JP5056250B2 - Resin molded body and molding method thereof - Google Patents

Description

  The present invention relates to a resin molded body and a molding method thereof, and more particularly to a resin molded body suitable for use as a transparent panel-like member of a roof or a window of a vehicle such as an automobile, and a molding method thereof.

  JP-A-2003-320548 and JP-A-2005-103907 describe resin-made window plates for automobiles, which are made of a two-color molded product in which a peripheral edge of a transparent resin panel is formed with an opaque resin.

  FIGS. 14A and 14B are a cross-sectional view and a front view showing the two-color molded product 31 described in FIG. 1 of JP-A-2005-103907.

The two-color molded product 31 includes a transparent portion 32 formed in a rectangular flat plate shape, and a frame portion 33 integrally formed at the outer peripheral end of one surface of the front and back surfaces of the transparent portion 32. The window. In the outer peripheral portion of the transparent portion 32, the transparent portion 32 and the frame portion 33 are laminated in the thickness direction, and the central portion of the transparent portion 2 has a single layer structure in which the frame portion 33 is not laminated. The two-color molded product 31 is manufactured by two-color injection molding in which the frame portion 33 is molded with an opaque material, and then the transparent portion 32 is molded with a transparent material.
JP 2003-320548 A JP-A-2005-103907

  The present invention relates to a resin molded body in which the second resin molded body is integrally formed on a part of the surface of the first resin molded body, such as the two-color molded product of FIG. It is an object of the present invention to provide a resin molded body having a sharp (wrinkle) in the molded body and a molding method thereof.

The resin molded body according to claim 1 is a resin molded body in which a second molded body is integrally formed by injection molding on a part of the surface of the first molded body, and the surface of the first molded body is A concave line extending along an edge of the second molded body is provided , the first molded body is a plate-shaped body having a thickness of 2 to 10 mm, and the second molded body is is provided on the plate surface of the plate-like body, the first molded body is transparent in the plate plane and perpendicular, the second molded body, Ru opaque der in the plate surface direction perpendicular It is characterized by this.

The resin molded body of claim 2 is characterized in that, in claim 1, the width of the concave stripe is 0.01 to 10 mm and the depth of the concave stripe is 0.01 to 1 mm .

Resin molding of the 請 Motomeko 3 resides in that in Claim 1 or 2, the molded body of said second, which is characterized in that provided in a strip extending along the periphery of the first molded body It is.

According to a fourth aspect of the present invention, the resin molded body according to the third aspect is characterized in that the thickness of the strip-shaped second molded body on the central side of the resin molded body is smaller toward the central side of the plate.

The resin molded body according to claim 5 is the resin molded body according to claim 4 , wherein the edge of the second molded body along the concave stripe has a cross-sectional shape that is convexly curved in a cross section perpendicular to the extending direction. It is characterized by.

The resin molded body according to claim 6 is the resin molded body according to any one of claims 3 to 5 , wherein the edge of the belt-shaped second molded body on the outer edge side of the resin molded body is more than the peripheral edge of the first molded body. It is located on the center side of the plate.

A method for molding a resin molded body according to claim 7 is a method of injection molding the resin molded body according to any one of claims 1 to 6 , wherein the first mold is clamped to the fixed mold. A first molding step in which the first molded body is injection-molded using the movable mold, and the first movable mold is replaced with a second movable mold having a second molded body molding cavity, A second molding step of injection molding the second molded body integrated with the first molded body, and the second movable mold includes the first molded body and the concave strip. It is characterized by the provision of ridges for forming the.

The method for molding a resin molded body according to claim 8 is the method of molding the resin molded body according to claim 5 according to claim 7 , wherein the second movable mold is formed when the second molded body is molded. It is characterized in that it is brought into contact with the peripheral edge of one molded body.

