JP2017100448A - Foam molded body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a foam molded body capable of suppressing the generation of foam burr.SOLUTION: Provided is a foam molded body 10 comprising: a body part 11 provided with a foam layer 13 and a skin layer 14 covering the foam layer 13 and having a design face 11A and an opposite face 11B; and a bulging part 12 provided at the peripheral part 11C of the body part 11 and bulging to a side opposite to the design face 11A at a thickness direction T of the body part 11, and the thickness T1 of a region 40 between the body part 11 and the bulging part 12 is thinner than the thickness T2 of the body part 11 and the thickness T3 of the bulging part 12.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a foam molded article.

  Since resin structures are lighter than metals, they are widely used as structural parts for vehicles, on-vehicle accessories, casings for electronic devices, and the like. Among the resin structures, foamed molded products are particularly lightweight, and if used for vehicle parts such as automobiles, improvement in fuel consumption is expected.

  For example, a method described in Patent Document 1 is known as an injection foam molding method of a foam molded body used as an automobile interior base material or the like. In this publication, molten resin is injected into cavities formed in a pair of molding dies, and foaming is performed.

JP 2005-238726 A

  When the molten resin is injected into the cavity, the portion in contact with the molding die is cooled and solidified to form a film-like skin layer. In this state, when the movable mold is core-backed with respect to the fixed mold to expand the volume in the cavity, the molten resin covered with the skin layer foams to form a foamed layer, and a foamed molded product is manufactured.

Here, for example, when the joint between the fixed mold and the movable mold is located at a portion other than the end portion of the cavity, if the molten resin is foamed by core-backing the movable mold, the mating surface of the fixed mold of the skin layer and the movable mold are aligned. The foaming pressure may concentrate on the portion corresponding to the gap between the surface and a tear may occur in the skin layer. When a tear occurs in the skin layer, the molten resin flowing out from the tear flows into the gap between the fixed-type mating surface and the movable-type mating surface, and a foam burr is formed. The foam burrs need to be removed from the foamed molded product. In addition, there is a concern about the appearance defects such as voids after painting on the part from which the foam burrs have been removed.
Then, this invention provides the foaming molding which can suppress generation | occurrence | production of a foaming burr | flash.

The present invention has been made in view of the above problems, and includes the following embodiments.
<1> A main body having a foam layer and a skin layer covering the foam layer, the main body having a design surface and an opposite surface, and provided at a peripheral edge of the main body, and the design in the thickness direction of the main body A foamed part having a projecting part projecting to the opposite side of the surface, wherein a thickness of a region between the main body part and the projecting part is thinner than a thickness of the main body part and a thickness of the projecting part body.

<2> The foam molded article according to <1>, wherein the thinnest portion of the region has a skin layer ratio of 80% by volume or more.

<3> The foamed molded product according to <1> or <2>, wherein the thickness of the thinnest portion in the region is 1.5 mm or less.

<4> A fixed-side mold, and a movable-side mold that is movable in the opening / closing direction with respect to the fixed-side mold and forms a cavity that is a gap between the fixed-side mold, A mold having a narrow interval in the cavity, and a joint between the fixed mold and the movable mold is located in the narrow section.

<5> The cavity corresponds to the shape of the foam molded body according to any one of <1> to <3>, and a narrow portion of the cavity includes a main body portion and an overhang portion of the foam molded body. The metal mold | die as described in <4> corresponding to the area | region between.

<6> A step of injecting a resin material containing a foaming agent into the cavity of the mold according to <5>, and after filling the cavity with the resin material, the fixed side mold constituting the mold And a step of moving the movable mold in the opening direction to expand the volume in the cavity.

<7> The method for producing a foamed molded article according to <6>, wherein the foaming agent is an organic foaming agent.

<8> The method for producing a foam molded article according to <7>, wherein the organic foaming agent contains azodicarbonamide.

<9> The method for producing a foamed molded article according to <8>, wherein the content of the azodicarbonamide in the resin material is 0.05% by mass to 0.5% by mass.

