JP2005343104A - Manufacturing process and manufacturing equipment for injection molding material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide equipment for manufacturing an injection molding material, capable of obtaining a material for injection molding by processing a waste magnetic tape by a simple method without the need of large-scale processing equipment. <P>SOLUTION: A waste magnetic tape 2 is crushed into a predetermined major axis length by a crusher 1 and compressed into lumps by a solidification compressor 3. The magnetic tape lumps and a flake-like PP 4 are in a predetermined ratio blended uniformly by a tumbler 5 and dried by a dryer 6. The dried resin pieces are introduced in an extruder 7 to heat and knead, and a string-like resin 21 extruded from a nozzle 72 is conveyed through a cooling water 82 in a cooling bath 8 and cut with a cutter 9 to obtain a pellet-form resin for injection molding (pellet 22). <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an injection molding material manufacturing method and manufacturing apparatus for reusing a resin-containing waste, such as a magnetic tape, as an injection molding material.

  Conventionally, landfilling or incineration has been performed to discard the magnetic tape. In the case of landfilling, it is no longer carried out due to the limited capacity of the landfill facility, but incineration is easily carried out as waste disposal because there is no generation of dioxins, which is a social problem. In addition, an incinerator is installed in various devices and facilities, and it is used as a heat source for thermal recycling, which helps to save energy. However, it is a problem because carbon dioxide is generated by incineration and promotes global warming.

  There are various techniques for removing the magnetic material applied to the magnetic tape so that the magnetic material can be reused. However, since the processing method is complicated, it has not been put into practical use because of its commercial value. Although the scale is small, commercially available magnetic tape can be reused by cutting the magnetic tape and then heat-pressing a large number of pieces of the magnetic tape to harden it into a plate shape. It has been commercialized by molding tatami cores.

In addition, as a plastic waste processing apparatus for reusing plastic waste and plastic defective products by heating and melting them into pellets, for example, the one described in Patent Document 1 below has been proposed.
Japanese Patent Laid-Open No. 7-205147

  Conventionally, as a reuse of magnetic recording tape cassettes, for example, magnetic recording tape cassettes collected from broadcasting stations are separated into parts, and parts made by injection molding such as cassette halves are crushed and mixed with virgin material, and the same parts again Alternatively, other completely different parts are injection molded. Increasing the ratio of the virgin material can improve the physical properties and is widely practiced.

  For example, when a pulverized part molded with a similar resin is mixed with PS (polystyrene) resin, the change in the ratio of virgin material (PS resin) and Izod impact strength is shown in FIG. According to FIG. 4, it can be seen that the strength decreases when the pulverized parts are mixed, and conversely, the Izod impact strength increases as the ratio of the virgin material increases.

  Although parts such as cassette halves thus separately collected are reused by waste treatment, there is no practical method and apparatus for reusing waste magnetic tape.

  In addition, as an initial treatment for treating waste such as magnetic tape, pulverization is performed to improve the handleability in volume reduction and reworking, but especially for the purpose of recycling, the particle size in pulverization is reduced. Control is required.

  As a method of pulverization, there are a shearing method and an impact method. In the shear type, the rotor has a blade, and the blade is used for shearing. The impact type is a method in which a hammer is attached to the rotor and pulverized by impact. Generally, plastic is crushed by a shearing method.

  The material of the plastic film is polyvinyl chloride, polyester, polyolefin, and the like. The thickness is defined as less than 0.25 mm in JIS, and a thin one is several μm. Since it is thin like this, the single body is weak and it is repelled from the blade at the time of crushing, and the efficiency of shearing is reduced. In addition, those having good slidability are less likely to be sheared due to lower friction, resulting in lower efficiency and difficulty in controlling the particle size. If pulverization takes a long time, heat is generated by friction, and those having low heat resistance are melted and need to be cooled.

  Therefore, only a pulverization process as an initial process of waste treatment requires complicated and large-scale equipment.

  The present invention has been made in view of the above points, and its purpose is not to require a large-scale processing facility, and it is possible to obtain a material for injection molding by processing a waste magnetic tape by a simple method. The object is to provide a material manufacturing method and a manufacturing apparatus.

  The method for producing an injection molding material according to the present invention includes a drying step of drying a mixed material obtained by mixing a first material having a resin layer and a magnetic layer and a second material having a thickening action. And a heating and kneading step of introducing the dried mixed material, heat-kneading, obtaining a semi-molten material and deriving it, conveying the semi-molten material derived in the heat-kneading step, cooling and injection molding It is characterized by obtaining materials for use.

