JP4154199B2 - History granulation method, history granulation apparatus and history granulation system of synthetic resin - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a synthetic resin hysteresis granulation method, a hysteresis granulation method for granulating a pulverized flake obtained by pulverizing a stretched ultrathin thermoplastic synthetic resin film or an ultrafine thermoplastic synthetic resin fiber into a spherical shape for recycling. The present invention relates to an apparatus and a history granulation system.
[0002]
[Prior art]
In order to recycle a synthetic resin product, it is necessary to pulverize and granulate the product so that it is not bulky and easy to handle, and has a shape suitable as a molding material.
[0003]
As a granulating apparatus for this recycling, for example, the apparatus described in Patent Document 1 has been proposed, and the apparatus is shown in FIG.
[0004]
The granulating apparatus 120 includes a processing tank 101 for processing a synthetic resin product, a rotating shaft 102 provided through the bottom of the processing tank 101, and an electric motor that rotationally drives the rotating shaft 102 via a V-belt. 103, the blade body 104 installed on the rotating shaft 102, the rotary blade body 105 provided on the rotating blade body 104, and opposed to the processing tank 101 with a predetermined clearance from the rotary blade body 105. A fixed blade 106 is provided.
[0005]
A supply port 107 that supplies liquid or powder to the inside of the processing tank 101 is provided above the processing tank 101, and a supply source 114 is connected to the supply port 107 via an electromagnetic valve 113. . The electromagnetic valve 113 is opened and closed by a signal from a temperature sensor 108 provided in the middle of the processing tank 101.
[0006]
A collar 109 is inserted between the base of the rotating shaft 102 and the blade body 104, and by adjusting the thickness of the collar 109 in various ways, a gap between the rotating blade body 105 and the fixed blade body 106 is formed. Can be adjusted.
[0007]
The treatment tank 101 is further provided with an outlet 110 for granulated granules, an openable / closable lid 111, and a cooling jacket 112 on the outer periphery.
[0008]
With such a configuration, according to the granulating apparatus 120, scrap material such as a synthetic resin film or a molded product is spun up by the blade body 104 while being crushed by the rotary blade body 105 and the fixed blade body 106, When the surface of the crushed pieces becomes semi-gelled and rounded by frictional heat, the temperature of this state is detected by the temperature sensor 108, and liquid or powder is supplied from the supply port to form semi-gelled. The surface of the crushed pieces was rapidly cooled and fusion between the crushed pieces was prevented, and the crushed pieces could be granulated.
[0009]
However, in this granulating apparatus, a very thin thermoplastic synthetic resin film having a thickness of 1 μm to 100 μm and a very thin thermoplastic synthetic resin fiber having a fiber diameter of 1 μm to 100 μm could not be suitably granulated. Further, Patent Documents 2 and 3 relating to the improvement of the granulation apparatus have been proposed by the same applicant, but none of them has been able to solve this problem.
[0010]
In other words, such very thin thermoplastic synthetic resin films and very thin thermoplastic synthetic resin fibers are very bulky and have a low apparent density, and are therefore very difficult to handle. Compared to the progress of granulation and recycling of synthetic resin products such as PET bottles, which have a high apparent density, using granulators, recycling has not progressed so far.
[0011]
On the other hand, ultra-thin films occupy a significant part of synthetic resin products, and most of synthetic resin fibers fall into this category. When these recyclings are achieved, the recycling rate of the entire synthetic resin products A significant improvement is expected.
[0012]
In view of such a problem, the present applicant has developed a method and apparatus for granulating a very thin thermoplastic synthetic resin film and a very thin thermoplastic synthetic resin fiber (hereinafter referred to as “thin product”). I have tried variously.
[0013]
A) One method is a method of cutting a thin product with a pulverizer. In this method, a thin product is pulverized, for example, by passing it through a perforated plate having a diameter of 3 mm, whereby the apparent density ρF = 0.102 g / ml to 0.020 g / ml of the thin product before processing is obtained. The apparent density ρF = 0.05 g / ml, and the apparent density was improved by 4 to 2.5 times.
[0014]
However, the pulverized flakes produced in this way have poor flow discharge properties in a hopper, etc., often cause a blockage phenomenon in which the flakes are connected to block the passage, and as a material for the molding machine, The bite into the screw was bad and not suitable.
