JPH0289608A - Recycling device of thermoplastic resin scrap material and molding line, in which the same device is equipped, of thermoplastic resin sheet of the like - Google Patents

Abstract

PURPOSE:To make it possible to efficiently recycle scrap material without exerting a bad influence upon quality by a method wherein fixed blades, which are provided in the form of saw tooth at both sides of a feed opening, and rotary blades, which are radially reduced in the direction of the feeding of the scrap material in a tapered form, are engaged with each other along the screw thread of a cutter screw and a compression screw and an extruder screw are rotated integrally. CONSTITUTION:Scrap material A is pulled in the interior of a cylinder 36 by the engagement of rotary blades 44 with fixed blades 38a with the counterclockwise rotation of a cutter screw 37 so as to be cut in fine chips. The scrap material A, which is fed in a cylinder 46, is heated by means of the compression action of a compression screw 47, melted in semi-gel state and gradually carried in a cylinder 50 with the rotation of an extruder screw 51 so as to be metered in order to be extruded from an extrusion opening 33. Thus, no lowering in quality due to the adhesion of fine particle-like scrap material to a product results and losses of resin material, operating time and electric power are laminated to minimum and further favorable working environment due to low noise results.

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial Application Field 1 This invention is directed to the use of strip-shaped scrap material produced when trimming both side edges of notebooks, etc. using a trimmer device I in a molding line for thermoplastic resin sheets, films, etc. This paper relates to a recycling device for scrap materials and a molding line equipped with the recycling device to enable continuous recovery and reuse of scrap materials.

[Prior Art] For example, in a thermoplastic resin film forming line, generally, as shown in FIG. After being fed into the calendar roll 83, it is rolled by the calendar roll 83 to form a film B, and then transferred to the trimmer device 84.
The film B is configured to be wound onto a winder 85 while trimming both side edges of the film B. Therefore, when trimming the film B with the trimmer device 84, the strip-shaped scrap material A (
The ears (called ears in the industry) were occurring.

Conventionally, as shown in FIG. 9, this scrap material A is supplied to a crusher 102 via a take-up roll 01, and after being crushed into chips by the crusher 102, it is transferred to a warmer roll by a pneumatic transport device 103. 104, and was kneaded and heated in the Tsutomorol 104 to be melted into a semi-gel state. Scrap material A melted into a semi-gel state in this way
After being carried to the kneading roll machine 82 by the sound of the operation, it was put into the kneading roll machine 82 together with the resin film material C kneaded in the batch type kneader 81, and was reused.

Further, the strip-shaped scrap material A cut by the trimmer device 84 is crushed and cut into chips between the spirally continuous rotary blade of the cover screw and the straight fixed blade provided on the 7th ring side. After that, it is compressed and heated to semi-gel and extruded into a string shape, which is then cut into certain dimensions and cooled.
An apparatus for recycling into granules (Japanese Patent Publication No. 19808/1983) has been proposed.

[Problems to be Solved by the Invention] The above-mentioned conventional belt-shaped scrap material recovery device using a crusher has the following drawbacks: ■ Fine powder scrap material is scattered during crushing, and the drive noise of the crusher is The large amount of dust deteriorates the working environment, and the fine powder scrap material scattered during crushing adheres to notebooks and films during the molding process, reducing the quality of the product. ■It takes a long time to heat the crushed scrap material in a molten roll and melt it to a half-Kel state, and the molten scrap material cannot be used in production.
Since the kneading rolls of the molding line are transported and fed into the kneading rolls at a constant rate, the line speed of the molding line is the same as 1υ1. Since scrap materials remain, a lot of material is wasted and it is uneconomical.

The latter recycling device using a cutter screw uses
To reuse it in a molding line, it is necessary to heat and melt it again using a lime roll, which requires heating equipment and extra energy. ■The rotating blade of the cutter screw mentioned above and the fixed blade of the cylinder act to crush the scrap material, so if ten pieces of scrap are crushed between the two blades and slipping occurs, the scrap +4 Since the cutter screw does not cut into the human body smoothly, it cannot cut according to the feeding speed of the strip scrap material supplied from the above-mentioned L/Lino equipment.Therefore, with the above-mentioned cutting structure of the cutter screw, The cone is synchronized with the line speed to collect and reuse scrap material.

