JP2014008653A - Breaker plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a breaker plate which prevents a foamed molded product from having a striped pattern formed thereon.SOLUTION: The breaker plate is provided with a plurality of plates which are stacked. The plurality of plates have a plurality of through holes H1 and H2 that penetrate from a surface to a back face. The through holes H1 and H2 in each of the plurality of plates are continuous. Centers of through holes H1O and H2O which are positioned at an outermost circumference, out of the through holes H1 and H2 in each of the plurality of plates deviates from each other.

Description

  The present invention relates to a breaker plate.

  2. Description of the Related Art Conventionally, a breaker plate for filtering molten resin has been used when producing a foamed molded article by extrusion molding (for example, Japanese Patent Application Laid-Open No. 2004-195889 (Patent Document 1)).

  As shown in FIG. 2, the breaker plate disclosed in Patent Document 1 has a disk shape in which a large number of holes (for example, holes of 1 to 5 mmφ) are formed concentrically.

JP 2004-195889 A

  However, when the inventor manufactures a foam molded article using the breaker plate disclosed in Patent Document 1, a stripe pattern is formed on the foam molded article due to the breaker plate disclosed in Patent Document 1. Have found that problems may occur.

  This invention makes it a subject to provide the breaker plate which can suppress the stripe pattern formed in a foaming molding in view of the said problem.

  The inventor has the problem that the foamed molded product can have a striped pattern after manufacturing a foamed molded product using a low-magnification resin having a relatively low foaming ratio and then using a high-magnification resin having a relatively high foaming ratio. It was found to occur in the foamed molded product produced by the above method. Further, the present inventor has found that the stripe pattern formed on the molded body has a low magnification resin adhered between the holes on the outlet side of the resin, and the high magnification resin is subsequently adhered. It has been found that the magnification resin is peeled off and is extruded together with the high magnification resin. For this reason, as a result of earnestly researching the breaker plate that suppresses the foamed molded body in which the striped pattern is formed by facilitating the peeling of the resin adhered between the holes on the outlet side, the present inventor obtained the present invention. Was completed.

  The breaker plate of the present invention includes a plurality of stacked plates, the plurality of plates having a plurality of through holes penetrating from the front surface to the back surface, and the through holes of the plurality of plates being connected. And the center of the through-hole located in the outermost periphery among each through-hole of this some plate has shifted | deviated.

  According to the breaker plate of the present invention, the center of the outermost continuous through hole where the flow rate of the molten resin is the slowest is shifted, so that the flow field of the molten resin is disturbed in the connection region of the continuous through hole. If the flow field of the molten resin is disturbed, the flow direction of the molten resin is not constant at the outlet portion of the breaker plate, so the foam molded body is manufactured using the high magnification resin after the foam molded body is manufactured using the low magnification resin. When manufactured, the resin adhering between the adjacent through holes on the outermost periphery at the outlet is easily peeled off. When the adhering resin is peeled off, the formation of a striped pattern on the foamed molded product produced thereafter is suppressed. Therefore, after producing a foamed molded product using a low-magnification resin and then producing a foamed molded product using a high-magnification resin, a foamed molded product in which a striped pattern is formed only in the initial stage and the striped pattern is suppressed at an early stage. Can be manufactured. Therefore, the striped pattern formed in the foamed molded product can be suppressed.

  In the breaker plate of the present invention, preferably, the centers of all the through holes located on the outermost periphery among the through holes of each of the plurality of plates are shifted.

  Since the center of all the through holes in the outermost periphery where the flow rate of the molten resin is the slowest is shifted, the flow field of the molten resin flows more disturbed. Thereby, the resin adhering between the adjacent through-holes on the outermost periphery that is most difficult to peel off becomes easier to peel off. Therefore, the stripe pattern formed in the foamed molded product can be further suppressed.

  In the breaker plate of the present invention, preferably, the centers of the through holes located on the inner peripheral side of the through holes of each of the plurality of plates coincide.

  The flow rate of the molten resin that passes through the outermost through hole is slower than the flow rate of the molten resin that passes through the inner peripheral side through hole. It is possible to suppress variations in how the resin adheres between the through holes on the side. Therefore, the stripe pattern formed in the foamed molded product can be further suppressed.

  As described above, according to the present invention, it is possible to provide a breaker plate capable of suppressing the stripe pattern formed on the foamed molded product.

