JP2005126623A - Method for recovering polyester-based resin substrate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for recovering a substrate from a recording material, in which a coat is formed on the substrate by using a natural polymer-based or synthetic polymer-based binder, in a state reusable as a raw material for the recording material. <P>SOLUTION: The method for recovering the polyester-based resin substrate comprises the steps of treating a recording material having at least one layer coat on the polyester-based substrate with an alkaline treating liquid, peeling off the coat from the substrate, and recovering the substrate, where the recording material is finely cut into a chip state by using a cutting apparatus equipped with a first chopper arranged at 10-80° against the recording material on a conveyer line and a second chopper arranged at 10-160° against the first chopper. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for recovering a polyester resin support from a recording material having at least one coating film on the polyester resin support.

  Polyester resins such as polyethylene terephthalate and polyethylene naphthalate are used as a support for recording materials such as silver halide photographic light-sensitive materials, heat-developable photographic light-sensitive materials, ink-jet recording materials, and magnetic recording materials because of their excellent characteristics, and liquid crystal displays. It is also widely used in the information recording industry as an optical film used in various display devices of organic EL displays. The case of a photographic photosensitive material as an example of a recording material using a polyester resin support will be schematically described with reference to the drawings.

  FIG. 10 is a schematic sectional view of a photographic light-sensitive material.

  In the figure, 12 indicates a photographic light-sensitive material. 12a indicates a polyester resin support, and 12b and 12c indicate undercoat layers. Reference numeral 12d represents a photosensitive layer of a coating film formed on the polyester resin support 12a via the undercoat layer 12b, and 12e represents a protective layer of the coating film formed on the photosensitive layer 12d. 12f shows the backing layer of the coating film formed on the polyester-type resin support body 12a via the undercoat layer 12c. The photosensitive layer 12d may be composed of multiple layers as required, or may not be coated with a protective layer. The photosensitive layer 12d, the protective layer 12e, and the backing layer are selected and used depending on the type of photographic photosensitive material produced by a natural polymer binder or a synthetic polymer binder. In the present invention, in the case of a photographic light-sensitive material, the coating film is a generic name including a photosensitive layer, a protective layer, and a backing layer.

  In recent years, the information recording industry has undergone remarkable development and the number of polyester resin materials used has been rapidly increasing. Along with this, the amount of waste products (for example, production scraps, defective products generated in the product inspection process, etc.) and used products generated in the manufacturing process are increasing.

  In fact, most of these polyester resin wastes are used in landfill or incineration without being effectively used, but in landfill there is no decay, and incineration generates dioxins depending on the incineration conditions. It is also a cause of increasing the global environmental load. Moreover, there is a problem of loss of polyester raw material, which is not preferable from the viewpoint of resource saving.

  In particular, these polyester resins are used as a support, and photosensitive materials using synthetic polymer materials as binders for coating films cannot be recovered in a state where they can be reused as a polyester resin support. In most cases, used products and production scraps were not effectively utilized, and inevitably, incineration treatment was performed at a high temperature in order to suppress the generation of dioxins. For this reason, the incinerator is quickly damaged due to the high-temperature incineration process, which causes a problem of maintenance costs.

  In order to solve these problems, methods for recovering a polyester resin support from a recording material using the polyester resin support have been studied. For example, a printing plate-making film using polyethylene terephthalate (PET) as a support as a polyester resin with a copolymer of vinylidene chloride, itaconic acid, acrylic acid or the like as an undercoat layer is shredded to an appropriate size and alkali metal A method is known in which PET is recovered by heat treatment at 50 to 95 ° C. together with a cationic surfactant in an aqueous salt solution (see, for example, Patent Document 1).

  A polyester resin support having an undercoat layer (hereinafter also simply referred to as a support) and a silver halide photographic light-sensitive material using the support are shredded into chips, and then a surfactant (nonionic surfactant, cationic interface). And a method of recovering the support by heat treatment with stirring at a temperature of 70 to 100 ° C. with an alkaline treatment liquid containing sodium hydroxide or potassium hydroxide. (For example, refer to Patent Document 2).

  However, in the collection methods described in Patent Document 1 and Patent Document 2, when a support is recovered from a recording material on which a synthetic polymer binder is used on a support and a coating film is formed, the peeled coating film and alkaline treatment Purity to be reused as a raw material for a support for recording materials due to contamination of the support on which sludge generated by treatment with the liquid is reattached, the support on which the coating film has not peeled off, the peeled coating film, etc. It is inadequate and cannot be used at present.

  In particular, when reusing as a raw material for a support for recording material, the following items are listed as required items. 1) There is no contamination with impurities that adversely affect performance (for example, in the case of photographic materials, fog, sensitivity abnormalities such as sensitization / desensitization, etc.) 2) Physical properties (color tone, molecular weight distribution, etc.) are changed 3) The absence of foreign matter that adversely affects the image when taken, and the like.

From these situations, a support for a recording material (especially for a photographic light sensitive material having a high purity requirement) from a recording material in which a coating film is formed using a natural polymer binder and a synthetic polymer binder for the support. Development of a method for recovering a support in a state where it can be reused as a raw material is desired.
Japanese Patent Laid-Open No. 11-302580 JP-A-8-146560

  The present invention has been made in view of the above circumstances, and its object is to provide a recording material for a recording material from a recording material in which a coating film is formed using a natural polymer binder or a synthetic polymer binder on a support. The object is to provide a method for recovering a support in a state where it can be reused as a raw material for the support.

The above object of the present invention has been achieved by the following constitution.
(Claim 1)
A polyester-based material in which a recording material having at least one coating film on a polyester-based resin support is treated with an alkaline processing liquid, the coating film is peeled off from the polyester-based resin support, and then the polyester-based resin support is recovered. In the resin support recovery method,
The recording material has a first shredder disposed at 10 to 80 ° with respect to the recording material on the conveyance path, and a second shredder disposed at 10 to 160 ° with respect to the first shredder. A polyester-based resin support recovery method, comprising: cutting into chips using a shredding device having a machine.
(Claim 2)
The first shredder and the second shredder are flat shredders that have a flat blade with a blade edge angle of 5 to 80 °, and shred at a lowering angle of 0.1 to 70 °. The method for recovering a polyester resin support according to claim 1.
(Claim 3)
The polyester material according to claim 1 or 2, wherein the recording material shredded by the first shredder is held by a holding means until shredded by the second shredder. Resin support recovery method.
(Claim 4)
A polyester-based material in which a recording material having at least one coating film on a polyester-based resin support is treated with an alkaline processing liquid, the coating film is peeled off from the polyester-based resin support, and then the polyester-based resin support is recovered. In the resin support recovery method,
The recording material uses a shredding device having a first shredding machine and a second shredding machine arranged so that the axis of the shredding machine is perpendicular to the recording material on the conveyance path. A method for recovering a polyester-based resin support, which is chopped into chips.
(Claim 5)
The first shredder has a die-cut slit roll and a backing roll that rotate in opposite directions, and the die-cut slit roll has at least one cutting blade having a blade edge angle of 10 to 85 °. The method for recovering a polyester resin support according to claim 4.
(Claim 6)
The first shredder has at least one set of rotating blades composed of a set of upper blades and lower blades rotating in opposite directions, and the edge angles of the upper blades and the lower blades are 30 to 90 °, respectively, and The method for recovering a polyester-based resin support according to claim 4, wherein a difference in blade edge angle between the upper blade and the lower blade is 0 to 15 °.
(Claim 7)
The polyester resin support according to any one of claims 4 to 6, wherein the second shredder has a crosscut roll having at least one crosscut blade having a blade edge angle of 10 to 85 °. Body recovery method.
(Claim 8)
The method for recovering a polyester resin support according to any one of claims 1 to 7, wherein the coating film has a natural polymer binder or a synthetic polymer binder.
(Claim 9)
The method for recovering a polyester resin support according to any one of claims 1 to 8, wherein the recording material is an indeterminate shape having an outer size of 0.1 to 100 mm.

  As a result of diligent investigations to achieve the above-mentioned problems, the inventors used a conventional rotary crusher to produce a recording material in which a coating film is formed using a natural polymer binder or a synthetic polymer binder on a support. When the support is recovered in the form of a chip, it has been found that impurities are mixed in as the chip becomes smaller, and it is difficult to reuse it as a raw material for the support of the photographic photosensitive material.

  As a cause of increased contamination of impurities, when the recording material is made into a chip shape, the shearing force applied to the recording material causes fine cracks, cracks, and in-layer destruction of the support, and these cracks and cracks are generated. It was presumed that the peeled coating film was sandwiched at the in-layer fractured part, or sludge entered, so that it could not be removed until the final stage and was brought in as an impurity.

