JP3181498B2 - Method and apparatus for treating purge resin material - Google Patents

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 treating a purge resin material discharged from a kneader to the outside in a screw-type kneader for melting and kneading a resin material.

[0002]

2. Description of the Related Art Generally, in a screw-type kneader for melting and kneading a resin material, when a kneader starts operation, stops operation, temporarily stops a device connected to a tip of the kneader, or continuously operates during a continuous operation. When the type of the material is changed, the high-temperature molten state material that has been melt-kneaded by the kneader is discharged out of the kneader. At the start of operation, the resin material containing dust and the like in the kneader at the first operation start, and the residual resin material in the kneader and the transient melting state until reaching the steady state of melt kneading at the restart of operation after operation stop Resin material is discharged. When the operation is stopped, make sure that the resin material does not remain in the kneading machine, or the cleaning resin material used as needed is discharged.If the equipment connected to the tip of the kneading machine is temporarily stopped, the resin material is used. The operation of the kneading machine for maintaining the melt-kneading state in a steady state is continued, and the resin material not supplied to the equipment connected to the tip is discharged.
When the type of resin material is changed, a mixture of different types of resin materials is discharged, and a resin material in a transient molten state until the changed resin material reaches a steady molten state is discharged. You. Between the tip of the screw-type kneader and the device connected to the tip, in order to discharge the resin material out of the machine, a flow passage communicating the resin material downstream and a flow passage discharging the machine out of the machine are provided. A diverter valve for switching is provided. When the resin material is discharged outside the machine, the diverter valve has a discharge flow path connected to the kneading machine, and a rice cake-like high-temperature molten resin material freshly polished from the discharge port of the discharge flow path normally provided downward, It is continuously discharged by the feeding action of the kneader. An apparatus for treating a resin material discharged from an outlet of a diverter valve, that is, a purge resin material is disclosed in Japanese Utility Model Laid-Open No. 7-5719. In this conventional processing apparatus, a flat cutter is used, and the cutter is configured to reciprocate across the discharge port along the outer surface provided with the discharge port of the diverter valve. In the processing apparatus configured as described above, the purge resin material discharged from the discharge port of the diverter valve is cut into a rod having an appropriate length or a plate having an appropriate thickness by the shearing action of the cutter. The cut purge resin material is cooled and solidified with water or the like, and becomes small pieces that can be easily processed.

[0003]

The conventional apparatus for treating a purge resin material has the following problems because it is configured as described above. That is, when the flat cutter reciprocates along the discharge port, the contact area between the cutter and the purge resin material is large, and a large frictional force or a shear force of the purge resin material acts on the contact surface. The driving force for reciprocating the cutter increases.
Also, the purge resin material adheres to the contact surface,
Further, a larger driving force is required. On the other hand, when the flat cutter is crossed along the discharge port, the discharge port is partially or completely closed. When a gap is generated between them, sharpness deteriorates, and complete cutting is not performed. In addition, a gap is generated between the cutter and the outer surface due to the purge resin material attached to the contact surface between the cutter and the purge resin material, and the sharpness deteriorates.

The present invention has been made to solve the above problems, and does not require a large driving force.
It is an object of the present invention to provide a processing method and a processing apparatus for a purge resin material that can always maintain good sharpness.

[0005]

