JP2007001195A - Method for molding synthetic resin injection molded article and injection molding die apparatus - Google Patents

Method for molding synthetic resin injection molded article and injection molding die apparatus Download PDF

Info

Publication number
JP2007001195A
JP2007001195A JP2005185300A JP2005185300A JP2007001195A JP 2007001195 A JP2007001195 A JP 2007001195A JP 2005185300 A JP2005185300 A JP 2005185300A JP 2005185300 A JP2005185300 A JP 2005185300A JP 2007001195 A JP2007001195 A JP 2007001195A
Authority
JP
Japan
Prior art keywords
injection molding
cavity
primary injection
primary
mold
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2005185300A
Other languages
Japanese (ja)
Other versions
JP4658705B2 (en
Inventor
Hideki Sakai
秀樹 酒井
Nobuyuki Watanabe
信幸 渡邊
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gifu Plastic Industry Co Ltd
Original Assignee
Gifu Plastic Industry Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gifu Plastic Industry Co Ltd filed Critical Gifu Plastic Industry Co Ltd
Priority to JP2005185300A priority Critical patent/JP4658705B2/en
Publication of JP2007001195A publication Critical patent/JP2007001195A/en
Application granted granted Critical
Publication of JP4658705B2 publication Critical patent/JP4658705B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Abstract

<P>PROBLEM TO BE SOLVED: To enable molding a synthetic resin molded article of as exact appearance as is designed without generating a gap between an end part and a molding die part of a primary injection molding part of which the restriction by a slide core is released when forming a cavity for secondary injection molding by retreating the slide core. <P>SOLUTION: A cavity concave portion 9 for forming a protrusion communicating with a cavity portion 8 for primary injection molding is formed on an inner face of a molding die 6 facing with the slide core 7 in the vicinity of the end part of the cavity portion 8 for primary injection molding. A primary injection molded part 1 is molded by injecting a first resin 10 into the cavity portion 8 for primary injection molding as a primary injection molding; thereafter a cavity portion 13 for secondary injection molding is formed by retreating the slide core 7; and thereafter a secondary injection molded part 2 is molded by injecting a second resin 14 into the cavity portion 13 for secondary injection molding as a secondary injection molding while a part of the secondary injection molded part 2 is lapped to unite on a lapping face 12 of the primary injection molded part 1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、一次射出成形部に二次射出成形部を重複一体化した合成樹脂成形品の成形方法及び射出成形金型装置に関するものである。   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.

従来から一次射出成形部1の外面の端部に二次射出成形部2の一部の重複部3bを重複一体化すると共に該二次射出成形部2の非重複部3aが一次射出成形部1の端部よりも突出した合成樹脂射出成形品4を成形するための成形方法及び射出成形金型装置5が特許文献1により知られている。   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.

この特許文献1に示された従来例の射出成形金型装置5を用いて合成樹脂射出成形品4を製造する順序を模式的に図示すると図9乃至図12のようなものである。   The order in which the synthetic resin injection-molded product 4 is manufactured using the conventional injection mold apparatus 5 shown in Patent Document 1 is schematically shown in FIGS.

すなわち、図9に示すように固定金型部6aと可動金型部6bを型閉めすると共にスライドコア7を前進させて一次射出成形用キャビティ部8を形成し、次に図10に示すように上記一次射出成形用キャビティ部8に第一の樹脂10を一次射出成形により射出し、次に、図11に示すようにスライドコア7を後退させて二次射出成形用キャビティ部13を形成し、次に、図12に示すように二次射出成形用キャビティ部13に第二の樹脂14を二次射出成形により射出して二次射出成形部2を形成すると共に二次射出成形部2の一部を一次射出成形部1の外面の端部に重複一体化させるようになっている。   That is, as shown in FIG. 9, 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. 11 to form the secondary injection molding cavity 13. Next, as shown in FIG. 12, the second resin 14 is injected into the secondary injection molding cavity portion 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.

ところが、上記の従来例にあっては、一次射出成形用キャビティ部8に第一の樹脂10を一次射出成形で成形した後、スライドコア7を後退させて二次射出成形用キャビティ部13を形成するのであるが、この間に一次射出成形用キャビティ部8内に形成された一次射出成形部1の硬化が始まって収縮しようとする。この場合、一次射出成形部1の端部のスライドコア7に対向した部位はスライドコア7による規制が解除されるため、一次射出成形部1の端部と固定金型部6aのスライドコア7と対向した部分との間に一次射出成形部1の収縮により隙間(図11においてAで示す)が生じてしまう。このため、スライドコア7を後退させて形成した二次射出成形用キャビティ部に図12に示すように第二の樹脂14を二次射出成形により射出成形した場合、第二の樹脂14が上記一次射出成形部1の端部と固定金型部6との間の隙間Aに入り込み(図12においてBは上記隙間Aに入り込んだ第二の樹脂14を示す)、合成樹脂成形品4が設計通りの外観に成形できず、外観が悪くなって商品価値を低下させてしまうという問題があった。
特開平8−118421号公報
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 part 1 formed in the primary injection molding cavity part 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. 11) 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. 12 in the secondary injection molding cavity 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. 12 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 external appearance, and the external appearance deteriorated and the commercial value was lowered.
JP-A-8-118421

本発明は上記の従来の問題点に鑑みて発明したものであって、一次射出成形部に二次射出成形部を重複一体化した合成樹脂成形品を成形するに当たって、スライドコアを後退させて二次射出成形用キャビティ部を形成する際に、スライドコアによる規制が解除された一次射出成形部の端部と金型部との間に隙間が発生しないようにできて、設計通りの外観となった合成樹脂成形品を成形できる合成樹脂射出成形品の成形方法及び射出成形金型装置を提供することを課題とするものである。   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.