  On the other hand, when recovering the support from the recording material, even if the chip is made smaller, the shearing force applied to the recording material is reduced so that fine cracks, cracks and in-layer destruction of the support do not occur at the periphery. It has been found that it is effective to use the chip-shaped recording material produced in this way, and it is as soon as the present invention has been achieved.

  Provided is a method for recovering a support from a recording material in which a coating film is formed using a natural polymer binder or a synthetic polymer binder on the support in a state where it can be reused as a raw material for the support for the recording material. As a result, the recovery yield of the support can be greatly improved. In addition, the expenses required for the incineration process are eliminated, and it is possible to contribute to environmental measures.

  Embodiments according to the present invention will be described with reference to FIGS. 1 to 9, but the present invention is not limited thereto.

  FIG. 1 is a schematic view showing an example of a method for recovering a support.

  In the figure, reference numeral 1 denotes a first chemical processing unit that performs processing with an alkaline processing liquid. 101 is a chip-shaped recording material 102 having a coating film on a support, placed in a treatment tank 101a, and an alkaline treatment liquid 103 containing sodium hydroxide or potassium hydroxide at a temperature of 70 to 100 ° C. The processing apparatus which heat-processes, stirring with the stirrer 101b, and peels a coating film from a support body is shown. As solid content concentration when processing the chip-shaped recording material 102 with the alkaline processing liquid 103 in the processing tank 101a, 1-30 mass% is preferable.

  By subjecting the chip-shaped recording material 102 to heat treatment by the processing apparatus 1, in the alkaline processing liquid 103, the peeled coating film, the support from which the coating film has been peeled, and the support in which a part of the coating film remains. And the generated sludge, the peeled coating film, and the support to which the generated sludge adheres. In the present invention, all of these are referred to as a solid material.

  Examples of the chopped chip-shaped recording material 102 include discarded objects (for example, production scraps, defective products generated in the product inspection process) generated in the manufacturing process, used products, and the like. The shredded chip-shaped recording material is preferably indeterminate with an outer size of 0.1 to 100 mm. The external size means a length twice the distance from the center (center of gravity) of the chip-shaped recording material to the vertex of the farthest corner.

  Reference numeral 2 denotes a first separation processing unit, which includes a hydrocyclone 201, a first collision type centrifugal dehydrator 202, and a draining means 203. There is no limitation in particular as the draining means 203, For example, an air cyclone, a screen conveyor, etc. are mentioned. In this figure, the case where an air cyclone is used is shown.

  Reference numeral 201a denotes a hopper that receives solids separated from the alkaline processing liquid by the hydrocyclone 201. Commercially available hydrocyclone 201, first collision type centrifugal dehydrator 202, and air cyclone 203 can be used, and the size can be appropriately selected from the processing amount.

  The first separation processing unit is a step of separating solids from the alkaline processing liquid of the previous step. The alkaline processing liquid containing the solid matter from the first chemical processing unit 1 is introduced from the upper part of the cylindrical portion 201b of the hydrocyclone 201 at a speed of 10 to 2500 m / min in the circumferential tangential direction of the hydrocyclone. Is preferred. If it is less than 10 m / min, the generation of eddy currents in the hydrocyclone main body becomes weak, and separation may not be possible depending on the state of solids in the alkaline processing liquid sent from the first chemical processing unit. When it exceeds 2500 m / min, depending on the state of solids in the alkaline processing liquid sent from the first chemical processing unit, solids may be clogged in the orifice 201 c below the hydrocyclone and separation may not be possible. .

  It is preferable to dilute the alkaline processing liquid with water so that the solid content concentration when introduced into the hydrocyclone 201 is 0.1 to 2% by mass. When the amount is less than 0.1% by mass, a large amount of water is used, which may be one of the causes of poor productivity. When the content exceeds 2% by mass, the hydrocyclone may be clogged depending on the size of the chip-shaped recording material.

  The alkaline treatment liquid introduced along the circumferential tangential direction of the hydrocyclone is separated and collected by the centrifugal force from the orifice 201c to the hopper 201a via the tapered portion 201e of the hydrocyclone 201, and the upper portion is discharged. From the outlet 201d, an alkaline treatment liquid containing a part of the peeled coating film and generated sludge or the like is discharged.

  From these solids, in order to separate and remove the coating film and sludge reattached to the support, the peeled coating film, sludge, etc., water is added from the hopper 201a to a solid content concentration of 0.1 to 50% by mass. It is adjusted and introduced from the lower part of the first collision type centrifugal dehydrator 202.

  While the solution introduced into the first collision type centrifugal dehydrator 202 moves to the upper part while colliding with each other, a part of the deposit and the peeled coating film, sludge and the like are discharged from the lower part 202a. From the upper part 202b, the support (including the support from which the coating film has been peeled off, the support from which a part of the coating film remains, and the support to which the peeled coating film and sludge are attached) cannot be separated. The peeled coating film and the like remaining on are discharged.

  The support discharged from the upper part 202b of the first collision type centrifugal dehydrator 202 (the support from which the coating film was peeled off, the support from which a part of the coating film was left, the peeled coating film, sludge, and the like adhered. In addition, the peeled coating film remaining without being separated is introduced into an air cyclone serving as a draining means, and the adhering water is removed.

  The solids collected at this stage were generated by the support from which the coating film was peeled off, the support from which a part of the coating film remained, the support from which the peeled coating film was reattached, and the alkaline processing liquid. Since the support to which sludge and the like are attached, the peeled coating film, and the sludge and the like generated by the alkaline processing liquid are mixed, it is not yet in a state where it can be reused for the support of the recording material.

  Reference numeral 3 denotes a second separation processing unit, which has a high shear stirring device 301 and a second collision type centrifugal dehydrator 302. Commercially available high shear agitator 301 and second collision type centrifugal dehydrator 302 can both be used, and the size can be appropriately selected in accordance with the processing amount.

  The second separation processing unit 3 is configured to remove the coating film and sludge by the physical force from the support to which the separated coating film and sludge and the like collected by the first separation processing unit are attached. This is a step of subdividing the membrane to facilitate removal and separating the support.

  The solid matter recovered by the first separation processing unit 2 is adjusted to a solid content concentration of 0.1 to 50% by mass with water, and is put into the high shear stirring device 301. The mechanism and processing conditions of the high shear stirring device 301 will be described with reference to FIG.

  The solid matter is processed by applying a high shearing force with the high shear stirring device 301, so that the coating film remaining on the support, the coating film adhering thereto, sludge, etc. are peeled off and simultaneously subdivided. . Similarly, the peeled coating film, sludge and the like remaining without being separated are subdivided by being treated by applying a high shearing force to form a solution mixed with water.

  In this state, the support is separated from the coating film, sludge, and the like by being introduced into the second collision type centrifugal dehydrator 302 and processed, and the support is recovered. When the support is recovered from the second collision type centrifugal dehydrator 302, the support may be recovered via an air cyclone as shown in the first separation processing unit. Since the support recovered at this stage contains a support with a small amount of coating film, sludge, etc., and a subdivided coating film, etc., it is still reused as a recording material support. It is not in a state where it can be done. The mechanism and conditions of the second collision type centrifugal dehydrator 302 will be described with reference to FIG.

  Reference numeral 4 denotes a second chemical processing unit that makes the support recovered from the second separation processing unit 3 reusable as a recording material support. 401, the support 402 collected from the second collision-type centrifugal dehydrator 302 placed in the treatment tank 401a is treated with the acidic treatment liquid 403 at a temperature of 1 to 95 ° C. with the stirrer 401b while the support is treated. A processing device is shown. By the treatment with the acidic treatment liquid, a slight coating film, sludge, and a fine coating film binder adhering to the support 402 are decomposed, and silver can be separated and removed as silver nitrate. .

  The support recovered at the stage where the treatment with the acidic processing liquid is completed has no adhesion of foreign matter, and is separated from the acidic processing liquid by the same level as the support used in the production of the recording material. It is in a state that can be reused for the support.

  The acidic treatment liquid used in the second chemical treatment section is not particularly limited, and examples thereof include nitric acid, hydrohalic acid, sulfuric acid and the like, and nitric acid and hydrohalic acid are particularly preferable. The concentration of the acidic treatment liquid is preferably 0.01 to 10 mol / L. When it is less than 0.01 mol / L, the binder of the coating film may not be decomposed depending on the type of binder, and silver may not be eluted into the solution. If it exceeds 10 mol / L, depending on the material used in the equipment, corrosion may progress and hinder production.

  Reference numeral 5 denotes a water washing / drying section. The water washing / drying unit 5 is a step of separating, washing, and drying the support treated with the acidic treatment liquid in the chemical treatment unit 4.

