JP2012143890A - Two-color molding resin window and method of manufacturing the two-color molding resin window - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a two-color molding resin window enabling suppression of decline in appearance quality.SOLUTION: The two-color molding resin window 1 includes: a first resin molded body 10 formed to have a panel shape by injection molding and having transparency; and a second resin molded body 20 integrated with the back face 10B of the first resin molded body 10 by injection molding, having opacity or translucency and assisting the first resin molded body 10. On the surface 10A of the first resin molded body 10, step parts 51, 52, 53, 54 are formed on a joining region E2 where the first resin molded body 10 and the second resin molded body 20 are overlapped with each other to extend along a boundary G between a transparent region E1 constituted only by the first resin molded body 10 and the joining region E2.

Description

  The present invention relates to a two-color molded resin window and a method for manufacturing a two-color molded resin window.

  Patent Document 1 discloses a conventional two-color molded resin window. The two-color molded resin window is attached to, for example, a vehicle roof, and includes a first resin molded body having transparency and a second resin molded body having transparency. The first resin molded body is indicated by reference numeral 21 in FIG. The second resin molded body is indicated by reference numeral 22 in FIG.

  The first resin molded body is formed into a panel shape by injection molding. The second resin molded body is integrated by forming a frame shape at the outer peripheral edge portion on the back surface of the first resin molded body by injection molding to assist the first resin molded body.

  On the back surface of the first resin molded body, the boundary between the bonding area and the transparent area, which is an area where the first resin molded body and the second resin molded body overlap, on the transparent area that is the area of only the first resin molded body. A groove extending along the line is formed. The recess is indicated by reference numeral 21a in FIG.

  After the first resin material is injected into the first cavity and the first resin molded body is molded, the concave stripe is formed on the movable mold constituting the second cavity while holding the first resin molded body in the second cavity. It is formed by pushing the projected ridge into the back surface of the first resin molded body. Then, when the second resin material is injected into the second cavity to mold the second resin molded body, the second resin material is dammed by the ridges, so that the boundary between the joining region and the transparent region, that is, the second The burr is prevented from protruding from the inner peripheral edge of the resin molded body.

JP 2009-39876 A

  By the way, the thickness of the conventional two-color molded resin window varies greatly between the transparent region and the bonding region. For this reason, as a general characteristic of two-color molding, minute folds and sink marks may occur near the boundary between the transparent region and the bonding region on the surface of the first resin molded body. And, when seeing the vicinity of the boundary from the front surface side or the back surface side of the first resin molded body, or when looking at the reflected image reflected on the surface of the first resin molded body, if a minute fold or sink mark near the boundary is noticeable, It is easily recognized as a distortion of the visual field or a distortion of the reflected image, and the appearance quality is deteriorated.

  Further, in this two-color molded resin window, the concave stripe is on the transparent region. For this reason, when looking ahead through the transparent region from the front surface side or the back surface side of the first resin molded body, the appearance quality deteriorates even if the concave stripe narrows the view or distorts it.

  This invention is made | formed in view of the said conventional situation, Comprising: It is the problem which should be solved to provide the 2 color molding resin window which can suppress the fall of an external appearance quality.

The two-color molded resin window of the present invention is formed into a panel shape by injection molding, and has a first resin molded body having transparency,
A second resin molded body that is integrated with the back surface of the first resin molded body by injection molding and assists the first resin molded body while having opacity or translucency;
On the surface of the first resin molded body, on the bonding area where the first resin molded body and the second resin molded body overlap, a transparent area which is an area only of the first resin molded body and the A step portion extending along the boundary with the joining region is formed (claim 1).

  In the two-color molded resin window of the present invention, the second resin molded body is integrated with the back surface of the first resin molded body, and the second resin molded body assists the first resin molded body. Therefore, the two-color molded resin window has the function of the second resin molded body in addition to the function of the first resin molded body. For example, if the second resin molded body reinforces the first resin molded body, the strength and rigidity of the two-color molded resin window are improved.

