JP5768604B2 - Method and apparatus for producing foamed resin molded body - Google Patents

Description

  The present invention relates to a foamed resin in which a foamed resin molded body having a skin layer and a foamed layer is formed by filling a foamable resin into a cavity of a mold and then a part of the skin layer is opened to expose the foamed layer. The present invention relates to a method and an apparatus for manufacturing a molded body.

  Conventionally, in the field of various industrial parts such as automobile parts, foamed resin molded articles having excellent characteristics such as lightness, heat insulation and soundproofing have been widely adopted. Such a foamed resin molded body is molded by selecting a suitable material for use according to the purpose and application to be used, and by suitably setting various conditions such as the form of bubbles inside the molded body and the expansion ratio. ing.

  As a method for molding such a foamed resin molded body, after filling a foamable resin containing a foaming agent in a resin into a mold cavity composed of a fixed mold and a movable mold, the movable mold is moved in the mold opening direction. Thus, there is known a molding method (so-called core back method) in which foaming of the foamable resin is promoted by enlarging the volume of the cavity.

  The foamed resin molded body molded by such a molding method is a non-foamed skin which is a surface layer on the surface of the foamed resin molded body by cooling the foamable resin filled in the cavity of the mold from the surface by the mold. As the layer is formed, a foamed layer in which foaming of the foamable resin is promoted is formed inside the skin layer.

  When the foamed resin molded body molded in this way is used as a heat insulating material or a soundproofing material, the heat insulating effect and the soundproofing effect are lowered by the skin layer formed on the surface of the foamed resin molded body. In order to effectively obtain a soundproofing effect, it is desirable to remove the skin layer formed on the surface.

  Although it does not remove the skin layer in order to prevent the heat insulation effect and the soundproofing effect from decreasing, for example, in Patent Document 1, after laminating the adhesive sheet on the surface of the foam, it is on the side opposite to the adhesive sheet. A structure in which the entire skin layer formed on the foam surface is removed by slicing with a slicing blade is disclosed.

JP-A-6-344459

  As described in Patent Document 1, by slicing and removing the entire skin layer formed on the surface, the foamed layer is exposed and a heat insulating effect and a soundproofing effect can be effectively obtained in the foamed resin molded body. However, if the entire skin layer is removed, there is a problem that the strength of the foamed resin molded product is greatly reduced.

  On the other hand, by forming a part of the skin layer formed on the surface after molding the foamed resin molded body and exposing the foamed layer, the heat insulating effect is suppressed while suppressing the strength of the foamed resin molded body from being lowered. It is considered that a soundproofing effect can be obtained effectively.

  As a method of opening a part of the skin layer formed on the surface in this way and exposing the foam layer, the rib part is formed integrally with the main body part of the foamed resin molded body, and then the rib part is broken. It is conceivable that the foam layer is exposed by opening the skin layer corresponding to the rib portion.

  FIG. 15 is an explanatory diagram for explaining a method of exposing a foam layer by opening a part of the skin layer in the foam resin molding, and FIG. 15 (a) shows a main body portion and ribs of the foam resin molding. FIG. 15B shows a state where the rib portion is broken and the foamed layer of the foamed resin molded body is exposed.

  As shown in FIG. 15A, a main body 101 having a skin layer 102 formed on the surface and a foam layer 103 provided inside the skin layer 102, and a skin layer 102 on the surface of the main body 101. 15 (b) by forming a foamed resin molded body 100 integrally formed with a non-foamed rib portion 105 extending from the outside, and then applying a predetermined falling force F1 to the rib portion 105 from the outside. As shown in FIG. 5, it is conceivable that a part of the skin layer 102 of the main body 101 is opened together with the rib portion 105 to form an opening 102 a in the skin layer 102 to expose the foam layer 103.

  FIG. 16 is an explanatory view for explaining a method of integrally forming the main body portion and the rib portion of the foamed resin molded body, and FIG. 16 (a) shows a molding die composed of a fixed die and a movable die. FIG. 16 (b) shows a state in which the movable mold is moved in the mold opening direction after filling the cavity of the mold with the foamable resin.

  As shown in FIG. 16A, the foamed resin molded body 100 shown in FIG. 15A has a cavity 110a formed by the fixed mold 111 and the movable mold 121 and a rib portion on the cavity surface 111a of the fixed mold 111. After the mold 110 provided with the recess 111b for forming 105 is filled with the foamable resin 131 through the injection path 116 in the cavity 110a of the mold 110, as shown in FIG. It can be molded by moving 121 in the mold opening direction (direction indicated by arrow X1) to promote foaming of the foamable resin 131.

  FIG. 17 is an explanatory diagram for explaining a state in which the rib portion of the foamed resin molded body is broken. In order to break the rib portion 105 in the foamed resin molded body 100 molded as shown in FIG. 14, the rib portion 105 is formed on the rib portion 105 of the foamed resin molded body 100 as shown in FIG. When a predetermined falling force F1 is applied from the outside in a direction substantially perpendicular to the direction in which the rib extends, the skin layer 102 continuous to the rib portion 105 is largely peeled off together with the rib portion 105 as shown in FIG. There exists a possibility that the intensity | strength of the foamed resin molding 100 may fall.

  Therefore, the present invention provides a method and apparatus for producing a foamed resin molded body capable of exposing a foamed layer by opening a part of the skin layer while suppressing a decrease in strength of the foamed resin molded body by a relatively simple method. The purpose is to provide.

  For this reason, the invention according to claim 1 of the present application uses a pair of molds including a fixed mold and a movable mold, and fills the cavity of the mold with a molten foamable resin to form a skin that is a surface layer. A method for producing a foamed resin molded article, comprising: forming a foamed resin molded article having a layer and a foamed layer provided inside the skin layer; and exposing the foamed layer by opening a part of the skin layer. , After filling the mold cavity with the foamable resin to form a foamed resin molded body having a skin layer and a foamed layer, in the cooling process of the foamed resin molded body, rotatably inserted into the mold And rotating a pin-like member having a blade portion for opening a part of the skin layer at the tip of the cavity side so that the foam layer is exposed by opening a part of the skin layer. did It is characterized in.

The invention according to claim 2 of the present application is the invention according to claim 1, wherein the pin-shaped member, said blade portion with the circular columnar also be formed in a circular cylindrical shape on the outer peripheral side of the pin-like member It is formed so as to extend to project the central axis and the flat line of the pin-like member, characterized in that.

