JP2007001197A - Molding method of synthetic resin injection-molded product and injection mold assembly - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To mold a synthetic resin molded product having planned appearance by preventing the occurrence of a gap between a primary injection molding part released from the prescription due to a slide core and a mold part when a cavity part for second injection molding is formed by allowing the slide core to retreat. <P>SOLUTION: A suction means 9 is provided to the region of the mold part 6 opposed to the slide core 7 provided in the vicinity of the end part of a cavity part 8 for primary injection molding. A first resin 10 is injected in the cavity part 8 for the primary injection molding for the purpose of primary injection molding to form a primary injection molding part 1. Next, the end part of the outer surface on the side opposite to the overlap surface 12 of the slide core 7 is allowed to retreat not only to form the cavity part 13 for secondary injection molding but also to suck the end part of the outer surface on the side opposite to the overlap surface 12 of the primary injection molding part 1 by the suction means 9. Subsequently, a second resin 14 is injected in the cavity 13 for secondary injection molding for the purpose of secondary injection molding not only to form a secondary injection molding part 2 but also to allow a part of the secondary injection molding part 2 to integrally overlap with the overlap surface 12 of the primary injection molding part 1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for molding a synthetic resin molded product in which a secondary injection molded portion is integrated with a primary injection molded portion, and an injection mold apparatus.

  Conventionally, a part of the overlapping part 3b of the secondary injection molding part 2 is integrated with the end of the outer surface of the primary injection molding part 1 and the non-overlapping part 3a of the secondary injection molding part 2 is the primary injection molding part 1. Patent Document 1 discloses a molding method and an injection mold apparatus 5 for molding a synthetic resin injection molded product 4 projecting from the end of the mold.

  The order of manufacturing the synthetic resin injection-molded product 4 using the conventional injection mold apparatus 5 shown in Patent Document 1 is schematically shown in FIGS.

  That is, as shown in FIG. 7, the fixed mold part 6a and the movable mold part 6b are closed and the slide core 7 is advanced to form the primary injection molding cavity part 8, and then as shown in FIG. The first resin 10 is injected into the primary injection molding cavity 8 by primary injection molding, and then the slide core 7 is moved backward as shown in FIG. 9 to form the secondary injection molding cavity 13. Next, as shown in FIG. 10, the second resin 14 is injected into the secondary injection molding cavity 13 by secondary injection molding to form the secondary injection molding portion 2 and one of the secondary injection molding portions 2. The part is overlapped and integrated with the end of the outer surface of the primary injection molded part 1.

However, in the above-described conventional example, after the first resin 10 is molded in the primary injection molding cavity 8 by primary injection molding, the slide core 7 is retracted to form the secondary injection molding cavity 13. However, during this time, the primary injection molding portion 1 formed in the primary injection molding cavity portion 8 begins to harden and tends to shrink. In this case, since the restriction | limiting by the slide core 7 is cancelled | released in the site | part facing the slide core 7 of the edge part of the primary injection molding part 1, the edge part of the primary injection molding part 1 and the slide core 7 of the fixed mold part 6a A gap (indicated by “A” in FIG. 9) occurs due to the shrinkage of the primary injection molded part 1 between the opposed parts. For this reason, when the second resin 14 is injection-molded by secondary injection molding as shown in FIG. 10 in the cavity for secondary injection molding formed by retreating the slide core 7, the second resin 14 is the primary resin. The resin enters the gap A between the end of the injection molded part 1 and the fixed mold part 6 (B in FIG. 10 indicates the second resin 14 that has entered the gap A), and the synthetic resin molded product 4 is as designed. There was a problem that the product could not be molded into the appearance, and the appearance deteriorated and the commercial value was lowered.
JP-A-8-118421

  The present invention has been invented in view of the above-described conventional problems, and in forming a synthetic resin molded product in which a secondary injection molding part is integrated integrally with a primary injection molding part, the slide core is moved backward to form a second product. When forming the cavity for the next injection molding, no gap is generated between the end of the primary injection molded part, which is no longer regulated by the slide core, and the mold part. It is an object of the present invention to provide a method for molding a synthetic resin injection molded product and an injection mold apparatus capable of molding the synthetic resin molded product.

