A method for preparing an exterior trim member, an exterior trim member, an automobile, and an epidermal injection mold

Abstract

The present invention discloses a method for preparing an exterior trim member, an exterior trim member, an automobile and a skin injection mold, belonging to the technical field of injection molding processes. The method includes injecting a thermosetting resin material on the surface of a foamed resin core to form an exterior trim member having a flat injection-molded resin skin, and the curing temperature of the thermosetting resin material is lower than the softening temperature of the foamed resin core. The exterior trim member includes a foamed resin core and an injection-molded resin skin. The automobile includes the exterior trim member. The skin injection mold is provided with an injection cavity, and the shape of the injection cavity matches the shape of the foamed resin core. The skin injection mold is provided with a liquid injection port for injecting the thermosetting resin material. By injecting the thermosetting resin material on the surface of the foamed resin core, an exterior trim member with a flat injection-molded resin skin can be prepared, thus solving the problems of uneven surface appearance and difficult spraying of the foamed resin member, so that the foamed resin member is expected to be extended to the application of exterior trim parts.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molding processes, and particularly to a method for preparing an exterior trim member, an exterior trim member, an automobile, and an epidermal injection mold. Background Art

[0002] EPP material (foamed polypropylene material) has good strength and stiffness and can be widely used in various structural components such as automobile sleeping berths and storage boxes. However, due to the uneven surface appearance of the components prepared from EPP materials and the difficulty in spraying, it is difficult to meet the requirements for flatness and spraying of exterior trim parts. Therefore, it is not applied to automobile exterior trim parts. The main reason for its uneven appearance is that the EPP forming process is mostly the method of steam heating and foaming, which requires many micropores to be opened on the mold surface to pass steam, resulting in protrusions and other unevenness on the surface of the formed EPP. Although the mold surface is currently textured to weaken the appearance of pores, it will form textures on the surface of the formed EPP, still unable to meet the requirements for flatness and spraying of automobile exterior trim parts. Summary of the Invention

[0003] The object of the present invention is to solve the above technical problems and provide a method for preparing an exterior trim member, an exterior trim member, an automobile, and an epidermal injection mold. By injecting a thermosetting resin material on the surface of a foamed resin core, an exterior trim member with a flat injection resin epidermis can be prepared, thus solving the problems of uneven surface appearance and difficulty in spraying of the foamed resin member, so that the foamed resin member is expected to be extended to the application of exterior trim parts. At the same time, the curing temperature of the thermosetting resin material used for the injection resin epidermis is lower than the softening temperature of the foamed resin core, which can ensure the stable material properties of the foamed resin core at this temperature during hot injection molding and will not show a softening phenomenon, having broad application prospects and commercial value.

[0004] To achieve the above object, the present invention provides the following solution: The present invention discloses a method for preparing an exterior trim member, including the following steps:

[0005] Inject a thermosetting resin material on the surface of a foamed resin core to form an exterior trim member with a flat injection resin epidermis, and the curing temperature of the thermosetting resin material is lower than the softening temperature of the foamed resin core.

[0006] Preferably, it further includes the following steps: removing the corner burrs of the injection resin epidermis, and cleaning and repairing the injection resin epidermis.

[0007] Preferably, it further includes the following steps: preparing a foamed resin core, and injecting a foamed resin material into an inner core injection mold to obtain the foamed resin core.

[0008] Preferably, during the preparation of the injection-molded resin skin, the skin injection mold is preheated first, the foamed resin core is placed in the skin injection mold and the mold is closed, a liquid thermosetting resin material is injected from the liquid injection port of the skin injection mold, and after the liquid is filled, pressure is maintained. After maintaining pressure for a preset time, demolding is performed to obtain the exterior trim member.

[0009] Preferably, the foamed resin core is an EPP core, and the injection-molded resin skin is a PDCPD skin; when preheating, the skin injection mold is preheated to 50°C to 80°C. The liquid injection port of the skin injection mold is used to inject a mixture of liquid A and liquid B. Liquid A includes DCPD and an activator, and liquid B includes DCPD and a catalyst. After the liquid is filled, pressure is maintained for 3 min to 5 min, and demolding is performed to obtain the exterior trim member.