  In the two-color molded resin window, the first resin molded body has transparency, while the second resin molded body has opacity or translucency. For this reason, from the front side or the back side of the first resin molded body, through the transparent region, which is the region of only the first resin molded body, the tip can be well seen, while the first resin molded body and the first resin molded body It is difficult to see the point through the joining region, which is the region where the two resin moldings overlap. For this reason, the connection structure given to the 2nd resin fabrication object and the member connected with them can be concealed. In addition, as a specific configuration of the second resin molded body having opacity or translucency, for example, in addition to the configuration in which the entire second resin molded body is molded of a material having opacity or translucency, A configuration in which an opaque or translucent film or the like is attached to a main body formed of a transparent material can be employed.

  Furthermore, as a general characteristic of two-color molding, minute creases and sink marks may occur near the boundary between the transparent region and the bonding region on the surface of the first resin molded body. Minute breaks and sink marks in the vicinity of the boundary are more likely to occur on the joint region than on the transparent region. In this respect, in this two-color molded resin window, the stepped portion formed on the surface of the first resin molded body extends along the boundary between the transparent region and the bonded region on the bonded region. For this reason, the stepped portion is easily conspicuous as a design line along the boundary, while minute folds and sink marks in the vicinity of the boundary are covered with the stepped portion and become relatively inconspicuous. For this reason, when seeing the vicinity of the boundary from the front surface side or the back surface side of the first resin molded body, or when viewing the reflected image reflected on the surface of the first resin molded body, minute folds and sink marks near the boundary are covered with the stepped portion. Thus, it becomes difficult to be recognized as the distortion of the visual field or the distortion of the reflected image.

  Further, in this two-color molded resin window, the step portion is on the joining region. For this reason, when seeing through the transparent region from the front surface side or the back surface side of the first resin molded body, the stepped portion does not narrow or distort the field of view.

  Therefore, according to the two-color molded resin window of the present invention, it is possible to suppress a decrease in appearance quality.

  As a specific example of the stepped portion, a convex portion that swells from the front surface to the opposite side of the back surface. A concave portion that is recessed from the front surface to the back surface side, an inclined portion that is inclined from the transparent region side toward the bonding region side, and a wave portion that undulates from the transparent region side toward the bonding region side.

  Specific examples of the members connected to the connection structure provided to the second resin molded body include a vehicle body frame constituting a roof and a window frame in a vehicle, a guide frame for a sunshade, a window frame for a house, and the like.

  In the two-color molded resin window of the present invention, it is preferable that the second resin molded body is integrated in a frame shape with the outer peripheral edge portion on the back surface of the first resin molded body.

  In this case, the frame-shaped second resin molded body 20 reliably assists the first resin molded body 10. For example, if the frame-shaped second resin molded body reinforces the first resin molded body, the strength and rigidity of the two-color molded resin window are surely improved. In addition, since a plurality of connection structures can be provided along the frame-shaped second resin molded body, the connection between the two-color molded resin window and the vehicle body frame, the sunshade guide frame, the housing window frame, and the like is surely performed. Can do. Moreover, the vehicle body frame connected to the two-color molded resin window, the guide frame of the sunshade, the window frame of the house, and the like can be suitably concealed.

  It is preferable that the two-color molded resin window of the present invention is attached to the roof of the vehicle, the first resin molded body is located outside the vehicle, and the second resin molded body is located inside the vehicle. ).

  When the two-color molded resin window of the present invention is used as a roof window for a vehicle, generally, the surface of the first resin molded body is a substantially smooth surface having a large area. For this reason, if minute folds or sink marks that may occur in the vicinity of the boundary between the transparent region and the joining region become conspicuous, it is easily recognized as distortion of the field of view or distortion of the reflected image, and the appearance of the entire vehicle roof The quality will deteriorate. In this regard, according to the two-color molded resin window of the present invention, minute folds and sink marks near the boundary are covered with the stepped portion and become relatively inconspicuous, so that deterioration of the appearance quality of the entire roof can be suppressed.

  In the above case, the surface of the first resin molded body is preferably inclined so that the transparent region side is high and the bonding region side is low, and the stepped portion is lowered from the transparent region side toward the bonding region side ( Claim 4).

  In this case, it is difficult for water droplets such as rain to accumulate in the transparent region and the stepped portion. For this reason, the visibility of the two-color molded resin window is hardly obstructed by the water droplets, and it is possible to suppress the occurrence of water scale on the surface of the two-color molded resin window.