  In order to solve the above-mentioned problems, the method for molding a synthetic resin injection molded product according to the present invention is such that a portion of the secondary injection molded portion 2 overlaps at least the end of one of the outer surfaces of the primary injection molded portion 1. A molding method for molding the synthetic resin injection molded product 4 in which the non-overlapping part 3a of the secondary injection molding part 2 protrudes from the end part of the primary injection molding part 1 with the injection mold device 5 while being integrated. Then, the injection mold apparatus 5 composed of a plurality of mold parts 6 is closed and the slide core 7 is advanced to form the primary injection molding cavity part 8, and the primary injection molding cavity part 8 is the first. The primary injection molding portion 1 is molded by injecting the resin 10 by primary injection molding, and then the slide core 7 is retracted to expose at least the end portion of the outer surface of the primary injection molding portion 1 as the overlapping surface 12. Overlapping surface 12 and gold of primary injection molding part 1 The secondary injection molding cavity 13 surrounded by the part 6 and the slide core 7 is formed, and the gold facing the slide core 7 near the end of the primary injection molding cavity 8 when the slide core 7 is retracted. The outer surface of the primary injection molding part 1 opposite to the overlapping surface 12 is sucked by the suction means 9 from the inner surface side of the mold part 6, and then the second resin 14 is secondarily injected into the secondary injection molding cavity part 13. A secondary injection molding part 2 is formed by injection by molding, and a part of the secondary injection molding part 2 is overlapped and integrated with the overlapping surface 12 of the primary injection molding part 1.

  By adopting such a method, after the first resin 10 is injected into the primary injection molding cavity 8 by primary injection molding, the slide core 7 is moved backward to at least the end of the outer surface of the primary injection molding portion 1. When the secondary injection molding cavity 13 surrounded by the overlapping surface 12 of the primary injection molding part 1, the mold part 6 and the slide core 7 is formed as the overlapping surface 12 by exposing the surface of the primary injection molding part 1. The restriction by the slide core 7 is released on the end side of the primary injection molded part 1 injection-molded in the part 8, and the end of the primary injection molded part 1 and the mold part 6 are contracted by the contraction of the primary injection molded part 1. There is an attempt to create a gap therebetween, but the overlapping surface of the primary injection molding part 1 from the inner surface side of the mold part 6 facing the slide core 7 near the end of the primary injection molding cavity part 8 when the slide core 7 is retracted. 12 and anti The outer surface on the side is sucked by the suction means 9 to restrict the shrinkage of the end portion of the primary injection molded portion 1 and prevent a gap from being formed between the end portion of the primary injection molded portion 1 and the mold portion 6. In the subsequent secondary injection molding, the second resin 14 does not enter between the primary injection molded part 1 and the mold part 6, and thereby the synthetic resin molded product 4 having an appearance as designed. Can be molded. Moreover, since the restriction | limiting of the shrinkage | contraction of the edge part of the primary injection molding part 1 is performed by the suction means 9, even if the outer surface edge part of the primary injection molding part 1 is a flat surface, the shrinkage restriction | limiting of the primary injection molding part 1 is ensured. Therefore, the synthetic resin molded product 4 to be molded does not need a special shrinkage regulation shape such as a protrusion for shrinkage regulation.

  Also, a plurality of primary injection molding cavities 8 for closing the injection mold device 5 comprising a plurality of mold parts 6 and advancing the slide core 7 to form a plurality of primary injection molding parts 1 are provided. The ends of adjacent primary injection molding cavities 8 are formed so as to be spaced apart from each other, and the first resin 10 is injected into the plurality of primary injection molding cavities 8 by primary injection molding, and the plurality of primary injection molding cavities 8 are injected. Next, the primary injection molding part 1 is molded, and then the slide core 7 is retracted, and the adjacent primary injection molding surrounded by the overlapping surface 12 of the adjacent primary injection molding part 1, the mold part 6 and the slide core 7. A mold for forming a secondary injection molding cavity 13 straddling between the ends of the part 1 and facing the slide core 7 near the end of the adjacent primary injection molding cavity 8 when the slide core 7 is retracted From the inside of part 6 The outer surface of the primary injection molding part 1 opposite to the overlapping surface 12 is sucked by the suction means 9, and then the second resin 14 is injected into the secondary injection molding cavity part 13 by secondary injection molding. It is preferable that the secondary injection molding part 2 is formed and a part of the secondary injection molding part 2 is overlapped and integrated with each overlapping surface 12 of the adjacent secondary injection molding part 2.

