JP7700639B2 - Manufacturing method for vehicle interior materials - Google Patents

Description

The technology disclosed in this specification relates to a method for manufacturing interior materials for vehicles.

Conventionally, vehicle interior materials made of fibers and thermoplastic resins have been used from the viewpoint of high rigidity and light weight. Such vehicle interior materials are formed by press molding a pre-board containing fibers and thermoplastic resin with a mold. In addition, when providing such vehicle interior materials with so-called undercut portions that are concave in a direction intersecting with the mold opening direction of the mold, or protruding portions such as clip seats that protrude from the plate surface of the vehicle interior material, a manufacturing method is known in which, for example, after molding a base material with a pair of molds, a fiber-free resin is injection molded into the base material to form the undercut portions and protruding portions integrally with the base material (see Patent Documents 1 and 2).

JP 2018-176576 A JP 2010-274636 A

In vehicle interior materials that integrate parts made of different materials like this, there is a problem in that deformation occurs easily during cooling due to differences in the amount of thermal shrinkage that occurs at the boundaries between them. To prevent deformation, jigs, procedures, and equipment are required to correct the deformation. Furthermore, if the boundaries are located in a position that can be seen from the surface, it looks bad, and for design reasons, it is necessary to cover the surface with a skin material.

The technology disclosed in this specification was developed based on the above circumstances, and aims to provide a vehicle interior material that is less likely to deform, has a uniform appearance, and can be used as a decorative material, even when the vehicle interior material has an undercut portion that forms an undercut shape or a protruding portion that protrudes from the plate surface.

As a means for solving the above problems, the technology disclosed in this specification is a manufacturing method for a vehicle interior material that contains fibers and thermoplastic resin and has a plate-shaped main body and an extension portion extending from the main body, and includes a heating process for heating a pre-board containing fibers and thermoplastic resin, and a press molding process for pressing the pre-board with a molding die having a main body molding portion for molding the main body and an extension molding portion that is connected to the main body molding portion and molds the extension portion, and is characterized in that in the press molding process, the pre-board is pressed by the main body molding portion, and a part of the pre-board that has been crushed is pressed and spread into the extension molding portion to fill it.

According to the above configuration, even if the vehicle interior material has an extension portion, the main body portion and the extension portion can be made of the same material, so deformation due to the difference in the amount of thermal shrinkage is unlikely to occur at the boundary between the main body portion and the extension portion. Therefore, jigs and work for correcting deformation are not required, and the manufacturing equipment and work effort and cost can be reduced. In addition, since there is no boundary portion between the main body portion and the extension portion due to the difference in material, even if the boundary portion between the main body portion and the extension portion is located in a visible position (design surface), it is possible to use the surface of the molded vehicle interior material as it is as the design surface. In other words, the skin material can be omitted. Furthermore, since the extension portion, which was previously made only of resin, can be made of fiber and thermoplastic resin, the strength of the extension portion can be improved compared to the conventional case.

A portion of the pre-board that is disposed adjacent to the extension portion molding portion when the pre-board is press-molded into the main body portion molding portion may be a thick portion that is thicker than other portions.

According to the above configuration, when the pre-board is press-molded, the pre-board is more easily pushed out toward the extension molding section compared to a configuration in which no thick wall portion is formed. Also, it becomes easier to fill every corner of the extension section.

The thick portion may be formed thicker than other portions by making the surface of the pre-board opposite the surface that will become the design surface of the vehicle interior material protrude.

The above configuration reduces the effect of the thick portion on the design surface when the pre-board is pressed, compared to a configuration in which the thick portion protrudes toward the design surface of the vehicle interior material. In other words, it is possible to provide a more uniform and beautiful design surface.

The portion of the pre-board that is disposed adjacent to the extension portion molding portion when the pre-board is press-molded into the main body portion molding portion may be a high-density portion having a higher density of fibers and thermoplastic resin than other portions.

According to the above configuration, the density of the high-density portion is reduced and becomes close to the density of the other portions by press-molding the pre-board and expanding it into the extension molding portion. In other words, by reducing the difference in density between the main body portion and the extension portion, the difference in the amount of thermal shrinkage is reduced and the visual difference is also reduced.

The extension may have, at least in part, an undercut portion that extends in a direction intersecting the mold opening direction of the molding die and inhibits mold opening.

With the above configuration, even if the vehicle interior material has an undercut portion, the entire vehicle interior material can be made of the same material. In other words, it is possible to provide a vehicle interior material that is less prone to deformation, is visually uniform, and can be used as a design material.

