JP7359652B2 - extrusion mold - Google Patents

Description

The present disclosure relates to an extrusion mold, and more particularly to an extrusion mold for manufacturing a molded plate having a hollow portion.

Molded plates made mainly of materials such as cement and gypsum are used as building materials for the outer walls of buildings and the like. In order to reduce the weight of a molded plate, a plurality of hollow portions are formed in the molded plate. In order to mass-produce molded plates, molded plates are also manufactured by extrusion molding. In the case of extrusion molding, for example, a hollow pin for forming a hollow part is provided in the flow path of the molding material in the extrusion mold.

Incidentally, the molded plate may not only have hollow portions uniformly formed throughout, but may also have portions where the hollow portion is formed and portions where the hollow portion is not formed. For example, a hollow portion may not be formed at the end of the molded plate where the fruit is formed in order to ensure strength. When providing a portion in which no hollow portion is formed, no hollow pin is provided within the flow path of the extrusion mold at a location corresponding to the portion. In areas in the flow path where hollow pins are not provided, the molding material flows easily because there is no resistance due to the hollow pins. This creates areas within the flow path where the molding material flows easily and areas where it does not flow easily, and in areas where it does not flow easily, the amount of molding material is insufficient and defects such as dents, roughness, and sink marks are likely to occur on the surface of the molded plate. Become.

Therefore, in places where hollow pins are not provided, dummy pins that are shorter than the hollow pins are provided to generate resistance (see Patent Document 1).

However, since the dummy pins are shorter than the hollow pins, they apply less resistance to the molding material than the hollow pins, and therefore it has been difficult to suppress defects on the surface of the molded plate using only the dummy pins.

In addition, by partially pushing a member called an adjustment gate or choke into the flow path of the molding material in the extrusion mold, the volume of the flow path can be partially adjusted and the flow of the molding material in the flow path can be adjusted. Ease of use has also been adjusted (see Patent Document 2).

Japanese Patent Application Publication No. 2018-130872 Japanese Patent Application Publication No. 8-270115

However, if a member such as a choke is partially pushed into the flow path, the flow of the molding material within the flow path may be disturbed, which may cause defects on the surface of the molded plate. .

The present invention has been made in view of the above circumstances, and an object thereof is to provide an extrusion mold that is used for manufacturing a molded plate having a hollow portion and is capable of making it difficult to cause defects on the surface of the molded plate. That's true.

An extrusion mold according to one aspect of the present invention is an extrusion mold for manufacturing a molded plate having a plurality of hollow parts by extrusion molding, and includes a flow path through which a molding material flows and an extrusion port communicating with the flow path. , a molding member disposed within the flow path and molding the hollow portion. The molded member includes a support part held in the flow path, a hollow molded part and a dummy molded part supported by an end of the support part on the extrusion port side, and the hollow molded part and the dummy molded part are connected to each other. The dummy molding portions are arranged in one direction along the opening surface of the extrusion port. The hollow molded part includes a plurality of hollow pins that protrude from the support part toward the extrusion port, and a plurality of first adjustment parts, and the hollow pins and the first adjustment parts are arranged along the opening surface. Arrange in alternating directions. The dummy molding part includes a plurality of dummy pins and a plurality of second adjustment parts that protrude from the support part toward the extrusion port, and the dummy pins and the second adjustment parts are arranged in the direction along the opening surface. line up alternately. The dummy pin is shorter than the hollow pin, and when viewed in the direction in which the hollow pin and the dummy pin are lined up, the tip of the second adjustment section on the extrusion port side is longer than the tip of the first adjustment section on the extrusion port side. Also protrudes toward the extrusion port side .

According to the present invention, it is possible to provide an extrusion mold that is used for manufacturing a molded plate having a hollow portion and that makes it difficult to cause defects on the surface of the molded plate.

