JP2014008446A - Ultraviolet irradiation apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ultraviolet irradiation apparatus in which a bag can be held in a satisfactorily and stably opened state, ultraviolet light can be emitted toward the inside of the held bag so that a high activation rate of an oxygen absorption layer of the bag can stably be obtained.SOLUTION: The ultraviolet irradiation apparatus 1 includes: a holding unit 10 for holding the bag A in such a state that an opening A1 and the inside A2 thereof are opened; and an ultraviolet lamp 11 which can be inserted in the inside A2 through the opening A1 of the bag A held by the holding unit 10 and emits ultraviolet light toward the inside of the bag A. It is preferable that the ultraviolet irradiation apparatus 1 further includes a rotary drive unit 12 for relatively rotating the bag A held by the holding unit 10 and the ultraviolet lamp 11 inserted in the inside A2 of the bag A around the insertion axis of the ultraviolet lamp 11. It is also preferable that from the ultraviolet lamp 11 ultraviolet light is emitted toward a long zone in the rotation axis direction X and a partial zone in the vicinity of the rotation axis on the inside surface of the bag A.

Description

  The present invention relates to an ultraviolet irradiation device for activating an oxygen absorbing function of an oxygen absorbing layer by irradiating ultraviolet rays inside a bag having an oxygen absorbing layer.

  For example, as a bag that can be stored for a long period of time by suppressing the occurrence of oxygen oxidation, mold and decay of various items that are easily affected or deteriorated by the influence of oxygen, such as food, pharmaceuticals, medical products, cosmetics, metal products, electronic products, and textile products A bag made of a deoxidized multilayer body having an oxygen absorbing layer is known. This type of oxygen-depleting multilayer bag has an oxygen absorbing function (deoxygenating function) activated by irradiating ultraviolet rays from the inside of the bag, and then sealing the bag opening. By reducing the oxygen concentration in the bag, oxygen oxidation, mold and decay of various articles as contents (packaged bodies) are suppressed.

  As a method of irradiating the above-mentioned oxygen absorption layer with ultraviolet rays, Patent Documents 1 and 2 describe that the ultraviolet irradiation part is moved up and down to irradiate the inner surface of the bag with ultraviolet rays.

JP 2006-291087 A JP 2006-056530 A

  However, when the inner surface of the bag is irradiated with ultraviolet rays by the above-described method, the amount of irradiation in the inner surface of the bag depends on the degree of bag opening and bending due to its own weight, so that the oxygen absorbing function of the oxygen absorbing layer is sufficient and It may not be stably activated, and a desired activation rate (the ratio of the area of the activated portion of the total area of the inner surface of the bag) may not be obtained. Especially when irradiating ultraviolet rays to a relatively large and deep bottom bag that contains industrial chemicals, grains, fertilizers, and other powders and granules, the bag is always stable from the bag opening to the inside. Since it is difficult to open, it tends to be more difficult to stably obtain a desired activation rate. On the other hand, if it takes time to open the bag in order to stably obtain a high activation rate, the productivity is significantly reduced.

  The present invention has been made in view of such points, and the bag can be held in a sufficiently and stably opened state, and the inside of the bag can be irradiated with ultraviolet rays in that state, and the oxygen absorption layer of the bag can be highly activated. An object of the present invention is to provide an ultraviolet irradiation device capable of stably obtaining the rate.

  In order to achieve the above object, the present invention provides an ultraviolet irradiation apparatus for activating an oxygen absorbing function of the oxygen absorbing layer by irradiating the inside of the bag having an oxygen absorbing layer with ultraviolet rays, A holding device that holds the opening and the inside thereof in an open state, and an ultraviolet lamp that can be inserted into the inside through the opening of the bag held by the holding device and emits ultraviolet light inside the bag. And an ultraviolet irradiation device.

  According to the above configuration, the bag can be opened sufficiently and stably by the holding device, and since the bag is held in that state, the irradiation amount in the inner surface of the bag is stabilized, and the oxygen absorbing layer has a high activity. The conversion rate can be obtained stably.

  The ultraviolet irradiation device further includes a rotation driving device that relatively rotates the bag held by the holding device and the ultraviolet lamp inserted into the bag around an insertion axis of the ultraviolet lamp. It may be. In such a case, since the ultraviolet lamp and the bag are relatively rotated, it is possible to irradiate ultraviolet rays stably and without unevenness within the inner surface of the bag.

