JP7300233B1 - Decolorization device, decolorization method - Google Patents

Abstract

A decolorizing agent for decolorizing a dyed or printed fabric is recovered and reusable. There is provided an absorption treatment means for impregnating a dyed or printed fiber cloth with a decolorizing agent, and an absorber that heats and presses the fiber cloth to absorb the decolorizing agent permeated into the fiber cloth together with the dye dyed or printed on the fiber cloth. a collecting means for collecting a part of the decolorizing agent that has permeated the fiber cloth; a decolorizing agent recycling means for re-soaking the decolorizing agent collected by the collecting means with an absorption treatment means; an absorbent body regenerating means for washing the absorbent body in a washing liquid and making it available as an absorbent body for moving the decolorizing agent again by the moving means. [Selection drawing] Fig. 12

Description

TECHNICAL FIELD The present invention relates to a bleaching apparatus and bleaching method, and more particularly to a bleaching apparatus and bleaching method for bleaching a dyed or printed fabric.

A method for producing a printed material comprising a step 1 of printing a fabric with a dye printing agent, a step 2 of decolorizing a portion of the fabric printed in the step 1, and a step 3 of printing with a pigment printing agent, A method for producing a printed matter using a pigment printing agent containing a disazo pigment as a pigment printing agent is known (Patent Document 1).

In a discharge printing machine for discharging an object to be discharged, such as a fiber cloth, there is provided a heat press device for heating and pressurizing the object to be discharged, and the object to be discharged is placed on the upper surface of the heat press, which is arranged below the heat press. It has an article-to-be-discharged mounting table forming a mounting surface, a water storage tank arranged below the article-to-be-discharged mounting table for containing water, and a heater for heating the water in the water storage tank. and a steam generating device for steaming the object to be discharged using the steam generated from the water storage tank. There is also known a discharge printing machine that applies heat and pressure to an object to be discharged from above and, at the same time, applies steam treatment to an object to be discharged from below using a steam generator (Patent Document 2). ).

JP 2016-11464 A JP 2006-176889 A

The present invention makes it possible to recover and reuse a decolorizing agent for decolorizing dyed or printed fabric.

In order to solve the above problems, the decolorization device according to claim 1,
Absorption treatment means for immersing a dyed or printed fiber cloth in a decolorizing agent to impregnate the fiber cloth with the decolorizing agent;
squeezing means for adjusting the amount of the decolorizing agent soaked into the fiber cloth to a predetermined amount;
moving means for heating and pressurizing the fiber cloth to move the decolorizing agent permeated into the fiber cloth to an absorbent body together with the dye dyed or printed on the fiber cloth;
recovery means for recovering a part of the decolorizing agent soaked into the fiber cloth,
It is characterized by

The invention according to claim 2 is the decolorization device according to claim 1,
The transfer means heats the fiber cloth via the absorbent body to transfer the decolorizing agent to the absorbent body together with the dye dyed or printed on the fiber cloth.
It is characterized by

The invention according to claim 3 is the decolorization device according to claim 2 ,
The moving means contact-heats the absorbent at a temperature below the boiling point of the decolorant.
It is characterized by

The invention according to claim 4 is the decolorization device according to claim 1,
The absorber is replaceable according to the required absorption amount of the permeated decolorizing agent,
It is characterized by

The invention according to claim 5 is the decolorization device according to claim 1,
The collecting means collects the decolorizing agent that has not been absorbed by the fiber cloth from the permeated decolorizing agent.
It is characterized by

The invention according to claim 6 is the decolorization device according to claim 1,
The recovery means recovers steam generated from the decolorizing agent when heated by the moving means.
It is characterized by

The invention according to claim 7 is the decolorization device according to claim 1,
The collecting means extracts the decolorizing agent from the absorber to which the decolorizing agent has moved and collects it as a liquid.
It is characterized by

The invention according to claim 8 is the decolorization device according to claim 1,
The collecting means heats the decolorized fiber cloth to collect the decolorizing agent.
It is characterized by

The invention according to claim 9 is the decolorization device according to claim 1,
a decolorizing agent recycling means for re-impregnating the decolorizing agent collected by the collecting means with the absorption processing means;
It is characterized by

The invention according to claim 10 is the decolorization device according to claim 1,
It further comprises an absorber regeneration means for washing the absorber to which the decolorizing agent has been transferred with a washing liquid so that it can be used as the absorber for moving the decolorizing agent again by the transfer means.
It is characterized by

The invention according to claim 11 is the decolorization device according to claim 10 ,
extracting and recovering the dye that has migrated from the fiber cloth from the washing liquid;
It is characterized by

In order to solve the above problems, the decolorization method according to claim 1 or 2 ,
an absorption treatment step of soaking the dyed or printed fiber cloth in the decolorizing agent to impregnate the fiber cloth with the decolorizing agent;
an adjusting step of adjusting the amount of the decolorizing agent soaked into the fiber cloth to a predetermined amount;
a transfer step of heating and pressurizing the fiber cloth to transfer the decolorizing agent permeated into the fiber cloth to the absorber together with the dye dyed or printed on the fiber cloth;
a recovery step of recovering a portion of the decolorizing agent soaked into the fiber cloth;
Using the decolorization device according to any one of claims 1 to 11 as the decolorization device,
It is characterized by

The invention according to claim 1-3 is the decolorization method according to claim 1-2 ,
Further comprising a regeneration step of washing the absorber to which the decolorizing agent has migrated with a washing liquid so that it can be used as a new absorber.
It is characterized by

According to the inventions of claims 1, 1 and 2 , the decolorizing agent for decolorizing the dyed or printed fiber cloth can be recovered and reused.

