Recycled pellet manufacturing equipment

Abstract

To provide a recycled pellet manufacturing device which can selectively form only high-quality recycled pellet and does not cause problems such as tearing during conveyance of a loss film.SOLUTION: Cutter moving means 94 is operated so that, at a start of operation of a recycled pellet manufacturing device 10, a cutter 86 is in a retreated position not to cut a crimped twisted cord F3 with a concave indentation, and after a predetermined time has elapsed and quality of the crimped twisted cord F3 with the concave indentation has stabilized, the cutter 86 is moved to a side of the crimped twisted cord F3 with the concave indentation to be in a cutting position to cut it.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an improvement to a manufacturing device for recycled pellets that uses as raw materials, for example, the edges of double-layered film produced by inflation molding, which are the cut scraps at both ends of the film, and other product losses that occur during the manufacturing process (for example, double-layered film with poor thickness or that has been torn during the manufacturing process, or loss of raw material when changing products). [Background technology]

[0002] It has been common practice to process the large amount of waste film (long, wide edges and product waste) generated during the manufacturing process of resin films and other materials into recycled resin pellets (hereinafter simply referred to as "recycled pellets").

[0003] Recycled pellets are uniformly cylindrical, similar to rice-grain-shaped virgin pellets, and can be obtained by heating and melting waste film to extrude long, thin, circular-section resin strands, which are then cut. However, it has been pointed out that the quality of the resin deteriorates when recycled pellets are heated and melted, and therefore there has been a demand for a technology that can produce such recycled pellets without heating.

[0004] A known technique for producing recycled pellets without heating is disclosed in Patent Document 1. A conventional non-heating recycled pellet production device is roughly composed of a loss film supply section, a rotary compression section, and a cutting section.

[0005] The loss film supply section is a section where one or more loss films are stacked and sent to the rotary compression section while being stretched.

[0006] The rotary compression section includes a pair of compression rollers with irregularities formed on their outer peripheral surfaces and a take-up roller connected thereto, and rotates relative to the loss film supply section. This relative rotation imparts twist to the converged loss film taken from the loss film supply section and point-presses it to form a crimped twisted cord with concave indentations. The crimped twisted cord with concave indentations is pressed tightly to form deep concave indentations, and is fed out as a flat twisted cord. The take-up rollers rotate in the feed direction while sandwiching the flat crimped twisted cord with concave indentations, and feed it to the cutting section.

[0007] The cutting section has a circular saw-like cutter that rotates to cut the crimped twisted cord with concave indentations sent from the rotary compression section into short pieces at predetermined intervals, thereby forming flat, unheated recycled pellets with concave indentations on both sides.

[0008] When a loss film is set in a conventional recycled pellet manufacturing device and operation is started, the loss film begins to be drawn in first.

[0009] When the loss film is drawn in at a target speed (for example, the same speed as the production line if the loss film is supplied directly in-line from the production line), the rotary compression section and cutting section then start operating simultaneously. In the rotary compression section, the bundled loss film sent from the loss film supply section is twisted and compressed to form a crimped twisted string with concave indentations, which is then sent to the cutting section. In the cutting section, the crimped twisted string with concave indentations is cut into small pieces by a cutter to form recycled pellets. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] JP 2012-81605 A (Fig. 1) Summary of the Invention [Problem to be solved by the invention]

[0011] In the prior art, immediately after the rotary compression unit starts operating (in the early stages of operation), the rotary compression unit has not yet reached the target rotation speed, so the twist of the crimped twisted cord with concave indentations is insufficient (loose twist). If the twist of the crimped twisted cord with concave indentations is insufficient, the compressed density (density) of the recycled pellets formed by cutting it will be low, resulting in low quality that is not suitable for use as recycled pellets.

[0012] When the rotation speed of the rotary compression unit reaches the target rotation speed, the crimped twisted string with concave indentations is sufficiently twisted. The recycled pellets formed by cutting the crimped twisted string with concave indentations that has been sufficiently twisted have a high compression density and are of high quality suitable for use as recycled pellets.

[0013] In this way, in a recycled pellet manufacturing device, the quality of the recycled pellets produced differs immediately after operation begins (initial operation stage) and when the rotation speed of the rotary compression unit reaches the target rotation speed (stable stage). Therefore, it is necessary to separate the low-quality recycled pellets produced in the initial operation stage from the high-quality recycled pellets produced in the stable stage to prevent them from mixing, and this separation process is time-consuming.

[0014] Furthermore, in a conventional recycled pellet manufacturing apparatus, when the loss film is set and the operation of the recycled pellet manufacturing apparatus is started, the loss film begins to be drawn in first, as described above. However, with the recent increase in the width of the loss film, the following new problems have arisen.

[0015] In other words, the rotary compression section does not start rotating until the retraction speed of the loss film reaches the target speed, so the loss film is not twisted. In other words, the loss film is retracted into the rotary compression section at high speed while remaining in a highly expanded state.