The resin molded body according to claims 1 to 6 can be molded by the method according to claim 7 . According to this method, when the second molded body is molded, the resin for forming the second molded body is formed by forming the concave stripes on the first molded body by the second movable mold ridges. It is blocked by the ridges to prevent the resin of the second molded body from spreading out on the first molded body. As a result, the second molded body is a resin molded body having a fine finish on the edge (ie, the edge).

According to the resin molded body of the fifth aspect , the second molded body is sufficiently filled with the resin up to the end portion on the concave side during the injection molding.

According to the molding method of the eighth aspect , in the second molding step, the peripheral portion of the first molded body is pressed by the second movable mold, so that the first molded body may be warped. Is prevented.

  Hereinafter, embodiments will be described with reference to the drawings. FIG. 1A is an overall cross-sectional view of a resin molded body according to the embodiment, and FIG. 1B is an enlarged view of a part of the resin molded body. 2 to 8 are cross-sectional views showing a method for molding this resin molded body. 4 is a partially enlarged view of FIG. 3, and FIG. 8 is a partially enlarged view of FIG.

  The resin molded body 20 is a vehicle-made resin window glass, and includes a plate-shaped first molded body 21 and a frame-shaped second molded body provided so as to go around the peripheral portion of the first molded body 21. The molded body 22 is provided.

The first molded body 21 is intended thickness _{t 1} of about 2~10mm transparent, the second molded body is intended thickness _{t 2} of the opacity of about 0.5 to 5 mm.

  The second molded body 22 has a trapezoidal cross-sectional shape, and the side surface 22a facing the center of the molded body plate, that is, the center of the plate surface of the first molded body 21, is a slope. For this reason, the thickness of the second molded body 22 is smaller toward the center of the plate.

The second molded body 22 is spaced apart from the outer edge of the first molded body 21 by a distance L _3. The _{L 3} is preferably 0.1~10mm particularly 0.5~7mm especially 2 to 5 mm.

  As illustrated, the second molded body 22 is provided only on one plate surface of the first molded body 21. On the plate surface of the one plate of the first molded body 21, a concave strip 21 a is provided that extends along the edge on the center side of the second molded body 22. In this embodiment, the concave strip 21a has a substantially V-shaped cross section formed by two planar groove surfaces, but the cross section is not limited to this as described later. The V-shaped opening angle is preferably about 1 to 170 °, and more preferably about 10 to 160 °. In addition, this substantially V-shaped cross-sectional shape may have a V-shaped portion that is sharper than the angle of the entire V-shaped shape at the V-shaped tip.

  It is preferable that the edge part of the center side of the 2nd molded object 22 and the corner edge of the groove 21a correspond. Moreover, it is preferable that the groove surface of the recess 21a (the groove surface on the outer peripheral side of the resin molded body 20) and the side surface 22a of the second molded body are continuous in the same plane.

  The width w of the recess 21a is preferably 0.01 to 10 mm, particularly 1 to 5 mm, and the depth d is preferably 0.01 to 1 mm, particularly 0.02 to 0.8 mm, especially 0.05 to 0.5 mm. is there. The depth d may be uniform or non-uniform in the circumferential direction, but is preferably uniform. If the recess 21a is too large, it may be easily broken due to deformation, and conversely, if it is too small, the clarity of the resin boundary between the first molded body and the second molded body in the two-color molded body is reduced. .

  Next, a method for molding the resin molded body will be described with reference to FIGS.

  First, as shown in FIGS. 2 to 4, a transparent resin material is injected into the cavity 3 formed between the fixed mold 2 of the mold 1 and the first movable mold 11, and the first molded body 21 is injected. Is molded. In addition, on the cavity surface 11a of the first movable mold 11, a protrusion (not shown) for forming the recess 21a may protrude. In this case, the cross-sectional shape of the ridge (not shown) matches the ridge 21a.

