WO2012131980A1 - Method for producing thermoplastic resin composition pellet, extruder, and die plate - Google Patents
Method for producing thermoplastic resin composition pellet, extruder, and die plate Download PDFInfo
- Publication number
- WO2012131980A1 WO2012131980A1 PCT/JP2011/058223 JP2011058223W WO2012131980A1 WO 2012131980 A1 WO2012131980 A1 WO 2012131980A1 JP 2011058223 W JP2011058223 W JP 2011058223W WO 2012131980 A1 WO2012131980 A1 WO 2012131980A1
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- WIPO (PCT)
- Prior art keywords
- die plate
- gas
- opening
- strand
- thermoplastic resin
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/911—Cooling
- B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/04—Particle-shaped
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/05—Filamentary, e.g. strands
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/02—Making granules by dividing preformed material
- B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92723—Content, e.g. percentage of humidity, volatiles, contaminants or degassing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92971—Fluids, e.g. for temperature control or of environment
Definitions
- the present invention relates to a method for producing a thermoplastic resin composition pellet, an extruder, and a die plate.
- Screw extruders include single-screw or multi-screw extruders, and general ones are equipped with screws, cylinders (sometimes called barrels), drive units, heating / cooling units, etc. Corresponding die plates are attached.
- thermoplastic resin composition When the thermoplastic resin composition is molded using an extruder, the thermoplastic resin composition adheres and stays around the discharge holes of the die plate to form a lump called “Meani”. This mayani is carbonized and discolored.
- the scum gradually accumulates and accumulates near the discharge holes of the die plate for the extruder. If left as it is, the carbonized mayani adheres to the strand-like extrudate. This may become a foreign substance in the final product and may deteriorate the quality. Moreover, due to this meany, strand breakage or the like may occur, and stable operation may not be possible.
- the present invention has been made in order to solve the above problems, and the purpose of the present invention is to prevent the build-up of deposits near the discharge holes of the die plate for the extruder, thereby reducing the quality of the product or stable molding.
- the object is to provide a technique for suppressing problems such as obstruction.
- thermoplastic resin composition in a molten state is molded using an extruder including a die plate having discharge holes that are discharged in a strand shape, and a first gas spraying section that sprays gas onto the discharged strand-shaped material. It has been found that the above problems can be solved by doing so.
- gas is blown from the first gas blowing portion to at least a part of the boundary line between the extruded strand-like material and the upper portion of the opening, and the die plate is on the discharge surface of the die plate,
- the shortest distance from the lower end of the opening of the discharge hole to the outer periphery of the die plate is found to be 2 mm or more and 5 mm or less, thereby finding that the above problems can be solved, and the present invention has been completed.
- the present invention provides the following.
- thermoplastic resin composition pellet using an extruder, wherein the molten thermoplastic resin composition is extruded in a strand form from a discharge hole of a die plate provided in the extruder.
- the gas is blown onto at least a part of the boundary line between the extruded strand-like material and the upper part of the opening on the discharge surface side of the discharge hole, and from the lower end of the opening of the discharge hole on the discharge surface of the die plate,
- the shortest distance to the outer periphery of a die plate is 2 mm or more and 5 mm or less,
- the manufacturing method of the thermoplastic resin composition pellet characterized by the above-mentioned.
- At least a part of the boundary line is a part including a boundary point between the upper end of the opening and the strand-like object, and further includes a boundary point between the lower end of the opening and the strand-like object.
- a notch is formed on the discharge surface of the die plate, and the notch is formed below the position of the opening on the discharge surface, and the lower end of the opening and the strand
- the gas blown to a part including the boundary point passes through the space notched by the formation of the notch, and the method for producing the thermoplastic resin composition pellets according to (2).
- An extruder comprising: a die plate having discharge holes for discharging a molten thermoplastic resin composition in a strand shape; and a first gas spraying portion for spraying a gas to the discharged strand-like material,
- the shortest distance from the lower end of the opening of the discharge hole to the outer periphery of the die plate on the discharge surface of the die plate is 2 mm or more and 5 mm or less, and the gas spraying portion is a strand of thermoplastic resin composition in a molten state
- a second gas spraying unit that sprays a gas from below the position of the opening on the discharge surface toward a part including a boundary point between the lower end of the opening and the strand-like object is further provided (4 ) Or the extruder according to (5).
- a notch is formed on the discharge surface, the notch is formed below the position of the opening on the discharge surface, and the gas blown from the second gas blowing portion is The extruder as described in (6) which passes the space notched by formation of the notch part.
