WO2015199221A1 - シュリンクラベルの加熱収縮装置 - Google Patents
シュリンクラベルの加熱収縮装置 Download PDFInfo
- Publication number
- WO2015199221A1 WO2015199221A1 PCT/JP2015/068511 JP2015068511W WO2015199221A1 WO 2015199221 A1 WO2015199221 A1 WO 2015199221A1 JP 2015068511 W JP2015068511 W JP 2015068511W WO 2015199221 A1 WO2015199221 A1 WO 2015199221A1
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- WO
- WIPO (PCT)
- Prior art keywords
- heat
- container
- shrink
- steam
- label
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65C—LABELLING OR TAGGING MACHINES, APPARATUS, OR PROCESSES
- B65C9/00—Details of labelling machines or apparatus
- B65C9/20—Gluing the labels or articles
- B65C9/24—Gluing the labels or articles by heat
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B53/00—Shrinking wrappers, containers, or container covers during or after packaging
- B65B53/02—Shrinking wrappers, containers, or container covers during or after packaging by heat
- B65B53/06—Shrinking wrappers, containers, or container covers during or after packaging by heat supplied by gases, e.g. hot-air jets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B53/00—Shrinking wrappers, containers, or container covers during or after packaging
- B65B53/02—Shrinking wrappers, containers, or container covers during or after packaging by heat
- B65B53/06—Shrinking wrappers, containers, or container covers during or after packaging by heat supplied by gases, e.g. hot-air jets
- B65B53/063—Tunnels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B53/00—Shrinking wrappers, containers, or container covers during or after packaging
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B61/00—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages
- B65B61/20—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for adding cards, coupons or other inserts to package contents
- B65B61/202—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for adding cards, coupons or other inserts to package contents for attaching articles to the outside of a container
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65C—LABELLING OR TAGGING MACHINES, APPARATUS, OR PROCESSES
- B65C3/00—Labelling other than flat surfaces
- B65C3/06—Affixing labels to short rigid containers
- B65C3/08—Affixing labels to short rigid containers to container bodies
- B65C3/14—Affixing labels to short rigid containers to container bodies the container being positioned for labelling with its centre-line vertical
Definitions
- This invention relates to a shrink / shrink device for shrink labels that heats and shrinks, for example, a cylindrical shrink label fitted in a plastic container filled with a liquid beverage.
- a label mounting system comprising: a label fitting device for fitting a non-shrinkable cylindrical label on a plastic container conveyed by a conveyer; and a heat shrinking device for heating and shrinking the cylindrical label fitted on the plastic container In general, it is attached to a plastic container continuously.
- the heat-shrinking device mounted on such a label mounting system includes a heat treatment chamber installed so as to surround a conveyance conveyor that conveys a container fitted with a cylindrical label, and a container that passes through the heat treatment chamber.
- a heating device for heating the fitted cylindrical label with hot air or steam is provided, and the cylindrical label is heated and shrunk while the container passes through the heat treatment chamber (Patent Document 1).
- the “water vapor” used in the present application refers to water vapor having a temperature of 100 ° C. or less under the condition of 1 atm.
- the cylindrical label when the cylindrical label is heated with water vapor, the entire cylindrical label can be uniformly heat-shrinked, so the design and characters printed on the cylindrical label are hard to be distorted and can be finished neatly.
- a large amount of water droplets adhere to the surface of a plastic label or a plastic container.
- a cylindrical label is attached to a plastic container before filling a content such as a liquid beverage, a large amount of water droplets adhere to the inside of the plastic container, which is a particular problem.
- an object of the present invention is to uniformly shrink a shrink label covering a part or all of an article, and to finish the article or the surface of the shrink label without water droplets.
- An object of the present invention is to provide a heat shrink device for shrink labels.
- the invention according to claim 1 is directed to a heat treatment chamber that encloses a conveyance path of a label covering in which a part or all of an article is covered with a shrink label, and superheated steam is supplied into the heat treatment chamber.
- the steam supply device that heat-shrinks the shrink label of the label covering that passes through the heat treatment chamber, the heated air generation device that generates heated air at a predetermined temperature, and the heat treatment chamber that is supplied with superheated steam
- a heated air generating device that evaporates the water droplets by spraying the heated air generated by the heated air generating device on the label covering to which the water droplets have adhered, and the heated air generating device is a surplus in the heat treatment chamber.