According to the invention of claim 2 , the decolorization performance of the fiber cloth can be improved.

According to the third aspect of the present invention, it is possible to promote the movement of the decolorant to the absorbent body while suppressing heat damage to the fiber cloth.

According to the fourth aspect of the invention, it is possible to optimize the amount of decolorizing agent used and the heating temperature and heating time of the fiber cloth.

According to the fifth aspect of the invention, it is possible to suppress the outflow of the decolorant to the surrounding environment.

According to the sixth aspect of the invention, it is possible to recover the vapor generated when the decolorizing agent is contact-heated, thereby suppressing the outflow of the decolorizing agent to the surrounding environment.

According to the seventh aspect of the present invention, it is possible to prevent the outflow of the decolorizing agent to the surrounding environment by recovering the vapor generated by heating the absorber to which the decolorizing agent has migrated.

According to the eighth aspect of the invention, it is possible to recover the decolorizing agent remaining on the decolorized fiber cloth and suppress the outflow of the decolorizing agent to the surrounding environment.

According to the ninth aspect of the invention, the amount of decolorizing agent used can be reduced by reusing the decolorizing agent.

According to the inventions of Claims 10 and 13 , the absorber can be reused to reduce the amount of absorber used.

According to the invention of claim 11 , the dye decolorized from the fiber cloth can be reused.

It is a block diagram showing an example of the hardware constitutions of the bleaching device concerning this embodiment. It is a figure explaining the decolorization process to one surface of a fiber cloth. It is a figure which shows the structural example of an absorption process part. FIG. 10 is a diagram showing a configuration example of an absorption processing unit of modification 1 using a dipping method; It is a figure which shows the structural example of the absorption process part of the modification 2 by a roller system. It is a figure which shows the structural example of a narrowing process part. It is a figure which shows the structural example of a heat processing part. FIG. 4 is a schematic diagram illustrating movement of a decolorant from a fiber cloth to an absorbent body in a heat treatment section; FIG. 10 is a diagram illustrating a configuration example of a recovery unit that recovers part of the decolorizing agent soaked into the fiber cloth; FIG. 10 is a diagram illustrating a configuration example of a recovery unit that vacuum-extracts the decolorizing agent from the absorber to which the decolorizing agent has moved and recovers the decolorizing agent as a liquid. It is a figure explaining the structural example of a reproduction|regeneration process part. It is a flowchart figure which shows the flow of the decoloring process of the decoloring method which concerns on this embodiment.

Next, specific examples of embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to the following embodiments.
It should be noted that in the following description using the drawings, the drawings are schematic, and the ratio of each dimension is different from the actual one. Illustrations other than members are omitted as appropriate.

(1) Configuration of Decolorization Apparatus FIG. 1 is a block diagram showing an example of the hardware configuration of a decolorization apparatus 1 according to this embodiment, and FIG.
Hereinafter, the configuration of the decolorization device 1 according to this embodiment will be described with reference to the drawings.

As shown in FIG. 1, the decolorizing apparatus 1 according to the present embodiment includes an absorption processing unit 10 as an example of an absorption processing means for impregnating a dyed or printed fiber cloth T with a decolorizing agent, and an absorption processing unit 10. A squeezing unit 20 as a squeezing means for squeezing a predetermined amount of decolorizing agent from the treated fiber cloth T, and dyeing the fiber cloth T with the decolorizing agent permeated into the fiber cloth T by heating and pressurizing the fiber cloth T. Alternatively, a heat processing section 30 as an example of a transfer means for moving the dye together with the printed dye to the absorber F, a recovery section 40 as an example of a recovery means for recovering a part of the decolorant that has soaked into the fiber cloth T, and decolorization. A regeneration processing unit 50, an absorption processing unit 10, a drawing processing unit 20, and a heat treatment as an example of an absorber regeneration unit that cleans the absorber F to which the agent has moved in a cleaning liquid and makes it available as a new absorber F. A control unit 60 that controls the entire decolorization apparatus 1 including the operations of the unit 30, the collection unit 40, and the regeneration processing unit 50.

In this embodiment, as shown in FIG. 2(a), in the absorption processing section 10 of the decoloring apparatus 1, a decolorizing agent (symbol in FIG. 2(a)) is applied to a part of one surface of the dyed or printed fiber cloth T. D) is impregnated, and a predetermined amount of the decolorizing agent is squeezed from the fiber cloth T in the squeezing section 20, and then, as shown in FIG. By applying heat treatment to heat the dye, the dye is sublimated and transferred to the absorber F to obtain a fabric in which one surface of the original fiber cloth T (indicated by P in FIG. 2(c)) is exposed. A part of the decolorizing agent that has permeated the fiber cloth T is recovered via the recovery unit 40, making it possible to suppress the outflow of the decolorizing agent to the surrounding environment.

(fiber cloth)
The fiber cloth T that can be used in the present embodiment is not particularly limited, and any fiber to be printed or dyed with a disperse dye, such as polyester fiber, acetate fiber, polylactic acid fiber, polyphenylene sulfide fiber, vinylon fiber, polyamide fiber, polypropylene fiber, etc. and fibrous materials made of natural or synthetic fibers. The fiber cloth T may consist of a plurality of types of fibers (mixed spinning, mixed twist, mixed weave, mixed knit, etc.), or may consist of a single type of fiber. Also, the fiber cloth T may be a knitted fabric, a woven fabric, or a non-woven fabric.
According to the decolorization method according to the present embodiment, it is possible to decolor with a higher brightness, particularly in the case of a fiber cloth containing polyester fibers.
The form of the fiber cloth T made of such material may be a single sheet illustrated in FIG. 2, or a continuous body wound into a roll.