  By adopting such a method, the synthetic resin injection molded product 4 in which the primary injection molded parts 1 whose ends are adjacent to each other at a distance can be integrated by the secondary injection molded part 2 can be molded by injection molding. In addition, in this case, the second resin 14 does not enter between the primary injection molded part 1 and the mold part 6 during the secondary injection molding, and the synthetic resin molded product 4 has an appearance as designed. Can be molded.

  Further, the injection mold apparatus 5 of the present invention comprises a mold apparatus 5 comprising a plurality of mold parts 6, a slide core 7 provided in the mold part 6 that can be moved forward and backward, and a first resin 10. A first gate 15 for injecting and a second gate 16 for injecting the second resin 14, the mold parts 6 are closed, and the slide core 7 is advanced. , First injection of the first resin 10 from the first gate 15 to form a primary injection molding cavity portion 8 for molding the primary injection molding portion 1, closing the plurality of mold portions 6, and By retreating the slide core 7, the overlapping surface 12 in which at least the end of the outer surface of the primary injection molded part 1 formed in the primary injection molding cavity part 8 is exposed, the mold part 6, and the retracted slide core. The second resin 14 is secondarily injected into the space surrounded by 7 The secondary injection molding part 2 is formed as a secondary injection molding cavity part 13 for molding, and is slid on the mold part 6 facing the slide core 7 near the end of the primary injection molding cavity part 8. A suction means 9 is provided for sucking the vicinity of one end of the outer surface of the primary injection molding part 1 when the core 6 is retracted, and the projection surface of the cavity part 13 for secondary injection molding projected from the moving direction of the slide core 7 is provided. The overlapping surface 12 of the primary injection molding part 1 is located in part.

  In this manner, the vicinity of the end portion of one outer surface of the primary injection molding portion 1 is sucked into the portion of the mold portion 6 facing the slide core 7 near the end portion of the primary injection molding cavity portion 8 when the slide core 6 is retracted. By adopting a simple configuration in which the suction means 9 is provided, it is possible to prevent a gap from being formed between the end portion of the primary injection molding portion 1 and the mold portion 6, and at the time of subsequent secondary injection molding. In addition, it is possible to provide an injection mold apparatus 5 in which the second resin 14 does not enter between the primary injection molding section 1 and the mold section 6.

  Further, by closing the plurality of mold parts 6 and moving the slide core 7 forward, a plurality of primary injection molding cavities 8 are separated from the ends of adjacent primary injection molding cavities 8. At least the end of the outer surface of the primary injection molded part 1 formed in the cavity for primary injection molding by closing the plurality of mold parts 6 and retracting the slide core 7. A space surrounded by the exposed surface 12, the mold part 6, and the retracted slide core 7 is formed as a secondary injection molding cavity part 13, and each of the adjacent primary injection molding cavity parts 8 is formed. A suction means 9 for sucking the vicinity of the end of one outer surface of the primary injection molding part 1 when the slide core 7 is retracted is provided at the site of the mold part 6 facing the slide core 7 near the end, respectively. Co It is preferred 7 overlapping surface 12 of the adjacent primary injection molding unit 1 in a part of the projection surface of the secondary injection molding cavity 13 projected from the moving direction of in which are located, respectively.

  By adopting such a configuration, the synthetic resin injection molded product 4 in which the primary injection molded parts 1 whose end parts are adjacent to each other at a distance can be connected and integrated by the secondary injection molded part 2 can be injection molded. An injection mold that can mold the synthetic resin molded product 4 that has the appearance as designed without the second resin 14 entering between the primary injection molded part 1 and the mold part 6 during the next injection molding. A device 5 can be provided.

  In the present invention, when the slide core is retracted, the outer surface of the primary injection molding portion opposite to the overlapping surface is sucked by the suction means from the inner surface side of the mold portion facing the slide core near the end of the primary injection molding cavity. With this simple configuration, the secondary resin does not enter between the primary injection molding part and the mold part during secondary injection molding, and it is easy to mold a synthetic resin molded product that has the appearance as designed. it can.

  Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings.

  As shown in FIG. 5, the synthetic resin injection molded product 4 molded by the synthetic resin injection molded product molding method and the injection mold apparatus of the present invention has at least one of the outer surfaces of the primary injection molded portion 1. A part of the secondary injection molding part 2 (overlapping part 3b) is overlapped and integrated at the end, and the non-overlapping part 3a of the secondary injection molding part 2 projects beyond the end of the primary injection molding part 1. is there.

  In the embodiment shown in FIG. 5, an example in which a plurality of primary injection molded parts 1 are integrally connected by a secondary injection molded part 2 is shown. Further, in this example, for example, PP (polypropylene), PE (polyethylene), HDPE (Primary injection molded part 1 is formed with a first resin 10 made of a hard resin such as (high density polyethylene), PC (polycarbonate), PVC (vinyl chloride resin), ABS resin, etc., for example, TPE (elastomer), LDPE Non-overlapping part of the secondary injection molded part 2 made of soft resin by forming the secondary injection molded part 2 with the second resin 14 made of soft resin such as (low density polyethylene) or EVA (ethylene vinyl acetate copolymer) An example in which 3a constitutes a hinge portion is shown.

  FIG. 1 shows an example of an injection mold apparatus 5 of the present invention for molding the synthetic resin molded product 4 shown in FIG.

  The mold apparatus 5 for injection molding injects the slide core 7 which can be moved forward and backward provided in the mold part 6, the first gate 15 for injecting the first resin 10, and the second resin 14. And a second gate 16 for the purpose.

  The mold part 6 includes a fixed mold part 6a and a movable mold part 6b. A recess 18 is provided on a surface of the movable mold part 6b facing the fixed mold part 6a. The slide core 7 is housed in such a manner that it can be moved forward and backward (in FIG. 1, arrow A indicates the forward direction and arrow B indicates the backward direction).

  In the present invention, the movable mold part 6b is movable in the lateral direction (horizontal direction) or the vertical direction (vertical direction) with respect to the fixed mold part 6a, and by moving the movable mold part 6b. The mold is closed and the mold is opened. Moreover, the slide core 7 is movable in the same direction as the movable direction of the movable mold part 6b with respect to the movable mold part 6b.

  The fixed mold part 6a and the movable mold part 6b are closed and the slide core 7 is advanced, and the fixed mold part 6a, the movable mold part 6b, and the advanced slide core 7 are surrounded. This space is formed as a primary injection molding cavity 8. A plurality of the primary injection molding cavities 8 are formed, and the ends of the adjacent primary injection molding cavities 8 are separated by a distance. The slide core 7 extends between the end portions of the adjacent primary injection molding cavities 8, and the center portion of the front surface of the slide core 7 is adjacent to each of the primary injection molding cavities adjacent to the fixed mold portion 6 a. The both sides of the front surface of the slide core 7 are opposed to the portion 6a1 between the eight end portions, and constitute an inner surface on one side of the end portion of the primary injection molding cavity portion 8 adjacent thereto.

  The plurality of primary molding cavities 8 are formed by providing a plurality of cavity forming recesses 17 on one or both of the opposing surfaces of the fixed mold part 6a to the movable mold part 6b. In the embodiment of the accompanying drawings, an example is shown in which a plurality of cavity forming recesses 17 are formed in the fixed mold part 6a.

  The end of the outer surface of the primary injection injection molding part 1 that is injection-molded in the primary injection molding cavity part 8 is located at a portion corresponding to the end part of the primary injection molding cavity part 8 facing the slide core 7 of the fixed mold part 6a. A suction means 9 that can suck the part is provided.

  The suction means 9 is composed of a ventilation portion 9a through which gas can pass but resin cannot pass through and a vacuum suction device 9b connected to the ventilation portion 9a. For example, as shown in FIG. A hole 9c having one end opened on the inner surface of the portion corresponding to the end of the primary injection mold cavity 8 facing the slide core 7 and the other end communicating with the vacuum suction device 9b is provided in the hole 9c. A pin 9d is fitted, and a very small gap is formed between the inner peripheral surface of the hole 9a and the outer peripheral surface of the pin 9d, but no gas can pass therethrough, and this gap is used as the ventilation portion 9a.

