JP6216867B2 - Resin molded product and manufacturing method thereof - Google Patents

Description

  The present invention relates to a resin molded product in which a resin base material layer, a foamed resin layer, and a resin skin layer are laminated in this order, and a method for producing the same.

  FIG. 10 simply shows a side cross section of the instrument panel 1 of an automobile cut in a direction substantially orthogonal to the longitudinal direction in the vicinity of the airbag pocket. The instrumental panel 1 is a resin molded product configured by laminating a resin base layer 2, a foamed resin layer 3, and a resin skin layer 4 in this order, and joining adjacent layers together ( For example, see JP-A-11-151728.

  Here, the resin base material layer 2 is configured by fitting a pocket door 6 made of resin into a predetermined portion of the panel body 5 made of resin. This resin base material layer 2 is hold | maintained at the lower mold | type of a vacuum forming apparatus, for example, and an adhesive agent is apply | coated after that. Furthermore, a bonded body in which a lightweight foamed resin layer 3 containing bubbles (cells) 3a dispersed in a substantially uniform manner and a resin skin layer 4 are bonded in advance to the resin base material layer 2 is laminated, Vacuum forming is performed. Thereby, the instrument panel 1 molded into a predetermined shape is obtained.

  The instrument panel 1 is attached to the vehicle body so that the resin skin layer 4 is on the side of the design surface that the user (automobile occupant) can visually recognize.

  Originally, it is desirable that there is no height difference (step) between the end face of the panel body 5 facing the foamed resin layer 3 and the end face of the pocket door 6 facing the foamed resin layer 3. However, when a plurality of panel main bodies 5 and pocket doors 6 are continuously obtained by injection molding or the like, those having different dimensions within a tolerance range may be produced. If the panel body 5 is larger than the design dimension and the pocket door 6 is smaller than the design dimension, as shown in an exaggerated manner in FIG. 11, a depressed portion 7 is generated in the vicinity of the pocket door 6, and the panel body 5 Protrusions 8 are produced in the vicinity of. A step 9 is formed based on the height difference between the depressed portion 7 and the protruding portion 8.

  On the other hand, in the foamed resin layer 3, the thickness of the part laminated | stacked on the depression part 7 and the thickness of the part laminated | stacked on the protrusion part 8 are substantially equivalent. For this reason, the step 10 corresponding to the step 9 of the resin base material layer 2 is generated in the foamed resin layer 3.

  In the resin skin layer 4 on the foamed resin layer 3, a recess referred to as a deform 11 is formed in a portion laminated above the step 10 corresponding to the step 10. When the deform 11 is relatively large, the user recognizes the presence of the deform 11. That is, the aesthetics of the design surface is poor.

  Thus, the instrument panel 1 in which the aesthetic defect is generated on the design surface cannot be used as a product. For this reason, there is a disadvantage that it is not easy to improve the yield.

  A general object of the present invention is to provide a resin molded product in which a step is avoided in a foamed resin layer even if a step is generated in the resin base material layer.

  A main object of the present invention is to provide a resin molded product in which deformation is not formed on a resin skin layer.

  Another object of the present invention is to provide a method for producing a resin molded product for obtaining the resin molded product described above.

According to one embodiment of the present invention, in the resin molded product in which the resin base material layer, the foamed resin layer, and the resin skin layer are laminated in this order,
On the end surface of the resin base layer facing the foamed resin layer, a step is formed by the presence of a depression and a protrusion,
The portion of the foamed resin layer that is laminated to the depressed portion is a thick portion having a large thickness, and the portion that is laminated to the protruding portion is a thin portion having a smaller thickness than the thick portion. A molded article is provided.

  In such a configuration, the step of the resin base material layer is eliminated by the thick part and the thin part of the foamed resin layer. For this reason, it is avoided that the level | step difference according to the level | step difference of the resin base material layer arises in the upper end surface (end surface facing the resin skin layer) of a foamed resin layer. As a result, it is possible to avoid formation of a depression (deformation) corresponding to the step on the outer surface of the resin skin layer, in other words, the design surface visually recognized by the user.

  Even if the deform is formed, the depth is 0.1 mm or less. It is difficult for the user to visually recognize such a minimal deformation. That is, even in this case, the user cannot recognize the presence of the deform.

  Eventually, with the above-described configuration, a resin molded product excellent in aesthetics can be obtained.

