JP2000025039A - Recovering method of magnetic film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a recovered resin material by a simple method and also make the magnetic substance in a magnetic layer recoverable by a method wherein laminated matters except a support such as a protective layer and the like are separated from a waste magnetic film and classified and finally sphere resin materials as the main raw material of the magnetic film into uniform sizes. SOLUTION: First of all, by crushing a recovered magnetic film with, a known crushing means, small pieces to be processed with a proper size are formed. Next, the small pieces to be processed are boiled so as to swell a protective layer, a printed layer and the like except a support. Next, the swollen small pieces to be processed are dehydrated with a dehydrating device. Next, by applying an impact triturating force to the small pieces to be processed and drying the resultant pieces and, further, laminated matters except the support such as a protective layer, an undercoating layer, a printed layer, a magnetic layer and the like except the support are separated from the support except the support by means of an impact force so as to separate the recovered resin materials 83b composing the support from the laminated matters 84 and, at the same time, the separate recovered resin materials 83b are sphered through impact forces and their following frictional heats in order to classify the laminated matters 84 so as to recover separately.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for collecting magnetic films, and more particularly, to a method for processing video tapes, floppy disks, magnetic tickets or commuter passes,
Cash dispenser card, or a magnetic film constituting a magnetic recording medium or the like such as various prepaid cards such as telephone cards, highway cards, etc., a magnetic film mainly comprising a thermoplastic resin support, the magnetic film of the support Protective layer, undercoat layer, and a magnetic film composed of a laminate such as a print layer and a magnetic layer, and from the magnetic film that becomes unnecessary after use or during the manufacturing process, the protective layer, the undercoat layer, the print layer Also, the present invention relates to a method for collecting a magnetic film in which a laminate other than the resin material support such as a magnetic layer is separated and classified, the resin material support is used as a recovered resin material, and the magnetic material of the magnetic layer is also recovered.

[0002]

2. Description of the Related Art A magnetic film has a low possibility of plagiarism because a new record can be repeatedly written as a magnetic recording medium, and the recorded contents can be easily corrected or cannot be viewed. Used for various purposes.

[0003] Among such magnetic films, those that become unnecessary after use or in the manufacturing process are effectively used by incineration power generation or blast furnace reduction method in addition to simple incineration and landfill treatment. Among them, the blast furnace reduction method involves blowing waste resin such as the magnetic film into a blast furnace and reducing iron ore with the gasified resin. It can be used as fuel and has high energy use efficiency. Further, as a method of reproducing the magnetic film, the following processing is performed.

For example, a protective layer, an undercoat layer, a printed layer, a magnetic layer, and the like other than the resin material support are scraped off by a polishing method such as buff polishing to collect the resin material.

In addition, a magnetic film is stirred with a solvent such as water and a chemical in a treatment tank provided with a stirring means, and a magnetic substance mixture and a magnetic film from which the magnetic substance has been removed are separated and collected from the treatment tank. I have.

However, in general, magnetic films having a plurality of layers of different materials are difficult to reproduce and are not often used.

[0007]

The conventional magnetic film recovery method has the following problems.

As described above, it is difficult to regenerate a magnetic film. Therefore, the unnecessary magnetic film is simply incinerated in an incinerator and discarded, or is effectively used as an energy source. When used as a substitute for coke, it has the advantage of reducing the amount of coke used and high energy use efficiency.However, some magnetic films have layers made of various materials. If incinerated easily, there is a risk of pollution such as generation of toxic gas depending on the material.

[0009] In addition, taking a pachinko prepaid card as an example, there is a problem that if the annual collection amount is 5,000 to 6,000 tons, incineration of the card requires a processing cost of 25 yen per kg, and the cost is high.

[0010] In the recovery method by polishing, it takes time to remove unnecessary parts, requires equipment such as a polishing apparatus, and it is difficult to completely recover a plurality of materials. There was a problem.