[0016] At this time, if the end of the greatly expanded loss film comes into contact with the device on the loss film transport path, in the worst case scenario it may be torn off, making it necessary to reset the loss film, which is a problem.

[0017] The present invention has been made in view of the above-mentioned conventional problems, and aims to provide a recycled pellet manufacturing apparatus which can selectively produce only high-quality recycled pellets and which does not cause problems such as tearing of the lost film during transport. [Means for solving the problem]

[0018] The recycled pellet manufacturing device 10 of the present invention comprises a loss film supply section 12 that clamps and feeds out one or more loss films F1 together, and serves as the starting point K for twisting the loss films F1; a rotary compression section 14 that imparts a twist to the loss films F1 fed from the loss film supply section 12 and point-presses them to impart a concave indentation Y to form a crimped twisted string F3 with a concave indentation; and a cutting section 16 that cuts the crimped twisted string F3 with a concave indentation fed out from the rotary compression section 14 to a predetermined length.

[0019] The cutting section 16 has a cutter 86 and a cutter moving means 94 for moving the cutter 86 toward and away from the crimped twisted cord F3 with concave indentations fed out from the rotary compression section 14.

[0020] When the recycled pellet manufacturing device 10 starts operating, the cutter moving means 94 is in a retracted position where the cutter 86 does not cut the crimped twisted string F3 with concave indentations, and after a predetermined time has passed and the quality of the crimped twisted string F3 with concave indentations has stabilized, the cutter 86 is moved toward the crimped twisted string F3 with concave indentations and is positioned at a cutting position where it cuts it.

[0021] In the above-mentioned recycled pellet manufacturing apparatus 10, when the recycled pellet manufacturing apparatus 10 starts operating, the cutter 86 is in a retracted position where it does not cut the crimped twisted string F3 with concave indentations, so the crimped twisted string F3 with concave indentations, which is insufficiently twisted in the early stages of operation, is not cut, and low-quality recycled pellets P with low compression density are not formed.

[0022] After a predetermined time has passed and it has been confirmed that sufficient twist and indentations have been formed in the crimped twisted string with concave indentations F3 and that the quality has stabilized, the cutter moving means 94 is operated to move the cutter 86 toward the crimped twisted string with concave indentations F3. When the cutter 86 reaches the conveyance path of the crimped twisted string with concave indentations F3, the crimped twisted string with concave indentations F3 is cut by the cutter 86 to form recycled pellets P. The formed recycled pellets P are of high quality with sufficient twist and high compression density.

[0023] In this way, with the recycled pellet manufacturing device 10, by cutting only the crimped twisted string F3 with concave indentations that has been sufficiently twisted with the cutter 86, it is possible to selectively form only high-quality recycled pellets P with high compression density, thereby eliminating the need to separate low-quality recycled pellets P from good recycled pellets P as in the conventional method, thereby reducing the amount of work required.

[0024] It is also preferable to add the following configuration to the recycled pellet manufacturing device 10. For example, as shown in Fig. 3, the crimped twisted cord delivery port 28a with concave indentations of the rotary compression section 14 is provided with a guide member 78 that guides the crimped twisted cord F3 with concave indentations to the cutting position.

[0025] According to this invention, the crimped twisted cord F3 with concave indentations discharged from the rotary compression section 14 is reliably guided to the cutting position, so that poor cutting at the cutting section 16 can be prevented.

[0026] It is also preferable to add the following configuration to the recycled pellet manufacturing apparatus 10. The rotary compression unit 14 is operated so that the casing 30 of the rotating unit 20 and the compression rollers 38a and 38b of the compression unit 22 rotate simultaneously.

[0027] The recycled pellet manufacturing apparatus 10 operates as follows: When the waste film F1 set in the recycled pellet manufacturing apparatus 10 starts operation, it is twisted and drawn into the rotary compression section 14. Therefore, even when a wide waste film F1 is used as a raw material, it is drawn into the rotary compression section 14 as a tightly twisted string F2, and the waste film F1 is not torn due to friction during transport as in the past.

[0028] In addition, the rotary compression section 14 may be operated such that, when the recycled pellet manufacturing apparatus 10 starts operating, the casing 30 of the rotating section 20 rotates first, and after a predetermined time has elapsed, the compression rollers 38a and 38b of the compression section 22 rotate.

