JP6418857B2 - Extruder and method for producing thermoplastic resin composition strand using the same - Google Patents

Description

  The present invention relates to a die plate and a method for producing a thermoplastic resin composition strand using the die plate.

  When a thermoplastic resin composition is formed into a strand shape using an extruder having a die plate mounted on the die portion, mayani (also referred to as a die flower or die-cass) may occur around the orifice opening of the die plate. Are known. Mayani accumulates in the manufacturing process of the resin composition, and the accumulated mayani deteriorates and solidifies due to heat, and may be mixed as a foreign substance in the strand, which may deteriorate the quality of the thermoplastic resin composition strand to be produced. is there.

  In order to deal with this problem, a scraper removing device has been developed. For example, Patent Document 1 discloses a technique for blowing out generated sag by wind pressure. According to this technique, since anyone can easily arrange the mean removal device at a pinpoint, the mean can be effectively removed.

  In Patent Document 2, in a die plate of an extruder, the mechanism of heating the die plate (particularly, the opening side portion of the orifice) and the mechanism of vibrating the strand with gas are provided, thereby generating the occurrence of the main body itself. Techniques for suppressing the above are disclosed.

JP 2014-034200 A JP 2003-220607 A

  However, although the technique of Patent Document 1 can remove the generated mean, it cannot suppress the occurrence of the mean. The technique of Patent Document 2 further prevents the occurrence of the mean. There was room for suppression.

  Then, an object of this invention is to provide the manufacturing method of the thermoplastic resin composition strand using the die plate which makes it possible to suppress effectively generation | occurrence | production of the spear which generate | occur | produces in a die plate.

  As a result of intensive studies, the inventor has formed a thermoplastic resin composition into a strand shape using an extruder equipped with a die plate. The present inventors have found that the above-mentioned problems can be advantageously solved by using a broken die plate, and the present invention has been completed.

The gist of the present invention is as follows.
[1] An extruder in which a die plate is mounted on a die part,
The die plate has a die plate main body , an orifice provided inside the main body, and a mean removing device at an opening of the orifice ,
The inner diameter of the orifice is 2.0 to 8.0 mm, and the ratio of the length of the orifice to the inner diameter is 1.0 to 8.0;
A die plate characterized in that 25% or more of the surface area of the die plate is covered with a heat insulating cover.
[2] The extruder according to [1], wherein the die plate further includes a heating unit at an end of the orifice on the opening side.
[3] The extruder according to [2], wherein the heating unit is embedded in the die plate body.
[4] The extrusion according to [3], wherein the heating unit is located in an extending direction of the orifice from an end on the opening side of the orifice, and is 20 to 80% of a length in the extending direction of the orifice. Machine.
[5] The extruder according to any one of [2] to [4], wherein the distance from the center of the heating unit to the orifice is 2 to 10 times the inner diameter of the orifice.
[6] A method for producing a thermoplastic resin composition strand using the extruder according to any one of [1] to [ 5 ].

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the thermoplastic resin composition strand using the die plate which makes it possible to suppress effectively generation | occurrence | production of the spear which generate | occur | produces in a die plate can be provided.

(A) is a front view of the die plate of this embodiment. (B) is a side view of the die plate of this embodiment. (C) is a side view of only the main body portion of the die plate of the present embodiment. (D) is a figure which shows sectional drawing of the die plate of this embodiment by the surface which follows the line II shown to (A) only about the opening part vicinity of an orifice. It is a figure shown about the outline | summary of the manufacturing method of the thermoplastic resin composition strand of this embodiment using the extruder with which the die plate of this embodiment was mounted | worn.

  Hereinafter, modes for carrying out the present invention (hereinafter simply referred to as “the present embodiment”) will be described in detail with reference to the drawings as necessary. The following embodiments are examples for explaining the present invention, and are not intended to limit the present invention to the following contents. And this invention can be deform | transformed suitably and implemented within the range of the summary. In the drawings, positional relationships such as up, down, left and right are based on the positional relationships shown in the drawings unless otherwise specified.

(Die plate)
1A is a front view of the die plate of the present embodiment, FIG. 1B is a side view of the die plate of the present embodiment, and FIG. FIG. 1 (D) shows a sectional view of the die plate according to the present embodiment along the line II shown in FIG. 1 (A). Only the vicinity of the opening is shown.
The die plate 1 (hereinafter also simply referred to as “die plate 1”) of the present embodiment is provided inside the die plate main body 1b and the main body 1b and penetrates from one end 1e1 to the other end 1e2 of the die plate 1. And a space 1i. The internal space 1i is composed of one storage space 1s and one or a plurality of rows (10 rows in FIG. 1) of orifice rows 1oL each composed of a plurality of (10 in FIG. 1) orifices 1o. Including.

