JP2011005390A - Solvent vapor evacuation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solvent vapor evacuation system which is applicable to a coating device for applying a coating material containing a volatile solvent and so designed as to increase the efficiency of an exhaust gas combustion device under the system by efficiently recovering the volatilized solvent and further, can ameliorate peripheral environments.SOLUTION: This solvent vapor evacuation system comprises a coating part which applies by a roll a coating material containing the volatile solvent to a continuous length base material, a conveyance part which conveys the continuous length base material coated by the coating part, a coating device equipped with an oven for drying the continuous length base material conveyed by the conveyance part, a suction duct which sucks the volatile component of the volatile solvent in the coating part, a partitioning wall part surrounding the area at least from the coating part to an oven entrance, and an exhaust duct which is connected with the oven and has the suction duct connected with the exhaust duct. In addition, the volatile component of the volatile solvent in the coating part and the conveyance part is allowed to flow into the exhaust duct by the convection of air inside the partitioning wall part through the suction duct or directly.

Description

  The present invention relates to a solvent exhaust system.

  The pouch is manufactured, for example, in the order of a gravure printing process, a laminating process, a slitting process, and a bag making process. Among these, in the laminating step, an adhesive is applied to the printing surface side of the gravure-printed original film and dried by heating (Patent Documents 1 and 2).

  Application | coating of the adhesive agent to a raw fabric film is performed by transferring the adhesive agent accommodated in the storage container to a raw fabric film using a roll. The adhesive used here is a two-component mixed type of a main agent and a curing agent, and the viscosity is adjusted with a solvent.

JP-A-8-224828 JP 2009-51011 A

  In the above-described conventional laminating process, the main agent and the curing agent dissolved in the volatile solvent are once stored in a storage container from a tank, and then applied to a wide and long film through an application roll. At this time, the solvent is volatilized and diffused, resulting in an unfavorable surrounding environment for the operator who confirms the coating state, and the exhausted vent to the outside of the factory because the volatilized solvent cannot be sufficiently collected. There has been a problem that the solvent concentration in the exhaust gas supplied to the exhaust gas combustion apparatus installed in the front is lowered, and the combustion efficiency is lowered.

Volatilization of the solvent of the adhesive occurs from two locations: the liquid surface of the adhesive in the container and the surface of the adhesive applied to the film.
When a substance heavier than air, such as ethyl acetate, MEK (methyl ethyl ketone), or the like, is used as the main component of the solvent for the adhesive, the solvent volatilized from the container flows downward due to its own weight. For this reason, it was necessary to open the periphery of the laminating equipment in order to prevent the stagnation of the solvent.

  In addition, in the exhaust gas combustion device, it is necessary to maintain the exhaust gas at a high temperature in order to burn the solvent in the exhaust gas. However, when processing the solvent diffused in the air, a larger amount of air is recovered. In order to maintain a large amount of air at a high temperature, it is necessary to use more combustion gas. If the solvent from the adhesive can be recovered at a high concentration, not only the amount of treated air in the exhaust gas combustion device will be reduced, but also the combustion heat of the contained solvent can be used for maintaining the high temperature, which has the advantage of further increasing the combustion efficiency. is there.

  Accordingly, the present invention provides a coating apparatus for applying a coating agent containing a volatile solvent, which can efficiently recover the volatilized solvent to increase the efficiency of the exhaust gas combustion apparatus and improve the surrounding environment. An object is to provide an exhaust system.

  In order to solve the above-described problems, the solvent exhaust system of the present invention is a coating unit that applies a coating agent containing a volatile solvent to a long base material by a roll, and a long coating applied at the coating unit. A transport unit that transports the long base material, a coating device that includes an oven that dries the long base material transported by the transport unit, a suction duct that sucks volatile components of the volatile solvent in the coating unit, and at least A partition wall that surrounds from the coating unit to the entrance of the oven, and an exhaust duct that is connected to the oven and connected to the suction duct. The coating unit and the transport unit are provided by air convection in the partition wall. The volatile component of the volatile solvent in is flowed through the suction duct or directly into the exhaust duct.

  In the solvent exhaust system of the present invention, it is preferable that the suction duct has a suction portion that is provided below the storage container that stores the coating agent and can suck the gas around the storage container.

  The solvent exhaust system of this invention WHEREIN: It is preferable that a partition wall part is provided with the ventilation part which introduces external air.

  In the solvent exhaust system of the present invention, the air blowing unit blows air to any of the long base materials on the surface side where the coating agent is applied at the coating portion and above the container and up to the oven entrance. It is preferable to provide an air blowing port.

  In the solvent exhaust system of the present invention, it is preferable that the blower blows air in a direction toward the coating position by the coating part.

  In the solvent exhaust system of the present invention, it is preferable that an opening is provided in the lower part of the partition wall.

