JP2008030326A - Resin molded article having skin, and its molding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a molten resin from leaking out to the front surface side of the skin by partially adjusting the flowing velocity and the resin pressure of the molten resin which flows in a cavity. <P>SOLUTION: This resin molded article 1 having the skin comprising a base material 3 made of a resin constituting the molded article main body and the skin 5 made of a resin constituting the molded article surface layer is molded. The flowing velocity of a second molten resin 17 is reduced so that a first molten resin 15 injected from a gate corresponding to a flat section 27b of a molding die and reaching the cavity 13b corresponding to a side surface section 27a away from the gate may reach a joining point one step earlier than the second molten resin 17 flowing through the cavity 13b corresponding to the side surface section 27a closer to the gate. At the same time, a protruding section 19 imparting a flow resistance to the first molten resin 15 raise the resin pressure when the first molten resin 15 flows into the cavity 13b corresponding to the side surface section 27a from a cavity 13a corresponding to the flat section 27b is formed at a location being closer to the flat section 27b of the side surface section 27a of a protruding section 27 of a core die 31. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a resin-molded article with a skin used for automobile interior parts and the like, and a molding method thereof.

In Patent Documents 1 and 2, the cavity formed in the shape of the surface of the molded product in advance is set in a recess corresponding to the shape of the surface of the molded product of the cavity mold. A base material comprising a flat part and a side part bent from the outer peripheral edge of the flat part to the back side by injecting molten resin into a cavity formed between the convex part corresponding to the shape of the back of the molded product of the mold A technique for molding a resin-molded article with a skin in which the skin is integrally bonded to the surface is disclosed. In the above-mentioned patent document 1, an inclined part that inclines toward the inside is formed over the entire circumference of the skin terminal, while in the above-mentioned patent document 2, a flange part that projects outward is formed on the entire circumference of the skin terminal. A resin molded product that prevents the molten resin from leaking to the surface side of the skin by bringing the inclined portion and flange portion into close contact with the molding surface by the resin pressure of the molten resin injected into the cavity during molding The appearance is not impaired.
JP 11-77739 A (paragraph 0036, FIG. 1) JP 2002-172648 A (paragraphs 0011 column, 0012 column, FIG. 3)

  By the way, when molding a resin molded product as described above, depending on the shape of the molded product and the structure of the mold, the cavity is formed through the gate formed in the core mold corresponding to the uneven position of the flat portion of the base material. Molten resin may be injected. FIG. 5 shows a molded product a molded using such a mold, b is a resin base material constituting the molded product body, and c is a molded product surface layer integrally bonded to the surface of the base material b. The position corresponding to the gate is given a symbol d. Also, the alternate long and short dash line in the figure shows the entire flow of the molten resin that spreads from the gate to the cavity. Of this molten resin, the molten resin flows directly toward the cavity corresponding to the side surface portion of the base material b far from the gate. The resin is referred to as a first molten resin with the reference symbol f, and the molten resin that flows along the end of the cavity through the cavity corresponding to the side surface of the base material b close to the gate is added with the reference symbol g. This is referred to as the second molten resin.

  In order to mold the molded product a, as shown in FIG. 6, with the skin c set in the concave part i of the cavity mold h and the mold closed, the concave part i of the cavity mold h and the core mold j The molten resin is injected from the gate into the cavity m formed between the protrusion k. At this time, the first molten resin f that flows into the cavity m corresponding to the side surface portion n (side surface portion of the base material b) of the convex portion k far from the gate through the flat portion r in the wide range is the skin. The skin c flows from the base end of the side surface portion o of the c toward the terminal so that the skin c is brought into close contact with the side surface portion p of the recess i of the cavity mold h. On the other hand, the second molten resin g flowing into the cavity m corresponding to the side surface portion n (side surface portion of the base material b) of the convex portion k close to the gate through the flat portion r in a narrow range therebetween is also the first molten material. As with the resin f, the skin c flows from the base end of the side surface portion o of the skin c toward the terminal to bring the skin c into close contact with the side surface portion p of the concave portion i of the cavity mold h. The first molten resin f flows along the cavity m corresponding to the side surface portion n. Since the second molten resin g flows through the narrow cavity m corresponding to the side surface portion n, the flow velocity is higher than that of the first molten resin f flowing through the wide flat portion r, and the second molten resin g It is easy to reach the junction j (see FIG. 5) earlier than the first molten resin f, and when this happens, the second molten resin g flows along the side surface portion o of the skin c, and as shown in FIG. There is a problem in that the second molten resin g leaks to the surface side of the skin c due to wrapping around the surface side beyond the end of c, and the appearance of the resin molded product a is impaired.

