JP2006150895A - Molding method of multicolored molded product and mold therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a molding method of a multicolored molded product enhanced in its appearance capacity by avoiding the abutment to a mold due to a dividing bar for dividing a cavity, and a mold therefor. <P>SOLUTION: The cavity C formed by the mold clamping of a movable mold 41 and a fixed mold 42 is demarcated into a plurality of, that is, at least two cavities C1 and C2 by the operation of the dividing bar 50 and, at the time of demarcation of the cavities C1 and C2 due to the dividing bar 50, a gap (d) is set between the molding surface of the movable mold 41 and the leading end surface 50a of the dividing bar 50 to avoid the draw damage caused by the abutment of a conventional dividing bar. Then, air is blown against the gap (d) from the air supply system provided to the dividing bar 50 and the leakage of a resin to the outside of the cavity is regulated by air sealing action. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a molding method and a molding die for a multicolor molded article suitable for automobile interior parts such as an automobile door trim, a luggage trim, a trunk trim and the like, and in particular, to improve the appearance performance of a product surface near a parting line. The present invention relates to a method for molding a multicolor molded product and a molding die.

  FIG. 12 is a front view showing an automotive door trim, which is a typical automotive interior part. The automotive door trim 1 includes a door trim upper 2 and a door trim lower 3 in order to enhance the appearance design. It consists of two-color molded products with different colors.

  The configuration of the molding die 4 for molding the door trim 1 will be described with reference to FIG. 13. The molding die 4 is configured such that the movable side die 5 and the fixed side die 6 are mutually clamped and can be opened. A dividing bar 7 is provided in the fixed die 6 at the parting section that divides the door trim upper 2 and the door trim lower 3, and this dividing bar 7 is moved up and down by a predetermined stroke by a drive cylinder 7a. When the door trim upper 2 is molded, the drive cylinder 7a is driven to face the cavity 8 and prevent the molten resin M1 on the door trim upper 2 side from entering the door trim lower molding cavity 8b. At the time of molding, the dividing bar 7 moves backward, and the door trim upper 2 and the door trim lower 3 are integrally molded.

  That is, when the door trim upper 2 is formed, as shown in FIG. 14, the cavity 8 defined by the movable side mold 5 and the fixed side mold 6 is moved into the cavity 8 by the rising of the division bar 7. The surface 7b comes into contact with the mold surface of the movable mold 5, and is divided into a door trim upper molding cavity 8a and a door trim lower molding cavity 8b. Thereafter, molten resin M1 is injected and filled into the door trim upper molding cavity 8a, and the door trim upper 2 is first molded into a required shape.

  When the molding of the door trim upper 2 is completed, the dividing bar 7 is lowered and retracted from the cavity 8 by the contraction operation of the drive cylinder 7a, and the molten resin M2 is injected and filled into the door trim lower molding cavity 8b. The door trim lower 3 is molded integrally with the door trim upper 2 to complete the molding of the door trim 1 shown in FIG. A conventional example of forming a two-color molded product using a dividing bar in the same mold is shown in detail in Patent Document 1.

JP-A-8-267479

  Thus, conventionally, in order to form a two-color molded product (door trim 1) using the same molding die 4, the dividing bar 7 for dividing the cavity 8 is usually used. 7 prevents resin leakage by abutting the tip surface 7b against the mold surface of the movable mold 5 so that the molten resin M1 filled in the cavity 8a on one side does not enter the cavity 8b on the other side. Since the mold surface of the movable mold 5 is abutted against the tip surface 7a of the dividing bar 7 every time it is molded, the drawing pattern provided on the mold surface of the movable mold 5 is damaged. There is a problem that the appearance performance in the vicinity of the parting line is significantly reduced. Furthermore, since the front end surface 7b of the dividing bar 7 is abutted with the mold surface of the movable side mold 5 every time it is molded, it is liable to be damaged and the durability of the molding die 4 and the dividing bar 7 is reduced. It is pointed out at the same time.

  The present invention has been made in view of such circumstances, and a molding method for a multicolor molded product and a molding die for molding a multicolor molded product using a molding die having a dividing bar for dividing a cavity. An object of the present invention is to provide a molding method and a molding die for a multi-color molded product, which can improve the appearance performance of a portion near a parting line and improve the durability of the molding die and the dividing bar. And

  In view of this, the present inventors have intentionally made a gap between the dividing bar and the movable mold in order to avoid abutting the tip surface of the dividing bar that divides the cavity against the mold surface of the movable mold. The air seal prevents the molten resin from entering the cavity on the other side through this gap, and it is found that the appearance of the part near the parting line of the multicolor molded product can be kept good, and the present invention is completed. It came to do.