- a die plate having discharge holes for discharging the molten thermoplastic resin composition in a strand shape, from the lower end of the discharge hole opening to the outer periphery of the die plate on the discharge surface of the die plate A die plate whose shortest distance is 2 mm or more and 5 mm or less.
- the problem that the scum accumulated near the discharge hole in the discharge surface of the die plate for an extruder deteriorates the quality of the product or inhibits stable molding is a problem in the prior art. It can be greatly reduced compared to.
- Drawing 1 is a figure showing typically the section of extruder 1 of this embodiment.
- the extruder 1 includes a hopper 10, a cylinder 11, a screw 12, a die plate 13, a first gas spraying part 14, and a second gas spraying part 15.
- the screw 11 is disposed inside the cylinder 11. Further, the cylinder 11 is provided with a hopper 10 for supplying the thermoplastic resin composition 2 at the base of the screw 12 at an upstream end portion, and a die plate 13 is connected to a downstream short portion.
- thermoplastic resin composition 2 supplied from the hopper 10 is conveyed in the direction of the die plate 13 through the space between the cylinder 11 and the screw 12 by the rotation of the screw 12. In the course of this conveyance, the thermoplastic resin composition 2 is melted by the shearing force received from the cylinder 11 and the screw 12. The molten thermoplastic resin composition 2 is discharged from the die plate 13 in a strand shape.
- the strand-like thermoplastic resin composition 2 (hereinafter sometimes referred to as a strand-like material) is sprayed with gas from the first gas spraying portion 14 immediately after being discharged. Moreover, gas is sprayed from the 2nd gas spraying part 15 toward the die plate 13 which discharges the thermoplastic resin composition person 2.
- FIG. 2A and 2B are diagrams schematically showing the die plate 13, wherein FIG. 2A is a perspective view, FIG. 2B is a front view, and FIG. 2C is a side view.
- the die plate 13 includes a discharge hole 130 for discharging the molten thermoplastic resin composition 2 in a strand shape, and a notch 131.
- the discharge hole 130 penetrates the discharge surface A and the surface opposite to the discharge surface A.
- the thermoplastic resin composition 2 flows into the discharge hole 130 in a molten state from the opening on the surface opposite to the discharge surface A, and the thermoplastic resin composition 2 is extruded in a strand form from the opening on the discharge surface A side.
- the opening on the discharge surface A side of the discharge hole 130 exists on the discharge surface A.
- the opening on the discharge surface A side and the opening on the opposite surface are present at opposite positions, but the positional relationship between the openings present at both ends of the discharge hole 130 is not particularly limited.
- the discharge hole 130 is a linear hole extending in the direction in which the thermoplastic resin composition 2 flows.
- the discharge hole 130 may extend in a direction shifted by a predetermined angle from the direction in which the thermoplastic resin composition 2 flows. It may be other than a straight line. Therefore, the position of the opening existing on the surface opposite to the discharge surface A and the shape of the flow path through which the thermoplastic resin composition 2 passes can be appropriately set.
- FIG. 2 demonstrated the case where the discharge hole 130 was one, the die plate which has multiple discharge holes 130 may be sufficient.
- the shortest distance is preferably 2 mm or more and 5 mm or less for all the discharge holes.
- gas is sprayed from the 1st gas spraying part and the 2nd gas spraying part with respect to the thermoplastic resin composition 2 discharged from all the discharge holes.
- the 1st gas spraying part and the 2nd gas spraying part may be comprised from the several gas spraying part.
- the notch 131 is a stepped notch formed on the discharge surface A.
- the notch 131 is formed in a step shape so as to penetrate the two side surfaces that connect the discharge surface A and the opposite surface.
- the notch 131 has a notch as long as it does not impair the effects of the present invention described later.
- the shape of the part 131 is not particularly limited.
- FIG. 3 is a diagram schematically illustrating a state in which gas is sprayed from the first gas spraying portion 14 toward the strand-shaped object.
- the first gas blowing unit 14 is disposed above the position of the opening of the discharge hole 130 on the discharge surface A. And the position of the gas outlet is adjusted so that the first gas spraying part 14 can spray gas to at least a part on the boundary line between the extruded strand-like material and the upper part of the opening on the discharge surface A.
- the boundary line between the extruded strand-like material and the upper part of the opening on the discharge surface A refers to the boundary line between the outer periphery of the semicircle above the opening and the strand-like material.
- at least a part of the boundary line includes a boundary point between the upper end of the opening and the strand-like object.