- the “superheated steam” used in the present application is water vapor having a temperature higher than 100 ° C. and not higher than 300 ° C. under the condition of 1 atm, preferably 120 ° C. to 300 ° C., more preferably 160 ° C. to It means 180 ° C. water vapor, which is different from the “water vapor” described above.
- the invention according to claim 2 is characterized in that, in the heat shrink device for shrink labels of the invention according to claim 1, a steam condensing device for cooling and condensing excess water vapor in the heat treatment chamber is provided.
- the shrink label covering part or all of the article is heated and shrunk by the superheated steam supplied into the heat treatment chamber.
- the design and characters printed on the shrink label are not easily distorted and can be finished beautifully.
- the heated air spraying device is adapted to evaporate by spraying heated air of a predetermined temperature, so the shrink label should be attached to the article with no water droplets attached to the surface of the label covering. Can do. Therefore, when a cylindrical shrink label is attached to an empty plastic container, the contents are subsequently filled, or a food containing a cup, a paper container, or a paper label that does not like moisture is attached. It can also be applied to the above.
- the heated air generating device has a preheating device that preheats the air by using excess water vapor in the discharged heat treatment chamber, so that the label coating is used to evaporate a few water droplets adhering to the label covering. Heated air having a predetermined temperature to be blown onto the body can be efficiently generated, and energy efficiency is also good.
- Superheated steam is 1) Unlike water vapor whose supply temperature is 100 ° C or less, the supply temperature can be freely set in a temperature range exceeding 100 ° C. 2) Since the heat capacity is larger than that of heated air, Compared to heating, the heated object can be heated more rapidly. 3) Heated air is only transferred by convection, but superheated steam is combined by convection, radiation and condensation. Since heat is transferred and heat transfer by convection is more than 10 times that of heated air, it has the characteristic that the heating efficiency is much better than heated air.
- the temperature at which the superheated steam is supplied is much higher than about 100 ° C., for example, 160 ° C., which is a heat shrink temperature for shrinking various shrink labels to their respective shrinkage rates.
- the shrink label covering the article that has entered the heat treatment chamber will instantaneously shrink to the limit shrinkage, and when heated by heated air at the same temperature or by steam Compared with the case of heating, the passage time in the heat treatment chamber can be extremely shortened. Therefore, the length of the heat treatment chamber can be shortened, and the space for the heat shrinking device can be saved. In addition, the amount of steam supply can be reduced as compared with the case of heating with water vapor.
- the shrink shrink heating shrink device of the invention according to claim 2 is provided in the heat treatment chamber. Since it is equipped with a vapor condensing device that cools and condenses excess water vapor, it is only necessary to drain the excess water vapor as condensed water, and the image of the surroundings is better than when the extra water vapor is discharged outside as it is, There is an advantage that an exhaust duct or the like for discharging excess water vapor becomes unnecessary.
- (A) is a graph showing the fluctuation of the temperature in the cover with respect to the elapsed time at the start-up time of the heating / shrinking apparatus in Experiment No. A
- (b) is the elapsed time at the start-up time of the heating / shrinking apparatus in Experiment No. B.
- FIG. 1 shows that a plastic container (hereinafter referred to as a container) PC before being filled with a liquid beverage is transported by a transport conveyor C while a cylindrical shrink label L is attached to the body of the container PC, and then the cylindrical label is placed.
- a heat-shrink device 1 for a cylindrical label L that is installed in a liquid beverage filling line that fills and seals a liquid beverage in a container PC to which L is mounted.
- the fitted non-shrinkable cylindrical label L is heat-shrinked by the heat-shrink device 1 so as to be brought into close contact with the body portion of the container PC.
- the heat-shrinking device 1 includes a heat treatment chamber 2 through which a conveyor C that conveys a container PC fitted with a cylindrical label L passes, the front surface of which can be opened and closed by a door 2a, and various types.
- the device stacking unit 3 in which the above devices and pipes are arranged, and a control panel 4 for controlling various devices, are installed in the upper part of the heat treatment chamber 2.