[0015]
B) Another method is a method in which the pulverized flakes thus produced are mixed with synthetic resin pellets (for example, those having an apparent density ρF = 0.56 g / ml). According to this, when the mixing ratio of pellets was 80%, the overall apparent density ρF = 0.184 g / ml could be achieved, and the fluidity in the hopper was also improved.
[0016]
However, when such a mixture is operated for a long period of time, the difference in the apparent density between the pulverized flakes and the synthetic resin pellets is large, so there is a problem that phase separation tends to occur and becomes unstable. Was something that should be resolved.
[0017]
C) Still another method is a method in which the pulverized flakes thus produced are subjected to heat shrinkage by external heating, and more specifically, a polyethylene film having a thickness of 10 μm to 20 μm is pulverized in the same manner as in A). The pulverized flakes are pulverized by a machine to be pulverized flakes, and then the pulverized flakes are heated to a predetermined temperature by external heating and subjected to heat shrink granulation.
[0018]
When an infrared lamp is used as an external heating means, the apparent density increased by 3.6 times due to thermal shrinkage, but the grain shape was not spherical but had an acute edge shape, and the grains were connected in a tandem shape. The fluidity between particles was not good. This was considered because heat transfer was not performed uniformly.
[0019]
As a method of performing heating more uniformly, a pulsating fluidized bed dryer was used as an external heating means, and the pulverized flakes were heated with pulsating hot air. In this case, the apparent density increased twice, but as above, the particle shape was not spherical but had an acute edge shape, and the particles tended to be connected in a tandem shape, The fluidity was not good.
[0020]
On the other hand, in this heating method, there was little adhesion between particles due to the influence of pulsating hot air, but unless the air volume was reduced, particle shrinkage could not be promoted, resulting in contradictory conditions, and particles were uniformly and independently Shrink granulation could not be performed, and it was not possible to prevent the occurrence of a clogging phenomenon near the hopper discharge port.
[0021]
However, the result of heat shrinkage by this heating method demonstrated the hypothesis that when the ground flakes are heated to the drawing processing temperature at which the original thin product was produced, the history shrinks due to its history.
[0022]
[Patent Document 1]
JP 48-64552 A (FIGS. 1 and 2)
[Patent Document 2]
JP-A-48-97150 (FIGS. 1 and 2)
[Patent Document 3]
JP-A-48-97151 (FIGS. 1 and 2)
[Problems to be solved by the invention]
The present invention is proposed in view of the above-described situation, and more effectively utilizes heat shrinkage due to the history of which the effectiveness of the present inventors has been confirmed by trials of the present inventor. It is an object of the present invention to provide a synthetic resin history granulation method, history granulation apparatus, and history granulation system that can be recycled.
[0023]
[Means for Solving the Problems]
  The hysteresis granulation method for synthetic resin according to claim 1 is the effective diameter or effective for a stretched thermoplastic synthetic resin film having a thickness of 1 to 100 μm or a thermoplastic synthetic resin fiber having a fiber diameter of 1 to 100 μm.Length 1.2mm to 3mmThe crushed crushed flakes are fed to a longitudinal cylindrical heat shrink tank., By controlling the rotation speed of the stirring blades arranged concentrically in the upper and lower stages in the history heat shrink tank, the supplied pulverized flakes are stirred and heated up to the stretching processing temperature,By this history heat shrinkage, the crushed flakesAbbreviated sphereIt is characterized by being granulated into a shape.
[0024]
This granulation method is characterized in that the granulation object is first made into an ultrathin thermoplastic synthetic resin film or ultrafine thermoplastic synthetic resin fiber (thin product). With conventional granulation methods, products with a high apparent density could be granulated, but the thin products targeted here are bulky, with a low apparent density, difficult to handle, and have blockage and poor fluidity. Although granulation was difficult, these problems were solved by improving the pulverization shape and granulation method, thereby enabling granulation.
[0025]
One of the features of the solution is that the thin product is ground flakes ground to an effective diameter or an effective length of 3 mm or less. As a result, it was found that this pulverized flakes have just the right sphericity in combination with the hysteresis heat shrinkage described later, and the problems of handling the above thin products, apparent density, fluidity, blockage, and suitability as a molding machine material. It was solved.
