JP3250761B2 - Waste magnetic tape treatment method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating a waste magnetic tape and a molded product using the waste magnetic tape which is a cut or crushed product in a curl shape obtained by the treatment method.

[0002]

2. Description of the Related Art An enormous amount of waste magnetic tapes such as video tapes and audio tapes are discarded every year, but no effective means for reusing them has been found. Under such circumstances, the inventors of the present invention disclosed in Japanese Patent Application No. Hei.
No. 74742, a waste magnetic tape such as a video tape, a cassette tape or the like is cut or crushed to a length of 1 to 50 mm, and is heated at 100 to 200 ° C. to shrink into a curl shape. A method for manufacturing a building material board using the obtained waste magnetic tape was proposed. Also, in Japanese Patent Application No. 3-350138,
A panel material for automobiles obtained by cutting or crushing waste magnetic tapes such as video tapes and cassette tapes into appropriate sizes, and heat-treating the shrink pieces obtained by adding a binder to the shrink pieces and press-molding them. The manufacturing method was proposed.

[0003]

The above-mentioned method of treating a waste magnetic tape is a method that can effectively use a waste magnetic tape, and has been highly evaluated. Further, the molded articles such as the above-mentioned building material boards and panel materials for automobiles have excellent properties and are inexpensive, so that their utility value is high.

[0004] Therefore, the present inventors have further studied the above-mentioned processing method and the molded article, and in the course of the research, a more excellent processing method and a molded article using a waste magnetic tape obtained by the processing method. Thus, the present invention has been completed. That is, an object of the present invention is to improve the method for treating waste magnetic tape and to provide a molded article using the waste magnetic tape obtained by the treatment method.

[0005]

SUMMARY OF THE INVENTION According to the present invention, a waste magnetic tape is made into a curled cut or crushed material by giving shrinkage deformation to the waste magnetic tape and then cutting or crushing the waste magnetic tape to a length of 1 to 50 mm. A method for treating a waste magnetic tape, characterized by being obtained by adding a binder to a waste magnetic tape which is a cut or crushed product in a curl shape obtained by the treatment method and press-molding the same. And a molded article of waste magnetic tape.

As the waste magnetic tape, a defective tape and a used product (waste), such as a video tape and an audio tape, which come out of a factory can be used. Of course, it is possible to use an unused good tape, but this causes an increase in product cost.

[0007] The method of imparting shrinkage deformation to the waste magnetic tape is not particularly limited, but preferred methods include the following. A method of imparting shrinkage deformation to a waste magnetic tape by pulling the waste magnetic tape while rubbing the tape surface against the peripheral surface of a heated pin. A method in which the waste magnetic tape is contracted by pulling the waste magnetic tape while pressing the tape surface against the cutting edge of the blade. Two rollers are arranged at predetermined intervals such that their axes are substantially parallel to each other, and the waste magnetic tape is wound around the axis of one roller, and then wound around the axis of the other roller. A method in which a portion of the waste magnetic tape located between the two rollers is tensioned by rotating the roller, and the waste magnetic tape is subjected to shrinkage deformation by the tension.

[0008] The heat pin used in the above shrinkage deformation method can be heated to a temperature of 250 ° C or higher,
For example, metals, ceramics, and ceramics are preferable.
The shape is preferably a cylindrical shape or a prismatic shape such as a triangular prism or a quadrangular prism. The heating temperature of the heating pin is preferably 100 to 250 ° C., more preferably 15 to 250 ° C.
0-220 ° C. If the heating temperature of the heating pin is less than 100 ° C., it is difficult to sufficiently curl the cut or crushed material of the waste magnetic tape, and if it is higher than 250 ° C., the waste magnetic tape deteriorates. The moving speed of the waste magnetic tape varies depending on the heating temperature of the hot pin, the degree of friction between the tape surface of the waste magnetic tape and the peripheral surface of the hot pin, and the like.
min. is preferable, and can be set by observing the curl shape of the obtained cut or crushed material.

The blade used in the above-mentioned shrinkage deformation method has a blade edge of 1 to 120 °, preferably 10 to 6 °.
Metals, ceramics, and ceramics having an angle of 0 ° are preferred. The force when pushing the waste magnetic tape against the blade edge of the blade can be set by observing the curl shape of the obtained cut or crushed material, but usually, the waste magnetic tape is brought into contact with the tip of the blade, The blade is rubbed at a contact angle slightly larger than the angle of the tip of the blade and equal to or less than twice.