When a solvent is used, the ink of the printing layer which has been peeled off by the solvent is dispersed in the processing layer, and the magnetic material to be recovered is colored by the ink, and various chemicals are used. In the treatment of wastewater that is mixed with water, if it is disposed of as it is, there is a problem of pollution.
The burden on the process, equipment, and the like required for the processing increases.

Further, after the above steps, filtration or the like is required to recover only the magnetic substance from the recovered magnetic substance mixture, and it is necessary to dry the substance to reuse it. There is a problem that it takes time.

SUMMARY OF THE INVENTION The present invention has been developed to solve the problems in the course of the process, and a relatively simple method is used to remove the unnecessary magnetic film from a support such as a protective layer, an undercoat layer, a print layer and a magnetic layer. Except for separating and classifying the laminate other than the above, the resin material, which is the main raw material of the magnetic film, is sized to obtain a recovered resin material,
It is another object of the present invention to provide a method for collecting a magnetic film capable of reusing a magnetic film capable of collecting a magnetic substance of the magnetic layer.

[0014]

In order to achieve the above object, a method for recovering a magnetic film according to the present invention comprises a crushing step of crushing a magnetic film into a plurality of small pieces to form a small piece to be treated; Boiling and swelling the individual pieces to be treated, applying an impact-milling force to the swelled pieces to be dried and drying the pieces; It is characterized by including at least a step of peeling and classifying a laminate other than the support such as an attraction layer, a print layer and a magnetic layer, and sizing the resin material support to obtain a recovered resin material.

When the magnetic film is in the form of a tape such as a video tape or a cassette tape, the magnetic film is stretched by 40 to 100% and then crushed into a plurality of small pieces to form small pieces to be processed. The crushed small pieces are dried by applying an impact grinding force,
A laminate other than the support such as a protective layer, an undercoat layer, a print layer and a magnetic layer is peeled off from the resin material support of the magnetic film.
Classification and sizing of the resin material support can also be used as a recovered resin material.

After the boiling step, the small pieces to be treated are dehydrated, and if the moisture content of the small pieces to be treated is set to 15 to 50%, when the impact milling force is applied, the lamination from the resin material support is performed. Easy to peel and classify objects.

Further, an impact-milling force is applied to the individual crushed small pieces to separate and classify a laminate other than the support such as a protective layer, an undercoat layer, a printing layer and a magnetic layer. In addition, the step of sizing the resin material support to obtain a recovered resin material can be repeated a plurality of times.

Further, the magnetic material of the separated and classified magnetic layer can be collected by being attracted by a magnetic force.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method for recovering a magnetic film according to the present invention will be described with reference to the drawings.

The magnetic film to be processed is a magnetic film constituting a video tape, a floppy disk, a magnetic ticket or a commuter pass, a card for a cash dispenser, or various prepaid cards such as a telephone card and a highway card. In addition to the resin material support (hereinafter referred to as “support”), a protective layer, an undercoat layer,
It can be a magnetic film composed of a laminate such as a print layer and a magnetic layer.

As the support, a thermoplastic resin such as acetate, polyvinyl chloride and polyester, mainly polyester is used, and a protective layer, an undercoat layer and a print layer are formed as required.

The magnetic layer is made of γ-Fe ₂ O ₃ or γ-Fe ₂ containing Co.
This is a layer formed by coating a magnetic material such as O ₃ on a support using a binder and an additive such as vinyl chloride, vinyl acetate, and polyurethane by a method such as knife coating or reverse roll coating.

FIG. 7 shows a typical structure of a prepaid card. In a support made of a polyester film, a printed layer of about 2 .mu.m is formed on the surface and a magnetic layer of about 20 .mu.m is formed on the back side. Further, a printing layer of about 2 μm is formed on the magnetic layer, and the magnetic card has a thickness of about 212 to 220 μ as a whole.

[Magnetic Film Crushing Step] After the magnetic film as described above is collected, it is crushed using a known crushing means in the crushing step, and formed into small pieces to be processed having an appropriate size.

