JPH11254430A - Manufacture of molding resin material and its device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method for manufacturing a molding resin material of superior quality for preventing the mixture into discharged gut of an eye-mucus-like material under the stabilized operation. SOLUTION: Molten resin is discharged on the gut shape out of a cap 1 and gut G is pelletized to manufacture a molding resin material in a manufacturing method and a device thereof. 150-450 deg.C steam is jetted jetted out of jet holes 2 at the ratio of 10-50 NI/minute per one jet hole and 50-100 m/second jet velocity in parallel with the jet direction of gut G jetted out of the vicinity of the discharge holes 2 of the cap 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for producing a molding resin material used as a resin material for injection molding and the like, and more particularly to a method for mixing a greasy material into a gut discharged from a die. The present invention relates to a method and an apparatus for producing a molding resin material that prevents the occurrence of a resin and ensures stable operation.

[0002]

2. Description of the Related Art Conventionally, as a method for producing a raw material resin (molding resin material) used for injection molding, extrusion molding and the like, there are known methods.
Attach a die to a polymerization can that polymerizes a polymer from a monomer, or attach a die to an extruder or kneader that mixes and kneads various kinds of fillers and additives with a polymer, and forms a molten resin through the discharge hole of the die. And a method of cutting the gut into pellets.

However, when the molten resin is discharged from the die for a long period of time, so-called garnish-shaped colored foreign matter (hereinafter abbreviated as garniture) adheres and accumulates near the outlet of the discharge hole. This cane-like material is a sublimate of residual monomers and residual oligomers in the resin, a condensate of volatile components of various additives, or a resin composition itself, which is thermally degraded. It adheres and accumulates near the discharge hole of the base.

[0004] If the operation is continued while such a metal-like material adheres and accumulates in the vicinity of the discharge hole of the base, the discharge hole will eventually be clogged and the gut will be cut off, and the operation will become unstable.
In addition, a part of the scum-like material comes off and adheres or mixes into the gut being discharged. When pellets (molding resin material) obtained by pelletizing the gut with the adhered or mixed greasy substances in this way are subjected to injection molding, etc., the greasy substances appear on the surface of the molded product, deteriorating the product appearance, and deteriorating the commercial value. There was a problem of letting it.

Japanese Unexamined Patent Publication No. 5-220813 proposes a method of spraying a heated gas to a base discharge hole so as to be opposed to a gut discharge direction as a countermeasure against the above-mentioned mist-like material. According to this method, the scum-like material generated in the vicinity of the discharge hole is certainly removed, and although it is effective in preventing the scum-like material from being mixed into the molded product, the heated gas is blown so as to face the gut discharge direction. As a result, the heated gas colliding with the base surface generates turbulence, which may cause unnecessary shaking to the gut and cause the gut to break, and thus cannot always be said to guarantee a stable operation.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a molding resin capable of preventing the mixing of the scum-like material into the discharge gut and obtaining a high quality molding resin material in a stable operation. An object of the present invention is to provide a method and an apparatus for manufacturing a material.

[0007]

In order to achieve the above object, the present invention provides a method for discharging molten resin from a die in a gut shape,
In the manufacturing method, the gut is pelletized into a molding resin material. In the vicinity of the discharge hole of the die, steam having a temperature of 150 to 450 ° C. is discharged in parallel with the gut discharge direction from the discharge hole per discharge hole. The jetting is performed at a jetting speed of 10 to 50 Nl / min and a jetting speed of 50 to 100 m / sec.

As described above, since steam having a temperature of 150 to 450 ° C. is ejected in parallel with the direction of the gut discharged from the base discharge hole, stable operation can be ensured without shaking the gut. Can be prevented from being clogged or adhered to the gut. Further, the manufacturing apparatus for a molding resin material according to the present invention, which carries out the above, discharges the molten resin in a gut shape from a die and pelletizes the gut into a molding resin material. A steam spout is opened around the hole, and the spouting direction of the steam spout is set parallel to the discharge direction of the gut discharged from the discharge hole.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, "molding resin material"
The term “resin” refers to a raw material resin pelletized when a molded article is formed by injection molding, extrusion molding, or the like. The resin material for molding is composed of a single resin alone or a resin composition (resin alloy) in which two or more different resins are mixed.
And a resin composition obtained by mixing a reinforcing resin, a filler, an additive, and the like with a single resin or a resin alloy.

[0010] As the resin used for the molding resin material,
There is no particular limitation as long as it is a meltable thermoplastic resin. For example, polyamides such as nylon 6 and nylon 66 (P
A), polyesters such as polybutylene terephthalate (PBT) and polyethylene terephthalate (PET);
Polyphenylene sulfide (PPS), liquid crystalline polyester (LCP), polycarbonate (PC), ABS,
Resins such as polypropylene (PP) can be used. The effect is particularly large when applied to nylon 6, nylon 66, and PBT, and the polymer content is 30%.
% Of the resin composition for molding has an effect.