FIG. 2 is a cross-sectional view showing an example of a molded plate having a hollow portion. It is a typical sectional view of the extrusion molding die in one embodiment of the present invention. It is a schematic perspective view which shows a part of molded member in embodiment same as the above. It is a sectional view of the main part of the extrusion mold in the embodiment same as the above. It is a sectional view of another important part of the extrusion mold in the embodiment same as the above.

An embodiment of the present invention will be described below.

The extrusion mold 1 according to this embodiment is used to manufacture a molded plate 10 having a plurality of hollow parts 101 as shown in FIG. 1 by extrusion molding. This molded plate 10 has a portion in which the hollow portion 101 is not formed. Although the molded plate 10 shown in FIG. 1 has a portion in which the hollow portion 101 is not formed at the end thereof, there may be a portion in which the hollow portion 101 is not formed at any position on the molded plate.

FIG. 2 is a schematic cross-sectional view of the extrusion mold 1 taken along a plane perpendicular to the flow direction of the molding material. As shown in FIG. 2, the extrusion mold 1 includes a channel 2 through which the molding material flows, an extrusion port 3 communicating with the channel 2, and a molding device disposed within the channel 2 to form a hollow portion 101. and a member 4.

FIG. 3 is an overall perspective view of the molded member 4. As shown in FIG. The molding member 4 includes a support portion 41, a plurality of molding pins 42, and an adjustment portion 8, as shown in FIGS. 2 and 3. The support portion 41 is held within the flow path 2 . The plurality of forming pins 42 are supported by the end of the support portion 41 on the extrusion port 3 side, and protrude from the support portion 41 toward the extrusion port 3 . The plurality of forming pins 42 are arranged in a direction along the opening surface 31 of the extrusion port 3. The adjustment section 8 is supported by the end of the support section 41 on the extrusion port 3 side.

As shown in FIG. 3, the molded pin 42 includes a plurality of hollow pins 71 and a plurality of dummy pins 72 shorter than the hollow pins 71.

As shown in FIG. 3, the adjustment section 8 includes a first adjustment section 81 supported by a section of the support section 41 that supports the plurality of hollow pins 71, and a section of the support section 41 that supports the plurality of dummy pins 72. and a second adjustment section 82 supported by the second adjustment section 82 . The hollow pin 71 and the first adjustment part 81 constitute the hollow molded part 43, and the dummy pin 72 and the second adjustment part 82 constitute the dummy molded part 44.

As described above, the molded member 4 includes the support part 41, the hollow molded part 43 and the dummy molded part 44 supported by the end of the support part 41 on the extrusion port 3 side, and the hollow molded part 43 and the dummy molded part 44 are lined up in one direction (X direction, which will be described later) along the opening surface 31 of the extrusion port 3. In this embodiment, dummy molded parts 44 are provided at both ends of the support part 41 in the one direction so as to correspond to the ends of the molded plate 1, while at the midway part of the support part 41 in the one direction, A hollow molded part 43 is provided to correspond to the hollow part 101 of the molded plate 1. Further, the hollow molded part 43 includes a plurality of hollow pins 71 and a plurality of first adjustment parts 81 that protrude from the support part 41 toward the extrusion port 3. They are arranged alternately in the aforementioned direction along. Further, the dummy molding section 44 includes a plurality of dummy pins 72 and a plurality of second adjustment sections 82 that protrude from the support section 41 toward the extrusion port 3, and the dummy pins 72 and the second adjustment sections 82 are arranged along the opening surface 31. They are arranged alternately in the above-mentioned directions.

In this embodiment, the dummy pin 72 is shorter than the hollow pin 71, and the size of the second adjustment part 82 is larger than the size of the first adjustment part 81.