When the magnetic film to be processed is in the form of a tape such as a video tape or a cassette tape, if the magnetic film is stretched before the crushing step, it will be required to perform the following (drying / peeling / classifying / sizing step). It is easy to peel off. Here, the stretching is set to 40 to 100%, and if it is 40% or less, the effect of peeling is weak, and if it is 100% or more, there is a possibility of cutting.

In the crushing step shown in FIG.
Crushes the collected magnetic film 81 so that one side is 5 to
A rectangular piece such as a rectangle or a square of about 25 mm, or a polygonal small piece 82 such as a triangle or a trapezoid is formed, and is referred to as a "cutter mill" for convenience in this embodiment.
FIG. 2 shows an example of the “cutter mill”.

Reference numeral 121 denotes a cutter mill body, which is provided with an input port 123 for inputting an object to be crushed, which is a magnetic film.

In the cutter mill main body 121, there are four rotating blades 125 which are long in the horizontal direction on the outer periphery of a cutter support 124 which is supported on both side walls of the cutter mill main body 121 and is rotated vertically by a rotation driving means (not shown). These four rotating blades 125 are arranged so that the cutting edges of the four rotating blades 125 are located on the same rotation locus so as to form an equal angle of 90 degrees in the rotation direction of the cutter support 124. ing.
Further, the two fixed blades 126 are connected to the rotary blades 12 through a slight gap with respect to the rotation locus of the blade edge of the four rotary blades 125.
The cutter mill body 12 is positioned substantially symmetrically with respect to the rotation locus of the blade edge of No. 5.
1 and the rotation of the rotary blade 125 causes the rotary blade 125 to rotate.
The object to be crushed is crushed between the fixed blade 126 and the fixed blade 126.

The clearance between the two fixed blades 126 and the rotary blade 125 can be freely adjusted so that the object to be crushed can be crushed to a desired size. In addition, the periphery of the rotation locus of the rotary blade 125 except for the insertion port 123 is surrounded by a mesh screen 129. In this embodiment, the screen 129 is a small piece 82 having a size of about φ8 to 20 mm.
Is formed of a mesh that can pass through. Further, a screen receiver is provided on the outer periphery of the screen 129 so as to surround the screen 129 at a predetermined interval from the screen 129, and a small piece 82 to be processed passing through the screen 129 is disposed between the screen 129 and the screen receiver. It is configured to be collected. The screen receiver can be opened and closed so that the small piece to be processed 82 that has passed through the screen 129 can be discharged to the outside of the cutter mill main body 121.

In the above-mentioned cutter mill 120, when the above-mentioned crushed material is thrown in from the inlet 123 and the cutter support 124 is rotated by a rotation driving means (not shown), the crushed material is brought into contact with the rotary blade 125 of the cutter support 124. The shape and area between the fixed blades 126 via the screen 129 are undefined,
Substantially the entire amount is formed in the small piece 82 crushed to about 5 to 25 mm on a side, and the small piece 82 is recovered by opening the screen receiver and transported to the next step.

The crushing means used in the present invention is not limited to the cutter mill 120.
Any material can be used as long as it can be crushed to about 25 mm, preferably about 5 to 20 mm, and the crushed material having a side of about 5 to 25 mm is a powdery crushed material of 5 mm or less. If it is 25 mm or more, it will be entangled with the pins of the separator in the [drying / peeling / classifying / sizing step] to be described later, so that it is difficult to peel off.

[Boiling Step] In the above step, the crushed small pieces are treated with hot water of about 80 to 90 ° C. or more for about 30 minutes.
By boiling for at least a minute, the protective layer, the printed layer, and the like other than the support 83a are swollen from the support 83a.

When the object to be treated is stretched in the above-mentioned stretching step in the form of a tape as described above, the boiling step can be omitted.

[Dewatering Step] The small pieces to be treated swollen in the above-mentioned step have a water content of 1 by a dehydrating device such as a centrifuge.
Dehydrate to about 5-50%. When the water content is 15% or less, peeling is difficult in the [drying / peeling / classifying / sizing step] described later, and when the water content is 50% or more, the moisture in the separator is too large.