上記課題を解決するために本発明に係る合成樹脂射出成形品の成形方法は、一次射出成形部1の両外面のうち一方の外面の少なくとも端部に二次射出成形部2の一部が重複一体化すると共に該二次射出成形部2の非重複部3aが一次射出成形部1の端部よりも突出した合成樹脂射出成形品4を射出成形金型装置5で成形するための成形方法であって、複数の金型部6よりなる射出成形金型装置5を型閉めすると共にスライドコア7を前進させて一次射出成形用キャビティ部8を形成し、該一次射出成形用キャビティ部8の端部付近のスライドコア7と対向する金型部6内面に一次射出成形用キャビティ部8と連通する突部形成用キャビティ凹部9を形成し、一次射出成形用キャビティ部8に第一の樹脂10を一次射出成形により射出して、両外面のうち他方の外面の端部付近に突部11を突出した一次射出成形部1を成形し、次に、スライドコア7を後退させて一次射出成形部1の上記突部11を突出した外面と反対側の外面の少なくとも端部を露出させて重複面12とすると共に金型部6とスライドコア7と上記一次射出成形部1の重複面12とにより囲まれた二次射出成形用キャビティ部13を形成し、次に、二次射出成形用キャビティ部13に第二の樹脂14を二次射出成形により射出して二次射出成形部2を形成すると共に二次射出成形部2の一部を一次射出成形部1の上記重複面12に重複一体化させて成ることを特徴とするものである。   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 a primary injection molding cavity 8, and the end of the primary injection molding cavity 8 A protrusion-forming cavity concave portion 9 communicating with the primary injection molding cavity portion 8 is formed on the inner surface of the mold portion 6 facing the slide core 7 near the portion, and the first resin 10 is placed in the primary injection molding cavity portion 8. Both are injected by primary injection molding The primary injection molding part 1 which protruded the protrusion 11 in the vicinity of the edge part of the other outer surface among the surfaces is molded, and then the slide core 7 is moved backward to protrude the protrusion 11 of the primary injection molding part 1. At least the end of the outer surface on the opposite side is exposed to form the overlapping surface 12, and the cavity portion for secondary injection molding surrounded by the mold portion 6, the slide core 7 and the overlapping surface 12 of the primary injection molding portion 1 13, and then the second resin 14 is injected into the secondary injection molding cavity 13 by secondary injection molding to form the secondary injection molding part 2 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.

このような方法を採用することで、一次射出成形用キャビティ部8に第一の樹脂10を一次射出成形により射出した後に、スライドコア7を後退させて一次射出成形部1の上記突部11を突出した外面と反対側の外面の少なくとも端部を露出させて重複面12とすると共に金型部6とスライドコア7と上記一次射出成形部1の重複面12とにより囲まれた二次射出成形用キャビティ部13を形成する際、一次射出成形用キャビティ部8内に射出成形された一次射出成形部1の端部側においてスライドコア7による規制が解除され、一次射出成形部1の収縮により一次射出成形部1の端部と金型部6との間に隙間が生じようとするが、一次射出成形用キャビティ部8の端部付近のスライドコア7と対向する金型部6内面に一次射出成形用キャビティ部8と連通する突部形成用キャビティ凹部9を形成して一次射出成形部1の端部のスライドコア7と反対側の外面に突部11が成形されることになって、スライドコア7を後退させてスライドコア7による規制が解除された状態でも突部形成用キャビティ凹部9に充填形成された突部11の存在により一次射出成形部1の端部の収縮を規制し、一次射出成形部1の端部と金型部6との間に隙間が生じるのを防止し、その後における二次射出成形の際に一次射出成形部1と金型部6との間に第二の樹脂14が入り込むことがなく、これにより設計通りの外観となった合成樹脂成形品4を成形できる。   By adopting such a method, 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 so that the protrusion 11 of the primary injection molding portion 1 is moved. At least an end portion of the outer surface opposite to the protruding outer surface is exposed to form an overlapping surface 12 and secondary injection molding surrounded by the mold portion 6, the slide core 7, and the overlapping surface 12 of the primary injection molding portion 1. When the cavity portion 13 is formed, the restriction by the slide core 7 is released on the end portion side of the primary injection molding portion 1 injection molded in the primary injection molding cavity portion 8, and the primary injection molding portion 1 contracts to cause the primary A gap is likely to occur between the end of the injection molding part 1 and the mold part 6, but the primary injection is performed on the inner surface of the mold part 6 facing the slide core 7 near the end of the cavity part 8 for primary injection molding. Molding mold The protrusion 11 is formed on the outer surface opposite to the slide core 7 at the end of the primary injection molding part 1 by forming a cavity 9 for forming the protrusion communicating with the part 8. Even in a state where the restriction by the slide core 7 is released, the contraction of the end of the primary injection molding part 1 is regulated by the presence of the projection 11 filled and formed in the cavity 9 for forming the projection, and the primary injection molding is performed. It is possible to prevent a gap from being formed between the end portion of the portion 1 and the mold portion 6, and the second resin 14 between the primary injection molded portion 1 and the mold portion 6 during the subsequent secondary injection molding. This makes it possible to mold the synthetic resin molded product 4 having an appearance as designed.

また、複数の金型部6よりなる射出成形金型装置5を型閉めすると共にスライドコア7を前進させて複数の一次射出成形部1を形成するための複数の一次射出成形用キャビティ部8を隣接する一次射出成形用キャビティ部8の端部同士が距離を隔てて位置するように形成し、複数の一次射出成形用キャビティ部8に第一の樹脂10を一次射出成形により射出して複数の一次射出成形部1を成形し、次に、スライドコア7を後退させて金型部6とスライドコア7と上記隣合う一次射出成形部1の重複面12とにより囲まれた隣合う一次射出成形部1の端部間に跨る二次射出成形用キャビティ部13を形成し、次に、二次射出成形用キャビティ部13に第二の樹脂14を二次射出成形により射出して二次射出成形部2を形成すると共に二次射出成形部2の一部をそれぞれ隣合う二次射出成形部2の各重複面12に重複一体化させることが好ましい。   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. 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 mold part 6, the slide core 7 and the overlapping surface 12 of the adjacent primary injection molding part 1. A cavity portion 13 for secondary injection molding straddling between the end portions of the portion 1 is formed, and then a second resin 14 is injected into the cavity portion 13 for secondary injection molding by secondary injection molding to perform secondary injection molding. Forming part 2 and secondary injection molding It is overlapped integral part of the part 2 to each overlapping surface 12 of the adjacent secondary injection molding unit 2, respectively are preferred.

このような方法を採用することで、端部同士が距離を隔てて隣合う一次射出成形部1同士を二次射出成形部2で連結一体化した合成樹脂射出成形品4を射出成形により成形でき、しかも、この場合、二次射出成形の際に一次射出成形部1と金型部6との間に第二の樹脂14が入り込むことがなく、設計通りの外観となった合成樹脂成形品4を成形できる。   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.

