JP2014069525A - Die plate for resin granulation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase throughput of pellets using a die plate by providing the die plate with a pair of ring-shaped nozzle hole regions including multiple extrusion nozzle holes and having diameters different from each other.SOLUTION: A die plate for resin granulation comprises a first ring-shaped nozzle hole region 4A formed inside of a plate body 1 and a second ring-shaped nozzle hole region 4 formed outside of the first ring-shaped nozzle hole region 4A, which are independent from each other, and has a configuration capable of producing more pellets compared to the conventional one.

Description

  The present invention relates to a resin granulation die plate, and in particular, by providing a die plate with a plurality of extruded nozzle holes and a pair of annular nozzle hole regions having different diameters from each other, the amount of processing to be pelletized by the die plate It relates to a new improvement to increase.

  Conventionally, as this type of resin granulation die plate that has been used, for example, the configurations of Patent Document 1 and Patent Document 2 can be cited. For the extrusion nozzle hole, only one cutter blade in the radial direction is used for the cutter rotating body, that is, only one row of cutter blades arranged in a ring shape with respect to the disk-shaped cutter rotating body. Yes.

That is, the structure of the resin granulation die plate shown in the above-mentioned Patent Documents 1 and 2 is basically the same as the structure shown in FIGS. Therefore, the configuration of FIGS. 5 and 6 will be described below.
In FIG. 5, what is indicated by reference numeral 1 is a plate main body for constituting the resin granulation die plate 2, and there are a number of extruded nozzle holes at a substantially central position in the radial direction R of the plate main body 1. An annular nozzle hole region 4 in which 3 is formed in an annular shape is provided.

As shown in FIG. 6, the nozzle surface 4a which is the upper surface of the annular nozzle hole region 4 of the resin granulation die plate 2 shown in FIG. 5 is excellent in wear resistance with high hardness such as titanium alloy or tungsten alloy. A hardened layer 5 in which a thin metal is formed by adhesion or the like is provided.
The hardened layer 5 is provided in order to reduce the amount of wear on the surface where a cutter blade 6 (described later) and the nozzle surface 4a of the plate body 1 are in contact. In order to cut well, there is a flow rate range of the molten resin that passes per hole, which is determined according to the required processing amount.

A cutter rotating body 11 of the cutter device 10 is disposed in a state of facing the nozzle surface 4 a of the plate body 1, and the rotating shaft 12 of the cutter rotating body 11 rotates about the axis P as the center of rotation. The body 11 and the cutter blade 6 are configured to rotate.
The rotating shaft 12 is configured not only to rotate but also to be able to be pushed and pulled in the front-rear direction via a push-pull means (not shown), and the strand of molten resin pushed out from the push-out nozzle hole 3 rotates and moves to the nozzle surface 4a. It is comprised so that it may cut | disconnect in water with the cutter blade 6 pressed.

Japanese Patent Laid-Open No. 11-277528 JP 2012-66387 A

Since the conventional resin granulation die plate is configured as described above, the following problems exist.
In other words, when the above-mentioned resin granulation die plate is used, if a larger number of nozzle holes can be secured with a die plate of the same size, it is possible to cope with a larger production volume with a smaller die plate. Not only the cost but also the running cost such as the heating power during operation is great. Therefore, in order to arrange a larger number of holes in the die plate, there are a method of increasing the area of the hardened layer in which the nozzle holes are arranged and a method of increasing the hole arrangement density. The method of increasing the hardened layer area is to increase the hardened layer surface width (hardened layer outer diameter-hardened layer circular inner diameter), and to increase the hardened layer outer diameter and inner diameter while keeping the hardened layer surface width constant (increasing the die size There is a way. In the case of the method of widening the cured layer width, the following problems occur and there is a limit to widen the cured layer width.

(1) Cutting defects due to poor alignment between the edge of the cutter blade and the cutting surface of the die plate, that is, the hardened layer surface, such as whiskered pellets (tail pellets) and chain pellets (ream pellets), resulting in product pellet quality degradation. . Moreover, when it gets worse, a bowl-shaped lump pellet is generated, and the operation may be stopped.
(2) It becomes more difficult to uniformly bond the hardened layer and the die plate base material, and there is an increased risk of problems such as cracking due to insufficient flatness of the bonding surface and peeling of the hardened layer due to poor adhesion.
Further, the method of increasing the outer diameter and the inner diameter of the hardened layer is not preferable because the die plate becomes large, and when the die plate becomes large, the size of the granulating apparatus is affected and the cost is increased.