(Decolorizing agent)
As the decolorizing agent, any decolorizing agent commonly used for decolorizing dyes can be used without particular limitation. Specifically, reducing agents are commonly used to decolorize or discharge dyes.

A dibasic acid monoester or diester may be used as a decolorizing agent suitable for decolorizing the pattern or the like formed on the original fiber cloth T with higher lightness. diethyl, dimethyl glutarate, diethyl glutarate, dimethyl adipate, diethyl adipate, dimethyl maleate, diethyl maleate and the like.
Also, as a decolorizing agent, for example, ethylene glycol diacetate, di- or triethylene glycol diacetate, ethylene glycol monoacetate, di- or triethylene glycol monoacetate, propylene glycol diacetate, di- or tripropylene glycol diacetate, propylene glycol monoacetate, By using acetate, di- or tripropylene glycol monoacetate, ethylene glycol, propylene glycol, di- or triethylene glycol, di- or tripropylene glycol, etc., the pattern formed on the original fiber cloth T can be reproduced with a higher brightness. Decolorization becomes possible.

The decolorizing agent may further contain other components such as water, wetting agents, surfactants, etc., and is prepared as a liquid in which these decolorizing agents are dispersed at a predetermined concentration.

(Absorption processing part)
FIG. 3 is a diagram showing a configuration example of the absorption processing section 10. As shown in FIG.
As shown in FIG. 3A, the absorption processing section 10 includes a storage tank 11 that stores the decolorizing agent. The storage tank 11 is formed in a box shape with an open top side.
Inside the storage tank 11, a liquid absorption part 12 for sucking up a decolorizing agent (indicated by symbol D) is arranged. The liquid absorbing portion 12 is provided with a plurality of through holes 12a, and is constructed so that the liquid decolorizing agent passes through the through holes 12a, sucking up the decolorizing agent from the through holes 12a (indicated by arrows in FIG. 3). With such a configuration, the decolorant is not excessively sucked up. In FIG. 3, the liquid absorbing part 12 is arranged so as to float from the bottom surface of the storage tank 11, but it may be placed only on the bottom surface of the storage tank 11 so as to be pressed against the bottom surface. It may be fixed.

A decolorizing agent supply tank 13 for supplying the decolorizing agent is connected to the storage tank 11 . The decolorizing agent supply tank 13 is connected to the storage tank 11 by a pipe or the like, and by keeping the liquid level of the decolorizing agent supply tank 13 constant, the liquid level of the decolorizing agent stored in the storage tank 11 can be adjusted to a predetermined level. so that the liquid absorbing portion 12 can properly absorb the decolorizing agent. The liquid absorbing section 12 does not have to include the decolorizing agent supply tank 13, and the decolorizing agent may be supplied to the storage tank 11 by other means as long as the liquid level of the decolorizing agent can be properly maintained.

The liquid absorbing portion 12 is configured by laminating a decolorizing agent holding material 14 on the upper surface. The decolorizing agent holding member 14 is not particularly limited as long as it can absorb and hold the decolorizing agent sucked up from the through holes 12a. . From the upper surface of the liquid absorbing portion 12 that has sucked up the decolorizing agent, the liquid decolorizing agent soaks into the entire decolorizing agent holding material 14 due to the capillary phenomenon caused by the fibers of the paper.

As shown in FIG. 3(b), the paper located in the uppermost layer of the liquid absorbing portion 12 is pressed with a fiber cloth T for impregnating the decolorizing agent, so that the fiber cloth T is impregnated with the decolorizing agent permeated into the paper. . As the paper located in the uppermost layer is pressed against the fiber cloth T many times, there is a risk that stains remaining on the surface of the fiber cloth T may adhere or the surface of the paper may be scraped and torn. . Therefore, the paper located in the uppermost layer is configured to be replaceable by peeling from the uppermost layer of the liquid absorbing portion 12 . When the paper located on the top layer is peeled off, the paper located below is newly located on the top layer. Since the surface of the paper newly positioned in the uppermost layer is kept clean and the decolorizing agent is permeated, the fiber cloth T can be impregnated with the decolorizing agent by pressing the fiber cloth T. .
In addition, a mask sheet M having openings in the area of the fiber cloth T to be decolorized is interposed between the paper located in the uppermost layer and the fiber cloth T, and the decolorizing agent is soaked while adjusting the amount of the decolorizing agent. good too.
Although not shown in FIG. 3, the liquid absorbing section 12 may include pressing means for pressing the fiber cloth T placed so as to come into contact with the paper located in the uppermost layer.

"Modification 1"
FIG. 4 shows a configuration example of the absorption processing section 10A of Modification 1 using the dip method.
In the absorption processing section 10A, as shown in FIG. 4, the fiber cloth T is conveyed by the conveying roll pair 15 in a state of being immersed in the decolorizing agent in the dip tank 11A, and the absorption processing is performed in which the fiber cloth T is impregnated with the decolorizing agent. It is a dip device that performs The installation position and number of the transport roll pairs 15 are not particularly limited to the installation position and number shown in FIG. 4 as long as the fiber cloth T can be transported.