This invention was made in consideration of the points of J-2, and it is possible to reuse scrap materials while collecting them in synchronization with the line speed of the molding line, without disturbing the work environment, and to improve the quality of products on the molding line 1-. There is no negative impact on the quality, and the material [l
Our aim is to provide a scrap material recycling device that can minimize waste, work time loss, and power loss. At the same time, we are trying to provide a molding line equipped with the regeneration device.

[Means for Solving the Problems] In order to achieve the above object, the scrap material recycling device of the present invention chips the strip-shaped scrap materials such as thermoplastic resin notebooks and films supplied from the supply port of the cylinder. In an apparatus for recycling thermoplastic resin scrap material in which a cutter screw to be cut is rotatably fitted in a cylinder, a plurality of fixings are disposed in succession in a saw blade shape on both sides of the supply port, respectively. At the same time, a large number of rotary blades whose diameters are tapered in the scrap material feeding direction in accordance with the saw blade shape of each fixed blade on both sides are attached to the helical thread of the cutter screw so as to mesh with each fixed blade. It is shaped like an articulated deaf.

Further, the inside of the cylinder may be formed so that the cross section of the opening perpendicular to the axial direction thereof has a biaxial hole shape, and the pair of cutter screws may be rotatably fitted into the cylinder.

Furthermore, there is a cutter screw that cuts strip-shaped scrap materials such as thermoplastic resin notebooks and films supplied from the supply port of the cylinder into chips, and a 11-d screw that compresses and heats the scrap materials cut into chips. and an extrusion screw that extrudes the scrap material that has been compressed and heated into a semi-gelatinous state from the extrusion port of the cylinder at a constant rate of 61 degrees, are sequentially and integrally rotatably provided on a common drive shaft.
111 rotatably fitted in the nori noda, and said supply [''
A plurality of fixed blades are arranged in a continuous saw-blade shape on both sides of the , and a large number of scraps (with a tapered diameter in the feeding direction of the The rotary blade is formed in a connected manner along the helical ridge of the cutter screw so that it meshes with each fixed blade (1irr), and the compression screw is compressed and sheared by the screw. Scrap (
The extrusion screw is configured such that the apparent volume of the scrap material gradually decreases in the feeding direction thereof, and the extrusion screw maintains a residence time sufficient for the scrap material to reach a predetermined temperature and mixed state j3. It is desirable to configure the

A molding line equipped with the recycling device of the present invention is a finishing line in which both sides of a Sl plastic resin sheet, film, etc. molded by a calendar roll or an extrusion molding machine are trimmed by a trimmer device and then wound by a winder. The strip-shaped scrap material 4 cut by the trimmer device is continuously supplied to the recycling device according to claim 3, and the scrap material melted into a semi-gel state in the recycling device is 1rI in synchronization with the line speed of the forming line. The product is then returned to the calender roll or extruder.

"Operation" -1- According to the reproducing device of the present invention having the configuration described above,
The strip-shaped scrap material supplied into the supply port is drawn into the cylinder as the cutter screw rotates,
At the same time, the fixed blade on the cylinder side and the rotary blade on the cutter screw side engage with each other, causing the shearing action to cut it into chips.

The cut scrap material is then sent in a specific direction within the cylinder by the rotation of the cover screw. Furthermore, if the inside of the surface marking ring is shaped so that its opening cross section is biaxially large, and the pair of cutter screws are fitted in a rotatable manner, the cutting capacity of scrap materials can be greatly improved. do.

According to the regeneration apparatus according to claim 3 of the present invention, after the scrap material cut into chips by the same action as the regeneration apparatus according to claim 1 is sent to the compression screw,
It is compressed by a compression screw, and the compression action generates heat and melts it into a semi-gel state. The semi-gelled scrap material is sent to the next extrusion screw, and the feed rate is adjusted by the extrusion screw.In other words, the semi-gelled scrap material is filled into the extrusion screw without any gaps as the extrusion screw rotates. It is quantified and extruded from the extrusion port. Furthermore, by changing the rotational speed of the drive device that simultaneously drives each screw, the extrusion speed of the semi-gelled scrap material extruded from the extrusion port can be adjusted.