[0029] In the above case, the loss film F1 is twisted before being drawn into the rotary compression section 14. Therefore, as in the above case, even when a wide loss film F1 is used as a raw material, it is drawn into the rotary compression section 14 as a tightly twisted string F2, and the loss film F1 is not torn during transport as in the conventional case. [Effects of the Invention]

[0030] According to the present invention, it is possible to provide a recycled pellet manufacturing apparatus that can selectively produce only high-quality recycled pellets and that does not cause problems such as tearing of the lost film during transport. [Brief explanation of the drawings]

[0031] [Figure 1] 1 is a front view showing an example of a recycled pellet manufacturing apparatus according to the present invention. [Figure 2] 1 is a plan view of the embodiment. FIG. [Figure 3] FIG. 2 is a diagram showing the state in which the cutter of the cutting unit is in the retracted position in the embodiment of FIG. 1. [Figure 4] 1A and 1B are diagrams showing a state in which the cutter moving means is being operated to move the cutting unit from the retracted position to the cutting position in the embodiment shown in FIG. 1A; [Figure 5] 1A is a diagram showing a state in which the cutter of the cutting unit has reached the cutting position and is cutting the crimped twisted cord with concave indentations in the embodiment of FIG. 1. FIG. [Figure 6] FIG. 2 is a diagram showing a state in which the crimped twisted cord with concave indentations is being cut with a cutter in the embodiment of FIG. 1. [Figure 7] 10A and 10B are diagrams showing another embodiment of the cutting unit in the device of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0032] An embodiment of the present invention will be described below with reference to the drawings. As shown in Figures 1 and 2, a recycled pellet manufacturing apparatus 10 according to the present invention is roughly composed of a loss film supply section 12, a rotary compression section 14, and a cutting section 16.

[0033] The loss film supply unit 12 supplies one or more sheets of loss film F1 to the rotary compression unit 14, which will be described later, and has a pair of upper and lower pinch rollers 18a and 18b. In this embodiment, the loss film F1 is supplied inline from a film forming machine (not shown), but the loss film F1 may also be wound on a reel (not shown) as a supply source.

[0034] The pinch rollers 18a and 18b are the starting point K for twisting the loss film F1, and are arranged so that the upper pressure-side pinch roller 18a presses against the lower drive-side pinch roller 18b with a spring (not shown). As a result, the upper pressure-side pinch roller 18a rotates in the driven direction due to the rotation of the lower drive-side pinch roller 18b. The pressure applied by this pressure-side pinch roller 18a is adjusted by a compression force adjustment mechanism (not shown). Note that if there is no need to adjust the compression force, this mechanism need not be provided.

[0035] The rotary compression unit 14 is composed of a rotating unit 20, a compression unit 22 installed within this rotating unit 20, and a first driving unit 24 and a second driving unit 26 that rotate the rotating unit 20 and the compression unit 22 independently, and these are mounted on a stand 28.

[0036] The rotating section 20 is made up of a casing 30 and a first driven pulley 32, and the casing 30 is rotatably attached to a base 28 via front and rear bearings 34 and 36.

[0037] The casing 30 of the rotating part 20 is divided into a front section 30a and a rear section 30b, and the front section 30a is cylindrical, and the first driven pulley 32 and one of the bearings 34 are mounted thereon.

[0038] The rear section 30b is a hollow rectangular box-like structure that protrudes integrally with the front section 30a from its front end, and the other bearing 36 is attached to a protruding cylindrical support section 30c at the outlet section.

[0039] The compression unit 22 is made up of upper and lower compression rollers 38a and 38b, upper and lower feed rollers 40a and 40b, a hollow main gear member 44 to which a second driven pulley 42 is attached, and a gear train 46 (FIG. 2) made up of a plurality of gears that mesh with the main gear member 44 and rotate the drive-side compression roller 38b and the drive-side feed roller 40b. Either of the compression rollers 38a and 38b or the feed rollers 40a and 40b may be the drive roller.

[0040] The main gear member 44 is composed of a main gear 44a and a hollow shaft portion 44b, and the hollow shaft portion 44b is rotatably housed in the front section 30a of the casing 30, and the second driven pulley 42 is attached to the part that protrudes outside the front section 30a.

[0041] A main gear 44 a is provided at the end of the hollow shaft portion 44 b inside the casing 30 , and the main gear 44 a is disposed so as to face a notched window 48 in the casing 30 .

[0042] A driven gear 50 is provided on the outside of the casing 30 so that a portion of the driven gear 50 enters the casing 30 through the notched window 48, and meshes with the main gear 44a through the notched window 48.

[0043] A main worm gear 52 is attached to the rotation shaft of the driven gear 50, and a driven worm gear 54 is meshed with the main worm gear 52. The driven worm gear 54 is attached to one end of the rotation shaft 38c of the drive-side compression roller 38b.

[0044] 2, a first transmission gear 58 is attached to the other end of the rotary shaft 38c of the drive-side compression roller 38b, and a third transmission gear 62 is attached to the other end of the rotary shaft 40c of the drive-side feed-out roller 40b. Both the first transmission gear 58 and the third transmission gear 62 are meshed with an intermediate second transmission gear 60, and via the gear train 46 extending from the first transmission gear 58 to the third transmission gear 62, the drive-side feed-out roller 40b is set to rotate slightly faster, about 10% faster, than the drive-side compression roller 38b.