  After molding the first molded body 21, the first movable mold 11 is opened as shown in FIG. Next, as shown in FIG. 6, the second movable mold 12 is matched, and as shown in FIGS. 7 and 8, the resin is injected into the cavity 13 formed by the second movable mold 12, and the second molded body 22 is formed. Form. The cavity 13 has a shape that matches the second molded body 22.

  As shown in FIG. 8, the second movable mold 12 is provided with a ridge 12a for forming a ridge 21a in the first molded body 21. The ridges 21 a are formed by pressing the ridges 12 a against the first molded body 21. The second movable mold 12 includes a front surface 12 b (FIG. 8) that faces the first molded body 21. The cavity 13 is recessed from the front surface 12b.

  The edge portion 12 c between the cavity 13 and the outer edge portion of the front surface 12 b of the second movable mold 12 is also in contact with the first molded body 21.

  The central portion of the front surface 12b of the second movable mold 12 and the main portion around it are recessed recesses 12d, and when the second movable mold is clamped, the portion of the recess 12d is the first portion. 1 is not brought into contact with the molded body 21. The recess 12d is provided so as to reach the vicinity of the ridge 12a. The distance (width) between the recess 12d and the cavity 13 is preferably about 1 to 100 mm, particularly about 1 to 10 mm.

  According to the molding method of the resin molded body 20 using the mold 1, the second movable mold 12 is provided with the ridge 12 a that forms the concave 21 a on the first molded body 21 as shown in FIG. 8. It has been. For this reason, the resin injected into the cavity 13 is blocked by the ridges 12 a and does not protrude into the center of the plate of the first molded body 21. As a result, the center of the second molded body 22 (kiwa), that is, the edge is finished clearly and beautifully.

  In particular, in this embodiment, the ridge 12a is configured to be in close contact with the inner surface of the first molded body 21 on the peripheral edge side of the inner surface of the recess 21a as shown in FIG. For this reason, the edge on the center side of the second molded body 22 is finished very clearly and beautifully.

Further, in this embodiment, since the first movable body 12 is in contact with the first molded body 21 including the edge portion 12c of the second movable mold 12, the first molded body 21 is warped and deformed during the molding. Is prevented. Only this edge portion 12c can be used to constitute the invention. Further, the resin for molding the second molded body 22 is prevented from spreading from the cavity 13 to the outer edge side of the resin molded body 10 (so-called reverse).
In addition, you may provide a groove like the groove 21a also in the edge part 12c. An example of the recess 21e is shown in FIG. 9 (c).

  Furthermore, in this embodiment, since the recess 12 d is provided in the second movable mold 12, the central portion of the plate of the first molded body 21 and the main part around it are in contact with the second movable mold 12. Do not touch. Therefore, damage to the first molded body 21 due to contact with the second movable mold 12 is also prevented.

In the above-described embodiment, the side surface on the plate center side of the second molded body 22 is an inclined surface. When configured in this way, the shrinkage stress of the second molded body 22 acting on the first molded body 21 is configured. Is mitigated, and a minute distortion is prevented from occurring in the first molded body 21. When using a resin molded body as a window glass for automobiles, as Fig. 1 (b), the width L ₂ of the second total width L ₁ and consisting of the slope side 22a of the molded body 22, the second molded body 22 it is desirable that the thickness t ₂ is in the following relationship.
L ₂ / t ₂ ≧ 1.75
1> L ₂ / L ₁ ≧ 0.25

The reason is as follows. That is, if the width L ₂ of the side surfaces 22a formed of slant with respect to the thickness t ₂ of the second molding 22 is too small, becomes too large the influence of the thickness direction shrinkage, the appearance appearance of the panel-shaped molded body Decreases. Further, if the width L ₂ of the inclined surface with respect to the total width L ₁ of the second molded body 22 is too small, due to the low area to absorb the effects of shrinkage appearance appearance is deteriorated due to shrinkage.

  Another embodiment will be described with reference to FIGS.

