JP4830463B2 - Continuous heating device - Google Patents

Description

The present invention relates to a continuous pressurized thermal device, without causing wrinkles and unevenness in the film when heat-shrinkable film (shrink film) was allowed to heat shrinking in a continuous heating apparatus to be mounted body such as a container (shrink oven) mounted In particular, it is suitable for heating and mounting on a deformed bottle whose cross-sectional shape is not constant.

  Using a container such as a glass bottle, metal can, plastic bottle, etc. as a body to be attached and covering with heat-shrinkable film (shrink film) for packaging and label attachment, and then using a tunnel-like continuous heating device (shrink oven) It is carried out by being continuously heat-shrinked while being conveyed.

  In order to mount such a heat-shrinkable film on a substrate by heat-shrinking, it is important to uniformly heat and shrink the film to prevent wrinkles and unevenness. The heating device was divided into several zones, side chambers were arranged on both sides of each zone, and hot air or steam was blown from a number of pipe nozzles attached to the third chamber.

  However, since hot air or the like is blown from both sides, the front and rear heating of the mounted body may be insufficient, and various proposals have been made to solve this problem.

  For example, in the shrink tunnel of Patent Document 1, hot air or steam is applied obliquely from behind in the transfer direction.

Moreover, in the heating apparatus of Patent Document 2, four nozzles N are arranged around the bottle B conveyed to the heating center O, as shown in a schematic plan view in FIG. The air is heated by blowing hot air in a direction inclined at an angle θ to generate vortices.
Japanese Utility Model Publication No. 6-39713 JP 2003-81219 A

  However, when hot air is blown obliquely from behind in the transfer direction, there is a problem that the front heating tends to be insufficient.

  In addition, when hot air is blown to form a vortex, the hot air blown from each nozzle N acts to separate the hot air from the adjacent nozzles from the mounted body, and cannot be used effectively for heating. There is a problem that the heat-shrinkable film placed on the outside of the bottle moves or is unstable due to the swirling vortex, especially when the container that is the mounted body is a deformed bottle other than a cylindrical cross section (asymmetric three-dimensional shape) However, there is a problem that uniform vortices are not generated and these problems become more remarkable.

The present invention has been made in view of the above problems of the prior art, to provide a continuous pressurized thermal device be an irregular bottles can be mounted to prevent occurrence of wrinkles and unevenness uniformly heated It is what.

In order to solve the above-described problems of the prior art, the continuous heating apparatus according to claim 1 of the present invention is a continuous heating apparatus that heat-shrinks and mounts a heat-shrinkable film mounted on an object to be continuously transported. The heat-shrinking is performed by a pre-heating unit that pre-heats the heat-shrinkable film, and a main heating unit that is provided on the downstream side of conveyance of the pre-heating unit and shrinks and mounts the pre-heated heat-shrinkable film. The main heating unit is configured so that at least two pairs of slit nozzles are disposed at positions facing substantially point symmetry with respect to the heating center position assumed on the conveyance, and the heating unit between the preheating unit and the main heating unit partition plate, and a partition member made of the heat portion partition plate between the upstream side of the slit nozzle and the heating unit partition plate provided, hot air or steam towards the heating center position of at least a pair of the slit nozzle With spraying, it is characterized in that it has a recovery port portion for circulating the hot air or steam formed by the partition member.

According to a second aspect of the present invention, in addition to the configuration according to the first aspect , the preheating unit preheats the heat-shrinkable film to a temperature before the shrinkage start temperature, and the mounted body. It is characterized in that it can be temporarily fixed to a part of.

Moreover, continuous heating apparatus according to claim 3 of the present invention, example pressurized to the configuration of claim 1 or 2, wherein, those characterized in that the conveying direction on both sides the lower end of the front Symbol main heating section has a recovery port portion It is.