[0010] An exterior trim member is also disclosed, which includes a foamed resin core and an injection-molded resin skin injection-molded on the surface of the foamed resin core. The injection-molded resin skin is injection-molded with a thermosetting resin material whose curing temperature is lower than the softening temperature of the foamed resin core.

[0011] Preferably, the foamed resin core is an EPP core, and the injection-molded resin skin is a PDCPD skin.

[0012] Preferably, the exterior trim member is a vehicle fairing. The thickness of the EPP core is 20 mm to 40 mm, and the density is 40 kg / m 3 ~90 kg / m 3 , and the thickness of the PDCPD skin is 1 mm to 2 mm.

[0013] A vehicle is also disclosed, which includes the above-mentioned exterior trim member.

[0014] A skin injection mold is also disclosed, which is applied to the preparation method of the above-mentioned exterior trim member. An injection cavity is provided in the skin injection mold. The shape of the injection cavity matches the shape of the foamed resin core. There is an injection gap between the cavity wall of the injection cavity and the surface area to be injection-molded of the foamed resin core. A liquid injection port is provided on the skin injection mold, and the liquid injection port is communicated with the injection gap. The liquid injection port is used to inject a thermosetting resin material whose curing temperature is lower than the softening temperature of the foamed resin core. Through the injection gap, the thermosetting resin material can form a flat injection-molded resin skin on the surface of the foamed resin core.

[0015] Preferably, the skin injection mold includes an upper mold and a lower mold that can be closed. The liquid injection port includes a liquid injection port A and a liquid injection port B. The liquid injection port A and the liquid injection port B are respectively provided on the upper mold and the lower mold. Both the liquid injection port A and the liquid injection port B are used to inject thermosetting resin materials.

[0016] The present invention has achieved the following technical effects compared with the prior art:

[0017] By injection molding a thermosetting resin material on the surface of the foamed resin core, the present invention can prepare an exterior member with a flat injection-molded resin skin, thereby solving the problems of uneven surface appearance and difficult spraying of the foamed resin member, so that the foamed resin member is expected to be extended to the application of exterior parts. At the same time, the curing temperature of the thermosetting resin material used for the injection-molded resin skin is lower than the softening temperature of the foamed resin core, which can ensure the stable material performance of the foamed resin core at this temperature during hot injection molding and prevent softening. In addition, compared with spraying-type solutions such as spraying polyurea, the injection molding method has a shorter production cycle and broad application prospects and commercial value. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0019] Figure 1 Schematic diagram of the mold closing process of the skin injection mold in the embodiment of the present invention;

[0020] Figure 2 Schematic diagram of the structure of the exterior member as a vehicle fairing in the embodiment of the present invention;

[0021] Figure 3 Schematic diagram of the partially cut-away structure of the vehicle fairing in the embodiment of the present invention.

[0022] Description of the reference numerals: 1. Vehicle fairing; 2. Foamed resin core; 3. Injection-molded resin skin; 4. Upper mold; 5. Lower mold; 6. Liquid injection port A; 7. Liquid injection port B. Detailed Embodiments

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0024] The object of the present invention is to provide a method for preparing an exterior trim member, an exterior trim member, an automobile and an epidermal injection mold, so as to solve the problems existing in the prior art, and solve the problems that the surface appearance of the foamed resin member is uneven and not easy to spray, so that the foamed resin member is expected to be extended to the application of exterior trim parts, and has broad application prospects and commercial value.

[0025] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Embodiment

[0026] This embodiment provides a method for preparing an exterior trim member, as Figures 1 to 3 shown, including the following steps:

[0027] Inject a thermosetting resin material on the surface of the foamed resin core 2 to form an exterior trim member with a flat injection-molded resin skin 3, wherein the curing temperature of the thermosetting resin material is lower than the softening temperature of the foamed resin core 2. Due to its molding process, the surface of the foamed resin core 2 is uneven, not easy to spray, and not suitable for use as an exterior trim part. By injecting the injection-molded resin skin 3 on the surface of the foamed resin core 2 and forming and curing integrally with the foamed resin core 2, a relatively flat surface can be provided, thus solving the problems of poor appearance and not easy to spray caused by the uneven surface of the foamed resin member, and not being suitable for use as an exterior trim part. The curing temperature of the thermosetting resin material used for the injection-molded resin skin 3 is lower than the softening temperature of the foamed resin core 2, which can ensure the stable material properties of the foamed resin core 2 at this temperature during hot injection molding and prevent softening. In addition, by injecting and molding the injection-molded resin skin 3 on the surface of the foamed resin core 2 to solve the problems of uneven surface appearance and not easy to spray, compared with methods such as spraying polyurea on the surface of the foamed resin core 2, the preparation cycle of this method can be greatly shortened.

[0028] The surface of the above-mentioned foamed resin core 2 includes but is not limited to the outer surface of the foamed resin core 2 (the side shown outside, that is, the exterior surface) or the inner and outer surfaces of the foamed resin core 2 (the inner surface is the side not shown outside). Preferably, the inner and outer surfaces of the foamed resin core 2 can be injected with the injection-molded resin skin 3, so that the injection-molded resin skin 3 can completely wrap the foamed resin core 2 to form a sandwich structure. This method can be widely applied to different types of foamed resin cores 2, such as EPP material cores, EPS material cores and polyurethane material cores. The above-mentioned exterior trim members are various members with decorative functions. Of course, the members can also include other actual functions, not limited to only decorative functions, such as vehicle exterior trim parts, household exterior trim parts or industrial exterior trim parts, etc. Vehicle exterior trim parts such as vehicle air deflectors, front grilles, side skirts or door lower trim panels, etc. Note: EPS material is polystyrene material.

[0029] In one embodiment, as Figures 1 to 3 shown, the following steps are further included: removing the corner burrs of the injection-molded resin skin 3, and cleaning and repairing the injection-molded resin skin 3. During the repair, key attention is paid to repairing the material shortage areas, as well as cleaning and repairing the installation point areas.

[0030] In one embodiment, as Figures 1 to 3 shown, the following steps are further included: preparing the foamed resin core 2, and injecting the foamed resin material into the core injection mold to obtain the foamed resin core 2.

[0031] In one embodiment, as Figures 1 to 3 shown, during the preparation of the injection-molded resin skin 3, first preheat the skin injection mold, place the foamed resin core 2 in the skin injection mold and close the mold, inject the liquid thermosetting resin material from the liquid injection port of the skin injection mold, and perform pressure holding after the liquid is filled. After pressure holding for a preset time, demold to obtain the exterior trim member.

[0032] In one embodiment, as Figures 1 to 3 shown, the foamed resin core 2 is an EPP core, and the injection-molded resin skin 3 is a PDCPD skin. When preparing the EPP core, inject the EPP material into the core injection mold to obtain the EPP core. When preparing the PDCPD skin, first preheat the skin injection mold to 50°C - 80°C, then place the EPP core in the skin injection mold and close the mold. The liquid injection port of the skin injection mold is used to inject the mixed liquid of liquid A and liquid B. Liquid A includes DCPD and an activator, and liquid B includes DCPD and a catalyst. After the liquid is filled, perform pressure holding for 3 min - 5 min, and demold to obtain the exterior trim member. Note: EPP is a foamed polypropylene material, the PDCPD material is a poly(dicyclopentadiene) material, and DCPD is dicyclopentadiene.

[0033] The foamed resin core 2 uses an EPP core. The EPP material has good strength and stiffness, and can meet the requirements of products with higher stiffness requirements. Moreover, compared with the fiberglass exterior trim parts, in addition to better stiffness, it is also lighter in weight, meeting the lightweight requirements. The injection-molded resin skin 3 is a PDCPD skin. The PDCPD material belongs to a low-temperature curing resin, and the curing temperature is below 100°C. The highest temperature that the EPP material can usually withstand is 130°C. The material properties of the EPP material are stable at this temperature and will not show softening. The matching of the two materials is good. And if PDCPD skins are injection-molded on both the inner and outer surfaces (the overall surface) of the EPP core, the PDCPD will shrink to a certain extent after forming and curing, and the PDCPD skin will tightly wrap the EPP core inside, enabling the PDCPD skin and the EPP core to be combined together, solving the appearance problem and the problem of difficult spraying.