  In the above embodiment, the concave strip 21a has a V-shaped cross-sectional shape. However, as shown in FIGS. 9 (a) to 9 (c), the concave strips having an arc-shaped sectional shape as in the resin molded bodies 20A, 20B, and 20C. It is possible to provide recesses having various cross-sectional shapes, such as 21b, a convex curved recess 21c with a groove surface bulging, and a right triangular recess 21d.

  In the above embodiment, the slope 22a of the second molded body 22 is flat, but like the second molded bodies 22D and 22E of the resin molded bodies 20D and 20E in FIGS. 10 (a) and 10 (b). Alternatively, it may be a concavely curved slope 22d or a stepped slope 22e. Although not shown, it may be a convexly curved slope.

  In the present invention, as in the second molded body 22F of the resin molded body 20F in FIG. 11 (a) and a partially enlarged view of FIG. The shape may be convexly curved with a radius of curvature R. It is desirable that the edge on the center side of the second molded body 22F is in contact with the edge of the recess 21a.

  The curvature radius R of this curve is preferably about 0.1 to 10 mm, particularly about 0.5 to 10 mm, especially about 1 to 5 mm. By attaching R to the edge portion in this manner, the edge portion can be sufficiently filled with resin when the second molded body 22F is formed.

  In addition, it is preferable that the center of the curvature radius R is located inside the first molded body 21F.

The center of the radius of curvature R is preferably located within 2 · t ₂ from the surface of the first molded body 21 (the plate surface provided with the second molded body 22F). t ₂ is the thickness of the second molding body (see FIG. 1).

  As shown in FIG. 11 (b), in the cross section perpendicular to the extending direction of the concave strip 21a, the tangent at the end on the center side of the second molded body 22F preferably matches the slope of the concave strip 21a.

  In the present invention, the outer edges of the first molded bodies 21G, 21H, and 21I are the second molded bodies 22 as in the resin molded bodies 20G, 20H, and 20I of FIGS. 12 (a), (b), and (c). You may wrap around. 12A and 12C, the first molded bodies 21G and 21I cover the side surfaces of the second molded body 22. In FIG. 12 (b), there is a slight gap between the first molded body 21H and the side surface of the second molded body 22. In FIGS. 12 (b) and 12 (c), the portions around which the first molded bodies 21H and 21I wrap are thinner toward the tip side.

  The present invention can also be applied to a resin molded body 20J molded in three colors as shown in FIG. The resin molded body 20J includes a plate-shaped first molded body 211, a third molded body 213 formed on the outer peripheral side of the first molded body 211, and the first and third molded bodies 211. , 213 and a second molded body 22 formed on one plate surface. A concave strip 21 a is provided in the first molded body 211. Although the shape of the 2nd molded object 22 is the same as embodiment of FIGS. 1-8, it is not limited to this. The recess 21a extends along the edge on the plate center side of the second molded body 22.

  The molding procedure of the resin molded body 21J is as follows. First, the first molded body 211 is injection-molded with the fixed mold and the first movable mold, then the first movable mold is replaced with the third movable mold, and the third molded body 213 is molded. Next, the third movable mold is replaced with the second movable mold, and the second molded body 22 is molded. Thereafter, the resin molded body 20J is obtained by removing the mold. The third molded body 213 may be molded before the first molded body 211. The resin constituting the third molded body 213 may be transparent or opaque.

  The present invention is applicable not only to three-color molding but also to multicolor molding of four or more colors.

  Next, a material suitable when the resin molded body of the present invention is applied to an automobile window glass or the like will be described.

  If the constituent material of the 1st molded object is transparent resin, it can be suitably selected from conventionally well-known arbitrary things. Here, the term “transparent” is generally 10% or more, preferably 20% or more, more preferably 30%, as the total light transmittance in a plate-shaped molded product having a smooth surface thickness of 3 mm measured according to JIS K7105. That means that. In a transparent resin containing a dye or pigment, the proportion of the dye or pigment used is usually 0.001 to 2 parts by weight, preferably 0.005 to 120 parts by weight, with respect to 100 parts by weight of the thermoplastic resin. More preferably, it is 0.005-0.5 weight part.