  In the ultraviolet irradiation device having the rotation driving device, the ultraviolet lamp may irradiate ultraviolet rays to a partial region around the rotation axis that is long in the rotation axis direction on the inner surface of the bag. In such a case, since the same part of the inner surface of the bag is not continuously irradiated by irradiating ultraviolet rays while rotating the ultraviolet lamp and the bag relatively, the temperature of the bag due to absorption of ultraviolet rays or emission of the ultraviolet lamps An excessive increase in (surface temperature of the inner surface of the bag) is suppressed. Thereby, even if it is a bag of a material weak to a heat | fever, ultraviolet irradiation can fully be performed. Further, since the temperature does not rise, the output of the ultraviolet lamp can be increased, thereby shortening the ultraviolet irradiation time.

  The rotary drive device may include a rotary drum that surrounds the ultraviolet lamp around a rotation axis and can fix the holding device inside, and a drive unit that rotationally drives the rotary drum. In such a case, the bag can be appropriately rotated with a simple configuration. Moreover, since the ultraviolet rays irradiated from the ultraviolet lamp are blocked by the rotating drum, it is possible to suppress the leakage of the ultraviolet rays to the outside.

  The rotation driving device may further include a rotating body that contacts an outer surface of the rotating drum, and the driving unit may rotate the rotating body to rotationally drive the rotating drum. In such a case, since the rotation driving device can be provided outside the rotating drum, the configuration inside the rotating drum is simplified, and irradiation of the bag from the ultraviolet lamp in the rotating drum can be performed more easily and appropriately.

  The ultraviolet irradiation device includes a locked portion provided on an inner surface of the rotating drum, and a locking portion provided on the holding device and locked to the locked portion. You may make it fix the said holding | maintenance apparatus to the said rotating drum by latching the said latching | locking part to a stop part. In such a case, the holding device can be appropriately fixed to the rotating drum with a simple configuration, and the holding device and the ultraviolet lamp are regulated in a predetermined positional relationship, so that the contact between the ultraviolet lamp and the rotating drum can be reduced. The contact between the ultraviolet lamp and the bag can be reliably suppressed.

  The locked portion extends along the axial direction of the inner surface of the rotating drum, and the locked portion is detachable with respect to the locked portion and is locked to the locked portion. And may be slidable along the locked portion. In such a case, the holding device can be suitably put in and out of the rotating drum, and the bag can be exchanged easily.

  The ultraviolet lamp may be inserted from one opening of the rotating drum, and the holding device may be inserted into and removed from the rotating drum from the other opening of the rotating drum. In such a case, the holding device can be easily put in and out of the rotating drum.

  The ultraviolet irradiation device further includes a carriage for placing and moving the holding device, and the carriage has a slide mechanism for sliding the holding device back and forth, and the holding mechanism is moved forward and backward by the slide mechanism. The holding device may be able to be taken in and out of the rotating drum by sliding it. In such a case, it is easy to move the holding device to which the bag is attached, or to take the holding device into and out of the rotating drum, and the bag can be easily replaced.

  The holding device is arranged along the axial direction on the inner side of the bag, and a plurality of ring portions that maintain the opening and the inside of the bag in an expanded state, and the bag on at least one of the plurality of ring portions And a fixing tool for fixing. In such a case, since the bag is sufficiently and uniformly opened over the opening and inside of the bag, the amount of irradiation in the inner surface of the bag is increased, and the activation rate of the oxygen absorbing layer is further improved.

  The holding device may further include a connection member that connects the plurality of ring portions and restricts bending toward the inside of the bag. In such a case, the bending of the bag is suppressed by the connecting member, the opening and the inside of the bag can be opened more fully and uniformly, and the bag is held in a state where the opening and the inside are sufficiently and uniformly opened. Therefore, the activation rate of the oxygen absorption layer can be further improved. In addition, since the deflection of the bag is restricted and the bag and the ultraviolet lamp are maintained in a predetermined positional relationship (distance), the irradiation unevenness of the ultraviolet rays due to the deflection of the bag is suppressed, and the productivity is further increased. Furthermore, since the bag and the ultraviolet lamp are regulated in a predetermined positional relationship, the contact between the ultraviolet lamp and the bag can be reliably suppressed.

  The fixing tool may fix an unnecessary portion near the opening of the bag. In such a case, even if the bag is scratched or marked when the bag is fixed with the fixing tool, the fixed part is discarded, so that the part finally used as the bag may be scratched or marked. The quality of the bag can be improved.

  The ultraviolet lamp may be provided with a heat ray removing filter that removes heat rays from the emitted light. In such a case, since heat rays are removed from the emitted light, an increase in the temperature of the bag (surface temperature of the inner surface of the bag) is suppressed, and the bag can be prevented from being dissolved or deteriorated by heat.

  ADVANTAGE OF THE INVENTION According to this invention, the high activation rate of the oxygen absorption layer of a bag can be obtained stably, and the quality and productivity of a bag can be improved.