[0011] The die used in the present invention is not particularly limited as long as it has a discharge hole for discharging the molten resin in a gut shape. One or a plurality of discharge holes may be provided in the base, but a plurality of discharge holes are particularly preferably provided in a row. The spinneret does not include a spinneret for discharging a fiber having a smaller thickness than a gut or a die for discharging a thin film.

The present invention discharges a molten resin in a gut shape from a mouthpiece discharge hole in order to prevent the scum-like material from being mixed into the discharge gut, and provides the molten resin in the vicinity of the discharge hole in parallel with the gut discharge direction. The heated steam is spouted from the steam outlet. Since the direction in which the steam is jetted is parallel to the direction in which the gut is discharged, the discharge flow of the gut can be stabilized without giving a swing or the like.

The steam outlet may be a slit or a plurality of holes, but the slit is preferably used in order to obtain a uniform jet flow. The position of the steam outlet is not particularly limited as long as it is near the gut discharge hole,
It may be provided directly on the base or may be provided independently of the base. However, in order to stably maintain the steam temperature, it is preferable to directly provide the base. Further, it is preferable that the steam outlet is arranged so as to surround the gut discharge hole in a polygonal or concentric manner. More preferably, the position of the steam outlet is 10 mm from the gut discharge hole.
It is good to provide in the area within.

The temperature of the steam is 150 to 450
° C, preferably in the range of 250-350 ° C. 150
C. or more, especially the temperature of the molten resin discharged from the mouthpiece discharge hole, effectively prevents clogging of the mouthpiece discharge hole. Further, by setting the temperature of the steam to 450 ° C. or less, softening and thermal deterioration of gut are suppressed. Further, rapid cooling crystallization is performed after the gut discharge, so that debris that may cause dust is not generated due to friction near the discharge holes.

[0015] The amount of steam to be ejected is set to 10 Nl / min to 50 Nl / min per discharge hole. If the steam ejection amount is less than 10 Nl / min per discharge hole, as the gut discharge time elapses, a sublimate-like scum-like material is likely to be deposited near the discharge hole. Also,
If the steam ejection amount is more than 50 Nl / min, even if steam is ejected in parallel with the gut discharge direction, the gut is likely to be cut and the operation tends to be unstable.

The steam ejection speed is 50 to 10
The range is 0 m / sec. If the ejection speed is lower than 50 m / sec, it is difficult to blow off the slime-like material that is to be attached to the vicinity of the ejection hole. In particular, for the glass-like material generated during the production of the molding resin material of the glass fiber reinforced resin,
It is important that the jet velocity of the steam be 50 m / sec or more. On the other hand, if the ejection speed is higher than 100 m / sec, even if the steam is ejected in a direction parallel to the gut discharge direction, the gut is likely to occur.

FIGS. 1A and 1B illustrate an apparatus for carrying out the method of manufacturing a molding resin material according to the present invention, and FIGS. 2A and 2B show the apparatus of FIG. The main part of the base used is shown. In the apparatus shown in FIG. 1, a die 1 is attached to a discharge portion of an extruder 9, and a resin bath melted and kneaded in the extruder 9 is used as a plurality of rows of guts G from the die 1 to form a cooling bath 10. Is discharged into the cooling water 11 of
Cooled and solidified. The gut G that has been cooled and solidified is subsequently conveyed to a pelletizer (not shown), and is pelletized to become a molding resin material (pellet).

As shown in FIG. 2, a cap 1 for gut discharge is provided.
A plurality of discharge holes 2 are provided in a row at the front end, and an inflow hole 3 is provided at the back. The molten resin flows in from the inflow hole 3 on the back, and is discharged in a gut shape from the discharge hole 2 on the front end. A steam introduction groove 4 is provided inside the base 1, and the steam introduction groove 4 communicates with a slit-shaped steam outlet 5 provided so as to surround the discharge hole 2.

The steam introduction groove 4 is connected to a steam introduction pipe 7 shown in FIG. 1, and steam is supplied through the steam introduction pipe 7. The steam introduction pipe 7 is provided with a heater 8 at a position close to the base 1, and when the steam is heated by the heater 8, the temperature at which the steam is ejected from the steam outlet 5 is 150 to 450 ° C., preferably 2 to 450 ° C.
It will be in the range of 50-350 ° C. In this case, it is preferable that the steam to be supplied to the heater 8 is heated to around 120 to 130 ° C. in advance. If the temperature is lower than the preheating temperature, it may be difficult to raise the temperature to a required temperature of 150 to 450 ° C. before being introduced into the die 1.

The steam outlet 5 has a slit shape in the illustrated example, and is arranged so as to surround the periphery of the discharge hole 2 so that the steam is uniformly applied to each of the plurality of discharge holes 2. ing. The steam outlet 5 is preferably provided in a region within 10 mm from the discharge hole 2 as described above. If the steam jet port 5 is located at a position more than 10 mm from the discharge hole 2, the steam diffuses after jetting and the temperature decreases, so that the gut-like molten resin is rapidly cooled and solidified near the discharge hole 2, and Blockage may be more likely.

