JP3043555B2 - Extruded product manufacturing method - Google Patents
Extruded product manufacturing methodInfo
- Publication number
- JP3043555B2 JP3043555B2 JP5267335A JP26733593A JP3043555B2 JP 3043555 B2 JP3043555 B2 JP 3043555B2 JP 5267335 A JP5267335 A JP 5267335A JP 26733593 A JP26733593 A JP 26733593A JP 3043555 B2 JP3043555 B2 JP 3043555B2
- Authority
- JP
- Japan
- Prior art keywords
- soft
- synthetic resin
- hard
- resin portion
- extruded
- 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 - Lifetime
Links
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- Extrusion Moulding Of Plastics Or The Like (AREA)
Description
【0001】[0001]
【産業上の利用分野】この発明は軟質合成樹脂部と硬質
合成樹脂部とを長手方向に交互に連続して有する押出成
形品の製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an extruded product having a soft synthetic resin portion and a hard synthetic resin portion alternately and continuously in a longitudinal direction.
【0002】[0002]
【従来の技術】車両用ウインドモールディングやウエザ
ストリップのような押出成形品において、例えば特開平
5−85162号公報に開示されたもののように、コー
ナ部を軟質にして曲げ性を向上させ、直線部を硬質にし
て剛性を高めたものが知られている。また、長手方向に
可変する硬度を有した押出成形品として、例えば特開昭
63−286321号公報に開示されたものが知られて
いる。2. Description of the Related Art In an extruded product such as a vehicle window molding or a weather strip, for example, as disclosed in Japanese Patent Application Laid-Open No. 5-85162, a corner portion is made soft to improve bendability and a straight line is formed. There is known a structure in which a portion is hardened to increase rigidity. Further, as an extruded product having a hardness that can be varied in the longitudinal direction, for example, an extruded product disclosed in JP-A-63-286321 is known.
【0003】[0003]
【発明が解決しようとする課題】ところで、硬度が異な
る二種類の熱可塑性合成樹脂よりなる軟質材料と、硬質
材料とを押出成形用ダイの成形路に交互に給送してこれ
ら軟質材料と硬質材料とを前記成形路出口の押出口から
連続して押出す際、前記軟質材料と硬質材料との切り替
え時において、これら材料の流れが不安定となる。すな
わち、熱可塑性樹脂材料は、軟質材料と硬質材料との溶
融温度の全域にわたって粘度差が大きい。例えば、軟質
材料が汎用の軟質PVCであり、硬質材料が汎用の硬質
PVCである場合、図6に示すように、これら各材料は
温度(℃)の変化にほとんどかかわることなく、その粘
度(104 POISE)の差が著しく大きい。そして、
前記粘度差が原因となって軟質材料と硬質材料との切り
替え時に材料の流れが不安定となり、その押出成形品に
おける軟質合成樹脂部と硬質合成樹脂部との境界部近傍
に凹凸の歪みが生じ、見栄えが悪化されるという問題点
があった。By the way, a soft material made of two kinds of thermoplastic synthetic resins having different hardnesses and a hard material are alternately fed to a molding path of an extrusion die so that the soft material and the hard material are hardened. When the material is continuously extruded from the extrusion port at the exit of the forming path, the flow of these materials becomes unstable when switching between the soft material and the hard material. That is, the thermoplastic resin material has a large viscosity difference over the entire melting temperature range of the soft material and the hard material. For example, when the soft material is a general-purpose soft PVC and the hard material is a general-purpose hard PVC, as shown in FIG. 6, each of these materials has a viscosity (10.degree. 4 POISE) is remarkably large. And
Due to the difference in viscosity, the flow of the material becomes unstable when switching between the soft material and the hard material, and distortion of unevenness occurs near the boundary between the soft synthetic resin portion and the hard synthetic resin portion in the extruded product. However, there is a problem that appearance is deteriorated.
【0004】この発明の目的は、前記した従来の問題点
に鑑み、熱可塑性合成樹脂よりなる軟質材料と硬質材料
との切り替え時における材料流れを安定化して凹凸の歪
みを軽減することができる押出成形品の製造方法を提供
することである。SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, it is an object of the present invention to stabilize a material flow at the time of switching between a soft material and a hard material made of a thermoplastic synthetic resin and reduce distortion of unevenness. An object of the present invention is to provide a method for producing a molded article.