Further, the invention according to claim 3 of the present application is the invention according to claim 1, wherein the pin-shaped member has the cavity side of the cylindrical portion formed in a circular cylindrical shape at the tip portion, said blade section The cylindrical portion is provided so as to extend from the cavity side in the central axis direction of the pin-like member.

  Still further, the invention according to claim 4 of the present application is the invention according to claim 3, wherein the blade portion is in the cavity from the cavity surface of the molding die at least the thickness of the skin layer of the foamed resin molded body. It is provided so that it may protrude.

  Furthermore, in the invention according to claim 5 of the present application, in the invention according to claim 3 or claim 4, the pin-like member jets air from the tip end portion on the cavity side into the pin-like member. The air supply hole is provided, and when the foamed resin molded body is released from the mold, air is ejected to the blade portion through the air supply hole.

  Furthermore, in the invention according to claim 6 of the present application, in the invention according to any one of claims 1 to 5, the pin-shaped member is configured to release the foamed resin molded body from the mold. It also serves as an ejector pin.

  Furthermore, the invention according to claim 7 of the present application is the invention according to any one of claims 1 to 6, wherein the molding die is configured to form the pin-shaped member when molding the foamed resin molded body. The skin layer of the foamed resin molded body located in the vicinity is configured to be thinner than other portions of the skin layer of the foamed resin molded body.

  Furthermore, the invention according to claim 8 of the present application includes a pair of molds including a fixed mold and a movable mold, and injection means for injecting a molten foamable resin into a cavity of the mold, After injecting a molten foamable resin into the cavity, a foamed resin molded body having a skin layer as a surface layer and a foam layer provided inside the skin layer is molded, and then a part of the skin layer is opened. An apparatus for manufacturing a foamed resin molded body that exposes the foamed layer, wherein the blade is rotatably inserted into the mold and opens a part of the skin layer at the tip of the cavity side A pin-shaped member having rotation, a rotation driving means for rotating the pin-shaped member, and a rotation control means for controlling the operation of the rotation driving means. The rotation control means has the foaming property in the cavity. Tree After the foamed resin molded body having the skin layer and the foamed layer is molded by injecting, the pin-shaped member is rotated in the cooling process of the foamed resin molded body, and a part of the skin layer is formed by the blade portion. The operation of the rotation driving means is controlled so that the foam layer is exposed by opening the opening.

  According to the invention of claim 1 of the present application, after the foamed resin molded body having the skin layer and the foamed layer is formed by filling the mold cavity with the foamable resin, in the cooling process of the foamed resin molded body, A pin-shaped member that is rotatably inserted into the mold and has a blade for opening a part of the skin layer at the tip of the cavity side is rotated, and a part of the skin layer is opened to expose the foam layer. Let

  As a result, the skin layer is largely prevented from peeling off, and the foam layer is exposed by opening a part of the skin layer of the foam resin molded product while suppressing a decrease in strength of the foam resin molded product by a relatively simple method. Can be made. Therefore, it is possible to relatively easily produce a foamed resin molded body that can improve the soundproofing effect and the heat insulating effect of the foamed resin molded body while suppressing a decrease in strength. In addition, there is no need to provide a separate post-process for cutting the rib portion by an operator or machine after the rib portion for opening the skin layer and exposing the foam layer is integrally formed with the main body portion of the foamed resin molded body. Further, it is possible to reduce the manufacturing process and manufacturing cost of the foamed resin molded body.

Further, according to the invention according to claim 2 of the present application, the pin-like member has a central axis of the pin-like member cutting portion with the circular columnar also be formed in a circular cylindrical shape on the outer peripheral side of the pin-like member by being formed so as to extend projecting flat row, it is possible to provide a pin-like member capable of realizing these effects more specifically.

Furthermore, according to the invention according to claim 3 of the present application, the pin-like member has a cylindrical portion formed in a circular cylindrical shape at the tip of the cavity-side, the blade section, the pin from the cavity side of the cylindrical portion By being provided so as to extend in the central axis direction of the member, it is possible to provide a pin-like member that can realize the effect more specifically.

  Still further, according to the invention according to claim 4 of the present application, the blade portion is provided so as to protrude into the cavity by at least the thickness of the skin layer of the foamed resin molded body from the cavity surface of the mold. In addition, a part of the skin layer of the foamed resin molding can be reliably opened, and the above-described effects can be effectively achieved.

  Still further, according to the invention of claim 5 of the present application, the pin-shaped member has an air supply hole for ejecting air from the tip end portion on the cavity side inside the pin-shaped member, and foams from the mold. When releasing the resin molded body, air is ejected through the air supply hole to the blade portion, so that even if a skin layer or foam layer adheres to the blade portion, there is no need to provide a separate step for removing the skin on the blade portion. It is possible to prevent the layer or the foamed layer from remaining.

  Furthermore, according to the invention according to claim 6 of the present application, the pin-shaped member also serves as an ejector pin for releasing the foamed resin molded body from the molding die, so that the ejector pin is adjacent to the pin-shaped member. Therefore, the manufacturing cost can be reduced as compared with the case where the ejector pin is separately provided in the vicinity of the pin-shaped member.

  Furthermore, according to the invention according to claim 7 of the present application, when the molding die is molded, the skin layer of the foamed resin molded body positioned in the vicinity of the pin-shaped member is used as the skin of the foamed resin molded body. By being comprised so that it may be thinner than the other part of a layer, a part of skin layer of a foamed resin molding can be opened more reliably, and the said effect can be show | played more effectively.

  Furthermore, according to the invention according to claim 8 of the present application, a pin-shaped member that is rotatably inserted into the mold and has a blade portion for opening a part of the skin layer at the tip portion on the cavity side; Rotation drive means for rotationally driving the pin-shaped member, and rotation control means for controlling the operation of the rotation drive means. The rotation control means injects the foamable resin into the cavity to thereby form the skin layer and the foam layer. And rotating the pin-like member in the cooling process of the foamed resin molded body to open a part of the skin layer by the blade portion to expose the foamed layer. Control the operation of

  Thereby, with a relatively simple configuration, the skin layer is largely prevented from peeling off, and the foam layer is formed by opening a part of the skin layer of the foam resin molded product while suppressing a decrease in strength of the foam resin molded product. Can be exposed. Therefore, it is possible to relatively easily produce a foamed resin molded body that can improve the soundproofing effect and the heat insulating effect of the foamed resin molded body while suppressing a decrease in strength. In addition, there is no need to provide a separate post-process for cutting the rib portion by an operator or machine after the rib portion for opening the skin layer and exposing the foam layer is integrally formed with the main body portion of the foamed resin molded body. Further, it is possible to reduce the manufacturing process and manufacturing cost of the foamed resin molded body.