  That is, according to the present invention, the movable mold and the fixed mold are clamped, and the cavity defined between the two molds is divided into two or more cavities by the dividing bar, In a molding method of a multicolor molded product in which a plurality of resin molded products are integrated by injection-filling different molten resins into the cavities, the mold is clamped and then provided on the fixed mold side When the dividing bar faces the cavity and is divided into two or more cavities, the molten resin is injected and filled into the cavity on one side to mold the resin molded product on the one side. One side that forms a gap between the front end surface and the mold surface of the movable mold and blows air from the front end surface of the split bar, using the air seal action along the parting line of the multicolor molded product Molding process of resin molded products It is characterized by comprising a molding step of a resin molded product on the other side which is molded integrally with a resin molded product on one side by retracting the dividing bar from the cavity and injecting and filling molten resin into the remaining cavity. To do.

  The mold used in this method is a multi-color molded mold formed by integrally molding a plurality of resin molded products in the same mold, and these molds are mutually molded. The movable mold and the fixed mold that can be clamped and opened, the injection machine that injects and fills the molten resin into the cavity, and the fixed mold along the parting line of both resin molded products. It is characterized by comprising a split bar, a drive cylinder for driving the split bar, and an air supply system for supplying air for air-sealing between the tip end surface of the split bar and the movable mold.

  Here, the multicolor molded product is an integrated product of two or more types of resin molded products of different colors molded by the same injection mold. It can be applied not only to two-tone two-color molded products such as door trims, luggage trims, trunk trims, etc., but also to interior parts for automobiles based on multi-color molded products of two or more colors.

  The molds used for molding multicolor molded products are movable molds that can be clamped and opened together, fixed molds, and split bars that divide the cavities formed between the two molds. And a plurality of injection machines for supplying the molten resin into the divided cavities. The split bar performs a predetermined stroke advance / retreat operation by the drive cylinder so as to face the cavity along the parting line of the adjacent molded product. When the drive cylinder is in the most extended state, the front end surface of the split bar and the movable side metal It is adjusted so that a gap of 1 mm or less can be set between the mold. An air supply system, for example, a blower, a supply pipe for supplying air from the blower, and a front end surface of the division bar are formed on the dividing bar to blow air into the gap. And an air outlet for blowing out air.

  As the air outlet, a large number of air holes may be opened at a constant pitch interval along the longitudinal direction of the dividing bar, and elongated long holes may be formed continuously or intermittently. . The air outlet can blow out air, but can control the intrusion of molten resin, for example, a check valve or rubber seal tongue is attached, or a breathable member such as a porous material is used. You can also

  According to the present invention, after the mold is clamped, when the molten resin is injected and filled into the first cavity, the dividing bar enters the cavity to partition the first cavity and the second cavity. At the same time, a gap is set between the front end surface of the dividing bar and the movable mold, and air is blown into the gap, so that the molten resin filled in the first cavity by the air sealing action is the second cavity. Therefore, the first resin molded product can be accurately molded along the parting line.

  Therefore, it is not necessary to abut the tip of the dividing bar against the mold surface of the movable mold, so that the drawing pattern of the movable mold is not damaged and the appearance of the area near the parting line is maintained well. In addition, it is possible to effectively avoid damage caused by the impact of the movable side mold and the dividing bar.

  Next, in another embodiment of the present invention, an air passage space along the parting line is provided on the upper surface of the dividing bar, and the air blown out from the air outlet on the tip surface of the dividing bar is parted. The molten resin that flows in the space along the line and enters the cavity on one side is restricted from entering the cavity on the other side, and air is caught in the cavity on the one side by the side wall of the space. It is characterized by suppressing it.

  According to the above embodiment, since the space for the air passage is provided on the upper surface of the dividing bar that divides the cavity, when the molten resin is injected and filled into the first cavity, If air is forcibly injected into the air, the air flows laterally along the parting line, and an air sealing action along the parting line can be expected, and air is not caught in the first cavity. Therefore, a good parting line can be formed and the air sealability in the space is improved, so that an effective air pressure can be applied. In addition, if the air is blown in the direction opposite to the first cavity from the air outlet of the space, the air can be more effectively prevented from being entrained in the silver streak and flash. It is possible to more reliably prevent molding defects such as.