- the kind of gas sprayed is not specifically limited, The atmosphere, an inert gas, etc. can be illustrated.
- the gas which the 1st gas spraying part 14 sprays may have humidity and temperature adjusted. Adjustment of humidity and temperature can be performed by a conventionally known control method. Further, the gas flow rate can also be adjusted as appropriate within a range that provides the effects described below.
- the gas wind pressure is preferably adjusted to 1 kgf / cm 2 or more and 4 kgf / cm 2 or less.
- a more preferable wind pressure is 1 kgf / cm 2 or more and 3 kgf / cm 2 or less.
- the shortest distance from the gas blowing port of the first gas blowing unit 14 to the strand-like object is not particularly limited, but is 20 cm or less in the present embodiment. By being 20 cm or less, cooling of the die plate 13 due to the expansion of the gas injection range can be suppressed.
- the angle ⁇ 1 formed by the gas outlet of the first gas blowing section 14, the straight line connecting the upper end of the opening and the boundary point between the strands, and the discharge surface A is in the range of 0 ° to 90 °. However, it is preferably adjusted in the range of 0 ° or more and 60 ° or less. However, in the present invention, it is more important to apply gas to the boundary line between the extruded strand-like material and the upper part of the opening on the discharge surface A than the spray angle.
- FIG. 4 is a diagram schematically showing a state in which gas is sprayed from the second gas spraying portion 15 toward the boundary point between the lower end of the opening present on the discharge surface and the strand-like material.
- the second gas spraying portion 15 is disposed below the position of the opening of the discharge hole 130 on the discharge surface A.
- a straight line connecting the gas blowing port of the second gas blowing unit 15 and the boundary point, and extrusion of the extruder angle theta 2 formed by the straight line along the direction is appropriately adjusted within a range that the effect of the present invention, preferably 100 ° or more 150 ° or less.
- the distance between the gas blowing port of the second gas blowing unit 15, the upper end of the opening, and the boundary point between the strands is 20 cm or less. The closer the distance is, the smaller the area irradiated with the gas, and the cooling of the die plate 13 can be suppressed.
- the gas blown from the gas blowing unit 15 passes through a space surrounded by a two-dot chain line.
- the space surrounded by the two-dot chain line refers to a space that is notched due to the formation of the notch 131.
- the kind of gas that can be used is the same as that of the first gas spraying unit 14. Moreover, humidity and temperature may be adjusted. Further, the wind pressure and the like can be appropriately adjusted within a range that does not impair the effects described below.
- the gas wind pressure is preferably adjusted to 1 kgf / cm 2 or more and 5 kgf / cm 2 or less. If it is 1 kgf / cm 2 or more, it is preferable because it is cooled and easily peels off from the die plate. If it is 5 kgf / cm 2 or less, the resin composition is prevented from being clogged in the discharge holes by cooling the die plate. Is preferable. More preferred wind pressure is 1.5 kgf / cm 2 or more 3.5 kgf / cm 2 or less.
- the predetermined time interval may be a fixed interval or may not be a fixed interval.
- the predetermined time interval can be adjusted as appropriate.
- the thermoplastic resin composition 2 contains a thermoplastic resin.
- the thermoplastic resin is not limited as long as it is plasticized by applying shear rate or heat.
- the extruder of the present invention can be suitably used for extrusion molding of a thermoplastic resin having a high melting point such as engineering plastics and high metal adhesion.
- the thermoplastic resin having a high melting point is a thermoplastic resin having a melting point of 150 to 400 ° C., and specifically, polyamide, polyester, polyphenylene sulfide, and liquid crystalline polymer are preferable, and polyphenylene sulfide is particularly preferable.
- thermoplastic resins various compounding agents, and the like can be added to the thermoplastic resin composition 2 as necessary, as long as the effects of the present invention are not impaired.
- examples of other resins include other polyolefin resins, polystyrene resins, and fluororesins. These other resins may be used alone or in combination of two or more.
- the compounding agents include stabilizers (antioxidants or antioxidants, ultraviolet absorbers, heat stabilizers, etc.), reinforcing agents such as glass fibers, antistatic agents, flame retardants, flame retardant aids, colorants ( Dyes, pigments, etc.), lubricants, plasticizers, lubricants, mold release agents, crystal nucleating agents, anti-dripping agents, crosslinking agents and the like.
- fibrous reinforcing agents are preferable, and inorganic fibers or organic fibers such as glass fibers, ceramic fibers, carbon fibers, and metal-coated glass fibers are used.
- the surface of these fibrous fillers may be surface-treated with a silane compound or the like. In these, an inorganic fiber, especially glass fiber are preferable from a heat resistant point.