The method for manufacturing a two-color molded resin window according to the present invention includes a first injection molding step of molding a first resin molded body having a panel shape by injecting a first resin material into a first cavity. When,
By injecting the second resin material while holding the first resin molded body in the second cavity, the first resin molded body is integrated with the back surface of the first resin molded body and has the opaqueness or translucency. A second injection molding step of molding a second resin molding that assists the resin molding,
In the first injection molding step, only the first resin molded body is formed on a bonding region where the first resin molded body and the second resin molded body overlap each other on the surface of the first resin molded body. A step portion extending along a boundary between the transparent region as a region and the joining region is formed (Claim 5).

  In the method for manufacturing a two-color molded resin window according to the present invention, the step portion described above is formed on the surface of the first resin molded body in the first injection molding step. For this reason, in the produced two-color molded resin window, minute folds and sink marks that may occur in the vicinity of the boundary between the transparent region and the joint region are covered with the stepped portion and become relatively inconspicuous, and the field of view distortion or reflected image It becomes difficult to be recognized as a distortion.

  Therefore, according to the method for manufacturing a two-color molded resin window of the present invention, it is possible to manufacture a two-color molded resin window capable of suppressing deterioration in appearance quality.

  In the two-color molded resin window manufacturing method of the present invention, in the second injection molding step, it is preferable to hold the second resin molding material until the second resin molding material is solidified (Claim 6).

  Generally, if no pressure is maintained in the second injection molding step, the second resin is caused by a change in the thickness of the injection gate for the second resin molded body or the connection structure provided to the second resin molded body. There is a possibility that local sink marks may occur in the molded body. And when the influence reaches the surface of the 1st resin molding integrated with this 2nd resin molding, there exists a possibility that a local dent may occur on the surface of the 1st resin molding. This local dent is easily recognized as a distortion of the reflected image when a reflected image reflected on the surface of the first resin molding is viewed, and the appearance quality is degraded.

  On the other hand, according to the manufacturing method of the present invention, local sinking of the second resin molded body is less likely to occur by holding pressure in the second injection molding step. For this reason, local dents are less likely to occur on the surface of the first resin molded body, and are hardly recognized as distortion of the reflected image.

  However, if pressure is maintained in the second injection molding step, as a general characteristic of two-color molding, minute creases and sink marks are likely to occur near the boundary between the transparent region and the joining region. That is, molding conditions that suppress local dents on the surface of the first resin molded body due to local sink marks on the second resin molded body, and generation of minute creases and sink marks near the boundary between the transparent region and the joining region This is contrary to the molding conditions for suppressing the above.

  In this regard, according to the manufacturing method of the present invention, the step portion formed on the surface of the first resin molded body extends along the boundary between the transparent region and the bonding region on the bonding region. For this reason, even if it becomes easy to generate minute folds and sink marks near the boundary by holding pressure in the second injection molding process, the stepped portion is easily noticeable as a design line along the boundary. Sink marks are relatively inconspicuous because of the gap between the step portions, and are difficult to recognize as distortion of the visual field or distortion of the reflected image.

  As a result, according to this manufacturing method, it is possible to manufacture a two-color molded resin window capable of suppressing deterioration in appearance quality.

It is a perspective view of the roof of a vehicle to which the two-color molded resin window of the embodiment and the two-color molded resin window are attached. It is a perspective view of the sun shade connected with the two-color molding resin window of an Example, and a two-color molding resin window. 1A is a main part enlarged cross-sectional view showing the AA cross section of FIG. 1, and FIG. 1B is a main part enlarged view showing the B-B cross section of FIG. 1. It is sectional drawing, (c) is a principal part expanded sectional view which shows a level | step difference part. (A) And (b) is explanatory drawing explaining a 1st injection molding process in connection with the 2 color molding resin window of an Example. (A) And (b) is explanatory drawing explaining a 2nd injection molding process in connection with the two-color molding resin window of an Example. It is a principal part expanded sectional view which concerns on the 2 color molding resin window of the modification 1, and shows a level | step difference part. It is a principal part expanded sectional view which concerns on the 2 color molding resin window of the modification 2, and shows a level | step difference part. It is a principal part expanded sectional view which concerns on the 2 color molding resin window of the modification 3, and shows a level | step difference part. It is a principal part expanded sectional view which concerns on the 2 color molding resin window of the modification 4, and shows a level | step difference part. It is a perspective view of the roof of the vehicle explaining the example which changed the shape of the 2nd resin molding concerning the two-color molding resin window of an Example.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below with reference to the drawings.