  In the solvent exhaust system of the present invention, the long base material is preferably a plastic film.

  According to the present invention, in a coating apparatus for applying a coating agent containing a volatile solvent, the solvent that can efficiently recover the volatilized solvent to increase the efficiency of the exhaust gas combustion apparatus and improve the surrounding environment. An exhaust system can be provided.

It is a longitudinal cross-sectional view which shows the internal structure of the solvent exhaust system which concerns on embodiment of this invention. It is a top view which shows the internal structure of the solvent exhaust system which concerns on embodiment of this invention.

Hereinafter, a solvent exhaust system according to an embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing an internal configuration of the solvent exhaust system according to the present embodiment, and is a view of a conveyance path from the coating apparatus to the oven 23 as viewed from the side. FIG. 2 is a plan view showing an internal configuration of the solvent exhaust system according to the present embodiment, and is a view showing the partition wall 40 with the upper wall removed.

  The present embodiment is an example in which the present invention is applied to supply of an adhesive in a laminating process, and the coating agent S accommodated in the container 24 is a two-component mixture whose viscosity is adjusted with a solvent (for example, ethyl acetate, MEK). Mold adhesive. On the other hand, this invention is not limited to this embodiment, It is applicable also to supply of adhesive agents other than a 2 liquid mixing type, and coating agents other than an adhesive agent.

  The solvent exhaust system 10 of the present embodiment includes a coating device including a coating unit 21, a transport unit 22, and an oven 23, a suction duct 30, a partition wall 40, and an exhaust duct 50.

  The coating unit 21 applies the coating agent S containing a volatile solvent to the base material M (long base material) that is long in the transport direction by the application roll 21a. Although the base material M can be selected arbitrarily according to the purpose of coating, etc., it is preferably a plastic film for the laminating process.

  The transport unit 22 includes transport rolls 22a, 22b, and 22c, and transports the base material M to the coating unit 21 side, and also transports the base material M coated with the coating agent S to the oven 23 side. Transport.

  Here, a part of the outer peripheral surface of the coating roll 21a is immersed in the coating agent S filled in the container 24, and when the coating roll 21a is rotated, the coating agent S in the container 24 is coated. It is applied on the outer periphery of the roll 21a. The coating roll 21a is in opposed contact with the substrate M (raw film) transported by the transport unit 22, and rotates the coating roll 21a and the transport rolls 22a, 22b, and 22c of the transport unit 22 synchronously. As a result, the coating agent S is transferred onto the substrate M.

  A suction duct 30 is disposed below the storage container 24. The suction duct 30 sucks the gas around the container 24, particularly the volatile component of the coating agent S around the coating part 21, by the suction part 31 arranged so as to surround the side from the lower side of the container 24.

  The base material M coated with the coating agent S by the coating unit 21 and transported by the transport unit 22 is dried at a high temperature in the oven 23. The base material M enters the oven 23 through the inlet 23a and is heated while being conveyed by a feed roll 23b provided inside.

  Connected to the oven 23 is an exhaust duct 50 for discharging the gas in the oven 23 to the outside through an exhaust gas combustion device. It is preferable to provide a plurality of exhaust ducts 50 at regular intervals in the conveyance direction of the base material M. Thereby, the volatile component of the coating agent S volatilized in the oven 23 can be reliably discharged.

  In addition, one end of an exhaust pipe 51 is connected to the exhaust duct 50. The other end of the exhaust pipe 51 is connected to the suction duct 30, and the gas sucked into the suction duct 30 is sent to the exhaust duct 50 through the exhaust pipe 51, and is sent from the exhaust duct 50 to the exhaust gas combustion apparatus. Can be discharged.

  A space in which the base material M is conveyed from the coating unit 21, the suction duct 30, and the inlet 23 a of the oven 23 to the coating unit 21 is surrounded by a partition wall 40. This partition wall part 40 is comprised with the material which has the tolerance with respect to the volatile component from the coating agent S, and can suppress passage of a volatile component. The base material M is introduced into the partition wall 40 from an opening provided in the wall surface on the transport roll 22a side of the partition wall 40.

  The partition wall 40 is provided with a blower 41 that introduces outside air into the space formed by the partition wall 40. The blower unit 41 has a hollow columnar structure provided at a position facing the base material M conveyed between the coating unit 21 and the oven 23, and is connected to a blower 60 provided outside the partition wall 40. ing. The blower 60 supplies air outside the partition wall 40 or outside the factory as a predetermined cleanness through the filter to the blower 41 with a constant pressure. In the air blowing part 41, the air supplied from the blower 60 is introduced into the partition wall part 40 from the air blowing port 42. The outside air discharged from the blower opening 42 is sent to a region of the base material M on the surface side where the coating agent S is applied by the coating unit 21 and above the container 24 and up to the inlet 23 a of the oven 23. It is desirable. Here, the amount or pressure of the outside air blown from the blowing port 42 is set so that the base material M conveyed from the coating unit 21 to the oven 23 does not flutter.