- the extruder may be an extruder having a single screw or a multi-screw or a combination of these. Further, when the extruder is a multi-screw extruder, the rotation direction of the screw may be different or the same in each axis, and may be a meshing type or a non-meshing type. Furthermore, the shape of the shaft may be a parallel type or a conical type, and in addition, a tandem system in which screw extruders are combined in multiple stages may be used.
- the thermoplastic resin composition can be extruded by incorporating the part.
- thermoplastic resin composition 2 is put into the hopper 10.
- the thermoplastic resin composition 2 charged into the hopper 10 enters the cylinder 11.
- the thermoplastic resin composition 2 is conveyed in the direction toward the die plate 13 by passing between the screw 12 and the cylinder 11 by the rotation of the screw 12.
- the thermoplastic resin composition 2 is melted in the middle of conveyance in the direction of the die plate 13 and is sent to the die plate 13 in a molten state.
- the thermoplastic resin composition 2 sent to the die plate 13 is discharged through the discharge hole 130.
- the extrusion molding conditions discharge amount, screw rotation speed, cylinder temperature, etc.
- Gas is blown from the first gas blowing section 14 to at least part of the boundary line between the extruded strand-like material and the upper opening on the discharge surface A side of the discharge hole 130.
- gas is blown onto a portion including a boundary point between the upper end of the opening and the strand-like object. The spraying of the gas promotes the generation of the mains. Most of the generated spears fall due to the wind pressure of the gas.
- the gas is intermittently blown from the second gas blowing portion 15 to the boundary point between the strand-like material and the lower end of the opening existing on the discharge surface. Even if this gas blows and adheres to the vicinity of the lower end of the opening, it will fall before carbonization.
- the 1st gas spraying part 14 accelerates
- This main sticking sticks to the discharge surface A, and normally carbonizes and becomes black black.
- gas is blown onto at least a part of the boundary line between the extruded strand-like material and the upper opening on the discharge surface A side of the discharge hole 130.
- the mains are blown off by the wind pressure of the gas.
- the gas is quickly blown off with the gas, whereby the trap is prevented from being accumulated on the discharge surface A and being carbonized. Further, as described above, the gas from the first gas spraying portion 14 is blown before Mayani is carbonized. As a result, there is no problem of foreign matter contamination even if the blown-out spider enters the pellets obtained by cutting the strand-like material. In addition, the mayani may be peeled off due to its own weight.
- the mess adhering to the vicinity of the ejection hole 130 of the die plate 13 may fall due to friction with the strands being ejected and may be mixed into the strands being ejected. is there.
- the above-described fall due to the friction of the sealant adhering to the discharge hole 130 is promoted.
- Meani falls and mixes into the strand-like material. That is, there is a tendency that the main body drops in a short time after adhering to the discharge hole 130 and is mixed into the strand-like material. For this reason, even if Meyani mixes in the pellet obtained by cutting a strand-like thing, the problem of a foreign material mixing does not arise.
- the second gas blowing unit 15 is provided.
- the second gas spraying portion 15 By providing the second gas spraying portion 15, even if the main body accumulates in the vicinity of the lower end of the opening on the discharge surface A side, by blowing gas to the boundary point between the strand-shaped object and the lower end of the opening, Can be blown away early. Therefore, there is almost no possibility that the main body is carbonized on the discharge surface A.
- the mayani stuck to the vicinity of the lower end of the opening on the discharge surface A side can be dropped by the gas sprayed from the first gas spraying part 14, it is more reliable by including the second gas spraying part 15. It can be dropped before discoloration.
- the shortest distance ( ⁇ x) between the lower end P of the outer periphery of the opening on the discharge surface A and the outer periphery of the discharge surface A is 5 mm or less. For this reason, the contact area between the ejection surface A and the main surface is reduced. As a result, since the adhesive force between the mains and the discharge surface A is reduced, the mains can be easily dropped by blowing the gas from the second gas spraying part 15 in particular. Therefore, even if Meyani mixes in the product manufactured using the pellets obtained by cutting the strand-like material as a raw material, there is no problem of contamination.
- the shortest distance is 2 mm or more. However, if the distance is less than 2 mm, problems such as insufficient strength of the mold occur. Therefore, even if it is less than 2 mm, the effect of the manufacturing method of this embodiment is exhibited.