  The resin granulation die plate according to the present invention is a resin granulation die plate provided on the plate body and having a number of extrusion nozzle holes for extruding molten resin, and is formed on the axis side of the plate body. A first annular nozzle hole region having an extruded nozzle hole, and a second annular nozzle hole region having an inner diameter larger than the outer diameter of the first annular nozzle hole region and having a number of the extruded nozzle holes, and The first and second annular nozzle hole regions are configured such that the outer diameter and the inner diameter are separated from each other and have a predetermined width along the radial direction of the plate body, and the plate body On one surface side, a cutter blade of a cutter device for cutting the molten resin extruded in contact with the nozzle surface of the extrusion nozzle hole is rotatably disposed, The cutter blade includes a first cutter blade corresponding to the first annular nozzle hole region and a second cutter blade corresponding to the second annular nozzle hole region, and the first and second cutter blades include the cutter device. The first cutter blade holding portion having the first cutter blade and the first cutter rotating body are provided on the cutter rotating body provided rotatably on the cutter rotating body. An opening is formed between the second cutter blade holding portion and the second cutter blade holding portion.

Since the resin granulation die plate according to the present invention is configured as described above, the following effects can be obtained.
That is, in a resin granulation die plate provided on a plate body and having a number of extrusion nozzle holes for extruding molten resin, a first annular nozzle formed on the axial center side of the plate body and having a number of extrusion nozzle holes The first and second annular nozzle hole regions, each having a hole region and a second annular nozzle hole region having an inner diameter larger than the outer diameter of the first annular nozzle hole region and having a number of the extruded nozzle holes. The outer diameter and inner diameter are separated from each other and independent, and have a predetermined width along the radial direction of the plate body, so that the same size die plate can maintain cutting performance equivalent to the prior art. However, it is possible to cope with a larger processing amount than before.
Further, on one surface side of the plate main body, a cutter blade of a cutter device for cutting the molten resin extruded in contact with the nozzle surface of the extrusion nozzle hole is rotatably disposed, and the cutter blade is The first cutter blade includes a first cutter blade corresponding to the first annular nozzle hole region and a second cutter blade corresponding to the second annular nozzle hole region, and the first and second cutter blades are rotatable with respect to the cutter device. By being provided in the provided cutter rotating body, the strand from each extrusion hole is cut with high efficiency by each cutter blade corresponding to each ring-shaped nozzle hole region, so that a larger amount of pellets than one surface can be formed on one surface. Can be produced on a die plate.
Further, between the first cutter blade holding portion provided on the cutter rotating body and having the first cutter blade and the second cutter blade holding portion provided on the first cutter rotating body and having the second cutter blade. Since the opening is formed, it is possible to prevent the pellets cut by the inner first cutter blade from being hindered from being blown outward by centrifugal force.

It is a front view which shows the die plate for resin granulation by this invention. It is AA sectional drawing of FIG. It is sectional drawing of the principal part which shows the state which combined the cutter rotary body with the die plate for resin granulation of FIG. It is an enlarged view which shows a part of cutter blade of FIG. It is a front view which shows the conventional die plate for resin granulation. It is sectional drawing which shows the state which combined the cutter rotary body with the die plate for resin granulation of FIG.

  The present invention provides a resin structure in which a die plate is provided with a plurality of extruded nozzle holes and a plurality of annular nozzle hole regions having different diameters, thereby increasing the amount of pelletizing with the die plate as compared with the prior art. An object is to provide a grain die plate.

Hereinafter, preferred embodiments of a resin granulation die plate according to the present invention will be described with reference to the drawings.
Note that the same or equivalent parts as in the conventional example will be described using the same reference numerals.
In FIG. 1, what is indicated by reference numeral 1 is a plate main body for constituting a resin granulation die plate 2, and a plurality of extruded nozzle holes are provided at a substantially central position in the radial direction R of the plate main body 1. A pair of first and second annular nozzle hole regions 4A, 4 in which 3 is formed in an annular shape are disposed.

The first and second annular nozzle hole regions 4A and 4 are disposed independently of each other via a distance D, and the first annular nozzle hole region 4A is formed on the axis P side of the plate body 1. the second annular nozzle orifice area 4 is provided with an inner diameter D ₂ made larger than the outer diameter D ₁ of the first annular nozzle hole area 4A.
Said first, second annular nozzle orifice area 4A, 4 includes: the outer diameter D ₁ and the inner diameter D ₂ via the distance D independently apart from each other, and, in the radial direction R of the plate body 1 It has predetermined widths W ₁ and W ₂ along it.

  2 is an AA cross section of the resin granulation die plate 2 of FIG. 1 described above, and each of the first and second annular nozzle hole regions 4A and 4 is provided on one surface side 1A of the plate body 1. FIG. A nozzle surface 4 a of the extrusion nozzle hole 3 is formed. The nozzle surface 4a is provided with first and second hardened layers 5A and 5 in which a thin metal such as titanium alloy or tungsten alloy having high hardness and excellent wear resistance is formed by adhesion or the like.