  The die plate 1 of the present embodiment is used by being mounted on a die part (described later) of an extruder used for producing a thermoplastic resin composition, and when the die plate 1 is mounted on a die part of the extruder. The extruded thermoplastic resin composition passes through the storage space 1s and the orifice 1o, and is discharged from the opening 1oo of the orifice 1o. The thermoplastic resin composition is extruded from the one end 1e1 side of the die plate 1 of the present embodiment toward the other end 1e2 side.

Here, in the die plate 1 of this embodiment, 25% or more of the surface area needs to be covered with the heat insulating cover 2.
The surface area of the die plate 1 refers to the outer surface area of the die plate main body 1b forming the inner space 1i. For example, the surface area of the inner surface 1oi of the storage space 1s and the orifice 1o or the outer surface of the member attached to the die plate main body 1b. The surface area is not included.

  In addition, the die plate in this invention points out the general apparatus with which the die part of an extruder is mounted | worn in order to shape | mold a thermoplastic resin composition and to prepare the strand 20. FIG. However, the die plate in the present invention is not necessarily an apparatus separated from the die part, and may be an apparatus integrated with the die part. The die plate in the present invention particularly refers to an apparatus having an orifice (1o in FIG. 1) having an inner diameter (r1o in FIG. 1) of 2.0 to 8.0 mm.

  According to the die plate 1, the entire die plate 1 is kept warm. From this, the following effects can be obtained.

When the thermoplastic resin composition is molded using the die plate 1, it is in a molten state when the temperature of the inner surface 1 oi of the orifice 1 o is lower than the temperature of the thermoplastic resin extruded from the storage space 1 s to the orifice 1 o. The resin is rapidly cooled by contact with the inner surface 1oi of the orifice 1o. This cooling increases the friction between the resin and the inner surface 1oi of the orifice 1o, and increases the amount of Meani (shown by the dotted line in FIG. 1D) generated at the opening 1oo of the orifice 1o.
Here, in the die plate 1 of this embodiment, since a predetermined ratio or more of the surface area is covered with the heat insulating cover 2, the heat radiation from the die plate is suppressed, and the temperature of the die plate body 1b forming the orifice 1o is lowered. Can be suppressed. Therefore, according to the die plate 1, the occurrence of the mains generated on the die plate can be effectively suppressed.

When the thermoplastic resin composition is formed into a strand shape using an extruder equipped with a die plate, the orifice 1o located near the end in the orifice row 1oL is the orifice located near the center in the orifice row 1oL. Since heat dissipation is higher than 1 oc, the temperature at the orifice 1 os near the end in the orifice row 1 oL tends to be lower than the temperature at the orifice 1 oc near the center. Therefore, in particular, the strand 20 discharged from the opening 1oo of the orifice 1os located near the end in the orifice row 1oL is likely to be curled (twisted).
Here, in the die plate 1 of the present embodiment, the entire die plate 1 is kept warm and the above-described temperature difference is unlikely to occur, so that the strands 20 can be supplied stably.

When the thermoplastic resin composition is formed into a strand shape using an extruder equipped with the die plate 1, the die plate 1 is placed in an exposed state, so that the surface temperature of the die plate 1 is likely to be lowered. Also, the internal temperature of the die plate 1 is likely to decrease. Therefore, it becomes difficult to supply the strand 20 from the orifice 1o until the temperature difference between the molten thermoplastic resin composition and the inner surface 1oi of the orifice 1o of the die plate 1 becomes small. Therefore, a predetermined amount of the resin composition is consumed before the strand 20 is stably obtained.
Here, in the die plate 1 of the present embodiment, as described above, since the entire die plate 1 is kept warm, the temperature between the temperature of the thermoplastic resin composition in a molten state and the internal temperature of the die plate 1 is obtained. The difference (as the index, the temperature difference between the set temperature of the die plate 1 set to be the same as the temperature of the resin and the surface temperature near the center of the die plate 1 and / or the surface temperature near the end) It can be made small in the extending direction of the orifice row 1oL and the extending direction of the orifice 1o, and the strand 20 can be stably supplied from the orifice 1o. Thereby, the loss of resin until the strand 20 is obtained can be reduced. For example, since the temperature difference cannot be reduced only by heating a part of the die plate 1 (the opening 1oo side portion of the orifice 1o), the effect of reducing the resin loss cannot be obtained.