[0026]
Another feature is that the ground flakes are heated to the drawing processing temperature. This stretch processing temperature was originally used as the processing temperature for stretching when the thermoplastic synthetic resin film and the thermoplastic synthetic resin fiber were produced. When the drawing processing temperature is restored, thermal shrinkage occurs to return to the original state before drawing due to the hysteresis phenomenon of the material. This phenomenon is called hysteresis heat shrinkage.
[0027]
Since the drawing temperature is lower than the melting temperature of the material of the thin product, there is no problem of fusion due to melting of the heated crushed flakes, but the crushed flakes are each thermally contracted alone. Only.
[0028]
Further, the pulverized flakes are heated not by external heating but by the frictional heat between the stirring blades and the pulverized flakes generated by the stirring by the stirring blades and the frictional heat between the pulverized flakes. As a result, the pulverized flakes are uniformly heated, and the whole is uniformly heat-shrinked and granulated without local high temperature due to the offset of the heat generated during external heating, resulting in melting of the flakes and mutual welding. . Moreover, according to this method, the controllability of temperature is also good.
[0029]
In addition, it is considered that the fact that this stirring blade is configured in multiple stages in accordance with the shape of the vertically long history heat shrink tank also contributes to uniform heating. This is because bulky pulverized flakes are not easily affected by the acceleration of gravity, and it is better to have more opportunities for contact with the stirring blades in a hysteresis heat shrink tank formed in a long direction with respect to gravity.
[0030]
  The hysteresis granulating apparatus for a synthetic resin according to claim 2 is an effective diameter or an effective diameter of a stretched thermoplastic synthetic resin film having a thickness of 1 to 100 μm or a thermoplastic synthetic resin fiber having a fiber diameter of 1 to 100 μm.Length 1.2mm to 3mmA synthetic resin history granulating device for granulating pulverized pulverized flakes into a spherical shape, receiving a supply of pulverized flakes, collecting the pulverized flakes and supplying them to an intermediate collection tank, and a clogging prevention device The intermediate collection tank that supplies the history heat shrink tank without clogging the pulverized flakes supplied from the fine powder collection tank, and a stirring blade that is vertically long and concentrically arranged insideRotateThe history heat shrink tank toA thermometer that measures the temperature of the ground flakes in the history heat shrink tank,A cooling mixer that cools and discharges the granulated pulverized flakes discharged from the history heat shrink tank at a predetermined temperature.By controlling the number of revolutions of the stirring blades arranged concentrically in the vertical direction,Ground flakes supplied from the intermediate collection tank, While measuring the temperature of the crushed flakes with the thermometer,Stretching temperatureIncrease the temperature toBy this history heat shrinkage, the crushed flakesAbbreviated sphereIt is characterized by being granulated into a shape.
[0031]
This granulating apparatus is an apparatus for realizing the granulating method according to claim 1, and is a fine powder collecting tank for handling pulverized flakes, an intermediate collecting tank equipped with a blocking prevention device, and a hysteretic heat shrinking tank for carrying out hysteretic heat shrinking. And a cooling mixer, and the supplied ground flakes can be granulated and discharged in a stable state.
[0032]
  The hysteresis granulation system for synthetic resin according to claim 3 is an effective diameter or effective for a stretched thermoplastic synthetic resin film having a thickness of 1 to 100 μm or a thermoplastic synthetic resin fiber having a fiber diameter of 1 to 100 μm.Length 1.2mm to 3mmThe history granulation according to claim 2, wherein the pulverization apparatus pulverizes the pulverized flakes thus produced, the quantitative discharge apparatus for quantitatively discharging the pulverized flakes thus generated, and the history granulation of the pulverized flakes quantitatively discharged from the quantitative discharge apparatus. DressAnd moreIt is characterized by being made.
[0033]
  In addition to the granulating apparatus according to claim 2, the granulating system further includes a pulverizing apparatus that generates predetermined pulverized flakes, and a quantitative discharge device that quantitatively discharges the pulverized flakes to the granulating apparatus. If you put in a thin product to be recycled,ProperThe particulate thermoplastic synthetic resin is discharged almost automatically.