  Examples of the transparent resin include polystyrene resin, high impact polystyrene resin, hydrogenated polystyrene resin, polyacryl styrene resin, ABS resin, AS resin, AES resin, ASA resin, SMA resin, polyalkyl methacrylate resin, poly Methacryl methacrylate resin, polyphenyl ether resin, polycarbonate resin, amorphous polyalkylene terephthalate resin, polyester resin, amorphous polyamide resin, poly-4-methylpentene-1, cyclic polyolefin resin, amorphous polyarylate resin, poly Heat of ether sulfone, styrene thermoplastic elastomer, olefin thermoplastic elastomer, polyamide thermoplastic elastomer, polyester thermoplastic elastomer, polyurethane thermoplastic elastomer, etc. Plastic elastomers Kyora. Among these, from the viewpoint of impact resistance and heat resistance, a polycarbonate resin (PC), particularly, an aromatic polycarbonate resin as a main constituent resin is preferable. The main constituent resin means that the ratio of the aromatic polycarbonate resin is usually 50% by weight or more, preferably 60% by weight or more, and more preferably 70% by weight or more.

  Examples of resins used in combination with PC as the main constituent resin include polystyrene resin, ABS resin, AS resin, AES resin, ASA resin, polyphenylene ether resin, polymethacryl methacrylate resin, and polyester resin. An alloy or a copolymer may be used as long as the properties are maintained.

  In addition to the above-mentioned dyes or pigments, any conventionally known auxiliary agent can be added to the constituent material of the first molded body, and examples thereof include a mold release agent, a heat stabilizer, an antioxidant, Examples include weather resistance improvers, alkali soaps, metal soaps, plasticizers, fluidity improvers, nucleating agents, flame retardants, and anti-dripping agents. The usage-amount of these adjuvants is suitably selected from a well-known range.

  The constituent material of the second molded body is not particularly limited, and various known arbitrary thermoplastic resins can be used. Specifically, for example, polycarbonate resin; thermoplastic polyester resin such as polyethylene terephthalate resin, polytrimethylene terephthalate, polybutylene terephthalate resin; polystyrene resin, high impact polystyrene resin (HIPS), acrylonitrile-styrene copolymer (AS resin) ), Styrene-based resins such as acrylonitrile-butadiene-styrene copolymer (ABS resin), acrylonitrile-styrene-acrylic rubber copolymer (ASA resin), acrylonitrile-ethylenepropylene rubber-styrene copolymer (AES resin); Polyolefin resins such as polyethylene resins and polypropylene resins; Polyamide resins; Polyimide resins; Polyether resins; Polyurethane resins; Polyphenylene ether resins; Id resins; polysulfone resins; and polymethacrylate resins and the like, which may be used in combination of two or more. Among these, PC and thermoplastic polyester resin are preferable from the viewpoint of thermal stability, rigidity, and adhesion to the design part (1), and among them, PC-based materials, particularly thermoplastic polyester resins. Use in combination is preferred.

  When a polymer alloy comprising PC and a thermoplastic polyester resin is used as the constituent material of the second molded body, the ratio of PC to the total amount of both components is usually 10 to 90% by weight.

  Preferable specific examples of the thermoplastic polyester resin used in the second molded body include polyethylene terephthalate resin (PET), polypropylene terephthalate resin (PPT), polybutylene terephthalate resin (PBT), polyhexylene terephthalate resin, polyethylene- Examples thereof include naphthalate resin (PEN), polybutylene naphthalate resin (PBN), poly (1,4-cyclohexanedimethylene terephthalate) resin (PCT), polycyclohexylcyclohexylate (PCC), and the like. Among these, polyethylene terephthalate resin (PET), polypropylene terephthalate resin (PPT), and polybutylene terephthalate resin (PBT) are preferable in terms of fluidity and impact resistance.