According to the present embodiment, when a molding material is supplied into the flow path 2 of the extrusion mold 1 and extruded from the extrusion port 3 while flowing within the flow path 2, a plurality of hollows formed by the hollow pins 71 are formed. A molded plate 10 having a portion 101 is obtained. During extrusion molding of this molding material, since the dummy pin 72 is shorter than the hollow pin 71, the dummy pin 72 does not form the hollow part 101, and therefore the dummy molded part 44 is a part of the molded plate 10 that does not have the hollow part 101. can be formed. Moreover, even if the dummy pin 72 is shorter than the hollow pin 71 in this way, the size of the second adjustment part 82 is larger than the size of the first adjustment part 81, so the part around the hollow molded part 43 in the flow path 2 This makes it difficult for a difference in width to occur between the dummy molded part 44 and the surrounding parts. Therefore, a difference in the resistance applied to the molding material is unlikely to occur between when the molding material passes around the hollow molded part 43 and when it passes around the dummy molded part 44. Therefore, within the flow path 2, there are areas where the molding material flows easily and areas where it does not flow easily.As a result, the amount of molding material is insufficient in the areas where it does not flow easily, resulting in dents, roughness, and sink marks on the surface of the molding plate 10. Situations such as these will become less likely to occur. Therefore, in this embodiment, the molded plate 10 having the hollow portion 101 can be manufactured using the extrusion mold 1, and the surface properties of the molded plate 10 can be made less likely to deteriorate during manufacture of the molded plate 10.

The configuration of the extrusion mold 1 according to this embodiment will be explained in more detail. As shown in FIG. 2, the extrusion mold 11 includes a mold body 9, a flow path 2, and a molding member 4. The flow path 2 is formed within the mold body 9. A suitable extruder that supplies molding material to the flow path 2 is connected to the flow path 2 . The mold body 9 has an extrusion port 3 that communicates with the flow path 2 .

The molded member 4 is held by a mold body 9 so as to be placed within the flow path 2 . The flow path 2 is branched into a first flow path 21 and a second flow path 22 by the molded member 4 at the end of the molded member 4 opposite to the extrusion port 3, and the first flow path 21 and the second flow path 22 are joined at the end of the molded member 4 on the extrusion port 3 side.

FIG. 3 is a schematic perspective view of a portion of the molded member 4 of this embodiment on the extrusion port 3 side. The molding member 4 includes a support portion 41, a plurality of molding pins 42, and a plurality of adjustment portions 8. The adjustment section 8 includes a first adjustment section 81 and a second adjustment section 82.

The support portion 41 is held within the flow path 2 . This support portion 41 branches the flow path 2 into a first flow path 21 and a second flow path 22 .

The forming pin 42 is supported by the end of the support portion 41 on the extrusion port 3 side, and protrudes from the support portion 41 toward the extrusion port 3 . The plurality of forming pins 42 are lined up in one direction along the opening surface 31 of the extrusion port 3. The plurality of forming pins 42 are arranged at intervals. For example, the forming pins 42 are arranged at equal intervals, but they may be arranged at different intervals.

Hereinafter, for convenience, the direction in which the forming pins 42 are lined up along the opening surface 31 of the extrusion port 3 will be referred to as the X direction, and the direction along the opening surface 31 of the extrusion port 3 and perpendicular to the X direction will be referred to as the Y direction. The direction perpendicular to both the and Y direction is called the Z direction.

The molded pin 42 has a long shape in the Z direction. As described above, the plurality of forming pins 42 are arranged in a line in the X direction. The plurality of molded pins 42 include a plurality of hollow pins 71 and a plurality of dummy pins 72.

In this embodiment, from one end of the molded member 4 in the X direction to the other end, first a plurality of dummy pins 72 are lined up, then a plurality of hollow pins 71 are lined up, and then a plurality of dummy pins 72 are lined up. . The arrangement of the plurality of dummy pins 72 and hollow pins 71 is as shown in FIG. This is an arrangement for manufacturing 10. Note that the position of the hollow pin 71 and the position of the dummy pin 72 are not limited to the above-mentioned arrangement, and can be designed depending on the position of the part having the hollow part 101 and the position of the part not having the hollow part 101 in the molded plate 10. It is fine if it is done.