  From the viewpoint of enhancing the effect of the present invention, in the die plate 1 of the present embodiment, it is preferable that 25% or more of the surface area is covered with the heat insulating cover 2, and 30% or more is covered with the heat insulating cover 2. More preferably, 50% or more is most preferably covered with the heat insulating cover 2.

  The shape of the die plate of the present invention is not limited to the shape of the die plate 1 of the present embodiment shown in FIG. 1, and has a die plate main body 1b, an internal space including a storage space 1s and an orifice row 1oL. As long as it can be any shape.

  The die plate 1 shown in FIG. 1 may further include an arbitrary member such as a handle member or a fixing member 10.

The die plate 1 shown in FIG. 1 is captured in six views, and the six surfaces are the upper surface, the lower surface, both side surfaces, the front surface (the upper surface in FIG. 1A), and the rear surface (the paper surface in FIG. 1A). In the case of the lower surface), the die plate 1 can be covered with a heat insulating cover 2 on the five surfaces including the upper surface, the lower surface, both side surfaces, and the front surface except for the rear surface mounted on the die portion of the extruder. Is possible. In addition, when each surface has an unevenness | corrugation, the surface of the unevenness | corrugation shall also be included in a surface.
Here, in the die plate 1, from the viewpoint of sufficiently obtaining the effect of the present invention described above, it is preferable that four or more of the five surfaces are covered with the heat insulating cover 2, and the entire five surfaces are the heat insulating cover 2. More preferably, it is covered.

The heat insulating cover 2 includes a heat insulating material having a heat insulating effect.
As a heat insulating material, glass wool, limestone, etc. are mixed, melted at a high temperature to be fiberized, fiber mainly composed of alumina or silica, foam made of blast furnace slag as a raw material and heat resistant resin A body etc. are preferable and a glass wool is especially preferable from a heat resistant viewpoint.

  In the present invention, the heat insulating cover 2 that covers all or part of the surface of the die plate 1 may be attached to the surface of the die plate 1 using an adhesive or the like, and is attached to the die plate 1 using a stainless steel member. May be. In the present invention, a glass wool mat appropriately processed as the heat insulating cover 2 may be used to cover the entire die plate 1 with this.

The number of orifice rows 1oL is preferably one or two rows.
The number of orifices 1o per orifice row is not particularly limited, and is preferably a number obtained by dividing the extrusion amount (kg / hr) of the entire die plate 1 by 5 to 40 kg / hr.
The orifices 1o forming the orifice row 1oL are preferably provided at a predetermined pitch in the parallel direction D1 of the orifices 1o from the viewpoint of making the quality of the strands 20 uniform.
The inner diameter r1o of the orifice 1o is preferably 2.0 mm or more, more preferably 2.5 mm or more, more preferably 8.0 mm or less, and further preferably 7.5 mm or less. It is preferably 6.0 mm or less.
The ratio of the length L1o to the inner diameter r1o is preferably from 1.0 to 8.0, more preferably from 1.5 to 6.0, and more preferably from 1.5 to 4 from the viewpoint of suppressing the occurrence of scum. Is particularly preferred.
The angle formed between the extending direction of the orifice 1o and the horizontal direction is preferably 0 ° or more, more preferably 60 ° or less, and preferably 45 ° or less from the viewpoint of further suppressing the occurrence of mess. More preferably it is.

  The length L1s in the extending direction of the storage space 1s may be 10 to 100 mm.

  Here, the die plate 1 further includes a heating unit 3 at an end 1ot1 on the opening 1oo side of the orifice 1o. According to this configuration, a decrease in the temperature of the inner surface 1oi of the orifice 1o can be suppressed, and the above-described effects of the present invention can be further enhanced.