  Reference numeral 501 denotes a water washing apparatus, and 502 denotes a drying apparatus. The washing apparatus 501 is not particularly limited as long as the recovered support can be efficiently washed. For example, the washing apparatus 501 may be a washing tank equipped with a stirrer, or a mesh drum type container that can be rotated while the washing water is lost in the shower. But it ’s okay. When the drying is completed by the drying apparatus, the recovery of the support that can be reused as the raw material of the recording material support is completed.

  The drying device 502 is not particularly limited as long as the drying device 502 can be efficiently dried similarly to the water washing device 501, and may be, for example, a mesh drum type container that can be rotated while blowing drying air.

  It is preferable that all of the first chemical processing unit, the first separation processing unit, the second separation processing unit, the second chemical processing unit, and the water washing / drying unit shown in FIG.

  Next, the mechanism and processing conditions of the high shear stirring apparatus according to the present invention will be described.

  FIG. 2 is a schematic view of a Henschel mixer, which is a high shear stirring device of the second separation processing unit of FIG. FIG. 2A is a schematic cross-sectional view of a Henschel mixer. FIG. 2B is a schematic perspective view of the lower blade of the Henschel mixer. FIG. 2C is a schematic perspective view of the upper blade of the Henschel mixer.

  In order to recover only the support from the solids recovered in the first separation processing unit, a high shear force is applied to these, and the coating film remaining on the support, the coating film reattached to the support, and As a result of the examination, it has become clear that it is most effective to peel and remove sludge and the like and to subtract and remove the mixed coating film.

  The coating film remaining on the support is in a state in which the alkaline treatment liquid is infiltrated into the undercoat layer at the stage where the treatment with the alkaline treatment liquid has been completed, so peeling is promoted by applying a high shear force to the coating film. It is easy to be done. Moreover, peeling is promoted by applying a high shearing force to the coating film, sludge and the like adhering to the support. The peeled coating film, sludge and the like are subdivided by applying a high shearing force, and are easily separated from the support in the next step.

  A Henschel mixer (manufactured by Mitsui Mining Co., Ltd.) can be cited as an optimal apparatus that applies a high shear force evenly. In this figure, a case where a Henschel mixer is used as a high shear stirring device will be described.

  In the figure, 301a represents a bottomed cylindrical body of the Henschel mixer, and 301b represents a lid. 301c shows a rotating shaft, 301d shows the lower blade | wing attached to the rotating shaft 31c, 301e shows the upper blade | wing attached to the rotating shaft 301c. As the rotating shaft rotates (in the direction of the arrow in the figure), the liquid in the body 301a generates a flow in two directions. One is the upward flow from the bottom (in the direction of the arrow in the figure) due to the rotation of the lower blade 301d. The other is a horizontal flow (in the direction of the arrow in the figure) generated by the rotation of the upper blade 301e. When solids are present in the processing liquid, the solids are once subjected to an upward flow, and then are subjected to a downward flow and contact with the upper blade to be subjected to a shearing force. By applying a high shearing force uniformly to each solid matter by processing for a certain period of time with a Henschel mixer that generates such a flow, the coating film remaining on the support, the coating film and sludge that had adhered, When the coating film remaining without being separated is peeled off, it is shredded and subdivided to facilitate separation in the next step.

  The shape of the lower blade and the upper blade is not particularly limited, and can be appropriately selected depending on the type of the object to be stirred and the concentration of the solid material.

  Preferred conditions in the Henschel mixer 301 include the following conditions. The solid content concentration is preferably 1 to 70% by mass. When the amount is less than 1% by mass, the swirl flow in the tank becomes dominant, the axial flow is not generated, and the pulverization by the upper blade may not be possible depending on the kind of the object to be stirred and the kind of the solid substance. If it exceeds 70% by mass, depending on the type of solid matter, bridging is likely to occur and uniform stirring may not be possible.

  The rotation speed of the blade (the peripheral speed at the tip of the blade) is preferably 10 to 70 m / sec. If it is less than 20 m / sec, the shearing force applied to each solid matter becomes small, and depending on the state of the applied coating film and sludge, it may not be peeled off or the peeled coating film may not be fragmented. When it exceeds 70 m / sec, depending on the type of coating film, the temperature of the peeled coating film rises with stirring, and depending on the type of binder used in the coating film, the viscosity increases and softens and peels. The coating film may adhere to the support again, and it may be difficult to peel off the coating film that has been reattached in the subsequent steps.

  The time is preferably 10 to 30 minutes. If it is less than 10 minutes, the peeling may not be completed depending on the type of coating film and the state of adhering foreign matter. If it exceeds 30 minutes, the internal temperature rises and the viscosity increases and softens depending on the type of binder used in the coating, and the peeled coating adheres to the support again. It may be difficult to peel off the attached coating film.

  The temperature is preferably 1 to 40 ° C. When the temperature is lower than 1 ° C., depending on the type of contents, solidification may occur partially and complete flow may not be possible. When it exceeds 40 ° C., depending on the type of coating film, it may start to become viscous and reattach to the support.

  FIG. 3 is a schematic view of the second collision type centrifugal dehydrator shown in FIG. FIG. 3A is a schematic sectional view of the second collision type centrifugal dehydrator shown in FIG. FIG. 3B is a schematic plan view of a collision type centrifugal dehydrator.

  In the figure, 302a indicates a cylindrical outer cylinder of a collision type centrifugal dehydrator, and 302b indicates a rotating rotor disposed inside the outer cylinder 302a. 302c shows a cylindrical separation cylinder. Reference numeral 302d denotes a motor for driving the rotary rotor 302b. Reference numeral 302c1 denotes a hole provided in the cylindrical separation cylinder 302c. Reference numeral 302b1 denotes a stirring blade attached to the surface of the rotating rotor 302b. When the rotary rotor 302b is rotated (in the direction of the arrow in the figure), the stirring blade is fed with the processing liquid processed by the high shear stirring device inserted from the supply port 304 into the gap 303 between the separation cylinder 302c and the outside of the rotary rotor 302b. It is attached at an angle that results in upward flow. Centrifugal force is applied by rotating the rotating rotor 302b, and the coating film, sludge and treatment liquid peeled off from the support are removed from the holes provided in the separation cylinder 302c, and the support is not passed through the remaining upper portion. Is discharged and separated from the outlet 305 of the printer. The coating film and the treatment liquid mixed with the adhering material that have passed through the holes are discharged from the discharge port 306 at the lower part of the outer cylinder 302a. The size of the hole 302c1 is preferably 1/10 to 1/2 with respect to the size of the chip-shaped recording material cut into pieces. If it is less than 1/10, depending on the size of the peeled coating film and the size of the deposit, it may not be removed without passing through the hole. When the ratio exceeds 1/2, the support may be removed depending on the size of the support. Note that the size of the chip-shaped recording material that has been chopped indicates an average value obtained by measuring 100 g of the chip-shaped recording material that has been chopped and measuring the maximum length of each chip. The shape of the hole 302c1 is not particularly limited, but a circular shape is preferable from the viewpoints of cleaning the separation cylinder, maintaining strength, and making it easily.

  The aperture ratio of the holes 302c1 provided in the separation cylinder 302c (the total area of the holes / total surface area of the separation cylinder × 100) is preferably 10 to 80%. Furthermore, 30 to 60% is preferable. If it is less than 10%, depending on the concentration of solids in the treatment liquid, it may take time to separate, and work efficiency may deteriorate. If it exceeds 80%, the strength may be insufficient depending on the material of the separation cylinder, and it may take time and cost for maintenance of the separation cylinder, resulting in poor production efficiency.

  The shape of the rotating rotor 302b is not particularly limited as long as it can rotate at high speed, and may be, for example, a cylindrical shape or a polygonal cylindrical shape. This figure shows a cylindrical shape. The first collision type centrifugal dehydrator used in the first separation processing unit has the same structure as the second collision type centrifugal dehydrator shown in the figure.

  The amount of the processing liquid to be put into the collision type centrifugal dehydrator can be appropriately determined depending on the solid content concentration and the size of the collision type centrifugal dehydrator. The rotational speed (circumferential speed) of the rotating rotor is preferably 5 to 40 m / sec. In the case of less than 5 m / sec, the size of the support on which a part of the coating film in the treatment liquid remains, the peeled coating film, sludge generated by the alkaline treatment liquid treatment, and the peeled coating film are attached. Depending on the situation, solids do not roll up in the collision type centrifugal dehydrator, there is no collision between these supports, and sludge generated by the coating film and alkaline treatment liquid treatment may not be separated. If it exceeds 40 m / sec, the support is damaged by the blades of the rotor and miniaturization proceeds, so depending on the size of the hole provided in the separation cylinder, the refined support is removed and the recovery rate is greatly increased. May fall.