The hollow pin 71 has a base portion 5 and a pin portion 6. The base portion 5 is a portion of the hollow pin 71 on the support portion 41 side in the Z direction, and the end portion of the base portion 5 on the support portion 41 side in the Z direction is connected to the support portion 41 . Thereby, the hollow pin 71 is supported by the support portion 41. The base portion 5 has a substantially triangular shape when viewed in the X direction, and the Y direction dimension of the base portion 5 becomes smaller toward the extrusion port 3 side in the Z direction. The pin portion 6 has a columnar shape that is long in the Z direction. The pin portion 6 has a shape and dimensions that correspond to the hollow hole 101 formed in the molded plate 10. An end of the pin portion 6 on the support portion 41 side in the Z direction is connected to the base portion 5 . That is, the pin portion 6 protrudes from the end of the base portion 5 on the side of the extrusion port 3 in the Z direction toward the extrusion port 3 along the Z direction. The tip of the pin portion 6 on the extrusion port 3 side is located at the opening surface 31 of the extrusion port 3.

The dummy pin 72 also has a base portion 5 and a pin portion 6. The base portion 5 is a portion of the dummy pin 72 on the support portion 41 side in the Z direction, and the end portion of the base portion 5 on the support portion 41 side in the Z direction is connected to the support portion 41 . Thereby, the dummy pin 72 is supported by the support portion 41. The base portion 5 has a substantially triangular shape when viewed in the X direction, and the Y direction dimension of the base portion 5 becomes smaller toward the extrusion port 3 side in the Z direction. The base 5 of the dummy pin 72 has the same shape and dimensions as the base 5 of the hollow pin 71, but may have a different shape and dimensions. The pin portion 6 has a columnar shape that is long in the Z direction. An end of the pin portion 6 on the support portion 41 side in the Z direction is connected to the base portion 5 . That is, the pin portion 6 protrudes from the end of the base portion 5 on the side of the extrusion port 3 in the Z direction toward the extrusion port 3 along the Z direction. The dimension (length) of the pin portion 6 in the dummy pin 72 in the Z direction is shorter than the dimension (length) in the Z direction of the pin portion 6 in the hollow pin 71 . The tip of the pin portion 6 of the dummy pin 72 on the extrusion port 3 side in the Z direction is located closer to the support portion 41 than the tip of the pin portion 6 of the hollow pin 71 on the extrusion port 3 side in the Z direction. The end of the pin portion 6 of the dummy pin 72 on the extrusion port 3 side in the Z direction is sharp so as to protrude toward the extrusion port 3.

The molded member 4 includes a plurality of first adjustment parts 81, and each first adjustment part 81 is located between adjacent hollow pins 71. That is, the hollow pins 71 and the first adjustment parts 81 are arranged alternately in the X direction. A collection of the plurality of hollow pins 71 and the first adjustment part 81 arranged in one row constitutes the hollow molded part 43. Further, the molded member 4 includes a plurality of second adjustment parts 82, and each second adjustment part 82 is arranged between adjacent dummy pins 72. That is, the dummy pins 72 and the second adjustment parts 82 are arranged alternately in the X direction. A collection of the plurality of dummy pins 72 and the second adjustment section 82 arranged in one row constitutes the dummy molding section 44. Therefore, in this embodiment, the molded member 4 includes two dummy molded parts 44 and one hollow molded part 43, and one hollow molded part 43 is located between the two dummy molded parts 44.