[0034] In one embodiment, asFigures 1 to 3 As shown, the injection molding resin skin 3 is a PDCPD skin. The PDCPD skin is used to wrap the EPP inner core. After the PDCPD is formed and cured, it will shrink to a certain extent and combine with the EPP inner core, solving the appearance problem and the problem of difficult spraying. At the same time, the PDCPD material is a low-temperature curing resin with a curing temperature below 100°C. The EPP material performance is stable at this temperature and will not soften. The two materials have good matching. Of course, in addition to the PDCPD skin, the injection molding resin skin 3 can also use other thermosetting resin materials with a curing temperature below 130°C. However, in order to avoid the influence of the adjacent temperature, the curing temperature of the thermosetting resin material used in the injection molding resin skin 3 is usually lower than 125°C, such as epoxy resin material.

[0035] In one embodiment, if Figures 1 to 3 As shown, the mounting nuts are embedded in advance during the preparation of the foamed resin inner core 2, and the mounting nuts are temporarily blocked before the resin skin 3 is injection molded. Example

[0036] This embodiment provides an exterior decoration component, which can be made by the exterior decoration component preparation method in Embodiment 1, or can be made by other preparation methods, such as Figures 1 to 3 As shown, it includes a foamed resin core 2 and an injection-molded resin skin 3. The injection-molded resin skin 3 is injection-molded on the surface of the foamed resin core 2. The injection-molded resin skin 3 is made of a thermosetting resin material whose curing temperature is lower than the softening temperature of the foamed resin core 2.

[0037] The surface of the foamed resin core 2 mentioned here includes the outer surface of the foamed resin core 2 (the side displayed outside, i.e., the outer surface) or the inner and outer surfaces of the foamed resin core 2 (the inner surface is the side not displayed outside). If the inner and outer surfaces of the foamed resin core 2 are both injection molded with the injection molded resin skin 3, the exterior component formed at this time is a sandwich structure. By injecting the injection molded resin skin 3 on the surface of the foamed resin core 2, after being molded and cured together with the foamed resin core 2, a relatively flat surface can be provided, thereby solving the problem of the appearance and difficulty in spraying caused by the uneven surface of the foamed resin component, which is not suitable for use as an exterior component.

[0038] In one embodiment, if Figures 1 to 3As shown, the foamed resin inner core 2 is an EPP inner core, and the injection-molded resin skin 3 is a PDCPD skin. The exterior trim component prepared with the EPP inner core can meet the products with higher stiffness requirements and lightweight needs. Using the PDCPD skin, on the one hand, the PDCPD material belongs to a low-temperature curing resin, and the curing temperature is below 100°C. The material properties of EPP are stable at this temperature and will not show softening. The matching of the two materials is good. On the other hand, when manufacturing the exterior trim component, if the entire surface of the EPP inner core is injection-molded with the PDCPD skin, after the PDCPD is formed, the PDCPD skin will wrap the EPP inner core. And during the forming and curing process of the PDCPD, a certain degree of shrinkage will occur, making the combination of the PDCPD skin and the EPP inner core tighter.

[0039] In one embodiment, as Figures 1 to 3 shown, the exterior trim component is a vehicle air deflector 1. The thickness of the EPP inner core is 20 mm to 40 mm, and the density is 40 kg / m 3 ~90 kg / m 3 , and the thickness of the PDCPD skin is 1 mm - 2 mm. Of course, this is just one embodiment. The exterior component can also be other vehicle exterior trim parts or non-vehicle exterior trim parts. Vehicle exterior trim parts such as a front grille, side skirts, or door trim panels, etc. Example

[0040] This example provides an automobile, including the exterior trim component in Example 2. The exterior trim component can be a vehicle air deflector, a front grille, side skirts, a door trim panel, or other vehicle exterior trim components. Example