【0005】[0005]
【課題を解決するための手段】前記目的を達成するため
に、この発明は、軟質合成樹脂部と硬質合成樹脂部とを
長手方向に交互に連続して有する押出成形品の製造方法
であって、温度に対する粘度の曲線が特定の温度範囲に
おいて交差又は近接する特性を有する軟質熱可塑性合成
樹脂よりなる軟質材料と、硬質熱可塑性合成樹脂よりな
る硬質材料とを選定し、押出成形用ダイの前面に開口す
る押出口をもつ成形路に対し、前記軟質材料と硬質材料
とを交互に給送し、これら軟質材料と硬質材料とを前記
特定の温度範囲に保ちながら前記押出口から順次に連続
して押出すことで、軟質合成樹脂部と硬質合成樹脂部と
を長手方向に交互に連続して有する押出成形品を製造す
る。In order to achieve the above object, the present invention provides a method for producing an extruded product having a soft synthetic resin portion and a hard synthetic resin portion alternately and continuously in a longitudinal direction. A soft material made of a soft thermoplastic synthetic resin having a characteristic that a curve of viscosity with respect to temperature crosses or approaches in a specific temperature range, and a hard material made of a hard thermoplastic synthetic resin are selected, and a front surface of an extrusion die is selected. The soft material and the hard material are alternately fed to a molding path having an extrusion port that opens at the opening, and the soft material and the hard material are sequentially and continuously fed from the extrusion port while maintaining the soft material and the hard material in the specific temperature range. Extruded to produce an extruded product having a soft synthetic resin portion and a hard synthetic resin portion alternately and continuously in the longitudinal direction.
【0006】[0006]
【作用】前記したように構成される押出成形品の製造方
法において、温度に対する粘度の曲線が特定の温度範囲
において交差又は近接する特性を有する軟質熱可塑性合
成樹脂よりなる軟質材料と、硬質熱可塑性合成樹脂より
なる硬質材料とを押出成形用ダイの成形路に交互に給送
し、これら軟質材料と硬質材料とを前記特定の温度範囲
に保ことで、軟質材料と硬質材料との切り替え時に材料
の流れが乱れることなく安定化する。In the method for manufacturing an extruded product constituted as described above, a soft material made of a soft thermoplastic synthetic resin having a characteristic that a curve of viscosity with respect to temperature crosses or approaches in a specific temperature range; A hard material made of a synthetic resin is alternately fed to a molding path of an extrusion die, and the soft material and the hard material are kept in the specific temperature range, so that the material is switched when the soft material and the hard material are switched. The flow is stabilized without being disturbed.
【0007】[0007]
【実施例】以下、この発明の一実施例を図1〜図5にし
たがって説明する。押出成形用ダイを断面で表わした図
1と図2において、ダイ1には第1材料流路2と第2材
料流路3とがそれぞれ形成されており、これら第1、第
2の両材料通路2,3はダイ1の中央部に形成された弁
室4に合流している。また、ダイ1には前記弁室4に通
じる成形路5と、排出路7とがそれぞれ形成されてお
り、該成形路5はダイ1の前端(図1では上端)に開口
し、その開口部を押出口6としている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. 1 and 2, which show a cross section of an extrusion molding die, a die 1 is formed with a first material flow path 2 and a second material flow path 3, respectively. The passages 2 and 3 join a valve chamber 4 formed at the center of the die 1. A forming path 5 and a discharge path 7 are formed in the die 1 and communicate with the valve chamber 4. The forming path 5 opens at the front end (the upper end in FIG. 1) of the die 1. Is the extrusion port 6.
【0008】前記弁室4には、第1、第2の両材料流路
2,3を成形路5と排出路7とにそれぞれ切替え連通す
るためのロータリ式の切替え弁8が組付けられている。
そして、図1に示すように、切替え弁8が第1切替え位
置に配置されたときには、第1材料流路2が弁室4を通
して成形路5に連通され、第2材料流路3が弁室4を通
して排出路7に連通される。The valve chamber 4 is provided with a rotary switching valve 8 for switching the first and second material flow paths 2 and 3 to the forming path 5 and the discharge path 7, respectively. I have.
Then, as shown in FIG. 1, when the switching valve 8 is disposed at the first switching position, the first material flow path 2 is communicated with the molding path 5 through the valve chamber 4, and the second material flow path 3 is connected to the valve chamber. 4 and communicate with the discharge path 7.