The absorption processing unit 10A includes a dip tank 11A containing a decolorizing agent, a decolorizing agent supply pump (not shown) that supplies the decolorizing agent to the dipping tank 11A, a decolorizing agent supply slit nozzle 12A, and a decolorizing agent overflowing from the dip tank 11A. and a storage tank 13A for collecting the agent.
The storage tank 13A also serves as a tank for supplying the decolorizing agent to the dip tank 11A, and the absorption processing unit 10A is a dip device that circulates and uses the decolorizing agent.

The decolorizing agent is sent from a decolorizing agent suction port 13Aa of the storage tank 13A to a decolorizing agent supply pipe 13Ab by a decolorizing agent supply pump (not shown), and a decolorizing agent supply slit nozzle connected to the outlet of the decolorizing agent supply pipe 13Ab. It is supplied to the dip tank 11A via 12A. By supplying the decolorizing agent through the decolorizing agent supply slit nozzle 12A, the new decolorizing agent is uniformly and continuously supplied to the fiber cloth T, and the decolorizing agent in the dipping tank 11A is flow-circulated. Dirt and the like dropped from the surface can be quickly removed. The decolorizing agent overflowing from the dip tank 11A returns to the storage tank 13A through the decolorizing agent collecting port 13Ad via the decolorizing agent collecting pipe 13Ac.

The dip-type absorption processing unit 10A includes a dip tank 11A containing a decolorizing agent and a pair of conveying rolls 15 for conveying the fiber cloth T immersed in the decolorizing agent in the dip tank 11A. The decolorant supply slit nozzle 12A, the storage tank 13A, and the like do not necessarily have to be provided as long as the decolorant supply slit nozzle 12A and the storage tank 13A can be provided.

"Modification 2"
FIG. 5 shows a configuration example of an absorption processing section 10B of Modified Example 2 using a roller system.
As shown in FIG. 5, the absorption processing section 10B includes a coating roller 11B, a sponge roller 12B, and a cleaning section 13B.

The application roller 11B applies the decolorant to the surface of the fiber cloth T. As shown in FIG. The application roller 11B is a roller extending in the width direction of the fiber cloth T, and moves in a direction crossing the width direction of the fiber cloth T. As shown in FIG. A decolorizing agent to be applied is supplied from a decolorizing agent supply unit (not shown) to the application roller 11B. move in the indicated arrow R direction. The decolorizing agent is applied onto the fiber cloth T by the rotation of the application roller 11B. At this time, the amount of decolorizing agent applied onto the fiber cloth T is a sufficient amount that can be uniformly applied to the surface of the fiber cloth T. As shown in FIG.
Alternatively, a mask sheet M having openings in the areas of the fiber cloth T to be decolorized may be interposed between the application roller 11B and the fiber cloth T to apply the decolorizing agent only to the necessary areas of the fiber cloth T.

The sponge roller 12B moves relative to the fiber cloth T and slides on the surface of the fiber cloth T while contacting the surface of the fiber cloth T coated with the decolorant with a predetermined pressure.
By sliding the sponge roller 12B on the surface of the fiber cloth T while being pressed with a predetermined pressure, the decolorizing agent applied by the application roller 11B can be pressed against the surface of the fiber cloth T. , the fiber cloth T can be uniformly impregnated with the decolorizing agent.
The sponge roller 12B can absorb a part of the decolorizing agent applied to the fiber cloth T by the applying roller 11B, so that the excessively applied decolorizing agent can be absorbed.

The cleaning section 13B cleans the surface of the sponge roller 12B while recovering the decolorizing agent absorbed by the sponge roller 12B. In the present embodiment, the sponge roller 12B slides on the surface of the fiber cloth T. At this time, dirt on the surface of the fiber cloth T contaminates the surface of the sponge roller 12B and reduces the absorbency of the sponge roller 12B. or cause secondary pollution. In this embodiment, by cleaning the surface of the sponge roller 12B with the cleaning unit 13B, it is possible to prevent deterioration of absorbency and secondary contamination of the sponge roller 12B.

(drawing part)
FIG. 6 is a diagram showing a configuration example of the narrowing processing section 20. As shown in FIG.
The squeezing unit 20 includes a conveying roller 21, a first squeezing roller 22, a second squeezing roller 23, a pressure bracket 24, and a storage container 25 for collecting the decolorant squeezed from the fiber cloth T. .

The conveying roller 21 is rotationally driven in the direction of the arrow R1 by a driving source (not shown), and conveys the fiber cloth T while sandwiching it between the first squeezing roller 22 and the second squeezing roller 23 in contact with each other.
The first squeezing roller 22 and the second squeezing roller 23 are in contact with the peripheral surface of the conveying roller 21 and handle (squeeze) the fiber cloth T wrapped and carried on the peripheral surface of the conveying roller 21 to obtain the fiber cloth T. Squeeze out some of the soaked decolorant. In this embodiment, the first squeezing roller 22 and the second squeezing roller 23 have the same diameter and are arranged concentrically with respect to the center O of the conveying roller 21 . The squeezing rollers 23 may have different diameters. Also, three or more squeezing rollers may be arranged.

The first squeezing roller 22 and the second squeezing roller 23 are held by a pressure bracket 24 which is the same holding member, and arranged along the peripheral surface of the conveying roller 21 . The pressure bracket 24 is biased in the direction of arrow R2 toward the peripheral surface of the transport roller 21 , and the first squeeze roller 22 and the second squeeze roller 23 are pressed against the peripheral surface of the transport roller 21 . By holding a plurality of squeezing rollers on the same pressing bracket in this way, the squeezing force (pressing force) between the plurality of squeezing rollers can be made uniform.