It is explanatory drawing which shows the outline of a structure of the ultraviolet irradiation device of embodiment. It is the figure which looked at the rotating drum from the back side. It is a perspective view of a holding device. It is a longitudinal cross-sectional view of a holding | maintenance apparatus. It is the figure which looked at the holding | maintenance apparatus from the front side. It is a block diagram of a rotating drum and its rotation drive device. It is explanatory drawing which looked at the trolley | bogie with which the holding | maintenance apparatus was mounted from the front side. It is explanatory drawing which shows an example of a structure of a bag. It is sectional drawing which shows an example of the layer structure of the inner bag of a bag. It is explanatory drawing which shows the ultraviolet irradiation device of the state which mounted | wore the holding | maintenance apparatus with the bag. It is explanatory drawing which shows the ultraviolet irradiation device of the state which has inserted the holding | maintenance apparatus in the rotating drum.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same element and the overlapping description is abbreviate | omitted. Further, the positional relationship such as up, down, left and right is based on the positional relationship shown in the drawings unless otherwise specified. Furthermore, the dimensional ratios in the drawings are not limited to the illustrated ratios. The following embodiments are examples for explaining the present invention, and the present invention is not limited only to the embodiments.

  FIG. 1 is an explanatory diagram showing an outline of the configuration of the ultraviolet irradiation device 1 of the present embodiment. FIG. 2 is an explanatory view of the internal structure of the ultraviolet irradiation device 1 as seen from the rear side. In the present embodiment, the main body side of the ultraviolet irradiation device 1 shown in FIG. 1 is the front (left in FIG. 1), and the side where the holding device 10 to be described later is put in and out is the rear (right in FIG. 1).

  As illustrated in FIG. 1, the ultraviolet irradiation device 1 includes a holding device 10 that holds a bag A having an oxygen absorption layer in a state where an opening A1 and an inside A2 thereof are opened, and a bag A that is held by the holding device 10. An ultraviolet lamp 11 that emits ultraviolet light inside the bag A, a rotation driving device 12 that rotates the bag A of the holding device 10 relative to the ultraviolet lamp 11, and a holding device. And a carriage 13 on which the apparatus 10 is placed and moved.

  The ultraviolet lamp 11 is extended along the rotation axis direction X of the bag A, for example, and irradiates ultraviolet rays downward. The ultraviolet lamp 11 has an elongated irradiation region that is long in the rotation axis direction X from the opening A1 side to the bottom side on the inner surface of the bag A and has a predetermined width in the circumferential direction around the rotation axis. In the present embodiment, a high-pressure mercury lamp with a cooling function is used as the ultraviolet lamp 11. The ultraviolet lamp 11 is preferably one that emits ultraviolet light having a wavelength of 10 to 400 nm, and more preferably one that emits ultraviolet light having a wavelength of 200 to 380 nm. A water-cooling pipe 20 and an air-cooling pipe 21 are connected to the ultraviolet lamp 11 from the outside, and the ultraviolet lamp 11 is cooled by supplying water or air to the ultraviolet lamp 11. . Further, a heat ray removing filter 22 is provided below the ultraviolet lamp 11 so as to cover the lower surface, and heat rays are removed from the light emitted from the ultraviolet lamp 11. In order to suppress an increase in the inner surface temperature when the inner surface of the bag A is irradiated with ultraviolet rays, the ultraviolet irradiation device 1 may be provided with cooling equipment such as a cooling nozzle. With such cooling equipment, for example, gas can be sprayed onto the inner surface of the bag A to actively cool the inner surface of the bag A. The ultraviolet lamp 11 is provided with a safety shutter (not shown). The safety shutter is closed except when the bag A is irradiated to prevent the operator from being exposed to ultraviolet rays.

  As shown in FIGS. 3 to 5, the holding device 10 includes two ring portions 30 and 31 arranged coaxially, a connection member 32 that connects the front ring portion 30 and the rear ring portion 31, and a front ring portion. 30 has a magnet 33 as a fixture for fixing the opening A1 of the bag A.

  The front ring portion 30 is made of metal, for example, and has a predetermined width in the rotation axis direction X as shown in FIG. The diameter of the front ring portion 30 is set to be equal to or smaller than the diameter of the opening A1 according to the diameter of the opening A1 of the bag A. The rear ring portion 31 is made of, for example, the same metal as the front ring portion 30 and has a smaller diameter than the front ring portion 30. Further, the distance between the front ring portion 30 and the rear ring portion 31 is formed in accordance with the length of the bag A.

  The connection members 32 are formed in, for example, a metal rod shape, and are provided at equal intervals at four locations on the circumference of the front ring portion 30 and the rear ring portion 31 as shown in FIG. As shown in FIG. 4, the four connecting members 32 proceed in parallel from the front ring portion 30 toward the rear ring portion 31 while being positioned on the same circumference as the front ring portion 30 and immediately before the rear ring portion 31. It is bent inward and connected to the rear ring portion 31.