  FIG. 4 is a schematic view of a shredding device using a flat blade. FIG. 4A is a schematic side view of a shredding machine using a flat blade. FIG. 4B is a schematic plan view of a portion indicated by A in FIG.

  In the figure, 6 indicates a shredding device using a flat blade. The shredding device has a first shredder 601, a second shredder 602, a driving roll 603 and a transport belt 605 hung on a holding roll 604. θ1 indicates an arrangement angle of the first shredder 601 with respect to the recording material 7 on the conveyance path, and the arrangement angle θ1 is 10 to 80 °. When the angle is less than 10 °, the length of the blade becomes long, and it becomes difficult to cut uniformly in the width direction, and there is a risk of causing in-layer peeling or cracking of the support on the cut surface, which is not preferable. When the angle exceeds 80 °, the length of the blade of the second shredder becomes long, and it becomes difficult to cut uniformly in the width direction, and the peeling of the support on the cut surface within the layer, cracks, etc. occur. It is not preferable because of danger. θ2 indicates an arrangement angle of the second shredder 602 with respect to the first shredder 601 and the arrangement angle θ2 is 10 to 160 °. When the angle is less than 10 °, the length of the blade becomes long, and it becomes difficult to cut uniformly in the width direction, and there is a risk of causing in-layer peeling or cracking of the support on the cut surface, which is not preferable. If it exceeds 160 °, the blade length becomes long, it becomes difficult to cut uniformly in the width direction, and there is a risk of peeling in the layer of the support on the cut surface, cracking, etc., which is not preferable. .

  By disposing the first shredder 601 and the second shredder 602 at the positions shown in the figure, the recording material 701 is shredded by the first shredder 601 and becomes a narrow strip shape. Are shredded by the second shredder 602 to form a chip-like record 702.

  The first shredder 601 has a frame (not shown) of the shredding device 6 so that the flat blade 601a can be driven up and down by a drive mechanism (not shown) in accordance with the conveying speed of the recording material 7. Is attached. The flat blade 602a of the second shredder 602 is attached to the frame (not shown) of the shredding device 6 so that it can be driven up and down by a drive mechanism (not shown) according to the driving speed of the flat blade 601a. It has been.

The narrow strip-shaped recording material 701 is held by a holding means 606 having a suction mechanism to prevent the occurrence of displacement when the recording material 701 is placed on the conveying belt 605 and moved to the second shredder 602. .
The holding means is not particularly limited, and for example, a nip roll, a guide roll, etc. can be used. In the case of this figure, a method is shown in which a fine hole is formed in the conveying belt 605, and suction is performed between the first shredder 601 and the second shredder 601 by the holding means 606 having a suction mechanism.

  Reference numeral 8 denotes a box for storing the chip-shaped recording material 702. After a certain amount of the chip-shaped recording material 702 has accumulated in the box 8, it is sent to the first chemical processing section shown in FIG. Then, the support is recovered.

  The recording material and the shape to be cut into chips by the shredding apparatus shown in this figure may be a single sheet or may be long.

FIG. 5 is a schematic view of a flat blade used in the first shredder and the second shredder shown in FIG. FIG. 5A is a schematic plan view of a flat blade used in the first shredding machine and the second shredding machine shown in FIG. FIG. 5B is a schematic cross-sectional view of the flat blade shown in FIG. FIG. 5C is an enlarged schematic cross-sectional view of a portion indicated by B in FIG.
In the figure, 601a1 (602a1) indicates the cutting edge of the flat blade 601a (602a), and θ3 indicates the cutting edge angle of the flat blade 601 (602). The blade edge angle θ3 is preferably 5 to 80 °. If the angle is less than 5 °, the accuracy of the cutting edge is difficult to obtain, the blade is likely to spill, and if the management of the blade is inadequate, the cut surface may be cracked and the support may be peeled off. When the angle exceeds 80 °, the cutting resistance applied to the blade is increased, and there are cases where cracks occur on the cut surface, and delamination of the support occurs.

  J indicates the width of the edge of the edge of the flat blade 601a (602a). The width J of the cutting edge ridge line is preferably 0.001 to 3.0 mm. When the thickness is less than 0.001 mm, accuracy is difficult to obtain, the blade is easily spilled, and when the blade management is inadequate, the cut surface may be cracked and the support may be peeled off. When the thickness exceeds 3.0 mm, the cutting resistance applied to the blade increases, and there are cases where cracks occur on the cut surface, and delamination of the support occurs.

  The flat blade 601a (602a) may be either double-edged or single-edged, and in the case of this figure, the case of a single-edged blade is shown. When the recording material is shredded with the flat blade shown in this figure, the lowering angle of the flat blade is preferably 0.1 to 70 °. When the angle is less than 0.1 °, the shredding property is deteriorated and the shearing force applied to the shredded portion at the time of shredding increases, so that the cut surface may be cracked and delamination may occur depending on the type of recording material. When the angle exceeds 70 °, the shredding property is deteriorated and the shearing force applied to the shredding portion at the time of shredding increases, so that depending on the type of the recording material, the cut surface may be cracked and delamination may occur. The downward angle refers to an angle formed between the vertical direction and the direction in which the flat blade descends while maintaining the blade edge of the flat blade parallel to the recording material.

  When producing an irregular chip-shaped recording material having an outer size of 0.1 to 100 mm using the cutting blade shown in FIG. 4 with the blade-shaped flat blade, the shearing force applied to the recording material is reduced. As a result, it is possible to obtain a high-quality chip that does not crack in the peripheral edge of the chip and does not break the support within the layer.

  FIG. 6 is a schematic view of a shredding device using a die cut slit roll and a cross cut roll. FIG. 6A is a schematic perspective view of a shredding device using a die-cut slit roll as the first shredder and a cross-cut roll as the second shredder. FIG. 6B is a schematic cross-sectional view of the cutting blade of the die-cut slit roll shown in FIG. FIG. 6C is an enlarged schematic cross-sectional view of a portion indicated by C in FIG. FIG. 6D is a schematic cross-sectional view of the cutting blade of the cross-cut roll shown in FIG. FIG. 6E is an enlarged schematic cross-sectional view of a portion indicated by D in FIG.

  In the drawing, 9 has a die-cut slit roll 901 as a first shredder and a cross-cut roll 902 as a second shredder, and is arranged so that its axis is perpendicular to the recording material 7 on the conveyance path. Shows a shredding device. Reference numeral 903 denotes a backing roll which is a receiving roll for the die-cut slit roll 901. The distance between the cutting blade 901a of the die-cut slit roll 901 and the surface of the backing roll 903 is adjusted so that the cutting blade 901a cuts the support of the recording material 7 exactly, and the cutting blade 901a is placed on the surface of the backing roll 903. It is designed not to bite.

  Reference numeral 901b denotes a rotating shaft of the die-cut slit roll 901, which is connected to a drive mechanism (not shown). Reference numeral 903a denotes a rotating shaft of the backing roll 903, which is connected to a drive mechanism (not shown).

  The die-cut slit roll 901 can be rotated (in the direction of the arrow in the figure) by a drive mechanism (not shown) in the direction opposite to the conveyance direction (the direction of the arrow in the figure) of the recording material 7 on the conveyance path, and the backing roll 903. Is attached to the frame (not shown) of the shredding device so as to be rotatable (in the direction of the arrow in the figure) by a drive mechanism (not shown) in the opposite direction to the die cut slit roll 901.

  Examples of the material of the backing roll 903 include iron, stainless steel, aluminum, nylon resin, Teflon (R) resin, PET, and the like.

  The number of cutting blades disposed on the die-cut slit roll 901 can be adjusted to the size of the chip to be produced. The die-cut slit roll 901 can be produced by carving a blade on the roll surface with an NC machine or the like.

  The cross cut roll 902 is disposed in parallel to the die cut slit roll 901, and at least one cutting blade 902 a is attached to the surface in parallel to the die cut slit roll 901. Reference numeral 902b denotes a rotation axis of the cross cut roll 902, which is connected to a drive mechanism (not shown).

  The distance between the cutting blade 902a of the cross-cut roll 902 and the surface of the backing roll 904 is adjusted so that the cutting blade 902a cuts the support of the recording material 7 exactly, and the cutting blade 902a has the backing roll 904. It is designed not to bite into the surface. The cutting blade 902a is attached to the surface of the cross cut roll 902.

  Reference numeral 904a denotes a rotating shaft of the backing roll 904, which is connected to a drive mechanism (not shown).

  Examples of the material of the backing roll 904 include iron, stainless steel, aluminum, nylon resin, Teflon (R) resin, PET, and the like.

  The number of cutting blades disposed on the cross cut roll 902 can be adjusted to the size of the chip to be produced. The cross cut roll 902 can be manufactured by embedding and attaching a cutting blade to the surface of the roll as necessary.