It is a side view which shows roughly the breaker plate in embodiment of this invention. It is a top view which shows roughly the breaker plate in embodiment of this invention. It is a top view which shows roughly the three through-holes formed in two plates which comprise the breaker plate in embodiment of this invention. It is a top view which shows roughly one through-hole formed in one plate which comprises the breaker plate in embodiment of this invention. FIG. 5 is a cross-sectional view taken along the line V-V in FIG. 2, showing between outermost through holes formed in one plate constituting the breaker plate in the embodiment of the present invention. FIG. 5 is a cross-sectional view taken along the line V-V in FIG. 2, showing between the outermost through holes formed in one plate constituting the breaker plate in the embodiment of the present invention. FIG. 5 is a cross-sectional view taken along the line V-V in FIG. 2, showing between the outermost through holes formed in one plate constituting the breaker plate in the embodiment of the present invention. FIG. 5 is a cross-sectional view taken along the line V-V in FIG. 2, showing between the outermost through holes formed in one plate constituting the breaker plate in the embodiment of the present invention. FIG. 3 is a cross-sectional view taken along the line IX-IX in FIG. 2, showing between the inner peripheral side through holes formed in one plate constituting the breaker plate in the embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following drawings, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated.

  First, a breaker plate 100 according to an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the breaker plate 100 according to the present embodiment includes a first plate 110 and a second plate 120 disposed under the first plate 110. The first and second plates 110 have front surfaces 111 and 121 and back surfaces 112 and 122 opposite to the front surfaces 111 and 121. It arrange | positions so that the back surface 112 of the 1st plate 110 and the surface 121 of the 2nd plate 120 may oppose.

  As shown in FIG. 2, each of the first and second plates 110 and 120 has a disk shape and has a plurality of through holes H1 and H2 penetrating from the front surfaces 111 and 121 toward the back surfaces 112 and 122. doing. The plurality of through holes H1 and H2 are formed concentrically.

  As shown in FIG. 2, the through holes H1 and H2 of each of the first and second plates 110 and 120 are connected, but as shown in FIG. 3, each of the first and second plates 110 and 120 is connected. The centers O1 and O2 of the through holes H1O and H2O located on the outermost periphery of the through holes H1 and H2 are shifted. For this reason, the hatched region R in FIG. 3 is a region through which the molten resin passes.

  When the through holes H1O and H2O located on the outermost periphery among the through holes H1 and H2 of the first and second plates 110 and 120 have the same shape and the same number, as shown in FIG. 3, the second plate 110 is preferably configured such that an intermediate position between adjacent through holes H 2 O is the center O 1 of the through hole H 2 O of the first plate 110. In this case, the opening area is substantially the same as the through holes H1 and H2 on the inner peripheral side.

  As shown in FIG. 2, the centers of the through holes H1 and H2 located on the inner peripheral side of the through holes H1 and H2 of the first and second plates 110 and 120 are the same, and the through holes having the same shape are formed. It is lined up.

  Here, the through holes H1O and H2O located on the outermost periphery are through holes formed at positions closest to the circular outer periphery in plan view. That is, the through holes H1O and H2O located on the outermost periphery are through holes formed at positions closest to the wall surface. The through hole located on the inner peripheral side is a through hole located at least on the innermost periphery, and is preferably a through hole excluding the through holes H1O and H2O located on the outermost periphery.

  As shown in FIG.2 and FIG.4, the front-end | tip part by the side of the surface 111 of the through-holes H1O and H2O located in the outermost periphery among several through-holes H1 and H2 is each toward the surfaces 111 and 121 The opening area is widened. Such a shape is preferably formed in all the through holes H1O and H2O located on the outermost periphery.

  Further, the front end portions of the through holes H1O and H2O located on the outermost periphery of the plurality of through holes H1 and H2 on the back surface 112 and 122 side are configured so that the opening area is widened toward the front surfaces 111 and 121. Also good.

In the first plate 110, the thickness (hereinafter also referred to as “partition wall”) between the through hole H1O located on the outermost periphery and the adjacent through hole in the circumferential direction (see the VV cross section in FIG. 2). Since the thickness of the extruder is usually larger as the cylinder diameter of the extruder in which the breaker plate is used is larger, the striped pattern must be increased unless the opening area is enlarged toward the outlet direction of the molten resin as in the breaker plate of this embodiment. The problem may become more pronounced. The same applies to the second plate 120.
Therefore, the breaker plate of the present embodiment is preferably used for an extruder having a diameter of 90 mm or more, and for an extruder having a diameter of 120 mm or more, in that the effect of the present invention can be made more remarkable. More preferred.
Moreover, it is preferable that the thickness of a partition wall is 1 mm or more, and it is more preferable that it is 1.5 mm or more.
The extruder used for continuous extrusion foaming of a sheet-like foamed molded article (foamed sheet) has a cylinder diameter of at most φ250 mm, usually φ200 mm or less, and a partition wall thickness of at most 5 mm, usually 3 mm or less.