According to the present invention, there is provided a method for treating a purge resin material, comprising the steps of: forming a discharge port formed in a cover of a diverter valve from a screw kneader for melting and kneading the purge resin material to the outside of the screw kneader; In the method for treating the purge resin material discharged through the ring, a ring-shaped holding device reciprocatingly rotating through a pair of fluid pressure cylinders on the outer periphery of the cover, and an L-shaped tensioning device is attached to the holding device so as to face each other. By using a pair of thin wires provided and a rotating member rotatably provided at an axial position of the cover and guiding a central portion of each of the thin wires, by reciprocating the cover,
A method in which a thin wire is repeatedly traversed through the discharge port to cut the purge resin material into small pieces.The purge resin material of the screw type kneader is supplied from the discharge port of the screw type kneader to the outside of the diverter valve cover. In a processing apparatus for purging resin material discharged through a formed discharge port, a ring-shaped holding device reciprocatingly rotating via a pair of fluid pressure cylinders on an outer periphery of the cover, and an L-shaped holding device.
A pair of fine wires stretched opposite to each other in a U-shape, and a rotating member rotatably provided at the axial position of the cover and guiding a central portion of each of the fine wires, and the reciprocating rotation of the cover Accordingly, the cover, the rotating member, and the fine wires reciprocate and rotate, and the purge resin material is cut into small pieces by the fine wires.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a method and an apparatus for processing a purge resin material according to the present invention will be described below with reference to the drawings. FIG. 1 is a front sectional view showing a main part of a screw-type kneader provided with a purging resin material processing apparatus according to the present invention, and FIG. 2 is a view in the direction of arrow II in FIG. In the figure, reference numeral 1 denotes a screw-type kneader, and the tip of the screw-type kneader 1 in which a screw 3 is inserted into an inner hole 2a of a cylinder 2 so as to be rotatable in the direction of arrow A is shown. . At the tip of the screw-type kneader 1, a diverter valve 4 is connected to the flange 2b of the cylinder 2. The diverter valve 4 includes a valve case 5, a piston 6 inserted into the inner hole 5 a of the valve case 5 so as to be able to reciprocate in the direction of arrow B, and a cover provided at an opening at one end of the inner hole 5 a of the valve case 5. 7. The valve case 5 has a through-flow passage 5b penetrating therethrough in communication with the inner hole 2a of the cylinder 2, and the inner hole 5 formed to penetrate vertically.
a. The piston 6 is provided with resin flow paths at two upper and lower positions in the vertical reciprocating direction, the upper flow path 6a communicates with the through flow path 5b of the valve case 5, and the lower flow path 6b is formed of the through flow path 5b. Piston 6 at the inlet
The lower end face 6c, that is, the inner hole 5a of the valve case 5.
It is formed so that it may communicate with. The cover 7
A plurality of outlets 7a penetrating in the thickness direction are formed, and are connected so as to cover the lower opening of the inner hole 5a. The screw type kneader 1 of the diverter valve 4
A downstream device 8 connected to a molding device or the like is connected to and communicates with the through flow path 5b. The diverter valve 4 is provided with a piston 6 by a driving device (not shown).
Is reciprocated in the direction of arrow B, thereby pushing down to make the upper flow path 6a communicate with the through flow path 5b, to connect the screw-type kneader 1 with the downstream equipment 8, and to lift it upward ( The state shown in FIG. 1) The lower flow path 6b and the through flow path 5b
And the screw-type kneader 1 and the outlet 7a of the cover 7 are communicated with each other.

The cover 7 has a discharge port 7 equally divided into four places around the center of a circular discharge surface 7b.
a are provided at equal intervals in the circumferential direction. In the present embodiment, the division of the outlet 7a is not limited to four, but may be any even number. The discharge surface 7
A hole 7c is provided at the axial center position of b, and a rotating member 11 rotatable around an axis in the thickness direction is inserted into the hole 7c via a bearing 11a with a tip protruding from the discharge surface 7b. ing. Two arc-shaped guide grooves 11b are provided on the protruding end surface of the rotating member 11 so as to face each other, and the directions at both ends of each guide groove 11b are perpendicular to each other. A ring-shaped holding device 12 is rotatably provided on an outer periphery formed concentrically with the discharge surface 7b of the cover 7 via a bearing 12A. The lower flat surface 12a of the holding device 12 is
Are arranged at substantially the same height as the discharge surface 7b. The lower flat surface 12a is provided with a first holding member 12b at an opposing position on one center line, and a guide member 12c at an opposing position on a center line orthogonal to the center line of the first holding member 12b. Further, a second holding member 12d is provided at an opposing position on an arbitrary center line. The holding device 12 has one end held by a first holding member 12b, guided by a guide groove 11b of the rotating member 11, guided by a guide member 12c, and held by a second holding member 12d. 13 are stretched. A tension spring 14 is provided on the thin wire 13 between the guide member 12c and the second holding member 12d to maintain the thin wire 13 in a tensioned state. The fine wire 13 is preferably a piano wire having a wire diameter of 0.3 to 1.0 mm. When the wire diameter is smaller than 0.3 mm, the strength is insufficient, and when the wire diameter is larger than 1.0 mm, the cutting resistance increases, the sharpness deteriorates, and the driving force increases. A third holding member 12f is provided at one location on the outer peripheral surface 12e of the holding device 12. In a set of parallel tangential directions along the outer circumference of the holding device 12, two sets of fluid pressure cylinders 15a and 15b as driving devices for reciprocatingly driving in the tangential direction are provided on a support member 16 provided on the cylinder 2. It is supported by.
The tip of the piston of each of the fluid pressure cylinders 15a and 15b is
Along the outer peripheral surface 12e of the holding device 12,
Third holding member 12 of the holding device 12 positioned on the fifth side
f and a chain 17. Therefore, each of the thin lines 13
Are opposed to each other in an L-shape.