  For example, it is preferable that the thin-walled portion laminated on the protruding portion is partly plastically deformed and the thick-walled portion laminated on the depressed portion is elastically deformable. In this case, it is difficult for the thin-walled portion to return due to elasticity, and thus the thin-walled portion can easily maintain the original thickness. Therefore, it becomes easier to avoid the formation of the deform.

In the present invention, as well as formed to be inclined a step, the protruding portion positioned vertically above the recess, the end on the side facing the recess, the thickness changing portions which thickness is gradually reduced you formed. In this case, the part laminated | stacked on the boundary of a protrusion part and a depression part of a foamed resin layer changes following a thickness change part. For this reason, it becomes difficult to produce a gap between the boundary and the foamed resin layer.

  When the gap is generated, after the mold opening after molding, the portion laminated at the boundary between the protruding portion and the depressed portion is easily returned by elasticity. For this reason, the portion of the resin skin layer laminated on the portion easily returns to the pre-molding position, thereby causing deformation.

  On the other hand, in the above case, the gap is filled with the deformed foamed resin layer. Accordingly, the portion laminated at the boundary between the protruding portion and the depressed portion is sufficiently compressed, so that it is difficult to return due to elasticity. As a result, it is avoided that a deform is formed on the outer surface (design surface) of the resin skin layer.

  In the above configuration, the resin base layer may be formed from a plurality of resin members.

According to another embodiment of the present invention, in the method for producing a resin molded product in which the resin base material layer, the foamed resin layer, and the resin skin layer are laminated in this order,
Laminating the foamed resin layer and the resin skin layer on the end surface of the resin base material layer where a step is formed due to the presence of a depression and a protrusion, and obtaining a laminate;
A step of forming by applying pressure to the laminate using a mold; and
Have
In the portion of the foamed resin layer laminated on the depressed portion, the amount of return of the thickness after mold opening is large, and in the portion laminated on the protruding portion, the thickness return after mold opening is increased. There is provided a method for producing a resin molded product to be applied so that the amount is small.

  Typically, by applying pressure, it is possible to obtain a portion where the return amount of the foamed resin layer is large as a thick portion and a portion where the return amount is small as a thin portion.

  In the method of manufacturing a resin molded product according to the prior art, pressure is applied by a mold when the upper end surface of the foamed resin layer (the end surface facing the resin skin layer) becomes flat or slightly compressed. It will be terminated when it is done. For this reason, the return amount of the foamed resin layer after mold opening is substantially the same regardless of the part. Therefore, it is easy to form a deformation in which the portion laminated on the protruding portion is convex and the portion laminated on the depressed portion is concave.

  In contrast, in the present invention, the pressure applied by the mold is such that the return amount of the foamed resin layer after opening the mold between the portion of the foamed resin layer laminated on the protruding portion and the portion laminated on the depressed portion is Grant differently. As a result, the thick portion and the thin portion are formed in the foamed resin layer, thereby eliminating the level difference of the resin base material layer. Thereby, it can avoid that a deform is formed in the outer surface of a resin skin layer. That is, a resin molded product excellent in aesthetics can be obtained.

  In addition, since the deformation that can be visually recognized by the user is not formed, the yield is also improved.

  The applied pressure may be set such that, for example, the thin wall portion undergoes plastic deformation and the thick wall portion elastically deforms within the elastic deformation region. Thereby, it can avoid that a thin part returns to the thickness before pressurization after mold opening as mentioned above. Therefore, it becomes easier to avoid the formation of a deform on the outer surface of the resin skin layer.

  In addition, you may make it provide a nesting with respect to a metal mold | die so that a pressurizing force may differ. In this case, when the laminated body is molded, the depressed portion may be pressed by nesting, and a greater pressing force may be applied to the depressed portion than other portions.

  Further, when the step is formed to be inclined, for the reason described above, when the protruding portion is positioned vertically higher than the depressed portion, the end of the protruding portion facing the depressed portion positioned vertically below the depressed portion A thickness change portion where the thickness gradually decreases may be formed in the portion. In this case, since the foamed resin layer deforms following the thickness change portion, the amount of compression of the portion of the foamed resin layer laminated at the boundary between the protruding portion and the depressed portion can be increased. In other words, it is easy to form a thin portion with a small return amount. Therefore, in this case as well, it is possible to avoid the deformation.

  The resin base layer may be obtained by combining a plurality of resin members as described above.

  Moreover, vacuum forming is mentioned as a suitable specific example of a shaping | molding method.

