. However, all of these are batch-type products, and it is said that no method or apparatus has been developed for continuous ultraviolet treatment of continuous products such as sheets, films, and electric wires under vacuum.

Regarding this ultraviolet treatment, there is also a known method in which the air in the treatment chamber is replaced with an inert gas such as nitrogen or argon, and the ultraviolet treatment is performed in this inert gas atmosphere in order to avoid the adverse effects of the air mentioned above. However, since this is also a batch type, productivity is low, and it also has the disadvantage of increasing gas consumption.

The present invention relates to a continuous ultraviolet treatment device that solves such disadvantages, and this ultraviolet treatment device has preliminary chambers before and after the ultraviolet treatment tank, and includes a pair of upper and lower sealing rolls arranged in plurality and a pair of upper and lower sealing rolls. Preliminary chambers each consisting of a housing for storage are placed before and after the ultraviolet treatment tank, and a large number of ultraviolet lamps are arranged in the ultraviolet treatment tank to irradiate the plastic film that is guided by guide rollers and travels around the tank. , relates to a continuous ultraviolet treatment device characterized in that the plastic film is introduced from the atmosphere through a front preliminary chamber into an ultraviolet treatment tank, and after ultraviolet treatment is continuously sent out into the atmosphere through a rear preliminary chamber. It is something.

Next, one embodiment of the present invention will be described based on the drawings. Fig. 1 shows a continuous ultraviolet treatment apparatus of the present invention, and the ultraviolet treatment tank 1 in the figure has a plurality of ultraviolet treatment tanks in it. Ultraviolet lamps are arranged in parallel, and in order to maintain the inside of the lamp in a desired atmosphere, such as a vacuum or an inert gas atmosphere, there is a front preliminary chamber 2 equipped with a sealing mechanism to isolate it from the outside air. The rear spare room 3 is joined. These two preliminary chambers are formed by a pair of upper and lower seal rolls, a housing, and a sealing mechanism arranged in plural numbers in the conveying direction of the object to be treated, and the ultraviolet treatment device 1 and the two preliminary chambers 2, 3 is kept in a vacuum or any inert atmosphere by exhausting or injecting air from pipes 5 and 7 installed therein, and Item F is this front spare room 2
The object F to be treated is introduced into the ultraviolet treatment tank 1 through the ultraviolet rays treatment tank 1, and the object F treated with ultraviolet rays is wound up into the winding device 23 through the rear preliminary chamber 3.

FIG. 2 is a top view showing the pump and piping for adjusting the atmosphere of the ultraviolet treatment apparatus in FIG. Two spare rooms 2,
A vacuum pump 6 and its exhaust pipe 7 for evacuating the space 3 are shown.

3 and 4 show examples of the arrangement of ultraviolet lamps in the ultraviolet treatment tank 1 of the ultraviolet treatment apparatus of the present invention, and the ultraviolet treatment tank 101 in FIG. 3 has a built-in rotating drum 102. and
Ultraviolet lamps 104 for irradiating ultraviolet rays onto the workpiece guided onto the rotating drum by guide rolls 103 are arranged in parallel at positions surrounding the drum. FIG. 4 shows another arrangement of ultraviolet lamps, in which an ultraviolet lamp 104 for irradiating ultraviolet rays onto an object is guided by a guide roller 103 and the object to be treated is guided by a guide roller 103 and travels around the tank. They are arranged in multiple columns to illuminate both sides of the screen. Each of these ultraviolet lamps 104 is cooled by a cooling jacket (not shown), which stabilizes the processing effect and prevents thermal deterioration of the object to be processed. .

5 and 6 are enlarged views of essential parts for explaining the sealing mechanism for constructing the preliminary chambers 2 and 3, FIG. 5 is a side sectional view thereof, and FIG. 6 is a side sectional view thereof.
This figure shows an upper roll 13 whose both end surfaces are rotatably supported by a side piece 11 and whose surface is integrally coated with an elastic body 12 such as rubber; Similarly, a lower roll 14 whose both ends are rotatably supported by a side piece 11, a chrome nickel layer is applied to the surface, and which is disposed opposite to an upper roll 13, and an upper case 1 that covers these.
5. It is composed of a lower case 16, which is also made of an elastic material such as urethane rubber, which is in continuous contact with the upper case 15 and a part of the outer periphery of the lower case 16 along the axial direction. A manufactured ripple member 17 or 18 is attached, which allows the workpiece to be transported forward while maintaining the atmosphere within the system.

The ultraviolet treatment device according to the present invention consists of an ultraviolet treatment tank and two preliminary chambers equipped with the above-mentioned sealing mechanism. According to this, the ultraviolet treatment device can continuously perform ultraviolet treatment without exposing the object to the atmosphere. It gives you the advantage of being able to. Then, this ultraviolet treatment tank can be evacuated as necessary, or after being evacuated, an inert gas can be introduced into it to replace the inside of the system with the inert gas. Since the treatment atmosphere can be arbitrarily selected depending on the type of object to be treated and the purpose of the treatment, effective ultraviolet treatment can be applied to a wide range of objects. In addition, the device of the present invention is provided with a preliminary chamber with a sealing mechanism before and after the ultraviolet treatment tank, and the atmosphere of this preliminary chamber can be arbitrarily selected in the same manner as the ultraviolet treatment bath, which is also necessary. Depending on the situation, this can be used as an atmosphere adjustment chamber for the ultraviolet treatment tank with a slightly different atmosphere from that of the ultraviolet treatment tank, so that it is possible to perform continuous treatment in which various treatments are changed in stages. Moreover, since the sealing mechanism in this pre-chamber includes a sealing roll that transports the workpiece forward, it is especially possible to ensure that long continuous objects such as sheets, films, and electric wires are continuously and reliably processed. It can be processed efficiently.

[Brief explanation of drawings]

FIG. 1 is a front view showing an example of the ultraviolet treatment device of the present invention, FIG. 2 is a top view thereof, and FIGS. 3 and 4 are front views showing examples of arrangement of ultraviolet lamps in the ultraviolet treatment tank. Figures 5 and 6 are partially enlarged views for explaining the sealing mechanism between the roll and case of the preliminary chamber and the rolls, Figure 5 is a side sectional view thereof, and Figure 6 is a line taken along the - line in Figure 5. It is an arrow view. DESCRIPTION OF SYMBOLS 1,101... Ultraviolet treatment tank, 102... Rotating drum, 103... Guide roll, 104... Ultraviolet lamp, 2, 3... Preliminary chamber, 11... Side piece, 13
... Upper roll, 14... Lower roll, 17, 18... Ripple member, 22... Unwinding device, 23... Winding device, F
...Object to be processed.

Claims (1)

[Scope of Claims] 1. In an ultraviolet treatment device having preparatory chambers before and after an ultraviolet treatment tank, a preparatory chamber consisting of a plurality of pairs of upper and lower seal rolls and a housing for storing the rolls is provided before and after the ultraviolet treatment tank. Inside the ultraviolet treatment tank, a large number of ultraviolet lamps are arranged to irradiate the plastic film that is guided by guide rollers and travels around the tank. 1. A continuous ultraviolet treatment device, characterized in that it is configured such that the ultraviolet rays are introduced into the room and are continuously sent out into the atmosphere through a rear preliminary chamber after ultraviolet treatment. 2. The continuous ultraviolet treatment apparatus according to claim 1, wherein the ultraviolet lamp is of a structure that is cooled by a cooling jacket.