JP4537513B2 - Ultraviolet irradiation surface processing equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an ultraviolet irradiation surface processing apparatus used for surface processing such as gloss processing on a workpiece such as base paper, processed paper, printing paper, and plastic sheet coated with an ultraviolet curable resin.
[0002]
[Prior art]
Conventionally, various surface processing techniques for improving the gloss of the surface have been known. For example, a press machine is used to apply gloss processing by pressing a resin coated on the surface while heating, or a pair of opposed processing. An apparatus for transferring a mirror surface to the surface of a workpiece using one of the pressure rollers as a mirror roller is known.
Further, in recent years, in order to improve the glossiness of the surface of the workpiece, there is an apparatus for coating the surface of the workpiece with an ultraviolet curable resin and glossing the surface of the workpiece. This device has a structure in which a pair of roller devices arranged opposite to each other is formed of a member having a good ultraviolet transmission property on the outer periphery, and has an ultraviolet irradiation device inside thereof, and an ultraviolet curable resin is applied to the surface. When the work piece is inserted between the rollers and passed therethrough, surface treatment can be performed by irradiating ultraviolet rays while pressing. However, this apparatus has the disadvantages that the stability during machining and the machining speed are delayed, and further, the irradiation position becomes one point, and the machining speed cannot be increased. Further, there is a problem that the amount of oxygen inhibits the curing of the ultraviolet curable resin. Accordingly, the present inventors have improved the efficiency of the machining process by arranging two feeding pressure rolls for one ultraviolet irradiation roll in the prior application (Japanese Patent Laid-Open No. 8-131927) as an improvement. A device for stable processing was also proposed.
[0003]
[Problems to be solved by the invention]
However, although the two pairs can stabilize the operation rather than the pair of roller systems, the surface quality and speedup are still insufficient.
[0004]
[Means for Solving the Problems]
The present invention has been found after intensive studies in view of the above, and is installed in parallel with an ultraviolet irradiation roll for installing an ultraviolet irradiation apparatus installed on an endless belt mechanism, and below the ultraviolet irradiation roll. A first feeding roll and a second feeding roll, the first feeding roll and the second feeding roll have a smaller diameter than the ultraviolet irradiation roll, and the diameter of the second feeding roll is 1 to 5 with respect to the first feeding roll. The surface treatment apparatus for ultraviolet irradiation is characterized in that the rotation speed of the second feed roll is increased by 1 to 10% relative to the first feed roll, or both are used in combination. .
[0005]
DETAILED DESCRIPTION OF THE INVENTION
The ultraviolet irradiation surface processing apparatus of the present invention includes an ultraviolet irradiation roll having an outer periphery formed of an ultraviolet transmissive material and a suppression mechanism in the vicinity, and an ultraviolet irradiation apparatus (ultraviolet irradiation lamp) provided therein, and a diameter smaller than that of the ultraviolet irradiation roll Using the first feed roll and the second feed roll, the UV irradiation roll is installed on the endless belt mechanism, and the first feed roll and the second feed roll are opposed to the UV irradiation roll under the endless belt. It is the structure arranged in parallel. The configuration up to here is the same as that of the prior application (Japanese Patent Laid-Open No. 8-131927).
[0006]
In the present invention, the diameter of the second feed roll is increased by 1 to 5% with respect to the first feed roll, or the rotation speed of the second feed roll is increased by 1 to 10% with respect to the first feed roll, Or it is different from the previous application in that both are used together. In addition, at least the outer periphery of the first feed roll is formed of a material having a lower hardness than the ultraviolet irradiation roll (glass), such as semi-hard urethane, silicone rubber, fluorine rubber, and the like, and a mirror surface formed on the surface of the ultraviolet irradiation roll It is desirable that the pattern or the like is strongly reproduced (followed) by the ultraviolet curable resin on the surface of the workpiece.
[0007]
That is, by increasing the diameter of the second feed roll relative to the first feed roll or by increasing the rotation speed of the second feed roll relative to the first feed roll, The peripheral speed increases. Therefore, it is possible to give an appropriate tension when the work piece coated with the ultraviolet curable resin on the surface is inserted between the ultraviolet irradiation roll and the first feed roll, and to reduce the oxygen amount on the spot. it can. Here, since oxygen serves to lower the reaction rate in curing the ultraviolet curable resin, a method of preventing the reaction rate from lowering by forcibly reducing the oxygen concentration with nitrogen or the like is also known. In the present invention, since the amount of oxygen can be reduced by increasing the peripheral speed of the second feed roll, the reaction rate of the ultraviolet curable resin can be increased and the surface quality can be stabilized. As shown in FIG. 1, the oxygen amount and the curing rate of the ultraviolet curable resin have a relationship that the curing rate is slower as the oxygen amount is larger, and the curing rate is faster as the oxygen amount is smaller.
[0008]
Moreover, although the diameter of the 2nd feed roll with respect to a 1st feed roll is 1 to 5% larger, if it is smaller than this, sufficient effect will not be acquired, but if it is larger than this, stable running cannot be obtained. Similarly, the rotational speed of the second feed roll relative to the first feed roll is 1 to 10% larger, but if it is smaller than this, a sufficient effect cannot be obtained, and if it is larger than this, stable running cannot be obtained.