FIG. 1 is a side sectional view schematically showing a part of an instrument panel which is a resin molded product according to an embodiment of the present invention. FIG. 2 is a schematic longitudinal sectional view showing a state in which the upper die is lowered and the die is closed after holding the laminated body in the lower die of the vacuum forming apparatus. FIG. 3 is a schematic longitudinal sectional view showing a state where the upper mold is further lowered from FIG. FIG. 4 is a schematic longitudinal sectional view showing a state where the upper mold is raised from FIG. 3 and the mold is opened. FIG. 5 is a schematic vertical cross-sectional view showing a state in which the laminated body in which the inclined step is formed is held in the lower mold, and then the upper mold is lowered and the mold is closed. FIG. 6 is a schematic longitudinal sectional view showing a state where the upper mold is further lowered from FIG. FIG. 7 is a schematic longitudinal sectional view showing a state in which the upper mold is raised from FIG. 6 and the mold is opened. FIG. 8 is a simplified side cross-sectional view of a resin molded product in which a step opposite to that shown in FIGS. FIG. 9 is a schematic longitudinal sectional view showing a state in which the depressed portion is pressed by the nest provided in the lower mold. FIG. 10 is a side cross-sectional view schematically showing a part of an instrumental panel (resin molded product) having a deformed surface formed on a design surface. FIG. 11 is an enlarged view of a main part of FIG.

  Hereinafter, preferred embodiments of the resin molded product and the manufacturing method thereof according to the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a side sectional view schematically showing a part of an instrument panel 20 as a resin molded product according to the present embodiment. The instrument panel 20 is formed by laminating and joining a resin base layer 22, a foamed resin layer 24, and a resin skin layer 26 in this order. In addition, in FIG. 1, the location which cut | disconnected the airbag pocket vicinity in the direction substantially orthogonal to a longitudinal direction is shown.

  The resin base material layer 22 is configured by fitting a pocket door 30 made of another resin member into a predetermined portion of the panel body 28 which is a resin member. The panel main body 28 and the pocket door 30 are made of, for example, polypropylene (PP) resin, acrylonitrile-butadiene-styrene copolymer (ABS) resin, or the like.

  The panel body 28 and the pocket door 30 are obtained by injection molding or the like. In the present embodiment, the panel main body 28 is made slightly larger than the design dimension, and the pocket door 30 is made slightly smaller than the design dimension. In the panel body 28 and the pocket door 30, the difference between the design dimension and the actual dimension is within the tolerance range.

  For this reason, the resin base material layer 22 has a depressed portion 32 in the vicinity of the pocket door 30 and a protruding portion 34 in the vicinity of the panel body 28. A step 36 is formed by the depressed portion 32 and the protruding portion 34. The step 36 is approximately 0.5 mm or less, typically about 0.4 mm.

  The foamed resin layer 24 is a resin foam such as polypropylene (PP) resin or polyethylene (PE) resin. That is, in the foamed resin layer 24, bubbles (cells) 24a having substantially the same diameter are dispersed substantially uniformly. Therefore, the foamed resin layer 24 is lightweight and flexible.

  The thickness of the foamed resin layer 24 differs depending on the step 36 of the resin base material layer 22. That is, the part laminated | stacked on the depression part 32 has a large thickness, while the part laminated | stacked on the protrusion part 34 has a small thickness. For this reason, the foamed resin layer 24 has a thick portion 38 and a thin portion 40.

  The thick portion 38 can be elastically deformed following the application and removal of the pressing force, for example. That is, the thick part 38 is an elastic body. On the other hand, most of the thin-walled portion 40 is compressed to the plastic deformation (permanent deformation) region, and for this reason, the elasticity is substantially lost. The formation of the thick part 38 and the thin part 40 will be described in detail later.

  As described above, since there is a portion having a different thickness in the foamed resin layer 24, the step 36 of the resin base material layer 22 is transferred to the foamed resin layer 24, and the foamed resin layer 24 is caused by this. It is possible to avoid the occurrence of the step 36 on the surface. As a result, the upper end surface of the foamed resin layer 24 (the end surface facing the resin skin layer 26) becomes substantially flat.

  As described above, in the present embodiment, the step 36 of the resin base material layer 22 is eliminated by the difference in thickness of the foamed resin layer 24. Therefore, it is possible to avoid a depression (deformation) based on the step 36 of the resin base material layer 22 on the outer surface of the resin skin layer 26 formed on the upper end surface of the foamed resin layer 24. Even when the deform is formed, the depth is about 0.1 mm at the maximum, and in this case, the user cannot visually recognize that the deform exists.

