JPH0316253B2 - - Google Patents
Info
- Publication number
- JPH0316253B2 JPH0316253B2 JP5213982A JP5213982A JPH0316253B2 JP H0316253 B2 JPH0316253 B2 JP H0316253B2 JP 5213982 A JP5213982 A JP 5213982A JP 5213982 A JP5213982 A JP 5213982A JP H0316253 B2 JPH0316253 B2 JP H0316253B2
- Authority
- JP
- Japan
- Prior art keywords
- injection
- weather strip
- molding
- relief
- parts
- 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.)
- Expired
Links
- 238000002347 injection Methods 0.000 claims description 32
- 239000007924 injection Substances 0.000 claims description 32
- 238000000034 method Methods 0.000 claims description 17
- 238000000465 moulding Methods 0.000 claims description 13
- 238000001746 injection moulding Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 description 7
- 239000004744 fabric Substances 0.000 description 5
- 238000001125 extrusion Methods 0.000 description 4
- 238000004073 vulcanization Methods 0.000 description 3
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 239000005038 ethylene vinyl acetate Substances 0.000 description 2
- 239000012943 hotmelt Substances 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012778 molding material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14336—Coating a portion of the article, e.g. the edge of the article
- B29C45/14409—Coating profiles or strips by injecting end or corner or intermediate parts
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
本発明は予め成形された成形品の端部に注入成
形法により注入部を一体に成形するための注入部
形成方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming an injection part for integrally forming an injection part on the end of a preformed molded article by an injection molding method.
従来における、予め成形された成形品の端部に
注入成形法により注入部を一体に成形するための
方法としては、第１図イ及び第１図ロに示したも
のがある。第１，２図はその具体例として自動車
用のウエザーストリツプを示したものであり、ま
ずその構造について概説すると、１は自動車のサ
イドウインド用のウエザーストリツプであり、車
体開口部のフランジに嵌合する断面略Ｕ字形であ
つて、その内部に芯金２が埋設されたウエルト部
３と、該ウエルト部３の内側面に設けられた保持
リツプ４と、外側面にスポンジゴム等で形成され
た柔軟なシールリツプ５、及び水切りリツプ６と
からなり、直状部１ａ，１ａは予め押出連続加硫
成形法により成形されている。そしてコーナー部
１ｂを形成し、かつその両端部に直状部１ａ，１
ａを接合させるに際しては、第２図に示したよう
な、８ａ，８ｂ，８ｃ，８ｄ，８ｅの分割型から
なり、ウエザーストリツプ１の直状部１ａの断面
形状と同断面であり、コーナー部１ｂと同形状の
注入部７を有する金型８を用い、該金型８の所定
位置に、予め成形されている直状部１ａ，１ａを
対置し、注入部７内に未加硫ゴム、若しくはエチ
レンビニルアセテート（Ｅ、Ｖ、Ａ）等のホツト
メルト系樹脂等の生地を注入し、コーナー部１ｂ
を成形するとともに、該コーナー部１ｂの両端部
に直状部１ａ，１ｂを接合せしめるのである。こ
の注入成形法に用いられる前記金型８にはさら
に、注入部７のシールリツプ成形部７ａ、水切り
リツプ成形部７ｂの先端部に、内径0.5〜1.0mmの
入路１０を有する生地逃げ注入部９ａ，９ｂが設
けられており、一方注入する生地は若干多目にし
注入部７への充填の完全を図り、充填後の過剰生
地を前記生地逃げ注入部９ａ，９ｂに逃して、生
地の注入量の不均一を吸収するのである。したが
つて注入量が多い時には生地逃げ注入部９ａ，９
ｂは充填され、少目の場合には少量の生地のみが
流入することとなり、その成形形状は不均一とな
るが、この生地逃げ注入部９ａ，９ｂによつて成
形された部分は、後述の工程によつて切除される
ものであるから問題はない。 As a conventional method for integrally molding an injection part on the end of a preformed molded product by injection molding, there is a method shown in FIGS. 1A and 1B. Figures 1 and 2 show a weather strip for an automobile as a specific example. First, to outline its structure, 1 is a weather strip for the side window of an automobile, and it is designed for the opening of the car body. A welt part 3 which is approximately U-shaped in cross section and fits into the flange and has a core metal 2 embedded therein, a retaining lip 4 provided on the inner surface of the welt part 3, and a sponge rubber etc. on the outer surface. The straight portions 1a, 1a are formed in advance by extrusion continuous vulcanization molding. Then, a corner portion 1b is formed, and straight portions 1a, 1 are formed at both ends of the corner portion 1b.