In the breaker plate of the present embodiment, the through holes H1O and H2O are enlarged at the front end portions on the surfaces 111 and 121 side as described above.
In other words, in the breaker plate of the present embodiment, the partition wall is thinned at the tip.
It should be noted that the tip end thickness of the partition wall at the forefront is preferably 0.5 mm or less, and more preferably 0.3 mm or less, because the thinner one can exhibit the effects of the present invention remarkably. .
Also, this partition wall faces the surface of the breaker plate so that the through holes H1O and H2O located on the outermost periphery have a shape that enlarges the opening area with an inclination angle of 20 degrees to 40 degrees with respect to the penetration direction. It is preferable that the thickness is reduced.
Moreover, if the opening area of a through-hole is expanded also in the back surface of a breaker plate, it is preferable to set it as the same structure as the above.
The first plate 110 and the second plate 120 can usually be formed so that the length of the through hole is about 5 mm to 15 mm, and the through holes H1O and H2O located at the outermost periphery are formed at the tip portions. In general, the section in which the opening area is enlarged can be set to half or less in the length direction of the through holes H1O and H2O, and is preferably set to 1/3 or less.
That is, it is preferable to make the cross-sectional area constant in the central part in the length direction of the through holes H1O and H2O.

  The front end portions on the surfaces 111 and 121 side of the through holes H1 and H2 located on the inner peripheral side are configured so that the opening area is constant. Moreover, the front-end | tip part by the side of the back surfaces 112 and 122 of the through-holes H1 and H2 located in an inner peripheral side may be comprised so that opening area may be constant.

  As shown in FIG. 4, the areas (opening areas) of the surfaces 111 and 121 of the through holes H1O and H2O located on the outermost circumferences of the first and second plates 110 and 120 are the through holes H1O, It may be larger than the area (opening area) of the back surfaces 112 and 122 of H 2 O. Such a shape is preferably formed in all the through holes H1O and H2O located on the outermost periphery. In the through holes H1O and H2O having such a shape, the centers of the front surfaces 111 and 121 and the centers of the rear surfaces 112 and 122 coincide with each other (centers O1 and O2 in FIG. 4).

  The areas of the through holes H1O and H2O located at the outermost periphery shown in FIG. 4 preferably increase monotonously from the back surface 112 and 122 toward the front surface 111 and 121, respectively. Here, monotonically increasing means that the area always increases or is the same from the back surface 112, 122 toward the front surface 111, 121, and the area of the front surface 111, 121 is larger than the area of the back surface 112, 122.

  As shown in FIG. 2, the area of the front surface 111, 121 of the through hole located on the inner peripheral side of the through holes H 1, H 2 of each of the first and second plates 110, 120 is the back surface 112 of the through hole. , 122, and is preferably always the same area from the front surface 111, 121 to the back surface 112, 122.

  As shown in FIGS. 5 to 8, the space between the through holes H <b> 1 </ b> O and H <b> 2 </ b> O located at the outermost periphery shown in FIG. 4 has a tapered shape from the back surfaces 112 and 122 toward the front surfaces 111 and 121. Specifically, between the adjacent through holes H1O and H2O located on the outermost periphery of each of the first and second plates 110 and 120 shown in FIG. The front surfaces 111 and 121 (tips) may have a width that always decreases toward the center in the extending direction, and the back surfaces 112 and 122 have the same width as shown in FIG. The front surface 111, 121 side (tip portion) may have a width that always decreases toward one end in the extending direction, and as shown in FIG. As shown in FIG. 8, it has a tapered shape toward the front surfaces 111 and 121 and a tapered shape toward the back surfaces 112 and 122, as shown in FIG. You may do it. When the shape between the through holes H1O and H2O located at the outermost periphery is shown in FIG. 8, the front ends of the front surfaces 111 and 121 and the rear surfaces 112 and 122 of the through holes H1O and H2O are the front surfaces 111 and 121 and the rear surface. The opening area is widened toward 112 and 122.

  It is preferable that the space between the through holes H1O and H2O located on the inner peripheral side has a shape having a certain width from the back surface 112 or 122 toward the front surface 111 or 121 as shown in FIG.

  5 to 9, the upper side shows the front surface 111, 121 side, and the lower side shows the back surface 112, 122 side.

  Here, in the present embodiment, the breaker plate 100 in which two plates are laminated is described as an example, but the breaker plate of the present invention may include three or more plates. Moreover, in this Embodiment, the front-end | tip part by the side of the surface 111,121 of the through-holes H1O and H2O located in the outermost periphery among the several through-holes H1 and H2 is surface 111,121 about each of two plates. However, the shape of the through-hole of the breaker plate of the present invention is not particularly limited.