  That is, in this case, the resin skin layer 26 does not have a shape defect that is visible to the user. After all, the instrument panel 20 is excellent in aesthetics. For this reason, the yield is also good.

  Next, a case where the instrument panel 20 is obtained by vacuum molding will be described as an example with respect to the method for manufacturing a resin molded product according to the present embodiment.

  First, after the panel body 28 and the pocket door 30 are produced by injection molding, the pocket door 30 is fitted into a predetermined portion of the panel body 28. Thereby, the resin base material layer 22 is formed. At this time, a step 36 is generated in the resin base material layer 22 due to a dimensional difference between the panel main body 28 and the pocket door 30. That is, the depressed portion 32 is generated in the vicinity of the pocket door 30, and the protruding portion 34 is generated in the vicinity of the panel body 28.

  Next, the resin base material layer 22 is held on the lower mold 42 (mold) of the vacuum forming apparatus as shown in FIG. Thereafter, the joined body in which the foamed resin layer 24 and the resin skin layer 26 are joined in advance and the adhesive is applied to the foamed resin layer 24 is placed so that the foamed resin layer 24 faces the resin base material layer 22. . Since the joined body is soft and rich in flexibility, the joined body bends according to the step 36 of the resin base material layer 22 at this time. That is, the part laminated | stacked on the protrusion part 34 protrudes, and the part laminated | stacked on the depression part 32 sinks.

  Next, the upper mold 44 (mold) is lowered under the action of a lifting mechanism (not shown). Thus, the mold is closed and the cavity 46 is formed.

  Pressure is applied to the laminate of the resin base layer 22, the foamed resin layer 24 and the resin skin layer 26 by the pressing force from the upper mold 44 and the reaction force of the lower mold 42. By this applied pressure, the foamed resin layer 24 and the resin skin layer 26 are mainly compressed, and the laminate is roughly bent and deformed along the shape of the lower mold 42. At the same time, the resin base material layer 22 and the foamed resin layer 24 are bonded to each other through an adhesive applied to the surface of the resin base material layer 22.

  In this process, the raised portion and the depressed portion of the joined body disappear, and the upper end surfaces of the foamed resin layer 24 and the resin skin layer 26 are apparently flat as shown in FIG. Since the resin base material layer 22 is relatively hard, the protrusion 34 and the depression 32 (step 36) do not disappear.

  In vacuum forming according to the prior art, the lowering of the upper mold 44 is terminated at a position where the pressure applied by the upper mold 44 is within the elastic deformation region of the foamed resin layer 24. On the other hand, in the present embodiment, the upper mold 44 is lowered further. That is, the compression further proceeds after the upper end surface of the foamed resin layer 24 is apparently flat. For this reason, both the site | part laminated | stacked on the protrusion part 34 and the site | part laminated | stacked on the depression part 32 of the foamed resin layer 24 are compressed.

  As a result of such application of pressure, the amount of compression varies depending on the portion of the foamed resin layer 24. Specifically, the amount of compression is reduced at the portion laminated on the depressed portion 32, and the thick portion 38 is formed. On the other hand, the part laminated | stacked on the protrusion part 34 becomes the thin part 40 because the compression amount is large.

  The pressure applied by the lower mold 42 and the upper mold 44 is controlled so that, for example, the thick portion 38 remains in the elastic deformation region and the thin portion 40 becomes a plastic deformation region. In this case, after the applied pressure is removed, the thick portion 38 is restored to an extent that is substantially equal to or slightly less than the thickness before pressurization by elastic deformation. For this reason, the thick portion 38 can be further elastically deformed following the application and removal of the applied pressure after molding.

  On the other hand, in this case, most of the thin portion 40 has undergone plastic deformation (permanent deformation), and a small portion is deformed within the elastic deformation region. For this reason, the amount of elastic deformation of the thin portion 40 when the mold opening is performed after molding or when the applied pressure is applied and removed is also small.

  In this way, the cavity 46 is evacuated while applying pressure. Here, a plurality of suction holes 48 and 50 are formed in each of the lower mold 42 and the upper mold 44. The cavity 46 is evacuated through suction holes 48 and 50 under the action of an intake mechanism (not shown). Along with this, the inside of the cavity 46 becomes negative pressure, so that the laminate is bent and deformed more finely following the shapes of the lower mold 42 and the upper mold 44. As a result, the laminate has a shape as the instrument panel 20. Further, when a textured shape is formed on the surface of the lower mold 42 or the upper mold 44, the textured shape is clearly transferred to the resin base material layer 22.