[0045] The first drive unit 24 is composed of a first drive motor 64 and a first drive pulley 66 attached to the rotary shaft of the first drive motor 64, and the first drive pulley 66 and the first driven pulley 32 are connected by a first timing belt 68.

[0046] The second drive unit 26 is composed of a second drive motor 70 and a second drive pulley 72 attached to the rotary shaft of the second drive motor 70, and the second drive pulley 72 and the second driven pulley 42 are connected by a second timing belt 74.

[0047] The compression rollers 38a and 38b of the compression section 22 are cylindrical members (or a cylindrical stack of many disks with many jagged protrusions on their outer peripheries), and their outer surfaces are covered with many hemispherical (wart-like) or elliptical or trapezoidal protrusions 76 in plan view or front view (see circle in Figure 2).

[0048] A rotary shaft 38c is provided at the center of each of the pressure-side compression roller 38a and the drive-side compression roller 38b, and both ends of the rotary shaft 38c are rotatably supported by the casing 30.

[0049] The upper pressure-side compression roller 38a is arranged to press against the lower drive-side compression roller 38b by a spring (not shown). As a result, the upper pressure-side compression roller 38a rotates in the driven direction due to the rotation of the lower drive-side compression roller 38b. The pressure applied by this pressure-side compression roller 38a is adjusted by a compression force adjustment mechanism (not shown). Note that if there is no need to adjust the compression force, this mechanism need not be provided.

[0050] The pair of upper and lower delivery rollers 40a and 40b of the compression unit 22 are disposed downstream of the compression rollers 38a and 38b, and, like the compression rollers 38a and 38b, their respective rotation shafts 40c are rotatably supported by the casing 30. The rotational force of the drive-side compression roller 38b is transmitted to the drive-side delivery roller 40b by a gear train 46 extending from the first transmission gear 58 to the third transmission gear 62.

[0051] Like the compression rollers 38a and 38b, the feed rollers 40a and 40b are also provided with a pressure adjustment mechanism (not shown) that adjusts the pressure of the upper feed roller 40a, which is the pressure-applying roller, against the lower drive roller 40b, which is the pressure-receiving roller, using a spring (not shown). If there is no need to adjust the pressure, this mechanism need not be provided.

[0052] The relationship between the drive-side compression roller 38b and the drive-side pinch roller 18b is set so that the drive-side compression roller 38b rotates faster than the drive-side pinch roller 18b, so that a stretching force (stretching force) is applied to the loss film F1 transported between the pinch rollers 18a and 18b and the compression rollers 38a and 38b.

[0053] In the rotary compression unit 14, the casing 30 of the rotating unit 20 and the main gear member 44 of the compressing unit 22 can be rotated independently. First, in the rotating unit 20, the casing 30 is rotated by driving the first drive motor 64 of the first drive unit 24. As a result, twist is applied to the loss film F1 between the pinch rollers 18a and 18b and the compression rollers 38a and 38b, and a twisted cord F2 is formed.

[0054] Meanwhile, in the compression unit 22, the main gear member 44 is rotated by driving the second drive motor 70 of the second drive unit 26. When the main gear member 44 rotates, its rotational force is transmitted to the driven gear 50, the main worm gear 52, and the driven worm gear 54, causing the drive-side compression roller 38b to rotate. The twisted string F2 is sandwiched from above and below by the pair of upper and lower compression rollers 38a and 38b, and is strongly compressed by the protrusions 76 on the surfaces of the compression rollers 38a and 38b. As a result, concave indentations Y are imparted to the surface of the twisted string F2, forming a crimped twisted string F3 with concave indentations. In this embodiment, the rotation unit 20 and compression unit 22 are operated simultaneously.

[0055] The crimped twisted cord F3 with concave indentations formed inside the casing 30 of the rotary compression section 14 is fed out from the protruding support section 30c which serves as the outlet section. A guide member 78 is attached to the section of the stand 28 where the support section 30c of the casing 30 is attached (this section is the delivery opening 28a which delivers the crimped twisted cord F3 with concave indentations to the cutting section 16).

[0056] The guide member 78 guides the crimped twisted cord F3 with concave indentations fed from the support portion 30c of the rotary compression section 14 to the fixed blade 98 of the cutting section 16 described later, and as shown in Figure 3, has a base portion 80 and a pair of left and right guide portions 82 and 84 protruding laterally (towards the cutting section 16) from the base portion 80.

[0057] The base portion 80 is a substantially rectangular plate-like portion, and the inner diameter of a round hole 80 a provided in the center thereof matches the inner diameter of the support portion 30 c of the casing 30 .

[0058] A pair of left and right guide sections 82 and 84 are provided on the base section 80, facing each other across a round hole 80a. Each guide section 82 and 84 restricts the left-right movement of the crimped twisted cord F3 with concave indentations, and the width between the guide sections 82 and 84 is set narrower than the width of a fixed blade 98 of the cutting section 16, which will be described later.