<10> The resin material is a polyethylene resin, a polypropylene resin (PP), a composite polypropylene resin (PPC), a polystyrene resin, a polyethylene terephthalate resin, a polyvinyl alcohol resin, a vinyl chloride resin, an ionomer resin, The foam molded article according to any one of <6> to <9>, comprising at least one selected from the group consisting of a polyamide resin, an acrylonitrile / butadiene / styrene copolymer resin (ABS), and a polycarbonate resin. Manufacturing method.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the foaming molding which can suppress generation | occurrence | production of a foaming burr | flash.

It is a rear view of the foaming molding of this embodiment. It is a longitudinal cross-sectional view (2-2 sectional view taken on the line in FIG. 1) of the foaming molding of FIG. FIG. 3 is an enlarged view of a portion indicated by an arrow 3 in FIG. 2. It is a schematic sectional drawing of a metal mold | die. FIG. 5 is an enlarged view of a portion indicated by an arrow 5 in FIG. 4. FIG. 5 is an enlarged view of a portion indicated by an arrow 5 in FIG. 4 after the core back. It is a longitudinal cross-sectional view (sectional view corresponding to the 2-2 line cross section in FIG. 1) of the modification of the foaming molding of this embodiment. FIG. 8 is an enlarged view of a portion indicated by an arrow 8 in FIG. 7. It is a schematic sectional drawing of the modification of a metal mold | die. FIG. 10 is an enlarged view of a portion indicated by an arrow 10 in FIG. 9.

  Hereinafter, embodiments for carrying out the present invention will be described in detail. However, the present invention is not limited to the following embodiments. In the following embodiments, the components (including element steps and the like) are not essential unless otherwise specified. The same applies to numerical values and ranges thereof, and the present invention is not limited thereto.

  In this specification, the term “process” includes a process that is independent of other processes and includes the process if the purpose of the process is achieved even if it cannot be clearly distinguished from the other processes. It is.

In the present specification, the numerical ranges indicated by using “to” include numerical values described before and after “to” as the minimum value and the maximum value, respectively.
In the numerical ranges described stepwise in this specification, the upper limit value or the lower limit value described in one numerical range may be replaced with the upper limit value or the lower limit value of another numerical range. Good. Further, in the numerical ranges described in this specification, the upper limit value or the lower limit value of the numerical range may be replaced with the values shown in the examples.
In the present specification, the content of each component in the composition is the sum of the plurality of substances present in the composition unless there is a specific indication when there are a plurality of substances corresponding to each component in the composition. It means the content rate of.

In this specification, the term “layer” refers to the case where the layer is formed only in a part of the region in addition to the case where the layer is formed over the entire region. Is also included.
In this specification, the “layer thickness” is an arithmetic average value obtained by measuring the thickness of nine points using a microscope in a cross-sectional cut shape.

<Foamed molded product>
The foam molded body of the present embodiment includes a foam layer and a skin layer that covers the foam layer, and is provided on a main body portion having a design surface and an opposite surface; and a peripheral edge portion of the main body portion; A thickness of the region between the main body portion and the overhanging portion is the thickness of the main body portion and the thickness of the overhanging portion. Thinner than. Although the specific example of a foaming molding is demonstrated, referring drawings, this invention is not limited to this. Moreover, the size of each part in each figure is conceptual, and the relative relationship of the size between each part is not limited to this.
The foamed molded product of this embodiment can be used as an automotive part. However, the use of the foamed molded product is not limited to automotive parts.

  The foamed molded body 10 of the present embodiment is an automotive part and is attached to the vehicle body 30 (see FIG. 2). Examples of automobile parts include bumpers, side mudguards, and fenders.

