JPH081749A - Material feeder for plastic extruder - Google Patents

Abstract

(57) [Summary] [Purpose] To enable continuous production of products of short length and multiple colors. [Structure] At the lower ends of the base pellet hopper 11 and the master color batch hopper 12, respectively,
Air-conveying scales 13 and 14 are provided. In the master color batch transporting scale 14, compressed air is jetted from the air nozzle 16 into the material supply pipe 15 connecting between the hopper 11 and the material supply port 2, and the master color batch 4 in the hopper 12 is transported by air. It is charged into the material supply port 2. On the other hand, in the meter 13 for transporting the base pellets, compressed air is injected into the material supply pipe 15 from the air nozzle 16 and the compressed air injection port 18 to transport and supply the base pellets 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a material supply device for supplying a plastic extrusion material to a material supply port of a plastic extruder.

[0002]

2. Description of the Related Art FIGS. 3 and 4 are views showing a conventional material supply device for a plastic extruder. In particular,
The one in which plural kinds of materials are supplied to the material supply port 2 of the plastic extruder 1 at a predetermined mixing ratio is shown.

In the material supply device 30 shown in FIG. 3, a hopper 31 for accumulating the base pellets 3 and a plurality of master color batches 4, 4, ... Are provided on the material supply port 2 of the plastic extruder 1. The hoppers 32, 32, etc. for accumulating are provided radially around the material supply port 2. These base pellet hopper 31 and master color batch hopper 32,
At the lower end of 32 ..., A screw-type weighing device 33 for weighing the materials 3 and 4 in the hopper into the material supply port 2 is installed. When the materials 3 and 4 in the hoppers 31 and 32 are compounded and supplied to the extruder 1, the motor 34 of the weighing machine 33 is driven to rotate the screw 35, and the materials 3 and 4 gravity-supplied in the housing 36 are supplied. It is sent to the material supply port 2 side by rotation of the screw 35 at any time, and is thrown into the material supply port 2 from the drop port 37. Here, as for the mixing ratio of the materials 3 and 4 to be fed into the material supply port 2, the rotation speed of the screw 35 is set in advance for each measuring device 33, and the screws 35, 35 ... Are simultaneously driven at the set rotation speed. This keeps it constant.

Further, in the material supply device 40 shown in FIG. 4, one base pellet hopper 41 and one master color batch hopper 42 are provided on the material supply port 2 of the plastic extruder 1. Hopper 4
A turntable type weighing machine 43 is provided at the lower end portions of the 1, 42. When the materials 3 and 4 in the hopper are compounded and supplied to the extruder 1, the motors 44 and 44 of the weighing machine 43 are driven to rotate the turntables 45 and 46, and the hopper 4
The materials 3 and 4 are taken out from the gap between the lower end outlets of the 1, 42 and the upper surfaces of the turntables 45 and 46. The material 4 discharged from the hopper 42 onto the turntable 46 is a weir 47.
Is mixed with the material 3 discharged from the inside of the hopper 41 by being discharged onto the lower turntable 45. Then, the materials 3 and 4 mixed on the turntable 45 are
Further, the weir 48 on the turntable 45 dispels the material to the material supply port 2. The mixing ratios of the materials 3 and 4 dropped into the material supply port 2 are the turntables 45 and 4.
It is kept constant by simultaneously driving 6 at a preset rotation speed.

[0005]

The material supply device 30 shown in FIG. 3 has the following problems.

The structure of the weighing device 33 is complicated and large,
Due to the large space required for the weighing device 33, only one hopper 31, 32 can be installed for each material supply device 30. Therefore, even if many materials are mixed and supplied, they cannot be dealt with. For example, even if an attempt is made to manufacture a product of multiple colors with the extruder 1, it is impossible to supply materials in accordance therewith.

Since the expensive screw 35 and the motor 34 are used for the measuring device 33, the material supply device 30 itself becomes considerably expensive.