[Drying / Peeling / Classifying / Sizing Step] In this [Drying / Peeling / Classifying / Sizing Step], an impact grinding force is applied to the small pieces 82 crushed in the above-mentioned [Crushing Step]. The small particles 82 to be processed are dried by the impact crushing force, mainly frictional heat caused by the impact force, and further, the protective layer other than the support, the undercoat layer,
Printing layer, magnetic layer, etc. (hereinafter, referred to as “lamination”) 84
Is removed, and the recovered resin material 8 composed of the support body 83a is removed.
3b and the laminate 84 are separated, and the separated recovered resin material 83b is sized by the impact force and the frictional heat associated therewith to classify the collected resin material 83b into the laminate 84 and collect individually. More specifically, by repeatedly applying the beating and bending actions by the impact attrition force to the small piece to be processed 82, the laminate 84 is finely broken and separated from the surface of the collected resin material 83b composed of the support 83a of the small piece to be processed 82. Alternatively, the laminate 84 such as a protective layer, an undercoat layer, a print layer, and a magnetic layer is peeled between the layers of the magnetic film 81 by partially cutting the laminate 84 together with the support 83a.

Further, since the temperature of the magnetic film 81 is raised and dried by the frictional heat generated in each of the small pieces 82 to be processed, the magnetic film 81 is dried and hardened together with the laminate 84, so that the laminate 84 is further strengthened. It is easy to peel off.

FIG. 6 shows an example of the configuration of the whole apparatus including the drying, peeling, classification and sizing means (in the present embodiment, referred to as "separator" for convenience) used in the method of the present invention.

Referring to FIG. 6, first, an outline of the entire separator 130 will be described. The separator 130 is provided with a supply inlet 132 into which each of the small pieces 82 to be processed is charged, and the small pieces 82 are processed in the separator 130. Of the magnetic film 81 having a laminate 84 other than the support 83a such as a protective layer, an undercoat layer, a printing layer, and a magnetic layer from the small piece 82 to be processed, thereby forming the recovered resin material 8
An outlet 153 for taking out 3b and the collected resin material 83
b, a laminate 84 other than the support 83a, such as a protective layer, an undercoat layer, a print layer, and a magnetic layer, which have been separated and peeled off; And a discharge port 152 for discharging a suitable resin material or the like.

The small pieces 82 to be processed processed in the previous step are supplied to the supply inlet 132 through a supply pipe 231. The outlet 153 is connected to the supply port 132 by the communication pipe 23.
5, and a pipe 236 from a compressed air supply source (not shown) is connected to the outlet side of the communication pipe 235. A flow straightening plate is provided at a communication portion of the pipe 236 so that compressed air mainly flows to the supply inlet 132 side.
Further, a branch pipe 237 is provided for branching the communication pipe 235 and communicating with the recovery tank 240 of the recovered resin material 83b. A two-way solenoid valve which is switched at appropriate intervals by, for example, a timer circuit at a branch point of the branch pipe 237 is provided. 238 are provided.
On the other hand, the discharge port 152 communicates with the collection tank 250 through a discharge pipe 239, and sucks the stack 84 and other layers of dust discharged from the discharge port 152 into a discharge pipe 239 provided with a blower 157. Then, it is configured to be collected in the collection tank 250.

3 to 5, the internal structure of the separator 130 will be described.
Reference numeral 2 denotes an opening communicating with the center of the fixed disk 131, a fixed end plate 133 is opposed to the fixed disk 131 via a processing space 155, and an outer peripheral edge of the fixed end plate 133 is attached to the peripheral side plate 135. Fix with. The processing space 1
A movable disk 141 which is driven to rotate by a rotating horizontal shaft 142 is provided in the rotary shaft 55.
It is pivoted by 43. The rotation horizontal axis 142 is
It is rotationally driven by rotational driving means such as a motor 161.