また、本発明の射出成形金型装置5は、金型装置5が複数の金型部6よりなり、金型部6に設けた前進、後退自在なスライドコア7と、第一の樹脂10を射出するための第一のゲート15と、第二の樹脂14を射出するための第二のゲート16とを備え、上記複数の金型部6を型閉めし且つスライドコア7を前進させることで、第一のゲート15から第一の樹脂10を一次射出して一次射出成形部1を成形するための一次射出成形用キャビティ部8を形成し、該一次射出成形用キャビティ部8の端部付近のスライドコア7と対向する金型部6内面に一次射出成形部1の一方の外面の端部付近に一体に突出した突部11を成形するための一次射出成形用キャビティ部8と連通する突部形成用キャビティ凹部9を形成し、上記複数の金型部6を型閉めし且つスライドコア7を後退させることで、一次射出成形用キャビティ部8内に成形された一次射出成形部1の上記突部11を突出した外面と反対側の外面の少なくとも端部が露出した重複面12と、金型部6と、後退したスライドコア7とにより囲まれた空間を第二の樹脂14を二次射出して二次射出成形部2を成形するための二次射出成形用キャビティ部13として形成し、スライドコア7の移動方向から投影した二次射出成形用キャビティ部13の投影面の一部に上記一次射出成形部1の重複面12が位置していることを特徴とするものである。   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. The primary injection molding cavity 1 for molding the primary injection molding part 1 by primary injection of the first resin 10 from the first gate 15 is formed, and the vicinity of the end of the primary injection molding cavity 8 A protrusion communicating with a primary injection molding cavity 8 for forming a protrusion 11 integrally projecting near the end of one outer surface of the primary injection molding part 1 on the inner surface of the mold part 6 facing the slide core 7 Forming a cavity recess 9 for forming a part, and forming the plurality of mold parts 6 into a mold By overlapping and reversing the slide core 7, at least the end of the outer surface opposite to the outer surface from which the protruding portion 11 of the primary injection molded portion 1 formed in the primary injection molding cavity 8 is exposed is exposed. A secondary injection molding cavity for molding the secondary injection molding part 2 by secondary injection of the second resin 14 in the space surrounded by the surface 12, the mold part 6 and the retracted slide core 7. The overlapping surface 12 of the primary injection molding part 1 is located on a part of the projection surface of the cavity part 13 for secondary injection molding formed as a part 13 and projected from the moving direction of the slide core 7. Is.

このように一次射出成形用キャビティ部8の端部付近のスライドコア7と対向する金型部6内面に一次射出成形部1の一方の外面の端部付近に一体に突出した突部11を成形するための一次射出成形用キャビティ部8と連通する突部形成用キャビティ凹部9を形成するという簡単な構成とすることで、一次射出成形部1の端部と金型部6との間に隙間が生じるのを防止し、その後における二次射出成形の際に一次射出成形部1と金型部6との間に第二の樹脂14が入り込むことがない射出成型用金型装置5を提供できる。   In this way, the protrusion 11 integrally projecting near the end of one outer surface of the primary injection molding portion 1 is formed on the inner surface of the mold portion 6 facing the slide core 7 near the end of the cavity portion 8 for primary injection molding. By forming the projection forming cavity concave portion 9 communicating with the primary injection molding cavity portion 8 for the purpose, a gap is formed between the end portion of the primary injection molding portion 1 and the mold portion 6. Can be provided, and an injection mold apparatus 5 can be provided in which the second resin 14 does not enter between the primary injection molding part 1 and the mold part 6 in the subsequent secondary injection molding. .

また、複数の金型部6を型閉めし且つスライドコア7を前進させることで、複数の一次射出成形用キャビティ部8を、隣接する一次射出成形用キャビティ部8の端部同士が距離を隔てて位置するように形成し、該一次射出成形用キャビティ部8の端部付近のスライドコア7と対向する金型部6内面に一次射出成形部1の一方の外面の端部付近に一体に突出した突部11を成形するための一次射出成形用キャビティ部8と連通する突部形成用キャビティ凹部9を形成し、上記複数の金型部6を型閉めし且つスライドコア7を後退させることで、一次射出成形用キャビティ部内に成形された一次射出成形部1の上記突部11を突出した面と反対側の面の少なくとも端部が露出した重複面12と、金型部6と、後退したスライドコア7とにより囲まれた空間を二次射出成形用キャビティ部13として形成し、スライドコア7の移動方向から投影した二次射出成形用キャビティ13の投影面の一部に上記隣合う一次射出成形部1の重複面12がそれぞれ位置しているものであることが好ましい。   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. And is integrally projected near the end of one outer surface of the primary injection molded part 1 on the inner surface of the mold part 6 facing the slide core 7 near the end of the cavity 8 for primary injection molding. Forming a protrusion-forming cavity concave portion 9 communicating with the primary injection molding cavity portion 8 for forming the protruding portion 11, closing the plurality of mold portions 6, and retracting the slide core 7. The overlapping surface 12 where at least the end of the surface opposite to the surface projecting the protrusion 11 of the primary injection molded part 1 molded in the cavity for primary injection molding is exposed, and the mold part 6 are retracted. Surrounded by slide core 7 The space 12 is formed as a secondary injection molding cavity 13, and the overlapping surface 12 of the primary injection molding section 1 adjacent to the projection surface of the secondary injection molding cavity 13 projected from the moving direction of the slide core 7. It is preferable that each is located.

このような構成とすることで、端部同士が距離を隔てて隣合う一次射出成形部1同士を二次射出成形部2で連結一体化した合成樹脂射出成形品4を射出成形できると共に、二次射出成形の際に一次射出成形部1と金型部6との間に第二の樹脂14が入り込むことがなく、設計通りの外観となった合成樹脂成形品4を成形できる射出成形金型装置5を提供できる。   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.

本発明は、一次射出成形用キャビティ部の端部付近のスライドコアと対向する金型部内面に一次射出成形用キャビティ部と連通する突部形成用キャビティ凹部を形成するという簡単な構成で、二次射出成形の際に一次射出成形部と金型部との間に第二の樹脂が入り込むことがなく、設計通りの外観となった合成樹脂成形品を簡単に成形できる。   The present invention has a simple configuration in which a protrusion-forming cavity recess communicating with the primary injection molding cavity is formed on the inner surface of the mold part facing the slide core near the end of the primary injection molding cavity. In the next injection molding, the second resin does not enter between the primary injection molding part and the mold part, and a synthetic resin molded product having an appearance as designed can be easily molded.

以下、本発明を添付図面に示す実施形態に基いて説明する。   Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings.