The fiber cloth T impregnated with the decolorant is uniformly pressed (squeezed) at the nip portion between the transport roller 21 and the first squeeze roller 22 and the nip portion between the transport roller 21 and the second squeeze roller 23 . A decolorant is squeezed into a predetermined amount. Here, the predetermined amount can be set by adjusting the pressing force of the pressing bracket 24 .
The decolorizing agent squeezed on the conveying rollers 21 is collected in the storage container 25 .

In the present embodiment, the configuration including the first squeezing roller 22 and the second squeezing roller 23 that are pressed against the peripheral surface of the conveying roller 21 has been described. A press method may be used in which the fiber cloth T is directly pressed to squeeze out the decolorizing agent.

(Penetration amount control)
The absorption processing unit 10 designates a region of the fiber cloth T to be decolored, and specifies at least one of the type of the fiber cloth T to be coated with the decolorizing agent, the thickness of the fiber cloth T, and the seams of the fiber cloth T, or a combination thereof. It is also possible to adjust the penetration amount of the decolorizing agent according to the condition.
Types of the fiber cloth T include, for example, polyester fiber, acetate fiber, polylactic acid fiber, polyphenylene sulfide fiber, vinylon fiber, polyamide fiber, polypropylene fiber, or any other natural or synthetic fiber material, which may be used singly, blended, or mixed. Examples include woven and knitted fabrics and nonwoven fabrics that are used in combination by twisting, mixed weaving, mixed knitting, and the like.
The thickness of the fiber cloth T differs depending on the thickness of the target to be impregnated with the decolorizing agent, such as the thickness of the fiber cloth T itself and the thickness of the overlapped portion. ), the openings of the mask sheet M are adjusted to increase the permeation amount of the decolorant.
In addition, the areas corresponding to the seams of the fiber cloth T are subjected to an absorption treatment so as to increase the amount of the decolorant soaked in. As shown in FIG.

(Heat treatment part)
FIG. 7 shows a configuration example of the heat processing section 30. As shown in FIG.
The heat processing section 30 includes a platen 31 that holds the fiber cloth T, an absorber F that absorbs and holds the decolorizing agent containing the dye that moves from the fiber cloth T that is contact-heated, and the fiber cloth T impregnated with the decolorizing agent. is provided with a heat press plate 32 for contact heating through the absorbent F.

The platen 31 is provided with a fixture (not shown) so that the fiber cloth T can be positioned so that the bleached portion is on the upper surface and can be held in a taut, wrinkle-free and flat state. Moreover, the surface of the platen 31 is preferably coated with a fluorine resin coating or a Teflon (registered trademark) sheet. This improves heat resistance, corrosion resistance, and non-adhesiveness.

The number of platens 31 is not limited to one. For example, two platens may be provided so as to be alternately slidable. By providing a plurality of platens 31 slidably, while the fiber cloth T fixed to one platen 31 is being contact-heated, the fixing operation of the fiber cloth T to the other platen 31 can be performed. Efficiency can be increased.
The heat processing section 30 may be configured using a known rotary heat press. By using a rotary heat press, it is possible to speed up the heat treatment.

The absorber F may be any material as long as it has resistance to the decolorizing agent and can withstand the heating of the heat press plate 32 . The material of the absorbent body F is not particularly limited as long as it can move the decolorizing agent in a liquid phase by, for example, capillary action, and may be paper, cloth, non-woven fabric, or other materials such as It may be made of ceramic, resin, or the like. Moreover, the shape of the absorbent body F is not particularly limited, and may be, for example, a sheet shape or other shapes.

The absorption amount of the decolorizing agent required for the absorber F varies depending on the amount of the decolorizing agent soaked into the fiber cloth T, the heating temperature and the heating time of the heat press plate 32, and the like. The absorbent body F can be replaced with an absorbent body F having a different thickness and absorption power according to the required absorption amount of the decolorant to be impregnated into the fiber cloth T.

As shown in FIG. 7, the heat press plate 32 has a heat generating portion 32A in which a nichrome wire (not shown) is arranged, a heat insulating portion 32B made of, for example, silicone rubber, and a heat generating portion 32A. It consists of a heat storage section 32C and is configured to be able to move up and down with respect to the platen 31 .
The heat press plate 32 heats the fiber cloth T from above the absorber F to a temperature at which the decolorant and the dye move. Specifically, the fiber cloth T placed on the platen 31 is heated at a temperature equal to or lower than the boiling point of the decolorizing agent soaked into the fiber cloth T. As shown in FIG. The temperature below the boiling point of the decolorant is, for example, 120° C. or higher, or 150° C. or higher, 210° C. or lower, or 190° C. or lower, depending on the decolorant. By setting the heating temperature to the boiling point of the bleaching agent or less, it is possible to suppress thermal damage such as heat shrinkage of the fiber cloth T, for example, the polyester cloth. In particular, by heating at a temperature below the boiling point minus 20° C., it is possible to decolorize the fiber cloth T for a certain heating time while suppressing thermal damage.
The heating time is appropriately determined according to the desired degree of decolorization, and may be, for example, 30 seconds or longer, or 1 minute or longer, or 30 minutes or shorter, or 3 minutes or shorter.