(Example)
As shown in FIG. 1, the two-color molded resin window 1 of the embodiment is attached to a vehicle roof 2 to constitute a fixed sunroof. As shown in FIG. 2, an openable sunshade 3 is attached to the two-color molded resin window 1 from below.

  The two-color molded resin window 1 is manufactured by two-color molding, which will be described in detail later. As shown in FIGS. 3A and 3B, the first resin molded body 10 and the second resin molded body 1 are formed. And a body 20.

  As shown in FIGS. 1 to 3, the first resin molded body 10 has a panel shape, and is located outside the vehicle in a state where the two-color molded resin window 1 is attached to the roof 2. The surface 10A of the first resin molded body 10 is a substantially smooth surface having a large area.

  The 1st resin molding 10 consists of the 1st resin material which has transparency. In this embodiment, polycarbonate resin (PC) is adopted as the first resin material from the viewpoints of impact resistance, heat resistance, weather resistance, and the like. The first resin material can be appropriately selected from various known thermoplastic resin materials as long as it is a colored transparent resin material or a colorless transparent resin material. Specifically, polycarbonate resin, polystyrene resin, polyacryl styrene resin, ABS resin, AS resin, AES resin, ASA resin, SMA resin, polyalkyl methacrylate resin, polymethacryl methacrylate resin, polyphenyl ether resin, polyester resin, etc. Can be mentioned. Moreover, auxiliary agents, such as a coloring agent, a heat stabilizer, antioxidant, a weather resistance improving agent, or a flame retardant, may be added to the 1st resin material, for example.

  The second resin molded body 20 is formed in a frame shape, and is located inside the vehicle when the two-color molded resin window 1 is attached to the roof 2. As shown in FIGS. 3A and 3B, the second resin molded body 20 is integrated with the outer peripheral edge portion 10 </ b> C on the back surface 10 </ b> B of the first resin molded body 10.

  The second resin molded body 20 is made of a second resin material having opacity or translucency. In this embodiment, in order to improve the strength, rigidity, concealability, etc., a polycarbonate resin (PC) in which glass fiber or carbon black is blended is employed as the second resin material having opacity. The second resin material can be appropriately selected from various known thermoplastic resin materials as long as it is an opaque resin material or a translucent resin material. Specifically, the above-described thermoplastic resin exemplified as the first resin material is blended with various known reinforcing fibers, fillers, colorants, auxiliaries, etc. to obtain a translucent resin material or an opaque resin material. be able to. For example, by blending an inorganic filler, rigidity, dimensional stability, heat resistance, and the like can be improved. Further, by adding carbon black, the opacity and antistatic properties can be improved. Furthermore, strength, rigidity, dimensional stability, etc. can be improved by blending reinforcing fibers. Further, as the second resin material, a resin material having transparency similar to that of the first resin material can be selected. In that case, by pasting a film having opacity or translucency on the front or back surface of the second resin molded body, or by sandwiching a similar film between the first resin molded body and the second resin molded body, Opacity or translucency is added to the second resin molding.

  The second resin molded body 20 is integrated with the first resin molded body 10 to assist the first resin molded body 10. For this reason, the two-color molded resin window 1 has the function of the second resin molded body 20 in addition to the function of the first resin molded body 10. Specifically, since the second resin molded body 10 having higher strength and rigidity than the first resin molded body 10 reinforces the first resin molded body 10, the two-color molded resin window 1 has strength and rigidity. It has improved.

  As shown in FIGS. 1-3, the area | region only of the 1st resin molding 10 is the transparent area | region E1. Since the first resin molded body 10 has transparency, it is possible to see through the transparent area E1 from the front surface 10A side or the back surface 10B side of the first resin molded body 10.