  The cross cut roll 902 can be rotated (in the direction of the arrow in the figure) by a drive mechanism (not shown) in the direction opposite to the conveyance direction of the slit-shaped recording material 7 (in the direction of the arrow in the figure), and the backing roll 904. Is attached to a frame (not shown) of the shredding device so that it can be rotated (in the direction of the arrow in the figure) by a drive mechanism (not shown) in the opposite direction to the cross cut roll 902.

  Reference numeral 905 denotes a conveyance mechanism for the narrow strip-shaped recording material 701 cut by the die cut slit roll 901. The conveyance mechanism 905 includes a conveyance belt 905a that conveys a narrow strip-shaped recording material 701 cut by the die-cut slit roll 901, a drive roll 905b for the conveyance belt, a holding roll 905c, and a narrow strip-shaped recording material. And holding means 905d having a suction mechanism in order to prevent the occurrence of positional deviation 701. The conveying belt 905a has fine holes for suction.

  The holding means is not particularly limited, and for example, a nip roll, a guide roll, etc. can be used.

  Note that the distance between the die-cut slit roll 901 and the cross-cut roll 902 is not particularly limited, and may be described for the purpose of this figure, or may be close to the extent that the die-cut slit roll 901 and the cross-cut roll 902 do not collide with each other. It doesn't matter.

  θ4 indicates the edge angle of the cutting blade 901a. The blade edge angle θ4 is preferably 5 to 90 °. If the angle is less than 5 °, the accuracy of the cutting edge is difficult to obtain, the blade is likely to spill, and if the management of the blade is inadequate, the cut surface may be cracked and the support may be peeled off. When the angle exceeds 90 °, the cutting resistance applied to the blade is increased, and there are cases where cracks occur on the cut surface, and delamination of the support occurs.

  K indicates the width of the edge of the cutting edge of the cutting blade 901a. The width K of the cutting edge ridge line is preferably 0.01 to 3.0 mm. When the thickness is less than 0.001 mm, accuracy is difficult to obtain, the blade is easily spilled, and when the blade management is inadequate, the cut surface may be cracked and the support may be peeled off. When the thickness exceeds 3.0 mm, the cutting resistance applied to the blade increases, and there are cases where cracks occur on the cut surface, and delamination of the support occurs.

  The cutting blade 901a may be either a double-edged blade or a single-edged blade, and the case of this figure shows the case of a single-edged blade.

  M indicates the height of the cutting blade 901a, and the height M is preferably 0.01 to 10 mm. When the thickness is less than 0.01 mm, cutting failure may occur depending on the type of recording material, cracks may occur on the cut surface, and in-layer peeling of the support may occur. If it exceeds 10 mm, the cutting blade mounting part will be easily bent and it will be difficult to form a vertical cut surface. Depending on the type of recording material, the shearing force will increase during cutting, and the cut surface will be cracked. In-layer peeling may occur.

  θ5 indicates the edge angle of the cutting blade 902a. The blade edge angle θ5 is preferably 5 to 90 °. If the angle is less than 5 °, the accuracy of the cutting edge is difficult to obtain, the blade is likely to spill, and if the management of the blade is inadequate, the cut surface may be cracked and the support may be peeled off. When the angle exceeds 90 °, the cutting resistance applied to the blade is increased, and there are cases where cracks occur on the cut surface, and delamination of the support occurs.

  L indicates the width of the edge of the cutting edge of the cutting blade 902a. The width L of the cutting edge ridge line is preferably 0.01 to 3.0 mm. When the thickness is less than 0.001 mm, accuracy is difficult to obtain, the blade is easily spilled, and when the blade management is inadequate, the cut surface may be cracked and the support may be peeled off. When the thickness exceeds 3.0 mm, the cutting resistance applied to the blade increases, and there are cases where cracks occur on the cut surface, and delamination of the support occurs.

  The cutting blade 902a may be either a double-edged blade or a single-edged blade, and the case of this figure shows the case of a single-edged blade.

  N indicates the height of the cutting blade 902a, and the height N is preferably 0.01 to 10 mm. When the thickness is less than 0.01 mm, cutting failure may occur depending on the type of recording material, cracks may occur on the cut surface, and in-layer peeling of the support may occur. If it exceeds 10 mm, the cutting blade mounting part will be easily bent and it will be difficult to form a vertical cut surface. Depending on the type of recording material, the shearing force will increase during cutting, and the cut surface will be cracked. In-layer peeling may occur.

  As shown in this figure, by disposing a die-cut slit roll 901 and a cross-cut roll 902, the recording material 7 is cut into a slit shape with the die-cut slit roll 901 and cut into a chip shape with the cross-cut roll 902. A chip-shaped recording material 702 can be obtained. The obtained chip-shaped recording material 702 is stored in the box 8, and after a certain amount is stored, it is processed with an alkaline processing liquid by the processing apparatus shown in FIG. 1, and the support is recovered.

The shearing force applied to the recording material when an irregular chip-shaped recording material having an outer size of 0.1 to 100 mm is produced by the cutting tool using the blade-shaped die-cut slit roll and the cross-cut roll shown in FIG. It is possible to obtain a good quality chip that does not crack the peripheral edge of the chip and does not break the support within the layer.
FIG. 7 is a schematic view of a shredding device using a slitter having an upper blade and a lower blade and a cross cut roll.

  In the figure, reference numeral 10 denotes a slitter 10A having a roll 10a with an upper blade and a roll 10b with a lower blade in a first shredding machine, and a cross-cut roll 10c in a second shredding machine, and a recording material 7 on the conveying path. Shows a shredding device arranged so that its axis is at right angles. Reference numeral 10a1 denotes an upper blade, and reference numeral 10a2 denotes a rotating shaft to which the upper blade 10a1 is attached. The number of the upper blades 10a1 attached can be changed depending on the size of the chip-shaped recording material 702, and the upper blades 10a1 to be attached all have the same shape, and FIG. 10b1 shows the rotating shaft which rotates the roll 10b with a lower blade, and is connected with the drive mechanism (not shown).

  The roll 10a with the upper blade rotates in the direction opposite to the conveying direction of the recording material 7 (the direction of the arrow in the figure), and the roll 10b with the lower blade rotates in the direction opposite to the roll 10a with the upper blade by a drive mechanism (not shown) ( It is attached to a frame (not shown) of the shredding device so as to (in the direction of the arrow in the figure).

  Reference numeral 10c denotes a cross cut roll disposed in parallel to the slitter 10A, and at least one cutting blade 10c1 is attached to the surface in parallel to the slitter 10A. In the case of this figure, the case where 10 cutting blades are attached is shown. Reference numeral 10c2 denotes an attachment shaft for the cross cut roll 10c, which is connected to a drive mechanism (not shown).

  The interval between the cutting blade 10c1 of the cross-cut roll 10c and the surface of the backing roll 10d is adjusted so that the cutting blade 10c1 cuts the support of the slit-shaped recording material 7 and the cutting blade 10c1 is backed by the backing roll 10d. It is designed not to bite into the surface.

  As the material of the backing roll 10d, the same material as the backing roll shown in FIG. 6 can be used.

  The number of cutting blades 10c1 disposed on the cross cut roll 10c can be adjusted to the size of the chip to be produced. The cross cut roll 10c can be manufactured by embedding and attaching a cutting blade to the surface of the roll as necessary. The cutting edge angle of the cutting blade 10c1 of the cross cut roll 10c and the width of the cutting edge ridge line can be the same as the cutting edge angle and the width of the cutting edge ridge line of the cutting blade of the cross cut roll shown in FIG.

  The cross cut roll 10c can be rotated (in the direction of the arrow in the figure) by a drive mechanism (not shown) in the direction opposite to the conveying direction of the slit-shaped recording material 7 (in the direction of the arrow in the figure), and the backing roll 10d. Is attached to a frame (not shown) of the shredding device so as to be rotatable (in the direction of the arrow in the figure) by a drive mechanism (not shown) in the opposite direction to the cross cut roll 10c.

  Reference numeral 11 denotes a transport mechanism for a narrow strip-shaped recording material 701 cut into a narrow width by the slitter 10A. The transport mechanism 11 includes a transport belt 11a that transports a narrow strip-shaped recording material 701 cut into a narrow width by the slitter 10A, a transport roll drive roll 11b, a holding roll 11c, and a narrow strip-shaped recording. In order to prevent the positional deviation of the material 701, the holding means 11d having a suction mechanism is provided. The conveying belt 11a has fine holes for suction.

  The holding means is not particularly limited, and for example, a nip roll, a guide roll, etc. can be used.