On the fixed disk 131, each fixed: pin 134 is sequentially planted on a plurality of concentric circles (relative to the movable disk 141) on the rotation trajectories a1 to a6 (FIG. 5). On the other hand, on the movable disk 141, movable pins 144 that are alternately inserted between rotation trajectories of the fixed pins 134 on a plurality of rotation trajectories b1 to b6 different from the fixed pins 134 are sequentially planted. The fixed and movable pins 134 and 144 are arranged so as to obtain the effect of peeling or separating the laminate 84 from the small piece 82 to be processed by the impact attrition force.

More specifically, the number of the fixed pins 134 is 16 on the rotation trajectory a1 near the center of the fixed disk 131.
The rotation locus a located on the outer peripheral side of the rotation locus a1
2, 24 on the rotation trajectory a3, 36 on the rotation trajectory a4, 40 on the rotation trajectory a5, and 42 on the rotation trajectory a6. Have been. On the other hand, the number of the movable pins 144 is four on the rotation trajectory b1 near the center of the movable disk 141, and the number of the rotation trajectories b located on the outer peripheral side from the rotation trajectory b1.
Four are planted on 2 and six are planted on the rotation locus b6.

In practice, the fixed and movable pins 134, 1
The grinding force applied to the small piece to be processed 82 is reduced by increasing the clearance between the pieces 44, and the grinding force is increased by decreasing the clearance.

In FIG. 3, a discharge space 15 is provided on the outer peripheral side of the movable disk 141 and on the inner peripheral side of the peripheral side plate 135.
A screen 151 having a predetermined mesh formed by punching pores having a desired diameter is provided around the screen 6, and a discharge port 152 is provided below the discharge space 156.

The screen 151 of the processing space 155
An outlet 153 is provided in the lower part of the
Reference numeral 3 denotes a collection tank 240 for communicating with the supply inlet 132 via the communication pipe 235 as described above, and for collecting the resin material collected via the branch pipe 237 which branches off the supply inlet side of the communication pipe 235. In communication with As another example, a plug valve for opening / closing control is disposed in the outlet 153, and the outlet 153 communicates with the supply inlet 132 through a blower (not shown) that sucks air in the separator 130. You can also.

Therefore, in the separator 130 described above, when the rotating horizontal shaft 142 is rotated by the rotation driving means of the motor 161 to rotate the movable disk 141 and supply the small pieces 82 to the supply inlet 132, The small piece 82 is located at the center of the processing space 155 and has fixed and movable pins 13.
4,144 by the impact attrition force
2 is fixed, and the impact by the movable pins 134 and 144 repeatedly applies a bending action to each of the small pieces 82 to be processed, so that the laminate 84 is finely broken and separated from the support 83a. It should be noted that the small particles 8 to be treated
The surface of a part of the recovered resin material 83b composed of the second support 83a is shaved and peeled off together with the laminate 84.

Each of the small pieces 82 to be processed by the impact grinding force
Increases the temperature of the surface of the small piece 82 to be processed, and further facilitates peeling of the laminate 84 from the surface of the small piece 82 to be processed. That is, the magnetic film 8 is generated by frictional heat.
1 rises in temperature and becomes hardened by drying. In this state, the laminate 8 is repeatedly beaten by the impact of the impact attrition.
4 is promoted.

Although the recovered resin material 83b is in the form of flakes, the magnetic film 81 having the peeled laminate 84 and some of the resin material that has been scraped off are large in powder or flake form, and each side is large. Becomes 1.5 mm or less.

The laminate 8 separated from the small piece to be treated 82
4 and the shaved resin material pass through the screen 151 by the centrifugal action of each movable pin 144, and
After being classified into 56, the blower 15
It is sucked and discharged to the outside through 7.

In the embodiment, the blower 157 is 5.5 kw, 5 kg / cm ² / pressure,
m ³ / min, for medium-sized machines 3.7 kw, 3 kg / cm ² / pressure,
The laminate 84 and the like separated from the small piece to be treated are sucked together with the air in the separator 130 at a rate of 1 to 1.5 m ³ / min.