As shown in FIG. 2, the foam molded body 10 is made of a resin material, and is provided on the main body portion 11 having the design surface 11 </ b> A and the opposite surface 11 </ b> B, and the peripheral portion 11 </ b> C of the main body portion 11. A projecting portion 12 projecting to the opposite side of the design surface 11A in the thickness direction (direction indicated by arrow T in FIG. 2), and the thickness T1 of the region 40 between the main body portion 11 and the projecting portion 12 Is made thinner than the thickness T2 of the main body 11 and the thickness T3 of the overhanging portion 12. Hereinafter, a portion corresponding to the region 40 of the foam molded body 10 is appropriately referred to as a thin portion 40.
The thickness T1 of the thin portion 40 is a thickness measured in a direction orthogonal to the outer surface (surface) of the thin portion 40 in the cross section along the protruding direction of the protruding portion 12, and the thickness T2 of the main body portion 11 is The thickness T3 of the overhang portion 12 is a thickness measured in a direction perpendicular to the overhang direction in the cross section along the overhang direction of the overhang portion 12. . In the present specification, the “thickness” of each part of the foam molded article is an arithmetic average value obtained by, for example, measuring the thickness at nine points using a measuring instrument (caliper gauge).

  The main body 11 has a plate shape, and a plurality of vehicle body attachment portions 11D (see FIG. 1) are formed on the opposite surface 11B. The vehicle body attachment portion 11D is a portion for attaching the main body portion 11 (foamed molded body 10) to the vehicle body 30 using an attachment member (not shown).

  As shown in FIGS. 1 and 2, the overhanging portion 12 has a plate shape and is provided on the entire peripheral edge portion 11 </ b> C of the main body portion 11. That is, the overhang portion 12 of the present embodiment is provided for one turn along the peripheral edge portion 11 </ b> C of the main body portion 11. In addition, this invention is not limited to the said structure, The structure by which the overhang | projection part 12 is provided intermittently along the peripheral part 11C of the main-body part 11 may be sufficient.

  As shown in FIG. 2, the overhanging portion 12 is inclined with respect to the thickness direction of the main body portion 11 toward the outside of the main body portion 11 (outside of the main body portion 11 in a direction orthogonal to the thickness direction of the main body portion 11). doing. With this configuration, the foamed molded body 10 can be easily removed from the fixed mold 17.

  As shown in FIG. 3, the foam molded body 10 includes a foam layer 13 and a skin layer 14 that covers the foam layer 13 and forms the surface layer of the foam molded body 10. Here, the “skin layer” refers to a portion that forms the surface layer of the foam molded body 10 and has a lower foaming rate than the foam layer 13.

  The thickness of the thinnest portion 40 in the thinnest portion is thinner than the thickness T2 of the main body portion 11 and the thickness T3 of the overhang portion 12, and is thicker than the thickness LT of the skin layer 14 on the design surface 11A side of the main body portion 11. ing. By setting it as such a structure, compared with the main-body part 11, in the thin part 40, the ratio of the skin layer 14 increases. For this reason, it is located in the gap 23 between the mating surface of the fixed mold 17 and the mating surface of the movable mold 19 during manufacturing (core back), which will be described later, and foams into the skin layer 14 that becomes the thin portion 40. The generation of tears due to pressure is suppressed. In particular, by making the thickness of the thinnest portion 40 the thickness of the thinnest portion 2.5 or less than the thickness LT, the ratio of the skin layer 14 is further increased, and the thinned portion 40 is obtained during manufacturing (core back). It is further suppressed that a tear is generated in the skin layer 14 due to foaming pressure. Thereby, generation | occurrence | production of a foaming burr | flash on the foaming molding 10 is suppressed.

Further, from the viewpoint of suppressing the occurrence of foam burrs in the foam molded body 10, the ratio of the skin layer 14 of the thin portion 40 is preferably 80% by volume or more, and more preferably 90% by volume or more. More preferably, it is 100 volume%. When the ratio of the skin layer 14 in the thin portion 40 is 100% by volume, the entire thin portion 40 is formed only by the skin layer 14. Moreover, the structure by which the thinnest part of the thin part 40 is formed only with the skin layer 14 may be sufficient.
Since the thinnest portion 40 is formed by only the skin layer 14 at least at the thinnest portion 40, the skin layer 14 that becomes the thin-walled portion 40 may have a tear due to foaming pressure during manufacturing (core back) described later. Effectively suppressed. Thereby, generation | occurrence | production of a foaming burr | flash in the foaming molding 10 is suppressed effectively.

