JP4074216B2 - Molding method for automotive sealing materials - Google Patents

Molding method for automotive sealing materials

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Publication number
JP4074216B2
JP4074216B2 JP2003111957A JP2003111957A JP4074216B2 JP 4074216 B2 JP4074216 B2 JP 4074216B2 JP 2003111957 A JP2003111957 A JP 2003111957A JP 2003111957 A JP2003111957 A JP 2003111957A JP 4074216 B2 JP4074216 B2 JP 4074216B2
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JP
Japan
Prior art keywords
molding
sealing material
curve
cooling chamber
mounting base
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 - Fee Related
Application number
JP2003111957A
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Japanese (ja)
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JP2004314448A (en
Inventor
保行 藤田
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.)
Nishikawa Rubber Co Ltd
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Nishikawa Rubber Co Ltd
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Filing date
Publication date
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Priority to JP2003111957A priority Critical patent/JP4074216B2/en
Publication of JP2004314448A publication Critical patent/JP2004314448A/en
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  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)

Description

【0001】
【発明の属する技術分野】
本発明は、熱可塑性樹脂製の取付基部と、軟質ゴム製のシール部とからなる自動車用シール材を成形する成形方法に関するものである。
【0002】
【従来の技術】
自動車用シール材(ウェザーストリップ)として、熱可塑性樹脂製の取付基部と、軟質ゴム製のシール部を一体成形したものが多く使用されている。このシール材は、直線部分を押出成形によって形成すると共に、コーナー部分を型成形によって形成するものと、全体を押出成形によって形成した後、コーナー部分を湾曲成形して形成するものとがある。
【0003】
そして、後者の成形方法の場合(全体を押出成形した後、コーナー部分を湾曲成形する場合)として、例えば特許文献1に記載のものがある。
【0004】
【特許文献1】
特開平5−57820号公報
【0005】
この特許文献1に記載の方法は、図7に示すように、押出成形機1によって連続的に押出成形した押出成形品10aを、加硫槽2で加硫した後、冷却槽8で冷却し、続いて裁断機4で一定長さに裁断した後、完全に冷える前に湾曲治具9で湾曲成形してシール材10としている。
【0006】
【発明が解決しようとする課題】
しかしながら、この従来の成形方法では、シール材10を裁断後に湾曲成形するため、それまで連続的に行われてきた成形工程が、この裁断によって途絶えてしまい、裁断から湾曲成形までの時間が個々のシール材10によって異なる結果となる。
従って、室温や湾曲治具9の温度の違いの影響から、各シール材10の熱履歴が異なり、よって、湾曲成形にバラツキが生じ、成形後の戻り量をコントロールすることが難しい。その結果、成形誤差が生じるといった問題が発生する。
【0007】
そこで、本発明の目的とするところは、湾曲成形にバラツキが発生ぜず、成形誤差の生じない自動車用シール材の成形方法を提供することにある。
【0008】
【課題を解決するための手段】
上記の目的を達成するために、本発明の請求項1に記載の自動車用シール材の成形方法は、熱可塑性樹脂製の取付基部(11)と軟質ゴム製のシール部(12)とからなるシール材(10)を成形する方法であって、押出成形機(1)によって連続的に押出成形した押出成形品(10a)を、加硫槽(2)によって加硫した後、湾曲成形装置(6,7)が内部に設けられ、湾曲成形に対応したカーブ状の形状をした冷却室(3)で冷却しながら湾曲成形し、その後、裁断機(4)で一定長さに裁断して前記シール材(10)としてなることを特徴とする。
【0009】
また、請求項2に記載の自動車用シール材の成形方法は、熱可塑性樹脂製の取付基部(11)と軟質ゴム製のシール部(12)とからなるシール材(10)を成形する方法であって、押出成形機(1)によって連続的に押出成形した押出成形品(10a)を、加硫槽(2)によって加硫した後、湾曲成形装置(6,7)が内部に設けられ、湾曲成形に対応したカーブ状の形状をした水槽の冷却室(3)で前記押出成形品(10a)を水で冷却しながら湾曲成形し、その後、裁断機(4)で一定長さに裁断して前記シール材(10)としてなることを特徴とする。
【0011】
またさらに、請求項3に記載の自動車用シール材の成形方法は、前記取付基部(11)の全体または一部に、くせ付けを容易にするための金属製の芯金(13)を埋設してなることを特徴とする。
【0012】
なお、カッコ内の記号は、図面および後述する発明の実施の形態に記載された対応要素または対応事項を示す。
【0013】
本発明の請求項1に記載のシール材の成形法によれば、押出成形機によって連続的に押出成形した押出成形品を、加硫槽によって加硫した後、冷却室で冷却しながら湾曲成形し、その後、裁断機で一定長さに裁断するので、湾曲成形にバラツキが発生しない。
【0014】