FIG. 8 schematically shows the movement of the decolorant from the fiber cloth T to the absorbent body F in the heat treatment section 30. As shown in FIG. In the decolorizing apparatus 1 according to the present embodiment, as shown in FIG. 8A, the fiber cloth T impregnated with the decolorizing agent (indicated by symbol D in the drawing) is laid flat on the platen 31 of the heating section 30. , the absorber F is brought into contact with the contact heating side of the fiber cloth T, and the heat press plate 32 heated to a predetermined temperature is lowered and pressurized.
The fiber cloth T is heated via the absorber F, and the heat is transferred to the decolorizing agent, which turns into a liquid phase. The dye dyed on the fiber cloth T (indicated by symbol PG in the figure) is separated from the fiber cloth T together with the liquefied decolorant, and is separated from the fiber cloth T by the capillary force of the absorber F, as shown in FIG. 8(b). Move to absorber F.

The decolorizing agent that has moved to the absorber F contacts the heat press plate 32 and evaporates (indicated by arrow R in the figure), and the vapor is released upward. As a result, as shown in FIG. 8(c), the side of the absorbent F that is in contact with the heat press plate 32 dries, and the dye moves again from the fiber cloth T to the absorbent F together with the decolorizing agent by capillary force.
As described above, in the heat processing section 30, the process of heating the fiber cloth T via the absorbent body F to move the decolorant to the absorbent body F together with the dye dyed or printed on the fiber cloth T is continued. and improve decolorization performance.

(Recovery Department)
FIG. 9 is a diagram for explaining a configuration example of a recovery unit 40 for recovering a part of the decolorizing agent soaked into the fiber cloth T, and FIG. 10 is a drawing showing vacuum extraction of the decolorizing agent from the absorber F to which the decolorizing agent has moved and recovering it as a liquid. It is a figure explaining the structural example of the collection|recovery part which carries out.

As shown in FIG. 9, the recovery unit 40 has a configuration for recovering the vapor generated from the decolorizing agent when the fiber cloth T is heated in the heat processing unit 30 as a liquid. , a pressure raising unit 42 that raises the pressure in the recovery chamber 41 to create a high pressure state in which the vapor is liquefied, and a liquid separation unit 43 that separates the liquid generated by the liquefaction and discharges the gas to the outside.
When the vapor generated from the decolorizing agent when the fiber cloth T is heated is recovered as a liquid, the fiber cloth T impregnated with the decolorizing agent is heat-treated to decolorize the dye. In some cases, the decolorizing agent remaining on the fiber cloth T is recovered by heating the fiber cloth T after decolorization. In either case, vapor generated from the decolorant when the fiber cloth T is heated in the recovery unit 40 can be recovered as a liquid.

The recovery chamber 41 is arranged vertically above the heat press plate 32 with its lower end open, and the opening is provided with a pressure riser 42 . In the present embodiment, the pressure increasing unit 42 is composed of a suction fan that sucks gas including steam and feeds it into the recovery chamber 41 .
The pressure increasing unit 42 is not limited to the suction fan, and any other structure that can increase the pressure in the recovery chamber 41 can be used. Here, the pressure at which the inside of the recovery chamber 41 is brought into a high pressure state and the vapor is liquefied is about 30 to 50 Pa.

The liquid separation part 43 has a gas passage member that discharges the gas in the recovery chamber 41 to the outside while maintaining the high pressure state in the recovery chamber 41 and leaves the liquid liquefied by the high pressure in the recovery chamber 41 . The gas that has passed through the gas passage member becomes dry gas.
As the gas-permeable material, a porous body having a large number of small holes through which gas can pass can be used. When a porous body is used, the liquefied liquid LQ is received and stored in the storage section 44 arranged vertically below the liquid separation section 43 . The reservoir 44 can be removed, and the vapor recovered as the liquid LQ can be reused as a decolorizing agent.

The collecting unit 40 is configured to vacuum-extract the decolorizing agent from the absorbent body F to which the decolorizing agent has moved and collect it as a liquid. An airtight container 45 for evaporating the decolorizing agent, a cooling device 46 for cooling and liquefying the vapor generated in the airtight container 45, a recovery tank 47 for storing the decolorizing agent liquefied by the cooling device 46, and a recovery tank 47. and a decompression device 48 for reducing the pressure in the airtight container 45 .

First, the absorber F to which the decolorizing agent has migrated is put into the airtight container 45, and heating steam is supplied to heat the inside of the airtight container 45 to a predetermined temperature (for example, the boiling point of the decolorizing agent or higher). do. The heat applied to the airtight container 45 is transferred to the absorber F, and the decolorizing agent absorbed by the absorber F is accelerated to evaporate.

Further, when the decompression device 48 is driven, the vapor and air in the airtight container 45 are sucked, and all or part of the vapor generated by evaporation of the decolorizing agent of the absorber F in the airtight container 45 is , is cooled in the cooling device 46 and returns to a liquid state. The liquid or liquid and vapor that have passed through the cooling device 46 are ejected into the recovery tank 47 . The liquid LQ ejected into the recovery tank 47 can be reused as a decolorizing agent.

(reproduction processing unit)
FIG. 11 is a diagram for explaining a configuration example of the reproduction processing unit 50. As shown in FIG.
The regeneration processing unit 50 includes a water tank unit 51 that stores the cleaning liquid L made of RO water or the like from which impurities have been removed in advance, and maintains the temperature of the cleaning liquid L at a predetermined level while reducing the content of gas (for example, air) contained in the cleaning liquid L. A liquid control unit 52 (not shown), a vibration control unit 54 including a pair of ultrasonic vibration units 53 arranged facing each other and in parallel so as to sandwich the absorber F in the cleaning liquid L, the liquid control unit 52 and vibration and a control mechanism 55 for controlling the operation of the control unit 54, and the decolorizing agent adhering to the surface of the absorber F immersed in the cleaning liquid L and the decolorizing agent remaining inside the absorber F are formed by ultrasonic waves. It is removed by a shock wave that accompanies the rupture of the cavity.
As the cleaning liquid L, the decolorizing agent permeated into the fiber cloth T may be used. In this case, the decolorant used for washing is separated from the dye and reused.

