JPH05154890A - Production of weather strip - Google Patents
Production of weather stripInfo
- Publication number
- JPH05154890A JPH05154890A JP3348993A JP34899391A JPH05154890A JP H05154890 A JPH05154890 A JP H05154890A JP 3348993 A JP3348993 A JP 3348993A JP 34899391 A JP34899391 A JP 34899391A JP H05154890 A JPH05154890 A JP H05154890A
- Authority
- JP
- Japan
- Prior art keywords
- opening
- back pressure
- shape
- product
- weather strip
- 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.)
- Pending
Links
Classifications
-
- B29C47/92—
Landscapes
- Vehicle Waterproofing, Decoration, And Sanitation Devices (AREA)
- Seal Device For Vehicle (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Molding Of Porous Articles (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は自動車用ウェザストリッ
プの製造方法、特に先端にシール部を有する形状のウェ
ザストリップでシール部に連続した部位の断面形状を連
続して変化させた自動車用ウェザストリップの製造方法
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a weatherstrip for an automobile, and more particularly to a weatherstrip having a shape having a seal portion at its tip, in which the cross-sectional shape of a portion continuous to the seal portion is continuously changed. The present invention relates to a manufacturing method of.
【０００２】[0002]
【従来の技術】従来、ウェザストリップの製造方法にお
いて、押出成形品の断面を途中で変化させる方法として
は、（１）押出しスクリュー回転数を変えることにより
押出し吐出量を変える方法（特開平３−１９２２号公
報）、（２）押出用口金に可動部を付属部品として設置
し、この可動部を動かすことにより口金出口の断面を変
化させる方法（特開昭５９−１１４０４０号公報）、
（３）押出用口金出口直後の押出成形体を第２の可動口
金を設けることにより製品形状と余肉とに分割する方法
（特開昭６１−２３０９３０号公報）、（４）口金出口
後、ナイフで連続的に部分切断させて変化させる方法な
どが知られている。2. Description of the Related Art Conventionally, in a method of manufacturing a weather strip, as a method of changing the cross section of an extruded product on the way, (1) a method of changing an extruding discharge amount by changing the number of revolutions of an extruding screw (JP-A-3- (1922), (2) a method in which a movable part is installed as an accessory in the extrusion die and the cross section of the die outlet is changed by moving the movable part (JP-A-59-114040).
(3) A method of dividing the extruded body immediately after the exit of the extrusion die into a product shape and a surplus by providing a second movable die (JP-A-61-230930), (4) After the exit of the die, A method is known in which a knife is used to partially cut it continuously to change it.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、前記
（１）の方法は押出し断面が相似形に変化するため部分
的な断面を変えることは困難である。また（２）の方法
は断面の一部を変化させることは可能であるが、口金出
口の断面積の変化がスクリューから押された押出機内の
背圧の変化に影響を与えて変化させる断面以外で変化さ
せたくない部位にダイスウエルの変化により所期の形状
が得られない難点がある。However, in the method (1), it is difficult to change a partial cross section because the extruded cross section changes to a similar shape. In the method (2), although it is possible to change a part of the cross section, other than the cross section in which the change of the cross-sectional area of the die outlet affects the change of the back pressure in the extruder pushed by the screw. There is a problem that the desired shape cannot be obtained due to the change of the die swell in the part that is not desired to change.
【０００４】更に（３）の方法は口金出口直後で押し出
されたタブを機械的に分割するため押出機内の圧力が分
割境界部に不均一に作用し、分割面がスムーズな表面を
形成せず、製品の商品価値を低下する懸念があると共
に、変化させる形状に制約があって特に先端シール部が
薄くなった形状のものや、先端シール部に中空部を有す
る形状のものは出来ず、利用分野が限定される問題があ
る。Further, the method (3) mechanically divides the tab extruded immediately after the outlet of the die, so that the pressure inside the extruder acts unevenly on the dividing boundary, and the dividing surface does not form a smooth surface. , There is a concern that the commercial value of the product will be reduced, and there is a restriction on the shape to be changed, especially the shape with a thin tip seal part or the shape with a hollow part in the tip seal part cannot be used. There is a problem that the field is limited.