  Further, only the slide core 7 is retracted in a state where the fixed mold part 6a and the movable mold part 6b are closed, so that the primary injection molded parts 1 molded in the adjacent primary injection molding cavity parts 8 respectively. One of the outer surfaces of each of the outer surfaces is exposed, and the overlapping surface 12 and the mold are exposed surfaces of the primary injection molding portion 1 respectively molded in the adjacent primary injection molding cavity portion 8. A space to be a secondary injection molding cavity 13 surrounded by the part 6 and the slide core 7 is formed.

  The first gate 15 and the second gate 16 are each provided in the fixed mold portion 6a, and a plurality of the first gates 15 are provided, and the first gate is provided in each of the plurality of primary injection molding cavities 8. 15 is open. The second gate 16 opens to a portion 6a1 between the end portions of the adjacent primary injection molding cavities 8 of the fixed mold portion 6a to close the mold portion 6 and advance the slide core 7. In this state, the front end surface of the slide core 7 comes into contact with the second gate 16 and closes, and the mold portion 6 is closed and the slide core 7 is moved backward to make the cavity portion for secondary injection molding. The second gate 16 is configured to open to the secondary injection molding cavity 13 in a state in which 13 is formed.

  The synthetic resin injection molded product 4 is molded using the injection molding die device 5 as described above as follows.

  First, as shown in FIG. 1, a plurality of mold parts 6 are closed and the slide core 7 is advanced to form a primary injection molding cavity 8, and the primary injection molding cavity 8 is shown in FIG. 2. Thus, the primary injection process which inject | pours the 1st resin 10 from the 1st gate 15 by primary injection molding, and shape | molds the primary injection molding part 1 is implemented.

  By this primary injection molding, the primary injection molding part 1 is molded in the cavity part 8 for primary injection molding.

  Next, as shown in FIG. 3, the slide core 7 is moved backward with the plurality of mold parts 6 closed, and the overlapping surface 12 of the adjacent primary injection molding part 1, the mold part 6, and the slide core are moved. The secondary injection molding cavity 13 is formed between the ends of the adjacent primary injection molding parts 1 surrounded by 7.

  In this case, the restriction by the slide core 7 is released on the end side of the primary injection molded part 1 injection-molded in the primary injection molding cavity 8, and therefore the primary injection molded part 1 is contracted by the primary injection molded part 1. In the present invention, when the slide core 7 is retracted, the slide core near the end of the adjacent primary injection molding cavity 8 is formed. 7 from the inner surface side of the mold portion 6 (fixed mold portion 6a) opposite to the outer surface of the primary injection molding portion 1 opposite to the overlapping surface 12 by the suction means 9 (arrow C in FIG. This shows the gas suction direction by the suction device 9b), and even if the slide core 7 is retracted and the restriction by the slide core 7 is released, the contraction of the end of the primary injection molding part 1 is restricted. It will be. Therefore, when the slide core 7 is retracted after the primary injection molding to form the secondary injection molding cavity 13, it is possible to prevent a gap from being generated between the end of the primary injection molding part 1 and the mold part 6. Is done.

  Next, as shown in FIG. 4, the second resin 14 is injected from the second gate 16 into the secondary injection molding cavity 13 formed as described above by secondary injection molding, and is subjected to secondary injection molding. The overlapping part 3b at both ends of the secondary injection molding part 2 is overlapped and integrated with the overlapping surface 12 of the outer surface end part of one side of the primary injection molding part 1 adjacent to the part 2 while being molded.

  As described above, when the slide core 7 is moved backward to form the secondary injection molding cavity portion 13, the restriction of the overlapping surface 12 of the primary injection molding portion 1 by the slide core 7 is released. In the present invention, when the slide core 7 is retracted, the suction means 9 sucks the outer surface opposite to the overlapping surface 12 of the primary injection molding part 1 toward the mold part 6 side. Is prevented from forming a gap between the end portion of the primary injection molding portion 1 and the mold portion 6, and the secondary injection molding is performed between the primary injection molding portion 1 and the mold portion 6. The second resin 14 does not enter.

  For this reason, according to the present invention, the second resin 14 for molding the secondary injection molded part 2 does not ooze out from the portion other than the overlapping surface with respect to the primary injection molded part 1, and as designed. The synthetic resin molded product 4 having an excellent appearance and excellent appearance can be molded.