The thickness and material of the roller used in the above-mentioned shrinking deformation method are not particularly limited.
A cylindrical metal roller of about 0 cm can be used. The interval at which the two rollers are disposed is not particularly limited, but may be, for example, at an interval of 30 to 100 cm.
The direction of rotation of the two rollers depends on how the waste magnetic tape is wound, but is rotated in a direction in which tension is generated in a portion between the two rollers of the waste magnetic tape. It is not necessary to rotate both rollers, and it is also possible to rotate only one roller to generate the necessary tension on the waste magnetic tape. The tension applied to the waste magnetic tape can be set by the rotational force of the roller while observing the curl shape of the obtained cut or crushed material. The tension for obtaining a preferred curl shape varies depending on the thickness and strength of the waste magnetic tape or the size of the cut or crushed material, but usually the force for stretching the waste magnetic tape by 1.1 to 2.0 times. It is. If the stretching is 1.1 times or less, a curl shape due to shrinkage deformation cannot be obtained, and if the stretching is 2.0 times or more, the curl shape becomes a string-like shape having no collapsed hollow.

In the method for treating a waste magnetic tape according to the present invention, after the shrinkage deformation is imparted, the waste magnetic tape is reduced in length from 1 to 5 mm.
Cut or crush to 0 mm, preferably 3 to 10 mm. 1
When grinding to less than mm, grinding is too costly,
In addition, since it is powdery, it does not have a structure having voids inside. On the other hand, if it is larger than 50 mm, the surface state becomes rough and the strength is inferior when a molded article is produced, so that it is not practical. Means for cutting or pulverizing the waste magnetic tape is not particularly limited. For example, an impact pulverizer as shown in FIG. 1 can be used. In FIG. 1, 1 is a hopper, 2 is a rotary blade, 3 is a fixed blade, 4 is a screen, and 5 is a crusher body. When the contracted and deformed waste magnetic tape is put into such an impact-type pulverizer, the waste magnetic tape is
And the fixed blade 3 cuts or crushes it into curled cut or crushed material. The size of the crushed material (or cut material) obtained at this time can be arbitrarily selected by setting crushing conditions and changing the size of the mesh of the screen 4. For example, when the size of the pulverized material obtained by actually performing the pulverization was measured, it had the following distribution. 5 mm or more 1% 3 to 5 mm 40% 3 mm or less 59% Also, when the shape of the obtained pulverized product was observed, it was found to have curled shapes as shown in I and II in FIG.

In the present invention, a binder is added to a waste magnetic tape (hereinafter, referred to as a waste magnetic tape of the present invention) which is a cut or crushed product in a curl shape obtained by the above-described processing method, and is subjected to pressure molding. Thus, a molded body can be obtained. The binder is preferably a high-temperature reactive binder that can be cured and molded at room temperature or by heating such as latex, liquid rubber, polyurethane adhesive, epoxy adhesive, melamine resin, phenol resin, urea resin, and the like. The amount of the binder used is 3 to 70 parts by weight, preferably 10 to 50 parts by weight, based on 100 parts by weight of the waste magnetic tape of the present invention. When manufacturing the molded article, a low-temperature reactive binder such as starch paste, polyvinyl alcohol, arabic rubber paste, and casein paste is used together with the high-temperature reactive binder to produce the waste magnetic tape 100 of the present invention.
5 to 30 parts by weight, preferably 10 to 20 parts by weight based on parts by weight
Parts by weight can also be used. That is, after the waste magnetic tape of the present invention is provisionally molded using the above-mentioned low-temperature reactive binder, it can be subjected to pressure molding using the above-mentioned high-temperature reactive binder.

In the production of the molded article, ferrite, carbon black, graphite, carbon fiber or conductive metal powder having radio wave characteristics is added to the waste magnetic tape of the present invention, depending on the required performance, or A conductive metal fiber or a 12 to 100 mesh conductive metal wire mesh can be mixed inside, for example, in a sandwich shape.

