JPH0661759B2 - Recycling device for thermoplastic resin scrap material and molding line for thermoplastic resin sheets, etc. equipped with the recycling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a strip-shaped scrap material produced when trimming both side edges of a sheet or the like with a trimmer device in a molding line for a thermoplastic resin sheet or film, The present invention relates to a scrap material recycling apparatus and a molding line equipped with the recycling apparatus so that the scrap material can be continuously collected and reused.

[Prior Art] For example, in a thermoplastic resin film molding line, a resin film material C kneaded by a batch type kneading machine 81 is continuously fed through a kneading roll machine 82 as shown in FIG. After sending it to the calendar roll 83,
The film is rolled into a film B by 83 and trimmed on both side edges of the film B by a trimmer device 84, and wound on a winder 85. Therefore, the trimmer device
When trimming film B with 84, film B
A strip of scrap material A (known as ears in the industry) was cut from.

By the way, as shown in FIG. 9, the scrap material A is conventionally supplied to a crusher 102 via a take-up roll 101, crushed into chips by the crusher 102, and then warmed by a pneumatic transport device 103 to a warmer roll 104. And was kneaded by the warmer roll 104 and heated to be melted in a semi-gel state. The scrap material A ′ thus melted in the semi-gel state is conveyed to the kneading roll machine 82 by an operator, and then, is put into the kneading roll machine 82 together with the resin film material C kneaded by the batch type kneader 81. It was reused.

In addition, the strip-shaped scrap material A cut by the trimmer device 84 is crushed between a spirally continuous rotary blade of a cutter screw and a linear fixed blade provided on the cylinder side to be cut into chips. An apparatus (Japanese Patent Publication No. Sho 56-19808) has been proposed, which compresses and heats it into a semi-gel, extrudes it into a string shape, cuts it into a certain size, then cools it and regenerates it into granules.

[Problems to be Solved by the Invention] In the former strip-shaped scrap material collecting apparatus using a crusher described above, fine powder-like scrap material is scattered during crushing, and the driving noise of the crusher is large. As a result, the working environment is deteriorated, and the fine powdery scrap material scattered at the time of crushing adheres to the sheet or film in the molding process to deteriorate the quality of the product. It takes time to heat the crushed scrap material with a warmer roll to melt it into a semi-gel state, and since the worker carries the melted scrap material into the kneading roll machine of the molding line in fixed amounts, it puts it in. However, it is difficult to synchronize with the line speed of the molding line, the efficiency is low, and a large amount of scrap material remains when the resin material is switched, which is wasteful and uneconomical.

In the latter regenerator using a cutter screw, the melted scrap material is cooled and granulated.Therefore, it is necessary to reheat it with a warmer roll to melt it, so that it can be reused in the molding line. Requires equipment and extra energy. Since the rotary blade of the cutter screw and the fixed blade of the cylinder described above act so as to crush the scrap material, if the scrap material is not crushed between both blades and slippage occurs, the scrap material will not move between the blades. Since it does not cut in smoothly, it becomes impossible to cut along with the supply speed of the strip-shaped scrap material supplied from the trim device. Therefore, with the above-described cutter screw cutting structure, it is difficult to reuse the scrap material while collecting the scrap material in synchronization with the line speed of the molding line.

The present invention has been made in view of the above-mentioned points, and the scrap material can be reused while being collected in synchronization with the line speed of the molding line, the work environment is not deteriorated, and the quality of the product on the molding line is adversely affected. It is an object of the present invention to provide a scrap material reclaiming device capable of minimizing material loss, working time loss, and power loss. At the same time, it is intended to provide a molding line equipped with the recycling device.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the scrap material recycling apparatus of the present invention has a strip-shaped scrap material such as a thermoplastic resin sheet or film supplied from a supply port of a cylinder formed into chips. A cutter screw for cutting is a device for recycling thermoplastic resin scrap material that is rotatably fitted in the cylinder, and a plurality of fixed blades are continuously arranged in a sawtooth shape on both sides of the supply port. , A large number of rotary blades tapering in the feed direction of scrap material corresponding to the saw blade shape of each fixed blade on both sides, so that the cutter screw meshes with each of the fixed blades continuous in a saw blade shape It is formed in a connected state along the spiral mountain.