本発明の合成樹脂射出成形品の成形方法及び射出成形金型装置により成形される合成樹脂成形品4は、図5に示すように、一次射出成形部1の両外面のうち一方の外面の少なくとも端部に二次射出成形部2の一部(重複部3b)が重複一体化すると共に該二次射出成形部2の非重複部3aが一次射出成形部1の端部よりも突出したものである。   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.

図5に示す実施形態では、複数の一次射出成形部1を二次射出成形部2で一体に連結した例が示してあり、更に本例では例えば、PP(ポリプロピレン)、PE(ポリエチレン)、HDPE(高密度ポリエチレン)、PC(ポリカーボネート)、PVC(塩化ビニル樹脂)、ABS樹脂等の硬質樹脂よりなる第一の樹脂10で一次射出成形部1を形成すると共に、例えば、TPE(エラストマー)、LDPE(低密度ポリエチレン)、EVA(エチレン酢酸ビニルコポリマー)等の軟質樹脂よりなる第二の樹脂14で二次射出成形部2を形成して、軟質樹脂よりなる二次射出成形部2の非重複部3aがヒンジ部を構成している例が示してある。   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.

図1には上記図5に示す合成樹脂成形品4を成形するための本発明の射出成形用金型装置5の一例が示してある。   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.

射出成形用金型装置5は、金型部6に設けた前進、後退自在なスライドコア7と、第一の樹脂10を射出するための第一のゲート15と、第二の樹脂14を射出するための第二のゲート16とを備えている。   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.

金型部6としては固定金型部6aと可動金型部6bとがあり、可動金型部6bの固定金型部6aと対向する面に凹所18が設けてあって、該凹所18にスライドコア7が前進、後退自在に内装してある(図1において矢印イが前進方向、矢印ロが後退方向を示す)。   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).

本発明においては、可動金型部6bは固定金型部6aに対して横方向(水平方向)又は上下方向(垂直方向)に移動自在となっており、可動金型部6bを移動することで型閉めしたり、型開きしたりするようになっている。また、スライドコア7は可動金型部6bに対して可動金型部6bの可動方向と同方向に移動自在となっている。   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.

上記固定金型部6aと可動金型部6bとを型閉めすると共にスライドコア7を前進させた状態で、固定金型部6aと可動金型部6bと前進させたスライドコア7とで囲まれた空間が一次射出成形用キャビティ部8として形成される。この一次射出成形用キャビティ部8は複数個形成されるもので、隣合う一次射出成形用キャビティ部8の端部同士は距離を介して隔てている。そして、スライドコア7は上記隣合う一次射出成形用キャビティ部8の端部間に跨るもので、スライドコア7の前面の中央部が、固定金型部6aの隣合う各一次射出成形用キャビティ部8の端部間の部位6a1に対向すると共にスライドコア7の前面の両側部がそれぞれ隣合う一次射出成形用キャビティ部8の端部の片側の内面を構成している。   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.

上記複数の一次成形用キャビティ部8は、固定金型部6a乃至可動金型部6bの対向面のいずれか一方又は両方に複数のキャビティ形成用凹部17を設けることで形成されるものであり、添付図面の実施形態では固定金型部6aに複数のキャビティ形成用凹部17を形成した例が示してある。   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.

一次成形用キャビティ部8の端部付近の固定金型部6aのスライドコア7と対向する内面には一次射出成形用キャビティ部8と連通する突部形成用キャビティ凹部9が形成してある。   A protrusion-forming cavity recess 9 communicating with the primary injection molding cavity 8 is formed on the inner surface of the fixed mold 6a near the end of the primary molding cavity 8 facing the slide core 7.

また、固定金型部6aと可動金型部6bとを型閉めした状態でスライドコア7のみを後退させることで、隣合う一次射出成形用キャビティ部8内にそれぞれ成形された一次射出成形部1の両外面のうちの一方の外面の端部がそれぞれ露出して、この隣合う一次射出成形用キャビティ部8内にそれぞれ成形された一次射出成形部1の露出面である重複面12と金型部6とスライドコア7とにより囲まれた二次射出成形用キャビティ部13となる空間が形成されるように構成してある。   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.

第一のゲート15、第二のゲート16はそれぞれ固定金型部6aに設けてあり、第一のゲート15は複数設けてあって、複数の一次射出成形用キャビティ部8にそれぞれ第一のゲート15が開口している。また、第二のゲート16は固定金型部6aの隣合う各一次射出成形用キャビティ部8の端部間の部位6a1に開口していて金型部6を型閉めすると共にスライドコア7を前進させた状態でスライドコア7の前端面が第二のゲート16に当接して閉じるようになっており、金型部6を型閉めすると共にスライドコア7を後退させて二次射出成形用キャビティ部13を形成した状態で第二のゲート16が二次射出成形用キャビティ部13に開口するように構成してある。   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.

上記のような射出成形用金型装置5を用いて合成樹脂射出成形品4を成形するには以下のようにして行うものである。   The synthetic resin injection molded product 4 is molded using the injection molding die device 5 as described above as follows.

まず、図1に示すように複数の金型部6を型閉めすると共にスライドコア7を前進させて一次射出成形用キャビティ部8を形成し、この一次射出成形用キャビティ部8に図2に示すように、第一のゲート15から第一の樹脂10を一次射出成形により射出して一次射出成形部1を成形する一次射出工程を実施する。   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.

この一次射出成形により一次射出成形用キャビティ部8内に一次射出成形部1が成形される。この場合、固定金型部6aのスライドコア7と対向する内面に一次射出成形用キャビティ部8と連通する突部形成用キャビティ凹部9が形成してあるので、該突部成形用キャビティ凹部9にも第一の樹脂10が射出されて一次射出成形部1の一方の外面の端部付近にリブ形状の突部11が一体に形成されることになる。   By this primary injection molding, the primary injection molding part 1 is molded in the cavity part 8 for primary injection molding. In this case, since a protrusion-forming cavity recess 9 communicating with the primary injection molding cavity 8 is formed on the inner surface of the fixed mold portion 6a facing the slide core 7, the protrusion-forming cavity recess 9 In addition, the first resin 10 is injected, and a rib-shaped protrusion 11 is integrally formed in the vicinity of the end of one outer surface of the primary injection molded portion 1.

次に、図3に示すように複数の金型部6を型閉めしたままの状態でスライドコア7を後退させて二次射出成形用キャビティ部13を形成する。   Next, as shown in FIG. 3, the secondary injection molding cavity 13 is formed by retracting the slide core 7 with the plurality of mold parts 6 being closed.