  In addition, a crushing step of crushing the first material into a predetermined long axis length is provided.

  Further, the present invention is characterized by comprising a compression step of compressing a plurality of pieces of the first material crushed in the crushing step into a lump of a predetermined weight.

  The heating temperature in the heating and kneading step is characterized by being set to a temperature 20-30% lower than the melting point of the resin of the first material.

  Further, the present invention is characterized by comprising a laminating step of laminating a plurality of one material having a resin layer and a magnetic layer to form the first material.

The laminating step is characterized by laminating with a liquid interposed.
The first material is a coating type magnetic tape or a vapor deposition type magnetic tape.

 The apparatus for producing an injection molding material according to the present invention also includes a drying method for drying a mixed material obtained by mixing a first material having a resin layer and a magnetic layer and a second material having a thickening action. And a heating and kneading means for introducing and drying the dried mixed material to obtain a semi-molten material, and transporting, cooling, and injecting the semi-molten material derived by the heating and kneading means It is characterized by obtaining molding materials.

 Further, the present invention is characterized by comprising crushing means for crushing the first material to a predetermined long axis length.

 Further, the present invention is characterized by comprising compression means for compressing a plurality of pieces of the first material crushed by the crushing means into a lump of a predetermined weight.

 Further, the heating temperature in the heating and kneading means is set to a temperature lower by 20 to 30% than the melting point of the resin of the first material.

 The first material is characterized by being formed by laminating a plurality of one material having a resin layer and a magnetic layer.

 The first material is characterized in that it is formed by laminating a plurality of one material having a resin layer and a magnetic layer with a liquid interposed therebetween.

 The first material is a coating type magnetic tape or a vapor deposition type magnetic tape.

 More specifically, the first material is a fine piece obtained by crushing a coating type magnetic tape or a vapor deposition type magnetic tape into 2 to 10 mm squares and separating them one by one. In addition, by compressing the crushed material while heating in a container, the bulk density of the small pieces is increased, thereby enabling to supply from the hopper of the molding machine (heating kneading means) to the cylinder of the molding machine with high filling efficiency. .

  The crushed material has a two-layer structure of, for example, a magnetic layer made of polyurethane and a magnetic material and a base layer made of PET resin, and is chemically treated to mix them uniformly. First, a material called an extruder is used, and a material is produced by a mechanical method of rotating and kneading a screw while heating.

  Moreover, when kneading the crushed material using an extruder, the set temperature of the extruder cylinder is not adjusted to the highest PET resin among the resin materials kneaded as usual, Also, the temperature is set to 20 to 30% lower, and the temperature of the cylinder rises to the melting point of the PET resin by the heat of reaction between the metal magnetic material and oxygen during kneading, thereby obtaining a uniform kneading state.

  In addition, after kneading with the above-mentioned extruder, it is necessary to pass a semi-molten resin extruded in, for example, a string shape through cooling water, for example, to a cutter for processing into a pellet shape, but a resin kneaded with magnetic tape Since the viscosity of the component alone is low and cannot be drawn, pellets or flakes, PS resin, ABS resin, PP resin, PE resin, PC resin, PA resin, or PET resin Viscosity was increased by adding a thickening material for the purpose, and it was possible to process into pellets.

(1) According to the present invention, it is possible to prevent the resin of the first material contained in the mixed material, for example, polyethylene terephthalate (hereinafter referred to as PET) from being hydrolyzed during heating and kneading. Therefore, an injection molding material having high physical properties can be obtained.

  Further, when the viscosity of the semi-molten material derived from the heating and kneading step (means) is low, for example, it is difficult to transport to the cooling tank, but in the present invention, the first material and the thickening action are Since the second material to be played is mixed, the viscosity of the semi-molten material increases and it becomes easy to convey.

  In addition, the heating and kneading can be performed by, for example, an extruder, which is a mechanical means for rotating and kneading a screw while heating, and no chemical treatment is performed.