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

Further, a cutter screw that cuts a strip-shaped scrap material such as a thermoplastic resin sheet or film supplied from the supply port of the cylinder into a chip shape, a compression screw that compresses and heats the scrap material cut into a chip shape, and a compression heat. And semi-gelled scrap material is quantified and extruded from the extrusion port of the cylinder and an extrusion screw, which is sequentially and integrally rotatably provided on a common drive shaft and is rotatably fitted into the cylinder, A plurality of fixed blades are continuously arranged in a saw-tooth shape on both sides of the supply port, and a large number of tapers are taper-shaped in the feed direction of the scrap material corresponding to the saw blade shapes of the fixed blades on both sides. The rotary blade is formed in a connected state along the spiral ridge of the cutter screw so as to mesh with each of the fixed blades that are continuous like a saw blade, and the compression screw is The apparent volume of the scrap material is configured to gradually decrease in the feed direction so that the wrap material is compressed and the shearing heat generation effect of the screw is promoted. It is desirable to configure so as to maintain a predetermined temperature and a sufficient residence time to achieve a kneaded state.

A molding line equipped with the reclaiming device of the present invention is a molding line in which both side edges of a thermoplastic resin sheet or film molded by a calendar roll or an extruder are trimmed by a trimmer device and then wound by a winder, The strip-shaped scrap material cut by a trimmer device is continuously supplied to the regenerator according to claim 3, and the scrap material melted in a semi-gel state by the regenerator is synchronized with the line speed of the molding line to produce the calender roll. Alternatively, it is returned to the extruder.

[Operation] According to the recycling apparatus of the present invention having the above-described configuration, the strip-shaped scrap material supplied into the supply port is drawn into the cylinder as the cutter screw rotates, and at the same time, the fixed blade on the cylinder side and the cutter. It is cut into chips by the shearing action of meshing with the rotary blade on the screw side.
Then, the cut scrap material is sent in a specific direction in the cylinder by the rotation of the cutter screw. If the inside of the cylinder is formed so that its opening cross section has a biaxial hole shape and the pair of cutter screws are rotatably fitted to each other, the ability to cut scrap material is significantly improved.

According to the regeneration device of claim 3 of the present invention, after the scrap material cut into chips by the same operation as that of the regeneration device of claim 1 is sent to the compression screw,
It is compressed by the compression screw and is heated by the compression action to be heated and melted into a semi-gel state. The semi-gelled scrap material is sent to the next extrusion screw, and the feed speed is adjusted by the extrusion screw.In other words, while the semi-gelled scrap material is filled in the extrusion screw without any gap, it is accompanied by the rotation of the extrusion screw. Is quantified and extruded from the extrusion port. Further, the extrusion speed of the semi-gelled scrap material extruded from the extrusion port can be adjusted by changing the rotation speed of the drive device that drives each screw at the same time.

According to the molding line of the present invention, the strip-shaped scrap material cut by the trimmer device is continuously supplied to the reclaiming apparatus according to claim 3, and the scrap material in the semi-gel state is reclaimed by the reclaiming apparatus. It becomes possible to return to the calender roll or the extruder in synchronization with the line speed.

[Embodiment] An embodiment of a recycling apparatus for scrap material and an embodiment of a molding line equipped with the recycling apparatus of the present invention will be described below with reference to the drawings.

1 is a front view showing a part of the reproducing apparatus in a sectional view, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG.
It is the III-III sectional view taken on the line of FIG.