  In addition, an opening 44 penetrating the partition wall 40 is provided in the lower part of the partition wall 40. The opening 44 itself does not actively introduce outside air into the partition wall 40, and can be released to the outside when the solvent remains in the partition wall 40, thereby ensuring safety. Can be improved. In addition, external air can be introduced through the opening 44 as the suction duct 30 and the exhaust duct 50 are sucked.

  In addition, the range which provides a partition wall part is not limited to this embodiment, What is necessary is just to surround from the coating part 21 to the inlet 23a of the oven 23 at least.

  According to the above configuration, the volatile component of the volatile solvent of the coating agent S in the coating unit 21 and the transport unit 22 is directly or directly via the suction duct 30 due to air convection in the partition wall 40. , Flows into the exhaust duct 50. That is, the gas around the coating unit 21 and the conveyance unit 22 is sucked by the suction duct 30 and travels to the exhaust duct 50 through the exhaust pipe 51, and the route sucked from the inlet 23 a of the oven 23 to the exhaust duct 50. Then, it is discharged to the outside through the exhaust gas combustion device. Accordingly, the volatilized solvent can be efficiently recovered, and the surrounding environment of the coating unit 21 and the transport unit 22 can be maintained. Furthermore, since the volatilized solvent can be efficiently recovered, excessive volatile components do not remain in the oven 23, and the load on the exhaust gas combustion apparatus can be suppressed.

  Moreover, when the volatile component of the solvent used for the coating agent S is heavier than air, the suction duct 30 can be reliably suctioned by being provided below the coating part 21. Further, even if the suction duct 30 and the exhaust duct 50 are not completely sucked and a volatile component remains in the vicinity of the floor surface in the partition wall 40, the inside of the partition wall 40 caused by the suction of the suction duct 30 and the exhaust duct 50 may be It becomes possible to suck in the suction duct 30 in accordance with the convection.

  The amount of exhaust by the suction duct 30 and the exhaust duct 50 is preferably the same as or slightly larger than the sum of the amount of air blown by the air outlet 42 and the amount of solvent volatilized in the oven 23. If the exhaust amount by the suction duct 30 and the exhaust duct 50 is too small, the volatile component of the solvent remains in the partition wall 40 or in the oven 23. Degradation and other problems may occur.

  Moreover, if it is set as the above structures, when using the carbon dioxide fire extinguisher at the time of a fire, oxygen interruption | blocking can be performed rapidly and fire extinguishing efficiency improves.

  Although the present invention has been described with reference to the above embodiment, the present invention is not limited to the above embodiment, and can be improved or changed within the scope of the purpose of the improvement or the idea of the present invention.

  As described above, the solvent exhaust system according to the present invention is particularly suitable for the laminating process in pouch manufacturing.

DESCRIPTION OF SYMBOLS 10 Solvent exhaust system 21 Coating part 21a Application | coating roll 22 Conveyance part 22a, 22b, 22c Conveyance roll 23 Oven 23a Inlet 23b Feeding roll 24 Storage container 30 Suction duct 31 Suction part 40 Partition wall part 41 Blower part 42 Blower port 44 Opening 50 Exhaust duct 51 Exhaust pipe 60 Blower S Coating agent M Base material (long base material)

Claims (7)

The coating part which coats the coating agent containing a volatile solvent with respect to a long base material with a roll, the conveyance part which conveys the long base material coated with the coating part, and the conveyance part A coating apparatus comprising an oven for drying the long base material conveyed in
A suction duct for sucking a volatile component of the volatile solvent in the coating part;
A partition wall that surrounds at least from the coating part to the entrance of the oven;
An exhaust duct connected to the oven and connected to the suction duct;
With
The volatile component of the volatile solvent in the coating unit and the transport unit is caused to flow into the exhaust duct through the suction duct or directly by convection of air in the partition wall. Solvent exhaust system.   2. The solvent exhaust system according to claim 1, wherein the suction duct is provided below a storage container that stores the coating agent, and has a suction unit that can suck gas around the storage container.   The solvent exhaust system according to claim 1, wherein the partition wall includes a blower that introduces outside air.   The air blower blows air to any one of the long base material on the surface side where the coating agent is coated by the coating portion and above the container and up to the entrance of the oven. The solvent exhaust system according to claim 3, further comprising a mouth.   The solvent exhaust system according to claim 3 or 4, wherein the blower blows air in a direction toward a coating position by the coating unit.   The solvent exhaust system according to any one of claims 1 to 5, wherein an opening is provided in a lower portion of the partition wall portion.   The solvent exhaust system according to any one of claims 1 to 6, wherein the long base material is a plastic film.

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