4 shows a cross section of the hollow molded part 43 taken along a YZ plane perpendicular to the X direction, and FIG. 5 shows a cross section of the dummy molded part 44 taken along a YZ plane perpendicular to the X direction. In FIG. 5, the hollow pin 71 and the first adjustment part 81 in the hollow molded part 43 are shown by broken lines. As shown in FIGS. 4 and 5, each of the first adjustment section 81 and the second adjustment section 82 has a dimension in the Y direction that decreases as the position in the Z direction moves toward the extrusion port 3 side when viewed in the X direction. It has a triangular shape. Therefore, when viewed in the X direction, the ends of each of the first adjustment section 81 and the second adjustment section 82 on the extrusion port 3 side form an acute angle toward the extrusion port 3. Further, when viewed in the X direction, the tips of each of the first adjustment section 81 and the second adjustment section 82 on the extrusion port 3 side are arranged inside the contour of the base 5 of the forming pin 42. Furthermore, when viewed in the X direction, each of the first adjustment section 81 and the second adjustment section 82 is entirely disposed inside the contour of the base 5 of the forming pin 42.

In this embodiment, the size of the second adjustment section 82 when viewed in the X direction is larger than the size of the first adjustment section 81 when viewed in the X direction. More specifically, when viewed in the X direction, the second adjustment part 82 has a shape in which the tip on the extrusion port 3 side protrudes further toward the extrusion port 3 side than the tip of the first adjustment part 81 on the extrusion port 3 side. have Therefore, even if the dummy pin 72 is shorter than the hollow pin 71,
A difference in width is unlikely to occur between the area around the hollow molded part 43 and the area around the dummy molded part 44 in the flow path 2 .

As described above, the difference in size between the first adjustment section 81 and the second adjustment section 82 makes it possible to increase the ratio between the average volume of the hollow molding space 23 and the average volume of the dummy molding space 24 in the flow path 2. is preferably within the range of 1.0:1.0 to 1.0:1.08. The closer this ratio is to 1.0:1.0, the more preferable it is, and the more preferably 1.0:1.0. Note that the hollow molding space 23 and the dummy molding space 24 are included in the space 20 from the end of the support portion 41 on the extrusion port 3 side in the flow path 2 to the extrusion port 3. The hollow molding space 23 and the dummy molding space 24 are arranged in the X direction, the hollow molding part 43 is arranged in the hollow molding space 23, and the dummy molding part 44 is arranged in the dummy molding space 24. That is, the hollow molded space 23 is the space around the hollow molded part 43 in the flow path 2, and the dummy molded space 24 is the space around the dummy molded part 44 in the flow path 2.

The ratio between the average volume of the hollow molding space 23 and the average volume of the dummy molding space 24 can be set by adjusting the size of the first adjustment part 81 and the size of the second adjustment part 82 when viewed in the X direction. The average volume of the hollow molding space 23 can be regarded as the value obtained by dividing the volume of the hollow molding space 23 by the dimension of the hollow molding space 23 in the X direction. Further, the average volume of the dummy molding space 24 can be regarded as a value obtained by dividing the volume of the dummy molding space 24 by the dimension of the dummy molding space 24 in the X direction.

Note that the adjustment section 8 between the adjacent hollow pins 71 and dummy pins 72 may be the first adjustment section 81 included in the hollow molded section 43, or the second adjustment section 82 included in the dummy molded section 44. It may be.

In this embodiment, the mold body 9 includes a plurality of chokes 91. The choke 91 is arranged within the mold body 9 and forms part of the inner surface of the flow path 2 . The multiple chokes 91 are lined up in the X direction. The choke 91 can move forward and backward toward the flow path 2 and away from the flow path 2. By moving toward the flow path 2, the choke 91 projects into the flow path 2 and thereby moves inside the flow path 2. Increases the resistance exerted on the flowing molding material. By causing a portion of the plurality of chokes 91 arranged in the X direction to protrude from the inner surface of the flow path 2, the resistance within the flow path 2 can be partially adjusted. In this embodiment, when viewed in the X direction, the choke 91 is provided at one location facing the forming pin 42 in the Y direction; however, the position of the choke 91 is not limited to this, and the choke 91 is provided at multiple locations. It may be.

A method for manufacturing the molded plate 10 using the extrusion mold 11 of this embodiment will be explained.

