TWI383877B - Method and apparatus for forming strands - Google Patents

Description

Strand forming method and device

The present invention relates to a strand forming method for extruding strands from a composite extruded from a mixer, and a strand forming apparatus comprising a mixer.

JP-A-2003-112317 discloses a granule manufacturing technique in which a strand is extruded through a nozzle portion from a plurality of holes in a mold attached to a cylindrical head of a mixer, and While the strands are extruded into pellets, the strands are cut to a predetermined length by rotating the cutter. In accordance with the disclosed technique, a housing is integrally attached to one side of the extruded strands on the mold. The housing is formed in such a way that its internal space is filled with an inert gas.

In the above related art, the formed granules are passed through a casing filled with an inert gas, thus meaning that the granules are prevented from being exposed to oxygen in the air until they leave the casing. This formation method and apparatus are employed. Although such a forming method and apparatus are designed to prevent a decrease in physical properties, the forming method and apparatus still have the following disadvantages: since it is necessary to provide a housing filled with an inert gas, or the housing must be integrated with the mold. Therefore, the size of the device becomes large, or a large space must be provided for installation. Moreover, such a forming method and apparatus also has the disadvantage that it is difficult to replace the mold or perform maintenance work on the apparatus.

As a countermeasure against the above problem, if the casing is not provided, or the casing is otherwise filled without providing an inert gas, the composite or resin precipitate generated on the periphery of the holes in the mold is oxidized and faded. . The inventors of the present invention have considered that if these oxidized resin precipitates adhere to the extruded strands, there is a fear that physical properties may be lowered, or foreign substances may be present in the generated pellets.

In addition to the above, the inventors of the present invention have found that any improved method for increasing the fluidity by modifying the material of the mold or changing the pore configuration in the mold in order to prevent the occurrence of resin precipitates cannot constitute long-lasting usefulness. The countermeasure is because the mold used is aged or the configuration of the hole in the mold is changed.

In view of the above circumstances, the present invention has been made in view of the above, and it is an object of the present invention to provide a method and apparatus for forming a strand which can sufficiently ensure the generated pellet even if the configuration of the forming device has been simplified. The quality of the substance.

In order to achieve the above object, according to a first aspect of the present invention, a strand forming method is provided, comprising the steps of: extruding from a hole disposed in one or more molds to form a strand, and simultaneously spraying inactive toward the hole; gas.

According to a first aspect of the invention, the holes in the one or more molds are filled with an inert gas. Even if a resin precipitate is generated, by spraying an inert gas, it is possible to prevent the portion where the resin precipitate is generated from being exposed to oxygen in the air.

According to a second aspect of the present invention, there is provided a strand forming method according to the first aspect of the present invention, wherein the inert gas is heated and sprayed while the flow of the inert gas is adjusted.

According to the second aspect of the present invention, even if a resin precipitate is generated, the solidification of the resin precipitate generated around the pores in the one or more molds can be prevented by the inert gas heated and adjusting the gas flow thereof. .

According to a third aspect of the present invention, there is provided a strand forming apparatus comprising: a mold having a plurality of holes; and a gas spraying unit disposed near the hole to spray an inert gas toward the holes.

According to the third aspect of the present invention, even if a resin precipitate is generated, the generated resin precipitate is prevented from being exposed to oxygen in the air by the inert gas sprayed by the spray unit. The inert gas is filled in some places in a precise manner by the gas spraying unit. Therefore, such a forming apparatus is fabricated to have a configuration in which it does not require a device having a large size and does not require a large space in the vicinity of the mold.

According to a fourth aspect of the present invention, a strand forming apparatus according to a third aspect of the present invention, comprising: a heater for heating an inert gas; and an air flow for adjusting a flow of the inert gas A regulator, wherein the heater and the damper are disposed upstream of the gas spraying unit.

According to the fourth aspect of the present invention, the inert gas is separately heated and the gas flow is adjusted by the heater and the damper, and since the inert gas having a high temperature and a uniform gas flow is ejected from the gas spraying unit in this state, It is possible to prevent solidification of resin precipitates generated around the holes in the one or more molds.