  As described above, the breaker plate 100 according to the present embodiment includes a plurality of stacked plates (first and second plates 110 and 120), and the plurality of plates includes the front surface 111 and 121 to the back surface 112, A plurality of through-holes H1 and H2 penetrating toward 122 are connected, and the through-holes H1 and H2 of each of the plurality of plates are connected to each other. The centers of the through holes H1O and H2O that are positioned are shifted.

  According to breaker plate 100 in the present embodiment, in the plurality of stacked plates (first and second plates 110 and 120), the centers of through holes H1O and H2O connected at the outermost periphery where the flow rate of the molten resin is the slowest are the same. Therefore, the flow field of the molten resin is disturbed in the connection region of the continuous through holes H1O and H2O. If the flow field of the molten resin is disturbed, the flow direction of the molten resin is not constant at the exit portion of the breaker plate 100. Therefore, after the foam molded body is manufactured using the low magnification resin, the foam molded body is manufactured using the high magnification resin. Is produced, the resin adhering between the adjacent through holes H1O on the outermost periphery at the outlet of the breaker plate 100 is easily peeled off. When the adhering resin is peeled off, the formation of a striped pattern on the foamed molded product produced thereafter is suppressed. Therefore, after producing a foamed molded product using a low-magnification resin and then producing a foamed molded product using a high-magnification resin, a foamed molded product in which a striped pattern is formed only in the initial stage and the striped pattern is suppressed at an early stage. Can be manufactured. That is, the stripe pattern increases in the initial stage, but the time until the stripe pattern disappears is shortened. Therefore, by using the breaker plate 100 in the present embodiment, it is possible to suppress the stripe pattern formed on the foamed molded product.

  In breaker plate 100 in the present embodiment, preferably, the centers of all through holes H1O and H2O located on the outermost periphery of through holes H1 and H2 of each of the plurality of plates are shifted.

  Since the centers of all the through holes H1O and H2O on the outermost periphery where the flow rate of the molten resin is the slowest are shifted, the flow field of the molten resin flows more disturbed. Thereby, the resin adhering between the adjacent through holes H1O on the outermost periphery that is most difficult to peel off becomes easier to peel off. Therefore, the stripe pattern formed in the foamed molded product can be further suppressed.

  In the breaker plate 100 in the present embodiment, preferably, the centers of the through holes located on the inner peripheral side of the through holes H1 and H2 of the plurality of plates coincide.

  Since the flow rate of the molten resin passing through the outermost through holes H1O and H2O is slower than the flow rate of the molten resin passing through the inner peripheral side through hole, the resin adhering between the outermost through holes H1O at the outlet And the dispersion | variation in the method of peeling with resin adhering between the through-holes of an inner peripheral side can be suppressed. Therefore, the stripe pattern formed in the foamed molded product can be further suppressed.

  In the breaker plate 100 of the present embodiment, the front end portion of the surface 111 of the through holes H1O and H2O located on the outermost periphery of the plurality of through holes H1 and H2 preferably has an opening area extending toward the surface 111. It is configured.

  As a result, when the front surfaces 111 and 121 are used as the molten resin outlet and the back surfaces 112 and 122 are used as the molten resin inlet, the molten resin outlet side in the outermost through holes H1O and H2O having the slowest flow velocity of the molten resin. Since the opening area of the tip portion is wide, the molten resin flows so as to spread. Since the molten resin flows along the extending direction of the through holes H1O and H2O, the opening area of the front end portions of the surfaces 111 and 121 of the through holes H1O and H2O located at the outermost periphery is the same or narrow (the outermost periphery). In the case of the shape shown in FIG. 9 between adjacent through holes H1O and H2O), the molten resin does not flow so as to spread as in the present embodiment. For this reason, when a foam molded article is manufactured using a high-magnification resin after manufacturing a foam molded article using a low-magnification resin, between the adjacent through holes H1O on the outermost periphery of the surfaces 111 and 121 on the outlet side of the molten resin The resin adhering to becomes easy to peel off. This effect is particularly remarkable in that the resin adhering between the adjacent through holes H1O on the outermost periphery of the first plate 110 which is the outlet side plate is easily peeled off. When the adhering resin is peeled off, the formation of a striped pattern on the foamed molded product produced thereafter is suppressed. Therefore, after producing a foamed molded product using a low-magnification resin and then producing a foamed molded product using a high-magnification resin, a foamed molded product in which a striped pattern is formed only in the initial stage and the striped pattern is suppressed at an early stage. Can be manufactured. Therefore, the striped pattern formed in the foamed molded product can be suppressed.