Further, when the waste magnetic tape is used as the first material, the waste magnetic tape can be used effectively, and the treatment by incineration is not required, so that the generation of carbon dioxide can be prevented. In addition, the landfill process becomes unnecessary due to the effective use of the waste magnetic tape. In addition, the amount of new resin made from petroleum, a depleted resource, can be reduced. In addition, resin for injection molding can be obtained from waste magnetic tape with minimal energy and processing time. In addition, recycled material can be used as the second material instead of a new material, thereby realizing effective use of resources.
(2) Further, according to the inventions according to claims 2 and 10, since the first material is crushed to a predetermined long axis length, the mixed material is heated and kneaded, for example, reliably introduced into an extruder. can do. This significantly improves processing efficiency.
(3) Further, according to the inventions according to claims 3 and 11, since the first material is made into a lump of a predetermined weight by compression, the mixed material is heated and kneaded. It can be smoothly introduced by dropping. This significantly improves processing efficiency.
(4) Moreover, according to invention of Claim 4, 12, even if it does not set the temperature at the time of heat-kneading high to the melting temperature of the resin of the first material, for example, PET, the first material PET can be melted by the reaction heat between the metal magnetic substance of the magnetic layer and oxygen. For this reason, it is possible to prevent the resin around the metal magnetic body from being carbonized due to heat kneading, for example, the temperature in the extruder becomes high.
(5) According to the inventions of claims 5 and 13, since the first material is formed by laminating a plurality of one material, the rigidity is increased and the waist is increased. The efficiency when crushing is significantly improved.
(6) According to the inventions of claims 6 and 14, by mixing the intervening liquid, mixing of foreign components in the first material can be easily eliminated. Thereby, an injection molding material having high physical properties can be obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows the overall configuration of an embodiment of the present invention. In FIG. 1, 1 is a crusher (crushing means) that crushes the discarded magnetic tape 2 (first material).

  3 is a solidification compressor (compression means) led out from the outlet 11 of the crusher 1 by heating and compressing the crush pieces of the magnetic tape 2 into a lump. Reference numeral 4 denotes flaky polypropylene (hereinafter also referred to as PP) as the second material.

  The magnetic tape 2 and the polypropylene 4 compressed into a mass by the solidification compressor 3 are introduced into the tumbler 5 (stirrer) at a predetermined ratio. The tumbler 5 stirs the introduced bulk magnetic tape 2 and polypropylene 4 and mixes them uniformly.

  6 is a dryer (drying means) for drying the resin pieces obtained by uniformly mixing with the tumbler 5. The resin piece dried by the dryer 6 is introduced into the hopper 71 and then introduced into the extruder 7 as a heating and kneading means.

  A semi-molten, string-like (strand) resin 21 is extruded from a nozzle (extrusion port) 72 of the extruder 7, and the resin 21 is passed through cooling water 82 circulated in the cooling bath 8 by a plurality of rollers 83. It is conveyed to the cutter 9.

  The conveyed resin 21 is cut into pellets 22 by the cutter 9 and stored in the bag 100.

  In the apparatus configured as described above, the first problem is that the magnetic tape 2 having a double structure of a magnetic layer made of polyurethane and magnetic material and a base layer made of PET resin is very thin. A single body is weak and has a problem that when it is crushed and crushed by the crusher 1, it is repelled from the blade and the efficiency of shearing is reduced.

  In addition, a material having good slidability has reduced friction and becomes difficult to shear, and the efficiency is lowered, making it difficult to control the particle size. If pulverization takes a long time, heat is generated by friction, and those having low heat resistance are melted and need to be cooled.

  Therefore, in the present invention, as shown in FIG. 2, a plurality of magnetic tapes 23 a to 23 n (23 a to 23 c in FIG. 2) are stacked to give rigidity before being put into the crusher 1. The thickness when overlapped is determined by the material of the films of the magnetic tapes 23a to 23c, the performance of the crusher 1, and the like.

  In general, since the plastic is an insulating material, it can be easily charged and the magnetic tapes can be bonded to each other by static electricity. Further, in the case where adhesion by static electricity is impossible with a conductive film or the like, adhesive materials 24a and 24b such as water or alcohol are interposed between the magnetic tapes 23a to 23c to improve adhesion and bond. Since these can be removed by evaporation, they are also suitable when it is desired to eliminate mixing of different components. Also, a cooling effect can be expected.

  Moreover, when there is no big restriction | limiting especially in a component, or when it is difficult to adhere magnetic tapes, you may adhere with a binder.