It is a schematic explanatory drawing which shows the manufacturing apparatus of the foaming resin molding which concerns on 1st Embodiment of this invention. It is a figure which shows the pin-shaped member used for the shaping | molding die of the said manufacturing apparatus which concerns on 1st Embodiment. It is explanatory drawing for demonstrating the manufacturing process of a foamed resin molding. It is a figure which shows the principal part of the foamed resin molding manufactured in the said manufacturing apparatus which concerns on 1st Embodiment. It is a figure which shows the principal part of another foamed resin molding manufactured in the said manufacturing apparatus which concerns on 1st Embodiment. It is explanatory drawing for demonstrating the modification of the said pin-shaped member. It is a figure which shows the principal part of the shaping | molding die of the manufacturing apparatus of the foaming resin molding which concerns on 2nd Embodiment of this invention. It is a figure which shows the pin-shaped member used for the said shaping | molding die concerning 2nd Embodiment. It is a figure which shows the principal part of the foaming resin molding manufactured in the said manufacturing apparatus which concerns on 2nd Embodiment. It is sectional drawing which shows the modification of the blade part of the pin-shaped member used for the said shaping | molding die concerning 2nd Embodiment. It is a figure which shows the principal part of the shaping | molding die of the manufacturing apparatus of the foaming resin molding which concerns on 3rd Embodiment of this invention. It is a figure which shows the pin-shaped member used for the said shaping | molding die concerning 3rd Embodiment. It is a figure which shows the principal part of the foamed resin molding manufactured in the said manufacturing apparatus which concerns on 3rd Embodiment. It is sectional drawing which shows the modification of the blade part of the pin-shaped member used for the said shaping | molding die concerning 3rd Embodiment. It is explanatory drawing for demonstrating the method to open a part of skin layer and to expose a foam layer in a foamed resin molding. It is explanatory drawing for demonstrating the method to shape | mold integrally the main-body part and rib part of a foamed resin molding. It is explanatory drawing for demonstrating the state which broke the rib part of the foamed resin molding.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a schematic explanatory view showing an apparatus for producing a foamed resin molded body according to a first embodiment of the present invention. As shown in FIG. 1, a manufacturing apparatus M for manufacturing a foamed resin molded body according to the first embodiment of the present invention includes a pair of molding dies 10 including a fixed die 11 and a movable die 16, and a molding die 10. An injection device 30 is provided as injection means for injecting a molten foamable resin into the cavity 10a.

  The molding die 10 includes a fixed die 11 that is always kept stationary, and a movable die 16 that is provided so as to be movable in the opening / closing direction of the molding die 10 (in the direction indicated by the arrow X2 in FIG. 1). Then, by combining the fixed mold 11 and the movable mold 16 with each other, a cavity 10a corresponding to a predetermined shape of the foamed resin molded body is formed.

  The fixed mold 11 has a cavity surface 11a formed corresponding to a predetermined shape of the foamed resin molded body, and also has an injection path 12 for injecting a molten foamable resin from the injection device 30 into the cavity 10a. ing.

  On the other hand, the movable mold 16 includes a body portion 17 that has a cavity surface 17 a formed corresponding to a predetermined shape of the foamed resin molded body and is combined with the fixed mold 11. A hole 17b having a circular cross section in the opening / closing direction of the mold 10 is formed in the main body portion 17, and a pin-shaped member 20 formed in a circular cross section is rotatably inserted into the hole 17b. Has been.

  FIG. 2 is a view showing a pin-shaped member used for a mold of the manufacturing apparatus according to the first embodiment, FIG. 2A is a side view of the pin-shaped member, and FIG. It is the front view of the said pin-shaped member seen from the arrow V1 direction in 2 (a). As shown in FIGS. 2A and 2B, the pin-shaped member 20 is formed in a substantially columnar shape, and is provided on a columnar portion 21 formed in a columnar shape and a cavity surface 21 a of the columnar portion 21. The blade portion 25 is provided.

  The blade portion 25 of the pin-shaped member 20 is provided on the outer peripheral side of the pin-shaped member 20 in the cavity surface 21a of the cylindrical portion 21 of the pin-shaped member 20, and extends so as to protrude substantially parallel to the central axis C1 of the pin-shaped member 20. Is provided. The pin-shaped member 20 is disposed so that the cavity surface 21 a is substantially flush with the cavity surface 17 a of the main body portion 17 located on the outer periphery of the pin-shaped member 20.

  The molding die 10 is provided with a rotational drive means (not shown) such as a servo motor for rotationally driving the pin-shaped member 20, and the pin-shaped member 20 is connected to the rotational drive means and is connected to the central axis C1. It is comprised so that it can rotate in the direction shown by arrow R1. In addition, the blade part 25 of the pin-shaped member 20 is provided in order to open a part of the skin layer of the foamed resin molded body and expose the foamed layer, as will be described later.

  In the present embodiment, the mold 10 is formed using a metal material, but in the main body 17 of the movable mold 16, the cavity surface 17 a around the hole 17 b is heated more than the other parts of the mold 10. The sheet member 18 is made of a material having low conductivity, for example, a heat-resistant polyimide material. Although not limited to this, the sheet member 18 is formed in a disk shape. Instead of the sheet member 18, the cavity surface 17a around the hole 17b may be coated with an inorganic oxide having a low thermal conductivity such as alumina or silica.

  The manufacturing apparatus M is provided with mold moving means (not shown) such as a servo motor for moving the movable mold 16 in the opening / closing direction of the mold 10, and the movable mold 16 is connected to the mold moving means. Yes. Accordingly, the mold 10 is configured such that the movable mold 16 can move in the opening / closing direction of the mold 10 with respect to the fixed mold 11, and the movable mold 16 is molded after the fixed mold 11 and the movable mold 16 are closed. The volume of the cavity can be expanded by moving in 10 mold opening directions.

  The injection device 30 is for injecting a foamed resin 31 in a molten state into the cavity 10 a of the mold 10, and includes a cylinder 33 for kneading and melting the resin 32, and a screw 34 is provided inside the cylinder 33. . A screw drive mechanism and an injection mechanism (both not shown) are connected to the rear end of the screw 34.