【0009】さらに、図2に示すように、切替え弁8が
第2切替え位置に配置されたときには、第2材料流路3
が弁室4を通して成形路5に連通され、第1材料流路2
が弁室4を通して排出路7に連通されるようになってい
る。前記第1材料流路2は第1押出機(図示はしない)
に接続され、該第1押出機から軟質熱可塑性合成樹脂よ
りなる軟質材料P1が前記第1材料流路2に給送され
る。また、前記第2材料流路3は第2押出機(図示しな
い)に接続され、該第2押出機から硬質熱可塑性合成樹
脂よりなる硬質材料P2が前記第2材料流路3に給送さ
れる。Further, as shown in FIG. 2, when the switching valve 8 is located at the second switching position, the second material flow path 3
Is communicated with the forming path 5 through the valve chamber 4 and the first material flow path 2
Is connected to the discharge passage 7 through the valve chamber 4. The first material flow path 2 is a first extruder (not shown)
And a soft material P1 made of a soft thermoplastic synthetic resin is fed from the first extruder to the first material flow path 2. The second material flow path 3 is connected to a second extruder (not shown), and a hard material P2 made of a hard thermoplastic synthetic resin is fed from the second extruder to the second material flow path 3. You.
【0010】前記軟質材料P1と硬質材料P2との選定
条件として、相溶性を有し、かつ温度に対する粘度の曲
線が特定の温度範囲において交差又は近接(好ましくは
交差)する特性を有するもののうちから適宜に選定され
る。この実施例において、軟質材料P1にはJISのA
硬度において70度の硬度をもつ汎用の軟質PVC(塩
化ビニル樹脂)が用いられる。PVCは非結晶性樹脂で
あり、図5の実線に示すように、温度に対する粘度の変
化は比較的小さい。これに対し、硬質材料P2には、J
ISのA硬度において90度の硬度を有し、しかも図5
の1点鎖線に示すように温度が上昇すると粘度が著しく
低下しかつ前記軟質材料P1の特性曲線に対し162℃
前後で交差する特性曲線をもつ硬質材料が用いられる。[0010] The soft material P1 and the hard material P2 are selected from those having compatibility and having a characteristic that a curve of viscosity with respect to temperature crosses or approaches (preferably crosses) in a specific temperature range. It is selected appropriately. In this embodiment, the soft material P1 is JIS A
General-purpose soft PVC (vinyl chloride resin) having a hardness of 70 degrees is used. PVC is a non-crystalline resin, and the change in viscosity with temperature is relatively small, as shown by the solid line in FIG. In contrast, the hard material P2 has J
It has a hardness of 90 degrees in A hardness of IS, and FIG.
As shown by the one-dot chain line, when the temperature rises, the viscosity drops significantly and the characteristic curve of the
A hard material having a characteristic curve intersecting before and after is used.
【0011】例えば、硬質PVCに対しポリエステル樹
脂のような結晶性樹脂を所要の割合で混合することで、
温度に対する粘度の変化を著しく大きくしたものや、あ
るいは、ポリエチレンPVCコポリマのようなPVCに
α−オレフィンを共重合したものが硬質材料P2として
用いられる。For example, by mixing a crystalline resin such as a polyester resin in a required ratio with rigid PVC,
As the hard material P2, a material having a significantly large change in viscosity with respect to temperature, or a material obtained by copolymerizing an α-olefin with PVC such as a polyethylene PVC copolymer is used.
【0012】前記した条件のもとで選定された軟質材料
P1と硬質材料P2とがダイ1に給送される押出成形時
には、前記ダイ1が160℃〜170℃、好ましくは軟
質材料P1と硬質材料P2との特性曲線が交差する16
2℃程度の温度に加熱され、その温度に保持される。そ
して、図1に示すように、切替え弁8が第1位置に配置
された状態において、第1材料流路2の軟質材料P1が
弁室4を通して成形路5に流れ、その軟質材料P1が成
形路5の押出口6から押出されることで、図3に示すよ
うな所要の断面形状をもつ軟質合成樹脂部12が形成さ
れる。At the time of extrusion molding in which the soft material P1 and the hard material P2 selected under the above-described conditions are fed to the die 1, the die 1 is heated to 160 to 170 ° C., preferably, the soft material P1 and the hard material P1. The characteristic curve with the material P2 crosses 16
It is heated to a temperature of about 2 ° C. and kept at that temperature. Then, as shown in FIG. 1, in a state where the switching valve 8 is disposed at the first position, the soft material P1 of the first material flow path 2 flows into the forming path 5 through the valve chamber 4, and the soft material P1 is formed. By being extruded from the extrusion port 6 of the path 5, a soft synthetic resin portion 12 having a required cross-sectional shape as shown in FIG. 3 is formed.