  On the other hand, when the skin c is not accurately molded into a regular molded product surface shape due to molding errors or the like, a gap is formed between the two in a state where the skin c is set in the recess i of the cavity mold h. With the resin pressure, it is difficult for the side surface portion o of the skin c to be in close contact with the side surface portion p of the concave portion i of the cavity mold h. For this reason, the second molten resin g wraps around the surface side beyond the end of the skin c and is a resin molded product. The appearance of a will be impaired.

  The present invention has been made in view of the above points, and the object is to partially adjust the flow rate and the resin pressure of the molten resin flowing through the cavity, so that the molten resin leaks to the surface side of the skin. It is to prevent.

  In order to achieve the above object, the present invention provides a flow resistance to the molten resin flowing through the cavity corresponding to the side surface portion of the base material to reduce the flow velocity according to the location, and also changes the resin pressure. It is characterized by that.

  Specifically, the invention described in claim 1 is composed of a resin base material constituting the molded article body and a resin skin that is integrally joined to the surface of the base material and constitutes a molded article surface layer. The base material is a resin-molded article with a skin consisting of a flat part and a side part bent from the outer peripheral edge of the flat part to the back side, and the flat part of the mold is located near the flat part on the back side of the side part. A first molten resin that is injected from a gate that communicates with a cavity corresponding to the first cavity and flows directly toward a cavity corresponding to a side surface far from the gate, and a cavity terminal via a cavity corresponding to the side surface near the gate. And reducing the flow rate of the second molten resin so that the first molten resin reaches the merge point a little earlier than the second molten resin at the confluence of the second molten resin flowing along A mold that provides flow resistance to increase the resin pressure that presses the skin against the molding surface of the mold when the first molten resin flows from the cavity corresponding to the flat portion of the mold to the cavity corresponding to the side surface. The thin portion formed corresponding to the protruding amount of the protruding portion extends in the circumferential direction by the protruding portion on the side, and the thickness of the thin portion forming portion is formed thinner than the thickness of the flat portion. It is characterized by.

  According to a second aspect of the present invention, in the first aspect of the present invention, the thin portion is formed with a plurality of intervals in the circumferential direction.

  The invention according to claim 3 is composed of a resin base material constituting the molded product body and a resin skin integrally joined to the surface of the base material to constitute the molded product surface layer, and the base material is flat. On the premise of a molding method of a resin molded product with a skin consisting of a side surface portion bent from the outer peripheral edge of the flat portion to the back surface side, and a cavity mold having a recess corresponding to the molded product surface shape, Molding comprising a core mold having a corresponding convex portion, a gate is formed corresponding to the flat portion of the convex portion, and a resin flow resistance imparting means is provided near the flat portion of the side surface portion of the convex portion. A mold is prepared, and a skin formed in the shape of the molded product in advance is set in the concave portion of the cavity mold, and the mold is closed, and the cavity is formed in the cavity formed between the concave portion and the convex portion. Injection of molten resin from the gate The first molten resin that flows directly toward the cavity corresponding to the side surface far from the gate through the cavity corresponding to the portion flows into the cavity corresponding to the side surface by the resin flow resistance applying means. Flow resistance is applied to increase the resin pressure, and in the process of flowing toward the base end of the side surface portion of the convex portion, the outer peripheral portion of the skin is pressed against the molding surface of the concave portion, while from the gate to the gate The second molten resin that flows along the cavity terminal through the cavity corresponding to the near side surface portion is given flow resistance by the resin flow resistance applying means in the flow process, and the flow velocity is lowered, so that the second molten resin becomes It arrives at the merge point at the cavity terminal after the first molten resin, the skin is integrally joined to the surface of the base material, and the resin flow resistance is applied to the back surface of the side surface of the base material. Characterized in that to obtain a skinned, resin-molded article traces are formed by stages.