- the above-described effect obtained by the gas blown from the second gas blowing unit 15 is sufficiently exerted even when the gas is blown intermittently. Further, by intermittently blowing the gas, it is possible to shake the main body that is partially attached to the discharge surface A and suspended from the discharge surface A, and to drop the main body. Moreover, it can suppress that the die plate 13 is cooled by spraying gas intermittently. By suppressing the cooling of the die plate 13, problems such as unstable ejection can be suppressed.
- a cutout portion is formed on the discharge surface A, and the cutout portion is formed below the position of the discharge hole 130 on the discharge surface A.
- the gas sprayed from the 2nd gas spraying part 15 passes the space notched by formation of the notch part. That is, the second gas blowing unit 15 blows gas toward the outer periphery of the die plate 13 from an obliquely downward direction. Therefore, the gas blowing unit 15 is disposed below the die plate 13.
- the second gas spraying portion 15 may be disposed below the strand-like material. However, if the second gas spraying portion 15 is disposed at such a position, the strand shape is broken when the strand breaks.
- the problem which the sensor which notifies strand breakage does not operate may arise.
- this problem can prevent damage to a sensor etc. from fall of the broken strand-like thing by protecting the sensor which notifies a 2nd gas spraying part and strand breakage with a protection member.
- the second gas spraying portion 15 may be disposed at a position slightly away from the die plate 13 and the gas may be sprayed to the outer periphery of the die plate 13 without passing through the space formed by the notches.
- the second gas spraying part 15 is disposed behind the discharge surface A, and the gas sprayed from the second gas spraying part 15 passes through the space cut out by the formation of the notch part. Gas passes.
- the second gas blowing portion 15 may be disposed in front of the discharge surface A. In this case, the protective member as described above may be required.
- the first gas blowing unit 14 blows gas from above the position of the discharge hole 130 on the discharge surface A.
- the first gas spraying unit 14 may spray gas from the right direction or the left direction to the strand-like material to be discharged.
- the first gas spraying unit 14 is used for all the discharge holes. In order to blow the gas so as to achieve the effects of the invention, it is preferable to blow the gas from above.
- Die plate 1 The die plate shown in FIG. 2, and the distance between the PQs is 2 mm. Moreover, the opening part of a discharge hole is circular with a diameter of 3 mm. Die plate 2: A die plate similar to the die plate 1 except that the notch 131 is not provided (since it does not have a notch, the distance corresponding to the distance between PQs of the die plate 1 is 5 mm or more. Yes, specifically 50 mm.)
- Extruder A first gas spraying part and a second gas spraying part were arranged in a twin screw extruder (Tex65 manufactured by Nippon Steel Works) as shown in FIGS. The shortest distance from the gas outlet of the first gas spraying part to the strand-like object is 5 cm.
- ⁇ Comparative Example 1> The die plate 2 is attached to the extruder. First, 0.45 parts by weight of aminosilane and 0.2 parts of stearic acid ester are added to 59.4 parts by weight of polyphenylene sulfide resin (viscosity 275 Pa ⁇ s, melting point 290 ° C.) on the raw material hopper. The mixture which mix
- polyphenylene sulfide resin viscosity 275 Pa ⁇ s, melting point 290 ° C.
- the molding conditions for extrusion were extrusion molding with an extrusion rate of 200 kg / hour and a screw rotation rate of 270 rpm to produce resin pellets with a thickness of 3 mm.
- the number of colored pellets was measured per 5 kg of resin pellets.
- Example 1 The number of colored pellets was measured in the same manner as in Comparative Example 1 except that the die plate 1 was changed to the die plate 2. Extrusion molding was performed under the conditions of Example 1 above for experiment numbers 241 to 350. The measurement results are shown in FIG.
- Example 2 The number of pellets colored in the same manner as in Example 1 was measured except that gas was blown so as to hit the boundary point between the strand-like material and the lower end of the opening from the second gas blowing portion.
- the second gas blowing unit was set so that air at normal temperature was blown intermittently at a wind pressure of 3 kgf / cm 2 .
- Example 1 According to the results of Example 1 and Comparative Example 1, by combining the shortest distance between the lower end of the outer periphery of the opening on the discharge surface and the outer periphery of the discharge surface and the blowing of gas from above, it depends on Meani It was confirmed that the number of colored pellets can be greatly reduced.
- Example 2 From the results of Example 2 and Example 1, it was confirmed that the number of colored pellets can be suppressed to almost zero by adding gas blowing from below to Example 1 above.