[0059] The tip of each guide portion 82, 84 is formed in a roughly L-shape, and the angle of the upper inclined surfaces 82a, 84a is set so as not to interfere with the cutter 86 of the cutting portion 16 described later when the cutter 86 is in the cutting position, and the angle of the lower inclined surfaces 82b, 84b is set so as not to interfere with the fixed blade 98 of the cutting portion 16 described later.

[0060] The cutting section 16 is the part that cuts the crimped twisted string F3 with concave indentations sent out from the rotary compression section 14, and is roughly composed of a cutter 86, a motor 88 with a transmission, a recycled pellet collection box 90, a housing 92, a cutter moving means 94, a winding roller 96 and a fixed blade 98.

[0061] The cutter 86 cuts the crimped twisted cord F3 with concave indentations fed from the rotary compression section 14 in cooperation with a fixed blade 98 described below, and a speed-variable motor 88 is connected to the rotary shaft 86a of the cutter 86. The rotation speed of the cutter 86 can be changed as desired by adjusting the rotation speed of the speed-variable motor 88, and is set appropriately taking into consideration the feed speed of the crimped twisted cord F3 with concave indentations and the size of the desired recycled pellets P.

[0062] The center O of the rotation axis 86a of the cutter 86 is set to be higher by a height H than the extension of the line of movement L of the crimped twisted cord with concave indentations F3 when cutting the crimped twisted cord with concave indentations F3 (FIG. 5).

[0063] The width of the cutting blade 86b of the cutter 86 is set to be wider than the inner width of the left and right guide portions 82 and 84 of the guide member 78 described above.

[0064] A recycled pellet recovery box 90 is provided at the lower end of the cutter 86, and recycled pellets P formed by cutting the crimped twisted string F3 with concave indentations with the cutter 86 fall under their own weight and are stored in the recycled pellet recovery box 90.

[0065] The housing 92 contains the cutter 86, the motor 88 with a transmission, and the recycled pellet collection box 90, and its front surface 92a (the surface facing the rotary compression section 14) and side surface 92b are formed with a notch 100 which serves as a passageway for the crimped twisted string F3 with concave indentations.

[0066] A fixed blade 98 is attached to the inside of the front surface 92a of the housing 92, where the notch 100 is provided. The fixed blade 98 cooperates with the cutting blade 86b of the cutter 86 to cut the crimped twisted cord F3 with concave indentations, and its shearing surface 98a is slightly inclined inward (FIG. 5). The width of the fixed blade 98 is set wider than the cutting blade 86b of the cutter 86 (and therefore, in relation to the guide member 78 described above, it is set wider than the inner width of the left and right guide portions 82 and 84). As shown in FIG. 6, the cutting blade 86b of the cutter 86 is inclined with respect to the fixed blade 98 so as to shear the crimped twisted cord F3 with concave indentations.

[0067] The cutter moving means 94 moves the cutter 86 toward or away from the crimped twisted string with concave indentations F3, and in this embodiment, a ball screw mechanism is used. Briefly describing the ball screw mechanism serving as the cutter moving means 94, one end of a screw shaft 94a is rotatably attached to a motor 94b, and the other end of the screw shaft 94a is supported by a bearing 94c. A nut bracket 94d is threadedly attached to the screw shaft 94a, and this nut bracket 94d is attached to a housing 92. A guide rail 94e is attached to the bottom surface of the housing 92 in a direction perpendicular to the movement direction of the crimped twisted string with concave indentations F3, allowing the housing 92 to move on a base 94f. When the recycled pellet manufacturing apparatus 10 is not operating, the cutter 86 is located at a retracted position away from the crimped twisted string with concave indentations F3 (see FIG. 2).

[0068] The winding roller 96 is used to wind up the crimped twisted cord F3 with concave indentations delivered from the rotary compression section 14, and a torque motor 96a is connected to its rotary shaft. The winding roller 96 starts operating at the same time as the compression section 22 described above.

[0069] Next, we will explain the method for producing recycled pellets P using this recycled pellet manufacturing apparatus 10. First, one or more wide loss films F1, which serve as raw material, are set as specified between the pinch rollers 18a and 18b of the loss film supply unit 12. When there are multiple wide loss films F1, they are pulled together and stacked one on top of the other, and their leading ends are lightly twisted to form a bundle.

[0070] Next, this loss film F1 is passed through the hollow shaft portion 44b of the main gear member 44 in the rotary compression section 14, and its inserted end is inserted between the pair of compression rollers 38a and 38b and between the delivery rollers 40a and 40b in that order. The inserted end that has been pulled out from the support portion 30c of the casing 30 is wound around the take-up roller 96, thereby completing the setting of the loss film F1.