In the die plate of the present invention, the number of heating units 3 is not particularly limited. For example, one or a plurality of heating units 3 may be provided for each orifice 1o. On the other hand, one or more heating units 3 may be provided, and one or more heating units 3 may be provided for each orifice row 1oL.
In the die plate of the present invention, the heating unit 3 may be externally attached to the die plate main body 1b or may be embedded, and from the viewpoint of efficiently heating the inner surface 1oi of the orifice 1o, the embedded type. It is preferable that
Furthermore, in the die plate of the present invention, the arrangement position at the end of the orifice 1o at the center of the heating unit 3 on the opening 1oo side is not particularly limited. For example, from the viewpoint of reducing the temperature difference between the resin composition and the inner surface 1oi of the orifice 1o, the heating unit 3 extends from the end of the orifice 1o on the opening 1oo side in the extending direction of the orifice 1o. It is preferable that the position is 20 to 80% of the length L1o, where the lower limit is more preferably 30%, and the upper limit is more preferably 70%. The central portion of the heating unit 3 refers to the center of the heating unit 3 in the cross-sectional view of the die plate 1 taken along the surface along the extending direction of the orifice 1o. Further, for example, the heating unit 3 is preferably provided so as to sandwich the orifice 1o above and below the orifice 1o in the gravity direction.
Furthermore, in the die plate of this invention, it does not specifically limit as a shape of the heating part 3, For example, cylindrical shape, prismatic shape, spherical shape etc. are mentioned.
Furthermore, in the die plate of the present invention, the distance LL to the orifice 1o at the center of the heating unit 3 is not particularly limited, and is preferably at least twice the inner diameter r1o of the orifice 1o, for example, at least three times. More preferably, it is preferably 10 times or less, and more preferably 8 times or less. The distance from the center of the heating unit 3 to the orifice 1o indicates the shortest linear distance.
Examples of the heating unit 3 include a cartridge heater.

  In the die plate 1 shown in FIG. 1, two columnar heating units 3 (31, 32) are provided for one orifice row 1oL. Here, each heating unit 3 extends along the parallel direction of one row of orifices 1oL, and is embedded in the die plate body 1b so as to sandwich one orifice 1o above and below the direction of gravity of each orifice row 1oL. Provided.

In the die plate 1 shown in FIG. 1, the strand 20 discharged from the orifice 1o has a rope shape with a diameter of 1 to 8 mm.
The take-up speed of the strand 20 may be 5 to 200 m / min.

  The heating unit 3 controls the output of the heating unit 3 according to the temperature detected by the temperature detection unit (for example, a temperature detection sensor) that detects the temperature of the die plate 1 or the temperature detection unit, as necessary. It may have a temperature control unit (for example, a temperature control device). Here, from the viewpoint of performing more detailed temperature control, the temperature detection unit is preferably embedded above the opening 1oo of the orifice 1o of the die plate 1 and may also serve as a thermometer for the die plate 1. .

Here, the die plate 1 further includes a scraping removing device 4 at the opening 1oo of the orifice 1o.
According to this configuration, it is possible to suppress the occurrence of the mains in the opening 1oo of the orifice 1o of the die plate, and to suppress the accumulated mains from being deteriorated and solidified by heat and mixed into the strand 20 as a foreign substance. Can do.

  Examples of the mean removal device 4 used in the present invention include, but are not limited to, a type that blows off the generated mean by wind pressure, and a type that suppresses the occurrence of mean by giving a slight vibration to the strand 20.

  In the die plate 1 shown in FIG. 1, the mean removal device 4 is a type that blows off the generated mean by wind pressure, a gas storage header 4 s that blows the gas G to the strand 20 discharged from the opening 1 oo of the orifice 1 o, A heater 4h for heating the gas G sent to the gas storage header 4s, a gas flow meter 4f for measuring the flow rate of the gas G sent to the heater 4h, and a pipe through which the unheated and heated gas G can be passed. 4p.

  Here, examples of the gas G include air, nitrogen, carbon dioxide, and the like, and air is preferable from the economical viewpoint.

The number of gas storage headers 4s is not particularly limited and may be any number.
One gas storage header 4s is provided in such a manner that the gas storage header 4s is externally attached to the die plate main body 1b so as to extend along the parallel direction of one orifice row 1oL.
The gas storage header 4s has a hole 4sp for blowing the heated gas G. The hole diameter may be 0.5 to 3.0 mm. Examples of the shape of the hole 4sp in plan view include a circle, an ellipse, and a quadrangle. The holes 4sp are provided in accordance with the pitch in the parallel direction of the orifices 1o.
The gas storage header 4s is fixed to the die plate 1 by being held by the gas storage header mounting portion 4sh fixed to the die plate body 1b by fixing using bolts or nuts, welding, or the like.