Furthermore, in addition to the structure in any one of Claims 1-3 , the continuous heating apparatus of Claim 4 of this invention comprises the said slit nozzle by 2 pairs, and makes all the slit nozzles to the said heating center position . It is characterized by spraying toward.

Moreover, in addition to the structure in any one of Claims 1-4 , the continuous heating apparatus of Claim 5 of this invention comprises the said slit nozzle by 2 pairs, and makes a pair of slit nozzle in the said heating center position . It sprays at an angle larger than the angle with respect to the direction orthogonal to the said conveyance direction larger than the angle with respect to the direction to which it turned.

Furthermore, in addition to the structure in any one of Claims 1-5 , the continuous heating apparatus of Claim 6 of this invention conveys at least the said to-be-mounted body by the conveyance means provided in the said main heating part. It is characterized by being a possible transport means.

Moreover, in addition to the structure in any one of Claims 1-6 , the continuous heating apparatus of Claim 7 of this invention is characterized by the said to-be-mounted body being a deformed bottle.

  Here, the irregularly shaped bottle means that a normal barrel portion is different from a bottle having a uniform cross-sectional shape such as a cylindrical shape or a rectangular shape. For example, as shown in FIG. Including the bottles B1 and B2 and the bottles B3 and B4 that are not uniform in the vertical direction even if the cross-sectional shape of the body portion is circular, this refers to asymmetric three-dimensional bottles.

According to the continuous heating apparatus of the first aspect of the present invention, the continuous heating apparatus is configured to heat-shrink and mount the heat-shrinkable film mounted on the mounted body that is continuously transported. A preheating unit that preheats the heat-resistant film, and a main heating unit that is provided on the downstream side of conveyance of the preheating unit and shrinks and attaches the preheated heat-shrinkable film, and this main heating unit, At least two pairs of slit nozzles are disposed at positions that are substantially point-symmetrical with respect to the virtual heating center position on the conveyance, the heating part partition plate between the preheating part and the main heating part, and the upstream slit the partition member made of the heat portion partition plate between the nozzle and the heating unit partition plate provided, with blowing hot air or steam towards the heating center position of at least a pair of the slit nozzle, the partition portion Because it has a recovery port portion for circulating the hot air or steam which is formed by conveying the preheated heat-shrinkable film to the heating section, at least at a position facing the substantially point symmetrical with respect to the heating center position virtually on the conveying By arranging two pairs of slit nozzles and blowing hot air or steam toward the center of heating from at least a pair of slit nozzles, it is possible to uniformly and sufficiently heat the portions located before and after the mounted body, By collecting and circulating hot air and steam after heating from the recovery port in the main heating unit, it is possible to prevent the occurrence of temperature control abnormalities in the preheating unit by suppressing the influence of hot air and steam on the preheating unit. In addition, it is possible to prevent the inlet side of the main heating unit from becoming high temperature.
Furthermore, the preheated part can be reduced by suppressing the influence of hot air and steam on the preheating part by collecting and circulating the hot air and steam after heating from the recovery port part inside the main heating part partitioned by the partition member. It is possible to prevent the occurrence of temperature control abnormalities at the same time and to prevent the inlet side of the main heating section from becoming hot.

  Thereby, even if it is an irregular shape bottle etc., it can heat | fever and shrink | contract and can be mounted | worn by heating uniformly and preventing generation | occurrence | production of a wrinkle and a nonuniformity.

Further, according to the continuous heating apparatus according to claim 2 of the present invention, the preheating unit, with pre-heating the heat-shrinkable film to shrink initiation temperature front, temporarily fixed can the part of the mounting member Since the film is preheated to the temperature before the shrinkage start temperature in the preheating part, the film can be prevented from moving by blowing hot air or steam in the main heating part by temporarily fixing the heat shrinkable film. At the same time, the film can be heated and shrunk to a more accurate position.