  The hardened layers 5A and 5 are formed on the nozzle surfaces 4a of the first and second annular nozzle hole regions 4 and 4A, and a cutter blade 6 (described later) and a nozzle surface 4a of the plate body 1 are in contact with each other. It is provided to reduce the amount of wear on the surface, the number of holes of the extrusion nozzle hole 3 has a flow rate range of the molten resin that passes per hole in order to cut the pellet well in water, It is determined according to the requested processing amount.

  FIG. 3 shows a configuration in which a cutter rotating body 11 of a cutter device 10 is combined with the resin granulation die plate 2, and the cutter device 10 is in a state facing the nozzle surface 4 a of the plate body 1. The cutter rotator 11 is arranged so that the rotating shaft 12 of the cutter rotator 11 rotates about the axis P as the center of rotation, whereby the cutter rotator 11 rotates.

  First and second cutter blades 6A, 6 are provided on the front surface 11a side of the cutter rotating body 11, and the first cutter blade 6A corresponds to the first annular nozzle hole region 4A, and the second The cutter blade 6 is disposed so as to correspond to the second annular nozzle hole region 4.

  The cutter rotator 11 is configured to rotate in one direction when the rotary shaft 12 rotates about the axis P, and the cutter rotator 11 is a first cutter blade holding portion on the axis P side. 20 and a ring-shaped second cutter blade holding portion 21 located on the outer peripheral side of the first cutter blade holding portion 20.

The first and second cutter blade holding portions 20, 21 are integrally connected to each other, and the first cutter blade 6A is fixed to the first cutter blade holding portion 20 via a bolt 22, The two cutter blade 6 is fixed to the second cutter blade holding portion 21 via a bolt 23.
Each of the cutter blades 6A, 6 is fixed so that the longitudinal direction thereof is the radial direction R in FIG. 1, that is, the radial direction R shown in FIG. 4, or the non-radial direction, that is, an inclined state. Is configured to be ideal.

The cutter blade holding portions 20 and 21 are arranged in two rows on the same circle center, and the cutter blade holding portions 20 and 21 between the cutter blade holding portions 20 and 21 holding the cutter blades 6A and 6 are arranged. In order to prevent the pellets cut by the first cutter blade 6A from being blown outward by centrifugal force, an appropriate opening 24 is formed.
Therefore, in the above-described configuration, the molten resin discharged in a strand form from each extruded nozzle hole 3 in each annular nozzle hole region 4A, 4 of the resin granulation die plate 2 is cut by each cutter blade 6A, 6. Then, it is solidified in water (not shown), sent to a centrifugal dehydrator (not shown) and dried.

  The resin granulation die plate according to the present invention can increase the throughput of pelletizing by the die plate and improve the production efficiency of pellets by providing a pair of annular nozzle hole regions having different diameters in the die plate. it can.

DESCRIPTION OF SYMBOLS 1 Plate body 1A One surface side 2 Die plate for resin granulation 3 Extrusion nozzle hole 4a Nozzle surface 4A 1st ring-shaped nozzle hole area 4 2nd ring-shaped nozzle hole area D Distance D ₁ Outer diameter D ₂ Inner diameter W ₁ , W ₂ Width 5A First cured layer 5 Second cured layer 6A First cutter blade 6 Second cutter blade 10 Cutter device 11 Cutter rotating body 11a Front surface 12 Rotating shaft 20 First cutter blade holding portion 21 Second cutter blade holding portion 22, 23 Bolt 24 Aperture P Axis center R Radial direction

Claims (3)

In the resin granulation die plate provided on the plate body (1) and having a number of extrusion nozzle holes (3) for extruding the molten resin,
A first annular nozzle hole region (4A) formed on the axis (P) side of the plate body (1) and having a number of the extruded nozzle holes (3), and outside the first annular nozzle hole region (4A) A second annular nozzle hole region (4) having an inner diameter (D ₂ ) larger than the diameter (D ₁ ) and having a number of the extruded nozzle holes (3), and
In the first and second annular nozzle hole regions (4A, 4), the outer diameter (D ₁ ) and the inner diameter (D ₂ ) are separated from each other and independent, and the radial direction of the plate body (1) A resin granulation die plate having a predetermined width (W ₁ , W ₂ ) along (R).   On one surface side (1A) of the plate body (1), a cutter blade of a cutter device (10) for cutting the molten resin extruded in contact with the nozzle surface (4a) of the extruded nozzle hole (3) And the cutter blade includes a first cutter blade (6A) corresponding to the first annular nozzle hole region (4A) and a second cutter corresponding to the second annular nozzle hole region (4). And the first and second cutter blades (6A, 6) are provided on a cutter rotating body (11) rotatably provided on the cutter device (10). The die plate for resin granulation according to claim 1.   A first cutter blade holding portion (20) provided on the cutter rotating body (11) and having the first cutter blade (6A) and the second cutter blade (6) provided on the first cutter rotating body (11). The resin granulation die plate according to claim 1 or 2, wherein an opening (24) is formed between the second cutter blade holding portion (21) and the second cutter blade holding portion (21).

Images