In FIG. 1, on a bed 2 of a reproducing apparatus 1, a screw type reproducing apparatus main body 3 and a variable speed drive motor 6 (FIG. 7) are integrally connected. A supply port 32 is provided near the drive gear 62 at the upper end of the cylinder 36 of the apparatus body 3, and an extrusion port 33 is provided at one end of the cylinder 50. Supply port 32
A pair of supply rollers 34 are rotatably arranged above each other in contact with each other, and the drive motors 35 of both supply rollers 34 are installed on the drive gear portion 626.

The recycling device main body 3 has a strip-shaped scrap material A such as a thermoplastic resin sheet or film supplied from the supply port 32.
Cutter part 3A for cutting into a chip shape, compression part 3B for compressing and heating scrap material A cut into a chip shape, and scrap material A'compressed and semi-gelled to a fixed amount from said extrusion port 33. It consists of an extruding section 3C that turns into extrudate.

In the cutter section 3A, as shown in FIGS. 2 and 3, the cutter screw is placed in the cylinder 36 having the same inner diameter in the axial direction.
37 is rotatably fitted. Fixed blades 38 and 40 in which a plurality of fixed blades 38a and 40a are continuously and integrally formed in a sawtooth shape are attached to the upper end of the cylinder 36 on both sides of the supply port 32 with set screws 39 and 41, respectively. . On the other hand, a plurality of (four in this embodiment) spiral ridges 43 formed between the spiral grooves 42 of the cutter screw 37 have fixed blades 38a and 40a.
A plurality of rotary blades 44 tapered in diameter in the feed direction of the scrap material A corresponding to the saw blade shape are connected so as to mesh with the respective fixed blades 38a and 40a which are continuous in the saw blade shape. Is formed in.

In the compression section 3B, the inner diameter of the cylinder 46 is gradually reduced in the feeding direction of the scrap material A, the outer diameter of the compression screw 47 is also gradually reduced according to the inner diameter of the cylinder 46, and the apparent volume of the scrap material A is reduced accordingly. It is designed to gradually decrease in the feeding direction. Therefore, the scrap material A is compressed as it is sent to the left in the drawing in the cylinder 46, and in combination with the shearing action of the rotation of the compression screw 47, the scrap material A is heated and the semi-gel material is heated. Is melted into a state. As a means for compressing the scrap material A, in addition to the means for reducing the inner diameter of the cylinder 46, there are means for gradually reducing the depth of the spiral groove 48 and for gradually decreasing the pitch of the spiral groove 48. .

In the push-out section 3C, the inner diameter of the cylinder 50 is made the same as the minimum diameter of the cylinder 46 so as to be equal in the axial direction. Also, the outer diameter of the extrusion screw 51 is set to be equal in the axial direction together with the cylinder 50. The spiral groove 52 of the extrusion screw 51 is made slightly shallower than the spiral groove 48 of the cylinder 46, and the compression screw 47
The semi-gel-like scrap material A ′ sent from the above is filled in the cylinder 50 without any gap. Furthermore,
The lengths of the cylinder 50 and the extrusion screw 51 and the depth of the spiral groove 52 are set so that the semi-gel state of the scrap material A ′ sent into the cylinder 50 is uniformly and properly maintained. In addition, since the amount of heating required to maintain the semi-gel state of the scrap material A ′ may be insufficient only by the shearing action of the rotation of the extrusion screw 51, in this embodiment, the heating fluid around the cylinder 50 is used for heating fluid. A jacket 53 is provided to supplementarily heat. The heating means may be an electric heater. Especially when the jacket 53 is deployed,
With the temperature sensor 54 installed as in this embodiment, the cylinder
It is desirable to measure the temperature inside 50 so that the degree of heating by jacket 53 can be adjusted. Reference numeral 55 in FIG. 1 is a torpedo, which is attached to the tip of the extrusion screw 51. A rod die (not shown) may be attached to the extrusion port 33 so that the extrusion amount of the scrap material A'can be adjusted.