すなわち、押出成形品を、裁断する前に冷却室に送るので、連続的に湾曲成形することができる。従って、当該冷却室に送られる際の押出成形品の熱履歴を常に一定に保つことができるため、湾曲成形にバラツキが発生しない。
また、本発明によれば、前記冷却室を、湾曲成形に対応したカーブ状としているので、湾曲成形後の押出成形品の流れを円滑とし、また、当該冷却室の小型化を図ることができる。
【0015】
また、請求項2に記載の発明によれば、請求項1に記載の発明の作用効果に加えて、前記冷却室を水槽とし、前記押出成形品を水で冷却するので、短時間で冷却することができる。従って、成形時間の短縮を図ることができる。
【0017】
またさらに、請求項3に記載の発明によれば、請求項1又は2に記載の発明の作用効果に加えて、前記取付基部の全体または一部に、くせ付けを容易にするための金属製の芯金を埋設しているので、湾曲成形時におけるくせ付けを行い易くすると共に、湾曲成形後の戻りを小さくすることができる。また、押出成形品(シール材)の熱収縮や膨張を抑制することもできる。
従って、湾曲成形を容易かつ正確に行うことができる。
【0018】
【発明の実施の形態】
図1を参照して、本発明の実施形態に係る自動車用シール材の成形方法について説明する。図1は自動車用シール材の成形方法を示す工程図である。従来例で示したものと同一部分には同一符合を付した。
【0019】
本発明の実施形態に係る自動車用シール材の成形方法は、自動車のウエザーストリップとして使用するもので、断面略U字状で熱可塑性樹脂製の取付基部11と、中空状で軟質ゴム製のシール部12とからなるシール材10を成形するものである(図5および図6参照)。
【0020】
この成形方法は、まず、押出成形機1によって押出成形品10aを連続的に押出成形する。次に、当該押出成形品10aを、加硫槽2によって加硫する。続いて、湾曲成形装置が内部に設けられた冷却室3で冷却しながら部分的に湾曲成形してコーナー部を形成する。最後に、裁断機4で一定長さに裁断して完成品であるシール材10とする。
なお、冷却室3内における湾曲成形装置による湾曲成形は、金型6によって行うこともできるし(図2参照)、ローラー7によって行うこともできる(図3参照)。
【0021】
当該成形方法は、裁断前の押出成形品10aを連続的に冷却室3に送って湾曲成形を施すので、湾曲成形時における押出成形品10aの熱履歴を常に一定に保つことができる。
従って、湾曲成形にバラツキが発生せず、成形誤差が生じない。
【0022】
なお、押出成形品10aの冷却は、空冷で行うこともできるし、また、冷却室3を水槽として、この水槽で水冷することもできる。
水冷する場合は、短時間で冷却することができるので成形時間を短縮することができる。
【0024】
またさらに、請求項3に記載の発明によれば、請求項1又は2に記載の発明の作用効果に加えて、前記取付基部の全体または一部に、くせ付けを容易にするための金属製の芯金を埋設しているので、湾曲成形時におけるくせ付けを行い易くすると共に、湾曲成形後の戻りを小さくすることができる。また、押出成形品(シール材)の熱収縮や膨張を抑制することもできる。
従って、湾曲成形を容易かつ正確に行うことができる。
【0025】
【発明の効果】
本発明の請求項1に記載のシール材の成形法によれば、押出成形機によって連続的に押出成形した押出成形品を、加硫槽によって加硫した後、冷却室で冷却しながら湾曲成形し、その後、裁断機で一定長さに裁断するので、湾曲成形にバラツキが発生しない。
従って、成形誤差のないシール材を容易に成形することができる。
また、本発明によれば、前記冷却室を、湾曲成形に対応したカーブ状としているので、湾曲成形後の押出成形品の流れを円滑とし、当該冷却室の小型化を図ることができる。
これによっても、生産性の向上を図ることができる。
【0026】
また、請求項2に記載の発明によれば、請求項1に記載の発明の作用効果に加えて、前記冷却室を水槽とし、前記押出成形品を水で冷却するので、短時間で冷却することができ、成形時間の短縮を図ることができる。
これにより、生産性の向上を図ることができる。
【0027】
さらに、請求項3に記載の発明によれば、請求項1または2に記載の発明の作用効果に加えて、前記冷却室を、湾曲成形に対応したカーブ状としているので、湾曲成形後の押出成形品の流れを円滑とし、当該冷却室の小型化を図ることができる。
これによっても、生産性の向上を図ることができる。
【0028】
またさらに、請求項4に記載の発明によれば、請求項1乃至3に記載の発明の作用効果に加えて、前記取付基部の全体または一部に、くせ付けを容易にするための金属製の芯金を埋設しているので、湾曲成形時におけるくせ付けを行い易くすると共に、湾曲成形後の戻りを小さくすることができる。また、押出成形品(シール材)の熱収縮や膨張を抑制することもできる。
従って、湾曲成形を容易かつ正確に行うことができる。
【図面の簡単な説明】
【図1】本発明の実施形態に係る自動車用シール材の成形方法を示す工程図である。
【図2】図1に示す冷却室内部の他の実施形態を示す平面図である。
【図3】図1に示す冷却室内部のさらに他の実施形態を示す平面図である。
【図4】図1に示す冷却室のさらに他の実施形態を示す平面図である。
【図5】本発明方法によって成形される自動車用シール材を示す断面図である。
【図6】本発明方法によって成形される他の自動車用シール材を示す断面図である。
【図7】従来例に係る自動車用シール材の成形方法を示す工程図である。
【符号の説明】
1 押出成形機
2 加硫槽
3 冷却室
4 裁断機
6 金型
7 ローラー
8 冷却槽
9 湾曲治具
10 シール材
10a 押出成形品
11 取付基部
12 シール部
13 芯金
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a molding method for molding a sealing material for an automobile comprising an attachment base portion made of a thermoplastic resin and a seal portion made of a soft rubber.
[0002]
[Prior art]
As a sealing material (weather strip) for automobiles, a material in which a mounting base portion made of a thermoplastic resin and a sealing portion made of a soft rubber are integrally formed is often used. This sealing material includes a straight part formed by extrusion molding and a corner part formed by mold molding, and a seal part formed by extrusion molding and then curved forming the corner part.