- the heat treatment chamber 2 is heat-shrinkable with a heat-shrink zone ZA that heats the cylindrical label L fitted on the container PC using heat-heated steam in order to heat-shrink.
- a cover 11 having a thickness of 1.5 mm and made of stainless steel that can be opened and closed is provided around the transport path of the container PC.
- the thickness of the cover 11 is preferably 1.5 mm from the conventional cover of about 1.2 mm from the viewpoint of high heat retaining properties and the possibility of dew condensation.
- a pair of steam discharge units 12 having a plurality of discharge holes 12a for discharging superheated steam laterally on both sides in the width direction of the conveyor C, and a pair of steam
- a pair of steam discharge nozzles 13 for discharging superheated steam is disposed above, and the steam discharge unit 12 mainly includes the container PC in the front half of the container PC in the transport direction.
- the discharge holes 12a are arranged so as to heat the lower part and mainly the middle part and the upper part of the container PC in the latter half part.
- the cover 11 has a dome shape, and the cross-sectional shape in the direction (width direction) orthogonal to the transport direction of the container PC has a shape in which the upper portion 11a is curved in a semicircular arc shape as shown in FIG.
- the cross-sectional shape of the container PC in the transport direction has a shape in which upper end corner portions 11b at both ends in the longitudinal direction are curved in an arc shape as shown in FIG.
- the “semicircular arc shape” and “arc shape” mentioned here include not only a complete arc but also a trajectory such as an ellipse that is not a perfect circle.
- a cover having a similar cross-sectional shape in a direction perpendicular to the container transport direction is also provided in the conventional heat shrink device, but the conventional cover is provided on the upstream side and the downstream side in the container transport direction. Since the upper corner portion had a corner, dew condensation occurred on the upper inner surface near the inlet and outlet of the container. However, as described above, the cover 11 has a shape in which the upper end corners at both ends in the longitudinal direction are curved in an arc shape, so that dew condensation is formed on the upper inner surface of the cover 11 near the inlet and outlet of the container PC. Is less likely to occur.
- the upper corner portion at both end portions in the longitudinal direction of the cover 11 is curved in an arc shape as a whole at the upper side of the container PC to be transported.
- a region (a region in the height direction) R2 of at least about 30% of the height of the cover 11 is curved in a circular arc shape as a whole, and curved in a circular arc shape having a curvature radius of 70 mm or more.
- the cross-sectional shape in the direction (width direction) orthogonal to the transport direction of the container PC it is desirable to curve the upper part of the container PC to be transported in an arc shape as a whole.
- a region (region in the height direction) R3 of about 50 to 80% of the height H of the cover 11 is formed in an arc shape from the top of the cover 11 to the lower side.
- the superheated steam is supplied to the steam discharge nozzle 13 and is supplied to the upstream side in the transport direction of the container PC in the steam discharge unit 12 via the steam discharge nozzle 13.
- the container enters the cover with cold air, so the atmospheric temperature in the cover is lower on the upstream side than on the downstream side.
- the upstream discharge temperature in the container transport direction in the steam discharge unit is lower than the downstream discharge temperature, and condensation is formed upstream in the cover.
- the steam discharge nozzle 13 is disposed on the upstream side in the cover 11 to discharge superheated steam upward, and the superheated steam is discharged from the container PC in the steam discharge unit 12.
- the upstream discharge temperature in the transport direction of the container PC in the steam discharge unit 12 becomes higher than the downstream discharge temperature, and the upstream ambient temperature in the cover 11 is increased. It is difficult to decrease, and condensation is unlikely to occur on the upstream side in the cover 11.
- the experiment was performed twice. At startup, after warming up for 10 minutes, the inside of the cover 11 is heated in a state where the temperature of the super heater is set to 370 ° C. When the temperature in the cover reaches 150 ° C., the temperature of the super heater is changed. The point changed to 240 ° C. is common to both experiments. However, as shown in Table 1 and FIGS. The supply of the container PC was started after 5 minutes (inside cover temperature: 163 ° C., elapsed time: 42 minutes), whereas in experiment number B, 10 minutes passed from the time when the inside temperature of the cover reached 160 ° C. The supply of the container PC was started later (internal temperature: 163 ° C., elapsed time: 50 minutes). In the experiment described above, as shown in FIG. 8, the temperature of the upper space of the steam discharge unit 12 on the downstream side in the cover 11 was measured, and this was used as the temperature in the cover.