  As described above, by laminating the magnetic tape before being put into the crusher 1, the rigidity increases and the waist becomes stronger, so that the crushing and shearing efficiency is improved. In addition, since operation and processing are performed on the magnetic tape side to be crushed and crushed, the range of selection of the crusher and pulverizer is widened.

  In order to perform injection molding using the discarded magnetic tape 2 as a material, it is first necessary to stably supply a thin and light tape into the injection molding machine. Magnetic tape discarded during the production process of magnetic tape is more than 10 times wider than video tapes and audio tapes on the market, and the length is considerably longer. There is a possibility of entanglement, and it is not possible for the hopper to fall by its own weight into the injection molding machine, and as a result, injection as an injection molding material is impossible.

  Even if it can be introduced, the magnetic tape has a two-layer structure consisting of a magnetic layer made of polyurethane and magnetic material and a base layer made of PET resin. Is likely to be very low.

  In order to make the magnetic tape 2 having a two-layer structure of a magnetic layer made of polyurethane and a magnetic material and a base layer made of a PET resin uniformly mixed, the resin was melted by heating. It is considered desirable to knead while applying pressure in the state.

  Therefore, the extruder 7 was used to uniformly mix the polyurethane and magnetic material constituting the magnetic layer and the PET resin constituting the base.

  The second problem in the above apparatus is that, in order to put the discarded magnetic tape 2 into the extruder 7, it is necessary to make the projection area of the molding resin pellets usually put into the injection molding machine equal to or less than the same. That is. This is because the magnetic tape put into the hopper does not fall from the hopper outlet.

  Therefore, the discarded magnetic tape 2 was crushed using the crusher 1. The crushed pieces are determined by the shape of the blades of the crusher 1 and the size of the meshes provided at the outlet 11 of the crusher.

  In the present embodiment example, the major axis length of the crushed pieces was set to be between 2 mm and 10 mm. By doing so, the magnetic tape can be put into the extruder 7 from the hopper 71. This time, a device with a processing capacity of 350 kg per hour was used.

  Next, since the crushed pieces of the magnetic tape do not fall smoothly into the extruder 7, filling failure occurs in the extruder 7, and the crushed pieces of the magnetic tape only rotate around the extrusion screw. Not extruded.

  For this reason, the shredded pieces of magnetic tape are heated and compressed by the solidification compressor 3 to form a plurality of shredded pieces into a compressed lump, thereby increasing the bulk density and increasing the weight of the lump per hopper 71. To fall into Extruder 7 from its own weight. Thereby, it can supply with high filling efficiency from the hopper 71 into the cylinder of the extruder 7. In this embodiment, a solidification compressor having a processing capacity of 200 kg per hour was used.

  The third problem is that the viscosity of the resin extruded from the extruder 7 is low. The string-like semi-molten resin 21 called a strand extruded from the extruder 7 must be immediately solidified in the cooling bath 8 and cut into pellets 22 by the cutter 9, but it is cooled when the viscosity is low. The tank 8 cannot be drawn and cannot be pelletized.

  As a solution, in this embodiment, the viscosity could be increased by adding flaky PP (polypropylene) 4 as shown in FIG. The size of the flakes used in this embodiment is about 10 mm square or less. In order to add these, it is efficient to use a stirrer (5) called a tumbler as shown in FIG. In the present embodiment, the one having a capacity of 400 liters was used, and 25 kg of magnetic tape 2 and PP4 to be added were mixed at a ratio of 9: 1, 5: 5, 1: 9. At this weight, the volume was about 15 liters. Each ratio of the resins was stirred for 30 minutes so that they were mixed uniformly.

  In this embodiment, PP resin is used as the second material. However, the present invention is not limited to this, and PS resin, ABS resin, PP resin, PE resin, PC resin, PA resin is not limited to this. The addition of a resin or a thickener for PET resin is also effective, and it is considered that the resin to be added should be selected according to the required characteristics.

  Further, as a fourth problem, PET constituting the magnetic tape is easily hydrolyzed, and if it is hydrolyzed during kneading in the extruder 7, there is a problem that the physical properties of the obtained recycled resin are lowered. . Therefore, in the present invention, as shown in FIG. 1, the resin pieces uniformly mixed by the tumbler 5 were dried using the dryer 6. In the experiment of the present embodiment, the mixture mixed at each ratio was dried for 4 hours.

