JP2006312242A - Breaker plate for extruder and extruder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a breaker plate for an extruder obtaining an extrudate having desired quality/transparency without causing a clogging or stagnation. <P>SOLUTION: The molten plastic A plasticized and melted by the extruder 8 is filtered by a mesh-like screen 2 and allowed to flow in the respective orifice parts 1a, etc. and respective orifice parts 1b, etc. of the breaker plate 1. The respective orifice parts 1b, etc. of the outer peripheral part F of the breaker plate 1 have an orifice size larger than that of the respective orifice parts 1a, etc. of the central part E of the breaker plate 1 and the extrusion amount of the molten plastic A extruded from the respective orifice parts 1b, etc. becomes larger than that of the molten plastic A extruded from the respective orifice parts 1a, etc. The molten plastic A ready to stagnate in the vicinity of the outer peripheral part on the downstream side of the breaker plate 1 is forcibly or positively transferred toward a downstream passage 5b by the molten plastic A extruded from the respective orifice parts 1b, etc. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  This invention is for example when extruding various foreign substances contained in plasticized and extruded foreign matters, carbides, gels, pelletized raw materials, powdered raw materials, kneaded foods, etc. contained in molten plastic. It is related with the breaker plate for extruders used for the operation | work which removes in step, and an extruder.

  Conventionally, as the above-described breaker plate for an extruder, for example, in the vicinity of the end face of each hole provided in the breaker plate, an expanded portion in which the diameter of each hole is gradually increased is provided, and a cross section along a plurality of concentric circumferences is provided. The breaker plate of Patent Document 1 provided with a V-shaped or U-shaped groove, and a part of the through holes drilled below the center of the breaker plate among the many through holes drilled in the breaker plate There is a breaker plate of an extrusion molding apparatus of Patent Document 2 in which the hole diameter of each is smaller than the hole diameter of the remaining passage hole.

  However, when the breaker plates of Patent Documents 1 and 2 are provided between the upstream passage and the downstream passage connected to the extruder as shown in FIG. 1, the end of each passage is the end face of the breaker plate. When the molten plastic flows into the diameter-expanded portion of the passage, the outer periphery of the passage is compared with the flow velocity of the molten plastic flowing in the center of the passage. Since the flow rate of the molten plastic flowing in the vicinity of the portion becomes slow, the molten plastic tends to stay in the vicinity of the outer peripheral portion of the breaker plate. Further, the molten plastic staying in the vicinity of the outer peripheral portion of the breaker plate hinders the flow of the molten plastic supplied from the extruder, resulting in poor molding efficiency. In addition, the molten plastic flowing in the central portion of the passage is easily mixed with the molten plastic staying in the vicinity of the outer peripheral portion of the breaker plate, and a desired quality plastic cannot be obtained.

JP-A-6-315967 JP-A-7-256731

  In view of the above problems, an object of the present invention is to provide a breaker plate for an extruder and an extruder that can obtain an extrudate having a desired quality and transparency without causing clogging or stagnation.

  The breaker plate for an extruder according to the first aspect of the present invention is provided between an upstream side passage and a downstream side passage for transferring an extrudate extruded from the extruder, and the extrudate on the entire surface facing each of the passages. A breaker plate for an extruder provided with a plurality of holes through which the breaker plate is extruded, wherein the holes provided in the breaker plate are more than the holes provided closer to the center of the breaker plate. The holes provided closer to the outer edge of the breaker plate are arranged so as to have a large diameter.

  The extrudate can be composed of, for example, molten plastic, recycled plastic, pellet raw material, powder raw material, kneaded food, and the like. In addition, on the upstream front surface of the breaker plate, one or several metal mesh screens having a mesh and roughness suitable for removing foreign matters mixed in or contained in the extrudate are overlaid. Further, for example, a cylinder or a barrel constituting an extruder is connected to the upstream end portion of the upstream passage, and a molding die, an extrudate storage portion, etc. are connected to the downstream end portion of the downstream passage, for example. Connected.