The molding die has an undercut portion molding section that molds the undercut portion in at least a part of the extension portion molding section, and at least a part of the undercut portion molding section is configured with a slide die that slides in a direction intersecting with the mold opening direction, and may include a release step after the press molding step in which the molding die is opened and the slide die is slid to remove the vehicle interior material.

The above configuration makes it possible to demold vehicle interior materials having undercut portions formed by press molding.

The undercut portion may be formed on the outer peripheral edge of the main body. The undercut portion may also be formed on the upper end of an upper board that forms the lower end of a window frame of a vehicle door trim.

The undercut portion may also be formed on the tip side of a protruding portion that protrudes from the rear surface of the design surface of the vehicle interior material.

The technology disclosed in this specification makes it possible to provide vehicle interior materials that are less likely to deform, are visually uniform, and can be used as decorative materials, even when the vehicle interior materials have undercut portions that form an undercut shape or protrusions that protrude from the plate surface.

FIG. 1 is a front view showing a door trim according to a first embodiment; 1 is a cross-sectional view showing a process for forming a flat pre-board (pre-board forming process); 1 is a cross-sectional view showing a process of forming a preboard having a thick portion (preboard forming process); Cross-section of pre-board with thickened section Cross-sectional view showing the pre-board being heated (heating process) Cross-sectional view showing the pre-board placed in the open mold (press molding process) FIG. 1 is a cross-sectional view showing a state in which the mold is closed (press molding process); FIG. 11 is a cross-sectional view showing a state in which a part of the core mold is opened (removal process) FIG. 11 is a cross-sectional view showing a state in which a pre-board is placed in an open mold in the second embodiment (press molding process); FIG. 11 is a cross-sectional view showing a state in which a molding die according to another embodiment is closed (press molding process); FIG. 11 is a cross-sectional view showing a state in which a pre-board is placed in an open mold according to another embodiment.

<Embodiment 1>
A first embodiment will be described with reference to Fig. 1 to Fig. 8. In this embodiment, an upper board 12 of a trim board 11 constituting a door trim 10 for a vehicle is exemplified as an interior material for a vehicle. In the following description, the left side of Fig. 1 is the front of the vehicle, the right side is the rear of the vehicle, the upper side is the top, and the lower side is the bottom. In addition, the X direction in Fig. 6 will be described as the outside of the vehicle compartment (rear side), the direction opposite to the X direction is the inside of the vehicle compartment (front side, design surface side), the Y direction is the top, and the side opposite to the Y direction is the bottom.

As shown in FIG. 1, the door trim 10 is mainly composed of a trim board 11. The trim board 11 is divided into an upper board 12, a middle board 20, and a lower board 21, for example. The trim board 11 also has a mounting hole 22 for mounting the door inside handle, a door pocket 23, and an armrest 24.

The upper board 12 has an inner wall portion 13 that extends in a generally vertical direction along the main surface (the surface facing the occupant) of the trim board 11, and an upper wall portion 14 that extends from the upper end of the inner wall portion 13 toward the outside of the vehicle cabin. The outer edge of the upper wall portion 14 at the front end of the vehicle is concave in the direction intersecting with the mold opening direction (inside and outside the vehicle cabin, X direction) when the upper board 12 is press-molded, that is, it is an undercut portion 16 that has an inward curl.

More specifically, as shown in FIG. 7, the front end portion of the upper wall portion 14 extends diagonally upward from the upper end of the inner wall portion 13, and then has an inwardly curled shape that extends slightly diagonally downward. Hereinafter, the inner wall portion 13 and the portion of the upper board 12 that extends diagonally upward from the upper end of the inner wall portion 13 will be referred to as the board main body portion (an example of the main body portion) 15, and the inwardly curled portion that extends diagonally downward from the upper end of the board main body portion 15 will be referred to as the undercut portion (an example of the extension portion) 16. As shown in FIG. 7, the front end portion of the board main body portion 15 has a corner formed between the inner wall portion 13 and the upper wall portion 14 that forms an acute angle that protrudes toward the inside of the vehicle compartment.

The trim board 11 (upper board 12) is formed from a material containing fiber and thermoplastic resin. Examples of fibers used in the trim board 11 include wood fiber and bast plant fiber such as kenaf, but the type of fiber is not limited to these. For example, glass fiber or carbon fiber may be used as the fiber. In the trim board 11, the fibers are bound by a thermoplastic resin as a binder. Examples of the thermoplastic resin used in the trim board 11 include polyolefin resins such as polypropylene and polyethylene. The trim board 11 of this embodiment is formed from kenaf and polypropylene.