When joining a, it consists of divided molds 8a, 8b, 8c, 8d, and 8e as shown in FIG. Using a mold 8 having an injection part 7 having the same shape as the corner part 1b, pre-formed straight parts 1a, 1a are placed opposite each other at a predetermined position of the mold 8, and an unvulcanized injector is placed inside the injection part 7. A material such as rubber or hot melt resin such as ethylene vinyl acetate (E, V, A) is injected into the corner portion 1b.
At the same time, the straight parts 1a and 1b are joined to both ends of the corner part 1b. The mold 8 used in this injection molding method further includes a dough recess injection part 9a having an inlet passage 10 with an inner diameter of 0.5 to 1.0 mm at the tip of the seal lip forming part 7a and draining lip forming part 7b of the injection part 7. . It absorbs the non-uniformity of Therefore, when the amount of injection is large, the fabric relief injection parts 9a, 9
b is filled, and if it is small, only a small amount of dough will flow in, and the molded shape will be uneven, but the portion molded by the dough relief injection parts 9a and 9b will be as described below. There is no problem since it is removed during the process.
以上の工程によつて成形されたウエザーストリ
ツプは、第１図に示したように注入成形法によつ
て成形されたコーナー部１ｂの両端部に直状部１
ａ，１ａが設けられた形状となる他、前記入路１
０と生地逃げ注入部９ａ，９ｂとによつて成形さ
れた、不要な逃げ部１１が生ずることとなるが、
これを破線で示したように、その基端部より切除
して、サイドウインド用のウエザーストリツプ１
を完成させるのである。 The weather strip formed by the above process has straight parts 1 at both ends of the corner part 1b formed by the injection molding method, as shown in FIG.
a, 1a, and the input path 1
0 and the dough relief injection parts 9a and 9b, an unnecessary relief part 11 will be formed,
As shown by the broken line, cut it out from the base end and make the weather strip 1 for the side window.
is completed.
しかしながらこの従来の成形方法によると、前
記の如くその成形工程において、不要な逃げ部１
１が、シールリツプ５、水切りリツプ６の先端部
に生じてしまうことから、これを切除するという
工程を必要とする他、切除跡が外観上好ましくな
く、切除状態によつては、それを原因として亀裂
が生ずる原因ともなる。又特に図示した具体例の
如く、成形対象がウエザーストリツプである場合
には、シールリツプ５、水切りリツプ６の当該部
がシール面であることから、切除面が不均一の場
合には、シール性が悪化し、水洩れの原因ともな
る。 However, according to this conventional molding method, as described above, in the molding process, unnecessary escape parts
1 occurs at the tips of the sealing lip 5 and draining lip 6, which requires a process of cutting it out.In addition, the cutout mark is unfavorable in appearance, and depending on the state of removal, this may be the cause. It can also cause cracks to form. In addition, especially when the object to be molded is a weather strip as in the specific example shown in the figure, since the relevant parts of the seal lip 5 and draining lip 6 are the sealing surfaces, if the cut surfaces are uneven, the sealing This can lead to poor performance and water leakage.
本発明は、前記従来例のかかる問題点に鑑みて
なされたものであり、成形品の外観及び特性に影
響を及ぼさない部位に、注入部成形生地の逃げ部
を形成するようにすることにより、前記問題点を
解決することを目的とするものである。 The present invention has been made in view of the above-mentioned problems of the conventional example, and by forming a relief part of the injection part molding material in a region that does not affect the appearance and characteristics of the molded product, The purpose is to solve the above-mentioned problems.
以下本発明の構成について、第３図乃至第５図
に示した一実施例に従つて説明する。 The configuration of the present invention will be explained below according to an embodiment shown in FIGS. 3 to 5.
本実施例においても具体的成形対象は、自動車
のサイドウインド用ウエザーストリツプであり、
その構成について第３図イ及び第３図ロについて
述べると、断面略Ｕ字形であつて、その内部に芯
金２が埋設されたウエルト部３と、該ウエルト部
３の内側面に設けられた保持リツプ４、外側面に
形成されたシールリツプ５、水切りリツプ６とか
らなり、押出連続加硫成形法により成形された直
状部１ａ，１ａと、注入成形法によつて成形され
たコーナー部１ｂよりなる。 In this example as well, the specific molding target is a weather strip for an automobile side window.
The structure is described with reference to FIG. 3 A and FIG. It consists of a holding lip 4, a sealing lip 5 formed on the outer surface, and a draining lip 6, and includes straight parts 1a, 1a formed by extrusion continuous vulcanization, and corner parts 1b formed by injection molding. It becomes more.