  According to the present invention, extrudates such as molten plastic that have been plasticized and melted by an extruder are caused to flow from the upstream passage to each hole provided in the breaker plate, and the extrudate extruded from each hole is It flows into the downstream passage. In addition, each hole provided in the breaker plate is such that the hole provided closer to the outer edge of the breaker plate has a larger diameter than the hole provided closer to the center of the breaker plate. Because of the arrangement, there is a large amount of extrudate extruded from each hole near the outer edge, and the extrudate that tends to stay near the outer periphery of the breaker plate is forced toward the downstream passage or It is actively transferred.

  The breaker plate for an extruder according to a second aspect of the invention is combined with the structure according to the first aspect, and the inner peripheral surface of each hole provided in the vicinity of the outer peripheral portion of the breaker plate is formed on the breaker plate. It is characterized in that it is formed in a cross-sectional shape that gradually decreases from the upstream end surface portion toward the downstream end surface portion.

  According to the present invention, the cross-sectional shape (for example, a funnel) such that the inner peripheral surface of each hole provided in the vicinity of the outer peripheral portion gradually or gradually decreases from the upstream side to the downstream side with respect to the extrusion direction of the extrudate. Shape, conical shape, taper shape, etc.), the flow rate of the extrudate is restricted from the upstream large diameter portion to the downstream small diameter portion of each hole, and the pressure applied to the extrudate is high. Become. When the extrudate is extruded from the downstream small diameter side of each hole, the pressure is released and the extrudate is extruded all at once, so the flow rate of the extrudate increases temporarily or momentarily, near the outer periphery of the breaker plate The extrudate to be retained is forcibly or positively transferred toward the downstream passage.

  A breaker plate for an extruder according to a third aspect of the present invention has a hole provided in the vicinity of the outer peripheral portion of the breaker plate in combination with the configuration according to the first or second aspect, and a central portion of the breaker plate. It is characterized by being formed larger in diameter than each hole provided in the vicinity.

  According to this invention, the amount of extrudate extruded from each hole near the outer peripheral portion is larger than the amount of extrudate extruded from each hole near the central portion, and near the outer peripheral portion of the breaker plate. The extrudate to be retained is forcibly or positively transferred toward the downstream passage.

  A breaker plate for an extruder according to a fourth aspect of the invention is combined with the configuration according to the first or second aspect, and each hole provided in the vicinity of the outer peripheral portion of the breaker plate is formed at the center of the breaker plate. They are arranged in a stepwise or gradually increasing order from the outer edge to the outer edge.

  According to this invention, each hole provided in the vicinity of the outer peripheral portion has a larger hole diameter than each hole provided in the vicinity of the central portion, and the closer to the outer edge portion of the breaker plate, the more the holes are pushed out from the respective hole portions in the vicinity of the outer peripheral portion. Since the extrusion amount of the extrudate is gradually or gradually increased, the extrudate that tends to stay in the vicinity of the outer peripheral portion of the breaker plate is forcibly or actively transferred toward the downstream passage.

  A breaker plate for an extruder according to a fifth aspect of the present invention is combined with the structure according to the first or second aspect, and includes each hole provided in a portion from the center to the outer edge of the breaker plate. The breaker plates are arranged in a stepwise or gradually increasing order from the center to the outer edge.

  According to this invention, the amount of extrudate extruded from each hole increases toward the outer edge from the center of the breaker plate, and the extrudate that tends to stay in the vicinity of the outer periphery of the breaker plate has a downstream passage. It is forcibly or positively transferred towards

  The breaker plate for an extruder according to a sixth aspect of the present invention has a different size in each hole provided in the vicinity of the outer peripheral portion of the breaker plate, in addition to the configuration according to any one of the first to fifth aspects. It is characterized by having been formed.

  According to this invention, the transfer force corresponding to the extrusion amount of the extrudate extruded from the large and small holes provided in the vicinity of the outer peripheral portion is applied to the extrudate that tends to stay in the vicinity of the outer peripheral portion of the breaker plate. The extrudate that tends to stay in the vicinity of the outer peripheral portion of the breaker plate is forcibly or positively transferred toward the downstream passage by the change in the transfer force corresponding to the extrusion amount.