  As described above, according to the molding method and molding die for a multicolor molded product according to the present invention, the cavity is divided when integrating the resin molded products having different colors using the same molding die. A gap is set between the upper surface of the split bar and the movable mold, and air is forced into the gap from the air outlet of the split bar to achieve an air seal along the parting line. A line can be formed satisfactorily. Therefore, since it is not configured to hit the mold bar against the mold surface as in the past, there is no squeezing damage to the mold, and good appearance design can be expected, and damage to the mold and the split bar can be prevented in advance. The durability of the molding die can be increased.

  Furthermore, in another embodiment of the molding method and molding die for a multicolor molded product according to the present invention, if an air passage space is formed on the upper surface of the dividing bar that divides the cavity, the air that realizes the air seal is It will flow along the parting line, and the air pressure can be effectively applied. In addition, since air can be prevented from being caught in the first cavity, appearance defects such as silver streak and flash can be surely prevented, and a parting line having a good appearance can be formed. It has the effect of being able to.

  Hereinafter, specific examples of a method for molding a multicolor molded product and a molding die according to the present invention will be described in detail with reference to the accompanying drawings.

  FIGS. 1 to 7 show a first embodiment of the present invention. FIG. 1 is a front view showing a car door trim of an upper and lower split type manufactured by using the method for forming a multicolor molded product according to the present invention. FIG. 2 is a cross-sectional view showing the structure of the door trim, FIG. 3 is an overall view showing a molding die used in the molding method of the door trim, and FIG. 4 is an explanatory view showing the structure of a dividing bar in the molding die. 5 is an explanatory view showing a configuration of an air outlet provided in the dividing bar, and FIGS. 6 and 7 are explanatory views showing a door trim upper forming step and a door trim lower forming step in the door trim, respectively.

  In FIG. 1 and FIG. 2, the automobile door trim 10 is composed of an upper and lower divided body of a door trim upper 20 and a door trim lower 30, and a parting line 11 is set between the door trim upper 20 and the door trim lower 30. Has been. Furthermore, the door trim upper 20 and the door trim lower 30 are made of resin molded products having different colors so that the accent effect on the appearance can be emphasized. The product surfaces 20a and 30a of the door trim upper 20 and the door trim lower 30 are The drawn pattern is transferred from a molding die to be described later. Note that various accessory parts, for example, an inside handle escutcheon 21 is attached to the door trim upper 20, and an armrest 22 on which an occupant rests by placing an elbow is formed above the parting line 11. On the other hand, a door pocket opening 31 is formed in the door trim lower 30, and a speaker grill 32 is provided integrally with or separately from the door trim lower 30 on the front side of the door pocket opening 31. The door trim 10 formed by the method of the present invention is characterized in that the appearance performance in the vicinity of the parting line 11 between the door trim upper 20 and the door trim lower 30 is improved.

  Next, the configuration of the molding die 40 for molding the door trim 10 will be described with reference to FIGS. 3 to 5. In FIG. 3, the entire configuration of the molding die 40 will be described. The molding die 40 employs an injection molding method, and the movable side die 41 and the fixed side die 42 are clamped to each other. The fixed side mold 42 is provided with injection machines 43a and 43b for supplying the material of the door trim upper 20 and the door trim lower 30, and the door trim upper 20 and the door trim lower 30. A dividing bar 50 having an air seal function for dividing the cavities is arranged.