  In addition, the space | interval of the slitter 10A and the crosscut roll 10c does not have limitation in particular, You may talk for the purpose of this figure, and you may make it approach to such an extent that the slitter 10A and the crosscut roll 10c do not collide.

  FIG. 8 is an enlarged schematic perspective view showing the relationship between the upper and lower blades indicated by E in FIG. However, the recording material is removed for easy understanding of the relationship between the upper blade and the lower blade. In the figure, 10b2 represents a lower blade attached to the attachment member 10b3 in a ring shape, 10b4 represents a spacer member for determining a cutting width, 10b5 represents an upper blade 10a1 provided between the attachment member 10b3 and the spacer member 10b4. Shows the escape area. The arrows indicate the rotation directions of the upper blade 10a1 and the lower blade 10b2.

  The peripheral speed ratio of the upper blade is preferably increased by 0 to 10% with respect to the feeding speed of the recording material. If it is less than 0% (slower than the feeding speed of the recording material), depending on the type of the recording material, cutting may be defective, and cracks on the cut surface, peeling of the support in the layer, and the like may occur. If it exceeds 10%, depending on the type of recording material, it becomes an upper blade, and the cut surface may be rubbed to cause cracks, peeling of the support within the layer, and the like.

  In this manner, by taking the peripheral speed ratio of the upper blade with respect to the feeding speed of the recording material 7, it is possible to prevent the coating film from being peeled off from the cut surface.

  The peripheral speed ratio of the lower blade is preferably controlled to be 1.0 to 1.1 with respect to the feeding speed of the wide belt-shaped photosensitive material 1. If the ratio is less than 1.0, the recording material 7 may be bent during conveyance, and may easily come into contact with the apparatus, which may increase the risk of scratching. If it exceeds 1.1, rubbing by the blade may occur, and the support surface may be scratched.

  In the present invention, the peripheral speed ratio is a ratio represented by the following calculation formula.

Peripheral speed ratio of upper blade = peripheral speed of upper blade / feeding speed of recording material, peripheral speed ratio of lower blade = peripheral speed of lower blade / feeding speed of recording material FIG. 9 is shown in FIG. FIG. In the figure, θ6 represents the edge angle of the upper blade 10a1, and is preferably 30 to 90 degrees, more preferably 75 to 90 degrees. When the angle is less than 30 degrees, the cutting edge is liable to be broken and the durability is not preferable. When the angle exceeds 90 degrees, the sharpness is decreased, which is not preferable. θ7 indicates the edge angle of the lower blade 10b2, and is preferably 70 to 90 degrees. If the angle is less than 70 degrees, the upper blade 10a1 may be unevenly worn, which is not preferable. If the angle exceeds 90 degrees, the contact between the upper blade 10a1 and the lower blade 10b2 becomes insufficient, and the upper blade 10a1 becomes the lower blade 10b2. It is not preferable because there is a possibility that it is off.

  It is preferable to use the upper blade and the lower blade in combination so that the difference in blade edge angle between the upper blade and the lower blade is 0 to 15 °, more preferably 0 to 5 °.

  When the angle exceeds 15 °, shearing (biting) into the material to be shredded proceeds from the sharp blade side, and the break point may deviate from the center.

  X represents the overlapping amount of the upper blade 10a1 and the lower blade 10b2, and is preferably 0.1 to 1.0 mm, more preferably 0.2 to 0.5 mm. If it is less than 0.1 mm, there is a risk that the upper blade will come off the escape portion 10b5 and ride on the lower blade. When the thickness exceeds 1.0 mm, the sharpness is poor, and the cut surface may be damaged depending on the type of the recording material.

  Y indicates the depth of the escape portion 405 and is 5.0 to 10 mm. Z indicates the width of the escape portion 405, which is 1.5 to 3.0 mm.

The shearing force applied to the recording material is reduced when the chip-shaped recording material is produced by the upper and lower blades shown in FIGS. 8 and 9 and the shredding device shown in FIG. 7 using a cross-cut roll. As a result, it is possible to obtain a good quality chip without cracking at the peripheral edge of the chip and without causing in-layer destruction of the support.
The chip-shaped recording material to be shredded by the shredding machine shown in FIGS. 4 to 9 is preferably indeterminate with an outer size of 0.1 to 100 mm. It is preferable that the external size is an indefinite shape having a size of 0.1 to 100 mm. If the thickness is less than 0.1 mm, the shearing force applied to the recording material during shredding increases, and depending on the type of recording material, fine cracks, cracks, and in-layer fracture of the support may occur at the periphery of the obtained chip-shaped recording material. May occur. Further, depending on the thickness of each liquid feeding pipe in the recovery method shown in FIG. 1, there is a risk of clogging the liquid feeding pipe. Similarly, when the length exceeds 100 mm, there is a risk of clogging of the liquid feeding pipe depending on the thickness of each liquid feeding pipe of the recovery method shown in FIG. In addition, stirring may not be sufficiently performed by alkali treatment, and a coating film may remain.

  4 to 9, the recording material is shredded into chips by using the polyester resin as a support, and the following effects can be obtained by recovering the support by the recovery method shown in FIGS. 1 to 3. Can be mentioned.

  1) Even with an irregular chip having an outer size of 0.1 to 100 mm, it is possible to obtain a high-quality chip that does not crack in the peripheral edge of the chip and does not cause in-layer destruction of the support.

  2) By making the chip smaller, the stirring efficiency in the treatment with the alkaline processing liquid is improved, the coating film can be separated efficiently, the high-purity support can be efficiently recovered, and for recording materials (especially purity) In particular, it can be reused as a raw material for a support for a photographic light-sensitive material.

  3) Along with the fact that it can be reused, the need for incineration or landfilling is eliminated and the environmental burden is eliminated.

  The support according to the present invention is not particularly limited. For example, JP 2000-206646, 2001-290243, 2002-99063, 2002-116320, 2002-131872, 2002-250990, 2003-1774, etc. The thing of description is mentioned.

  The recording material using the support according to the present invention can be any recording material in which a coating film is formed using a natural polymer binder and a synthetic polymer binder. Examples of the photographic light-sensitive material using a natural polymer binder include medical, printing, and general silver halide photographic light-sensitive materials. Examples of the recording material using the synthetic polymer binder include a photothermographic material and a radiation image conversion sheet. In particular, JP-A-9-292671, JP-A-9-304870, JP-A-9-304871, JP-A-9-304882, JP-A-10-31282, JP-A-10-62898, JP-A-11-295844, and JP-A-11 The photothermographic material disclosed in Japanese Patent No. -352627 is preferred.

  In the present invention, examples of the transparent or translucent natural polymer and synthetic polymer binder used for the coating film formed on the support include the following. Examples of natural polymer binders include: gelatin, gum arabic, casein, starch and the like. Examples of synthetic polymer binders include: polyvinyl alcohol, hydroxyethyl cellulose, cellulose acetate, cellulose acetate butyrate, polyvinyl pyrrolidone, polyacrylic acid, polymethyl methacrylic acid, polyvinyl chloride, polymethacrylic acid, styrene-maleic anhydride copolymer Styrene-acrylonitrile copolymer, styrene-butadiene copolymer, polyvinyl acetals (for example, polyvinyl formal and polyvinyl butyral), polyesters, polyurethanes, phenoxy resins, polyvinylidene chloride, polyepoxides, polycarbonates, polyvinyl acetate, Cellulose esters and polyamides are widely used.

  As a binder used for a coating film, any of a hydrophobic resin and a hydrophilic resin may be used, and they are properly used according to their suitability.

  Preferable hydrophobic resins include polyvinyl butyral resin, cellulose acetate resin, cellulose acetate butyrate resin, polyester resin, polycarbonate resin, polyacrylic resin, polyurethane resin, and vinyl chloride resin.

  Hereinafter, although an example is given and the concrete effect of the present invention is shown, the mode of the present invention is not limited to this.

Example 1
(Preparation of recording material)
As a recording material, a half-cut size of SD-P (photothermographic material) manufactured by Konica Minolta MG Co., Ltd. was used. The thickness of the support is 200 μm.

(Preparation of shredding device)
As shown in FIG. 4, a shredding device was prepared in which the arrangement angles of the first shredding machine and the second shredding machine were changed as shown in Table 1, and designated 1-1 to 1-14. The flat blade used in the first shredder and the second shredder has the shape of a flat blade shown in FIG. 5 and has a blade edge angle of 80 °, a blade edge line width of 1 mm, and a length of 20 cm.

(Production of chip-shaped recording material)
Using each prepared shredding device, 100 kg of the half-cut size of SD-P prepared by Konica Minolta MG Co., Ltd. was shredded into a square size of 10 mm × 10 mm (outer size 14 mm) and chip-shaped. SD-P was prepared and shown in Table 2 as A-1 to N-1. As the shredding conditions, the SD-P feeding speed was 50 m / min, the shredding speed of the first shredding machine and the second shredding machine was 50 m / min, and the lowering angle was 45 °.