  A region where the first resin molded body 10 and the second resin molded body 20 overlap is a bonding region E2. Since the second resin molded body 20 is opaque, it is not possible to see the tip of the first resin molded body 10 from the front surface 10A side or the back surface 10B side through the bonding region E2. In FIG. 1, the frame-shaped joining region E2 is shaded. In FIG. 2, in order to explain the connection portions 25 </ b> A and 25 </ b> B integrally formed with the second resin molded body 20, the joining region E <b> 2 is partially shaded. A boundary G between the transparent region E1 and the joining region E2 extends so as to draw a substantially square shape.

  As shown in FIGS. 3A and 3B, the inner peripheral edge 20 </ b> D of the second resin molded body 20 tapers toward the boundary G. Thereby, the thickness change of the two-color molded resin window 1 in the vicinity of the boundary G is alleviated. The outer peripheral edge of the back surface 20B of the second resin molded body 20 is bonded to the frame-shaped ceiling frame 2A by applying the adhesive 23 over the entire periphery. Thus, the two-color molded resin window 1 is securely attached to the roof 2 by bonding the second resin molded body 20 having a higher strength and rigidity than the first resin molded body 10 and the ceiling frame 2A. be able to. The second resin molded body 20 and the ceiling frame 2A may be fastened with a set screw or the like. Although not shown, a window molding is mounted between the outer peripheral edge of the first resin molded body 10 and the ceiling frame 2A.

  As shown in FIGS. 2 and 3B, a plurality of connection portions 25A and 25B projecting downward in a rib shape or a boss shape are integrally formed on the back surface 20B of the second resin molded body 20. . As shown in FIG. 2, the connecting portions 25 </ b> A and 25 </ b> B are arranged in a substantially “U” shape along the left side, the right side, and the rear side of the second resin molded body 20. On the other hand, the sunshade 3 includes a substantially “U” -shaped guide frame 3A along the left side, right side, and rear side of the second resin molded body 20 and a shade body 3B that is guided by the guide frame 3A and slides back and forth. Has been. As shown in FIG. 3B, the back surface of the second resin molded body 20 is brought into contact with the plurality of connecting portions 25A and 25B by bringing the guide frame 3A into contact from below and fastening them together with a fastener 3C. The guide frame 3A can be reliably fixed to 20B.

  In FIG. 2, the shade body 3B is slid back and folded. Although illustration is omitted, the transparent body E1 can be shielded from the vehicle interior by unfolding in a substantially flat shape by sliding the shade body 3B forward.

  As shown in FIGS. 3A and 3B, the adhesive 23, the connecting portions 25A and 25B, and the guide frame 3A are provided on the back surface 20B of the second resin molded body 20 having transparency, that is, below the joining region E2. Is located. Thereby, the adhesive 23, the connecting portions 25A and 25B, and the guide frame 3A are not visible from the surface 10A side of the first resin molded body 10, and are preferably concealed. In addition, although illustration is abbreviate | omitted, the ceiling trim by which the site | part facing the transparent area | region E1 was notched in the substantially rectangular shape is mounted in a vehicle interior.

  As shown in an enlarged view in FIG. 3C, a step portion 51 is formed on the surface 10 </ b> A of the first resin molded body 10. The step portion 51 extends on the joining area E2 so as to draw a substantially square shape along the boundary G between the transparent area E1 and the joining area E2.

  The surface 10A of the first resin molded body 10 is high on the transparent region E1 side and low on the bonding region E2 side. And the level | step-difference part 51 inclines so that it may go down toward the joining area | region E2 side from the transparent area | region E1 side. Thereby, in a state where the two-color molded resin window 1 is attached to the roof 2, it is difficult for water droplets such as rain to collect in the transparent region E <b> 1 and the step portion 51. For this reason, the visibility of the two-color molded resin window 1 is not easily obstructed by water droplets, and it is possible to suppress the occurrence of scales on the surface of the two-color molded resin window 1. The stepped portion 51 has a width and an inclination angle so that the stepped portion 51 is easily noticeable as a design line along the boundary G.

  Next, a method for manufacturing the two-color molded resin window 1 will be described. This manufacturing method includes a first injection molding step and a second injection molding step described below.

  As shown in FIG. 4A, in the first injection molding process, first, the first cavity C1 is defined. The first cavity C1 is a combination of a fixed mold 90 and a first movable mold 91. The molding surface 90A of the fixed mold 90 has a shape obtained by inverting the surface 10A of the first resin molding 10. An inverted stepped portion 90B obtained by inverting the stepped portion 51 is also formed on the molding surface 90A. On the other hand, the molding surface 91 </ b> A of the first movable mold 91 has a shape obtained by inverting the back surface 10 </ b> B of the first resin molded body 10.