On the other hand, the sized support 83 as the recovered resin material 83b having a size that does not pass through the screen 151.
a stays in the screen 151. This recovered resin material 8
The recovered resin material 83b to which the laminate 84 is still attached is mixed in 3b. However, since the outlet 153 and the supply inlet 132 communicate with each other via the communication pipe 235, the small pieces 82 to be processed and the recovered resin material 83b taken out of the outlet 153 are returned to the supply inlet 132 to be separated by the separator 235. In the area 130, the sheet 84 is again subjected to the impact grinding force, and is repeatedly beaten and bent, so that the laminate 84 remaining on the surface of the small piece 82 to be processed is separated from the small piece 82 and passes through the screen 151, The air is discharged from the outlet 152 to the outside by the blower 157. Although the recovered resin material 83 b is refluxed, most of the recovered resin material 83 b remains in the screen 151 without being pulverized so finely as to pass through the screen 151.

The drying, peeling, classifying, and sizing steps described above include the following steps:
The stack 84 of pieces to be processed 82 in the batch can be repeated as many times as necessary until most of the stack 84 is separated and removed via the outlet.

The above separator 130 is rotated by the rotation driving means 1
61, the downstream side of the communication pipe 235 is opened by a two-way solenoid valve 238 and the branch pipe 237 side is closed,
By supplying the compressed air from the pipe 236 to the communication pipe 235, the compressed air generates an airflow that circulates from the communication pipe 235 to the supply inlet 132, the processing space 155, the outlet 153, and again to the communication pipe 235. When each piece 82 to be processed of one batch is supplied to the supply inlet 132 through the supply pipe 231, the piece 8 to be processed is processed in the separator 130 and is processed.
The laminate 84 and the pulverized resin material peeled off from the surface of No. 2 are discharged to the collection tank 250 by the blower 157 through the screen 151, while the support 83a or the collected resin material 83b remaining in the screen 151 is circulated. The air is sucked into the communication pipe 235 by the air flow and the processing space 15 is returned again.
5 and processed in a separator 130, and this series of steps is repeated as many times as necessary until most of the laminates 84 in a batch are separated and removed.

Next, after the above processing is completed, the downstream side of the communication pipe 235 is closed by the two-way solenoid valve 238 and the branch pipe side is opened to remove the recovered resin material 83b remaining in the screen 151. Branch pipe 2 from communication pipe 235
After collecting through the collecting tank 240, the collecting tank 240 collects.

Incidentally, the water content of the polyester recovered in the recovery tank 240 was about 1%. On the other hand, the moisture content of the finely divided polyester collected in the collection tank 250 and the broken and peeled laminate 84 was 2-3%.

Note that, instead of the two-way solenoid valve 238, a solenoid valve for opening and closing the branch pipe 237 and the communication pipe 2
It is also possible to provide an electromagnetic valve that opens and closes the downstream side of 35, and to open and close these two electromagnetic valves alternately.

[Separation Step] In this step, the object to be treated is combined with the laminate 84 such as a protective layer, an undercoat layer, a printed layer, and a magnetic layer by applying an impact grinding force in the drying, peeling, classifying, and sizing steps. Recovered resin material 8 ground to a similar size
3b is collected in the collection tank 250. In this step, the magnetic bodies 85 included in the collected magnetic layer are individually sorted and collected by magnetic force.

Further, the recovered resin material 83 is screened by sieving.
b and the laminate 84 can also be sorted and collected according to their respective particle sizes.

The recovered resin material 83b, the laminated body 84, and the magnetic body 85 recovered by the above steps are used as the recovered resin material 8
3b can be reused as a resin molded product such as a magnetic card support or a hanger. The magnetic material 85 can be reused as a magnetic material, for example, by being coated again as a magnetic layer. However, since the magnetic material 85 is recovered in a dry state, it is easy to reuse.

The results of recovering the resin material from the magnetic film by the method of the present invention described above are shown below as examples.

[0061]

[Table 1] [Example 1]

[0062]

[Table 2] [Example 2]

[0063]

Since the present invention is configured as described above, the following effects can be obtained.

By using a relatively simple and easy method, a laminate other than a support such as a protective layer, an undercoat layer, a printing layer, and a magnetic layer can be separated and separated from a magnetic film to be processed. The resin material could be efficiently recovered from inside and reused.