By the way, one end of each of the screws 37, 47 and 51 is a common drive shaft 61 driven by the drive motor 6 (FIG. 7).
(Fig. 2), each is detachably fixed. Therefore, the screws 37, 47, and 51 are integrally rotated by the drive shaft 61. If a plurality of linear grooves (not shown) are provided on the inner peripheral surface of the cylinder 46 of the compression section 3B in the axial direction, the feeding action of the scrap material A is improved and the cutter section 3A is also fed. The reverse flow of the scrap material A can be prevented. A similar linear groove may be provided on the inner peripheral surface of the cylinder 36 of the cutter portion 3A.

FIG. 4 shows a method of processing the cutter screw 37. A taper portion whose outer diameter is gradually reduced in the axial direction is formed on the outer peripheral surface of the cylindrical body so as to be sequentially connected like a bamboo shoot as shown by the solid line in the figure. Performs primary processing on a lathe. Next, as shown by the alternate long and short dash line in the drawing, the spiral groove 42 is secondarily processed at a constant groove depth and at a constant pitch, and along the spiral crests 43 formed between the spiral grooves 42, a third groove is formed.
As shown in the figure, a large number of rotary blades 44 that act as cutting blades in the rotational direction are formed in a connected state.

Next, the operation mode of the reproducing apparatus of the above-described embodiment will be described.

In FIGS. 1 to 3, a supply port is provided through a supply roller 34.
The scrap material A supplied from the 32 into the cylinder 36 is hooked by the rotary blade 44 of the cutter blade 37 as the cutter screw 37 rotates in the counterclockwise direction (Fig. 3), and is fixed at the inlet side.
It is drawn into the inside of the cylinder 36 from the meshing portion with 38a.
Since the tip of the fixed blade 38a bites inwardly of the tip of the rotary blade 44, the scrap material A is forcibly bent inward of the cutter screw 37 while the rotary blade 44
Between the fixed blade 38a and the fixed blade 38a, and both blades 44 and 38
It is cut into chips by the shearing action due to the engagement of a. The cut chip-shaped scrap material A is further finely chipped by the shearing action of the fixed blade 40a and the rotary blade 44 after the fixed blade 40 on the outlet side prevents co-rotation with the cutter screw 37. Will be cut into. The scrap material A thus cut into chips has a spiral groove.
It enters the inside of 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 is heated by the compression action to be heated and melted into a semi-gel state. The semi-gelled scrap material A'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 material A ′ is filled without a gap between the cylinder 50 and the extrusion screw 51, and the rotation of the extrusion screw 51 causes the inside of the cylinder 50 to reach the extrusion port 33. While being gradually fed, it is quantified and extruded from the extrusion port 33. Even if the fixed blade 38a is omitted and only the fixed blade 40a is used,
A similar extruded state can be obtained only by changing the chipping ability.

FIG. 5 shows another embodiment of the scrap material recycling apparatus. The drawing shows the cutter portion of the reproducing apparatus.
The reproducing apparatus of the above embodiment is uniaxial, whereas the reproducing apparatus of this embodiment is biaxial. An opening cross section of the cylinder 36 'which is orthogonal to the axial direction is formed in a biaxial hole shape in the axial direction. A pair of cutter screws 37 and 37 are fitted in the cylinder 36 'of the cutter portion 3A so that one rotary blade 44 (spiral mountain 43) and the other spiral groove 42 mesh with each other. The meshing parts rotate downward. Fixed blade bodies 40 corresponding to the outlet side of the above-described embodiment are arranged on both sides of the supply port 32 'of the cylinder 36'. In the case of this embodiment, the scrap material A is drawn into the cylinder 36 'by the rotation of the pair of cutter screws 37 and 37. The scrap material A is a pair of cutter screws.
It is cut into chips by the shearing action of the rotary blades 44 of 37 and 37 meshing with each other and the shearing action of the rotary blades 44 of each cutter screw 37 meshing with the fixed blade 40a. Other configurations and operations are the same as those in the above embodiment. It is also possible to rotate the cutter screws 37 and 37 in the same direction.