この場合、一次射出成形用キャビティ部8内に射出成形された一次射出成形部1の端部側においてスライドコア7による規制が解除されるので、一次射出成形部1の収縮により一次射出成形部1の端部と金型部6との間に隙間が生じようとするのであるが、本発明においては、上記のように一次射出成形用キャビティ部8の端部付近のスライドコア7と対向する金型部6内面に一次射出成形用キャビティ部8と連通する突部形成用キャビティ凹部9を形成して一次射出成形部1の端部のスライドコア7と反対側の外面に突部11が成形されるので、スライドコア7を後退させてスライドコア7による規制を解除しても上記突部11により一次射出成形部1の端部の収縮が規制されることになる。したがって、一次射出成形の後にスライドコア7を後退させて二次射出成形用キャビティ部13を形成する際に一次射出成形部1の端部と金型部6との間に隙間が生じるのが防止される。   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. However, in the present invention, the metal facing the slide core 7 in the vicinity of the end of the primary injection molding cavity 8 as described above is formed. A protrusion-forming cavity concave portion 9 communicating with the primary injection molding cavity portion 8 is formed on the inner surface of the mold portion 6, and the protrusion 11 is formed on the outer surface opposite to the slide core 7 at the end of the primary injection molding portion 1. Therefore, even if the slide core 7 is retracted and the restriction by the slide core 7 is released, the contraction of the end portion of the primary injection molded part 1 is restricted by the protrusion 11. 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.

次に、上記のようにして形成した二次射出成形用キャビティ部13に図4に示すように、第二のゲート16から第二の樹脂14を二次射出成形により射出して二次射出成形部2を成形すると共に距離を介して隣合う一次射出成形部1の片側の外面端部の重複面12に二次射出成形部2の両端部の重複部3bが重複一体化される。   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.

上記のように、スライドコア7を後退させて二次射出成形用キャビティ部13を形成する際、スライドコア7による一次射出成形部1の重複面12の規制が解除されるにもかかわらず、本発明では突部形成用キャビティ凹部9に充填形成された突部11の存在により一次射出成形部1の端部の収縮が規制されて一次射出成形部1の端部と金型部6との間に隙間が生じるのが防止されるので、二次射出成形により一次射出成形部1と金型部6との間に第二の樹脂14が入り込むことがない。   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 invention, the contraction of the end portion of the primary injection molding portion 1 is restricted by the presence of the projection 11 filled in the projection forming cavity concave portion 9, and the gap between the end portion of the primary injection molding portion 1 and the mold portion 6. Therefore, the second resin 14 does not enter between the primary injection molded part 1 and the mold part 6 by secondary injection molding.

このため、本発明によれば、一次射出成形部1に対しては二次射出成形部2を成形する第二の樹脂14が重複面以外の部位に滲み出た状態とならず、設計通りの外観となった美観に優れた合成樹脂成形品4を成形できる。   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.

上記のようにして二次射出成形を実行した後、射出成形用金型装置5を型開きして合成樹脂射出成形品4を取出す離型工程を実行する。   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.

これらの一連の型閉めから、一次射出成形、二次射出成形、離型工程という一連の工程は制御部(図示せず)の制御により実行するものである。   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).

本発明において、突部形成用キャビティ凹部9を設ける位置は図1のものにのみ限定されず、図6(a)、図6(b)のように固定金型部6aの一次射出成形用キャビティ部8の端部のスライドコア7の一端部に対向した範囲Mであれば、該スライドコア7に対向した範囲Mの巾内のどの位置に設けてもよく、また、該範囲Mに突部形成用キャビティ凹部9は一つだけでなく複数設けてもよいものである。   In the present invention, the position where the protrusion forming cavity concave portion 9 is provided is not limited to that shown in FIG. 1, but the primary injection molding cavity of the fixed mold portion 6a as shown in FIGS. 6 (a) and 6 (b). As long as it is in the range M facing one end of the slide core 7 at the end of the portion 8, it may be provided at any position within the width of the range M facing the slide core 7. The number of forming cavity recesses 9 is not limited to one, and a plurality of them may be provided.

なお、図7に示すように隣合う一次射出成形用キャビティ部8の端部にスライドコア7の両端部が対向する場合、固定金型部6aの一方の一次射出成形用キャビティ部8の端部のスライドコア7に対向した範囲M1の巾が狭くスライドコア7を後退させても一次射出成形部1の端部が収縮して一次射出成形部1と金型部6との間に隙間が生じるような恐れがない場合には、固定金型部6aの他方の一次射出成形用キャビティ部8の端部のスライドコア7に対向した範囲M2の巾が広くなった箇所にのみ突部形成用キャビティ凹部9を設けるようにしてもよい。   As shown in FIG. 7, 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 risk, the protrusion-forming cavity is formed only in a 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 portion 6a is wide. A recess 9 may be provided.

また、図5に示す実施形態では突部11が一次射出成形部1の二次射出成形部2との重複面と反対側の外面に図5のX方向(図5においては二次射出成形部1の長手方向)に長い突部11が突設した合成樹脂射出成形品4を成形するようになっており、これにより一次射出成形部1を第一の樹脂10の射出成形で成形した後、スライドコア7を後退させて二次射出用キャビティ部13を形成した際に、主として一次射出成形部1が図5におけるY方向に収縮するのを規制するようにしている例を示しているが、上記X方向に長い突部11が長手方向に不連続となるように突設したものであってもよく、また、図8(a)、(b)のように一次射出成形部1の二次射出成形部2との重複面と反対側の外面に上記のようにY方向に収縮するのを規制するようにX方向に長い突部11と、X方向の収縮を規制するようにY方向に長くなった突部11を突設した合成樹脂射出成形品4を成形するようにしてもよい。また、図示を省略しているが、X方向の収縮を規制するようにY方向に長くなった突部11のみを突設した合成樹脂射出成形品4を成形するようにしてもよく、更に、図8(c)のように柱状をした突部11をX方向に複数個又はY方向に複数個、あるいはX、Y両方向にそれぞれ複数個突設した合成樹脂射出成形品4を成形するようにしてもよい。   Further, in the embodiment shown in FIG. 5, the protrusion 11 is formed on the outer surface of the primary injection molding part 1 opposite to the overlapping surface with the secondary injection molding part 2 in the X direction of FIG. 5 (in FIG. 5, the secondary injection molding part). 1), a synthetic resin injection-molded product 4 having a long projection 11 projecting from the first resin 10 is molded. Thus, after the primary injection molded portion 1 is molded by injection molding of the first resin 10, Although the slide core 7 is retracted and the secondary injection cavity 13 is formed, the primary injection molding part 1 is mainly restricted from contracting in the Y direction in FIG. The protrusion 11 that is long in the X direction may be provided so as to be discontinuous in the longitudinal direction, and the secondary of the primary injection molded part 1 as shown in FIGS. 8 (a) and 8 (b). The outer surface opposite to the overlapping surface with the injection molding part 2 is restricted from contracting in the Y direction as described above. Long projection 11 in the X direction so as to, it may be molded of a synthetic resin injection molded article 4 projecting from the projection 11 which is longer in the Y direction so as to regulate the contraction of the X-direction. Although not shown in the figure, the synthetic resin injection molded product 4 in which only the protrusion 11 that is long in the Y direction is protruded so as to restrict contraction in the X direction may be molded. As shown in FIG. 8 (c), a synthetic resin injection molded product 4 having a plurality of columnar protrusions 11 protruding in the X direction, a plurality of protrusions 11 in the Y direction, or a plurality of protrusions 11 in both the X and Y directions is formed. May be.