Next, the molding die 30 for molding the upper board 12 will be described. As shown in FIG. 6, the molding die 30 includes a cavity die 31 and a core die 35 (a pair of dies) arranged side by side in the horizontal direction (X direction) and facing each other. At least one of the cavity die 31 and the core die is connected to a drive device (e.g., an electric motor, an air cylinder, a hydraulic cylinder, etc.) not shown, and can be moved relatively close to or away from each other. In other words, the cavity die 31 and the core die 35 are configured to be able to be closed and opened. Note that in this embodiment, a configuration in which the opening and closing directions of the cavity die 31 and the core die 35 are horizontal is exemplified, but this is not limited thereto, and the opening and closing directions of the cavity die 31 and the core die 35 may be vertical, for example.

The core mold 35 is divided into a plurality of molds. The core mold 35 has a molding surface 36 that is shaped to follow the back surface of the upper board 12 (board body 15 and undercut portion 16). The molding surface 36 of the core mold 35, which is the surface facing the cavity mold 31, is shaped to protrude toward the cavity mold 31. At least the portion of the core mold 35 that corresponds to the back surface of the undercut portion 16 is formed by a slide mold 37A. The core mold 35 also has a molding surface 38 that is shaped to follow the surface of the undercut portion 16. In other words, the core mold 35 has a groove-shaped cavity that can mold the front and back surfaces of the undercut portion 16 with the molding surface 36 and molding surface 38. Hereinafter, this cavity is referred to as the undercut portion molding space (an example of an extension portion molding portion, an undercut portion molding portion) S2 (see FIG. 7).

On the other hand, the cavity mold 31 has a molding surface 32, which is the surface facing the core mold 35, and has a concave shape corresponding to the shape of the core mold 35. The molding surface 32 of the cavity mold 31 has a shape that imitates the part of the upper board 12 excluding the undercut portion 16, that is, the surface (design surface) of the board main body portion 15.

In the mold closed state shown in FIG. 7, a body molding space (one example of a body molding space) S1 for molding the board body 15 of the upper board 12 is formed between the cabinet mold 31 and the core mold 35. In other words, the body molding space S1 is a space surrounded by the molding surface 32 of the cabinet mold 31 and the molding surface 36 of the core mold 35. As a result, when the pre-board 12P is pressed with the cabinet mold 31 and the core mold 35, the pre-board 12P is compressed into a shape corresponding to the shape of the body molding space S1. In other words, the front surface (design surface) side of the upper board 12 is shaped by the cabinet mold 31, and the back surface side is shaped by the core mold 35, so that the board body 15 of a predetermined shape is molded. Note that the board thickness of the board body 15, i.e., the distance between the cabinet mold 31 and the core mold 35 in the mold closed state, is smaller than the board thickness of the thin wall portion 12P2 of the pre-board 12P described later.

When the cavity mold 31 and the core mold 35 are closed, the undercut portion molding space S2 of the core mold 35 described above is connected to the main body portion molding space S1. The undercut portion 16 formed by the undercut portion molding space S2 can be removed from the mold by moving the slide molds 37A and 37B in a direction intersecting the mold opening direction (X direction) when the mold is opened.

Next, a method for manufacturing the upper board 12 of this embodiment will be described. The method for manufacturing the upper board 12 of this embodiment includes a preboard forming process for forming a preboard 12P having a thick portion 12P3, a heating process for heating the preboard 12P, a press molding process for press molding the heated preboard 12P with a cavity mold 31 and a core mold 35 to form the upper board 12, and a release process for demolding the formed upper board 12.

<Pre-board forming process>
In the pre-board forming process, first, as shown in Fig. 2, a fiber mat made of fibers and thermoplastic resin is hot-pressed by a pair of flat press dies 40. As a result, the fiber mat is compressed and the thermoplastic resin contained in the fiber mat melts and mixes with each other at the contact surface. After that, the thermoplastic resin contained in the fiber mat is cooled and solidified, and a flat pre-board 12P0 is formed.