【0013】軟質材料P1が所要量給送されたところ
で、図2に示すように切替え弁8が第2位置に切替え配
置される。すると、第2材料流路P2の硬質材料P2が
弁室4を通して成形路5に流れ、その硬質材料P2が成
形路5の押出口6から押出されることで、前記軟質合成
樹脂部12と一体に連続する硬質合成樹脂部13が形成
される。When the required amount of the soft material P1 has been fed, the switching valve 8 is switched to the second position as shown in FIG. Then, the hard material P2 of the second material flow path P2 flows into the molding path 5 through the valve chamber 4, and the hard material P2 is extruded from the extrusion port 6 of the molding path 5 to be integrated with the soft synthetic resin portion 12. The hard synthetic resin portion 13 which is continuous with the above is formed.
【0014】前記したように、切替え弁8が第1位置と
第2位置とに繰り返して配置切替えされることで、軟質
合成樹脂部12と硬質合成樹脂部13とを長手方向に交
互に連続して有する長尺体が形成され、これが所要長さ
に切断されることで、図4に示すような押出成形品7が
得られる。この実施例では、押出成形品11は車両用ウ
インドモールディングであり、図4の2点鎖線に示すよ
うに軟質合成樹脂部12において屈曲されコーナ部とさ
れる。As described above, the switching valve 8 is repeatedly switched between the first position and the second position, so that the soft synthetic resin portion 12 and the hard synthetic resin portion 13 are alternately continuous in the longitudinal direction. An extruded product 7 as shown in FIG. 4 is obtained by forming a long body having the same length and cutting it into a required length. In this embodiment, the extruded product 11 is a window molding for a vehicle, and is bent at a soft synthetic resin portion 12 to form a corner portion as shown by a two-dot chain line in FIG.
【0015】また、図3に示すように、押出成形品11
の所要位置には伸び防止のための金属性ワイヤ14が押
出成形と同時にインサートされる。前記切替え弁8の切
替動作にともない、成形路5を流れる材料が切替わる。
そして一時期、成形路5には、軟質材料P1と硬質材料
P2とが前後に接して流れる。Further, as shown in FIG.
A metal wire 14 for preventing elongation is inserted at the required position at the same time as the extrusion molding. With the switching operation of the switching valve 8, the material flowing through the molding path 5 is switched.
At one time, the soft material P1 and the hard material P2 flow in the forming path 5 in front and back.
【0016】前記軟質材料P1と硬質材料P2とは、ダ
イ1の成形路5において160℃〜170℃(好ましく
は温度に対する粘度の特性曲線が交差する162℃前
後)の溶融温度に保たれる。このため、軟質材料P1と
硬質材料P2との粘度の差はきわめて小さい。この結
果、成形路5の各材料P1,P2は、その流れが境界部
付近で乱れることなく安定して流れる。したがって、軟
質合成樹脂部12と硬質合成樹脂部13との境界部分に
凹凸の歪みが発生することが可及的に防止され、外観美
麗な押出成形品11が得られる。The soft material P1 and the hard material P2 are maintained at a melting temperature of 160 ° C. to 170 ° C. (preferably around 162 ° C. at which the characteristic curve of viscosity with respect to temperature intersects) in the forming path 5 of the die 1. Therefore, the difference in viscosity between the soft material P1 and the hard material P2 is extremely small. As a result, the materials P1 and P2 of the forming path 5 flow stably without being disturbed near the boundary. Therefore, the occurrence of uneven distortion at the boundary between the soft synthetic resin portion 12 and the hard synthetic resin portion 13 is prevented as much as possible, and the extruded product 11 with a beautiful appearance can be obtained.
【0017】なお、軟質材料P1と硬質材料P2とは前
記実施例のものに限るものではなく、温度に対する粘度
の曲線が特定の温度範囲において交差又は近接する特性
を有する軟質材料と硬質材料の中から適宜に選定すれば
よい。The soft material P1 and the hard material P2 are not limited to those in the above-described embodiment, but may be any one of the soft material and the hard material having a characteristic that the curve of the viscosity with respect to temperature crosses or approaches in a specific temperature range. May be selected as appropriate.
【0018】[0018]
【発明の効果】以上述べたように、この発明によれば、
押出成形用ダイの成形路に交互に給送される熱可塑性合
成樹脂よりなる軟質材料と硬質材料との切り替え時にお
ける材料流れを安定化することができ、軟質合成樹脂部
と硬質合成樹脂部との境界部分に凹凸の歪みが生じると
ことを防止できるため、軟質合成樹脂部と硬質合成樹脂
部とを長手方向に交互に連続して有する押出成形品を外
観美麗に製造することができる。As described above, according to the present invention,
The material flow at the time of switching between a soft material and a hard material made of a thermoplastic synthetic resin alternately fed to a molding path of an extrusion die can be stabilized, and a soft synthetic resin portion and a hard synthetic resin portion can be formed. This can prevent the occurrence of uneven distortion at the boundary portion of, so that an extruded product having a soft synthetic resin portion and a hard synthetic resin portion alternately and continuously in the longitudinal direction can be manufactured with beautiful appearance.