According to a fifth aspect of the present invention, a strand forming apparatus according to a third aspect of the present invention, comprising: a moving arm that moves the gas spraying unit toward or away from the holes; and an angle adjusting mechanism, The installation angle of the gas spray unit mounted on the moving arm is changed.

According to the fifth aspect of the present invention, by moving the moving arm while forming the strand, the gas spraying unit can be brought close to the one or more molds for use. Conversely to this, for example, when performing maintenance work, the moving arm is moved in the opposite direction to move the gas spraying unit away from the holes in the one or more molds. In the vicinity of the holes in the one or more molds, the gas spraying unit is adjusted to an optimum spray angle for use. Moreover, it is effective to adopt a configuration in which a gas spraying unit or a moving arm is moved using a mounting frame or the like.

According to a sixth aspect of the invention, there is provided a strand forming apparatus according to a third aspect of the invention, wherein the gas spraying unit comprises a pair of gas spraying units which face each other.

According to a sixth aspect of the invention, the inert gas is sprayed uniformly from the pair of gas spraying units toward the holes in the one or more molds. Therefore, oxidation of the resin precipitate generated around the holes in the one or more molds can be prevented.

According to a seventh aspect of the present invention, there is provided a strand forming apparatus according to the third aspect of the present invention, wherein the gas spraying unit has a plurality of spraying holes, and each of the spraying holes is sprayed inactive toward each of the holes of the mold. gas.

According to the seventh aspect of the invention, each of the spray holes uniformly sprays the inert gas toward the respective holes of the mold. Therefore, oxidation of the resin precipitate generated around the holes in the one or more molds can be prevented.

According to an eighth aspect of the invention, there is provided a strand forming apparatus according to the fourth aspect of the invention, wherein the heater comprises a body, a heat transfer medium, and a spiral passage into which the inert gas flows.

According to the eighth aspect of the invention, the inert gas flowing into the heater is sufficiently heated to a high temperature. Therefore, oxidation of the resin precipitate generated around the holes in the one or more molds can be prevented.

According to the above configuration, by spraying the inert gas toward the holes, oxidation of the resin precipitate generated around the holes in the one or more molds can be prevented. Therefore, in the event that the resin deposits generated around the holes adhere to the extruded strands, the physical properties of the strands are never reduced. As a result, there is provided an advantage that by cutting the strand into a predetermined length, it is possible to produce a pellet having a better quality than the pellet produced by the prior art.

According to the above configuration, solidification of the resin precipitate generated around the holes in the one or more molds can be prevented. Therefore, it is possible to provide an advantage that the mixing of the solidified products can be prevented in the case where the solidified portion is not produced.

According to the above configuration, it is possible to provide an advantage that the work efficiency with respect to, for example, changing the mold or maintaining the forming apparatus can be remarkably increased as compared with the prior art.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing an example of a configuration of a high-temperature inert gas spraying device, showing an embodiment of a method and apparatus for forming a strand of the present invention. Moreover, FIG. 2 is a schematic view showing an example of a manner in which a high-temperature inert gas spraying device is used, FIG. 3 is an exemplary perspective view of the gas spraying unit, FIG. 4 is an exemplary figure showing a configuration of the heater, and FIG. 5 is a view An illustration of an exemplary state near the holes in the mold, and FIG. 6 is an exemplary perspective view of the granules that are not considered to have deteriorated quality.

In Fig. 1, the strand forming device is constructed to include a mixer and a high temperature inert gas spraying device 4, in which the mixed composite is extruded through the die 1 into a strand 2 The high-temperature inert gas spraying device 4 is used for spraying nitrogen gas (although nitrogen gas is used as an inert gas in this embodiment, but other inert gas other than nitrogen gas may be sprayed) into the mold 1. A plurality of holes 3 are provided to fill the periphery of the holes 3 with nitrogen gas. Although not specifically shown, a rotary cutter is provided on the downstream side of the strand forming device for cutting the strands 2 extruded from the holes 3 into a predetermined length to produce pellets.

A plurality of holes 3 are formed in the mold 1. These plurality of holes 3 are formed to be aligned at a predetermined interval on one horizontal line. In this embodiment, ten circular holes 3 are formed (as an example).