The preboard 12P of this embodiment has a thick portion 12P3 formed along the outer periphery, which is thicker than the other portions. As shown in FIG. 3, the thick portion 12P3 is formed by overlapping a preboard piece 12P1 formed of the same material and density as the preboard 12P0 on a portion of the flat preboard 12P0, and heating and bonding them together (see FIG. 4). In other words, the thick portion 12P3 protrudes from one side of the board surface of the preboard 12P. The position and dimensions of this thick portion 12P3 are appropriately adjusted to match the position and size of the undercut portion 16 of the upper board 12, as described later. The portion of the preboard 12P other than the thick portion 12P3 is referred to as the thin portion 12P2.

<Heating process>
When press-molding the upper board 12, first, the pre-board 12P is heated by the heater 45 (see FIG. 5), so that the pre-board 12P is softened.

<Press molding process>
Next, the pre-board 12P in a heated and softened state is placed between the cavity mold 31 and the core mold 35 so that its plate surface is oriented (extending in the Y direction) perpendicular to the mold closing direction (X direction) (see FIG. 6). At this time, the pre-board 12P is placed so that the protruding direction of the thick portion 12P3 from the thin portion 12P2 faces the core mold 35 (the back surface of the upper board 12). The pre-board 12P is also placed so that the thick portion 12P3 is closest to the undercut portion molding space S2.

Then, the cavity mold 31 and the core mold 35 are closed, and the pre-board 12P is press-molded by the molding surfaces 32, 36, 38 of the cavity mold 31 and the core mold 35 (see FIG. 7). As the mold is closed, the pre-board 12P is gradually folded and compressed along the molding surfaces 32, 36 from the boundary between the inner wall portion 13 and the upper wall portion 14 toward the upper end and lower end, and is molded into a shape that follows the shape of the main body molding space S1.

In addition, as the mold is closed, the thick portion 12P3 of the pre-board 12P is placed in a position in the main body molding space S1 adjacent to the undercut portion molding space S2, and the thick portion 12P3 is crushed and spread into the undercut portion molding space S2. At this time, the pre-board 12P is in a softened state, and the thick portion 12P3 provides sufficient bulk, so that it is spread and filled to every corner of the undercut portion molding space S2. The position and dimensions of the thick portion 12P3 in the pre-board 12P are adjusted in advance to match the position and size of the undercut portion 16 so that the undercut portion molding space S2 can be filled.

It is also possible to provide a heating device in the mold 30 and reheat the pre-board 12P during press molding. In such a configuration, it is possible to raise the temperature to a point where the thermoplastic resin that constitutes the pre-board 12P becomes liquid (to a point where the pre-board 12P becomes so soft that it is difficult to maintain its shape), making it easier to fill the fibers and molten thermoplastic resin into every corner of the undercut molding space S2.

The molding die 30 is then kept closed until the softened thermoplastic resin cools and solidifies.

<Removal process>
When the molded upper board 12 has cooled and the thermoplastic resin has solidified, the cavity mold 31 and the core mold 35 are opened (see FIG. 8), and the slide molds 37A and 37B are slid to remove the upper board 12 from the molding mold 30. In this manner, the upper board 12 is completed, in which the undercut portion 16 is integrally formed from the same type of material as the board body portion 15.

Next, the effects of this embodiment will be described. The manufacturing method for the upper board 12 of this embodiment includes a heating step of heating the pre-board 12P containing fibers and thermoplastic resin, and a press molding step of pressing the pre-board 12P with a molding die 30 having a main body molding space S1 for molding the board main body 15 and an undercut portion molding space S2 that is connected to the main body molding space S1 and molds the undercut portion 16. In the press molding step, the pre-board 12P is pressed into the main body molding space S1, and a part of the crushed pre-board 12P is expanded and filled into the undercut portion molding space S2.

According to the above configuration, even if the upper board 12 has an undercut portion 16 that extends in a direction intersecting the mold opening direction (X direction) of the molding die 30 and inhibits mold opening, the board body portion 15 and the undercut portion 16 can be made of the same material, so deformation due to the difference in the amount of thermal contraction is unlikely to occur at the boundary between the board body portion 15 and the undercut portion 16. Therefore, jigs and work for correcting deformation are not required, and the manufacturing equipment and work effort and cost can be reduced. In addition, since there is no boundary between the board body portion 15 and the undercut portion 16 due to the difference in material, it is possible to use the surface of the molded upper board 12 as it is as a design surface. In other words, the skin material can be omitted. Furthermore, since the undercut portion, which was previously made only of resin, can be made of fiber and thermoplastic resin, the strength of the undercut portion 16 can be improved compared to the conventional case.