  According to a seventh aspect of the present invention, there is provided an extruder according to any one of the first to sixth aspects.

  According to the present invention, when an extrudate such as plastic that has been plasticized and melted by an extruder passes through each hole provided in the breaker plate, the extrudate is pushed out from each hole toward the outer edge from the center of the breaker plate. Therefore, the extrudate is forcedly or positively transferred toward the downstream passage so as to stay in the vicinity of the outer peripheral portion of the breaker plate.

  The extruder of the invention described in claim 8 is combined with the structure described in claim 7 above, and includes an end portion of the upstream passage facing the upstream end face of the breaker plate, a downstream end face of the breaker plate, An end portion of the opposing downstream side passage is formed in a shape gradually widening in a direction facing the end surface of the breaker plate, and is the same as the inner peripheral portion of the downstream side passage set on the end surface of the breaker plate The boundary on the circumference is set as a boundary between each hole near the center provided inside the boundary and each hole near the outer periphery provided outside the boundary. Features.

  According to this invention, the extrudate flowing through the central portion of the upstream passage is caused to flow into each hole provided in the vicinity of the central portion of the breaker plate, and the extrudate divided into a wide portion of the upstream passage is disposed on the outer peripheral portion of the breaker plate. It flows into each hole provided in the vicinity. On the other hand, the extrudate extruded from each hole near the outer periphery flows into a wide portion of the downstream passage, and merges with the extrudate extruded from each hole near the center, causing clogging and retention. Without extrusion, it is extruded uniformly.

  Also, with the boundary set on the end face of the breaker plate as the boundary or reference, each hole near the center is provided inside the inner periphery of the downstream passage, and each hole near the outer periphery is provided on the downstream passage. Since it is provided outside the inner periphery, the range in which the large-diameter holes are arranged can be easily set or specified according to the inner diameter of the downstream passage.

  According to the present invention, each hole provided in the breaker plate gradually or gradually increases from the center toward the outer edge, so that the extrusion amount of the extrudate gradually increases in accordance with the hole diameter of each hole. Therefore, the extrudate that tends to stay in the vicinity of the outer periphery of the breaker plate can be forcibly or actively transferred toward the downstream passage by the extrudate extruded from each hole near the outer periphery. An extrudate having a desired quality and transparency can be stably obtained without causing clogging or stagnation.

  The object of the present invention is to obtain an extrudate of desired quality and transparency without causing clogging or staying, and for each object provided near the outer periphery rather than each hole provided near the center of the breaker plate. This was achieved by increasing or extruding the extrudate extruded from the hole.

An embodiment of the present invention will be described below in detail with reference to the drawings.
The drawings show a first embodiment of an extruder breaker plate and an extruder used for the operation of extruding molten plastic. In FIG. 1, the extruder breaker plate 1 is provided on a slide plate 3. It is fixed to the mounting hole 3a having a stepped shape. In addition, one or several mesh-like screens 2 for filtering molten plastic A plasticized and melted by an extruder 8 described later are stacked on the upstream front surface of the breaker plate 1.

  The slide plate 3 is located between the opposing surfaces of the upstream seal ring 6 fixed to the downstream outer periphery of the upstream bushing 4 and the downstream seal ring 7 fixed to the upstream outer periphery of the downstream bushing 5. The screen 2 mounted on the breaker plate 1 can be replaced if the slide plate 3 is slidable and slides outside the space between the opposed surfaces of the upstream seal ring 6 and the downstream seal ring 7. .

  The upstream bushing 4 has a single-screw or twin-screw extruder 8 connected to the upstream side (right side in the figure) of the bushing body 4a, and the tip of the extrusion screw 9 constituting the extruder 8 is connected to the bushing body 4a. It is inserted into the upstream passage 4b formed in the above. Further, an end portion (left end portion in the figure) of the upstream passage 4b facing the upstream front surface of the breaker plate 1 is gradually increased in diameter toward a direction facing the upstream front surface of the breaker plate 1 The opening-side outer peripheral portion is connected to the inner peripheral portion of the upstream seal ring 6 facing the upstream front surface of the breaker plate 1.