  The fifth problem is carbonization of the resin due to the generation of reaction heat in the extruder 7 of the magnetic tape. Since the magnetic tape 2 used in the present embodiment uses a metal magnetic material, when the set temperature of the extruder 7 is set to around 260 ° C., which is the melting point of PET, the polyurethane forming the magnetic layer is melted and becomes metal. The magnetic substance reacts with oxygen, the temperature inside the extruder 7 becomes high, and the resin around the metal magnetic substance is carbonized.

  The carbonized resin accumulates in a wire mesh filter provided inside the nozzle 72 serving as an extrusion port of the extruder 7 to cause clogging, and the molten resin cannot be extruded.

  As a solution to this problem, by setting the cylinder setting temperature of the extruder 7 to 20 to 30% lower than 260 ° C., which is the melting point of PET, the PET could be melted by the heat of reaction between the metal magnetic material and oxygen. . In the experiment of the present embodiment, the compression ratio is 2, and the rotational speed of the screw that is rotatably mounted in the extruder 7 for extruding while kneading the resin inside the extruder 7 is 120 revolutions per minute. Met.

  In order to make the semi-molten resin 21 extruded from the extruder 7 into a pellet shape, the resin is passed through the cooling bath 8 and then cut into pellets 12 by a cutter 9. In the cooling tank 8, cooling water 82 of approximately 20 ° C. circulates in a water tank 81 so that the string-like resin 21 extruded from the extruder 7 can be pulled to the cutter 9 without applying tension. A plurality of rollers 83 are disposed on the surface. In the experiment of this embodiment, the speed when the resin 21 passes through the cooling water was about 1 m per second.

  As described above, by implementing the first to fifth solutions, the injection molding resin pellets 22 could be obtained from the magnetic tape 2.

The flow of the processing steps in the above embodiment is summarized as shown in FIG. In FIG. 3, steps S ₁ to S ₃ represent processing steps until the magnetic tape 2 of FIG. 1 is crushed by the crusher 1 and compressed into a lump with the solidification compressor 3, and steps S ₄ to S S ₆ shows processing steps for obtaining a flaky PP4 was treated by the same method as the example steps S ₁ ~ step S ₃ PP4.

Note that steps S ₁ and S ₄ in FIG. 3 show a process of obtaining a waste magnetic tape and a resin member. In this process, for example, the above-described lamination process as shown in FIG. 2 is appropriately performed. Steps S ₇ to S ₁₂ in FIG. 3 represent processing steps performed in the tumbler 5, the dryer 6, the extruder 7, the cooling tank 8, and the cutter 9 in FIG. 1.

  Since the polyurethane contained in the magnetic tape 2 has no influence on physical properties, it is possible to make an injection molding resin by the above-described manufacturing method even for a vapor deposition tape that does not constitute a magnetic tape using polyurethane as a binder.

  FIG. 4 shows the relationship between the ratio of the other resin (PP4) mixed to increase the viscosity contained in the recycled resin (pellet 22) made according to the present invention and the Izod impact value indicating the strength.

  In FIG. 4, in the present embodiment in which the weight ratio of the magnetic tape 2 and PP4 is three types of 10:90 (shown a), 50:50 (shown b), and 90:10 (shown c), they are mixed together. As the ratio of PP4 increases, the Izod impact value increases (strength increases and resistance to breakage). Conversely, as the PP4 ratio decreases, the strength decreases (becomes fragile), and when the weight ratio of the magnetic tape 2 to PP4 is 90:10 (c in the figure), the strength is at the practical limit.

  Next, using the injection molding resin obtained from the magnetic tape 2 and PP4 as described above, a normal injection molding machine was used and molding was performed under the molding conditions shown in Table 1 below.

  The mold used was for molding a flower pot designed for PP having the shape and outer dimensions shown in FIG. 5, and the mold was not particularly modified.

  The molding temperature of normal PP is 180 ° C., but when molding is performed using an injection molding resin made from the magnetic tape of the present invention, it is performed at 200 ° C. This is because when the temperature is 180 ° C., the PET of the magnetic tape is not sufficiently melted and the crushed pieces of the magnetic tape remain in a visible state.

  Moreover, although the mold temperature is usually 45 ° C., the injection molding resin made from the magnetic tape of the present invention is set to 50 ° C. to improve the appearance defect.

  Since the molding cycle was a hand-made mold, each sample took 40 seconds per sample, and there was no significant difference.