- the resin pellets produced in Examples 1 and 2 were evaluated for general physical properties (specifically, melt viscosity, glass filling amount measurement by incineration of resin pellets and measurement of Ash, tensile strength, bending strength). However, it was equivalent to a resin pellet produced by a general method. That is, in the physical properties of the resin pellets obtained, no influence due to the use of the die plate of the present invention and no influence due to gas blowing were observed.
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- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
Description
図1は、本実施形態の押出機1の断面を模式的に示す図である。押出機1はホッパー10と、シリンダー11と、スクリュー12とダイプレート13と、第一ガス吹き付け部14と、第二ガス吹き付け部15とを備える。 <Extruder>
熱可塑性樹脂組成物2が、ホッパー10に投入される。ホッパー10に投入された熱可塑性樹脂組成物2は、シリンダー11内に入る。熱可塑性樹脂組成物2は、スクリュー12の回転により、スクリュー12とシリンダー11との間を通ることで、ダイプレート13に向かう方向に搬送される。ダイプレート13の方向に向かう搬送途中で、熱可塑性樹脂組成物2は溶融し、溶融状態のまま、ダイプレート13まで送られる。ダイプレート13まで送られた熱可塑性樹脂組成物2は、吐出孔130内を通って、吐出される。この押出成形の成形条件(吐出量、スクリュー回転数、シリンダー温度等)は、材料の種類等に応じて適宜変更することができる。 <The manufacturing method of a thermoplastic resin composition pellet>
The
本実施形態においては、第一ガス吹き付け部14が、熱可塑性樹脂組成物の塊(以下、メヤニと言う場合がある)の形成を促進させる。このメヤニは吐出面Aに貼り付き、通常であれば、炭化して黒色メヤニとなる。しかし、溶融状態の熱可塑性樹脂組成物2をストランド状に押し出す際に、押し出されたストランド状物と吐出孔130の吐出面A側の開口上部との境界線上の少なくとも一部にガスを吹き付けることの効果で、吐出面Aに貼り付く前又は貼り付いたとしても炭化する前に、メヤニがガスの風圧で飛ばされる。このように、黒色メヤニのもととなるメヤニの形成を促進させた後、速やかにガスで吹き飛ばすことで、メヤニが吐出面Aに溜まり、炭化することが抑えられる。
また、上記の通り、第一ガス吹き付け部14からのガスにより、メヤニが炭化する前に飛ばされる。その結果、飛ばされたメヤニが、ストランド状物を切断して得られるペレットに混入したとしても、異物混入の問題は生じない。
なお、メヤニは、自重で剥離し落下する場合もある。 <Effect>
In this embodiment, the 1st
Further, as described above, the gas from the first
In addition, the mayani may be peeled off due to its own weight.
なお、本発明においては、上記最短距離が2mm以上であるが、これは、2mm未満になると金型の強度が不充分になる等の問題が生じるからである。したがって、2mm未満であっても、本実施形態の製造方法の効果は奏される。 In the present embodiment, the shortest distance (Δx) between the lower end P of the outer periphery of the opening on the discharge surface A and the outer periphery of the discharge surface A is 5 mm or less. For this reason, the contact area between the ejection surface A and the main surface is reduced. As a result, since the adhesive force between the mains and the discharge surface A is reduced, the mains can be easily dropped by blowing the gas from the second
In the present invention, the shortest distance is 2 mm or more. However, if the distance is less than 2 mm, problems such as insufficient strength of the mold occur. Therefore, even if it is less than 2 mm, the effect of the manufacturing method of this embodiment is exhibited.
また、第二ガス吹き付け部15をダイプレート13から少し離れた位置に配置して、切り欠きにより形成される空間を通さずに、ダイプレート13の外周にガスを吹き付けてもよいが、このような方法を採用すると、吐出面に貼り付いたメヤニを落下させるために強い風圧が必要になるだけでなく、ガスの噴射範囲が広がることでダイプレート13を冷却してしまい、吐出ムラを起こす問題等を生じさせる場合もある。
したがって、切り欠きにより形成される空間を通して、第二ガス吹き付け部15からのガスを、ダイプレート13の外周に吹き付けることで、ダイプレート13の冷却を抑えることができ、ストランド切れの場合にも特に上述のような問題を生じない。 In the present embodiment, a cutout portion is formed on the discharge surface A, and the cutout portion is formed below the position of the
Further, the second
Therefore, cooling of the
ダイプレート1:図2に記載のダイプレートであり、PQ間の距離は2mmである。また、吐出孔の開口部分は直径3mmの円形である。
ダイプレート2:切り欠き部131を有さない以外はダイプレート1と同様のダイプレート(切り欠き部を有さないため、ダイプレート1のPQ間の距離に相当する部分の距離は5mm以上であり、具体的には50mmである。)
押出機:二軸押出機(日本製鋼所製 TEX65)に、第一ガス吹き付け部、第二ガス吹き付け部を図1、3、4に示すように配置した。
第一ガス吹き付け部のガス吹き出し口からストランド状物までの最短距離は5cmである。 <Equipment etc.>
Die plate 1: The die plate shown in FIG. 2, and the distance between the PQs is 2 mm. Moreover, the opening part of a discharge hole is circular with a diameter of 3 mm.