  In the injection device 30, the resin 32 put in the cylinder 33 is sequentially heated and kneaded and melted by a heater (not shown) and a screw 34 provided around the cylinder 33. Then, the inert gas made supercritical through the supercritical fluid generator 36 from a cylinder 35 containing an inert gas such as carbon dioxide or nitrogen is injected into the kneaded and melted resin 32 through supercritical fluid injection. A foamable resin 31 that is injected by the device 37 and contains a foaming agent in the resin 32 is formed.

  The foamable resin 31 in the cylinder 33 is injected into the cavity 10a of the mold 10 through the injection path 12 of the fixed mold 11 by the screw 34 being rotated by the screw drive mechanism and being injected by the injection mechanism.

  In the present embodiment, as the resin 32, for example, a thermoplastic resin such as a polypropylene resin is used. Moreover, in this embodiment, although the fluid in a supercritical state is used as a physical foaming agent for the foaming agent contained in the foamable resin 31, other physical foaming agents may be used. Alternatively, chemical blowing agents can be used.

  In addition, the manufacturing apparatus M includes a control unit (not shown) that comprehensively controls the manufacturing apparatus M. The control unit is configured to perform various controls such as the opening / closing drive of the mold 10, the rotational drive of the pin-shaped member 20 of the mold 10, and the injection mechanism of the foamable resin 31 of the injection device 30. The control unit is configured with a microcomputer as a main part, for example.

Next, production of the foamed resin molded body using the production apparatus M will be described.
As shown in FIG. 1, first, the mold 10 is a mold in a state where the cavity surface 17 a of the main body portion 17 of the movable mold 16 and the cavity surface 21 a of the columnar portion 21 of the pin-shaped member 20 are arranged substantially flush. Closed. Then, a foamable resin 31 containing a resin 32 containing a supercritical fluid as a foaming agent is injected into the cavity 10 a of the mold 10 from the injection device 30, and the foamable resin 31 in a molten state is injected into the cavity of the mold 10. After filling 10a, the movable mold 16 is moved in the mold opening direction so as to enlarge the volume of the cavity 10a of the mold 10.

  FIG. 3 is an explanatory diagram for explaining a manufacturing process of the foamed resin molded body. FIG. 3A shows a state where the cavity 10a of the mold 10 is filled with the foamable resin 31, and FIG. b) shows a state in which the movable mold 16 is moved in the mold opening direction after the foamable resin 31 is filled in the cavity 10a.

  As shown in FIG. 3A, after the cavity 10a of the mold 10 is filled with the foamable resin 31 through the injection path 12, the volume of the cavity 10a is expanded as shown in FIG. 3B. The movable mold 16 is moved together with the pin-shaped member 20 in the mold opening direction (direction indicated by the arrow X3) to promote foaming of the foamable resin 31.

  When the movable mold 16 is moved to a predetermined position in the mold opening direction, the foamed resin molded body 40 having a predetermined shape is molded. The foamable resin 31 is cooled from its surface by the molding die 10, and the foamed resin molded body 40 has a non-foamed skin layer 42 as a surface layer and foaming of the foamable resin 31 is promoted inside the skin layer 42. The foam layer 43 is formed.

  The blade portion 25 of the pin-shaped member 20 inserted through the molding die 10 is equal to or greater than the thickness of the skin layer 42 of the foamed resin molded body 40 located in the vicinity of the pin-shaped member 20 when the foamed resin molded body 40 is molded. As shown in FIG. 3 (b), the foamed resin molded body 40 is notched in a triangular pyramid shape in the skin layer 42 by the blade portion 25 of the pin-like member 20, as shown in FIG. A cut-out portion 40a is formed.

  In this embodiment, since the cavity surface 17a around the pin-shaped member 20 is formed by the sheet member 18 made of a material having a lower thermal conductivity than the other parts of the mold 10, the foamed resin molded body 40 is molded. In this case, the skin layer 42 of the foamed resin molded body 40 located in the vicinity of the pin-shaped member 20 is formed thinner than the other part of the skin layer 42 of the foamed resin molded body 40.

  After forming the foamed resin molded body 40 having the skin layer 42 and the foamed layer 43 in this manner, the foamed resin that cools the foamed resin molded body 40 in the mold 10 while the movable mold 16 is held at a predetermined position. In the cooling process of the molded body 40, the pin-shaped member 20 is rotated with respect to the movable mold 16 to manufacture the foamed resin molded body 40.

  FIG. 4 is a view showing a main part of the foamed resin molded body manufactured by the manufacturing apparatus according to the first embodiment, and FIG. 4A is a foamed resin molded part in which a part of the skin layer 42 is opened. Sectional drawing which shows the principal part of the body 40, FIG.4 (b) is a front view which shows the principal part of the foamed resin molding 40 seen from the arrow V2 direction in Fig.4 (a).

  After the foamed resin molded body 40 is molded, the pin-shaped member 20 is rotated 360 degrees or more in the direction indicated by the arrow R1 with respect to the central axis C1 as shown in FIGS. 4 (a) and 4 (b). In addition, the foamed resin molded body 40 is formed with an opening 40b formed in a circular shape in front view by the blade portion 25 of the pin-shaped member 20 and formed in a triangular cross section.

  Since the blade portion 25 of the pin-shaped member 20 is provided so as to protrude into the cavity 10a more than the thickness of the skin layer 42 of the foamed resin molded body 40 located in the vicinity of the pin-shaped member 20, the opening 40b is It is formed so as to penetrate the skin layer 42 of the foamed resin molded body 40. In the foamed resin molded body 40, a part of the skin layer 42 is opened to expose the foamed layer 43.

  After the foamed resin molded body 40 is manufactured, the movable mold 16 is further moved in the mold opening direction to open the mold 10, and then the foamed resin molded body 40 is released from the mold 10. Then, the foamed resin molded body 40 is taken out.

  The mold 10 is provided with an ejector pin (not shown) for releasing the foamed resin molded body 40, and the foamed resin molded body 40 is released from the mold 10. The pin-shaped member 20 can also serve as an ejector pin for releasing the foamed resin molded body 40 from the mold 10. In such a case, it is not necessary to separately arrange the ejector pin near the pin-shaped member 20, and the manufacturing cost can be reduced as compared with the case where the ejector pin is separately provided near the pin-shaped member 20.

  Thus, in the present embodiment, after the foamed resin molded body 40 having the skin layer 42 and the foamed layer 43 is molded by filling the cavity 10 a of the mold 10 with the foamable resin 31, In the cooling process, the pin-shaped member 20 that is rotatably inserted into the mold 10 and has the blade portion 25 for opening a part of the skin layer 42 at the front end portion on the cavity 10a side is rotated. A part is opened to expose the foam layer 43.