  Furthermore, from the viewpoint of suppressing the occurrence of foam burrs in the foam molded body 10, the thickness of the thinnest portion 40 is preferably 1.5 mm or less, and preferably 1.2 mm or less. Is more preferable, and it is still more preferable that it is 1.0 mm or less.

  The resin material forming the foamed molded body 10 of this embodiment will be described later.

<Mold>
The mold for molding the foamed molded product of the present embodiment is a fixed mold, a fixed mold, and movable in an opening / closing direction with respect to the fixed mold, and the fixed mold A movable-side mold that forms a cavity that is a gap between the cavity and the cavity, a portion having a narrow interval is formed, and a joint between the fixed-side mold and the movable-side mold is formed in the narrow portion. Is located. Although the specific example of a metal mold | die is demonstrated referring drawings, this invention is not limited to this. Moreover, the magnitude | size of the member in each figure is notional, The relative relationship of the magnitude | size between members is not limited to this. The mold can be used for injection molding, can be suitably used for foam molding, and can be more suitably used for injection foam formation. However, it is not limited to these uses. Hereinafter, injection foam molding will be described as an example.

  As shown in FIG. 4, the molding apparatus 16 is movable in the opening / closing direction with respect to the stationary mold 17 and the stationary mold 17, and a cavity 18 that is a gap between the molding apparatus 16 and the stationary mold 17. And a movable mold 19 for forming the. Hereinafter, the fixed mold 17 and the movable mold 19 may be collectively referred to as “mold 15”.

  The cavity 18 is formed with a portion having a narrower interval than other portions. This narrow portion is appropriately referred to as a cavity middle portion 18A. A seam 20 between the fixed mold 17 and the movable mold 19 is located in the cavity middle portion 18A. The seam 20 is located in the cavity intermediate portion 18A at a portion where the thin portion 40 between the main body portion 11 and the overhang portion 12 of the foam molded body 10 is molded. In the closed state of the fixed side mold 17 and the movable side mold 19, the interval W 1 between the narrowest portions of the cavity intermediate portion 18 A is equal to the interval W 2 between the portions corresponding to the main body portion 11 of the cavity 18 and the tension of the cavity 18. It is narrower than the interval W3 of the part corresponding to the protruding part 12. In addition, it is preferable that the space | interval W1 is 1.5 mm or less, It is more preferable that it is 1.2 mm or less, It is further more preferable that it is 1.0 mm or less. With this configuration, foaming of the resin material filled in the cavity intermediate portion 18A can be effectively suppressed, and the ratio of the skin layer 14 in the cavity intermediate portion 18A can be increased.

  The cavity 18 corresponds to the shape of the foam molded body 10, and the cavity intermediate portion 18 </ b> A corresponds to a region (thin wall portion) 40 between the main body portion 11 and the overhang portion 12 of the foam molded body 10. .

  In the present embodiment, the cavity surface 17A formed on the fixed mold 17 forms the back surface (including the thin portion 40) of the foam molded body 10 and the surface (external surface) of the overhang portion 12 so that the movable side mold A surface of the main body 11 (a surface including the design surface 11A) is formed by the cavity surface 19A formed in the mold 19. The cavity 18 is a gap between the cavity surface 17A and the cavity surface 19A in a state where the fixed side mold 17 and the movable side mold 19 are closed.

  In addition, the fixed mold 17 has a plurality of slide block parts 17 </ b> B that can slide in a direction orthogonal to the moving direction of the movable mold 19 at a portion that forms a mating surface with the movable mold 19. The inner surface of the slide block portion 17B is a part of the cavity surface 17A, and the surface (outer surface) of the overhang portion 12 is formed. The slide block portion 17 </ b> B moves to the outer peripheral side of the fixed mold 17 when the foamed molded body 10 is taken out from the fixed mold 17. For this reason, it is easy to take out the foamed molded body 10 from the fixed mold 17.