  The downstream bushing 5 connects, for example, a molding die, an extrudate storage portion, and the like to the downstream side (left side in the figure) of the bushing body 5a, and from each hole 1a ... and each hole 1b ... of the breaker plate 1. The molten plastic A to be extruded is caused to flow along the downstream passage 5b formed in the bushing body 5a. Further, the end portion (the right end portion in the figure) of the downstream passage 5b facing the downstream rear surface of the breaker plate 1 has a diameter-expanding shape that gradually widens in a direction facing the downstream rear surface of the breaker plate 1. The opening is opened at a predetermined angle (approximately 90 degrees), and the opening-side outer peripheral portion is connected to the inner peripheral portion of the downstream seal ring 7 facing the downstream rear surface of the breaker plate 1.

  The inner diameter of the downstream passage 5b is set smaller than the inner diameter of the upstream passage 4b. Further, the opening angle of the upstream side passage 4b may be changed to about 50 degrees or less or about 50 degrees or more, and the opening angle of the downstream side passage 5b is changed to about 90 degrees or less or about 90 degrees or more. May be.

  As shown in FIGS. 2 and 3, the breaker plate 1 is formed in a substantially disk shape or a substantially circular shape when viewed from the front, and each hole 1 a through which the molten plastic A filtered by the screen 2 is allowed to be extruded is formed. .. And a plurality of holes 1b... Are formed from the upstream end surface portion to the downstream end surface portion of the breaker plate 1 and are arranged at a predetermined interval with respect to the entire surface of the breaker plate 1.

  Further, a line-shaped boundary B is set on the end surface of the breaker plate 1 on the same circumference as the inner periphery of the downstream passage 5b, and the boundary B is the center from the boundary B. A central part E in which the holes 1a... Are arranged in the area reaching the part C, and an outer peripheral part F in which the holes 1b... Are arranged in the area from the boundary B to the outer edge D are set. Yes.

  Further, in the vicinity of the center portion E inside the boundary portion B set on the end face of the breaker plate 1, the small hole portions 1a having the same hole diameter size and the same cross-sectional shape are arranged on a plurality of concentric circles, respectively. However, in the vicinity of the outer peripheral portion F outside the boundary portion B, the large hole portions 1b having the same hole diameter size and the same cross-sectional shape are arranged on a plurality of concentric circles. That is, with the boundary B set on the end face of the breaker plate 1 as a boundary or reference, each hole 1a... Is provided in the vicinity of the center E that is inside the inner peripheral portion of the downstream passage 5b, and each hole 1b. Are provided in the vicinity of the outer peripheral portion F, which is outside the inner peripheral portion of the downstream side passage 5b, so that the range in which the holes 1b are arranged according to the inner diameter dimension of the downstream side passage 5b is easily set or Can be identified.

  Each hole 1a of the central portion E arranged inside the boundary B is smaller in diameter than each hole 1b of the outer peripheral portion F arranged outside the boundary B, and each hole 1b. Are formed in a cross-sectional shape such that the extrusion amount of the molten plastic A extruded from the respective holes 1a is smaller than the extrusion amount of the molten plastic A extruded from 1.

  On the other hand, each hole 1b of the outer peripheral part F arranged outside the boundary part B has a larger diameter than each hole 1a of the central part E arranged inside the boundary part B, and each hole part 1a. Are formed in a cross-sectional shape such that the extrusion amount of the molten plastic A extruded from each hole 1b is larger than the extrusion amount of the molten plastic A extruded from. Moreover, you may form each hole 1b ... provided in a part of outer peripheral part F in large diameter.