- the result of the experiment is that the experiment number A in which the supply of the container PC is started after the elapse of 5 minutes from the time when the temperature in the cover reaches 160 ° C. is shown in FIG. , Rc, Rd, while condensation has occurred, the experiment number B that started supplying the container PC 10 minutes after the temperature in the cover reached 160 ° C. is the Rc, Condensation occurred in the Rd region, but no condensation occurred in the Rb region.
- the Ra area on the inner surface of the cover 11 shown in FIG. 9 is located immediately above the conveyance conveyor C that conveys the container PC. When condensed water adheres to this area, the condensed water drops and enters the container PC. Since there is a possibility, condensation is not preferable.
- the region of Rb on the inner surface of the cover 11 is located in the curved portion directly above the steam discharge unit 12, and the condensed water adhering to this region flows down along the curved inner surface of the cover 11 or drops into the container PC. Although it does not enter, it is preferable that condensation does not occur in order to eliminate the risk of dripping into the container PC.
- the region of Rc on the inner surface of the cover 11 is located above the mouth of the container PC in the curved portion outside the steam discharge unit 12, and the condensed water adhering to this region flows down along the curved inner surface of the cover 11. Therefore, it does not enter the container PC.
- the region of Rd on the inner surface of the cover 11 is located below the mouth of the container PC in the vertical portion outside the steam discharge unit 12, and the condensed water adhering to this region travels along the vertical inner surface of the cover 11. Because it flows down, it does not enter the container PC. For this reason, the condensation in the region of Rc and Rd is not a problem.
- the supply of the container PC can be started after 8 minutes or more, for example, about 8 to 12 minutes, preferably 10 minutes after the temperature in the cover reaches 160 ° C. or more, for example, about 160 to 180 ° C. desirable.
- the temperature inside the cover is stable for 10 minutes since the temperature in the cover reached 160 ° C., so the temperature change in the cover due to the superheated steam is stable. It can be considered almost the same.
- a steam discharge unit that discharges superheated steam is provided in the cover, and the cylindrical label that is fitted in the container that passes through the cover is heated by the superheated steam so that the cylindrical label is thermally contracted.
- the shrinkage device as a dew condensation suppression structure that suppresses the occurrence of dew condensation in the cover, in order to uniformize heat transfer and dew condensation, it is possible to make the cover shape configured with a smooth surface without sudden shape change The temperature distribution inside the cover is made uniform, and even if condensation occurs, the state of condensation occurrence is made uniform. It is suppressed.
- the cover has a cross-sectional shape in a direction orthogonal to the container transport direction and a shape in which the upper part is curved in a semicircular arc shape, and the cross-sectional shape in the container transport direction is set to the upstream and downstream ends in the container transport direction.
- the container in order to prevent the condensed water from entering the container passing through the cover, the container is supplied into the cover after 10 minutes from the time when the temperature in the cover reaches 160 ° C.
- the present invention is not limited to this, and dew condensation is formed on the inner surface of the cover immediately above the container conveyance path or on the vapor discharge units disposed on both sides of the container conveyance path.
- the temperature in the cover and the elapsed time that serve as a guide for the timing of starting the supply of the container into the cover may be appropriately set so as not to occur.
- fin tube type heat air generating heat exchangers 15 are incorporated on both sides in the width direction of the conveyor C, and a plurality of air blowing openings 14a for discharging heated air at a predetermined temperature are formed.
- the heated air blowing unit 14, the steam header 16 connected to the tube of the heated air generating heat exchanger 15, and the air in the container PC are blown into the container PC through the upper opening of the container PC, so that the water vapor inside the container PC is reduced.
- An air nozzle 17 for discharging is disposed, and the air introduced into the heated air blowing unit 14 passes through the heated air generating heat exchanger 15 so that heated air of a predetermined temperature is generated from the air blowing opening 14a. It is blown out toward the periphery of the container PC.
- the transport conveyor C includes a transport belt db on which a container PC on which a cylindrical label L is fitted is placed and a plurality of suction holes h are formed at a predetermined pitch in the transport direction.