  The magnet 33 is formed in a columnar shape, for example. The magnet 33 is attached to the front ring portion 30 with the bag A (opening portion A1 of the bag A) sandwiched therebetween, whereby the bag A is fixed to the outer periphery of the front ring portion 30.

  As shown in FIG. 3, a connection plate 40 and a cylindrical body 41 connected by the connection plate 40 are provided on the outer periphery of the front ring portion 30. The cylindrical body 41 is disposed coaxially with the front ring portion 30 and is, for example, a punching metal. A notch 42 is formed on the front side of the cylindrical portion 41 so that the magnet 33 can be easily attached to the front ring portion 30. The notches 42 are formed at equal intervals, for example, at four locations in the circumferential direction of the cylindrical body 41. The connection plate 40 connects the forefront surface of the cylindrical body 41 and the forefront surface of the front ring portion 30 at a portion where the notch 42 is not provided. Note that the notches 42 do not have to be four places, and may be, for example, two places.

  On the outer surface of the cylindrical body 41, a guide 50 is formed as a locking portion that is locked to a rail 70 described later. The guides 50 are formed on both sides of the cylindrical body 41 with the maximum horizontal diameter. The guide 50 is formed in a horizontal plate shape extending along the axial direction of the cylindrical body 41, for example, and is formed from the front of the front ring portion 30 to the rear of the rear ring portion 31. A handle 51 is provided on the upper surface on the rear side of the guide 50.

  As shown in FIGS. 2 and 6, the rotation drive device 12 surrounds the ultraviolet lamp 11 around the rotation axis, and a rotation drum 60 that can fix the holding device 10 inside, and a drive unit 61 that rotationally drives the rotation drum 60. And have.

  The rotating drum 60 is made of metal, for example, and is formed in a cylindrical shape having a diameter larger than that of the cylindrical body 41 of the holding device 10. The rotating drum 60 has a length that can accommodate the holding device 10. As shown in FIG. 1, the apparatus main body including the ultraviolet lamp 11, the water-cooling pipe 20, the air-cooling pipe 21, and the support is on the front side of the rotary drum 60, and the ultraviolet lamp 11 is on the front side of the rotary drum 60. Is inserted.

  As shown in FIGS. 2 and 6, a rail 70 is provided on the inner surface of the rotary drum 60 as a locked portion that locks the guide 50 of the holding device 10. The rail 70 is formed over both ends of the rotating drum 60 along the rotation axis direction X of the rotating drum 60. The rail 70 is formed by, for example, two plates arranged in parallel with a gap. The rail 70 is provided at two locations facing each other on the same diameter on the inner surface of the rotary drum 60. The guide 50 of the holding device 10 is detachable with respect to the rail 70, and is slidable along the rail 70 while being inserted into the rail 70.

  The rotating drum 60 is supported by a plurality of rotating bodies 80 that are in contact with the outer peripheral surface thereof. The plurality of rotating bodies 80 are connected to a driving unit 61 that is a motor, for example, via a transmission mechanism such as a rotating belt 81, a pulley 82, and a rotating shaft 83. The rotating body 80 is rotated by the drive of the driving unit 61, and the rotating drum 60 in contact with the rotating body 80 is rotated at a desired speed by the rotation of the rotating body 80. The rotating drum 60 may be shiftable by the drive unit 61, and the rotation direction may be changeable.

  As shown in FIG.1 and FIG.7, the trolley | bogie 13 is with a caster, for example, the external shape is formed in the rectangular parallelepiped shape. A slide mechanism 110 for placing the holding device 10 and sliding it back and forth is provided on the upper surface of the carriage 13. The slide mechanism 110 includes a roller 111 arranged in the front-rear direction, and a horizontal plate 112 disposed above the roller 111 with a gap into which the guide 50 of the holding device 10 enters. The holding device 10 is slidable on the carriage 13 with the guide 50 of the holding device 10 being inserted between the roller 111 and the horizontal plate 112. Further, the height of the guide 50 of the holding device 10 placed on the carriage 13 corresponds to the height of the rail 70 of the rotary drum 60, and the carriage 13 is moved in and out of the rail 70. The holding device 10 placed thereon can be taken in and out of the rotary drum 60.

  As shown in FIG. 1, the rotating drum 60 is surrounded by a curtain 120 that blocks ultraviolet rays. Further, the curtain 120 on the rear side of the rotating drum 60, that is, on the side where the holding device 10 is inserted and removed is freely openable and closable.

  Next, the ultraviolet irradiation process of the bag A using the ultraviolet irradiation device 1 configured as described above will be described.