  The molding apparatus 16 includes a gate 21 that penetrates the fixed mold 17 up to the cavity 18 and an injection machine 22 that injects and fills the molten resin material R into the cavity 18 through the gate 21. The injection machine 22 includes a hopper (supply unit) (not shown) and a cylinder (not shown). In this injection machine 22, a mixture containing a resin, a foaming agent, an additive, and the like is supplied from a hopper (supply unit) to a cylinder, and is stirred as a resin material R in the cylinder with a screw or the like, and is prepared at a predetermined pressure. Then, the resin material R is injected and filled into the cavity 18 through the gate 21. The injector 22 is not limited to the above configuration as long as the molten resin material R can be injected and filled into the cavity 18 through the gate 21.

<Method for producing foam molded article>
The method for producing a foamed molded product for producing the foamed molded product of the present embodiment includes a step of injecting a resin material containing a foaming agent into the cavity of the mold, and after filling the cavity with the resin material And a step of expanding a volume in the cavity by moving a movable side mold in an opening direction from a fixed side mold constituting the mold.

  As shown in FIG. 4, the resin material R containing the foaming agent is injected and filled into the cavity 18 from the injection machine 22 through the gate 21. When the resin material R is composed of a thermoplastic resin, the resin material R is heated and fluidized and supplied into the cavity 18.

  Here, it is preferable to set the cylinder temperature in the region from the hopper outlet of the injection machine 22 of the resin material R to 1/3 to 1/2 of the entire cylinder length to 250 ° C. or less, and more preferably to 180 ° C. or less. Preferably, it is set to 150 to 180 ° C, more preferably 150 to 170 ° C. However, the said area | region is temperature except a hopper exit. By setting the cylinder temperature in the region to 250 ° C. or less, it is possible to suppress the escape of foaming gas from the hopper outlet side, and it is easy to obtain effects such as improvement in foaming and stabilization during molding.

  The resin material used in the present embodiment is not particularly limited. For example, a resin material used for injection foam molding generally contains a resin and a foaming agent. The resin used for the resin material R is polyethylene resin, polypropylene resin (PP), composite polypropylene resin (PPC), polystyrene resin, polyethylene terephthalate resin, polyvinyl alcohol resin, vinyl chloride resin, ionomer resin. Examples thereof include at least one selected from the group consisting of a resin, a polyamide resin, an acrylonitrile / butadiene / styrene copolymer resin (ABS), and a polycarbonate resin. Among these, at least one selected from the group consisting of polypropylene resin (PP), composite polypropylene resin (PPC), and acrylonitrile / butadiene / styrene copolymer resin (ABS) is preferable.

  Examples of the foaming agent include organic foaming agents such as azodicarbonamide and inorganic foaming agents such as sodium hydrogen carbonate (also known as sodium bicarbonate and sodium bicarbonate). At present, in foam molding of automotive interior parts, inorganic sodium hydrogen carbonate is mainly used as a foaming agent, but an organic foaming agent is preferable from the viewpoint of improving coating film performance (warm water resistance, etc.). .

Examples of the organic foaming agent include azodicarbonamide (ADCA), N, N-dinitrosopentamethylenetetramine (DPT), 4,4-oxybisbenzenesulfonylhydrazide (OBSH), hydrazodicarbonamide (HDCA), and the like. Azodicarbonamide (ADCA) is preferred. In particular, when manufacturing an exterior coating product, it is preferable to use azodicarbonamide (ADCA).
By using azodicarbonamide (ADCA), hot water resistance and the like are improved, and the occurrence of swirl in the hot water test tends to be suppressed. The swirl is a defect that gas generated by the reaction between the unreacted foaming agent remaining in the skin layer and water pushes up the skin layer.

  The content of azodicarbonamide (ADCA) in the total amount of the blowing agent is preferably 50% by mass or more, more preferably 80% by mass or more, further preferably 90% by mass or more, and 95 It is particularly preferable that the content is at least mass%.