According to the molding line of the present invention, the strip-shaped scrap material cut by the trimmer device is continuously supplied to the recycling device according to claim 3, and the scrap material made into a semi-gel state by the recycling device is sent to the molding line. It becomes possible to return to the calender roll or extrusion molding machine in synchronization with the line speed of .

[Example] Hereinafter, Example 11 of the scrap material recycling apparatus of the present invention will be described.
An example of a molding line equipped with f2 and its regeneration device is as follows:
The explanation will be based on the drawings.

Fig. 1 is a front view showing the entire reproduction device, taken along -4B in cross section, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 is a sectional view taken along the line III-III in Fig. 1. It is.

In FIG. 1, a screw type reproducing device main body 3 and a variable speed drive motor 6 (FIG. 7) are integrally installed on a bed 2 of a reproducing device 1. Cylinder 361 of device main body 3
A supply port 32 is opened near the drive gear section 62 at one end,
Further, an extrusion port 33 is provided at the side end of the cylinder 50. Above the supply port 32, a pair of supply rollers 34 are rotatably arranged in contact with each other, and a drive motor 35 for both supply rollers 34 is installed in the drive gear portion 626L.

The recycling device main body 3 is supplied with strip-shaped scrap material A such as a thermoplastic resin notebook or film, which is supplied from the supply port 32.
A cutter part 3A that cuts the scrap RA into chips, a compression section 3B that compresses and heats the scrap RA cut into chips, and a scrap +4A' that has been compressed and heated to become a half-kel.
Extrusion 113c without being quantified and extruded from the one-box foot extrusion port 33
Consisting of

For cutter part 3Δ, as shown in FIGS. 2 and 3,
A cutter screw 37 is rotatably fitted into a spring 36 having the same inner diameter in the axial direction. A plurality of fixed blades 38 are provided on both sides of the 1rlI supply port 32 at the upper end of the cylinder 36.
Fixed blade bodies 38 and 40, which are continuous and integrally formed into a saw blade shape, are connected to setscrews 39 and 41, respectively.
It is attached with. On the other hand, the cutter screw 37
A plurality of (four in this embodiment) spiral ridges 43 formed between the spiral grooves 42 are tapered in the feeding direction of the scrap HA in correspondence with the saw blade shapes of the fixed blades 38a and 40a. A large number of rotary blades 44 with diameters, or the above-mentioned male fixed blades 38
A and 40a are connected to each other so as to mesh with each other.

In part 4B, the inner diameter of the cylinder 46 is gradually reduced in the feeding direction of the scrap material A, and the outer diameter of the compression screw 47 is gradually reduced in accordance with the inner diameter of the cylinder 46. The volume is made to gradually decrease in the feeding direction. Therefore, the scrap HA is compressed as it is fed to the left in the figure, and the compression screw 47
Coupled with the shearing action caused by the rotation of the scrap material A, the scrap material A is heated and melted into a semi-gel state. In addition, as a means for compressing the scrap material, Ii?, which reduces the inner diameter of the cylinder 46, is used. In addition to the means described in f, there are means for gradually decreasing the depth of the spiral 't:'f 48 or gradually narrowing the pinch of the spiral i1448.

In the extrusion portion 3C, the inner diameter of the cylinder 50 is set to be the same as the +iir diameter of the orthogonal ring 46 in the axial direction. Further, the outer diameter of the extrusion screw 51 and the outer diameter of the extrusion screw 51 are made equal in the axial direction. The helical groove 52 of the extrusion screw 51 is made slightly shallower than the helical groove 48 of the cylinder 46, so that the half-gelled scrap fed from the compression screw 47 is filled into the cylinder 50 without any gaps. ing. Furthermore, the length of the cylinder 50 and the extrusion screw 51 and the depth of the spiral groove 52 are different from those of the cylinder 5.
The settings are made so that the semi-gel state of the scrap material A° fed into the container is maintained uniformly and appropriately. In addition, the heating M necessary to maintain the semi-gel state of the scrap material A' at f(B) may be insufficient only by the fJ breaking action caused by the rotation of the extrusion screw 51. A heating fluid jacket 53 is provided for supplementary heating.The heating means may be an electric heater.