[0034]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0035]
FIG. 1 is a configuration diagram showing an example of a synthetic resin hysteresis granulator according to the present invention.
[0036]
This history granulating device 50 is a central device for realizing the synthetic resin history granulating method of the present invention, and the main parts are an intermediate collection device equipped with a fine powder collection tank 6 and an occlusion prevention device 8. A history heat shrink tank 11 having a tank 9 and a stirring blade 13 is stacked in multiple stages from top to bottom, and a cooling mixer 16 is provided beside the history heat shrink tank 11.
[0037]
The fine powder collection tank 6 has an air port 1 that receives supply of pressurized air + P or suction air-P from the blower 2 by the operation of the switching valve 3 at the upper part, a filter 4 inside, and a lower side from the filter 4 mounting part. Are provided with a material inlet 5 and a discharge shutter 7 at the bottom.
[0038]
The intermediate collection tank 9 is directly connected to the lower part of the fine powder collection tank 6 and directly receives and accommodates the pulverized flakes F dropped from the discharge shutter 7. In addition, a leveler 10 is installed in the tank 9 and the amount of pulverized flakes F stored in the tank 9 is measured.
The agitation blade 13 of the hysteresis heat shrink tank 11 is belt-driven by an electric motor 12 installed in the vicinity of the hysteresis heat shrink tank 11 so as to rotate at a high speed in the tank 11.
[0039]
A thermometer 14 is discharged to a part of the peripheral wall which is the lower part of the multistage stirrer blade 13 of the hysteresis heat shrink tank 11, and the particulate matter S generated by heat shrinking the pulverized flakes F at a position facing the thermometer 14 is discharged. A discharge port 15 is provided.
[0040]
The cooling mixer 16 is configured to receive the granular material S discharged from the discharge port 15, a rotating blade 17 that cools the granular material S while stirring, an electric motor 18 that rotationally drives the rotating blade 17, A cooling outlet 19 for discharging the cooled granular material S is provided.
[0041]
Moreover, the code | symbol bF of the grinding | pulverization flake F shown in FIG. 1 has shown the effective diameter of this flake F, and the code | symbol tF has shown thickness. The symbol bS of the granular material S indicates the effective diameter of the historically granulated granular material S, and the symbol tS indicates the thickness.
[0042]
The granulation process in the history granulator 50 having such a configuration is as follows.
[0043]
1) Acceptance of ground flake F
First, pulverized flakes F that are raw materials are received. This pulverized flake F is obtained by pulverizing a thermoplastic synthetic resin film having a thickness of 1 μ to 100 μm or a thermoplastic synthetic resin fiber having a fiber diameter of 1 μ to 100 μ to an effective diameter or an effective length of 3 mm or less. And
[0044]
By switching the switching valve 3 of the blower 2, the suction air −P is supplied to the air port 1, and the prepared pulverized flake F is sucked and supplied to the material introduction port 5 by this suction force, and only the internal air is filtered 4. The pulverized flakes F are collected and stored in the fine powder collection tank 6. At this time, the discharge shutter 7 is closed.
[0045]
2) Charging flake F
When the leveler 10 detects that the pulverized flake F is less than a predetermined amount in the intermediate collection tank 9, the switching valve 3 is switched, and pressurized air + P is supplied to the air port 1, correspondingly. The discharge shutter 7 is opened, and the pulverized flakes F stored in the fine powder collection tank 6 are discharged to the intermediate collection tank 9. The check lid 5a provided inside the material introduction port 5 is pressed by the pressurized air + P to close the inside of the material introduction port 5 and prevent the pulverized flakes F from flowing back from here. .
[0046]
Here, the pulverized flakes F are likely to close, particularly when the intermediate collection tank 9 has a lower stagnation shape due to its functional requirements, but the hysteresis heat is not blocked by the action of the blocking prevention device 8. The shrinkage tank 11 is charged.
[0047]
3) Granulation by hysteresis heat shrinkage
The pulverized flakes F that have been charged are initially at room temperature, but are heated uniformly by the frictional heat between the blades 13 and the flakes F and the frictional heat between the flakes F by the high-speed stirring by the stirring blades 13 in the tank 11. Then the temperature rises. This temperature is constantly measured and managed by the thermometer 14.