Examples of the heater 4h include an electric heater. In particular, an electric heater that can raise the temperature of the gas G from room temperature to about 650 ° C. in a short time (for example, a spot heater SH manufactured by Taketsuna Manufacturing Co., Ltd.). Series) is preferred.
The temperature of the gas G that is heated by the heater 4h and is sent to the gas storage header 4s is preferably 0 ° C. or higher, and more preferably 20 ° C. or higher, from the viewpoint of effectively suppressing the generation of the mains. It is preferably 650 ° C. or lower, more preferably 550 ° C. or lower, and particularly preferably 500 ° C. or lower.

Examples of the gas flow meter 4f include a flow meter.
The flow rate of gas sent to the heater 4h is preferably 5 L / min or more per orifice in terms of 23 ° C. and 0.1 MPa, from the viewpoint of effectively suppressing the occurrence of sag, and 100 L / min. Or less, more preferably 90 L / min or less, and particularly preferably 80 L / min or less.

  Examples of the material of the pipe 4p include metals, and stainless steel is particularly preferable.

(Extruder)
FIG. 2 shows an extruder equipped with the die plate of this embodiment.
The extruder 5 to which the die plate of the present embodiment can be attached is not particularly limited, and for example, a multi-screw extruder such as a single screw extruder, a kneader type extruder, a twin screw extruder or the like. Etc.
Examples of the single screw extruder include a single screw extruder provided with a kneading screw.
Examples of the kneader type extruder include a Kneader manufactured by Buss.
Examples of the twin-screw extruder include a non-meshing type counter-rotating twin-screw extruder, a meshing type counter-rotating twin-screw extruder, and a co-rotating twin-screw extruder (for example, ZSK Megacon series and Megaplus series manufactured by Coperion) MC18 series; TEM BS series, SS series, SX series manufactured by Toshiba Machine Co., Ltd .; TEX α series, α2 series, α3 series, etc. manufactured by Nippon Steel Works).

The extruder 5 is preferably equipped with 0 to 3 side feeders, 0 to 6 degassing vents (for example, atmospheric vent, vacuum vent), and 0 to 3 liquid additive nozzles.
The length (not shown) in the extending direction of the extruder 5 may be 20 to 70 times the screw diameter (not shown) of the extruder 5. Here, the screw diameter of the extruder 5 is 30. It may be ˜400 mm.

The die portion 5d of the extruder 5 is not particularly limited and may be any type.
As the volume of the die portion 5d, when the volume is too large, the molten thermoplastic resin composition accumulates in the vicinity of the inner wall, and the accumulated resin composition is deteriorated and solidified, which may cause the occurrence of scum. The volume is preferably such that the residence time is 5 to 60 seconds.
In particular, when a thermoplastic resin composition containing no filler is used, it is preferable that the die portion 5d is mounted with a plate having an opening 1oo whose shape in plan view is a honeycomb shape, which is called a breaker plate. It is preferable that a 20th to 200th mesh is attached upstream of the plate. However, the breaker plate does not need to be mounted when there is little heat-degraded material generated.
When a thermoplastic resin composition containing a filler is used, it is preferable that the mesh is not attached to the die portion 5d from the viewpoint of avoiding clogging.
An automatic screen changer may be attached to the die portion 5d.

(Method for producing thermoplastic resin composition strand)
In FIG. 2, the outline | summary of the manufacturing method of the thermoplastic resin composition strand of this embodiment using the extruder with which the die plate of this embodiment was mounted | worn is shown.
The manufacturing method of the thermoplastic resin composition strand of this embodiment requires using the die plate of this embodiment.

  In the method for producing the thermoplastic resin composition strand of the present embodiment, the die plate of the present embodiment is used, for example, by mounting it on the die portion 5d of the extruder 5, and the thermoplastic resin and filler in the extruder 5 are used. The thermoplastic resin composition is prepared by melt-kneading the additive to prepare a thermoplastic resin composition, and forming the strand 20 by molding the thermoplastic resin composition in the die plate of this embodiment. The product strand 20 can be manufactured.

  As shown in FIG. 2, the thermoplastic resin composition strand 20 manufactured by the above manufacturing method may then be cooled in a strand bath 6 containing appropriately temperature-adjusted water, and the cooled strand 20 is further cooled. The pellets 7 may be cut into pellets 21 of an appropriate length by cutting the pellets 7, and the pellets 21 may be passed through a vibrating screen to remove the elongated or continuous pellets 21 and the powder generated by the cutting. Good.