  According to a fourth aspect of the present invention, in the invention according to the third aspect, the resin flow resistance imparting means is a protruding portion formed so as to extend in the circumferential direction near the flat portion of the side surface portion of the convex portion of the core mold. In the state where the mold is closed, the cavity interval between the protruding portion and the recess corresponding to the protruding portion is narrower than the cavity interval between the flat portion of the protruding portion and the recess corresponding to the flat portion. It is characterized by that.

  According to a fifth aspect of the present invention, in the fourth aspect of the present invention, a plurality of the protruding portions are formed at intervals in the circumferential direction.

  According to the invention which concerns on Claims 1-5, flow resistance is given to the flow of the 2nd molten resin which flows along a cavity terminal via the cavity corresponding to the side part of the molded product (core type convex part) near a gate. Since the flow rate is reduced by applying the first molten resin, the first molten resin that flows directly through the flat portion toward the cavity corresponding to the side surface portion of the molded product (core-shaped convex portion) far from the gate is provided. The joining point can be reached a little earlier than the molten resin, whereby the first molten resin flows from the gate toward the end of the side surface portion of the skin, thereby bringing the end of the skin into close contact with the molding surface of the cavity mold. be able to. Also, resin flow resistance imparting means is provided near the flat portion of the side surface portion of the convex portion of the core mold, and the resin pressure is applied when the first molten resin flows from the cavity at the flat portion forming portion to the cavity at the side portion forming portion. As a result, the force that presses the side surface of the skin against the side surface of the cavity concave portion is increased, and even if the skin is not accurately molded into a regular molded product surface shape due to molding errors, etc. Can be securely adhered to the side surface of the cavity-type recess. Therefore, the molten resin does not leak out to the surface side beyond the end of the skin with the momentum of the second molten resin flowing, and the molten resin leaks to the surface side of the skin. It is possible to prevent the appearance of the resin molded product from being damaged.

  In particular, in the inventions according to claims 1 and 4, it is possible to provide a protrusion from the cavity corresponding to the flat part from the cavity corresponding to the flat part to the side part only by providing the protruding part as the resin flow resistance imparting means near the flat part of the side part of the core type convex part. The resin pressure of the first molten resin when flowing into the corresponding cavity can be increased, and leakage of the molten resin to the skin surface side can be prevented with a simple mold structure.

  Further, in the inventions according to claims 2 and 5, since the thin wall portion formed in the molded product by the protruding portion which is the resin flow resistance imparting means is formed at a plurality of intervals in the circumferential direction, the thin wall portion is formed. The thickness between the portion and the thin portion is thicker than these, and the rigidity of the molded product can be improved as compared with the case where the thin portion is continuously formed in the circumferential direction.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view of a resin-molded article 1 with a skin according to an embodiment of the present invention as seen from the front side, and FIG. 2 is a partial perspective view of the molded article 1 as seen from the back side. The resin-molded product 1 with a skin comprises a resin base material 3 constituting a molded product body and a resin skin 5 integrally joined to the surface of the base material 3 and constituting a surface layer of the resin molded product 1. The substrate 3 includes a rectangular flat portion 3a and a side surface portion 3b bent from the outer peripheral edge of the flat portion 3a to the back surface side, and is formed in a rectangular shallow dish shape as a whole. Near the flat portion 3a on the back surface of the side surface portion 3b, a plurality of first ribs 7 that are flush with the back surface of the side surface portion 3b are spaced in the circumferential direction, and the middle of the side surface portion 3b from the boundary with the flat portion 3a. The thin portion 8 formed between the first ribs 7 is thinner than the thickness of the first rib forming portion, and is spaced from the boundary with the flat portion 3a in the circumferential direction. It is formed over the middle of the side part 3b. The thickness of the thin portion forming portion is formed to be thinner than the thickness of the flat portion 3a. Also, two second ribs 9 are integrally projected in parallel on the back surface of the flat portion 3a. On the other hand, the skin 5 is also composed of a rectangular flat portion 5a and a side surface portion 5b bent from the outer peripheral edge of the flat portion 5a to the back surface side, and is formed into a rectangular shallow dish shape as a whole. It extends to near the lower end of the side surface portion 3b.