  As a result, it is possible to prevent the skin layer 42 from being largely peeled off and to open a part of the skin layer 42 of the foamed resin molded body 40 while suppressing a decrease in strength of the foamed resin molded body 40 by a relatively simple method. The foam layer 43 can be exposed. Therefore, the foamed resin molded body 40 capable of improving the soundproofing effect and the heat insulating effect of the foamed resin molded body 40 while suppressing the strength reduction can be manufactured relatively easily. In addition, there is no need to provide a separate post-process for cutting the rib portion by an operator or machine after the rib portion for opening the skin layer and exposing the foam layer is integrally formed with the main body portion of the foamed resin molded body. Further, it is possible to reduce the manufacturing process and manufacturing cost of the foamed resin molded body.

  Further, when the molding die 10 molds the foamed resin molded body 40, the skin layer 42 of the foamed resin molded body 40 located in the vicinity of the pin-shaped member 20 is made more than the other part of the skin layer 42 of the foamed resin molded body 40. Further, by being configured to be thin, a part of the skin layer 42 of the foamed resin molded body 40 can be opened more reliably.

  In the embodiment described above, after the foamed resin molded body 40 is molded, the pin-shaped member 20 is rotated 360 degrees or more in the direction indicated by the arrow R1 with respect to the central axis C1 in the cooling process of the foamed resin molded body 40. However, it is possible to rotate the pin-shaped member 20 by a predetermined angle.

  FIG. 5 is a view showing a main part of another foamed resin molded body manufactured in the manufacturing apparatus according to the first embodiment. In FIG. 5, the foamed resin manufactured by rotating the pin-shaped member 20 by 180 degrees. The main part of a molded object is shown. As shown in FIG. 5, the pin-shaped member 20 is rotated 180 degrees in the direction indicated by the arrow R1 with respect to the central axis C1, thereby causing the foamed resin molded body 40 to be brought into front view by the blade portion 25 of the pin-shaped member 20. It is also possible to form the opening 40c formed in a substantially semicircular shape and a triangular cross section.

  Thus, by adjusting the rotation angle of the pin-shaped member 20, it is possible to adjust the size of the foamed resin molded body 40 to open the skin layer 42 and expose the foamed layer 43. It is possible to effectively obtain the soundproofing effect and the heat insulating effect of the foamed resin molded body 40 while suppressing a decrease in strength.

  In the above-described embodiment, the mold 10 is formed by the sheet member 18 made of a material having a cavity surface 17 a around the pin-shaped member 20 having a lower thermal conductivity than the other parts of the mold 10. A sheet member made of a material having a lower thermal conductivity than the other part of the mold 10 is inserted into the cavity 10a inside the pin-shaped member 20, and the skin of the foamed resin molded body 40 located in the vicinity of the pin-shaped member 20 It is also possible to make the layer 42 thinner than other portions of the skin layer 42 of the foamed resin molded body 40.

  FIG. 6 is an explanatory diagram for explaining a modification of the pin-shaped member. As shown in FIG. 6, a foamed resin molded body using a pin-shaped member 50 in which a sheet member 28 made of a material having a lower thermal conductivity than the other part of the mold 10 is inserted into the cavity side of the cylindrical portion 21. It is also possible to make the skin layer 42 of the foamed resin molded body 40 located in the vicinity of the pin-shaped member 50 thinner than other portions of the skin layer 42 of the foamed resin molded body 40 when the 40 is molded. .

  In FIG. 6, a sheet member 28 made of a material having a lower thermal conductivity than the other part of the mold 10 is inserted into the cylindrical portion 21 of the pin-shaped member 50, but the cavity surface 21 a of the cylindrical portion 21 is It is also possible to form the sheet member 28. It is also possible to coat the cavity surface 21a of the cylindrical portion 21 with an inorganic oxide having a low thermal conductivity such as alumina or silica. Further, the blade portion 25 of the pin-shaped member 50 is formed from a material having a lower thermal conductivity than the other portions of the mold 10, or the surface 25 a of the blade portion 25 is inorganic oxide having a low thermal conductivity such as alumina or silica. You may make it coat with a thing.

  Further, in the present embodiment, the pin-shaped members 20 and 50 are formed in a substantially columnar shape and have a columnar portion 21 and a blade portion 25, but a cylinder formed in a substantially cylindrical shape with a cavity surface. It is also possible to use a pin-shaped member having a portion and a blade portion provided on the cavity surface of the cylindrical portion and formed in a substantially cylindrical shape.

  FIG. 7 is a view showing a main part of a molding die of a foamed resin molded body manufacturing apparatus according to the second embodiment of the present invention. Moreover, FIG. 8 is a figure which shows the pin-shaped member used for the said shaping | molding die concerning 2nd Embodiment, FIG. 8 (a) is sectional drawing of the said pin-shaped member, FIG.8 (b) is FIG. The front view of the said pin-shaped member seen from the arrow V3 direction in (a), FIG.8 (c) is sectional drawing of the blade part of the said pin-shaped member along the Y8c-Y8c line | wire in FIG.8 (b). .

  The foamed resin molded body manufacturing apparatus according to the second embodiment of the present invention is different from the manufacturing apparatus M according to the first embodiment of the present invention in that the pin-shaped member of the mold 10 is different and the pin-shaped member has air. Since the configuration is the same except that an air supply means for supplying is provided, the same components as those of the molding apparatus M according to the first embodiment of the present invention are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 7, also in the molding die of the foamed resin molding manufacturing apparatus according to the second embodiment of the present invention, the hole 17 b formed in the main body portion 17 of the movable die 16 is formed in a circular cross section. The pin-shaped member 60 is rotatably inserted, and as shown in FIGS. 8A, 8B, and 8C, the pin-shaped member 60 is formed in a substantially cylindrical shape, It has a columnar part 61 formed in a columnar shape, a cylindrical part 62 formed in a cylindrical shape on the cavity side of the columnar part 61, and a blade part 65 provided on the cavity side of the cylindrical part 62. .

  The blade portion 65 of the pin-shaped member 60 is provided so as to extend from the cavity 10a side of the cylindrical portion 62 to the central axis C1 in the direction of the central axis C1 of the pin-shaped member 60. The blade portion 65 extends in a direction perpendicular to the central axis C1 and is formed in a fan shape so as to cover a part of the space portion 62a formed in the cylindrical portion 62 on the cavity 10a side.