【０００５】また（４）の方法は押出し後、製品の長さ
方向に伸張又は収縮する製品は断面積を常に一定に制御
できないため、所望する精度ある形状のものが得られな
い。特に芯金を有して押し出される製品で、長さ方向に
伸縮しない製品の製造に限定されると共に、切断に使用
されるナイフの摩耗、変形が予測され、メンテナンスに
も問題がある外、押出製品の断面で先端部分を変化させ
ることはできるが断面の中間部を変えることはできない
欠点があり、前述した各方法は何れも長さ方向に断面形
状が連続して変化するウェザストリップを広範囲に製造
する面ではなお、改善の余地を有していた。In the method (4), after extrusion, a product that expands or contracts in the longitudinal direction of the product cannot always be controlled to have a constant cross-sectional area. In particular, products that are extruded with a cored bar are limited to the manufacture of products that do not expand and contract in the length direction, and the knife used for cutting is expected to wear and deform, and there is also a problem in maintenance. There is a drawback that the tip part can be changed in the cross section of the product, but the middle part of the cross section can not be changed, and each of the above-mentioned methods has a wide range of weather strips in which the cross sectional shape continuously changes in the longitudinal direction. In terms of manufacturing, there was still room for improvement.
【０００６】そこで本出願人は上述の如き実状に対処
し、特にスクリューから押し出されて来た押出機内の背
圧に着目し、粘稠性エラストマー材料が押出用口金に出
る前に製品側開孔部と背圧調整用開孔部に分け、背圧を
適切に配分することを見出し、先端にシール部を有する
形状のもので先端シール部の形状が薄いシールリップ、
折り曲げたシールリップ、中空部を有するシールリップ
などの種々の形状をもち、しかもシール部に連続した部
位の長さを一定の幅で変化させたウェザストリップを得
る方法をさきに提案した。Therefore, the present applicant has dealt with the above-mentioned situation, paying particular attention to the back pressure in the extruder extruded from the screw, and open the product side before the viscous elastomer material comes out to the extrusion die. Section and a back pressure adjusting hole, and found that the back pressure is properly distributed, and a seal lip at the tip with a thin tip sealing section,
A method for obtaining a weather strip having various shapes such as a bent seal lip and a seal lip having a hollow portion, and having the length of a portion continuous to the seal portion changed by a constant width was previously proposed.
【０００７】本発明は更に上記方法を発展させ、上記方
法が背圧を製品開孔部と背圧調整用開孔部に適切に配分
するのに対し、製品断面形状変化に伴う背圧変化を背圧
調整用開孔を用いて一定に保持せしめることにより変化
部のゴムの押出量を調整し、該変化部以外の製品形状を
安定化して変化部の形状に制約されないウェザストリッ
プを精度よく得ることを目的とするものである。The present invention further develops the above method, in which the back pressure is appropriately distributed to the product opening and the back pressure adjusting opening, while the back pressure change due to the change of the product cross-sectional shape is changed. By adjusting the amount of rubber extruded at the changing portion by holding it constant using the back pressure adjusting holes, the product shape other than the changing portion is stabilized and a weather strip that is not restricted by the shape of the changing portion can be obtained accurately. The purpose is that.
【０００８】[0008]
【課題を解決するための手段】即ち、上記目的に適合す
る本発明の特徴は、長さ方向で押出断面形状が連続して
変化するウェザストリップの製造方法において、押出機
先端の押出用口金の製品開孔を通じて成形体を押出すに
あたり、ウェザストリップの断面形状変化に伴う背圧変
化を、前記製品開孔と離れて背圧調整用開孔を設け、該
背圧調整用開孔の形状および開孔面積を製品開孔の変化
部と同形、同面積となし、互いに連動させ、同量逆変化
せしめることにある。Means for Solving the Problems That is, the feature of the present invention which meets the above object is that in a method for producing a weather strip in which the extrusion cross-sectional shape continuously changes in the length direction, the extrusion die at the tip of the extruder is In extruding the molded body through the product opening, the back pressure change due to the change in the cross-sectional shape of the weather strip is provided with a back pressure adjusting opening apart from the product opening, and the shape of the back pressure adjusting opening and The opening area is made to have the same shape and area as the changed portion of the product opening, and they are interlocked with each other to change the same amount in the opposite direction.
【０００９】[0009]
【作用】本発明方法は押出機先端に製品開孔と背圧調整
用開孔を設け、それら背圧調整用開孔の形状および開孔
面積を製品開孔の変化部と同形，同面積とし、互いに連
動させ、一方は減の方向に、他方は増の方向に同量逆変
化せしめてウェザストリップの断面形状変化に伴う背圧
変化を一定に保持せしめるため、２つの開孔の面積変化
は変位に対して逆比例関係で増減し製品断面の過剰とな
った分と同量のエラストマー材を背圧調整用開孔より排
出し、長さ方向に押出断面が連続するウェザストリップ
でも、その変形部形状に制約されず、意図通りの形状で
製造することができる。In the method of the present invention, the product opening and the back pressure adjusting opening are provided at the tip of the extruder, and the shape and the opening area of the back pressure adjusting opening are made the same shape and the same area as the changing portion of the product opening. , The interlocking movements of the two holes are changed in the same direction in the decreasing direction and the increasing direction in the other direction to keep the back pressure change due to the change of the cross-sectional shape of the weather strip constant. Even if the weatherstrip has a continuous extrusion cross section in the longitudinal direction, the same amount of elastomer material as the excess of the product cross section that increases and decreases in inverse proportion to the displacement is discharged from the back pressure adjustment opening It is possible to manufacture in an intended shape without being restricted by the shape of the part.