The high temperature inert gas spraying device 4 is constructed to be capable of spraying high temperature nitrogen gas to the respective holes 3 in the mold with a uniform gas flow. As a specific example, the high temperature inert gas spraying device 4 includes a pair of gas spraying units 5, a damper 6, and a heater 7. Further, as shown in FIG. 2, the high temperature inert gas spraying device 4 includes a moving arm 9 having an angle adjusting mechanism 8 and a moving mount 10.

In Figs. 1 and 3, the pair of gas spraying units 5 are each formed into a cylindrical shape, and are elongated in a direction in which the holes 3 are aligned in the mold 1. The pair of gas spraying units 5 are closed at one end of the cylinder, and are joined to the corresponding connecting tubes 11 at the other end of the cylinder. A plurality of gas spray holes 12 of a predetermined size are formed in the respective gas spray units of the gas spray unit 5 at predetermined intervals. The plurality of gas spray holes 12 are formed in an open shape at positions where they are fitted to the respective holes 3 in the mold 1. One end of the gas supply pipe 13 is connected to the connection pipe 11. The pair of gas spraying units 5 of the present embodiment are formed to have heat resistance.

The pair of gas spraying units 5 are attached to the angle adjusting mechanism 8 mounted on the end of the moving arm 9. The pair of gas spraying units 5 are adjusted to an optimum spray angle with respect to the plurality of holes 3 in the mold 1.

The high-temperature inert gas spraying device 4 of the present embodiment is placed not only in the vicinity of the mold 1 when the strands 2 are formed, but also in the operation of replacing the mold 1 or the maintenance strand forming device, as shown in Fig. 2 Show away from the mold 1. The structure of the high-temperature inert gas spraying device 4 of the present embodiment has taken the work efficiency into consideration. This high-temperature inert gas spraying device 4 is formed as a movable device by using the moving carriage 10.

In FIG. 1, the other end of the gas supply pipe 13 is connected to the damper 6. The damper 6 includes an air flow regulating valve for regulating the flow of nitrogen. The damper valve can be used separately. In addition, the damper valve can electrically control the flow rate of nitrogen by using a control unit.

In FIGS. 1 and 4, a heater 7 for heating, for example, nitrogen at a normal temperature, which is supplied through the gas supply pipe 14, is provided. The high-temperature nitrogen gas heated by the heater 7 is supplied to the damper 6 through the gas supply pipe 15. To describe a specific example of the heater 7, as shown in FIG. 4, the heater 7 includes a gas heater 16, a temperature regulator 17, and a wire 18.

The gas heater 16 includes: a substantially tubular tubular portion 19, a spiral gas passage 20 formed in the tubular portion 19, and a strip heater disposed on the periphery of the tubular portion 19 ( The heat transfer medium 21 and a rod-shaped heater (heat transfer medium) 22 which is disposed inside the tubular portion 19 more than the spiral gas passage 20. The spiral gas passage 20 is a passage for heating nitrogen gas, and, in the present embodiment, although not particularly limited, the passage is formed in a spiral shape so as to extend as long as possible.

The normal temperature nitrogen gas supplied through the gas supply pipe 14 is first heated to a high temperature by the strip heater 21 and the rod heater 22, while nitrogen gas is passed through the spiral gas passage 20, and then supplied to the damper 6. Further, the temperature at which the nitrogen gas is to be heated is preferably a temperature at which the resin precipitate 23 (refer to Fig. 5) generated around the holes 3 in the mold 1 does not solidify.

The temperature regulator 17 is provided as a means for adjusting the temperatures of the strip heater 21 and the rod heater 22. In this embodiment, commercially available components are used as the temperature regulator 17, the wire 18, the ribbon heater 21, and the rod heater 22.