  The thin-walled portion 8 is formed with the gate 43 (corresponding to the gate 43 in FIG. 1) communicating with the cavity 13 a corresponding to the flat portion 27 b of the convex portion 27 in the core die 31 of the molding die 21 to be described later. Of the molten resin injected from the molded product 1 with a reference numeral 11), and flows through the cavity 13a corresponding to the flat portion 27b and corresponds to the side surface portion 3b far from the gate 43. Cavity 13b end of first molten resin 15 that flows directly toward cavity 13b and second molten resin 17 that flows along the end of cavity 13b through cavity 13b corresponding to side surface portion 3b close to gate 11 The flow rate of the second molten resin 17 is such that the first molten resin 15 reaches the merge point a little earlier than the second molten resin 17 at the junction. Resin that lowers and causes the outer skin 5 to press against the molding surface of the mold 21 when the first molten resin flows from the cavity 13a corresponding to the flat portion 27b of the mold 21 to the cavity 13b corresponding to the side surface portion 3b. It is a trace formed by the protrusion 19 on the mold 21 side that imparts flow resistance so as to increase the pressure, and becomes thin corresponding to the protrusion amount of the protrusion 19.

  Next, the molding die 21 shown in FIG. 3 will be described prior to the molding method of the resin molded product 1. The mold 21 is fixedly supported by a fixed plate 33 by a mounting plate 35 and a movable plate 37 so as to face the cavity die 25 by a mounting plate 39 and an ejector plate receiving block 41. The core mold 31 is provided. The cavity mold 25 has a concave portion 23 corresponding to the surface shape of the molded product, the core mold 31 has a convex portion 27 corresponding to the shape of the rear surface of the molded product, and a flat portion of the side surface portion 27a of the convex portion 27. A plurality of protrusions 19 as resin flow resistance imparting means are formed at intervals in the circumferential direction at a position close to 27b, and two ribs for forming the second rib 9 are formed on the flat portion 27b of the protrusion 27. Groove portions 29 are formed in parallel. By closing the mold 21 by bringing the core mold 31 close to the cavity mold 25, the cavity 13 for molding the molded product 1 is formed between the concave portion 23 and the convex portion 27. Further, with the mold 21 closed in this manner, the cavity interval A between the concave portion 23 of the cavity mold 25 and the convex portion 27 of the core mold 31 corresponding to the position where the protruding portion 19 of the side surface portion 27a is formed is the flat portion 27b. It is narrower than the cavity interval B between the concave portion 23 and the convex portion 27 at the formation location (see FIG. 4C). Further, a tunnel gate 43 is formed at a position corresponding to the flat portion 27 b of the convex portion 27, one end of the tunnel gate 43 communicates with the cavity 13 through the groove 29, and the other end communicates with the runner 45. It is continuous. A sprue 47 is formed in the cavity mold 25 in the mold opening direction, and one end thereof is continuous with the runner 45. Further, the other end of the sprue 47 communicates with a nozzle 49 of an injection machine (not shown) inserted in the nozzle insertion holes 33a, 35a of the fixed plate 33 and the mounting plate 35. The ejector plate housing block 41 has a housing chamber 51 in which two stacked ejector plates 53 and 55 are housed so as to be advanced and retracted by operating means (not shown). One end of an ejector pin 57 is fixed to the ejector plates 53 and 55, and the other end of the ejector pin 57 faces the cavity 13 and the runner 45. A cooling water passage 59 for circulating cooling water is provided in the cavity mold 25 and the core mold 31 in order to prevent the mold temperature from rising due to the heat effect of the high-temperature molten resin.