【００１０】[0010]
【実施例】以下、更に添付図面を参照し、本発明の具体
的実施例を説明する。図１ないし図３は本発明方法を実
施する装置、特にその要部をなす押出機先端の押出用口
金部の１例であり、図において、該口金部は所定の断面
形状のウェザストリップを成形するべく所定の断面積の
製品開孔（１ａ），（１ｂ），（１ｃ）をもつ口金板
（１）と、該口金板（１）の押出側前面に摺動可能に配
設された摺動部材（３）を有して形成されていて、その
表面に表面板（４）が被着されて一体のものとなってい
る。そして上記摺動部材（３）には、製品開孔（１
ａ），（１ｂ），（１ｃ）と離れて、図では上方位置に
背圧調整用開孔（２）が口金板（１）の開孔と連通して
穿設されており、表面板（４）には背圧調整用開孔
（２）より吐出されたエラストマー材を吐出する窓孔
（５）が設けられている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 3 show an example of an apparatus for carrying out the method of the present invention, in particular, an extrusion die portion at the tip of an extruder which is the main part of the apparatus. In the drawings, the die portion forms a weatherstrip having a predetermined cross-sectional shape. A die plate (1) having product openings (1a), (1b), (1c) with a predetermined cross-sectional area, and a slide slidably arranged on the front surface of the die plate (1) on the extrusion side. The moving member (3) is formed, and the surface plate (4) is attached to the surface of the moving member (3) to form an integral body. The sliding member (3) has a product opening (1
a), (1b) and (1c) apart from each other, a back pressure adjusting opening (2) is provided at an upper position in the figure so as to communicate with the opening of the base plate (1), and the surface plate ( 4) is provided with a window hole (5) for discharging the elastomer material discharged from the back pressure adjusting opening (2).
【００１１】背圧調整用開孔（２）は製品開孔のうち製
品断面形状が変形する部位、即ち、変化部の開孔（１
ｃ）と同形状，同面積であり、製品の押出断面形状の変
化に伴い、両孔（１ｃ），（２）よりのゴム吐出量を調
整し、背圧を一定に制御している。The back pressure adjusting opening (2) is a portion of the product opening where the product cross-sectional shape is deformed, that is, an opening (1) at the changing portion.
The shape and area are the same as those in c), and the amount of rubber discharged from both holes (1c) and (2) is adjusted according to the change in the extrusion cross-sectional shape of the product, and the back pressure is controlled to be constant.
【００１２】そして調整開孔の変化部開孔（１ｃ）と摺
動部材（３）の背圧調整用開孔（２）は連動して同時
に、一方が減ずるときは他方が増加する、即ち、２つの
開孔面積の変化量は変位に対して負の比例関係となって
いる。Then, the changing portion opening (1c) of the adjustment opening and the back pressure adjusting opening (2) of the sliding member (3) are interlocked simultaneously, and when one decreases, the other increases, that is, The change amount of the two opening areas has a negative proportional relationship with the displacement.