When the heat exchanger 53 is installed in the cylinder, it is desirable to install a temperature sensor 54 as in this embodiment to measure the temperature inside the cylinder 50 so that the degree of heating by the heat exchanger 53 can be adjusted. Reference numeral 55 in Figure 1
is a torpedo, which is attached to the tip of the extrusion screw 51. Further, a rod die (not shown) may be attached to the extrusion port 33 so that the amount of extrusion during scrap injection can be adjusted.

Incidentally, each of the screws 37, 47 and 51 is removably fixed at one end to a common drive shaft 61 (FIG. 2) driven by the drive motor 6 (FIG. 7). Therefore, each of the screws 37, 47 and 51 is configured to rotate integrally with the drive shaft 61. Also,
By providing a plurality of straight grooves (U- shown in the figure) in the axial direction on the inner periphery of the cylinder 46 of the compression section 3B, the feeding action of the scrap HA will be improved, and at the same time, the feeding effect of the scrap HA to the cutter portion 3A will be improved. Backflow of scrap material A can also be prevented. Note that a similar straight groove may be provided on the inner periphery of the cylinder 36 of the cutter portion 3A.

FIG. 4 shows a method of machining the cutter screw 37, in which taper parts whose outer diameters are gradually reduced in the axial direction are connected to the outer peripheral surface of the cylindrical body in a bamboo-like shape as shown by the solid line in the figure. Perform primary processing on a lathe. Next, the spiral grooves 42 are secondary-processed at a constant pitch as shown by the dashed line in the figure, and the spiral ridges 4 formed between the spiral grooves 42 are
3, a large number of rotary blades 44 which act as cutting blades in the direction of rotation are formed in a connected state as shown in FIG.

Next, the operating mode of the playback device according to the embodiment shown in L will be explained.

1 to 3, the scrap +4A supplied into the cylinder 36 from the supply [ ] 32 via the supply roller 34 is fed into the cylinder 36 in the counterclockwise direction (the third
As the rotating blade 44 rotates toward the figure), the cylinder 36 is caught by the rotary blade 44 and is moved from the engaging part with the fixed blade 38a on the person's side.
be drawn inside.

Since the tip of the fixed blade 38a is biting inward from the tip of the rotary blade 44, the +iii scrap material A is forcibly bent inward of the cutter screw 37 while the rotary blade 44 and the fixed blade 38a are bent. It bites into the interlocking part of the
It is cut into chips by the shearing action caused by the engagement of both blades 44 and 38a.

After the cut chip-shaped scrap material A is prevented from rotating with the cutter screw 37 by the fixed blade 40 on the exit side, it is further broken into finer chips by the shearing action caused by the engagement between the fixed blade 40a and the rotary blade 44. The scrap material A, which has been cut into chips, is
It enters the spiral groove 42 and is sent to the cylinder 46 of the compression section 3B as the cutter screw 37 rotates. The chip-shaped scrap material A sent into the cylinder 46 is compressed by the compression screw 47, and due to the compression action generates heat and is heated and melted into a semi-gel state. The semi-gelled scrap HA' is sent to the cylinder 50 of the next extrusion section 3C.The feed rate is adjusted by the extrusion screw 51, and the semi-gelled scrap HA' is sent between the cylinder 50 and the extrusion screw 51. is filled without any gaps, and is gradually fed into the cylinder 50 to the extrusion port 33 as the extrusion screw 51 rotates, and is quantified and extruded [
” 33. Incidentally, even if one of the fixed blades 38a described above is omitted and only the fixed blade 40a is used, the same extrusion state can be obtained only by changing the chipping ability.

FIG. 5 shows another embodiment of the scrap material recycling apparatus. The drawing shows a part of the cutter of the reproducing device.

While the reproducing apparatus of the above embodiment is only a part, the reproducing apparatus of this embodiment is different in that it has two shafts. The open [ ] cross section perpendicular to the axial direction within the cylinder 36° is formed in the shape of a biaxial hole across the axial direction. Inside the 7 ring 36'' to the cutter part 3 is a pair of cutter screws 37.
and 37 are fitted so that one rotary blade 44 (spiral ridge 43) and the other spiral groove 42 mesh with each other, and the double-force twine screws 37 rotate in the direction F at the meshing portion. Further, on both sides of the supply [132°] of the cylinder 36, fixed blade bodies 40 corresponding to the output [] sides of the embodiment are respectively disposed. In this example, the scrap material A is drawn into the cylinder 36' by the rotation of the pair of cutter screws 37 and 37. Moreover, the scrap material A is a pair of cutter screws 37 and 37
It is cut into chips by the shearing action caused by the engagement of the rotary blades 44 and the shearing action caused by the engagement between the rotating blades 44 and fixed blades 40a of each canter screen J-37. Other configurations and operations are the same as those of the previous embodiment.