When changing the materials 3 and 4 to be used,
The current material must be dispensed from the weighing machine 33,
At this time, it is necessary to pull out the screw 35 from the housing 36 and clean it, and it takes time and labor to change the material.

Further, the material supply device 40 shown in FIG. 4 has the following problems.

As in the case of the device 30, the weighing device 4
The structure of 3 is complicated and large, the material supply device is expensive, and there are restrictions when manufacturing products of various colors.

Multiple types of master color batches 4, 4
.. cannot be selected and supplied, that is, in order to avoid color mixing, it is usual to provide one base pellet hopper 41 and one master color batch hopper 42. With such a configuration, when the product is a short product, it is not possible to continuously change colors.

An object of the present invention is to solve the above-mentioned drawbacks of the prior art, and to provide a material feeder for a plastic extruder which has a simple structure and is inexpensive, and can achieve space saving.

Another object of the present invention is to provide a material feeding device for a plastic extruder capable of continuously producing products of short length and multicolor type.

[0014]

In order to achieve the above object, the material supply device of the present invention is a hopper for accumulating material to be supplied to a plastic extruder, a discharge port at the lower end of the hopper, and the above-mentioned discharge port. The material supply pipe is connected to the material supply port of the extruder, and the air nozzle is provided in the middle of the material supply pipe to inject compressed air into the material supply pipe.

Here, it is preferable that the inner diameter of the material supply pipe is larger on the extruder side than on the hopper side with the air nozzle as a boundary.

When a plurality of types of materials are mixed and supplied,
It suffices to install a plurality of the material supply devices, and in this case,
It is preferable to install one base pellet feeder and a plurality of master color batch feeders.

[0017]

[Function] The discharge port of the hopper is connected to the material supply port of the plastic extruder by the material supply pipe, and the air nozzle is provided in the middle of the material supply pipe, so that the compressed air injected from the air nozzle causes the material to enter the material supply pipe. An air stream is generated that can carry the material in the hopper. If the material in the hopper is conveyed by air and supplied to the extruder in this way, the screw,
Avoid using large and expensive parts such as motors,
The material can be metered with an extremely simple and inexpensive structure.

If the inner diameter of the material supply pipe connecting the hopper and the extruder is increased on the extruder side with the air nozzle as a boundary, the air flow flowing from the hopper side to the extruder side in the material supply pipe. Is generated, and good air transfer of the material is possible.

Further, by providing a plurality of the above-mentioned material supply devices and mixing and supplying a plurality of kinds of materials, space saving is achieved,
It is possible to mix and supply various materials. That is, it is only necessary to provide a material supply pipe with an air nozzle interposed between the material supply port of the extruder and the discharge port of the hopper, and it is possible to reduce the size of the measuring unit and save space. It becomes possible to mix and supply more materials.

The combination of the compounding materials can be arbitrarily selected, but if a plurality of types of master color batches are prepared, and these are sequentially selected and then compounded and supplied with the base pellets, continuous color change of the product can be performed. We can make products of short length and multi-color type.

[0021]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a material supply device 1 according to this embodiment.
0 is a diagram showing a schematic configuration of No. 0, and FIG. 2 is an enlarged diagram showing a weighing unit of the material supply device 10. As shown in FIG. 1, on a material supply port 2 of a plastic extruder 1, a base pellet hopper 11 for accumulating base pellets 3 and a plurality of master color batches 4, 4 are provided.
The master color batch hoppers 12, 12 for accumulating ... Are radially installed around the material supply port 2. Then, at the lower ends of the base pellet hopper 11 and the master color batch hopper 12, there are provided scales 13 and 14 for measuring and supplying the hopper internal materials 3 and 4 to the material supply port 2, respectively. Thus, one base pellet supply device 5 and a plurality of (8 in this case) master color batch supply devices 6, 6 ... Are radially arranged around the material supply port 2.