[0003]
And as the case of the latter shaping | molding method (when extruding the whole and curving a corner part), there exists a thing of patent document 1, for example.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 5-57820
As shown in FIG. 7, the method disclosed in Patent Document 1 vulcanizes an extruded product 10 a continuously extruded by an extruder 1 in a vulcanizing tank 2 and then cools it in a cooling tank 8. Subsequently, after being cut into a certain length by the cutting machine 4, before being completely cooled, it is bent by a bending jig 9 to form a sealing material 10.
[0006]
[Problems to be solved by the invention]
However, in this conventional molding method, since the sealing material 10 is curved after cutting, the molding process that has been continuously performed is interrupted by this cutting, and the time from the cutting to the curved molding is individual. Different results are obtained depending on the sealing material 10.
Therefore, the thermal history of each sealing material 10 is different due to the influence of the temperature difference between the room temperature and the bending jig 9, and thus the curve forming varies and it is difficult to control the return amount after forming. As a result, there arises a problem that a molding error occurs.
[0007]
Accordingly, an object of the present invention is to provide a molding method of an automotive sealing material that does not cause variations in curve molding and does not cause molding errors.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a method for molding a sealing material for an automobile according to claim 1 of the present invention comprises a mounting base portion (11) made of a thermoplastic resin and a sealing portion (12) made of a soft rubber. A method of molding a sealing material (10), wherein an extruded product (10a) continuously extruded by an extruder (1) is vulcanized by a vulcanizing tank (2), and then a curved molding device ( 6 and 7) are provided in the inside, and are subjected to curve forming while being cooled in a cooling chamber (3) having a curved shape corresponding to the curve forming, and then cut to a predetermined length by a cutting machine (4). It becomes a sealing material (10), It is characterized by the above-mentioned.
[0009]
According to a second aspect of the present invention, there is provided a method for molding a sealing material for an automobile, wherein a sealing material (10) comprising a mounting base portion (11) made of thermoplastic resin and a sealing portion (12) made of soft rubber is molded. And after vulcanizing the extruded product (10a) continuously extruded by the extruder (1) by the vulcanizing tank (2), the bending device (6, 7) is provided inside, The extruded product (10a) is bent while being cooled with water in a cooling chamber (3) of a water tank having a curved shape corresponding to the bending, and then cut into a fixed length by a cutting machine (4). The sealing material (10) .