  And as shown in FIG.4 (b), the panel-shaped 1st resin molding 10 in which the level | step-difference part 51 was formed in the surface 10A is shape | molded by inject | pouring the 1st resin material mentioned above into the 1st cavity C1. Is done. Although not shown, the injection gate of the first cavity C1 is generally provided on the outer peripheral edge of the first resin molded body 10.

  As shown in FIG. 5A, in the second injection molding process, first, the second cavity C2 is defined. The second cavity C2 is formed by combining a fixed mold 90 and a second movable mold 92. That is, after the first injection molding step, the first movable mold 91 is released from the back surface 10B of the first resin molded body 10 while the first resin molded body 10 is held on the molding surface 90A of the fixed mold 90. The second cavity C2 is partitioned by combining the second movable mold 92 and the fixed mold 90. The fixed mold 90, the first movable mold 91, and the second movable mold 92 are actually upside down.

  The molding surface 92A of the second movable mold 92 has a shape obtained by inverting the back surface 20B of the second resin molded body 20 in the region F2 corresponding to the joining region E2, and the first surface in the region F1 corresponding to the transparent region E1. It is the shape which reversed the back surface 10B of the resin molding 10. FIG.

  And as shown in FIG.5 (b), by inject | pouring the 2nd resin material mentioned above into the 2nd cavity C2, a frame shape is made | formed and integrated with the outer peripheral edge part 10C in the back surface 10B of the 1st resin molding 10. The second resin molded body 20 is formed. At this time, the injection pressure by the injection molding machine is increased to hold the second resin molding material until the second resin molding material in the second cavity C2 is solidified.

  Although illustration is omitted, the injection gate of the second cavity C2 is provided in the region F2 on the molding surface 92A. For this reason, as shown to Fig.3 (a), in the back surface 20B of the 2nd resin molding 20, the injection part 20C corresponding to an injection gate is formed.

  Then, after the second resin molding material in the second cavity C2 is solidified, the two-color molding resin window 1 is released by releasing the two-color molding resin window 1 from the fixed mold 90 and the second movable mold 92. Complete. At the product stage, the injection unit 20C is removed.

  Here, if no pressure is maintained in the second injection molding step, as shown in FIGS. 3A and 3B, for example, due to changes in the thickness of the injection portion 20C and the connection portions 25A and 25B, for example, There is a possibility that local sink marks may occur at the portions indicated by arrows P2, P3, and P4 of the second resin molded body 20. If such a local sink occurs, the influence on the surface 10A of the first resin molded body 10 integrated with the second resin molded body 20 affects the arrow on the surface 10A. There exists a possibility that a local dent may generate | occur | produce in the site | part shown by P2, P3, and P4. This local dent is easily recognized as a distortion of the reflected image when a reflected image reflected on the surface 10A is viewed, and the appearance quality of the two-color molded resin window 1 is deteriorated.

  On the other hand, in this embodiment, by holding the pressure in the second injection molding step, local sink marks are less likely to occur at the portions indicated by the arrows P2, P3, and P4 of the second resin molded body 20. For this reason, it becomes difficult to generate a local dent also in the site | part shown by arrow P2, P3, P4 of 10 A of surfaces. For this reason, when the reflected image reflected in the vicinity of the part indicated by the arrows P2, P3, and P4 on the surface 10A is viewed with the two-color molded resin window 1 attached to the roof 2, it is difficult to recognize the distortion of the reflected image.

  Further, in the two-color molded resin window 1 obtained by the above manufacturing method, due to the general characteristics of two-color molding, as shown by the two-dot chain line in FIGS. The transparent region E1 side tends to be deformed so as to hang downward with respect to the bonding region E2 side. In this case, minute breaks and sink marks are likely to occur at the site indicated by the arrow P1 near the boundary G.