In the material supplying apparatus 10 of this embodiment,
As the scales 13 and 14, those for feeding the materials 3 and 4 in the hoppers 11 and 12 into the material supply port 2 by air conveyance are used. This air-conveying meter 13,1
4 is the discharge ports 11a and 12a at the lower ends of the hoppers 11 and 12
And a material supply pipe 15 connecting the material supply port 2 of the plastic extruder 1, an air nozzle 16 provided in the middle of the material supply pipe 15, and compressed air to the air nozzle 16 via a compressed air supply pipe 17. It is composed of an air source (not shown) for supplying.

As shown in FIG. 2, the material supply pipe 15 is inserted into the input side pipe 21 and the input side pipe 21 into which the material 3 (or 4) in the hopper 11 (or 12) is charged by gravity. It comprises a discharge side pipe 22 for guiding the material 3 (or 4) onto the material supply port 2 and discharging it. The input-side pipe 21 and the discharge-side pipe 22 are made to have different thicknesses,
The air nozzle 16 is connected by being fitted into the housing 23 from both sides.

Housing 23 of the air nozzle 16
Is formed in a substantially cylindrical shape, and the front end portion of the injection side pipe 21 is fitted and attached to an opening at one end side (left side in the drawing) of the pipe. Further, the rear end portion of the discharge side pipe 22 is fitted into the opening on the other end side (right side) of the housing 23 with a predetermined length inserted, whereby the discharge side pipe 22 inside the housing 23 is fitted. An annular space 24 is defined on the outer peripheral side. Further, a gap 25 having a predetermined width d ₁ is provided between the inner wall of the housing 23 and the rear end edge of the discharge side pipe 22, and the gap 25 communicates the annular space 24 with the material supply pipe 15. It functions as a nozzle opening.

The compressed air sent from the compressed air supply pipe 17 is supplied to the annular space 24 through the inlet 26. Edge portions 27, 28 are formed in parallel with each other at the front end edge of the input side tube 21 and the rear end edge of the discharge side tube 22 so as to direct the nozzle opening 25 into the discharge side tube 22. ing.

Compressed air supply pipe 1 from an air source (not shown)
The compressed air supplied to the air nozzle 16 through 7 is
The material enters the annular space 24 through the inlet 26, flows in the annular space 24 in the circumferential direction, and then is injected into the material supply pipe 15 through the nozzle opening 25 having the width dimension d ₁ . Here, the inner diameter of the material supply pipe 15 is the hopper 11 (or 1
Since the extruder 1 side is larger than the 2) side (Db ≧ Da), the compressed air jetted into the material supply pipe 15 flows to the discharge side pipe 22 (extruder 1) side. Therefore, the air flow A directed toward the extruder 1 side is generated in the material supply pipe 15 at any time, and the material 3 (or 4) charged in the material supply pipe 15 is drawn into the air flow A by an appropriate amount. It is conveyed to the drop-in port 15a side.

In FIG. 2, 18 is a material supply pipe 1.
5 is a compressed air injection port formed at the rear end of the injection pipe 5 and is connected to an air source (not shown) via a compressed air supply pipe 19. The compressed air injection port 18 is provided to convey a larger amount of the base pellets 3 than the master color batch 4, and is provided only on the side of the base pellet supply device 5 as shown in FIG.

Next, the material supply device 1 of this embodiment described above.
The operation of 0 will be described.

When coloring the product manufactured by the extruder 1, the base pellets 3 and the predetermined master color batch 4 are put into the material supply port 2. Further, when the color of the product is changed, a plurality of types of master color batches 4, 4, ... Are sequentially selected and then added together with the base pellet 3. At this time, if the base pellets 3 and the master color batch 4 are not uniform, color unevenness occurs in the product. Therefore, the base pellets 3 and the master color batch 4 are simultaneously supplied to the material supply port 2. That is, compressed air as an air source is simultaneously supplied to the base pellet supply device 5 and the selected master color batch supply device 6, and the base pellets 3 in the hopper 11 and the master color batch 4 in the hopper 12 are respectively weighed with a scale 13, Air is conveyed by 14 and charged into the material supply port 2.