As described above, the steam injection amount from the steam injection port 5 is 10 Nl / min.
It is adjusted to the range of N1 / min. If the amount is less than 10 Nl / min, a sublimate-like scum-like material tends to accumulate near the ejection holes as the ejection time elapses. Also, 50Nl
If it is more than / minute, it tends to cause a gut break. The steam ejection speed is 50 to 100 as described above.
m / s. If the speed is lower than 50 m / sec, it is difficult to blow off the slime-like material from the discharge holes 2. On the other hand, if the speed is higher than 100 m / sec, a gut break tends to occur.

According to the manufacturing process of the molding resin material of the present invention, as described above, the heating steam at 150 to 450 ° C. is supplied at a flow rate of 10 Nl / min to 50 Nl / min per discharge hole.
By jetting in parallel to the gut discharge direction at a jet speed of 50 to 100 m / min, the atmosphere containing a large amount of sublimates and volatiles near the mouth of the mouthpiece can be constantly updated. It is possible to prevent the condensate of the nature from adhering and accumulating on the outlet of the base.

[0023]

EXAMPLE A resin composition was prepared by mounting a base having a discharge hole diameter of 3 mm and a discharge hole number of 15 at the discharge part of a twin-screw extruder, and mixing 70 parts by weight of polybutylene terephthalate (PBT) and 30 parts by weight of short glass fibers. Was melt-kneaded and discharged in a gut shape, which was cut into pellets.

At this time, the amount of the mixture in the product was measured by weight. The results are shown in Table 1. Of the levels described in Table 1, levels Nos. 5, 7, 8, and 11 correspond to the embodiments of the present invention, and levels Nos. 1, 2, 3, 4,
6, 9, 10, and 12 are comparative examples.

[0025]

[Table 1]

As is evident from Table 1, at levels No. 1, 4 and 6 where the amount of steam jetted is less than 10 Nl / min, the mixing ratio of the scum to the product is 14 to irrespective of the steam temperature. It reached 15 ppm, a level that could not be used as a product. In the case of steam No. 2 and 3 where the steam temperature is lower than 150 ° C, if the amount and speed of steam blown are reduced to the point where the scum is not blown off or deposited, the discharge hole of the base is clogged and the operation continues. It became impossible.

As shown in Level Nos. 9, 10, and 12, the steam temperature is set to a value as high as 250 which does not cause clogging of the nozzle outlet.
Even when the temperature was set to 0 ° C. or 400 ° C., when the steam ejection amount exceeded 50 Nl / min per ejection hole or when the ejection speed exceeded 100 m / sec, it was impossible to continue the operation due to frequent cuts. On the other hand, the steam temperature was set to 15
0-450 ° C, ejection amount is 10-50N per discharge hole
In Nos. 5, 7, 8, and 11 (Examples) in which the jetting speed was in the range of 50 to 100 m / sec, the clogging of the discharge holes and the breakage of the gut did not occur. The amount mixed into the product was also zero.

[0028]

As described above, according to the present invention, for a gut discharged from a die discharge hole, steam at 150 to 450 ° C. is applied in parallel to the discharge direction of the gut at 10 to 50 Nl / min per discharge hole. Since the jetting is performed at a jetting speed of 50 to 100 m / sec, stable operation can be ensured without giving any shaking to the gut, and at the same time, clogging of the discharge holes and attachment or mixing of the greasy matter into the gut can be prevented. Can be.

[Brief description of the drawings]

FIG. 1A is a schematic view illustrating an apparatus for carrying out a method for producing a molding resin material of the present invention, and FIG. 1B is an enlarged view of a portion B in FIG.

FIG. 2 shows a main part of a base used in the apparatus of FIG. 1,
(A) is a front view, (B) is a rear view, and (C) is a view on arrow AA in FIG. (A).

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Cap 2 Outlet 3 Inlet 4 Steam introduction groove 5 Steam outlet 7 Steam introduction pipe 8 Heater 9 Extruder 10 Cooling bath 11 Cooling water G gut

Claims (3)

[Claims] 1. A molten resin is discharged in a gut shape from a mouthpiece.
In the manufacturing method, the gut is pelletized into a molding resin material. In the vicinity of the discharge hole of the die, steam having a temperature of 150 to 450 ° C. is discharged in parallel with the gut discharge direction from the discharge hole per discharge hole. A method for producing a molding resin material which is jetted at a jetting speed of 10 to 50 Nl / min and a jetting speed of 50 to 100 m / sec. 2. A steam discharge port is opened in a region within 10 mm from a discharge hole of the base, and steam is discharged from the steam discharge port in parallel with a gut discharge direction.
3. The method for producing a molding resin material according to item 1. 3. A molten resin is discharged in a gut shape from a mouthpiece.
In a manufacturing apparatus for pelletizing the gut into a resin material for molding, a steam jet port is opened around a gut discharge hole of the die, and the jet direction of the steam jet port is changed to a discharge direction of a gut discharged from the discharge hole. Production equipment for molding resin material set in parallel with.