The ferrite includes a spinel type,
There are garnet type and magnet plumbite type, which are added alone or as a mixture to 10 to 150 parts by weight, preferably 30 to 70 parts by weight, based on 100 parts by weight of the waste magnetic tape of the present invention. As the carbon black, channel black, furnace black, acetylene black, thermal black, lamp black and the like can be used. These are used in an amount of 1 to 100 parts by weight, preferably 1 to 100 parts by weight, based on 100 parts by weight of the waste magnetic tape of the present invention. 10 to 30 parts by weight are added. As the conductive metal powder, iron, stainless steel, copper, aluminum or the like can be used alone or mixed with ferrite, carbon black or the like. To 150 parts by weight, preferably 30 to 70 parts by weight. Examples of the conductive metal fiber or the conductive wire mesh include fibers of iron, stainless steel, copper, aluminum, and the like, or fibers knitted with these fibers.
100 to 100 mesh wire mesh can be used, and these are 1 to 100 parts by weight based on 100 parts by weight of the waste magnetic tape of the present invention.
Parts by weight, preferably 10 to 30 parts by weight.

In the production of the above-mentioned molded product, a flame retardant and the like can be further added according to the required performance. As the flame retardant, antimony trioxide, chlorinated paraffin, molybdenum oxide and the like can be used, and these are preferably added in an amount of 3 to 10 parts by weight based on 100 parts by weight of the waste magnetic tape of the present invention.

In the above-mentioned molded article, when the above-mentioned binder is added to a cut or pulverized product obtained by imparting shrinkage deformation and cutting or pulverizing and then molding,
Air is sealed inside the curled cut or crushed material, and a void is formed inside. For this reason, the obtained molded article is excellent in heat insulation properties, sound absorption properties, flame retardancy, heat resistance, and the like. Further, since this molded article uses waste magnetic tape as a raw material, it is excellent in antistatic performance, electromagnetic wave shielding performance, etc., and is lightweight and inexpensive.
Because of such performance, the above-mentioned molded body is subjected to a bonnet by subjecting it to a building material board such as a wall material, a ceiling material and a floor material of a building, or a predetermined process such as press molding and punching. It can be preferably used as an automobile panel material such as a lining material for a back or an indoor ceiling, a core of a door, an engine cover, a partition plate and the like.

[0017]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, but it should not be construed that the present invention is limited thereto.

EXAMPLE 1 A metal pin 6 having a cylindrical shape (3 cm in diameter) was connected to a metal pin 6 by an electric heater (not shown).
It was heated to 200 ° C., and maintaining this temperature, contacting the tape surface ₇₁ of the waste magnetic tape 7 of the audio tape on the pin 6 as shown in FIG. 3, rubbing the tape surface ₇₁ on the peripheral surface of the pin While attaching, the waste magnetic tape 7 was pulled at a speed of 5 m / min. At this time, the waste magnetic tape 7 was heated by the pins 6 and contracted. When the waste magnetic tape 7 contracted and deformed in this manner was pulverized to a length of 1 to 5 mm using the pulverizer shown in FIG. 2, the waste magnetic tape 7 became a curled pulverized product. 20 parts by weight of a moisture-curable liquid-modified polybutadiene is added as a binder to the obtained curled pulverized product (100 parts by weight), and this mixture is uniformly mixed with a Hensyl mixer, and the mixture is put into a transfer mold. Pressed and heated at 150 ° C. for 10 minutes with a hot press to obtain a molded plate. Table 1 shows the physical properties of the obtained molded plate.

[0019]

[Table 1] In addition, in Table 1, the sound absorption attenuation rate was measured by a falling ball floor impact (measured by our company).

In the above method, since the waste magnetic tape 7 is contracted and deformed by using the heated pins 6, the thermal efficiency is good and the curl shape can be easily controlled. In addition, the obtained molded plate had preferable physical properties as a building material board as shown in Table 1.

[0021] Example 2: As shown in FIG. 4, the tape surface 9 of the waste magnetic tape 9 of the video tape on the cutting edge 8 _first blade 8
Contacting the _1, pulled to a method of directly toward the blade 8 as shown waste magnetic tape 9 while pressing the tape surface 9 ₁ the cutting edge 8 ₁ by the arrow B at a speed of 5 m / min.. In this case, the waste magnetic tape 9 underwent contraction deformation by the action of the cutting edge ₈₁ of the blade 8. The waste magnetic tape 9 contracted and deformed in this manner was pulverized to a length of 1 to 5 mm using a pulverizer shown in FIG. 2 to obtain a curled pulverized product. The same compound as in Example 1 was added to the obtained pulverized material, and the mixture was molded in the same manner to obtain a molded plate. Table 2 shows the physical properties of the obtained molded plate.
Shown in

[0022]

[Table 2]