  Thereafter, if necessary, compressed gas is supplied to the cavity 46 through the suction hole 50 of the upper mold 44 from a compressed gas supply mechanism (not shown). Alternatively, the suction hole 50 of the upper mold 44 may be opened to the atmosphere. In this state, when the inside of the cavity 46 is evacuated through the suction hole 48 of the lower mold 42 under the action of the intake mechanism, the laminate is pressed toward the lower mold 42. As a result, the laminate is deformed more precisely following the shape of the lower mold 42.

  After a predetermined time has elapsed, the evacuation in the cavity 46 (and the supply of compressed gas to the cavity 46) is terminated, and the upper mold 44 is raised to open the mold as shown in FIG. Thereby, the instrument panel 20 as a resin molded product is exposed.

  When the mold is opened, the foamed resin layer 24 and the resin skin layer 26 compressed by the pressure from the lower mold 42 and the upper mold 44 try to return to the original thickness. At this time, the thick portion 38 is relatively easy to return, while the thin portion 40 is relatively difficult to return. This is because the compression amount is small in the thick portion 38 and the compression amount is large in the thin portion 40 as described above.

  This tendency is particularly noticeable when the thin portion 40 undergoes plastic deformation and the thick portion 38 is within the elastic deformation region. This is because it is difficult for the thin-walled portion 40 that has undergone plastic deformation to return to its original thickness due to elastic deformation, and the thick-walled portion 38 that is within the elastic deformation region can easily return to its original thickness due to elastic deformation. .

  For this reason, although the foamed resin layer 24 is laminated on the resin base material layer 22 where the projecting portion 34 and the depressed portion 32 (step 36) are present, the upper end surface thereof becomes substantially flat. Therefore, the upper end surface (outer surface) of the resin skin layer 26 laminated on the upper end surface of the foamed resin layer 24, that is, the design surface visually recognized by the user is also substantially flat, so that it is avoided that a deform is formed after all. Is done. Even if the deform is formed, the depth is 0.1 mm or less, and it is difficult for the user to recognize the presence of the deform.

  As described above, at the time of vacuum forming, the foamed resin layer 24 has a large amount of return of the thickness after opening the portion laminated to the depression 32 and the thickness after opening the portion laminated to the protruding portion 34. By applying a pressing force so that the return amount of the resin layer is reduced, the thick portion 38 and the thin portion 40 can be formed in the foamed resin layer 24. As a result, the depth of the deformation formed on the outer surface of the resin skin layer 26 can be controlled to 0.1 mm or less, which is difficult for the user to visually recognize.

  2 to 4, the lower mold 42 and the upper mold 44 and the instrument panel 20 are shown in a simplified manner. However, in the actual lower mold 42 and the upper mold 44, as shown in FIG. There may be a portion that is parallel or inclined with respect to the direction or the direction of gravity. If a step 36 that is inclined based on the protrusion 34 and the recessed portion 32 is formed in such a place, depending on the degree of the step 36, the protrusion 34 and the recessed portion positioned vertically upward after vacuum forming is performed. A gap C may be formed between the boundary with 32 and the foamed resin layer 24 immediately above the boundary. If the mold is opened in this state, it is conceivable that the deformed portion is formed because the return amount of the portion laminated at the boundary between the protruding portion 34 and the depressed portion 32 is not sufficient.

  In such a case, as shown in FIG. 5, a change in thickness in which the thickness gradually decreases at the end of the projecting portion 34 positioned above the vertical direction on the side facing the depressed portion 32 positioned below the vertical direction. The part 52 is formed in advance. Thereafter, the joined body is placed on the resin base material layer 22 and the mold is closed to perform vacuum forming.

  The reason why the gap C is generated is that the foamed resin layer 24 is blocked by the sensitive end when the end of the protrusion 34 positioned vertically above the depressed portion 32 is sensitive, and follows the step 36. Therefore, it is assumed that it is not easy to deform. In contrast, in this embodiment, since the thickness changing portion 52 (concave portion) in which the thickness gradually decreases is provided at the end portion, the thickness of the end portion changes gradually as shown in FIG. To do. For this reason, it is avoided that the foamed resin layer 24 is blocked by the end portion of the protruding portion 34. Therefore, the foamed resin layer 24 can be deformed following the depression of the thickness changing portion 52 as shown in FIGS.

  As a result, the return amount of the portion stacked at the boundary between the protruding portion 34 and the depressed portion 32 is sufficient. That is, as shown in FIG. 7, the instrument panel 20 in which the deformation is avoided is obtained.