【００１３】図１〜図３に示す押出用口金部は２つの製
品開孔（１ａ），（１ｂ），（１ｃ）と背圧調整用開孔
（２）の可動部は１つの摺動部材（３）として一体化さ
れており、摺動部材（３）の摺動によって両開孔の変化
が連動するが、この可動部は一体でなく、別々に形成し
既知の手段を使用して連動せしめるようにしても差し支
えない。図１〜図３は上記押出用口金を用い、成形する
ときの状態を示し通常の押出時においては背圧調整用開
孔（２）は閉状態（図１参照）であるが、摺動部材
（３）を変化量ａだけ移動させた状態では製品断面は変
化量ａだけ縮められ、これによって過剰となったエラス
トマー材と同量のエラストマー材（ゴム）を背圧調整用
開孔（２）より排出し、背圧を一定に保ち、任意の部位
以外の形状を安定化する。（図２参照） また、背圧調整用開孔（２）が全開状態では、これに対
応して製品の断面形状は同量分だけ変化し、過剰となっ
たエラストマー材が全開状態の背圧調整用開孔（２）よ
り排出される。なお、上記図１〜図３にあっては変化部
（１ｃ）の形状が変位方向に対して不均一であるが、勿
論、変化部（１ｃ）形状は均一形状であってもよく、何
れにしても、特に変化部の形状に制約されることはな
く、本発明方法は適用される。The extrusion die shown in FIGS. 1 to 3 has two product openings (1a), (1b), (1c) and a back pressure adjusting opening (2). It is integrated as (3), and the change of both apertures is interlocked by the sliding of the sliding member (3), but this movable part is not integrated, but is formed separately and interlocked using known means. It doesn't matter if you try to do it. 1 to 3 show a state when molding is performed using the above extrusion die, and the back pressure adjusting opening (2) is in a closed state (see FIG. 1) during normal extrusion. In the state where (3) is moved by the change amount a, the product cross section is contracted by the change amount a, and the same amount of elastomer material (rubber) as the excess elastomer material is opened by the back pressure adjusting opening (2). Discharge more, keep the back pressure constant, and stabilize the shape other than arbitrary parts. (See Fig. 2) Also, when the back pressure adjusting hole (2) is fully opened, the cross-sectional shape of the product changes by the same amount correspondingly, and the excess elastomer material is fully opened. It is discharged from the adjustment hole (2). Although the shape of the changing portion (1c) is not uniform in the displacement direction in FIGS. 1 to 3, of course, the changing portion (1c) may have a uniform shape. However, the method of the present invention is applicable without being restricted by the shape of the changed portion.
【００１４】かくして、本発明方法により自動車用ウェ
ザストリップは既知の如く、一方の押出材よりソリッド
のエラストマー材（ゴム）を送出し、他方の押出機より
発泡性エラストマー材（ゴム）を送出し、シール部は発
泡性エラストマーにより成形し、これに連続する取付部
はソリッドエラストマーにより成形して長さ方向に連続
して押し出されつつ、途中で断面形状が変化するウェザ
ストリップを製造することができる。Thus, according to the method of the present invention, a weather strip for automobiles, as is known, delivers a solid elastomer material (rubber) from one extruded material and a foamable elastomer material (rubber) from the other extruder, The seal portion is formed of a foamable elastomer, and the attachment portion that is continuous with the seal portion is formed of solid elastomer, and a weather strip having a cross-sectional shape that changes while being extruded continuously in the length direction can be manufactured.
【００１５】[0015]
【発明の効果】本発明は以上のように押出機先端の押出
用口金の製品開孔を通じて成形体を押出すにあたり、ウ
ェザストリップの断面形状変化に伴う背圧変化を、前記
製品開孔と離れて設けた背圧調整用開孔を用い、該背圧
調整用開孔の形状および開孔面積を製品開孔の変化部と
同形、同面積となし、互いに連動させ、同量逆変化せし
めることにより一定に保持せしめてウェザストリップを
製造する方法であり、製品開孔部への吐出条件を一定と
したとき、断面形状の変化と同時に背圧の変化を招き、
不意の形状変化を惹起する原因となるが、本発明方法は
背圧調整用開孔を設け、該開孔の形状，面積を製品断面
の変化部の形状，面積と同様として両者連動させて同時
に同量の変化をさせるため、長さ方向で断面形状に連続
して変化のあるウェザストリップに対しても変化させる
形状に制約されず、精度よく、意図通りの形状を得るこ
とができる顕著な効果を有する。As described above, according to the present invention, when a molded product is extruded through the product hole of the extrusion die at the tip of the extruder, the back pressure change caused by the change in the cross-sectional shape of the weather strip is separated from the product hole. Using the back pressure adjustment opening provided in the above, the shape and the opening area of the back pressure adjustment opening are the same shape and the same area as the changed portion of the product opening, and they can be interlocked with each other and changed in the same amount and inversely. It is a method of manufacturing a weather strip by keeping it constant by means of, and when the discharge condition to the product aperture is constant, it causes a change in cross-sectional shape and a change in back pressure at the same time.
Although it causes an unexpected shape change, the method of the present invention is provided with a back pressure adjusting hole, and the shape and area of the hole are made to be the same as the shape and area of the changed portion of the product cross section and both are simultaneously operated at the same time. Since the same amount of change is applied, it is possible to obtain the desired shape with high accuracy, without being restricted by the shape that changes even for weather strips that continuously change in the cross-sectional shape in the length direction. Have.
【図１】背圧調整用開孔が閉状態にあるときの押出用口
金部の正面図である。FIG. 1 is a front view of an extrusion die part when a back pressure adjusting hole is in a closed state.