The cleaning liquid L used to clean the absorber F to which the decolorant has migrated contains the dye dyed or printed on the fiber cloth T. As shown in FIG. Such a washing liquid L is concentrated by RO membrane treatment and separated from the dye as a permeated liquid, and the separated dye can be reused for dyeing again.
In the RO membrane treatment, a known RO membrane and module are used, and the washing liquid L is pressurized and supplied by a pressure pump to separate the dye and water. The RO membrane is a semi-permeable membrane that separates the dye, and the module can be a flat membrane type, tubular type, spiral type, hollow fiber type, etc. module equipped with this RO membrane. Depending on the concentration of the dye in the permeated liquid, the RO membrane treatment can be carried out in a one-stage or two-stage RO membrane apparatus in a transient or circulating manner.

(2) Decolorization Process FIG. 12 is a flow chart showing the flow of the decolorization process of the decolorization method according to the present embodiment.
The decolorizing treatment of the fiber cloth T according to the present embodiment includes an absorption treatment S101 in which the dyed or printed fiber cloth T is impregnated with the decolorizing agent, and heating and pressurizing the fiber cloth T to remove the decolorizing agent impregnated into the fiber cloth T. A transfer step S102 in which the fiber cloth T is transferred to the absorbent body F together with the dye dyed or printed on the fiber cloth T, a recovery step S103 in which part of the decolorizing agent soaked into the fiber cloth T is collected, and the absorbent body F to which the decolorizing agent has been transferred is removed. and a regeneration step S104 in which the absorbent body F is washed in the washing liquid L and made available as a new absorbent body F.

(Absorption treatment step: S101)
The fiber cloth T (indicated by symbol T in FIG. 2) used in this embodiment is a cloth whose one surface is printed or dyed with a dye. This causes the dye to move to the absorber F for decolorization.

First, the dyed or printed fiber cloth T is impregnated with a decolorant. Specifically, the decolorizing agent holding material 14 is layered on the upper surface of the liquid absorbing portion 12 arranged in the storage tank 11 for storing the decolorizing agent of the absorption processing portion 10 to absorb the decolorizing agent. Then, the fiber cloth T is pressed against the decolorizing agent holding material 14 permeated with the decolorizing agent to impregnate the decolorizing agent. The absorption treatment for impregnating the decolorant into the fiber cloth T may be performed by the absorption treatment section 10A using a dip method or the absorption treatment section 10B using a roller method.

The fiber cloth T impregnated with the decolorizing agent is nipped between the conveying roller 21 and the first squeezing roller 22 of the squeezing section 20 and at the nipping portion between the conveying roller 21 and the second squeezing roller 23, respectively. A predetermined amount of decolorizing agent is squeezed by pressing (squeezing) uniformly.

(Movement step: S102)
First, the fiber cloth T impregnated with the decolorizing agent is positioned on the platen 31 of the heat processing section 30 so that the decolorized portion faces upward, and is fixed with a fixture (not shown). Then, the absorbent body F is brought into contact with the upper surface of the fiber cloth T impregnated with the decolorizing agent, and the heat press plate 32 is lowered to pressurize the fiber cloth T from above the absorbent body F at a temperature below the boiling point of the decolorizing agent. do.
The temperature below the boiling point of the decolorant is, for example, 120° C. or higher, or 150° C. or higher, 210° C. or lower, or 190° C. or lower, depending on the decolorant. The heating time is appropriately determined according to the desired degree of decolorization, and may be, for example, 30 seconds or more or 1 minute or more, or 10 minutes or less or 3 minutes or less. The time is set so that a sufficient bleaching effect can be obtained while suppressing thermal damage to T.

The fiber cloth T is heated through the absorber F, and the heat is transferred to the decolorizing agent, which turns into a liquid phase. The dye dyed on the fiber cloth T is separated from the fiber cloth T together with the liquefied decolorizing agent, and moves to the absorber F due to the capillary force of the absorber F.
The decolorizing agent that has moved to the absorber F contacts the heat press plate 32 and evaporates, and the vapor is emitted upward. As a result, the side of the absorber F in contact with the heat press plate 32 is dried, and the dye moves from the fiber cloth T to the absorber F again by the capillary force together with the decolorizing agent.

The vapor generated from the decolorizing agent when the fiber cloth T is heated in the moving step S102 is collected as a liquid by simultaneously carrying out a part of the collecting step S103 for collecting a part of the decolorizing agent soaked into the fiber cloth T. (S103B). That is, the recovery chamber 41 is arranged vertically above the heat press plate 32 and has an open bottom end. The inside of the recovery chamber 41 is maintained at a high pressure of about 30 to 50 Pa at which the sent vapor liquefies, and is recovered as a decolorizing agent so as to be reusable.

(Recovery step: S103)
The recovery step S103 includes a first recovery step S103A performed simultaneously with the transfer step S102 in which the fiber cloth T impregnated with the decolorant is heat-treated to decolorize the dye, and the fiber cloth after the dye has been decolored by the heat treatment. There is a second recovery step S103B in which the fiber cloth T is heated to recover the decolorant remaining on the fiber cloth T.