  When the weight ratio of the magnetic tape and PP is 50:50 and 90:10, silver (silver strip) is slightly generated, and it is necessary to raise the molding temperature a little or lengthen the drying time.

  The ratios conducted in the experiments of the present embodiment are not limited to these, and in order to improve the characteristics, fine setting of the addition ratio and adjustment of the molding conditions are arbitrarily performed.

  As described above, according to the present embodiment, it is possible to obtain the material for injection molding by processing the waste magnetic tape by a simple method without requiring a large-scale processing facility.

1 is an overall configuration diagram of an embodiment of the present invention. The lamination process in one embodiment of this invention is represented, (a) is a principal part perspective view of a lamination magnetic tape, (b) is sectional drawing of a lamination magnetic tape. The flowchart showing the process process in one embodiment of this invention. The characteristic view which shows the relationship between the ratio of the 1st material in the example of 1 embodiment of this invention, and the 2nd material, and an Izod impact value. The injection mold which performs injection molding using the resin manufactured by the example of one embodiment of the present invention is represented, (a) is a plane schematic diagram and (b) is an important section sectional view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Crusher, 2,23a-23c ... Magnetic tape, 3 ... Solidification compressor, 4 ... Polypropylene, 5 ... Tumbler, 6 ... Dryer, 7 ... Extruder, 8 ... Cooling tank, 9 ... Cutter, 21 ... Resin, 22 ... pellet, 23 ... laminated magnetic tape, 24a, 24b ... adhesive material, 71 ... hopper, 72 ... nozzle, 81 ... water tank, 82 ... cooling water, 83 ... roller, 100 ... bag.

Claims (16)

A drying step of drying a mixed material formed by mixing a first material having a resin layer and a magnetic layer and a second material having a thickening action;
A heating and kneading step of introducing the dried mixed material and heating and kneading to obtain and derive a semi-molten material;
A method for producing an injection molding material, wherein the semi-molten material derived in the heating and kneading step is conveyed and cooled to obtain an injection molding material.   The method for producing an injection molding material according to claim 1, further comprising a crushing step of crushing the first material into a predetermined long axis length.   The method for producing an injection molding material according to claim 2, further comprising a compression step of compressing a plurality of pieces of the first material crushed in the crushing step into a lump of a predetermined weight. .   2. The method for producing an injection molding material according to claim 1, wherein the heating temperature in the heating and kneading step is set to a temperature 20 to 30% lower than the melting point of the resin of the first material.   2. The method of manufacturing an injection molding material according to claim 1, further comprising a laminating step of laminating a plurality of one material having a resin layer and a magnetic layer to form the first material. .   6. The method for manufacturing an injection molding material according to claim 5, wherein the laminating step is performed by interposing a liquid.   The method of manufacturing an injection molding material according to claim 1, wherein the first material is a coating type magnetic tape.   The method for manufacturing an injection molding material according to claim 1, wherein the first material is a vapor deposition type magnetic tape. A drying means for drying a mixed material obtained by mixing a first material having a resin layer and a magnetic layer and a second material having a thickening effect;
A heating and kneading means for introducing the dried mixed material and heating and kneading to obtain and derive a semi-molten material;
An apparatus for producing an injection molding material, wherein the semi-molten material derived by the heating and kneading means is conveyed and cooled to obtain an injection molding material.   The apparatus for producing an injection molding material according to claim 9, further comprising crushing means for crushing the first material into a predetermined major axis length.   The apparatus for producing an injection molding material according to claim 10, further comprising compression means for compressing a plurality of pieces of the first material crushed by the crushing means into a lump of a predetermined weight. .   The apparatus for producing an injection molding material according to claim 9, wherein the heating temperature in the heating and kneading means is set to a temperature that is 20 to 30% lower than the melting point of the resin of the first material.   10. The apparatus for manufacturing an injection molding material according to claim 9, wherein the first material is formed by laminating a plurality of one material having a layer made of a resin and a magnetic layer.   10. The material for injection molding according to claim 9, wherein the first material is formed by laminating a plurality of one material having a resin layer and a magnetic layer with a liquid interposed therebetween. Manufacturing equipment.   10. The injection molding material manufacturing apparatus according to claim 9, wherein the first material is a coating type magnetic tape. The said first material is a vapor deposition type magnetic tape, The manufacturing apparatus of the material for injection molding of Claim 9 characterized by the above-mentioned.

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