  First, a bag A is prepared. The bag A is a heavy-duty bag that contains, for example, 5 kg or more of powders and granules of industrial chemicals, grains, fertilizers, etc., and has a size of, for example, 300 mm wide × 600 mm long. As shown in FIG. 8, the bag A includes an inner bag 130 made of a deoxidizing multilayer body (see FIG. 9) having an oxygen absorbing layer 141, and an outer bag 131 such as a paper bag covering the inner bag 130. Yes. The inner bag 130 is formed longer than the outer bag 131 in the vertical direction. For example, a part of the portion 130 a protruding from the outer bag 131 of the inner bag 130 becomes an unnecessary portion.

  Hereinafter, the inner bag 130 of the bag A will be described in detail. The inner bag 130 of the bag A of this embodiment has a three-layer structure as shown in FIG. 9, and has a heat seal layer 140, an oxygen absorption layer 141, and a gas barrier layer 142 in this order from the inside to the outside. ing.

The heat seal layer 140 is not particularly limited as long as it can be heat sealed by application of heat, and a known material in the art can be appropriately used. For example, the heat seal layer 140 has a melt flow rate of 0.1 to 4.5 g / 10 min from the viewpoint of increasing the impact strength and increasing the oxygen permeability and increasing the oxygen absorption rate by the oxygen absorbing layer 141. It is preferable that the oxygen permeability is 100 cc / m ² · d · atm (25 ° C., 90% RH) or more of a resin composition such as metallocene polyethylene.

  The oxygen absorbing layer 141 is not particularly limited as long as the oxygen absorbing function is activated by irradiation with a certain amount or more of ultraviolet rays, and a known material in the art can be used as appropriate. The oxygen absorption layer 141 includes, for example, a metallocene polyethylene having a melt flow rate of 0.1 to 4.5 g / 10 min, an easily oxidizable thermoplastic resin, a transition metal catalyst, and a photoinitiator having an absorption maximum at a wavelength of 10 to 400 nm. It is preferable that it is comprised from the oxygen absorptive resin composition containing at least. The oxygen absorbing function of the oxygen absorbing layer 141 is activated by applying radiation such as electron beams, α rays, β rays, γ rays, X rays, and external energy such as heat, high frequency, and ultrasonic waves together with ultraviolet rays. It can also be made.

  Specific examples of the easily oxidizable thermoplastic resin of the oxygen absorbing layer 141 include, for example, 1,4-polybutadiene, 1,2-polybutadiene, 1,4-polyisoprene, 3,4-polyisoprene, styrene butadiene rubber, styrene. -Butadiene-styrene block copolymer, styrene-isoprene-styrene block copolymer, ethylene-methyl acrylate-cyclohexenylmethyl acrylate copolymer, and the like. Specific examples of the transition metal catalyst include cobalt octylate. , Manganese octylate, cobalt neodecanoate, manganese naphthenate, iron naphthenate, cobalt stearate, etc. Specific examples of photoinitiators include fluorenones, benzophenones and their derivatives, thiazine dyes, metal porphyrins Derivatives, anthraquinone derivatives, hydro Shi alkylphenones derivatives, such aminoalkylphenone derivatives include, but are not particularly limited thereto.

The gas barrier layer 142 is not particularly limited as long as it prevents oxygen and water vapor from entering from the outside to the inside of the bag A when the bag A is sealed. it can. For example, the gas barrier layer 142 has an oxygen permeability of 10 cc / m ² · d · atm (25 ° C., 90% RH) or less and a water vapor permeability of 50 g / m ² · d (25 ° C., 90% RH) or less. It is preferable that it is made of a material. As such a gas barrier layer 142, for example, a stretched nylon film, an aluminum foil, and a PET film are bonded together by dry lamination in this order, and the oxygen permeability is 10 cc / m ² · d · atm (25 ° C., 90% RH) or less and a water vapor permeability of 50 g / m ² · d (25 ° C., 90% RH) or less. In addition, low oxygen permeability such as polyesters such as polyethylene terephthalate, polyamides such as nylon 6 and nylon MXD6, chlorine-containing resins such as polyvinyl chloride and polyvinylidene chloride, and ethylene-vinyl alcohol copolymers. Low oxygen-permeable laminated films such as resins, coated products thereof; metal foils such as aluminum or metal-deposited resins; inorganic compound-deposited resins such as silicon oxide are known in the art.