[0041] This example provides an injection mold for the skin, which can be applied to the preparation method of the exterior trim component in Example 1. Of course, it can also be used in the preparation methods of other components with skin injection requirements, such as Figures 1 to 3 shown, an injection cavity is provided in the injection mold for the skin. The shape of the injection cavity matches the shape of the foamed resin inner core 2. There is an injection gap between the cavity wall of the injection cavity and the area to be injection-molded on the surface of the foamed resin inner core 2. A liquid injection port is provided on the injection mold for the skin, and the injection port is communicated with the injection gap. The injection port is used to inject a liquid thermosetting resin material whose curing temperature is lower than the softening temperature of the foamed resin inner core 2. The cavity wall of the injection cavity is smooth. After injecting the thermosetting resin material through the injection port, a flat injection-molded resin skin 3 can be formed on the surface of the foamed resin inner core 2 under the action of the injection gap.

[0042] In one embodiment, as Figures 1 to 3As shown, the skin injection mold includes an upper mold 4 and a lower mold 5, and the upper mold 4 and the lower mold 5 can be closed to form the skin injection mold. The injection ports include an injection port A 6 and an injection port B 7. The injection port A 6 and the injection port B 7 are respectively provided on the upper mold 4 and the lower mold 5. For example, the upper mold 4 is provided with the injection port A 6 and the lower mold 5 is provided with the injection port B 7, or the upper mold 4 is provided with the injection port B 7 and the lower mold 5 is provided with the injection port A 6. Both the injection port A 6 and the injection port B 7 are used to inject thermosetting resin materials. When the injection-molded resin skin 3 is a PDCPD skin, the injection port A 6 and the injection port B 7 both inject a mixture of liquid A and liquid B. Liquid A includes DCPD and an activator; liquid B includes DCPD and a catalyst.

[0043] In one embodiment, as Figures 1 to 3 shown, the exterior member is a vehicle fairing 1, and the shape of the foamed resin inner core 2 is the shape of the vehicle fairing 1, then the injection cavity is a shape matching the shape of the vehicle fairing 1. Specifically, the foamed resin inner core 2 includes an arc-shaped plate portion and vertical plate support portions respectively provided on both sides of the arc-shaped plate portion, forming a fairing shape with an opening at one end (such as Figure 1 the left end in) and at the bottom. The upper surface of the arc-shaped plate portion and the outer sides of the two vertical plate support portions form the outer surface of the foamed resin inner core 2, and the lower surface of the arc-shaped plate portion and the inner sides of the two vertical plate support portions form the inner surface of the foamed resin inner core 2. The upper mold 4 includes an upper mold groove, and the shape of the upper mold groove matches the outer surface shape of the foamed resin inner core 2. The upper mold groove also forms a fairing shape with an opening at one end (such as Figure 1 the left end in) and at the bottom. The end opening of the upper mold groove is provided with an upper mold end edge, and the bottom opening of the upper mold groove is provided with an upper mold bottom edge. The upper mold groove should be larger than the size of the foamed resin inner core 2, that is, there should be an injection gap between the groove surface of the upper mold groove and the outer surface of the foamed resin inner core 2. The lower mold 5 includes a lower mold protrusion, and the lower mold protrusion is a lower mold protrusion that matches the inner surface shape of the foamed resin inner core 2. The lower mold protrusion should be smaller than the size of the foamed resin inner core 2, that is, there should be an injection gap between the protrusion surface of the lower mold protrusion and the inner surface of the foamed resin inner core 2. The bottom and end of the lower mold protrusion are respectively provided with a lower mold end edge and a lower mold bottom edge. The lower mold bottom edge is used to support the upper mold bottom edge and the two vertical plate support portions of the foamed resin inner core 2 to ensure that there is an injection gap between the protrusion surface of the lower mold protrusion and the inner surface of the foamed resin inner core 2, and there is an injection gap between the groove surface of the upper mold groove and the outer surface of the foamed resin inner core 2. The lower mold end edge is used to fit with the upper mold end edge to limit the upper mold 4.

[0044] In the present invention, specific examples are used to illustrate the principles and implementation manners of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation on the present invention.