【図1】この発明の一実施例の押出成形用ダイの切替え
弁が第1切替え位置に配置された状態を示す断面図であ
る。FIG. 1 is a sectional view showing a state in which a switching valve of an extrusion die according to an embodiment of the present invention is disposed at a first switching position.
【図2】同じく切替え弁が第2切替え位置に配置された
状態を示す断面図である。FIG. 2 is a sectional view showing a state in which the switching valve is arranged at a second switching position.
【図3】押出成形品を示す断面図である。FIG. 3 is a sectional view showing an extruded product.
【図4】同じく押出成形品全体を示す説明図である。FIG. 4 is an explanatory view showing the entire extruded product.
【図5】この発明の軟質材料と硬質材料との温度に対す
る粘度の特性曲線を示す説明図である。FIG. 5 is an explanatory diagram showing a characteristic curve of viscosity with respect to temperature of a soft material and a hard material according to the present invention.
【図6】軟質材料が汎用の軟質PVCであり硬質材料が
汎用の硬質PVCであるときの温度に対する粘度の特性
曲線を示す説明図である。FIG. 6 is an explanatory diagram showing a characteristic curve of viscosity with respect to temperature when a soft material is a general-purpose soft PVC and a hard material is a general-purpose hard PVC.
1 ダイ 2 第1材料流路 3 第2材料流路 4 弁室 5 成形路 6 押出口 8 切替え弁 11 押出成形品 12 軟質合成樹脂部 13 硬質合成樹脂部 P1 第1材料 P2 第2材料 Reference Signs List 1 die 2 first material flow path 3 second material flow path 4 valve chamber 5 forming path 6 extrusion port 8 switching valve 11 extruded product 12 soft synthetic resin part 13 hard synthetic resin part P1 first material P2 second material
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7,DB名) B29C 47/10 ──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. 7 , DB name) B29C 47/10
Claims (1)
手方向に交互に連続して有する押出成形品の製造方法で
あって、 温度に対する粘度の曲線が特定の温度範囲において交差
又は近接する特性を有する軟質熱可塑性合成樹脂よりな
る軟質材料と、硬質熱可塑性合成樹脂よりなる硬質材料
とを選定し、 押出成形用ダイの前面に開口する押出口をもつ成形路に
対し、前記軟質材料と硬質材料とを交互に給送し、これ
ら軟質材料と硬質材料とを前記特定の温度範囲に保ちな
がら前記押出口から順次に連続して押出すことで、軟質
合成樹脂部と硬質合成樹脂部とを長手方向に交互に連続
して有する押出成形品を製造することを特徴とする押出
成形品の製造方法。1. A method for producing an extruded product having a soft synthetic resin portion and a hard synthetic resin portion alternately and continuously in a longitudinal direction, wherein a curve of viscosity with respect to temperature intersects or approaches in a specific temperature range. A soft material made of a soft thermoplastic synthetic resin having characteristics and a hard material made of a hard thermoplastic synthetic resin are selected, and the soft material and the soft material are formed in a molding path having an extrusion opening opening on the front surface of an extrusion die. The hard material is alternately fed, and the soft material and the hard material are sequentially and continuously extruded from the extrusion port while maintaining the specific temperature range, so that a soft synthetic resin portion and a hard synthetic resin portion are formed. A method for producing an extruded article, characterized by producing an extruded article having a plurality of extruded products alternately and continuously in the longitudinal direction.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5267335A JP3043555B2 (en) | 1993-10-26 | 1993-10-26 | Extruded product manufacturing method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5267335A JP3043555B2 (en) | 1993-10-26 | 1993-10-26 | Extruded product manufacturing method |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH07117099A JPH07117099A (en) | 1995-05-09 |
JP3043555B2 true JP3043555B2 (en) | 2000-05-22 |
Family
ID=17443395
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5267335A Expired - Lifetime JP3043555B2 (en) | 1993-10-26 | 1993-10-26 | Extruded product manufacturing method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3043555B2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3599886B2 (en) * | 1996-03-08 | 2004-12-08 | 日立粉末冶金株式会社 | Hydrodynamic thrust porous bearing |
CN103347674B (en) * | 2010-12-13 | 2016-07-13 | 乔治·马卡年吉马克公司 | It is used in particular for the extrusion device of plastics |
-
1993
- 1993-10-26 JP JP5267335A patent/JP3043555B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH07117099A (en) | 1995-05-09 |
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