  Further, while holding pressure in the second injection molding step, the compressive force in the thickness direction due to holding pressure acts on the first resin molded body 10 in the joining region E2, while in the transparent region E1, the compressive force in the thickness direction due to holding pressure. Does not act on the first resin molded body 10. Due to the molding conditions for holding pressure, the tendency of the transparent region E1 side of the first resin molded body 10 to be deformed so as to hang downward with respect to the bonding region E2 side is increased. If it does so, it will become easy to generate | occur | produce a minute crease and sink marks in the site | part shown by the arrow P1 of the boundary G vicinity.

  That is, molding conditions for suppressing local dents (see arrows P2, P3, and P4) of the surface 10A due to local sinks of the second resin molded body 20, and minute folds and sink marks (arrow P1) near the boundary G This is contrary to the molding conditions that suppress the occurrence of

  And this 2 color molding resin window 1 is attached to the roof 2, and the surface 10A located in the outer side of a vehicle is made into the substantially smooth surface with a large area. For this reason, if minute folds or sink marks that may occur in the vicinity of the boundary G are noticeable, the field of view is viewed when the vicinity of the boundary G is seen from the front surface 10A side or the back surface 10B side, or when a reflected image reflected on the front surface 10A is viewed. And the appearance quality of the two-color molded resin window 1 deteriorates. As a result, the appearance quality of the entire roof 2 is also lowered.

  In this regard, the two-color molded resin window 1 is formed on the surface 10A in the first injection molding step even if minute folding and sink marks near the boundary G are likely to occur by holding pressure in the second injection molding step. The stepped portion 51 extends along the boundary G on the bonding region E2. For this reason, the stepped portion 51 is easily conspicuous as a design line along the boundary G, while minute folds and sink marks in the vicinity of the boundary G are covered with the stepped portion 51 and become relatively inconspicuous. For this reason, when seeing the vicinity of the boundary G from the front surface 10A side or the back surface 10B side, or when viewing a reflected image reflected on the front surface 10A, minute folds or sink marks in the vicinity of the boundary G are covered by the step portion 51, and distortion of the field of view or It becomes difficult to recognize the distortion of the reflected image.

  Further, in the two-color molded resin window 1, the stepped portion 51 is on the joining region E2. For this reason, when looking through the transparent region E1 from the surface 10A side, the stepped portion 51 does not narrow or distort the field of view.

  Therefore, according to the two-color molded resin window 1 of the embodiment, it is possible to suppress a decrease in appearance quality. Moreover, according to the manufacturing method of an Example, the 2 color molding resin window 1 which can suppress the fall of an external appearance quality can be manufactured. As a result, the deterioration of the appearance quality of the entire roof 2 of the vehicle can also be suppressed.

(Modification 1)
As shown in FIG. 6, the two-color molded resin window of Modification 1 is obtained by adding a back-side step 251 to the back surface 10 </ b> B of the first resin molded body 10 of the example. Other configurations of the two-color molded resin window of Modification 1 are the same as those of the two-color molded resin window 1 of the embodiment. For this reason, about the same structure, the same code | symbol is attached | subjected and description is abbreviate | omitted or simplified.

  On the back surface 10B of the first resin molded body 10, a back surface side step portion 251 that faces the step portion 51 on the front surface 10A side is formed. Similarly to the stepped portion 51, the back-side stepped portion 251 also extends along the boundary G so as to draw a substantially square shape on the joining region E <b> 2. The back surface 10B is high on the transparent region E1 side and low on the bonding region E2 side. And the back surface side level | step-difference part 251 inclines so that it may go down toward the joining area | region E2 side from the transparent area | region E1 side.

  Similarly to the two-color molded resin window of the example, the two-color molded resin window of Modification 1 having such a configuration can also suppress a decrease in appearance quality.

(Modifications 2 to 4)
As shown in FIGS. 7 and 9, in the two-color molded resin windows of the modified examples 2 to 4, the step portion 51 of the embodiment is changed to step portions 52, 53 and 54. Other configurations of the two-color molded resin windows of the modified examples 2 to 4 are the same as the two-color molded resin window 1 of the embodiment. For this reason, about the same structure, the same code | symbol is attached | subjected and description is abbreviate | omitted or simplified.

  As shown in FIG. 7, in the two-color molded resin window of Modification 2, a stepped portion 52 is formed on the surface 10 </ b> A of the first resin molded body 10. The step portion 52 extends on the joining area E2 so as to draw a substantially square shape along the boundary G between the transparent area E1 and the joining area E2. The stepped portion 52 has a convex shape that swells from the front surface 10A to the opposite side of the back surface 10B.