  As the thermoplastic polyester resin, not only a virgin raw material but also a thermoplastic polyester resin regenerated from a used product, that is, a so-called material recycled thermoplastic polyester resin can be used.

  Moreover, it is preferable to mix | blend an inorganic filler with the structural material of a 2nd molded object in order to improve rigidity, dimensional stability, and heat resistance. Examples of such inorganic fillers include titanium oxide, zinc oxide, barium sulfate, silica, calcium carbonate, iron oxide, alumina, calcium titanate, aluminum hydroxide, magnesium hydroxide, calcium carbonate, magnesium carbonate, calcium sulfate, Sodium sulfate, calcium sulfite, magnesium silicate (talc), aluminum silicate (mica), calcium silicate (wollastonite), clay, glass beads, glass powder, glass fiber, silica sand, silica, quartz powder, shirasu, keisou Examples include soil, white carbon, iron powder, and aluminum powder. Among these, magnesium silicate (talc), aluminum silicate (mica), and calcium silicate (wollastonite) are preferable. Two or more inorganic fillers can be used in combination.

  The usage-amount of an inorganic filler is 2-50 weight part normally with respect to 100 weight part of resin materials of a 2nd molded object, Preferably it is 5-40 weight part.

  Conductive carbon black and / or hollow nanocarbon fibers can be blended with the constituent material of the second molded body for the purpose of imparting antistatic properties and conductivity capable of electrostatic coating. Examples of the conductive carbon black include acetylene black obtained by thermally decomposing acetylene gas, and Ketjen black produced by crude incomplete combustion using crude oil as a raw material. Hollow nanocarbon fibers have an outer region consisting of an essentially continuous multi-layer of regularly arranged carbon atoms and an inner hollow region, with each layer and the hollow region being arranged substantially concentrically. There are essentially cylindrical fibrils. Furthermore, the regularly arranged carbon atoms in the outer region are graphite-like. The diameter of the hollow region is usually 2 to 20 nm. Such hollow nanocarbon fibers are sold by Hyperion Catharsis under the trade name “graphite fibrils” and are readily available.

  The first molded body is preferably made of non-reinforced synthetic resin, whereas the second molded body is preferably made of reinforced synthetic resin. That is, it is preferable to add reinforcing fibers to the resin material of the second molded body. As the reinforcing fiber, for example, at least one selected from the group consisting of glass fiber, carbon fiber, aromatic polyamide fiber (aramid fiber), biodegradable fiber, talc, mica, and wollastonite can be used. The weight average fiber length of the fibers is usually 1.5 to 10 mm, preferably 1.8 to 5 mm, from the viewpoint of strength and dispersibility.

  Although not shown, in the present invention, in order to mainly prevent the first molded body 21 from being damaged or deteriorated, a hard coating as a protective film may be provided. Such a hard coating is disposed on the surface opposite to the second molded body.

  The hard coating may be a single layer, but preferably has a multilayer structure of at least two layers in order to enhance the protective function. In the multilayer structure, the hardness of the outermost layer is set to the maximum. preferable. The hard coating having a multilayer structure preferably has at least one function among, for example, functional layers and primer layers of heat ray shielding, ultraviolet absorption, thermochromic, photochromic, and electrochromic.

  A transparent resin is suitable for the constituent material of the hard coating. As such a transparent resin, a known material known as a hard coat agent can be appropriately used. For example, various hard coat agents such as a chicone type, an acrylic type and a silazane type can be used. In these, in order to improve adhesiveness and a weather resistance, the 2-coat type hard coat which provides a primer layer before apply | coating a hard-coat agent is preferable. Examples of the coating method include spray coating, dip coating, flow coating, spin coating, and bar coating. Moreover, the method by a film insert, the method of apply | coating and transferring the chemical | medical agent suitable for a transfer film, etc. can also be employ | adopted.