The carrying amount of the base pellets 3 and the master color batch 4 is determined by the air pressure supplied to the compressed air inlet 26 of the air nozzle 16 and the inner diameter of the material supply pipe 15.
(Inner diameter Da of input side pipe 21 and inner diameter D of discharge side pipe 22
b) is determined by the width dimension d ₁ of the nozzle port 25. Therefore, if these values are set arbitrarily, the base pellets 3 and the master color batch 4 can be conveyed in appropriate amounts by the air flow A in the material supply pipes 15 and 15, respectively, and can be metered into the material supply port 2. .

The blending ratio of the base pellet 3 and the master color batch 4 is usually "10 to 15: 1".
It is necessary to Therefore, compressed air is jetted from the air nozzle 16 into the material supply pipe 15 of the master color batch supply device 6 to convey the master color batch 4 by air.
The base pellets 3 are conveyed by air by injecting compressed air through the air nozzle 16 and the compressed air supply port 18 into the inside 5. As a result, the base pellets 3 can be transported in a much larger amount than the transport amount of the master color batch 4, and the base pellets 3 and the master color batch 4 can be supplied at a predetermined mixing ratio.

As described above, in the present embodiment, the materials 3 and 4 in the hoppers 11 and 12 are conveyed by air and introduced into the material supply port 2 of the plastic extruder 1, so that the weighing machine 13 is used. , 14 need not be provided with large and expensive parts such as conventional screws and motors, and the scales 13, 14 can be made compact and space-saving. Therefore, the material supply device 10 of the present embodiment
In this case, a large number of hoppers 11 and 12 can be mounted, and various materials 3 and 4 can be mixed and supplied. Particularly, in this embodiment, a large number of master color batch hoppers 1 are used.
2, 12 ... are mounted, and master color batches 4, 4 ... are selected and then compounded and supplied with the base pellets 3. Therefore, even if the product obtained from the extruder 1 is a short product, color can be easily and continuously obtained. Therefore, it is possible to manufacture products of short length and multicolor type. Since short length and multi-color products can be continuously manufactured, scraps at the start of extrusion and scraps at the time of color change can be greatly reduced.

Further, in the present embodiment, the compressed air injection port 18 is provided at the rear end of the material supply pipe 15 of the base pellet supply device 5, so that the master color batch 4 and the base pellet 3 are appropriately mixed. Can be supplied in ratio. That is, since the compounding ratio of the master color batch 4 and the base pellet 3 is usually “10 to 15: 1”, the base pellet feeding device 5 is more than the master color batch feeding device 6 per unit time (10 to 15 times). ) Material must be transported. In this respect, it is conceivable to change the specifications of the air nozzle 16 and the material supply pipe 15 between the side of the base pellet supply device 5 and the side of the master color batch supply device 6, but this alone has a limit, and the composition as described above is used at all. You can't get a ratio. In this embodiment, the material supply pipe 15 of the base pellet supply device 5 is provided with the compressed air injection port 18 in addition to the air nozzle 16 to generate a strong air flow in the material supply pipe 15.
It can be supplied in the above-mentioned mixing ratio.

Further, in this embodiment, the hopper 1
Since the materials 3 and 4 in 1 and 12 are pneumatically conveyed and supplied,
The structures of the weighing devices 13 and 14 are hoppers 11 and 12
The material supply port 1 is connected to the material supply port 2 by the material supply pipe 15, and the air nozzle 16 may be provided in the middle of the material supply pipe 15, and the material supply device 1 having an extremely simple and inexpensive structure.
You can get 0.