<Recovery of support>
Processing was sequentially performed according to the method shown in FIG.

(Treatment with alkaline treatment liquid)
The total amount of the prepared chip-shaped SD-P and A-1 is mixed with 100 L of a sodium hydroxide solution having a concentration of 1 mol / L, and stirred at a rotating speed (peripheral speed) of 5 m / sec at a stirring blade at a temperature of 90 ° C. for 1 hour. It processed and peeled the coating film. In addition, the used stirring blade is 2 sheets whose diameter when rotated is 0.5 with respect to the inner diameter of the treatment tank, and whose height from the bottom surface of the treatment tank is 0.5 with respect to the depth of the bathtub. Feathers were used.

(Recovery of support from treated alkaline treatment liquid)
Each treated alkaline treatment liquid was treated with a first separation part, a second separation part, an acidic treatment liquid, washed with water, and dried as shown in FIG.
Chip-like SD-P and B-1 to L-1 were processed under the same conditions for producing the sample 101, and the support was recovered to obtain samples 102 to 114.

<Separation process by the first separation unit>
(Separation by hydrocyclone)
The hydrocyclone shown in FIG. 1 was used to separate solids from the treated alkaline processing liquid. The hydrocyclone used has a cylindrical part length of 0.45 m, a cylindrical part inner diameter of 0.3 m, a conical part length of 0.45 m, a conical part taper degree of 15%, and an orifice inner diameter of 5 cm. Thus, the treated alkaline treatment liquid was introduced into the hydrocyclone in the circumferential tangential direction at a flow rate of 100 m / min.
(Separation by the first collision type centrifugal dehydrator)
From the lower part of the first collision type centrifugal dehydrator shown in FIGS. 1 and 3, water is further added to the solid matter separated from each treated alkaline treatment liquid by the hydrocyclone to adjust the solid content concentration to 50 mass%. The mixed solution was introduced at a flow rate of 5 m / min to separate a part of the unnecessary matter. The first impingement type centrifugal dehydrator used has an outer cylinder diameter of 0.4 m, a height of 1.5 m, and a rotating rotor with a diameter of 0.3 m and a diameter of 1.5 m. ) Was performed at 15 m / sec. The separation cylinder has a circular hole with a diameter of 2 mm (1/5 with respect to the size (average value) of the chip-like SD-P) arranged in a zigzag pattern at intervals of 3 mm, and has an opening rate of 40%. used.
(Separation of moisture and other deposits by air cyclone)
From the upper part of the first collision type centrifugal dehydrator, the solid matter separated from each treated alkaline treatment liquid and discharged was separated by air cyclone from the adhering moisture and other deposits.

<Separation of coating film, sludge, etc. from solids by the second separation processing unit>
In order to remove the coating film remaining on the support, the adhering sludge and coating film, the separated coating film remaining without separation, and the like from the solid separated by the first separation processing unit. The process by the 2nd separation process part shown by 1 was performed.

(Mixing with high shear stirrer)
A Henschel mixer (FM20C / L manufactured by Mitsui Mining Co., Ltd., the upper blade is Yi blade, and the lower blade is So blade) was used as the high shear stirring device. In order to process the separated solid matter using the Henschel mixer shown in FIGS. 1 and 2, water was added to adjust the solid concentration to 50% by mass. The treatment liquid thus prepared was treated with a Henschel mixer at a blade rotation speed (peripheral speed at the tip of the blade) of 40 m / sec and a temperature of 30 ° C. for 10 minutes.
(Separation by the second collision type centrifugal dehydrator)
The mixed solution mixed by the Henschel mixer is introduced from the lower part of the second collision type centrifugal dehydrator shown in FIGS. 1 and 3 at a flow rate of 5 m / min to separate the support from the solid matter. It was. The second collision-type centrifugal dehydrator used was the same as the first collision-type centrifugal dehydrator and was processed under the same conditions.

(Treatment with acidic solution)
In order to remove foreign matter from the solid matter (support) separated by the second collision type centrifugal dehydrator, it was treated with a 5 mol / L nitric acid solution at a temperature of 50 ° C. for 60 minutes, followed by washing with water and drying. It was.

(Evaluation)
The obtained samples 101 to 114 are subjected to molecular weight measurement, coloring degree measurement, and foreign matter adhesion observation, and the results of evaluation according to the following evaluation rank are shown in Table 3. The molecular weight was measured using a viscosity measuring device SS-270LC-1 manufactured by Shibayama Scientific Machinery Co., Ltd. and converted from the obtained viscosity. For the coloring degree measurement, each sample was used, and a 0.5 mm thick plate was prepared using an injection molding machine AU3E manufactured by Nissei Plastic Industry Co., Ltd. Each plate was measured using a spectrophotometer U-3210 manufactured by Hitachi, Ltd.

Evaluation rank of molecular weight ○: Difference from the reference sample is less than 10% Δ: Difference from the reference sample is less than 10 to 30% ×: Difference from the reference sample is 30% or more Note that the reference sample used for the evaluation is immediately after film formation The support was used.

Evaluation rank of coloring degree ○: The difference with respect to the reference sample is less than 3% △: The difference with respect to the reference sample is less than 3-5% ×: The difference with respect to the reference sample is 5% or more Immediately after the support was chopped, a product with a 0.5 mm thick plate was used using an injection molding machine AU3E manufactured by Nissei Plastic Industry Co., Ltd. in the same manner as each sample.

Observation of foreign matter adhesion 10 g of each sample 101 to 114 was arbitrarily sampled, and the presence or absence of foreign matter was visually confirmed.

Evaluation rank of foreign matter adhesion ○: No foreign matter adhesion is observed on all collected supports Δ: One to four foreign matters having a diameter of about 0.1 mm are attached to one collected support ×: Five or more foreign matters having a diameter of about 0.1 mm are attached to one recovered support.

  From the above results, it was confirmed that a support having the same purity as that of PET before use was recovered, and the effectiveness of the present invention was confirmed.

Example 2
(Preparation of photographic material)
A half-cut size of SD-P manufactured by Konica Minolta MG Co., Ltd. was used as the photothermographic material. The thickness of the support is 200 μm.

(Preparation of flat blade)
As shown in Table 4, flat blades shown in FIG. 5 having different blade edge angles and blade edge ridge lines were produced and designated as 2-1 to 2-11.

(Preparation of shredding device)
The shredding device No. 1 prepared in Example 1 was used. 1-11 flat blades were used instead of the flat blades 2-1 to 2-11 shown in Table 4. In addition, the 1st shredder and the 2nd shredder used the same flat blade.

(Production of chip-shaped recording material)
The shredding device No. 1 prepared in Example 1 was used. The flat blade of 1-11 was used in place of the flat blades 2-1 to 2-11 shown in Table 4, and the prepared half-cut size 100 kg of SD-P manufactured by Konica Minolta MG Co., Ltd. is shown in Table 5. The lowering angle was changed, and the whole amount was shredded into a square size of 10 mm × 10 mm to produce chip-shaped SD-P, which are shown in Table 5 as A-2 to K-2. In addition, the 1st shredder and the 2nd shredder used the same flat blade.

<Recovery of support>
Chip-shaped SD-P and A-2 to L-2 prepared under the same method and the same conditions as in Example 1 were processed to recover the support, and samples 202 to 211 were obtained.

(Evaluation)
Table 6 shows the results obtained by attaching the obtained samples 201 to 211 to molecular weight measurement, coloring degree measurement, and foreign matter adhesion observation in the same manner as in Example 1 and evaluating according to the same evaluation rank as in Example 1.

  From the above results, it was confirmed that a support having the same purity as that of PET before use was recovered, and the effectiveness of the present invention was confirmed.

Example 3
(Preparation of photographic material)
A half-cut size of SD-P manufactured by Konica Minolta MG Co., Ltd. was used as the photothermographic material. The thickness of the support is 200 μm.

(Preparation of die cut slit roll)
As shown in Table 7, die cut slit rolls were manufactured as 3-1 to 3-12 as the first shredder shown in FIG. 6 in which the blade edge angle and the width of the blade edge line were changed. The die-cut slit roll was prepared by arranging a cutting blade on the roll so that the slit width was 10 mm. The outer diameter of the die cut slit roll was 200 mm, and the height of the cutting blade was 0.5 mm.

(Preparation of cross cut roll)
As shown in Table 8, a cross cut roll was produced as a second shredding machine shown in FIG. 6 in which the blade edge angle and the width of the blade edge line were changed to 3-13 to 3-24. The cross cut roll was prepared by arranging a cutting blade on the roll so that the size of the chip was a square of 10 mm × 10 mm (outer size 14 mm). The outer diameter of the cross cut roll was 200 mm, and the height of the cutting blade was 0.5 mm.