[0009]
Furthermore, it is desirable that the endless belt is bridged between the first feed roll and the second feed roll because speed can be increased. In other words, a normal endless belt is bridged so as to be supported by a large number of feed rolls along the flow direction, but the first feed roll and the second feed roll are only supported in the middle to increase the speed. In order to achieve this, troublesome adjustment is required due to the presence of these many feed rolls. Therefore, when the endless belt is bridged between the first feed roll and the second feed roll, the work piece is brought in on the first feed roll and the work piece is taken out from the second feed roll. Therefore, although it is necessary to provide an endless belt mechanism separately, it is possible to speed up the surface processing without requiring troublesome adjustment. In this way, the endless belt can be bridged between the first feed roll and the second feed roll, in other words, the endless belt mechanism can be divided to increase the speed.
[0010]
Moreover, it is desirable to make the pressing pressure of the second feed roll about 10%, 5-15% smaller than the first feed roll. This is because the effect of increasing the peripheral speed of the second feed roll described above effectively acts between the first feed roll and the ultraviolet irradiation roll. When applied to gloss (mirror surface) processing, the pressing pressure and the gloss level have the relationship shown in FIG.
[0011]
【Example】
Next, the ultraviolet irradiation surface processing apparatus of this invention is demonstrated in detail based on the Example of drawing.
FIG. 3 is a schematic explanatory view of the ultraviolet irradiation surface processing apparatus of the first embodiment of the present invention.
The present invention is an apparatus for applying surface processing to workpieces such as base paper, processed paper, and printing paper coated with UV curable resin on the surface. Specifically, surface quality is stabilized and speeded up. A surface processing apparatus 1 for processing a surface of a workpiece A transferred by an endless belt mechanism B, which is formed from an ultraviolet light transmissive material and suppressed. An ultraviolet irradiation roll 2 provided with an ultraviolet irradiation lamp 4 in close proximity to the mechanism 3, a first feed roll 5 having a diameter smaller than that of the ultraviolet irradiation roll 2, and a first feed roll 5 having a diameter 5% larger than the first feed roll 5. Using the second feed roll 6 whose rotational speed is 10% larger than that of the roll 5, the ultraviolet irradiation roll 2 is installed on the endless belt mechanism B, and the first feed is placed below the ultraviolet irradiation roll 2 with the endless belt interposed therebetween. It was juxtaposed with Lumpur 5 and a second feed roll 6 in the opposite manner.
[0012]
That is, surface processing is performed by an endless belt mechanism B that continuously drives a workpiece A made of a sheet of base paper, processed paper, printing paper or the like coated with UV curable resin on the surface by various coater devices. The workpiece A conveyed sequentially by the endless belt mechanism B is subjected to surface modification such as gloss (mirror surface) processing by the surface processing apparatus 1 of the present invention, and again. By the endless belt mechanism B, it is sequentially conveyed to a stacker device (not shown) or the like.
[0013]
First, the surface processing apparatus 1 using the ultraviolet irradiation roll of the present invention is such that the outer periphery of the ultraviolet irradiation roll 2 is formed of an ultraviolet transmitting material as shown in FIG. Is optional depending on the purpose of processing, and it is also possible to form a mirror surface or a pattern.
[0014]
The ultraviolet irradiation roll 2 is not fixedly installed on the endless belt mechanism B, but is arranged so that a basket is also placed on the first feed roll and the second feed roll 6 arranged in parallel downward via the endless belt. Is done. And this ultraviolet irradiation roll 2 can be set as the surface processing apparatus 1 which can respond | correspond to the thickness of the to-be-processed workpiece A by installing so that it can raise / lower to some extent by the raising / lowering mechanism which is not shown in figure. Further, a suppression mechanism 3 provided with a small-diameter roll member and a braking means as a mechanism for assisting this is provided close to the upper part of the ultraviolet irradiation roll 2.
[0015]
Next, an ultraviolet irradiation lamp 4 is provided inside the ultraviolet irradiation roll 2, and the ultraviolet irradiation lamp 4 is used for curing the ultraviolet irradiation resin or the like applied to the surface of the workpiece A. A conventional ultraviolet lamp is provided, which cures an ultraviolet curable resin or the like by irradiating ultraviolet rays, and when the workpiece A passes under the ultraviolet irradiation roll 2 In this case, a curing process is performed simultaneously with the surface processing.
[0016]
Subsequently, a first feed roll 5 having a smaller diameter than the ultraviolet irradiation roll 2 and appropriately rotated by a drive source, and a diameter 5% larger than the first feed roll 5 and a rotational speed 10% larger than the first feed roll 5. A state in which the two feed rolls 6 are used to oppose each other below the ultraviolet irradiation roll 2, and the first feed roll 5 and the second feed roll 6 are arranged in parallel with a predetermined interval. It is fixed and installed. The first feed roll 5 and the second feed roll 6 are made of semi-rigid urethane having a lower hardness than the ultraviolet irradiation roll 2 (glass), and damage the surface of the ultraviolet irradiation roll 2 even if the workpiece is pressed. The shape such as a mirror surface or a pattern formed on the surface of the ultraviolet irradiation roll 2 can be reproduced (followed) on the ultraviolet curable resin on the surface of the workpiece A.
