JPH02293039A - Extrusion granulator - Google Patents

Abstract

PURPOSE:To perform granulation stable in viscosity by constituting the granulator so that the transferring action of uniform pressure is allowed to always act on the extrusion material which is force-fed to a discharge port from an extruder. CONSTITUTION:The extrusion material which has been made to a fluidized state by an extruder 10 is extruded through a perforated plate 15 fitted to the tip part of the barrel 11 of the extruder 10. This extruded material is kneaded in the interval until a plurality of discharge ports 41 provided to the front part of the perforated plate 15. A strand extruded through a discharge port 21 is cut by a cutter 44 arranged to the discharge port 41. In this ease, a throttle wall 20 having a cross-sectional shape throttled to compress the extrusion material is arranged successively to the perforated plate 15 toward a small diameter throttle hole 22. The members 30, 25 constituting a plurality of derivation paths 35 are arranged between the throttle hole 22 and the discharge port 41. The ends of the derivation paths 35 are faced to the throttle hole 22 and the other ends thereof are communicated with the discharge port 41. Granulation stable in viscosity is performed by this simple constitution.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is applicable to extrusion for producing pellets of synthetic resin molding materials, ceramic molding materials, various composite materials for synthetic resin molding, various additives, colorants, etc. This relates to a granulation device.

(Prior art) For example, an apparatus for producing synthetic resin molding materials has a suitable space between the player plate (perforated metal plate) and the discharge port of the extruder, and the extruder has an appropriate space between the player plate (perforated metal plate) and the discharge port, so that the extruded flow due to the play force is It is designed so that the extruded material in the state is extruded with equal pressure from each gate of the discharge port (Japanese Patent Publication No. 52-22779, etc.)
.

(Technical issue) However, in recent years, there has been a demand for various ceramic molded parts, as well as composite materials, additives, or colorants that can be cross-wired and granulated at high concentrations and high filling rates using synthetic resin as a binder. It has become.

However, when such materials are granulated using the above-mentioned granulation device, pressure is not evenly transmitted to the discharge ports due to the low viscosity, and the extrusion speed at each discharge port becomes uneven, resulting in cutting. Variations in length appeared, creating a problem in which granulation with stable viscosity was difficult.

As a result, the pellets produced vary in apparent specific gravity, and in order to mold them into a mold, it is necessary to obtain stable weighing in advance, so measuring equipment must be attached.

The present invention is intended to solve the above-mentioned problems, and its purpose is to provide an extrusion granulation device that has a simple configuration and can perform granulation with stable viscosity.

(Technical means) The above purpose is to extrude the extruded material made into a fluid state by an extruder through a perforated plate attached to the tip of the barrel of the extruder, and to a plurality of discharge ports provided at the tip of the perforated plate. In an extrusion granulation device, the strands extruded from the discharge port are cut by a cutter located at the discharge port. an aperture wall having a constricted cross-sectional shape for compressing the air; and a plurality of tubes arranged between the center hole and the discharge port, with one end facing the aperture hole and the other end communicating with the discharge port. This can be achieved by providing a member constituting a channel.

(Example) This will be explained below with reference to the drawings.

In the figure, reference numeral 10 denotes a screw extruder, and a screw 12 provided in a barrel 11 feeds the extruded material from a hopper 13 installed at the base end, and the extruded material is heated and melted by a heater 14. Cuprate or perforated plate l5
Push out more. The perforated plate 15 has a large number of perforations 1 uniformly formed on the entire surface in the axial direction as shown in FIG.
6, which increases the back pressure inside the barrel 1l and improves the crosstalk condition.The holding body l attached to the tip of the barrel 11
It is attached to 7.

The aperture wall 20 disposed following the perforation slope 15 opens the entrance to the small diameter aperture hole 22 opened in the center from the starting end 2l with a diameter that covers the outermost perforation 16 distributed across the perforation 15. It is a steeply sloped tapered surface with a terminal end 23.

In the illustrated example, the aperture wall 20 and a surrounding wall 25 (described later) are formed into a cylindrical member 24 as shown in FIGS. It is held at 11.

The surrounding wall 25 has an inverted tapered surface with a starting end 26 at the outlet side of the throttle hole 22 and a terminal end 27 at the large diameter tip.

A heater 28 is also provided outside this portion.

The inverted tapered torpedo 30, whose outer surface 34 fits tightly into the surrounding wall 25, has one sharp end 3l located within or near the throttle hole 22, and a large other end located on the discharge port side, which will be described later. The end 32 (FIGS. 5 and 6), and the illustrated one is formed into an inverted conical shape to match the cylindrical barrel 11 and below. The outer surface of the torpedo 30 has a plurality of concave grooves 33 having a substantially U-shaped cross section extending from one end 31 to the other end 32.
It is formed radially when viewed from l.

The torpedo 30 is assembled by being fitted so that the outer surface 34 is in close contact with the surrounding wall 25, thereby forming a lead-out path 35 surrounded by the surrounding wall 25 and each concave groove 33. are consecutively provided in the same number at the tip of each lead-out path 35. The number or total area of these discharge ports 41 is
6 or the total area by a certain percentage.