Claims

1. An epidermal injection mold, characterized in that, The skin injection mold is provided with an injection cavity, the shape of the injection cavity matches the shape of the foamed resin inner core, there is an injection gap between the cavity wall of the injection cavity and the surface injection area of the foamed resin inner core, the skin injection mold is provided with a liquid injection port, the liquid injection port is communicated with the injection gap, and the liquid injection port is used for injecting a thermosetting resin material with a curing temperature lower than the softening temperature of the foamed resin inner core. Through the injection gap, the thermosetting resin material can form a flat injection resin skin on the surface of the foamed resin inner core; The skin injection mold includes an upper mold and a lower mold that can be closed. The liquid injection port includes a liquid injection port A and a liquid injection port B. The upper mold and the lower mold are respectively provided with the liquid injection port A and the liquid injection port B. Both the liquid injection port A and the liquid injection port B are used for injecting thermosetting resin materials; The foamed resin inner core includes an arc-shaped plate portion and vertical plate support portions respectively arranged on both sides of the arc-shaped plate portion, forming a diversion hood shape with openings at the end and the bottom. The upper surface of the arc-shaped plate portion and the outer sides of the two vertical plate support portions form the outer surface of the foamed resin inner core, and the lower surface of the arc-shaped plate portion and the inner sides of the two vertical plate support portions form the inner surface of the foamed resin inner core; The upper mold includes an upper mold groove, the shape of the upper mold groove matches the outer surface shape of the foamed resin inner core, and the upper mold groove also presents a diversion hood shape with openings at the end and the bottom. The end opening of the upper mold groove is provided with an upper mold end edge, and the bottom opening of the upper mold groove is provided with an upper mold bottom edge. The upper mold groove is larger than the size of the foamed resin inner core, so that there is an injection gap between the groove surface of the upper mold groove and the outer surface of the foamed resin inner core. The lower mold includes a lower mold protrusion, and the lower mold protrusion is a lower mold protrusion that matches the inner surface shape of the foamed resin inner core. The lower mold protrusion is smaller than the size of the foamed resin inner core, so that there is an injection gap between the protrusion surface of the lower mold protrusion and the inner surface of the foamed resin inner core. The bottom and end of the lower mold protrusion are respectively provided with a lower mold end edge and a lower mold bottom edge. The lower mold bottom edge is used to support the upper mold bottom edge and the two vertical plate support portions of the foamed resin inner core to ensure that there is an injection gap between the protrusion surface of the lower mold protrusion and the inner surface of the foamed resin inner core, and there is an injection gap between the groove surface of the upper mold groove and the outer surface of the foamed resin inner core. The lower mold end edge is used to fit with the upper mold end edge.

2. A method for preparing an exterior trim member, characterized in that, An exterior trim member injection-molding die for the skin as claimed in claim 1 is adopted, which comprises the following steps: injecting a thermosetting resin material onto the surface of a foamed resin core to form an exterior trim member with a flat injection-molded resin skin, wherein the curing temperature of the thermosetting resin material is lower than the softening temperature of the foamed resin core. During the preparation of the injection-molded resin skin, first preheat the skin injection-molding die, place the foamed resin core in the skin injection-molding die and close the die, inject the liquid thermosetting resin material from the liquid injection port of the skin injection-molding die, perform pressure holding after the liquid is filled, and perform demolding after pressure holding for a preset time to obtain the exterior trim member.

3. The method for preparing an exterior member according to claim 2, characterized in that, The following steps are further included: Removing the burrs at the corners of the injection-molded resin skin, and cleaning and repairing the injection-molded resin skin.

4. The method for preparing an exterior member according to claim 2 or 3, characterized in that, The following steps are further included: Preparing a foamed resin core by injecting a foamed resin material into an inner core injection-molding die to obtain the foamed resin core.

5. The method for preparing an exterior trim member according to claim 2, wherein, The foamed resin core is an EPP core, and the injection-molded resin skin is a PDCPD skin; during preheating, preheat the skin injection-molding die to 50°C to 80°C. The liquid injection port of the skin injection-molding die is used to inject a mixture of liquid A and liquid B. Liquid A includes DCPD and an activator, and liquid B includes DCPD and a catalyst. After the liquid is filled, perform pressure holding for 3 minutes to 5 minutes, and perform demolding to obtain the exterior trim member.

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