[0071] When the loss film F1 is just set up (before the recycled pellet manufacturing apparatus 10 starts operating), the loss film F1 is not twisted or compressed and is in a greatly expanded state. When there are multiple loss films F1, they are lightly twisted and bundled together as described above, and in this case too, the loss films F1 are in a greatly expanded state.

[0072] Once the setting of the loss film F1 is completed as described above, the power is turned on to the recycled pellet manufacturing apparatus 10. When the power of the recycled pellet manufacturing apparatus 10 is turned on, the rotating section 20 and the compressing section 22 of the rotary compressing section 14 start operating simultaneously.

[0073] First, the operation of the rotating unit 20 will be explained. When the rotating unit 20 starts to drive, the casing 30 starts to rotate around the loss film F1 as the center of rotation. This starts the "twisted cord forming process" in which the loss film F1 is twisted to form a twisted cord F2.

[0074] (Twisted string forming process) In the twisted cord forming process, the first drive motor 64 of the first drive unit 24 is driven. When the first drive motor 64 rotates, its rotational force is transmitted to the front section 30a of the casing 30 via the first timing belt 68 and the first driven pulley 32, and the casing 30 begins to rotate around the loss film F1. When the casing 30 rotates, the compression rollers 38a and 38b mounted inside the casing 30 also rotate together with the casing 30.

[0075] The loss film F1 is sandwiched from above and below between the pinch rollers 18a and 18b and the compression rollers 38a and 38b, and in this state the compression rollers 38a and 38b rotate along with the rotation of the casing 30. As a result, the loss film F1 between the pinch rollers 18a and 18b and the compression rollers 38a and 38b is twisted with the point of sandwiching between the pinch rollers 18a and 18b as the twisting starting point K, to become a twisted string F2.

[0076] In this embodiment, the casing 30 is set to rotate 5 to 10 times per second during the twisted cord formation process, which applies sufficient twist to the wide loss film F1 between the pinch rollers 18a and 18b and the compression rollers 38a and 38b to form a tight, thin twisted cord F2.

[0077] Meanwhile, in the compression section 22, the compression rollers 38a and 38b rotate, drawing the twisted string F2 into the rotary compression section 14 and point-crimping it to form a crimped twisted string F3 with concave indentations (point-crimping process), and then feeding this crimped twisted string F3 with concave indentations toward the cutting section 16 (feeding process).

[0078] (Point crimping process) In the point crimping process, operation of the second drive unit 26 is started. When the second drive motor 70 of the second drive unit 26 starts to rotate, the rotational force is transmitted to the main gear member 44 via the second timing belt 74 and the second driven pulley 42, and the main gear member 44 starts to rotate. Then, the main gear 44a of the main gear member 44 rotates the side driven gear 50, which rotates the drive-side compression roller 38b in the feed direction of the twisted cord F2 via the main worm gear 52 and the driven worm gear 54.

[0079] The pressure-side compression roller 38a is pressed against the drive-side compression roller 38b with a predetermined pressure, so that the pressure-side compression roller 38a rotates together with the drive-side compression roller 38b in the feed direction of the twisted string F2, drawing the twisted string F2 into the rotary compression section 14 at high speed.

[0080] The twisted cord F2 is sandwiched between the pair of upper and lower compression rollers 38a and 38b with a predetermined pressure, and as the twisted cord F2 is pulled into the rotary compression section 14, the protrusions 76 formed on the outer circumferential surface of the twisted cord F2 continuously form deep concave indentations Y on both the upper and lower surfaces, causing point-bonding, resulting in a crimped twisted cord F3 with concave indentations. In the crimped twisted cord F3 with concave indentations, the films are firmly bonded together by the concave indentations Y.

[0081] The twisted string F2 is twisted when the compression rollers 38a and 38b draw the twisted string F2 into the rotary compression section 14. Therefore, when the twisted string F2 is drawn into the rotary compression section 14 at high speed, even if the twisted string F2 comes into contact at high speed with the narrow passage of the rotary compression section 14, specifically the hollow shaft portion 44b of the main gear member 44, the twisted string F2 will not be torn off.

[0082] The compression rollers 38a and 38b have protrusions 76 formed on their outer surfaces that penetrate deeply into the crimped twisted cord F3 with concave indentations, causing the crimped twisted cord F3 to get caught in the compression rollers 38a and 38b and making it difficult to feed out. Therefore, the feed rollers 40a and 40b feed out the crimped twisted cord F3 with concave indentations toward the cutting section 16 (feed-out process).

[0083] In this embodiment, the "twisted string forming step" and the "point-pressing step" are performed simultaneously when the recycled pellet manufacturing apparatus 10 starts operating, but the "point-pressing step" may be performed after the "twisted string forming step." In this case, too, a tight, strong, thin twisted string F2 can be formed while being drawn into the rotary compression section 14, so that the strong twisted string F2 will not be torn during this drawing.