A member 40 having a plurality of concentric discharge ports 41 is bolted to the cylindrical member 24 while holding the torpedo 30 in a predetermined position (FIG. 1).

42 indicates the bolt. The torpedo 30 is also fixed to the center of the second discharge port member 40 by another bolt. 43 indicates the bolt hole. The cutter 44 is attached via an arm 46 to a rotating shaft 45 that rotates around the screw shaft. 47 is a similar arm, 48 is a balancer attached to it, and 49 is an air duct for cooling the cutter portion. Note that the cutter portion is also covered by a cover 50, and the strand is discharged from the discharge port 5l at the lower end. A gutter 52 connected to a blower is also attached to this cover 50 to cool the strands. 53
indicates a diffusion plate that makes the air blown out from the duct 52 uniform.

(For Inventory) In the extrusion granulation apparatus of the present invention configured as described above, the extrusion material introduced into the hopper 13 passes through the perforated plate 15 in a fluid state.
When it is pushed out through the perforation 16, it is guided into the narrow space between the center aperture 22 by the aperture wall 20, and the aperture 2
2 to a plurality of lead-out paths 35, respectively, and head toward the discharge port 4l.

Therefore, the extruded material exiting the perforated hole 16 moves from the narrow space formed by the perforated plate 5 and the aperture wall 20, to the small-diameter aperture hole 22 in the center, and then to the discharge port 41, so that the difference in fluid viscosity increases. The extrusion pressure is ejected from the ejection port 41 without changing significantly, and as a result, the extrusion pressure is transmitted equally to the plurality of ejection ports in fractions.

In this way, the extrusion speed of the strands extruded from the discharge port 41 is made constant, so that the cut lengths by the cutter 44 are also uniform, and stable granulation is performed.

Note that the lead-out path 35 consists of a concave groove 33 formed on the outer surface of the torpedo 30 and a surrounding wall 25 that fits into the torpedo 30, and since the torpedo 30 is removable, the concave groove 3
3, the throttle opening 22, etc. can be disassembled and cleaned easily.

(Effects) Therefore, according to the present invention, even pressure transmission action can always be exerted on the extruded material that is force-fed from the extruder to the discharge port, so even when granulating with a low-viscosity extruded material, The effect of producing pellets with stable particle size and no variation in apparent specific gravity is exhibited. Therefore, the pellet raw material obtained by the apparatus of the present invention has excellent weighability and contributes to stable quality of secondary products and high productivity. In particular, according to the present invention, even low-viscosity materials can be granulated at low cost, and the added value can be increased by increasing the concentration of raw materials, which is extremely advantageous in practice.

[Brief explanation of the drawing]

The drawings show one embodiment of the extrusion granulation device according to the present invention, in which Fig. 1 is a longitudinal cross-sectional view of the whole, Fig. 2 is a rear view of a perforated plate, and Fig. 3 is a diagram showing a throttle wall, a throttle hole, and a surrounding area. A front view of a cylindrical member having an integral wall, FIG. 4 is a sectional view, FIG. 5 is a front view of a torpedo, FIG. 6 is a sectional view, and FIG. 7 is a rear view of a member provided with a discharge port. , FIG. 8 is a front view of the cutter section. lO...Extruder, l5...Perforated plate, 20...Aperture wall, 22...Aperture hole, 25...Enclosing wall, 30...
Torpedo, 33...concave groove, 34...outer surface of torpedo, 4l...discharge port, 44...cutter. Patent applicant: OK Kasei Co., Ltd. Agent
Patent Attorney Izawa Awa 1+i 'l'f'J
〉1 Figure 2 Number 1 = Brush 3 Figure 4 Figure 5 Figure 'η Figure 7 Figure 6! Figure 8

Claims (5)

[Claims] (1) The extruded material made into a fluid state by the extruder is extruded through a perforated plate attached to the tip of the barrel of the extruder, kneaded between the perforated plate and a plurality of discharge ports provided at the front end of the perforated plate, and then extruded. In an extrusion granulation device in which the strand extruded from the outlet is cut by a cutter placed at the outlet, the strand is placed following the perforated plate and is squeezed toward the small-diameter throttle hole to compress the extruded material. A throttle wall having a cross-sectional shape, and a member constituting a plurality of outlet paths arranged between the center hole and the discharge port, one end facing the throttle hole and the other end communicating with the discharge port. An extrusion granulation device characterized by: (2) The member constituting the outlet path has one end facing the throttle hole sharply formed, the other end facing the discharge port side is formed large, and has the same number of discharge ports on its outer surface from one end to the other end. , consisting of an inverted tapered torpedo with concave grooves arranged in the same manner, and an inverted tapered surrounding wall into which the outer surface of the torpedo is closely fitted, and the outlet path is connected to the concave groove and the inverted tapered enclosure. The extrusion granulation device according to claim 1, wherein the extrusion granulation device is constituted by a wall. (3) The extrusion granulation apparatus according to claim 2, wherein the surrounding wall is provided integrally with the aperture wall. (4) The extrusion granulation apparatus according to claim 2, wherein the torpedo is removably attached to the surrounding wall. (5) The extrusion granulation device according to claim 1, wherein the number or total area of the discharge ports is set smaller than the number or total area of the perforations of the perforated plate.