  Also in the pin-shaped member 60, the pin-shaped member 60 is configured to be rotatable in the direction indicated by the arrow R1 with respect to the central axis C1. In the blade portion 65 of the pin-shaped member 60, the angle formed by the end surface 65a on the front side in the rotational direction and the end surface 65b on the rear side in the rotational direction is not limited to this, but is set to 60 degrees.

  The blade portion 65 is formed such that an end surface 65c on the cavity side of the blade portion 65 extends in a direction substantially orthogonal to the central axis C1, and an end surface 65d opposite to the cavity side of the blade portion 65 is an end surface on the front side in the rotational direction. It forms so that it may space apart from the end surface 65c of a cavity side as it goes to the rotation direction back side from 65a, and the rotation direction front side is formed in the taper shape. Specifically, as shown in FIG. 8C, the blade portion 65 is formed in a trapezoidal cross section while the end surface 65a on the front side in the rotational direction is a sharp edge.

  The blade portion 65 is also provided so as to protrude from the cavity surface 17a of the main body portion 17 of the movable die 16 into the cavity 10a at least as thick as the skin layer of the foamed resin molded body. FIG. 7 shows a skin layer of a foamed resin molded body molded by filling the cavity 10a of the mold 10 with a foamable resin using a two-dot chain line. As shown in FIG. 65 is provided so as to protrude from the cavity surface 17a of the main body portion 17 into the cavity 10a by the thickness of the skin layer 72 of the foamed resin molding.

  The pin-like member 60 according to the second embodiment is provided with an air supply hole 61a for ejecting air from the tip portion on the cavity 10a side inside the pin-like member 60, specifically inside the cylindrical portion 60. It has been.

  In the manufacturing apparatus according to the second embodiment of the present invention, air supply means (not shown) such as a compressor for supplying air to the pin-shaped member 60 is provided, and air is supplied from the air supply means to the pin-shaped member 60. It is comprised so that it can supply. In the manufacturing apparatus, when the foamed resin molded body is released from the mold 10 by the control unit, the operation of the air supply unit is controlled, and air is ejected to the blade portion 65 through the air supply hole 61a. The

  Also in the foamed resin molded body manufacturing apparatus according to the second embodiment of the present invention configured as described above, the blade portion 65 extends from the cavity surface 17a of the main body portion 17 by the thickness of the skin layer of the foamed resin molded body. In a state where the pin-shaped member 60 is disposed so as to protrude toward the cavity 10a, the mold 10 is closed and the cavity 10a of the mold 10 is filled with a foamable resin.

  Thereafter, the movable mold 16 is moved in the mold opening direction so as to increase the volume of the cavity 10a of the mold 10, and a foamed resin molded body having a predetermined shape is molded. The foamed resin molded body is molded so as to have a non-foamed skin layer as a surface layer and a foamed layer in which foaming of the foamable resin is promoted inside the skin layer.

  In the foamed resin molded body, a skin layer as a surface layer is formed on the cavity 10a side of the space portion 62a in the cylindrical portion 62 of the pin-shaped member 60, but the blade portion 62 of the pin-shaped member 60 is formed. In the provided portion, the skin layer of the foamed resin molded body is cut out in a fan shape.

  Then, after molding the foamed resin molded body, in the cooling process of the foamed resin molded body in which the foamed resin molded body is cooled in the mold 10 with the movable mold 16 held in a predetermined position, On the other hand, the pin-shaped member 60 is rotated to manufacture the foamed resin molded body.

  FIG. 9 is a view showing a main part of the foamed resin molded body manufactured in the manufacturing apparatus according to the second embodiment, and FIG. 9A shows the foamed resin molded part in which a part of the skin layer is opened. Sectional drawing which shows the principal part of a body, FIG.9 (b) is a front view which shows the principal part of the foaming resin molding seen from the arrow V4 direction in Fig.9 (a).

  After the foamed resin molded body is molded, as shown in FIG. 7, the pin-shaped member 60 is rotated 360 degrees or more in the direction indicated by the arrow R1 with respect to the central axis C1, thereby FIG. 9 (a) and FIG. As illustrated in FIG. 9B, the foamed resin molded body 70 is formed with an opening 70 a that is formed in a circular shape in front view by the blade portion 65 of the pin-shaped member 60.

  Since the blade portion 65 is provided so as to protrude into the cavity 10 a by a thickness equal to or greater than the thickness of the skin layer 72 of the foamed resin molded body 70 located in the vicinity of the pin-shaped member 60, the opening 70 a is formed in the foamed resin molded body 70. In the foamed resin molded body 70, a part of the skin layer 72 is opened to expose the foamed layer 73. In addition, while rotating the pin-shaped member 60, the pin-shaped member 60 is gradually pushed out toward the cavity 10a by the thickness of the skin layer 72 or more, so that the skin layer 72 and the foamed layer 73 can be partially cut out. Thus, the foamed layer 73 can be exposed more reliably.

  After the foamed resin molded body 70 is manufactured, the movable mold 16 is further moved in the mold opening direction to open the mold 10, and then the foamed resin molded body 70 is released from the mold 10. The foamed resin molded body 70 is taken out, but in the manufacturing apparatus according to the second embodiment, when the foamed resin molded body 70 is released from the mold 10, air is ejected to the blade portion 65 through the air supply hole 61 a. .

  Thus, also in the present embodiment, after the foamed resin 31 is filled in the cavity 10a of the mold 10 and the foamed resin molded body 70 having the skin layer 72 and the foamed layer 73 is molded, the foamed resin molded body 70 is formed. In the cooling process, the pin-shaped member 60 that is rotatably inserted into the mold 10 and has the blade portion 65 is rotated to open a part of the skin layer 72 and expose the foam layer 73, whereby the skin layer The foam layer 73 is exposed by opening a part of the skin layer 72 of the foamed resin molded body 70 while suppressing the strength of the foamed resin molded body 70 from being reduced by a relatively simple method. Can be made.

  Further, the blade portion 65 is provided so as to protrude from the cavity surface 17a of the mold 10 into the cavity 10a at least the thickness of the skin layer 72 of the foamed resin molded body 70, so that the foamed resin molded body 70 has a thickness. A part of the skin layer 72 can be reliably opened, and the above effect can be effectively achieved.

  Furthermore, the pin-shaped member 60 has an air supply hole 61a for ejecting air from the tip portion on the cavity 10a side inside the pin-shaped member 60, and releases the foamed resin molded body 70 from the mold 10. At this time, by blowing air through the air supply hole 61a to the blade portion 65, even if a skin layer or a foam layer is attached to the blade portion 65, a step for removing the skin layer or foam is not provided in the blade portion 65. It is possible to prevent the layer from remaining.