Embodiment 3: As shown in FIG. 5, two rows are used.
Shafts 10 and 11 at 50 cm intervals ₁, 11
₁The comrades were arranged in parallel. Audio tape
Of the waste magnetic tape 12 on the shaft 10 of the roller 10₁Wrap around
The leading end 12 of the wound tape 12₁Pull out,
This part is the shaft 11 of the roller 11₁Roll on roller 10
Winded in the same direction as it was. As shown by arrows C and D
Then, the rollers 10 and 11 were rotated rightward.
When the rotation speed of the roller 11 is larger than that of the roller 10
By rotating the roller of the waste magnetic tape 12,
Part 22 between 10 and roller 11_TwoCreates tension
I let you. Due to this tension, the waste magnetic tape 12 contracts and deforms.
Awakened. The contracted and deformed waste magnetic tape 12 is shown in FIG.
Pulverize to a length of 1 to 5 mm using the pulverizer shown
A shaped pulverized product was obtained. Same as Example 1 for the obtained pulverized material.
Density to increase the physical strength
The molding was performed to 0.6. Of the molded plate obtained
Table 3 shows the physical properties.

[0024]

[Table 3]

[0025]

According to the waste magnetic tape processing method of the present invention, the waste magnetic tape can be effectively used. Further, the treatment method of the present invention is suitable for in-situ treatment, and the control of the curl shape is easier than the method of cutting or pulverizing a waste magnetic tape and then heating and shrinking the tape into a curl shape. In particular, in the processing method according to the second aspect, since the waste magnetic tape is contracted and deformed by using the heated hot pin, the thermal efficiency is good and the processing cost can be reduced. Further, in the processing method of claims 3 and 4, since the waste magnetic tape can be shrunk and deformed without heating, there is no possibility that the physical properties of the curled cut or crushed material are reduced, and the processing is performed. Cost can be reduced. Further, the molded article of the present invention is used because the waste magnetic tape to be used is a cut or crushed product in a curl shape obtained by the above processing method,
The curl shape of the cut or pulverized product is uniformly controlled, and the resulting molded product has uniform physical properties without unevenness.

[Brief description of the drawings]

FIG. 1 is a sectional elevation view of a main part showing an example of a crusher used in the present invention.

FIG. 2 is an illustration of a curled cut or crushed material obtained by the processing method of the present invention.

FIG. 3 is a conceptual diagram for describing a method of processing a waste magnetic tape according to the first embodiment.

FIG. 4 is a conceptual diagram for explaining a method of processing a waste magnetic tape according to a second embodiment.

FIG. 5 is a conceptual diagram for explaining a method of processing a waste magnetic tape according to a third embodiment.

[Explanation of symbols]

6 Pin 7 Waste magnetic tape of audio tape 7 ₁ Tape surface of waste magnetic tape 8 Cutting tool 8 ₁ Blade edge of cutting tool 9 Waste magnetic tape of video tape 9 ₁ Tape surface of waste magnetic tape 10 Roller 10 ₁ Roller shaft 11 Roller 11 ₁ Roller shaft 12 Waste magnetic tape of audio tape 12 ₁ Tip side of waste magnetic tape 12 ₂ Part located between two rollers of waste magnetic tape

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Masayuki Inoue 60-11 Wada-cho, Yonago-shi, Tottori Examiner Yutaka Nakamura (56) References JP-A-7-9447 (JP, A) JP-A-62-204906 (JP) JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B 5/84-5/858 B02C 18/44 B09B 3/00

Claims (4)

(57) [Claims] 1. A waste magnetic tape, wherein the waste magnetic tape is cut or crushed to a length of 1 to 50 mm after shrinking deformation is applied to the waste magnetic tape, thereby making the waste magnetic tape into a cut or crushed material in a curl shape. Processing method. 2. The waste magnetic tape is pulled by rubbing the tape surface against the peripheral surface of a heated pin.
2. The method for treating waste magnetic tape according to claim 1, wherein shrinkage deformation is applied to the waste magnetic tape. 3. The method for treating waste magnetic tape according to claim 1, wherein the waste magnetic tape is subjected to contraction deformation by pulling the waste magnetic tape while pressing the tape surface against the cutting edge of the blade. 4. A screw co the two rollers at a predetermined distance
After the waste magnetic tape is wrapped around the axis of one roller and further wound around the axis of the other roller, at least one of the rollers is rotated to remove the waste magnetic tape. the portion located between the two rollers is strained by the tension and wherein the imparting contraction deformation to the waste tape according
Item 6. A method for treating a waste magnetic tape according to Item 1 .