  More specifically, the movable side mold 41 is formed with a cavity portion 411 that matches the product shape, and the movable side mold 41 is driven by a lifting / lowering cylinder 412 connected to the upper surface of the movable side mold 41. Performs a predetermined stroke up-and-down motion, and the fixed mold 42 is clamped and opened. In addition, guide bushes 413 serving as a guide mechanism are provided at the four corners of the movable mold 41. On the other hand, the fixed side mold 42 is provided with a core part 421 corresponding to the cavity part 411 of the movable side mold 41. Further, manifolds 422a and 422b and gates 423a and 423b are provided to supply molten resin to the mold surface of the core portion 421, and the injection machine passes through the resin passages of the manifolds 422a and 422b and gates 423a and 423b. The molten resins M1 and M2 supplied from 43a and 43b are supplied into the door trim upper molding cavity C1 and the door trim lower molding cavity C2 formed on the upper surface of the core portion 421. In addition, guide posts 424 serving as a guide mechanism protrude from the four corners of the fixed-side mold 42. The guide posts 424 are inserted into the guide bush 413 when the molding dies 41 and 42 are clamped. By being guided, the pressing posture of the movable mold 41 can be properly maintained. That is, the molten resin M1 supplied from the one side injection machine 43a is injected and filled into the door trim upper molding cavity C1 through the manifold 422a and the gate 423a. On the other hand, the molten resin M2 supplied from the other-side injection machine 43b is injected and filled into the door trim lower molding cavity C2 through the manifold 422b and the gate 423b.

  Incidentally, the molding die 40 according to the present invention is characterized by the structure of the dividing bar 50 that divides the cavity C into C1 and C2. That is, as shown in FIG. 4, the dividing bar 50 is formed of a long block body along the parting line 11, and the dividing bar 50 is moved up and down by the driving cylinder 51. When 51 extends, it rises to a point where a gap of about 1 mm is secured between the tip surface 50a of the dividing bar 50 and the mold surface of the movable mold 41 lowered to the bottom dead center. On the other hand, when the drive cylinder 51 is contracted, the vertical stroke amount is controlled so that the tip surface 50a of the dividing bar 50 is lowered to a lower position that is substantially flush with the mold surface of the fixed mold 42.

  Further, in order to provide an air seal function to the dividing bar 50, an air blowing port 52 is provided at the front end surface 50 a of the dividing bar 50, and an air supply pipe 53 for supplying air to the air blowing port 52. An air supply system such as a blower 54 is provided. Further, as the shape of the air outlet 52, for example, as shown in FIG. 5A, the air outlet 52 may be continuously opened in an elongated shape along the longitudinal direction of the dividing bar 50. As shown in FIG. 5B, the elongated air outlet 52 may be opened intermittently along the longitudinal direction. Alternatively, as shown in FIG. 5C, a plurality of round hole-shaped air outlets 52 may be opened along the longitudinal direction at predetermined pitch intervals. Further, the air blowing port 52 is capable of blowing air, but adopts a configuration that restricts the intrusion of the molten resin. That is, a check valve is provided at the air outlet 52 or a rubber seal tongue is attached so as to close the air outlet 52, and the air outlet 52 is opened by air pressure only when air is blown out. You can also

  And the process of shape | molding the door trim 10 which is a multicolor molded product shown in FIG. 1, FIG. 2 using this shaping die 40 is demonstrated. First, the movable die 41 is lowered by a predetermined stroke by driving the elevating cylinder 412, and the molding dies 41 and 42 are clamped. At that time, as shown in FIG. 6, the molten resin M1 is injected and filled into the cavity C1 on one side through the manifold 422a and the gate 423a from the injection machine 43a on one side. As a result of this extension operation, the distance rises to a gap d of about 1 mm with respect to the mold surface of the movable mold 41, and the split bar 50 allows the molten resin M1 to flow out into the cavity C2 on the other side. Almost can be prevented.

Further, air is blown into the gap d between the front end surface 50 a of the dividing bar 50 and the movable side mold 41. In this embodiment, the factory air is blown in the direction of the arrow with an air pressure of 10 kgf / cm ² , and the air sealing action at this time ensures that the molten resin M1 filled in the cavity C1 flows into the cavity C2 on the other side. Can be prevented. Note that N ₂ gas or CO ₂ gas may be used instead of air.

  And since the structure which avoids the contact between the front end surface 50a of the division | segmentation bar 50 and the mold surface of the movable side metal mold | die 41 like this Example was employ | adopted, it carved on the mold surface of the movable side metal mold | die 41. The squeezing damage that occurs during the conventional abutting structure against the squeezed pattern can be avoided, and the impact applied when abutting against the movable mold 41 and the dividing bar 50 can be eliminated, and the durability of the molding die 40 can be improved.