  The thermoplastic resin used in the method for producing the thermoplastic resin composition strand of the present embodiment is not particularly limited, and examples thereof include polyphenylene ether resins (polyphenylene ether, polyphenylene ether, and polystyrene resins (described later) and Blends), polystyrene resins (general purpose polystyrene, high impact polystyrene, acrylonitrile / styrene copolymers, acrylonitrile / butadiene / styrene copolymers, etc.), polycarbonates, polyolefin resins (polypropylene resins, polyethylene resins, etc.) , Homopolyoxymethylene, Copolymer polyoxymethylene, Polyphenylene sulfonide, Polyamide resin, Polyamideimide, Polyarylate, Polyarylsulfone, Polyethers Examples include at least one selected from the group consisting of phon, polyetherimide, polytetrafluoroethylene, and polyetherketone, and in particular, from polyphenylene ether resins, polystyrene resins, polypropylene resins, polyphenylene sulfides, and polyamide resins. It is preferably at least one selected from the group consisting of

  The filler used in the method for producing the thermoplastic resin composition strand of the present embodiment is not particularly limited, and examples thereof include glass fiber, carbon fiber, metal fiber, potassium titanate whisker, magnesium sulfate whisker, and aluminum borate. Whisker, calcium carbonate whisker, silicon carbide whisker, zinc oxide whisker, calcium silicate (wollastonite), mica, talc, glass flake, calcium carbonate, clay, kaolin, barium sulfate, silica, alumina, magnesium oxide, magnesium sulfate At least one selected from the group consisting of glass fiber, carbon fiber, calcium silicate, mica, talc, glass flake, calcium carbonate, kaolin, and silica.

  The additive used in the method for producing the thermoplastic resin composition strand of the present embodiment is not particularly limited, and examples thereof include liquid additives (oil, water, etc.), powder filler dispersants (ethylene bisamide, Calcium stearate, zinc stearate, stearic acid, etc.), elastomers, functional group imparting agents (maleic acid, fumaric acid, itaconic acid, maleic anhydride, malic acid, citric acid, etc.), various colorants, coloring adjuvants (titanium oxide) Etc.), ultraviolet absorbers, antistatic agents, stabilizers (zinc oxide, zinc sulfide, phosphorus-based, sulfur-based, hindered phenol-based, etc.).

  The thermoplastic resin composition strand 20 manufactured by the thermoplastic resin composition strand manufacturing method of the present embodiment includes an OA material (printer, copying machine, etc.), an electronic material, an optical material, a battery case material, a battery cell material, It is suitably used for films, sheets and the like.

  As described above, the embodiment of the die plate of the present invention and the method for producing a thermoplastic resin composition strand using the same according to the present invention has been described with reference to the drawings. The invention is not limited to the exemplary embodiments described above.

  EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not limited to the following Example at all.

It describes below about the manufacturing method of the die plate of an Example , a reference example, and a comparative example, and a thermoplastic resin composition strand using the same.

(Die plate)
A die plate that can be covered with a heat insulating cover was used on five surfaces including an upper surface, a lower surface, both side surfaces, and a front surface except for the rear surface mounted on the die portion of the extruder shown in FIG.

-Orifice-
Number of orifice rows: 1, number of orifices per orifice row: 20, orifice pitch: 10.0 mm, orifice inner diameter: 4 mm, length of orifice in its extending direction: 15 mm.
-Thermal insulation cover-
Insulating material: Glass wool (Super Wool Mat manufactured by ASUKA Corporation).
-Heating part-
Heating part: cartridge heater (500 W), number of heating parts: 2 (upper and lower orifices), heating part shape: cylindrical shape, arrangement of heating part: embedded type, position of heating part: end of orifice on opening side From the position of the orifice in the extending direction of the orifice to 55% of the length in the extending direction of the orifice, the distance from the center of the heating part to the orifice: 2.5 times the inner diameter of the orifice, the set temperature of the heating part: 280 ° C.
-Temperature detector, temperature controller-
Temperature detector: J-type thermocouple with a detection range of 0 to 400 ° C. embedded in a hole provided above the die plate.
Temperature control unit: Digital temperature indicator adjuster (SA200 manufactured by Rika Kogyo Co., Ltd.).
-Meani removal device-
-Gas storage header-
Gas: Air, number of gas storage headers: 1, number of holes: 20, hole pitch: 10.0 mm, hole diameter: 1 mm, plan view shape of holes: circular.
--- Heater--
Electric heater (Spot heater SH31 manufactured by Takezuna Manufacturing Co., Ltd.), temperature of gas sent to gas storage header: 450 ° C.
--- Gas flow meter--
Flow meter, maximum 833L / min.
−−Piping−−
Pipe made of SUS304.