- a suction box 18 having an open upper surface is disposed immediately below the transport belt db and is connected to a container holding blower 29 described later. Accordingly, the container PC placed on the transport belt db is sucked and held on the transport belt db at the suction hole h, and does not easily fall over.
- the equipment stacking unit 3 includes a steam pipe 21 that supplies steam generated by the steam boiler 20, and the steam supplied by the steam pipe 21 is heated to overheat about 160 to 180 ° C.
- Superheater 22 that generates water vapor
- pressure sensor 23 that detects the vapor supply pressure of water vapor supplied by the steam pipe 21, and pressure sensor 23 that detects a predetermined flow rate of water vapor to supply the super heater 22.
- An electric valve 24 that opens and closes the steam supply path according to the steam supply pressure, a pressure adjustment valve 25 that adjusts the supply pressure of steam to the steam header 16, and air for generating heated air is supplied to the heated air blowing unit 14.
- a condensing heat exchanger 31 for condensing water vapor is provided.
- the residual heat unit 27 includes a chamber 27a installed in the lower part on the back side and extending in the transport direction of the container PC, and four copper tubes through which air for generating heated air passing through the chamber 27a in the transport direction of the container PC is passed.
- the surplus steam in the heat shrink zone ZA supplied by the exhaust blower 30 passes through the chamber 27a and is supplied to the condensing heat exchanger 31 disposed on the upper portion of the residual heat unit 27. It has become so. Accordingly, the air for generating the heated air exchanges heat with the excess water vapor in the chamber 27a when passing through the copper tube 27b, and is supplied to the heated air blowing unit 14 in a preheated state.
- the heat exchanger 31 for condensation is composed of a fin tube type heat exchanger main body 31a and a casing 31b that accommodates the heat exchanger main body 31a, and clean water is supplied to the tube of the heat exchanger main body 31a.
- surplus water vapor that has passed through the chamber 27a of the preheating unit 27 is supplied into the casing 31b. Accordingly, the surplus steam supplied into the casing 31b is condensed by exchanging heat with the clean water passing through the tube of the heat exchanger main body 31a, and discharged as drain water from a drain outlet attached to the lower part of the casing 31b. It has come to be.
- the cylindrical label L fitted on the body portion of the container PC is heated by superheated steam at about 160 to 180 ° C. supplied to the heat shrinking zone ZA of the heat treatment chamber 2. Since the heat shrinks, the design and characters printed on the shrink label are not easily distorted and can be finished neatly as in the case of heating with water vapor.
- the air nozzle 17 blows air into the container PC from the upper opening of the container PC, so that the inside of the container PC.
- the heated air blowing unit 14 blows the heated air at a predetermined temperature, so that even if a small amount of water droplets adhere to the outer surface of the container PC or the cylindrical label L, the water droplets are evaporated. Therefore, the container PC on which the cylindrical label L is mounted can be delivered to the liquid beverage filling step in a state where no water droplets are attached to the surface of the container PC or the cylindrical label L or the inner surface of the container PC.
- the thickness of the cover in the heat treatment chamber was changed from 1.2 mm to 1.5 mm, the shape was a dome shape, and the upper half was curved in a semicircular arc shape in the direction perpendicular to the container transport direction.
- the cross-sectional shape in the container transport direction was changed to one in which the upper end corners at the upstream and downstream ends in the container transport direction are curved in an arc shape.
- a steam discharge nozzle in the steam discharge unit for superheated steam is disposed on the upstream side in the cover to discharge superheated steam upward, and supply the superheated steam to the upstream side in the container transport direction in the steam discharge unit. It was changed as follows.
- condensation that may drop from the cover onto the container can be prevented. Furthermore, by starting to supply the container into the cover after 10 minutes from the time when the temperature in the cover reaches 160 ° C., it is possible to further suppress the occurrence of condensation that may drip into the container on the downstream side in the cover. be able to. Moreover, in this heat contraction apparatus 1, since the preheating unit 27 preheats the air for heating air generation using the surplus water vapor
- This heating shrinkage device 1 is used to preheat the air for generating heated air. Since the surplus water vapor after cooling is cooled and condensed by passing through the heat exchanger 31 for condensation, it can be discharged as drain water, and when surplus water vapor is discharged outside as it is Compared to this, there is an advantage that an image of the surroundings is good and an exhaust duct or the like for discharging excess water vapor is not necessary.