  Next, a method for molding the resin molded product 1 using the molding die 21 will be described with reference to FIGS. First, in a state where the mold 21 is opened, the skin 5 that has been molded into the shape of the surface of the molded product in advance is set in the recess 23 of the cavity mold 25. Next, after the mold 21 is closed, molten resin is injected into the cavity 13 formed between the concave portion 23 and the convex portion 27 from the tunnel gate 43 through the sprue 47 and the runner 45 from the nozzle 49 of the injection machine. Eject. As a result, the molten resin spreads in a ripple pattern from the tunnel gate 43 to the cavity 13a corresponding to the flat portion 3a, as shown by a one-dot chain line in FIG. Among the molten resins, the first molten resin 15 that directly flows toward the cavity 13b corresponding to the side surface portion 27a of the convex portion 27 of the core mold 31 far from the tunnel gate 43 is shown in FIG. Thus, when the cavity 13a corresponding to the flat part 27b of the convex part 27 of the core mold 31 flows and flows into the cavity 13b corresponding to the side part 27a as shown in FIG. And the cavity distance A between the flat part 27b of the convex part 27 and the flat part 23a of the concave part 23 corresponding to the flat part 27b is narrower than the cavity distance A between the flat part 27b of the convex part 27 and the flat part 23a of the concave part 23 corresponding to the flat part 27b. Therefore, in the process in which the molten resin flows toward the base end of the side surface portion 27a of the convex portion 27, the outer peripheral portion of the skin 5 is pressed against the molding surface of the concave portion 23, and the side surface portion 5b of the skin 5 is cavitated. And brought into close contact with the recess 23 of the mold 25.

  On the other hand, the fluid flows from the tunnel gate 43 to the cavity 13b corresponding to the side portion 27a far from the tunnel gate 43 along the cavity 13b terminal through the cavity 13b corresponding to the side portion 27a close to the tunnel gate 43. The second molten resin 17 is given flow resistance by the protrusions 19 in the flow process, and the flow velocity is reduced. Therefore, the second molten resin 17 arrives at the junction at the end of the cavity 13b with a delay from the first molten resin 15. That is, as shown in FIG. 4C, after the first molten resin 15 reaches the cavity 13b corresponding to the side surface portion 27a a little earlier, the second molten resin 17 joins the first molten resin 15. . Thereafter, the molten resin is cooled and solidified to form the base material 3, and the skin 5 is integrally bonded to the surface of the base material 3, and traces from the protrusions 19 are formed on the back surface of the side surface portion 3 b of the base material 3. A plurality of thin-walled portions 8 are formed at intervals in the circumferential direction, and a molded product 1 is formed in which a plurality of first ribs 7 are formed at intervals between the thin-walled portions 8.

  And although not shown in figure in the molded product 1 shape | molded as mentioned above, the solid resin solidified by the tunnel gate 43, the runner 45, and the sprue 47 adheres, and these resin solids are the mold 21. In conjunction with the mold opening operation, the ejector pins 57 are projected to be cut out from the molded product 1 simultaneously with demolding of the molded product 1 to obtain a resin molded product 1 as shown in FIG.