  The decomposition temperature of the blowing agent is preferably 50 ° C to 250 ° C, and more preferably 50 ° C to 220 ° C. Depending on the form of use, the decomposition temperature of the foaming agent may be 130 ° C to 250 ° C.

  The content of the foaming agent in the resin material is preferably set as appropriate according to the type of foaming agent. For example, when azodicarbonamide (ADCA) is used as the foaming agent, the content of azodicarbonamide (ADCA) in the resin material R is 0.05% by mass to from the viewpoint of foamability, moldability, and coating film performance. It is preferably in the range of 0.5% by mass, and more preferably in the range of 0.1% by mass to 0.4% by mass. In addition, the content rate of ADCA means the ratio in the mixture (composition) before throwing in the cylinder of an injection device.

  The gas generated from the resin material R when the resin material R is injected and filled into the cavity 18 is preferably sucked under reduced pressure by a vacuum pump or the like. Thereby, when the resin material R is filled, an excessive increase in the resin pressure can be suppressed and the injection speed can be stably maintained. As a result, the foaming reaction is suppressed in the step of injecting and filling the resin material R, and the generated gas can be quickly discharged during the foaming reaction, so that gas accumulation, foaming failure, etc. can be avoided. There exists a tendency for the generation | occurrence | production of the dent (avatar) of the surface of the molded object 10 to be suppressed.

  The mold 15 is usually at a lower temperature than the resin material R to be supplied. Therefore, when the resin material R is filled into the cavity 18, solidification of the resin material R (formation of the skin layer 14) starts from the portion in contact with the mold. Here, in this embodiment, the interval W1 of the narrowest portion of the cavity middle portion 18A of the cavity 18 is set to be narrower than the interval W2 and the interval W3, specifically, set to 1 mm or less. Accordingly, the resin material R in the cavity intermediate portion 18A is all solidified to become the skin layer 14.

  In addition, before injecting the resin material R into the cavity 18, it is preferable that nitrogen gas is filled in the cavity 18 in advance, in particular, heated and filled. By heating the nitrogen gas to be filled, a rapid temperature drop in the cavity 18 (mold) can be suppressed, and the foamability of the resin material R can be stabilized. Further, by heating the nitrogen gas to be filled, the foaming force of the resin material R is suppressed from the dependence on the outside temperature without being influenced by the outside temperature, and the foaming property of the resin material R can be stabilized.

  The temperature of the nitrogen gas filled in the cavity 18 is not particularly limited as long as it is a temperature at which a rapid temperature drop in the cavity 18 (mold 15) can be suppressed. From the viewpoint of molding stability, the temperature is from 30 ° C to 50 ° C. It is preferable that it is ° C.

  Further, it is preferable that the nitrogen gas previously filled in the cavity 18 is sucked under reduced pressure immediately before the injection filling of the resin material R. Before filling the cavity 18 with the resin material R, the nitrogen gas in the cavity 18 is sucked under reduced pressure, so that the injection filling time of the resin material R can be shortened, and the surface of the foam molded body 10 is recessed. Generation of (avatar) can be suppressed. As a method of sucking the nitrogen gas in the cavity 18 under reduced pressure, a method of sucking with a vacuum pump can be mentioned.

  Then, as shown in FIGS. 5 and 6, the movable mold 19 is opened by a predetermined amount (core back) in the opening direction (mold opening direction) with respect to the fixed mold 17, and the resin material R that has not solidified. To form a foamed layer 13. Thereafter, the fixed mold 17 and the movable mold 19 are opened, and the foam block 10 is removed from the fixed mold 17 by sliding the slide block portion 17B of the fixed mold 17 to remove the foam mold 10. 10 is obtained.