  Next, after the bag A is prepared, the bag A is attached to the holding device 10 on the carriage 13 as shown in FIG. At this time, the bag A is covered from the rear ring portion 31 toward the front ring portion 30 with the opening A1 being opened, and the opening A1 of the bag A (the protrusion of the inner bag 130 is projected on the outer surface of the front ring portion 30. Position portion 130a). At this time, the front ring portion 30 and the rear ring portion 31 are arranged inside the bag A, and the bottom side of the bag A is regulated by the rear ring portion 31 and is sufficiently and stably opened, and by the weight of the bag A. Deflection is regulated by the connecting member 32. Then, the magnet 33 is attached to the front ring portion 30 from above the opening A1 of the bag A in the opening A1 that is an unnecessary portion of the bag A. Thus, the bag A is stably held by the holding device 10 with the opening A1 and the inside A2 sufficiently and uniformly opened.

  Next, as shown in FIG. 11, the carriage 13 is moved to the rear end side of the rotating drum 60, and the front of the holding device 10 and the rear of the rotating drum 60 are brought close to each other. Next, the holding device 10 on the carriage 13 is slid forward by the slide mechanism 110, the guide 50 of the holding apparatus 10 is inserted into the rail 70 of the rotating drum 60, and the holding apparatus 10 is transferred from the carriage 13 to the rotating drum 60. It is. The holding device 10 is inserted into the inner side of the rotating drum 60 and accommodated in the rotating drum 60, whereby the holding device 10 is fixed to the rotating drum 60. Then, the ultraviolet lamp 11 is inserted inside the bag A held by the holding device 10. Next, the carriage 13 is retracted from the rotating drum 60 and the curtain 120 is closed.

  Thereafter, the rotating drum 60 is rotated by the drive unit 61, and a safety shutter (not shown) of the ultraviolet lamp 11 is opened, and irradiation of ultraviolet rays from the ultraviolet lamp 11 to the inner surface of the bag A is started. At this time, the heat ray is removed from the light of the ultraviolet lamp 11 by the heat ray removing filter 22. Then, the ultraviolet rays are irradiated to a rectangular region that is a part of the inner surface of the bag A and is long in the axial direction, and the irradiation region is moved by the rotation of the rotating drum 60, and the ultraviolet rays are applied to the entire inner surface of the bag A Irradiated. In this way, a target amount of ultraviolet rays is irradiated to the inside of the bag A, and the oxygen absorbing function of the oxygen absorbing layer 141 is activated.

  When the irradiation of ultraviolet rays for a predetermined time is completed, the emission of the ultraviolet lamp 11 is stopped and the rotation of the rotary drum 60 is stopped. At this time, the safety shutter (not shown) of the ultraviolet lamp 11 is also closed.

  Next, the carriage 13 is brought close to the rotating drum 60 again. Then, the holding device 10 is pulled backward from the rotary drum 60, the guide 50 of the holding device 10 is returned onto the slide mechanism 110 of the carriage 13, and the holding device 10 is transferred from the rotary drum 60 to the carriage 13. Thereafter, the carriage 13 is moved to a predetermined location, and the bag A is removed from the holding device 10. Then, after the contents are accommodated and filled with an inert gas such as nitrogen gas, the opening A1 is closed. Note that the opening A1 may be closed immediately after the contents are accommodated.

  According to the present embodiment, since the holding device 10 can open the bag A sufficiently and stably, the irradiation amount in the inner surface of the bag A is stabilized, and the high activation rate of the oxygen absorption layer 141 is stabilized. Can be obtained.

  Since the ultraviolet irradiation device 1 includes the rotation driving device 12 that rotates the bag A with respect to the ultraviolet lamp 11, the ultraviolet irradiation can be stably performed on the inner side surface of the bag A without unevenness.

  Further, the ultraviolet lamp 11 irradiates ultraviolet rays to a part of the inner surface of the bag A that is long in the rotation axis direction X and around the rotation axis, and rotates the bag A with respect to the ultraviolet lamp 11 to irradiate ultraviolet rays. Therefore, the same part of the inner surface of the bag A is not continuously irradiated, and the temperature of the bag A (surface temperature of the inner surface of the bag A) can be suppressed from being excessively increased by the irradiation heat. Thereby, even if it is the bag A of a material weak to a heat | fever, ultraviolet irradiation can fully be performed. That is, since the ultraviolet irradiation device 1 can sufficiently irradiate ultraviolet rays even with the bag A having low heat resistance, the technical significance thereof is particularly enhanced when the bag A having low heat resistance is used. It will be. Specifically, for example, a material having lower heat resistance can be used as the material of the heat seal layer 140, which is preferable because the degree of freedom in selecting the material of the heat seal layer 140 is increased. On the other hand, since the temperature of the bag A does not rise, the output of the ultraviolet lamp 11 can be increased, thereby shortening the ultraviolet irradiation time.