  Next, when the molding of the door trim upper 20 is completed, the dividing bar 50 is retracted from the cavity C by the drive of the drive cylinder 51, and as shown in FIG. 7, the other side injection machine 43b, manifold 422b, gate The other side molten resin M2 is injected and filled into the door trim lower molding cavity C2 through 423b, the door trim lower 30 is molded into a required shape, and is integrated with the door trim upper 20, so that the door trim 10 shown in FIGS. Is formed. In the molded door trim 10, particularly, in the vicinity of the parting line 11, the drawing pattern provided on the mold surface of the movable mold 41 is accurately transferred to the product surfaces 20 a and 30 a of the door trim upper 20 and the door trim lower 30. At this time, since there is no squeezing damage on the mold surface of the molding die 40, good appearance performance can be obtained. In the first embodiment, the door trim 10 is manufactured in the form of a two-color molded product. However, for example, a three-color molded product divided into three parts in the vertical direction, such as a trim upper, a trim center, and a trim lower, may be used. .

  FIGS. 8 to 11 show a second embodiment of the present invention. FIG. 8 is an explanatory view showing the structure of the dividing bar arranged in the molding die according to the present invention. FIGS. 9 and 10 are the molding die. FIG. 11 is an explanatory view showing a modified example in which the air blowing direction from the dividing bar is changed. The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In this second embodiment, by avoiding contact between the movable side mold 41 and the tip end surface 50a of the dividing bar 50 in the molding die 40, it is possible to prevent the movable side mold 41 from being squeezed and to have a good appearance. The point of imparting performance is the same as that of the first embodiment, but it is particularly characterized in that the air flow at the time of air sealing is effectively controlled. As a configuration of the dividing bar 50 for that purpose, as shown in FIG. 8, an air passage space 55 extending along the parting line 11 is provided in a groove shape on the front end surface 50 a of the dividing bar 50. In the second embodiment, the side wall 55a on one side of the air passage space 55 effectively prevents the air in the space 55 from entering the cavity C1.

  That is, in the molding process of the door trim upper 20, as shown in FIG. 9, the dividing bar 50 is positioned at the uppermost position by the extension operation of the drive cylinder 51. At this time, the dividing bar 50 and the movable side mold 41 are located. The side wall 55a of the air passage space 55 is in contact with the mold surface of the movable mold 41, or is opposed to the mold surface of the movable bar 41 via a minute clearance. If air is blown from the air outlet 52, the air flows along the air passage space 55, that is, along the parting line 11, in a direction perpendicular to the paper surface, and the side wall 55 a and the movable side mold 41. Air does not leak out from the part indicated by the symbol A between and the point indicated by A becomes the parting line 11, and a sharp parting line can be accurately formed. That. Thereafter, as shown in FIG. 10, due to the contraction operation of the drive cylinder 51, the dividing bar 50 is retracted from the cavity C2, and the molten resin M2 is injected into the cavity C2 through the other side injection machine 43b, manifold 422b, and gate 423b. If filled, the door trim lower 30 can be formed into a required shape, and the door trim upper 20 and the door trim lower 30 can be integrated.

  As described above, in the second embodiment, by providing the air passage space 55 on the front end surface 50a of the dividing bar 50, by controlling the flow of air along the parting line 11, molding defects due to the entrainment of air are prevented. It can be surely prevented. Therefore, it is possible to form a sharp parting line 11 without meandering the parting line 11, and an effect of avoiding the squeezing damage of the mold, which is the operational effect of the first embodiment, to produce a good drawing pattern. In addition, by preventing air entrainment, there is an accompanying advantage that molding defects such as silver streak and flash can be avoided and the sharp parting line 11 can be formed with high accuracy.

  Further, as shown in FIG. 11, when air is blown from the air outlet 52 into the air passage space 55 of the dividing bar 50, if the air blowing direction is controlled in an oblique direction, the air is entrained in the cavity C1. Can be prevented more effectively.

  In the first embodiment and the second embodiment described above, the present invention is applied to the door trim 10 that is composed of the upper and lower divided bodies of the door trim upper 20 and the door trim lower 30. The present invention can be applied to all multicolor molded products that produce Further, the shape of the dividing bar 50, the pattern and configuration of the air outlet 52, and the configuration of the air supply system and the like can be appropriately changed, and a molded product with a skin can be applied as the door trim upper 20. it can.