そしてこのコーナー部１ｂの成形に際して用い
られる金型８は、第４図に示したように、８ａ，
８ｂ，８ｃ，８ｄ，８ｅの分割型からなり、ウエ
ザーストリツプ１の直状部１ａの断面形状と同断
面であり、コーナー部１ｂと同形状の注入部７を
有し、かつ、注入部７の成形時に直状部１ａの接
合端部が嵌合される部位であつて、シールリツプ
成形部７ａ及び水切りリツプ成形部７ｂのシール
裏面接面側７a′，７b′には、生地逃げ注入部９
ａ，９ｂが形成されている。 As shown in FIG.
It is made up of split molds 8b, 8c, 8d, and 8e, has the same cross-sectional shape as the straight part 1a of the weather strip 1, has an injection part 7 of the same shape as the corner part 1b, and has an injection part 7 of the same shape as the corner part 1b. There are fabric relief injection parts on the seal back surface sides 7a' and 7b' of the seal lip molding part 7a and draining lip molding part 7b, which are the parts where the joining end of the straight part 1a is fitted during the molding of step 7. 9
a, 9b are formed.
そしてコーナー部１ｂの成形に際しては、第５
図に示したように金型８に予め成形されている直
状部１ａ，１ａを対置し、注入部７内に未加硫ゴ
ム、若しくはエチレンビニルアセテート（Ｅ、
Ｖ、Ａ）等のホツトメルト系樹脂等の生地を注入
する。その注入量は前述のように注入部７の容積
より、若干多目である。したがつて、注入部７が
充填された後にさらに、該注入部７内に注入され
る若干の過剰生地は、充填に伴う注入圧の上昇に
よつて、さらに生地逃げ注入部９ａ，９ｂに注入
され、これによつて注入圧は吸収される。 When forming the corner portion 1b, the fifth
As shown in the figure, the straight parts 1a, 1a formed in advance in the mold 8 are placed opposite each other, and unvulcanized rubber or ethylene vinyl acetate (E,
Inject a material such as hot melt resin such as V or A). The injection amount is slightly larger than the volume of the injection part 7 as described above. Therefore, after the injection part 7 is filled, some excess dough injected into the injection part 7 is further injected into the dough escape injection parts 9a and 9b due to the increase in injection pressure accompanying filling. This absorbs the injection pressure.
以上の工程によつて第３図に示したように押出
連続加硫成形法により成形された直状部１ａ，１
ａと、注入成形法によつて成形されたコーナー部
１ｂが一体となつたウエザーストリツプ１が完成
される。そしてこのウエザーストリツプ１の、直
状部１ａ，１ａのシールリツプ５と水切りリツプ
６のシール裏面５ｂ，６ｂには、前記の工程にお
いて、過剰生地が生地逃げ注入部９ａ，９ｂに注
入されたことによつて逃げ部１１が形成されるこ
ととなる。しかしながらこの逃げ部１１の成形位
置は、前記の如くシールリツプ５と水切りリツプ
６のシール裏面５ｂ，６ｂであつて、該シール裏
面５ｂ，６ｂは、シール表面５ａ，６ａの如くシ
ール機能を果す部分ではないことから、そのシー
ル特性に影響を与えるものではない。さらにシー
ル裏面５ｂ，６ｂは、ウエザーストリツプ１の取
り付け状態からすると、外方向からの視角に入る
位置ではないことから、外観上の不都合もない。
したがつて逃げ部１１は、切除することなく、そ
のままの着設状態を放置しても何らシール特性、
及び外観に影響を及ぼすことはない。 Through the above steps, the straight parts 1a, 1 are formed by the extrusion continuous vulcanization method as shown in FIG.
A weather strip 1 is completed in which the weather strip 1a and the corner portion 1b formed by the injection molding method are integrated. The seal lips 5 of the straight parts 1a, 1a and the seal back surfaces 5b, 6b of the draining lip 6 of this weather strip 1 have excess fabric injected into the fabric escape injection parts 9a, 9b in the above process. As a result, a relief portion 11 is formed. However, the molding position of this relief part 11 is the seal back surfaces 5b and 6b of the seal lip 5 and draining lip 6 as described above, and the seal back surfaces 5b and 6b are not the parts that perform the sealing function like the seal surfaces 5a and 6a. Since there is no such thing, it does not affect its sealing properties. Further, since the seal back surfaces 5b and 6b are not located at a position where the weather strip 1 is viewed from the outside, there is no problem in appearance.
Therefore, even if the relief part 11 is left as it is without being cut out, it will not have any sealing properties.
and has no effect on appearance.