This is possible by rotating the 3, 37 and 37 in the same direction.

FIG. 6 is a schematic diagram showing a calender molding line incorporating the regeneration device of the first embodiment.

In the figure, reference numeral 8 indicates a calender molding line of a thermoplastic resin filler 1, in which a resin film material C kneaded by a Banbury mixer 81, which is a type of batch-type kneader, is kneaded. After being continuously fed into a calendar C1-roll 83 via a roll 82, it is rolled by a calendar roll 83 to form a film B, and while trimming both side edges of the film I3 by a trimmer device 84, it is wound by a winder 85. It is configured to take. Then, the strip-shaped scrap material A cut from the film B when the film B is trimmed by the limmering device 84 is transferred between the supply rolls 34 of the reproducing device 1 by the air no-yuter 88 via the take-up roll 86. configured to be transported. The playback device I is the dorothy roll 8
The semi-gel-like scrap (oA°) extruded from the extrusion port 33 (Fig.
is to be thrown into Dronbro Roll 82. FIG. 7 is a partially enlarged plan view of FIG. The scrap material A is electrically controlled so as to be supplied to the recycling device I while maintaining a constant tension in synchronization with the scrap material The rotational speed of the scrap HA is set mainly based on the gelling properties of the scrap HA and the semi-gelled scrap extruded from the extrusion [33]. There may be a difference between the speed and the circumferential rotational speed 1i of the cutter screw 37, causing the scrap it A to break or loosen within the supply port 32.However, in such a case, as described above, the cutter screw 37 Scrap material A
Since the cutting operation is carried out smoothly, the scraps I and tA can be recycled at the same line speed as the forming line 8.

FIG. 8 is a schematic diagram showing an I- and double-press molding line incorporating the reproducing apparatus of the first embodiment. In the figure, 9 is an extrusion molding line for plastic resin notebook.
Note 1 is put into the +4 material input hopper 92 of No. 1 and extruded from the sheet guide 93 of the extruder 91, and sent forward through the chill roll 94.
While trimming both side edges of the throat D with the winder 9
It is configured to be wound up to 6 times. Then, the strip-shaped scrap IA cut by the trimmer device 95 is passed through the take-up roll 97 to the air no-yuter 98,
The regenerating device 1 is provided on one side of the hopper 99 for inputting scrap material of the extruder 91. , scrap material A'' in the shape of a semi-circle extruded from the recycling equipment (extrusion 1) 33 (Fig. 1) is to be fed into the hopper 99. However, the recycling equipment The basic operating mode of 1 is the forming line 8 in Figure 6.
This is common to the playback device fil.

[Effects of the Invention] As is clear from the above description, the apparatus for recycling thermoplastic resin scrap material of the present invention and the molding line equipped with the apparatus for recycling produce the following effects.

(1) According to the apparatus according to claim 1, since the strip-shaped scrap material is cut into chips by the shearing action caused by the engagement of the rotary blade and the fixed blade, the scrap material can be smoothly cut even when the supply I'i1 of the scrap material increases. Therefore, the scrap) 4 can be recycled in synchronization with the line speed of the finishing line. In addition, the driving noise is lower than that of conventional crushers, and there is no possibility that fine powdered scrap material will be added to the product and degrade the quality of the product.

(2) According to the apparatus according to claim 2, the ability to cut scrap materials is greatly improved.

(3) According to the apparatus according to claim 3, in addition to the above-mentioned effects (+), cutting of scrap material, melting to a semi-gel state, and constant (i) extrusion of semi-gelled scrap material are continuously performed. Since it can be done, it can be incorporated into a molding line for films, notebooks, etc.