It is a front view which shows the door trim for motor vehicles of the upper and lower divided type produced by applying the molding method of the multicolor molded product which concerns on this invention. It is the II-II sectional view taken on the line in FIG. It is explanatory drawing which shows the whole structure of the shaping die used for the shaping | molding method of the multicolor molded product which concerns on this invention. It is explanatory drawing which shows the structure of 1st Example of the division | segmentation bar employ | adopted as the shaping die shown in FIG. It is explanatory drawing which shows the various patterns of the air blowing opening established in the front end surface of the division bar shown in FIG. It is explanatory drawing which shows the formation process of the door trim upper using the shaping die shown in FIG. It is explanatory drawing which shows the formation process of the door trim lower using the shaping die shown in FIG. It is explanatory drawing which shows the structure of 2nd Example of the division | segmentation bar in the molding die of the multicolor molded product which concerns on this invention. It is explanatory drawing which shows the formation process of the door trim upper which uses the division | segmentation bar shown in FIG. It is explanatory drawing which shows the formation process of the door trim lower which uses the division | segmentation bar shown in FIG. It is explanatory drawing which shows the modification of the division | segmentation bar shown in FIG. It is a front view which shows the conventional upper and lower split type automobile door trim. It is explanatory drawing which shows the outline | summary of the shaping | molding die which shape | molds the conventional upper and lower split type automobile door trim. It is explanatory drawing which shows the formation process of the door trim upper and door trim lower in the conventional upper and lower split type automobile door trim.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Automotive door trim 11 Parting line 20 Door trim upper 30 Door trim lower 40 Molding die 41 Movable side die 411 Cavity part 412 Lifting cylinder 42 Fixed side die 421 Core part 422a, 422b Manifold 423a, 423b Gate 43a, 43b Injection machine 50 Dividing bar 50a End face 51 Drive cylinder 52 Air outlet 53 Air supply pipe 54 Blower 55 Air passage space 55a Side wall C1 Door trim upper molding cavity C2 Door trim lower molding cavity M1, M2 Molten resin

Claims (4)

The movable mold (41) and the fixed mold (42) are clamped, and the cavity (C) defined between the two molds (41, 42) is divided into two or more by the dividing bar (50). By dividing into a plurality of cavities (C1, C2) and filling each of the divided cavities (C1, C2) with different molten resins (M1, M2), a plurality of resin molded products (20, 30) are obtained. In the molding method of the multi-color molded product (10) formed integrally,
After the molds (41, 42) are clamped, the dividing bar (50) provided on the fixed mold (42) side is brought into the cavity (C), so that two or more cavities (two or more cavities ( C1 and C2) and when the molten resin (M1) is injected and filled into the cavity (C1) on one side to mold the resin molded product (20) on the one side, the tip of the dividing bar (50) By setting a gap (d) between the surface (50a) and the mold surface of the movable mold (41) and blowing out air from the tip surface (50a) of the dividing bar (50), 10) a molding step of the resin molded article (20) on one side which is molded by acting an air seal along the parting line (11);
The other part formed integrally with the resin molded product (20) on one side by retreating the dividing bar (50) from the cavity (C) and injecting and filling the molten resin (M2) into the remaining cavity (C2). Molding process of the resin molded product (30) on the side;
A method for forming a multicolor molded product, comprising:   An air passage space (55) along the parting line (11) is provided on the upper surface of the dividing bar (50), and is blown out from the air outlet (52) of the front end surface (50a) of the dividing bar (50). The air flows along the parting line (11) in the space (55), and the molten resin (M1) filled in the cavity (C1) on one side enters the cavity (C2) on the other side. The molding of the multicolor molded product according to claim 1, wherein air is prevented from being caught in the cavity (C1) on one side by the side wall (55a) of the space (55). Method.   A molding die (40) of a multicolor molding (10) formed by integrally molding a plurality of resin moldings (20, 30) in the same die, and the molding die (40) The movable side mold (41) and the fixed side mold (42) that can be clamped and opened to each other, the injection machines (43a, 43b) for injecting and filling the molten resin into the cavities (C1, C2), A split bar (50) disposed in the fixed mold (42) along the parting line (11) of the resin molded product (20, 30), and a drive cylinder (51) for driving the split bar (50). And an air supply system (52, 53, 54) for supplying air for air-sealing between the front end surface (50a) of the dividing bar (50) and the movable die (41). Mold for multicolor molded products. The molding of the multicolor molded product according to claim 3, wherein an air passage space (55) for guiding air along a lateral direction is recessed on the upper surface of the dividing bar (50). Mold.

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