Furthermore, according to the continuous heating device of the third aspect of the present invention, since the recovery port portions are provided at the lower ends on both sides in the transport direction of the main heating portion, the heated hot air and the steam after the heating are partitioned by the partition member. By collecting and circulating from the recovery port in the main heating unit, it is possible to prevent the occurrence of temperature control abnormalities in the preheating unit by suppressing the influence of hot air and steam on the preheating unit, and the main heating It is also possible to prevent the entrance side of the section from becoming hot.

Furthermore, according to the continuous heating apparatus of the fourth aspect of the present invention, the slit nozzles are configured in two pairs, and all the slit nozzles are sprayed toward the heating center position , so that the surroundings are more evenly surrounded. It is possible to heat the heat shrinkable film and to prevent the occurrence of wrinkles and unevenness and to heat and shrink the heat shrinkable film.

According to the continuous heating apparatus of claim 5 of the present invention, the slit nozzles are configured in two pairs, and the pair of slit nozzles is larger than an angle with respect to the direction toward the heating center position and is orthogonal to the transport direction. Since the spraying is performed at an angle smaller than the angle with respect to the direction, the pair of slit nozzles toward the center of the two pairs of diagonal nozzles and the angle with respect to the direction toward the heating center is larger than the angle with respect to the transport direction. Even when hot air or steam is blown by combining a pair of slit nozzles having an angle smaller than the angle with respect to the direction to be applied, the portions positioned before and after the mounted body can be heated uniformly and sufficiently.

Furthermore, according to the continuous heating device of the sixth aspect of the present invention, since the conveying means provided in the main heating portion is a conveying means capable of sucking and conveying at least the mounted body, the contents are contained. It can be stably conveyed even in the absence of heat, and the heat-shrinkable film can be mounted by being heat-shrinked in a stable state.

Further, according to the continuous heating device of the seventh aspect of the present invention, even if the mounted body is a deformed bottle, the heat shrinkable film is uniformly heated and shrunk to prevent wrinkles and unevenness from being mounted. can do.

Hereinafter, an embodiment of a continuous heating device of the present invention will be described in detail with reference to the drawings.
1 to 4 relate to an embodiment in which the continuous heating apparatus of the present invention is applied to a shrink oven when a shrink label, which is a heat-shrinkable film, is attached to a deformed bottle by heat-shrinking, and FIG. FIG. 2 is a schematic longitudinal cross-sectional view, FIG. 3 is a schematic cross-sectional view, and FIG. 4 is a plan layout of slit nozzles.

  The continuous heating device 1 of the present invention is a heat-shrinkable film on a body to be mounted 2 such as a deformed bottle B1 having a cross-sectional shape of the body part already described in FIG. After covering the configured annular shrink label 3, it is heated and shrunk uniformly with hot air or steam to prevent wrinkles and unevenness from being attached.

  The continuous heating device 1 includes a tunnel-like heating unit 10 whose outer periphery is closed, and a transport device 13 for continuously transporting the mounted body 2 such as the deformed bottle B1 to the bottom portion of the heating unit. It is installed.

  The heating unit 10 of the continuous heating device 1 is divided into, for example, two zones, and a preheating unit 11 that heats the shrink label 3 to a level before the shrinkage start temperature is provided on the upstream side. A main heating section 12 for continuously shrinking and mounting the shrink label 3 is provided on the downstream side of X.

  The preheating unit 11 is provided with a hot air chamber 11b in which hot air or steam (hereinafter, described as an example of hot air) enters on both sides in the transport direction X of the tunnel-shaped preheating unit main body 11a. As shown in FIG. 2, these opposed hot air chambers 11b have a pipe nozzle system in which a nozzle plate 11c composed of a large number of holes is attached to uniformly blow hot air.

  The heating conditions such as the temperature and blowing range in the preheating unit 11 are set depending on the material and area of the shrink label to be heated and shrunk, the mounting position on the mounted body 2 such as a deformed bottle. By blowing at a temperature of 70 to 100 ° C., preferably 80 to 90 ° C. and a wind speed of 5 to 15 m / s, preferably about 10 m / s, the shrink label 3 is thermally shrunk while passing through the preheating unit 11. It heats up to just before it happens.