The portion of the pre-board 12P that is positioned adjacent to the undercut portion molding space S2 when the pre-board 12P is press-molded into the main body portion molding space S1 is a thick portion 12P3 that is thicker than the other portions.

According to the above configuration, when the pre-board 12P is press-molded, the pre-board 12P is more easily pushed out toward the undercut molding space S2 than in a configuration in which the thick portion 12P3 is not formed. In addition, every corner of the undercut molding space S2 is more easily filled.

The thick portion 12P3 is made thicker than other portions by protruding the surface of the preboard 12P opposite the surface that serves as the design surface of the upper board 12.

With the above configuration, compared to a configuration in which the thick portion 12P3 protrudes toward the design surface of the upper board 12, the effect of the thick portion 12P3 on the design surface when the pre-board 12P is pressed can be reduced. In other words, a more uniform and beautiful design surface can be provided.

In addition, the molding die 30 is equipped with slide dies 37A and 37B that slide in a direction intersecting with the mold opening direction, and at least a portion of the undercut molding space S2 is formed by the slide die 37A. After the press molding process, the molding die 30 is opened and the slide dies 37A and 37B are slid to remove the upper board 12, and a release process is included.

The above configuration makes it possible to demold the upper board 12 having the undercut portion 16 formed by press molding.

The undercut portion 16 is formed on the outer peripheral edge of the board body portion 15. More specifically, the undercut portion 16 is formed on the upper end portion of the upper board 12 that forms the lower end portion of the window frame of the door trim 10. In this way, according to the manufacturing method of this embodiment, it is possible to manufacture an upper board 12 in which the undercut portion 16 is integrally formed from the same type of material as the board body portion 15.

<Embodiment 2>
In the above-mentioned embodiment 1, the pre-board 12P is provided with a thick portion 12P3, and the thick portion 12P3 is pressed to expand the pre-board 12P into the undercut portion molding space S2. However, in this embodiment, instead of the thick portion 12P3, a high density portion 112P5 having a higher density of fiber and thermoplastic resin than other portions is provided in a portion of the pre-board 112P that is adjacent to the undercut portion molding space S2 when the pre-board 112P is press-molded into the main body portion molding space S1. Such a high density portion 112P5 can be formed, for example, by overlapping a pre-board piece 12P1 formed of the same material and density as the pre-board 12P0 on a part of the flat pre-board 12P0 in the pre-board forming process, and hot pressing the pre-board 112P to have a uniform board thickness. The portion of the pre-board 112P other than the high density portion 112P5 is referred to as a low density portion 112P4.

When such a pre-board 112P is used, the density of the high density portion 112P5 decreases and becomes close to the density of the portion other than the high density portion 112P5 (low density portion 112P4) as the pre-board 112P is press-molded and expanded into the undercut portion molding space S2. In other words, by reducing the difference in density between the board main body portion 15 and the undercut portion 16, the difference in the amount of thermal shrinkage decreases and the visual difference also decreases.

<Other embodiments>
The technology disclosed in this specification is not limited to the embodiments described above and illustrated in the drawings, and for example, the following embodiments are also included within the technical scope.

(1) In the above embodiment, the upper board 12 constituting the door trim 10 is exemplified as an example of a vehicle interior material, but is not limited to this. The vehicle interior material may also be an instrument panel, a luggage trim, a package tray, or other vehicle interior material other than the door trim.

(2) In the above embodiment, the pre-heated pre-board 12P is placed in the mold 30 and press-molded, but the heating process and the press-molding process may be performed simultaneously, or, as described above, the pre-board may be heated again during press molding after the heating process. When heating is performed during press molding, it is possible to heat the pre-board to a temperature at which the thermoplastic resin in the pre-board has higher fluidity, making it easier for the fibers and thermoplastic resin to reach every corner of the undercut portion.

(3) In the above embodiment, an upper board 12 having an undercut portion 16 extending inward from the board main body portion 15 was disclosed, but as shown in FIG. 10, an upper board 112 having an extension portion 116 extending straight from the board main body portion 115 along the mold opening direction (X direction) can also be formed in the same manner as in the above embodiment. In other words, the pre-board 12P can be pressed into the main body portion molding space S11 formed by the cavity mold 131 and core mold 135 of the molding die 130, and a part of the crushed pre-board 12P is pushed out and filled into the extension portion molding space S12.