In the second recovery step S103B, the absorber F to which the decolorizing agent has been transferred from the fiber cloth T is put into the airtight container 45, and the heating steam is supplied to reduce the temperature inside the airtight container 45 to a predetermined temperature. (eg, above the boiling point of the decolorant).
Also, by driving the decompression device 48, the vapor and air generated by evaporation of the decolorizing agent of the absorber F in the airtight container 45 are sucked and led to the cooling device 46, where they are cooled by the cooling device 46 and liquefied. . The liquid LQ liquefied by the cooling device 46, or the liquid LQ and vapor are ejected into the recovery tank 47, and the liquid LQ can be reused as a decolorizing agent.

(Regeneration step: S104)
In the regeneration step S104, the absorber F to which the decolorizing agent has been transferred is washed in the washing liquid L so that it can be used as a new absorber F. In the regeneration step S104, the decolorizing agent adhering to the surface of the absorber F immersed in a cleaning liquid L such as RO water from which impurities have been previously removed and the decolorizing agent remaining inside the absorber F are formed by ultrasonic waves. It is removed by the shock wave generated by the rupture of the cavity. As the cleaning liquid L, the decolorizing agent permeated into the fiber cloth T may be used. In this case, the decolorant used for washing is separated from the dye and reused.

The washing liquid L obtained by washing the absorber F to which the decolorizing agent has migrated is concentrated by the RO membrane treatment and separated from the dye as a permeated liquid, and the separated dye can be reused for dyeing again.

According to the decolorizing apparatus 1 according to the present embodiment, the dyed or printed fiber cloth T is impregnated with the necessary amount of the decolorizing agent in the necessary area. The heat press plate 32 heats the fiber cloth T from above the absorber F to a temperature below the boiling point of the decolorizing agent so that the decolorizing agent and the dye move to a temperature at which the decolorizing agent and the dye are transferred to the absorber F. Move and evaporate. By continuing this process, it is possible to improve the decolorization performance. The vapor generated from the decolorizing agent when the fiber cloth T is heated by the heat press plate 32 is liquefied and recovered as liquid LQ, which can be reused as the decolorizing agent.

The absorber F to which the decolorizing agent has migrated is washed in the cleaning liquid L and can be used as a new absorber F, and the cleaning liquid L that has washed the absorber F to which the decolorizing agent has migrated is concentrated by RO membrane treatment and permeates. It separates from the dye as a liquid, and the separated dye can be reused for dyeing again.

DESCRIPTION OF SYMBOLS 1... Decolorization apparatus 10... Absorption process part, 20... Squeeze process part, 30... Heat process part, 40... Recovery part, 50... Regeneration process part, 60... Control Part T... Fiber cloth, F... Absorbent, M... Mask sheet

Claims (13)

Absorption treatment means for immersing a dyed or printed fiber cloth in a decolorizing agent to impregnate the fiber cloth with the decolorizing agent;
squeezing means for adjusting the amount of the decolorizing agent soaked into the fiber cloth to a predetermined amount;
moving means for heating and pressurizing the fiber cloth to move the decolorizing agent permeated into the fiber cloth to an absorbent body together with the dye dyed or printed on the fiber cloth;
recovery means for recovering a part of the decolorizing agent soaked into the fiber cloth,
A decolorization device characterized by: The transfer means heats the fiber cloth via the absorbent body to transfer the decolorizing agent to the absorbent body together with the dye dyed or printed on the fiber cloth.
The decolorization apparatus according to claim 1, characterized by: The moving means contact-heats the absorbent at a temperature below the boiling point of the decolorant.
The decolorization device according to claim 2 , characterized in that: The absorber is replaceable according to the required absorption amount of the permeated decolorizing agent,
The decolorization apparatus according to claim 1, characterized by: The collecting means collects the decolorizing agent that has not been absorbed by the fiber cloth from the permeated decolorizing agent.
The decolorization apparatus according to claim 1, characterized by: The recovery means recovers steam generated from the decolorizing agent when heated by the moving means.
The decolorization apparatus according to claim 1, characterized by: The collecting means extracts the decolorizing agent from the absorber to which the decolorizing agent has moved and collects it as a liquid.
The decolorization apparatus according to claim 1, characterized by: The collecting means heats the decolorized fiber cloth to collect the decolorizing agent.
The decolorization apparatus according to claim 1, characterized by: a decolorizing agent recycling means for re-impregnating the decolorizing agent collected by the collecting means with the absorption processing means;
The decolorization apparatus according to claim 1, characterized by: It further comprises an absorber regeneration means for washing the absorber to which the decolorizing agent has been transferred with a washing liquid so that it can be used as the absorber for moving the decolorizing agent again by the transfer means.
The decolorization apparatus according to claim 1, characterized by: extracting and recovering the dye that has migrated from the fiber cloth from the washing liquid;
The decolorization device according to claim 10 , characterized by: an absorption treatment step of soaking the dyed or printed fiber cloth in the decolorizing agent to impregnate the fiber cloth with the decolorizing agent;
a squeezing step of adjusting the decolorizing agent permeated into the fiber cloth to a predetermined amount;
a transfer step of heating and pressurizing the fiber cloth to transfer the decolorizing agent permeated into the fiber cloth to the absorber together with the dye dyed or printed on the fiber cloth;
a recovery step of recovering a portion of the decolorizing agent soaked into the fiber cloth;
Using the decolorization device according to any one of claims 1 to 11 as the decolorization device,
A decolorization method characterized by: Further comprising a regeneration step of washing the absorber to which the decolorizing agent has migrated with a washing liquid so that it can be used as a new absorber.
The decolorization method according to claim 12 , characterized by:

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