  Accordingly, the shrink label 3 that is placed on the mounted body 2 in the preheating unit 11 is heated relatively gently by the hot air blown from the nozzle plates 11c on both sides while being transported by the transport device 13. The entire shrink label 3 is heated uniformly.

  Further, when the preheating unit 11 is heated, the amount of hot air (or steam) sprayed may be partially increased to heat the shrink label 3 and temporarily fix the part to the mounted body.

Thereby, the shift | offset | difference of the shrink label 3 by the hot air and vapor | steam which are blown in the main heating part 12 during conveyance or the following process can be prevented.

  In the main heating unit 12 continuously installed in such a preheating unit 11, the preheated shrink label 3 can be uniformly heated and shrunk in a short time, and the mounted body 2 is a deformed bottle or the like. Since it is effective in suppressing the occurrence of wrinkles and unevenness, it can be heated in a short time by directly blowing a large amount of hot air.

  The main heating unit 12 includes a tunnel-shaped main heating unit main body 12a having the same outer shape as the preheating unit main body 11a, and a hot air chamber 12b in which hot air having a U-shaped cross section enters the main heating unit main body 12a. However, it is provided so that the lower part is opened.

  Then, in this hot air chamber 12b, as shown in FIG. 1, a certain heating position approaching the heating start position of the mounted body 2 transported by the transport device 13 is virtually set as a heating center position Oh. . The slit nozzles 12c that blow hot air toward the mounted body 2 that is transported to the heating center position Oh, which is the virtual position, face the point substantially symmetrical with respect to the heating center position Oh on both sides in the transport direction X of the hot air chamber 12b. At least two pairs are attached to the position, and here, as shown in FIG. 4A, the heating center is located at two pairs of diagonal positions passing through the heating center position Oh and intersecting the conveyance direction X at 45 degrees. Four slit nozzles 12c are arranged equidistant from the position Oh and are provided at four point symmetrical points.

  Therefore, at the heating center position Oh, which is the virtual position, the heat shrinkage is performed as a slit nozzle method in which hot air can be directly blown from the four slit nozzles 12c at the two front and rear positions of the mounted body 2.

  The heating conditions such as the temperature and blowing range in the main heating unit 12 are set according to the material and area of the shrink label to be heated and shrunk and the mounting position of the deformed bottle on the mounted body 2. For example, the temperature of the hot air is 100 to 180 ° C., preferably 120 to 160 ° C., and the wind speed is 20 to 50 m / s, preferably 30 m / s so that a large amount of hot air can be blown. Thus, the shrink label 2 can be uniformly contracted by heating in a short time at the heating center position Oh.

  Further, in this main heating section 12, since a large amount of hot air is blown, the hot air does not stay only in the main heating section main body 12a, but flows into the upstream preheating section main body 11a and abnormal temperature control in the preheating section. The hot air can be circulated because there is a risk of generating or flowing out from the downstream side.

  In the main heating unit 12, the heating unit partition plate 12d is disposed between the preheating unit main body 11a and the main heating unit partition plate as a partition member between the upstream slit nozzle 12c and the heating unit partition plate 12d. 12e is attached, and the flow of the hot air is blocked as a minimum opening through which the mounted body 2 can pass.

  And the suction port 12g of the hot air blower 12f is formed in the top | upper surface part of this heating part main body 12a, and the collection | recovery opening part 12h of the hot air after the heating injected into this heating part main body 12a is between two partition plates 12d and 12e. In addition, the suction air can be circulated from the downstream side of the hot air chamber 12b.

  In addition, a gap is formed between the bottom of the hot air chamber 12b to which the slit nozzle 12c is attached and the bottom of the main heating unit main body 12a to form a lower recovery port 12i. These two partition plates 12d, The hot air after heating from the recovery port portion 12h and the lower recovery port portion 12i between 12e is guided to the suction port 12g of the hot air blower 12f so as to be circulated.