  The screen 2 is formed in such a size and shape that the entire upstream front surface of the breaker plate 1 is covered, and one or several sheets of the screen 2 are stacked on the upstream front surface of the breaker plate 1 depending on the purpose and purpose. In addition, it is a metal mesh having a mesh, roughness, etc. that prevents passage of foreign materials, carbides, gels, etc. contained in the molten plastic A and allows passage of only the molten plastic A from which they have been removed. It is composed.

  The illustrated embodiment is configured as described above, and a method for extruding the molten plastic A with the breaker plate 1 for an extruder will be described below.

  First, as shown in FIG. 1, the molten plastic A plasticized and melted by the extruder 8 is forcibly transferred in the extrusion direction by the rotational force of the extrusion screw 9, and the upstream passage of the upstream bushing 4. 4b is allowed to flow to the downstream passage 5b of the downstream bushing 5, and the foreign material, carbide, gel, etc. contained in the molten plastic A are passed by the mesh-shaped screen 2 superimposed on the upstream front surface of the breaker plate 1. , Let only the molten plastic A from which they have been removed pass, and let the molten plastic A flowing through the central portion of the upstream passage 4b flow into each hole 1a provided in the central portion E of the breaker plate 1, The molten plastic A divided into the wide diameter-expanded portion of the upstream passage 4b flows into each hole 1b provided in the outer peripheral portion F of the breaker plate 1. Make.

  Next, since each hole 1a ... arranged in the center part E of the breaker plate 1 is formed in the same hole diameter dimension and the same cross-sectional shape from the upstream end face part to the downstream end face part of the breaker plate 1, The flow rate, pressure, and flow rate of the molten plastic A are stable.

  On the other hand, when the extrudate A is extruded to the enlarged diameter side formed at the ends of the upstream side passage 4b and the downstream side passage 5b, the flow rate of the extrudate A becomes slow, and the upstream peripheral portion of the breaker plate 1 is near and downstream. Although the extrudate A tends to stay in the vicinity of the side outer peripheral portion, each hole 1b arranged in the outer peripheral portion F has a larger diameter than each hole 1a arranged in the central portion E, and each hole 1a. Since the extrusion amount of the molten plastic A extruded from the respective holes 1b is larger than the extrusion amount of the molten plastic A extruded from the molten plastic A, the molten plastic which tends to stay in the vicinity of the outer peripheral portion of the breaker plate 1 A is forcibly or positively transferred toward the downstream passage 5b by the molten plastic A extruded from each hole 1b of the outer peripheral portion F.

  Further, the molten plastic A extruded from each hole 1b in the outer peripheral portion F is caused to flow into a wide diameter enlarged portion of the downstream passage 5b, and merged with the molten plastic A extruded from each hole 1a in the central portion E. Therefore, the molten plastic A having the desired quality and transparency can be smoothly extruded without causing clogging or stagnation in part or the whole of the breaker plate 1.

  Further, since the molten plastic A does not stay or remain in the vicinity of the outer peripheral portion on the downstream side of the breaker plate 1 and the inflow, outflow, and flow of the molten plastic A are not hindered, the molten plastic A is disposed on the upstream outer peripheral portion of the breaker plate 1. It can be smoothly extruded without being retained in the vicinity and in the vicinity of the outer peripheral portion on the downstream side.

  FIG. 4 shows that each hole 1b... Provided in the entire outer peripheral portion F (or part) of the breaker plate 1 is gradually or gradually reduced from the upstream end surface portion to the downstream end surface portion of the breaker plate 1. The second embodiment formed in such a cross-sectional shape is shown, and each hole 1b... Is gradually or gradually reduced or narrowed from the upstream side to the downstream side with respect to the extrusion direction of the molten plastic A. In such a cross-sectional shape (for example, a funnel shape, a conical shape, a tapered shape, etc.). In addition, the upstream large diameter portion of each hole 1b is formed larger than the hole diameter of each hole 1a, and the downstream small diameter portion of each hole 1b is the same as the hole diameter of each hole 1a. The same hole diameter is formed.