  As shown in FIG. 8, similarly, when the pocket door 30 is positioned above the panel body 28, it is possible to avoid the deformation by providing the thickness changing portion 52.

  In addition, as shown in FIG. 9, you may make it provide the insert 54 (movable metal mold | die) in the lower mold | type 42. FIG. The insert 54 moves back and forth under the action of the cylinder 56.

  In this case, instead of increasing the pressing force of the upper mold 44, the depressed portion 32 is pressed by the insert 54. For this purpose, for example, the pocket door 30 may be pressed by the insert 54. Thereby, a large pressing force is applied to the depressed portion 32 as compared with other portions. As a result, the thick portion 38 can be more easily returned after the mold is opened. This also contributes to avoiding deformation.

  The present invention is not particularly limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

  For example, it goes without saying that the resin molded product is not limited to the instrument panel 20. The resin base layer 22 may also be composed of a single member.

  In contrast to the above, the present invention can be applied even when the pocket door 30 is thicker than the panel body 28.

  Furthermore, molding for obtaining a resin molded product is not limited to vacuum molding, and for example, press molding may be employed.

Claims (10)

In the resin molded product (20) in which the resin base material layer (22), the foamed resin layer (24), and the resin skin layer (26) are laminated in this order,
On the end face of the resin base layer (22) facing the foamed resin layer (24), a step (36) is formed by the presence of a depression (32) and a protrusion (34),
The portion of the foamed resin layer (24) laminated on the depression (32) is a thick portion (38) having a large thickness, and the portion laminated on the protruding portion (34) is the thick portion. thickness small thin portion as compared with (38) (40) der is,
The step (36) is formed to be inclined, and when the projecting portion (34) is positioned above the depressed portion (32) in the vertical direction, the projecting portion (34) is positioned below the vertical direction. wherein the end portion on the side facing the recess (32), the thickness changing portion having a thickness which progressively reduces (52) resin molded article which is characterized that you have been formed to (20).   The resin molded product (20) according to claim 1, wherein the thin portion (40) is plastically deformed and the thick portion (38) is elastically deformable. ). The resin molded product (20) according to claim 1 or 2 , wherein the resin base layer (22) comprises a plurality of resin members (28, 30). In the method for producing a resin molded product (20) in which the resin base material layer (22), the foamed resin layer (24), and the resin skin layer (26) are laminated in this order,
The foamed resin layer (24) and the resin skin layer are formed on the end surface of the resin base layer (22) where the step (36) is formed by the presence of the depression (32) and the protrusion (34). (26) is laminated to obtain a laminate;
Using the molds (42, 44), a step of forming by applying pressure to the laminate;
Have
In the portion of the foamed resin layer (24) laminated to the depressed portion (32), the amount of return of the thickness after mold opening is large and the portion of the foamed resin layer (24) laminated to the protruding portion (34). Then, it provides so that the return amount of the thickness after mold opening may become small, The manufacturing method of the resin molded product (20) characterized by the above-mentioned. 5. The manufacturing method according to claim 4 , wherein a portion where the amount of return of the thickness of the foamed resin layer (24) is large is applied to the thick resin portion (38) by applying the pressure to the foamed resin layer (24). A method for producing a resin molded product (20), wherein a portion having a small amount is obtained as a thin-walled portion (40). The manufacturing method according to claim 5 , wherein the thin-walled portion (40) is obtained by plastic deformation, and the thick-walled portion (38) is obtained within an elastic deformation region. The manufacturing method according to any one of claims 4 to 6 , wherein a nest (54) is provided for the mold (42, 44), and the nest is formed when the laminated body is molded. (54) Pressing the depressed portion (32) to apply a larger pressing force to the depressed portion (32) than other portions, to manufacture a resin molded product (20) Method. The manufacturing method according to any one of claims 4 to 7 , wherein the step (36) is formed to be inclined, and the protruding portion (34) is vertically above the depressed portion (32). When positioned, a thickness changing portion (52) in which the thickness gradually decreases is formed at an end of the projecting portion (34) facing the depressed portion (32) positioned below the vertical direction, Then, the said laminated body is obtained, The manufacturing method of the resin molded product (20) characterized by the above-mentioned. The resin molded product (20) according to any one of claims 4 to 8 , wherein the resin base material layer (22) is obtained from a plurality of resin members (28, 30). Manufacturing method. The method for producing a resin molded product (20) according to any one of claims 4 to 9 , wherein vacuum forming is performed on the laminate.

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