  Therefore, according to the present embodiment, the second molten resin 17 that flows along the end of the cavity 13b through the cavity 13b corresponding to the side surface portion 3b of the molded product 1 (the convex portion 27 of the core mold 31) close to the tunnel gate 43 is provided. Since flow resistance is imparted to the flow of gas and the flow velocity is lowered, the molded product is directed toward the cavity 13b corresponding to the side surface portion 3b of the molded product 1 (the convex portion 27 of the core mold 31) far from the tunnel gate 43. The first molten resin 15 that directly flows through the cavity 13b corresponding to the one flat portion 3a can reach the joining point a little earlier than the second molten resin 17, thereby causing the second molten resin 17 to flow. The first molten resin 15 is passed through the tunnel gate 43 before the molten resin leaks to the surface side of the surface 5 beyond the end of the skin 5 with the momentum. The resin flows to the end of the side surface portion 5b of the skin 5 and the side surface portion 5b of the skin 5 is brought into close contact with the molding surface of the cavity mold 25 to prevent the molten resin from leaking to the surface side of the skin 5 The appearance of the product 1 can be prevented from being impaired.

  Further, the protruding portion 19 is provided near the flat portion 27b of the side surface portion 27a of the convex portion 27 of the core mold 31, so that the first molten resin 15 changes from the cavity 13a where the flat portion 27b is formed to the cavity 13b where the side surface portion 27a is formed. Since the resin pressure is increased when flowing, the force for pressing the side surface portion 5b of the skin 5 against the side surface portion 23b of the concave portion 23 of the cavity mold 25 is increased. Even when the surface shape is not accurately molded, the side surface portion 5 b of the skin 5 can be securely adhered to the side surface portion 23 b of the recess 23 of the cavity mold 25. Therefore, the molten resin does not leak to the surface side beyond the end of the skin 5 due to the flow of the second molten resin 17, and the molten resin does not leak to the surface side of the skin 5. It is possible to prevent the appearance of the resin molded product 1 from being damaged.

  Further, the projection 19 is provided only near the flat portion 27b of the side surface portion 27a of the convex portion 27 of the core mold 31, so that it flows from the cavity 13a corresponding to the flat portion 27b into the cavity 13b corresponding to the side surface portion 27a. The resin pressure of the first molten resin 15 can be increased, and leakage of the molten resin to the skin surface side can be prevented with a simple mold structure.

  Moreover, since the thin part 8 formed in the molded product 1 by the protrusion 19 is formed at a plurality of intervals in the circumferential direction, the thin part 8 formed between the thin part 8 and the thin part 8 is formed. The thickness of one rib 7 is thicker than that of the thin portion 8, and the rigidity of the molded product 1 can be improved as compared with the case where the thin portion 8 is continuously formed in the circumferential direction.

  In the present embodiment, a plurality of protrusions 19 are formed in the molding die 21 with a plurality of intervals in the circumferential direction, and a thin portion 8 is formed in the molding 1 with a plurality of intervals in the circumferential direction. The protruding portion 19 may be continuously formed in the circumferential direction, and the thin portion 8 may be continuously formed in the circumferential direction.

  The present invention is useful for a resin molded article with a skin and a molding method thereof.

It is the perspective view which looked at the resin-molded article with skin which concerns on embodiment of this invention from the surface side. It is the fragmentary perspective view which looked at the resin-molded article with skin which concerns on embodiment of this invention from the back surface side. It is sectional drawing of the shaping | molding die which shape | molds the resin molded product with skin which concerns on embodiment of this invention. It is a schematic diagram which shows the process in which the 1st molten resin flows through the cavity of a shaping | molding die. FIG. 2 is a view corresponding to FIG. 1 of a conventional resin molded product with a skin. It is a figure equivalent to Drawing 4 (b) showing the process in which the conventional resin molded product with a skin is fabricated.