  FIG. 10 is a cross-sectional view showing a modification of the blade portion of the pin-shaped member used in the mold according to the second embodiment. In FIG. 10, the cross-section shown in FIG. It shows in the cross section corresponding to. As shown in FIG. 10A, as the blade portion 65 of the pin-shaped member 60 used in the mold according to the second embodiment, the end surface 65a on the front side in the rotational direction is a sharp edge and has a triangular cross section. As shown in FIG. 10B, the end surface 65a on the front side in the rotational direction has a sharp edge and is formed in a trapezoidal cross section, and the end surface 65a protrudes toward the cavity 10a. As shown in FIG. 10C, the end surface 65a on the front side in the rotational direction has a sharp edge and is formed in a triangular shape, and the end surface 65a faces the cavity 10a. What is formed so as to protrude can be used. As shown in FIGS. 10 (b) and 10 (c), as the blade portion 65, when the end surface 65a is formed so as to protrude toward the cavity 10a, the end surface on the cavity side of the blade portion 65 is used. The skin layer formed on the surface of 65c can be easily removed.

  FIG. 11: is a figure which shows the principal part of the shaping | molding die of the manufacturing apparatus of the foaming resin molding which concerns on 3rd Embodiment of this invention. Moreover, FIG. 12 is a figure which shows the pin-shaped member used for the said shaping | molding die concerning 3rd Embodiment, FIG. 12 (a) is sectional drawing of the said pin-shaped member, FIG.12 (b) is FIG. The front view of the said pin-shaped member seen from the arrow V5 direction in (a), FIG.12 (c) is sectional drawing of the blade part of the said pin-shaped member along the Y12c-Y12c line | wire in FIG.12 (b). .

  The manufacturing apparatus for a foamed resin molded body according to the third embodiment of the present invention includes the manufacturing apparatus according to the second embodiment of the present invention and the blade portion of the pin-shaped member of the mold 10 on the central axis of the pin-shaped member. Since it is the same except that it is provided so as to incline toward the cavity as it goes, the same components as those of the manufacturing apparatus according to the second embodiment of the present invention are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 11, also in the molding die of the foamed resin molded body manufacturing apparatus according to the third embodiment of the present invention, the hole 17b formed in the main body portion 17 of the movable die 16 has a circular cross section. The pin-shaped member 80 is rotatably inserted. As shown in FIGS. 12 (a), 12 (b) and 12 (c), the pin-shaped member 80 is formed in a substantially cylindrical shape, It has a columnar portion 61 formed in a columnar shape, a cylindrical portion 62 formed in a cylindrical shape on the cavity side of the columnar portion 61, and a blade portion 85 provided on the cavity side of the cylindrical portion 62.

  The blade portion 85 of the pin-shaped member 80 is provided so as to extend from the cavity 10a side of the cylindrical portion 62 to the central axis C1 in the direction of the central axis C1 of the pin-shaped member 80, and is a space portion 62a formed in the cylindrical portion 62. The fan 10 is formed in a fan shape so as to cover a part on the cavity 10 a side, but is inclined to the cavity 10 a side toward the central axis C <b> 1 of the pin-shaped member 80.

  Also in the pin-shaped member 80, the pin-shaped member 80 is configured to be rotatable in the direction indicated by the arrow R1 with respect to the central axis C1. In the blade portion 85 of the pin-shaped member 80, the angle formed by the end surface 85a on the front side in the rotational direction and the end surface 85b on the rear side in the rotational direction is not limited to this, but is set to 60 degrees.

  The blade portion 85 is formed such that the end surface 85c on the cavity side of the blade portion 85 has a predetermined angle with the central axis C1, and the end surface 85c opposite to the cavity side of the blade portion 85 is from the end surface 85a on the front side in the rotational direction. It forms so that it may space apart from the end surface 85c by the side of a cavity as it goes to the rotation direction back side, and the rotation direction front side is formed in the taper shape. Specifically, as shown in FIG. 12C, the blade portion 85 is formed in a trapezoidal cross section while the end surface 85a on the front side in the rotational direction is a sharp edge.

  The blade portion 85 is also provided so as to protrude from the cavity surface 17a of the main body portion 17 of the movable die 16 into the cavity 10a at least as thick as the skin layer of the foamed resin molded body. FIG. 11 shows a skin layer of a foamed resin molded body molded by filling the cavity 10a of the mold 10 with a foamable resin using a two-dot chain line. As shown in FIG. 85 is provided so as to protrude from the cavity surface 17a of the main body portion 17 into the cavity 10a by a thickness equal to or greater than the thickness of the skin layer 92 of the foamed resin molding.

  Also in the foamed resin molded body manufacturing apparatus according to the third embodiment of the present invention configured as described above, the blade portion 85 from the cavity surface 17a of the main body portion 17 is equal to or greater than the thickness of the skin layer of the foamed resin molded body. In a state where the pin-shaped member 80 is disposed so as to protrude toward the cavity 10a, the mold 10 is closed and the cavity 10a of the mold 10 is filled with a foamable resin.

  Thereafter, the movable mold 16 is moved in the mold opening direction so as to increase the volume of the cavity 10a of the mold 10, and a foamed resin molded body having a predetermined shape is molded. The foamed resin molded body is molded so as to have a non-foamed skin layer as a surface layer and a foamed layer in which foaming of the foamable resin is promoted inside the skin layer. And in the cooling process of the said foaming resin molding, the pin-shaped member 80 is rotated with respect to the movable mold | type 16, and the said foaming resin molding is manufactured.

  FIG. 13 is a view showing a main part of the foamed resin molded body manufactured in the manufacturing apparatus according to the third embodiment, and FIG. 13 (a) shows the foamed resin molded part in which a part of the skin layer is opened. Sectional drawing which shows the principal part of a body, FIG.13 (b) is a front view which shows the principal part of the foaming resin molding seen from the arrow V5 direction in Fig.13 (a).

  After the foamed resin molded body is molded, as shown in FIG. 11, the pin-shaped member 80 is rotated 360 degrees or more in the direction indicated by the arrow R1 with respect to the central axis C1, thereby FIG. 13 (a) and FIG. As shown in FIG. 13B, the foamed resin molded body 90 is formed with a conical opening 90 a by the blade 85 of the pin-shaped member 80.