- the drain water obtained by condensing excess water vapor is 70 to 80 ° C.
- the cooling water supplied to the condensation heat exchanger 31 is heated to about 50 ° C. by exchanging heat with the excess water vapor.
- the supply temperature of the superheated steam supplied into the heat treatment chamber 2 is 100 ° C., which is a heat shrink temperature for causing heat shrinkage to the limit shrinkage rate of the shrink label forming the cylindrical label L. If the temperature is set to a temperature that greatly exceeds the vicinity, for example, about 160 ° C. to 180 ° C., the cylindrical label L fitted on the container PC enters the heat treatment chamber 2 and quickly heats up to the necessary shrinkage rate.
- the heat shrinkage zone in the heat treatment chamber 2 can be extremely shortened as compared with the case where heating is performed with heated air of the same temperature or the case of heating with water vapor.
- the length of ZA can be shortened, the space of the entire apparatus can be saved, and the amount of steam supply can be reduced compared to the case of heating with steam. There is an advantage in that that.
- the air nozzle 17 discharges water vapor inside the container PC by blowing air into the container PC.
- the present invention is not limited to this.
- the air nozzle 17 can be omitted.
- the present invention can be used when a shrink label, a packaging material or the like covering a part or the whole of an article is heated and shrunk.
- Pressure regulating valve 26 ... Drying blower 27 ... Preheating unit (preheating device) 27a ... Chamber 27b ... Copper tube 28 ... Filter unit 29 ... Container holding blower 30 ... Exhaust blower 31 ... Condensation heat exchanger (vapor condensing device) 31a ... Heat exchanger body 31b ... Casing C ... Conveyor L ... Cylindrical label db ... Conveyor belt h ... Suction hole PC ... Plastic container ZA ... Heat shrinkage Zone ZB ... Drying zone
Abstract
Description
1)供給温度が100℃以下である水蒸気とは異なり、供給温度を100℃を上回る温度領域で自由に設定することができる
2)加熱空気に比べて熱容量が大きいので、同一温度の加熱空気によって加熱する場合に比べて、被加熱物を急速に加熱することができる
3)加熱空気の場合は対流によって熱伝達されるだけであるが、過熱水蒸気の場合は対流、放射及び凝縮によって複合的に熱伝達され、しかも、対流による熱伝達も、加熱空気の10倍以上であるので、加熱空気に比べて、加熱効率が格段に優れているという特性を有しているので、加熱処理室内に供給する過熱水蒸気の供給温度を、各種シュリンクラベルをそれぞれの限界収縮率まで熱収縮させるための熱収縮温度である100℃付近を大きく上回る温度、例えば、160℃~180℃程度に設定しておくと、加熱処理室内に進入した物品を覆っているシュリンクラベルが瞬時に限界収縮率まで熱収縮を起こすことになり、同一温度の加熱空気によって加熱する場合や水蒸気によって加熱する場合に比べて、加熱処理室内の通過時間を極端に短縮することができる。従って、加熱処理室の長さを短くすることができ、加熱収縮装置の省スペース化を図ることが可能になる。また、水蒸気によって加熱する場合に比べて蒸気供給量を少なくすることができる。