[0048]
  This heat generation state varies greatly depending on the shape and size of the pulverized flakes F. In the case of the pulverized flakes F having the above dimensions and the material is polyethylene (PE), the peripheral speed of the stirring blade 13 is set to 20.m / secIn this case, it was possible to control the temperature rise to a temperature at which hysteresis heat shrinkage occurred in a work cycle of about 15 to 5 minutes.
[0049]
The target temperature in this case is the material stretching temperature, and when this temperature is reached, thermal contraction due to the history of the material that occurs with the stretching orientation occurs to the maximum extent. Further, the shrink granulation is performed instantaneously when the drawing processing temperature is reached.
[0050]
This temperature control can be performed stably and reliably by controlling the number of rotations of the stirring blades 13, and heat generation is performed very uniformly. There is nothing.
[0051]
Furthermore, since the drawing temperature is lower than the melting temperature of the material, there is no problem of welding due to melting of heated ground flakes.
[0052]
  In addition, since this history heat shrinkage shrinks in accordance with the drawing rate at the time of drawing processing, the shrinkage rate is equal to the drawing rate, and the size of the effective diameter of the pulverized flake F or the effective length of 3 mm or less is the shrinkage rate. Considering this, it is set so that the sphericity is improved after shrinkage.
[0053]
4) Cooling and taking out
When the discharge port 15 is opened, the contracted and granulated granular material S is discharged by the rotation of the stirring blade 13 and is put into the cooling mixer 16. Here, the granular material Z still having a high temperature is uniformly cooled by the rotation of the cooling blade 17, and its heat shrink deformation is stopped and fixed. In this way, the granular material S with good fluidity is generated, and when the cooling discharge port 19 is opened, the granular material S can be taken out.
[0054]
In addition, about the fine powder collection tank 6 mentioned above, according to the granular material collector proposed by this applicant (Unexamined-Japanese-Patent No. 2000-344348), the whole quantity of the pulverized flakes F after collection is discharged satisfactorily. Can allow automatic operation of quantitative acceptance and quantitative discharge.
[0055]
In addition, the blockage prevention device 8 is satisfactorily blocked according to those described in the powder storage tanks (Japanese Patent Laid-Open Nos. 10-310252, 11-165791, 165792, and 268792) proposed by the applicant. The total amount of the pulverized flakes F collected in the intermediate collection tank 9 can be put into the hysteresis heat shrink tank 11 without causing any trouble.
[0056]
FIG. 2 is a view showing a granulation test result table by the history granulation method of the synthetic resin of the present invention.
[0057]
This report shows a crushed flake F (T-1) obtained by mechanically cutting a polyethylene (PE) film having a product thickness of 17 μm and a material density of 0.92 g / ml and an effective diameter of 82 mm, and a porous plate having a crushed mesh of 6 mmφ. The test results in the case of three-dimensional pulverized flake F (T-2) and pulverized flake F (T-3) pulverized with a pulverized mesh 3 mmφ perforated plate under the respective conditions are shown. Is.
[0058]
The pore diameter of the pulverized mesh corresponds to the effective diameter of the pulverized flake F to be generated, and this effective diameter is expressed as bF. This effective diameter bF is also referred to as a disk equivalent diameter.
[0059]
Further, in this table, the equivalent granulated sphere diameter d is a sphere diameter when it is assumed that one target pulverized flake F is contracted and transformed into a complete sphere, and the sphericity RS is The surface area SS of the granular material S is divided by the equivalent spherical surface area Sd, and this equivalent spherical surface area Sd is Sd = π * d * d (the symbol “π” indicates the circumferential ratio, and “*” indicates multiplication). )).
[0060]
According to this, when the pulverized flakes F (T-3) pulverized with a pulverized mesh 3 mmφ perforated plate, that is, when the effective diameter bF = 3 mm, the spherical degree RS of the generated granular material S is 1.2. It has been a satisfactory result, which can be considered almost a sphere.
[0061]
In addition, as the thermoplastic synthetic resin film or thermoplastic synthetic resin fiber to be granulated by the history granulation method of the present invention, the following are suitable. In addition, the following is an illustration, In addition, if it is a thermoplastic synthetic resin film and fiber which satisfy | fill said shape, thickness, and a fiber diameter, it can granulate.