  The rotation driving device 12 includes a rotating drum 60 that surrounds the ultraviolet lamp 11 around the rotation axis and can fix the holding device 10 inside, and a driving unit 61 that drives the rotation drum 60 to rotate. Can be appropriately performed with a simple configuration. Moreover, since the ultraviolet rays of the ultraviolet lamp 11 are blocked by the rotating drum 60, the ultraviolet rays can be prevented from leaking to the outside.

  The rotary drive device 12 includes a rotating body 80 that contacts the outer surface of the rotary drum 60, and the drive unit 61 rotates the rotary drum 60 by rotating the rotary body 80. It can be provided outside, the configuration inside the rotating drum 60 can be simplified, and the irradiation from the ultraviolet lamp 11 to the bag A in the rotating drum 60 can be performed more easily and appropriately.

  The ultraviolet irradiation device 1 has a rail 70 provided on the inner surface of the rotary drum 60 and a guide 50 provided on the holding device 10, and the guide 50 is locked to the rail 70, whereby the holding device 10 is moved to the rotary drum. Therefore, the holding device 10 can be appropriately fixed to the rotating drum 60 with a simple configuration. The rail 70 extends along the axial direction on the inner surface of the rotary drum 60, and the guide 50 can be inserted into and removed from the rail 70, and can slide along the rail 70 while being locked to the rail 70. Therefore, the holding device 10 can be suitably put in and out of the rotating drum 60, and the bag A can be exchanged easily.

  The ultraviolet lamp 11 is inserted from the opening at the front of the rotating drum 60, and the holding device 10 can be taken in and out of the rotating drum 60 from the opening side at the rear of the rotating drum 60. Can be easily put in and out.

  The ultraviolet irradiation device 1 has a carriage 13 on which the holding device 10 is placed and moved. The carriage 13 has a slide mechanism 110 for sliding the holding device 10 back and forth, and the slide mechanism 110 moves the holding device 10. By moving back and forth, the holding device 10 can be taken in and out of the rotary drum 60. Thereby, the operation | work which moves the holding | maintenance apparatus 10 with which the bag A was attached, and takes in / out the holding | maintenance apparatus 10 with respect to the rotating drum 60 becomes easy, and the replacement | exchange operation | work of the bag A can be performed easily.

  The holding device 10 is disposed inside the bag A, and includes a front ring portion 30 and a rear ring portion 31 that maintain the inside A2 of the bag A in an expanded state, and a magnet 33 that fixes the bag A to the front ring portion 30. Therefore, the opening A1 and the inside A2 of the bag A are sufficiently opened, and the irradiation amount in the inner side surface of the bag A is increased, so that the activation rate of the oxygen absorbing layer 141 can be further improved.

  Since the holding device 10 has a connection member 32 that connects the front ring portion 30 and the rear ring portion 31 and can suppress the bending of the bag A, the opening A1 and the inside A2 of the bag A are opened sufficiently and uniformly. Can do. Therefore, the activation rate of the oxygen absorption layer 141 can be further improved by stably irradiating the inner surface of the bag A with ultraviolet rays.

  Since the magnet 33 fixes an unnecessary portion near the opening A1 of the bag A, the portion finally used as the bag A is not scratched or marked, and the quality of the bag A can be improved.

  Since the ultraviolet ray lamp 11 is provided with a heat ray removing filter 22 that removes heat rays from the emitted light, the temperature rise of the bag A due to light irradiation is suppressed, and the bag A including the oxygen absorbing layer 141 is dissolved or heated. Deterioration can be prevented.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, this invention is not limited to this example. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the idea described in the claims, and these naturally belong to the technical scope of the present invention. It is understood.

  For example, in the above-described embodiment, an ultraviolet irradiation device that does not include the rotation drive device 12 can be applied. In this case, for example, an ultraviolet lamp 11 that can irradiate ultraviolet rays in all directions of 360 degrees is applicable. In the above-described embodiment, the rotation driving device 12 rotates the rotating drum 60 with respect to the ultraviolet lamp 11, but the ultraviolet lamp 11 side may be rotated. Further, in the above-described embodiment, the holding device 10 and the rotating drum 60 are locked by the guide 50 and the rail 70, but may be locked by other configurations. In the above-described embodiment, the carriage 13 may have other configurations and is not necessarily required. Further, in the above-described embodiment, the holding device 10 includes two ring portions, but the number thereof can be arbitrarily selected. In the above-described embodiment, the magnet 33 that fixes the bag A is adhered to the front ring portion 30, but is adhered to at least one of the front ring portion 30 or the rear ring portion 31. May be. Furthermore, in the embodiment described above, the fixing tool for fixing the bag A is the magnet 33, but it may be fixed by other means.