  After the secondary injection molding is performed as described above, a mold release step is performed in which the mold apparatus 5 for injection molding is opened and the synthetic resin injection molded product 4 is taken out.

  From these series of mold closings, a series of processes such as primary injection molding, secondary injection molding, and mold release process are executed under the control of a control unit (not shown).

  The synthetic resin molded product 4 as shown in FIG. 5 molded as described above is used by the suction means 9 to restrict the end of the primary injection molded part 1 from contracting when the slide core 7 is retracted. Since the shrinkage of the end of the primary injection molding part 1 is regulated by suction, the end of the other outer surface facing the overlapping surface 12 of the primary injection molding part 1 is molded as a flat surface as shown in FIG. Even when the slide core 7 is retracted, the contraction of the end portion of the primary injection molding portion 1 can be reliably controlled. As a result, the outer end portion of the primary injection molding portion 1 can be regulated for contraction. There is no need to provide a rib or the like, and the end portion of the primary injection molded part 1 can be formed into a thin plate shape without a rib or the like.

  As shown in FIG. 6, when both ends of the slide core 7 are opposed to the ends of adjacent primary injection molding cavities 8, the end of one primary injection molding cavity 8 of the fixed mold 6a. Even if the width of the range M1 opposed to the slide core 7 is narrow and the slide core 7 is retracted, the end of the primary injection molded part 1 contracts to create a gap between the primary injection molded part 1 and the mold part 6. If there is no such a fear, the suction means 9 is provided only at the portion where the width of the range M2 facing the slide core 7 at the end of the other primary injection molding cavity 8 of the fixed mold 6a is wide. You may do it.

  As shown in FIGS. 5 and 6, the overlapping portions 3b on both sides of the secondary injection molding part 2 are laminated and integrated at the ends of the primary injection molding parts 1 adjacent to each other at a distance. If the first resin 10 for forming the part 1 is a hard resin and the second resin 23 for forming the secondary injection molded part 2 is a soft resin, the intermediate part of the secondary injection molded part 2 The non-overlapping part 3a (that is, the non-overlapping part 3a at the intermediate part of the secondary injection molding part 2 is a part protruding from the end parts of both primary injection molding parts 1) is a hinge part, and is a hard first resin The primary injection molded parts 1 made of 10 can be integrally connected to each other by a hinge part made of the soft second resin 14 so as to be bent.

It is sectional drawing of the mold closing state of the injection mold apparatus of this invention. It is sectional drawing of the injection mold apparatus of the state which filled the 1st resin by primary injection molding to the primary injection molding cavity part same as the above, and formed the primary injection molding part. It is sectional drawing of the injection mold apparatus of the stage which formed the cavity part for secondary injection molding same as the above. It is sectional drawing of the injection mold apparatus of the stage which filled the 2nd resin by secondary injection molding in the secondary injection molding cavity part same as the above, and formed the secondary injection molding part. An example of the synthetic resin injection-molded product molded by the same as above is shown, (a) is a perspective view, and (b) is a cross-sectional view. (A) is sectional drawing of the mold closing state of the injection molding die apparatus of other embodiment of this invention, (b) is sectional drawing of the synthetic resin injection molding goods manufactured same as the above. It is sectional drawing of the mold closing state of the injection molding die apparatus of a prior art example. It is sectional drawing of the injection mold apparatus of the state which filled the 1st resin by primary injection molding to the primary injection molding cavity part same as the above, and formed the primary injection molding part. It is sectional drawing of the injection mold apparatus of the stage which formed the cavity part for secondary injection molding same as the above. It is sectional drawing of the injection mold apparatus of the stage which filled the 2nd resin by secondary injection molding in the secondary injection molding cavity part same as the above, and formed the secondary injection molding part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Primary injection molding part 2 Secondary injection molding part 3a Non-overlapping part 4 Synthetic resin injection molded product 5 Injection mold apparatus 6 Mold part 7 Slide core 8 Cavity part for primary injection molding 9 Suction means 10 First resin 12 Overlapping surface 13 Secondary injection molding cavity 14 Second resin 15 First gate 16 Second gate

Claims (4)