【図２】背圧調整用開孔が半閉状態にあるときの押出用
口金部の正面図である。FIG. 2 is a front view of an extrusion die part when a back pressure adjusting hole is in a semi-closed state.
【図３】背圧調整用開孔が全開状態にあるときの押出用
口金部の正面図である。FIG. 3 is a front view of the extrusion die part when the back pressure adjusting hole is in a fully opened state.
（１） 口金板 （１ａ）（１ｂ）製品開孔 （１ｃ） 製品開孔の変化部開孔 （２） 背圧調整用開孔 （３） 摺動部材 （４） 表面板 （５） 窓孔 (1) Die plate (1a) (1b) Product hole (1c) Product hole changed part hole (2) Back pressure adjustment hole (3) Sliding member (4) Surface plate (5) Window hole
Claims (1)
するウェザストリップの製造方法において、押出機先端
の押出用口金の製品開孔を通じて成形体を押出すにあた
り、ウェザストリップの断面形状変化に伴う背圧変化
を、前記製品開孔と離れて背圧調整用開孔を設け、該背
圧調整用開孔の形状および開孔面積を製品開孔の変化部
と同形、同面積となし、互いに連動させ、同量逆変化せ
しめることにより一定に保持せしめることを特徴とする
ウェザストリップの製造方法。1. A method for producing a weather strip in which the extrusion cross-sectional shape continuously changes in the length direction, in which the cross-sectional shape of the weather strip changes when the molded body is extruded through a product opening of the extrusion die at the tip of the extruder. With respect to the back pressure change caused by the above, a back pressure adjusting opening is provided separately from the product opening, and the shape and the opening area of the back pressure adjusting opening are the same as the changed portion of the product opening and are not the same area. , A method for manufacturing a weather strip, characterized in that they are kept constant by interlocking with each other and changing the amounts by the same amount.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3348993A JPH05154890A (en) | 1991-12-05 | 1991-12-05 | Production of weather strip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3348993A JPH05154890A (en) | 1991-12-05 | 1991-12-05 | Production of weather strip |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05154890A true JPH05154890A (en) | 1993-06-22 |
Family
ID=18400772
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3348993A Pending JPH05154890A (en) | 1991-12-05 | 1991-12-05 | Production of weather strip |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05154890A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0740411A (en) * | 1993-06-29 | 1995-02-10 | Katayama Kogyo Kk | Method and apparatus for producing molding |
| US5567368A (en) * | 1993-08-31 | 1996-10-22 | Tokai Kogyo Kabushiki Kaisha | Extrusion molding method and extrusion molding apparatus |
| US5656223A (en) * | 1991-07-25 | 1997-08-12 | Tokai Kogyo Kabushiki Kaisha | Windshield molding for vehicles and the production method thereof |
| US5679303A (en) * | 1994-09-22 | 1997-10-21 | Toyoda Gosei Co., Ltd. | Method of and an apparatus for forming weather strip by extrusion |
| US5795597A (en) * | 1991-05-31 | 1998-08-18 | Tokai Kogyo Kabushiki Kaisha | Windshield molding for vehicles |
| US6196615B1 (en) | 1990-10-23 | 2001-03-06 | Tokai Kogyo Kabushiki Kaisha | Automobile windshield molding and the method of producing the same |
-
1991
- 1991-12-05 JP JP3348993A patent/JPH05154890A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6196615B1 (en) | 1990-10-23 | 2001-03-06 | Tokai Kogyo Kabushiki Kaisha | Automobile windshield molding and the method of producing the same |
| US5795597A (en) * | 1991-05-31 | 1998-08-18 | Tokai Kogyo Kabushiki Kaisha | Windshield molding for vehicles |
| US5656223A (en) * | 1991-07-25 | 1997-08-12 | Tokai Kogyo Kabushiki Kaisha | Windshield molding for vehicles and the production method thereof |
| US5718470A (en) * | 1991-07-25 | 1998-02-17 | Tokai Kogyo Kabushiki Kaisha | Windshield molding for vehicles and the production method thereof |
| JPH0740411A (en) * | 1993-06-29 | 1995-02-10 | Katayama Kogyo Kk | Method and apparatus for producing molding |
| JPH07119048B2 (en) * | 1993-06-29 | 1995-12-20 | 片山工業株式会社 | Molding manufacturing method and apparatus |
| US5567368A (en) * | 1993-08-31 | 1996-10-22 | Tokai Kogyo Kabushiki Kaisha | Extrusion molding method and extrusion molding apparatus |
| US5679303A (en) * | 1994-09-22 | 1997-10-21 | Toyoda Gosei Co., Ltd. | Method of and an apparatus for forming weather strip by extrusion |
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