[0062]
LDPF (polyethylene inflation) film: material density 0.92 g / ml, apparent density 0.012 g / ml, average thickness 17μ
PP (polypropylene) stretched composite film: material density 0.90 g / ml, apparent density 0.025 to 0.050 g / ml, average thickness 116 μm
PP (polypropylene) fiber: material density 0.92 g / ml, apparent density 0.01 to 0.03 g / ml (fiber bundle shape), fiber diameter 0.563 to 26.60 μ (20.6 to 460 denier), stretched Temperature 130 ° C-135 ° C
Nylon 6 fiber: material density 1.145 g / ml, apparent density 0.015-0.025 g / ml (fiber bundle), fiber diameter 1.9-3.4 μ (288-950 denier)
PET (pet) fiber: material density 1.3717 g / ml, apparent density 0.025 to 0.048 g / ml (fiber bundle), fiber diameter 2.25 to 3.66 μ (495 to 1300 denier)
FIG. 3 is a graph showing the result of the granulation test by the hysteresis granulation method of the synthetic resin of the present invention. In addition to the test result of FIG. 2, the pore diameter of the pulverized mesh, that is, the effective diameter bF of the pulverized flake F is further increased. The change in the equivalent granulated sphere diameter d of the history granulated granular material S when it is finely changed is indicated by the solid line (bF / d) connecting the circles, and the equivalent granulated sphere diameter d of the granular material S A change in the sphericity RS of the granular material S corresponding to the value is indicated by a dotted line (RS) connecting X marks.
[0063]
The left side of the vertical axis of this graph is the effective diameter bF of the pulverized flakes F in units of cm, the right side is the sphericity RS of the granular material S, the horizontal axis is the equivalent granulated sphere diameter d of the granular material S, and the unit is cm. Yes. Also, in this graph, the spherical degree RS = 1.1 to 1.3 is filled with diagonal lines. This is because, if the spherical degree RS is within this range, the generated granular material is handled and the apparent density is It is shown that it is satisfactory in terms of fluidity, blockage and suitability as a molding machine material.
[0064]
Also from this graph, it is understood that when the effective diameter bF of the pulverized flakes F is 3 mm or less, good granulation is possible and a suitable granular material is obtained. Further, the lower limit of the effective diameter bF of the pulverized flakes F is found to be about 1.2 mm from this graph although there are physical restrictions.
[0065]
4A and 4B show the stirring blades used in the history granulator of FIG. 1, wherein FIG. 4A is a plan view thereof, and FIG.
[0066]
As shown in these figures, this stirring blade 13 is composed of an impeller 13b having two blade portions 13a extending in the opposite direction from the center in a multistage manner, in this case, four stages. Thus, this is in accordance with the cylindrical shaft length of the hysteresis heat shrink tank 11 which is a container in which the stirring blade 13 rotates at a high speed.
[0067]
Thus, it is thought that the point which comprised the stirring blade 13 in multistage according to the shape of the vertically long history heat shrink tank also contributed to uniform heating. This is because bulky pulverized flakes F are less susceptible to the acceleration of gravity, and it is better to have more opportunities for contact with the stirring blades 13 in the hysteresis heat shrink tank 11 formed in a long direction with respect to gravity. It is. Therefore, the number of stages is not limited to the four stages in this example, and is appropriately adjusted according to the length of the history heat shrink tank 11.
[0068]
The shape of the wing portion 13a is also composed of a gentle curve upward with respect to the direction of rotation, as in the case of an airplane wing, as can be seen from the external view of the uppermost one in FIG. 4 (b). Thus, the crushed flakes F can be satisfactorily agitated without causing an acute impact on the pulverized flakes F and generating a flow that always presses downward.
[0069]
FIG. 5 is a block diagram showing an example of a synthetic resin hysteresis granulation system according to the present invention, FIG. 6 is a block diagram showing the pulverization apparatus of FIG. 5 in more detail, and FIG. 7 is a block diagram of the quantitative discharge apparatus of FIG. It is a block diagram shown in detail.