Die plate 2: A die plate similar to the
Extruder: A first gas spraying part and a second gas spraying part were arranged in a twin screw extruder (Tex65 manufactured by Nippon Steel Works) as shown in FIGS.
The shortest distance from the gas outlet of the first gas spraying part to the strand-like object is 5 cm.
上記押出機にダイプレート2を取り付け、先ず、原料ホッパーにポリフェニレンサルファイド樹脂(粘度275Pa・s、融点290℃)59.4質量部に対して、アミノシラン0.4質量部、ステアリン酸エステル0.2質量部を配合した混合物を供給した。次いで、ガラス繊維をサイドフィーダーから40質量部供給して、ガラス繊維によって強化されたポリフェニレンサルファイド樹脂組成物を押出成形した。押出成形の成形条件は、押出量200kg/時間、スクリュー回転数270rpmの押出量で押出成形し、厚み3mmの樹脂ペレットを製造した。樹脂ペレット5kgあたり、着色しているペレットの数を計測した。 <Comparative Example 1>
The
ダイプレート1をダイプレート2に変更した以外は、比較例1と同様の方法で着色しているペレットの数を計測した。実験番号が241~350までは上記の実施例1の条件で押出成形を行なった。計測結果を図5に示した。 <Example 1>
The number of colored pellets was measured in the same manner as in Comparative Example 1 except that the
第二ガス吹き付け部から、上記ストランド状物と上記開口の下端との境界点に当たるように、ガスを吹き付けた以外は実施例1と同様の方法で着色しているペレットの数を計測した。 <Example 2>
The number of pellets colored in the same manner as in Example 1 was measured except that gas was blown so as to hit the boundary point between the strand-like material and the lower end of the opening from the second gas blowing portion.
10 ホッパー
11 シリンダー
12 スクリュー
13 ダイプレート
130 吐出孔
131 切り欠き部
14 第一ガス吹き付け部
15 第二ガス吹き付け部
2 熱可塑性樹脂組成物
DESCRIPTION OF
Claims (9)
- 押出機を用いて熱可塑性樹脂組成物ペレットを製造する方法であって、
前記押出機に設けられたダイプレートの吐出孔から、溶融状態の熱可塑性樹脂組成物をストランド状に押し出す際に、押し出されたストランド状物と前記吐出孔の吐出面側の開口の上部との境界線上の少なくとも一部にガスを吹き付け、
前記ダイプレートの吐出面における、前記吐出孔の開口の下端から前記ダイプレートの外周までの最短距離が2mm以上5mm以下であることを特徴とする熱可塑性樹脂組成物ペレットの製造方法。 A method for producing a thermoplastic resin composition pellet using an extruder,
When extruding the molten thermoplastic resin composition into a strand form from the discharge hole of the die plate provided in the extruder, the extruded strand-like material and the upper part of the opening on the discharge surface side of the discharge hole Spraying gas on at least part of the boundary,
The method for producing a thermoplastic resin composition pellet, wherein the shortest distance from the lower end of the opening of the discharge hole to the outer periphery of the die plate is 2 mm or more and 5 mm or less on the discharge surface of the die plate. - 前記境界線上の少なくとも一部は、前記開口の上端と前記ストランド状物との境界点を含む一部であり、
さらに、前記開口の下端と前記ストランド状物との境界点を含む一部にもガスを吹き付ける請求項1に記載の熱可塑性樹脂組成物ペレットの製造方法。 At least a part on the boundary line is a part including a boundary point between the upper end of the opening and the strand-like object,
Furthermore, the manufacturing method of the thermoplastic resin composition pellet of Claim 1 which sprays gas also to one part including the boundary point of the lower end of the said opening, and the said strand-like thing. - 前記ダイプレートの前記吐出面には切り欠き部が形成され、
前記切り欠き部は、前記吐出面における前記開口の位置よりも下側に形成され、
前記開口の下端と前記ストランド状物との境界点を含む一部に吹き付けるガスは、前記切り欠き部の形成により切り欠かれた空間を通る請求項2に記載の熱可塑性樹脂組成物ペレットの製造方法。 A notch is formed on the discharge surface of the die plate,
The notch is formed below the position of the opening on the ejection surface,
The thermoplastic resin composition pellets according to claim 2, wherein the gas blown to a part including a boundary point between the lower end of the opening and the strand-like material passes through the space cut out by the formation of the cutout portion. Method. - 溶融状態の熱可塑性樹脂組成物をストランド状に吐出する吐出孔を有するダイプレートと、
吐出されたストランド状物にガスを吹き付ける第一ガス吹き付け部と、を備える押出機であって、
前記ダイプレートの吐出面における、前記吐出孔の開口の下端から前記ダイプレートの外周までの最短距離が2mm以上5mm以下であり、