In addition, it can be synchronized with the line speed of the molding line, so
Resin material loss, work time loss, and power loss are minimized. Furthermore, since only a small amount of the resin material from the previous process remains in the equipment when replacing the resin material, it can be easily removed.
You can move on to the next molding process in a short time.

(4) According to the molding line of claim 4, compared to a line equipped with a conventional crusher, the burden of working noise and power loss are significantly reduced, and the noise is also low and the working environment is good. be.

[Brief explanation of drawings]

1 to 8 show embodiments embodying this invention,
FIG. 1 is a partially sectional front view showing the entire reproducing apparatus according to the first embodiment, FIG. 2 is a sectional view taken along the line Ill of FIG. -ITI line sectional view, 4th
The figure is an explanatory plan view showing a method of processing a cutter screw, Figure 5 is a sectional view corresponding to Figure 2, showing a second embodiment of the scrap recycling device, and Figure 6 is a cross-sectional view corresponding to the first embodiment. A schematic diagram showing a calender molding line incorporating a regeneration device, FIG. 7 is an enlarged plan view of a part of FIG. 6, and FIG. 8 is an extrusion molding line incorporating the regeneration device of the first embodiment. It is a schematic diagram showing a line. Fig. 9 is a schematic diagram showing a molding line equipped with a conventional pulverizer. Port, 33 Extrusion port, 37 Cutter screw, 38.40... Fixed blade body, 38a,
40a... Fixed blade, 43 Spiral thread, 44 Rotating blade, 47 Compression screw, 51... Extrusion screw 6
... Drive motor, 8.9 Molding line, A:'+
``R-shaped scrap material, A') 4-kel-shaped Scrannobuo.

Claims (1)

[Scope of Claims] 1. A thermoplastic resin in which a cutter screw for cutting strip-shaped scrap materials such as thermoplastic resin sheets and films into chips, which is supplied from a supply port of the cylinder, is rotatably fitted into the cylinder. In the scrap material recycling device, a plurality of fixed blades are arranged in a continuous saw blade shape on both sides of the supply port, and the feeding direction of the scrap material is adjusted in accordance with the saw blade shape of each fixed blade on both sides. 1. A recycling device for thermoplastic resin scrap material, characterized in that a large number of rotary blades each having a tapered diameter are formed in a connected manner along a helical ridge of a cutter screw so as to mesh with each of the fixed blades. 2. The thermoplastic resin scrap material according to claim 1, wherein the inside of the cylinder is formed so that an opening cross section perpendicular to the axial direction thereof has a biaxial hole shape, and the pair of cutter screws are rotatably fitted into each cylinder. playback device. 3. A cutter screw that cuts strip-shaped scrap materials such as thermoplastic resin sheets and films supplied from the supply port of the cylinder into chips, a compression screw that compresses and heats the scrap materials cut into chips, and a compression-heated an extrusion screw for quantifying and extruding semi-gelatinized scrap material from the extrusion port of the cylinder, and an extrusion screw is provided on a common drive shaft so as to be sequentially and integrally rotatable, and is rotatably fitted in the cylinder; On both sides of the supply port, a plurality of fixed blades are arranged in a continuous manner in the shape of a saw blade, and a large number of fixed blades with a tapered diameter in the feeding direction of the scrap material are installed, corresponding to the saw blade shape of each fixed blade on both sides. A rotary blade is formed in a connected state along the helical crest of the cutter screw so as to mesh with each of the fixed blades, and the compression screw is configured such that the scrap material is compressed and the shear heating effect by the screw is promoted. The configuration is such that the apparent volume of the scrap material gradually decreases in the feeding direction, and the extrusion screw is configured to maintain a residence time sufficient for the screw to bring the scrap material into a predetermined temperature and crosstalk state. A recycling device for thermoplastic resin scrap material, characterized in that it is configured as follows. 4. In a forming line where both sides of thermoplastic resin sheets, films, etc. formed by a calendar roll or an extrusion molding machine are trimmed by a trimmer device and then wound by a winder, the strip-shaped scrap material cut by the trimmer device is Heat that is continuously supplied to the regeneration device according to claim 3, and the scrap material melted into a semi-gel state in the regeneration device is returned to the calender roll or extrusion molding machine in synchronization with the line speed of the molding line. Molding line for plastic resin sheets, etc.