FIG. 6 is a schematic diagram showing a calender molding line incorporating the regenerating apparatus of the first embodiment. In the figure, 8 is a thermoplastic resin film calendar molding line, in which a resin film material C kneaded by a Banbury mixer 81, which is a type of batch kneader, is continuously fed through a drop roll 82, which is a type of kneading roll machine. After being fed to the calender roll 83, the calender roll 83 rolls it into a film B, and the trimmer device 84 trims both side edges of the film B to wind the film B onto a winder 85. Then, the strip-shaped scrap material A cut from the film B when the film B is trimmed by the trimmer device 84 is passed through the take-up roll 86 and the air shooter 88.
Then, it is configured to be conveyed between the supply rolls 34 of the reproducing apparatus 1. The regenerator 1 is provided beside the drop roll 82 so that the semi-gelled scrap material A ′ extruded from the extrusion port 33 (FIG. 1) of the regenerator 1 is introduced into the drop roll 82. It has become. FIG. 7 is the sixth
In the plan view of an enlarged part of the figure, the rotation speeds of the drive motor of the take-up roll 86 and the drive motor 35 of the supply roll 34 are constant in the scrap material A in synchronization with the line speed of the forming line 8. It is electrically controlled so that the tension is maintained and the tension is supplied to the reproducing apparatus 1. On the other hand, the rotation speed of the drive motor 6 for the screws 37, 47 and 51 of the regenerator 1 is mainly determined by the gelling characteristics of the scrap material A and the extrusion port.
It is set based on the extrusion amount of the semi-gelled scrap material A'extruded from 33. Therefore, scrap material A
Of the scrap material A may be cut or loosened in the supply port 32 due to a difference between the supply speed of the scrap material and the peripheral speed of the cutter screw 37. However, even in such a case, as described above, the scrap material A produced by the cutter screw 37 is used.
Since the cutting work of is carried out smoothly, the scrap material A can be regenerated in synchronization with the line speed of the forming line 8.

FIG. 8 is a schematic diagram showing an extrusion molding line incorporating the regenerating apparatus of the first embodiment. In the figure, 9 is an extrusion molding line for a thermoplastic resin sheet, in which a resin sheet material kneaded by a batch-type kneading machine (not shown) is fed into a material feeding hopper 92 of the extruder 91, and a sheet die of the extruder 91 is fed. The sheet D pushed out from the sheet 93 is fed forward through the chill roll 94, and then trimmed on both side edges of the sheet D by the trimmer device 95, and is wound around the winder 96. Then, the strip-shaped scrap material A cut by the trimmer device 95 is conveyed between the supply rolls 34 of the regenerator 1 by the air shooter 98 via the take-up roll 97. The regenerator 1 is provided above the scrap material charging hopper 99 of the extruder 91, and the semi-gelled scrap material A ′ extruded from the extrusion port 33 (FIG. 1) of the regenerator 1 is a hopper. It will be thrown into 99. However, the basic operation mode of the reproducing apparatus 1 is the same as that of the reproducing apparatus 1 in the molding line 8 in FIG.

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

(1) According to the apparatus of claim 1, the strip-shaped scrap material is cut into chips by the shearing action of the meshing of the rotary blade and the fixed blade, so that the scrap material can be cut smoothly even if the supply amount of the scrap material increases. Therefore, the scrap material can be recycled in synchronization with the line speed of the molding line. Further, the driving noise is lower than that of the conventional crusher, and the fine powdery scrap material does not adhere to the product to deteriorate the quality.

(2) According to the apparatus of claim 2, the ability to cut scrap material is significantly improved.

(3) According to the apparatus of claim 3, in addition to the effect of (1), the scrap material can be cut, melted into a semi-gel state, and quantitative extrusion of the semi-gelled scrap material can be performed continuously. , Can be incorporated into a film or sheet molding line. In addition, since it is synchronized with the line speed of the molding line, loss of resin material, loss of working time, and power loss can be minimized. Furthermore, since the resin material in the previous step that remains in the apparatus at the time of exchanging the resin material is small, it can be easily removed, and the next molding step can be performed in a short time.

