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
Landscapes
- 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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