Prepare molding materials. The molding material contains, for example, a hydraulic inorganic material. The molding material contains, for example, an inorganic main material, an inorganic admixture, an organic admixture, reinforcing fibers, and water.

The inorganic main material contains, for example, a compound containing at least one of silicon and calcium, such as a hydraulic inorganic material such as cement. The inorganic main material may further contain fly ash, silica fume, silica powder, etc.

Inorganic admixtures include, for example, inorganic foams used as lightweight aggregates, and can include, for example, perlite, fly ash balloons, and vermiculite. The inorganic admixture may further contain mica, wollastonite, and the like.

The organic admixture may contain, for example, methyl cellulose, organic expanded particles, and the like. The organic foamed particles can contain foamed particles of, for example, styrene resin, vinylidene chloride resin, and acrylonitrile resin.

The reinforcing fibers can include, for example, natural fibers such as pulp fibers, organic fibers such as polypropylene and vinylon, and inorganic fibers such as glass fibers, rock wool, and carbon fibers.

A molding material is supplied to the extrusion mold 1 using an extruder or the like. The molding material flows within the flow path 2 of the extrusion mold 1 toward the extrusion port 3 .

In the flow path 2, when the molding material reaches the support portion 41 of the molded member 4, the molding material is divided into a first flow path 21 and a second flow path 22 and flows therethrough. The molding materials flowing through the first flow path 21 and the second flow path 22 join together at the end of the support part 41 on the extrusion port 3 side, and flow around the hollow molded part 43 and around the dummy molded part 44. .

Around the hollow molded part 43, the molding materials flowing in each of the first flow path 21 and the second flow path 22 flow along the surface of the first adjustment part 81, so that their merging is promoted. At this time, as described above, since the end of the first adjustment part 81 on the extrusion port 3 side forms an acute angle toward the extrusion port 3 when viewed in the X direction, it is easy to smoothly merge the molding materials. . Furthermore, when viewed in the X direction, the tip of the first adjustment section 81 on the extrusion port 3 side is arranged inside the contour of the hollow pin 72, so the first adjustment section 81 is less likely to obstruct the flow of the molding material. Therefore, the molding material after merging easily flows around the hollow pin 71. Furthermore, since the entire first adjustment section 81 is arranged inside the contour of the hollow pin 72 when viewed in the X direction, the first adjustment section 81 is less likely to impede the flow of the molding material, and therefore the molding material This enables smooth extrusion. Thereby, the molding material flows smoothly around the hollow pin 71, and the hollow part 101 is formed.

Also, around the dummy molding section 44, the molding materials flowing through each of the first flow path 21 and the second flow path 22 flow along the surface of the second adjustment section 82, so that their merging is promoted. At this time, as described above, since the end of the second adjustment part 82 on the extrusion port 3 side forms an acute angle toward the extrusion port 3 when viewed in the X direction, it is easy to smoothly merge the molding materials. . Furthermore, when viewed in the X direction, the tip of the second adjustment part 82 on the extrusion port 3 side is arranged inside the outline of the dummy pin 72, so the second adjustment part 82 does not easily inhibit the flow of the molding material. Therefore, the molding material after merging easily flows around the dummy pins 72. Furthermore, since the entire second adjustment section 82 is arranged inside the contour of the dummy pin 72 when viewed in the X direction, the second adjustment section 82 is less likely to impede the flow of the molding material. Enables smooth extrusion. Thereby, the molding material flows smoothly around the dummy pins 72. Since the length of the dummy pin 72 is shorter than the hollow pin 71, the molding material reaches the tip of the dummy pin 72 within the flow path 2, and therefore the dummy pin 72 is difficult to form the hollow portion 101. When the dummy pins 72 are sharp as in this embodiment, the molding materials tend to merge at the tips of the dummy pins 72, so that even with the dummy pins 72, it is particularly difficult to form the hollow portions 101.