Further, since the resin material is recovered in the form of flakes, it is preferable that the resin material is dropped into the screw by the hopper and the screw is bitten at the time of re-forming.

Furthermore, only the magnetic material could be recovered from the recovered laminate by magnetic force, and the recovered magnetic material could be easily reused because it was in a dry state.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a series of processing steps showing in principle and schematically an outline of a case where a method of a basic embodiment of a method for collecting a magnetic film, which is an example of a processing object of the present invention, is applied.

FIG. 2 is a longitudinal sectional view showing a cutter mill (crushing means) used in the embodiment of the present invention.

FIG. 3 shows a separator (peeling / separation) used in an embodiment of the present invention.
It is a front view which shows the principal part of a (classification means).

FIG. 4 is a plan view of FIG. 3;

FIG. 5 is a cross-sectional view of a main part taken along line VV in FIG. 3;

FIG. 6 shows a separator (dried and used) used in the embodiment of the present invention.
FIG. 2 is an overall perspective view of each device communicating with the separator (peeling / classifying / granulating means).

FIG. 7 is an enlarged schematic sectional view of a magnetic card to be processed in an embodiment of the present invention.

[Explanation of symbols]

 81 Magnetic film 82 Small piece to be processed 83a Support body 83b Recovered resin material 84 Laminated material 85 Magnetic body 120 Crushing means (Cutter mill) 121 Cutter mill main body 123 Input port 124 Cutter mill support 125 Rotary blade 126 Fixed blade 129 Screen 130 Separator 131 Fixed disk 132 Supply inlet 133 Rotating end plate 134 Fixed pin 135 Peripheral side plate 141 Movable disk 142 Rotating horizontal shaft 143 Bearing 144 Movable pin 151 Screen 152 Outlet 153 Outlet 155 Processing space 156 Drainage space 157 Blower 161 Motor 235 Connecting pipe 237 Pipe Pipe 238 Two-way solenoid valve 239 Discharge pipe 240 Recovery tank 250 Collection tank

Continued on the front page F term (reference) 4D075 BB08Z BB12Z BB20Z BB24Z BB63Z BB79Z BB91Z CA50 DB31 DB33 DB38 DB48 DC28 EB15 EB19 EB38 4F201 AA24 AA50 AD02 AD20 AE04 AG03 AH38 BA05 BC01 BC12 BC13 BP22 BP21 BP21 BP21 BN22

Claims (5)

[Claims] 1. A crushing step of crushing a magnetic film into a plurality of small pieces to form a small piece to be treated, a step of boiling the crushed individual small pieces to be swollen, and swelling the small pieces to be treated. On the other hand, while drying by applying an impact grinding force, a protective layer from the resin material support of the magnetic film,
A magnetic film characterized by comprising at least a step of peeling and classifying a laminate other than a support such as an undercoat layer, a print layer and a magnetic layer, and sizing the resin material support to obtain a recovered resin material. Collection method. 2. A crushing step in which a magnetic film is stretched by 40 to 100% and then crushed into a plurality of small pieces to form small pieces to be treated, and an impact grinding force is applied to the crushed small pieces. While being added and dried, a laminate other than the support such as a protective layer, an undercoat layer, a print layer and a magnetic layer is peeled and classified from the resin material support of the magnetic film, and the resin material support is sized. And recovering the magnetic film. 3. The method for recovering a magnetic film according to claim 1, further comprising a step of dehydrating the small pieces to be treated after the boiling step, so that the moisture content of the small pieces to be treated is 15 to 50%. 4. A layer other than a support such as a protective layer, an undercoat layer, a printing layer and a magnetic layer is peeled and classified by applying an impact grinding force to each of the crushed individual pieces to be processed. And repeating the step of sizing the resin material support to obtain a recovered resin material a plurality of times.
Or the method for collecting a magnetic film according to 3. 5. The method for recovering a magnetic film according to claim 1, further comprising a step of recovering the magnetic material of the separated and classified magnetic layer by magnetic attraction.