[0070]
The history granulation system 80 supplies the history granulation apparatus 50 described with reference to FIG. 1 to the grinding apparatus 60 for producing the pulverized flakes F suitable for granulation by the apparatus 50, and supplies the pulverized flakes F to the apparatus 50. The quantitative discharge device 70 is provided, and a suitable granular material can be obtained semi-automatically only by inputting a thin product to be recycled.
[0071]
The pulverizing device 60 is installed so as to be substantially in contact with the rotating outer periphery of the apparatus main body 20, the pulverizing rotary cutter 21 rotating at high speed around the horizontal axis in the apparatus main body 20, and the pulverized flakes to be generated after pulverization. A perforated plate 22 having a large number of holes having a diameter corresponding to the effective diameter of F is provided.
[0072]
When a thin product is put into the apparatus main body 20 of the apparatus 60, the input is drawn by the rotation of the crushing rotary cutter 21, and passes through the holes of the perforated plate 22, thereby crushing flakes F having a predetermined effective diameter, for example, 3 mmφ. Is generated. The pulverized flakes F thus generated are stored in the storage tank 24 by the cyclone separator 23.
[0073]
The fixed amount discharge device 70 includes a stepped chute 25, a first iris shutter 26, a photoelectric leveler 27, a second choke valve shutter 28, a flake chute 29, and an aeration valve 30, and automatically pulverized flakes F, which are bulky and have a small apparent density. Can be quantitatively discharged.
[0074]
That is, when receiving the pulverized flakes F from the storage tank 24, the stepped chute 25 receives the pulverized flakes F satisfactorily introduced by the stepped structure and adjusts the opening / closing time of the first iris shutter 26. The flake F can be quantitatively discharged, and the discharge state is confirmed by the photoelectric leveler 27.
[0075]
Thus, after the amount is fixed, by opening the second choke valve shutter 28, the flake F is introduced into the flake chute 29, and the chute 29 is blown out by the jet air ejected from the multistage aeration valve 30 provided therein. As a result, a swirling jet is generated along the inner surface of the pipe, thereby causing the frictional resistance received from the pipe wall surface to be as much as possible, so that the pulverized flakes F are transported to the material inlet 5 of the history granulator 50 satisfactorily. .
[0076]
There are various configurations of such a quantitative discharge device 70. In particular, according to the granular material transport device proposed by the present applicant (Japanese Patent Laid-Open No. 2000-344346), the bulk and the apparent density are high. Small pulverized flakes F can be quantitatively transported satisfactorily.
[0077]
In this example of the system, the batch-type storage tank 24 is used as a means for transporting the pulverized flakes F between the pulverizer 60 and the fixed amount discharge device 70. The crushed flakes F may be transported by connecting with the provided pipeline.
[0078]
【The invention's effect】
According to the history granulation method of the synthetic resin according to the first aspect, it is possible to granulate a thin product, which has been conventionally difficult to achieve good granulation, by various means configurations.
[0079]
  One of the features of the solution is to make this thin product effective diameter or effective.1.2mm or more in length, 3It was found that the pulverized flakes were pulverized to less than mm, and that the pulverized flakes had an appropriate sphericity in combination with the hysteresis heat shrinkage described later, handling of the above-mentioned thin products, apparent density, fluidity, and occlusiveness. Solved the problem of suitability as a molding machine material.
[0080]
Another feature is that the pulverized flakes are heated to the drawing temperature, which is lower than the melting temperature of the material of the thin product. This problem does not occur, and the crushed flakes are merely thermally shrunk independently.
[0081]
Furthermore, since the frictional heat between the stirring blade and the pulverized flakes generated by the stirring by the stirring blades and the frictional heat between the pulverized flakes are utilized for heating the pulverized flakes, not by external heating, etc., the pulverized flakes are heated uniformly. The whole is uniformly heat-shrinked and granulated without local high temperature due to the offset of heat generated during external heating, resulting in melting of flakes and mutual welding. Moreover, according to this method, the controllability of temperature is also good.
[0082]
  In addition, this stirring blade is configured in multiple stages in accordance with the shape of the vertically long history heat shrink tank.Even withFor uniform heatingYes.
[0083]
According to the synthetic resin history granulating apparatus of the second aspect, it is an apparatus for realizing the granulating method of the first aspect, and exhibits the same effect as the apparatus.