[0017]
The surface processing apparatus 1 configured as described above causes the leading end of the workpiece A, which is sequentially conveyed by the endless belt mechanism B, to be clamped and fed by the first feeding roll 5 and the ultraviolet irradiation roll 2, and then the workpiece. When A is present in the space with the first feed roll 5 and the second feed roll 6, an oxygen-blocked state is formed by this space, and coating is performed by the ultraviolet irradiation lamp 4 provided in the ultraviolet irradiation roll 2. Irradiate the work surface with ultraviolet rays. At that time, as described above, the diameter of the second feed roll 6 is increased by 5% with respect to the first feed roll 5, and the rotational speed 6 of the second feed roll 6 is increased by 10% with respect to the first feed roll 5. Therefore, the peripheral speed of the second feed roll 6 is larger than that of the first feed roll 5, and an appropriate tension is applied when the workpiece A is inserted between the ultraviolet irradiation roll 2 and the first feed roll 5. Therefore, the amount of oxygen on the spot can be reduced, the reaction rate of the ultraviolet curable resin can be increased, and the surface quality can be stabilized. The workpiece A that has been subjected to surface processing and curing treatment is fed and unloaded by the second feed roll 6 at its tip.
[0018]
Thereby, in the surface processing apparatus 1 of this invention, the to-be-processed object A is surface-processed and hardened | cured in the state supported stably between the 1st feed roll 5, the 2nd feed roll 6, and the ultraviolet irradiation roll 2. As a result, the speed can be increased and the surface quality can be stabilized. Specifically, the speed-up means may be configured as in the second embodiment of FIG.
[0019]
FIG. 4 is a schematic explanatory view of the ultraviolet irradiation surface processing apparatus according to the second embodiment of the present invention. Except for the configuration described below, the apparatus is completely the same as the first embodiment. Is omitted.
In the second embodiment, the endless belt mechanism B ′ is not long but has a short configuration spanned between the first feed roll 5 and the second feed roll 6. That is, the long endless belt mechanism B in the first embodiment is divided into short endless belt mechanisms B ′, C, and D in the second embodiment. In this manner, the endless belt mechanism B ′ is bridged between the first feed roll 5 and the second feed roll 6 so that the speed can be increased without requiring troublesome adjustment.
[0020]
The present invention has been described based on the embodiments. However, the present invention is not limited to the above-described embodiments, and can be implemented in any way as long as the configuration described in the claims is not changed. For example, in the embodiment of the present invention, the workpiece A is a single-wafer sheet, but the present invention can also be implemented in the case of, for example, a web-like long object.
[0021]
【The invention's effect】
As described above, the ultraviolet irradiation surface processing apparatus according to the present invention controls the circumference of the second feed roll relative to the first feed roll by controlling the diameter, rotation speed, and the like of the first feed roll and the second feed roll within a certain range. Since the speed is increased, the amount of oxygen can be reduced, the reaction rate of the ultraviolet curable resin on the surface of the workpiece can be increased, and the surface quality can be stabilized. Further, by dividing the endless belt mechanism, higher speed can be achieved.
[Brief description of the drawings]
FIG. 1 is a graph showing the relationship between the amount of oxygen and the curing rate of an ultraviolet curable resin.
FIG. 2 is a graph showing the relationship between the pressing pressure and the surface glossiness of the workpiece.
FIG. 3 is a schematic explanatory diagram of an ultraviolet irradiation surface processing apparatus according to a first embodiment of the present invention.
FIG. 4 is a schematic explanatory diagram of an ultraviolet irradiation surface processing apparatus according to a second embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Surface processing apparatus 2 Ultraviolet irradiation roll 3 Suppression mechanism 4 Ultraviolet irradiation lamp 5 1st feed roll 6 2nd feed roll A Workpiece B, B 'Endless mechanism

Claims (3)

An ultraviolet irradiation roll for installing an ultraviolet irradiation device installed on the endless belt mechanism, a first feeding roll and a second feeding roll installed in parallel below the ultraviolet irradiation roll, and a first feeding roll; The second feed roll has a smaller diameter than the ultraviolet irradiation roll, and the diameter of the second feed roll is increased by 1 to 5% with respect to the first feed roll, or the rotation speed of the second feed roll with respect to the first feed roll Is increased by 1 to 10%, or both are used in combination. The ultraviolet irradiation surface processing apparatus according to claim 1, wherein the endless belt is stretched between the first feed roll and the second feed roll. The ultraviolet irradiation surface according to claim 1 or 2, wherein at least the first feed roll uses a material having a hardness lower than that of the ultraviolet irradiation roll, presses the work piece according to form followability, and irradiates the ultraviolet ray. Processing equipment.

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