また、容器PCの搬送方向に直交する方向(幅方向)の断面形状については、搬送する容器PCよりも上側の部分を全体的に円弧状に湾曲させておくことが望ましい。具体的には、図9に示すように、カバー11の頂部から下方側にカバー11の高さHの50~80%程度の領域(高さ方向の領域)R3を円弧状に形成しておくことが望ましく、曲率半径が170mm程度の円弧状に湾曲させておくことがより望ましい。
上述の実験により、カバー内温度が160℃以上、例えば160~180℃程度に到達した時点から8分以上、例えば8~12分程度、好ましくは10分経過後に容器PCの供給を開始することが望ましい。なお、実験番号Bでは、カバー内温度を160℃に到達した時点から10分以上経過させているので、過熱水蒸気によるカバー内の温度変化は安定しており、カバー内温度と過熱水蒸気の温度はほぼ同じと考えることができる。
また、この加熱収縮装置1では、余熱ユニット27が加熱処理室2における熱収縮ゾーンZA内の余剰水蒸気を利用して加熱空気生成用の空気を予熱するようになっているので、容器PCや筒状ラベルLに付着した僅かな水滴を蒸発させるために容器PCや筒状ラベルLに吹き付ける所定温度の加熱空気を効率よく生成することができ、エネルギー効率も良い。
2・・・加熱処理室
2a・・・扉
3・・・機器集積部
4・・・制御盤
11・・・カバー
12・・・蒸気吐出ユニット(蒸気供給装置)
12a・・・吐出孔
13・・・蒸気吐出ノズル
14・・・加熱空気吹出ユニット(加熱空気吹付装置)
14a・・・空気吹出開口
15・・・加熱空気生成用熱交換器(加熱装置)
16・・・蒸気ヘッダ
17・・・エアノズル
18・・・吸引ボックス
20・・・蒸気ボイラ(蒸気供給装置)
21・・・蒸気配管(蒸気供給装置)
22・・・スーパーヒータ(蒸気供給装置)
23・・・圧力センサ(蒸気供給装置)
24・・・電動バルブ(蒸気供給装置)
25・・・圧力調整弁
26・・・乾燥用ブロア
27・・・予熱ユニット(予熱装置)
27a・・・チャンバー
27b・・・銅管
28・・・フィルターユニット
29・・・容器保持用ブロア
30・・・排気用ブロア
31・・・凝縮用熱交換器(蒸気凝縮装置)
31a・・・熱交換器本体
31b・・・ケーシング
C・・・搬送コンベア
L・・・筒状ラベル
db・・・搬送ベルト
h・・・吸引孔
PC・・・プラスチック容器
ZA・・・熱収縮ゾーン
ZB・・・乾燥ゾーン
Claims (2)
- 物品の一部または全部がシュリンクラベルによって覆われたラベル被覆体の搬送路を囲う加熱処理室と、
加熱処理室内に過熱水蒸気を供給することで、加熱処理室内を通過するラベル被覆体のシュリンクラベルを熱収縮させる蒸気供給装置と、
所定温度の加熱空気を生成する加熱空気生成装置と、
過熱水蒸気が供給された加熱処理室内を通過することで水滴が付着したラベル被覆体に、加熱空気生成装置によって生成された加熱空気を吹き付けることで、水滴を蒸発させる加熱空気吹付装置とを備え、
加熱空気生成装置は、
加熱処理室内の余剰水蒸気を利用して空気を予熱する予熱装置と、
予熱装置によって予熱された空気を所定温度まで加熱する加熱装置とを有していることを特徴とするシュリンクラベルの加熱収縮装置。 - 加熱処理室内の余剰水蒸気を冷却して凝縮させる蒸気凝縮装置を備えている請求項1に記載のシュリンクラベルの加熱収縮装置。
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KR1020177002077A KR102341905B1 (ko) | 2014-06-27 | 2015-06-26 | 쉬링크 라벨의 가열수축장치 |
US15/317,263 US11273941B2 (en) | 2014-06-27 | 2015-06-26 | Heat-shrinking apparatus for shrink labels |
EP15811117.9A EP3162720B1 (en) | 2014-06-27 | 2015-06-26 | Heat-shrinking apparatus for shrink labels |
JP2016529677A JP6412937B2 (ja) | 2014-06-27 | 2015-06-26 | シュリンクラベルの加熱収縮装置 |
CN201580034456.2A CN106573692B (zh) | 2014-06-27 | 2015-06-26 | 收缩标签的加热收缩装置 |
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EP (1) | EP3162720B1 (ja) |
JP (1) | JP6412937B2 (ja) |
KR (1) | KR102341905B1 (ja) |
CN (1) | CN106573692B (ja) |
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WO (1) | WO2015199221A1 (ja) |
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US20170129634A1 (en) | 2017-05-11 |
US11273941B2 (en) | 2022-03-15 |
TWI655136B (zh) | 2019-04-01 |
CN106573692A (zh) | 2017-04-19 |
JP6412937B2 (ja) | 2018-10-24 |
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TW201600404A (zh) | 2016-01-01 |
EP3162720B1 (en) | 2018-10-03 |
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CN106573692B (zh) | 2019-07-16 |
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