In the above configuration, the normal temperature nitrogen gas is heated to a high temperature by the heater 7, and the thus heated nitrogen gas passes through the damper 6, whereby high-temperature nitrogen gas which can adjust the gas flow and temperature is provided. Then, the supplied nitrogen gas is sent to a pair of gas spraying units 5 so as to be sprayed from there toward the respective holes 3 in the mold 1 as shown in Fig. 5 (toward the opening side opening of the holes 3). By using this method, the periphery of the holes 3 in the mold 1 is filled with high-temperature nitrogen gas, and the strands 2 are formed by being extruded from the respective holes 3 while preventing oxidation of the resin precipitate 23 The resulting fading of the resin precipitate 23 is caused.

Since the high-temperature nitrogen gas is filled around the hole 3, the resin precipitate 23 is never oxidized or solidified.

In contrast to the conventional strand forming device in which the scrap or residue of the resin composite used adheres to the pores in the mold and produces a resin precipitate which is increasingly oxidized, the present invention prevents The resin precipitate is discolored, so that the resulting granules have an improved quality. Further, as can be seen from the above, since the strand forming device of the present invention does not require a casing filled with an inert gas and does not require a large space, the configuration of the strand forming device can be It is made simpler than the conventional strand forming device.

Further, the present invention can be constructed to supply normal temperature nitrogen gas to a pair of gas spraying units 5. At this time, no heater 7 is used. If no heater 7 is used, it is possible that the resin precipitate generated on the periphery of the holes 3 in the mold solidifies. However, even if the resin precipitate solidifies, since the resin precipitate thus solidified is not at all like those of the resin precipitate which has been oxidized, if the solidified resin precipitate is mixed into the generated strand, it will not Because the resin precipitate is mixed into the strands, it causes poor quality. Fig. 6 shows a pellet 25 which is manufactured to have a resin precipitate 24 adhered thereto. However, since the resin precipitate 24 is not oxidized and thus does not fade, the resulting granules 25 naturally maintain the same color as the composite, and they do not have the above-mentioned quality problems.

In addition, the present invention may of course be modified in other ways without departing from the spirit and scope thereof.

(industrial applicability)

According to the present invention, there is proposed a method and apparatus for forming a strand which is capable of sufficiently ensuring the quality of the granules produced, and which does not require a housing for filling an inert gas, and does not require a large space.

1. . . Mold

2. . . Strand

3. . . Hole

4. . . High temperature inert gas spraying device

5. . . Gas spray unit

6. . . Air flow regulator

7. . . Heater

8. . . Angle adjustment mechanism

9. . . Moving arm

10. . . Mobile mount

11. . . Connecting pipe

12. . . Gas spray hole

13. . . Gas supply pipe

14. . . Gas supply pipe

15. . . Gas supply pipe

16. . . Gas heater

17. . . temperature regulator

18. . . metal wires

19. . . Tubular part

20. . . Spiral gas channel

twenty one. . . Strip heater

twenty two. . . Rod heater

twenty three. . . Resin precipitate

twenty four. . . Resin precipitate

25. . . Granular

BRIEF DESCRIPTION OF THE DRAWINGS Figures 1A and 1B are diagrams showing an example of the configuration of a high-temperature inert gas spraying device, illustrating an embodiment of the method and apparatus for forming a strand of the present invention.

Fig. 2 is a schematic view showing an example of a manner in which a high-temperature inert gas spraying device is used.

Figure 3 is an exemplary perspective view of a gas spray unit.

Figure 4 is an exemplary diagram showing the configuration of the heater.

Fig. 5 is an explanatory view illustrating an exemplary state in the vicinity of the holes in the mold.

Fig. 6 is an exemplary perspective view of a granular material which is not considered to have deteriorated quality.

1. . . Mold

2. . . Strand

3. . . Hole

5. . . Gas spray unit

12. . . Gas spray hole

twenty three. . . Resin precipitate

Claims (2)

A strand forming method comprising the steps of extruding from a hole disposed in one or more molds to form a strand, and simultaneously spraying an inert gas toward the hole, wherein the inert gas is heated and sprayed, and at the same time, the non-reactive gas is adjusted A stream of reactive gases. A strand forming device comprising: a mold having a plurality of holes; a gas spraying unit disposed near the hole to spray an inert gas toward the holes; a heater for heating the inert gas; and a damper for And adjusting the flow of the inert gas, wherein the heater and the damper are disposed upstream of the gas spraying unit.