(Extruder)
As the extruder, a biaxial co-rotating extruder (TEM58SS (12 barrels) manufactured by Toshiba Machine Co., Ltd.) was used.
The barrel configuration was as follows.
No. 1 barrel: First supply port (top feed barrel, heavyweight feeder A)
No. 2 barrels: transfer zone no. 3 barrels: No. 1 kneading zone 4 barrels: No. 1 kneading zone 5 barrels: Air vent No. 6 barrels: second supply port (side feed barrel, heavyweight feeder B)
No. 7 barrel: Second kneading zone No. 8 barrels: No. 3 supply port 9 barrels: No. 3 kneading zone 10 barrels: vacuum vent 11 barrel: Liquid barrel No. 12 barrels: closed barrel Set temperature of the barrel: 280 ° C, set temperature of the die part: 280 ° C.

(Method for producing thermoplastic resin composition strand)
-Thermoplastic resin-
S201A / 685 master batch: polyphenylene ether (S201A manufactured by Asahi Kasei Plastics Singapore) / General Purpose Polystyrene (PS Japan General Purpose Polystyrene 685) = 80/20.
CT60: High impact polystyrene (CT60 manufactured by Petrochemical Co.).
-Filler-
ECS03T-249: Glass fiber (ECS03T-249 manufactured by Nippon Electric Glass Co., Ltd.).
-Other facilities-
Strand bath: Water temperature 40 ± 3 ° C.
Pelletizer: pellet length 2.5 ± 0.3 mm, pellet shape: cylindrical shape.

(Evaluation method)
(1) Generated amount of scallops In the manufacture of thermoplastic resin composition strands using the die plates of the following examples , reference examples and comparative examples, the size of the squirts generated at the orifice opening of the die plate is determined with a caliper. And measured. The determination was performed according to the following criteria.
<Judgment criteria (determined by “judgement point: state of Meani”)>
1: Mayan generation amount is less than 1 mm in length in 10 minutes 2: Mayan generation amount is less than 3 mm in length in 10 minutes 3: Mayan generation amount is not more than 5 mm in 10 minutes 4: Generation of mayani The amount is 10 mm or less in length of 10 minutes in 5 minutes. 5: The amount of generated seal is 15 mm or less in length in 10 minutes. 6. The amount of generated spears is less than 20 mm long in 10 minutes. The amount of the generated sea urchin is 10 minutes or less in 10 minutes. The amount of generated sea urchins exceeds 30 mm in 10 minutes in 10 minutes.

(2) Loss of resin until strands are obtained In the production of thermoplastic resin composition strands using the die plates of the following examples , reference examples and comparative examples, the number of revolutions of the extruder is constant (500 rpm), When the supply amount of the extruder is constant (500 kg / hour), the strand is cooled by a strand bath, and the amount of the thermoplastic resin composition discharged until the pellet can be pelletized by a pelletizer is determined. The resin loss (kg) until a strand was obtained.

(3) Strand stability In the production of the thermoplastic resin composition strands using the die plates of the following examples , reference examples and comparative examples, the strands discharged from the orifices located at both ends in the orifice row are curled. Those in which (twist) did not occur were determined as “stable”, and those in which curl (twist) occurred were determined as “unstable”.

(4) Die plate temperature In the production of thermoplastic resin composition strands using the die plates of the following examples , reference examples and comparative examples, the temperature detection part of the heating part is used as a thermometer of the die plate, The temperature of the plate was measured. The set temperature of the die plate is 280 ° C.

(5) Temperature difference between the surface temperature near the center of the die plate and the surface temperature near the end In the production of the thermoplastic resin composition strands using the die plates of the following examples , reference examples and comparative examples, Thermometer (handy-type thermometer HD-manufactured by Anri Keiki Co., Ltd.) at a position 2 cm below the midpoint of the orifices at both ends and a position 2 cm below the orifice at the left end when viewed from the front of the die plate 1100), the surface temperature of the die plate at both positions was measured, and the temperature difference between the two surface temperatures was calculated.

( Reference Example 1)
The ratio of the surface area of the die plate covered with the heat insulating cover was 35.0%, and the surfaces of the die plate covered with the heat insulating cover were five surfaces: the upper surface, the lower surface, both side surfaces, and the front surface. No cartridge heater was used, and no scraper removing device was used. 50 parts by mass of the S201A / 685 master batch is supplied from the weight type feeder A of the biaxial co-rotating extruder, and CT6050 parts by mass of the weight type feeder B of the extruder is supplied to produce a thermoplastic resin composition strand. did. About the said manufacture, evaluation of above-mentioned (1)-(5) was performed. Detailed conditions and evaluation results are shown in Table 1.