[0084] (Sending process) A first transmission gear 58 is attached to the other end of the drive-side compression roller 38b, and a third transmission gear 62 attached to the drive-side feed-out roller 40b rotates via a second transmission gear 60. The pressure-side feed-out roller 40a presses the crimped twisted cord with concave indentations F3 against the drive-side feed-out roller 40b with a constant pressure while clamping the crimped twisted cord with concave indentations F3, so the pressure-side feed-out roller 40a also rotates in the feed direction and feeds the crimped twisted cord with concave indentations F3 towards the cutting section 16.

[0085] The feed rollers 40a and 40b rotate in the feed direction slightly faster than the compression rollers 38a and 38b, and therefore apply tension to and pull up the crimped twisted cord F3 with concave indentations that is sandwiched between the compression rollers 38a and 38b and difficult to pull out because the protrusions 76 are deeply embedded in the concave indentations Y. As a result, the crimped twisted cord F3 with concave indentations is smoothly pulled out from between the compression rollers 38a and 38b and sent out from the support portion 30c of the casing 30 towards the cutting portion 16, where the crimped twisted cord F3 with concave indentations is cut (cutting process).

[0086] (cutting process) The crimped twisted cord F3 with concave indentations delivered from the delivery port 28a of the rotary compression section 14 is taken up by the take-up roller 96 of the cutting section 16. The take-up roller 96 starts to drive at the same time as the compression rollers 38a and 38b and the delivery rollers 40a and 40b described above.

[0087] The torque motor 96a of the winding roller 96 is controlled to constantly apply a constant torque to the crimped twisted cord F3 with concave indentations delivered from the rotary compression section 14 while winding it up. Therefore, the crimped twisted cord F3 with concave indentations delivered from the rotary compression section 14 is continuously wound up onto the winding roller 96 in a taut state (under tension) without slack between the delivery rollers 40a and 40b of the rotary compression section 14 and the winding roller 96.

[0088] After a predetermined time has elapsed and it has been confirmed that the crimped twisted string F3 with concave indentations being fed out of the rotary compression section 14 has been sufficiently twisted and that indentations Y have been formed (this is confirmed visually), the cutter moving means 94 is driven to move the cutter 86, which was in a retracted position, to the cutting position.

[0089] The operation of the cutter moving means 94 will now be described. In this embodiment, when the power to the cutter moving means 94 is turned on, the motor 94b rotates (in this case, forward rotation), and the screw shaft 94a rotates in accordance with the motor 94b. When the screw shaft 94a rotates, the nut bracket 94d threadedly attached to it moves on the screw shaft 94a toward the crimped twisted string with concave indentations F3, and the housing 92 to which the nut bracket 94d is attached also moves on the guide rail 94e toward the crimped twisted string with concave indentations F3 in accordance with the movement of the nut bracket 94d.

[0090] As the housing 92 moves toward the crimped twisted cord F3 with concave indentations, the side surface 92b of the housing 92 (the shaded area A in FIG. 3 ) eventually comes into contact with the crimped twisted cord F3 with concave indentations. If the housing 92 is moved further from this state, the crimped twisted cord F3 with concave indentations enters the notch 100 and eventually reaches the fixed blade 98 (this means that the cutter 86 has moved to the "cutting position" where it cuts the crimped twisted cord F3 with concave indentations). The crimped twisted cord F3 with concave indentations that has reached the fixed blade 98 is continuously cut by the rotation of the cutter 86, and recycled pellets P are successively formed. The recycled pellets P cut by the cutter 86 fall under their own weight and are successively stored in the recycled pellet collection box 90.

[0091] The concavely indented crimped twisted string F3 having the concave indentations Y formed thereon is cut at intervals including at least one or more concave indentations Y, preferably at intervals wider than the intervals between the concave indentations Y formed on its surface, to form recycled pellets P.

[0092] The lateral movement of the crimped twisted cord F3 with concave indentations is restricted by a pair of left and right guide portions 82 and 84 of the guide member 78, and the crimped twisted cord F3 with concave indentations can be reliably guided onto the fixed blade 98, which is the cutting position of the crimped twisted cord F3 with concave indentations, so that the crimped twisted cord F3 with concave indentations can be reliably cut.

[0093] In addition, the crimped twisted cord F3' (see Figure 5) with concave indentations, which includes insufficiently twisted portions in the early stages of operation and which passes over the fixed blade 98 before the cutter 86 reaches the cutting position, is wound onto the winding roller 96 and is not cut by the cutter 86 (is not pelletized).

[0094] As described above, according to the recycled pellet manufacturing apparatus 10 of this embodiment, only the crimped twisted string F3 with concave indentations Y, which has sufficient twist and has formed concave indentations Y, can be cut with the cutter 86 to selectively form only good recycled pellets P, eliminating the need to separate good recycled pellets P from low-quality recycled pellets P as in the conventional method, thereby reducing the labor required.