前記ガス吹き付け部は、溶融状態の熱可塑性樹脂組成物をストランド状に押し出す際に、押し出されたストランド状物と前記吐出孔の吐出面側の開口上部との境界線上の少なくとも一部にガスを吹き付ける押出機。 A die plate having discharge holes for discharging a molten thermoplastic resin composition in a strand;
A first gas spraying unit that sprays gas onto the discharged strands, and an extruder,
In the discharge surface of the die plate, the shortest distance from the lower end of the opening of the discharge hole to the outer periphery of the die plate is 2 mm or more and 5 mm or less,
The gas spraying unit, when extruding the molten thermoplastic resin composition in a strand shape, gas is applied to at least a part of the boundary line between the extruded strand material and the upper opening on the discharge surface side of the discharge hole. Spraying extruder. - 前記境界線上の少なくとも一部は、前記開口の上端と前記ストランド状物との境界点を含む一部である請求項4に記載の押出機。 The extruder according to claim 4, wherein at least a part on the boundary line is a part including a boundary point between an upper end of the opening and the strand-like material.
- 前記吐出面における前記開口の位置よりも下方から、前記開口の下端と前記ストランド状物との境界点を含む一部に向けて、ガスを吹き付ける第二ガス吹き付け部をさらに備える請求項4又は5に記載の押出機。 The second gas spraying part which sprays gas toward the part including the boundary point of the lower end of the said opening and the said strand-like object from the downward direction rather than the position of the said opening in the said discharge surface is further provided. The extruder as described in.
- 前記吐出面には切り欠き部が形成され、
前記切り欠き部は、前記吐出面における前記開口の位置よりも下側に形成され、
前記第二ガス吹き付け部から吹き付けられるガスは、前記切り欠き部の形成により切り欠かれた空間を通る請求項6に記載の押出機。 A notch is formed on the discharge surface,
The notch is formed below the position of the opening on the ejection surface,
The extruder according to claim 6, wherein the gas blown from the second gas blowing portion passes through the space cut out by the formation of the cutout portion. - 溶融状態の熱可塑性樹脂組成物を、ストランド状に吐出する吐出孔を有するダイプレートであって、
前記ダイプレートの吐出面における、前記吐出孔の開口の下端から前記ダイプレートの外周までの最短距離が2mm以上5mm以下であるダイプレート。 A die plate having discharge holes for discharging a molten thermoplastic resin composition into a strand shape,
The die plate whose shortest distance from the lower end of the opening of the said discharge hole to the outer periphery of the said die plate in the discharge surface of the said die plate is 2 mm or more and 5 mm or less. - 前記吐出面には切り欠き部が形成され、
前記切り欠き部は、前記吐出面における前記開口の位置よりも下側に形成された請求項8に記載のダイプレート。
A notch is formed on the discharge surface,
The die plate according to claim 8, wherein the notch is formed below a position of the opening on the discharge surface.
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MYPI2013003271A MY161684A (en) | 2011-03-31 | 2011-03-31 | Method for producing thermoplastic resin composition pellet extruder, and die plate |
CN201180067335.XA CN103354776B (en) | 2011-03-31 | 2011-03-31 | The manufacture method of thermoplastic resin composition's particle, extruder and mould |
JP2013506988A JP5728077B2 (en) | 2011-03-31 | 2011-03-31 | Thermoplastic resin composition pellet manufacturing method, extruder and die plate |
PCT/JP2011/058223 WO2012131980A1 (en) | 2011-03-31 | 2011-03-31 | Method for producing thermoplastic resin composition pellet, extruder, and die plate |
TW101110736A TWI564136B (en) | 2011-03-31 | 2012-03-28 | Thermoplastic resin composition, a method for producing a compress product, an extruder, and a mold plate |
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