(Preparation of shredding device)
The prepared die cut slit rolls 3-1 to 3-12 and the cross cut rolls 3-13 to 3-24 are combined and arranged as shown in FIG. Show. A backing roll having a diameter of 200 mm and made of stainless steel was used.

(Production of chip-shaped recording material)
Using each of the prepared shredding machines a to w, the prepared Konica Minolta MG Co., Ltd. SD-P 100 kg half-cut size is shredded into a square size of 10 mm x 10 mm (outer size 14 mm). Table 10 shows chip-shaped SD-P as preparations a-3 to w-3.

<Recovery of support>
Chip-like SD-P and a-3 to t-3 produced under the same method and the same conditions as in Example 1 were treated and the support was recovered, and used as samples a01 to w03.

(Evaluation)
Table 11 shows the results obtained by attaching the obtained samples 301 to 323 to molecular weight measurement, coloring degree measurement, and foreign matter adhesion observation by the same method as in Example 1 and evaluating according to the same evaluation rank as in Example 1.

  From the above results, it was confirmed that a support having the same purity as that of PET before use was recovered, and the effectiveness of the present invention was confirmed.

Example 4
(Preparation of photographic material)
A half-cut size of SD-P manufactured by Konica Minolta MG Co., Ltd. was used as the photothermographic material. The thickness of the support is 200 μm.
(Preparation of slitter)
As shown in Table 12, a slitter having an upper blade and a lower blade was produced as the first shredding machine shown in FIG. 7 in which the blade edge angle of the upper blade, the width of the blade edge, and the blade edge angle of the lower blade were changed. It was set to -4-10. The slitter was prepared by arranging a disk-shaped upper blade on the rotating shaft so that the slit width was 10 mm. The outer diameter of the upper blade including the rotating shaft was 150 mm.

(Preparation of cross cut roll)
As shown in Table 13, a cross cut roll was produced as a second shredding machine shown in FIG. 7 in which the blade edge angle and the width of the blade edge line were changed to 4-11 to 4-22. The cross cut roll was prepared by arranging a cutting blade on the roll so that the size of the chip was a square of 10 mm × 10 mm (outer size 14 mm). The outer diameter of the cross cut roll was 200 mm, and the height of the cutting blade was 0.5 mm.

(Preparation of shredding device)
The prepared slitters 4-1 to 4-10 and the cross cut rolls 4-11 to 4-22 are combined and arranged as shown in FIG. 7, and a shredding device is prepared and shown in Table 14 as A to U. A backing roll having a diameter of 200 mm and made of stainless steel was used.

(Production of chip-shaped recording material)
Using each of the prepared shredding machines A to U, the prepared Konica Minolta MG SD-P 100 kg half-cut size is shredded into a square size of 10 mm x 10 mm (outer size 14 mm). Chip-shaped SD-Ps are shown in Table 15 as production A-4 to U-4.

  The peripheral speed ratio of the upper blade of the slitter was the same as the feeding speed of the recording material 7, and the peripheral speed ratio of the lower blade was 45% of the feeding speed of the recording material 7. The amount of overlap between the upper and lower blades of the slitter was 0.1 mm, the depth of the escape portion was 7 mm, and the escape portion width was 2.5 mm.

<Recovery of support>
The produced chip-shaped SD-Ps, A-4 to U-4 were treated in the same manner and under the same conditions as in Example 1, and the support was collected to obtain A04 to U04 as samples.

(Evaluation)
Table 16 shows the results obtained by attaching the obtained samples A04 to U04 to the molecular weight measurement, the coloring degree measurement, and the foreign matter adhesion observation in the same manner as in Example 1 and according to the same evaluation rank as in Example 1.

  From the above results, it was confirmed that a support having the same purity as that of PET before use was recovered, and the effectiveness of the present invention was confirmed.

Example 5
When producing the chip-shaped SD-P, K04 of Example 1, the chip-shaped SD-P having different outer sizes shown in Table 17 was produced by changing the number of cutting blades attached to the cross-cut roll. It was set to 1-5-8.

<Recovery of support>
The produced chip-shaped SD-Ps 5-1 to 5-8 were treated in the same manner and under the same conditions as in Example 1, and the support was collected to obtain samples 501 to 508.

(Evaluation)
Table 18 shows the results obtained by attaching the obtained samples 501 to 508 to the molecular weight measurement, the coloring degree measurement, and the foreign matter adhesion observation by the same method as in Example 1 and evaluating according to the same evaluation rank as in Example 1.

  From the above results, it was confirmed that a support having the same purity as that of PET before use was recovered, and the effectiveness of the present invention was confirmed.

It is a schematic diagram which shows an example of the collection | recovery method of a support body. It is the schematic of the Henschel mixer which is a high shear stirring apparatus of the 2nd separation process part of FIG. It is the schematic of the 2nd collision type centrifugal dehydrator shown in FIG. It is the schematic of the shredding apparatus using a flat blade. It is the schematic of the flat blade currently used for the 1st shredder shown in FIG. 4, and the 2nd shredder. It is a schematic diagram of a shredding device using a die cut slit roll and a cross cut roll. It is the schematic of the shredding apparatus using the slitter which has an upper blade and a lower blade, and a crosscut roll. It is an expansion schematic perspective view which shows the relationship between the upper blade of the part shown by E of FIG. 7, and a lower blade. It is a schematic sectional drawing in alignment with FF 'of FIG. It is a schematic sectional drawing of a photographic photosensitive material.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st chemical processing part 101,401 processing apparatus 2 1st separation processing part 201 Hydrocyclone 202 1st collision type centrifugal dehydrator 3 2nd separation processing part 301 High shear stirring apparatus 302 2nd collision type centrifugal dehydrator 4 2nd Chemical treatment section 5 Water washing / drying section 501 Water washing apparatus 502 Drying apparatus 6, 9, 10 Shredding apparatus 601 First shredder 601a, 602a Flat blade 602 Second shredder θ1, θ2 Arrangement angle θ3-θ7 Cutting edge angle 7 Recording material 702 Chip-shaped recording material 901 Die cut slit roll 902, 10c Cross cut roll 903, 904, 10d Backing roll 905, 11 Conveying mechanism 10A Slitter 10a1 Upper blade 10b2 Lower blade

Claims (9)

A polyester-based material in which a recording material having at least one coating film on a polyester-based resin support is treated with an alkaline processing liquid, the coating film is peeled off from the polyester-based resin support, and then the polyester-based resin support is recovered. In the resin support recovery method,
The recording material has a first shredder disposed at 10 to 80 ° with respect to the recording material on the conveyance path, and a second shredder disposed at 10 to 160 ° with respect to the first shredder. A polyester-based resin support recovery method, comprising: cutting into chips using a shredding device having a machine. The first shredder and the second shredder are flat shredders that have a flat blade with a blade edge angle of 5 to 80 °, and shred at a lowering angle of 0.1 to 70 °. The method for recovering a polyester resin support according to claim 1. The polyester material according to claim 1 or 2, wherein the recording material shredded by the first shredder is held by a holding means until shredded by the second shredder. Resin support recovery method. A polyester-based material in which a recording material having at least one coating film on a polyester-based resin support is treated with an alkaline processing liquid, the coating film is peeled off from the polyester-based resin support, and then the polyester-based resin support is recovered. In the resin support recovery method,
The recording material uses a shredding device having a first shredding machine and a second shredding machine arranged so that the axis of the shredding machine is perpendicular to the recording material on the conveyance path. A method for recovering a polyester-based resin support, which is chopped into chips. The first shredder has a die-cut slit roll and a backing roll that rotate in opposite directions, and the die-cut slit roll has at least one cutting blade having a blade edge angle of 10 to 85 °. The method for recovering a polyester resin support according to claim 4. The first shredder has at least one set of rotating blades composed of a set of upper blades and lower blades rotating in opposite directions, and the edge angles of the upper blades and the lower blades are 30 to 90 °, respectively, and The method for recovering a polyester-based resin support according to claim 4, wherein a difference in edge angle between the upper blade and the lower blade is 0 to 15 °. The polyester resin support according to any one of claims 4 to 6, wherein the second shredder has a crosscut roll having at least one crosscut blade having a blade edge angle of 10 to 85 °. Body recovery method. The polyester resin support recovery method according to any one of claims 1 to 7, wherein the coating film has a natural polymer binder or a synthetic polymer binder. The method for recovering a polyester resin support according to any one of claims 1 to 8, wherein the recording material is an indeterminate shape having an outer size of 0.1 to 100 mm.

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