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

[Brief description of drawings]

1 to 8 show an embodiment embodying the present invention,
1 is a front view showing a part of the reproducing apparatus according to the first embodiment in a sectional view, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. 3 is a sectional view of FIG. III-III line sectional view, FIG. 4 is a plan view explanatory view showing a method of processing a cutter screw, FIG. 5 is a sectional view corresponding to FIG. 2, showing a second embodiment of a scrap material recycling apparatus, FIG. 6 is a schematic diagram showing a calender molding line incorporating the regenerating apparatus of the first embodiment, and FIG.
FIG. 8 is an enlarged plan view of a part of FIG. 6, and FIG.
It is a schematic diagram which shows the extrusion molding line which incorporated the reproduction | regeneration apparatus of an Example. FIG. 9 is a schematic view showing a molding line equipped with a conventional crusher. 1 ... Reproducing device, 3 ... Device body, 36, 46, 50 ... Cylinder, 32 ... Supply port, 33 ... Extrusion port, 37 ... Cutter screw, 38, 40 ... Fixed blade body, 38a, 40a: fixed blade, 4
3 …… Helix mountain, 44 …… Rotating blade, 47 …… Compression screw, 5
1 …… Extrusion screw, 6 …… Drive motor, 8,9 ……
Forming line, A ... band-shaped scrap material, A '... semi-gel scrap material.

Claims (4)

[Claims] 1. A thermoplastic resin scrap material in which a cutter screw for cutting a strip-shaped scrap material such as a thermoplastic resin sheet or film supplied from a supply port of a cylinder into chips is rotatably fitted in the cylinder. In the reclaiming device, a plurality of fixed blades are continuously arranged in a saw-tooth shape on both sides of the supply port, and a taper shape is provided in a scrap material feeding direction corresponding to the saw blade shape of each fixed blade on both sides. A large number of rotary blades having a reduced diameter are formed in a concatenated state along the spiral ridge of the cutter screw so as to mesh with each of the fixed blades that are continuous in a sawtooth shape Playback device. 2. The thermoplastic according to claim 1, wherein the inside of the cylinder is formed so that an opening cross section orthogonal to the axial direction thereof has a biaxial hole shape, and a pair of the cutter screws are rotatably fitted therein. Equipment for recycling resin scrap materials. 3. A cutter screw for cutting a strip-shaped scrap material such as a thermoplastic resin sheet or film supplied from a supply port of a cylinder into a chip shape, and a compression screw for compressing and heating the scrap material cut into a chip shape. An extruding screw that quantifies and extrudes the semi-gelled scrap material that has been compressed and heated from the extrusion port of the cylinder is provided on the common drive shaft successively and integrally rotatably, and is rotatably fitted in the cylinder. Then, a plurality of fixed blades are continuously arranged in a sawtooth shape on both sides of the supply port, and the diameter of the fixed blades is tapered in the feeding direction of the scrap material in correspondence with the saw blade shapes of the fixed blades on both sides. A large number of rotary blades are formed in a concatenated state along the spiral ridge of the cutter screw so as to mesh with each of the fixed blades that are continuous like a saw blade, and the compression screw is a screw. The scrap material is configured so that the apparent volume of the scrap material gradually decreases in the feeding direction so that the shearing heat generation effect by the screw is promoted, and the extrusion screw is used by the extrusion screw. An apparatus for recycling a thermoplastic resin scrap material, characterized in that it is configured so as to maintain a sufficient residence time for a kneading state with a predetermined temperature. 4. A band-shaped scrap cut by the trimmer device in a molding line in which both side edges of a thermoplastic resin sheet or film molded by a calender roll or an extruder are trimmed by a trimmer device and then wound by a winder. Material is continuously supplied to the regenerator according to claim 3, and the scrap material melted in a semi-gel state in the regenerator is returned to the calender roll or the extruder in synchronization with the line speed of the molding line. Molding line for thermoplastic resin sheets, etc.