  In other words, the flow rate, pressure, and flow rate of the extruded amount of the molten plastic A extruded from each hole 1a are stable, but the melting proceeds toward the downstream small diameter part from the upstream large diameter part of each hole 1a. Since the flow rate of the plastic A is limited and the pressure applied to the molten plastic A is increased, when the molten plastic A is extruded from the downstream small diameter side of each hole 1a, the pressure is released and is extruded all at once. Therefore, the flow rate of the molten plastic A temporarily or instantaneously increases, and the molten plastic A that tends to stay in the vicinity of the downstream outer peripheral portion of the breaker plate 1 is forcibly or positively transferred toward the downstream side passage 5b. Thus, operations and effects substantially equivalent to those of the above embodiment can be achieved.

  Further, as in the third embodiment shown in FIG. 5, a part of each hole 1b... Is gradually or gradually decreased from the upstream end surface portion to the downstream end surface portion of the breaker plate 1. It may be formed in a simple cross-sectional shape.

  In addition, in the said Example, you may form the downstream small diameter part of each hole 1b ... in a diameter smaller than the hole diameter of each hole 1a ..., or may form it in a large diameter.

  FIG. 6 shows that each hole 1b... Provided in the whole (or part) of the outer peripheral portion F of the breaker plate 1 is gradually or gradually increased from the center C to the outer edge D of the breaker plate 1. In the fourth embodiment, the flow rate, pressure, and flow rate of the extruded amount of the molten plastic A extruded from the holes 1a are stable, but the closer to the outer peripheral portion F of the breaker plate 1, Since the amount of extrusion of the molten plastic A extruded from the holes 1b ... increases stepwise or gradually, the molten plastic A that tends to stay in the vicinity of the downstream outer peripheral portion of the breaker plate 1 is directed toward the downstream passage 5b. Therefore, the molten plastic A having the desired quality and transparency can be smoothly extruded without causing clogging or staying. It can be achieved action and effects of.

  FIG. 7 shows a step-by-step approach to each hole 1 a... Provided in the entire surface (or part) from the center C to the outer edge D of the breaker plate 1 from the center C to the outer edge D of the breaker plate 1. Or the 5th Example arranged in order which becomes gradually large is shown, and each hole part 1a ... of central part E is arranged in order from the central part C toward boundary part B, or the order which becomes large gradually, and an outer peripheral part The holes 1b of F are arranged in a stepwise or gradually increasing manner from the boundary B toward the outer edge D.

  That is, as the distance from the center portion C of the breaker plate 1 toward the outer edge portion D increases, the amount of molten plastic A extruded from each hole 1a... Gradually increases, so that it stays in the vicinity of the outer peripheral portion on the downstream side of the breaker plate 1 The molten plastic A is forced or actively transferred toward the downstream passage 5b, and the molten plastic A having the desired quality and transparency can be smoothly extruded without causing clogging or stagnation. The operations and effects substantially the same as those of the above embodiment can be achieved.

  Moreover, if the hole diameter difference between each hole 1a ... arranged inside the vicinity of the boundary B and each hole 1b arranged outside the boundary B is increased, each hole 1a ... and each hole The flow rate difference of the molten plastic A flowing through the part 1b.

  FIG. 8 shows a sixth embodiment in which the holes 1b... Provided in the outer periphery F of the breaker plate 1 are formed in different sizes or hole diameters, and some of the holes 1b provided in the outer periphery F are shown in FIG. Is formed in a large diameter, so that the transfer force corresponding to the extrusion amount of the molten plastic A extruded from the large and small holes 1b... Is retained in the vicinity of the outer peripheral portion F of the breaker plate 1. The molten plastic A that is about to stay in the vicinity of the outer peripheral portion F of the breaker plate 1 is forcedly or positively transferred toward the downstream passage 5b by a change in transfer force corresponding to the extrusion amount. Thus, it is possible to achieve substantially the same operations and effects as the above-described embodiment.

  The holes 1a provided in the central portion E may be formed in different sizes or hole diameters. In this case, the hole 1a having the maximum diameter provided in the central portion E is the outermost portion F provided in the outer peripheral portion F. The diameter is set smaller than that of the small-diameter hole 1b.