  Chemical films having various functions (heat ray shielding, ultraviolet absorption, thermochromic, photochromic, and electrochromic functions) may be formed on the outermost layer of the hard coating.

  A transparent resin layer may be provided between the surface of the first molded body and the hard coating.

  The above-described embodiment is an example of the present invention, and the present invention may take other aspects.

  The present invention is suitable for application to windows of vehicles, particularly automobiles, and is particularly suitable for application to sunroofs, but is also applicable to quarter windows, rear windows, and the like.

It is sectional drawing of the resin molding which concerns on embodiment. It is sectional drawing which shows the shaping | molding method of the resin molding which concerns on embodiment. It is sectional drawing which shows the shaping | molding method of the resin molding which concerns on embodiment. It is sectional drawing which shows the shaping | molding method of the resin molding which concerns on embodiment. It is sectional drawing which shows the shaping | molding method of the resin molding which concerns on embodiment. It is sectional drawing which shows the shaping | molding method of the resin molding which concerns on embodiment. It is sectional drawing which shows the shaping | molding method of the resin molding which concerns on embodiment. It is sectional drawing which shows the shaping | molding method of the resin molding which concerns on embodiment. It is sectional drawing of the resin molding which concerns on another embodiment. It is sectional drawing of the resin molding which concerns on another embodiment. It is sectional drawing of the resin molding which concerns on another embodiment. It is sectional drawing of the resin molding which concerns on another embodiment. It is sectional drawing of the resin molding which concerns on another embodiment. It is explanatory drawing of a prior art example.

1 Mold 11 First movable mold 12 Second movable mold 20, 20A-20J Resin molded body 21, 21A, 21B, 21C, 21F-21I, 211 First molded body 22, 22D, 22E, 22F Second Molded body 213 Third molded body 21a, 21b, 21c, 21d, 21e

Claims (8)

In the resin molded body in which the second molded body is integrally formed by injection molding on a part of the surface of the first molded body,
A concave line extending along an edge of the second molded body is provided on the surface of the first molded body ,
The first molded body is a plate-shaped body having a thickness of 2 to 10 mm, and the second molded body is provided on a plate surface of the plate-shaped body,
The first molded body is transparent in a direction perpendicular to the plate surface;
Said second molded body, the resin molded body, wherein the opaque der Rukoto in the plate plane and perpendicular.   In Claim 1, The width | variety of the said groove is 0.01-10 mm, and the depth of a groove is 0.01-1 mm, The resin molding characterized by the above-mentioned. 3. The resin molded body according to claim 1 , wherein the second molded body is provided in a strip shape extending along a peripheral edge of the first molded body. 4. The resin molded body according to claim 3 , wherein the thickness of the resin molded body plate center side of the belt-shaped second molded body is smaller toward the plate center side. 5. The resin molded body according to claim 4 , wherein the edge portion of the second molded body along the concave stripe has a cross-sectional shape that is convexly curved in a cross section perpendicular to the extending direction. The edge part on the resin molded body outer edge side of the belt-shaped second molded body according to any one of claims 3 to 5 is located closer to the center of the plate than the peripheral edge of the first molded body. A resin molded product characterized by that. A method for injection molding the resin molded body according to any one of claims 1 to 6 ,
A first molding step of injection molding the first molded body using a fixed mold and a first movable mold clamped to the fixed mold;
The first movable mold is replaced with a second movable mold having a second molded body molding cavity, and the second molded body integrated with the first molded body is injection molded. 2 molding processes,
The method of molding a resin molded body, wherein the second movable mold is provided with protrusions for forming the recesses on the first molded body. According to claim 7, and a method for molding the resin molded body according to claim 5, when forming said second molded body, are brought into contact with the second movable mold the peripheral portion of the first molded body A molding method for a resin molded body, characterized by comprising:

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