  Since the blade portion 85 is provided so as to protrude into the cavity 10a by a thickness equal to or greater than the thickness of the skin layer 92 of the foamed resin molded body 90 located in the vicinity of the pin-shaped member 80, the opening 90a is formed in the foamed resin molded body 90. In the foamed resin molded body 90, a part of the skin layer 92 is opened to expose the foamed layer 93.

  As described above, also in the present embodiment, the foamed resin molded body 90 having the skin layer 92 and the foamed layer 93 is formed by filling the cavity 10a of the mold 10 with the foamable resin 31 and then forming the foamed resin molded body 90. In the cooling process, the pin-shaped member 80 that is rotatably inserted into the mold 10 and has the blade portion 85 is rotated to open a part of the skin layer 92 and expose the foam layer 93, thereby forming the skin layer. The foam layer 93 is exposed by opening a part of the skin layer 92 of the foamed resin molded body 90 while suppressing the strength of the foamed resin molded body 90 from being reduced by a relatively simple method. Can be made.

  FIG. 14 is a cross-sectional view showing a modification of the blade portion of the pin-like member used in the molding die according to the third embodiment. In FIG. 14, the cross-section shown in FIG. It shows in the cross section corresponding to. As shown in FIG. 14A, as the blade portion 85 of the pin-shaped member 80 used in the mold according to the third embodiment, the end surface 85a on the front side in the rotational direction is a sharp edge and has a triangular cross section. As shown in FIG. 14B, the end face 85a on the front side in the rotational direction has a sharp edge and is formed in a trapezoidal cross section, and the end face 85a protrudes toward the cavity 10a. As shown in FIG. 14C, the end face 85a on the front side in the rotational direction has a sharp edge and is formed in a triangular shape, and the end face 85a faces the cavity 10a. What is formed so as to protrude can be used. As shown in FIGS. 14 (b) and 14 (c), as the blade portion 85, when the end surface 85a is formed so as to protrude toward the cavity 10a, the end surface on the cavity side of the blade portion 85 is used. The skin layer formed on the surface of 85c can also be easily removed.

  Even when the pin-shaped members 60 and 80 according to the second and third embodiments are used, the pin-shaped members 60 and 80 are made of a material having a lower thermal conductivity than the other parts of the mold 10. A sheet member may be inserted, or the cavity side of the cylindrical portion 61 may be formed by the sheet member. The pin-like members 60 and 80 can also serve as ejector pins for releasing the foamed resin molded bodies 70 and 90 from the mold 10.

  The present invention is not limited to the illustrated embodiments, and it goes without saying that various improvements and design changes can be made without departing from the gist of the present invention.

  As described above, according to the present invention, it becomes possible to open a part of the skin layer and expose the foamed layer while suppressing the strength reduction of the foamed resin molded article. There is a possibility that it is preferably used.

11, 111 Fixed mold 16, 121 Movable mold 10, 110 Mold 31, 31 Foamed resin 10a, 110a Cavity 42, 72, 92, 102 Skin layer 43, 73, 93, 103 Foam layer 40, 70, 90, 100 Foamed resin molded body 25, 65, 85 Blade portion 20, 60, 80 Pin-shaped member C1 Center shaft 62 Cylindrical portion 61a Air supply hole 30 Injection device M Manufacturing device

Claims (8)

Using a pair of molds consisting of a fixed mold and a movable mold, and filling the cavity of the mold with a foamed resin in a molten state, a skin layer as a surface layer and a foam layer provided inside the skin layer, After forming a foamed resin molded body having the following, a method for producing a foamed resin molded body in which a part of the skin layer is opened to expose the foamed layer,
After the foamed resin is filled in the mold cavity and the foamed resin molded body having a skin layer and a foamed layer is molded, the mold is inserted into the mold in a rotatable manner in the cooling process of the foamed resin molded body. And rotating a pin-like member having a blade portion for opening a part of the skin layer at the front end of the cavity side to open a part of the skin layer to expose the foam layer. ,
A method for producing a foamed resin molded product. The pin-like member is formed such that the blade portion with the circular columnar also be formed in a circular cylindrical shape extending to project the central axis and a flat row of said pin-like member at an outer peripheral side of the pin-like member ,
The manufacturing method of the foamed resin molding of Claim 1 characterized by the above-mentioned. The pin-like member has a cylindrical portion formed in a circular cylindrical shape at the tip of the cavity-side,
The blade portion is provided so as to extend in the central axis direction of the pin-shaped member from the cavity side of the cylindrical portion.
The manufacturing method of the foamed resin molding of Claim 1 characterized by the above-mentioned. The blade portion is provided so as to protrude from the cavity surface of the molding die into the cavity at least the thickness of the skin layer of the foamed resin molding,
The manufacturing method of the foaming resin molding of Claim 3 characterized by the above-mentioned. The pin-shaped member has an air supply hole for ejecting air from the tip on the cavity side inside the pin-shaped member,
When releasing the foamed resin molded body from the mold, air was jetted through the air supply hole to the blade portion.
The method for producing a foamed resin molded article according to claim 3 or 4, characterized in that The pin-shaped member also serves as an ejector pin for releasing the foamed resin molded body from the mold.
The method for producing a foamed resin molded article according to any one of claims 1 to 5, wherein: The molding die is configured to make the skin layer of the foamed resin molded body located in the vicinity of the pin-shaped member thinner than the other part of the skin layer of the foamed resin molded body when molding the foamed resin molded body. Configured to,
The method for producing a foamed resin molded article according to any one of claims 1 to 6, wherein the foamed resin molded article is provided. A pair of molds composed of a fixed mold and a movable mold, and injection means for injecting a molten foamable resin into the cavity of the mold, and by injecting a molten foamable resin into the cavity After forming a foamed resin molded article having a skin layer as a surface layer and a foamed layer provided inside the skin layer, a part of the skin layer is opened to expose the foamed layer. Manufacturing equipment,
A pin-like member that is rotatably inserted into the mold and has a blade portion for opening a part of the skin layer at a tip portion on the cavity side;
A rotation driving means for rotating the pin-shaped member;
Rotation control means for controlling the operation of the rotation drive means;
Have
The rotation control unit forms the foamed resin molded body having a skin layer and a foamed layer by injecting the foamable resin into the cavity, and then, in the cooling process of the foamed resin molded body, Rotating and controlling the operation of the rotation driving means so as to expose the foamed layer by opening a part of the skin layer by the blade portion;
An apparatus for producing a foamed resin molded product.

Images