  The inner peripheral surfaces of the holes 1a and the holes 1b described in the fourth to sixth embodiments are stepwise or gradually directed from the upstream end surface portion to the downstream end surface portion of the breaker plate 1. You may form in cross-sectional shape so that it may become small.

In the correspondence between the configuration of the present invention and the above-described embodiment,
The extrudate of the present invention corresponds to the molten plastic A of the example,
The present invention is not limited to the configuration of the above-described embodiment, but can be applied based on the technical idea shown in the claims, and many embodiments can be obtained.

  The breaker plate and the extruder for the extruder of the present invention are also used for removing various foreign matters mixed or contained in, for example, molten plastic for film production, plastic raw materials in pellet form or powdered form, kneaded food, etc. Can be used.

The vertical side view which shows the extrusion molding by the breaker plate for extruders. The longitudinal side view which shows the example which provided the large diameter hole part in the outer peripheral part. The front view which shows the arrangement | sequence state of the hole provided in the center part and the outer peripheral part. The vertical side view which shows the 2nd example which formed the large diameter hole part in the tapered shape. The longitudinal side view which shows the 3rd example which formed some large diameter hole parts in the taper shape. The front view which shows the 4th example which provided the hole part of the outer peripheral part in order of increasing. The front view which shows the 5th example which provided the hole in order of increasing. The front view which shows the 6th example which formed each hole of the outer peripheral part in a different magnitude | size.

Explanation of symbols

A ... Molten plastic B ... Boundary part E ... Center part F ... Outer peripheral part 1 ... Breaker plate 1a, 1b ... Hole 2 ... Screen 3 ... Slide plate 4 ... Upstream side bushing 4b ... Upstream side passage 5 ... Downstream side bushing 5b ... Downstream passage 6 ... Upstream seal ring 7 ... Downstream seal ring 8 ... Extruder 9 ... Extrusion screw

Claims (8)

For an extruder that is provided between an upstream side passage and a downstream side passage for transferring an extrudate extruded from an extruder, and has a large number of holes through which the extrudate is extruded on the entire surface facing each passage. Breaker plate,
The holes provided in the breaker plate are arranged so that the holes provided closer to the outer edge of the breaker plate have a larger diameter than the holes provided closer to the center of the breaker plate. Extruder breaker plate. The inner peripheral surface of each hole provided in the vicinity of the outer peripheral portion of the breaker plate is formed in a cross-sectional shape that gradually or gradually decreases from the upstream end surface portion to the downstream end surface portion of the breaker plate. Item 7. A breaker plate for an extruder according to Item 1. The breaker plate for an extruder according to claim 1 or 2, wherein each hole provided near the outer periphery of the breaker plate has a larger diameter than each hole provided near the center of the breaker plate. The breaker plate for an extruder according to claim 1 or 2, wherein the holes provided in the vicinity of the outer peripheral portion of the breaker plate are arranged stepwise or gradually increasing from the center of the breaker plate toward the outer edge. . Each hole part provided in the part from the center part of the said breaker plate to an outer edge part was arranged in the order which became large gradually or gradually toward the outer edge part from the center part of this breaker plate. Breaker plate for extruder. The breaker plate for an extruder according to any one of claims 1 to 5, wherein each hole provided in the vicinity of the outer periphery of the breaker plate is formed to have a different size. An extruder provided with the breaker plate according to any one of claims 1 to 6. The end of the upstream passage facing the upstream end face of the breaker plate and the end of the downstream passage facing the downstream end face of the breaker plate are gradually moved in a direction facing the end face of the breaker plate. Formed into a wide shape,
A boundary portion on the same circumference as the inner peripheral portion of the downstream passage set on the end face of the breaker plate, each hole portion near the center provided inside the boundary portion, and outside the boundary portion The extruder according to claim 7, wherein the extruder is set as a boundary with each hole near the outer peripheral portion provided in.

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