Here, since the interval W1 of the cavity intermediate portion 18A of the cavity 18 is set to 1 mm or less, all of the resin material R filled in the cavity intermediate portion 18A is solidified to form the skin layer 14. Therefore, as shown in FIG. 6, when the movable mold 19 is core-backed (moved from the mold closing position in FIG. 5 to the foaming position in FIG. 6), the mating surface of the fixed mold 17 and the movable mold In the gap 23 between the mating surfaces of the mold 19, a portion formed only by the skin layer 14 that becomes the thin portion 40 is located. Since the foaming pressure hardly acts on this portion, the formation of a tear in the skin layer 14 is suppressed. As a result, the resin material R that has not solidified flows into the gap 23, thereby preventing foaming burrs from being generated between the main body part 11 and the overhanging part 12 of the produced foamed molded body 10.
That is, the foam molded body 10 is shaped such that the thickness T1 of the region 40 between the main body portion 11 and the overhang portion 12 is thinner than the thickness T2 of the main body portion 11 and the thickness T3 of the overhang portion 12. Thus, as described above, generation of foam burrs in the foamed molded article 10 after manufacture is suppressed. In particular, by forming the thinnest portion of the region (thin wall portion) 40 only by the skin layer 14, it is possible to effectively suppress the occurrence of foam burrs in the foamed molded body 10 after manufacture.

  In this embodiment, although the overhang | projection part 12 is set as the structure inclined toward the outer side of the main-body part 11 with respect to the thickness direction of the main-body part 11, this invention is not limited to this structure. For example, a configuration in which the overhanging portion 12 is inclined toward the inside of the main body portion 11 with respect to the thickness direction of the main body portion 11 as in the foamed molded body 50 shown in FIGS. In this case, the overhanging portion 12 of the foam molded body 50 has an undercut shape, but the foam molded body 50 can be taken out from the mold 15 by forcibly removing it. On the other hand, the foamed molded product 50 can be smoothly taken out by using the mold 52 shown in FIGS. The mold 52 includes a fixed-side mold 54 on which a cavity surface 54A for molding the surface (including the design surface 11A) of the main body portion 11 of the foam molded body 50 is formed, and a back surface (thin wall portion 40) of the foam molded body 50. And a movable mold 56 formed with a cavity surface 56A for molding the surface (outer surface) of the overhanging portion 12, and a cavity 55 (cavity intermediate portion) between the cavity surface 54A and the cavity surface 56A. 55A) is formed. The movable mold 56 is formed with a plurality of inclined slide block sections 56 </ b> B in which a portion forming the back surface of the overhanging portion 12 can slide in a direction orthogonal to the moving direction of the movable mold 56. The inclined slide block portion 56B is configured to move to the inside of the movable mold 56 and move away from the back surface of the overhang portion 12 when the movable mold 56 is moved in the mold opening direction. When the foamed molded body 50 is taken out from the movable side mold 56, the inclined slide block portion 56B has moved to a position where it does not come into contact with the overhanging portion 12. Therefore, the foamed molded body 50 is smoothly removed from the movable side mold 56. Can be taken out. The foamed molded product 50 is taken out of the fixed mold 54 by an unillustrated eject pin provided on the fixed mold 54.

  The present invention is not limited to the specific configuration of the embodiment as described above, and can be variously modified without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 Foam molded object 11 Main body part 11A Design surface 11B Opposite surface 11C Peripheral part 12 Overhang part 13 Foam layer 14 Skin layer 40 Area | region between main body part and overhang part 50 Foam molded object T Thickness direction of main body part T1 Main body Thickness of the region between the part and the overhang part

Claims (3)

A foam layer and a skin layer covering the foam layer;
A main body having a design surface and an opposite surface;
An overhang portion provided on a peripheral edge of the main body portion and projecting to the opposite side of the design surface in the thickness direction of the main body portion;
A foamed molded article, wherein a thickness of a region between the main body portion and the overhang portion is thinner than a thickness of the main body portion and a thickness of the overhang portion.   The foam molded article according to claim 1, wherein the thinnest portion in the region has a ratio of the skin layer of 80% by volume or more. The foam molded article according to claim 1 or 2, wherein the thickness of the thinnest part in the region is 1.5 mm or less.