( Reference Examples 2 to 6, Example 7, Comparative Examples 1 to 6)
A thermoplastic resin composition strand was produced using a die plate in the same manner as in Reference Example 1 except that the conditions shown in Table 1 were used. Detailed conditions and evaluation results are shown in Table 1.

By comparing the reference examples 1 to 4 and the comparative examples 1 to 6, if the ratio of the surface area of the die plate covered with the heat insulating cover is 25.0% or more, the occurrence of the mains is suppressed, and the strands It was shown that the loss of the resin until it is obtained can be reduced and the strands can be supplied stably.
In particular, by comparing Reference Examples 1 to 4 and Comparative Example 3, the temperature of the die plate is maintained at the set temperature when the heat insulating cover is not used, the cartridge heater is used, and the meander removing device is not used. Although it was possible, the temperature difference between the surface temperature near the center and near the left end of the die plate was increased, and it was shown that the amount of generated resin and the resin loss until a strand was obtained increased.
In particular, by comparing the reference examples 1 to 4 and the comparative example 4, when the heat removal cover is not used, the cartridge heater is not used, and the scraper removing device is used, the temperature of the die plate decreases from the set temperature. It was shown that the temperature difference between the surface temperature near the center of the plate and the vicinity of the left end increased, and the amount of scum generation and resin loss until a strand was obtained increased greatly.
By comparing the reference examples 5 and 6 with the reference examples 1 to 4, it was shown that when the cartridge heater was used, the amount of generated scum was further reduced.
Further, by comparing Example 7 with Reference Examples 5 and 6 (especially Reference Example 6), it was shown that the amount of generated scum was further reduced when the scouring device was used in addition to the cartridge heater. .

  ADVANTAGE OF THE INVENTION According to this invention, the die plate which suppresses generation | occurrence | production of the scrap which generate | occur | produces in a die plate, reduces the loss of the resin until a strand is obtained, and makes it possible to supply a strand stably, and the same are used. A method for producing a thermoplastic resin composition strand can be provided. The thermoplastic resin composition strand is suitably used for OA materials, electronic materials, optical materials, battery case materials, battery cell materials, films, sheets and the like.

1: die plate 1b: die plate body 1e1: one end 1e2 of die plate: other end 1i of die plate: internal space 1s: storage space 1o: orifice 1oc: orifice 1os near the center: orifice 1oi near the end: inner surface of the orifice 1oo: Orifice opening 1ot1: Orifice opening side end 1oL: Orifice row 2: Thermal insulation cover 3: Heating unit 31: Heating unit 32: Heating unit 4: Meani removal device 4s: Gas storage header 4sh: Gas storage Header mounting part 4sp: Hole 4h: Heater 4f: Gas flow meter 4p: Pipe 5: Extruder 5d: Die part 6: Strand bath 7: Pelletizer 10: Fixing member 20: Thermoplastic resin composition strand 21: Pellet D1: Orifice parallel direction r1o: Orifice inner diameter L1o: E Length L1s in the extending direction of the reface: Length LL in the extending direction of the storage space: Distance G to the orifice at the center of the heating unit G: Gas

Claims (6)

An extruder having a die plate mounted on a die part,
The die plate has a die plate main body , an orifice provided inside the main body, and a mean removing device at an opening of the orifice ,
The inner diameter of the orifice is 2.0 to 8.0 mm, and the ratio of the length of the orifice to the inner diameter is 1.0 to 8.0;
An extruder wherein 25% or more of the surface area of the die plate is covered with a heat insulating cover.   The extruder according to claim 1, wherein the die plate further includes a heating unit at an end of the orifice on the opening side.   The extruder according to claim 2, wherein the heating unit is embedded in the die plate body.   4. The extruder according to claim 3, wherein the heating unit is located in an extending direction of the orifice from an end on the opening side of the orifice and is 20 to 80% of a length in the extending direction of the orifice.   The extruder according to any one of claims 2 to 4, wherein a distance from a central portion of the heating unit to the orifice is 2 to 10 times an inner diameter of the orifice. The manufacturing method of the thermoplastic resin composition strand using the extruder as described in any one of Claims 1-5 .

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