[0011]
Furthermore, in the method for molding an automobile sealing material according to claim 3 , a metal core bar (13) for facilitating the caulking is embedded in the whole or a part of the mounting base (11). It is characterized by.
[0012]
Symbols in parentheses indicate corresponding elements or corresponding matters described in the drawings and embodiments of the invention described later.
[0013]
According to the method for molding a sealing material according to claim 1 of the present invention, an extrusion-molded product continuously extruded by an extruder is vulcanized by a vulcanization tank and then bent while being cooled in a cooling chamber. Then, since it is cut into a certain length by a cutting machine, there is no variation in the curve forming.
[0014]
That is, since the extruded product is sent to the cooling chamber before cutting, it can be continuously curved. Therefore, since the heat history of the extrusion molded product when it is sent to the cooling chamber can always be kept constant, there is no variation in curve molding.
According to the present invention, since the cooling chamber has a curved shape corresponding to curve molding, the flow of the extruded product after curve molding can be made smooth, and the cooling chamber can be downsized. .
[0015]
According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, since the cooling chamber is a water tank and the extruded product is cooled with water, it is cooled in a short time. be able to. Therefore, the molding time can be shortened.
[0017]
Furthermore, according to the invention described in claim 3, in addition to the function and effect of the invention described in claim 1 or 2 , the whole or a part of the mounting base portion is made of a metal for facilitating the caulking. Since the cored bar is embedded, it is possible to facilitate the curling at the time of curve molding and to reduce the return after the curve molding. Moreover, the thermal contraction and expansion of the extrusion-molded product (sealing material) can also be suppressed.
Therefore, the curve forming can be performed easily and accurately.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
With reference to FIG. 1, the molding method of the sealing material for motor vehicles based on embodiment of this invention is demonstrated. FIG. 1 is a process diagram showing a method for molding an automobile sealing material. The same parts as those shown in the conventional example are denoted by the same reference numerals.
[0019]
A method for molding an automotive sealing material according to an embodiment of the present invention is used as a weather strip for an automobile. The mounting base 11 is made of a thermoplastic resin and has a substantially U-shaped cross section, and a hollow soft rubber seal. The sealing material 10 which consists of the part 12 is shape | molded (refer FIG. 5 and FIG. 6).
[0020]
In this molding method, first, the extruded product 10a is continuously extruded by the extruder 1. Next, the extruded product 10 a is vulcanized by the vulcanizing tank 2. Subsequently, the curve forming device is partially bent while being cooled in the cooling chamber 3 provided therein to form a corner portion. Finally, it is cut into a predetermined length by the cutting machine 4 to obtain a finished seal material 10.
In addition, the curve shaping | molding by the curve shaping apparatus in the cooling chamber 3 can also be performed with the metal mold | die 6 (refer FIG. 2), and can also be performed with the roller 7 (refer FIG. 3).
[0021]
In the molding method, since the extruded product 10a before cutting is continuously sent to the cooling chamber 3 to perform curve molding, the heat history of the extruded product 10a during curve molding can always be kept constant.
Therefore, there is no variation in curve forming and no forming error occurs.
[0022]
The extrusion molded product 10a can be cooled by air cooling, or can be cooled in this water tank by using the cooling chamber 3 as a water tank.
In the case of water cooling, the molding time can be shortened because it can be cooled in a short time.
[0024]
Furthermore, according to the invention described in claim 3, in addition to the function and effect of the invention described in claim 1 or 2 , the whole or a part of the mounting base portion is made of a metal for facilitating the caulking. Since the cored bar is embedded, it is possible to facilitate the curling at the time of curve molding and to reduce the return after the curve molding. Moreover, the thermal contraction and expansion of the extrusion-molded product (sealing material) can also be suppressed.
Therefore, the curve forming can be performed easily and accurately.
[0025]
【The invention's effect】
According to the method for molding a sealing material according to claim 1 of the present invention, an extrusion-molded product continuously extruded by an extruder is vulcanized by a vulcanization tank and then bent while being cooled in a cooling chamber. Then, since it is cut into a certain length by a cutting machine, there is no variation in the curve forming.
Accordingly, it is possible to easily form a sealing material without forming errors.
According to the present invention, since the cooling chamber has a curved shape corresponding to curve molding, the flow of the extruded product after curve molding can be made smooth, and the cooling chamber can be downsized.