Next, a case in which the purge resin material is processed by the purge resin material processing apparatus configured as described above will be described. As shown in FIG. 1, when the screw-type kneader 1 is operated in a state where the lower flow path 6b of the diverter valve 4 is communicated with the inflow port of the through flow path 5b, the cylinder 3 is transported by the screw 3. The resin material in the molten state discharged from the tip of the inner hole 2a passes through the lower flow path 6b of the piston 6 and from the lower end face 6c to the inner hole 5 of the valve case 5.
a through the discharge port 7a of the cover 7 and the discharge surface 7b
Is discharged to the outside from below. On the other hand, in FIG. 2, the holding device 12 is illustrated by first pulling back the piston that has been pushed out of one hydraulic cylinder 15a and simultaneously pushing out the piston that has been pulled back of the other hydraulic cylinder 15b. 2. Rotate counterclockwise from the state of 2 by 90 degrees. Due to the rotation of the holding device 12, two positions of each thin line 13 located between the adjacent discharge ports 7a, that is, the first holding member 12b
Between rotating member 11 and rotating member 11 and guiding member 1
2c cross the outlet 7a along the discharge surface 7b, respectively. Next, two sets of hydraulic cylinders 15
When the holding device 12 is rotated 90 degrees clockwise and returned to the original position, the thin lines 13 also cross the discharge port 7a in the opposite direction to the previous position, and the original position is changed. Return to By repeating the above operations of the fluid pressure cylinders 15a and 15b, the thin wire 13 stretched in the tensioned state repeatedly reciprocates and crosses the discharge port 7a along the discharge surface 7b. The purge resin material discharged through the discharge port 7a is repeatedly cut by the traversing thin lines 13, and falls down as small pieces. In other words, the thin wire 13 stretched in a tensioned state crosses the cutting resin material which is filled in the cross-sectional shape of the discharge port 7a and is discharged in the form of a bar, while easily biting and cutting. When the portion cut by passing the fine wire 13 hangs down by its own weight, the cut is naturally opened and separated, and when the thin wire 13 completes the crossing of the discharge port 7a, it is completely cut and falls downward. During this time, the tension of the thin wire 13 due to the resistance at the time of heating or cutting by the purge resin material is adjusted to a predetermined value by the tension spring 14.

[0009]

The method and apparatus for processing a purge resin material according to the present invention are configured as described above.
The following effects can be obtained. (1) A pair of fine wires arranged opposite to each other in an L-shape are reciprocated by a pair of fluid pressure cylinders, and the purge resin material is cut using the fine wires, so that a contact area between the fine wires and the purge resin material is obtained. And the driving force for cutting is small because the frictional force generated during this time is very small. (2) Since the surface area of the fine wire is small, the amount of the purge resin material adhering to the fine wire is small, and the thin wire is easily heated to reach the same temperature as the purge resin material, so that the adhered purge resin material does not solidify. The amount of adhesion does not increase. Therefore, the frictional force between the thin wire and the purge resin material or the shearing force of the purge resin material is always a very small value without increasing, and the driving force for cutting has a small constant value without change. (3) The thin wire has a small contact area with the purge resin material,
By being stretched in a tension state, there is no influence of the pressure of the purge resin material which is continuously discharged, and the amount of the purge resin material attached to the thin wire does not increase. Therefore, the sharpness of the thin wire cutting the purge resin material does not deteriorate, and good cutting is always performed.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a configuration of a processing apparatus for a purge resin material according to the present invention.

FIG. 2 is a view as viewed in the direction of the arrow II in FIG. 1 (front view).

[Explanation of symbols]

Reference Signs List 4 Divertor valve 5 Valve case 7 Cover 7a Discharge port 11 Rotating member 12, 21 Holding device 13 Fine wire 14 Tension spring (spring) 15a, 15b, 15c Fluid pressure cylinder (drive device) 17 Chain

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Minoru Yoshida 1-6-1, Funakoshiminami, Aki-ku, Hiroshima-shi, Hiroshima Japan Steel Works Co., Ltd. (56) References JP-A-5-228892 (JP, A) Kaihei 7-5719 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B29C 47/00-47/96 B29B 9/06

Claims (2)

(57) [Claims] 1. A screw type kneader for melting and kneading a purge resin material is discharged to the outside of the screw type kneader via an outlet (7a) formed in a cover (7) of a diverter valve (4). In the method for treating a purge resin material, a ring-shaped holding device (12) reciprocatingly rotating through a pair of fluid pressure cylinders (15a, 15b) on the outer periphery of the cover (7), and the holding device (12)
A pair of thin wires (13) stretched opposite each other in an L shape
And a rotating member (11) rotatably provided at an axial center position of the cover (7) and guiding a central portion of each of the thin wires (13), by reciprocating the cover (7). The thin wire (13) repeatedly traverses the discharge port (7a) to cut the purge resin material into small pieces. 2. The purging resin material of the screw-type kneader is discharged to the outside from the discharge port (7a) of the screw-type kneader via a discharge port (7a) formed in a cover (7) of the diverter valve (4). In the processing apparatus for purging the purge resin material, the pair of fluid pressure cylinders (15a, 15a,
A ring-shaped holding device (12) reciprocatingly rotating through 15b), a pair of thin wires (13) stretched opposite to each other in an L shape on the holding device (12), and the cover (7) A rotatable member (1) rotatably provided at the axial center position and guiding the center of each of the thin wires (13).
The cover (7), the rotating member (11), and each of the fine wires (13) are reciprocated by the reciprocating rotation of the cover (7), and the purge resin material is turned into each of the fine wires. (13) An apparatus for treating a purge resin material, wherein the apparatus is configured to be cut into small pieces.