なお、図5、図7、図8のように二次射出成形部2の両側部の重複部3bをそれぞれ距離を隔てて隣合う一次射出成形部1の端部に積層一体化したものにおいて、一次射出成形部1を形成するための第一の樹脂10が硬質樹脂で、二次射出成形部2を形成するための第二の樹脂23が軟質樹脂であると、二次射出成形部2の中間部の非重複部3a(つまり、二次射出成形部2の中間部の非重複部3aは両一次射出成形部1の端部よりそれぞれ突出した部分である)がヒンジ部となり、硬質の第一の樹脂10よりなる一次射出成形部1同士を軟質の第二の樹脂14よりなるヒンジ部により折り曲げ自在に一体に連結できることになる。   In addition, as shown in FIGS. 5, 7, and 8, the overlapping portions 3 b on both sides of the secondary injection molding portion 2 are laminated and integrated at the end portions of the primary injection molding portions 1 adjacent to each other at a distance. When the first resin 10 for forming the primary injection molded part 1 is a hard resin and the second resin 23 for forming the secondary injection molded part 2 is a soft resin, the secondary injection molded part 2 The non-overlapping part 3a of the intermediate part (that is, the non-overlapping part 3a of 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, The primary injection molded parts 1 made of one resin 10 can be integrally connected to each other by a hinge part made of a soft second resin 14 so as to be foldable.

本発明の射出成形金型装置の型閉め状態の断面図である。It is sectional drawing of the mold closing state of the injection mold apparatus of this invention. 同上の一次射出成形用キャビティ部に一次射出成形により第一の樹脂を充填して一次射出成形部を形成した状態の射出成形金型装置の断面図である。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. 同上の二次射出成形用キャビティ部を形成した段階の射出成形金型装置の断面図である。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. 同上の二次射出成形用キャビティ部に二次射出成形により第二の樹脂を充填して二次射出成形部を形成した段階の射出成形金型装置の断面図である。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. 同上により成形した合成樹脂射出成形品の一例を示し、(a)は斜視図であり、(b)は断面図である。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)(b)(c)はそれぞれ本発明の他の実施形態を示す射出成形金型装置の型閉め状態の断面図である。(A) (b) (c) is sectional drawing of the mold closing state of the injection mold apparatus which shows other embodiment of this invention, respectively. (a)は本発明の他の実施形態の射出成形金型装置の型閉め状態の断面図であり、(b)は同上で製造した合成樹脂射出成形品の断面図である。(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. (a)(b)(c)はそれぞれ本発明により成形した合成樹脂射出成形品の他例を示す斜視図である。(A) (b) (c) is a perspective view which shows the other example of the synthetic resin injection molded product shape | molded by this invention, respectively. 従来例の射出成形金型装置の型閉め状態の断面図である。It is sectional drawing of the mold closing state of the injection molding die apparatus of a prior art example. 同上の一次射出成形用キャビティ部に一次射出成形により第一の樹脂を充填して一次射出成形部を形成した状態の射出成形金型装置の断面図である。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. 同上の二次射出成形用キャビティ部を形成した段階の射出成形金型装置の断面図である。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. 同上の二次射出成形用キャビティ部に二次射出成形により第二の樹脂を充填して二次射出成形部を形成した段階の射出成形金型装置の断面図である。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.

符号の説明Explanation of symbols

1 一次射出成形部
2 二次射出成形部
3a 非重複部
4 合成樹脂射出成形品
5 射出成形金型装置
6 金型部
7 スライドコア
8 一次射出成形用キャビティ部
9 突部形成用キャビティ凹部
10 第一の樹脂
11 突部
12 重複面
13 二次射出成形用キャビティ部
14 第二の樹脂
15 第一のゲート
16 第二のゲート
DESCRIPTION OF SYMBOLS 1 Primary injection molding part 2 Secondary injection molding part 3a Non-overlapping part 4 Synthetic resin injection molded article 5 Injection mold apparatus 6 Mold part 7 Slide core 8 Cavity part for primary injection molding 9 Cavity recessed part for protrusion formation 10 1st One resin 11 Projection portion 12 Overlapping surface 13 Secondary injection molding cavity portion 14 Second resin 15 First gate 16 Second gate

Claims (4)