Explanation of symbols

1 Resin molded product
3 Base material
3a Flat part
3b Side part
5 epidermis
5a Flat part
5b Side part
8 Thin parts
11 Position corresponding to the gate of the molded product
13 cavity
15 First molten resin
17 Second molten resin
19 Protrusion
21 Mold
23 recess
25 cavity type
27 Convex
27a Side part
27b Flat part
31 Core type
43 Tunnel gate
A, B Cavity spacing

Claims (5)

It consists of a resin base material that constitutes the molded product body and a resin skin that is integrally joined to the surface of the base material and constitutes the surface layer of the molded product, and the base material is formed from a flat portion and an outer peripheral edge of the flat portion. It is a resin molded product with a skin consisting of a side surface bent to the back side,
Near the flat portion on the back surface of the side surface portion, the first melt is injected from the gate communicating with the cavity corresponding to the flat portion of the mold and flows directly toward the cavity corresponding to the side surface portion far from the gate. The first molten resin is a little faster than the second molten resin at the junction of the resin and the second molten resin that flows along the cavity terminal through the cavity corresponding to the side surface near the gate. When the flow rate of the second molten resin is decreased so as to reach the confluence, and when the first molten resin flows from the cavity corresponding to the flat portion of the mold to the cavity corresponding to the side surface, the skin is molded. Due to the protrusion on the mold side that provides flow resistance so as to increase the resin pressure pressed against the molding surface of the mold, the thinned portion corresponding to the protrusion amount of the protrusion Formed to extend in the direction, skinned, resin-molded article thickness of the thin-walled portion formed portion is characterized in that it is formed thinner than the thickness of the flat portion. In the resin molded product with a skin according to claim 1,
A thin resin part with a skin, wherein the thin part is formed with a plurality of intervals in the circumferential direction. It consists of a resin base material that constitutes the molded product body and a resin skin that is integrally joined to the surface of the base material and constitutes the surface layer of the molded product, and the base material is formed from a flat portion and an outer peripheral edge of the flat portion. A method of molding a resin-molded article with a skin consisting of a side part bent to the back side,
A cavity mold having a concave portion corresponding to the shape of the molded product surface, a convex portion corresponding to the shape of the rear surface of the molded product, a gate formed corresponding to the flat portion of the convex portion, and a side surface portion of the convex portion. Prepare a molding die consisting of a core die provided with resin flow resistance imparting means near the flat part, set a skin that has been molded in the shape of the surface of the molded product in advance in the recess of the cavity die, and close the die In this state, the molten resin is injected from the gate into the cavity formed between the concave portion and the convex portion, and the cavity corresponding to the side portion far from the gate passes through the cavity corresponding to the flat portion from the gate. When the first molten resin that flows directly toward the side flows into the cavity corresponding to the side surface portion, the first resin flow resistance is given flow resistance by the resin flow resistance applying means, and the resin pressure is increased. In the process of flowing toward the base end of the side surface portion, the outer peripheral portion of the skin is pressed against the molding surface of the recess, and on the other hand, it flows along the cavity terminal from the gate through the cavity corresponding to the side surface portion close to the gate. The second molten resin is given flow resistance by the resin flow resistance applying means in the flow process, the flow velocity is lowered, and the second molten resin arrives at the confluence at the cavity terminal with a delay from the first molten resin. A resin-molded article with a skin, characterized in that a skin-molded resin-molded article is obtained, in which a skin is integrally bonded to the surface of the substrate, and a trace by the resin flow resistance imparting means is formed on the back surface of the side surface of the substrate. Molding method. In the molding method of the resin molded product with skin according to claim 3,
The resin flow resistance imparting means is a protrusion formed so as to extend in the circumferential direction near the flat portion of the side surface portion of the convex portion of the core mold, and the protrusion and the protrusion when the mold is closed A method for molding a resin-molded article with a skin, characterized in that a cavity interval between the concave portion corresponding to the gap is narrower than a cavity interval between the flat portion of the convex portion and the concave portion corresponding to the flat portion. In the molding method of the resin molded product with skin according to claim 4,
A method for molding a resin-molded article with a skin, wherein the protrusions are formed at a plurality of intervals in the circumferential direction.

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