Further, the dummy pin 72 is shorter than the hollow pin 71, and therefore the resistance that the dummy pin 72 gives to the molding material is smaller than that of the hollow pin 71. However, as already explained, in this embodiment, the size of the second adjustment part is smaller than that of the first adjustment part. , the resistance that the molding material flowing around the hollow molded part 43 receives from the entire hollow molded part 43 and the resistance that the molding material that flows around the dummy molded part 44 receives from the entire dummy molded part 44. Differences between the shapes are less likely to occur, and therefore, the surface quality of the molded plate 10 is less likely to deteriorate. Furthermore, even if there is a difference in resistance, the difference can be reduced, so even when pushing the choke 91 into the flow path 2 to further adjust the resistance within the flow path 2, the amount of push of the choke 91 can be reduced. can be made so that it does not have to be large. Therefore, deterioration of the surface quality of the molded plate 10 due to the chalk 91 can be made less likely to occur.

The molding material that has flowed through the channel 2 as described above is extruded out of the extrusion mold 1 through the extrusion port 3. By cutting the molding material extruded from the extrusion port 3 into arbitrary lengths, an uncured molded body (green sheet) is obtained. An uneven pattern may be formed on the surface of this uncured molded body by pressing or the like. In this case, a building board having an uneven pattern can be formed.

Next, the uncured molded body is cured and hardened. As a result, a molded plate 10 having a plurality of hollow portions 101 and portions at both ends where no hollow portion 101 is formed, as shown in FIG. 1, is obtained.

As is clear from the above embodiment, the extrusion mold 1 according to the first aspect of the present invention is an extrusion mold 1 for manufacturing a molded plate 10 having a plurality of hollow parts 101 by extrusion molding. The extrusion mold 1 includes a flow path 2 through which a molding material flows, an extrusion port 3 communicating with the flow path 2, and a molding member 4 disposed within the flow path 2 and forming a hollow portion 101. The molded member 4 includes a support portion 41 held within the channel 2, and a hollow molded portion 43 and a dummy molded portion 44 supported at the end of the support portion 41 on the extrusion port 3 side. The hollow molded part 43 and the dummy molded part 44 are arranged in one direction along the opening surface 31 of the extrusion port 3. The hollow molded part 43 includes a plurality of hollow pins 71 that protrude from the support part 41 toward the extrusion port 3 and a plurality of first adjustment parts 81 . The hollow pins 71 and the first adjustment portions 81 are arranged alternately in the aforementioned direction along the opening surface 31 of the extrusion port 3. The dummy molding section 44 includes a plurality of dummy pins 72 that protrude from the support section 41 toward the extrusion port 3 and a plurality of second adjustment sections 82 . The dummy pins 72 and the second adjustment portions 82 are arranged alternately in the aforementioned direction along the opening surface 31 of the extrusion port 3. The dummy pin 72 is shorter than the hollow pin 71, and the size of the second adjustment part 82 is larger than the size of the first adjustment part 81.

According to the first aspect, it is possible to provide an extrusion mold 1 that is used to manufacture a molded plate 10 having a hollow portion 101 and that makes it difficult to cause defects on the surface of the molded plate 10.

In the extrusion mold according to the second aspect of the present invention, in the first aspect, the space 20 from the end of the support part 41 on the extrusion port 3 side in the flow path 2 to the extrusion port 3 is the opening of the extrusion port 3. It includes a hollow molding space 23 and a dummy molding space 24 that are arranged in the above direction along the surface 31. A hollow molding part 43 is arranged in the hollow molding space 23, and a dummy molding part 44 is arranged in the dummy molding space 24. The ratio of the average volume of the hollow molding space 23 to the average volume of the dummy molding space 24 is within the range of 1.0:1.0 to 1.0:1.08.

According to the second aspect, defects on the surface of the molded plate 10 can be made less likely to occur.

In the extrusion mold according to the third aspect of the present invention, in the first or second aspect, the first adjusting part 81 and the second adjusting part 82 , each end on the extrusion port 3 side forms an acute angle toward the extrusion port 3 .