  Accordingly, in the main heating unit 12, the hot air blown from the four slit nozzles 12c toward the shrink label 3 of the mounted body 2 at the heating center position Oh in the main heating unit main body 12a is heated and contracted by the shrink label 3. After being used, the outflow to the upstream side is blocked by the two partition plates 12d and 12e, is forcibly sucked and collected by suction by the hot air blower 12f, and circulates as hot air that is heated again and injected from the slit nozzle 12c. Is done.

  This prevents partial shrinkage due to partial heating of the shrink label 3 of the mounted body 2 due to overflow of hot air in front of the two slit nozzles 12c on the upstream side in the transport direction X, thereby preventing the four slit nozzles 12c from starting. Thus, the shrink label 3 can be uniformly shrunk and mounted without causing wrinkles or unevenness on the shrink label 3.

  Further, since the hot air is directly applied from the four directions around the four slit nozzles 12c, the shrink label placed on the outer side of the mounted body is compared with the case where the swirl is formed and heated as in the conventional example. The shrink label can be heated and contracted at a predetermined position in a stable state by being pressed from the outside without being moved to rotate or becoming unstable.

  Furthermore, by collecting and circulating the hot air, it is possible to prevent the hot air from flowing into the preheating unit, to prevent occurrence of temperature control abnormality in the preheating unit, and to heat the main heating unit. The temperature and the amount of air to be blown out can be easily controlled, and the shrink label 3 can be heated and contracted more efficiently.

  Since the shrink label 3 is heated and shrunk by blowing a large amount of hot air in this way, the mounted body 2 such as a container that transports inside the main heating unit 12 may be overturned by the hot air or may not be transported smoothly. In particular, when the mounted body 2 is a container or the like that is not filled with contents, it becomes a larger problem.

  Therefore, a vacuum blower (vacuum suction device) 12k is installed at the bottom of the transfer device 13 disposed in the main heating unit 12 to form a vacuum conveyor 13a. By conveying while sucking the bottom portion, it is possible to prevent the overturning and convey at a predetermined speed and interval.

  According to the continuous heating device 1 configured as described above, even a deformed bottle such as an asymmetric three-dimensional bottle can be mounted without causing wrinkles or unevenness by uniformly shrinking the shrink label.

  In addition, the shrink label can be heated and shrunk in a very short time to a deformed bottle transported to a heating center position by a large amount of hot air, so that the main heating part can be shortened and the continuous heating device 1 can be installed. Space can be reduced to save space.

  In the above embodiment, as shown in FIG. 4A, hot air is blown out from four slit nozzles at two diagonal positions passing through a virtual heating center position Oh. For example, as shown in FIG. 5B, among the four slit nozzles at two diagonal positions passing through the virtual heating center position Oh, the two slit nozzles 12c before and after the pair of diagonal positions are heated. Even if the two slit nozzles 12c ′ at the other pair of diagonal positions are arranged at an angle larger than the angle with respect to the direction toward the heating center Oh and smaller than the angle with respect to the direction perpendicular to the transport direction X, the heating is performed uniformly. Has been shown to be heat shrinkable.

  Further, according to the experiment, as shown in FIG. 4C, when spraying from the four slit nozzles toward the heating center position Oh, the diagonal positions (angles) of the two slit nozzles 12c at the diagonal positions are substantially the same. It has been found that even if two slit nozzles 12c ′ having a deviation of about ± 10 degrees are installed in combination, they can be heated and contracted uniformly.

  However, as shown in FIG. 5, even when spraying from four slit nozzles installed at two diagonal positions passing through the virtual heating center position Oh, at least a pair of diagonal nozzles are heated from the front and back. If it is not installed so as to spray toward the surface, it cannot be heated uniformly, and the shrink label will be wrinkled and uneven.