Further, such an air carrying type measuring device 1
Maintenance of 3 and 14 is extremely easy, and the running cost can be reduced. Particularly, in this embodiment, as shown in FIG. 2, the input side pipe 21 and the discharge side pipe 22 are
Since and are connected by being fitted into the housing 23 of the air nozzle 16 from both sides, for example, when changing the extruded material, the input side pipe 21 and the discharge side pipe 2
It suffices to pull out 2 from the housing 23 and clean it, and the material changing operation can be performed extremely easily.

In the above embodiment, an example in which the base pellets 3 and the master color batch 4 are compounded and supplied has been described, but other compounding materials may be compounded. As an example of mixing and supplying three or more kinds of compounding materials, a combination of a first base pellet, a second base pellet, a master color batch, a base pellet, an additive, a master color batch, and the like can be considered. Also,
In the above-mentioned embodiment, an example in which the master color batch 4 is blended with the base pellet 3 and supplied is described, but the combination of blending materials can be arbitrarily selected. Therefore, the master color batch 4 is not always necessary, and a plurality of types of base pellets may be compounded and supplied. In any case, if another compounding material is required, a new supply device may be added.

[0038]

In summary, according to the present invention, the following excellent effects are exhibited.

(1) According to the first and second aspects, since the material in the hopper is conveyed by air and supplied to the extruder, it is possible to obtain a material supply device having a simple structure and inexpensive. Also,
Maintenance becomes extremely easy and maintenance costs can be reduced.

(2) According to the third aspect, the master color batch and the base pellets are respectively supplied to the extruder by air conveyance, so that space can be saved and a hopper can be added. Become. Therefore, it is possible to select and supply a large number of types of master color batches to the base pellets, and to supply short-length, multicolor type products continuously.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of a material supply device according to the present invention.

FIG. 2 is an enlarged view showing a scale to which the material supply apparatus of the present invention is applied.

FIG. 3 is a schematic view showing an example of a conventional material supply device.

FIG. 4 is a schematic view showing another example of a conventional material supply device.

[Explanation of symbols]

 1 Plastic Extruder 2 Material Supply Port 3 Base Pellet 4 Master Color Batch 5 Base Pellet Supply Device 6 Master Color Batch Supply Device 10 Material Supply Device 11, 12 Hopper 13, 14 Meter 15 Material Supply Pipe 16 Air Nozzle 18 Compressed Air Injection entrance

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasufumi Kaga 5-1-1 Hidaka-cho, Hitachi-shi, Ibaraki Hitachi Cable Co., Ltd. Hidaka factory (72) Inventor Ichiro Maejima 5 Hidaka-cho, Hitachi-shi, Ibaraki 1-1-1 Hitachi Cable Co., Ltd. Hidaka Plant (72) Inventor Katsuo Suzuki 5-1-1 Hidakacho, Hitachi City, Ibaraki Hitachi Cable Co., Ltd. Hidaka Plant

Claims (3)

[Claims] 1. A hopper for accumulating a material to be supplied to a plastic extruder, a material supply pipe connecting between a discharge port at a lower end of the hopper and a material supply port of the extruder, and the material supply. A material supply device for a plastic extruder, characterized by comprising an air nozzle interposed in the middle of the tube to inject compressed air into the material supply tube. 2. The material supply device for a plastic extruder according to claim 1, wherein the inner diameter of the material supply pipe is set to be larger on the extruder side than on the hopper side with the air nozzle as a boundary. 3. A material supply for a plastic extruder equipped with a base pellet supply device for metering base pellets into a material supply port of the plastic extruder and a master color batch supply device for respectively metering a plurality of master color batches. In the apparatus, the master color batch supply device comprises a hopper for accumulating a master color batch, and an air nozzle provided in a material supply pipe connecting the discharge port at the lower end of the hopper and the material supply port, The base pellet supply device includes a hopper for accumulating base pellets, an air nozzle provided in a material supply pipe connecting a discharge port at the lower end of the hopper and the material supply port, and a rear end of the material supply pipe. Material supply device for a plastic extruder, characterized by comprising: .