According to the third aspect, when the molding material that branches and flows around the support part 41 in the flow path 2 joins, the molding material flows along the surfaces of the first adjustment part 81 and the second adjustment part 82. By doing so, it becomes easier to merge smoothly, and therefore molding defects are less likely to occur.

In the extrusion mold 1 according to the fourth aspect of the present invention, in any one of the first to third aspects, the first adjustment part 81 is The tip on the extrusion port 3 side is arranged inside the contour of the hollow pin 71, and the tip on the extrusion port 3 side of the second adjustment part 82 is arranged inside the contour of the dummy pin 72.

According to the fourth aspect, since the first adjustment section 81 and the second adjustment section 82 hardly inhibit the flow of the molding material, molding defects are even less likely to occur.

In the extrusion mold 1 according to the fifth aspect of the present invention, in any one of the first to fourth aspects, the first adjustment part 81 is The whole of the second adjustment part 82 is arranged inside the outline of the hollow pin 71, and the entire second adjustment part 82 is arranged inside the outline of the dummy pin 72.

According to the fifth aspect, the first adjustment section 81 and the second adjustment section 82 hardly inhibit the flow of the molding material, so that molding defects are even less likely to occur.

1 Extrusion mold 2 Channel 20 Space 23 Hollow molding space 24 Dummy molding space 3 Extrusion port 31 Opening surface 4 Molding member 41 Support part 43 Hollow molding part 44 Dummy molding part 71 Hollow pin 72 Dummy pin 81 First adjustment part 82 Second Adjustment part 10 Molded plate 101 Hollow part

Claims (5)

An extrusion mold for manufacturing a molded plate having a plurality of hollow parts by extrusion molding,
comprising a flow path through which a molding material flows, an extrusion port communicating with the flow path, and a molding member disposed within the flow path and molding the hollow portion,
The molded member includes a support part held in the flow path, a hollow molded part and a dummy molded part supported by an end of the support part on the extrusion port side, and the hollow molded part and the dummy molded part are connected to each other. The dummy molding part is arranged in one direction along the opening surface of the extrusion port,
The hollow molded part includes a plurality of hollow pins that protrude from the support part toward the extrusion port, and a plurality of first adjustment parts, and the hollow pins and the first adjustment parts are arranged along the opening surface. line up alternately in the direction,
The dummy molding part includes a plurality of dummy pins and a plurality of second adjustment parts that protrude from the support part toward the extrusion port, and the dummy pins and the second adjustment parts are arranged in the direction along the opening surface. line up alternately,
The dummy pin is shorter than the hollow pin, and when viewed in the direction in which the hollow pin and the dummy pin are lined up, the tip of the second adjustment section on the extrusion port side is longer than the tip of the first adjustment section on the extrusion port side. also protrudes toward the extrusion port side ,
Extrusion mold. The space from the end of the support part on the extrusion port side in the flow path to the extrusion port includes the hollow molding space and the dummy molding space arranged in one direction, and the hollow molding space includes the hollow molding part. is arranged, the dummy molding part is arranged in the dummy molding space,
The ratio of the average volume of the hollow molding space to the average volume of the dummy molding space is within the range of 1.0:1.0 to 1.0:1.08.
The extrusion mold according to claim 1. When viewed in the one direction, the ends of the first adjustment section and the second adjustment section on the extrusion port side form an acute angle toward the extrusion port,
The extrusion mold according to claim 1 or 2. When viewed in the one direction, the tip of the first adjustment section on the extrusion port side is arranged inside the contour of the hollow pin, and the tip of the second adjustment section on the extrusion port side is arranged inside the contour of the dummy pin. located inside the
The extrusion mold according to any one of claims 1 to 3. When viewed in the one direction, the entire first adjustment part is arranged inside the outline of the hollow pin, and the entire second adjustment part is arranged inside the outline of the dummy pin.
The extrusion mold according to any one of claims 1 to 4.

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