一次射出成形部の両外面のうち一方の外面の少なくとも端部に二次射出成形部の一部が重複一体化すると共に該二次射出成形部の非重複部が一次射出成形部の端部よりも突出した合成樹脂射出成形品を射出成形金型装置で成形するための成形方法であって、複数の金型部よりなる射出成形金型装置を型閉めすると共にスライドコアを前進させて一次射出成形用キャビティ部を形成し、該一次射出成形用キャビティ部の端部付近のスライドコアと対向する金型部内面に一次射出成形用キャビティ部と連通する突部形成用キャビティ凹部を形成し、一次射出成形用キャビティ部に第一の樹脂を一次射出成形により射出して、両外面のうち他方の外面の端部付近に突部を突出した一次射出成形部を成形し、次に、スライドコアを後退させて一次射出成形部の上記突部を突出した外面と反対側の外面の少なくとも端部を露出させて重複面とすると共に金型部とスライドコアと上記一次射出成形部の重複面とにより囲まれた二次射出成形用キャビティ部を形成し、次に、二次射出成形用キャビティ部に第二の樹脂を二次射出成形により射出して二次射出成形部を形成すると共に二次射出成形部の一部を一次射出成形部の上記重複面に重複一体化させることを特徴とする合成樹脂射出成形品の成形方法。   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. Forming a cavity for molding, forming a cavity for forming a projecting portion communicating with the cavity for primary injection molding on the inner surface of the mold part facing the slide core near the end of the cavity for primary injection molding, The first resin is injected into the injection molding cavity by primary injection molding to form a primary injection molding part with a protrusion protruding near the end of the other outer surface of both outer surfaces, and then the slide core is Retreat and primary injection The secondary part surrounded by the mold part, the slide core, and the overlapping surface of the primary injection molding part while exposing at least the end part of the outer surface opposite to the protruding outer surface of the shape part to form the overlapping surface The injection molding cavity part is formed, and then the second resin is injected into the secondary injection molding cavity part by secondary injection molding to form the secondary injection molding part and a part of the secondary injection molding part. A method for molding a synthetic resin injection-molded product, characterized in that: 複数の金型部よりなる射出成形金型装置を型閉めすると共にスライドコアを前進させて複数の一次射出成形部を形成するための複数の一次射出成形用キャビティ部を隣接する一次射出成形用キャビティ部の端部同士が距離を隔てて位置するように形成し、複数の一次射出成形用キャビティ部に第一の樹脂を一次射出成形により射出して複数の一次射出成形部を成形し、次に、スライドコアを後退させて金型部とスライドコアと上記隣合う一次射出成形部の重複面とにより囲まれた隣合う一次射出成形部の端部間に跨る二次射出成形用キャビティ部を形成し、次に、二次射出成形用キャビティ部に第二の樹脂を二次射出成形により射出して二次射出成形部を形成すると共に二次射出成形部の一部をそれぞれ隣合う二次射出成形部の各重複面に重複一体化させることを特徴とする請求項1記載の合成樹脂射出成形品の成形方法。   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, , Retreat the slide core to form a secondary injection molding cavity that spans between the end of the adjacent primary injection molding part surrounded by the mold part, the slide core and the overlapping surface of the adjacent primary injection molding part Next, a second resin is injected into the secondary injection molding cavity by secondary injection molding to form a secondary injection molding part, and a part of the secondary injection molding part is adjacent to the secondary injection. It overlaps each overlapping surface of the molding part. Molding process of synthetic resin injection molded article according to claim 1, characterized in that to integrate. 請求項1記載の合成樹脂射出成形品を成形するための射出成形金型装置であって、金型装置が複数の金型部よりなり、金型部に設けた前進、後退自在なスライドコアと、第一の樹脂を射出するための第一のゲートと、第二の樹脂を射出するための第二のゲートとを備え、
上記複数の金型部を型閉めし且つスライドコアを前進させることで、第一のゲートから第一の樹脂を一次射出して一次射出成形部を成形するための一次射出成形用キャビティ部を形成し、該一次射出成形用キャビティ部の端部付近のスライドコアと対向する金型部内面に一次射出成形部の一方の外面の端部付近に一体に突出した突部を成形するための一次射出成形用キャビティ部と連通する突部形成用キャビティ凹部を形成し、
上記複数の金型部を型閉めし且つスライドコアを後退させることで、一次射出成形用キャビティ部内に成形された一次射出成形部の上記突部を突出した外面と反対側の外面の少なくとも端部が露出した重複面と、金型部と、後退したスライドコアとにより囲まれた空間を第二の樹脂を二次射出して二次射出成形部を成形するための二次射出成形用キャビティ部として形成し、スライドコアの移動方向から投影した二次射出成形用キャビティ部の投影面の一部に上記一次射出成形部の重複面が位置していることを特徴とする射出成形金型装置。
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 Primary injection molding for forming a protrusion integrally projecting near the end of one outer surface of the primary injection molding part on the inner surface of the mold part facing the slide core near the end of the cavity part for primary injection molding Forming a protrusion-forming cavity recess communicating with the molding cavity,
Closing the plurality of mold parts and retracting the slide core allows at least an end part of the outer surface opposite to the outer surface protruding from the protruding part of the primary injection molded part formed in the cavity part for primary injection molding. Secondary injection molding cavity for forming a secondary injection molding part by secondary injection of the second resin in the space surrounded by the overlapping surface where the mold is exposed, the mold part and the retracted slide core An injection mold apparatus in which the overlapping surface of the primary injection molding part is located on a part of the projection surface of the cavity part for secondary injection molding that is formed as projected from the moving direction of the slide core.
請求項2記載の合成樹脂射出成形品を成形するための射出成形金型装置であって、
上記複数の金型部を型閉めし且つスライドコアを前進させることで、複数の一次射出成形用キャビティ部を、隣接する一次射出成形用キャビティ部の端部同士が距離を隔てて位置するように形成し、該一次射出成形用キャビティ部の端部付近のスライドコアと対向する金型部内面に一次射出成形部の一方の外面の端部付近に一体に突出した突部を成形するための一次射出成形用キャビティ部と連通する突部形成用キャビティ凹部を形成し、
上記複数の金型部を型閉めし且つスライドコアを後退させることで、一次射出成形用キャビティ部内に成形された一次射出成形部の上記突部を突出した面と反対側の面の少なくとも端部が露出した重複面と、金型部と、後退したスライドコアとにより囲まれた空間を二次射出成形用キャビティ部として形成し、スライドコアの移動方向から投影した二次射出成形用キャビティ部の投影面の一部に上記隣合う一次射出成形部の重複面がそれぞれ位置していることを特徴とする請求項3記載の射出成形金型装置。



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. A primary for forming and projecting a protrusion integrally projecting near the end of one outer surface of the primary injection molding part on the inner surface of the mold part facing the slide core near the end of the cavity part for primary injection molding Forming a protrusion-forming cavity recess communicating with the injection molding cavity,
By closing the plurality of mold parts and retracting the slide core, at least the end part of the surface opposite to the surface projecting from the protruding part of the primary injection molded part formed in the cavity part for primary injection molding Is formed as a secondary injection molding cavity part, which is surrounded by the exposed overlapping surface, the mold part, and the retracted slide core, and the secondary injection molding cavity part projected from the moving direction of the slide core. 4. The injection mold apparatus according to claim 3, wherein overlapping surfaces of the adjacent primary injection molding portions are respectively located on a part of the projection surface.