  Therefore, at least two pairs of slit nozzles are disposed at positions that are substantially point-symmetrical with respect to the heating center, virtually assuming the heating center position on the mounted object to be transported, and from at least one pair of slit nozzles, It is necessary to blow hot air or steam toward the heating center.

  In addition, the heating conditions of the preheating section and the main heating section are merely examples for description, and are not limited to these. Other heating conditions may be set as appropriate.

  Further, at least 2 to 4 slit nozzles are necessary, but the number of installed nozzles may be further increased.

  The heating medium is not limited to hot air, and steam may be used.

1 is a schematic plan view according to an embodiment in which a continuous heating device of the present invention is applied to a shrink oven when a shrink label, which is a heat-shrinkable film, is attached to a deformed bottle by heat-shrinking. It is a schematic longitudinal cross-sectional view concerning one Embodiment of the continuous heating apparatus of this invention. It is a schematic cross-sectional view concerning one Embodiment of the continuous heating apparatus of this invention. It is a plane arrangement drawing of the slit nozzle concerning each one embodiment of the continuous heating device of this invention. It is a plane arrangement | positioning figure of the slit nozzle as a comparative example in a continuous heating apparatus. It is explanatory drawing of the deformed bottle which is an example of the application object concerning one Embodiment of the continuous heating apparatus of this invention. It is a plane arrangement view of a nozzle of a conventional heating device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Continuous heating apparatus 2 Mounted object 3 Heat-shrinkable film (shrink label)
DESCRIPTION OF SYMBOLS 10 Heating part 11 Preheating part 11a Preheating part main body 11b Hot air chamber 11c Nozzle plate 12 Main heating part 12a Main heating part main body 12b Hot air chamber 12c Slit nozzle 12c 'Slit nozzle 12d Heating part partition plate 12e Main heating part inner partition plate 12f Hot air Blower 12g Suction port 12h Suction port 12i Lower recovery port 12j Vacuum chamber 12k Vacuum blower 13 Transport device 13a Vacuum conveyor Oh Heating center position X Transport direction

Claims (7)

A heating apparatus that heats and shrinks a heat-shrinkable film mounted on a substrate to be continuously transported, and that heat-shrinks, a preheating unit that preheats the heat-shrinkable film, and the preheating unit And a main heating part that shrinks and mounts a preheated heat-shrinkable film, and is substantially point-symmetric with respect to the heating center position virtually assumed on the main heating part and the conveyance. At least two pairs of slit nozzles are arranged at facing positions, and a heating unit partition plate between the preheating unit and the main heating unit, and a main heating unit partition plate between the upstream slit nozzle and the heating unit partition plate the partition member made of formed, circulating at least a pair of the slit nozzle with blowing hot air or steam towards the heating center position, hot air or steam formed by the partition member Continuous heating apparatus characterized by having a Osamukuchi portion. The continuous heating apparatus according to claim 1, wherein the preheating unit is configured to preheat the heat-shrinkable film to a temperature before the shrinkage start temperature and to be temporarily fixed to a part of the mounted body.   The continuous heating apparatus according to claim 1, wherein a recovery port portion is provided at a lower end portion on both sides in the transport direction of the main heating portion. The continuous heating apparatus according to any one of claims 1 to 3, wherein the slit nozzles are configured in two pairs, and all the slit nozzles are sprayed toward the heating center position . The slit nozzle is composed of two pairs, and the pair of slit nozzles is sprayed at an angle that is larger than an angle with respect to the direction toward the heating center position and smaller than an angle with respect to a direction orthogonal to the transport direction. 4. The continuous heating apparatus according to any one of 4 above.   The continuous heating apparatus according to claim 1, wherein the conveying unit provided in the main heating unit is a conveying unit capable of sucking and conveying at least the mounted body. The continuous heating apparatus according to claim 1, wherein the mounted body is a deformed bottle.

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