  The bag A irradiated with ultraviolet rays has a three-layer structure, but in the present invention, the oxygen absorbing function of the oxygen absorbing layer of the bag A is activated by irradiating the inside of the bag A with ultraviolet rays. If it is a thing, it is applicable also to the bag which has another structure. Moreover, this invention is applicable also to the bag which accommodates substances other than industrial chemicals, grains, and fertilizers. Furthermore, the ultraviolet irradiation device 1 according to the present invention is suitable for a large bag having a width of 190 × 150 mm or more, more preferably a width of 200 × 200 mm to a width of 1500 × 1500 mm. Moreover, the ultraviolet irradiation device 1 is suitable for a bag having a low heat resistant temperature of 200 ° C. or lower, more preferably 60 to 120 ° C.

When ultraviolet rays were irradiated to the bag A of 540 × 780 mm using the ultraviolet irradiation device 1 described in the above embodiment (M09-L32D, manufactured by Eye Graphics Co., Ltd. as the ultraviolet lamp 11), oxygen in the bag A Ultraviolet rays of 880 mJ / cm ² or more that activate the oxygen absorbing function were irradiated in 70% or more of the total area of the absorption layer 141. Here, the ultraviolet lamp 11 is set to a high output so that 880 mJ / cm ² necessary for activation of the oxygen absorption function can be obtained by irradiation for 40 seconds, but the inner surface temperature of the bag A is the heat resistant temperature of the bag A. Was maintained at a temperature lower than 120 ° C.

  The ultraviolet irradiation device of the present invention can be widely and effectively used for activating the oxygen absorbing function of bags for packaging, packing or storage of various articles requiring high deoxygenation performance. It is particularly useful in bags having a relatively large capacity and a deep bottom that are difficult to hold in a stable open state.

DESCRIPTION OF SYMBOLS 1 Ultraviolet irradiation device 10 Holding device 11 Ultraviolet lamp 12 Rotation drive device 13 Carriage 60 Rotation drum 61 Drive part 141 Oxygen absorption layer A Bag A1 Opening part A2 Inside

Claims (13)

An ultraviolet irradiation device for irradiating ultraviolet rays on the inside of a bag having an oxygen absorption layer to activate the oxygen absorption function of the oxygen absorption layer,
A holding device for holding the bag with its opening and inside open;
An ultraviolet lamp that can be inserted into the inside from the opening of the bag held by the holding device and emits ultraviolet light inside the bag,
UV irradiation device. A rotation driving device for rotating the bag held by the holding device and the ultraviolet lamp inserted into the bag relative to the insertion axis of the ultraviolet lamp;
The ultraviolet irradiation device according to claim 1. The ultraviolet lamp irradiates a part of the region around the rotation axis with ultraviolet rays long in the rotation axis direction on the inner surface of the bag,
The ultraviolet irradiation device according to claim 2. The rotary drive device includes a rotary drum that surrounds the ultraviolet lamp around a rotation axis and can fix the holding device inside, and a drive unit that rotationally drives the rotary drum.
The ultraviolet irradiation device according to claim 3. The rotation driving device further includes a rotating body that contacts an outer surface of the rotating drum,
The drive unit rotates the rotary body to rotate the rotary drum.
The ultraviolet irradiation device according to claim 4. A locked portion provided on the inner surface of the rotating drum;
A holding portion provided in the holding device and locked to the locked portion,
Fixing the holding device to the rotating drum by locking the locking portion to the locked portion;
The ultraviolet irradiation device according to claim 4 or 5. The locked portion extends along the axial direction of the inner surface of the rotating drum,
The locking portion is detachable with respect to the locked portion, and is slidable along the locked portion while being locked to the locked portion.
The ultraviolet irradiation device according to claim 6. The ultraviolet lamp is inserted from one opening of the rotating drum,
The holding device can be taken into and out of the rotating drum from the other opening of the rotating drum.
The ultraviolet irradiation device according to any one of claims 4 to 7. Further comprising a carriage for placing and moving the holding device;
The carriage has a slide mechanism for sliding the holding device back and forth,
The holding device can be taken in and out of the rotating drum by sliding the holding device back and forth by the slide mechanism.
The ultraviolet irradiation device according to claim 8. The holding device is arranged along the axial direction on the inner side of the bag, and a plurality of ring portions that maintain the opening and the inside of the bag in an expanded state, and the bag on at least one of the plurality of ring portions A fixture for fixing,
The ultraviolet irradiation device according to claim 1. The holding device further includes a connection member that connects the plurality of ring portions and restricts bending to the inside of the bag,
The ultraviolet irradiation device according to claim 10. The fixing device fixes an unnecessary portion near the opening of the bag.
The ultraviolet irradiation device according to claim 10 or 11. The ultraviolet lamp is provided with a heat ray removing filter for removing heat rays from the emitted light.
The ultraviolet irradiation device according to claim 1.

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