Also by this, productivity can be improved.
[0026]
According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, since the cooling chamber is a water tank and the extruded product is cooled with water, it is cooled in a short time. And the molding time can be shortened.
Thereby, productivity can be improved.
[0027]
Further, according to the invention described in claim 3, in addition to the function and effect of the invention described in claim 1 or 2, since the cooling chamber has a curved shape corresponding to the curve forming, the extrusion after the curve forming is performed. The flow of the molded product can be made smooth, and the cooling chamber can be downsized.
Also by this, productivity can be improved.
[0028]
Furthermore, according to the invention described in claim 4, in addition to the function and effect of the invention described in claims 1 to 3, the whole or a part of the mounting base is made of a metal for facilitating the caulking. Since the cored bar is embedded, it is possible to facilitate the curling at the time of curve molding and to reduce the return after the curve molding. Moreover, the thermal contraction and expansion of the extrusion-molded product (sealing material) can also be suppressed.
Therefore, the curve forming can be performed easily and accurately.
[Brief description of the drawings]
FIG. 1 is a process diagram showing a method for molding a sealing material for automobiles according to an embodiment of the present invention.
FIG. 2 is a plan view showing another embodiment of the inside of the cooling chamber shown in FIG.
FIG. 3 is a plan view showing still another embodiment of the inside of the cooling chamber shown in FIG.
FIG. 4 is a plan view showing still another embodiment of the cooling chamber shown in FIG.
FIG. 5 is a cross-sectional view showing an automotive sealing material formed by the method of the present invention.
FIG. 6 is a cross-sectional view showing another automobile sealing material formed by the method of the present invention.
FIG. 7 is a process diagram showing a molding method of a sealing material for automobiles according to a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Extruder 2 Vulcanizing tank 3 Cooling chamber 4 Cutting machine 6 Mold 7 Roller 8 Cooling tank 9 Curving jig 10 Sealing material 10a Extrusion product 11 Mounting base 12 Sealing part 13 Core

Claims (3)

熱可塑性樹脂製の取付基部と軟質ゴム製のシール部とからなるシール材を成形する方法であって、
押出成形機によって連続的に押出成形した押出成形品を、加硫槽によって加硫した後、湾曲成形装置が内部に設けられ、湾曲成形に対応したカーブ状の形状をした冷却室で冷却しながら湾曲成形し、その後、裁断機で一定長さに裁断して前記シール材としてなることを特徴とする自動車用シール材の成形方法。
A method of molding a sealing material comprising a mounting base made of a thermoplastic resin and a sealing part made of soft rubber,
An extruded product that has been continuously extrusion-molded by an extruder is vulcanized by a vulcanizing tank, and then a curve-forming device is provided inside, while cooling in a cooling chamber having a curved shape corresponding to the curve-forming. A molding method for a sealing material for an automobile, which is formed into a curved shape and then cut into a predetermined length by a cutting machine to form the sealing material.
熱可塑性樹脂製の取付基部と軟質ゴム製のシール部とからなるシール材を成形する方法であって、
押出成形機によって連続的に押出成形した押出成形品を、加硫槽によって加硫した後、湾曲成形装置が内部に設けられ、湾曲成形に対応したカーブ状の形状をした水槽の冷却室で前記押出成形品を水で冷却しながら湾曲成形し、その後、裁断機で一定長さに裁断して前記シール材としてなることを特徴とする自動車用シール材の成形方法。
A method of molding a sealing material comprising a mounting base made of a thermoplastic resin and a sealing part made of soft rubber,
After the extrusion molded product continuously extruded by the extruder is vulcanized by the vulcanizing tank , the curve forming apparatus is provided inside, and the above-mentioned in the cooling chamber of the water tank having a curved shape corresponding to the curve forming A method for molding an automotive sealing material, wherein an extruded product is bent while being cooled with water, and then cut into a predetermined length by a cutting machine to form the sealing material.
前記取付基部の全体または一部に、くせ付けを容易にするための金属製の芯金を埋設してなることを特徴とする請求項1又は2に記載の自動車用シール材の成形方法。3. The method for molding a sealing material for an automobile according to claim 1, wherein a metal core bar for facilitating the soldering is embedded in the whole or a part of the mounting base portion.
JP2003111957A 2003-04-16 2003-04-16 Molding method for automotive sealing materials Expired - Fee Related JP4074216B2 (en)

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