  In the breaker plate 100 of the present embodiment, preferably, the tips of the surfaces 111, 121 of all the through holes H1O, H2O located on the outermost periphery of the plurality of through holes H1, H2 are directed toward the surfaces 111, 121. The opening area is widened.

  When the front surfaces 111 and 121 are used as the molten resin outlet and the rear surfaces 112 and 122 are used as the molten resin inlet, the outermost through holes H1O and H2O having the slowest flow velocity of the molten resin are on the molten resin outlet side. Since the opening area of a certain tip is widened, the molten resin flows so as to spread more. As a result, the resin adhering between the outermost through holes H1O and H2O that are most difficult to peel off becomes easier to peel off. Therefore, the stripe pattern formed in the foamed molded product can be further suppressed.

  In the breaker plate 100, the front end portions of the surfaces 111 and 121 of the through holes located on the inner peripheral side of the plurality of through holes H1 and H2 are preferably configured to have a constant opening area.

  As a result, the flow rate of the molten resin passing through the outermost through holes H1O and H2O is slower than the flow rate of the molten resin passing through the inner peripheral side through holes, so that the molten resin adheres between the outermost through holes H1O and H2O. It is possible to suppress variation in the peeling between the resin that is attached and the resin that is adhered between the through holes on the inner peripheral side. Therefore, the stripe pattern formed in the foamed molded product can be further suppressed.

  In breaker plate 100 in the present embodiment, preferably, the area of surfaces 111 and 121 of through holes H1O and H2O located at the outermost periphery of through holes H1 and H2 is the through hole H1O located at the outermost periphery. , Larger than the area of the back surface 112, 122 of H2O.

  When the front surfaces 111 and 121 are used on the molten resin outlet side and the back surfaces 112 and 122 are used on the molten resin inlet side, the outermost through holes H1O and H2O having the slowest flow velocity of the molten resin Since the area is larger than the area on the inlet side, the molten resin flows so as to spread. For this reason, if a foam molded article is manufactured using a high-magnification resin after producing a foam molded article using a low-magnification resin, the resin adhering between the adjacent through holes H1O and H2O on the outermost periphery is easily peeled off. Become. Therefore, the stripe pattern formed in the foamed molded product can be further suppressed.

  Preferably, in the breaker plate 100 of the present embodiment, the areas of the surfaces 111 and 121 of all the through holes H1O and H2O located at the outermost periphery of the plurality of through holes H1 and H2 are all the areas located at the outermost periphery. It is larger than the area of the back surfaces 112 and 122 of the through holes H1O and H2O.

  When the front surfaces 111 and 122 are used as the molten resin outlet and the back surfaces 112 and 122 are used as the molten resin inlet, the molten resin outlet side of all the through holes H1O and H2O in the outermost periphery where the flow velocity of the molten resin is the slowest Since the area is larger than the area on the inlet side, the molten resin flows more widely. As a result, the resin adhering between the outermost through holes H1O and H2O that are most difficult to peel off becomes easier to peel off. Therefore, the stripe pattern formed in the foamed molded product can be further suppressed.

  In breaker plate 100 of the present embodiment, preferably, the area of front surface 111, 121 of the through hole located on the inner peripheral side of the plurality of through holes H1, H2 is the rear surface 112 of the through hole located on the inner peripheral side. , 122 is the same as the area.

  As a result, the flow rate of the molten resin passing through the outermost through holes H1O and H2O is slower than the flow rate of the molten resin passing through the inner peripheral side through holes, so that the molten resin adheres between the outermost through holes H1O and H2O. It is possible to suppress variation in the peeling between the resin that is attached and the resin that is adhered between the through holes on the inner peripheral side. Therefore, the stripe pattern formed in the foamed molded product can be further suppressed.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above-described embodiment but by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

  100 breaker plate, 110 first plate, 111, 121 surface, 112, 122 back surface, 120 second plate, H1, H1O, H2, H2O through-hole, O1, O2 center, R region.

Claims (3)

With multiple stacked plates,
The plurality of plates have a plurality of through holes penetrating from the front surface to the back surface,
The through holes of each of the plurality of plates are continuous,
The breaker plate in which the center of the through hole located in the outermost periphery among the through holes of each of the plurality of plates is shifted.   The breaker plate according to claim 1, wherein the centers of all through holes located on the outermost periphery among the through holes of each of the plurality of plates are shifted.   The breaker plate according to claim 1 or 2, wherein the centers of the through holes located on the inner peripheral side of the through holes of each of the plurality of plates coincide with each other.

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