  As shown in FIG. 8, in the two-color molded resin window of Modification 3, a stepped portion 53 is formed on the surface 10 </ b> A of the first resin molded body 10. The stepped portion 53 extends on the joining region E2 so as to draw a substantially square shape along the boundary G between the transparent region E1 and the joining region E2. The step portion 53 has a concave shape that is recessed from the front surface 10A to the back surface 10B side.

  As shown in FIG. 9, in the two-color molded resin window of Modification 4, a stepped portion 54 is formed on the surface 10 </ b> A of the first resin molded body 10. The step portion 54 extends on the joining area E2 so as to draw a substantially square shape along the boundary G between the transparent area E1 and the joining area E2. The step portion 54 is inclined so as to rise from the transparent region E1 side toward the bonding region E2 side.

  In the two-color molded resin windows of the modified examples 2 to 4 having such a configuration, it is possible to suppress the deterioration of the appearance quality by the step portions 52, 53, and 54, similarly to the two-color molded resin window of the embodiment.

  In the above, the present invention has been described with reference to Examples and Modifications 1 to 4. However, the present invention is not limited to the above Examples and Modifications 1 to 4, and may be appropriately selected without departing from the scope of the present invention. Needless to say, it can be changed and applied.

  For example, as illustrated in FIG. 10, the second resin molded body 20 includes not only the outer peripheral edge portion 10 </ b> C on the back surface 10 </ b> B of the first resin molded body 10, but also a reinforcing portion 4 that further reinforces the center of the first resin molded body 10. The shape may be provided. In that case, the step portion 51 is formed along all the boundaries G between the transparent region E1 and the bonding region E2 on the bonding region E2.

  The present invention can be used for vehicles such as automobiles, houses, and the like.

DESCRIPTION OF SYMBOLS 1 ... Two-color molding resin window 2 ... Vehicle roof 10 ... 1st resin molding 20 ... 2nd resin molding 10A ... The surface of 1st resin molding 10B ... The back surface of 1st resin molding 10C ... 1st resin molding Outer peripheral edge portion on the back surface of the body E1 ... transparent region E2 ... joining region G ... between transparent region and joining region 51, 52, 53, 54 ... stepped portion C1 ... first cavity C2 ... second cavity

Claims (6)

A first resin molded body formed into a panel shape by injection molding and having transparency;
A second resin molded body that is integrated with the back surface of the first resin molded body by injection molding and assists the first resin molded body while having opacity or translucency;
On the surface of the first resin molded body, on the bonding area where the first resin molded body and the second resin molded body overlap, a transparent area which is an area only of the first resin molded body and the A two-color molded resin window, characterized in that a step portion extending along a boundary with a joining region is formed.   2. The two-color molded resin window according to claim 1, wherein the second resin molded body is integrated in a frame shape with an outer peripheral edge portion on the back surface of the first resin molded body.   3. The two-color molded resin window according to claim 2, wherein the two-color molded resin window is attached to a roof of a vehicle, wherein the first resin molded body is positioned outside the vehicle, and the second resin molded body is positioned inside the vehicle. The surface of the first resin molded body is high on the transparent region side and low on the bonding region side,
The two-color molded resin window according to claim 3, wherein the stepped portion is inclined so as to descend from the transparent region side toward the bonding region side. By injecting the first resin material into the first cavity, a first injection molding step of forming a first resin molded body formed into a panel shape and having transparency;
By injecting the second resin material while holding the first resin molded body in the second cavity, the first resin molded body is integrated with the back surface of the first resin molded body and has the opaqueness or translucency. A second injection molding step of molding a second resin molding that assists the resin molding,
In the first injection molding step, only the first resin molded body is formed on a bonding region where the first resin molded body and the second resin molded body overlap each other on the surface of the first resin molded body. A method for producing a two-color molded resin window, comprising forming a stepped portion extending along a boundary between a transparent region as a region and the joining region.   The method for manufacturing a two-color molded resin window according to claim 5, wherein, in the second injection molding step, the second resin molding material is held until the second resin molding material is solidified.

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