[0084]
  According to the synthetic resin history granulation system of claim 3, in addition to the effect of claim 2, further, a pulverization device for generating predetermined pulverized flakes, and a quantitative discharge device for quantitatively discharging the pulverized flakes to the granulator As a whole, if you put a thin product to be recycled at the entrance, from the system,ProperThe particulate thermoplastic synthetic resin is discharged almost automatically.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an example of a synthetic resin hysteresis granulator according to the present invention.
FIG. 2 is a diagram showing a granulation test result table by the history granulation method of the synthetic resin of the present invention.
FIG. 3 is a graph showing the result of a granulation test by the history granulation method of the synthetic resin of the present invention.
4 shows a stirring blade used in the history granulator of FIG. 1, wherein (a) is a plan view thereof, and (b) is a side view of a principal part thereof broken away.
FIG. 5 is a block diagram showing an example of a synthetic resin hysteresis granulation system according to the present invention.
6 is a block diagram showing the pulverizing apparatus of FIG. 5 in more detail.
7 is a block diagram showing the quantitative discharge device of FIG. 5 in more detail.
FIG. 8 is a view showing a conventional granulating apparatus.
[Explanation of symbols]
6 Fine powder collection tank
8 Blockage prevention device
9 Intermediate collection tank
11 History heat shrink tank
13 Stirring blade
16 Cooling mixer
50 Synthetic resin history granulator
60 Crusher
70 Fixed discharge device
80 History granulation system of synthetic resin
F ground flakes
S Granules

Claims (3)

Longitudinal cylinders of pulverized flakes obtained by pulverizing stretched thermoplastic synthetic resin film having a thickness of 1 μ to 100 μm or thermoplastic synthetic resin fibers having a fiber diameter of 1 μm to 100 μm to an effective diameter or an effective length of 1.2 mm to 3 mm Is supplied to a continuous heat shrink tank, and the rotation speed of the stirring blades arranged concentrically and vertically in the hysteresis heat shrink tank is controlled to stir the supplied crushed flakes and raise the temperature to the drawing temperature. is warm, the history heat shrinkage by this history granulation method of the synthetic resin, characterized in that for granulating the pulverized flakes Ryakudama shape. Stretched thermoplastic synthetic resin film having a thickness of 1 μm to 100 μm or a thermoplastic synthetic resin fiber having a fiber diameter of 1 μm to 100 μm is pulverized into spherical particles having an effective diameter or an effective length of 1.2 mm to 3 mm. A history granulating device for granulating synthetic resin,
A fine powder collection tank that receives the supply of pulverized flakes, collects it and supplies it to the intermediate collection tank,
The intermediate collection tank that is provided with a clogging prevention device and that supplies the history heat shrink tank without clogging the pulverized flakes supplied from the fine powder collection tank;
The hysteresis heat shrink tank, which is a vertically long cylindrical shape and in which stirring blades arranged concentrically in multiple stages rotate ,
A thermometer for measuring the temperature of the pulverized flakes in the history heat shrink tank;
A cooling mixer for cooling and discharging the granulated pulverized flakes having a predetermined temperature discharged from the hysteresis heat shrink tank,
In the history heat shrink tank, by controlling the rotation speed of the stirring blades arranged concentrically in a vertical direction, the pulverized flakes supplied from the intermediate collection tank are stirred, and the pulverized flakes are heated by the thermometer. measurement while, allowed to warm to stretching temperature, which according to the history heat shrinkage, history granulator synthetic resin, characterized in that for granulating the pulverized flakes Ryakudama shape. The stretched thermoplastic synthetic resin film having a thickness of 1 μm to 100 μm or the thermoplastic synthetic resin fiber having a fiber diameter of 1 μm to 100 μm is pulverized to an effective diameter or an effective length of 1.2 mm to 3 mm to obtain pulverized flakes. A grinding device;
A quantitative discharge device for quantitatively discharging the pulverized flakes thus generated;
Quantitative discharged history granulation system of the synthetic resin, characterized in that it is made more structure and history granulating equipment according to claim 2, the grinding flakes history granulation from the quantitative discharge apparatus.

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