JP2005185300A 2005-06-24 2005-06-24 Method for molding synthetic resin injection molded product and injection mold apparatus Active JP4658705B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2005185300A JP4658705B2 (en) 2005-06-24 2005-06-24 Method for molding synthetic resin injection molded product and injection mold apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2005185300A JP4658705B2 (en) 2005-06-24 2005-06-24 Method for molding synthetic resin injection molded product and injection mold apparatus

Publications (2)

Publication Number Publication Date
JP2007001195A true JP2007001195A (en) 2007-01-11
JP4658705B2 JP4658705B2 (en) 2011-03-23

Family

ID=37687215

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2005185300A Active JP4658705B2 (en) 2005-06-24 2005-06-24 Method for molding synthetic resin injection molded product and injection mold apparatus

Country Status (1)

Country Link
JP (1) JP4658705B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008195059A (en) * 2007-01-16 2008-08-28 Oshima Denki Seisakusho:Kk Injection molded object, its manufacturing method and mold for manufacturing injection molded object
JP2014091549A (en) * 2012-11-02 2014-05-19 Sanko Co Ltd Wall structure of carrying container and manufacturing method of carrying container

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS544957A (en) * 1977-06-14 1979-01-16 Japan Steel Works Ltd Manufacture of multiicolor and multiimaterial resin moldings
JPS6176333A (en) * 1985-07-31 1986-04-18 Nissei Plastics Ind Co Jointing method among molded articles by injection molding
JPS62271712A (en) * 1986-05-21 1987-11-26 Fuji Rubber Kk Method of molding displaying part of contact point rubber letter
JPH04166315A (en) * 1990-10-30 1992-06-12 Alps Electric Co Ltd Key top
JPH0715793A (en) * 1993-06-28 1995-01-17 Sony Corp Diaphragm for speaker and its molding method
JPH0872096A (en) * 1994-09-02 1996-03-19 Inoac Corp Multicolor in-mold coating molding method for rim molding and mold therefor
JPH08118421A (en) * 1994-10-24 1996-05-14 Hamaguchi Jushi Kogyo Kk Two material molding method, mold assembly and speaker
JPH09193193A (en) * 1996-01-18 1997-07-29 Nissha Printing Co Ltd Manufacture of key pad and the key pad
JPH09239779A (en) * 1996-03-12 1997-09-16 Nissha Printing Co Ltd Method and mold for producing key pad
JP2003011152A (en) * 2001-06-28 2003-01-15 Nippon Zeon Co Ltd Molded product with coating film and manufacturing method therefor
WO2005046958A1 (en) * 2003-11-17 2005-05-26 Rimtec Corporation Method of in-mold coating

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS544957A (en) * 1977-06-14 1979-01-16 Japan Steel Works Ltd Manufacture of multiicolor and multiimaterial resin moldings
JPS6176333A (en) * 1985-07-31 1986-04-18 Nissei Plastics Ind Co Jointing method among molded articles by injection molding
JPS62271712A (en) * 1986-05-21 1987-11-26 Fuji Rubber Kk Method of molding displaying part of contact point rubber letter
JPH04166315A (en) * 1990-10-30 1992-06-12 Alps Electric Co Ltd Key top
JPH0715793A (en) * 1993-06-28 1995-01-17 Sony Corp Diaphragm for speaker and its molding method
JPH0872096A (en) * 1994-09-02 1996-03-19 Inoac Corp Multicolor in-mold coating molding method for rim molding and mold therefor
JPH08118421A (en) * 1994-10-24 1996-05-14 Hamaguchi Jushi Kogyo Kk Two material molding method, mold assembly and speaker
JPH09193193A (en) * 1996-01-18 1997-07-29 Nissha Printing Co Ltd Manufacture of key pad and the key pad
JPH09239779A (en) * 1996-03-12 1997-09-16 Nissha Printing Co Ltd Method and mold for producing key pad
JP2003011152A (en) * 2001-06-28 2003-01-15 Nippon Zeon Co Ltd Molded product with coating film and manufacturing method therefor
WO2005046958A1 (en) * 2003-11-17 2005-05-26 Rimtec Corporation Method of in-mold coating

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008195059A (en) * 2007-01-16 2008-08-28 Oshima Denki Seisakusho:Kk Injection molded object, its manufacturing method and mold for manufacturing injection molded object
JP2014091549A (en) * 2012-11-02 2014-05-19 Sanko Co Ltd Wall structure of carrying container and manufacturing method of carrying container

Also Published As

Publication number Publication date
JP4658705B2 (en) 2011-03-23

Similar Documents

Publication Publication Date Title
JP2010125784A (en) Mold apparatus for dichromatic molding, and dichromatic molding article
JP6275669B2 (en) Resin products
JP2007001197A (en) Molding method of synthetic resin injection-molded product and injection mold assembly
JP4658705B2 (en) Method for molding synthetic resin injection molded product and injection mold apparatus
JP5422307B2 (en) Two-color injection molding method for resin windows
JP4648109B2 (en) Method for molding synthetic resin injection molded product and injection mold apparatus
JP4648110B2 (en) Synthetic resin injection molded products
JP2016083781A (en) Metal mold for insert molding, method of insert-molding using metal mold
JP6910705B2 (en) Manufacturing method of multi-layer member
JP2011126121A (en) Injection molding method and panel
WO2016052235A1 (en) Pillar garnish manufacturing method
JP4365707B2 (en) Molding method of injection molding with hinge
CN109153191B (en) Resin product
JP5860773B2 (en) Mold for resin molding and molding method
JP6929000B2 (en) Resin panel parts and their manufacturing methods
JP4313709B2 (en) Method of molding synthetic resin injection molded product and mold apparatus for injection molding
JP4407810B2 (en) In-mold coating mold
JP4589826B2 (en) Method for molding synthetic resin injection molded product and injection mold apparatus
JP2004291324A (en) Mold for multicolor molding and multicolor molding method
JPH10264202A (en) Production of composite synthetic resin molded product
JP7175749B2 (en) injection molding method
JP6771873B2 (en) Resin molded products and their manufacturing methods
JP6374126B2 (en) Resin products
JP5169780B2 (en) In-mold coating mold
JP6647886B2 (en) Mold

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20080317

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20100726

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20100810

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20101012

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20101102

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20101206

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20101221

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20101224

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20140107

Year of fee payment: 3

R150 Certificate of patent or registration of utility model

Ref document number: 4658705

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

Free format text: JAPANESE INTERMEDIATE CODE: R150

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250