(4) In the above embodiment, the undercut portion 16 is provided on the outer peripheral edge of the upper board 12, but the undercut portion is not limited to this. For example, the manufacturing method disclosed in this specification can be applied to an undercut portion formed in a protrusion that protrudes from the back side of the design surface of the main body. Such a vehicle interior material can be formed, for example, as shown in FIG. 11, by press-molding the preboard 212P using a cavity mold 231 of a molding die 230 and a core mold 235 having a protrusion molding space S3 and an undercut molding space S4 that are provided in the center of the molding surface 236 and have a T-shaped cross section, and by pushing and spreading the thick portion 212P3 into the protrusion molding space S3 and the undercut molding space S4.

(5) In the above embodiment, the pre-board 12P, 112P is provided with a thick portion 12P3 or a high density portion 112P5, and the pre-board 12P, 112P is expanded into the undercut portion molding space S2, S4 by crushing the thick portion 12P3 or the high density portion 112P5. However, it is also possible to use a pre-board in which the thick portion itself is formed from a high density portion.

(6) In the above embodiment, the core mold 35, 235 is divided into multiple molds, but the manner in which the core mold is divided can be changed as appropriate. The point is that the undercut portion 16 can be removed from the mold.

10: Door trim, 11: Trim board, 12: Upper board (vehicle interior material), 12P, 112P, 212P: Pre-board, 12P3, 212P3: Thick part, 15: Board main body (main body), 16: Undercut part, 30, 130, 230: Molding mold, 31, 131, 231: Cavity mold, 32, 36, 38, 236: Molding surface, 35, 135, 235: Core mold, 37A, 37B: Slide mold, 112P4: Low density part, 112P5: High density part, S1, S11: Main body molding space (main body molding part), S2, S4: Undercut part molding space (extension part molding part, undercut part molding part), S3: Protruding part molding space (main body molding part), S12: Extension part molding space (extension part molding part)

Claims (9)

A method for manufacturing a vehicle interior material including a fiber and a thermoplastic resin, the vehicle interior material having a plate-shaped main body portion and an extension portion extending from the main body portion, the method comprising the steps of:
a heating step of heating a preboard including fibers and a thermoplastic resin;
a press molding process of pressing the pre-board with a molding die having a main body molding section that molds the main body and an extension molding section that is connected to the main body molding section and molds the extension section,
The extension portion molding portion is formed in a groove shape in one of the pair of dies of the molding die,
In the press molding step, the pre-board is pressed by the main body molding section to crush the pre-board , and a portion of the pre-board is then spread out and filled inside the extension section molding section. 2. The method for manufacturing an interior material for a vehicle according to claim 1, wherein the extension portion extends from an end portion of the main body portion, and the extension portion molding portion is formed in a groove shape capable of molding front and back surfaces of the extension portion. 3. The method for manufacturing a vehicle interior material according to claim 1, wherein a portion of the pre-board that is positioned adjacent to the extension portion molding portion when the pre-board is press-molded into the main body portion molding portion is made to be a thick portion that is thicker than other portions . 4. The method for manufacturing a vehicle interior material according to claim 3 , wherein the thick portion is formed thicker than other portions by making a surface of the pre-board opposite to a surface that is to become a design surface of the vehicle interior material protrude. 5. The method for manufacturing a vehicle interior material according to claim 1, wherein a portion of the pre-board that is positioned adjacent to the extension portion molding portion when the pre- board is press -molded into the main body portion molding portion is made into a high density portion having a higher density of fibers and thermoplastic resin than other portions. 2. The method for producing an interior material for a vehicle according to claim 1 , wherein the extension portion has, at least in a part thereof, an undercut portion that extends in a direction intersecting a mold opening direction of the forming mold and inhibits mold opening. the molding die includes an undercut portion molding portion that molds the undercut portion in at least a part of the extension portion molding portion,
At least a part of the undercut portion molding part is constituted by a slide mold which slides in a direction intersecting with a mold opening direction,
7. The method for producing a vehicle interior material according to claim 6 , further comprising, after the press molding step, a removing step of opening the molding die and sliding the slide die to remove the vehicle interior material. 8. The method for manufacturing a vehicle interior material according to claim 6 , wherein the undercut portion is formed in an upper end portion of an upper board that forms a lower end portion of a window frame of a vehicle door trim, the upper end portion being an outer peripheral edge portion of the main body portion . 8. The method for manufacturing a vehicle interior material according to claim 6 , wherein the undercut portion is formed on a tip side of the extension portion that protrudes from a rear surface of the vehicle interior material opposite to a design surface.

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