  A part of the secondary injection molding part is overlapped and integrated with at least the end part of one of the outer surfaces of the primary injection molding part, and the non-overlapping part of the secondary injection molding part is from the end part of the primary injection molding part. Is a molding method for molding a protruding synthetic resin injection molded product with an injection mold device, and the injection molding device comprising a plurality of mold parts is closed and the slide core is advanced to perform primary injection. A molding cavity is formed, a first resin is injected into the primary injection molding cavity by primary injection molding to form the primary injection molding, and then the slide core is retracted to form the outer surface of the primary injection molding. And forming a secondary injection molding cavity part surrounded by the overlapping surface of the primary injection molding part, the mold part and the slide core as an overlapping surface by exposing at least the end of the primary part, and when the slide core is retracted, injection molding The outer surface opposite to the overlapping surface of the primary injection molding portion is sucked by suction means from the inner surface side of the mold portion facing the slide core near the end of the cavity portion, and then the second injection molding cavity portion is Synthetic resin characterized by injecting a second resin by secondary injection molding to form a secondary injection molded part and overlapping and integrating a part of the secondary injection molded part on the overlapping surface of the primary injection molded part Molding method for injection molded products.   A primary injection molding cavity adjacent to a plurality of primary injection molding cavities for closing a mold of an injection molding device comprising a plurality of mold parts and advancing a slide core to form a plurality of primary injection molding parts The first resin is injected into the plurality of primary injection molding cavities by primary injection molding to form a plurality of primary injection molded parts, The slide core is retracted to form a secondary injection molding cavity that spans between the overlapping surface of the adjacent primary injection molding part and the end of the adjacent primary injection molding part surrounded by the mold part and the slide core. In addition, the outer surface on the opposite side to the overlapping surface of each primary injection molding portion from the inner surface side of the mold portion facing the slide core near the end portion of the adjacent cavity portion for primary injection molding when the slide core is retracted. Next, the second resin is injected into the secondary injection molding cavity by secondary injection molding to form a secondary injection molding portion and a part of the secondary injection molding portion is adjacent to each other. 2. The method for molding a synthetic resin injection-molded product according to claim 1, wherein each of the overlapping surfaces of the matching secondary injection molding portions is overlapped and integrated. An injection mold apparatus for molding the synthetic resin injection-molded product according to claim 1, wherein the mold apparatus comprises a plurality of mold parts, and a slide core that is provided on the mold part and is movable forward and backward. A first gate for injecting the first resin and a second gate for injecting the second resin,
Forming a primary injection molding cavity for molding the primary injection molding part by first injecting the first resin from the first gate by closing the plurality of mold parts and moving the slide core forward And
Closing the plurality of mold parts and retracting the slide core allows overlapping surfaces where at least end portions of the outer surface of the primary injection molded part formed in the primary injection molding cavity part are exposed, and the mold part, The space surrounded by the retracted slide core is formed as a secondary injection molding cavity for secondary injection of the second resin to form a secondary injection molding part,
A suction means for sucking the vicinity of the end of one outer surface of the primary injection molding portion when the slide core is retracted is provided at a portion of the mold portion facing the slide core near the end of the primary injection molding cavity. ,
An injection mold apparatus, wherein an overlapping surface of the primary injection molding part is located on a part of a projection surface of a cavity part for secondary injection molding projected from a moving direction of a slide core. An injection mold apparatus for molding the synthetic resin injection molded product according to claim 2,
By closing the plurality of mold parts and moving the slide core forward, a plurality of primary injection molding cavities are positioned such that the ends of adjacent primary injection molding cavities are spaced apart from each other. Forming,
Closing the plurality of mold parts and retracting the slide core allows overlapping surfaces where at least end portions of the outer surface of the primary injection molded part formed in the primary injection molding cavity part are exposed, and the mold part, Forming a space surrounded by the retracted slide core as a cavity for secondary injection molding,
Suction for sucking the vicinity of the end of one outer surface of the primary injection molding part to the part of the mold part facing the slide core near the end of each adjacent primary injection molding cavity part when the slide core is retracted Providing each means,
4. The injection molding according to claim 3, wherein the overlapping surfaces of the adjacent primary injection molding portions are respectively located on a part of the projection surface of the cavity portion for secondary injection molding projected from the moving direction of the slide core. Mold equipment.

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