[0095] The direction of movement of the cutter 86 relative to the crimped twisted string F3 with concave indentations is not limited to the horizontal direction as in the above-described embodiment. For example, as shown in Figure 7, the cutter 86 may be moved vertically relative to the crimped twisted string F3 with concave indentations, as long as it can be freely switched between a state in which the crimped twisted string F3 with concave indentations is cut (cutting position) and a state in which it is not cut (retracted position). [Explanation of symbols]

[0096] 10: recycled pellet manufacturing device, 12: loss film supply section, 14: rotary compression section, 16: cutting section, 18: pinch rollers (18a: pressure side pinch roller, 18b: drive side pinch roller), 20: rotating section, 22: compression section, 24: first drive section, 26: second drive section, 28: frame, 28a: delivery port, 30: casing, 30a: front section, 30b: rear section, 30c: support section, 32: first driven pulley, 34-36: bearing, 38: compression rollers (38a: pressure side compression roller, 38b: drive side compression roller) roller), 38c: rotary shaft, 40: feed roller (40a: pressure side feed roller, 40b: drive side feed roller), 40c: rotary shaft, 42: second driven pulley, 44: main gear member (44a: main gear, 44b: hollow shaft portion), 46: gear train, 48: notched window, 50: driven gear, 52: main worm gear, 54: driven worm gear, 58: first transmission gear, 60: second transmission gear, 62: third transmission gear, 64: first drive motor, 66: first drive pulley, 68: first timing belt, 70: second drive motor , 72: second drive pulley, 74: second timing belt, 76: protrusion, 78: guide member, 80: base portion, 80a: round hole, 82-84: guide portion, 82a-84a: upper inclined surface, 82b-84b: lower inclined surface, 86: cutter, 86a: rotating shaft, 86b: cutting blade, 88: motor with transmission, 90: recycled pellet collection box, 92: housing, 92a: front surface, 92b: side surface, 94: cutter moving means, 94a: screw shaft, 94b: motor, 94c: bearing, 94d: nut bracket, 94 e: guide rail, 94f: base, 96: winding roller, 96a: torque motor, 98: fixed blade, 98a: shearing surface, 100: notch, A: part of the side of the housing that comes into contact with the crimped twisted string with concave indentation, F1: loss film, F2: twisted string, F3: crimped twisted string with concave indentation, H: height from the moving line of the crimped twisted string with concave indentation to the center of the cutter's rotation axis, K: starting point of twist, L: moving line of the crimped twisted string with concave indentation, O: center of the cutter's rotation axis, P: recycled pellet, Y: concave indentation

Claims

1. A recycled pellet manufacturing device (10) comprising: a loss film supply section (12) that clamps and feeds one or more loss films (F1) together, and serves as a starting point (K) for twisting the loss films (F1); a rotary compression section (14) that imparts twist to the loss films (F1) fed from the loss film supply section (12) and point-presses them to impart concave indentations (Y) to form a crimped twisted string (F3) with concave indentations; and a cutting section (16) that cuts the crimped twisted string (F3) with concave indentations fed from the rotary compression section (14) to a predetermined length, The cutting section (16) has a cutter (86) and a cutter moving means (94) for moving the cutter (86) toward and away from the crimped twisted string (F3) with concave indentations fed out from the rotary compression section (14), The cutter moving means (94) When the recycled pellet manufacturing device (10) starts operation, the cutter (86) is in a retracted position where it does not cut the crimped twisted string (F3) with concave indentations, After a predetermined time has passed and the quality of the crimped twisted string (F3) with concave indentations has stabilized, the cutter (86) is moved to the side of the crimped twisted string (F3) with concave indentations and is operated to be positioned at a cutting position to cut it.

2. The recycled pellet manufacturing device (10) described in claim 1, characterized in that a guide member (78) is provided at the discharge outlet (28a) of the crimped twisted string (F3) with concave indentations in the rotary compression section (14) to guide the crimped twisted string (F3) with concave indentations to the cutting position in the cutting section (16).

3. The rotary compression section (14) according to claim 1 or 2 comprises: a rotating part (20) having a casing (30) through which a loss film (F1) passes and which rotates around the loss film (F1) passing through the inside; a compression section (22) provided in the rotating section (20) and having a pair of upper and lower compression rollers (38a) and (38b) that hold the loss film (F1) and rotate around the loss film (F1) as a rotation center; At the start of operation of the recycled pellet manufacturing apparatus (10), The casing (30) of the rotating section (20) and the compression rollers (38a) and (38b) of the compression section (22) are operated to rotate simultaneously; or The recycled pellet manufacturing device (10) is characterized in that the casing (30) of the rotating unit (20) first rotates, and after a predetermined time has passed, the compression rollers (38a) and (38b) of the compression unit (22) are operated to rotate.

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