以上説明したように本発明は、予め成形された
成形品の端部に、注入成形法により、注入部を一
体成形する方法において、前記成形品の外観及び
特性に影響を及ぼさない部位に、注入部成形生地
の逃げ部を形成するようにしたものであるから逃
げ部は、外観上及び当該成形品の特性上問題とな
ることはなく、したがつて逃げ部を切除する必要
はなく、当該作業工程の省略により、成形工程の
簡略化、延いては製造コストの低廉化が図れ、ま
たこれによつて成形された物に関しても、逃げ部
を切除することが不必要であることから、その切
除跡によつて外観や品質が低下することなく、良
好な外観、特性を持つた物を成形し得るものであ
る。逃げ部１１の長さαは、加剰注入量の多少に
よつて変動し、成形品ごとに不一致となるが、そ
の成形箇所が外観上、機能上の影響がない部分で
あるので特に前記不一致が問題となることもな
い。なお本発明の説明においては、自動車用のウ
エザーストリツプを例示したが、これに限るもの
ではなく、押出成形品等の端部もしくは接合部を
注入成形する場合においては、全て適用可能であ
る。 As explained above, the present invention provides a method for integrally molding an injection part on the end of a pre-formed molded article by injection molding, in which injection is carried out in a part that does not affect the appearance and characteristics of the molded article. Since the relief part is formed in the molded dough, the relief part does not pose a problem in terms of the appearance or the characteristics of the molded product, so there is no need to cut out the relief part, and the work By omitting the process, the molding process can be simplified and the manufacturing cost can be reduced, and since it is unnecessary to cut out the relief part of the product molded by this process, it is possible to simplify the molding process and reduce the manufacturing cost. It is possible to mold a product with good appearance and characteristics without degrading the appearance or quality due to marks. The length α of the relief portion 11 varies depending on the amount of excess injection, and will not match for each molded product, but since the molded part is a part that does not affect the appearance or function, the above-mentioned discrepancy is particularly important. is not a problem. In the description of the present invention, a weather strip for automobiles is illustrated, but the present invention is not limited to this, and can be applied to any case where the ends or joints of extrusion molded products are injection molded. .
第１図イは、従来方法によつて成形されたウエ
ザーストリツプを示す断面図、ロは同平面図、第
２図は第１図に示したウエザーストリツプの成形
に使用される金型断面図、第３図イは、本発明の
一実施例によつて成形されるウエザーストリツプ
の断面図、ロは同平面図、第４図は本発明の一実
施例に用いられる金型断面図、第５図はウエザー
ストリツプの嵌合状態を示す断面図である。
１……ウエザーストリツプ、１ａ……（ウエザ
ーストリツプの）直状部、１ｂ……（ウエザース
トリツプの）コーナー部、９ａ，９ｂ……生地逃
げ注入部、１１……逃げ部。
Figure 1A is a sectional view showing a weather strip formed by the conventional method, Figure 2 is a plan view of the same, and Figure 2 shows the metal used to mold the weather strip shown in Figure 1. 3A is a sectional view of a weather strip molded according to an embodiment of the present invention, B is a plan view of the same, and FIG. FIG. 5 is a cross-sectional view of the mold showing the fitted state of the weather strip. 1... Weather strip, 1a... Straight part (of the weather strip), 1b... Corner part (of the weather strip), 9a, 9b... Fabric relief injection part, 11... Relief part .
Claims (1)
法により、注入部を一体に成形する方法におい
て、前記成形品の外観及び特性に影響を及ぼさな
い部位に、注入部成形生地の逃げ部を形成するよ
うにしたことを特徴とする注入部形成方法。1. In a method of integrally molding an injection part on the edge of a pre-formed molded article by injection molding, the molded material for the injection part is placed in an area that does not affect the appearance and characteristics of the molded article. 1. A method for forming an injection part, the method comprising: forming an injection part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5213982A JPS58167113A (en) | 1982-03-30 | 1982-03-30 | Shaping method of pouring part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5213982A JPS58167113A (en) | 1982-03-30 | 1982-03-30 | Shaping method of pouring part |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58167113A JPS58167113A (en) | 1983-10-03 |
| JPH0316253B2 true JPH0316253B2 (en) | 1991-03-05 |
Family
ID=12906532
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5213982A Granted JPS58167113A (en) | 1982-03-30 | 1982-03-30 | Shaping method of pouring part |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58167113A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4619847A (en) * | 1984-03-20 | 1986-10-28 | The Standard Products Company | Trim strip having injection molded finishing portion and method of making |
| JPH0647360B2 (en) * | 1988-08-10 | 1994-06-22 | 豊田合成株式会社 | Weather strip |
-
1982
- 1982-03-30 JP JP5213982A patent/JPS58167113A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58167113A (en) | 1983-10-03 |
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